Rotary compressor

Abstract

A rotary compressor, comprising a housing (1), a cylinder (2), and a motor (3). The housing (1) is provided with an inner cavity (101); the cylinder (2) and the motor (3) are both provided in the inner cavity (101); the cylinder (2) is provided with a compression cavity (201); a piston (24) is provided in the compression cavity (201); a vane (25) penetrates through the cylinder (2) to extend into the compression cavity (201) and abut against the piston (24); the motor (3) comprises a stator (31), a rotor (32), and a crankshaft (33); the crankshaft (33) comprises a shaft portion (331) and an eccentric portion (332); the shaft portion (331) is fixed in the rotor (32); the eccentric portion (332) is inserted into the piston (24); and the outer diameter of the stator (31) ranges from 66 mm to 108 mm, the ratio from the height of the vane (25) to the outer diameter of the stator (31) ranges from 0.12 to 0.304, the ratio from the eccentricity of the crankshaft (33) to the outer diameter of the stator (31) ranges from 0.0105 to 0.0738, and the size of the stator (31) ranges from 81 cm3 to 522 cm3.

Description

Rotary compressor

[0001] This application claims priority to Chinese Patent Application No. 202410829864.8, filed on June 25, 2024, and Chinese Patent Application No. 202421466077.3, filed on June 25, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of compressors, for example to a rotary compressor. BACKGROUND

[0003] As a new type of compressor in recent years, the rotary compressor does not need to convert the rotary motion of the rotor into the reciprocating motion of the piston, but directly drives the piston to rotate to complete the compression of the refrigerant vapor. Since the piston rotates, the compression work is smooth and stable. In addition, the rotary compressor has no residual volume and no interference of re-expanding gas, so it has the advantages of high compression efficiency, fewer parts, small size, good balance, low noise, etc.

[0004] In the development process of rotary compressors, miniaturization is a trend. For the fixed-speed compressor in the field of heat pump clothes dryers and water heaters, there are still problems such as large size, heavy weight, and small cooling-to-weight ratio of the compressor body. Therefore, how to further reduce the size of the compressor, reduce the total weight, and increase the cooling-to-weight ratio of the compressor while ensuring the refrigeration effect of the compressor has become the direction of efforts of the technical personnel in the field.

[0005] SUMMARY

[0006] The present application provides a rotary compressor, which further reduces the size of the compressor, reduces the total weight, and effectively improves the cooling-to-weight ratio of the compressor while ensuring the refrigeration effect of the compressor.

[0007] The present application provides a rotary compressor, comprising:

[0008] A shell, which is cylindrical, has an inner cavity in the shell;

[0009] A cylinder is provided in the inner cavity, the cylinder has a compression chamber, the compression chamber is provided with a piston, the compression chamber is configured in a cylindrical shape and is coaxially arranged with the shell, the piston is configured in a cylindrical shape and is eccentrically arranged with the compression chamber, the upper and lower end faces of the piston are respectively attached to the inner cavity wall of the compression chamber at the corresponding end, a vane is provided in the cylinder and extends into the compression chamber and abuts against the outer side surface of the piston, the cylinder is provided with an air inlet and an air outlet which are communicated with the compression chamber;

[0010] The motor is arranged in the inner cavity and comprises a stator, a rotor and a crankshaft, the stator is sleeved on the rotor and fixed to the inner cavity, the crankshaft comprises a shaft part and an eccentric part, the shaft part is fixedly inserted into the rotor, and the eccentric part is inserted into the piston and arranged coaxially with the piston;

[0011] The outer diameter D1 of the stator ranges from 66 mm to 108 mm;

[0012] The ratio of the height h of the vane to the outer diameter D1 of the stator ranges from 0.12 to 0.304;

[0013] The ratio of the eccentricity e of the crankshaft to the outer diameter D1 of the stator ranges from 0.0105 to 0.0738;

[0014] The volume V of the stator ranges from 81 cm 3 -522 cm 3 .

[0015] In one or more embodiments, the cylinder comprises a cylinder body, an upper cylinder cover and a lower cylinder cover, the cylinder body is fixed in the inner cavity, the upper cylinder cover and the lower cylinder cover are respectively fixed to the upper and lower sides of the cylinder body, the upper cylinder cover, the cylinder body and the lower cylinder cover jointly enclose the compression cavity, one side of the piston is attached to the side wall of the cylinder body, the upper and lower end faces of the piston are respectively attached to the upper cylinder cover and the lower cylinder cover, the vane penetrates the cylinder body and extends into the compression cavity and abuts against the outer side of the piston, the air inlet is arranged on the side wall of the cylinder body, and the air outlet is arranged on the upper cylinder cover.

