JP2019152373A - Hot water storage type water heater - Google Patents

Abstract

To provide a hot water storage type water heater which can simplify control specification when utilizing medium temperature water in a hot water storage tank.SOLUTION: A hot water storage type water heater includes: a switching valve including a medium temperature inlet which medium temperature water passing a medium temperature pipeline from a hot water storage tank flows in, a low temperature inlet which a low temperature water passing a low temperature pipeline flows in, and a water outlet; and a mixing valve including a hot water side inlet which hot temperature water passing a high temperature pipeline from the hot water storage tank flows in, a water side inlet which water from the water outlet of the switching valve flows in, and a hot water outlet from which hot water in which the high temperature hot water flowing in from the hot water side inlet and water flowing in from the water side inlet are mixed is discharged. The low temperature pipeline, the medium temperature pipeline and the switching valve are constituted in such a manner that a pressure loss of a first path leading to the water side inlet of the mixing valve from a water supply pipeline through the medium temperature pipeline and the switching valve switched to the medium temperature position, becomes the same as a pressure loss of a second path leading to the water side inlet of the mixing valve from the water supply pipeline through the low temperature pipeline and the switching valve switched to the low temperature position.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water storage type hot water supply apparatus including a hot water storage tank for storing high temperature hot water boiled by a heat source.

  Patent Document 1 discloses a technique related to a hot water storage type hot water supply system that uses intermediate temperature water extracted from an intermediate portion of a hot water storage tank for hot water supply. Specifically, this system includes a hot water mixing valve and a three-way valve. The hot water supply mixing valve adjusts the temperature of hot water supplied to the hot water supply destination by mixing high temperature water supplied from a high temperature pipe with low temperature water supplied from a water source or medium temperature water supplied from an intermediate temperature pipe. In addition, the three-way valve switches between an intermediate warm water usage state in which intermediate warm water is supplied to the hot water supply mixing valve and an intermediate warm water non-use state in which low temperature water is supplied to the hot water supply mixing valve.

  According to the technique of Patent Document 1, an increase in the temperature of the low temperature water in the lower part of the hot water storage tank is suppressed by using the medium temperature water in the hot water storage tank. Thereby, the fall of boiling efficiency is prevented. Moreover, the use of high-temperature water can be suppressed by using medium temperature water in the hot water storage tank for hot water supply.

JP 2017-190884 A

  In the technique of the above-mentioned Patent Document 1, the medium warm water usage state and the medium warm water non-use state are switched by switching the three-way valve. In the middle temperature water use state, the water path is different from that in the middle temperature water non-use state. For this reason, in the medium hot water usage state, the characteristics of the actual mixing ratio with respect to the opening degree of the hot water supply mixing valve may be different from those in the case of the medium hot water non-use state. In the control of the hot water supply mixing valve, the temperature of the hot water supplied to the hot water supply destination may be adjusted by calculating the opening degree using the above characteristics. In this case, different calculations are required depending on whether the medium-temperature water is used or the medium-temperature water is not used, which complicates control specifications.

  This invention was made in order to solve the above problems, and it aims at providing the hot water storage type hot water supply apparatus which can simplify the control specification at the time of utilizing the inside temperature water in a hot water storage tank. To do.

  The hot water storage type water heater according to the present invention communicates with a hot water storage tank for storing hot water heated by the heating means, a high-temperature pipe communicating with the upper port of the hot water storage tank, and a hot water storage tank at an intermediate port lower than the upper port. Medium temperature piping, water supply piping that supplies water from the water source to the hot water storage tank, low temperature piping that is lower than the intermediate port or in the middle of the water supply piping, and medium temperature water supplied from the hot water storage tank through the intermediate temperature piping An intermediate temperature inlet through which a low temperature water supplied through a low temperature pipe flows, and a water outlet, an intermediate temperature position where the intermediate temperature inlet communicates with the water outlet, and a low temperature inlet communicates with the water outlet A switching valve capable of switching the flow path to a low temperature position, a hot water inlet through which hot water supplied from a hot water storage tank through high temperature piping flows, and a water inlet through which water from the water outlet of the switching valve flows And the high temperature flowing in from the hot water inlet And a hot water outlet from which hot water mixed with water flowing in from the water side inlet comes out, and a mixing valve capable of adjusting a mixing ratio of high temperature hot water flowing in from the hot water side inlet and water flowing in from the water side inlet, Prepare. Low-temperature piping, medium-temperature piping, and switching valve are switched from the feed water piping to the water-side inlet of the mixing valve through the switching valve switched to the medium-temperature piping and medium-temperature position, and from the water supply piping to the low-temperature piping and low-temperature position The pressure loss of the second path that reaches the water side inlet of the mixing valve through the selected switching valve is equal.

  According to the hot water storage type hot water supply apparatus of the present invention, it is possible to provide a hot water storage type hot water supply apparatus capable of simplifying the control specifications when using the medium temperature water in the hot water storage tank.

