Abstract:
The invention refers to a toilet system ( 1 ) comprising at least one toilet unit ( 2 ) having a device ( 3 ) for macerating and transportation of waste together with flush-water, so-called blackwater ( 4 ) to a holding-tank ( 6 ), and a combustion chamber ( 8 ) with economizer connectable directly or indirectly via a transportation-tank to said holding-tank ( 6 ), in said combustion chamber ( 8 ) the blackwater is incinerated.

Description:
BACKGROUND OF THE INVENTION  
     FIELD OF THE INVENTION  
       [0001]     The present invention relates to a toilet system wherein an incineration of collected urine and faeces takes place in a separate combustion chamber thereby providing a greater user capacity of the toilet system.  
         [0002]     In the market there are today a number of different types of toilets without connection to the public sewage-system, which have different solutions of collecting devices for urine and faeces. Many of these toilets have proved to be constructed in a most complicated way and are also expensive with a high operating cost. It has also proved to be complicated to carry out a simple and odor free discharging of the contents when needed and in those cases that the toilet is of a kind where incineration of the faeces takes place, it has been difficult to accomplish an efficient and economical incineration.  
       SUMMARY OF THE INVENTION  
       [0003]     The object of the present invention is to eliminate these problems and to provide a new type of toilet included in a toilet system having a separate combustion chamber. The distinguishing features of the invention are stated in the following claims.  
         [0004]     In accordance with the invention a toilet system has now been provided with one in the same included combustion chamber, which in an excellent way fulfills its purpose at the same time as the system also is relatively inexpensive and easy to manufacture. The toilet system according to the invention is almost odor free due to its ingenious structure and during discharging only a certain amount of ashes needs to be removed from the combustion chamber of the incinerator, which is done by a few simple manual operations by releasing of a simply dismountable clean-out door at the top of the combustion chamber, after which the ashes are simply removed by, for example, vacuuming the bottom of the combustion chamber. From the toilet-unit comes, after a macerating procedure, while adding water so called “blackwater” or sewage, where all solids are finely-cut in a relatively homogenous solution consisting of urine, faeces and flush water. By a special circulation of flue gases in the combustion chamber those combustion gases that are generated during the incineration and vaporization of the blackwater can efficiently be removed through a special outlet. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0005]     The invention is described below with reference to a preferable embodiment and with reference to the drawings enclosed, in which:  
         [0006]      FIG. 1  shows a schematic view of the toilet system according to the invention that is controlled by a microprocessor;  
         [0007]      FIG. 2  shows a view from above of the combustion chamber;  
         [0008]      FIG. 3  shows a side view of the combustion chamber in section and from which view is seen how the bottom of the combustion chamber is designed;  
         [0009]      FIG. 4  shows a part view of the bottom of the combustion chamber, that consists of a wave-profile where flue gases pass under the bottom of the combustion chamber in the wave-peak and how a sensor is located at the bottom for controlling the incineration and vaporization under assistance of a microprocessor;  
         [0010]      FIG. 5  shows a side view partly in section of the combustion chamber illustrated in  FIGS. 2 and 3  and from which view is seen how the fastener for a burner is designed and how the flue gases are fed from the combustion chamber and downwards below its bottom and further on through the flue gas channels through an outlet;  
         [0011]      FIG. 6  shows an end view of the combustion chamber illustrated in  FIGS. 2-5  and from which view is seen how a flue gas shield is mounted in connection to the flue gas channels in order to spread out the flue gases over the bottom of the combustion chamber;  
         [0012]      FIG. 7  shows a view from the side in section of a ceramic lining, which is used to insulate the combustion chamber; and  
         [0013]      FIG. 8  shows a view from above of the lining of  FIG. 7  of the combustion chamber. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0014]     As shown in  FIG. 1  is an embodiment of a toilet system according to the present invention, which mainly consists of three main parts namely a toilet unit  2 , a holding-tank  6  and combustion chamber  8  with economizer. The toilet unit  2  is equipped with a device  3  for macerating and transportation of the waste together with the flush water so called blackwater  4  in a first pipe  5  to the holding-tank  6 , which is directly or indirectly connected via a transportation tank, not illustrated in the drawings, to the combustion chamber  8  with the economizer via a second pipe  7 .  
         [0015]     The device  3  for macerating the faeces and transportation of the blackwater  4  through the first pipe  5  to the holding-tank  6  comprises a pump  9  with a macerator known per se and/or with vacuum and the second pipe  7  is provided in this example with a dosage pump  10  for transportation of the blackwater  4  to the combustion chamber  8 , from which the flue gases are fed out via its specially designed bottom  11  through an outlet  14  to the atmosphere.  
