CN208075218U - Air conditioner heat pump system - Google Patents

Abstract

The utility model provides an air conditioner heat pump system, including heat transfer circulating line, enthalpy-increasing pipeline, moisturizing pipeline and hydrojet pipeline, heat transfer circulating line includes compressor, cross valve, indoor heat exchanger, throttling arrangement and outdoor heat exchanger, enthalpy-increasing pipeline one end with the tonifying qi mouth intercommunication of compressor. The utility model provides an air conditioner heat pump system, through setting up the enthalpy increasing pipeline, can guarantee normal work when air conditioner heat pump system is in lower ambient temperature, the refrigerant mass circulation volume of compressor under the same rotational speed has been improved, make the compressor motor obtain better cooling, reduce exhaust temperature, through setting up gas supplementing pipeline and hydrojet pipeline, pressure when the compression that can increase the compressor finishes, and then realize the improvement of system pressure ratio, partial refrigerant liquid gets into the compressor through the hydrojet valve simultaneously, improve refrigerant circulation volume, reduce the compressor degree of superheat of breathing in, thereby reduce the exhaust degree of superheat.

Description

Air conditioning heat pump system

technical field

The utility model relates to the technical field of air treatment equipment, in particular to an air-conditioning heat pump system.

Background technique

Due to its high energy efficiency and environmental protection, air-conditioning heat pump products are more and more widely used as heating and heating. They have been widely used in warm areas, but they are rarely used in cold areas. During heating operation in cold regions, the outdoor ambient temperature is extremely low, resulting in low evaporation pressure of the system, while the compression ratio of conventional single-stage vapor compression refrigeration cycle system limits the increase of condensation pressure, which in turn causes poor heating effect. In addition, the low evaporating pressure leads to a large specific volume of refrigerant on the suction side of the compressor, and the mass flow rate of the refrigerant in the compressor cycle is small. The refrigerant cycle cannot effectively take away the heat emitted by the compressor motor, causing the compressor to The motor cannot be well cooled and cannot run reliably for a long time.

Utility model content

In order to solve the above-mentioned technical problems, an air-conditioning heat pump system capable of realizing long-term reliable operation in cold regions is provided.

An air-conditioning heat pump system, comprising a heat exchange circulation pipeline, an air supply pipeline and a liquid injection pipeline, the heat exchange circulation pipeline includes a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger, the booster One end of the enthalpy pipeline communicates with the air supply port of the compressor, the other end communicates with the communication pipeline between the indoor heat exchanger and the throttling device, and one end of the air supply pipeline communicates with the air supply port of the compressor. The gas port is connected, the other end is connected with the exhaust port of the compressor, one end of the liquid injection pipeline is connected with the communication pipeline between the indoor heat exchanger and the throttling device, and the other end is connected with the The suction port of the compressor is connected.

The air-conditioning heat pump system also includes an enthalpy increasing pipeline, one end of the enthalpy increasing pipeline communicates with the air supply port of the compressor, and the other end communicates with the communication pipeline between the indoor heat exchanger and the throttling device connected.

The enthalpy-increasing pipeline includes an enthalpy-increasing valve, an economizer, and an enthalpy-increasing throttling valve. The economizer includes a first heat exchange pipeline and a second heat exchange pipeline. One end of the enthalpy-increasing valve is connected to the compressor The air supply port of the machine is connected, the other end is connected with one end of the second heat exchange pipeline, one end of the first heat exchange pipeline is connected with the indoor heat exchanger, and the other end is connected with the throttling device, so One end of the enthalpy-increasing throttle valve communicates with the communication pipeline between the indoor heat exchanger and the first heat exchange pipeline, and the other end of the second heat exchange pipeline is far away from the enthalpy-increasing valve. Connected at one end.

The air supply pipeline includes an air supply valve, one end of the air supply valve communicates with the air supply port of the compressor, and the other end communicates with the exhaust port of the compressor.

