Patent Publication Number: US-9897374-B2

Title: Cold water tank

Description:
TECHNICAL FIELD 
     The present invention relates to a cold water tank capable of cooling water while maintaining an inflow pressure thereof. 
     BACKGROUND ART 
     A cold water tank is a device for cooling water introduced thereinto and allowing cold water to flow therefrom. 
     The cold water tank may be provided in a water purifier, or the like, and water filtered through a plurality of water purifying filters provided in the water purifier is introduced into the cold water tank so as to be cooled. A certain amount of time is required for the water introduced into the cold water tank to be cooled. Also, in order for the water to be easily cooled in the cold water tank, the water must be in a stable state. 
     However, in the case of a water output when water is discharged from the cold water tank, if the pressure of water introduced into the cold water tank is high, the speed of water introduced into the cold water tank may be fast due to water inflow pressure, potentially shortening a period of time during which water remains in the cold water tank, resulting in water introduced into the cold water tank flowing out without being properly cooled. Also, water quickly introduced into the cold water tank may be mixed with water which has been cooled and stored in the cold water tank, raising the temperature of the cooled water. In particular, the temperature of the water at an outlet side of the cold water tank increases, failing to provide cold water having a desired temperature. 
     Meanwhile, in order for the water to remain in the cold water tank for a certain period of time so as to be properly cooled, or in order for the water to be in a stable state in the cold water tank, the cold water tank is positioned under a water supply source which is connected to the cold water tank to supply water to the cold water tank. For example, in the case of a direct water type water purifier having a relatively high water pressure, the cold water tank is positioned to be under a water purifying filter that filters water. Accordingly, water is supplied from the water supply source to the cold water tank according to the difference in height between the water supply source and the cold water tank, rather than the water inflow pressure, and in this case, although water is supplied at high pressure from the water supply source to the cold water tank, the pressure of water in the cold water tank is lowered to about an atmospheric pressure. 
     Thus, a faucet or a cock, connected to the cold water tank to allow water from the cold water tank to flow to the outside, is required to be positioned below the cold water tank to allow water in the cold water tank to be discharged so as to be supplied to a user. 
     Namely, although water is supplied at a high pressure to the water supply source, e.g., the direct water type water purifier, before the cold water tank, as mentioned above, since the water is supplied according to the difference in height between the water supply source and the cold water tank, rather than the inflow pressure of water, the inflow pressure of water may not be properly maintained. 
     In addition, since the faucet, the cock, or the like, is required to be positioned at the lower side of the water tank, the degree of freedom in determining the height of the faucet, the cock, or the like, is low. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     An aspect of the present invention provides a cold water tank allowing water, although being introduced at high pressure, to remain therein for a period of time sufficient to be cooled. 
     Another aspect of the present invention provides a cold water tank allowing water, although being introduced at high pressure, to be in a stable state so as to be cooled therein. 
     Another aspect of the present invention provides a cold water tank allowing water to be cooled with its inflow pressure maintained. 
     Another aspect of the present invention provides a cold water tank including a faucet or a cock, allowing cold water to flow out therethrough, the height of which may be freely determined. 
     Solution to Problem 
     According to an aspect of the present invention, there is provided a cold water tank including: a first tank having an inlet pipe through which water to be cooled is introduced; and a second tank provided in the interior of the first tank such that water of the first tank can be introduced thereinto, having an evaporator included in a refrigerating cycle to cool the introduced water, and having an outlet pipe through which cooled water flows out. 
     The inlet pipe may be provided in a lower portion of the first tank to allow water to be cooled to be introduced from the lower portion of the first tank and flow upward, an inlet hole may be formed at an upper portion of the second tank to allow the water in the first tank to be introduced to the upper portion of the second tank and flow downward in the second tank, and the outlet pipe may be provided in the lower portion of the second tank to allow cooled water to flow out from the lower portion of the second tank. 
     An air flow pipe having a check valve may be formed at an upper portion of the first tank to allow air included in the interior of the first tank or the second tank to be discharged to the outside. 
     The second tank may include a temperature sensor. 