It is a figure which shows the structure of the hot water storage type water heater of Embodiment 1. FIG. FIG. 3 is a diagram illustrating a configuration of a mixing valve according to the first embodiment. It is a characteristic view which shows the characteristic of the mixing ratio with respect to the step number which rotates the ball valve body of a mixing valve. FIG. 3 is a circuit configuration diagram of the hot water storage type water heater according to the first embodiment during a hot water storage operation. FIG. 3 is a circuit configuration diagram of the hot water storage type water heater according to the first embodiment during a follow-up operation. 3 is a circuit configuration diagram during a hot water supply operation using a first path of the hot water storage type hot water supply apparatus according to Embodiment 1. FIG. FIG. 3 is a circuit configuration diagram during a hot water supply operation using a second path of the hot water storage type hot water supply apparatus according to the first embodiment. It is a conceptual diagram which shows the internal structure of the 4th flow-path switching valve in a medium temperature water utilization state. It is a conceptual diagram which shows the internal structure of the 4th flow-path switching valve in a medium warm water non-use state. It is a conceptual diagram which shows the internal structure of a coupling part. It is a figure which shows the modification of a structure of the hot water storage type water heater of Embodiment 1. FIG.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted. The present disclosure may include all combinations of configurations that can be combined among the configurations described in the following embodiments.

Embodiment 1 FIG.
1. Configuration of Hot Water Storage Type Water Heater FIG. 1 is a diagram showing a configuration of a hot water storage type hot water heater according to the first embodiment. In the figure, lead wires for connecting the control unit and each functional component are omitted. The hot water storage type water heater 1 according to the first embodiment includes a hot water storage unit 100 and a heat pump unit 200 as a heating means. Hot water storage unit 100 is connected to heat pump unit 200 via pipes 103 and 131 and electrical wiring (not shown). The hot water storage unit 100 is connected to the bathtub 300 via pipes 145 and 146.

  The hot water storage type hot water heater 1 according to the first embodiment stores the hot water boiled by the heat pump unit 200 in the hot water storage tank 101 in the hot water storage unit 100. Inside the hot water storage tank 101, a temperature stratification can be formed in which the upper layer side is hot and the lower layer side is cold due to the density difference due to temperature. The hot water stored in the hot water storage tank 101 is supplied to hot water supply terminals such as a kitchen or a bathroom faucet, a shower, and a bathtub 300, for example.

  In the hot water storage unit 100, in addition to the hot water storage tank 101, a follow-up heat exchanger 121, a first flow path switching valve 105, a second flow path switching valve 108, a third flow path switching valve 127, a fourth flow path switching valve 161. Further, a heat source circulation pump 129, a bath circulation pump 124, a hot water supply mixing valve 115a, a bath mixing valve 115b, a control unit 102, and pipes for connecting these devices are further incorporated. The follow-up heat exchanger 121 is for heating the bath water by exchanging heat between the heat source water supplied from the hot water storage tank 101 and the bath water circulating from the bathtub 300. The heat source circulation pump 129 is for circulating hot water such as heat source water. The bath circulation pump 124 is for circulating bath water. The hot water mixing valve 115a and the bath mixing valve 115b are a mixture ratio of high temperature water supplied from the upper part of the hot water storage tank 101 and low temperature water supplied from the water supply pipe 139 and the low temperature pipe 141 or medium temperature water supplied from the intermediate temperature pipe 112. It is configured to be adjustable. In the following description, when the hot water mixing valve 115a and the bath mixing valve 115b are not particularly distinguished, they are simply referred to as “mixing valve 115”.

  The first flow path switching valve 105 is a flow path switching means having a b port and a d port as inlets, and an a port and a c port as outlets. The second flow path switching valve 108 is a flow path switching means having an f port as an inlet and e ports, g ports, and h ports as outlets. The third flow path switching valve 127 is a flow path switching means having an i port and a k port as inlets and a j port as an outlet. The fourth flow path switching valve 161 is a flow path switching means having an m port and an n port as inlets and an l port as an outlet.

  Although the detailed illustration is omitted, the heat pump unit 200 is equipped with a refrigeration cycle capable of absorbing the heat of air and heating the water into hot water. Specifically, the heat pump unit 200 includes an inflow port 206 and an outflow port 205 that serve as inlets and outlets of hot water, a heating heat exchanger 203 that performs heat exchange between the high-temperature refrigerant and hot water, and an inlet 206 that is used for heating up. Operation of a pipe 202 connecting the heat exchanger 203, a pipe 204 connecting the outlet 205 and the heating heat exchanger 203, and a compressor, an expansion valve, a blower fan, etc. (not shown) constituting the refrigeration cycle. And a control unit 201 for controlling. The control unit 201 is communicably connected to the control unit 102 in the hot water storage unit 100.

