Screw compressor and air conditioning system

Abstract

The utility model discloses a screw compressor and an air conditioning system. The screw compressor comprises a slide valve; the piston cylinder transmission mechanism is connected with the slide valve and is used for driving the slide valve to act; the piston cylinder transmission mechanism comprises a piston cavity and a piston located in the piston cavity, the piston is connected with the sliding valve through a piston rod, one path of a side cavity, opposite to the piston rod, of the piston cavity is connected with the high-pressure side of the compressor through an oil inlet pipe, and the other path is connected with the low-pressure side of the compressor through a pressure adjusting pipe. And a pressure regulating electromagnetic valve is arranged on the pressure regulating pipe. According to the screw compressor disclosed by the utility model, the pressure regulating pipe is arranged, and the pressure regulating electromagnetic valve is arranged on the pressure regulating pipe, so that when the pressure between the oil inlet pipe and the piston cavity exceeds a certain limit value, a part of hydraulic oil can be unloaded through the pressure regulating pipe by opening the pressure regulating electromagnetic valve, and the pressure between the oil inlet pipe and the piston cavity is maintained to be controlled within a certain range; therefore, the conduction amount of the hydraulic oil is controlled within a certain range, and the situation that the loading amount is too large due to too large pressure difference is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of compressor technology, specifically, it relates to a screw compressor and an air conditioning system. Background Technology

[0002] Screw compressors typically use a slide valve or plunger structure located inside the unit to adjust the compressor's suction capacity. That is, the capacity change is achieved by moving the slide valve to a set position. Structures using slide valves to adjust capacity generally utilize the pressure difference within the compressor as the power source for the slide valve's movement.

[0003] Under different operating conditions, both the discharge and suction pressures will vary. Due to the different pressure differences, the flow rate through the connecting pipe will also differ. Therefore, during the adjustment process, the amount of oil flowing from the oil tank through the connecting pipe to the piston cylinder will vary within the loading period, resulting in different piston movement distances and correspondingly different increases in the discharge volume of refrigerant gas, leading to variations in the cooling capacity. Especially under high pressure ratio (the ratio of compressor discharge pressure to suction pressure) conditions, the amount of oil entering the cylinder per unit loading time will increase significantly, resulting in large fluctuations in cooling capacity and causing significant variations in the unit's output capacity. Summary of the Invention

[0004] This invention addresses the technical problem of unstable capacity regulation and fluctuating output capacity in existing screw compressors due to variations in the pressure difference between intake and exhaust pressures during adjustment, which leads to different piston movement distances. A new screw compressor is proposed to solve this problem.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0006] A screw compressor, comprising:

[0007] slide valve;

[0008] A piston cylinder transmission mechanism, which is connected to the slide valve, is used to drive the slide valve to move;

[0009] The piston cylinder transmission mechanism includes a piston chamber and a piston located in the piston chamber. The piston is connected to the slide valve through a piston rod. One of the chambers on the side opposite to the piston rod is connected to the high-pressure side of the compressor through an oil inlet pipe, and the other is connected to the low-pressure side of the compressor through a pressure regulating pipe.

[0010] A pressure regulating solenoid valve is installed on the pressure regulating pipe.

[0011] In some embodiments, an oil inlet solenoid valve is provided on the oil inlet pipe, and the screw compressor further includes:

[0012] A pressure switch is used to detect the oil pressure of the hydraulic oil entering the piston chamber through the oil inlet pipe and send it to the control module. The control module controls the opening and closing state of the pressure regulating solenoid valve according to the oil pressure.

[0013] In some embodiments, the screw compressor further includes:

[0014] The unloading pipe further includes a cavity on the side opposite to the piston rod of the piston chamber, which is connected to the low-pressure side of the compressor via the unloading pipe.

[0015] An unloading solenoid valve is installed on the unloading pipe. When the unloading solenoid valve is opened, the hydraulic oil in the piston chamber is discharged through the unloading pipe.

[0016] In some embodiments, the piston cylinder transmission mechanism further includes a piston reset mechanism, which is disposed in the piston chamber and is used to drive the piston to reset.

[0017] In some embodiments, the piston reset mechanism is a reset spring, which is disposed in the piston cavity and located on the same side as the piston rod. When the oil inlet solenoid valve is opened, hydraulic oil enters the piston cavity through the oil inlet pipe, driving the piston to compress the reset spring. When the oil inlet solenoid valve is closed and the unloading solenoid valve is opened, the reset spring resets, pushing the piston to discharge the hydraulic oil through the unloading pipe.

