JPS61184366A - Heat pump type hot-water supply device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an air source heat pump type water heater equipped with a hot water storage tank, and in particular, the present invention relates to an air source heat pump type water heater equipped with a hot water storage tank, and in particular, the high temperature part and the low temperature part of the hot water supply in the hot water storage tank during unboxing operation. The present invention relates to a heat pump water heater suitable for completely preventing mixing.

[Background of the invention]

In the conventional apparatus, as described in Japanese Patent Application Laid-Open No. 58-124132, hot water can be circulated only in one direction between a hot water heat exchanger and a hot water storage tank.

In an air source heat pump water heater, during hot water supply operation, unboxing operation (reverse cycle operation) is performed to remove the heat exchanger for the YC heat source from the box h', but in this case, the hot water heat exchanger is connected to the evaporator. The hot water is cooled.

For this reason, the temperature of the hot water supply at the top of the hot water storage area is
The temperature decreases because the cooled hot water flows into the high temperature area. There were problems such as.

[Purpose of the invention]

An object of the present invention is to provide a heat pump water supply system that can efficiently raise the temperature of stored hot water.

[Key points of invention]

For air source heat pump water heaters, when the air temperature is low, such as during winter, the hot water supply capacity may decrease if frost builds up on the heat source heat exchanger or if more frost builds up on the heat source heat exchanger. becomes significant. For this reason, it is necessary to defrost at certain intervals, but since defrosting is performed by continuous reverse cycles,
In this case, the hot water supply heat exchanger, which was used as a heater during the supply Ii# operation, becomes a cooler. The device of the present invention is capable of preventing a drop in Iai of the high temperature hot water supply water in the upper part of the solar storage facility by reversing the flow direction of the hot water supply water during defrosting operation from that during 1M hot water operation. Features. That is, during defrosting operation, the high-temperature water f at the top of the hot water storage tank flows into the hot water heat exchanger, and the water cooled here is returned to the low-temperature water section at the bottom of the hot water storage tank. The water and the lower temperature water are separated and do not mix. Therefore, it is possible to increase the temperature of hot water efficiently.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The air heat source heat pump type water heater of the present invention shown in FIG.
, a refrigeration cycle consisting of an expansion device 1lt4, a four-way valve 5, a blower device 16, etc., a hot water storage tank 7, a pump 8, a water valve 9
．． It is composed of water systems such as 10, 11, 12 and 13.

In the hot water supply operation mode, the water valves 9 and 10 are open, and the water valves 11, 12, and 13 are closed.

In this operation mode, the refrigerant vapor made high temperature and high pressure by the compressor 1 passes through the four-way valve 5 and enters the hot water heat exchanger 2, where the water valve is opened by the pump 8 from the lower part of the hot water storage tank 7. It is cooled by the low-temperature hot water that is sent through all 9 parts and condenses into liquid. The hot water is heated, passes through the open water valve 10, and flows into the upper part of the hot water storage tank 7. The liquid refrigerant condensed and liquefied in the hot water supply heat exchanger 2 is depressurized in the expansion device 4 and enters the heat source heat exchanger 3 p1 where it absorbs heat from the air sent by the blower [6] and evaporates. After the evaporated refrigerant passes through the four-way valve 5, it is sucked into the pressure # machine IK. The hot water in the hot water storage tank 7 has a high temperature at the top and a low temperature at the bottom. Eventually, the hot water in the storage tank is heated to a predetermined target temperature. Next, the defrosting operation mode will be explained.

During hot water supply operation, when the outside air temperature becomes low in winter, 10 heat exchangers for the heat source may be installed. As time passes, the amount of frost t gradually increases and the performance decreases. Therefore, it is necessary to defrost the water during hot water supply operation. In the defrosting operation mode, the four-way valve 5 is connected to the discharge side of the pressure machine 1 and the heat source heat 5! The exchanger 3 is switched so that the suction side of the compressor 1 and the hot water supply heat exchanger 2 communicate with each other. In addition, the water valves 11 and 12 are in the open state,
Water valve 9.10.13 is closed. The refrigerant vapor made high temperature and high pressure by the pressure 6 machine 1 passes through the four-way valve 5 and then enters the heat source heat exchanger 3, where it melts the frost attached to the heat source heat exchanger 3. Condensate and liquefy. The liquefied refrigerant is depressurized by the expansion device fIL4 and enters the hot water heat exchanger 2. Here, hot water storage 4! The refrigerant evaporates by absorbing heat from the hot water which is passed from the upper part of the I7 by the pump 8 through the water valve 11 which is open. Hot water is cooled.

