Rotor compressor

Abstract

The utility model provides a rotor compressor. The rotor compressor comprises a shell; the motor, the air cylinder and the crankshaft are contained in the shell, and the crankshaft transmits the rotating force of the motor to the piston, so that the piston rotates in the compression cavity to compress the refrigerant; the air supplementing pipeline is arranged in the component forming the compression cavity and comprises a radial pipe, an air supplementing hole and air supplementing grooves, the outer end of the radial pipe is exposed out of the outer surface of the air cylinder, the inner end of the radial pipe is connected with the air supplementing hole, the air supplementing hole is connected with at least one air supplementing groove, and the air supplementing grooves are communicated with the inner side of the air cylinder; and the gulp valve block is arranged in the gulp groove and is opened based on the air pressure difference between the two sides so as to carry out one-way gas supplementation into the air cylinder, and the ratio range of the depth of the gulp groove to the thickness of the peripheral component is 5%-35%. According to the rotor compressor, the proportion of the clearance volume in the working volume of the compressor can be effectively controlled, and the energy efficiency of the compressor is improved while timely air supply is ensured.

Description

Technical Field

[0001] The utility model relates to the field of refrigeration equipment, in particular to a rotary compressor. Background Art

[0002] The compressor is the core component of the refrigeration system, and the performance of the compressor determines the capacity of the refrigeration system.

[0003] When the ambient temperature of the compressor is low, the operating pressure of the compressor is relatively large, and the capacity / energy efficiency is seriously reduced. In order to improve the capacity / energy efficiency of the compressor, the jet air supply method is usually adopted. Jet air supply requires adding an air supply groove to the compressor components, and placing an air supply valve plate and an air supply limit plate in the air supply groove to control the opening and closing of the air supply channel. However, the addition of an air supply groove will also bring new clearance volume, thereby affecting the energy efficiency of the compressor. Reasonable control of the size of the air supply groove, and then control of the proportion of the clearance volume in the working volume of the compressor, can minimize the impact of the clearance volume while implementing air supply, thereby improving the energy efficiency of the compressor. However, if the volume of the air supply groove is simply reduced, it will inevitably limit the structure of the cross-sectional area of ​​the air supply channel, slowing down the air supply speed and reducing the timeliness of air supply.

[0004] Therefore, the utility model provides a rotor compressor. Utility Model Content

[0005] In response to the problems in the prior art, the purpose of the present utility model is to provide a rotor compressor that overcomes the difficulties of the prior art, can effectively control the proportion of the clearance volume in the working volume of the compressor, ensure timely air replenishment, and improve the energy efficiency of the compressor.

[0006] The utility model provides a rotor compressor, comprising:

[0007] case;

[0008] The motor, the cylinder and the crankshaft are accommodated in the housing, and the crankshaft transmits the rotational force of the motor to the piston, so that the piston rotates in the compression chamber to compress the refrigerant;

[0009] An air supply pipeline is arranged in the component forming the compression chamber, the air supply pipeline comprises a radial tube, an air supply hole and an air supply groove, the outer end of the radial tube is exposed on the outer surface of the component, the inner end is connected to the air supply hole, and the air supply hole is connected to at least one of the air supply grooves, and the air supply groove is connected to the inner cavity of the cylinder; and

[0010] The air supply valve plate is arranged in the air supply groove and is opened based on the air pressure difference on both sides to provide one-way air supply to the cylinder. The ratio between the depth of the air supply groove and the thickness of the peripheral component ranges from 5% to 35%.

[0011] Preferably, it also includes: an upper bearing assembly, an upper cylinder, an intermediate plate, a lower cylinder and a lower bearing assembly are stacked in sequence in the shell, the upper bearing assembly and the intermediate plate clamp the upper cylinder to form an upper compression chamber together, the lower bearing assembly and the intermediate plate clamp the lower cylinder to form a lower compression chamber together, and the air supply pipeline is formed inside one of the upper bearing assembly, the upper cylinder, the intermediate plate, the lower cylinder and the lower bearing assembly.

[0012] Preferably, the air supply groove is provided on the middle plate, and the ratio between the depth of the air supply groove and the thickness of the peripheral component is in a range of 10% to 30%.

