Abstract:
A drinking water dispenser according to the present invention functions to supply drinking water from a detachable water container. The drinking water dispenser includes a hot water tank, a chilled water tank, a supply pipe and a sterilization system. The hot water tank heats and stores the drinking water supplied from the water container. The supply pipe connects the water container with the hot water tank and the chilled water tank. The sterilization system sterilizes the tanks and the supply pipe by circulating hot water from the hot water tank among them. The dispenser is also sterilized because of its including a special 3 way connector between the detachable container and tanks which allows connector and container to be housed in a refrigerator, thus separating critical system components from warmer outside air and thus suppressing invasion and growth of microbes.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates a dispenser for supplying drinking water, and more particularly to a drinking water dispenser which can always supply hot water and chilled water. Further, it is arranged to enable heat sterilization of storage tanks and a piping system in the dispenser and to suppress the microorganisms invasion of the dispenser. This arrangement improves the degree of safety in disinfection control and maintains natural character of the drinking water supplied from the dispenser. Furthermore, this improves an operational ability such as an installation of the drinking water container and the size of the dispenser. 
     Various types of a dispenser for supplying drinking water have been already marketed. According to the increase of users&#39; interest with respect to drinking water, the demands to ensure safety of drinking water and to pursue the quality in natural character of drinking water have been increased. As to ensuring safety of drinking water, in case of a dispenser for supplying tap water, since the tap water has some sterilization function by means of remained chlorine added in the tap water for disinfection, the growth of the microbe in the tap water is suppressed and therefore the ensuring of the safety is kept. 
     However, in case of drinking water such as natural mineral water, since chlorine for disinfection is not added in the drinking water, it is important to take account of the growth of microbe in the drinking water. The growth of microbe in the drinking water is harmful if the microbe is pathogenicity. Even if the microbe is not pathogenicity, it may apply strange taste and odor to the drinking water or make the drinking water turbid. The growth of microbe in the dispenser is prevented by always continuously supplying the drinking water. However, if the drinking water rested in the dispenser for a long time such as a night or week end in case of use in an office, there is a possibility that microbe grows in the drinking water. Also, the colony of microbe may grow in the dispenser as a result of long term use. 
     Conventionally, in order to suppress the growth of microbe in the dispenser, there have been proposed a lot of dispensers which are arranged to execute sterilization by pouring germicide or high-temperature water from external to a piping system thereof and by circulating it, or dispensers which are arranged to provide a filtering device for removing microbial contaminants therefrom. However, pouring germicide or high-temperature water into the piping system of the dispenser requires providing an apparatus for pouring such germicide in the dispenser and for discharging it after the circulation and a space for pouring and discharging such germicide. Further, the operation thereof is complicated and takes predetermined time. Furthermore, after the use of germicide, it was necessary to wash the germicide out. In case of a filtering apparatus, maintenance of a filter thereof is complicated and there is a problem that the microbe caught by the filtering apparatus may grow and increase colony in the filtering apparatus. 
     Therefore, the inventors of the present invention have proposed a dispenser for supplying drinking water from a previously drinking water packaged container, as disclosed in Japanese Patent Provisional Publication No. 6-48488. The proposed drinking water dispenser comprises a cooling system for cooling a drinking water packaged container and a tank for storing drinking water in a piping system and a sterilization system for executing heat sterilization of the piping system by means of a heater used heating device or hot water flowing device. Such a heat sterilization system is controlled by an automatic execution device. By the provision of this sterilization system, the drinking water dispenser sterilizes microbe grown in the dispenser, provides a simple and effective sterilization method and supplies safety guaranteed drinking water usually set in hot or chilled condition. 
     However, since this conventional drinking water dispenser is arranged to have a heater in each of a piping system, a cool water tank and a hot water tank, it is necessary to ensure a large space for the heaters and to consume lot of electric power. Accordingly, this invites the increase of the cost for producing the dispenser and of the running cost of the dispenser. Although the heat sterilization method of this conventional drinking water dispenser functions effectively as a sterilization method having sufficient merits, there is a part which is not heated due to the detailed structure of the conventional dispenser. Therefore, the sterilization thereof has been sometimes executed insufficiently. For example, the conventional drinking water dispenser is arranged to connect the portions from the drinking water container to the piping system by means of I-type joints. Although this joint is usually employed to facilitate the arrangement of hoses and to simplify the structure in the dispenser, the hot water does not flow through the I-type joint itself and therefore the I-type joint is not heat sterilized by the hot water. 
     Generally, in case of the contaminating of a small amount of microbe or contaminating of non disease-causing microbe, the safety of the drinking water is ensured by heat sterilizing the microbe contaminated in the dispenser. However, in case of the contaminating of a lot of microbe or contaminating of pathogenic microbe, the safety of the drinking water is degraded by the contaminating of the microbe, and the quality in natural character of the drinking water may be degraded. In order to keep the safety and the quality in the natural character of the drinking water, it is necessary to provide a sterilization means which prevents the contamination of microbe into the dispenser as possible and avoids heating sterilization from being frequently executed. Further, it is necessary to facilitate the maintenance of the dispenser and to prevent the degradation of each part of the dispenser. Furthermore, in case that the dispenser is used as a dispenser for supplying drinking water, more particularly, in case that it is used as a dispenser for supplying drinking water which has a very delicate taste and odor and tends to be affected in natural character like as natural mineral water, it is important to pay attention to a slight addition of the strange taste and odor from parts contacted to the drinking water. Furthermore, the dispenser is required to have a good controllability, to be treated easily and to have a compact appearance which does not require a large space. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide an improved drinking water dispenser which improves the degree of safety in disinfection control by means of heat sterilization and maintains natural character of the drinking water supplied from the dispenser. Further, the improved drinking water dispenser improves an operational ability such as an installation of the drinking water container and the size thereof. 
     A drinking water dispenser according to the present invention functions to supply drinking water from a detachable water container. The drinking water dispenser comprises a hot water tank, a chilled water tank, a supply pipe and a sterilization system. The hot water tank heats and stores the drinking water supplied from the water container. The chilled water tank cools and stores the drinking water supplied from the water container. The supply pipe connects the water container with the hot water tank and the chilled water tank. The sterilization system sterilizes the hot water tank, the chilled water tank and the supply pipe by circulating hot water of the hot water tank among them. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a schematic view showing a structure of a dispenser according to the present invention. 
     FIG. 2 is an exploded view of a piping system of the dispenser of FIG.  1 . 
     FIG. 3A is a front view showing a three-way connector of the dispenser of FIG. 1, 