[0018] In some embodiments, the pressure switch is located near the piston chamber on the oil inlet pipe.

[0019] In some embodiments, the screw compressor further includes a rotor chamber, in which a rotor is disposed. The rotor chamber has a valve port communicating with the low-pressure side of the compressor. A slide valve is disposed on one side of the valve port, and the piston cylinder transmission mechanism is used to drive the slide valve to adjust the opening degree of the valve port.

[0020] In some embodiments, one end of the rotor cavity is connected to the low-pressure side of the compressor, and the other end is connected to the high-pressure side of the compressor.

[0021] In some embodiments, the screw compressor further includes an oil sump, and the oil inlet pipe is connected to the oil sump.

[0022] This utility model also proposes an air conditioning system, which includes the screw compressor described in any of the foregoing claims.

[0023] Compared with the prior art, the advantages and positive effects of this utility model are:

[0024] This invention relates to a screw compressor. By setting a pressure regulating pipe, the piston chamber has a connection to the low-pressure side of the compressor via the pressure regulating pipe, and a pressure regulating solenoid valve is installed on the pressure regulating pipe. When the compressor is under load, if the pressure between the oil inlet pipe and the piston chamber exceeds a certain limit, the pressure regulating solenoid valve is opened, and a portion of the hydraulic oil can be unloaded through the pressure regulating pipe to maintain the pressure between the oil inlet pipe and the piston chamber within a certain range. This ensures that the hydraulic oil flow is controlled within a certain range, preventing excessive load due to excessive pressure difference, and effectively maintaining the smoothness of compressor loading.

[0025] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a system schematic diagram of one embodiment of the screw compressor proposed in this utility model;

[0028] Figure 2 yes Figure 1 A schematic diagram of one embodiment of the piston cylinder transmission mechanism 12;

[0029] Figure 3 This is a schematic diagram of the compressor at its minimum load state in one embodiment of the screw compressor proposed in this utility model;

[0030] Figure 4 This is a schematic diagram of the compressor in the loading state in one embodiment of the screw compressor proposed in this utility model;

[0031] Figure 5 This is a schematic diagram of the compressor in a 100% loaded state in one embodiment of the screw compressor proposed in this utility model;

[0032] Figure 6 This is a schematic diagram of the compressor pressure regulation state in one embodiment of the screw compressor proposed in this utility model;

[0033] Figure 7 This is a schematic diagram of the compressor in the unloading state in one embodiment of the screw compressor proposed in this utility model;

[0034] Figure 8This is a schematic diagram of the compressor in a stable state in one embodiment of the screw compressor proposed in this utility model;

[0035] Figure 9 This is a system schematic diagram of another embodiment of the screw compressor proposed in this utility model;

[0036] Figure 10 yes Figure 9 A schematic diagram of a screw compressor under minimum load conditions;

[0037] In the diagram: 11. Spool valve; 12. Piston rod transmission mechanism; 121. Piston chamber; 122. Piston; 123. Piston rod; 124. Return spring; 13. Oil inlet pipe; 14. Pressure regulating pipe; 15. Pressure regulating solenoid valve; 16. Oil inlet solenoid valve; 17. Pressure switch; 18. Unloading pipe; 19. Unloading solenoid valve; 20. Rotor chamber; 201. Valve port; 21. Rotor; 22. Oil tank; 23. Reset pipe; 24. Reset solenoid valve. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] In some embodiments, a screw compressor is proposed, such as... Figure 1 As shown, it includes: a slide valve 11 and a piston cylinder transmission mechanism 12. The piston cylinder transmission mechanism 12 is connected to the slide valve 11 and is used to drive the slide valve 11 to move. When the slide valve 11 moves, it can cooperate to adjust the suction capacity of the compressor.

[0042] In some embodiments, such as Figure 2 As shown, the piston cylinder transmission mechanism 12 includes a piston chamber 121 and a piston 122 located in the piston chamber 121. The piston 122 divides the piston chamber 121 into two parts, and the piston 122 is connected to the slide valve 11 via a piston rod 123. It is understood that the slide valve 11 is located outside the piston chamber 121, and one end of the piston rod 123 extends outside the piston chamber 121 and connects to the slide valve 11. One path of the side chamber of the piston chamber 121 opposite to the piston rod 123 is connected to the high-pressure side of the compressor via an oil inlet pipe 13, and the other path is connected to the low-pressure side of the compressor via a pressure regulating pipe 14.

