JP2007309615A - Hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein, when a filling hot water temperature to a bathtub is lowered for safety, a filling hot water amount necessary for raising a hot water temperature in the bathtub to predetermined temperature is increased, and as a result, a hot water amount of the bathtub becomes more than necessary, and in some cases, it exceeds a capacity of the bathtub. <P>SOLUTION: The hot water supply device is provided with a bathtub water drawing pipe connected to a middle part of a filling hot water pipe from the bathtub to draw out water of the bathtub, and a pump arranged in the bathtub water drawing pipe. The water of the bathtub is drawn out, mixed with hot water from a heating means, and it is filled into the bathtub. By this, the high temperature water from the filling hot water pipe is mixed with the water of the bathtub to lower the temperature, it can be filled into the bathtub at a safe temperature, and the filling hot water amount to the bathtub can be suppressed also. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water supply apparatus that heats water and pours water into a bathtub.

  As a conventional hot water supply apparatus of this type, for example, there is one described in Japanese Patent Laid-Open No. 2002-130804. FIG. 6 shows a conventional hot water supply apparatus described in the publication.

As shown in FIG. 7, this hot water supply apparatus connects the hot water tank 1 and the heating means 2 with a circulation circuit 3, and the circulation pump 4 provided in the circulation circuit 3 supplies water from the lower part of the hot water tank 1 to the heating means 2. The hot water heated there is returned to the hot water tank 1 and stored. A hot water supply pipe 5 is connected to the lower part of the hot water tank 1 to supply water, and a hot water pipe 7 is connected from the upper part of the hot water tank 1 to the bathtub 6. By opening 8, hot water is poured into the bathtub 6. Moreover, when the hot water temperature in the bathtub 6 falls at the time of bathing, the hot water temperature in the bathtub 6 is raised by pouring hot water from the pouring pipe 6.
JP 2002-130804 A

  Such a hot water supply device is used by pouring hot water into the bathtub 6 and mixing it when it is desired to raise the temperature of the hot water in the bathtub 6. At this time, since the water level of the bathtub 6 rises according to the amount of hot water to be poured, in order to suppress the rise in the water level, it is necessary to keep the pouring temperature as high as possible and to keep the amount of hot water poured into the bathtub 6 small. However, if there is a person in the bathtub 6, there is a possibility that the body may touch the hot water directly, so the temperature of the hot water to be poured cannot be made too high for safety reasons, so as not to get burned. For example, the temperature needs to be 60 ° C. or lower. When the pouring temperature is lowered, the amount of pouring necessary to bring the temperature of the hot water in the bathtub 6 to a predetermined temperature increases, and as a result, the amount of hot water in the bathtub becomes larger than necessary. There was a problem of exceeding.

  The present invention solves the above-mentioned problem, and suppresses the amount of hot water to be poured into the bathtub, and lowers the temperature of the hot water poured into the bathtub so that the hot water can be poured into the practical and safe bathtub. An object is to provide a hot water supply device that can be used.

  In order to solve the above-mentioned conventional problems, when hot water from the bathtub water take-out pipe flows into the bathtub pouring pipe and mixes, the bath pouring pipe is connected by the pouring side flow rate adjusting means according to the temperature of the mixed hot water. Since the flowing flow rate is variable, hot water from the pouring pipe can be mixed with the water in the bathtub to lower the temperature and then poured into the bathtub at a safe temperature, and the amount of pouring into the bathtub can be kept small. it can.

  Also, when hot water from the bathtub water outlet pipe flows into the bathtub pouring pipe and mixes, the flow rate flowing through the bathtub water outlet pipe is varied by the bathtub side flow rate adjusting means according to the temperature of the mixed hot water. Hot water from the tube can be mixed with the water in the bathtub to lower the temperature and then poured into the bathtub at a safe temperature, and the amount of water poured into the bathtub can be reduced.