     FIG. 3B is a top view of the three-way connector, and 
     FIG. 3C is a side view of the three-way connector. 
     FIG. 4 is a partial cross-sectional view of a hose employed in the piping system of the dispenser according to the present invention. 
     FIG. 5A is a side view of a water pouring faucet of the dispenser of FIG. 1, 
     FIG. 5B is a bottom view of the water pouring faucet, and 
     FIG. 5C is a back view of the water pouring faucet. 
     FIG. 6 is a front view of a water server of an embodiment of the dispenser according to the present invention. 
     FIG. 7 is a top view of the water server of FIG.  6 . 
     FIG. 8 is a cross-sectional side view of the water server of FIG.  6 . 
     FIG. 9 is a back view of the water server of the water server of FIG.  6 . 
     FIG. 10 is a cross sectional view taken along the direction of arrows X—X of FIG.  9 . 
     FIG. 11 is an enlarged partial view of FIG.  8 . 
     FIG. 12 is a bottom view of FIG.  11 . 
     FIG. 13A is a perspective view showing a procedure for installing a drinking water container to a dispenser, and 
     FIG. 13B is an enlarged view of a portion XIII of FIG.  13 A. 
     FIG. 14 is a perspective view showing a procedure for installing the drinking water container to the dispenser. 
     FIG. 15 is another perspective view showing a procedure for installing the drinking water container to the dispenser. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to FIGS. 1 to  15 , there is shown an embodiment of a drinking water dispenser according to the present invention. As shown in FIG. 1, a drinking water container  1  such as a bag in box type container (BIB container) is received in a refrigerator  25 . The BIB container  1  supplies drinking water to two kinds of storage tanks such as a hot water tank  3  and a chilled water tank  4  through a supply pipe  2  by means of gravity. A heater  5  installed in the hot water tank  3  heats the drinking water, and a cooler  6  installed in the chilled water tank  4  cools the drinking water. The hot water is poured from a hot water pouring faucet  7  connected to the hot water tank  3 , and the chilled water is poured from a chilled water pouring faucet  8  connected to the chilled water tank  4 . Further, a connecting pipe  11  connects the hot water tank  3  and the chilled water tank  4 . A circulating pump  9  and a circulating solenoid valve  10  are disposed in the connecting pipe  11  as shown in FIG.  1 . Therefore, when the heat sterilization is executed, the hot water pouring faucet  7  and the chilled water pouring faucet  8  are closed, the circulating solenoid valve  10  is opened, and the circulating pump  9  is operated. With these operations, hot water flowed out from the hot water tank  3  circulates in the connecting pipe  11 , the chilled water tank  4  and the supply pipe  2  in the order of mention. During the heat sterilization, the hot water circulated through a heat sterilization circuit in the dispenser is heated by the heater  5  installed in the hot water tank  3  so that the temperature of the hot water is greater than or equal to 70° C. That is, the sterilization of inner portions of the pipes  2 ,  11  is executed by the hot water kept at a temperature necessary for the heat sterilization. As is clear from the above explanation, the hot water tank  3 , the connecting pipe  11 , the circulating pump  9  and the circulating solenoid valve  10  constitute a heat sterilization system. 
     Further attached in the hot tank  3  are a steam purge pipe  12  for purging steam in the hot water tank  3  and a hot water drain valve  13  for draining hot water in the hot water tank  3 . Attached in the chilled water tank  4  is a chilled water drain valve  14 . The dispenser comprises a refrigeration system for cooling the chilled water tank  4  and the refrigerator  25 . The refrigeration system comprises an electric compressor  19  which pressurizes and discharges refrigerant to a condenser  17 . The refrigerant is liquefied in the condenser  17 , and the condenser  17  is cooled by the electric motor fan  18 . The liquefied refrigerant is supplied through a selector electromagnetic solenoid valve  16 , refrigerant supply pipes  15  and  22  to the cooler  6  and an evaporator  23  installed in the refrigerator  25 , respectively. The selector electromagnetic solenoid valve  16  is arranged to control the supply of the refrigerant to the cooler  6  and the evaporator  23  so as to prevent the temperature in the refrigerator  25  or the temperature of the chilled water tank  4  from becoming greater than or equal to a preset value. Refrigerant drain pipes  20  and  21  are connected to the cooler  6  and the evaporator  23  to return the refrigerant to the compressor  19 . 
     The refrigerator  25  comprises the evaporator  23 , a refrigerator fan motor  24 , a door  26 , a partition wall  27  for partitioning an inner space of the refrigerator  25 , and a shelf board  28  for setting the drinking water container. 
     The drinking water contain  1  set in the dispenser according to the present invention is a sealed container which is of a bag in box type container (BIB container). An outlet port  29  connected to an inner bag of the BIB container  1  is connected to the supply pipe  2  in the refrigerator  25 . The outlet port  29  is formed into a neck shaped portion, and a removable seal  29   b  is attached on a top surface the neck shaped portion. A sealing film  29   c  is set at an inner-deep portion of the neck shaped portion. The drinking water was filled the BIB container  1  with in an aseptic condition, and the sealing film  29   c  and the removable seal  29   b  keep the sterility in the BIB container  1 . When the drinking water container  1  is connected to the supply pipe  2  of the dispenser, the removable seal  29   b  is removed. The refrigerator  25  storing the BIB container  1  is cooled by the refrigeration system including the evaporator  23  and the refrigeration fan motor  24  so as to cool the drinking water in the BIB container  1  at about 4 to 10° C. 
     The purpose of this refrigeration system is to set the drinking water at a suitable cold temperature for drinking and to store the drinking water at a microbe suppressed state so as to reduce the possibility of the contamination of the drinking water in the BIB container  1  by microbe. Further, since the connecting portion between the BIB container  1  and the dispenser is put in the refrigerator so as to be separated from outside air and to be put in a cold temperature circumstance, the invasion and the growth of microbe is suppressed. 
     Conventionally, although a connector of the dispenser connects to the BIB container outlet port through a supply hose is attached to the dispenser, this has generated the invasion of microbe during the connecting operation of the drinking water container or the contamination of the connecting portion by microbe. Because the connector of the drinking water container is treated by hands. That is, such a conventional connecting operation is not sanitary. In case that a bottle well-seen in the United State or Europe is used as a bottled drinking water container, a mechanism therefor is arranged to open a plug of an outlet port of the bottle and to insert the outlet port of the inverted bottle to a water supply reservoir installed at an upper portion of the dispenser. However, such a conventional water supply reservoir of the dispenser and the outlet port of the bottle are exposed in outside air, and the connecting portion therebetween is not shut from outside air even under the connected condition. Therefore, in case of such a conventional well-seen bottle, the invasion of and attaching of microbe into the water container and dispenser tend to be generated. 
     Next, the piping system of the dispenser according to the present invention will be explained in detail with reference to FIG.  2 . The supply pipe  2  is arranged such that a pair of hoses  32  and  32  are fixedly connected to a three-way connector  31  by means of clamps  33  and  33 . The three-way connector  31  is inserted to the outlet port  29  of the BIB container  1  and is sealed by an O-ring  30 . Each of the hoses  32  and  32  is fixedly connected to each pipe  34  by means of each clamp  35 . The three-way connector  31  is made of stainless steel and is arranged, as shown in FIGS. 3A to  3 C to have two connecting pipe portions  37  and  37  projected from a main body  36  to both lateral sides. Further, the three-way connector  31  has a T-shaped through hole  38  and a tapered cylindrical portion  39  including a sharp end portion  39   a  for breaking through the sealed film  29   c  of the BIB container outlet port  29 . The three-way connector  31  is disposed in the vicinity of the outlet port  29  such that the heat sterilization by the circulation of the hot water is executed even near an end portion of the dispenser. Since the three-way connector  31  is made of metal, a portion near the outlet port  29  is sterilized due to the heat conductivity of the three-way connector  31 . The O-ring  30  is made of silicone rubber and is disposed in a recess portion of the tapered cylindrical portion  39  of the three-way connector  31  so as to prevent the O-ring  30  from easily moving vertically. Therefore, when the tapered cylindrical portion  39  is connected to the outlet port  29  of the BIB container  1 , the O-ring  30  functions to prevent the leakage of the drinking water at the connecting portion. The hose  32  is made of rubber or synthetic resin such as SEBS, and its inner and outer surfaces are coated by LLDPE coatings  32   a  and  32   b  as shown in FIG. 4 showing a vertical cross sectional structure. The thickness of the coating  32   b  of the outer surface is thinner than the coating  32   a  of the inner surface. The pipes  34  are made of stainless steel. 
