KR100685338B1 - Heat pump type hot water supply device - Google Patents

Abstract

An object of the present invention is to provide an instantaneous heat pump hot water supply device with improved ease of use.

A hot water pump refrigerant circuit, a water supply circuit, and a hot water supply circuit having a cold / hot water mixing valve to eliminate all inflow from the high temperature side inlet when the high temperature side is closed.

Water circuit, water tank, spindle, pressure reducing valve, water supply sensor

Description

 Heat Pump Hot Water Supply Unit {HEAT PUMP TYPE HOT WATER SUPPLY DEVICE}

1 is a system diagram of a heat pump refrigerant cycle, a water supply circuit, and a hot water supply circuit, showing an embodiment of the instantaneous heat pump hot water supply apparatus according to the present invention;

2 is a system diagram of a heat pump refrigerant cycle, a water supply circuit, and a hot water supply circuit, showing another embodiment of the instantaneous heat pump hot water supply apparatus according to the present invention;

Figure 3 is an internal structure showing one embodiment of a hot and cold water mixing valve used in a conventional hot water supply equipment.

<Explanation of symbols for the main parts of the drawings>

1a, 1b: compressor

2: water refrigerant heat exchanger

3a, 3b: decompression device

4a, 4b: evaporator

11: water supply member

12: pressure reducing valve

13: water supply water sensor

14: check valve

16: hot and cold water mixing valve

17: flow control valve

18: hot water member

19: on-off valve

21: water storage tank

26: hot and cold water mixing valve

100: hot and cold water mixing valve

101: hot and cold water mixing valve body

105: first valve seat

106: second valve seat

108: spindle

110: Actuator

112: the guide

116: first valve

118: second valve

[Document 1] Japanese Unexamined Patent Publication No. 2004-69195

[Document 2] Japanese Unexamined Patent Publication No. 2003-279133

The present invention relates to a heat pump hot water supply device capable of directly hot water cooling hot and cold water heated by a water refrigerant heat exchanger.

As a heat pump hot water supply device, a low temperature type heat pump hot water supply device that uses a low-cost nighttime electric power to accumulate hot water in a storage tank at night and supplies water for use during the day is common. In this low-heat type heat pump hot water supply device, sufficient floor surface strength is required to install a large-capacity water storage tank, a large installation area, and a heavy water storage tank. In addition, when the hot water of the boiling water tank was used up, it took time until the next hot water boiled.

On the other hand, in recent years, the heat pump hot water supply apparatus (henceforth an instant type | mold heat pump hot water supply apparatus) which has the heating capability which can make instant hot water supply without boiling as much as possible is developed. Specifically, the instantaneous heat pump hot water supply device is provided with a direct hot water supply circuit for heating the water supplied by a heat exchanger having an instantaneous heating capacity as it is, without passing through a container for temporarily storing cold and hot water, such as a low temperature water tank. This eliminates the need for a large capacity storage tank.

For example, in the instantaneous heat pump hot water supply device introduced in Patent Literature 1, the hot water supply device composed of a heat pump refrigerant circuit, a water supply pipe, a water refrigerant heat exchanger, and a hot water supply circuit, branched from cold / hot water and a water supply pipe heated by a water refrigerant heat exchanger. The mixed water is mixed by a mixing means and hot water is directly heated.

In addition, in the instantaneous heat pump hot water supply apparatus of Patent Document 2, in addition to the configuration of Patent Document 1, a small auxiliary storage tank is provided, and a short time until the heat pump refrigerant circuit is started, and is heated by a water refrigerant heat exchanger. The hot and cold water accumulated in the cold and hot water tanks and the water branched from the water supply pipe are mixed, and the water branched from the water supply pipe is further mixed and tapped as necessary.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2004-69195 (paragraph [0025], FIG. 1)

[Patent Document 2] Japanese Patent Application Laid-Open No. 2003-279133 (paragraph [0038], FIG. 1)

However, in the instantaneous heat pump hot water supply apparatuses of Patent Literatures 1 and 2, it is conceivable in a circuit that hot water hotter than a set temperature suddenly taps when a hot water stopper such as a faucet is opened.

The heat pump hot water supply apparatus disclosed in Patent Document 2 usually controls the circuit in a state described below for safety.

That is, in a hot water supply device having a tapping pipe for directly tapping the cold and hot water heated by the water refrigerant heat exchanger to the outside, and a cold and hot water mixing valve for mixing water from the water supply pipe to cope with a sudden load change during tapping on the tapping pipe. In order to prevent hot water from flowing out suddenly when the state transitions from the closed state of the tapping terminal to the open state, the flow path on the water refrigerant heat exchanger side of the cold / hot water mixing valve is closed when the tapping terminal is closed. The water flow path through the water supply pipe is opened. In this state, even when the tapping terminal is opened with a stopper, hot water at a temperature higher than the set temperature is not suddenly tapped. However, in the conventional mixing valve, hot water at a temperature higher than the set temperature may be released even if the above-described control is performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is that hot water having a temperature higher than a set temperature is tapped out from a heat pump hot water supply device having a direct hot water supply circuit capable of mixing water supplied when tapping. It is to prevent throwing away.