When the hot water supply device of the present invention mixes the hot water from the bathtub water extraction pipe flowing into the bathtub pouring pipe,
According to the temperature of the mixed hot water, the flow rate flowing through the bathtub pouring pipe is varied by the pouring side flow rate adjusting means. In addition, when hot water from the bathtub water extraction pipe flows into the bathtub pouring pipe and mixes, the flow rate flowing through the bathtub water extraction pipe is varied by the bathtub side flow rate adjusting means according to the temperature of the mixed hot water It is.

  Thereby, the temperature of the hot water from the pouring pipe is lowered by the taken out bath water and poured into the bathtub. Since the temperature returning to the bathtub can be kept low while increasing the temperature of the hot water supplied from the hot water supply device, it is possible to perform hot water pouring with an increase in the amount of bathtub water at a safe temperature.

  The first invention is a heating source that heats water to make hot water, a bathtub pouring pipe that pours hot water heated by the heating source into the bathtub, and a bathtub water extraction pipe that circulates the bathtub water in the bathtub, In addition, a hot water flow rate adjusting means is provided in the middle of the bathtub pouring pipe, so that the hot water from the bathtub water take-out pipe flows into the bathtub pouring pipe and can be mixed. When the hot water from the bathtub water extraction pipe flows into the bathtub pouring pipe and mixes, the flow rate flowing through the bathtub pouring pipe is varied by the pouring side flow rate adjusting means according to the temperature of the mixed hot water. is there. Thereby, the temperature of the hot water from the pouring pipe is lowered by the taken out bath water and poured into the bathtub. Since the temperature returning to the bathtub can be kept low while increasing the temperature of the hot water supplied from the hot water supply device, it is possible to perform hot water pouring with an increase in the amount of bathtub water at a safe temperature. Moreover, the temperature which returns to a bathtub by changing the mixing ratio of the hot water from a bathtub water and a pouring pipe can be changed by changing the flow volume of the bathtub water from a bathtub water extraction pipe | tube.

  Moreover, 2nd invention is the bathtub water extraction which circulates the bathtub water in which the heating source which heats water and makes hot water, the hot water heated by the heating source into the bathtub, and the bathtub water in a bathtub is circulated A bathtub and a bathtub-side flow rate adjusting means arranged in the middle of the bathtub water extraction pipe, so that the hot water from the bathtub water extraction pipe flows into the bathtub filling pipe and can be mixed. When hot water from the bathtub water extraction pipe flows into the bathtub pouring pipe and is mixed, the flow rate flowing through the bathtub water extraction pipe is varied by the bathtub side flow rate adjusting means according to the temperature of the mixed hot water. Is. Thereby, the temperature of the hot water from the pouring pipe is lowered by the taken out bath water and poured into the bathtub. Since the temperature returning to the bathtub can be kept low while increasing the temperature of the hot water supplied from the hot water supply device, it is possible to perform hot water pouring with an increase in the amount of bathtub water at a safe temperature. Moreover, the temperature which returns to a bathtub by changing the mixing ratio of the hot water from a bathtub water and a pouring pipe can be changed by changing the flow volume of the bathtub water from a bathtub water extraction pipe | tube.

  In the third aspect of the invention, in particular, the hot water supply apparatus of the first or second aspect of the invention is provided with a hot water storage tank for storing heated hot water, so that water is heated in advance by the heating means and stored in the hot water storage tank. In addition, it can be used when necessary, and hot water exceeding the heating capacity of the hot water supply apparatus can be supplied.

  The fourth aspect of the invention is particularly energy saving in that the heating source of the hot water supply apparatus of the first to third aspects of the invention is a heat pump, whereby heating using atmospheric heat is performed and hot water is stored with heating energy higher than the input energy. It can be set as the apparatus which suppressed running cost.

  In the fifth invention, in particular, the refrigerant circuit of the heat pump of the fourth invention is a supercritical refrigerant circuit in which the pressure is equal to or higher than the critical pressure, and the refrigerant is heated by heating water with the refrigerant whose pressure is increased to the critical pressure or higher. Since it is pressurized to a pressure higher than the critical pressure by the compressor, it does not condense even if the temperature is lowered by depriving of heat by heating water. Therefore, it becomes easy to form a temperature difference between the flow path on the refrigerant side and the flow path on the water side over the entire heat exchanger that heats the water with the refrigerant, so that high-temperature hot water is obtained and the heat exchange efficiency is increased.

