JPH01300169A - Refrigeration cycle device - Google Patents

Abstract

PURPOSE:To make it possible to defrost during the heating operation, stabilize the operation, and simplify the refrigeration cycle by arranging the outdoor heat exchanger and a heat-absorptive section in a heat storage device in parallel during the heating operation. CONSTITUTION:A main circuit 27 is formed by connecting a capacity-variable compressor 21, a heat exchanger 22a for heating in a heat storage device 22, a four-way valve 23, an indoor heat exchanger 24, a pressure reducer 25, an outdoor heat exchanger 26, and the four-way valve 23 in sequence. A defroster circuit 30 connects the intervening part between the compressor 21 and the heat exchanger 22a for heating to the inlet of the outdoor heat exchanger 26 with a two-way valve 28, a pressure-reducer 29, and a heat-absorptive heat exchanger 22b in the heat storage device 22 intervening therebetween. Thus the indoor heat exchanger 24 and the heat-absorptive heat exchanger 23b are arranged in parallel. The amount of the heat released to the indoor heat exchanger 24 and that of the heat released to the outdoor heat exchanger 26 for defrosting are decided by the ratio of the quantity of the refrigerant flowing to the indoor heat exchanger 24 to that of the refrigerant to the heat-absorptive heat exchanger 22b. Therefore, by adjusting the throttle resistance of the pressure reducer 29, it is made easy to adequately control the heating capacity and the defrosting capacity.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a refrigeration cycle device with an improved defrosting circuit.

(Prior Art) Some air conditioners are equipped with a heat pump type refrigeration cycle shown in FIG. 2 and are capable of cooling, heating, and defrosting operations.

In Fig. 2, 1 is a variable capacity compressor;
4-way valve 2. Indoor heat exchanger 3. A pressure reducing device such as a capillary tube4. The outdoor heat exchanger 5 and the like are successively connected to form a main circuit 6. In addition, compressor 1 and four-way valve 2
The communication section is connected to the communication section between the capillary tube 4 and the outdoor heat exchanger 5 via the two-way valve 7, thereby forming a hot gas bypass type defrosting circuit 8.

During cooling operation, the four-way valve 2 is deactivated to allow the discharged refrigerant to flow in the direction of the dashed-dotted arrow, causing the outdoor heat exchanger 5 to act as a condenser and the indoor heat exchanger 3 to act as an evaporator, forming a cooling cycle. .

During heating operation, the four-way valve 2 is switched (as shown!) to flow the refrigerant in the direction of the solid arrow, and the indoor heat exchanger 3 is turned into a condenser,
The outdoor heat exchanger 5 acts as an evaporator to form a heating cycle.

During defrosting operation, the two-way valve 7 is opened to flow the refrigerant in the direction of the dashed arrow, forming a defrosting cycle.

Furthermore, a refrigeration cycle using heat storage as shown in FIG. 3 is known.

In FIG. 3, the compressor 11 includes a heat exchanger 12a for heating the heat storage device 12, a four-way valve 13. Indoor heat exchanger14. two-way valve 1
5. A main circuit 18 is constructed by sequentially communicating a pressure reducer such as an expansion valve 16° and an outdoor heat exchanger 17. Also,
The communication part between the indoor heat exchanger 14 and the two-way valve 15 is connected to the two-way valve 19.
．． Expansion valve 1 via heat exchanger 12b for heat absorption of heat storage device 12
6 and the communication part of the outdoor heat exchanger 17, and the defrosting circuit 20
It consists of

During heating operation, the four-way valve 13 is switched (in the illustrated state), and the two-way valve 15 is opened to allow the refrigerant to flow in the direction of the solid arrow, forming a heating cycle.

During defrosting operation, the two-way valve 15 is closed and the two-way valve 1 is closed.
9 is opened and the refrigerant flows in the direction of the dashed arrow to form a defrosting cycle. That is, the outdoor heat exchanger 14 is heated by the heat stored in the heat storage device 9.

Defrosting is performed.

(Problem 8 to be Solved by the Invention) However, in the former refrigeration cycle, most of the refrigerant discharged from the defrost circuit 8 during defrosting due to the throttle resistance between the main circuit 6 and the defrost circuit 8. During the defrosting operation, the heating capacity was practically zero, causing a drop in the room temperature during the defrosting operation.

In the latter case, the indoor heat exchanger 14.
Heat exchanger 1.2 b for heat absorption of the heat storage device 12 .

Since the outdoor heat exchanger 17 is connected in series, the amount of heat released to the indoor heat exchanger 14 and the outdoor heat exchanger 17 for defrosting are
The distribution ratio is determined by the resistance from the indoor heat exchanger 14 to the outdoor heat exchanger 17. Therefore, it is easily affected by extension pipes, etc., and it is extremely difficult to properly control the heating capacity and defrosting capacity. Moreover, the indoor heat exchanger 14. Because the endothermic heat exchanger 12b and the outdoor heat exchanger 17 are connected in series, the refrigeration cycle is complicated, such as requiring a two-way valve 15 to close the main circuit 18 during defrosting operation. This caused an increase in costs.

This invention was made with attention to the above-mentioned circumstances, and its purpose is to provide a refrigeration cycle that can perform defrosting operation while performing heating operation, stable operation, and further simplification. The goal is to provide equipment.

