Pump body assembly, rotor compressor and air conditioner

Abstract

The utility model provides a pump body assembly, a rotor compressor and an air conditioner, the pump body assembly comprises an upper flange, an air cylinder group and a lower flange which are sequentially arranged from top to bottom, the air cylinder group comprises n air cylinders which are sequentially arranged from top to bottom, and a partition plate is arranged between every two adjacent air cylinders; the total displacement of the pump body assembly is within a certain value range, the sum of the heights of the n air cylinders is smaller than or equal to 21.6 mm, vibration of the compressor is reduced, the stability of low-frequency operation is guaranteed, and the compressor is prevented from being started and stopped frequently. The displacement of the compressor is improved, the energy efficiency of the compressor is optimized, the application range of the compressor is expanded, and the problems that in the prior art, a single-cylinder rotor compressor is large in vibration and unstable in low-frequency operation, consequently, the compressor is started and stopped frequently, and a double-cylinder rotor compressor is small in displacement and poor in energy efficiency are solved.

Description

Technical Field

[0001] This utility model belongs to the field of compressor technology, and in particular relates to a pump body assembly, a rotary compressor and an air conditioner. Background Technology

[0002] Rotary compressors are widely used in the field of air handling equipment due to their simple structure and low cost. However, existing single-cylinder rotary compressors have large vibrations and unstable low-frequency operation, which leads to frequency shielding and frequent compressor start-stop during low-frequency operation. Existing twin-cylinder rotary compressors have small displacement and poor energy efficiency, which limits their application. Utility Model Content

[0003] In view of this, the present invention provides a pump body assembly, a rotary compressor and an air conditioner to solve the problems of large vibration and unstable low-frequency operation of single-cylinder rotary compressors in the prior art, which lead to frequent compressor start-stop, and small displacement and poor energy efficiency of double-cylinder rotary compressors, which limit their application.

[0004] This utility model provides a pump body assembly for a rotary compressor; the total displacement of the pump body assembly is V, wherein V satisfies: 7.2cc≤V≤12.2cc;

[0005] The pump assembly includes a cylinder group, which comprises n cylinders arranged sequentially from top to bottom, with a partition between adjacent cylinders; the heights of the n cylinders are H1, H2, H3, ..., H... n And the heights of the n cylinders satisfy:

[0006] ∑H i ≤21.6mm;

[0007] Where n and i are both positive integers, and 2≤i≤n.

[0008] Further optionally, the inner diameters of the n cylinders are: D1, D2, D3, ..., D... n The total heat exchange area of ​​the inner walls of the n cylinders is S. w The S w satisfy:

[0009] S W =∑πD i H i ≤29.5cm 2 .

[0010] Further optionally, each of the cylinders is formed with a cavity; the pump body assembly further includes a crankshaft, the crankshaft including n eccentric shafts, the n eccentric shafts being rotatably disposed in the n cavities in a one-to-one correspondence, and each eccentric shaft being provided with a corresponding roller;

[0011] The radial thickness of any of the rollers is t i The eccentricity of the axis of any of the eccentric shafts relative to the rotation axis of the crankshaft is e. i The maximum sealing distance between any of the cavities and the adjacent partition is σ. i The t i e i and σ i satisfy:

[0012] σ i =t i -e i ≥1mm.

[0013] Further optionally, the displacement of any of the cylinders is v i The inner diameter of any one of the cylinders is D. i The height of any of the cylinders is H i ;

[0014] Each of the cylinders has a cavity; the pump assembly also includes a crankshaft, which comprises n eccentric shafts, each eccentric shaft being rotatably disposed within one of the n cavities, and each eccentric shaft having a corresponding roller; the eccentricity of the axis of any eccentric shaft relative to the rotation axis of the crankshaft is e. i ;

[0015] The v i D i H i and e i satisfy:

[0016]

[0017] Further optionally, the pump body assembly further includes an upper flange and a lower flange, with n cylinders disposed between the upper flange and the lower flange; the upper flange, the partition, the lower flange and the n cylinders are locked together by locking screws, and the locking threads that are threadedly connected to the locking screws are formed on one of the upper flange, the partition and the lower flange.