     Again, as shown in FIG. 2, the pipes  34  and  34  are fixedly connected to hoses  40  and  40 , respectively, by means of clamps  41 . The hoses  40  and  40  are fixedly connected to pipes  42  and  42  projected from the hot water tank  3  and the chilled water tank  4  by means of clamps  43  and  43 , respectively. The connecting pipe system  11  is arranged to fixedly connect a hose  45  with a T-shaped pipe  44  projected from a bottom portion of the hot water tank  3  by means of a clamp  46 , to fixedly connect a pipe  47  with the hose  45  by means of a clamp  48 , and to fixedly connect a hose  49  with the pipe  47  by means of a clamp  50 . The hose  49  is fixedly connected to an inlet port  51  of the circulating pump  9  by means of a clamp  52 . An outlet port  53  of the circulating pump  9  is fixedly connected to a hose  54  by means of a clamp  55 . Further, the hose  54  is fixedly connected with a pipe  56  by means of a clamp  57 . Furthermore, the pipe  56  is fixedly connected to a hose  58  by means of a clamp  59 , and the hose  58  is fixedly connected to an inlet port  60   a  of the circulating solenoid valve  10  by means of a clamp  61 . The hoses  40 ,  45 ,  49 ,  54  and  58  are made of material as same as that of the hose  32 . The pipes  42 ,  47  and  56  are made of material as same as that of the pipe  34 . The circulating pump  9  is arranged such that a casing and an impeller thereof are made of glass-fiber reinforced PP, a spindle is made of ceramics, a thrust is made of polyethylene, a O-ring is made of fluoro rubber, and a bearing is made of Rulon-alloy. The circulating solenoid valve  10  is constructed such that a body thereof is made of polyacetal, a valve sheet and a packing are made of silicone rubber, a guide and a spring are made of stainless steel, and a plunger is made of stainless steel. 
     An outlet port  60   b  of the circulating solenoid valve  10  is fixedly connected to a hose  62  by means of a clamp  63 . The hose  62  is fixedly connected to a pipe  64  branched from a pipe  66  projected from the chilled water tank  4  by means of a clamp  65 . The chilled water pouring faucet  8  is installed in the vicinity of the piping system so that the heat sterilization thereof is easily executed. The chilled water pouring faucet  8  is connected to the pipe  66  through a packing  67 . The hot water pouring faucet  7 , which is the same as the chilled water pouring faucet  8 , is connected to a pipe  68  projected from the hot water tank  3  through a packing  69 . As shown in FIGS. 5A to  5 C, each of the hot water and chilled water pouring faucets  7  and  8  is arranged such that a connecting pipe portion  78  is integrally connected with a main body  79  to form an L-shape appearance. A cutout portion such as a slit  79   d  is formed at a tip end portion of a water outlet  79   c  of the main body  79 . Therefore, a surface tension of water at the tip end portion of the water outlet  79   c  is suppressed, and the water rested in the vicinity of the water outlet  79   c  tends to be discharged. That is, the water dripping performance of the dispenser according to the present invention is improved. Since the portion in the vicinity of the water outlet  79   c  is exposed in outside air, the resting of water at there extremely tends to cause the invasion and the growth of microbe. Therefore, this cut portion structure is very effective to prevent the invasion and the growth of microbe. 
     A drain pipe  70  is downwardly projected from the bottom portion of the chilled water tank  4 , and a chilled water drain valve  14  is connected to the drain pipe  70 . The hot water drain valve  13  is the same as the chilled water drain valve  14 . The steam purge pipe  12  for the hot water tank  3  is arranged such that a stainless steel pipe  71  projected from the hot water tank  3  is fixedly connected to a hose  72  by means of a clamp  73 , the hose  72  is fixedly connected to a pipe  74  by means of a clamp  75 , and the pipe  74  is fixedly connected to a hose  76  by means of a clamp  77 . The pouring faucets  7  and  8  are made of synthetic resin such as polysulfone, the hot water tank  3  and the chilled water tank  4  are made of stainless steel, the pipes  64  and  66  are the same as the material of the tanks  3  and  4 , the packings  67  and  69  are made of silicone rubber. 
     The drain valves  13  and  14  are made of brass so that the heat sterilization thereof is executed by utilizing the heat conduction of the material when the heat sterilization of the system is executed by circulating hot water. It is important that the material of parts contacting with drinking water in the dispenser is selected on the basis of the functions of the parts to be performed in the dispenser. Further, it is important that the parts are sanitary with respect to drinking water, and do not affect the natural character of drinking water. 
     However, the conventional dispenser has not taken account of the affectation of the selected material to the natural character of drinking water. Therefore, strange odor such as metal-like smell or rubber-like odor and strange taste due to metals have been frequently added to drinking water. More particularly, in case of drinking water having delicate flavor and taste such as natural mineral water, it is necessary to keep its flavor and taste. Therefore, the materials of the hot water tank, the chilled water tank and the pipes of the piping system are selected so as to satisfy the corrosion resistance, the heat conductivity and the aging deterioration durability and not to affect the natural character of drinking water. 
     Accordingly, the dispenser according to the present invention is arranged to use stainless steel therefor. For example, SUS316 and SUS304 (kinds of stainless steel defined by Japanese Industrial Standard) are preferably used in the pipes and tanks of the dispenser according to the present invention. Further, the material of the hoses should be selected so as to satisfy the flexibility, inner-space keeping performance even under a vent condition, high-temperature resistance and low-temperature resistance and to have a low adsorption characteristic with respect to strange taste and odor. Therefore, silicone rubber and SEBS are used as the material of the hoses of the dispenser according to the present invention. In order to suppress the affection to the natural character as possible, it is preferable to use the material coated by LLDPE. As a coating method, it is preferable to the simultaneous extruding method since using of adhesive is not appropriate in view of the safety and affectation to the natural character of drinking water. 
     As to the O-rings, the packings and the valves of the solenoid valves of the dispenser according to the present invention, silicone rubber or fluoro rubber is selected in view of satisfying high-temperature durability and low-temperature durability and having low adsorption characteristic to strange taste and odor material. As to the hot water pouring faucet  7  and the chilled water pouring faucet  8 , polysulfone or PP is selected in view of satisfying high-temperature durability and low-temperature durability, dimensional accuracy and external appearance and having low adsorption characteristic to strange taste and odor material. As to the valve of the water pouring faucet, silicone rubber or fluoro rubber is selected in view of shape recovery performance against deformation, crack resistance and high-temperature durability and low-temperature durability, and having low adsorption characteristic to strange taste and odor material. As to the casing and the impeller of the circulating pump and the body of the circulating electromagnetic solenoid valve, polyacetale, glass fiber reinforced PP or polysulfone is selected in view of satisfying high-temperature durability and low-temperature durability, crack resistance, dimensional accuracy and dimensional stability, and having low adsorption characteristic to strange taste and odor material. As to the three-way connector, stainless steel or polysulfone is selected in view of heat conductivity, high-temperature resistance and low-temperature resistance, dimensional accuracy, sharpness and durability for picking the sealing film of the pour out port of the BIB container and having low adsorption characteristic to strange taste and odor material. In case of stainless steel, it is preferable to select, for example, SUS316 or SUS304. As to the chilled water drain pipe, the hot water drain pipe and the drain pipe, it is preferable to select metal such as heat-conductive stainless steel and brass. 