     The outlet pipe may penetrate through the first tank so as to be connected to the second tank. 
     One end portion of the outlet pipe may be positioned at a lower portion of the second tank to allow cooled water to flow out from the lower portion of the second tank. 
     An air hole may be formed in the outlet pipe to allow air included in the interior of the first tank or the second tank to be discharged to the outside. 
     A flow guide may be provided in a portion of the second tank adjacent to the inlet hole to allow water to be rotatably introduced into the second tank through the inlet hole. 
     The second tank may include an ice size sensor for sensing the size of ice generated at the evaporator. 
     Advantageous Effects of Invention 
     According to exemplary embodiments of the invention, although water is introduced at high pressure, the introduced water can remain in the cold water tank for a period of time required for being cooled. 
     In addition, although water is introduced at high pressure, the introduced water can be in a stable state in the cold water tank. 
     Also, water can be cooled with its inflow pressure maintained. 
     Moreover, the degree of freedom of a faucet or a cock for allowing cold water to flow therethrough can be improved in its height. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an exploded perspective view of a cold water tank according to an exemplary embodiment of the present invention; 
         FIG. 2  is a sectional view of a cold water tank according to an exemplary embodiment of the present invention; 
         FIG. 3  is a sectional view of a cold water tank according to another exemplary embodiment of the present invention; 
         FIG. 4  is a rear view of a second tank cover according to another exemplary embodiment of the present invention; and 
         FIG. 5  is a view showing an operation of the cold water tank according to an exemplary embodiment of the present invention. 
     
    
    
     MODE FOR THE INVENTION 
     Hereinafter, exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the shapes and dimensions may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or like components. 
     Exemplary embodiments of the present invention include a first tank into which water to be cooled is introduced, with an inflow pressure of water maintained, and a second tank provided in the interior of the first tank, connected to the first tank, having an evaporator to allow introduced water to be cooled, and allowing water to flow out therefrom. 
     As shown in  FIGS. 1 to 3 , a cold water tank  100  according to an exemplary embodiment of the present invention may include a first tank  200  and a second tank  300 . 
     Water to be cooled may be introduced into the first tank  200 . To this end, as shown in  FIGS. 1 to 3 , an inlet pipe  210  may be connected to the first tank  200 . The inlet pipe  210  may be connected to a water supply source (not shown) such as a water purifying tank (not shown) in which water filtered by a plurality of water purifying filters is stored. Accordingly, water to be cooled may flow into the first tank  200  through the inlet pipe  210 . The inlet pipe  210  may be provided in a lower portion of the first tank  200 . Thus, water to be cooled may be introduced into the lower portion of the first tank  200  through the inlet pipe  210 . Upon being introduced into the lower portion of the first tank  200 , water to be cooled, filling the first tank  200 , moves (or flows) upward. In the illustrated exemplary embodiment, water to be cooled, introduced through the inlet pipe  210 , may move in a spiral manner from the lower portion to an upper portion of the first tank  200 . Accordingly, the flow speed of water to be cooled is lowered toward the upper portion of the first tank  200 , stabilizing the water flow. Also, the pressure of water when water is introduced can be maintained as it is. That is, the water introduced into the first tank  200  flows from the lower side to the upper side, with its inflow pressure maintained, thus stabilizing the water flow. 
     The first tank  200  can be hermetically closed, excluding the inlet pipe  210  or an air flow pipe  220  (to be described). Accordingly, the pressure of water introduced into the first tank  200  can be maintained. To this end, as shown in  FIGS. 1 to 3 , the first tank  200  may include a first tank body  200   a  with an open upper portion and an empty space therein, and a first tank cover  200   b  covering the open upper portion of the first tank body  200   a . However, the configuration of the first tank  200  is not limited thereto and the first tank  200  may have any configuration so long as it can allow water to be cooled to be introduced thereinto, maintain the inflow pressure of introduced water, and stabilize the water flow. 