[0013] Preferably, the radial tube is arranged on the side wall of the middle plate, the first end of the radial tube is connected to the external air supply passage, the second end is connected to the lower end of the air supply hole, and the upper end of the air supply hole is connected to the inner cavity of the upper cylinder.

[0014] Preferably, the first end of the air supply valve plate and the limit baffle are fixed to the mounting hole in the air supply groove through a fixing member, and the second end of the air supply valve plate covers the air supply hole to limit the opening angle of the second end of the air supply valve plate based on the air supply hole.

[0015] Preferably, the radial tube is arranged on the side wall of the middle plate, the first end of the radial tube is connected to the external air supply passage, and the second end is connected to the middle part of the air supply hole, the upper end and the lower end of the air supply hole are respectively provided with the air supply groove, and each of the air supply grooves is provided with an air supply valve plate, which can respectively connect the inner cavity of the upper cylinder and the inner cavity of the lower cylinder in a cutoff manner.

[0016] Preferably, it also includes:

[0017] Two pistons are rotatably disposed in the upper cylinder and the lower cylinder respectively;

[0018] The crankshaft has two eccentric parts. The crankshaft transmits the rotational force of the motor to the two pistons. The two eccentric parts respectively drive the two pistons to rotate in their respective cylinders to compress the refrigerant.

[0019] Preferably, the air supply hole is a pipeline, and the extension direction of the pipeline is parallel to the rotation axis direction of the motor.

[0020] Preferably, the air supply groove is provided in the upper cylinder and / or the lower cylinder, and the ratio between the depth of the air supply groove and the thickness of the peripheral component is in a range of 5% to 20%.

[0021] Preferably, the air-supplementing groove is provided on the upper bearing assembly and / or the lower bearing assembly, and the ratio between the depth of the air-supplementing groove and the thickness of the peripheral component is in a range of 15% to 35%.

[0022] In summary, the rotor compressor of the utility model can effectively control the proportion of the clearance volume in the working volume of the compressor, thereby improving the energy efficiency of the compressor while ensuring timely air replenishment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0024] Figure 1 It is a partial cross-sectional view of the first rotor compressor of the utility model.

[0025] Figure 2 for Figure 1 A partial enlarged view of the .

[0026] Figure 3 It is a cross-sectional view of a middle and upper cylinder of a rotary compressor of the utility model.

[0027] Figure 4 for Figure 3 Partial cross-sectional view along the AA axis.

[0028] Figure 5 It is a partial cross-sectional view of the second rotor compressor of the utility model.

[0029] Figure 6 for Figure 5 A partial enlarged view of the .

[0030] Figure 7 The figure is a trend chart of the ratio of the clearance volume to the working volume of the compressor at different ratios between the depth of the air supply groove and the thickness of the parts accommodating the air supply groove.

[0031] Figure 8 The figure is a trend chart of compressor energy efficiency (COP) at different ratios between the depth of the air supply groove and the thickness of the parts accommodating the air supply groove.

[0032] Reference numerals

[0033] 1 Upper bearing assembly

[0034] 2 Upper cylinder

[0035] 3 Middle plate

[0036] 31 Radial tube

[0037] 32 Air supply hole

[0038] 33 Air tank

[0039] 34 Mounting slots

[0040] 35 Mounting holes

[0041] 4 Lower cylinder

[0042] 5 Lower bearing assembly

[0043] 6 Air supply valve

[0044] 61 First End

[0045] 62 Second End

[0046] 63 Fixing parts DETAILED DESCRIPTION

[0047] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present application. The present application can also be implemented or applied through other different specific implementation methods, and the details in the present application can also be modified or changed in various ways according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0048] The following is a detailed description of the embodiments of the present application with reference to the accompanying drawings so that those skilled in the art can easily implement the present application. The present application can be embodied in a variety of different forms and is not limited to the embodiments described herein.

[0049] In the representations of the present application, the representations with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 the present application. Moreover, the represented specific features, structures, materials or characteristics 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 the different embodiments or examples represented in the present application and the features of the different embodiments or examples, unless they contradict each other.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In order to clearly describe the present application, components irrelevant to the description are omitted, and the same reference symbols are given to the same or similar components throughout the specification.