     FIGS. 6 to  15  show an example of the dispenser according to the present invention, which is assembled into a water server. 
     A longitudinal body  80  has a height of about 140 cm, a front-width of about 35 cm, a length of about 45 cm. The body  80  is arranged to have the door  26  of the refrigerator  25  at its upper portion and to be formed into a sealable box-shape as shown in FIGS. 1 and 8. In the body  80 , an apparatus holding area  81  is disposed under the refrigerator  25 . A panel  82  is installed at a lower portion of the door  26  and a front intermediate portion. The panel  82  includes a hot water optimum temperature lamp  83 , a chilled water optimum temperature lamp  84  and a sanitation lamp  85 . Further, at a lower portion of the panel  82 , a depressed portion  86  is formed. The hot water pouring faucet  7  and the chilled water pouring faucet  8  are disposed at an upper portion of the depressed portion  86 , and a detachable drain pan  87  for setting on a glass is disposed at a lower portion of the depressed portion  86 . 
     As shown in FIG. 8, in the refrigerator  25  the evaporator  23  and an inbox fan motor  24  are fixed to a rear side in the refrigerator  25 . An inboard partition wall  27  is hanged in front of the evaporator  23  and an inbox fan motor  24  surface. A shelf board  28  is horizontally disposed at a lower portion of the partition wall  27 . The drinking water container  1  is disposed on the shelf board  28 . 
     As shown in FIGS. 11 to  15 , the shelf board  28  has a semi-circular cutout portion  98  opened toward the door in order to clamp the neck portion of the drinking water container outlet port  29 . At front side of the cutout portion  98 , triangular taper portions  99 ,  99  are formed so as to connect the front portion of the shelf board  28  and the cutout portion  98 . A pair of finger hock portions  100 ,  100  of a semi-circular cutout portion  98  are disposed at both sides of the taper portion  99  at the shelf board  28 . An end of a fixing lever  101  is rotatably fixed at a lower portion of the taper portion  99  disposed at the shelf board  28  so as to be parallel with the shelf board  28 . When the fixing lever  101  is tightened, the lock state of the drinking water container  1  is established. In order that the drinking water container  1  is set on the shelf board  28 , the lock of the fixing lever  101  is first released. Next, the drinking water container  1  is provisionally set at a front portion of the shelf board  28 , and the neck portion of the drinking water container outlet port  29  is generally adjusted with the taper portion  99 . Then, the drinking water container  1  is moved to the backward of the shelf board  28 . By these operations, the neck portion of the outlet port  29  is accurately led toward the taper portion  99  and is easily engaged with the cutout portion  98 . Therefore, the outlet port  29  is fixed at a position necessary for the connection with the dispenser. Further, by closing the fixing lever  101 , the position of the outlet port  29  of the drinking water container  1  is fixed and the lock state is established. 
     A connecting lever  92  fixedly connecting the three-way connector  31  is disposed at a center and lower portion of the most-length portion of the cutout portion  98  so as to be swingable on a shaft  93  in the vertical direction. The sharp end portion  39   a  is set at the tip end portion of the three-way connector  31 . A grip portion  92   a  of a front end portion of the connecting lever  92  is arranged to be swingable on an axis  95  in the right and left (horizontal) direction. A generally T-shaped guide  102  is disposed around the movable area of the connecting lever  92 . A longitudinal portion of the guide  102  is formed into a generally U-shape opened upward so as to vertically guide the connecting lever  92 . The shaft  93  is disposed at a supporting plate  94  fixed at a back center portion of the lower side of the shelf board  28 . 
     Accordingly, in case that the drinking water container  1  and the dispenser are connected with each other, as shown in FIGS. 13A and 13B, the drinking water container  1  is first put on the shelf board  28 . Next, a groove portion  29   a  formed at the neck portion of the drinking water container  1  is engaged with the taper portions  99 ,  99  by inserting the outlet port  29  of the drinking water container  1  to the cutout portion  98 , and the fixing lever  101  is fastened for locking as shown in FIG.  14 . Then, upon stabilizing the hand by hocking the finger at the finger hock portion  100  of the shelf board  28 , the grip portion  92   a  of the connecting lever  92  is moved upward along the vertical portion of the guide  102  by fingers. By these operations, the sharp end portion  39   a  of the three-way connector  31  is moved upward and is inserted into the inner of the outlet portion  29 . Accordingly, the sealing film  29   c  set in the inner portion of the outlet port  29  is broken by the sharp end portion  39   a,  and the drinking water is flowed from the drinking water container  1  to the three-way connector  31  by means of its gravity. The connecting lever  92  is then set in a folded state by moving the grip portion  92   a  of the connecting lever  92  to one of the right and left directions after the sharp end portion  39   a  breaks the sealing film  29   c  of the inner portion of the outlet port  29 , as shown in FIG.  15 . Since the shaft  93  supporting the connecting lever  92  is fixed at a rear portion in the water dispenser, the fixed point of the shaft  93  is a fulcrum and has a predetermined distance with respect to a power point of the grip portion  92   a  of the connecting lever  92 . Therefore, it is easy to firmly break the sealing film  29   c  of the inner portion of the outlet port  29  by small power with respect to the operating point of the sharp end portion  39   a  of the three-way connector  31 . Further, since the connecting lever  92  may be moved along the guide  102 , the operation thereof is correctly executed. Since the connecting lever  92  is supported by a horizontal portion of the guide  102  by laterally moving the grip portion  92   a  on the axis  95  toward one of right and left sides as shown in FIG. 15 after the breakage of the sealing film  29   c  of the outlet port of the drinking water container  1 , the drop down of the connecting lever  92  is prevented by the guide  102  and is locked without release. Further, since the grip portion  92   a  of the connecting lever  92  is folded into a compact state, it is not necessary to provide a waste space in the refrigerator. 
     In case that the connection between the drinking water container  1  and the dispenser is released, the grip portion  92   a  of the connecting lever  92  is inversely moved in the lateral direction and the connecting lever  92  is moved downward upon being adjusted with the longitudinal portion of the guide  102 . By these operations, the connection between the drinking water container  1  and the dispenser is released. 