[0016] In one or more embodiments, the radius r of the shaft part ranges from 0 to 8 mm.

[0017] In one or more embodiments, the height of the piston is equal to the height of the vane, and the ratio of the height h of the piston to the radius of the piston ranges from 0.68 to 1.23.

[0018] In one or more embodiments, the area A of the air outlet ranges from 9.6 mm 2 .

[0019] In one or more embodiments, the arrangement thickness m of the air outlet in the axial direction of the shell ranges from 0 to 2.8 mm.

[0020] In one or more embodiments, the inner diameter of the stator is D2, the height of the stator is H, and the volume V of the stator is obtained by the following formula:

[0021] In one or more embodiments, the shell is fixedly provided with an air inlet pipe, which is communicated with the air inlet.

[0022] In one or more embodiments, the air inlet pipe is provided with a gas-liquid separator.

[0023] In one or more embodiments, the gas-liquid separator is fixedly connected with the shell by a fixing member. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a structural schematic view of a rotary compressor provided by the present application;

[0025] Fig. 2 is a partial structural schematic view of a cylinder provided by the present application;

[0026] Fig. 3 is a side sectional view of a cylinder part provided by the present application.

[0027] In the drawings: 1, shell; 101, inner cavity; 11, air inlet pipe; 12, fixing member; 2, cylinder; 201, compression chamber; 21, cylinder body; 211, air inlet; 22, upper cylinder cover; 221, air outlet; 23, lower cylinder cover; 24, piston; 25, vane; 3, motor; 31, stator; 32, rotor; 33, crankshaft; 331, shaft part; 332, eccentric part; 4, gas-liquid separator. DETAILED DESCRIPTION

[0028] The present application will be described in detail below in conjunction with the drawings and embodiments. The embodiments described herein are merely intended to explain the present application, but not to limit the present application. For the purpose of description, only parts related to the present application are shown in the drawings, but not all structures.

[0029] In the description of the present application, unless otherwise specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. The meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise specified and limited, the first feature is "on" or "under" the second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0031] In the description of the present embodiment, the terms "upper", "lower", "right", "left", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0032] The present embodiment provides a rotary compressor. Referring to FIGS. 1-3, the rotary compressor includes a shell 1, a cylinder 2 and a motor 3, wherein the shell 1 is cylindrical, and the shell 1 has an inner cavity 101 inside. The cylinder 2 is arranged in the inner cavity 101, and the cylinder 2 has a compression chamber 201, the compression chamber 201 is provided with a piston 24, the compression chamber 201 is configured in a cylindrical shape and arranged coaxially with the shell 1, the piston 24 is configured in a cylindrical shape and arranged eccentrically with the compression chamber 201, the upper and lower end faces of the piston 24 are respectively attached to the inner cavity wall of the compression chamber 201 at the corresponding end, a vane 25 is arranged through the cylinder 2 and extends into the compression chamber 201 and abuts against the outer side surface of the piston 24, and the cylinder 2 is provided with an air inlet 211 and an air outlet 221 which are communicated with the compression chamber 201. The motor 3 is arranged in the inner cavity 101 and includes a stator 31, a rotor 32 and a crankshaft 33, the stator 31 is sleeved on the rotor 32 and fixed to the inner cavity 101, and the crankshaft 33 includes a shaft portion 331 and an eccentric portion 332, the shaft portion 331 is fixedly inserted into the rotor 32, and the eccentric portion 332 is inserted into the piston 24 and arranged coaxially with the piston 24.

[0033] Exemplarily, the outer diameter D1 of the stator 31 is in the range of 66mm-108mm. The ratio of the height h of the vane 25 to the outer diameter D1 of the stator 31 is in the range of 0.12-0.304. The ratio of the eccentric amount e of the crankshaft 33 to the outer diameter D1 of the stator 31 is in the range of 0.0105-0.0738. The volume V of the stator 31 is in the range of 81cm 3 -522cm 3 .

[0034] In the embodiment, the combination of the numerical ranges of the above structure is applied to the rotary compressor, which can further reduce the size of the compressor, reduce the total weight, and effectively improve the cooling weight ratio of the compressor and the refrigerating capacity of the rotary compressor under the premise of ensuring the refrigerating effect of the rotary compressor.