[0052] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0053] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.

[0054] 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 the existence of 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.

[0055] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present application. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0056] 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 application 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.

[0057] The utility model discloses a rotary compressor, comprising: a housing. A motor, a cylinder, and a crankshaft are contained in the housing. The crankshaft transmits the rotational force of the motor to the piston, so that the piston rotates in the compression chamber to compress the refrigerant. The air supply pipeline is arranged in the components forming the compression chamber (the components of the single-cylinder compression chamber include an upper cylinder head, a cylinder, and a lower cylinder head; the components of the multi-cylinder compression chamber include an upper cylinder head, a plurality of cylinders, an intermediate plate, a lower cylinder head, etc., so the air supply pipeline can be arbitrarily arranged in the above components according to the specific structure of the compressor), the air supply pipeline includes a radial tube 31, an air supply hole 32, and an air supply groove 33. One end of the radial tube 31 is connected to the external air supply passage, and the other end is connected to the air supply hole 32. The air supply hole 32 is connected to at least one air supply groove 33. The air supply groove 33 is connected to the inner cavity of the cylinder. The air supply groove 33 can be arranged on both sides of the components forming the compression chamber, or on any one of the upper and lower single sides. The air supply hole 32 supplies air to the inner cavity of the cylinder. The air supply valve plate 6 is arranged in the air supply groove 33, and is opened based on the air pressure difference on both sides to provide one-way air supply to the cylinder (the valve plate is opened when the air supply pressure is greater than the pressure in the compression chamber, and the valve plate is closed when the air supply pressure is less than the pressure in the compression chamber). The ratio between the depth of the air supply groove 33 and the thickness of the peripheral component is in the range of 5% to 35%. When the depth H1 of the air supply groove and the thickness H2 of the air supply groove component satisfy 5%≤H1 / H2≤35%, the ratio trend of the clearance volume brought by the air supply groove to the working volume of the compressor is as follows: Figure 7 As shown in Figure 2, the compressor energy efficiency trend is as follows: Figure 8 As shown, as the ratio of the depth H1 of the air supply groove to the thickness H2 of the air supply groove component increases, the clearance volume continues to increase, and the energy efficiency of the compressor gradually decreases; as the ratio of the depth H1 of the air supply groove to the thickness H2 of the air supply groove component decreases, the clearance volume continues to decrease, and the energy efficiency of the compressor gradually increases. The rotary compressor of the utility model can effectively control the proportion of the clearance volume in the working volume of the compressor, while ensuring timely air supply, improving the energy efficiency of the compressor. Moreover, in the specific structure, the air supply pipeline can be arranged on different components such as the cylinder and cylinder head (including the middle plate) that form the compression chamber, and the corresponding thickness ratio will also change, so as to take into account the two dimensions of timeliness of air supply and compressor energy efficiency, and improve the overall operating performance of the compressor.

[0058] In a preferred embodiment, it also includes: an upper bearing assembly 1, an upper cylinder 2, an intermediate plate 3, a lower cylinder 4 and a lower bearing assembly 5 which are stacked in sequence in the shell, the upper bearing assembly 1 and the intermediate plate 3 clamp the upper cylinder 2 to jointly form an upper compression chamber, the lower bearing assembly 5 and the intermediate plate 3 clamp the lower cylinder 4 to jointly form a lower compression chamber, and an air supply pipeline is formed inside one of the upper bearing assembly 1, the upper cylinder 2, the intermediate plate 3, the lower cylinder 4 and the lower bearing assembly 5, but is not limited to this.

[0059] In a preferred embodiment, the air supply groove 33 is disposed on the middle plate 3 , and the ratio of the depth of the air supply groove 33 to the thickness of the peripheral component is in a range of 10% to 30%, but not limited thereto.

[0060] In a preferred embodiment, the radial tube 31 is arranged on the side wall of the middle plate 3, the first end of the radial tube 31 is connected to the external air supply passage, the second end is connected to the lower end of the air supply hole 32, and the upper end of the air supply hole 32 is connected to the inner cavity of the upper cylinder 2, but not limited to this.