     As shown in FIGS. 8 to  10 , the hot water tank  3  and the chilled water tank  4  are disposed on a diagonal line in the apparatus holding area  81  under the refrigerator  25  while the circulating solenoid valve  10  is disposed thereon. The circulating pump  9  is disposed in the vicinity of the hot water tank  3  and the chilled water tank  4 . Since the voluminous hot water tank  3  and chilled water tank  4  are diagonally disposed, the drinking water dispenser is designed compactly and the piping system thereof is arranged compactly. An electric equipment box  103  is disposed under the hot water tank  3  and the chilled water tank  4 , and a sanitation timer  96  is disposed in front of the electric equipment box  103 . The sanitation timer  96  controls the circulating solenoid valve  10  into an open state and the circulating pump  9  into an operating state at predetermined time intervals. In the electric equipment box  103 , there is provided an electric circuit for returning the circulating solenoid valve  10  and the circulating pump  9  into an original state by turning off all of them when a time period necessary for executing the heat sterilization has elapsed. The hot water drain valve  13  is disposed at a side portion of the electrical equipment box  103 . The condenser  17  and the condenser electric motor fan  18  are disposed at a front side under the electric equipment box  103  and the hot water drain valve  13 . The electric compressor  19  is disposed at a most-length portion under the electric equipment box  103  and the hot water drain valve  13 . In order to operate the hot water drain valve  13  and the sanitation timer  96 , a cover  97  is detachably installed at a lower surface of the equipment. Further, a surface of the door  26  is arranged so as to freely display the quality and the manufacturer of the drinking water in the drinking water container  1  thereon. 
     By installing this arranged water server at an office or dining room and by turning on it, the inside of the refrigerator  25  is properly cooled by means of the evaporator  23  to enable the drinking water in the container  1  to be safely stored so as to suppress the increase of the microbe. Further, the drinking water W in the piping system flows in the direction shown by white allows in FIG. 1 to supply the suitably temperature-controlled water. The drinking water W flowing into the hot water tank  3  is heated by the heater  5 , and the drinking water W flowing into the chilled water tank  4  is further cooled by the cooler  6 . When the hot water optimum temperature lamp  83  and the chilled water optimum temperature lamp  84  of the panel  82  are turned on, the optimum hot water is poured out by pressing down the lever of the hot water pouring faucet  7 , and the optimum chilled water is poured out by pressing down the lever of the chilled water pouring faucet  8 . 
     By setting the sanitation timer  96  so that the heat sterilization of the piping system including the hot water tank  3  and the chilled water tank  4  is automatically executed at predetermined time intervals, when the set time elapsed, the sanitation lamp  85  of the panel  82  is flushed and the hot water optimum temperature lamp  83  and the chilled water optimum temperature lamp  84  are turned off. Further, the normally closed circulating solenoid valve  10  is opened and the circulating pump  9  is operated. Therefore, the water in the piping system flows in the direction indicated by black allows as shown in FIG.  1 . The drinking water W heated in the hot water tank  3  is flowed into the chilled water tank  4  through the connecting pipe  11  and is flowed in the supply pipe  2 . Then, the drinking water W is returned to the hot water tank  3 . During the heat sterilization, the temperature of the drinking water W in the hot water tank  3  is set to be higher than or equal to 70° C. Therefore, the microbe contaminated into the supply pipe  2 , the tanks  3  and  4  are all sterilized by the circulating hot water kept at high temperature. Further, by utilizing the heat conductivity of the metal of the parts when the hot water is circulated, the end portion of the system is also sterilized. When the preset time elapsed, the circulating solenoid valve  10  is closed and the circulating pump  9  is stopped. Further, the setting of the temperature of the heater  5  of the hot water tank is returned to the normal setting. With these operations, the heat sterilization is automatically terminated. 
     EXAMPLE 
     A dispenser (A) according to the present invention shown in FIGS. 1 to  15  was produced. As a reference, a dispensers (B), (C) and (D) were produced. The dispenser (B) was the same as the dispenser (A) except that the three-way connector  31  disposed in the vicinity of the connecting portion between the dispenser and the outlet port of the drinking water container was made of plastic. The dispenser (C) was the same as the dispenser (A) except that the three-way connector was connected to the piping system instead of the stainless steel I-shape joint including a sharp cylindrical portion which is employed in the conventional dispenser and that the I-shaped connector is located in the refrigerator. The dispenser (D) was the same as the dispenser (A) except that a conventional valve having no cutout portion is employed as the chilled water pouring faucet  8 . 
     Each dispenser (A), (B), (C), (D) was arranged such that the temperature of the drinking water in the container  1  set in the refrigerator  25  was lower than 10° C., the temperature of the chilled water was set in a range from 4° C. to 10° C., and the temperature of the hot water was set in a range from 80° C. to 90° C. The effective content volume of each of the hot water tank  3  and the chilled water tank  4  was 2.7 litter. The heater installed in the hot water tank was 401 W. 
     Experiment I: Evaluation of Heat Sterilization Performance of Dispensers 
     By using  Spingomonas paucimobilis  (ATCC29837) and  Psudomonas fluorescens  Migula (ATCC13525) which are known as aquatic microbe, the growth of such microbe in mineral water was certified. After these microorganism were incubated in standard agar media at 27° C. for five days, one platinum loop of each incubated microorganism was suspended in 10 ml of mineral water. Further, each suspension was diluted by the mineral water to the concentration of about 10 2  CFU/ml, and each diluted specimen was incubated at 27° C. for five days. After the incubation, each incubated fluid was suspended with 10 litters of mineral water wherein a marketed new BIB container and incubated at 25° C. for 48 hours to obtain two kind of microorganism mineral water. The concentration of the microorganism mineral water including  Spingomonas paucimobilis  was 1.76×10 5  CFU/ml, and the concentration of the microorganism mineral water including  Psudomonas fluorescens  Migula was 3.04×10 6  CFU/ml. 
     By using the two kinds of microorganism mineral water, the following experiment of the dispenser (A) according to the present invention was executed. After 70%-ethanol aqueous solution was circulated in the dispenser (A) for five minutes, a marketed new BIB container  1  in which 10 litters of mineral water is filled, was connected to the dispenser. The mineral water was circulated in the dispenser (A) while being poured out to discharge the ethanol aqueous solution in the dispenser. Then, the drain valves  13  and  14  were opened to drain all of the mineral water in the dispenser. Under this condition, a BIB container filled with the microorganism mineral water was connected to the dispenser. After it was confirmed that the chilled water tank was filled with the microorganism mineral water, 200 ml of the microorganism chilled water was poured through the chilled water pouring faucet  8  and was treated as a specimen I. At this time, since the dispenser is filled with only the microorganism mineral water from the BIB container  1  of the microorganism mineral water and since the water was poured from the chilled water pouring faucet  8 , the microorganism mineral water reached all of the dispenser, that is, reached at an end of the pouring faucet. 
     Next, the BIB container  1  of the microorganism mineral water was detached from the dispenser, and a marketed new BIB container filled with 10 litters of mineral water was connected to the dispenser. Then, the heat sterilization apparatus of the dispenser was operated. The heat sterilization apparatus of the dispenser was set such that a heater  5  set in a hot water tank  3  stops heating when the temperature of hot water in the hot water tank is greater than or equal to 70° C., and that a circulating pump is operated for 60 minutes. During this period, the tanks  3  and  4  and the piping system of the dispenser was filled with the microorganism mineral water of the BIB container  1  previously connected to the dispenser. 
     Just after the heat sterilization, 200 ml of the water corresponding to a cup of water was obtained through the chilled water pouring faucet  8  and was treated as a specimen II. After 2 hours elapsed from the heat sterilization, 200 ml of the water corresponding to a cup of water was obtained through the chilled water pouring faucet  8  and was treated as a specimen III. Following this, in order to pour more than half of the volume of the chilled water tank  4 , 1500 ml of the chilled water was poured and was treated as a specimen IV. 
     As to each specimen, the microbe test was carried out. The microbe test was executed such that 0.1 ml of the specimen was diluted into 1 to 100 times. The diluted specimen was spread on a standard agar media and was incubated at 27° C. for 7 days. A colony count of the incubated specimen was measured. The result thereof is shown in Table 1. 
     