  In the sixth aspect of the invention, the heating source of the first to third aspects of the invention is a fuel cell, so that high temperature water is stored by using waste heat generated during power generation and used for hot water supply, so that energy use efficiency is high. It can be a system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a configuration diagram of a hot water supply apparatus according to the first embodiment of the present invention. First, the basic configuration will be described.

  This hot water supply device is a hot water storage type device, and a hot water storage tank 21 for storing heated hot water is connected with a water supply pipe 22 for supplying water and a hot water supply pipe 23 for taking out the hot water. Water supply is branched from the water supply pipe 22 through a water supply bypass pipe 24 and connected to the hot water supply pipe 23. A hot water mixing valve 25 having a variable mixing ratio is provided at this connection portion so that hot water from the hot water storage tank 21 and hot water from the water supply bypass pipe 24 are mixed to supply hot water. Further, in order to pour hot water into the bathtub 26, a hot water pipe 27 branched from the hot water pipe 23 and connected to the bathtub 26 is provided, and the hot water bypass pipe 24 is branched into the hot water pipe 27. Similarly to the hot water supply pipe 23, a hot water mixing valve 28 having a variable mixing ratio is provided at this connection portion, and hot water from the hot water storage tank 21 and hot water from the water supply bypass pipe 24 are mixed to pour hot water. Like to do. Further, a pouring valve 29 serving as a pouring side flow rate adjusting means is provided downstream of the pouring mixing valve 28 in the pouring pipe 27. The pouring valve 29 is a flow rate adjusting valve whose opening degree can be arbitrarily set. Further, a bathtub water take-out pipe 30 for taking out water from the bathtub 26 is connected to the downstream of the pouring valve 29 in the pouring pipe 27 from the bathtub 26, and a pump 31 for sucking out the water in the bathtub 26 into the bathtub water take-out pipe 30 is provided. Provided.

  Further, a bath heating heat exchanger 32 is provided downstream of the pouring pipe 27 with respect to the bath water extraction pipe 30, and hot water is taken out from the upper part of the hot water tank 21 and supplied to the bath heating heat exchanger 32. The bath heating circulation circuit 33 forms a circulation circuit so as to return to the lower part of the hot water tank 21. Hot water in the hot water storage tank 21 is supplied to the bath heating heat exchanger 32 by a bath heating circulation pump 34 provided downstream of the bath heating heat exchanger 32 in the bath heating circulation circuit 33, and exchanges heat with water flowing through the pouring pipe 27. And heating.

  Moreover, in order to heat the water in the hot water storage tank 21, the heat pump heat source 35 which collects and heats atmospheric heat as a heating source is provided. The heat pump heat source 35 uses carbon dioxide as a refrigerant. A hot water storage circulation pump 37 is provided to connect the water in the hot water circulation circuit 36 so that water from the lower part of the hot water storage tank 21 is heated by the heat pump heat source 35 and returned to the upper part of the hot water storage tank 21 to perform circulation.

  In addition, as the sensors, a pouring temperature detecting means 38 and a water level detecting means 39 are provided downstream of the bath heating heat exchanger 32 of the pouring pipe 27, and a bath water temperature detecting means 40 is provided in the bathtub water extraction pipe 30.

  The operation and action of the hot water supply apparatus configured as described above will be described below.

  First, the operation at the time of hot water storage operation in which the water in the hot water storage tank 21 is heated by the heat pump heat source 35 as a heating source to store hot water will be described. The hot water circulation pump 37 provided in the heat pump heat source 35 is driven to supply water below the hot water tank 21 to the heat pump heat source 35 by the hot water circulation circuit 36. The heat pump heat source 35 is an efficient heat source that can heat more than the input energy because it effectively uses the heat collected from the atmosphere to heat it, thereby saving energy and reducing running costs It can be a device.

