JP4444170B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus.

Conventionally, since this type of hot water storage type hot water supply device supplies hot water to a terminal such as a caran and a bathtub, the outlet pipe connected to the upper part of the hot water storage tank is required to have a flow path for supplying hot water to the caran and a large amount of hot water supply. It was branched to a flow path for supplying hot water to the bathtub. Further, before hot water is supplied to the currant or the bathtub, the temperature is adjusted by mixing an appropriate amount of tap water so that the temperature is arbitrarily set by the user (for example, see Patent Document 1).
JP-A-2005-49065

  By the way, in the above configuration, if water is supplied to the bathtub during hot water supply to the currant side, a large amount of hot water flows to the bath terminal side, and the amount of hot water supplied to the currant side is temporarily reduced. Further, since the flow rate of tap water mixed on the currant side is relatively increased in conjunction with it, the tap water flows back to the hot water side and the hot water cannot be supplied.

  This invention solves such a problem, and when hot water supply to the bath terminal side is performed during hot water supply to the currant side, it prevents the backflow of tap water, and aims at the comfort of hot water supply. Objective.

  In order to solve the above-described conventional problems, the hot water storage type hot water supply apparatus of the present invention has a flow point from the bath terminal side to the currant side as a starting point, with a flow path branch point on the outlet pipe branched to the currant side or the bath terminal side. The road resistance is reduced.

  According to the above invention, even when water is supplied to the bath terminal side during hot water supply to the currant side, the amount of decrease in the amount of hot water supplied to the currant side is reduced and the backflow of tap water is alleviated, Comfortable hot water operation can be provided.

  The hot water storage type hot water supply apparatus of the present invention, when water is supplied to the bath terminal side during hot water supply to the currant side, the amount of decrease in hot water supply to the currant side is reduced, and the back flow of tap water is alleviated, Comfortable hot water operation can be provided.

According to a first aspect of the present invention, hot water heated using a heat pump circuit is stored in a stratified state from the upper part of the hot water storage tank, and the hot water is discharged from a hot water outlet pipe provided at the upper part of the hot water storage tank to be desired on the curran side or the bath terminal side. a hot water storage type hot water supply device for supplying hot water, the the medium-temperature hot water pipe to take out hot water from the substantially middle portion of the hot water storage tank, a first mixing valve for mixing hot water from the medium-temperature hot water pipe and the hot water pipe, wherein A hot water mixing valve that mixes hot water mixed with the first mixing valve and tap water and supplies hot water to Karan, and hot water mixed with the first mixing valve and tap water are mixed to hot water to the bath terminal. A hot water flowing out from the first mixing valve to the currant side or the bath terminal side. smaller Then bet the flow path resistance In addition, a check valve is provided on the inlet side of the hot water mixing valve and the bath mixing valve on the side where hot water mixed by the first mixing valve flows, and the hot water flow in the hot water supply direction of the check valve is a predetermined amount. The check valve has a water stop function that does not allow hot water to flow when it is below, and the hot water supply mixing valve and the bath mixing valve out of the first mixing port until the hot water supply is required. The side into which hot water mixed with the valve flows is closed.

In the hot water storage tank, hot water heated by the heat pump circuit is stored in a stratified state from the upper part of the hot water storage tank, so there is hot water in the upper part of the hot water tank, and about 35 to 60 degrees in the middle part. Medium temperature hot water that is an intermediate temperature is stored. These medium-temperature hot water deteriorates the boiling efficiency (COP efficiency) of the heat pump and lowers the efficiency of the boiling operation, so boiling hot water discharged from the upper part of the hot water storage tank by mixing it with the medium-temperature hot water. Medium temperature hot water that deteriorates the raising efficiency (COP efficiency) can be effectively used for hot water supply. However, there is a problem that the amount of mixed hot water is difficult to stabilize because the hot water has a characteristic that the temperature rise is severe. Therefore, when water supply to the bath terminal side is performed during hot water supply to the currant side, the balance of the divided flow rate of hot water is particularly lost, and the amount of hot water supply to the currant side is greatly increased.