[0061] In a preferred embodiment, the first end 61 of the air supply valve plate 6 and the limit baffle are fixed to the mounting hole 35 in the air supply groove 33 by a fixing member 63 (the fixing member 63 can be screwed or riveted), and the second end 62 of the air supply valve plate 6 covers the air supply hole 32 to limit the opening angle of the second end 62 of the air supply valve plate 6 based on the air supply hole 32, but is not limited to this.

[0062] In a preferred embodiment, the radial tube 31 is arranged on the side wall of the middle plate 3, the first end of the radial tube 31 is connected to the external air supply passage, and the second end is connected to the middle of the air supply hole 32, and the upper and lower ends of the air supply hole 32 are respectively provided with air supply grooves 33, and each air supply groove 33 is provided with an air supply valve plate 6, which can respectively connect the inner cavity of the upper cylinder 2 and the inner cavity of the lower cylinder 4 in a cutoff manner, but not limited to this.

[0063] In a preferred embodiment, it also includes:

[0064] Two pistons are rotatably disposed in the upper cylinder 2 and the lower cylinder 4 respectively;

[0065] The crankshaft has two eccentric parts. The crankshaft transmits the rotational force of the motor to the two pistons. The two eccentric parts respectively drive the two pistons to rotate in their respective cylinders to compress the refrigerant, but not limited to this.

[0066] In a preferred embodiment, the air supply hole 32 is a pipeline, and the extension direction of the pipeline is parallel to the rotation axis direction of the motor, but not limited thereto.

[0067] In a preferred embodiment, the air supplement groove 33 is disposed in the upper cylinder and / or the lower cylinder, and the ratio of the depth of the air supplement groove 33 to the thickness of the peripheral component is in a range of 5% to 20%, but not limited thereto.

[0068] In a preferred embodiment, the air supplement groove 33 is disposed in the upper bearing assembly 1 and / or the lower bearing assembly 5, and the ratio between the depth of the air supplement groove 33 and the thickness of the peripheral component is in a range of 15% to 35%, but not limited thereto.

[0069] Figure 1 It is a partial cross-sectional view of the first rotor compressor of the utility model. Figure 2 for Figure 1A partial enlarged view of the . Figure 3 It is a cross-sectional view of a middle and upper cylinder of a rotary compressor of the utility model. Figure 4 for Figure 3 A partial cross-sectional view along the AA axis. Figures 1 to 4 As shown, the first rotary compressor of the utility model (hereinafter, a double-cylinder rotary compressor is used as an example for explanation, but not limited thereto) comprises: a housing, a motor, a double cylinder, a crankshaft, an air supply pipeline and an air supply valve plate 6. The upper bearing assembly 1, the upper cylinder 2, the middle plate 3, the lower cylinder 4 and the lower bearing assembly 5 are stacked in sequence in the housing, the upper bearing assembly 1 and the middle plate 3 clamp the upper cylinder 2 to form an upper compression chamber together, the lower bearing assembly 5 and the middle plate 3 clamp the lower cylinder 4 to form a lower compression chamber together, and the air supply pipeline is formed inside one of the upper bearing assembly 1, the upper cylinder 2, the middle plate 3, the lower cylinder 4 and the lower bearing assembly 5. The motor is accommodated in the housing. Two pistons are rotatably arranged in the upper cylinder 2 and the lower cylinder 4 respectively. The crankshaft has two eccentric parts, and the crankshaft transmits the rotational force of the motor to the two pistons. The two eccentric parts respectively drive the two pistons to rotate in their respective cylinders to compress the refrigerant. The air supply pipeline is arranged on the side wall of the middle plate, and the air supply pipeline includes a radial tube 31, an air supply hole 32 and an air supply groove 33. The outer end of the radial tube 31 is exposed on the outer surface of the middle plate, and the inner end is connected to the air supply hole 32, and the air supply hole 32 is connected to at least one air supply groove 33, and the air supply groove 33 is connected to the inner cavity of the cylinder. The air supply hole 32 is a pipeline, and the extension direction of the pipeline is parallel to the rotation axis direction of the motor. The air supply valve plate 6 is arranged in the air supply groove 33, and is opened based on the air pressure difference on both sides to perform one-way air supply to the cylinder. The ratio between the depth of the air supply groove 33 and the thickness of the peripheral component is in the range of 5% to 35%. Among them, when the air supply groove 33 is arranged on the middle plate 3, it is preferred that the ratio between the depth of the air supply groove 33 and the thickness of the peripheral component is in the range of 10% to 30%. The radial tube 31 is arranged on the side wall of the middle plate 3, the first end of the radial tube 31 is connected to the external air supply passage, the second end is connected to the lower end of the air supply hole 32, and the upper end of the air supply hole 32 is connected to the inner cavity of the upper cylinder 2. The first end 61 of the air supply valve plate 6 and the limit baffle are fixed to the mounting hole 35 in the air supply groove 33 by the fixing member 63 (the fixing member 63 can be screwed or riveted) and the second end 62 of the air supply valve plate 6 covers the air supply hole 32 to limit the opening angle of the second end 62 of the air supply valve plate 6 based on the air supply hole 32. When the jet airflow flows from the middle plate 3 to the air supply valve plate 6 at one end, the airflow is discharged from the air supply valve plate 6, enters the airflow channel connecting the air supply groove 33 and the inner cavity of the upper cylinder 2, and enters the compression chamber of the upper cylinder 2 from the small hole channel.

