Rotary compressor, air conditioning system and control method

Abstract

The application provides a rotor compressor, an air conditioning system and a control method. The rotor compressor comprises an upper cylinder cover, a lower cylinder cover, a cylinder between the upper cylinder cover and the lower cylinder cover, and a rotor arranged in the cylinder. The upper cylinder cover or / and the lower cylinder cover is provided with a pressure relief channel communicating with a compression chamber of the cylinder. A first end of a pipeline is connected with the pressure relief channel, a second end of the pipeline is connected with a suction chamber of the cylinder or a device communicating with the suction chamber, and a first valve is arranged between the two ends of the pipeline and used for blocking or conducting the pipeline. The rotor compressor is provided with the pipeline connecting the compression chamber of the compressor and the suction chamber or the device communicating with the suction chamber. When the rotor compressor stops running, the valve of the pipeline is opened to accelerate the pressure difference between the high-pressure side and the low-pressure side of the balanced compressor, and the time required for restarting the rotor compressor after stopping is shortened.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to a rotary compressor, an air conditioning system, and a control method. Background Technology

[0002] After the air conditioning system stops, the high-pressure gas in the condenser pipes continues to flow back into the compressor. The volumes of the evaporator and condenser in the air conditioning system are much larger than the internal volume of the compressor casing / receiver. After the system stops, a large amount of high and low-pressure gas remains in the condenser and evaporator, respectively. This makes it difficult for the pressure difference between the high and low pressure sides of the compressor to decrease to a level that the motor torque can overcome in a short time. Under pressure differential conditions, due to the large pressure difference between the suction chamber and compression chamber inside the compressor's pump body, the gas resistance torque at startup is greater than the motor torque, especially for single-phase fixed-speed rotary compressors, whose motor torque is relatively small. Therefore, it often takes 3 to 5 minutes for the air conditioning system to restart after a shutdown.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] To address the problems in the prior art, the present invention aims to provide a rotary compressor, an air conditioning system, and a control method. The rotary compressor has a channel connecting the high-pressure side and the low-pressure side, which can accelerate the balancing of the pressure difference between the high-pressure side and the low-pressure side of the compressor and shorten the time required to restart the air conditioning system after shutdown.

[0005] A first aspect of the present invention provides a rotary compressor, including a compressor body and piping;

[0006] The compressor body includes an upper cylinder head, a lower cylinder head, and a cylinder between the upper cylinder head and the lower cylinder head, with a rotor inside the cylinder;

[0007] The upper cylinder head and / or lower cylinder head are provided with a pressure relief channel that connects to the compression chamber of the cylinder. The first end of the pipeline is connected to the pressure relief channel, and the second end of the pipeline is connected to the intake chamber of the cylinder or a device that connects to the intake chamber. A first valve is provided between the two ends of the pipeline, and the first valve is used to block or open the pipeline.

[0008] According to a first aspect of the invention, the device connected to the suction chamber includes a liquid storage tank, and the second end of the pipeline is connected to the liquid storage tank.

[0009] According to the first aspect of the present application, the pressure relief channel is in the shape of a straight line, one end of the straight line-shaped pressure relief channel penetrating the outer wall of the upper cylinder cover or lower cylinder cover, the other end of the straight line-shaped pressure relief channel penetrating the inner wall of the bearing hole of the upper cylinder cover or lower cylinder cover.

[0010] According to the first aspect of the present application, the pressure relief channel comprises a first channel and a vent groove, the vent groove being arranged on the end surface of the upper cylinder cover or lower cylinder cover facing the cylinder, the first channel being arranged in the radial direction, one end of the first channel being connected with the first end of the pipeline, the other end of the first channel being connected with the vent groove.

[0011] According to the first aspect of the present application, the projection of the vent groove on the cylinder is between the bearing hole of the upper cylinder cover or lower cylinder cover and the exhaust hole of the upper cylinder cover or lower cylinder cover.

[0012] According to the first aspect of the present application, the vent groove is a ring groove surrounding the bearing hole.

