Crankshaft, compressor and refrigeration apparatus

Abstract

A crankshaft, a compressor and a refrigeration apparatus. The crankshaft (10) comprises a long shaft portion (11), an eccentric portion (12) and a short shaft portion (13), which are sequentially arranged in an axial direction. The shaft diameter of the long shaft portion (11) is r1, and the shaft diameter of the short shaft portion (13) is r2, satisfying: 18 mm≤r1≤20 mm, and 16 mm≤r2≤18 mm. The structure reduces the shaft diameters of the long and short shafts of the crankshaft, and further reduces contact areas between the crankshaft and upper and lower bearings, and reduces the contact friction between the crankshaft and the upper and lower bearings, thereby reducing the mechanical loss of the compressor, and improving the operating efficiency and performance of the compressor.

Description

Crankshafts, compressors and refrigeration equipment Technical Field

[0001] This invention relates to the field of refrigeration technology, specifically to a crankshaft, a compressor, and a refrigeration device. Background Technology

[0002] A hermetic compressor includes an electric motor housed inside a sealed casing that generates driving force, and a pump assembly connected to the motor for compressing the refrigerant. Hermetic compressors can be classified into reciprocating compressors, scroll compressors, and rolling rotor compressors based on their refrigerant compressor structure.

[0003] Roller compressors, with their advantages of small size and low cost, are widely used in air conditioning, heat pumps, and other fields. The working principle of existing roller compressors is as follows: the crankshaft of the pump body rotates under the drive of a motor. This crankshaft rotation drives rollers in eccentric circular motion, thereby compressing the refrigerant. Because the crankshaft is constantly rotating at high speed, the moving parts in the compressor—the major and minor shafts of the crankshaft and the inner walls of the upper and lower bearings, and the eccentric part of the crankshaft and the inner circle of the rollers—experience intense friction. Sufficient lubrication is required to reduce contact friction and minimize mechanical losses, thus ensuring stable compressor operation. However, with the trend towards compressor miniaturization, the mechanical losses in existing small compressors are still relatively high, affecting compressor performance.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include, but does not constitute, information on prior art known to those skilled in the art. Summary of the Invention

[0005] In view of the problems in the prior art, the purpose of this invention is to provide a crankshaft, a compressor and a refrigeration device to reduce the mechanical loss of the compressor and improve the efficiency of the compressor.

[0006] This invention provides a crankshaft comprising a long shaft portion, an eccentric portion, and a short shaft portion arranged sequentially along the axial direction. The shaft diameter of the long shaft portion is r1, and the shaft diameter of the short shaft portion is r2, satisfying: 18mm≤r1≤20mm, 16mm≤r2≤18mm.

[0007] In some embodiments, the height of the eccentric portion is 17.5 mm to 18 mm.

[0008] This invention also provides a compressor, including a pump body assembly, the pump body assembly including the crankshaft as described in claim 1.

[0009] In some embodiments, the compressor further includes a housing, and the pump assembly is disposed inside the housing.

[0010] In some embodiments, the housing includes an intermediate housing and an upper housing and a lower housing located at both ends of the intermediate housing.

[0011] In some embodiments, the ratio of the inner diameter of the intermediate housing to the axial diameter of the long shaft portion ranges from 6.61 to 7.34.

[0012] In some embodiments, the ratio of the inner diameter of the intermediate housing to the axial diameter of the short shaft portion ranges from 7.34 to 8.26.

[0013] In some embodiments, the pump body assembly further includes a cylinder, an upper bearing, a lower bearing, and rollers; the upper bearing and the lower bearing are respectively located at both ends of the cylinder, the crankshaft extends through both ends of the cylinder, and the rollers are sleeved on the outside of the eccentric portion and located inside the cylinder.

[0014] In some embodiments, a motor assembly is also included, located inside the housing and connected to the crankshaft.

[0015] This invention also provides a refrigeration device, including the compressor described above.