[0070] Figure 5 It is a partial cross-sectional view of the second rotor compressor of the utility model. Figure 6 for Figure 5 A partial enlarged view of the Figure 5 and6 As shown, the second type of rotary compressor of the utility model is different from the first type of rotary compressor in that the second type of rotary compressor is a double-sided air supply groove structure. The radial tube 31 is arranged on the side wall of the middle plate 3, the first end of the radial tube 31 is connected to the external air supply passage, and the second end is connected to the middle of the air supply hole 32. The upper end and the lower end of the air supply hole 32 are respectively provided with air supply grooves 33, and each air supply groove 33 is provided with an air supply valve plate 6, which can be cut off and connected to the inner cavity of the upper cylinder 2 and the inner cavity of the lower cylinder 4. The two air supply grooves 33 are respectively arranged on the upper surface and the lower surface of the middle plate 3, and the ratio between the depth H1 of each air supply groove 33 and the overall thickness H2 of the middle plate 3 is in the range of 10% to 30%, but not limited thereto. When the jet air flows from the middle plate 3 to the air supply valve plates 6 at the upper and lower ends, the air flow is discharged from the air supply valve plates 6, enters the air supply groove 22 and the air flow channel connected to the upper and lower cylinders, and enters the compression chambers of the upper cylinder 2 and the lower cylinder 4 respectively from the small hole channels, so that the upper and lower cylinders can be replenished with air at the same time or any cylinder that needs air replenishment can be replenished with air independently.

[0071] In a variation, the air supply pipeline can be arranged on the cylinder wall forming the compression chamber. For example, the air supply groove 33 is arranged on the upper cylinder 2 and / or the lower cylinder 4. The ratio between the depth H1 of the air supply groove 33 and the thickness of the cylinder wall is preferably in the range of 5% to 20%, so as to meet the balance between timely air supply and compressor energy efficiency under this structure and comprehensively improve the performance of the whole machine. The remaining technical features will not be repeated here.

[0072] In another variation, the air supply pipeline can be arranged on the cylinder head that forms the compression chamber. For example, the air supply groove 33 is arranged on the upper bearing assembly 1 and / or the lower bearing assembly 5. The ratio between the depth H1 of the air supply groove 33 and the thickness of the cylinder head is preferably in the range of 15% to 35%, so as to meet the balance between timely air supply and compressor energy efficiency under this structure and comprehensively improve the performance of the whole machine. The remaining technical features will not be repeated here.

[0073] In summary, the rotor compressor of the utility model can effectively control the proportion of the clearance volume in the working volume of the compressor, thereby improving the energy efficiency of the compressor while ensuring timely air replenishment.