       
         
               
               
               
             
               
               
               
               
             
           
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                   
                 Microorganism 
               
               
                   
                 Microorganism 
                 mineral water 
               
               
                   
                 mineral water 
                 including 
               
               
                   
                 including 
                 Psudomonas 
               
               
                   
                 Spingomonas 
                 fluorescens 
               
               
                   
                 paucimobilis 
                 Migula 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Microorganism 
                 1.76 × 10 5  CFU/ml 
                 3.04 × 10 6  CFU/ml 
               
               
                   
                 mineral water 
               
               
                   
                 SPECIMEN I 
                 1.46 × 10 3  CFU/ml 
                 3.81 × 10 4  CFU/ml 
               
               
                   
                 (microorganism 
               
               
                   
                 water installed 
               
               
                   
                 time) 
               
               
                   
                 SPECIMEN II 
                 10 CFU/ml or less 
                 10 CFU/ml or less 
               
               
                   
                 (just after heat 
               
               
                   
                 sterilization) 
               
               
                   
                 SPECIMEN III 
                 10 CFU/ml or less 
                  5 CFU/ml 
               
               
                   
                 (2 hours later from 
               
               
                   
                 sterilization; 
               
               
                   
                 200 ml) 
               
               
                   
                 SPECIMEN IV 
                 75 CFU/ml 
                 75 CFU/ml 
               
               
                   
                 (2 hours later from 
               
               
                   
                 sterilization; 
               
               
                   
                 1500 ml) 
               
               
                   
                   
               
             
          
         
       