  The bathtub 300 is provided with a bathtub adapter 301. One end of each of the pipes 145 and 146 is connected to the bathtub adapter 301. The other end of the pipe 145 is connected to the bath return port 152 of the hot water storage unit 100. The other end of the pipe 146 is connected to the bath outlet 153 of the hot water storage unit 100.

  The hot water storage tank 101 is provided with a plurality of hot water outlets. In the upper region of the hot water storage tank 101, a first upper port 101a and a second upper port 101b are provided. In the lower region of the hot water storage tank 101, a first lower port 101c, a second lower port 101d, and a water inlet 101e are provided. A first intermediate port 101f and a second intermediate port 101g are provided in an intermediate region located lower than the upper region of the hot water storage tank 101 and higher than the lower region.

  A first temperature sensor 164 and a second temperature sensor 165 are provided on the outer surface of the hot water storage tank 101. The first temperature sensor 164 is disposed in the middle region of the hot water storage tank 101, and the second temperature sensor 165 is disposed in the upper region of the hot water storage tank 101. The first temperature sensor 164 and the second temperature sensor 165 detect the water temperature at each position.

  Next, the valves and piping provided in the hot water storage unit 100 will be described. The upstream of the water supply pipe 139 is connected to a water supply port 151 drawn from a water source. A third temperature sensor 163 is provided in the middle of the water supply pipe 139. The third temperature sensor 163 detects the temperature of the low-temperature water supplied from the water source. A downstream side of the water supply pipe 139 branches into a water supply pipe 138 and a low temperature pipe 141. The water supply pipe 138 is connected to the water inlet 101 e of the hot water storage tank 101. The low temperature water supplied from the water source flows into the water inlet 101e of the hot water storage tank 101 from the water supply pipe 138, whereby the hot water storage tank 101 is maintained in a full state.

  The upstream of the pipe 134 is connected to the first lower port 101 c of the hot water storage tank 101. A downstream of the pipe 134 is connected to a drain plug 135. The drain plug 135 is connected to the drain port 149 by a pipe 137. During normal use, the hot water storage tank 101 is always kept full of hot water. However, the drain plug 135 is opened in an emergency when the hot water in the hot water storage tank 101 needs to be drained. Thereby, the hot water in the hot water storage tank 101 is drained from the drain port 149 via the pipe 134, the drain plug 135, and the pipe 137.

  The pipe 136 connects the drain plug 135 and the i port of the third flow path switching valve 127. The pipe 128 connects the j port of the third flow path switching valve 127 and the suction port of the heat source circulation pump 129. The pipe 130 connects the discharge port of the heat source circulation pump 129 and the HP going-out port 148. The pipe 131 connects the HP outlet 148 and the inlet 206 of the heat pump unit 200. The pipe 103 connects the outlet 205 of the heat pump unit 200 and the HP return port 147. The pipe 104 connects the HP return port 147 and the b port of the first flow path switching valve 105. The pipe 106 connects the a port of the first flow path switching valve 105 and the f port of the second flow path switching valve 108. The pipe 132 branches from the middle of the pipe 130 and is connected to the d port of the first flow path switching valve 105. The pipe 133 connects the c port of the first flow path switching valve 105 and the second lower port 101 d of the hot water storage tank 101.

  The pipe 107 connects the h port of the second flow path switching valve 108 and the second intermediate port 101 g of the hot water storage tank 101. The pipe 110 connects the e port of the second flow path switching valve 108 and the inlet of the heat source water of the follow-up heat exchanger 121. The pipe 126 connects the outlet of the heat source water of the follow-up heat exchanger 121 and the k port of the third flow path switching valve 127. The piping 111 connects the second upper port 101 b of the hot water storage tank 101 and the middle of the piping 110. The high temperature pipe 113 connects the first upper port 101a of the hot water storage tank 101 and the B port which is the hot water side inlet of the hot water mixing valve 115a and the bath mixing valve 115b. The pipe 109 connects the g port of the second flow path switching valve 108 and the middle of the high temperature pipe 113.

  The water supply pipe 139 connects the water supply port 151 and the upstream side of the pressure reducing valve 140. The low temperature pipe 141 connects the downstream side of the pressure reducing valve 140 and the n port of the fourth flow path switching valve 161. The water supply pipe 138 connects the middle of the low temperature pipe 141 and the water inlet 101 e of the hot water storage tank 101. The intermediate temperature pipe 112 connects the m port of the fourth flow path switching valve 161 and the first intermediate port 101 f of the hot water storage tank 101. The pipe 162 connects the l port of the fourth flow path switching valve 161 and the A port that is the water side inlet of the hot water supply mixing valve 115a and the bath mixing valve 115b. The pipe 144 connects the C port that is the hot water outlet of the hot water mixing valve 115 a and the hot water supply port 150.

