Rotor compressor, air conditioning system and control method

Abstract

The invention provides a rotor type compressor, an air conditioning system and a control method. The rotor type compressor comprises an upper cylinder cover, a lower cylinder cover and an air cylinder between the upper cylinder cover and the lower cylinder cover, and a rotor is arranged in the air cylinder; the upper cylinder cover or / and the lower cylinder cover is / are provided with a pressure relief channel communicated with a compression cavity of the air cylinder, the first end of the pipeline is connected with the pressure relief channel, the second end of the pipeline is communicated with an air suction cavity of the air cylinder or a device communicated with the air suction cavity, and a first valve is arranged between the two ends of the pipeline. The first valve is used for closing or opening the pipeline. The rotor type compressor is provided with the pipeline for connecting the compression cavity and the air suction cavity of the compressor or the device communicated with the air suction cavity, when the rotor type compressor stops running, the valve for controlling the pipeline is opened, the pressure difference between the high-pressure side and the low-pressure side of the compressor is balanced, and the pressure difference is reduced. And the time required for restarting the rotor type compressor after shutdown is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a rotor type compressor, an air conditioning system and a control method. Background Art

[0002] After the air conditioning system is shut down, the high-pressure gas in the condenser pipeline will continue to flow back into the compressor. The volume of the evaporator and condenser in the air conditioning system is much larger than the volume inside the compressor housing / liquid reservoir. After the system is shut down, a large amount of high-pressure and low-pressure gas remains in the system condenser and evaporator, respectively, making it difficult to reduce the pressure difference on the high / low gas side of the compressor to a level that can be overcome by the motor torque in a short period of time after the system is shut down. In the case of pressure difference, due to the large pressure difference between the suction chamber and the compression chamber inside the compressor pump body, the gas resistance torque at the moment of startup is greater than the motor torque, especially for single-phase fixed-speed rotor compressors, whose motor torque is relatively small. The air conditioning system often takes 3 to 5 minutes to restart after being shut down.

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

[0004] In response to the problems in the prior art, the purpose of the present invention is 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 speed up 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, comprising a compressor body and a pipeline;

[0006] The compressor body comprises an upper cylinder head, a lower cylinder head, and a cylinder between the upper cylinder head and the lower cylinder head, wherein a rotor is arranged in the cylinder;

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

[0008] According to the first aspect of the present invention, the device connected to the suction cavity 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 invention, the pressure relief channel is in a straight line shape, one end of the straight line pressure relief channel passes through the outer wall of the upper cylinder head or the lower cylinder head, and the other end of the straight line pressure relief channel passes through the inner wall of the bearing hole of the upper cylinder head or the lower cylinder head.

[0010] According to a first aspect of the present invention, the pressure relief channel includes a first channel and a ventilation groove, the ventilation groove is arranged on the end surface of the upper cylinder head or the lower cylinder head facing the cylinder, the first channel is arranged radially, one end of the first channel is connected to the first end of the pipeline, and the other end of the first channel is connected to the ventilation groove.

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

[0012] According to the first aspect of the present invention, the ventilation groove is an annular groove surrounding the bearing hole.

[0013] According to the first aspect of the present invention, the farthest distance between the outer ring of the annular groove and the center of the bearing hole is not greater than the shortest distance between the outer ring of the rotor and the center of the bearing hole when the rotor rotates.

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

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

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

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

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

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

[0020] The second aspect of the present invention provides an air-conditioning system, comprising the rotary compressor and a controller, wherein the controller obtains the status of the rotary compressor. For example, when the rotary compressor is stopped, the controller controls the opening of the first valve to make the pipeline conductive. For example, when the rotation speed of the rotary compressor is greater than or equal to a set reference value, the controller controls the closing of the first valve to block the pipeline.

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

[0022] A third aspect of the present invention provides a control method for an air conditioning system, which is applicable to the air conditioning system, and the control method comprises the following steps:

[0023] Get the status of the rotary compressor;

[0024] If the rotary compressor is in a stopped state, the check valve is closed to block the exhaust pipe, and the first valve is opened to open the pipeline;

[0025] If the rotary compressor is in operation, the check valve is opened to open the exhaust pipe. If the speed of the rotary compressor is greater than or equal to a set reference value, the first valve is closed to block the pipeline.