In addition, in the conventional instantaneous heat pump hot water supply apparatus, hot water of a set temperature can be mixed by tapping with water supplied when tapping hot water, but when hot and cold water heated by a water refrigerant heat exchanger is tapped, The temperature may be lower than the set temperature. A second object of the present invention is to bring the temperature of the cold and hot water tapping out from the use terminal close to the set temperature.

In addition, there is a problem that the COP is lowered when the second object is to be achieved. A third object of the present invention is to provide an instantaneous heat pump hot water supply apparatus which suppresses a decrease in COP when the hot water tapping out of the use terminal is brought close to the set temperature.

The heat pump hot water supply device of the present invention for solving the above problems is a compressor, a water refrigerant heat exchanger for performing heat exchange between the refrigerant compressed by the compressor and water, a decompression device in which the heat-exchanged refrigerant is depressurized, A heat pump refrigerant circuit in which evaporators conducting heat exchange are respectively connected to a refrigerant pipe in turn, a water supply port through which water is supplied from the outside, a pressure reducing valve for depressurizing the water supplied, and decompressed water flow in one direction to the water refrigerant heat exchanger. A water supply check valve for supplying water, a water supply circuit in which the water refrigerant heat exchanger is connected to a water pipe in turn, the water refrigerant heat exchanger for heating water supplied from the water supply circuit, heated hot and cold water, and water branched from the water supply circuit. By mixing, closing the valve for the water refrigerant heat exchanger and opening the valve for the water supply circuit. Has a valve structure in which water inflow from the water refrigerant heat exchanger is completely closed, and water inflow from the water supply circuit is not completely closed when the valve for the water refrigerant heat exchanger is opened and the valve for the water supply circuit is closed. A hot / cold water mixing valve, a flow control valve for adjusting the flow rate of hot / cold water to be heated, a hot water supply circuit for hot and cold water to the outside are respectively connected to a water pipeline, and the water refrigerant between the water supply circuit and the hot water circuit. A water storage tank connected in parallel with a water pipe in parallel with the heat exchanger, and a circulation pump for circulating water between the water storage tank and the water refrigerant heat exchanger.

Another heat pump hot water supply device according to the present invention for solving the above problems includes a compressor, a water refrigerant heat exchanger for exchanging water between a refrigerant compressed by the compressor, a decompression device in which the heat exchanged refrigerant is depressurized, and a pressure reduction refrigerant and air. A heat pump refrigerant circuit in which evaporators conducting heat exchange are respectively connected to a refrigerant passage in succession, a water supply port through which water is supplied from the outside, a pressure reducing valve for depressurizing the water supplied, and allowing the reduced water to flow in one direction to the water refrigerant heat exchanger A water supply check valve, a water supply circuit in which the water refrigerant heat exchanger is connected to a water pipe in turn, and the water refrigerant heat exchanger in which water supplied from the water supply circuit is heated, heated hot and cold water, and water branched from the water supply circuit are mixed. When the valve for the water refrigerant heat exchanger is closed and the valve for the water supply circuit is opened. Has a valve structure in which water inflow from the water refrigerant heat exchanger is completely closed, and water inflow from the water supply circuit is not completely closed when the valve for the water refrigerant heat exchanger is opened and the valve for the water supply circuit is closed. The hot / cold water mixing valve, the flow control valve for adjusting the flow rate of the hot / cold water to be heated, the hot water supply circuit for hot / cold water to the outside are connected to the water pipe in turn, and the outlet temperature of the water refrigerant heat exchanger is preset. The temperature is higher than the set hot water supply temperature.

In addition, another heat pump hot water supply apparatus of the present invention for solving the above problems is a compressor, a water refrigerant heat exchanger for performing heat exchange between the refrigerant compressed by the compressor and water, a decompression device for reducing the heat exchanged refrigerant, A heat pump refrigerant circuit in which an evaporator for exchanging air is connected to each refrigerant line in turn, a water supply port through which water is supplied from the outside, a pressure reducing valve for depressurizing the water supplied, and the reduced water in one direction to the water refrigerant heat exchanger A water supply check valve for flowing, a water supply circuit in which the water refrigerant heat exchanger is connected to a water pipe in turn, the water refrigerant heat exchanger for heating the water supplied from the water supply circuit, and heated hot and cold water and water branched from the water supply circuit. By mixing them, the valve for the water refrigerant heat exchanger was closed and the valve for the water supply circuit was opened. A valve structure in which water inflow from the water refrigerant heat exchanger is completely closed, and water inflow from the water supply circuit is not completely closed when the valve for the water refrigerant heat exchanger is opened and the valve for the water supply circuit is closed. The hot / cold water mixing valve which has, the flow control valve which regulates the flow volume of the hot / cold water which taps out, a hot water supply circuit which connects hot / cold water to the outside, respectively, is connected to the water pipeline, and between the said water supply circuit and the said hot / cold water mixing valve On-off valves were installed to shut off all flow.