[0018] Further optionally, the upper flange also has an upper flange locking hole, the cylinder has a cylinder locking hole, the partition has a partition locking hole, the lower flange also has a lower flange locking hole, and one of the upper flange locking hole and the lower flange locking hole has a locking thread.

[0019] The locking screw includes a first locking screw, which passes through the upper flange locking hole, the cylinder locking hole, the partition locking hole, and the lower flange locking hole. The first locking screw is connected to the locking thread to achieve overall locking of the upper flange, the cylinder, the partition, and the lower flange.

[0020] Further optionally, n=2, the two cylinders are an upper cylinder and a lower cylinder respectively; the upper flange and the upper cylinder are positioned by an upper positioning screw, and the upper positioning thread that is threadedly connected to the upper positioning screw is formed on one of the upper flange and the upper cylinder;

[0021] The lower flange and the lower cylinder are positioned by a lower positioning screw, and the lower positioning thread that is threaded to the lower positioning screw is formed on one of the lower flange and the lower cylinder.

[0022] The present invention also provides a rotary compressor, the rotary compressor including a housing and a pump body assembly as described in any of the above claims; the housing has a mounting cavity, and the pump body assembly is disposed in the mounting cavity.

[0023] This utility model also provides an air conditioner, which includes the rotary compressor described above.

[0024] Compared with the prior art, the main advantages of this utility model are:

[0025] The total displacement of the pump body assembly is within a certain range; the pump body assembly includes n cylinders arranged sequentially from top to bottom, and the total height of the n cylinders is less than or equal to 21.6mm, which reduces compressor vibration, ensures stability during low-frequency operation, and prevents frequent compressor start-stop; it increases the total displacement of the compressor, optimizes the compressor's energy efficiency, expands the compressor's application range, and solves the problems of large vibration and unstable low-frequency operation of existing single-cylinder rotor compressors, which lead to frequent compressor start-stop, and the small displacement and poor energy efficiency of dual-cylinder rotor compressors. Attached Figure Description

[0026] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0028] Figure 1 and Figure 2 A schematic diagram of the structure of an embodiment of the rotary compressor provided by this utility model;

[0029] In the picture:

[0030] 11-Housing; 111-Mounting cavity; 12-Motor; 13-Upper cover; 14-Lower cover; 15-Base; 16-Gas-liquid separator; 17-Intake pipe; 18-Exhaust pipe;

[0031] 21-Upper flange; 22-Upper cylinder; 221-Upper cavity; 222-Upper cylinder intake port; 23-Baffle; 231-Air storage chamber; 24-Lower cylinder; 241-Lower cavity; 242-Lower cylinder intake port; 25-Lower flange; 26-Upper roller; 27-Lower roller;

[0032] 31 - Long axis; 32 - Upper eccentric axis; 33 - Middle axis; 34 - Lower eccentric axis; 35 - Short axis. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0034] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. The singular forms “a,” “said,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise; “multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0035] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0036] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0037] Existing single-cylinder rotary compressors have large vibrations and are unstable at low frequencies, resulting in frequency shielding and frequent compressor start-stop during low-frequency operation; existing double-cylinder rotary compressors have small displacement and poor energy efficiency, which limits their application.

[0038] This utility model creatively provides a pump body assembly for a rotary compressor; the total displacement of the pump body assembly is within a certain range; the pump body assembly includes n cylinders arranged sequentially from top to bottom, and the total height of the n cylinders is less than or equal to 21.6mm, which reduces compressor vibration, ensures stability during low-frequency operation, and prevents frequent compressor start-stop; it increases the total displacement of the compressor, optimizes the compressor's energy efficiency, and expands the compressor's application range.