[0026] The rotary compressor of the present invention is provided with a pipeline connecting the compressor compression chamber and the compressor suction chamber or a device connected to the suction chamber. When the rotary compressor stops running, the valve of the control pipeline is opened to accelerate the balance of the pressure difference between the high-pressure side and the low-pressure side of the compressor, avoid the gas resistance torque at the moment of starting being greater than the motor torque, and shorten the time required for restarting the rotary compressor after shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more apparent. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same figure numbers in the figures represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0028] Figure 1 A schematic structural diagram of an air conditioning system including a rotary compressor according to an embodiment of the present invention;

[0029] Figure 2 It is a structural schematic diagram of an upper cylinder cover according to a first embodiment of the present invention;

[0030] Figure 3 It is a structural schematic diagram of an upper cylinder cover according to a second embodiment of the present invention;

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

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

[0033] Figure 6 is a schematic structural diagram of an upper cylinder head according to a fourth embodiment of the present invention; and

[0034] Figure 7 FIG. 4 is a cross-sectional view of a pump body assembly of a rotary compressor according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0035] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0036] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of this specification. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples represented in this specification without contradiction.

[0037] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the situation of "direct connection" but also the situation of "indirect connection" by placing other elements therebetween. Terms indicating relative spaces such as "below" and "above" may be used to more easily explain the relationship of one device illustrated in the accompanying drawings relative to another device. Such terms refer not only to the meanings indicated in the accompanying drawings, but also to other meanings or operations of the device in use. For example, if the device in the accompanying drawings is turned over, a device that was described as being "below" other devices is described as being "above" other devices. Therefore, the exemplary term "below" includes both above and below. The device can be rotated 90° or other angles, and the terms representing relative spaces are interpreted accordingly.

[0038] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "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". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0039] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which this specification belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the relevant technical literature and the contents of the current disclosure, and unless defined, shall not be overly interpreted as ideal or very formal meanings.

[0040] In view of the problems in the prior art, the present invention provides a rotary compressor, an air conditioning system and a control method, wherein the rotary compressor comprises a compressor body and a pipeline; the compressor body comprises an upper cylinder head, a lower cylinder head, a cylinder between the upper cylinder head and the lower cylinder head, and a rotor is arranged in the cylinder; the upper cylinder head or / and the lower cylinder head are provided with a pressure relief channel connected to the compression chamber of the cylinder, the first end of the pipeline is connected to the pressure relief channel, the second end of the pipeline is connected to the suction chamber of the cylinder or a device connected to the suction chamber, and a first valve is arranged between the two ends of the pipeline, and the first valve is used to block or conduct the pipeline. The device connected to the suction chamber includes but is not limited to a liquid storage tank, a pipeline connected to the liquid storage tank or the suction chamber of the cylinder in the air conditioning system, etc. The liquid storage tank includes but is not limited to the inlet pipe of the liquid storage tank, the outer shell of the liquid storage tank or the outlet pipe of the liquid storage tank. The rotary compressor of the present invention is provided with a pipeline connecting the compression chamber of the compressor and the suction chamber or a device connected to the suction chamber. When the air-conditioning system using the rotary compressor stops running, the valve of the control pipeline is opened to speed up the pressure difference between the high-pressure side and the low-pressure side of the compressor to balance, thereby shortening the time required to restart the air-conditioning system after shutdown.

[0041] The rotary compressor, air conditioning system and control method of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the various specific embodiments are not intended to limit the scope of protection of the present invention.

[0042] Figure 1 This is a structural schematic diagram of an air-conditioning system including a rotary compressor according to an embodiment of the present invention, wherein the rotary compressor includes a compressor body 1, a liquid storage tank 2 and a pipeline 9; the compressor body includes an upper cylinder head 11, a lower cylinder head, and a cylinder 13 between the upper cylinder head 11 and the lower cylinder head, the upper cylinder head 11 is provided with a pressure relief channel 111 connected to the compression chamber of the cylinder 13, and both ends of the pipeline 9 are respectively connected to the pressure relief channel 111 and the air inlet 21 of the liquid storage tank 2.