The liquid injection pipeline includes a liquid injection valve, one end of the liquid injection valve communicates with the suction port of the compressor, and the other end communicates with the communication pipeline between the indoor heat exchanger and the throttling device connected.

The enthalpy-increasing pipeline includes an enthalpy-increasing valve, an economizer, and an enthalpy-increasing throttling valve. The economizer includes a first heat exchange pipeline and a second heat exchange pipeline. One end of the enthalpy-increasing valve is connected to the compressor The air supply port of the machine is connected, the other end is connected with one end of the second heat exchange pipeline, one end of the first heat exchange pipeline is connected with the indoor heat exchanger, and the other end is connected with the throttling device, so One end of the enthalpy-increasing throttle valve communicates with the communication pipeline between the indoor heat exchanger and the first heat exchange pipeline, and the other end of the second heat exchange pipeline is far away from the enthalpy-increasing valve. One end communicates, and the air supply pipeline includes an air supply valve, one end of the air supply valve communicates with the air supply port of the compressor, and the other end communicates with the exhaust port of the compressor, and the liquid injection pipeline includes A liquid injection valve, one end of the liquid injection valve communicates with the suction port of the compressor, and the other end communicates with the communication pipeline between the indoor heat exchanger and the throttling device.

The enthalpy increasing valve, the air supply valve and the liquid injection valve are electronic expansion valves or solenoid valves.

The enthalpy increasing throttle valve is an electronic expansion valve.

The suction port of the compressor is provided with a first pressure sensor, the air supply port of the compressor is provided with a second pressure sensor, and the discharge port of the compressor is provided with a third pressure sensor and an exhaust temperature sensor, so An outdoor ambient temperature sensor is arranged on the outdoor heat exchanger.

A control method for the above-mentioned air-conditioning heat pump system, characterized in that it includes:

In normal mode, the enthalpy-increasing throttle valve, the air supplement valve, and the liquid injection valve are closed;

Enthalpy increase mode, the enthalpy increase throttle valve and the enthalpy increase valve are opened, and the air supplement valve and the liquid injection valve are closed;

In the high pressure ratio mode, the enthalpy-increasing throttle valve is closed, and the air supplement valve and the liquid injection valve are opened.

The control method also includes:

Detect target ambient temperature T1, T2 (T1>T2) and outdoor ambient temperature t1;

If T1≤t1, the air-conditioning heat pump system enters the normal mode;

If T2<t1<T1, the air-conditioning heat pump system enters the enthalpy increasing mode;

If t1≤T2, the air-conditioning heat pump system enters the high pressure ratio mode.

The control method also includes in the high pressure ratio mode:

Detect the suction pressure p1 and discharge pressure p2 of the compressor, and calculate the air supply pressure P=f(p1, p2);

Adjust the opening of the air supply valve according to the air supply pressure P.

The control method also includes in the high pressure ratio mode:

Set the target exhaust temperature range {Tmin, Tmax};

Detect the exhaust temperature t2, and adjust the opening of the liquid injection valve so that t2 is within the range of {Tmin, Tmax}.

The air-conditioning heat pump system provided by the utility model can ensure normal operation when the air-conditioning heat pump system is at a lower ambient temperature by setting an enthalpy-increasing pipeline. The agent takes away the heat of the compressor motor, so that the compressor motor can be cooled better, and the exhaust temperature can be reduced. By setting the air supply pipeline and the liquid spray pipeline, the pressure at the end of the compressor compression can be increased, and the system pressure can be realized. At the same time, part of the refrigerant liquid enters the compressor through the liquid injection valve, which increases the refrigerant circulation, reduces the compressor suction superheat, and thus reduces the exhaust superheat.

Description of drawings

Fig. 1 is the structural representation of the air-conditioning heat pump system provided by the utility model;

In the picture:

1. Heat exchange circulation pipeline; 2. Enthalpy increasing pipeline; 3. Air supply pipeline; 4. Liquid injection pipeline; 11. Compressor; 12. Four-way valve; 13. Indoor heat exchanger; 14. Throttling Device; 15. Outdoor heat exchanger; 21. Enthalpy increasing valve; 22. Economizer; 23. Enthalpy increasing throttle valve; 24. First heat exchange pipeline; 25. Second heat exchange pipeline; 31. Air supply Valve; 41, liquid injection valve.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, not to limit the utility model.