[0074] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A rotary compressor, characterized in that: include: case; The motor, the cylinder and the crankshaft are accommodated in the housing, and the crankshaft transmits the rotational force of the motor to the piston, so that the piston rotates in the compression chamber to compress the refrigerant; an air supply pipeline, arranged in a component forming the compression chamber, the air supply pipeline comprising a radial tube (31), an air supply hole (32) and an air supply groove (33), the outer end of the radial tube (31) is exposed on the outer surface of the component, the inner end is connected to the air supply hole (32), and the air supply hole (32) is connected to at least one of the air supply grooves (33), and the air supply groove (33) is connected to the inner cavity of the cylinder; and The air supply valve plate (6) is arranged in the air supply groove (33) and is opened based on the air pressure difference on both sides to provide one-way air supply to the cylinder. The ratio between the depth of the air supply groove (33) and the thickness of the peripheral component ranges from 5% to 35%.

2. The rotary compressor according to claim 1, characterized in that: Also includes: An upper bearing assembly (1), an upper cylinder (2), an intermediate plate (3), a lower cylinder (4) and a lower bearing assembly (5) are stacked in sequence in the housing; the upper bearing assembly (1) and the intermediate plate (3) clamp the upper cylinder (2) to form an upper compression chamber; the lower bearing assembly (5) and the intermediate plate (3) clamp the lower cylinder (4) to form a lower compression chamber; and the air supply pipeline is formed inside one of the upper bearing assembly (1), the upper cylinder (2), the intermediate plate (3), the lower cylinder (4) and the lower bearing assembly (5).

3. The rotary compressor according to claim 2, characterized in that: The air supply groove (33) is arranged on the middle plate (3), and the ratio between the depth of the air supply groove (33) and the thickness of the peripheral component is in the range of 10% to 30%.

4. The rotary compressor according to claim 3, characterized in that: The radial tube (31) is arranged on the side wall of the middle plate (3), the first end of the radial tube (31) is connected to the external air supply passage, the second end is connected to the lower end of the air supply hole (32), and the upper end of the air supply hole (32) is connected to the inner cavity of the upper cylinder (2).

5. The rotary compressor according to claim 2, characterized in that: The first end (61) of the air supply valve plate (6) and the limit baffle are fixed to the mounting hole (35) in the air supply groove (33) through a fixing member (63), and the second end (62) of the air supply valve plate (6) covers the air supply hole (32) to limit the opening angle of the second end (62) of the air supply valve plate (6) based on the air supply hole (32).

6. The rotary compressor according to claim 3, characterized in that: The radial tube (31) is arranged on the side wall of the middle plate (3), the first end of the radial tube (31) is connected to the external air supply passage, and the second end is connected to the middle part of the air supply hole (32), the upper end and the lower end of the air supply hole (32) are respectively provided with the air supply groove (33), and each of the air supply grooves (33) is provided with an air supply valve plate (6), which can be respectively connected to the inner cavity of the upper cylinder (2) and the inner cavity of the lower cylinder (4) in a cut-off manner.

7. The rotary compressor according to claim 2, characterized in that: Also includes: Two pistons are rotatably disposed in the upper cylinder (2) and the lower cylinder (4) respectively; The crankshaft has two eccentric parts. The crankshaft transmits the rotational force of the motor to the two pistons. The two eccentric parts respectively drive the two pistons to rotate in their respective cylinders to compress the refrigerant.

8. The rotary compressor according to claim 7, characterized in that: The air supply hole (32) is a pipeline, and the extension direction of the pipeline is parallel to the rotation axis direction of the motor.

9. The rotary compressor according to claim 2, characterized in that: The air supply groove (33) is arranged on the upper cylinder (2) and / or the lower cylinder (4), and the ratio between the depth of the air supply groove (33) and the thickness of the peripheral component is in the range of 5% to 20%.

10. The rotary compressor according to claim 2, characterized in that: The air-supplementing groove (33) is arranged on the upper bearing assembly (1) and / or the lower bearing assembly (5), and the ratio between the depth of the air-supplementing groove (33) and the thickness of the peripheral component is in the range of 15% to 35%.

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