     Meanwhile, as shown in  FIGS. 1 and 2 , an air flow pipe  220  may be formed on an upper portion of the first tank  200 . The air flow pipe  220  may include a check valve (V). Accordingly, when water to be cooled is introduced into the first tank  200  through the inlet pipe  210 , air included in the interior of the first tank  200  or the second tank  300  may be discharged to the outside through the air flow pipe  220 . In this case, the check valve (V) provided in the air flow pipe  220  allows air included in the interior of the first tank  200  or the second tank  300  to discharged to the outside through the air flow pipe  220  yet prevents external air from being introduced into the first tank  200  or the second tank  300  through the air flow pipe  220 . Accordingly, water can be smoothly introduced into the first tank  200  or the second tank  300 . 
     As shown in  FIGS. 1 to 3 , the second tank  300  may be provided in the interior of the first tank  200  such that water of the first tank  200  can be introduced thereinto. Accordingly, as mentioned above, water is introduced into the first tank  200  and then water stabilized in flow can be introduced into the second tank  300  while its inflow pressure is maintained. To this end, an inlet hole  320  may be formed on an upper portion of the second tank  300 . Accordingly, water introduced into the first tank  200  and stabilized in its flow can be introduced to the second tank  300  through the inlet hole  320 , while the inflow pressure is being maintained. Since the inlet hole  320  is formed on the upper portion of the second tank  300 , the water stabilized in flow, with the inflow pressure maintained, can be introduced to the upper portion of the second tank  300  through the inlet hole  320  and then flow to a lower portion of the second tank  300 . 
     Meanwhile, as shown in  FIGS. 1 and 2 , one inlet hole  320  may be formed on the upper portion of the second tank  300 , or as shown in  FIG. 3 , two or more inlet holes may be formed. As shown in  FIG. 4 , a flow guide  321  may be provided in the second tank  300 , namely, to a portion of the second tank cover  300   b , adjacent to the inlet hole  320 . Water, flowing in the first tank  200 , is stabilized in its flow while the inflow pressure is maintained, and is rotatably introduced to the second tank  300  through the inlet hole  320 . Accordingly, water in the vicinity of the evaporator  400  and water of other portions are mixed in the second tank  300 , and in this case, the water in the vicinity of the evaporator  400  is not cooled further than that of other portions, resulting in a situation in which water in the second tank  300  can be evenly cooled. 
     Also, as shown in  FIGS. 1 to 3 , the evaporator  400  is provided in the interior of the second tank  300 . The evaporator  400  may be included in a refrigerating cycle (not shown). Accordingly, a refrigerant flows in the interior of the evaporator  400 . The refrigerant flowing in the evaporator  400  and water flowing in the second tank  300 , upon being introduced thereto, are heat?exchanged. Namely, heat is transferred from the water flowing in the second tank  300  to the refrigerant flowing in the evaporator  400 , cooling the water in the second tank  300 . As mentioned above, since the water introduced into the first tank  200  is introduced in a stable state to the second tank  300 , water in the second tank  300  can be smoothly cooled. Also, water can be cooled with the inflow pressure thereof maintained. 
     Meanwhile, as shown in  FIG. 5 , ice (I) can be generated at the evaporator  400  according to the heat transfer from water introduced to flow in the second tank  300  to the refrigerant flowing in the evaporator  400 . Water introduced to flow in the second tank  300  can be cooled by the ice (I) generated in the evaporator  400 . Accordingly, water introduced into the second tank  300  can be quickly cooled, improving cooling efficiency. 
     With reference to  FIGS. 1 to 3 , an outlet pipe  310  may be connected to the second tank  300 . Water cooled as described above can be discharged through the outlet pipe  310 . The outlet pipe  310  may be connected to a lower portion of the second tank  300  as shown in  FIGS. 1 to 2 . Accordingly, water, flowing from the upper portion and the lower portion in the tank  300  so as to be cooled by the evaporator  400  or by the ice (I) generated in the evaporator  400  can flow to a lower side of the second tank  300  through the outlet pipe  310 . Thus, water, starting from that present at the lower portion of the second tank  300  having a relatively low temperature can be discharged from the second tank  300 . 
