WO2019091240A1

WO2019091240A1 - Heating circulation system for air conditioning, and air conditioner

Info

Publication number: WO2019091240A1
Application number: PCT/CN2018/107875
Authority: WO
Inventors: 王飞; 吴洪金; 付裕; 许文明
Original assignee: 青岛海尔空调器有限总公司
Priority date: 2017-11-09
Filing date: 2018-09-27
Publication date: 2019-05-16
Also published as: CN107677008A

Abstract

A heating circulation system for air conditioning, and an air conditioner. The heating circulation system for air conditioning comprises a compressor (1), an indoor heat exchanger (2), a first throttling device (3), and an outdoor heat exchanger (4) which are connected in series in a main loop. A bypass loop (N) is arranged between the main loop and the compressor (1). A portion of a refrigerant flowing out from the indoor heat exchanger (2) flows into the bypass loop (N). Another portion of the refrigerant flows along the main loop. The invention can effectively increase a subcooling section of a system, that is, a medium-temperature high-pressure liquid refrigerant flowing out from an indoor heat exchanger (2) continues to release heat to lower a temperature before flowing through a first throttling device (3). The invention also enables the medium-temperature high-pressure liquid refrigerant flowing out from the indoor heat exchanger (2) to evaporate and absorb heat in two streams, that is, an evaporation area of the refrigerant increases, thereby effectively enhancing heat exchange capability of the system.

Description

Air conditioning heating cycle system and air conditioner

Technical field

The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning heating cycle system and an air conditioner.

Background technique

The existing air conditioning heating and heating system usually forms a heating cycle by a condenser, a throttling device, an evaporator, a compressor, and a four-way valve, and the high-temperature and high-pressure gaseous refrigerant discharged from the compressor is condensed into a room condenser through a four-way valve. The low temperature and high pressure liquid is throttled into a low temperature and low pressure liquid through a throttling device, and then enters the outdoor evaporator to evaporate and absorb heat to form a gaseous refrigerant, which is then sucked by the compressor through the four-way valve to complete the heating cycle.

During the heating cycle operation, the high-temperature and high-pressure gaseous refrigerant forms a low-temperature and high-pressure liquid refrigerant after heat exchange through the condenser, and then throttling and depressurization through a throttling device to form a low-temperature low-pressure gas-liquid two-phase zone refrigerant and enter the evaporator. Heat exchange. The larger the evaporation area, the higher the relative evaporation capacity. Among them, the low temperature and high pressure liquid refrigerant will increase the degree of subcooling if it continues to exotherm, thereby increasing the cooling capacity of the system cycle.

Based on this, the present invention proposes a new heating cycle system and an air conditioner.

Summary of the invention

In order to solve the above problems in the prior art, that is, in order to improve the air conditioning heating cycle effect, the present invention provides an air conditioning heating and heating cycle system, comprising a compressor connected in series in a main circuit, an indoor heat exchanger, and a first throttling device. And an outdoor heat exchanger, a bypass circuit is disposed between the main circuit and the compressor; a portion of the refrigerant flowing out of the indoor heat exchanger flows into the bypass circuit, and another portion flows along the main circuit.

In a preferred embodiment of the above air conditioning heating and heating system, the bypass circuit is provided with a second throttle device for controlling the amount of refrigerant entering the bypass circuit.

In a preferred embodiment of the above air conditioning heating and heating system, the air conditioning heating and heating system further includes a heat exchanger, and the main circuit and the bypass circuit pass through the heat exchanger, and the heat exchanger is used for The refrigerant in the bypass circuit and the refrigerant in the main circuit are exchanged.

In a preferred embodiment of the above air conditioning heating and heating system, the main circuit passing through the heat exchanger is a section between the indoor heat exchanger outlet and the first throttle device.

In a preferred embodiment of the above air conditioning heating and heating system, the bypass circuit through the heat exchanger is a section between the compressor and the second throttle device.

In a preferred embodiment of the above air conditioning heating and heating system, the compressor is provided with a gas-liquid separator, and a gaseous refrigerant passing through the gas-liquid separator is sucked by the compressor.

The present invention also provides an air conditioner which is equipped with the above-described air conditioning heating and circulation system.

In a preferred embodiment of the above air conditioner, the air conditioner is provided with a four-way valve for switching the air conditioner between a refrigeration cycle and a heating cycle.

In a preferred embodiment of the above air conditioner, the air conditioner is equipped with the above air conditioning heating and heating system; when the air conditioner is refrigerating, the second throttle device is closed.

In a preferred embodiment of the air conditioner, the air conditioner further includes a bypass defrosting circuit disposed between the compressor and the outdoor heat exchanger, and the bypass defrosting circuit is provided with a third Throttling device.