The air-conditioning heat pump system shown in Figure 1 includes a heat exchange circulation pipeline 1, an air supply pipeline 3 and a liquid injection pipeline 4, and the heat exchange circulation pipeline 1 includes a compressor 11, an indoor heat exchanger 13, a throttling device 14 and an outdoor heat exchanger 15, one end of the enthalpy increasing pipeline 2 communicates with the gas supply port of the compressor 11, and the other end communicates with the indoor heat exchanger 13 and the throttling device 14 One end of the air supply pipeline 3 is connected with the air supply port of the compressor 11, the other end is connected with the exhaust port of the compressor 11, and one end of the liquid injection pipeline 4 is connected with the indoor exchange The communication pipeline between the heater 13 and the throttling device 14 is communicated, and the other end is communicated with the suction port of the compressor 11. By setting the air supply pipeline 3 and the liquid injection pipeline 4, the compressor can be increased. 11 pressure at the end of compression, thereby increasing the system pressure ratio, and at the same time, part of the refrigerant liquid enters the compressor 11 through the liquid injection valve 41, increasing the refrigerant circulation, reducing the suction superheat of the compressor 11, thereby reducing the discharge pressure. superheat.

The air-conditioning heat pump system also includes an enthalpy increasing pipeline 2, one end of the enthalpy increasing pipeline 2 communicates with the air supply port of the compressor 11, and the other end communicates with the indoor heat exchanger 13 and the throttling device 14. The connecting pipeline between them is connected. By setting the enthalpy increasing pipeline 2, it can ensure the normal operation of the air-conditioning heat pump system at a lower ambient temperature, improve the refrigerant quality circulation of the compressor 11 at the same speed, and increase the amount of refrigerant entering the compressor. The amount of refrigerant, so that more refrigerant is used to take away the heat of the motor of the compressor 11, so that the motor of the compressor 11 can be cooled better and the exhaust temperature can be reduced.

The heat exchange circulation pipeline 1 further includes a four-way valve 12, and the four-way valve 12 can switch the heat exchange circulation pipeline 1 to perform a heating cycle or a refrigeration cycle.

The enthalpy-increasing pipeline 2 includes an enthalpy-increasing valve 21, an economizer 22, and an enthalpy-increasing throttle valve 23. The economizer 22 includes a first heat exchange pipeline 24 and a second heat exchange pipeline 25. The enthalpy increase One end of the valve 21 communicates with the air supply port of the compressor 11 , the other end communicates with one end of the second heat exchange pipeline 25 , and one end of the first heat exchange pipeline 24 communicates with the indoor heat exchanger 13 , the other end communicates with the throttling device 14, one end of the enthalpy-increasing throttle valve 23 communicates with the communication pipeline between the indoor heat exchanger 13 and the first heat exchange pipeline 24, and the other end It communicates with the end of the second heat exchange pipeline 25 away from the enthalpy-increasing valve 21, and the medium-temperature and medium-pressure refrigerant liquid condensed in the indoor heat exchanger 13 is divided into two parts, and one part enters the economizer 22 to connect The port is further cooled, and part of it enters the connection port of the economizer 22 after throttling and decompression by the enthalpy-increasing throttle valve 23. Since the temperature after throttling and decompression is lower than that of the refrigerant liquid at the connection port, heat exchange occurs with it and absorption The heat is evaporated into a low-temperature and low-pressure refrigerant gas that flows out from the connection port, enters the gas supply port of the compressor 11 through the enthalpy increasing valve 21, mixes with the refrigerant gas that has been compressed inside the compressor 11, and continues to be compressed, and the low-temperature gas sucked through the gas supply port The low-pressure refrigerant gas increases the refrigerant quality circulation of the compressor 11 at the same speed, thereby improving the heating effect, and at the same time increases the amount of refrigerant entering the compressor, thereby using more refrigerant to turn the compressor The heat of the motor 11 is taken away, so that the motor of the compressor 11 is better cooled and the exhaust gas temperature is reduced.

