Compressor and air conditioning system with parallel independent pumps

Abstract

The present invention discloses a compressor with parallel independent pump bodies and an air conditioning system. The compressor with parallel independent pump bodies comprises: a housing, a first cylinder and a second cylinder arranged in the housing, and a parallel cylinder for independent compression and air replenishment is also arranged in the housing. The air intake end of the parallel cylinder is connected in series with a parallel switch valve that controls whether it is running. The air intake ends of the first cylinder, the second cylinder and the parallel cylinder are each independently connected to a liquid distributor, and the parallel switch valve is arranged on the air intake pipe of the liquid distributor connected to the parallel cylinder. The air conditioning system is a double suction single row mode or a double suction double row mode. The double suction single row mode dehumidifies through the low temperature evaporator in the double evaporator and sensible heat is generated by the high temperature evaporator. The double suction double row mode guides the gas discharged from the compressor and the second cylinder to the double condenser, and then merges into the same channel to enter the double evaporator for circulation. The present invention effectively reduces the loss energy consumption of the compressor and improves the energy efficiency of the air conditioning system where the compressor is located.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a compressor with parallel independent pump bodies and an air conditioning system. Background Art

[0002] Three-cylinder compressors are a more common type of multi-cylinder compressors. Existing three-cylinder compressors adopt a one-cylinder variable capacity and two-stage enthalpy increase structure. For example, the utility model patent with announcement number CN208651158U consists of two two-stage two-cylinders plus a variable capacity cylinder. It can be understood as a two-cylinder structure connected in series with a smaller variable capacity cylinder. Its two-cylinder and two-stage are cylinders of equal size, similar to conventional two-cylinder two-stage compressors, and have enthalpy increase function (the air replenishment method of conventional two-stage enthalpy increase compressors is to open an air replenishment port through a partition or flange, and to achieve the effect of air replenishment and enthalpy increase by mixing gas into the cylinder). By adjusting the pressure at the variable capacity control port of the variable capacity cylinder, the variable capacity cylinder can be started and stopped, thereby realizing the switching of two cylinders and three cylinders to complete the function of the compressor.

[0003] The cylinder structure of the existing three-cylinder compressor is complex, resulting in high compressor cost and serious vibration problems. The variable-volume cylinder cannot be switched on and off flexibly. When operating at low temperature and low frequency, the low-load performance advantage is not great, resulting in insufficient APF (intermediate cooling) and poor heating performance. In addition, when the air-conditioning system where the three-cylinder compressor is located is in operation, its cooling and dehumidification are completed in one system, resulting in low heat exchange efficiency of the evaporator, making the air-conditioning system unable to meet the cooling, dehumidification and heating needs of the area north of the Yangtze River Basin, which poses serious hidden dangers to its energy efficiency and after-sales experience.

[0004] Therefore, how to design a compressor and air-conditioning system with parallel independent pump bodies is a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0005] In order to solve the defect of poor performance of existing multi-cylinder compressors, the present invention proposes a compressor with parallel independent pump bodies and an air conditioning system.

[0006] The technical solution adopted by the present invention is to design a compressor with parallel independent pump bodies, including: a housing, a first cylinder and a second cylinder arranged in the housing, and a parallel cylinder for independent compression and air replenishment is also arranged in the housing, and a parallel switch valve for controlling whether the parallel cylinder is running is connected in series to the air intake end of the parallel cylinder. The air intake ends of the first cylinder, the second cylinder and the parallel cylinder are each independently connected to a liquid distributor, and the parallel switch valve is arranged on the air inlet pipe of the liquid distributor connected to the parallel cylinder.

[0007] Preferably, the liquid distributor connected to the first cylinder is the first liquid distributor, and the liquid distributor connected to the second cylinder is the second liquid distributor. An intermediate tube is connected between the air inlet pipe of the first liquid distributor and the air inlet pipe of the second liquid distributor, and the intermediate tube is provided with a control switch valve.

[0008] Preferably, the first cylinder, the second cylinder and the parallel cylinder are arranged in sequence from top to bottom in the housing.