[0013] According to the first aspect of the present application, the length of the outer circle of the ring groove farthest from the center of the bearing hole is not greater than the length of the outer circle of the rotor closest to the center of the bearing hole when the rotor rotates.

[0014] According to the first aspect of the present application, the vent groove is an arc-shaped groove, the central angle of the arc-shaped groove corresponding to at least the exhaust hole.

[0015] According to the first aspect of the present application, the central angle α of the arc-shaped groove corresponding to at least the exhaust hole satisfies 0≤α≤45°.

[0016] According to the first aspect of the present application, the vent groove is in the shape of a hole, and after being connected with the first channel, the vent groove is in the shape of L, the projection of the hole-shaped vent groove on the cylinder being located on the compression chamber side of the cylinder.

[0017] According to the first aspect of the present application, the cylinder is provided with a vane groove, the included angle between the line connecting the center of the bearing hole of the upper cylinder cover and the center line of the vane groove of the hole-shaped vent groove being β, and satisfying 0≤β≤45°.

[0018] According to the first aspect of the present application, a check valve is arranged in the exhaust pipe of the compressor body.

[0019] According to the first aspect of the present application, the check valve is a one-way electromagnetic valve.

[0020] The second aspect of the present application provides an air conditioning system comprising the above-mentioned rotary compressor and a controller, wherein the controller acquires the state of the rotary compressor, and controls to open the first valve to make the pipeline conductive when the rotary compressor is in a stop state, and controls to close the first valve to make the pipeline occlusive when the rotary compressor is in a running state and the rotating speed of the rotary compressor is greater than or equal to a set reference value.

[0021] According to the second aspect of the present application, a check valve is arranged at the exhaust pipe of the compressor body.

[0022] The third aspect of the present application provides a control method of an air conditioning system, which is suitable for the air conditioning system, and comprises the following steps:

[0023] acquiring the state of the rotary compressor;

[0024] when the rotary compressor is in a stop state, closing the check valve to make the exhaust pipe occlusive and opening the first valve to make the pipeline conductive;

[0025] when the rotary compressor is in a running state, opening the check valve to make the exhaust pipe conductive, and closing the first valve to make the pipeline occlusive when the rotating speed of the rotary compressor is greater than or equal to a set reference value.

[0026] The rotary compressor of the present application is provided with a pipeline connecting the compressor compression cavity and the device communicating with the suction cavity of the compressor, and when the rotary compressor stops running, the valve of the control pipeline is opened to accelerate the pressure difference between the high-pressure side and the low-pressure side of the balanced compressor, so as to avoid that the gas resistance torque is greater than the motor torque at the starting moment, and shorten the time required for restarting after the rotary compressor stops. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the present application. Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof as illustrated in the drawings. It will be readily understood that the drawings are merely illustrative of certain embodiments of the present application and that the present application can be embodied in other ways without departing from the spirit and essential characteristics of the present application. It is to be noted that the drawings are merely schematic and are not drawn to scale. Like reference numerals in the drawings denote like parts, and thus repeated description thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities, which do not necessarily have to correspond to physically or logically independent entities.

[0028] Figure 1 The structural schematic diagram of an air conditioning system comprising a rotary compressor according to an embodiment of the present application is shown in the figure;

[0029] Figure 2 Structure diagram of an upper cylinder head according to a first embodiment of the present application;

[0030] Figure 3 Structure diagram of an upper cylinder head according to a second embodiment of the present application;

[0031] Figure 4 Cross-sectional view of a pump body assembly of a rotary compressor according to the second embodiment of the present application;

[0032] Figure 5 Cross-sectional view of a pump body assembly of a rotary compressor according to a third embodiment of the present application;

[0033] Figure 6 Structure diagram of an upper cylinder head according to a fourth embodiment of the present application; and

[0034] Figure 7 Cross-sectional view of a pump body assembly of a rotary compressor according to the fourth embodiment of the present application. DETAILED DESCRIPTION

[0035] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations can be implemented in any

[0036] In the description of the specification, expressions of the term "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials or characteristics represented with the embodiment or example are included in at least one embodiment or example of the specification. Also, the specific features, structures, materials or characteristics represented can be combined in an appropriate way in any one or more embodiments or examples. In addition, the skilled person can combine and combine the features of different embodiments or examples and the features of different embodiments or examples represented in the specification without contradiction.