The gas supply pipeline 3 includes a gas supply valve 31, one end of the gas supply valve 31 communicates with the gas supply port of the compressor 11, and the other end communicates with the exhaust port of the compressor 11. , part of the exhaust gas from the compressor 11 can be directly sent to the air supply port of the compressor 11, and the compression ratio of the compressor 11 can be increased, thereby realizing an increase in the system pressure ratio. For example, a conventional single-stage compressor 11 refrigeration cycle system, compression The pressure of the refrigerant inhaled by the suction port of the compressor 11 is P1, the pressure when the compression stroke reaches the position of the air supply port of the compressor 11 is P2, and the pressure when the compressor 11 stroke ends and is discharged from the compressor 11 is P3, then, the present application provides In the air-conditioning heat pump system, keep P1 unchanged, because the high-temperature and high-pressure refrigerant gas sucked by the air supply port is mixed with the refrigerant gas in half of the internal compression stroke of the compressor 11, and the pressure after mixing is P2'>P2. Therefore, the final The pressure at the end of the compression P3'>P3, thereby realizing the increase of the system pressure ratio, that is, P3'/P1>P3/P1.

The liquid injection pipeline 4 includes a liquid injection valve 41, one end of the liquid injection valve 41 communicates with the suction port of the compressor 11, and the other end communicates with the indoor heat exchanger 13 and the throttling device 14 The communication pipeline between them is connected, and part of the refrigerant liquid condensed by the indoor heat exchanger 13 enters the suction port of the compressor 11 through the liquid injection valve 41 .

The enthalpy-increasing pipeline 2 includes an enthalpy-increasing valve 21, an economizer 22, and an enthalpy-increasing throttle valve 23. The economizer 22 includes a first heat exchange pipeline 24 and a second heat exchange pipeline 25. The enthalpy increase One end of the valve 21 communicates with the air supply port of the compressor 11 , the other end communicates with one end of the second heat exchange pipeline 25 , and one end of the first heat exchange pipeline 24 communicates with the indoor heat exchanger 13 , the other end communicates with the throttling device 14, one end of the enthalpy-increasing throttle valve 23 communicates with the communication pipeline between the indoor heat exchanger 13 and the first heat exchange pipeline 24, and the other end It communicates with the end of the second heat exchange pipeline 25 far away from the enthalpy increasing valve 21 , the air supplement pipeline 3 includes an air supplement valve 31 , and one end of the air supplement valve 31 is connected to the supplementary air supply of the compressor 11 The air port is connected, and the other end is connected with the exhaust port of the compressor 11. The liquid injection pipeline 4 includes a liquid injection valve 41, and one end of the liquid injection valve 41 is connected with the suction port of the compressor 11. The other end communicates with the communication pipeline between the indoor heat exchanger 13 and the throttling device 14 .

The enthalpy increasing valve 21, the air supplement valve 31 and the liquid injection valve 41 are electronic expansion valves or electromagnetic valves or other structures capable of regulating flow, preferably electronic expansion valves, so as to realize pressure and/or flow adjustment .

The enthalpy-increasing throttle valve 23 is an electronic expansion valve to achieve throttling and pressure reduction and flow regulation.

The suction port of the compressor 11 is provided with a first pressure sensor for detecting the suction pressure of the compressor 11, and the air supply port of the compressor 11 is provided with a second pressure sensor for detecting the supplementary pressure of the air-conditioning heat pump system. Gas pressure, the discharge port of the compressor 11 is provided with a third pressure sensor (for detecting the discharge pressure of the compressor 11) and a discharge temperature sensor (for detecting the discharge temperature of the compressor 11), the The outdoor heat exchanger 15 is provided with an outdoor ambient temperature sensor for detecting the outdoor ambient temperature.