[0043] Figure 21 is a schematic diagram of the structure of the upper cylinder head of the first embodiment of the present invention. The compressor body of the first embodiment includes an upper cylinder head 11a, a lower cylinder head, and a cylinder 13 between the upper cylinder head 11a and the lower cylinder head; the upper cylinder head 11a is provided with a pressure relief channel 111 connected to the compression chamber of the cylinder 13. More specifically, the pressure relief channel 111 in the first embodiment is a straight-line pressure relief channel 111a, one end of which is provided on the outer wall of the upper cylinder head 11a and connected to the pipe. The first end of the pipeline 9 is connected, and the other end of the I-shaped 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 I-shaped pressure relief channel 111a is connected to the bearing hole 119 of the upper cylinder cover 11a. At this time, the I-shaped pressure relief channel 111a is connected to the compression chamber of the cylinder 13 through the bearing hole 119, the second end of the pipeline 9 is connected to the air 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 invention is not limited to being applicable to a rotor type compressor with a single cylinder structure, but is also applicable to a dual cylinder or multi cylinder compressor, such as Figure 1 In the embodiment of the present invention, the compressor is a two-cylinder compressor, and the compressor body also includes a housing, a motor accommodated in the housing, a crankshaft driven by the motor, a pump body assembly fixedly mounted on the lower end of the crankshaft, etc., wherein the pump body assembly includes an upper cylinder head 11, an upper cylinder 13, an intermediate plate 14, a lower cylinder 15 and a lower cylinder head 16 arranged in sequence along the axial direction of the crankshaft from top to bottom. The upper cylinder and the lower cylinder are respectively provided with an air intake port connected to the liquid storage tank 2. The upper cylinder head 11 may have the same structure as the upper cylinder head 11a of the first embodiment or the same structure as the upper cylinder head described later. The structure of the upper cylinder head of the present invention is also applicable to the lower cylinder head.

[0045] Figure 3 is a schematic structural diagram of an upper cylinder cover 11b according to a second embodiment of the present invention, Figure 4 It is a cross-sectional view of the pump body assembly of the rotary compressor of the second embodiment of the present invention (after the upper cylinder cover 11b is combined with the cylinder 13); in the second embodiment, the pressure relief channel 111 includes a first channel 111b and a ventilation groove. Different from the first embodiment, the ventilation groove is arranged on the end surface of the upper cylinder cover 11b facing the cylinder 13, and the first channel 111b is arranged radially, specifically in a straight line shape. One end of the first channel 111b is connected to the first end of the pipeline 9, and the other end of the first channel 111b is connected to the ventilation groove, that is, the first channel 111b is connected to the compression chamber of the cylinder 13 through the ventilation groove.

[0046] Furthermore, in one embodiment of the ventilation groove, a projection of the ventilation 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 ventilation groove is an annular groove 118a surrounding the bearing hole 119. The first channel 111b is connected to the annular 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 prevent the compression efficiency from being affected by the blowby of the annular groove 118a, the outer ring of the annular groove 118a is required to be no longer than the shortest distance between the outer ring of the rotor and the center of the bearing hole 119 when the rotor in the cylinder 13 rotates. This limitation can prevent the suction chamber from connecting to the compression chamber through the annular groove 118a, and will not affect the compression efficiency when the compressor is operating normally. In the case where a piston is provided in the cylinder 13 and is sleeved outside the eccentric part of the crankshaft, the outer ring of the rotor in the cylinder 13 refers to the outer ring of the piston; in the case where no piston is provided in the cylinder 13, the outer ring of the rotor in the cylinder refers to the outer ring of the eccentric part of the crankshaft.