     
     Consequently, it was proved that the dispenser of the present invention sufficiently performed sterilization by operating the heat sterilization apparatus even if microbes grow in the dispenser. 
     Experiment II: Confirmation of Heating Effect by Heat Sterilization of Parts of Dispensers 
     By using the dispenser (A) of the present invention and the dispensers (B) and (C) produced as a reference, the heating effect by the heat sterilization of each part in the dispenser was confirmed by the following experiment. As a scale of the heat sterilization, it was assumed that the temperature thereof was kept at 55° C. for more than 5 minutes. 
     At 35° C. room temperature, a marketed new BIB container  1  filled with 10 litters of mineral water was connected to the dispenser. Then, one hour later the experiment was started. At this time, the temperature of the drinking water in the BIB container  1  set in the refrigerator  25  in the dispenser was 14° C. 
     The heat sterilization apparatus of each dispenser was set to stop the heating when the temperature of hot water in the hot water tank  3  is higher than 70° C. by means of the heating of the heater  5 . The circulating pump  9  was set to operate for 70 minutes. During a period from the start of the circulating pump  9  to 90 minutes later, the temperature of each portion of the dispenser was measured to observe the time elapsed change. During this period, in the dispenser (A), a base part A of the tapered cylinder portion  39  of the three-way connector  31 , a body center part  b  of the three-way connector  31  and a pipe part c of the piping system in refrigerator connected to the hot water tank  3  were measured. In the dispenser (B), a base part a′ of the tapered cylinder portion  39  of the three-way connector  31 , a body center part b′ of the three-way connector  31  and a pipe part c′ of the piping system in refrigerator connected to the hot water tank were measured. In the dispenser (C), a part d of the I-connector located near the outlet port of the drinking water container  1 , a center part e of the I type connector, a part f of the I-connector near the piping system, and a connecting portion part g between the I-connector and the piping system were measured. 
     At the body center part b, b′ of the three-way connector  31  and the pipe c, c′ of the piping system in refrigerator connected to the hot water tank  3  of each of the dispensers (A) and (B), the temperatures were raised from the start of the circulating pump and were reached at 55° C. in 17 minutes. Further, the temperatures were raised and reached maximum 75° C., and were then lowered from the time when the heater attached to the hot water tank was turned off. At the time when 90 minutes elapsed from the start of the heater, the temperature was 63° C. At the tapered cylindrical portion base part  a  of the three-way connector  31  of the dispenser (A) according to the present invention, the temperature was raised from the start of the circulating pump and was reached 55° C. in 33 minutes. Further, the temperatures were raised and reached maximum 65° C., and were then lowered from the time when the heater  5  was turned off. At the time when 90 minutes elapsed from the start of the heater  5 , the temperature was 57° C. At the tapered cylindrical portion base part a′ of the plastic three-way connector  31  of the dispenser (B), the temperature was deviated within a range from 28° C. to maximum 52° C. 
     As to the dispenser (C), at the connecting part g between the I-connector and the piping system, the temperature was raised from the start of the circulating pump  9  and was reached 55° C. in 22 minutes. Further, the temperatures was raised and reached maximum 74° C., and was then lowered from the time when the heater  5  was turned off. At the time when 90 minutes elapsed from the start of the heater  5 , the temperature was 61° C. At the part d of the I-connector near the outlet port of the drinking water container  1 , the temperature was raised from 26 minutes later of the start of the circulating pump and reached maximum 45° C. The temperature was then lowered from the time when the heater  5  was turned off. At the time when 90 minutes elapsed from the start of the heater  5 , the temperature was 26° C. At the center part e of the I-connector, the temperature was raised from the time 26 minutes elapsed from the start of the circulating pump  9  and reached maximum 45° C. The temperature was then lowered from the time when the heater  5  was turned off. At the time when 90 minutes elapsed from the start of the heater  5 , the temperature was 26° C. At the part f of the I-connector near the piping system, the temperature was raised from the time 8 minutes elapsed from the start of the circulating pump  9  and reached maximum 57° C. The temperature more than 55° C. was kept for 4 minutes. The temperature was then lowered from the time when the heater  5  was turned off. At the time when 90 minutes elapsed from the start of the heater  5 , the temperature was 45° C. 
     As a result, in case that it was defined that the sterilization enabling temperature and the period thereof to be followed were 55° C. or more and at least 5 minutes, regarding the dispenser (A) according to the present invention, all of the tapered cylindrical portion base part  a  of the three-way connector  31 , the body center part  b  of the three-way connector  31  and the pipe  c  of the piping system in refrigerator achieved the sterilization condition to keep 55° C. or more for at least 5 minutes. 
     In the dispenser (B), only the tapered cylindrical portion base part a′ of the plastic three-way connector  31  did not reach the temperature greater than 55° C., and therefore the sterilization effect was not ensured. 
     In the dispenser (A), since the three-way connector  31  was made of metal, the temperature thereof was raised by the circulation of hot water and the end portion of the three-way connector was raised by the heat conductivity thereof. Therefore, it was deemed that the temperature of the sharp cylindrical portion base part  a  of the three-way connector  31  was raised at 55° C. or more and kept at the same for 5 minutes or more than. However, it was deemed that at the taper cylindrical portion base part a′ of the plastic three-way connector  31  of the dispenser (B), the temperature thereof was almost not raised and is largely affected by the temperature of the chilled drinking water from the BIB container  1 , and therefore the temperature was not raised. 
     In the dispenser (C), since no part of the I-connector was kept at 55° C. or more for 5 minutes or more, the heat sterilization effect could not be ensured. The reason for this was deemed that the hot water was not circulated in the I-connector and the chilled water from the BIB container  1  was flowed in the I-connector, and the I-connector was disposed in the refrigerator  25  to keep the drinking water under the cooled condition. Therefore, even if the I-connector received the heat of the hot water circulated in the vicinity of the I-connector and utilized its heat conductivity, the temperature of the I-connector was not raised. The I-connector is located at a most upstream portion in the dispenser. Therefore, if the contamination or growth of microbe is generated at this part, whole of the dispenser is contaminated according to the use of the dispenser. That is, the I-connector is the most important part in sterilization. 
     Additionally, in the dispenser (A) according to the present invention, at the chilled water pouring faucet  8  base part, the circulating solenoid valve  10 , the circulating pump  9 , the hot water tank bottom portion, the chilled water tank bottom portion and the chilled water drain valve  14  connected to the chilled water tank through the drain pipe, the temperatures thereof were measured. Each temperature was raised from the start of the circulating pump and was kept at 55° C. or most for at least 30 minutes. Furthermore, in the dispenser (A) according to the present invention, the temperature of the drinking water in the BIB container  1  set in the refrigerator  25  and the temperature in the refrigerator  25  were measured. The temperatures of the drinking water in the BIB container  1  and the temperature in the refrigerator  25  were raised by at most 5 20   C. but were not significantly changed. Accordingly, the inside of the refrigerator  25  and the drinking water in the BIB container  1  set in the refrigerator  25  are kept cool. That is, it is not necessary to excessively execute the cooling after the heat sterilization, and the low temperature for suppressing the growth of microbe in the drinking water in the BIB container  1  is maintained. 
     Experiment III: Effect of the Cutout Portion of the Water Outlet Portion of the Chilled Water Pouring Faucet 
     As to a microbe contamination of two portions of the water outlet tip end portion of the chilled water pouring faucet  8  and the water outlet tip end portion of the hot water pouring faucet  7  which are parts exposed to outside air, a marketed dispenser set in a room of an office was observed. The observation method was as follows: First, the water outlet tip end portions were wiped by a cotton swab wetted by aseptic water. The wiped cotton swab was washed by 1.0 ml aseptic water in a test tube. 0.1 ml of the washing water is mixed with and diluted by medium. Then, the washing water medium was incubated, and the colony count of the incubated specimen was counted. As a result of the observation, at the water outlet tip end portion of the chilled water pouring faucet  8  of the dispenser, 10 3  CFU/ml or more of microbe was detected, and at the water outlet tip end portion of the hot water pouring faucet  7 , 10 CFU/ml or less of microbe was detected. Microbe detected at the water outlet tip end portion and observation of remaining water in the water outlet tip end portion, it concluded that the microbe was attached to the water outlet from outside and the attached microbe was grown in the remaining water in the water outlet tip end portion. Therefore, in order to certify the effect for suppressing the growth of microbe at the chilled water pouring faucet  8 , the following experiment was executed by using the dispenser (D) which was produced as a reference of the dispenser (A) of the present invention. As mentioned above, the chilled water pouring faucet  8  of the dispenser (D) did not have a cutout portion. 