[0009] Preferably, the shell is provided with an exhaust port, and the exhaust ends of the first cylinder, the second cylinder and the parallel cylinder are all connected to the exhaust port.

[0010] Preferably, the shell is provided with an exhaust port, the exhaust ends of the first cylinder and the parallel cylinder are both connected to the exhaust port, and the exhaust end of the second cylinder is separately connected to an exhaust pipe extending out of the shell.

[0011] Preferably, the cylinder volume of the first cylinder is V1, the cylinder volume of the second cylinder is V2, The range is 0.6~1.0.

[0012] Preferably, the cylinder volume of the first cylinder is V1, the cylinder volume of the second cylinder is V2, and the cylinder volume of the parallel cylinder is V3. The range is 0.1~0.4.

[0013] Preferably, the cylinder volume of the first cylinder is V1, the cylinder volume of the second cylinder is V2, and the cylinder volume of the parallel cylinder is V3. The range is 0.105~0.625.

[0014] Preferably, a variable volume cylinder for supplying air to the parallel cylinder is provided in the housing, the variable volume cylinder is connected with the parallel cylinder through an intermediate flow channel, and the intermediate flow channel is unidirectionally conducted through a non-return device.

[0015] The present invention also provides an air conditioning system, which comprises the above-mentioned compressor.

[0016] In one embodiment, the air conditioning system also includes: a condenser, a flash evaporator with three interfaces, a first evaporator, a second evaporator and a four-way valve with four ports; the exhaust port of the compressor is connected to the first port of the four-way valve; one end of the condenser is connected to the second port of the four-way valve, and the other end is connected to the first interface of the flash evaporator; one end of the first evaporator is connected to the second interface of the flash evaporator, and the other end is connected to the third port of the four-way valve; one end of the second evaporator is connected to the second interface of the flash evaporator, and the other end is provided with a first branch and a second branch in parallel, the first branch is connected in series with the first switch valve and connected to the intake pipe of the liquid distributor connected to the first cylinder, and the second branch is connected in series with the second switch valve and connected to the exhaust port of the compressor; the fourth port of the four-way valve is connected to the intake pipe of the liquid distributor connected to the second cylinder, and the third interface of the flash evaporator is connected to the intake pipe of the liquid distributor connected to the parallel cylinder.

[0017] In another embodiment, the air-conditioning system further comprises: a first condenser, a second condenser, a flash evaporator having three interfaces, a first evaporator, a second evaporator and a four-way valve having four ports; the exhaust port of the compressor is connected to the first end of the four-way valve; one end of the first condenser is connected to the exhaust end of the second cylinder, and the other end is connected to the first interface of the flash evaporator; one end of the second condenser is connected to the second port of the four-way valve, and the other end is connected to the first interface of the flash evaporator; one end of the first evaporator is connected to the second interface of the flash evaporator, and the other end is connected to the third port of the four-way valve; one end of the second evaporator is connected to the second interface of the flash evaporator, and the other end is connected to the first branch and the second branch are arranged in parallel, the first branch is connected in series with the first switch valve and connected to the air inlet pipe of the liquid distributor connected to the first cylinder, and the second branch is connected in series with the second switch valve and connected to the exhaust port of the compressor; the fourth port of the four-way valve is connected to the air inlet pipe of the liquid distributor connected to the second cylinder, and the third interface of the flash evaporator is connected to the air inlet pipe of the liquid distributor connected to the parallel cylinder.

[0018] Compared with the prior art, the present invention retains the dual-cylinder structure with two-stage enthalpy increase in the conventional three-cylinder compressor, and further arranges a parallel cylinder in the compressor. The parallel cylinder compresses and replenishes air separately, and the operation or unloading of the parallel cylinder is controlled by a parallel switching valve. The working state of the compressor can be flexibly adjusted as needed, effectively reducing the loss and energy consumption of the compressor, improving the large vibration of the compressor, and improving the energy efficiency of the air-conditioning system where the compressor is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0020] Figure 1 It is a schematic diagram of the internal structure of the compressor in the present invention;

[0021] Figure 2 It is a schematic diagram of the refrigeration refrigerant flow direction of the double-suction single-row air-conditioning system of the present invention;

