Rotary compressor

Abstract

The utility model belongs to the technical field of compressors, and discloses a rotary compressor which comprises a shell, an air cylinder and a motor, the shell is provided with an inner cavity, the air cylinder and the motor are both arranged in the inner cavity, the air cylinder is provided with a compression cavity, a piston is arranged in the compression cavity, blades penetrate through the air cylinder, stretch into the compression cavity and abut against the piston, and the motor comprises a stator, a rotor and a crankshaft. The crankshaft comprises a shaft part and an eccentric part, the shaft part is fixed in the rotor, and the eccentric part is inserted into the piston; the value range of the outer diameter of the stator is 66-108 mm, the value range of the ratio of the height of the blades to the outer diameter of the stator is 0.12-0.304, the value range of the ratio of the eccentricity of the crankshaft to the outer diameter of the stator is 0.0105-0.0738, and the value range of the volume of the stator is 81-522 cm < 3 >. On the premise that the refrigeration effect of the compressor is guaranteed, the size of the compressor is further reduced, the total weight is reduced, and the cold-to-weight ratio of the compressor is effectively increased.

Description

Technical Field

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

[0002] As a new type of compressor in recent years, the motor of 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, thereby completing the compression of the refrigerator steam. Since the piston rotates, the compression work is smooth and stable. In addition, the rotary compressor has no clearance volume and no interference from the re-expansion gas, so it has the advantages of high compression efficiency, few parts, small size, good balance, and low noise.

[0003] In the development process of rotary compressors, miniaturization is a trend. For fixed-speed compressors in the field of heat pump dryers and water heaters, there are still problems such as large compressor body size, heavy weight, and small cooling-to-weight ratio. Therefore, how to further reduce the size of the compressor, reduce the total weight, and increase the cooling-to-weight ratio while ensuring the refrigeration effect of the compressor has become the current direction of efforts of technicians in this field. Utility Model Content

[0004] The utility model aims to provide a rotary compressor, which can further reduce the size of the compressor, reduce the total weight and effectively improve the cooling-to-weight ratio of the compressor while ensuring the refrigeration effect of the compressor.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A rotary compressor, comprising:

[0007] A shell, the shell is cylindrical and has an inner cavity;

[0008] A cylinder is arranged in the inner cavity, the cylinder has a compression cavity, a piston is arranged in the compression cavity, the compression cavity is configured as a cylinder and is coaxially arranged with the outer shell, the piston is configured as a cylinder and is eccentrically arranged with the compression cavity, the upper and lower end surfaces of the piston are respectively attached to the inner cavity wall of the compression cavity at the corresponding ends, the blades penetrate the cylinder and extend into the compression cavity and abut against the outer side surface of the piston, and the cylinder is provided with an air inlet and an air outlet connected to the compression cavity;

[0009] A motor is disposed in the inner cavity, comprising a stator, a rotor and a crankshaft, wherein the stator is sleeved on the rotor and fixed to the inner cavity, and the crankshaft comprises a shaft portion and an eccentric portion, wherein the shaft portion is fixedly inserted into the rotor, and the eccentric portion is inserted into the piston and arranged coaxially with the piston;

[0010] The outer diameter D1 of the stator has a value range of 66 mm to 108 mm;

[0011] The ratio of the height h of the blade to the outer diameter D1 of the stator is in the range of 0.12-0.304;

[0012] The ratio of the eccentricity e of the crankshaft to the outer diameter D1 of the stator is in the range of 0.0105-0.0738;

[0013] The volume V of the stator ranges from 81cm 3 -522cm 3 .

[0014] Preferably, the cylinder comprises a cylinder body, an upper cylinder head and a lower cylinder head, the cylinder body is fixed in the inner cavity, the upper cylinder head and the lower cylinder head are respectively fixed to the upper and lower sides of the cylinder body, the upper cylinder head, the cylinder body and the lower cylinder head together enclose the compression chamber, one side of the piston is attached to the side wall of the cylinder body, the upper and lower end surfaces of the piston are respectively attached to the upper cylinder head and the lower cylinder head, the blades penetrate the cylinder body and extend into the compression chamber and abut against the outer side surface of the piston, the air inlet is opened on the side wall of the cylinder body, and the exhaust port is opened on the upper cylinder head.

[0015] Preferably, the radius r of the shaft portion has a value range of r≤8 mm.

[0016] Preferably, the height of the piston is equal to the height of the blade, and the ratio of the height h of the piston to the radius of the piston is in the range of 0.68-1.23.

[0017] Preferably, the area A of the exhaust port is in the range of: A ≥ 9.6 mm 2 .

[0018] Preferably, a thickness m of the exhaust port along the axial direction of the shell has a value range of m≤2.8 mm.

[0019] Preferably, 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:

[0020] Preferably, an air intake pipe is fixedly provided on the outer shell, and the air intake pipe is connected to the air inlet.

[0021] Preferably, a gas-liquid separator is provided on the air inlet pipe.

[0022] Preferably, the gas-liquid separator is fixedly connected to the housing via a fixing member.