A control method for the above-mentioned air-conditioning heat pump system, characterized in that it includes:

In normal mode, the enthalpy-increasing throttle valve 23, the air supplement valve 31, and the liquid injection valve 41 are closed, and the high-temperature and high-pressure refrigerant gas discharged from the compressor 11 enters the four-way valve 12 through the oil separator, and flows through the The indoor heat exchanger 13 condenses and releases heat to become a medium-temperature and medium-pressure refrigerant liquid, and then passes through the throttling part to become a low-temperature and low-pressure refrigerant liquid, enters the outdoor heat exchanger 15 to evaporate and absorb heat, and becomes a low-temperature and low-pressure refrigerant gas. Enter the suction port of the compressor 11 through the four-way valve 12, and the compressor 11 compresses the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and then discharges it;

Enthalpy increase mode, the enthalpy increase throttle valve 23 and the enthalpy increase valve 21 are opened, the air supplement valve 31 and the liquid injection valve 41 are closed, and the medium temperature and medium pressure refrigeration after condensation in the indoor heat exchanger 13 The agent liquid is divided into two parts, one part enters the first heat exchange pipeline 24 to be further cooled, and the other part enters the second heat exchange pipeline 25 after throttling and depressurizing by the enthalpy-increasing throttle valve 23. The temperature is lower than the temperature of the refrigerant liquid in the first heat exchange pipeline 24, and heat exchange occurs with it, and the refrigerant gas absorbs the heat and evaporates into a low-temperature and low-pressure refrigerant gas, which flows out from the second heat exchange pipeline 25 and enters the compressed air through the enthalpy increasing valve 21. The gas supply port of the compressor 11 is mixed with the compressed refrigerant gas inside the compressor 11 and continues to be compressed;

In high pressure ratio mode, the enthalpy-increasing throttle valve 23 is closed, the air supply valve 31 and the liquid injection valve 41 are opened, and part of the high-temperature and high-pressure refrigerant gas discharged from the compressor 11 enters the compressor through the air supply valve 31. The gas supply port of the machine 11 is mixed with the compressed refrigerant gas inside the compressor 11, and then discharged from the exhaust port of the compressor 11 after being compressed. This is the gas supply cycle; part of the refrigerant liquid condensed by the indoor heat exchanger , through the liquid injection valve 41, into the air inlet of the compressor 11, which is the liquid injection cycle.

The control method also includes:

Detect target ambient temperature T1, T2 (T1>T2) and outdoor ambient temperature t1;

If T1≤t1, the air-conditioning heat pump system enters the normal mode;

If T2<t1<T1, the air-conditioning heat pump system enters the enthalpy increasing mode;

If t1≤T2, the air-conditioning heat pump system enters the high pressure ratio mode.

The control method also includes in the high pressure ratio mode:

Detect the suction pressure p1 and the discharge pressure p2 of the compressor 11, and calculate the air supply pressure P=f(p1, p2);

The opening degree of the supplementary gas valve 31 is adjusted according to the supplementary gas pressure P, and the adjustment of the opening degree is used to adjust the current supplementary gas pressure to meet the target intermediate supplementary gas pressure P.

The control method also includes in the high pressure ratio mode:

Set the target exhaust temperature range {Tmin, Tmax};

Detect the exhaust gas temperature t2, and adjust the opening of the liquid injection valve 41, so that t2 is within the range of {Tmin, Tmax}.