[0037] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" in which other elements are interposed therebetween. Relative spatial terms such as "lower", "upper", and the like can be used for the sake of easier explanation of the relationship of one device with respect to another device illustrated in the drawings. Such terms refer not only to the meaning indicated in the drawings, but also to other meanings or operations of the device in use. For example, if the device in the drawing is turned upside down, a device that was explained as being "lower" than the other device is explained as being "upper" than the other device. Thus, the exemplary term "lower" includes both upper and lower. The device can be rotated by 90° or other angles, and the relative spatial terms are also interpreted accordingly.

[0038] Although the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are described. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", when used herein, specify the presence of stated features, steps, operations, elements, components, items, kinds and / or groups but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, items, kinds and / or groups thereof. As used herein, the terms "or" and "and / or" are construed to be inclusive, or mean either one or any combination thereof. Thus, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition are only present when elements, functions, steps or operations are inherently mutually exclusive between different embodiments.

[0039] Although not differently defined, technical and scientific terms used herein include the technical terms and scientific terms as commonly understood by one of ordinary skill in the art to which this specification belongs. Terms defined in commonly used dictionaries are to be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted only in an ideal or extremely formal sense unless clearly defined otherwise.

[0040] In view of the problems in the prior art, the application provides a rotary compressor, an air conditioning system and a control method, the rotary compressor comprising a compressor body and a pipeline; the compressor body comprising an upper cylinder cover, a lower cylinder cover, a cylinder between the upper cylinder cover and the lower cylinder cover, and a rotor arranged in the cylinder; the upper cylinder cover or / and the lower cylinder cover being provided with a pressure relief channel communicating with a compression chamber of the cylinder, a first end of the pipeline being connected with the pressure relief channel, a second end of the pipeline being connected with a suction chamber of the cylinder or a device communicating with the suction chamber, and a first valve being arranged between the two ends of the pipeline and used for blocking or conducting the pipeline. The device communicating with the suction chamber comprises but is not limited to a liquid storage tank, a pipeline communicating with the liquid storage tank or the suction chamber of the cylinder in the air conditioning system, etc., and the liquid storage tank comprises but is not limited to an air inlet pipe of the liquid storage tank, an outer shell of the liquid storage tank or an air outlet pipe of the liquid storage tank. The rotary compressor provided with the pipeline connecting the compression chamber of the compressor and the device communicating with the suction chamber or the suction chamber can accelerate the pressure difference between the high-pressure side and the low-pressure side of the compressor when the air conditioning system using the rotary compressor is stopped, and shorten the time required for restarting the air conditioning system after the air conditioning system is stopped.

[0041] The rotary compressor, the air conditioning system and the control method of the application will be further described below in combination with the drawings and specific embodiments, and it should be understood that each specific embodiment is not a limitation on the protection scope of the application.

[0042] Figure 1 Fig. 1 is a structural schematic diagram of an air conditioning system comprising a rotary compressor according to an embodiment of the application, wherein the rotary compressor comprises a compressor body 1, a liquid storage tank 2 and a pipeline 9; the compressor body comprising an upper cylinder cover 11, a lower cylinder cover, a cylinder 13 between the upper cylinder cover 11 and the lower cylinder cover, and the upper cylinder cover 11 being provided with a pressure relief channel 111 communicating with a compression chamber of the cylinder 13, and the pipeline 9 being connected with the pressure relief channel 111 and an air inlet 21 of the liquid storage tank 2 at two ends respectively.