The refrigerant used in the heat pump heat source 35 is carbon dioxide, and the water is heated by the refrigerant whose pressure has been raised above the critical pressure, so that the refrigerant is pressurized by the compressor above the critical pressure. Even if the temperature is lowered due to heat deprived, it does not condense. Therefore, it becomes easy to form a temperature difference between the flow path on the refrigerant side and the flow path on the water side in the entire heat exchanger that heats water with the refrigerant, and hot water having a high temperature of 80 to 90 ° C. is obtained, and the heat exchange efficiency Can be high.

  The high-temperature water heated by the heat pump heat source 35 is repeatedly returned to the upper part of the hot water storage tank 21 so that the water in the hot water storage tank 21 as a whole becomes high-temperature water. By storing hot water in the hot water storage tank 21 in this manner, there is an advantage that hot water supply exceeding the heating capability of the heat pump heat source 35 can be performed. Moreover, the temperature of the high-temperature water at this time is set to 80 to 90 ° C., which is significantly higher than about 40 to 60 ° C., which is the temperature used for hot water supply, and the amount of heat of the high-temperature water per unit volume is increased. Increase the amount of heat stored.

  At the time of hot water supply, the mixing ratio of the hot water from the hot water supply pipe 23 connected to the upper part of the hot water storage tank 21 and the water from the water supply bypass pipe 24 is adjusted at the hot water supply mixing valve 25 so as to have an arbitrary temperature suitable for hot water use. Mix and heat.

  Further, when pouring into the bathtub 26, the pouring valve 29 is opened and the mixing ratio of the pouring mixing valve 28 is adjusted to mix and pour so as to obtain the required hot water temperature of the bathtub 26. At this time, the water level detecting means 39 can pour the required amount of hot water in the bathtub 26 by pouring while detecting the water level in the bathtub 26.

  Specifically, as shown in FIG. 2, after the user requests pouring by a remote controller (not shown) (step 201), the water level detecting means 39 detects the water level of the bathtub (step 202). Then, the control means (not shown) determines whether or not the detected water level by the water level detecting means 39 is higher than a preset set water level (step 203), and the detected water level by the water level detecting means 39 is higher than the set water level. If it is higher, pouring is stopped (step 204).

  If the water level detected by the water level detection means 39 is lower than the set water level, a predetermined pouring time is set (step 205), and the pouring valve 29 is fully opened (step 206). Then, the pouring temperature detection means 38 measures the temperature of the hot water flowing through the pouring pipe 27 (step 207) and mixes the pouring so that the temperature measured by the pouring temperature detection means 38 becomes a preset pouring temperature. The valve 28 is controlled (step 208). Specifically, if the temperature measured by the pouring temperature detecting means 38 is higher than the set pouring temperature, the opening of the pouring mixing valve 28 is tilted to the water side, and the temperature measured by the pouring temperature detecting means 38 is set to the set pouring temperature. If the temperature is lower than the temperature, the opening of the hot water mixing valve 28 is inclined toward the hot water supply pipe.

  This process is continued until the pouring time reaches the time set in step 205, and when it is determined that the predetermined time has been reached (step 209), the pouring valve 29 is closed (step 210) and the process returns to step 202. . This process continues until step 204 is performed.

  Next, as time passes after the pouring of water into the bathtub 26 is completed, the temperature of the water in the bathtub 26 is reduced against the decrease in the temperature of the hot water in the bathtub 26 due to human bathing or heat radiation to the outside air. The method to be raised will be described.

For example, the pump 31 is periodically driven to take out the water in the bathtub 26 to the bathtub water extraction pipe 30 and detect the temperature by the bathtub water temperature detection means 40, such as every five minutes. When this detected temperature falls below a certain temperature, in order to raise the hot water temperature in the bathtub 26, the hot water mixing valve 28 is fully opened so that only hot water from the hot water supply pipe 23 flows, The pump 31 is driven to take out water from the bathtub 26 through the bathtub water extraction pipe 30, mix them, and return them to the bathtub 26. The hot-water supply valve 29 changes its opening degree to thereby change the bathtub 26
Since the flow rate ratio of the pouring pipe 27 to the flow rate of the water from the hot water can be changed, the pouring of the hot water so that the temperature of the hot water temperature detecting means 38 does not exceed 60 ° C. which is not dangerous even if a human body touches it. The opening of the valve 29 is adjusted to perform pouring (hot water).