     Strains of  Spingomonas paucimobilis  (ATCC29837) and  Psudomonas fluorescens  Migula (ATCC13525), which were used in the above experiment I, were incubated in standard agar media at 27° C. for five days. Then, one platinum loop of each incubated microorganism was suspended in 10 ml of mineral water. Further, each suspension was diluted by mineral water to the concentration of about 10 2  CFU/ml, and each diluted specimen was incubated at 27° C. for five days. After the incubation, each incubated fluid was suspended with 10 litters of mineral water wherein a marketed new BIB container  1  and incubated at 25° C. for 48 hours to obtain two kinds of microorganism mineral water. The concentration of the microbe was 2.40×10 5  CFU/ml. 
     After the dispenser was put in full empty condition where all drinking water was discharged, the BIB container  1  filled with the microorganism mineral water was connected to the dispenser. After it was checked that the chilled water tank was fully filled with the microorganism water, 500 ml of the water was poured from the chilled water pouring faucet. At this time, since only the microorganism mineral water from the BIB container  1  filled with the microorganism mineral water was existed in the dispenser, the microorganism mineral water reached whole of the dispenser by pouring the water through the chilled water pouring faucet  8 . This means that the water fully reached the end of the pouring faucet  7 ,  8 . Thereafter, the BIB container  1  of the microorganism mineral water was detached from the dispenser, and a marketed new BIB container  1  filled with 10 litters of mineral water was connected to the dispenser. Then, the heat sterilization apparatus was operated. The heat sterilization apparatus of the dispenser was set such that the heater  5  set in the hot water tank  3  stops heating when the temperature of hot water in the hot water tank  3  is greater than or equal to 70° C., and that a circulating pump  9  is operated for 120 minutes. During this period, the tanks and the piping system of the dispenser were filled with the microorganism mineral water of the BIB container  1  previously connected to the dispenser. 
     After the heat sterilization, the dispenser was left for one day without being used so as to maintain a condition that the mineral water was still stayed in the dispenser. After such one day leaving of the dispenser, the water was poured from the chilled water pouring faucet  8  by 1 litter. First 10 ml and last 10 ml of each 1 litter of the water were sampled and tested as to microbe. Further, 10 days later, a marketed new BIB container filled with 10 litters of mineral water was connected to the dispenser. Then, the water was similarly sampled and tested as to microbe. This observation was executed to confirm the periodical change of the count of microbe according to the stayed time of the mineral water in the dispenser after the heat sterilization. The first 10 ml of the poured 1 litter was a sample including water remained in the water outlet tip end portion of the chilled water pouring faucet  8 , and the last 10 ml thereof was a sample including mineral water in the tank which is free from the water remained at the water outlet tip end portion. 
     After the one day leaving of the dispenser, the heat sterilization apparatus of the dispenser was not operated. The microbe test was executed such that 0.1 ml of each specimen was smeared on a standard agar media and incubated at 23° C. for 7 days, and that the colony count thereof was counted. 
     As a result, in the dispenser (D), the microbe of the first 10 ml on the first day was 1.68×10 6  CFU/ml, and the microbe of the last 10 ml on the first day was 9.52×10 3  CFU/ml. In the dispenser (A), the microbe of the first 10 ml on the first day was 220 CFU/ml, and the microbe of the last 10 ml on the first day was 11 CFU/ml. Then, in the dispenser (D), the microbe of the first 10 ml on the second day was 2.20×10 5  CFU/ml, and the microbe of the last 10 ml on the second day was 1.15×10 3  CFU/ml. The microbe of the first 10 ml on the third day was 2.18×10 5  CFU/ml, and the microbe of the last 10 ml on the third day was 1.06×10 3  CFU/ml. The microbe of the first 10 ml on the fourth day was 1.17×10 4  CFU/ml, and the microbe of the last 10 ml on the fourth day was 556 CFU/ml. During a period from the fifth day to the twentieth day, the detected count of microbe was similar to that of the fourth day. 
     In the dispenser (A) of the present invention, although during a period from the second day to the fifth day the count of microbe was detected as was similar to that of the first day, after the fifth day the microbe in both of the first 10 ml and the last 10 ml was within a range from 0 to at most 14. 
     As mentioned above, since the dispenser (A) according to the present invention has been arranged such that the cutout portion is set at the water outlet tip end portion of the chilled water pouring faucet  8 , the drinking water is prevented from remaining at the water outlet portion of the chilled water pouring faucet  8 . As a result, the growth of microbe at this part was prevented. It was deemed that the microbe attached to the water outlet portion and grew in the remaining water in case that the water outlet portion of the chilled water pouring faucet  8  was not sufficiently heated during the heat sterilization. The reason why microbe was not detected at the water outlet tip end portion of the hot water pouring faucet was that since the temperature of the hot water poured from the hot water pouring faucet was kept at 55° C., even if microbe was attached to the water outlet tip end portion of the hot water pouring faucet, the portion was always put in the heat sterilization condition due to the pouring of the hot water. Therefore, microbe died and did not grow. 
     According to the present invention as mentioned above, the heat sterilization apparatus, that is, the heater  5  has been arranged only at the hot water tank  3 , and the provision of the heater to the part of the piping system and the chilled water tank was facilitated. Therefore, the number of the installed portions of the heater was decreased and the consumed electric power was decreased. Accordingly, the production cost of the equipment and the running cost of the dispenser were decreased. 
     Further, since the three-way connector has been disposed in the vicinity of the connecting portion to the outlet port of the drinking water container  1  and the chilled water pouring faucet  8  has been disposed in the vicinity of the piping system, the heat sterilization by circulating hot water was effectively executed as to the whole of the dispenser. Furthermore, since the three-way connector  31  and the drain valves  13  and  14  have been made of metal having high heat conductivity, it becomes possible to heat a circumferential portion of these parts. The parts connected to drinking water in the dispenser, which are located at a nearer portion to the connecting portion as compared with the three-way connector  31  which was not directly sterilized by circulating hot water, were set in the refrigerator  25  under the sealed state and put in the low temperature atmosphere. Therefore, they have been put in a condition that the growth of microbe was difficult. Further, it is arranged that the drinking water container  1  is received in the refrigerator  25 . By this arrangement of the dispenser and the heat sterilization by circulating hot water, the safety of drinking water in the dispenser with respect to microbe is strictly ensured. Even when the drinking water container  1  is attached and detached to and from the dispenser, the portions in contact with the drinking water are not usually touched by men and therefore there is almost not the possibility of the invasion of microbe. 
     Further, since the taper portion  99 , the cutout portion  98 , the guide portion  102  and the connecting lever  92  are provided, the operation of attaching and detaching the drinking water container  1  is easily and firmly executed by small force and the drinking water container  1  is never detached in occupied condition. Further, since the connecting lever  92  is folded in a normal condition except for the attaching and detaching operation, it is compactly received and effective in space. 
     Even if drinking water having delicate natural character such as natural mineral water is employed in the dispenser according to the present invention, the parts in contact with the drinking water in the dispenser does not apply strange taste and odor to the drinking water. Further, since the material which prevents strange taste and odor from being applied to the parts, is selected and used, the dispenser according to the present invention never degrades the delicate taste and never adds strange taste and odor to the water even if it is continuously used for long period. 
     Furthermore, Since the drinking water container  1  having a large volume is received in an upper portion of the dispenser and the hot water tank  7  and the chilled water tank  8  are diagonally arranged at the lower portion, it becomes possible to produce the apparatus of the dispenser compactly. 
     The entire disclosure of Japanese Patent Application No. 9-358667 filed on Dec. 26, 1997 including specification, claims, drawings and summary are incorporated herein by reference in its entirety.