[0043] Figure 2The structure diagram of the upper cylinder cover of the first embodiment of the present application, the compressor body of the first embodiment comprises an upper cylinder cover 11a, a lower cylinder cover, a cylinder 13 between the upper cylinder cover 11a and the lower cylinder cover; the upper cylinder cover 11a is provided with a pressure relief channel 111 communicating with the compression chamber of the cylinder 13, more specifically, the pressure relief channel 111 in the first embodiment is a one-dimensional pressure relief channel 111a, one end of the one-dimensional pressure relief channel 111a is arranged on the outer wall of the upper cylinder cover 11a and is communicated with the first end of the pipeline 9, the other end of the one-dimensional pressure relief channel 111a is arranged on the inner wall of the bearing hole 119 of the upper cylinder cover 11a, that is, the other end of the one-dimensional pressure relief channel 111a is communicated with the bearing hole 119 of the upper cylinder cover 11a, at this time, the one-dimensional pressure relief channel 111a is communicated with the compression chamber of the cylinder 13 through the bearing hole 119, the second end of the pipeline 9 is communicated with the gas inlet 21 of the liquid storage tank 2, and a first valve 91 is arranged between the two ends of the pipeline.

[0044] The structure of the upper cylinder cover of the present application is not limited to the application in the single-cylinder structure rotary compressor, and is applicable to the double-cylinder or multi-cylinder compressor, such as Figure 1 In the embodiment, the compressor is a double-cylinder compressor, and the compressor body further comprises a shell, a motor accommodated in the shell, a crankshaft rotating under the drive of the motor, a pump body assembly fixedly installed at the lower end of the crankshaft, and the like, wherein the pump body assembly comprises, from top to bottom, an upper cylinder cover 11, an upper cylinder 13, an intermediate plate 14, a lower cylinder 15, and a lower cylinder cover 16 arranged along the axial direction of the crankshaft. The upper cylinder and the lower cylinder are respectively provided with a gas inlet connected with the liquid storage tank 2. The upper cylinder cover 11 can have the same structure as the upper cylinder cover 11a of the first embodiment or the same structure as the upper cylinder cover described below. The structure of the upper cylinder cover of the present application is also applicable to the lower cylinder cover.

[0045] Figure 3 The structure diagram of the upper cylinder cover 11b of the second embodiment of the present application, Figure 4 The cross-sectional view of the pump body assembly (the upper cylinder cover 11b combined with the cylinder 13) of the rotary compressor of the second embodiment of the present application; in the second embodiment, the pressure relief channel 111 comprises a first channel 111b and a vent groove, and the difference from the first embodiment is that the vent groove is arranged on the end face of the upper cylinder cover 11b facing the cylinder 13, the first channel 111b is arranged in the radial direction, specifically in a one-dimensional shape, one end of the first channel 111b is connected with the first end of the pipeline 9, and the other end of the first channel 111b is communicated with the vent groove, that is, the first channel 111b is communicated with the compression chamber of the cylinder 13 through the vent groove.

[0046] Further, in one embodiment of the vent groove, the projection of the vent groove on the cylinder 13 is between the bearing hole 119 of the upper cylinder cover and the exhaust hole 117 of the upper cylinder cover.

[0047] Specifically, as shown in the second embodiment, the vent groove is a ring groove 118a surrounding the bearing hole 119. The first channel 111b is connected to the ring groove 118a, and the first channel 111b can be arranged at any radial angle position of the upper cylinder cover 11b.

[0048] It should be noted that, in order to avoid the influence of the vent groove 118a on the compression efficiency, the length of the outer circle of the ring groove 118a farthest from the center of the bearing hole 119 is not greater than the length of the outer circle of the rotor in the cylinder 13 closest to the center of the bearing hole 119. By this limitation, the suction chamber is connected to the compression chamber through the ring groove 118a, and the compression efficiency is not affected during normal operation of the compressor. For the case where the cylinder 13 is provided with a piston sleeved outside the eccentric part of the crankshaft, the outer circle of the rotor in the cylinder 13 refers to the outer circle of the piston; for the case where the cylinder 13 is not provided with a piston, the outer circle of the rotor in the cylinder refers to the outer circle of the eccentric part of the crankshaft.

[0049] Please continue to see Figure 5 The third embodiment of the application shown in the figure is also an embodiment of the vent groove. Different from the second embodiment, the vent groove on the upper cylinder cover 11c is an arc-shaped groove 118b, and the central angle a of the arc-shaped groove 118b covers at least the exhaust hole 117. More specifically, the central angle a satisfies 0≤a≤45°.