  Therefore, in the configuration in which the hot water flowing out from the first mixing valve is divided, even when water is supplied to the bath terminal side during hot water supply to the currant side, the amount of decrease in the amount of hot water supplied to the currant side is reduced. As a result, the backflow of tap water is alleviated and a comfortable hot water supply operation can be provided.

Further, a check valve for stopping the hot water flow in the direction opposite to the hot water supply direction is provided on the hot water discharge pipe from the flow path branch point to the currant side. As a result, even when water is supplied to the bath terminal while hot water is supplied to the currant, the decrease in the amount of hot water supplied to the currant can be reduced and the backflow of tap water can be completely blocked. is there.

In addition, since it has a water stop function when the hot water flow in the hot water supply direction is less than a predetermined amount, high temperature hot water over the set temperature is not discharged when a small amount of hot water is requested. Can be provided.

In addition, a check valve having a water stop function and a check function when the hot water flow in the hot water supply direction is equal to or less than a predetermined amount is provided on the hot water discharge pipe from the flow path branch point to the bath terminal side. Thereby, tap water does not flow backward from the bath terminal side during hot water supply to the bath terminal side.

Since the 2nd invention made the piping diameter of the tapping pipe from the flow path branch point to the currant side longer than the piping diameter of the tapping pipe from the flow path branch point to the bath terminal side in the first invention , in particular , The flow resistance to the currant side is smaller than the bath terminal side, and even if water is supplied to the bath terminal side during hot water supply to the currant side, the amount of decrease in hot water supply to the currant side is reduced. It is reduced .

In the third invention , particularly in the first or second invention , the water stop function of the check valve provided on the outlet pipe from the flow path branching point to the currant side and the bath terminal side flows through the high temperature side water intake path. It is designed to stop at least a load of 10 g against hot water. For example, if only a load that is significantly less than 10 g can be cut off, a high temperature equal to or higher than the set temperature is not supplied even under a specific condition of a small amount of hot water supply request. Further, if the flow rate corresponding to the weight greatly exceeding 10 g can be cut off, high temperature cannot be easily mixed, and high temperature hot water supply cannot be performed. Therefore, if the flow rate corresponding to the weight of about 10 g can be cut off, the convection phenomenon is prevented, and hot water higher than the set temperature is not supplied even under a specific condition where a very small amount of hot water is required.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a configuration diagram of a hot water storage type hot water supply apparatus according to a first embodiment of the present invention.

In the hot water storage type hot water supply apparatus of FIG. 1, the hot water storage tank 101 stores hot hot water, and the boiling pipe 102 connects the upper part and the lower part of the hot water storage tank 101. The hot water in the lower part of the hot water storage tank 101 is flowed to the heat exchanger 104 by the boiling pump 103 provided in the middle of the hot water storage tank 101, and the hot water heated by the heat exchanger 104 is stored from the upper part of the hot water storage tank 101. . The hot water supplied to the upper part of the hot water storage tank 101 is stored in a stacked state in the hot water storage tank 101 in such a form that the hot water is separated into the upper part and the low temperature hot water is separated into the lower part due to the difference in specific gravity. Further, when hot water in the hot water storage tank 101 is used, water is supplied from the water supply pipe 105 to the lower part of the hot water storage tank 101 and stored while maintaining the laminated state.

  In the heat exchanger 104, the hot water from the hot water storage tank 101 and the refrigerant (carbon dioxide) circulating in the refrigerant circuit 106 exchange heat. The refrigerant circuit 106 includes a heat exchanger 104, an evaporator 107, a compressor 108, an expansion valve 109, and a fan 110.

  The boiling operation for heating hot water as described above is usually performed in the late-night time period (for example, from 11:00 pm to 7:00 am) where the electricity rate is low. During the midnight hours, it is checked whether or not low-temperature hot water (or water) is stored in the hot water storage tank 101. If low-temperature hot water is detected, the hot water tank 101 is boiled until the hot water is filled with hot water. Driving continues.