As mentioned above, hot water flows out from the lower part of the hot water storage tank 7 during hot water failure, passes through the hot water heat exchange can 2, and returns to the upper part of the hot water storage 1117, and flows out from the upper part of the hot water storage tank 7 during defrosting operation. After passing through two hot water heat exchangers, the water returns to the lower sVc of the hot water storage tank 7. Therefore, according to the present embodiment, the high temperature water in the upper part of the hot water storage tank 7 obtained in the II & hot water operation is VC
Since the hot water to be cooled is not mixed with the hot water at the top of the hot water storage tank 7, the high temperature water is always at the top, and hot water at a comfortable temperature can be stably obtained.

Next, the embodiment shown in FIG. 2 will be explained.

Since the configuration of this device is almost the same as that shown in FIG. 1, a description of its configuration and operation will be omitted. The difference from the one shown in Fig. 1 is that the pump 8, water valve 9, pump 14, and This is because the valves 15 are connected in parallel. That is, during hot water supply operation, the pump 8
is in the ON state, the water valves 9 and 10 are in the open state, the pump 14 is in the OFF state, and the water valve 15 is in the closed state. is in the OF'F' state, and the water valve 9 is in the closed state. Therefore, the hot water supply operation mode is turned off, and the hot water flows out from the lower part of the hot water storage tank 7 and returns to the upper part of the hot water storage 7 after passing through the hot water heat exchanger 2 . In the operation mode, the water flows out from the upper part of the hot water storage tank 7, passes through the hot water heat exchanger 21r, and then flows into the hot water storage tank 7.
Return to the bottom of the page. In this case, as well as the case shown in Fig. 1, the hot water obtained during hot water supply operation is mixed at the top of the hot water storage tank 7 with hot water that is cooled during continuous defrosting. never be done.

In addition, in the hot water supply apparatus of the present invention, different methods may be used to change the outlet and inlet of hot water from the hot water storage tank 7 during hot water supply operation and defrosting operation.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to prevent the temperature of the still hot water in the upper part of the hot water storage tank from decreasing due to the mixing of low temperature water during the filtration operation, so that the hot water supply operation can be carried out efficiently. In addition, the upper part of the hot water storage monastery is maintained at a high temperature, so hot water at a comfortable temperature is always available.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of another embodiment. 1... Compressor 2... Hot water heat exchanger 3...
Heat exchanger for heat source 4... Expansion device 5... Four-way valve 6... Air blower 7... Hot water storage tank 8... Pump 19... Water valve l 10... Water valve 2
11...Water valve 3 12...Water valve 4
13...Water valve 5 14...Pump 2 15.
...Water valve 616...Faucet.

Claims (1)

[Scope of Claims] 1. In a hot water supply system consisting of a compressor, a hot water supply heat exchanger, a heat source heat exchanger, an expansion device, a four-way valve, a hot water storage tank, a pump, a water valve, etc., the lower part of the hot water storage tank and the hot water supply heat One end of the exchanger is connected through a water valve and a pump in series, the upper part of the hot water storage tank and the other end of the hot water heat exchanger are connected through a water valve, and the piping between the lower part of the hot water storage tank and the water valve is connected. as well as,
Branch pipes are installed between the water valve and between the water valve and the pump, and these branch pipes are connected to the upper part of the hot water storage tank and the hot water heat exchanger through the water valves. A water heater characterized in that one end is connected to both ends of a water valve of piping connected via a water valve. 2. In the water heater according to claim 1, the lower part of the hot water storage tank and one end of the hot water heat exchanger are connected with a water valve and a pump interposed in series, and a pump and a pump are connected in parallel to the water valve and pump. A pipe line with water valves in series is installed,
A hot water supply device characterized in that the upper part of a hot water storage tank and a hot water heat exchanger are connected through a water valve.