  FIG. 2 is a diagram illustrating a configuration of the mixing valve 115 according to the first embodiment. As shown in this figure, the mixing valve 115 is configured as a ball valve having a rotatable ball valve body 171 and a body 172.

  FIG. 3 is a characteristic diagram showing the characteristics of the mixing ratio with respect to the number of steps for rotating the ball valve body 171 of the mixing valve 115. The characteristic shown in this figure is an example when the position of the ball valve body 171 when the A port of the mixing valve 115 is fully open is set to 0 step, and the ball valve body 171 is rotated 90 ° in 1000 steps. In the characteristics shown in this figure, when the number of steps is 0, the mixing ratio of low-temperature water flowing from the A port to the C port is 100%, and the mixing ratio of hot water flowing from the B port to the C port is 0%. . As the number of steps increases, the mixing ratio of water flowing from the A port to the C port decreases, and the mixing ratio of hot water flowing from the B port to the C port increases. When the number of steps is 1000, the mixing ratio of hot water flowing from the B port to the C port is 100%, and the mixing ratio of water flowing from the A port to the C port is 0%. As described above, in the mixing valve 115, the ball valve body 171 rotates and moves, whereby the mixing ratio of hot water and water gradually changes.

  In the middle of the low-temperature pipe 141, a fluid resistance unit 180 that provides pressure loss to the low-temperature water flowing through the low-temperature pipe 141 is installed. In addition, a joint portion 181 for joining a plurality of pipe portions constituting the low temperature pipe 141 is installed in the middle of the low temperature pipe 141. Details of the configurations of the fluid resistance portion 180 and the joint portion 181 will be described later.

  The l port, m port, and n port of the fourth flow path switching valve 161 function as a water outlet, a medium temperature inlet, and a low temperature inlet, respectively. The intermediate temperature water supplied from the first intermediate port 101 f of the hot water storage tank 101 through the intermediate temperature pipe 112 flows into the m port of the fourth flow path switching valve 161. Low temperature water having a temperature lower than that of the medium temperature water flows into the n port of the fourth flow path switching valve 161. In the present embodiment, low temperature water supplied from the water supply port 151 through the water supply pipe 139 and the low temperature pipe 141 flows into the n port of the fourth flow path switching valve 161. The fourth flow path switching valve 161 can switch the flow path between an “intermediate temperature position” and a “low temperature position”. In the “low temperature position”, the n port that is the low temperature inlet communicates with the l port that is the water outlet, and the m port that is the intermediate temperature inlet is blocked. At the “low temperature position”, low temperature water from the low temperature pipe 141 flows to the pipe 162. In the following description, a path flowing from the water supply pipe 139 through the low temperature pipe 141 to the A port of the mixing valve 115 is referred to as a “first path”.

  On the other hand, in the “medium temperature position”, the m port that is the medium temperature inlet communicates with the l port that is the water outlet, and the n port that is the low temperature inlet is blocked. At the “medium temperature position”, the medium temperature water from the medium temperature pipe 112 flows to the pipe 162. In the following description, a path that flows from the water supply pipe 139 through the intermediate temperature pipe 112 to the A port of the mixing valve 115 is referred to as a “second path”.

  The hot water mixing valve 115 a mixes high temperature hot water supplied from the hot water storage tank 101 through the high temperature pipe 113 and water from the l port of the fourth flow path switching valve 161 to adjust the temperature. The hot water whose temperature has been adjusted flows into the pipe 144. Hot water passing through the pipe 144 is supplied from the hot water supply port 150 to a faucet, a shower, and the like.

  The bath mixing valve 115b mixes high temperature hot water supplied from the hot water storage tank 101 through the high temperature pipe 113 and water from the l port of the fourth flow path switching valve 161 to adjust the temperature. The hot water whose temperature has been adjusted flows into the pipe 119. Hot water passing through the pipe 119 is supplied from the pipe 120 and the pipe 125 to the bathtub 300.

  The hot water storage type water heater 1 of the present embodiment includes a control unit 102 as control means. The control unit 102 is electrically connected to the control unit 201, each actuator, and each sensor described above. The operation of the hot water storage type water heater is controlled by the control unit 102.

2. Hot water storage operation using a hot water storage type water heater The hot water storage type water heater 1 according to the present embodiment can execute a hot water storage operation in which hot water heated by the heat pump unit 200 flows into the hot water storage tank 101. FIG. 4 is a circuit configuration diagram of the hot water storage type water heater according to the first embodiment during a hot water storage operation. In hot water storage operation:

  The heat pump unit 200 and the heat source circulation pump 129 are operated. The water taken out from the first lower port 101c of the hot water storage tank 101 is supplied with the pipe 134, the drain plug 135, the pipe 136, the third flow path switching valve 127, the pipe 128, the heat source circulation pump 129, the pipe 130, and the HP outlet 148. And through the pipe 131 from the inlet 206 into the heat pump unit 200. The hot water heated in the heat pump unit 200 flows from the outlet 205 to the pipe 103, the HP return port 147, the pipe 104, the first flow path switching valve 105, the pipe 106, the second flow path switching valve 108, the pipe 110, and It flows into the hot water storage tank 101 from the second upper port 101b through the pipe 111. The hot water storage operation is typically performed mainly in the late-night power hours, and the hot water used for the next day is stored in the hot water storage tank 101.