[0022] Figure 3 Schematic diagram of the dehumidification refrigerant flow direction of the double-suction single-row air conditioning system of the present invention;

[0023] Figure 4 It is a schematic diagram of the refrigeration refrigerant flow direction of the double-suction double-row air-conditioning system in the present invention. DETAILED DESCRIPTION

[0024] like Figures 1 to 4As shown, the compressor proposed by the present invention includes: a shell, a first cylinder 1 and a second cylinder 2 arranged in the shell, and a parallel cylinder 3 for independent compression and air replenishment is also arranged in the shell. The independent compression and air replenishment here means that the parallel cylinder 3 has an independent working chamber and exhaust end, and the suction compression and exhaust of the working chamber are not affected by the first cylinder 1 and the second cylinder 2. The gas discharged from the parallel cylinder 3 enters the shell to play a role of air replenishment. The suction end of the parallel cylinder 3 is connected in series with a parallel switch valve 4 that controls whether it is running. When the parallel switch valve 4 is opened, the parallel cylinder 3 works independently, and the gas discharged from its working chamber is sent into the shell to mix with the gas discharged from the first cylinder 1 and the second cylinder 2; when the parallel switch valve 4 is closed, the parallel cylinder 3 is unloaded and does not participate in the refrigerant cycle. The switch of the parallel switch valve 4 can be adjusted according to actual needs, and it is flexible to use and easy to control.

[0025] Specifically, the suction ends of the first cylinder 1, the second cylinder 2 and the parallel cylinder 3 are each independently connected to a liquid distributor, the liquid distributor connected to the first cylinder 1 is the first liquid distributor 5, the liquid distributor connected to the second cylinder 2 is the second liquid distributor 6, the liquid distributor connected to the suction end of the parallel cylinder 3 is the parallel liquid distributor 7, the parallel switch valve 4 is arranged on the intake pipe of the parallel liquid distributor 7, an intermediate pipe is connected between the intake pipe of the first liquid distributor 5 and the intake pipe of the second liquid distributor 6, the intermediate pipe is provided with a control switch valve 8, when the control switch valve 8 is closed, the first cylinder 1 and the second cylinder 2 are respectively compressed and replenished with gas, when the control switch valve 8 is turned on, the first cylinder 1 and the second cylinder 2 inhale gas with the same evaporation temperature for compression.

[0026] In a preferred embodiment, the first cylinder 1, the second cylinder 2 and the parallel cylinder 3 are arranged in sequence from top to bottom in the housing, the first cylinder 1 is a high-pressure cylinder, the second cylinder 2 is a low-pressure cylinder, the cylinder volumes of the first cylinder 1, the second cylinder 2 and the parallel cylinder 3 are all different, the cylinder volume of the first cylinder 1 is V1, the cylinder volume of the second cylinder 2 is V2, and the cylinder volume of the parallel cylinder 3 is V3. The range is 0.6~1.0, The range is 0.1~0.4. When the ratio is between 0.105 and 0.625, the compressor has the optimal volume ratio, and the gas injection pressure of parallel cylinder 3 reaches the optimal pressure value. Through theoretical calculation of the volume ratio of the three cylinders, it can be confirmed that the optimal volume ratio makes the heating performance of the compressor reach the best, which can improve the compressor energy efficiency by about 20% in cooling conditions, and can also effectively improve the heating performance of -15℃ in dehumidification and heating conditions, maximize the efficiency of mechanical refrigeration, and effectively solve problems such as vibration while improving the compressor energy efficiency.

[0027] There are two ways to set the second cylinder 2, such as Figure 2 , 4As shown, the first method is that the shell is provided with an exhaust port, and the exhaust ends of the first cylinder 1, the second cylinder 2 and the parallel cylinder 3 are all connected to the exhaust port, and the gases exhausted from the first cylinder 1, the second cylinder 2 and the parallel cylinder 3 are mixed in the shell. The first method is suitable for the double-suction single-discharge mode of the following air-conditioning system; Figure 4 As shown, the second type is that the shell is provided with an exhaust port, the exhaust ends of the first cylinder 1 and the parallel cylinder 3 are connected to the exhaust port, the gases exhausted from the first cylinder 1 and the parallel cylinder 3 are mixed in the shell, and the exhaust end of the second cylinder 2 is separately connected to an exhaust pipe extending out of the shell, and the exhausted gas is directly sent to the heat exchanger outside the compressor. In the second setting method, the exhaust end of the second cylinder 2 is connected to an exhaust liquid separator 9, and the refrigerant sent from the exhaust end passes through the exhaust liquid separator 9 and then enters the heat exchanger outside the compressor. The second method is suitable for the double-suction double-discharge mode of the following air-conditioning system.