  As a result, the supply temperature from the hot water storage tank 21 is made as high as possible to reduce the amount of hot water supplied to the bathtub 26 as much as possible, and the temperature of the hot water returning to the bathtub 26 is raised to a safe temperature. Can be made. At this time, since the temperature of the water taken out from the bathtub 26 can always be detected by the bathtub water temperature detection means 40 provided in the bathtub water extraction pipe 30, this heating is performed until the detected temperature reaches a predetermined temperature.

  Further, this hot water supply apparatus is provided with another method for raising the temperature of the water in the bathtub 26, and drives the pump 31 to drive the water taken out from the bathtub 26 by the bathtub water extraction pipe 30 and the bath heating circulation pump 34. Then, the hot water taken out from the hot water storage tank 21 by the bath heating circulation circuit 33 is heat-exchanged in the bath heating heat exchanger 32 to heat the water in the bathtub 26. In this method, since the water in the bathtub 26 only returns to the bathtub 26 through the bath heating heat exchanger 32, the amount of water in the bathtub 26 does not increase, and the water level does not increase. However, the high-temperature water taken out from the hot water storage tank 21 is heat-exchanged by the bath heating heat exchanger 32 to dissipate heat and then returned to the hot water storage tank 21, thereby deteriorating the temperature distribution in the hot water storage tank 21. When mixed with hot water in the hot water storage tank 21, the temperature of the hot water is lowered, and when mixed with water, the temperature of the water is raised. If it becomes a temperature that can not be used for hot water supply by mixing, it will naturally be lost, even if it is a temperature that can be used for hot water supply, this hot water remains unused for hot water supply etc. and you want to heat it to a high temperature again The heating by the heat pump heat source 35 becomes less efficient as the temperature of the water before heating increases.

  From the viewpoint of the heating efficiency by the heat pump heat source 35, it is better not to use the heating method for exchanging heat between the hot water in the hot water tank 21 and the water in the bathtub 26 by the bath heating heat exchanger 32 as much as possible. Therefore, when the temperature of the water in the bathtub 26 is lowered, the water level in the bathtub 26 is often lowered. First, as described above, the hot water from the hot water tank 21 and the bathtub water extraction The temperature of the water of the bathtub 26 is raised using the method of mixing the water of the bathtub 26 taken out from the bathtub 26 with the pipe | tube 30, and returning to the bathtub 26. FIG.

  Specifically, as shown in FIG. 3, first, after a user requests a hot water supply operation by a remote controller (not shown) (step 301), the opening degree of the pouring mixing valve 28 is set to the hot water supply pipe side. The pump 31 is driven (step 503) and the pouring valve 29 is opened (step 304). Then, the pouring temperature detecting means 38 measures the temperature of the hot water flowing through the pouring pipe 27 (step 305), so that the temperature measured by the pouring temperature detecting means 38 becomes a preset pouring temperature (60 ° C.). The bath water temperature is detected by the bath water temperature detecting means 40 while controlling the valve opening degree of the pouring valve 29 (step 306). The control means determines whether or not the temperature detected by the bath water temperature detecting means 40 reaches the bathtub set temperature determined by the user (step 308). If the temperature does not reach the bathtub set temperature, the control means returns to step 304 and continues the processing. If the temperature detected by the bath water temperature detecting means 40 has reached the bath set temperature, the pouring valve 29 is closed (step 309), the pump 31 is stopped (step 310), and pouring is terminated. (Step 311).

  Thus, heating using the bath heating heat exchanger 32 is preferably performed by preferentially using the method of mixing the water taken out from the bathtub 26 with the high-temperature water from the pouring pipe 27 and then pouring the water into the bathtub 26. It is possible to prevent deterioration of the temperature distribution of the hot water in the hot water tank 21 as much as possible.