Another heat pump hot water supply apparatus of the present invention for solving the above problems is a compressor, a water refrigerant heat exchanger for performing heat exchange between the refrigerant compressed by the compressor and water, a decompression device for reducing the heat exchanged refrigerant, A heat pump refrigerant circuit in which an evaporator for exchanging air is connected to each refrigerant line in turn, a water supply port through which water is supplied from the outside, a pressure reducing valve for depressurizing the water supplied, and the reduced water in one direction to the water refrigerant heat exchanger A water supply check valve for flowing, a water supply circuit in which the water refrigerant heat exchanger is connected to the water pipes in turn, the water refrigerant heat exchanger for heating the water supplied from the water supply circuit, and heated hot and cold water and water branched from the water supply circuit. Mix and close the valve for the water refrigerant heat exchanger and open the valve for the water supply circuit. A valve structure for completely eliminating water inflow from the water refrigerant heat exchanger, and completely eliminating water inflow from the water supply circuit when the valve for the water refrigerant heat exchanger is opened and the valve for the water supply circuit is closed. The hot / cold water mixing valve which it has, the flow control valve which adjusts the flow volume of the hot / cold water to tap, and the hot water supply circuit which taps cold / hot water to the outside were provided respectively by the water pipe line.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described based on drawing.

The heat pump refrigerant circuit shown in FIG. 1 is composed of two refrigerant circuits to ensure instant hot water supply capability, and includes a compressor 1a, a water refrigerant heat exchanger 2 (refrigerant side heat transfer tube 2a), and a pressure reducing device 3a. ), The first closed circuit in which the evaporator 4a is sequentially connected to the refrigerant passage, the compressor 1b, the water refrigerant heat exchanger 2 (the refrigerant side heat transfer tube 2b), the pressure reducing device 3b, and the evaporator 4b. It consists of a 2nd closed circuit connected in order to the refrigerant | coolant pipeline, and each circuit is filled with the refrigerant | coolant with high heat pump capability like carbon dioxide.

The compressors 1a and 1b are capable of volume control, and can operate at a large capacity when a large amount of hot water is supplied. Here, the compressors 1a and 1b are subjected to PWM control, voltage control (for example, PAM control), and combination control thereof by a control device (not shown), so that the high speed (for example, 1000 revolutions / minute) is performed. For example, you can change the speed up to 8000 revolutions per minute. In addition, it is preferable to use the compressor suitable for carbon dioxide refrigerant | coolant as the compressors 1a and 1b, for example, a scroll type compressor is used.

The water refrigerant heat exchanger (2) is composed of refrigerant-side heat transfer tubes (2a, 2b) and water supply-side heat transfer tubes (2c, 2d), and the flow of refrigerant in the refrigerant-side heat transfer tubes (2a, 2b) and water supply-side heat transfer tubes (2c, 2d). The water flow in) is the opposite flow, and heat exchange is performed between the high temperature and high pressure refrigerant and the low temperature water. That is, the refrigerant flowing inside the refrigerant side heat transfer tubes 2a and 2b and the water flowing inside the water supply side heat transfer tubes 2c and 2d respectively flow in the reverse directions. At the inlet of the coolant side heat exchanger tubes 2a and 2b, when the coolant, which was high temperature and high pressure, passes through the coolant side heat exchanger tubes 2a and 2b, the water is supplied through the walls of the coolant side heat exchanger tubes 2a and 2b and the water supply side heat transfer tubes 2c and 2d. Heat is applied to the water flowing inside the side heat transfer tubes 2c and 2d to raise the water temperature. The coolant is changed to a state of low temperature and high pressure until the outlet of the coolant side heat transfer tubes 2a and 2b is reached. On the other hand, when the low temperature water passes through the water supply side heat exchanger tubes 2c and 2d at the inlet of the water supply side heat exchanger tubes 2c and 2d, the water is gradually heated, and the water supply side heat exchanger tubes 2c and 2d of the water refrigerant heat exchanger 2 are heated. At the exit, the temperature is raised to a predetermined temperature set by operation control means (not shown).

The temperature of the water whose temperature has risen in this water refrigerant heat exchanger 2 is detected by the water outlet temperature sensor 2e as the water outlet temperature, and is recognized by the operation control means and used for the operation control.

The pressure reduction apparatuses 3a and 3b radiate heat with the water refrigerant heat exchanger 2 to decompress the high-pressure refrigerant at which the temperature is lowered to form a low-temperature low-pressure refrigerant. The air blown in from the outside of the apparatus by the fan is ventilated in the evaporators 4a and 4b through which the refrigerant at low temperature and low pressure flows, so that the heat exchanged between the air and the heat accumulate therein. In other words, the heat of the outside air is absorbed by the refrigerant. The refrigerant having accumulated heat therein is transferred to the water refrigerant heat exchanger 2 by the compressors 1a and 1b and circulates in the refrigerant circuit.