[Structure of the invention] (Means and operation for solving communication) In order to achieve the above object, the present invention provides a compressor, a heating section of a heat storage device,
In a refrigeration cycle device in which a four-way valve, an outdoor heat exchanger, and an indoor heat exchanger are connected in sequence, the communication section that communicates the compressor and the heating section of the heat storage device is connected to the on-off valve, the pressure reducing device, and the heat absorption section of the heat storage device. By connecting to the inlet of the outdoor heat exchanger during heating operation through the section to form a defrosting circuit, the outdoor heat exchanger and the heat absorption section of the heat storage device are configured in parallel during heating operation, and a stable Operation is possible, and the refrigeration cycle can be simplified.

(Example) An example of the present invention will be described below with reference to FIG.

As shown in FIG.
A heating heat exchanger 22a is a heating section.

Four-way valve 23. Indoor heat exchanger 24. A pressure reducing device such as a capillary tube 25. Outdoor heat exchanger 26° Four-way valve 2
3 are successively connected to form a main circuit 27. The communication portion between the compressor 21 and the heating heat exchanger 22a of the heat storage device 22 is connected via a two-way valve 28° pressure reducing device, such as a capillary tube 29, and the heat absorption heat exchanger 22b, which is the heat absorption portion of the heat storage device 22. It is connected to the inlet portion of the outdoor heat exchanger 26, that is, the communication portion between the capillary tube 25 and the outdoor heat exchanger 26, and constitutes a defrosting circuit 30.

Next, the operation in the above configuration will be explained.

First, an operating section (not shown) is operated to start the compressor 21 and to switch the four-way valve 23 (the state shown in the drawing).

Then, the refrigerant discharged from the compressor 21 is transferred to the heating heat exchanger 22a of the heat storage device 22, the four-way valve 23.
Indoor heat exchanger 24. Capillary tube25. It flows through the outdoor heat exchanger 26 and the four-way valve 23 to the suction side of the compressor 21.

At this time, the refrigerant flowing through the indoor heat exchanger 24 emits heat indoors and liquefies. The refrigerant flowing through the outdoor heat exchanger 26 absorbs heat from the outdoor air and vaporizes.

In other words, the indoor heat exchanger 24 is a condenser, and the outdoor heat exchanger 26 is a condenser.
acts as an evaporator, and heating operation using outdoor air as a heat source is started.

By the way, during the heating operation in winter, as the heating operation progresses, frost gradually begins to adhere to the surface of the outdoor heat exchanger 26.

In such a case, a heat exchanger temperature sensor (not shown) detects the temperature of the outdoor heat exchanger 26, and when the detected temperature falls below a predetermined value, the two-way valve 28 is opened.

Then, a portion of the refrigerant from the compressor 21 flows through the two-way valve 28. as shown by the dashed arrow. Capillary tube29. After flowing into the endothermic heat exchanger 22b and removing the heat stored in the heat storage device 22, it flows into the outdoor heat exchanger 26. That is, the outdoor heat exchanger 26 is defrosted by the heat of the heat storage device 22.

In such a refrigeration cycle, the indoor heat exchanger 24
Since the heat exchanger 22b for heat absorption of the heat storage device 22 is configured in parallel, the amount of heat radiated to the indoor heat exchanger 24 and the amount of heat radiated to the outdoor heat exchanger 26 for defrosting are the same as that of the indoor heat exchanger 22. 24 or the flow rate ratio of the refrigerant to the endothermic heat exchanger 22b. Therefore, by adjusting the throttling resistance using the capillary tube 29, it is easy to appropriately control the heating capacity and the defrosting capacity, so that the defrosting operation can be performed while performing the heating operation, and moreover, stable operation can be achieved. is possible. Furthermore, it is possible to eliminate the need for a two-way valve for closing the main circuit 27 during defrosting operation, thereby simplifying the refrigeration cycle and contributing to cost reduction.

In the above embodiments, the application to an air conditioner has been described, but the invention can be similarly applied to a water heater or the like. Also,
Although the heating heat exchanger 22a is provided midway between the compressor 21 and the four-way valve 23, it may be provided midway between the four-way valve 23 and the indoor heat exchanger 24.

In addition, the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.

[Effects of the Invention] As described above, according to the present invention, one end of the defrosting circuit is connected to the communication section that communicates the compressor and the heating section of the heat storage device, and the other end of the defrosting circuit is opened and closed. valve.

By connecting the decompression device and the heat absorption part of the heat storage device to the outdoor heat exchanger during heating operation, the outdoor heat exchanger and the heat absorption part of the heat storage device are configured in parallel during heating operation. It is possible to perform defrosting operation while operating, stable operation is possible, and the refrigeration cycle can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a refrigeration cycle showing an embodiment of the present invention, FIG. 2 is a block diagram of a conventional refrigeration cycle, and FIG. 3 is a block diagram of another conventional refrigeration cycle. 21... variable capacity compressor, 22... heat storage device, 22b
... Endothermic heat exchanger, 24 ... Indoor heat exchanger, 26
...Outdoor heat exchanger, 27...Two-way valve, 28...Capillary tube, 29...Defrosting circuit. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] In a refrigeration cycle device in which a compressor, a heating section of a heat storage device, a four-way valve, an outdoor heat exchanger, and an indoor heat exchanger are connected in sequence, defrosting is applied to the communication section that communicates the compressor and the heating section of the heat storage device. A refrigeration cycle characterized in that one end of the circuit is connected, and the other end of the defrosting circuit is connected to the inlet of an outdoor heat exchanger during heating operation via an on-off valve, a pressure reducing device, and a heat absorption part of a heat storage device. Device.