In addition, water in the bathtub 26 is taken out by a bathtub water extraction pipe 30 connected to the pouring pipe 27 from the bathtub 26 and taken out from the bathtub 26, mixed with hot water in the pouring pipe 27, and poured into the bathtub 26. As a result, the temperature of the hot water from the pouring pipe 27 is lowered by the water taken out from the bathtub 26 and poured into the bathtub 26. While the temperature of the hot water supplied from the hot water supply device can be raised, the temperature returning to the bathtub 26 can be kept low, so that the hot water pouring can be performed at a safe temperature while suppressing the increase in the water level of the bathtub 26.

  In step 305, the opening degree of the pouring valve 29 is controlled so that the temperature measured by the pouring temperature detecting means 38 becomes a preset pouring temperature (60 ° C.). Instead of 29, the temperature may be adjusted by adjusting the flow rate of hot water with the opening of the pump 31, or may be adjusted simultaneously with the pump 31 and the pouring valve 29.

  Further, the present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the scope of the present invention.

(Embodiment 2)
FIG. 4 is a configuration diagram of a hot water supply apparatus according to the second embodiment of the present invention. The same configurations and elements as those of the first embodiment shown in FIG. 1 are denoted by the same names and numbers, and different points will be mainly described.

  As a configuration, the main difference from the first embodiment is that the hot water supply apparatus is first heated directly from the water supply pipe 22 by the heat pump heat source 35. Therefore, it does not have the hot water storage tank 21 and does not have a bath heating heat exchanger. Further, the pouring valve 29 is a simple on-off valve and does not have a flow rate control function, but the pump 31 can change its driving force so that the flow rate on the bathtub water outlet pipe 30 side can be changed. It is a DC pump.

  In the hot water supply apparatus configured as described above, differences in operation and action will be described below.

  First, when hot water is supplied from the hot water supply pipe 23 or hot water is supplied from the hot water supply pipe 27 to the bathtub 26, the hot water is directly heated by the heat pump heat source 35 and supplied. The heat pump heat source 35 has higher operating efficiency under operating conditions where the temperature of the high-temperature water after heating is low. Therefore, the heat pump heat source 35 is heated to a temperature close to the hot water supply or pouring temperature so that the temperature of the high-temperature water after heating is as low as possible. Do. Thereby, it can be set as the hot water supply apparatus more efficient than the hot water storage type. When hot water supply and pouring are performed at the same time and the temperatures are different, the temperature of the hot water heated by the heat pump heat source 35 is adjusted to the higher one of the temperatures, and the hot water mixing valve 25 or the hot water mixing valve 28 is used. To mix with the feed water according to each temperature.

  When a decrease in the temperature of the water in the bathtub 26 is detected, in order to increase the temperature of the hot water in the bathtub 26, the hot water mixing valve 28 is fully opened, the heating temperature of the heat pump heat source 35 is increased, and the pump 31 is turned on. It is driven to take out water from the bathtub 26 by the bathtub water extraction pipe 30, mix them, and return them to the bathtub 26. Since the pump 31 is a DC type, the ratio of the flow rate of water from the bathtub 26 to the flow rate from the pouring pipe 27 can be changed by changing its driving force, so that the human body touches the temperature of the pouring temperature detecting means 38. However, pouring is performed by adjusting the driving force of the pump 31 so as not to exceed the upper limit temperature of 60 ° C. which is not dangerous. As a result, the supply temperature from the hot water storage tank 21 is made as high as possible to reduce the amount of hot water supplied to the bathtub 26 as much as possible, and the temperature of the hot water returning to the bathtub 26 is raised to a safe temperature. Can be made. At this time, since the temperature of the water taken out from the bathtub 26 can always be detected by the bathtub water temperature detection means 40 provided in the bathtub water extraction pipe 30, this heating is performed until the detected temperature reaches a predetermined temperature.

  This control will be specifically described with reference to FIG. First, after a user requests a hot water operation with a remote controller (not shown) (step 501), the opening of the hot water mixing valve 28 is fully opened to the hot water supply pipe side (step 502). The hot water valve 29 is opened (step 503), and the pump 31 is driven (step 504). Then, the heat pump heat source 35 is activated (step 505).