[0023] Beneficial effects:

[0024] The rotary compressor provided by the utility model has a stator outer diameter D1 in the range of 66 mm to 108 mm, a blade height h and a ratio of the stator outer diameter D1 in the range of 0.12 to 0.304, a crankshaft eccentricity e and a ratio of the stator outer diameter D1 in the range of 0.0105 to 0.0738, and a stator volume V in the range of 81 cm 3 -522cm 3 The ratio combination of the numerical range of the above structure is applied to the rotary compressor together. Under the premise of ensuring the refrigeration effect of the rotary compressor, it can further reduce the size of the compressor, reduce the total weight, and effectively improve the cooling-to-weight ratio of the compressor, thereby effectively improving the refrigeration capacity of the rotary compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the rotary compressor provided by the utility model;

[0026] Figure 2 It is a partial structural schematic diagram of the cylinder provided by the utility model;

[0027] Figure 3 It is a side sectional view of the cylinder part provided by the utility model.

[0028] In the figure:

[0029] 1. Shell; 101. Inner cavity; 11. Air inlet pipe; 12. Fixing parts;

[0030] 2. Cylinder; 201. Compression chamber; 21. Cylinder body; 211. Air inlet; 22. Upper cylinder head; 221. Exhaust port; 23. Lower cylinder head; 24. Piston; 25. Blade;

[0031] 3. Motor; 31. Stator; 32. Rotor; 33. Crankshaft; 331. Shaft; 332. Eccentric part;

[0032] 4. Gas-liquid separator. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] This embodiment provides a rotary compressor. Figures 1 to 3 As shown, the rotary compressor includes a shell 1, a cylinder 2 and a motor 3, wherein the shell 1 is cylindrical and has an inner cavity 101. The cylinder 2 is arranged in the inner cavity 101, and has a compression chamber 201. A piston 24 is arranged in the compression chamber 201. The compression chamber 201 is configured in a cylindrical shape and is coaxially arranged with the shell 1. The piston 24 is configured in a cylindrical shape and is eccentrically arranged with the compression chamber 201. The upper and lower end surfaces of the piston 24 are respectively attached to the inner cavity 101 wall of the compression chamber 201 at the corresponding ends. The blade 25 penetrates the cylinder 2 and extends into the compression chamber 201 and abuts against the outer side surface of the piston 24. The cylinder 2 is provided with an air inlet 211 and an air outlet 221 connected to 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. The crankshaft 33 includes a shaft portion 331 and an eccentric portion 332. The shaft portion 331 is fixedly inserted in the rotor 32, and the eccentric portion 332 is inserted into the piston 24 and is arranged coaxially with the piston 24.

[0038] Specifically, the outer diameter D1 of the stator 31 is in the range of 66 mm to 108 mm. The ratio of the height h of the blade 25 to the outer diameter D1 of the stator 31 is in the range of 0.12 to 0.304. The ratio of the eccentricity e of the crankshaft 33 to the outer diameter D1 of the stator 31 is in the range of 0.0105 to 0.0738. The volume V of the stator 31 is in the range of 81 cm 3 -522cm 3 .

[0039] In this embodiment, the ratio combination of the numerical range of the above-mentioned structure is jointly applied to the rotary compressor, which can further reduce the size of the compressor, reduce the total weight, and effectively improve the cooling-to-weight ratio of the compressor while ensuring the refrigeration effect of the rotary compressor, thereby effectively improving the refrigeration capacity of the rotary compressor.

[0040] As an example, a set of experimental groups and control groups are provided below to describe the beneficial effects of the rotary compressor provided by this embodiment. Specifically, referring to the table below, 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 blade 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 blade 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 experiment shows that the weight of the rotary compressor provided by 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 COP (Coefficient Of Performance), exert the same refrigeration capacity, further reduce the size of the compressor, reduce the total weight, and effectively improve the cooling-to-weight ratio of the compressor.

[0041]

[0042] In this embodiment, the cylinder 2 includes a cylinder body 21, an upper cylinder head 22 and a lower cylinder head 23. The cylinder body 21 is fixed in the inner cavity 101. The upper cylinder head 22 and the lower cylinder head 23 are respectively fixed on the upper and lower sides of the cylinder body 21. The upper cylinder head 22, the cylinder body 21 and the lower cylinder head 23 together enclose 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 surfaces of the piston 24 are respectively attached to the upper cylinder head 22 and the lower cylinder head 23. The blade 25 penetrates the cylinder body 21 and extends into the compression chamber 201 and abuts against the outer side surface of the piston 24. The air inlet 211 is opened on the side wall of the cylinder body 21, and the exhaust port 221 is opened on the upper cylinder head 22.

[0043] Specifically, the lower end surface of the upper cylinder head 22, the upper end surface of the lower cylinder head 23 and the inner side wall of the cylinder body 21 together enclose the compression chamber 201. Specifically, the rotor 32 is rotatably connected to the stator 31. When the motor 3 is working, the rotor 32 rotates relative to the stator 31, thereby driving the crankshaft 33 to rotate, so that the eccentric part 332 rotates to push against the piston 24, driving the piston 24 to roll back and forth on the inner side wall of the cylinder body 21, thereby achieving 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 head 22, and the lower end surface of the piston 24 is attached to the upper end surface of the lower cylinder head 23, thereby achieving reliable sealing between the piston 24 and the upper cylinder head 22 and the lower cylinder head 23.