3. Follow-up operation by hot water storage type hot water supply system The hot water storage type hot water supply apparatus 1 of the present embodiment heats the bath water in the bathtub 300 using the hot water stored in the hot water storage tank 101 by the hot water storage operation as a heat source water. Follow-up driving can be executed. FIG. 5 is a circuit configuration diagram of the hot water storage type water heater according to the first embodiment during a follow-up operation. In chasing driving, it is as follows.

  In the follow-up operation, the heat source circulation pump 129 and the bath circulation pump 124 are operated. As a result, the high-temperature water flowing out from the second upper port 101 b of the hot water storage tank 101 is led to the follow-up heat exchanger 121 through the pipe 111 and the pipe 110. On the other hand, in the path on the bathtub 300 side, by operating the bath circulation pump 124, the bath water stretched on the bathtub 300 is converted into the pipe 145, the bath return port 152, the pipe 125, the follow-up heat exchanger 121, the pipe 120, It circulates through a circulation circuit composed of the bath outlet 153 and the pipe 146. In the follow-up heat exchanger 121, the heat of the high-temperature heat source water is transmitted to the bath water. As a result, the heat source water becomes medium temperature water and the bath water is warmed. The medium temperature water led out from the follow-up heat exchanger 121 is pipe 126, third flow path switching valve 127, pipe 128, heat source circulation pump 129, pipe 132, first flow path switching valve 105, pipe 106, second flow path. It returns to the hot water storage tank 101 from the second intermediate port 101 g through the switching valve 108 and the pipe 107. This chasing operation is configured to be automatically performed by the control unit 102 or arbitrarily performed by the user by detecting the temperature drop of the bath water stretched on the bathtub 300 with a temperature sensor.

4. Hot-water supply operation by a hot-water storage type hot-water supply device The hot-water storage-type hot water supply device 1 of the present embodiment can execute a hot-water supply operation in which hot water having a set temperature is supplied to the hot water supply port 150 or the bathtub 300. In the hot water supply operation, when the hot water flow rate sensor 143 detects a water flow, the control unit 102 controls the hot water mixing valve 115a so that the temperature of the hot water flowing from the hot water outlet of the hot water mixing valve 115a to the pipe 144 becomes the hot water supply set temperature. Adjust the mixing ratio. Further, when the bath temperature sensor 118 detects the water flow, the controller 102 mixes at the bath mixing valve 115b so that the temperature of the hot water flowing from the hot water outlet of the bath mixing valve 115b to the pipe 119 becomes the hot water setting temperature. Adjust the ratio.

  Here, in the hot water supply operation, the hot water supply operation using the first route and the hot water supply operation using the second route can be switched by operating the fourth flow path switching valve 161. FIG. 6 is a circuit configuration diagram at the time of a hot water supply operation using the first path of the hot water storage type hot water heater of the first embodiment. 6 illustrates a hot water supply operation in which the hot water supply port 150 is a hot water supply destination. In the hot water supply operation using the first path, when the fourth flow path switching valve 161 is set to the “low temperature position”, the low temperature water flowing out from the water supply port 151 to the water supply pipe 139 and the low temperature pipe 141 and the hot water storage tank 101 Hot water from the first upper port 101a is mixed by the hot water supply mixing valve 115a. The mixed hot water is supplied to the hot water supply port 150 through the pipe 144 and used for hot water supply. If it is a low temperature water hot water supply operation, a hot water supply operation corresponding to a wide range of set temperatures can be performed. In the following description, the state in which the hot water supply operation using the first route is executed is referred to as “medium hot water non-use state”.

  Specifically, when the medium-temperature water is not used, the opening degree of the hot water supply mixing valve 115a is adjusted based on the following equation (1). In Equation (1), Str represents the opening degree of the hot water supply mixing valve 115a, Ts represents the hot water supply set temperature, Th represents the high temperature water temperature detected by the second temperature sensor 165, and Tw represents the third temperature. The low temperature water temperature detected by the sensor 163 is shown. Further, α and γ are variables for adjusting the pressure balance between the A port and the B port of the hot water mixing valve 115a in a state where the medium-temperature water is not used.