  Next, the pouring temperature detecting means 38 measures the temperature of the hot water flowing through the pouring pipe 27 (step 506), and the temperature measured by the pouring temperature detecting means 38 becomes a preset pouring temperature (60 ° C.). Thus, while controlling the pump 31 (step 507), the bath water temperature by the bath water temperature detecting means 40 is detected (step 508).

  The control means determines whether or not the temperature detected by the bath water temperature detection means 40 reaches the bathtub set temperature determined by the user (step 509). If the temperature does not reach the bathtub set temperature, the process returns to step 506 to continue the processing. If the temperature detected by the bath water temperature detecting means 40 has reached the bath set temperature, the heat pump heat source 35 is stopped (step 510), the pouring valve 29 is closed (step 511), and the pump 31 is stopped. (Step 512) and the pouring is finished (step 513).

  In this manner, the water in the bathtub 26 is taken out by the bathtub water extraction pipe 30 connected to the pouring pipe 27 from the bathtub 26 and taken out, mixed with the hot water in the pouring pipe 27, and poured into the bathtub 26. As a result, the temperature of the hot water from the pouring pipe 27 is lowered by the water taken out from the bathtub 26 and poured into the bathtub 26. While the temperature of the hot water supplied from the hot water supply device can be raised, the temperature returning to the bathtub 26 can be kept low, so that the hot water pouring can be performed at a safe temperature while suppressing the increase in the water level of the bathtub 26.

  It should be noted that the present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the scope of the present invention.

(Embodiment 3)
FIG. 6 is a configuration diagram of a hot water supply apparatus according to the third embodiment of the present invention. The same configurations and elements as those of the first embodiment shown in FIG. 1 are denoted by the same names and numbers, and different points will be mainly described.

  As a configuration, the point that differs greatly from the first embodiment is that the heating of the hot water supply apparatus is the fuel cell 41. Moreover, although the hot water storage tank 21 is provided, the bath heating heat exchanger is not provided. Further, the pouring valve 29 is a simple open / close valve, the pump 31 is an AC drive pump, and has a bath heating mixing valve 42 at the connection between the bathtub water extraction pipe 30 and the pouring pipe 27. It is.

  In the hot water supply apparatus configured as described above, differences in operation and action will be described below.

First, an operation during a hot water storage operation in which water in the hot water storage tank 21 is heated by the fuel cell 41 as a heating source to store hot water will be described. The hot water circulation pump 37 provided in the heat pump heat source 35 is driven to supply the water in the lower part of the hot water storage tank 21 to the method heater of the fuel cell 41 by the hot water circulation circuit 36. The fuel cell 41 generates power using hydrogen decomposed and generated from the fuel, and heats it with the waste heat generated at that time, and uses electricity and heat to make a device with high overall energy utilization efficiency from the viewpoint of fuel. Can do. Since it has the hot water storage tank 21 and stores waste heat generated during power generation as high-temperature water, it can be used for hot water supply when necessary, so that it can be used without wasting electricity and heat.

  When hot water or hot water is supplied, the hot water mixing valve 25 and the hot water mixing valve 28 are used to mix hot water and hot water in the hot water storage tank 21 in accordance with the respective temperatures.

  When a drop in the temperature of the water in the bathtub 26 is detected, the hot water mixing valve 28 is fully opened and the hot water valve 29 is opened to increase the temperature of the hot water in the bathtub 26. Supply water. Moreover, the pump 31 is driven and water from the bathtub 26 is taken out by the bathtub water extraction pipe 30. These are mixed at an arbitrary mixing ratio in the bath heating mixing valve 42 and returned to the bathtub 26. The hot water is poured by adjusting the mixing ratio of the bath heating mixing valve 42 so that the temperature of the hot water temperature detecting means 38 does not exceed 60 ° C. which is not dangerous even if the human body touches it. As a result, the supply temperature from the hot water storage tank 21 is made as high as possible to reduce the amount of hot water supplied to the bathtub 26 as much as possible, and the temperature of the hot water returning to the bathtub 26 is raised to a safe temperature. Can be made. At this time, since the temperature of the water taken out from the bathtub 26 can always be detected by the bathtub water temperature detection means 40 provided in the bathtub water extraction pipe 30, this heating is performed until the detected temperature reaches a predetermined temperature.