  A hot water discharge pipe 111 for taking out high temperature water is provided at the upper part of the hot water storage tank 101, and an intermediate hot water discharge pipe 112 for taking out the intermediate hot water is provided at a substantially intermediate portion between the hot water supply pipe 111 and the water supply pipe 105. A bath use circuit 116 including a bath heat exchanger 114 and a circulation pump 115 for exchanging heat with hot water in the bathtub 113 and performing a reheating operation is provided from the middle of the hot water discharge pipe 111. It is connected to the lower part of 101. Further, a bath circulation circuit 119 is configured on the secondary side of the bath heat exchanger 114 to connect the bath adapter 117 of the bathtub 113 and circulate the bath water by the bath pump 118.

  With the above-described configuration, the bath chasing operation is performed by exchanging the hot water supplied from the upper part of the hot water storage tank 101 with the bath water flowing in the bath circulation circuit 119 in the bath heat exchanger 114. The hot water whose temperature has decreased due to heat exchange is returned to the hot water storage tank 101 as medium hot water. At this time, the hot water storage tank 101 stores hot water of a high temperature layer, hot water of an intermediate temperature layer, and hot water of a low temperature layer in a laminated state. Further, if this bath chasing operation is continued, the amount of hot water in the upper part of the hot water storage tank 101 decreases, and the amount of intermediate hot water accumulated below it increases.

  This phenomenon of increase in medium-temperature hot water has various adverse effects, and is largely the boiling efficiency of the heat pump during the boiling operation (COP efficiency, a value obtained by dividing the hot water temperature at the heat exchanger 104 outlet by the hot water temperature at the heat exchanger 104 inlet. ). That is, when the hot water increases in the lower part of the hot water storage tank 101, the incoming water temperature of the heat exchanger 104 at the time of boiling rises rapidly, and heat exchange with the refrigerant circulating in the refrigerant circuit 106 in a state where the incoming water temperature is high, The temperature difference with warm water decreases and the boiling efficiency decreases. In particular, in a heat pump cycle using carbon dioxide as a refrigerant, since the high pressure on the high pressure side of the heat pump is high, the degree of decrease in the boiling efficiency (COP efficiency) of the heat pump becomes significant when the incoming water temperature increases. Furthermore, since the hot water in the upper part of the hot water storage tank 101 is reduced as a result of the increase in the hot water temperature, the hot water storage capacity is reduced as a whole, leading to a lack of hot water due to a shortage of hot water.

  Therefore, in the present embodiment, as a measure against the hot water, an intermediate hot water pipe 112 is provided at a substantially intermediate portion of the hot water storage tank 101, and hot water supplied from the intermediate hot water pipe 112 and the upper hot water pipe 111 is mixed to obtain a predetermined mixed water. The first mixing valve 120 is provided to obtain the desired temperature, and the valve opening is adjusted by feeding back the hot water temperature detected by the first temperature detector 121 to ensure a predetermined target temperature. By providing the first mixing valve 120, it is possible to preferentially take out the hot water and supply hot water according to the purpose of use, thereby reducing the hot water in the hot water storage tank 101.

  On the output side of the first mixing valve 120, a load-side circuit corresponding to the application is configured. First, as hot water use, the mixed water from the first mixing valve 120 and the water from the water supply pipe 105 are mixed to set the set temperature. A hot water supply mixing valve 122 which is one of the load side mixing valves for obtaining hot water is provided and supplied to the currant 124. A hot water temperature detector 123 is attached to the output side of the hot water mixing valve 122, and the valve opening is adjusted by feeding back the hot water temperature detected by the hot water temperature detector 123 so as to ensure a set temperature. Yes.

  For bath use, a bath mixing valve 125 is provided as one of the load side mixing valves for mixing the mixed water from the first mixing valve 120 and the water from the water supply pipe 105 to obtain hot water at a set temperature. The bath 113 is connected to the bath circulation circuit 119 via the pouring valve 126 to fill the bathtub 113 with hot water. A bath temperature detector 127 is attached to the output side of the bath mixing valve 125, and the valve opening is adjusted by feeding back the hot water temperature detected by the bath temperature detector 127 so as to ensure the set temperature. ing.

  Note that the high-temperature side water intake passage through which the high-temperature hot water is supplied from the upper hot water discharge pipe 111 of the first mixing valve 120 and the low-temperature side water intake passage through which the intermediate hot water is supplied from the intermediate hot water discharge pipe 112 have a flow resistance of the high-temperature side water intake passage. A check valve 128 is disposed so as to increase.