The water supply circuit includes a water supply member 11 for connecting to a water supply source outside the apparatus, a pressure reducing valve 12 for adjusting the pressure of the water supplied to a predetermined water pressure, a check valve 14 for preventing backflow of water in the apparatus, and water The water supply side heat transfer tubes 2c and 2d of the refrigerant heat exchanger 2 are sequentially connected to the water pipeline. The water supply side heat transfer tubes 2c and 2d are divided at the inlet of the water refrigerant heat exchanger 2 in order to reduce the pressure loss in the water supply circuit.

The hot water supply circuit 20 is a cold / hot water mixing valve 20 for mixing the hot and cold water heated by the water refrigerant heat exchanger 2 and the hot / hot water heated by the water refrigerant heat exchanger 2 with the hot water stored in the water storage tank 21. And a hot and cold water mixing valve 16 for mixing hot and cold water heated by the water refrigerant heat exchanger 2 or mixed with hot water of the water storage tank 21 and water supplied through the open opening / closing valve 19. The flow rate adjustment valve 17 which adjusts the flow volume of cold / hot water, and the hot water supply member 18 connected to the exterior of an apparatus are connected in order by the water pipeline. The water refrigerant heat exchanger (2) and the water passing through the water pipe branch branched from the water supply circuit connected to the inlet port to which the cold and hot water mixing valve 16 is connected to the inlet port to which the water pipe line from the water supply side heat transfer pipes 2c and 2d is connected. Adjust the mixing ratio of hot and cold water heated with. The operation control means controls the cold / hot water mixing valve 16 to adjust the temperature of the hot / hot water supplied from the hot water supply circuit to a predetermined temperature (about 35 to 90 ° C.).

The operation control means (not shown) performs operation / stop of the heat pump refrigerant circuit and rotational speed control of the compressors 1a and 1b based on the operation settings of the control circuit, the bathroom remote control, the kitchen remote control, and the like and the detected values of the respective sensors. Moreover, the operation | movement of the cold / hot water mixing valve 16, the flow regulating valve 17, the cold / hot water mixing valve 20, and the opening / closing valve 19 is also controlled. Moreover, each sensor has a temperature sensor which detects the temperature state of each part, the pressure sensor which detects a pressure, the water quantity sensor which detects a quantity, and the like.

When the tap of the hot water supply terminal is opened, the water supply water sensor 13 detects the water introduced from the water supply member 11 by the water pressure, and the operation of the heat pump refrigerant circuit is started by the operation control means.

When the operation of the heat pump refrigerant circuit is started, the water supplied by the water pressure is introduced into the water refrigerant heat exchanger (2) to be heat-exchanged, and the heated hot and cold water is passed through the cold / hot water mixing valve (16). To about 90 ° C.), and hot water can be directly supplied.

In addition, the amount of hot water supply can be adjusted by adjusting the opening degree of the flow rate control valve 17 connected to the front of the hot water supply member 18. For example, the temperature exceeding the heating capability of the water refrigerant heat exchanger 2 may be required depending on the tapping demand. As one control at that time, it is possible to comply with the tapping request by limiting the amount of hot water supply. As hot water supply temperature, it is also possible to adjust to about 60 degreeC at most so that the user of a hot water supply apparatus may not receive unexpected accident.

Here, the hot / cold water mixing valve which can have a big influence on the temperature of the hot / cold water which is directly heated will be described in detail. Conventionally, electric cold and hot water heaters and low temperature type heat pump hot water supply apparatuses sold on the market generally adopt a method of hot water of about 35 to 60 ° C. by mixing low temperature water supply with high temperature hot water of about 60 to 90 ° C. Therefore, water is necessarily mixed with hot water.

Therefore, the hot and cold water mixing valve generally used in an electric hot water heater or a hot water type hot pump hot water supply device has a high temperature inlet side as "closed" and a low temperature inlet side as "open", or a high temperature inlet side as "open". When the low-temperature inlet side is "closed", at least one of the "closed" sides of the low-temperature inlet can not be completely blocked.

In such a hot water type hot water supply device using a conventional cold / hot water mixing valve, hot water having a temperature higher than the set temperature to be hot water and water lower than the set temperature to be hot water are mixed to make hot water at the set temperature to be hot water. It was assumed on the way. As a result, there has been no need for a cold / hot water mixing valve in the prior art that completely blocks water flow in both the hot and cold sides.

An example of the cold / hot water mixing valve generally used in these hot water supply apparatuses is shown in FIG. 3 (a) and FIG. 3 (b). 3 (a) and 3 (b), the mixing valve 100 is constituted by the valve body 101, the guide 112 therein, the spindle 108, the actuator 110, and the like. . The spindle 108 can move in the direction of (a) or (b) by rotating and sliding the inner surface of the guide 112 by the driving force of the actuator 110.