         [0016]     The combustion chamber  8  according to the invention is according to the presented example designed to ensure a complete incineration of all solids, faeces in the blackwater  4  that is dosed by the pump  9  to the combustion chamber  8  from the holding tank  6  located upstream in the system. With its unique bottom design an incineration is achieved with a high efficiency and thereby a low fuel consumption. Also the size and weight of the combustion chamber  8  has been able to be limited because of the efficient utilization of the excess energy in the flue gases. The bottom design of the combustion chamber  8  consists in that its bottom  11  includes a wave-profile  12 , where the flue gases are passing below the entire combustion chamber bottom  11  in wave peaks  13 , which are sealed downwards in order to constitute a number of parallel alongside running flue gas channels  12 ′, through which the flue gases from the incineration pass and thereafter are guided out to the atmosphere through the outlet  14 . The flue gas channels  12 ′ are extending in the flow direction of the incineration gases at the same time as the excess of heat from the flue gases is brought back to the blackwater  4  located in the wave troughs  13 ′, thereby a larger bottom surface is obtained in the combustion chamber  8  than otherwise, which in turn gives a higher efficiency.  
         [0017]     By the design of the bottom  11  of the combustion chamber  8 , the wave troughs  13 ′ constituted by the wave profiles  12  consist of a number of next to each other and all across the bottom extending V-formations  15  for receiving the blackwater  4 . By this design the excess heat in the flue gases are brought back to the blackwater  4 , which is located in the wave troughs  13 ′ at a flange-efficiency of 100%. In order to secure that the heat transfer is performed in a uniform way all across the combustion chamber bottom  11 , a flue gas shield  16  is mounted at the end of the flue gas channels  12 ′. This causes a narrowing at the center of the bottom profile in order to force the flue gases to spread evenly over the entire cross section and in this way cold spots are avoided and the entire bottom surface is used efficiently.  
         [0018]     A well known burner is mounted on a flange  17  directly on the top  18  of the combustion chamber  8  in such a way that the head of the burner is protected from a direct impact from both the blackwater  4  during pumping and also from vapor during the incineration process itself. The flue gases together with the vaporized blackwater  4  are fed out from the combustion chamber  8  via an opening  19  at the top  20  of the rear wall  20 ′ of the combustion chamber. In order to give the flue gases maximum duration in the combustion chamber  8 , the burner can be mounted as far away as possible from the flue gas opening  19 . The opening  19  is designed in size after the capacity of the fan of the burner i.e. flows and pressure. The flue gases are thereafter directed into a slot  21  at the rear end of the combustion chamber  8  and under the bottom  11  of the combustion chamber.  
         [0019]     In making the emptying of the incineration chamber of the combustion chamber  8  easier without the need to disassemble the burner, the top  18  of the combustion chamber  8  has been equipped with a simply dismountable clean-out door  22 , through which the cleaning can be done by for example vacuuming. The dimensions of the combustion chamber  8  are adjusted to the output of the burner, which in its turn is determined by the number of users or the number of connected toilets.  
         [0020]     The system according to the invention shortly functions as follow. A low flush toilet unit  2  macerates the waste at flushing and pumps the waste to the holding-tank  6 . The flush water comes either from the ordinary pressure water system alternatively from a separate closed pressure water system, connected to the toilet. The holding-tank  6  will contain so called blackwater  4 , where all solids are finely-cut in a relatively homogenous solution. The holding-tank  6  is designed to contain one to two days maximum usage of the toilet unit  2  and the holding-tank  6  can be located anywhere it is suitable from a space point of view. There is no demand to locate the holding-tank  6  in close connection to neither the toilet unit  2  nor the combustion chamber  8 .  
         [0021]     At the outlet side of the holding-tank  6  an ordinary membrane pump can be used for transportation of the blackwater to the combustion chamber. The membrane pump is extremely reliable and totally insensitive to clogging and, at the same time, it operates under high pressure. The combustion chamber  8  is heated by a top mounted burner. Burner output and size of the combustion chamber can vary and is designed after the number of users of the toilet unit and the number of connected toilets. The entire process is electronically controlled and supervised by a microprocessor  23 .  
         [0022]     The incineration of the blackwater  4  from the holding-tank  6  is programmed to take place preferably at night-time but can be chosen to take place at optional occasion alternatively when the tank is full. When incineration has been started by clock or alternatively a full tank, the microprocessor  23  gives a signal to the pump to run for a predetermined number of seconds and to pump in a first controlled amount of blackwater to the combustion chamber  8 . The burner starts and operates thereafter continuously without interruption during the entire incineration. When the fluid level has decreased to the top of the wave-profile  12  of the bottom  11 , a new signal is given to the pump, which pumps a second amount of blackwater into the combustion chamber  8 . The vaporization goes on continuously at a constant speed and when the fluid level once again has decreased to the top of the wave-profile  12 , a new signal is given to the pump for the third amount of blackwater and so on.  