  As shown in FIG. 2, the check valve 128 has a water stop function up to a predetermined flow rate in the forward direction, is open for a flow rate higher than that, and has a close function in the reverse direction. Is. By utilizing this water stop function in the forward direction, the water stop function is activated when a small amount of hot water is used that is less than the flow rate at which the first mixing valve 120 starts to operate. Therefore, the danger of high temperature hot water can be avoided. In this way, hot water supply with high safety can be performed by disposing the check valve 128 whose flow path resistance increases under a predetermined condition in the high temperature side water intake path.

  A hot water remote controller 132 is provided in the vicinity of the currant 124, and a bath remote controller 133 is provided in the bathroom. The operation instructions from the hot water remote controller 132 or the bath remote controller 133 are sent wirelessly or by wire to a control unit 134 provided on the apparatus body side, and various operations are performed based on the control operations previously defined by the control unit 134 according to the transmitted conditions. I try to do it.

  The operation and action of the hot water storage type hot water supply apparatus configured as described above will be described below. First, when the user opens the currant 124 or the pouring valve 126, the hot hot water stored in the upper part of the hot water storage tank 101 is taken out through the hot water discharge pipe 111, and the first mixing valve is passed through the check valve 128. 120. In the first mixing valve 120, the intermediate temperature hot water (medium temperature hot water) taken out through the intermediate hot water pipe 112 connected to the intermediate temperature position of the hot water storage tank 101 and the high temperature water stored in the upper part of the hot water storage tank 101 are mixed.

  The mixed hot water branches to the hot water supply mixing valve 122 side or the bath mixing valve 125 side. When the mixed hot water flows to the hot water supply mixing valve 122 side, it flows into the hot water supply mixing valve 122 through the check valve 129. Further, tap water supplied from the water supply pipe 105 flows into the hot water supply mixing valve 122. The hot water mixing valve 122 mixes the flowing hot water and water at an arbitrary ratio so as to reach the temperature from the currant 124 through a check valve 131 provided on a pipe between the hot water mixing valve 122 and the hot water temperature detector 123. Hot water is supplied.

  In addition, when the amount of hot water required for the currant 124 is very small, the hot water on the d side of the hot water mixing valve 122 is almost shut off, so hot water over the set temperature by the hot water remote control 132 is not performed from the currant 124. Comfortable hot water is provided.

  On the other hand, when the hot water mixed by the 1st mixing valve 120 flows into the bath mixing valve 125 side, it flows into the bath mixing valve 125 through the check valve 130. Further, tap water supplied from the water supply pipe 105 flows into the bath mixing valve 125. The bath mixing valve 125 mixes the flowing hot water and water at an arbitrary temperature, and supplies hot water to the bath while adjusting the flow rate with the hot water supply valve 126.

  At this time, since the amount of hot water supplied to the bathtub 113 is very large, in the hot water mixing valve 122 on the side of the currant 124, hot water on the d side of the hot water mixing valve 122 tends to flow backward to the bathtub 113 side. Further, in conjunction with this, tap water on the e side of the hot water mixing valve 122 also flows into the d side of the hot water mixing valve 122 so as to flow backward to the bathtub 113 side. However, since the check valve 129 prevents the backflow of tap water, the hot water supply temperature to the bathtub 113 is stabilized.

  In addition, by providing the check valve 129, when the amount of hot water supply to the currant 124 is very small, the hot water flowing to the d side of the hot water mixing valve 122 is cut off to a very small amount (or completely cut off). Therefore, hot water supply higher than the set temperature by the hot water supply remote controller 132 is not performed from the currant 124, and comfortable and safe hot water supply is performed. The check valve 129 cuts off the flow below the predetermined flow rate, but preferably can cut off the weight up to about 10 g. This is because if only a load that is significantly less than 10 g can be cut off, the phenomenon that the hot water flows around the tap water due to the difference in specific gravity due to the temperature difference between the hot water and tap water cannot be prevented. On the other hand, if the flow rate corresponding to the weight greatly exceeding 10 g can be cut off, high temperature cannot be easily mixed, and high temperature hot water supply cannot be performed. The effect of the check valve 129 can be similarly applied to the check valve 130.