In addition, the mixing valve 100 injects cold and hot water of an arbitrary temperature from the inlet port A, and cold and hot water of another temperature from the inlet port B in the direction of the arrow, respectively, and the valve body 101, the guide 112, and the spindle. The hot and cold water mixed in the space enclosed by 108 and mixed in the direction of the arrow is discharged from the outlet C. As the spindle 108 moves in the direction of (a), it moves from the direction of B to (b). The inflow rate from A increases so that the hot and cold water temperature to mix can be adjusted.

In this structure, in the state of Fig. 3A in which the spindle 108 is most moved in the direction of (a), the second valve 118 attached to the spindle 108 is the valve body 101. The gap between the second valve 118 and the valve body 101 is minimized by being pressed by the second valve seat 106, and most of the hot and cold water flowing out of C is occupied by cold hot water flowing from the inlet of B. .

On the contrary, in the state of FIG. 3 (b) in which the spindle 108 has moved the most in the direction of (b), the first valve 116 attached to the spindle 108 is the first of the valve body 101. The gap between the first valve 116 and the valve body 101 is minimized by being pressed by the valve seat 105, and most of the hot and cold water flowing from C occupies the hot and cold water flowing from the inlet of A.

In either case, the material of the valve and the valve seat is generally composed of a combination of a resin and a resin, a metal and a resin, and a metal and a metal, so that hot and cold water flowing in the gap even when the valve and the valve seat are in contact with each other. It is difficult to shut off the valve completely, and according to the degree of clearance, a small amount of cold and hot water flows into the gap between the valve and the valve seat and flows out to the outlet side.

As described above, in an electric cold or hot water heater or a hot water type heat pump hot water supply apparatus, for example, when using a method in which hot water mixed with hot water at the inlet of A, low temperature water at the inlet of B, and hot and cold water mixed from the outlet of C are discharged. Since hot water is usually mixed with high temperature hot water, hot water flowing from the inlet of A is rarely discharged directly from the outlet of C. For example, the hot water flowing from the inlet of A is completely opened. When the inflow of low temperature water from the inlet of B is interrupted, there is no problem practically even if a small amount of water leaks from the inlet of B in the direction of the arrow by mixing with hot water flowing in the direction of the arrow.

As described above, the cold / hot water mixing valve generally used in an electric hot / cold water heater or a low temperature type heat pump hot water supply device is usually completely closed on the low temperature side and completely closed on the low temperature side without adjusting the high temperature side to fully open. Even when the high temperature side is adjusted to full open, it is not necessary to completely block the low temperature water, and there is no structure to completely block the low temperature water.

In the case of using the hot / cold water mixing valve 16 as described above, which is generally used in an electric hot / cold water heater or a hot water type hot pump hot water supply device for the instantaneous heat pump hot water hot water supply device shown in FIG. 1, the water refrigerant heat exchanger 2 side is used. When it is set to "open" and the water supply circuit 19 side is "closed," the inflow amount from the water supply circuit 19 side cannot be completely eliminated. Therefore, when hot water supply operation is performed, water is supplied by the water pressure and cold / hot water Since the water branched to the mixing valve 16 side enters the hot water side through the cold / hot water mixing valve 16 at a percentage of the total amount of water supplied every minute and mixes with the hot water, the hot water supply temperature decreases.

Similarly to the heat pump hot water supply device shown in FIG. 1, the same state occurs in the instantaneous heat pump hot water supply device of FIG. The configuration of FIG. 2 will be described.

The difference from the apparatus of FIG. 1 is that the water storage tank 21 is provided in parallel with the water refrigerant heat exchanger 2 between the water supply circuit and the hot water supply circuit. In Fig. 2, parts that are not given signs are the same as in Fig. 1.

This heat pump hot water supply device is stored in the hot water heated in the water refrigerant heat exchanger 2 in a short time until the heat pump refrigerant circuit is started, and in the small water storage tank 21 of about 30 to 100 L. Predetermined to be set by the operation control means by mixing hot water having a temperature of about 60 to 90 ° C. with the first cold / hot water mixing valve 26, and mixing low temperature water branched from the water supply pipe with the second cold / hot water mixing valve 16. Hot and cold water of about hot water temperature (about 35-60 degreeC) is heated.

Next, the process at the time of opening the tap of a hot water supply terminal in this hot water supply apparatus of FIG. 2 is demonstrated. First, water introduced from the water supply member 11 by tap water pressure is supplied to the water supply side heat transfer tubes 2c and 2d of the pressure reducing valve 12, the water supply water flow sensor 13, the check valve 14, and the water refrigerant heat exchanger 2. ), When the first cold / hot water mixing valve 26, the second cold / hot water mixing valve 16, the flow regulating valve 17, and the hot water supply member 18 start to flow in the path, the water supply water quantity sensor 13 detects water supply. The operation of the heat pump refrigerant circuit is started by the operation control means.