The beneficial effects of the technical scheme of the present invention are as follows: (1) The system supercooling section can be effectively increased, that is, the medium-temperature high-pressure liquid refrigerant flowing out from the indoor heat exchanger can continue to release heat and cool before passing through the first throttling device; (2) The medium-temperature high-pressure liquid refrigerant flowing out of the indoor heat exchanger is subjected to evaporation and heat absorption in two ways, which is equivalent to increasing the evaporation area of the refrigerant, thereby effectively improving the heat exchange capacity of the system.

DRAWINGS

1 is a schematic structural view of an air conditioning heating and heating cycle system of the present invention;

Fig. 2 is a schematic view showing the structure of an air conditioner of the present invention.

Detailed ways

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the scope of the present invention.

As shown in FIG. 1, the air conditioning heating and heating system of the present invention includes a compressor 1, an indoor heat exchanger 2, a first throttle device 3, and an outdoor heat exchanger 4 connected in series in a main circuit. Among them, a bypass circuit N is provided between the main circuit and the compressor 1; a part of the refrigerant flowing out of the indoor heat exchanger 2 flows into the bypass circuit N, and the other portion flows along the main circuit.

Specifically, during the heating cycle operation, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 reaches the indoor heat exchanger 2 (the condenser at this time) to perform heat exchange, and becomes a medium-temperature high-pressure liquid refrigerant, and a medium-temperature high-pressure liquid refrigerant. Along the main circuit, it reaches point A. At this time, the refrigerant circulation is divided into two paths, one of which continues to flow along the main circuit, and the other of which flows into the bypass circuit N.

In the present embodiment, the bypass circuit N is provided with a second throttle device 5 for controlling the amount of refrigerant entering the bypass circuit N. Specifically, the medium-temperature high-pressure liquid refrigerant at point A forms a low-temperature low-pressure gas-liquid mixed liquid refrigerant through the second throttling device 5.

In the present embodiment, the heating cycle system further includes a heat exchanger 6 through which the main circuit and the bypass circuit N pass. Specifically, the main circuit passing through the heat exchanger 6 is a section between the outlet of the indoor heat exchanger 2 (specifically, point A in FIG. 1) and the first throttle device 3; bypassing through the heat exchanger 6 The circuit N is a section between the compressor 1 and the second throttle device 5. That is to say, during the heating cycle operation, the medium-temperature high-pressure liquid refrigerant is divided into two paths at point A, one through the heat exchanger 6 → the first throttling device 3 → the outdoor heat exchanger 4; the other pass through the first Two throttle device 5 → heat exchanger 6 → compressor 1.

The heat exchanger 6 is for exchanging heat between the refrigerant in the bypass circuit N and the refrigerant in the main circuit. In this way, the low-temperature and low-pressure gas-liquid mixed refrigerant formed by the second expansion device 5 in the bypass circuit N and the medium-temperature high-pressure liquid refrigerant that has not passed through the first throttle device 3 in the main circuit can be exchanged by heat. 6 heat exchange. For example, the heat exchanger 6 may be a water tank containing water (the heat exchanger 6 may be in any other suitable form, the water tank is merely illustrative), and the medium-temperature high-pressure liquid refrigerant flowing out of the indoor heat exchanger 2 passes through Before the first throttling device 3, first, heat exchange with the water in the heat exchanger 6, and the low-temperature and low-pressure gas-liquid mixed refrigerant formed by the second throttling device 5 is also exchanged with the heat when flowing in the bypass circuit N. The water in the heat exchange. That is, the gas-liquid mixed refrigerant in the bypass circuit N exchanges heat with the medium-temperature high-pressure liquid refrigerant in the main circuit.

The heat exchanger 6 realizes the heat exchange between the gas-liquid mixed state refrigerant in the bypass circuit N and the medium temperature and high pressure liquid refrigerant in the main circuit, and can effectively increase the system supercooling section, that is, the point A to the first throttling device. The refrigerant in the section 3 can continue to release heat and cool down; on the other hand, the medium-temperature high-pressure liquid refrigerant flowing out of the indoor heat exchanger 2 is subjected to evaporation and heat absorption in two ways, that is, the first throttling device 3 and the second throttling device. 5, this is equivalent to increasing the evaporation area of the refrigerant, thus effectively improving the heat transfer capacity of the system.

More specifically, the low-temperature low-pressure gas liquid refrigerant in the bypass circuit N is absorbed by the heat exchanger 6 and evaporated to the return port of the compressor 1; the medium-temperature high-pressure liquid refrigerant in the main circuit is discharged through the heat exchanger 6 Then, the first throttling device 3 forms a low-temperature low-pressure gas-liquid mixed state refrigerant, enters the outdoor heat exchanger 4 for heat exchange, and then returns to the gas return port of the compressor 1.