[0050] In another embodiment of the vent groove, the projection of the vent groove on the cylinder 13 is located in the compression chamber of the cylinder 13. Please see the fourth embodiment of the application shown in the figure. Figure 6 The structure diagram of the upper cylinder cover 11d of the fourth embodiment of the application is shown in the figure. The vent groove is in the form of a hole, and the hole-shaped vent groove 118c is L-shaped after being connected to the first channel 111b. One end of the first channel 111b is arranged on the outer wall of the upper cylinder cover 11d and is connected to the first end of the pipeline 9. The projection of the hole-shaped vent groove 118c in the axial direction falls into the compression chamber. The cylinder 13 is provided with a vane groove 131, and the center line of the vane groove 131 passes through the center O of the bearing hole 119 of the upper cylinder cover 11d. Preferably, the angle β between the connecting line OO' of the center O of the bearing hole 119 of the upper cylinder cover 11d and the center line OP' of the vane groove is 0≤β≤45°, as shown in the figure. Figure 7

[0051] ​In some other embodiments, the discharge pipe 12 of the compressor body is provided with a check valve 121. The check valve 121 can be a one-way valve or a one-way electromagnetic valve. When the check valve is open, gas flows from the inside of the discharge pipe 12 to the outside of the discharge pipe 12. After the compressor body is stopped, the check valve 121 is closed, which can cut off the high-pressure backflow gas from the outside of the compressor, such as the condenser, and reduce the high-pressure gas volume that needs to be balanced.

[0052] It should be noted that the rotary compressor of the present application is not limited to the above-described double-cylinder compressor, and is also applicable to single-cylinder compressors and multi-cylinder compressors. When the compressor is a single-cylinder compressor, the compressor body includes an upper cylinder cover, a lower cylinder cover, and a cylinder body between the upper cylinder cover and the lower cylinder cover; the pressure relief passage is provided on the upper cylinder cover or the lower cylinder cover as needed, and the pressure relief passage is in communication with the compression chamber of the compressor body. The communication manner of the pressure relief passage with the compression chamber of the compressor body is not limited, and in this case, the first end of the pipeline is in communication with the compression chamber of the compressor body through the pressure relief passage, which will not be described here again.

[0053] The present application also provides an air conditioning system, as shown in Figure 1 , which includes a rotary compressor, a four-way valve 3, an evaporator 4, a throttling device 5, a condenser 6, and a controller. The discharge pipe 12 of the compressor body 1, the four-way valve 3, the evaporator 4, the throttling device 5, the condenser 6, and the liquid storage tank 2 form a first circuit; the compression chamber of the compressor body 1, the liquid storage tank 2, and the suction chamber of the compressor body 1 form a second circuit. The controller obtains the state of the rotary compressor, such as when the rotary compressor is stopped, controls the opening of the first valve to make the pipeline conductive, and such as when the rotary compressor has a rotational speed greater than or equal to a set reference value, controls the closing of the first valve to make the pipeline occluded.

[0054] The present application also provides a control method of an air conditioning system, which is applicable to the air conditioning system. The control method includes the following steps:

[0055] Obtaining the state of the rotary compressor;

[0056] If the rotary compressor is in a stopped state, closing the check valve to occlude the discharge pipe and opening the first valve to make the pipeline conductive;

[0057] If the rotary compressor is in a running state, opening the check valve to make the discharge pipe conductive, accelerating the pressure difference between the high-pressure side and the low-pressure side of the compressor, and shortening the time required for restarting the air conditioning system after the air conditioning system is stopped; and if the rotary compressor has a rotational speed greater than or equal to a set reference value, closing the first valve to make the pipeline occluded.