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (8)

1. An air-conditioning heat pump system, characterized in that: it includes a heat exchange circulation pipeline (1), an air supply pipeline (3) and a liquid injection pipeline (4), and the heat exchange circulation pipeline (1) includes a compressor (11), an indoor heat exchanger (13), a throttling device (14) and an outdoor heat exchanger (15), one end of the air supply pipeline (3) communicates with the air supply port of the compressor (11), and the other One end communicates with the exhaust port of the compressor (11), and one end of the liquid injection pipeline (4) communicates with the communication pipe between the indoor heat exchanger (13) and the throttling device (14). The other end communicates with the suction port of the compressor (11). 2. The air-conditioning heat pump system according to claim 1, characterized in that: the air-conditioning heat pump system further comprises an enthalpy increasing pipeline (2), and one end of the enthalpy increasing pipeline (2) is connected to the compressor (11) The air supply port is communicated with the other end, and the other end is communicated with the communication pipeline between the indoor heat exchanger (13) and the throttling device (14). 3. The air-conditioning heat pump system according to claim 2, characterized in that: the enthalpy-increasing pipeline (2) includes an enthalpy-increasing valve (21), an economizer (22) and an enthalpy-increasing throttle valve (23), so that The economizer (22) includes a first heat exchange pipeline (24) and a second heat exchange pipeline (25), and one end of the enthalpy increasing valve (21) communicates with the gas supply port of the compressor (11), The other end communicates with one end of the second heat exchange pipeline (25), one end of the first heat exchange pipeline (24) communicates with the indoor heat exchanger (13), and the other end communicates with the throttling device (14) communication, one end of the enthalpy increasing throttle valve (23) is in communication with the communication pipeline between the indoor heat exchanger (13) and the first heat exchange pipeline (24), and the other end is in communication with the The end of the second heat exchange pipeline (25) away from the enthalpy increasing valve (21) is communicated with. 4. The air-conditioning heat pump system according to claim 1, characterized in that: the air supply pipeline (3) includes an air supply valve (31), and one end of the air supply valve (31) is connected to the compressor (11 ) is communicated with the gas supply port, and the other end is communicated with the exhaust port of the compressor (11). 5. The air-conditioning heat pump system according to claim 1, characterized in that: the liquid injection pipeline (4) includes a liquid injection valve (41), and one end of the liquid injection valve (41) is connected to the compressor ( 11) is communicated with the suction port, and the other end is communicated with the communication pipeline between the indoor heat exchanger (13) and the throttling device (14). 6. The air-conditioning heat pump system according to claim 2, characterized in that: the enthalpy increasing pipeline (2) comprises an enthalpy increasing valve (21), an economizer (22) and an enthalpy increasing throttle valve (23), the The economizer (22) includes a first heat exchange pipeline (24) and a second heat exchange pipeline (25), and one end of the enthalpy increasing valve (21) communicates with the gas supply port of the compressor (11), The other end communicates with one end of the second heat exchange pipeline (25), and the first heat exchange pipeline (24) is connected in series between the indoor heat exchanger (13) and the throttling device (14). During the period, one end of the enthalpy-increasing throttle valve (23) communicates with the communication pipeline between the indoor heat exchanger (13) and the first heat exchange pipeline (24), and the other end communicates with the second heat exchange pipeline (24). One end of the heat exchange pipeline (25) away from the enthalpy increasing valve (21) communicates, the gas supply pipeline (3) includes a gas supply valve (31), and one end of the gas supply valve (31) is connected to the The air supply port of the compressor (11) is communicated, and the other end is communicated with the exhaust port of the compressor (11), and the liquid injection pipeline (4) includes a liquid injection valve (41), and the liquid injection valve (41 ) is in communication with the suction port of the compressor (11), and the other end is in communication with the communication pipeline between the indoor heat exchanger (13) and the throttling device (14). 7. The air-conditioning heat pump system according to claim 6, characterized in that: the enthalpy increasing valve (21), the air supply valve (31) and the liquid injection valve (41) are electronic expansion valves or solenoid valves ; The enthalpy-increasing throttle valve (23) is an electronic expansion valve. 8. The air-conditioning heat pump system according to claim 6, characterized in that: the suction port of the compressor (11) is provided with a first pressure sensor, and the air supply port of the compressor (11) is provided with a second pressure sensor sensor, the exhaust port of the compressor (11) is provided with a third pressure sensor and an exhaust temperature sensor, and the outdoor heat exchanger (15) is provided with an outdoor environment temperature sensor.