[0035] Exemplarily, a set of experimental groups and control groups are provided below to describe the effect of the rotary compressor provided in the embodiment. Referring to the table, the outer diameter D1 of the stator 31 of the rotary compressor of the experimental group is 88 mm, the ratio of the height h of the vane 25 to the outer diameter D1 of the stator 31 is 0.170, the ratio of the eccentricity e of the crankshaft 33 to the outer diameter D1 of the stator 31 is 0.0424, and the volume V of the stator 31 is 350 cm 3 . The outer diameter D1 of the stator 31 of the rotary compressor of the control group is 112 mm, the ratio of the height h of the vane 25 to the outer diameter D1 of the stator 31 is 0.152, the ratio of the eccentricity e of the crankshaft 33 to the outer diameter D1 of the stator 31 is 0.026, and the volume V of the stator 31 is 445 cm 3 . The experimental results show that the weight of the rotary compressor of the experimental group is only 85.4% of that of the control group, but the two rotary compressors of the experimental group and the control group can achieve the same refrigeration coefficient (Coefficient Of Performance, COP) and the same refrigerating capacity, further reduce the size of the compressor, reduce the total weight, and effectively improve the cooling weight ratio of the compressor.

[0036] In the embodiment, the cylinder 2 includes a cylinder body 21, an upper cylinder cover 22, and a lower cylinder cover 23. The cylinder body 21 is fixed in the inner cavity 101. The upper cylinder cover 22 and the lower cylinder cover 23 are respectively fixed to the upper and lower sides of the cylinder body 21. The upper cylinder cover 22, the cylinder body 21, and the lower cylinder cover 23 jointly form a compression chamber 201. One side of the piston 24 is attached to the side wall of the cylinder body 21. The upper and lower end faces of the piston 24 are respectively attached to the upper cylinder cover 22 and the lower cylinder cover 23. The vane 25 extends into the compression chamber 201 through the cylinder body 21 and abuts against the outer side face of the piston 24. The intake port 211 is formed in the side wall of the cylinder body 21. The exhaust port 221 is formed in the upper cylinder cover 22.

[0037] Exemplarily, the lower end surface of the upper cylinder cover 22, the upper end surface of the lower cylinder cover 23 and the inner side wall of the cylinder body 21 jointly enclose the compression chamber 201. Exemplarily, the rotor 32 is rotationally connected to the stator 31. When the motor 3 operates, the rotor 32 rotates relative to the stator 31, thereby driving the crankshaft 33 to rotate, enabling the eccentric portion 332 to push against the piston 24 and drive the piston 24 to reciprocatingly roll on the inner side wall of the cylinder body 21, thereby realizing compression of the gas in the compression chamber 201. The upper end surface of the piston 24 is attached to the lower end surface of the upper cylinder cover 22, and the lower end surface of the piston 24 is attached to the upper end surface of the lower cylinder cover 23, thereby realizing reliable sealing between the piston 24 and the upper cylinder cover 22 and the lower cylinder cover 23.

[0038] In the embodiment, the inner diameter of the stator 31 is D2, the height of the stator 31 is H, and the volume V of the stator 31 can be obtained by the following formula:

[0039] In the embodiment, the radius r of the shaft portion 331 is in the range of r≤8mm. In the embodiment, the height of the piston 24, the height of the vane 25 and the height of the cylinder body 21 are equal. The ratio of the height h of the piston 24 to the radius of the piston 24 is in the range of 0.68-1.23.

[0040] In the embodiment, the area A of the exhaust port 221 is in the range of A≥9.6mm 2 The area corresponding to the area of the exhaust port 221 is indicated by A in FIG. 2.

[0041] In the embodiment, the opening thickness m of the exhaust port 221 in the axial direction of the shell 1 is in the range of m≤2.8mm.

[0042] In the embodiment, the shell 1 is fixedly provided with the intake pipe 11, and the intake pipe 11 communicates with the intake port 211.

[0043] In the embodiment, the intake pipe 11 is provided with the gas-liquid separator 4. The gas-liquid separator 4 can effectively avoid the direct entry of the refrigerant into the cylinder 2, avoid the generation of liquid impact, and ensure that only gas is sucked into the compression chamber 201 of the cylinder 2.

[0044] In the embodiment, the gas-liquid separator 4 is fixedly connected to the shell 1 by the fixing member 12. The fixing member 12 can further ensure the reliable fixation of the gas-liquid separator 4. Exemplarily, the fixing member 12 is a strap, and the shell 1 is fixedly provided with a connecting head, and the connecting head is provided with a fixing hole. The strap is wound around the shell 1 and passes through the fixing hole, thereby enabling the shell 1 to be bound to the connecting head, and thereby realizing the fixation between the gas-liquid separator 4 and the shell 1.

[0045] In summary, the rotary compressor provided in the embodiment further reduces the size of the compressor, reduces the total weight, effectively improves the cold weight ratio of the compressor, and improves the refrigeration capacity of the rotary compressor under the premise of ensuring the refrigeration effect of the compressor.