The second hot and cold water mixing valve 16 uses a cold and hot water mixing valve generally used in an electric hot and cold water heater or a hot water type heat pump hot water supply device. At this time, when the 1st cold / hot water mixing valve 26 side is "closed" and the water supply circuit side is "open", all the inflow from the 1st cold / hot water mixing valve 26 side is removed, or the 1st cold / hot water is When the mixing valve 26 side is "open" and the water supply circuit side is "closed", the inflow from the water supply circuit side cannot be completely eliminated. Therefore, when the hot water supply terminal is opened, the water branched from the water supply circuit due to the water pressure flows into the hot water side at a percentage of the total amount of water supplied every minute through the cold / hot water mixing valve 16 and mixes with the hot water so that the hot water is heated. Will fall.

In addition, in the tank reheating process performed when the hot water stored in the water storage tank 21 decreases, the circulation pump 23 which circulates cold / hot water between the water storage tank 21 and the water refrigerant heat exchanger 2 first starts. At this time, even if the valve opening degree of the 1st cold / hot water mixing valve 26 side is set to "closed", and the water supply circuit side is set to "open", the cold and hot water superheated during reheating from the 1st hot / cold water mixing valve 26 is mixed with hot / cold water Passing through the valve 16, the water in the water supply circuit from the on-off valve 19 may also circulate through the gap between the hot and cold water mixing valve 16.

After such a situation, when hot water supply is started and mixing hot and cold water in the cold / hot water mixing valve 16 is performed, the heated water in the unexpectedly warm water supply circuit is mixed, and the hot water is heated more than necessary. There was a possibility. Therefore, in this embodiment, the opening degree of the valve on the water refrigerant heat exchanger side is "closed," and the valve which has no water flow rate is used as a cold / hot water mixing valve.

That is, in the heat pump hot water supply apparatus according to the present embodiment, when the cold / hot water mixing valve 16 sets the water refrigerant heat exchanger 2 side to "closed" and the water supply circuit 19 side to "open", the water When the inflow amount from the refrigerant heat exchanger 2 side is cut off and the water refrigerant heat exchanger 2 side is "open" and the water supply circuit 19 side is "closed", It is to have a valve function that does not block all the flow rate. By setting it as such a structure, the heat pump hot water supply apparatus in this embodiment improves usability, and prevents hot water of unexpected high temperature from being tapped out, and can perform safe tapping.

Moreover, in the cold / hot water mixing valve 16 of this embodiment, when the water refrigerant heat exchanger 2 side is "open" and the water supply circuit 19 side is "closed," Since the inflow amount cannot be completely eliminated, when the hot water supply operation is performed, the water supplied by the water pressure and branched to the hot / hot water mixing valve 16 side passes through the hot / hot water mixing valve 16 at a rate of a few percent of the total amount of water supplied every minute through the hot / hot water mixing valve 16. It will flow into the hot water, so the hot water temperature will drop. Therefore, what is necessary is just to heat the temperature of the cold / hot water heated by the water refrigerant | coolant heat exchanger 2 to temperature higher than predetermined | prescribed hot water supply temperature set by an operation control means, for example, about 0 to 5 degreeC.

Thereby, even if the water branched from the water supply circuit leaks and is mixed with the cold and hot water from the water refrigerant heat exchanger 2 in the hot and cold water mixing valve 16, according to the present embodiment, even if the temperature is lowered, it is about 0 to 5 ° C. Since it is stabilized by temperature fall, the temperature of the cold / hot water heated from the hot water supply port of a hot water supply apparatus can be made into the predetermined temperature set by the operation control means substantially.

In addition, when the temperature of the hot and cold water is heated to a temperature higher than the tapping temperature in the water refrigerant heat exchanger 2 with respect to the predetermined hot water temperature set by the operation control means, when the heating is performed in the heat pump refrigerant circuit by a high temperature. The grade factor of is lowered. Thus, an on-off valve 19 that is completely closed between the branch of the water supply circuit and the cold / hot water mixing valve 16 may be provided. When the hot water supply terminal is opened, the on / off valve 19 prevents leakage of low temperature water from the water supply circuit to the hot water supply circuit side via the hot / cold water mixing valve 16, and thus does not cause a temperature drop. The temperature of the cold / hot water heated by the apparatus 2 can be made into the predetermined hot water supply temperature set by the operation control means, and a high grade coefficient can be obtained.

The cold / hot water mixing valve 16 closes all the inflows from the water refrigerant heat exchanger 2 side when the water refrigerant heat exchanger 2 side is “closed” and the water supply circuit side is “open”. When the water refrigerant heat exchanger 2 side is "open" and the water supply circuit side is "closed," the function of closing all the inflows from the water supply circuit side, that is, closing the valve to the water refrigerant heat exchanger 2, When the valve for the water supply circuit is opened, all water inflow from the water refrigerant heat exchanger 2 is removed, and when the valve for the water refrigerant heat exchanger 2 is opened and the valve for the water supply circuit is closed, A valve having a valve function for removing all water inflow may be applied.