[0058] Taking an existing rotor compressor as an example, under the condition of suction / exhaust pressure difference of 2.5 MPa, the time for the air conditioning system to restart after shutdown is 148 seconds. When the rotor compressor of the structure is additionally provided with the pipeline structure of the application, the time for the air conditioning system to restart after shutdown is 52 seconds. Further, when a check valve is additionally provided in the exhaust pipe of the rotor compressor, the pipeline is connected to the unloading passage of the upper cylinder cover and the inlet pipe of the liquid storage tank, and the time for the air conditioning system to restart after shutdown is 23 seconds. It can be seen that the rotor compressor of the application can effectively shorten the time required for the air conditioning system to restart after shutdown.

[0059] The above is a further detailed description of the application in combination with specific preferred embodiments, and the specific implementation of the application should not be limited to these descriptions. It is obvious for those skilled in the art that the application is not limited to the details of the above exemplary embodiments, and the application can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A rotary compressor characterized by comprising: The compressor body comprises an upper cylinder cover, a lower cylinder cover, and a cylinder between the upper cylinder cover and the lower cylinder cover, and a rotor is arranged in the cylinder; The upper cylinder cover or / and the lower cylinder cover is provided with a pressure relief passage communicating with a compression chamber of the cylinder, a first end of the pipeline is connected with the pressure relief passage, a second end of the pipeline is connected with a suction chamber of the cylinder or a device communicating with the suction chamber, and a first valve is arranged between the two ends of the pipeline to close or open the pipeline; The device communicating with the suction chamber comprises a liquid storage tank, and the second end of the pipeline is connected with the liquid storage tank; The pressure relief passage comprises a first passage and a vent groove, the vent groove is arranged on an end surface of the upper cylinder cover or the lower cylinder cover facing the cylinder, and the first passage is arranged in a radial direction, one end of the first passage is connected with the first end of the pipeline, and the other end of the first passage is connected with the vent groove. A projection of the vent groove on the cylinder is between a bearing hole of the upper cylinder cover or the lower cylinder cover and an exhaust hole of the upper cylinder cover or the lower cylinder cover.

2. The rotary compressor of claim 1, wherein The vent groove is a ring groove surrounding the bearing hole.

3. The rotary compressor of claim 2, wherein A length of an outer ring of the ring groove farthest from the center of the bearing hole is not greater than a length of an outer ring of the rotor closest to the center of the bearing hole when the rotor rotates.

4. The rotary compressor according to claim 3, characterized by The vent groove is an arc-shaped groove, and a central angle corresponding to the arc-shaped groove covers at least the exhaust hole.

5. The rotary compressor of claim 2, wherein A central angle α corresponding to the arc-shaped groove satisfies 0≤α≤45°.

6. The rotary compressor according to claim 5, wherein The vent groove is a hole, and after being connected with the first passage, the vent groove is in an L shape, and a projection of the hole-shaped vent groove on the cylinder is in a compression chamber of the cylinder.

7. The rotary compressor of claim 1, wherein A center line of a vane groove of the cylinder and a connecting line connecting centers of bearing holes of the upper cylinder cover of the hole-shaped vent groove form an angle β, and 0≤β≤45° is satisfied.

8. The rotary compressor according to claim 7, wherein A check valve is arranged in an exhaust pipe of the compressor body.

9. The rotary compressor according to any one of claims 1 to 8, characterized by The check valve is a one-way electromagnetic valve.

10. The rotary compressor of claim 9, wherein The compressor body and the controller of any one of claims 1 to 8, the controller acquires a state of the rotary compressor, when the rotary compressor is stopped, controls to open the first valve to make the pipeline open, when a rotating speed of the rotary compressor is greater than or equal to a set reference value, controls to close the first valve to make the pipeline close.

11. An air conditioning system, characterised in that, A check valve is arranged in an exhaust pipe of the compressor body.

12. The air conditioning system of claim 11, wherein, The air conditioning system of claim 12, the control method comprises the following steps:

13. A control method of an air conditioning system, characterized by, Acquiring a state of the rotary compressor; When the rotary compressor is in a stopped state, closing the check valve to make the exhaust pipe close and opening the first valve to make the pipeline open; When the rotary compressor is in a running state, opening the check valve to make the exhaust pipe open, and when a rotating speed of the rotary compressor is greater than or equal to a set reference value, closing the first valve to make the pipeline close. ​

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