[0039] like Figure 1 and Figure 2 As shown, this embodiment provides a pump body assembly for a rotary compressor. The pump body assembly includes an upper flange 21, a cylinder group, and a lower flange 25 arranged sequentially from top to bottom. The cylinder group includes n cylinders arranged sequentially from top to bottom, and a partition 23 is provided between two adjacent cylinders. Each cylinder forms a cavity and a slide groove communicating with the cavity. A rotatable roller is provided in each cavity, and a slidable slide plate is provided in the slide groove. One end of the slide plate abuts against the roller, and an elastic element is provided between the other end of the slide plate and the side wall of the slide groove. When the roller rotates, the slide plate can slide in the slide groove under the action of the roller and the elastic element, thereby enabling the cavity to achieve air intake and exhaust.

[0040] The total displacement of the pump assembly is V, which satisfies: 7.2cc ≤ V ≤ 12.2cc; the heights of the n cylinders are H1, H2, H3, ..., H... n And the heights of the n cylinders satisfy:

[0041] ∑H i ≤21.6mm;

[0042] Where n and i are both positive integers, and 2≤i≤n;

[0043] H nThe larger the cylinder height, the greater the leakage between the outer circumference of the roller and the inner circumference of the corresponding cylinder, affecting the compressor's energy efficiency. Currently, in small-displacement single-cylinder compressors, when the cylinder height is greater than 21.6mm, the cylinder height becomes a key parameter affecting the compressor's energy efficiency. If the cylinder height continues to increase, the compressor leakage will increase sharply, and the energy efficiency will decrease sharply. When using a dual-cylinder compressor or with more cylinders, the total leakage between the outer circumference of the roller and the inner circumference of the cylinder is the sum of the leakage of each cylinder. Therefore, it is necessary to control the total height of each cylinder to not exceed 21.6mm, otherwise the compressor's energy efficiency will decrease sharply.

[0044] The dimensions of the cylinders are related to the total heat exchange area of ​​the cylinders. The specific dimensions of the cylinders are further explained below; the inner diameters of the n cylinders are: D1, D2, D3, ..., D... n The total heat exchange area of ​​the inner walls of n cylinders is S. w S w satisfy:

[0045] S W =∑πD i H i ≤29.5cm 2 ;

[0046] During normal operation, the compressor casing and cylinder contain high-temperature, high-pressure refrigerant. The cylinder cavity is the compressor's working chamber. Regardless of whether the cavity is in a suction or compression state, heat exchange between the cylinder's exterior and interior affects the compressor's energy efficiency. Heating the suction chamber affects the compressor's suction volume, primarily impacting its volumetric efficiency, while heating the compression chamber affects its adiabatic efficiency. The cylinder's inner wall is the main heat exchange channel between the cylinder and the cavity; therefore, strictly controlling the total heat exchange area of ​​the cylinder's inner wall is crucial for efficient compressor operation.

[0047] The radial thickness of the roller, the eccentricity of the eccentric shaft, and the sealing distance between the cylinder and the partition 23 are related. This will be further explained below. The pump body assembly also includes a crankshaft, which includes a long shaft 31, an eccentric shaft, and a short shaft 35. There are n eccentric shafts, which are spaced apart in the extension direction of the crankshaft. The n eccentric shafts are rotatably arranged in n cavities, and each eccentric shaft is provided with a corresponding roller. When the crankshaft rotates, the eccentric shaft can rotate with the corresponding roller, thereby enabling the corresponding cavity to achieve air intake and exhaust.

[0048] The radial thickness of any roller is t i That is, the difference between the outer diameter and the inner diameter of the roller is the radial thickness of the roller; the eccentricity of the axis of any eccentric shaft relative to the axis of rotation of the crankshaft is e. i The maximum sealing distance between any cavity and the adjacent partition 23 is σ.i ;t i e i and σ i satisfy:

[0049] σ i =t i -e i ≥1mm.

[0050] The displacement of a cylinder is related to the eccentricity of the eccentric shaft, the height of the cylinder, and the inner diameter of the cylinder. This will be further explained below. The displacement of any cylinder is v. i The inner diameter of any cylinder is D. i The height of any cylinder is H i ;

[0051] v i D i H i and e i satisfy:

[0052]

[0053] When the eccentricity of the eccentric shaft is too small, the volume utilization coefficient of the cylinder will be small, affecting the energy efficiency of the compressor; at the same time, when the eccentricity of the eccentric shaft is too large, the compressor will be at risk of vane detachment at low frequencies.

