CN207702631U - Air conditioner cooling cycle system and air conditioner - Google Patents

Abstract

The utility model belongs to the technical field of air conditioners, in particular to an air conditioner refrigeration cycle system and an air conditioner. In order to improve the refrigeration cycle effect of the air conditioner and reduce energy consumption, the system of the present invention includes a compressor, an outdoor heat exchanger, a first throttling device and an indoor heat exchanger connected in series in the main circuit. The main circuit is also connected in series with the first A gas-liquid separator, and a bypass circuit is provided between the first gas-liquid separator and the compressor; the refrigerant flowing out of the outdoor heat exchanger flows into the first throttling device After a gas-liquid separator, the gaseous refrigerant flows to the compressor along the bypass circuit, and the liquid refrigerant flows to the indoor heat exchanger along the main circuit. The utility model makes the pressure drop loss of the gaseous refrigerant in the system small, reduces the energy consumption of the system, and at the same time can increase the return air pressure of the system, increase the exhaust pressure and condensation temperature of the system, thereby increasing the convective heat transfer temperature difference of the refrigerant in the outdoor heat exchanger, To achieve the purpose of increasing the cooling capacity of the system.

Description

Air Conditioning Refrigeration Cycle System and Air Conditioner

technical field

The utility model belongs to the technical field of air conditioners, in particular to an air conditioner refrigeration cycle system and an air conditioner.

Background technique

The existing air-conditioning refrigeration cycle system usually consists of a condenser, a throttling device, an evaporator, and a compressor to form a refrigeration cycle loop. It flows into a low-temperature and low-pressure liquid, and then enters the evaporator to absorb heat and evaporate to complete the refrigeration cycle.

Refrigerant flows in the air-conditioning refrigeration cycle system, which has the physical characteristics of latent heat of vaporization and specific heat capacity at equal pressure, and participates in heat exchange with the environment. The cooling capacity per unit mass of a refrigerant is an important performance characteristic, meaning that the more mass a refrigerant has to a certain extent, the better the cooling or heating effect. For example, in a high-temperature environment, if the condensing pressure on the condensing side is high and the condensing temperature is high during refrigeration operation, it means that the average convective heat transfer temperature difference between the refrigerant and the external environment is greater, which means that when the condensing area and convective heat transfer coefficient equal Timing, the greater the cooling capacity. In addition, when the refrigerant is exchanging heat, more than 95% of the heat transfer heat comes from the latent heat of vaporization in the two-phase region, while the isobaric specific heat capacity of the one-way region (pure liquid, pure gas) is relatively small, and the heat transfer accounts for The proportion of the total system circulation is small. In addition, the gaseous refrigerant has a large pressure drop in the pipeline, which is the main source of system cycle pressure loss, which will increase the amount of cycle work, that is, increase the energy consumption of the refrigeration cycle system.

Based on this, the utility model proposes a new refrigeration cycle system and an air conditioner.

Utility model content

In order to solve the above-mentioned problems in the prior art, that is, in order to improve the effect of the air-conditioning refrigeration cycle and reduce energy consumption, the utility model provides an air-conditioning refrigeration cycle system, including a compressor connected in series in the main circuit, an outdoor heat exchanger, a first A throttling device and an indoor heat exchanger, the main circuit is also connected in series with a first gas-liquid separator, and a bypass circuit is provided between the first gas-liquid separator and the compressor; from the outdoor After the refrigerant flowing out of the heat exchanger flows into the first gas-liquid separator through the first throttling device, the gaseous refrigerant flows to the compressor along the bypass circuit, and the liquid refrigerant flows to the compressor along the main circuit. Indoor heat exchanger.

In a preferred embodiment of the above-mentioned air-conditioning and refrigeration cycle system, the air-conditioning and refrigeration cycle system further includes a heat exchanger, both the main circuit and the bypass circuit pass through the heat exchanger, and the heat exchanger is used to make the heat exchange between the refrigerant in the bypass circuit and the refrigerant in the main circuit.

In a preferred embodiment of the above-mentioned air-conditioning and refrigeration cycle system, the main circuit passing through the heat exchanger is a section located between the outlet of the outdoor heat exchanger and the first throttling device.