[0016] The crankshaft, compressor, and refrigeration equipment provided by this invention have the following advantages:

[0017] The crankshaft in the compressor comprises a long shaft section, an eccentric section, and a short shaft section arranged sequentially along the axial direction. The diameter of the long shaft section is r1, and the diameter of the short shaft section is r2, satisfying: 18mm ≤ r1 ≤ 20mm, 16mm ≤ r2 ≤ 18mm. Compared to the crankshaft diameter of compressors in the prior art, the crankshaft diameter of the compressor in this invention is smaller, thus reducing the contact area between the crankshaft and the upper and lower bearings, reducing the contact friction between the crankshaft and the upper and lower bearings, thereby reducing the mechanical losses of the compressor, improving the compressor's working efficiency, and enhancing the compressor's performance. Attached Figure Description

[0018] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0019] Figure 1 is a schematic diagram of the compressor according to an embodiment of the present invention.

[0020] Reference numerals: 10 Crankshaft; 11 Long shaft section; 12 Eccentric section; 13 Short shaft section; 21 Intermediate housing; 22 Upper housing; 23 Lower housing; 30 Cylinder block; 40 Upper bearing; 50 Lower bearing; 60 Roller; 70 Motor assembly. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0022] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0023] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] It should be further understood that the terms "comprising" or "including" indicate the presence of a feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" as used herein are interpreted as inclusive, or mean any one or any combination thereof. Therefore, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition only arise when a combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0025] Compared to small-displacement compressors, the crankshaft diameter of existing compressors is relatively large, resulting in a larger contact area between the crankshaft and the upper and lower bearings. This leads to greater contact friction, which in turn causes significant mechanical losses to the compressor and affects its performance.

[0026] To address the problems in the prior art, this invention provides a crankshaft comprising a long shaft portion, an eccentric portion, and a short shaft portion arranged sequentially along the axial direction. The diameter of the long shaft portion is r1, and the diameter of the short shaft portion is r2, satisfying: 18mm ≤ r1 ≤ 20mm, 16mm ≤ r2 ≤ 18mm. This invention reduces the shaft diameters of the long and short shafts of the crankshaft, thereby reducing the contact area between the crankshaft and the upper and lower bearings, reducing the contact friction between the crankshaft and the upper and lower bearings, thus reducing the mechanical losses of the compressor, improving the compressor's working efficiency, and enhancing the compressor's performance.

[0027] Furthermore, embodiments of the present invention also provide a compressor, including a pump body assembly, the pump body assembly including the crankshaft as described above. This compressor includes the aforementioned crankshaft, thus achieving all the technical effects of the crankshaft described above, reducing the contact area between the crankshaft and the upper and lower bearings, reducing contact friction between the crankshaft and the upper and lower bearings, thereby reducing the mechanical losses of the compressor, improving the compressor's working efficiency, and enhancing compression performance.

[0028] The electric vacuum pump of the present invention will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments are not intended to limit the scope of protection of the present invention.

[0029] Figure 1 shows a schematic diagram of a compressor according to an embodiment of the present invention. As shown in Figure 1, the compressor's pump body assembly includes a crankshaft 10, which includes a long shaft portion 11, an eccentric portion 12, and a short shaft portion 13 arranged sequentially along the axial direction. The shaft diameter of the long shaft portion 11 is r1, and the shaft diameter of the short shaft portion 13 is r2, satisfying: 18mm≤r1≤20mm, 16mm≤r2≤18mm. By reducing the shaft diameters of the long shaft portion 11 and the short shaft portion 13 of the crankshaft 10, the contact area between the crankshaft 10 and the upper and lower bearings is reduced, thereby reducing the contact friction between the crankshaft 10 and the upper and lower bearings, which in turn reduces the mechanical losses of the compressor and improves the mechanical efficiency of the compressor.

[0030] Furthermore, the major axis portion 11 is typically coaxial with the minor axis portion 13, while the eccentric portion 12 is not coaxial with either the major axis portion 11 or the minor axis portion 13. For example, r1 can be 18.2mm, 18.4mm, 18.6mm, 18.8mm, 19mm, 19.2mm, 19.4mm, 19.6mm, and 19.8mm. For example, r2 can be 16.2mm, 16.4mm, 16.6mm, 16.8mm, 17mm, 17.2mm, 17.4mm, 17.6mm, and 17.8mm.