[0044] In this 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:

[0045] In this embodiment, the radius r of the shaft portion 331 is in the range of r≤8 mm. In this embodiment, the height of the piston 24, the height of the blade 25 and the height of the cylinder 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.

[0046] In this embodiment, the area A of the exhaust port 221 has a range of: A ≥ 9.6 mm 2 . Figure 2 The area indicated by A is the area corresponding to the area of ​​the exhaust port 221.

[0047] In this embodiment, the thickness m of the exhaust port 221 along the axial direction of the housing 1 is in the range of m≤2.8 mm.

[0048] In this embodiment, an air inlet pipe 11 is fixedly disposed on the housing 1 , and the air inlet pipe 11 is connected to the air inlet port 211 .

[0049] In this embodiment, a gas-liquid separator 4 is provided on the air inlet pipe 11. The provision of the gas-liquid separator 4 can effectively prevent the refrigerant liquid from directly entering the cylinder 2, avoid the occurrence of liquid hammer, and ensure that the compression chamber 201 sucked into the cylinder 2 is gas.

[0050] In this embodiment, the gas-liquid separator 4 is fixedly connected to the housing 1 through a fixing member 12. By providing the fixing member 12, the gas-liquid separator 4 can be further reliably fixed. Exemplarily, the fixing member 12 is configured as a binding band, and a connector is fixedly provided on the housing 1, and the connector is provided with a fixing through hole. The binding band is wound around the housing 1 and penetrates the fixing through hole, so that the housing can be bound to the connector, thereby achieving the fixation between the gas-liquid separator 4 and the housing 1.

[0051] In summary, the rotary compressor provided in this embodiment further reduces the size of the compressor and reduces the total weight while ensuring the refrigeration effect of the compressor, thereby effectively improving the cooling-to-weight ratio of the compressor and enhancing the refrigeration capacity of the rotary compressor.

[0052] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A rotary compressor, characterized in that: include: A housing (1), the housing (1) being cylindrical and having an inner cavity (101); A cylinder (2) is arranged in the inner cavity (101), the cylinder (2) has a compression cavity (201), a piston (24) is arranged in the compression cavity (201), the compression cavity (201) is configured in a cylindrical shape and is arranged coaxially with the outer shell (1), the piston (24) is configured in a cylindrical shape and is arranged eccentrically with the compression cavity (201), the upper and lower end surfaces of the piston (24) are respectively attached to the inner cavity wall of the compression cavity (201) at the corresponding ends, the blade (25) penetrates the cylinder (2) and extends into the compression cavity (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 connected to the compression cavity (201); The motor (3) is arranged in the inner cavity (101), and comprises 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); the crankshaft (33) comprises a shaft portion (331) and an eccentric portion (332); the shaft portion (331) is fixedly inserted into the rotor (32); the eccentric portion (332) is inserted into the piston (24) and is arranged coaxially with the piston (24); The outer diameter D1 of the stator (31) has a value range of 66 mm to 108 mm; The ratio of the height h of the blade (25) to the outer diameter D1 of the stator (31) is 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) is in the range of 0.0105-0.0738; The volume V of the stator (31) is in the range of 81 cm 3 -522cm 3 .

2. The rotary compressor according to claim 1, characterized in that: The cylinder (2) comprises 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) together enclose the compression chamber (201); one side of the piston (24) is attached to the inner cavity (101). The piston (24) is fitted on the side wall of the cylinder body (21), the upper and lower end surfaces of the piston (24) are respectively fitted on the upper cylinder cover (22) and the lower cylinder cover (23), the blade (25) penetrates the cylinder body (21) and extends into the compression chamber (201) and abuts against the outer side surface of the piston (24), the air inlet (211) is opened on the side wall of the cylinder body (21), and the air outlet (221) is opened on the upper cylinder cover (22).

3. The rotary compressor according to claim 1, characterized in that: The radius r of the shaft portion (331) has a value range of r≤8 mm.

4. The rotary compressor according to claim 1, characterized in that: The height of the piston (24) is equal to the height of the blade (25), and 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.

5. The rotary compressor according to claim 1, characterized in that: The value range of the area A of the exhaust port (221) is: A ≥ 9.6 mm 2 .

6. The rotary compressor according to claim 1, characterized in that: The value range of the thickness m of the exhaust port (221) along the axial direction of the housing (1) is: m≤2.8 mm.

7. The rotary compressor according to claim 1, characterized in that: 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 according to claim 1, characterized in that: An air intake pipe (11) is fixedly arranged on the housing (1), and the air intake pipe (11) is connected to the air intake port (211).

9. The rotary compressor according to claim 8, characterized in that: The air inlet pipe (11) is provided with a gas-liquid separator (4).

10. The rotary compressor according to claim 9, characterized in that: The gas-liquid separator (4) is fixedly connected to the housing (1) via a fixing member (12).

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