[0028] In an optional embodiment, a variable volume cylinder for supplying air to the parallel cylinder 3 is provided in the housing, and the variable volume cylinder is located at the lower layer of the parallel cylinder. The variable volume cylinder is connected to the parallel cylinder 3 through an intermediate flow channel, and the intermediate flow channel is unidirectionally conducted through a non-return device. The specific structure and working principle of the non-return device have been disclosed in detail in the utility model with the authorization announcement number CN208651158U, and will not be repeated here. This optional embodiment is a scheme for realizing variable volume plus two-stage enthalpy increase plus parallel independent compression, which can be switched between two-cylinder, three-cylinder and four-cylinder modes, which can not only expand the operating range of the compressor, but also enable the compressor to operate under a wider range of environmental conditions. Theoretically, it can achieve effective operation in a temperature environment between -45℃ and 40℃.

[0029] The present invention also proposes an air conditioning system, which includes a double evaporator and the above-mentioned compressor. A switch valve is provided in part of the passage of the air conditioning system. The above-mentioned switch valve can be a solenoid valve. By changing the closed state of each switch valve, the gas flow path of the single-row compressor in the air conditioning system pipeline can be changed, so that the air conditioning system inhales gas with different or same evaporation temperatures, and independently compresses in the double-temperature large and small cylinders to improve the refrigeration capacity. After the double evaporation temperature evaporator, the low-temperature evaporator is used for dehumidification, and the high-temperature evaporator is used for processing sensible heat, and the load is processed in stages to improve the circulation efficiency. Not only does it save cost space, but it can also achieve the effect of separating the sensible heat and latent heat of the system while increasing the refrigeration capacity. In addition, a double-suction double-row air conditioning system can also be designed, by diverting the gas of the second cylinder 2 to the double condenser, exhausting the gas through the exhaust port of the shell to the second condenser 20, and the exhaust gas of the second cylinder 2 to the first condenser 19, through the mutual heat exchange of the condenser, finally merged into the same channel to enter the double evaporator for recycling, further improving the refrigeration effect, and effectively improving the APF value of the air conditioning system.

[0030] like Figure 2 , 3As shown, in one embodiment, the air-conditioning system is a double-suction single-row mode. Specifically, the air-conditioning system also includes: a condenser 14, a flash evaporator 10 with three interfaces, a first evaporator 11, a second evaporator 12 and a four-way valve 13 with four ports. The exhaust port of the compressor is connected to the first end of the four-way valve 13, one end of the condenser 14 is connected to the second port of the four-way valve 13, and the other end is connected in series with a first throttle valve 15 to connect the first interface of the flash evaporator 10, one end of the first evaporator 11 is connected to the second interface of the flash evaporator 10, and the other end is connected to the third port of the four-way valve 13, one end of the second evaporator 12 is connected in series with a second throttle valve 16 to connect the second interface of the flash evaporator 10, and the other end is provided with a first branch and a second branch in parallel, the first branch is connected in series with a first switch valve 17 to connect the air inlet pipe of the first liquid distributor 5, the second branch is connected in series with a second switch valve 18 to connect the exhaust port of the compressor, the fourth port of the four-way valve 13 is connected to the air inlet pipe of the second liquid distributor 6, and the third interface of the flash evaporator 10 is connected to the air inlet pipe of the parallel liquid distributor 7.