[0031] Furthermore, in some embodiments, the height of the eccentric portion 12 is 17.5 mm to 18 mm. By limiting the height of the eccentric portion 12, it is beneficial to reduce the contact area between the eccentric portion 12 and the inner circle of the compressor roller, thereby reducing the contact friction between the two and further reducing the mechanical loss of the compressor.

[0032] Furthermore, the compressor also includes a housing, with the pump assembly disposed inside the housing. As shown in Figure 1, the compressor housing in this embodiment of the invention includes an intermediate housing 21 and an upper housing 22 and a lower housing 23 located at opposite ends of the intermediate housing 21. The intermediate housing 21 is a hollow cylindrical structure with an inner diameter R. The ratio of the inner diameter R of the intermediate housing 21 to the shaft diameter r1 of the long shaft portion 11 ranges from 6.61 to 7.34. An improperly designed intermediate housing 21 may lead to poor gas flow, increased energy consumption, and reduced compressor efficiency. Therefore, by reasonably setting the range of the ratio of the inner diameter of the intermediate housing 21 to the shaft diameter of the long shaft portion 11, frictional losses during gas compression can be reduced, and compression efficiency can be improved. Studies have found that a shaft diameter ratio of the intermediate housing 21 to the long shaft portion 11 between 6.61 and 7.34 can achieve good compression efficiency. In some embodiments, the ratio of the inner diameter of the intermediate housing 21 to the shaft diameter of the short shaft portion 13 ranges from 7.34 to 8.26. Similarly, by appropriately setting the ratio of the inner diameter of the intermediate housing 21 to the shaft diameter of the short shaft 13, frictional losses during gas compression can be reduced, thereby improving compressor efficiency. Studies have shown that a shaft diameter ratio of 6.61 to 7.34 between the intermediate housing 21 and the short shaft 13 results in good compression efficiency.

[0033] Furthermore, as shown in Figure 1, the pump body assembly also includes a cylinder 30, an upper bearing 40, a lower bearing 50, and rollers 60. The upper bearing 40 and the lower bearing 50 are located at both ends of the cylinder 30, and the crankshaft 10 extends through both ends of the cylinder 30. The rollers 60 are sleeved on the outside of the eccentric portion 12 and located inside the cylinder 30. It should be noted that since the long shaft portion 11 and the short shaft portion 13 of the crankshaft 10 are connected to the upper bearing 40 and the lower bearing 50 respectively, when the shaft diameters of the long shaft portion 11 and the short shaft portion 13 change, the dimensions of the upper bearing 40 and the lower bearing 50 can be adjusted accordingly to obtain a compressor with better performance.

[0034] Furthermore, the compressor also includes a motor assembly 70, located inside the housing and connected to the crankshaft 10. When the motor assembly 70 is running, it drives the crankshaft 10 to rotate, and the crankshaft 10 then drives the rollers 60 to roll along the inner wall of the cylinder. The outer wall of the rollers 60 and the inner wall of the cylinder 30 form a crescent-shaped working chamber. The crescent-shaped working chamber is divided into two parts: a suction chamber and a compression chamber. Low-pressure refrigerant is drawn into the suction chamber, and then the low-pressure refrigerant is compressed into high-pressure refrigerant as the rollers 60 rotate. When the pressure of the high-pressure refrigerant is greater than the pressure of the exhaust valve, it is discharged from the high-pressure chamber and then enters the refrigeration cycle system for heat exchange.

[0035] The compressor provided in this embodiment of the invention has a height of 315.5mm to 325.5mm, a displacement of 24.4cc to 29.5cc, a maximum motor stack height of 110L, and a lubrication capacity of 520 to 610ml.

[0036] To further explore the beneficial effects of the compressor provided in the embodiments of the present invention, the coefficient of performance (COP) of existing compressors and the compressor provided in the embodiments of the present invention is compared under the same operating conditions. COP is an important indicator for measuring compressor performance, representing the cooling capacity obtained per unit of power consumption. COP = Q / W, where Q represents the cooling capacity and W represents the input power of the motor.