Preferably, the compressor 1 is provided with a gas-liquid separator 11, and the gaseous refrigerant entering the compressor 1 from the bypass circuit N or the main circuit first passes through the gas-liquid separator 11 and is then sucked by the compressor 1 to open the lower portion. A cycle.

In summary, the heating cycle system of the present invention can effectively increase the system supercooling section, that is, the point A to the first throttling device, by exchanging the refrigerant in the bypass circuit N with the refrigerant in the main circuit. The refrigerant in the section 3 can continue to release heat and cool down; on the other hand, the medium-temperature high-pressure liquid refrigerant flowing out of the indoor heat exchanger 2 is subjected to evaporation and heat absorption in two ways, that is, the first throttling device 3 and the second throttling device. 5, this is equivalent to increasing the evaporation area of the refrigerant, thus effectively improving the heat transfer capacity of the system.

The present invention also provides an air conditioner which is equipped with the above-described air conditioning heating and circulation system. The purpose of the above heating cycle system is to strengthen the heat generation, perform charging calculation according to the multiple refrigerants required for ultra-low temperature heating, and increase the mass flow rate and heat exchange amount during the heating cycle, and the air conditioner of the present invention is installed in the above system. After the thermal cycle system, a four-way valve can also be provided to switch the air conditioner between the refrigeration cycle and the heating cycle.

Specifically, referring to Fig. 2, Fig. 2 is a schematic structural view of an air conditioner of the present invention. As shown in FIG. 2, in the present embodiment, the air conditioner includes the above-described heating cycle system (refer to the above description, which will not be described herein), and the four-way valve 7. The air conditioner can switch between the cooling mode and the heating mode through the four-way valve 7, and the four-way valve 7 is switched to the refrigeration cycle in FIG. The second throttle device 5 can be closed during cooling operation of the air conditioner.

Preferably, with continued reference to Fig. 2, the air conditioner further includes a bypass defrost circuit M disposed between the compressor 1 and the outdoor heat exchanger 4, and the bypass defrost circuit M is provided with a third throttle device 8. During the cooling/heating operation, the third throttle device 8 is closed and does not participate in the refrigeration/heating cycle. When defrosting is required during the heating process, the third throttling device 8 is opened, and the high-temperature and high-pressure refrigerant discharged from the compressor 1 is divided into two paths, and all the way enters the indoor heat exchanger 2 for heat exchange, bringing heat to the room; another way Defrosting is carried out through the first throttling device 8 into the frosted outdoor heat exchanger 4, thus ensuring continuous operation of the heating.

Heretofore, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings, but it is obvious to those skilled in the art that the scope of the present invention is obviously not limited to the specific embodiments. Those skilled in the art can make equivalent changes or substitutions to the related technical features without departing from the principles of the present invention, and the technical solutions after the modifications or replacements fall within the scope of the present invention.

Claims

An air conditioning heating and heating system comprising a compressor connected in series in a main circuit, an indoor heat exchanger, a first throttling device and an outdoor heat exchanger,

The utility model is characterized in that a bypass circuit is arranged between the main circuit and the compressor;

A portion of the refrigerant flowing out of the indoor heat exchanger flows into the bypass circuit, and another portion flows along the main circuit.
The air conditioning heating and heating cycle system according to claim 1, wherein said bypass circuit is provided with a second throttle device for controlling the amount of refrigerant entering said bypass circuit .
The air conditioning heating and heating cycle system according to claim 2, wherein the air conditioning heating and heating system further comprises a heat exchanger, and the main circuit and the bypass circuit pass through the heat exchanger,

The heat exchanger is configured to exchange heat between the refrigerant in the bypass circuit and the refrigerant in the main circuit.
The air conditioning heating and circulation system according to claim 3, wherein the main circuit passing through the heat exchanger is a section between the indoor heat exchanger outlet and the first throttle device.
The air conditioning heating and circulation system according to claim 4, wherein the bypass circuit passing through the heat exchanger is a section between the compressor and the second throttle device.
The air conditioning heating and circulation system according to any one of claims 1 to 5, wherein the compressor is provided with a gas-liquid separator, and a gaseous refrigerant passing through the gas-liquid separator is sucked by the compressor .
An air conditioner, characterized in that the air conditioner is equipped with the air conditioning heating cycle system according to any one of claims 1 to 6.
The air conditioner according to claim 7, wherein said air conditioner is provided with a four-way valve for switching said air conditioner between a refrigeration cycle and a heating cycle.
The air conditioner according to claim 8, wherein the air conditioner is equipped with the air conditioning heating cycle system according to any one of claims 4 to 6;

The second throttle device is closed when the air conditioner is refrigerating.
The air conditioner according to any one of claims 7 to 9, wherein the air conditioner further includes a bypass defrosting circuit disposed between the compressor and the outdoor heat exchanger, A third throttle device is disposed in the bypass defrost circuit.