  Str = (Ts−Tw) / (Th−Tw) × α + γ (1)

  FIG. 7 is a circuit configuration diagram at the time of a hot water supply operation using the second path of the hot water storage type water heater of the first embodiment. 7 illustrates a hot water supply operation in which the hot water supply port 150 is a hot water supply destination. In the hot water supply operation using the second path, when the fourth flow path switching valve 161 is set to the “intermediate temperature position”, the intermediate temperature water flowing out from the first intermediate port 101f of the hot water storage tank 101 to the intermediate temperature piping 112, and the hot water storage tank The hot water from the first upper port 101a of 101 is mixed by the hot water supply mixing valve 115a. The mixed hot water is supplied to the hot water supply port 150 through the pipe 144 and used for hot water supply. When the chasing operation is performed, the amount of medium temperature water in the hot water storage tank 101 increases. According to the present embodiment, since the medium temperature water flowing out from the hot water storage tank 101 to the intermediate temperature pipe 112 can be used for hot water supply, the amount of medium temperature water in the hot water storage tank 101 can be reduced. For this reason, the temperature of water entering the heat pump unit 200 can be lowered, and the operating efficiency of the heat pump unit 200 can be improved. In the following description, the state in which the hot water supply operation using the second route is executed is referred to as “medium hot water use state”.

  Specifically, in the medium hot water usage state, the opening degree of the hot water supply mixing valve 115a is adjusted based on the following equation (2). In Equation (2), Str represents the opening degree of the hot water supply mixing valve 115a, Ts represents the hot water supply set temperature, Th represents the high temperature water temperature detected by the second temperature sensor 165, and Tm represents the first temperature. The intermediate hot water temperature detected by the sensor 164 is shown. Β and σ are variables for adjusting the pressure balance between the A port and the B port of the hot-water supply mixing valve 115a when the medium-temperature water is used.

  Str = (Ts−Tm) / (Th−Tm) × β + σ (2)

  Here, when the temperature of the medium temperature water becomes high in the state of using the medium temperature water, even if the mixing ratio with the high temperature hot water supplied through the high temperature pipe 113 is adjusted, there is a case where hot water having a set temperature cannot be generated. Therefore, the control unit 102 switches the route in the hot water supply operation based on the temperature of the medium temperature water detected by the first temperature sensor 164. Specifically, the control unit 102 sets the flow path of the fourth flow path switching valve 161 to the intermediate temperature position when the detected temperature of the intermediate temperature water becomes equal to or higher than a predetermined reference temperature in the intermediate temperature water use state. Switch from low to cold. As a result, the route during the hot water supply operation is switched from the second route to the first route, and the medium hot water use state is switched to the medium hot water non-use state. Thereby, since the temperature of the water supplied to the water side inlet of the mixing valve 115 can be lowered, hot water having a wide set temperature can be generated.

  In addition, the reference temperature at the time of switching the 4th flow-path switching valve 161 uses a predetermined value as the temperature of the middle temperature water which can produce | generate the hot water of a wide setting temperature. Note that the lower the set temperature, the lower the upper limit of the temperature of the medium temperature water that can generate hot water at the set temperature. Moreover, the upper limit of the temperature of the medium temperature water which can produce | generate the hot water of preset temperature becomes low, so that the temperature of the high temperature hot water mixed with medium temperature water is high. Therefore, the reference temperature may be varied according to the set temperature or the temperature of the hot water detected by the second temperature sensor 165.

5. Features of the present embodiment Next, features of the present embodiment will be described. In the hot water storage type water heater 1 of the present embodiment, switching between the intermediate hot water use state and the intermediate hot water non-use state is performed based on the temperature of the intermediate warm water detected by the first temperature sensor 164. Here, the first route used in the non-use state of the intermediate warm water and the second route used in the use state of the intermediate warm water are routes that circulate from the water supply pipe 139 to the water side inlet of the mixing valve 115. Different. If there is a difference in pressure loss between these paths, there will be a difference in the pressure balance between the A port and B port of the mixing valve 115 for each path. In this case, it is necessary to individually set the variables α and γ in the above equation (1) and the variables β and σ in the above equation (2), which complicates the control specifications and increases the development load.

  In the hot water storage type water heater according to the first embodiment, the above-described problem is solved by the configuration of the fluid resistance unit 180. That is, the fluid resistance unit 180 has a structure that gives pressure loss to the low-temperature water flowing through the low-temperature pipe 141. Such a structure can be realized, for example, by a diaphragm structure that narrows the inner diameter. The fluid resistance unit 180 determines the degree of throttling of the throttling structure so that the pressure loss of the first path used in the medium hot water non-use state and the second path used in the medium hot water use state are equal. Has been. Whether or not the pressure loss in the first path and the second path is the same can also be determined by whether or not the pressure at the A port of the mixing valve 115 is the same in the medium hot water usage state and the medium hot water non-use state. . According to such a structure of the fluid resistance unit 180, the common variable in the above equation (1) used when the medium hot water is not used and the above equation (2) used when the medium hot water is used. Can be used. Thereby, the relationship between the valve opening degree of the mixing valve 115 and the actual mixing ratio is constant regardless of the switching by the fourth flow path switching valve 161. Thereby, simplification of the control specification at the time of using the medium temperature water in the hot water storage tank can be achieved, and the development load required for adaptation of variables can be reduced.