In a preferred embodiment of the above-mentioned air-conditioning and refrigeration cycle system, a second throttling device is provided on the bypass circuit, and the second throttling device is used to control the amount of gaseous refrigerant entering the bypass circuit.

In a preferred embodiment of the above-mentioned air-conditioning and refrigeration cycle system, the bypass circuit passing through the heat exchanger is a section located between the compressor and the second throttling device.

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

The utility model also provides an air conditioner, the air conditioner is installed with the above-mentioned air-conditioning refrigeration circulation system.

In a preferred embodiment of the above air conditioner, the air conditioner is provided with a four-way valve, and the four-way valve is used to switch 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 refrigeration cycle system; when the air conditioner is in the heating cycle, the second throttling device is closed.

In a preferred embodiment of the above-mentioned air conditioner, the air conditioner further includes a bypass defrosting circuit arranged between the compressor and the outdoor heat exchanger, and the bypass defrosting circuit is provided with a third section streaming device.

The utility model adds a first gas-liquid separator to the main circuit to form a bypass circuit with the compressor, and the refrigerant in the bypass circuit and the refrigerant in the end pipeline of the outdoor heat exchanger are heated through the heat exchanger. exchange, the beneficial effects of the technical solution of the utility model are: (1) the dryness of the refrigerant entering the evaporator (indoor heat exchanger) is improved, the pressure drop of the liquid refrigerant is small, and the heat transfer capacity of the latent heat of vaporization is high; (2) the gaseous refrigerant is directly refluxed To the compressor, the pressure drop loss is small, and the heat exchange at the end of the condenser (outdoor heat exchanger) will increase the subcooling degree of the condenser, reduce the enthalpy value of the condenser outlet, and increase the cooling capacity of the whole machine; ( 3) The gaseous refrigerant directly returns to the compressor, which will increase the return air pressure of the system, increase the exhaust pressure, and increase the condensation temperature, thereby increasing the convective heat transfer temperature difference of the condenser and increasing the cooling capacity of the system.

Description of drawings

Fig. 1 is the structural representation of the air-conditioning refrigeration cycle system of the present utility model;

Fig. 2 is a heating principle diagram of the air conditioner of the present invention.

Detailed ways

Preferred embodiments of the present utility model 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 principle of the utility model, and are not intended to limit the protection scope of the utility model.

As shown in Figure 1, the air-conditioning refrigeration cycle system of the present invention includes a compressor 1 connected in series in the main circuit, an outdoor heat exchanger 2, a first throttling device 3, an indoor heat exchanger 4 and a first Gas-liquid separator 5. Wherein, a bypass circuit N is provided between the first gas-liquid separator 5 and the compressor 1, and the refrigerant flowing out from the outdoor heat exchanger 2 flows into the first gas-liquid separator 5 through the first throttling device 3, and the gaseous refrigerant The liquid refrigerant flows to the compressor 1 along the bypass circuit N, and the liquid refrigerant flows to the indoor heat exchanger 2 along the main circuit.

Specifically, when the refrigeration cycle is running, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 reaches the outdoor heat exchanger 2 (a condenser at this time) for heat exchange, and becomes a medium-temperature and high-pressure liquid refrigerant. Then, the medium-temperature and high-pressure liquid refrigerant flows out from the outlet of the outdoor heat exchanger 2 , continues to flow along the main circuit, passes through the first throttling device 3 , forms a low-temperature and low-pressure gas-liquid mixed refrigerant, and flows into the first gas-liquid separator 5 . At this time, the gaseous refrigerant flowing out of the first gas-liquid separator 5 flows along the bypass circuit N to the air return port of the compressor 1, and the liquid refrigerant flowing out of the first gas-liquid separator 5 flows along the main circuit to the indoor heat exchanger 4 (the evaporator at this time) performs heat exchange, evaporates into a gaseous refrigerant, and then returns to the air return port of the compressor 1. Compressor 1 sucks gaseous refrigerant and starts the next refrigeration cycle.