[0043] Screw compressors typically use a slide valve or plunger structure located inside the unit to adjust the compressor's suction capacity. That is, the compressor capacity is changed by moving the slide valve to a set position. In the piston cylinder drive mechanism 12, the piston 122 and the slide valve 11 are connected by a piston rod 123, forming a moving part. The pressure difference between the compressor's internal oil supply system and the gaseous refrigerant pressure drives the piston 122, which in turn causes the slide valve 11 to slide left and right, thereby controlling and adjusting the compressor's suction capacity.

[0044] like Figure 3 The diagram shown is a schematic of the compressor under minimum load conditions. Figure 4The diagram shows the compressor under load. During loading, one path of the side chamber of piston chamber 121 opposite to piston rod 123 is connected to the high-pressure side of the compressor via oil inlet pipe 13. The other path is connected to the low-pressure side of the compressor via pressure regulating pipe 14. When hydraulic oil enters the side chamber of piston chamber 121 opposite to piston rod 123 from the high-pressure side of the compressor via oil inlet pipe 13, the pressure in that side chamber increases, pushing piston 122 to the right. This, in turn, drives slide valve 11 to the right via piston rod 123. At this time, the effective compression volume in the compression chamber increases, meaning the refrigerant gas discharge volume increases, and the corresponding cooling capacity also increases. Figure 5 The diagram shown is a schematic of the compressor at 100% load.

[0045] In some embodiments, a pressure regulating solenoid valve 15 is provided on the pressure regulating pipe 14. When the pressure regulating solenoid valve 15 is open, the pressure regulating pipe 14 is open to connect the piston chamber 121 with the low-pressure side of the compressor. When the pressure regulating solenoid valve 15 is closed, the pressure regulating pipe 14 is disconnected, and the piston chamber 121 is not connected to the low-pressure side of the compressor.

[0046] The screw compressor in this embodiment is equipped with a pressure regulating pipe 14. The piston chamber 121 has a connection to the low-pressure side of the compressor via the pressure regulating pipe 14, and a pressure regulating solenoid valve 15 is installed on the pressure regulating pipe 14. When the compressor is under load, if the pressure between the oil inlet pipe 13 and the piston chamber 121 exceeds a certain limit, the pressure regulating solenoid valve 15 is opened, allowing a portion of the hydraulic oil to be unloaded through the pressure regulating pipe 14. This maintains the pressure between the oil inlet pipe 13 and the piston chamber 121 within a certain range, ensuring that the hydraulic oil flow is controlled within a certain range. This prevents excessive load due to excessive pressure difference, thus maintaining the smoothness of compressor loading. Figure 6 The diagram shown is a schematic of the compressor pressure regulation state.

[0047] The pressure between the oil inlet pipe 13 and the piston chamber 121 can be calculated using other known parameters, or it can be detected using a pressure detection device.

[0048] In some embodiments, the screw compressor further includes a control module, and the pressure regulating solenoid valve 15 is connected to the control module, and the on / off state of the pressure regulating solenoid valve 15 is controlled by the control module.

[0049] In some embodiments, an oil inlet solenoid valve 16 is provided on the oil inlet pipe 13, and the screw compressor also includes a pressure switch 17. The pressure switch 17 is used to detect the oil pressure of the hydraulic oil entering the piston chamber 121 through the oil inlet pipe and send it to the control module. The control module controls the opening and closing state of the pressure regulating solenoid valve according to the oil pressure.

[0050] Under a certain pressure, the flow rate of the oil flowing through the oil inlet pipe 13 to the piston chamber 121 is consistent, which means that the loading rate is stable.

[0051] Pressure switch 17 has normally open and normally closed contacts, and pressure values ​​P1 and P2 can be set, where P1 > P2. When the measured pressure P ≥ P1, the normally closed contact of pressure switch 17 opens and the normally open contact closes. When the measured pressure P ≤ P2, the normally closed contact of pressure switch 17 closes and the normally open contact opens.

[0052] During operation, when the compressor has a loading requirement, the pressure regulating solenoid valve 15 closes and the oil inlet solenoid valve 16 opens. In this way, the oil flowing from the compressor oil sump through the oil inlet pipe passes through the oil inlet solenoid valve 16 and flows into the piston chamber 121. Under the action of oil pressure, the piston 122 moves to the right and drives the regulating slide valve 11 to move to the right through the piston rod 123. At this time, the effective compression volume in the compression chamber increases, which means that the discharge volume of refrigerant gas increases, and the corresponding cooling capacity also increases.