6. Modification of Fluid Resistance Portion The structure of the fluid resistance portion 180 is not limited to the structure provided with the above-described throttle structure. That is, the fluid resistance portion 180 is not limited in its arrangement and structure as long as it provides pressure loss so that the pressure loss in the first path and the second path are equal. In the hot water storage type hot water heater 1 according to the first embodiment, for example, a fluid resistance unit 180 configured as follows can be employed.

  The fluid resistance unit 180 may further include a check valve structure that inhibits the flow of fluid from the fourth flow path switching valve 161 toward the water supply pipe 139. Accordingly, the fluid resistance unit 180 can perform a function of preventing a back flow from the n port of the fourth flow path switching valve 161 to the water supply pipe 139 in addition to the function of adjusting the pressure loss.

  The fluid resistance unit 180 may be configured as a low temperature pipe 141 having a smaller diameter than the inner diameter of the medium temperature pipe 112. In this case, the inner diameters of the intermediate temperature pipe 112 and the low temperature pipe 141 may be determined so that the pressure losses in the first path and the second path are equal.

  The fluid resistance unit 180 may be configured inside the fourth flow path switching valve 161. FIG. 8 is a conceptual diagram showing the internal structure of the fourth flow path switching valve 161 when the medium-temperature water is used. FIG. 9 is a conceptual diagram showing the internal structure of the fourth flow path switching valve 161 in a state where the medium-temperature water is not used. As shown in FIGS. 8 and 9, the fourth flow path switching valve 161 is configured as a ball valve having a rotatable ball valve body 173 and a body 174. The ball valve body 173 is formed with an intermediate temperature channel 175 that allows communication between the m port and the l port when the intermediate temperature water is used. Further, the ball valve body 173 is formed with a low-temperature flow path 176 that communicates the n-port and the l-port when the medium-temperature water is not used. The low-temperature channel 176 is provided with a fluid resistance unit 180 whose inner diameter is narrower than that of the medium-temperature channel 175. What is necessary is just to determine the internal diameter in the fluid resistance part 180 to the value from which the pressure loss of a 1st path | route and a 2nd path | route becomes equivalent. According to such a configuration, the pressure loss in the first path and the second path can be made equal without providing the fluid resistance portion 180 in the low-temperature pipe 141. Thereby, the number of parts can be reduced and the configuration of the apparatus can be simplified.

  The fluid resistance portion 180 may be configured inside the joint portion 181. FIG. 10 is a conceptual diagram showing the internal structure of the joint. The joint part 181 is for joining one or a plurality of pipe parts constituting the low-temperature pipe 141. The joint portion 181 can be used not only for joining the piping portions of the low-temperature piping 141 but also for joining the piping portion and the valve. As shown in this figure, the joint portion 181 includes a fluid resistance portion 180 having a smaller inner diameter than the piping portion in a part thereof. What is necessary is just to determine the internal diameter in the fluid resistance part 180 to the value from which the pressure loss of a 1st path | route and a 2nd path | route becomes equivalent. According to such a configuration, the pressure loss of the first path and the second path can be equalized without installing a dedicated component for imparting pressure loss. Thereby, the number of parts can be reduced and the configuration of the apparatus can be simplified.

  The fluid resistance unit 180 may have a configuration in which the above-described modifications are employed alone, or may be configured in combination with these modifications.

7. Modified example of hot water storage type water heater The hot water storage type water heater 1 of the first embodiment may adopt a modified form as follows.

  FIG. 11 is a diagram illustrating a modification of the configuration of the hot water storage type hot water supply apparatus according to the first embodiment. In the hot water storage type hot water heater 1 of the modification shown in this figure, the low temperature pipe 141 is shown in FIG. 1 except that the n port of the fourth flow path switching valve 161 communicates with the third lower port 101h of the hot water storage tank 101. The hot water storage type hot water heater 1 shown in FIG. According to the hot water storage type hot water heater 1 shown in FIG. 11, the first path is from the water supply port 151 through the water supply pipe 139, the third lower port 101 h of the hot water storage tank 101, the low temperature pipe 141, and the pipe 162. Configured as a route to the port. In this case, the first route and the second route are all common except for the route of the low temperature pipe 141 and the medium temperature pipe 112. According to such a configuration, it becomes easy to equalize the pressure loss of the first path and the second path.