Based on the description in the background technology, the refrigeration cycle system of the present invention, that is, the first gas-liquid separator 5 is added to the main circuit to form a bypass circuit N between it and the compressor 1. The dryness of the refrigerant in the heat exchanger 4 (the liquid refrigerant separated by the first gas-liquid separator 5 enters the indoor heat exchanger 4), and the pressure drop of the liquid refrigerant in the cycle is small, and the heat transfer capacity of the latent heat of vaporization is high; on the other hand, The gaseous refrigerant separated by the first gas-liquid separator 5 directly flows back to the compressor 1 along the bypass circuit N, without going through the indoor heat exchanger 4, so that the pressure drop loss of the gaseous refrigerant is small, reducing the energy consumption of the system, and at the same time increasing The return air pressure of the system increases the exhaust pressure and condensation temperature of the system, thereby increasing the convective heat transfer temperature difference of the refrigerant in the outdoor heat exchanger 1, and achieving the purpose of increasing the cooling capacity of the system.

Preferably, the bypass circuit N is provided with a second throttling device 6 for controlling the amount of gaseous refrigerant entering the bypass circuit N.

In a preferred embodiment, referring to FIG. 1 , the air-conditioning refrigeration cycle system further includes a heat exchanger 7 through which both the main circuit and the bypass circuit N pass. Specifically, the main circuit passing through the heat exchanger 7 is a section between the outlet of the outdoor heat exchanger 2 and the first throttling device 3; the bypass circuit N passing through the heat exchanger 7 is located between the compressor 1 and the second Section between throttling devices 6. That is to say, when the refrigeration cycle is running, the direction along which the refrigerant flows is heat exchanger 7 → first throttling device 3 → first gas-liquid separator 5 → second throttling device 6 → heat exchanger 7 → compression Machine 1.

The heat exchanger 7 is used to exchange heat between the refrigerant in the bypass circuit N and the refrigerant in the main circuit. For example, the heat exchanger 7 may be a water tank filled with water (the heat exchanger 7 may also be in any other suitable form, and the water tank is only an exemplary illustration), and the bypass circuit N and the main circuit respectively pass through the water tank. Specifically, the medium-temperature and high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 2 first passes through the heat exchanger 7, exchanges heat with the water in the heat exchanger 7, and then passes through the first throttling device 3 to form a low-temperature and low-pressure gas-liquid The mixed refrigerant flows into the first gas-liquid separator 5 . At this time, the gaseous refrigerant flowing out of the first gas-liquid separator 5 passes through the second throttling device 6 and then passes through the heat exchanger 7 , and exchanges heat with the water in the heat exchanger 7 . That is to say, the gaseous refrigerant in the bypass circuit N exchanges heat with the medium-temperature and high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 2. In this way, the subcooling degree of the outdoor heat exchanger 2 can be increased and the outdoor heat exchange rate can be reduced. The enthalpy value at the outlet of the device increases the cooling capacity of the entire refrigeration cycle.

Preferably, the compressor 1 is provided with a second gas-liquid separator 11, whether the gaseous refrigerant entering the compressor 1 from the bypass circuit N or the main circuit first passes through the second gas-liquid separator 11, and then is sucked by the compressor 1 , thus starting the next cycle.

In summary, the beneficial effects of the refrigeration cycle system of the present utility model are: (1) the dryness of the refrigerant entering the evaporator (indoor heat exchanger) is improved, the pressure drop of the liquid refrigerant is small, and the heat transfer capacity of the latent heat of vaporization is high; (2) ) The gaseous refrigerant directly flows back to the compressor, the pressure drop loss is small, and the heat exchange at the end of the condenser (outdoor heat exchanger) will increase the subcooling degree of the condenser, reduce the enthalpy value of the condenser outlet, and make the cooling capacity of the whole machine (3) The gaseous refrigerant directly returns to the compressor, which will increase the return air pressure of the system, increase the exhaust pressure, and increase the condensation temperature, thereby increasing the convective heat transfer temperature difference of the condenser and increasing the cooling capacity of the system.

The utility model also provides an air conditioner, the air conditioner is installed with the above-mentioned air conditioner refrigeration cycle system. The purpose of the above-mentioned air-conditioning refrigeration cycle system is to strengthen the cooling capacity, calculate the refrigerant charging amount according to the high-temperature refrigeration operating conditions, and increase the mass flow rate and heat transfer during the refrigeration cycle. Finally, a four-way valve can also be set to switch between the refrigeration cycle and the heating cycle of the air conditioner.