[0049] Please continue to see Figure 5 The third embodiment of the present invention is also an implementation of the ventilation groove. Different from the second embodiment, in the third embodiment, the ventilation groove on the upper cylinder head 11c is an arc-shaped groove 118b, and the central angle α corresponding to the arc-shaped groove 118b at least covers the exhaust hole 117. More specifically, the central angle α satisfies 0≤α≤45°.

[0050] In another embodiment of the ventilation groove, the projection of the ventilation groove on the cylinder 13 is located in the compression chamber of the cylinder 13. Figure 6 The schematic diagram of the structure of the upper cylinder head 11d of the fourth embodiment of the present invention is shown. Wherein, the ventilation groove is in the shape of a hole, and the hole-shaped ventilation groove 118c is L-shaped after being connected with the first channel 111b. One end of the first channel 111b is arranged on the outer wall of the upper cylinder head 11d and is connected with the first end of the pipeline 9. The projection of the hole-shaped ventilation groove 118c along the axial direction falls into the compression chamber. The cylinder 13 is provided with a blade groove 131, and the center line of the blade groove 131 passes through the center O of the bearing hole 119 of the upper cylinder head 11d. Preferably, the angle between the line OO' connecting the center O' of the hole-shaped ventilation groove 118c and the center O of the bearing hole 119 of the upper cylinder head 11d and the center line OP' of the blade groove is β, and satisfies: 0≤β≤45°, such as Figure 7 shown.

[0051] In some other embodiments, a check valve 121 is provided at the exhaust pipe 12 of the compressor body. The check valve 121 may be a one-way valve or a one-way solenoid valve. When the check valve is opened, the gas flows from the inside of the exhaust pipe 12 to the outside of the exhaust pipe 12. After the compressor body is shut down, the check valve 121 is closed, which can cut off the high-pressure reflux gas from outside the compressor, such as the condenser, and reduce the volume of high-pressure gas that needs to be balanced.

[0052] It should be noted that the rotary compressor of the present invention is not limited to the two-cylinder compressor described above, 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 head, a lower cylinder head, and a cylinder body between the upper cylinder head and the lower cylinder head; the upper cylinder head or the lower cylinder head is selected to set a pressure relief channel as needed, and the pressure relief channel is connected to the compression chamber of the compressor body. The way in which the pressure relief channel is connected to the compression chamber of the compressor body is not limited. At this time, the first end of the pipeline is connected to the compression chamber of the compressor body through the pressure relief channel, which will not be repeated here.

[0053] The present invention also provides an air conditioning system, Figure 1 The air conditioning system includes a rotary compressor, a four-way valve 3, an evaporator 4, a throttling device 5, a condenser 6 and a controller. The exhaust 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. For example, when the rotary compressor is stopped, the controller controls the opening of the first valve to make the pipeline conductive. For example, when the speed of the rotary compressor is greater than or equal to the set reference value, the controller controls the closing of the first valve to block the pipeline.

[0054] The present invention also provides a control method for an air conditioning system, which is applicable to the air conditioning system, and the control method comprises the following steps:

[0055] Get the status of the rotary compressor;

[0056] If the rotary compressor is in a stopped state, the check valve is closed to block the exhaust pipe, and the first valve is opened to open the pipeline;

[0057] If the rotary compressor is in operation, the check valve is opened to open the exhaust pipe, thereby accelerating the balance of the pressure difference between the high-pressure side and the low-pressure side of the compressor and shortening the time required to restart the air-conditioning system after shutdown; if the speed of the rotary compressor is greater than or equal to the set reference value, the first valve is closed to block the pipeline.

[0058] Taking an existing rotary compressor as an example, under the condition of an intake / exhaust pressure difference of 2.5MPa, the time for the air conditioning system to shut down and restart is 148 seconds. When the rotary compressor of this structure is equipped with the pipeline structure of the present invention, the time for the air conditioning system to shut down and restart is 52 seconds. Furthermore, when a check valve is added to the exhaust pipe of the rotary compressor, the pressure relief channel of the upper cylinder cover and the intake pipe of the liquid storage tank are connected by a pipeline, and the time for the air conditioning system to shut down and restart is 23 seconds. It can be seen that the use of the rotary compressor of the present invention can effectively shorten the time required for the air conditioning system to restart after shutting down.