         [0023]     These dosages continue until the holding-tank  6  is empty. At this time the microprocessor  23  gives a signal to start the final incineration. This is done in order to secure a complete incineration of all solids, mainly faeces. The temperature in the combustion chamber increases as no more vaporization of fluids takes place and the time for final incineration can be varied after operation conditions. The electricity supply is adaptable to 12, 24 or alternatively 220 Volt. The remains that are received from the process are totally harmless. The ashes that can be vacuumed out of the combustion chamber a few times per year and the emission to the surroundings through a chimney mounted at the outlet odor pipe  14 , consists, besides of flue gases from the burner, of 100% odor free vapor.  
         [0024]     The control of the incineration and the vaporization of the blackwater  4  in the combustion chamber  8  is made by continuous registration of the change of temperature in the combustion chamber  8 , which temperature is measured by a sensor  24  placed in a protective-casing  25 , which is mounted in the combustion chamber  8 . The location of this is of major importance in order to achieve a fast and careful registration of the vaporization. The sensor  24  is located on the same side as the flue gases leave the combustion chamber and is mounted directly on top of a wave peak  13  as shown in  FIG. 4 . The sensor  24  is connected to the microprocessor  23 .  
         [0025]     The principle for control is in accordance to the following. At start of operation a first fixed amount of blackwater  4  is pumped into the combustion chamber  8  and this volume is exactly as much to fill all wave troughs  13 ′ in the profile bottom and gives a fluid surface a few millimeters above the wave peaks  13 . The sensor  24  is hereby located in the blackwater and registers the fluid temperature. The burner starts and heats thereafter the blackwater  4  to 100° C., whereupon the vaporization is initiated.  
         [0026]     When the fluid level has decreased to the wave peaks  13  the sensor  24  is located in air and the temperature rises immediately. When this registers approximately 120° C. a new signal is given to the pump which pumps a second fixed amount of blackwater  4  in to the combustion chamber  8 . The sensor  24  is once again located in the blackwater  4  and achieves the same temperature as the blackwater has during the moment of pumping. The temperature of the fluid rises rapidly to 100° C., which value is registered by the device  24 . The temperature is registered in the microprocessor  23  until the surface of the fluid once again has decreased to the wave peaks  13 , whereupon the sensor  24  rapidly registers an increasing temperature.  
         [0027]     When the temperature once again passes 120° C. a signal is given to the pump to pump a third fixed amount of blackwater  4  into the combustion chamber  8 . The process is repeated until the holding-tank  6  is empty. The advantage with this control is that it always takes place a maximum heat transfer from the hot flue gases to the cold fluid (100° C.). If the surface of the fluid is allowed to decrease under the wave peaks  13  the heat transfer is reverted and the higher temperature in the combustion chamber heats the flue gases while passing through the flue gas channels  12 ′ in the bottom  11 . Hereby it is continuously secured during the entire vaporization process that the flange-efficiency is 100%.  
         [0028]     When the holding-tank  6  is empty the process goes in to the final incineration and a signal is given from the tank—tank empty—whereby no further signal is given to the pump. Instead the time starts for final incineration which is pre-programmed according to actual operating conditions and during this time all fluid is vaporized, whereby only solids as remaining faeces remain in the wave troughs  13 ′. These are now exposed to both direct heat-radiation from the burner and to heat from the flue gases under the profile bottom. The temperature rises rapidly and eventually remaining faeces are ignited and when the temperature has reached a pre-set maximum level the burner is shut off. The time is set long enough to secure a safe final incineration.  
         [0029]     In  FIGS. 7 and 8  an upside down ceramic box  26  is illustrated, which is intended to insulate the combustion chamber  8 , causing its outside not to reach too high a temperature, which otherwise could cause injuries. Besides, the efficiency further increases due to the box  26  at the same time as the temperature tensions in the non-corrosive combustion chamber are reduced. The box  26  is manufactured by for example aluminum oxide (Al 2 O 3 ) or aluminum silica. The box results in a possibility to increase the temperature in the combustion chamber without increased demand to increase the thickness of the external insulation. When the right temperature is obtained in the combustion chamber  8  and the vaporization has turned into a steady-state condition, the speed of vaporization increases considerably and the energy consumption is decreased correspondingly. The increased vaporization is due to the heat storage capacity that occurs in the aluminum oxide/aluminum silica. This increased capacity is valuable mainly in those cases when the toilet system  1  is intended to be used by many users, resulting in a high load.