[0053] When the pressure value P of the oil flowing through the connecting pipe is greater than or equal to P1, the normally closed contact of pressure switch 17 opens and the normally open contact closes. Simultaneously, the pressure regulating solenoid valve 15 connected to the normally closed contact is energized and connected. The oil flowing through the connecting pipe is bypassed through the pressure regulating solenoid valve 15. As the bypass volume gradually increases, the amount of oil flowing through the connecting pipe to the piston chamber 121 gradually decreases, and the pressure inside the pipe also gradually decreases. When the pressure value P measured by pressure switch 17 is less than or equal to P2, the normally closed contact of pressure switch 17 closes and the normally open contact opens. The pressure regulating solenoid valve 15 connected to the normally closed contact is de-energized and disconnects, causing the oil bypass flow path to be cut off. All the oil then flows back into the piston chamber 121. As the oil flow rate increases, the oil pressure inside the pipe gradually rises. Through the repeated actions of pressure switch 17 and pressure regulating solenoid valve 15, the pressure of the oil in the flow pipe is controlled within a certain range, thereby ensuring that the oil flow rate is controlled within a certain range. This prevents excessive loading due to excessive pressure difference and maintains smooth loading.

[0054] In some embodiments, the screw compressor also includes an unloading pipe 18 and an unloading solenoid valve 19, and the side chamber of piston chamber 121 opposite to piston rod 123 also includes a path connected to the low-pressure side of the compressor through the unloading pipe 18.

[0055] The unloading solenoid valve 19 is installed on the unloading pipe 18. When the unloading solenoid valve 19 is opened, the hydraulic oil in the piston chamber can be discharged through the unloading pipe. Figure 7 The diagram shown is a schematic of the compressor unloading state.

[0056] When the unloading solenoid valve 19 is energized, the high-pressure oil in the piston chamber 121 bypasses to the low-pressure side of the compressor through the unloading pipe 18. Under the action of the piston reset mechanism, the piston 122 and the slide valve 11 move to the left, and a portion of the refrigerant gas bypasses from the compression chamber back to the low-pressure side of the compressor, reducing the refrigerant discharge volume and thus reducing the cooling capacity. Figure 8 The diagram shown is a schematic of the compressor in a stable state.

[0057] In some embodiments, the piston cylinder transmission mechanism 12 further includes a piston reset mechanism, which is disposed in the piston chamber 121 and is used to drive the piston 122 to reset when the compressor is unloaded.

[0058] In some embodiments, such as Figure 9 As shown, the piston reset mechanism may include a reset pipe 23, which is connected between the side cavity of the piston chamber 121 and the piston rod 123 located on the same side and the high-pressure side of the compressor. A reset solenoid valve 24 is provided in the reset pipe 23. When the reset pipe 23 is open, the hydraulic oil on the high-pressure side enters the right side cavity of the piston chamber 121 through the pipe, which is used to push the piston 122 to the left to reduce the compressor capacity.

[0059] like Figure 10 The diagram shows the hydraulic oil entering the piston chamber 121 through the reset pipe 23 pushing the piston to the leftmost end, which is the compressor in the minimum load state.

[0060] In some embodiments, such as Figure 1 , Figure 2 As shown, the piston reset mechanism is a reset spring 124, which is located in the piston chamber 121 and on the same side as the piston rod 123. When the oil inlet solenoid valve 16 is opened, hydraulic oil enters the piston chamber 121 through the oil inlet pipe 13, driving the piston 122 to compress the reset spring 124. When the oil inlet solenoid valve 16 is closed and the unloading solenoid valve 19 is opened, the reset spring 124 resets, pushing the piston 122 to the left, and pushing the piston 122 to discharge the hydraulic oil through the unloading pipe 18, thereby reducing the compressor capacity.

[0061] In some embodiments, the operating states of the unloading solenoid valve 19 and the oil inlet solenoid valve 16 are mutually exclusive, that is, they are not opened or closed at the same time.

[0062] In order to improve the accuracy of the pressure switch 17 in detecting oil inlet, in some embodiments, the pressure switch 17 is located near the piston chamber 121 on the oil inlet pipe 13.

[0063] In some embodiments, the screw compressor further includes a rotor chamber 20, in which a rotor 21 is disposed. The rotor chamber 20 has a valve port 201 communicating with the low-pressure side of the compressor. A slide valve 11 is disposed on one side of the valve port 201. A piston cylinder transmission mechanism is used to drive the slide valve 11 to adjust the opening degree of the valve port 201.