[0054] Because the cylinder height is reduced, the mating distance between the locking screw and the cylinder is insufficient, which will affect the assembly reliability of the rotary compressor. By not placing the locking nut, which is threaded to the locking screw, on the cylinder, the cylinder height can be satisfied while ensuring the assembly reliability of the compressor; this will be further explained below.

[0055] The pump body assembly also includes an upper flange 21 and a lower flange 25, with n cylinders disposed between the upper flange 21 and the lower flange 25; the upper flange 21, the partition 23, the lower flange 25 and the n cylinders are locked together by locking screws, and the locking threads that are threadedly connected to the locking screws are formed on one of the upper flange 21, the partition 23 and the lower flange 25.

[0056] Specifically, the upper flange 21 also has an upper flange locking hole, the cylinder has a cylinder locking hole, the partition 23 has a partition locking hole, the lower flange 25 also has a lower flange locking hole, and one of the upper flange locking hole and the lower flange locking hole has a locking thread.

[0057] The locking screw includes a first locking screw, which passes through the upper flange locking hole, the cylinder locking hole, the partition locking hole and the lower flange locking hole. The first locking screw is connected to the locking thread to achieve overall locking of the upper flange 21, the cylinder, the partition 23 and the lower flange 25.

[0058] Reducing the number of locking screws connected to the cylinder thread reduces cylinder deformation when the pump body assembly is locked, lowers compressor power consumption and wear, reduces cylinder height, and improves compressor energy efficiency.

[0059] Taking n=2 as an example, the pump body assembly includes, from top to bottom, an upper flange 21, an upper cylinder 22, a partition 23, a lower cylinder 24, and a lower flange 25. The upper cylinder 22 forms an upper cavity 221 and an upper sliding groove communicating with the upper cavity 221. A rotatable upper roller 26 is provided in the upper cavity 221, and a slidable upper sliding plate is provided in the upper sliding groove. One end of the upper sliding plate abuts against the upper roller 26, and an upper elastic element is provided between the other end of the upper sliding plate and the side wall of the upper sliding groove. When the upper roller 26 rotates, under the action of the upper roller 26 and the upper elastic element... The upper sliding plate can slide in the upper sliding groove, thereby enabling the upper cavity 221 to achieve air intake and exhaust; the lower cylinder 24 forms a lower cavity 241 and a lower sliding groove communicating with the lower cavity 241. A rotatable lower roller 27 is provided in the lower cavity 241, and a slidable lower sliding plate is provided in the lower sliding groove; one end of the lower sliding plate abuts against the lower roller 27, and a lower elastic element is provided between the other end of the lower sliding plate and the side wall of the lower sliding groove; when the lower roller 27 rotates, under the action of the lower roller 27 and the lower elastic element, the lower sliding plate can slide in the lower sliding groove, thereby enabling the lower cavity 241 to achieve air intake and exhaust;

[0060] The location of the suction port of the pump body assembly affects the suction resistance and the power consumption of the compressor. The following is a further explanation of the location of the suction port: the upper cylinder 22 has an upper cylinder suction port 222, and the lower cylinder 24 has a lower cylinder suction port 242.

[0061] The partition 23 has an internal air storage chamber 231. The side wall of the partition 23 has an air intake hole, an upper air outlet hole, and a lower air outlet hole that communicate with the air storage chamber 231. The upper air outlet hole, the upper cylinder intake port 222, and the upper cavity 221 are connected. The lower air outlet hole, the lower cylinder intake port 242, and the lower cavity 241 are connected in sequence. Gas can enter the air storage chamber 231 through the partition air intake hole. A part of the gas in the air storage chamber 231 enters the upper cavity 221 through the upper air outlet hole and the upper cylinder intake port 222. Another part of the gas in the air storage chamber 231 enters the lower cavity 241 through the lower air outlet hole and the lower cylinder intake port 242.