  In addition, although the hot water supply to the currant 124 and the hot water supply to the bathtub 113 were explained separately, the hot water mixed by the 1st mixing valve 120 was made to flow to both the hot water supply mixing valve 122 side and the bath mixing valve 125 side. It is also possible to perform simultaneous hot water supply.

  For example, when hot water supply to the currant 124 is requested during hot water supply to the bathtub 113, the d side of the hot water supply mixing valve 122 that has been closed is opened. Then, the hot water flowing out of the first mixing valve 120 flows to both the hot water supply mixing valve 122 side and the bath mixing valve 125 side.

  When hot water supply to the bathtub 113 is requested during hot water supply to the currant 124, the g side of the bath mixing valve 125 that has been closed is opened.

  At this time, since the amount of hot water supplied to the bathtub 113 is very large at the branch point T between the hot water supply mixing valve 122 and the bath mixing valve 125 on the outlet pipe 111, the amount of hot water supplied to the currant 124 tends to decrease. However, the piping diameter to the hot water supply mixing valve 122 side is made longer than the piping diameter to the bath mixing valve 125 side. According to this, even when hot water supply to the bathtub 113 is requested during hot water supply to the currant 124, the flow path resistance to the hot water supply mixing valve 122 side becomes small, and The flow rate is maintained and the hot water supply operation can be stabilized.

  As described above, according to the present embodiment, the hot water supply operation to the currant side is stabilized, and the check water valve is provided on the hot water side (d side) of the hot water mixing valve 122. The hot water exceeding the set temperature is not supplied under a specific condition that a small amount of hot water is required, and a comfortable and safe hot water supply can be realized.

  As described above, the present invention can be applied to a hot water bath heater that can supply hot water accumulated in a hot water storage tank to the bathtub side and the currant side.

The block diagram of the hot water storage type hot water supply apparatus in Embodiment 1 of this invention Check valve characteristics

101 Hot water storage tank 105 Water supply pipe 106 Refrigerant circuit (heat pump circuit)
111 Hot water outlet pipe 112 Intermediate hot water outlet pipe 120 First mixing valve 122 Hot water supply mixing valve 124 Callan 128, 129, 130, 131 Check valve (flow path resistance)

Claims (3)

Hot water that is heated using a heat pump circuit is stored in a stratified state from the upper part of the hot water storage tank, and the hot water is discharged from a hot water pipe provided at the upper part of the hot water storage tank to supply desired hot water to the curran side or the bath terminal side. a formula water heater, mixing with the the medium-temperature hot water pipe to take out hot water from the substantially middle portion of the hot water storage tank, a first mixing valve for mixing hot water from the medium-temperature hot water pipe and the hot water pipe, wherein the first mixing valve A hot water mixing valve for mixing hot and cold water and tap water to supply hot water to Karan, and a bath mixing valve for mixing hot water and tap water mixed by the first mixing valve and supplying hot water to the bath terminal with the door, hot water flowing from the first mixing valve is as a base point the flow path branching point on the hot water pipe that branches to Curran side or bath terminal, to reduce the flow resistance to Curran side than baths terminal Together with the hot water supply When a check valve is provided on the side of the inlet of the joint valve and the bath mixing valve where hot water mixed by the first mixing valve flows, and the hot water flow in the hot water supply direction of the check valve is less than a predetermined amount Hot water mixed with the first mixing valve among the inlets of the hot water mixing valve and the bath mixing valve until the check valve has a water stop function that does not allow hot water to flow and the hot water supply is required. Hot water storage type hot water supply device characterized in that the side into which the water flows is closed . The hot water storage hot water supply apparatus according to claim 1, wherein a pipe diameter of the hot water pipe from the flow path branch point to the currant side is longer than a pipe diameter of the hot water pipe from the flow path branch point to the bath terminal side. The water stop function of the check valve provided on the hot water discharge pipe from the flow path branch point to the currant side and the bath terminal side can stop the load of up to 10 g against hot water flowing through the high temperature side water intake path. The hot water storage type hot water supply apparatus according to claim 1 or 2 .

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