[0059] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A rotary compressor, characterized in that: Including compressor body and pipeline; The compressor body comprises an upper cylinder head, a lower cylinder head, and a cylinder between the upper cylinder head and the lower cylinder head, wherein a rotor is arranged in the cylinder; The upper cylinder head and / or the lower cylinder head is provided with a pressure relief channel connected to the compression chamber of the cylinder, the first end of the pipeline is connected to the pressure relief channel, the second end of the pipeline is connected to the suction chamber of the cylinder or a device connected to the suction chamber, and a first valve is provided between the two ends of the pipeline, and the first valve is used to block or conduct the pipeline.

2. The rotary compressor according to claim 1, characterized in that: The device connected to the air suction cavity includes a liquid storage tank, and the second end of the pipeline is connected to the liquid storage tank.

3. The rotary compressor according to claim 1, characterized in that: The pressure relief channel is in a straight line shape, one end of the straight line pressure relief channel passes through the outer wall of the upper cylinder cover or the lower cylinder cover, and the other end of the straight line pressure relief channel passes through the inner wall of the bearing hole of the upper cylinder cover or the lower cylinder cover.

4. The rotary compressor according to claim 1, characterized in that: The pressure relief channel includes a first channel and a ventilation groove, wherein the ventilation groove is arranged on the end surface of the upper cylinder head or the lower cylinder head facing the cylinder, the first channel is arranged radially, one end of the first channel is connected to the first end of the pipeline, and the other end of the first channel is connected to the ventilation groove.

5. The rotary compressor according to claim 4, characterized in that: The projection of the ventilation groove on the cylinder is between the bearing hole of the upper cylinder head or the lower cylinder head and the exhaust hole of the upper cylinder head or the lower cylinder head.

6. The rotary compressor according to claim 5, characterized in that: The ventilation groove is an annular groove surrounding the bearing hole.

7. The rotary compressor according to claim 6, characterized in that: The farthest distance between the outer ring of the annular groove and the center of the bearing hole is not greater than the shortest distance between the outer ring of the rotor and the center of the bearing hole when the rotor rotates.

8. The rotary compressor according to claim 5, characterized in that: The ventilation groove is an arc-shaped groove, and the central angle corresponding to the arc-shaped groove at least covers the exhaust hole.

9. The rotary compressor according to claim 8, characterized in that: The central angle α corresponding to the arc groove satisfies 0≤α≤45°.

10. The rotary compressor according to claim 4, characterized in that: The ventilation groove is in the shape of a hole and is L-shaped after being connected with the first channel. The projection of the ventilation groove in the shape of a hole on the cylinder is located in the compression chamber of the cylinder.

11. The rotary compressor according to claim 10, characterized in that: The cylinder is provided with a vane groove, and the angle between the line connecting the center of the hole-shaped ventilation groove and the center of the bearing hole of the upper cylinder cover and the center line of the vane groove is β, and satisfies: 0≤β≤45°.

12. The rotary compressor according to any one of claims 1 to 11, characterized in that: A check valve is arranged in the exhaust pipe of the compressor body.

13. The rotary compressor according to claim 12, characterized in that: The check valve is a one-way solenoid valve.

14. An air conditioning system, characterized in that: It includes the rotary compressor and controller according to any one of claims 1 to 11, wherein 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 when the rotation speed of the rotary compressor is greater than or equal to a set reference value, controls the closing of the first valve to block the pipeline.

15. The air conditioning system according to claim 14, characterized in that: A check valve is arranged at the exhaust pipe of the compressor body.

16. A method for controlling an air conditioning system, characterized in that: Applicable to the air conditioning system of claim 15, the control method comprises the following steps: Get the status of the rotary compressor; If the rotary compressor is in a stopped state, the check valve is closed to block the exhaust pipe, and the first valve is opened to open the pipeline; If the rotary compressor is in operation, the check valve is opened to open the exhaust pipe. If the speed of the rotary compressor is greater than or equal to a set reference value, the first valve is closed to block the pipeline.

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