[0062] The crankshaft includes a long shaft 31, an upper eccentric shaft 32, an intermediate shaft 33, a lower eccentric shaft 34, and a short shaft 35 arranged sequentially from top to bottom. The long shaft 31 and the upper flange hole are rotatably fitted by a main bearing, and the short shaft 35 and the lower flange hole are rotatably fitted by a secondary bearing. The upper eccentric shaft 32 is rotatably disposed in the upper cavity 221, and an upper roller 26 is disposed on the upper eccentric shaft 32. The lower eccentric shaft 34 is rotatably disposed in the lower cavity 241, and a lower roller 27 is disposed on the lower eccentric shaft 34. The intermediate shaft 33 is rotatably disposed in the partition hole. When the crankshaft is controlled to rotate, the upper eccentric shaft 32 rotates with the upper roller 26 in the upper cavity 221, and the upper cavity 221 realizes air intake and exhaust. The lower eccentric shaft 34 rotates with the lower roller 27 in the lower cavity 241, and the lower cavity 241 realizes air intake and exhaust.

[0063] In addition, the upper flange 21 and the upper cylinder 22 are positioned by upper positioning screws, and the upper positioning thread that is threaded to the upper positioning screws is formed on one of the upper flange 21 and the upper cylinder 22.

[0064] The lower flange 25 and the lower cylinder 24 are positioned by a lower positioning screw, and the lower positioning thread that is threaded to the lower positioning screw is formed on one of the lower flange 25 and the lower cylinder 24.

[0065] The number of screws connected to the upper cylinder 22 and the lower cylinder 24 is reduced, the deformation of the upper cylinder 22 and the lower cylinder 24 during pump body assembly positioning is reduced, the power consumption and wear of the compressor are reduced, the height of the upper cylinder 22 and the lower cylinder 24 is reduced, and the energy efficiency of the compressor is improved.

[0066] This embodiment also provides a rotary compressor, which includes a housing 11, a motor 12 and a pump assembly as described in any of the above embodiments; the housing 11 forms a mounting cavity 111, and the motor 12 and the pump assembly are disposed in the mounting cavity 111, with the motor 12 located above the pump assembly;

[0067] The motor 12 includes a rotor and a stator, and the rotor and the long shaft 31 are drivenly connected; the stator includes a stator core and a stator winding, the stator core is disposed on the side wall of the mounting cavity 111, and the stator winding is wound on the stator core; the rotor is rotatably disposed in the mounting cavity 111; the stator winding is energized by alternating current, which can make the rotor rotate.

[0068] The rotary compressor also includes an upper cover 13 and a lower cover 14. The upper cover 13 is located at the upper axial end of the housing 11, and the lower cover 14 is located at the lower axial end of the housing 11. The upper cover 13, the housing 11, and the lower cover 14 form a closed mounting cavity 111. A base 15 is provided at the lower end of the housing 11, and the rotary compressor is fixedly mounted through the base 15. An exhaust pipe 18 is provided on the upper cover 13, and the exhaust pipe 18 communicates with the mounting cavity 111.

[0069] A gas-liquid separator 16 is provided on one side of the rotary compressor, and the gas-liquid separator 16 forms a gas-liquid separator outlet; the baffle suction hole and the gas-liquid separator outlet are connected through a suction pipe 17.

[0070] When the upper cylinder 22 and the lower cylinder 24 are drawing in air, the gas in the gas-liquid separator 16 enters the gas storage chamber 231 through the intake pipe 17 and the intake hole of the partition plate; part of the gas in the gas storage chamber 231 enters the upper cavity 221 through the exhaust hole of the partition plate and the intake port 222 of the upper cylinder, and another part of the gas in the gas storage chamber 231 enters the lower cavity 241 through the lower exhaust hole of the partition plate and the intake port 242 of the lower cylinder; when the rotor drives the crankshaft to rotate, the upper eccentric shaft 32 drives the upper roller 26 to rotate, and the gas in the upper cavity 221 is discharged to the mounting cavity 111; the lower eccentric shaft 34 drives the lower roller 27 to rotate, and the gas in the lower cavity 241 is discharged to the mounting cavity 111; the gas in the mounting cavity 111 is discharged through the exhaust pipe 18.