DESCRIPTION OF SYMBOLS 1 Hot water storage type water heater, 100 Hot water storage unit, 101 Hot water storage tank, 101a First upper port, 101b Second upper port, 101c First lower port, 101d Second lower port, 101e Water inlet, 101f First intermediate port, 101g Second intermediate port, 102 control unit, 103, 104, 106, 107, 109, 110, 111, 119, 120, 125, 126, 128, 130, 131, 132, 133, 134, 136, 137, 144, 145 , 146, 162, 202, 204 piping, 105 first flow switching valve, 108 second flow switching valve, 112 medium temperature piping, 113 high temperature piping, 115 mixing valve, 115a hot water mixing valve, 115b bath mixing valve, 118 for bath Temperature sensor, 121 follow-up heat exchanger, 124 bath circulation pump, 127 Third flow path switching valve, 129 Heat source circulation pump, 135 Drain plug, 138, 139 Water supply pipe, 141 Low temperature pipe, 140 Pressure reducing valve, 143 Hot water flow sensor, 147 HP return port, 148 HP forward port, 149 Drain port , 150 Hot water inlet, 151 Water inlet, 152 Bath return port, 153 Bath outlet, 161 Fourth flow path switching valve, 164 First temperature sensor, 165 Second temperature sensor, 171 Ball valve body, 172 Body, 173 Ball valve Body, 174 body, 180 fluid resistance part, 181 joint part, 200 heat pump unit, 201 control part, 203 heat exchanger for boiling, 205 outlet, 206 inlet, 300 bathtub, 301 bathtub adapter

Claims (10)

A hot water storage tank for storing hot water heated by the heating means;
High-temperature piping communicating with the upper port of the hot water storage tank;
An intermediate temperature pipe communicating with the hot water storage tank at an intermediate port lower than the upper port;
A water supply pipe for supplying water from the water source to the hot water storage tank;
A lower temperature port lower than the intermediate port or a low temperature pipe communicating in the middle of the water supply pipe,
The intermediate temperature inlet has an intermediate temperature inlet into which intermediate temperature water supplied from the hot water storage tank through the intermediate temperature pipe flows, a low temperature inlet into which low temperature water supplied through the low temperature pipe flows, and a water outlet. A switching valve capable of switching the flow path between an intermediate temperature position for communicating with the water outlet and a low temperature position for communicating the low temperature inlet with the water outlet;
A hot water inlet through which hot water supplied from the hot water tank through the high temperature pipe flows, a water inlet through which water from the water outlet of the switching valve flows, and a hot water flowing from the hot water inlet. And a hot water outlet from which hot water mixed with water flowing in from the water side inlet comes out, and a mixing valve capable of adjusting a mixing ratio of high temperature hot water flowing in from the hot water side inlet and water flowing in from the water side inlet And comprising
The low temperature pipe, the medium temperature pipe and the switching valve are:
A first path from the water supply pipe to the intermediate temperature pipe and the switching valve switched to the intermediate temperature position to the water side inlet of the mixing valve, and from the water supply pipe to the low temperature pipe and the low temperature position. Further, the hot water storage type hot water heater is configured so that the pressure loss is equal to that of the second path that reaches the water side inlet of the mixing valve through the switching valve.   The low temperature pipe, the intermediate temperature pipe, and the switching valve are configured such that the relationship between the opening of the mixing valve and the mixing ratio is constant regardless of the switching of the flow path by the switching valve. The hot water storage type water heater according to claim 1, wherein Comprising a fluid resistance section that imparts pressure loss in the middle of the low-temperature piping;
3. The hot water storage type hot water supply device according to claim 1, wherein the fluid resistance portion is configured such that pressure losses in the first path and the second path are equal. 4.   The hot water storage type hot water heater according to claim 3, wherein the fluid resistance portion includes a check valve structure that inhibits a flow of fluid from the switching valve toward the water supply pipe.   The hot water storage type hot-water supply device according to claim 3 or 4, wherein the fluid resistance portion includes a throttle structure that narrows an inner diameter. The low temperature piping is
A piping section;
A joint part for joining the pipe parts,
The joint portion includes a portion having a smaller diameter than the piping portion,
The hot water storage type hot water supply apparatus according to any one of claims 3 to 5, wherein the fluid resistance portion includes the joint portion. The low temperature pipe has an inner diameter smaller than that of the medium temperature pipe,
The hot water storage type hot water heater according to any one of claims 3 to 6, wherein the fluid resistance portion includes the low temperature pipe.   In the switching valve, the pressure loss of the low temperature channel from the low temperature inlet to the water outlet at the low temperature position is larger than the pressure loss of the medium temperature channel from the medium temperature inlet to the water outlet at the medium temperature position. It is comprised so that it may become. The hot water storage type water heater of Claim 1 or Claim 2 characterized by the above-mentioned. The switching valve is configured as a valve having a rotatable ball valve body,
The ball valve body includes the low-temperature channel and the medium-temperature channel inside,
The hot water storage type hot water heater according to claim 8, wherein the low-temperature channel includes a channel having a smaller diameter than an inner diameter of the medium-temperature channel. The low-temperature pipe is configured to communicate with the lower port,
The hot water storage type water heater according to claim 1 or 2, wherein the low-temperature pipe and the intermediate-temperature pipe are configured to have the same pressure loss.

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