[0031] Designed for both summer cooling and rainy season dehumidification, when it is hot in summer, the dual evaporators of the air-conditioning system have a low-temperature evaporator for dehumidification and a high-temperature evaporator for processing sensible heat, which can handle loads in stages, improve cycle efficiency, independently control temperature and humidity, and effectively increase cooling capacity; when it is humid in the rainy season, the gas flow path is changed, the low-temperature evaporator is used for reheating, and the high-temperature evaporator is used for condensation and dehumidification, with dual control of temperature and humidity, condensation and reheating, and effectively improving dehumidification capacity, while the medium-pressure gas of the flash evaporator is output to the parallel cylinder 3, and the gas discharged from the parallel cylinder 3 is mixed with the gas in the shell to achieve the effect of replenishing air and increasing enthalpy, which are described in detail below.

[0032] like Figure 2 As shown, summer cooling - double suction single row mode: close the control switch valve 8 and the second switch valve 18, open the first switch valve 17, at this time the gas discharged from the compressor passes through the four-way valve 13 and the condenser 14, and open the first throttle valve 15 and the second throttle valve 16 at the same time, and perform throttling and pressure reduction in turn. Part of the gas passes through the flash evaporator 10 and the first evaporator 11, and part of the gas passes through the second throttle valve 16 and enters the second evaporator 12. Correspondingly, the first evaporator 11 processes the sensible heat to lead the gas to the second cylinder 2, and the second evaporator 12 dehumidifies and leads the gas to the first cylinder 1. The first cylinder 1 and the second cylinder 2 work independently, so that the air conditioning system cools down in stages, and the temperature and humidity are independently controlled, which significantly improves the refrigeration capacity of the air conditioning system and improves the refrigeration effect for the hot summer environment. At the same time, the parallel switch valve 4 can be opened or closed, and whether the parallel cylinder 3 is unloaded is determined according to actual needs. When the parallel cylinder 3 is running, the compressed gas is discharged into the shell cavity and mixed with the gas compressed by the first cylinder 1 and the second cylinder 2, which serves as the effect of replenishing air and increasing enthalpy to improve the energy efficiency of the compressor and the air-conditioning system.

[0033] like Figure 3As shown, the rainy season dehumidification-double suction single row mode: open the control switch valve 8 and the second switch valve 18, close the first switch valve 17, at this time the gas discharged from the compressor passes through the four-way valve 13 and the condenser 14, and the first throttle valve 15 and the second throttle valve 16 are opened at the same time, and the throttling and pressure reduction effects are performed in turn. The gas first passes through the flash evaporator 10 and accumulates at the first evaporator 11. At this time, the gas discharged from the compressor passes through the second evaporator 12 for reheating, and then the gas mixture passes through the first evaporator 11 for condensation and dehumidification, and then passes through the four-way valve 13 again to enter the first cylinder 1 and the second cylinder 2 corresponding to the first and second liquid distributors. Since the first switch valve 17 is closed, at this time, the dual-temperature large and small cylinders inhale gas with the same evaporation temperature, so that the dual-evaporator air-conditioning system has dual temperature and humidity control, temperature adjustment and dehumidification, condensation and reheating, and no electric heating is required, which significantly improves the heating capacity of the air-conditioning system and improves the treatment effect for the rainy season environment. At the same time, the parallel switch valve 4 can be opened or closed, and whether the parallel cylinder 3 is unloaded is determined according to actual needs. When the parallel cylinder 3 is running, the compressed gas is discharged into the shell cavity and mixed with the gas compressed by the first cylinder 1 and the second cylinder 2, which serves as the effect of replenishing air and increasing enthalpy to improve the energy efficiency of the compressor and the air-conditioning system.