[0064] When the slide valve 11 moves to the leftmost end, the valve port 201 is fully opened, and a portion of the refrigerant gas bypasses from the compression chamber back to the suction side, which reduces the amount of refrigerant discharged and the cooling capacity.

[0065] When the slide valve 11 moves to the rightmost end, the valve port 201 is completely closed, and the refrigerant gas cannot bypass the compression chamber back to the suction side. At this time, the effective compression volume in the compression chamber increases, which means that the discharge volume of the refrigerant gas increases, and the corresponding cooling capacity also increases.

[0066] In some embodiments, one end of the rotor chamber 20 is connected to the low-pressure side of the compressor, and the other end is connected to the high-pressure side of the compressor. When the compressor is working, the rotor 21 in the rotor chamber 20 is used to compress the refrigerant on the low-pressure side to the high-pressure side.

[0067] In some embodiments, rotor 21 can be, but is not limited to, a male-female rotor.

[0068] In some embodiments, the screw compressor also includes an oil sump 22, and the oil inlet pipe 13 is connected to the oil sump 22.

[0069] In some embodiments, the oil sump 22 is also connected to the high-pressure side of the compressor.

[0070] In some embodiments, an air conditioning system is also proposed, which includes a compressor, a condenser, an electronic expansion valve, and an evaporator to perform a refrigerant cycle for the system. The refrigerant cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0071] The compressor compresses the refrigerant gas at a low temperature and low pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0072] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0073] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0074] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0075] The compressor is a screw compressor, and the specific structure of the screw compressor can be referred to the above description, which will not be repeated here.

[0076] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0078] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A screw compressor, characterized in that, include: slide valve; A piston cylinder transmission mechanism, which is connected to the slide valve, is used to drive the slide valve to move; The piston cylinder transmission mechanism includes a piston chamber and a piston located in the piston chamber. The piston is connected to the slide valve through a piston rod. One of the chambers on the side opposite to the piston rod is connected to the high-pressure side of the compressor through an oil inlet pipe, and the other is connected to the low-pressure side of the compressor through a pressure regulating pipe. A pressure regulating solenoid valve is installed on the pressure regulating pipe.

2. The screw compressor according to claim 1, characterized in that, An oil inlet solenoid valve is installed on the oil inlet pipe, and the screw compressor further includes: A pressure switch is used to detect the oil pressure of the hydraulic oil entering the piston chamber through the oil inlet pipe and send it to the control module. The control module controls the opening and closing state of the pressure regulating solenoid valve according to the oil pressure.

3. The screw compressor according to claim 2, characterized in that, The screw compressor also includes: The unloading pipe further includes a cavity on the side opposite to the piston rod of the piston chamber, which is connected to the low-pressure side of the compressor via the unloading pipe. An unloading solenoid valve is installed on the unloading pipe. When the unloading solenoid valve is opened, the hydraulic oil in the piston chamber is discharged through the unloading pipe.

4. The screw compressor according to claim 3, characterized in that, The piston cylinder transmission mechanism also includes a piston reset mechanism, which is disposed in the piston chamber and is used to drive the piston to reset.

5. The screw compressor according to claim 4, characterized in that, The piston reset mechanism is a reset spring, which is located in the piston chamber and on the same side as the piston rod. When the oil inlet solenoid valve is opened, hydraulic oil enters the piston chamber through the oil inlet pipe, driving the piston to compress the reset spring. When the oil inlet solenoid valve is closed and the unloading solenoid valve is opened, the reset spring resets, pushing the piston to discharge the hydraulic oil through the unloading pipe.

6. The screw compressor according to claim 2, characterized in that, The pressure switch is located on the oil inlet pipe near the piston chamber.

7. The screw compressor according to any one of claims 1-6, characterized in that, The screw compressor also includes a rotor chamber, in which a rotor is disposed. The rotor chamber has a valve port that communicates with the low-pressure side of the compressor. A slide valve is disposed on one side of the valve port. The piston cylinder transmission mechanism is used to drive the slide valve to adjust the opening degree of the valve port.

8. The screw compressor according to claim 7, characterized in that, One end of the rotor cavity is connected to the low-pressure side of the compressor, and the other end is connected to the high-pressure side of the compressor.

9. The screw compressor according to any one of claims 1-6, characterized in that, The screw compressor also includes an oil tank, and the oil inlet pipe is connected to the oil tank.

10. An air conditioning system, characterized in that, It includes the screw compressor as described in any one of claims 1-9.

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