[0037] It should be noted that the existing rolling rotor compressor model compared here has a height of 315mm to 325.5mm, an inner diameter of the compressor's intermediate housing of 132.1mm, a crankshaft long shaft diameter of 21mm, a crankshaft short shaft diameter of 18mm, a crankshaft eccentric height of 17.5mm to 18mm, a displacement of 24.4cc to 29.5cc, a maximum motor stack height of 110L, and a lubrication capacity of 520ml to 610ml. The compressor provided in the comparative embodiment of the present invention has a height of 315mm to 325.5mm, an inner diameter of the compressor's intermediate housing of 132.1mm, a crankshaft long shaft diameter of 19mm, a crankshaft short shaft diameter of 17mm, a crankshaft eccentric height of 17.5mm to 18mm, a displacement of 24.4cc to 29.5cc, a maximum motor stack height of 110L, and a lubrication capacity of 520ml to 610ml. Table 1 shows the cooling capacity, motor input power, and COP of a compressor in the prior art and the compressor provided in the embodiments of the present invention under two operating conditions.

[0038] Table 1 shows the cooling capacity, motor input power, and COP of compressors in the prior art and the compressor provided in the embodiments of the present invention under two operating conditions.

[0039] According to Table 1, when both compressors are operating under condition one, compared to compressors in the prior art, the compressor provided by this embodiment of the invention has a 2.3% higher cooling capacity, a 1% lower power consumption, and a 3% higher COP. When both compressors are operating under condition two, compared to compressors in the prior art, the compressor provided by this embodiment of the invention has a 1.6% higher cooling capacity, a 1% higher power consumption, and a 1% higher COP.

[0040] Therefore, the compressor provided in this embodiment of the invention has a better COP, and the performance of the compressor is improved.

[0041] Furthermore, embodiments of the present invention also provide a refrigeration device, including the compressor described above. This refrigeration device includes the aforementioned compressor, and therefore achieves all the technical effects of a compressor, which will not be elaborated further here.

[0042] In summary, the crankshaft, compressor, and refrigeration equipment provided by this invention have the following advantages:

[0043] The crankshaft in the compressor comprises a long shaft section, an eccentric section, and a short shaft section arranged sequentially along the axial direction. The diameter of the long shaft section is r1, and the diameter of the short shaft section is r2, satisfying: 18mm ≤ r1 ≤ 20mm, 16mm ≤ r2 ≤ 18mm. Compared to the crankshaft diameter in the prior art, the diameters of the long and short shafts of the crankshaft are reduced, thereby reducing the contact area between the crankshaft and the upper and lower bearings, reducing the contact friction between the crankshaft and the upper and lower bearings, thus reducing the mechanical losses of the compressor, improving the compressor's working efficiency, and enhancing the compressor's performance.

[0044] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A crankshaft, characterized in that, It includes a long shaft portion, an eccentric portion and a short shaft portion arranged sequentially along the axial direction. The shaft diameter of the long shaft portion is r1 and the shaft diameter of the short shaft portion is r2, satisfying: 18mm≤r1≤20mm, 16mm≤r2≤18mm.

2. The crankshaft according to claim 1, characterized in that, The height of the eccentric part is 17.5mm to 18mm.

3. A compressor, characterized in that, It includes a pump body assembly, which includes the crankshaft as described in claim 1 or 2.

4. The compressor according to claim 3, characterized in that, The compressor also includes a housing, and the pump assembly is disposed inside the housing.

5. The compressor according to claim 4, characterized in that, The housing includes an intermediate housing and an upper housing and a lower housing located at both ends of the intermediate housing.

6. The compressor according to claim 5, characterized in that, The ratio of the inner diameter of the intermediate housing to the axial diameter of the long shaft portion ranges from 6.61 to 7.

34.

7. The compressor according to claim 5, characterized in that, The ratio of the inner diameter of the intermediate housing to the axial diameter of the short shaft portion ranges from 7.34 to 8.

26.

8. The compressor according to claim 3, characterized in that, The pump body assembly also includes a cylinder, an upper bearing, a lower bearing, and rollers; the upper bearing and the lower bearing are respectively located at both ends of the cylinder, the crankshaft passes through both ends of the cylinder, and the rollers are sleeved on the outside of the eccentric portion and located inside the cylinder.

9. The compressor according to claim 8, characterized in that, It also includes a motor assembly, located inside the housing, connected to the crankshaft.

10. A refrigeration device, characterized in that, Includes the compressor as described in any one of claims 3 to 9.

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