[0034] like Figure 4 As shown, in another embodiment, the air conditioning system is a double-suction double-row mode, which differs from the double-suction single-row mode only in the exhaust port flow path design and the addition of a double condenser result. Specifically, the air conditioning system also includes: a first condenser 19, a second condenser 20, a flash evaporator 10 with three interfaces, a first evaporator 11, a second evaporator 12 and a four-way valve 13 with four ports; the exhaust port of the compressor is connected to the first end of the four-way valve 13; one end of the first condenser 19 is connected in series with the first throttle valve 15 to the first interface of the flash evaporator 10, and the other end is connected to the exhaust pipe of the exhaust liquid separator 9; one end of the second condenser 20 is connected in series with the first throttle valve 15 to the exhaust pipe of the exhaust liquid separator 9; The first end of the first evaporator 11 is connected to the second interface of the flash evaporator 10, and the other end is connected to the second port of the four-way valve 13; one end of the first evaporator 11 is connected to the second interface of the flash evaporator 10, and the other end is connected to the third port of the four-way valve 13; one end of the second evaporator 12 is connected in series with the second throttle valve 16 to connect the second interface of the flash evaporator 10, and the other end is provided with a first branch and a second branch in parallel, the first branch is connected in series with the first switch valve 17 to connect the air inlet pipe of the first liquid distributor 5, and the second branch is connected in series with the second switch valve 18 to connect the exhaust port of the compressor; the fourth port of the four-way valve 13 is connected to the air inlet pipe of the second liquid distributor 6, and the third interface of the flash evaporator 10 is connected to the air inlet pipe of the parallel liquid distributor 7.

[0035] like Figure 4As shown, summer cooling-double suction and double discharge mode: close the control switch valve 8 and the second switch valve 18, open the first switch valve 17, at this time, the gas discharged from the compressor passes through the four-way valve 13 and the second condenser 20, the gas discharged from the second cylinder 2 passes through the first condenser 19, and finally converges in the same pipeline through the first throttle valve 15 and the flash evaporator 10, and the first throttle valve 15 and the second throttle valve 16 are opened at the same time. Part of the gas passes through the flash evaporator 10 and the first evaporator 11, and part of the gas passes through the second evaporator 12 through the second throttle valve 16. Correspondingly, the first evaporator 11 processes the sensible heat to lead the gas to the second cylinder 2, and the second evaporator 12 dehumidifies and leads the gas to the first cylinder 1. The first cylinder 1 and the second cylinder 2 independently suck and exhaust, so that the air-conditioning system of the double condenser enhances the heat exchange effect and further improves the condensation and dehumidification effect, and the double evaporator air-conditioning system cools down in stages, and the temperature and humidity are independently controlled, which significantly improves the refrigeration capacity of the air-conditioning system, and significantly improves the refrigeration effect for the hot environment in summer. At the same time, the parallel switch valve 4 can be opened or closed, and whether the parallel cylinder 3 is unloaded is determined according to actual needs. When the parallel cylinder 3 is running, the compressed gas is discharged into the shell cavity and mixed with the gas compressed by the first cylinder 1, which serves as the effect of replenishing air and increasing enthalpy to improve the energy efficiency of the compressor and the air-conditioning system.

[0036] The present invention solves the problems of high cost, large vibration and general promotion effect of conventional three-cylinder compressors, and can also solve the problems of small low-load performance advantage and insufficient APF. The dual evaporation temperature evaporator of the air-conditioning system is combined with the low-temperature evaporator for dehumidification and the high-temperature evaporator for processing sensible heat, and the load is processed in stages to improve the circulation efficiency. The air-conditioning system of the present invention can not only realize summer refrigeration, dual evaporators, step cooling, and independent control of temperature and humidity, but also realize dehumidification in the rainy season, dual control of temperature and humidity, temperature-adjusting dehumidification, condensation reheating, and no need for electric reheating.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: include: A compressor, a condenser, a flash evaporator with three interfaces, a first evaporator, a second evaporator and a four-way valve with four ports; the compressor comprises: a shell, a first cylinder and a second cylinder arranged in the shell, and the shell is also provided with parallel cylinders for independent compression and air replenishment, and the air intake end of the parallel cylinder is connected in series with a parallel switch valve for controlling whether it is running; the first cylinder, the second cylinder and the air intake end of the parallel cylinder are each independently connected to a liquid distributor, and the parallel switch valve is arranged on the air inlet pipe of the liquid distributor connected to the parallel cylinder; The housing is provided with an exhaust port, and the exhaust ends of the first cylinder, the second cylinder and the parallel cylinder are all connected to the exhaust port; The exhaust port of the compressor is connected to the first port of the four-way valve; One end of the condenser is connected to the second port of the four-way valve, and the other end is connected to the first interface of the flash evaporator; one end of the first evaporator is connected to the second interface of the flash evaporator, and the other end is connected to the third port of the four-way valve; one end of the second evaporator is connected to the second interface of the flash evaporator, and the other end is provided with a first branch and a second branch in parallel, the first branch is connected in series with a first switch valve connected to the air inlet pipe of the liquid distributor connected to the first cylinder, and the second branch is connected in series with the second switch valve connected to the exhaust port of the compressor; The fourth port of the four-way valve is connected to the air inlet pipe of the liquid distributor connected to the second cylinder; the third interface of the flash evaporator is connected to the air inlet pipe of the liquid distributor connected to the parallel cylinder.