[0046] The rotary compressor provided in the application has the outer diameter D1 of the stator 31 in the range of 66mm-108mm, the ratio of the height h of the vane 25 to the outer diameter D1 of the stator 31 in the range of 0.12-0.304, the ratio of the eccentricity e of the crankshaft 33 to the outer diameter D1 of the stator 31 in the range of 0.0105-0.0738, and the volume V of the stator 31 in the range of 81cm 3 -522cm 3 The numerical range of the above structure is combined together and applied to the rotary compressor, which can further reduce the size of the compressor, reduce the total weight, effectively improve the cold weight ratio of the compressor, and effectively improve the refrigeration capacity of the rotary compressor under the premise of ensuring the refrigeration effect of the rotary compressor.

Claims

1. A rotary compressor, comprising: a shell (1) in a cylindrical shape, the shell (1) having an inner cavity (101) therein; a cylinder (2) arranged in the inner cavity (101), the cylinder (2) having a compression chamber (201) with a piston (24) arranged therein, the compression chamber (201) being configured in a cylindrical shape and arranged coaxially with the shell (1), the piston (24) being configured in a cylindrical shape and arranged eccentrically with the compression chamber (201), the upper and lower end faces of the piston (24) being respectively attached to the inner cavity walls of the compression chamber (201) at the corresponding ends, a vane (25) penetrating the cylinder (2) and extending into the compression chamber (201) and abutting against the outer side face of the piston (24), the cylinder (2) being provided with an air inlet (211) and an air outlet (221) communicating with the compression chamber (201); a motor (3) arranged in the inner cavity (101), comprising a stator (31), a rotor (32) and a crankshaft (33), the stator (31) being sleeved on the rotor (32) and fixed to the inner cavity (101), the crankshaft (33) comprising a shaft portion (331) and an eccentric portion (332), the shaft portion (331) being fixedly inserted into the rotor (32), the eccentric portion (332) being inserted into the piston (24) and arranged coaxially with the piston (24); the outer diameter D1 of the stator (31) ranges from 66mm to 108mm; the ratio of the height h of the vane (25) to the outer diameter D1 of the stator (31) ranges from 0.12 to 0.304; the ratio of the eccentricity e of the crankshaft (33) to the outer diameter D1 of the stator (31) ranges from 0.0105 to 0.0738; The volume V of the stator (31) ranges between 81 cm 3 - 522 cm 3 .

2. The rotary compressor of claim 1, wherein, the cylinder (2) comprises a cylinder body (21), an upper cylinder cover (22) and a lower cylinder cover (23), the cylinder body (21) being fixed to the inner cavity (101), the upper and lower cylinder covers (22, 23) being respectively fixed to the upper and lower sides of the cylinder body (21), the upper cylinder cover (22), the cylinder body (21) and the lower cylinder cover (23) collectively forming the compression chamber (201), one side of the piston (24) being attached to the side wall of the cylinder body (21), the upper and lower end faces of the piston (24) being respectively attached to the upper and lower cylinder covers (22, 23), the vane (25) penetrating the cylinder body (21) and extending into the compression chamber (201) and abutting against the outer side face of the piston (24), the air inlet (211) being arranged on the side wall of the cylinder body (21), and the air outlet (221) being arranged on the upper cylinder cover (22).

3. The rotary compressor of claim 1, wherein, the radius r of the shaft portion (331) ranges from 0mm to 8mm.

4. The rotary compressor of claim 1, wherein, the height of the piston (24) is equal to the height of the vane (25), and the ratio of the height h of the piston (24) to the radius of the piston (24) ranges from 0.68 to 1.

23.

5. The rotary compressor of claim 1, wherein, The area A of the exhaust port (221) is in the range of A≥9.6mm 2 .

6. The rotary compressor of claim 1, wherein, The opening thickness m of the exhaust port (221) in the axial direction of the shell (1) is in the range of m≤2.8mm.

7. The rotary compressor of claim 1, wherein, The inner diameter of the stator (31) is D2, the height of the stator (31) is H, and the volume V of the stator (31) is obtained by the following formula:

8. The rotary compressor of claim 1, wherein, An air inlet pipe (11) is fixedly arranged on the shell (1) and communicates with the air inlet (211).

9. The rotary compressor of claim 8, wherein, An air-liquid separator (4) is arranged on the air inlet pipe (11).

10. The rotary compressor of claim 9, wherein, The air-liquid separator (4) is fixedly connected with the shell (1) through a fixing member (12).

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