When the cold / hot water mixing valve having such a function is applied to the heat pump hot water supply device according to the present embodiment, for example, in FIG. 1, when the hot water supply terminal is opened, the low temperature from the water supply circuit to the hot water supply circuit side is passed through the cold / hot water mixing valve 16. Since the water does not leak and temperature decrease does not occur, the temperature of the cold and hot water heated by the water refrigerant heat exchanger 2 can be set to a predetermined hot water temperature set by the operation control means, and the usability of the device is improved. At the same time, a high grade factor can be obtained.

Naturally, these configurations are also applicable to FIG. For example, the temperature of the cold / hot water heated by the water refrigerant heat exchanger 2 is heated to a temperature higher than a predetermined hot water temperature set by the operation control means, for example, a temperature higher than 0 to 5 ° C. Thereby, even if the hot and cold water flowing out from the 1st cold / hot water mixing valve 26 and the water branched from the water supply circuit are mixed in the 2nd cold / hot water mixing valve 16, it is stable by the temperature fall of about 0-5 degreeC depending on conditions. Therefore, the temperature of the cold / hot water heated from the hot water supply port of the hot water supply device can be set to the predetermined hot water temperature set by the operation control means.

In addition, instead of heating the temperature of the cold / hot water to the temperature higher than the temperature of the hot water for tapping the temperature of the cold / hot water with respect to the predetermined hot water temperature set by the operation control means, the branch of the water supply circuit is mixed with the hot / hot water. You may provide the on-off valve 19 which closes all the valves 16 between them. When the hot water supply terminal is opened, it is possible to prevent the low temperature water from leaking from the water supply circuit to the hot water supply circuit via the hot / cold water mixing valve 16, and thus the temperature decrease does not occur. Thus, the cold / hot water heated by the water refrigerant heat exchanger 2 The temperature can be set to the predetermined hot water temperature set by the operation control means, so that the ease of use of the device can be improved and a high coefficient of performance can be obtained.

In addition, when the 2nd hot / cold water mixing valve 16 made the 1st cold / hot water mixing valve 26 side "open" and the water supply circuit side "closed" instead of adding the closing valve 19 which is all closed, The function of eliminating all the inflow from the water supply circuit side, that is, when the valve for the water refrigerant heat exchanger 2 is closed and the valve for the water supply circuit is opened, all the water inflow from the water refrigerant heat exchanger 2 is removed, and water When the valve for the refrigerant heat exchanger (2) is opened and the valve for the water supply circuit is closed, it is a cold / hot water mixing valve having a valve function to eliminate all the water inflow from the water supply circuit, so that it is heated by the water refrigerant heat exchanger (2). The temperature of the hot and cold water can be set to a predetermined hot water temperature set by the operation control means, so that the ease of use of the device can be improved and a high performance coefficient can be obtained. There.

In addition, in the instantaneous heat pump hot water supply apparatus according to the present embodiment, by using carbon dioxide as the refrigerant used in the heat pump refrigerant circuit, it is possible to supply hot water with a higher temperature than the conventional refrigerant due to its refrigerant characteristics. can do. In addition, in the instantaneous heat pump hot water supply apparatus having a small capacity storage tank, by heating the temperature of the hot water accumulated in the storage tank to a high temperature, the amount of heat accumulated in the storage tank can be increased, and the temperature of the cold and hot water heated by the water refrigerant heat exchanger. Can be set to a predetermined hot water temperature set by the operation control means, thereby improving the ease of use and obtaining a high performance coefficient.

According to the above description, the heat pump hot water supply device according to the embodiment of the present invention has improved usability in the heat pump hot water supply device for directly hot water supplying cold / hot water heated to a predetermined temperature by a water refrigerant heat exchanger.

According to the present invention, it is possible to prevent hot water having a temperature higher than the set temperature from being heated from the heat pump hot water supply apparatus capable of mixing the water supplied at the time of hot water tapping.

Further, according to the present invention, when tapping the hot and cold water heated by the water refrigerant heat exchanger, the temperature of the hot and cold water tapping from the using terminal can be made close to the set temperature so that the temperature of the hot water tapping from the using terminal is not lower than the set temperature. have.

Moreover, the instantaneous heat pump hot water supply apparatus which suppressed the fall of the coefficient of performance (COP) can be provided when the temperature of the hot water heated by the use terminal is close to a preset temperature.

Claims (5)