2. An air conditioning system, characterized in that: include: A compressor, a first condenser, a second condenser, a flash evaporator with three interfaces, a first evaporator, a second evaporator and a four-way valve with four ports; the compressor comprises: a shell, a first cylinder and a second cylinder arranged in the shell, and the shell is also provided with parallel cylinders for independent compression and air replenishment, and the air intake end of the parallel cylinder is connected in series with a parallel switch valve for controlling whether it is running; the first cylinder, the second cylinder and the air intake end of the parallel cylinder are each independently connected to a liquid distributor, and the parallel switch valve is arranged on the air inlet pipe of the liquid distributor connected to the parallel cylinder; The housing is provided with an exhaust port, the exhaust ends of the first cylinder and the parallel cylinder are both connected to the exhaust port, and the exhaust end of the second cylinder is separately connected to an exhaust pipe extending out of the housing; The exhaust port of the compressor is connected to the first port of the four-way valve; one end of the first condenser is connected to the exhaust end of the second cylinder, and the other end is connected to the first interface of the flash evaporator; One end of the second condenser is connected to the second port of the four-way valve, and the other end is connected to the first interface of the flash evaporator; one end of the first evaporator is connected to the second interface of the flash evaporator, and the other end is connected to the third port of the four-way valve; one end of the second evaporator is connected to the second interface of the flash evaporator, and the other end is provided with a first branch and a second branch in parallel, the first branch is connected in series with a first switch valve connected to the air inlet pipe of the liquid distributor connected to the first cylinder, and the second branch is connected in series with the second switch valve connected to the exhaust port of the compressor; The fourth port of the four-way valve is connected to the air inlet pipe of the liquid distributor connected to the second cylinder; the third interface of the flash evaporator is connected to the air inlet pipe of the liquid distributor connected to the parallel cylinder.

3. The air conditioning system according to claim 1 or 2, characterized in that: The liquid distributor connected to the first cylinder is the first liquid distributor, and the liquid distributor connected to the second cylinder is the second liquid distributor. An intermediate pipe is connected between the air inlet pipe of the first liquid distributor and the air inlet pipe of the second liquid distributor, and the intermediate pipe is provided with a control switch valve.

4. The air conditioning system according to claim 1 or 2, characterized in that: The first cylinder, the second cylinder and the parallel cylinder are arranged in sequence from top to bottom in the housing.

5. The air conditioning system according to claim 1 or 2, characterized in that: The cylinder volume of the first cylinder is V1, the cylinder volume of the second cylinder is V2, and the range of V1÷V2 is 0.6~1.

0.

6. The air conditioning system according to claim 1 or 2, characterized in that: The cylinder volume of the first cylinder is V1, the cylinder volume of the second cylinder is V2, the cylinder volume of the parallel cylinder is V3, and the range of V3÷(V1+V2) is 0.1~0.

4.

7. The air conditioning system according to claim 1 or 2, characterized in that: The cylinder volume of the first cylinder is V1, the cylinder volume of the second cylinder is V2, the cylinder volume of the parallel cylinder is V3, and the range of V3÷(V1+V2+V3) is 0.105~0.

625.

8. The air conditioning system according to claim 1 or 2, characterized in that: The housing is provided with a variable volume cylinder for supplying air to the parallel cylinders. The variable volume cylinder is connected to the parallel cylinders through an intermediate flow channel, and the intermediate flow channel is unidirectionally conducted through a non-return device.

Images