  In this manner, the water in the bathtub 26 is taken out by the bathtub water extraction pipe 30 connected to the pouring pipe 27 from the bathtub 26 and taken out, mixed with the hot water in the pouring pipe 27, and poured into the bathtub 26. As a result, the temperature of the hot water from the pouring pipe 27 is lowered by the water taken out from the bathtub 26 and poured into the bathtub 26. While the temperature of the hot water supplied from the hot water supply device can be raised, the temperature returning to the bathtub 26 can be kept low, so that the hot water pouring can be performed at a safe temperature while suppressing the increase in the water level of the bathtub 26.

  It should be noted that the present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the scope of the present invention.

  As described above, the hot water supply apparatus according to the present invention takes out the water from the bathtub, mixes it with the hot water in the pouring pipe, and pours it into the bathtub. Lower the temperature of hot water and pour it into the bathtub. Since the temperature returned to the bathtub can be kept low while the temperature of the hot water supplied from the hot water supply device is raised, pouring can be performed while suppressing an increase in the water level of the bathtub at a safe temperature. In addition to the heating source of the hot water supply apparatus mentioned in the embodiment, such a configuration can be used for various things such as a heating source having a combustor made of gas or petroleum, a heating source using solar heat, and the like. .

Circuit diagram of hot water supply apparatus in Embodiment 1 of the present invention Control flow diagram of hot water supply apparatus in Embodiment 1 of the present invention Control flow diagram of hot water supply apparatus in Embodiment 1 of the present invention Circuit diagram of hot water supply apparatus in Embodiment 2 of the present invention Control flow diagram of hot water supply apparatus in Embodiment 2 of the present invention Circuit diagram of hot water supply apparatus in Embodiment 3 of the present invention Circuit diagram of a hot water supply device in a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Hot water tank 26 Bathtub 27 Pouring pipe 29 Pouring valve 30 Bath water extraction pipe 31 Pump 35 Heat pump heat source 38 Pouring temperature detection means 39 Water level detection means 40 Bath water temperature detection means 41 Fuel cell 42 Bath heating mixing valve

Claims (6)

A heating source that heats water into hot water, a bathtub pouring pipe that pours hot water heated by the heating source into the bathtub, a bathtub water extraction pipe that circulates the bathtub water in the bathtub, and the bathtub note A bath-side flow rate adjusting means disposed in the middle of the hot water pipe, and the hot water from the bathtub water take-out pipe flows into the bathtub pouring pipe so that the hot water can be mixed. When the hot water from the bathtub water extraction pipe flows into the bathtub pouring pipe and is mixed with the hot water pipe, the bath pouring pipe is connected by the pouring side flow rate adjusting means according to the temperature of the mixed hot water. A hot water supply device that varies the flow rate. A heating source that heats water to make hot water, a bathtub pouring pipe that pours hot water heated by the heating source into the bathtub, a bathtub water extraction pipe that circulates bathtub water in the bathtub, and the bathtub water A bathtub-side flow rate adjusting means disposed in the middle of the take-out pipe, and the bath water take-out pipe is connected to the bathtub pouring pipe so that hot water from the bath water take-out pipe flows into the bathtub pouring pipe and can be mixed. When the hot water from the bathtub water extraction pipe flows into the bathtub pouring pipe and is mixed with the pipe, the flow rate that flows through the bathtub water extraction pipe by the bathtub-side flow rate adjusting means according to the temperature of the mixed hot water A hot water supply device that can vary. 3. A hot water supply apparatus according to 1 or 2, comprising a hot water storage tank for storing hot water heated by a heating source. The hot-water supply apparatus of any one of Claims 1-3 which used the heat source which heats water as a heat pump. The hot water supply device according to claim 4, wherein the refrigerant circuit of the heat pump is a supercritical refrigerant circuit in which the pressure is equal to or higher than the critical pressure, and water is heated by the refrigerant whose pressure is increased to the critical pressure or higher. The hot water supply apparatus according to any one of claims 1 to 3, wherein a heating source for heating water is a fuel cell.

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