A heat pump, in which a compressor, a water refrigerant heat exchanger for exchanging water and a refrigerant compressed by the compressor, a decompression device for depressurizing the heat exchanged refrigerant, and an evaporator for exchanging the decompressed refrigerant and air, are respectively connected to the refrigerant conduit. With a refrigerant circuit, A water supply port through which water is supplied from the outside, a pressure reducing valve for depressurizing the water supplied, a water supply check valve for flowing the reduced water in one direction to the water refrigerant heat exchanger, and a water supply in which the water refrigerant heat exchanger is connected to the water pipe in turn. Circuits, The water refrigerant heat exchanger for heating the water supplied from the water supply circuit and the heated cold / hot water and the water branched from the water supply circuit were mixed to close the valve for the water refrigerant heat exchanger and open the valve for the water supply circuit. Has a valve function to eliminate all the water inflow from the water refrigerant heat exchanger at the time, and to eliminate all the water inflow from the water supply circuit when the valve for the water refrigerant heat exchanger is opened and the valve for the water supply circuit is closed. Hot and cold water mixing valve, a flow rate control valve for adjusting the flow rate of hot and cold water to tap the hot water supply circuit, the hot water supply circuit for tapping the hot and cold water to the outside, respectively, the hot water supply circuit, A water storage tank connected between the water supply circuit and the hot water supply circuit by a water pipe in parallel with the water refrigerant heat exchanger; A heat pump hot water supply device having a circulation pump for circulating water between the water storage tank and the water refrigerant heat exchanger. A heat pump, in which a compressor, a water refrigerant heat exchanger for exchanging water and a refrigerant compressed by the compressor, a decompression device for depressurizing the heat exchanged refrigerant, and an evaporator for exchanging the decompressed refrigerant and air, are respectively connected to the refrigerant conduit. With a refrigerant circuit, A water supply port through which water is supplied from the outside, a pressure reducing valve for depressurizing the water supplied, a water supply check valve for flowing the reduced water in one direction to the water refrigerant heat exchanger, and a water supply in which the water refrigerant heat exchanger is connected to the water pipe in turn. Circuits, The water refrigerant heat exchanger for heating the water supplied from the water supply circuit and the heated cold / hot water and the water branched from the water supply circuit were mixed to close the valve for the water refrigerant heat exchanger and open the valve for the water supply circuit. Has a valve function to eliminate all the water inflow from the water refrigerant heat exchanger at the time, and to eliminate all the water inflow from the water supply circuit when the valve for the water refrigerant heat exchanger is opened and the valve for the water supply circuit is closed. Hot and cold water mixing valve, a flow rate control valve for adjusting the flow rate of hot and cold water to tap the hot water supply circuit, the hot water supply circuit for tapping the hot and cold water to the outside, respectively, the hot water supply circuit, And a heat pump hot water supply device including control means for setting a water outlet temperature of the water refrigerant heat exchanger to a temperature higher than a preset hot water supply temperature. A heat pump, in which a compressor, a water refrigerant heat exchanger for exchanging water and a refrigerant compressed by the compressor, a decompression device for depressurizing the heat exchanged refrigerant, and an evaporator for exchanging the decompressed refrigerant and air, are respectively connected to the refrigerant conduit. With a refrigerant circuit, A water supply port through which water is supplied from the outside, a pressure reducing valve for depressurizing the water supplied, a water supply check valve for flowing the reduced water in one direction to the water refrigerant heat exchanger, and a water supply in which the water refrigerant heat exchanger is connected to the water pipe in turn. Circuits, The water refrigerant heat exchanger for heating the water supplied from the water supply circuit and the heated cold / hot water and the water branched from the water supply circuit were mixed to close the valve for the water refrigerant heat exchanger and open the valve for the water supply circuit. Has a valve function to eliminate all the water inflow from the water refrigerant heat exchanger at the time, and to eliminate all the water inflow from the water supply circuit when the valve for the water refrigerant heat exchanger is opened and the valve for the water supply circuit is closed. Hot and cold water mixing valve, a flow rate control valve for adjusting the flow rate of hot and cold water to tap the hot water supply circuit, the hot water supply circuit for tapping the hot and cold water to the outside, respectively, the hot water supply circuit, A heat pump hot water supply device having an on-off valve for blocking all the flow of water between the water supply circuit and the cold and hot water mixing valve. A heat pump, in which a compressor, a water refrigerant heat exchanger for exchanging water and a refrigerant compressed by the compressor, a decompression device for depressurizing the heat exchanged refrigerant, and an evaporator for exchanging the decompressed refrigerant and air, are respectively connected to the refrigerant conduit. With a refrigerant circuit, A water supply port through which water is supplied from the outside, a pressure reducing valve for depressurizing the water supplied, a water supply check valve for flowing the reduced water in one direction to the water refrigerant heat exchanger, and the water refrigerant heat exchanger are connected to the water pipe in turn. With a water circuit, The water refrigerant heat exchanger for heating the water supplied from the water supply circuit and the heated cold / hot water and the water branched from the water supply circuit were mixed to close the valve for the water refrigerant heat exchanger and open the valve for the water supply circuit. Hot and cold water mixing having a valve function to eliminate all the water inflow from the water refrigerant heat exchanger at the time, and to remove all the water inflow from the water supply circuit when the valve for the water refrigerant heat exchanger is opened and the valve for the water supply circuit is closed. A heat pump hot water supply device having a hot water supply circuit in which a valve, a flow rate adjustment valve for adjusting a flow rate of hot and cold water to be hot-pressed, and a hot water supply port for hot and cold water to the outside are sequentially connected to a water pipe. The heat pump hot water supply apparatus according to any one of claims 1 to 4, wherein the refrigerant used in the heat pump refrigerant circuit is carbon dioxide.

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