Specifically, refer to FIG. 2 , which is a schematic diagram of the heating principle of the air conditioner of the present invention. As shown in FIG. 2 , in this embodiment, the air conditioner includes the above-mentioned refrigerating cycle system (for details, refer to the above description, which will not be repeated here), and a four-way valve 8 . The air conditioner can switch between the cooling mode and the heating mode through the four-way valve 8, and FIG. 2 shows that the four-way valve 8 switches to the heating cycle. When the air conditioner is in heating operation, the second throttling device 6 is closed. This purpose is, because the area (such as the Middle East area) that needs strong cooling function, heating working condition is not very bad, so relative heating cycle does not need so much, stores with the first gas-liquid separator 5, can reduce the heating time. Power consumption during thermal cycling improves energy efficiency.

Preferably, continuing to refer to FIG. 2 , the air conditioner further includes a bypass defrosting circuit M disposed between the compressor 1 and the outdoor heat exchanger 2 , and the bypass defrosting circuit M is provided with a third throttling device 9 . During cooling/heating operation, the third throttling device 9 is closed and does not participate in the cooling/heating cycle. When defrosting is required during the heating process, the third throttling device 9 is opened, and the high-temperature and high-pressure refrigerant discharged by the compressor 1 is divided into two paths, and one path enters the indoor heat exchanger 4 (condenser at this time) for heat exchange, and the Heat is brought from the room, and the other path enters the frosted outdoor heat exchanger 2 (evaporator at this time) through the first throttling device 9 for defrosting, thus ensuring the continuous operation of heating.

So far, the technical solution of the utility model has been described in conjunction with the preferred implementations shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific implementations. On the premise of not departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the utility model.

Claims (10)

1. An air-conditioning refrigeration cycle system, comprising a compressor connected in series in the main circuit, an outdoor heat exchanger, a first throttling device and an indoor heat exchanger, characterized in that, A first gas-liquid separator is also connected in series on the main circuit, and a bypass circuit is provided between the first gas-liquid separator and the compressor; After the refrigerant flowing out of the outdoor heat exchanger flows into the first gas-liquid separator through the first throttling device, the gaseous refrigerant flows to the compressor along the bypass circuit, and the liquid refrigerant flows along the main The loop flows to the indoor heat exchanger. 2. The air-conditioning refrigeration cycle system according to claim 1, characterized in that, the air-conditioning refrigeration cycle system further comprises a heat exchanger, and both the main circuit and the bypass circuit pass through the heat exchanger, The heat exchanger is used for exchanging heat between the refrigerant in the bypass circuit and the refrigerant in the main circuit. 3. The air-conditioning and refrigeration cycle system according to claim 2, wherein the main circuit passing through the heat exchanger is a section between the outlet of the outdoor heat exchanger and the first throttling device. 4. The air-conditioning refrigeration cycle system according to claim 3, wherein a second throttling device is provided on the bypass circuit, and the second throttling device is used to control the gaseous state entering the bypass circuit. Refrigerant volume. 5 . The air-conditioning and refrigeration cycle system according to claim 4 , wherein the bypass circuit passing through the heat exchanger is a section located between the compressor and the second throttling device. 6. The air-conditioning refrigeration cycle system according to any one of claims 1 to 5, wherein the compressor is provided with a second gas-liquid separator, and the gaseous refrigerant passing through the second gas-liquid separator is The compressor sucks. 7. An air conditioner, characterized in that the air conditioner is equipped with the air conditioning refrigeration cycle system according to any one of claims 1 to 6. 8 . The air conditioner according to claim 7 , wherein the air conditioner is provided with a four-way valve, and the four-way valve is used to switch the air conditioner between a refrigeration cycle and a heating cycle. 9. The air conditioner according to claim 8, characterized in that, the bypass circuit is provided with a second throttling device, When the air conditioner is in a heating cycle, the second throttling device is closed. 10. The air conditioner according to any one of claims 7 to 9, characterized in that the air conditioner further comprises a bypass defrosting circuit arranged between the compressor and the outdoor heat exchanger, The bypass defrosting circuit is provided with a third throttling device.