     Also, as shown in  FIG. 3 , in order for the water cooled by the evaporator  400 , while flowing from the upper portion to the lower portion of the second tank  300 , to flow out to the lower portion of the second tank  300 , the outlet pipe  310  may penetrate through the first tank  300  so as to be connected to the second tank  300 . Also, as illustrated, one end portion of the outlet pipe  310  may be positioned at the lower portion of the second tank  300 . Accordingly, the cooled water can flow out from the lower portion of the second tank  300 . 
     As shown in  FIG. 3 , an air flow hole  310   a  may be formed in the outlet pipe  310 . With the presence of the air flow hole  310   a , when water to be cooled is introduced into the first tank  200  through the inlet pipe  210 , air included in the interior of the first tank  200  or the second tank  300  can be discharged to the outside through the air flow hole  310   a  and the outlet pipe  310 . Accordingly, without the air flow pipe  220  and the check valve (V), air included in the interior of the first tank  200  or the second tank  300  can be discharged to the outside. Thus, water in the first tank  200  or the second tank  300  can be smoothly introduced. 
     The outlet pipe  310  may be connected to a faucet (not shown), a cock (not shown), or the like. Thus, cooled water flowing out through the outlet pipe  310  of the second tank  300  can flow out through the faucet, the cock, or the like, so as to be supplied to the user. 
     The second tank  300 , excluding the inlet hole  320  or the outlet pipe  310  may be hermetically closed. Accordingly, the pressure of water introduced into the first tank  200  and the second tank  300  can be maintained. To this end, as shown in  FIGS. 1 to 3 , the second tank  300  may include a second tank body  300   a  with an open upper portion and an empty space therein, and a second tank cover  300   b  covering the open upper portion of the first tank body  300   a . Also, as shown in  FIG. 4  and as described above, the inlet hole  320  may be formed on the second tank cover  300   b . Also, the second tank cover  300   b  may include an outlet pipe passage hole H 1  allowing the outlet pipe  310  to pass therethrough and ice size sensor passage holes H 2  allowing ice size sensors SI 1  and SI 2  to pass therethrough. In addition, the second tank cover  300  further includes the foregoing flow guide  321 . However, the configuration of the second tank  300  is not limited thereto and the second tank  300  may have any configuration so long as it can allow water to be cooled to be introduced thereinto, maintain the inflow pressure of introduced water, and stabilize the water flow. 
     According to the configuration of the first tank  200  and the second tank  300 , although water is introduced at high pressure to the cold water tank  100 , the introduced water can stay in a stable state for a time sufficient to be cooled in the cold water tank  100 . 
     Thus, water cooled by the evaporator  400  in the second tank  300  is cooled in a state in which the inflow pressure is maintained. Thus, when cooled water flows out through the faucet, the cock, or the like, to the outside, the inflow pressure is maintained. Accordingly, although the faucet, the cock, or the like, is not positioned under the cold water tank  100 , cooled water can flow out through the faucet, the cock, or the like. Thus, the height of the faucet, the cock, or the like, can be free. 
     Meanwhile, as shown in  FIGS. 1 and 2 , the second tank  300  may include a temperature sensor (S). Thus, temperature of water cooled in the second tank  300  can be adjusted. 
     Besides, as shown in  FIG. 3 , the ice size sensors SI 1  and SI 2  may be provided in the second tank  300  in order to sense the size of ice (I) generated in the evaporator  400 . Accordingly, when water introduced to and flowing in the second tank  300  is cooled by the ice (I) generated by the evaporator  400 , the degree of cooling thereof can be adjusted by sensing the size of the ice (I). In the present exemplary embodiment, cold refrigerant introduced into the evaporator  400  flows upward in the evaporator  400  and then flows downward in a spiral form in the evaporator  400 , the temperature of the refrigerant in the upper portion of the evaporator  400  is lower than that of the lower portion of the evaporator  400 . Thus, as shown in  FIG. 5 , ice (I) is generated, starting from the upper portion of the evaporator  400 . Accordingly, when the thickness of ice (I) generated in the evaporator  400  is thin, the size of the ice (I) is sensed by the ice size sensor SI 2 , and when the thickness of the ice (I) is thick, the size of the ice (I) is sensed by the ice size sensor SI 1 . Thus, when the size of the ice (I) is sensed by the ice size sensor SI 2 , the flow amount of the cold refrigerant flowing in the evaporator  400  is increased or the temperature is lowered to strengthen the degree of cooling water, and when the size of the ice (I) is sensed by the ice size sensor (SI 1 ), the flow amount of the cold refrigerant flowing in the evaporator  400  is reduced or the temperature is increased to lessen the degree of cooling water, thus adjusting the degree of cooling water. 