[0071] This embodiment also provides an air conditioner, which includes the rotary compressor described above.

[0072] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A pump body assembly for a rotary compressor; characterized in that, The total displacement of the pump body assembly is V, and V satisfies: 7.2cc ≤ V ≤ 12.2cc; The pump assembly includes a cylinder group, which comprises n cylinders arranged sequentially from top to bottom, with a partition between adjacent cylinders; the heights of the n cylinders are H1, H2, H3, ..., H... n And the heights of the n cylinders satisfy: ∑H i ≤21.6mm; Where n and i are both positive integers, and 2≤i≤n.

2. The pump body assembly according to claim 1, characterized in that, The inner diameters of the n cylinders are: D1, D2, D3, ..., D n The total heat exchange area of ​​the inner walls of the n cylinders is S. w The S w satisfy: S W =∑πD i H i ≤29.5cm 2 。 3. The pump body assembly according to claim 1, characterized in that, Each of the cylinders is formed with a cavity; the pump body assembly also includes a crankshaft, the crankshaft including n eccentric shafts, the n eccentric shafts being rotatably disposed in the n cavities in a one-to-one correspondence, and each eccentric shaft being provided with a corresponding roller; The radial thickness of any of the rollers is t i The eccentricity of the axis of any of the eccentric shafts relative to the rotation axis of the crankshaft is e. i The maximum sealing distance between any of the cavities and the adjacent partition is σ. i The t i e i and σ i satisfy: σ i =t i -and i ≥1mm。 4. The pump body assembly according to claim 1, characterized in that, The displacement of any one of the cylinders is v i The inner diameter of any one of the cylinders is D. i The height of any of the cylinders is H i ; Each of the cylinders has a cavity; the pump assembly also includes a crankshaft, which comprises n eccentric shafts, each eccentric shaft being rotatably disposed within one of the n cavities, and each eccentric shaft having a corresponding roller; the eccentricity of the axis of any eccentric shaft relative to the rotation axis of the crankshaft is e. i ; The v i D i H i and e i satisfy:

5. The pump body assembly according to claim 1, characterized in that, The pump body assembly also includes an upper flange (21) and a lower flange (25), and n cylinders are provided between the upper flange (21) and the lower flange (25); the upper flange (21), the partition plate (23), the lower flange (25) and the n cylinders are locked together by locking screws, and the locking threads that are threadedly connected to the locking screws are formed on one of the upper flange (21), the partition plate (23) and the lower flange (25).

6. The pump body assembly according to claim 5, characterized in that, The upper flange (21) also has an upper flange locking hole, the cylinder has a cylinder locking hole, the partition (23) has a partition locking hole, the lower flange (25) also has a lower flange locking hole, and one of the upper flange locking hole and the lower flange locking hole has a locking thread. The locking screw includes a first locking screw, which passes through the upper flange locking hole, the cylinder locking hole, the partition locking hole and the lower flange locking hole. The first locking screw is connected to the locking thread to achieve overall locking of the upper flange (21), the cylinder, the partition (23) and the lower flange (25).

7. The pump body assembly according to claim 5, characterized in that, n=2, the two cylinders are an upper cylinder (22) and a lower cylinder (24); the upper flange (21) and the upper cylinder (22) are positioned by an upper positioning screw, and the upper positioning thread that is threaded to the upper positioning screw is formed on one of the upper flange (21) and the upper cylinder (22); The lower flange (25) and the lower cylinder (24) are positioned by a lower positioning screw, and the lower positioning thread that is threaded to the lower positioning screw is formed on one of the lower flange (25) and the lower cylinder (24).

8. A rotary compressor, characterized in that, The rotary compressor includes a housing and a pump assembly as described in any one of claims 1 to 7; the housing has a mounting cavity in which the pump assembly is disposed.

9. An air conditioner, characterized in that, The air conditioner includes the rotary compressor as described in claim 8.

Images