     The operation of the cold water tank  100  according to an exemplary embodiment of the present invention will now be described with reference to  FIG. 5 . 
     First, the inlet pipe  210  of the first tank  200  is connected to a water supply source (not shown), such as a direct water type water purifier (not shown). Then, the outlet pipe  310  of the second tank  300  is connected to a faucet, a cock, or the like. Thereafter, when the direct water type water purifier, or the like, operates, water to be cooled is filtered in the direct water type purifier (not shown), or the like, is introduced into the interior of the first tank  200  through the inlet pipe  210  of the first tank  200 . 
     In this case, the water to be cooled is introduced into the interior of the first tank  200  through the inlet pipe  210  at a fast speed owing to the inflow pressure. In line with this, air included in the first tank  200  or the second tank  300  is discharged to the outside through the air flow pipe  220  of the first tank  200 . As shown in  FIG. 3 , the water introduced to the first tank  200  through the inlet pipe  210  flows from the lower portion to the upper portion in the first tank  200  while rotating in the interior of the first tank  200 . Namely, the water flows in a spiral form in the interior of the first tank  200 . The speed of the water, which flows in the spiral form after being introduced into the interior of the first tank  200 , is reduced while it flows from the lower portion to the upper portion in the first tank  200 . Accordingly, the water flow is stabilized. However, the inflow pressure of the water is maintained, rather than being degraded. 
     In this manner, the water, in a stable state with the inflow pressure maintained and with the speed reduced, is introduced into the second tank  300  through the inlet hole  320  of the second tank  300  connected to the first tank  200  as shown in  FIG. 5 . The water introduced into the second tank  300 , flowing from the upper side to the lower side in the second tank  300 , is cooled by the evaporator  400  provided in the second tank  300 . As shown in  FIG. 5 , a refrigerant flows in the interior of the evaporator  400 . Accordingly, the refrigerant flowing in the evaporator  400  and water flowing in the second tank  300  are heat?exchanged. Namely, heat is transferred from the water flowing in the second tank  300  to the refrigerant flowing in the evaporator  400 , cooling the water in the second tank  300 . 
     Meanwhile, as shown in  FIG. 5 , ice (I) can be generated in the vicinity of the evaporator  400  according to the heat exchange. Thus, water introduced into the second tank  300  can be cooled by the heat exchange with the ice (I), namely, by the heat transfer from the water introduced into the second tank  300  to the ice (I). Accordingly, water introduced into the second tank  300  can be more effectively cooled. 
     The water, flowing from the upper portion to the lower portion in the second tank  300 , cooled by the evaporator  400  or by the ice (I) formed at the evaporator may flow out through the outlet pipe  310  of the second tank  300 . The cold water flowing out through the outlet pipe  310  can be provided to the user through a faucet (not shown), a cock (not shown), or the like. As mentioned above, the inflow pressure of the water flowing out through the faucet, the cock, or the like, is maintained. Thus, the faucet, the cock, or the like, may have any height at which water can reach the faucet, the cock, or the like, by the inflow pressure. Thus, the height of the faucet, the cock, or the like, can be freely determined. 
     As set forth above, the use of the cold water tank  100  according to exemplary embodiments of the invention, has the following advantages. That is, although water is introduced at high pressure, the introduced water can remain in the cold water tank for a period of time required for being cooled, and although water is introduced at high pressure, the introduced water can be in a stable state in the cold water tank  100 . Thus, water can be cooled with its inflow pressure maintained, and the degree of freedom of a faucet or a cock for allowing cold water to flow therethrough can be improved in its height. 
     While the present invention has been shown and described in connection with the exemplary embodiments, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the invention as defined by the appended claims.