Pump body of small-shell-diameter compressor and compressor

Abstract

The invention discloses a pump body of a small-shell-diameter rotor compressor and the compressor. The pump body comprises a shell, an air cylinder, a crankshaft, a motor, a rotor and blades. The motor and the air cylinder are both contained in the shell. One end of the crankshaft is connected with the motor, and the other end is rotationally arranged in the shell; the crankshaft comprises a long shaft between the motor and the cylinder, an eccentric part arranged in the cylinder, and a short shaft between the cylinder and the other end of the crankshaft; the rotor is located in the shell and arranged on the eccentric part of the crankshaft in a sleeving mode. One end of each blade is in contact with the rotor, and the other end of each blade is in sliding contact with the inner wall of the cylinder; the size of the pump body meets the following relation: 0.0145 < = Dsh / (Dc * Lv) < = 0.0168; 0.550 < = (Tv * Dpin) / Dca < = 0.709; hpin / Hc is greater than or equal to 0.76 and less than or equal to 0.82. According to the pump body of the small-shell-diameter rotor compressor and the compressor, the problems that in the prior art, a small-shell-diameter compressor is difficult to meet the requirements of small size, low cost and energy efficiency standard can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to a pump body and a compressor of a small shell diameter compressor. Background Art

[0002] The demand in the air-conditioning market in North America is mainly for window air conditioners. The Energy Star 5.0 standard came into effect in October 2023, and the new DOE energy efficiency standard is expected to come into effect in 2026. Both have raised the entry ability requirements for window air conditioners.

[0003] Under the DOE energy efficiency standard proposed to come into effect in 2026, the highest energy efficiency of fixed-speed products meets the TSL 2 entry ability requirements and the TSL 3 entry ability requirements for displacements below 8KBtu / h; the energy efficiency of variable-frequency products meets the TSL 3-5 entry ability requirements (excluding displacements below 8KBtu / h).

[0004] Currently in China, there are few existing small shell diameter 5-7K variable-frequency models, and it is difficult to meet the low-cost requirements. Therefore, it is necessary to design a low-cost solution that meets the new energy efficiency standard and has as small a size as possible for small shell diameter compressors. Summary of the Invention

[0005] The purpose of the present invention is to provide a pump body and a compressor of a small shell diameter compressor to solve the problem in the prior art that it is difficult for small shell diameter compressors to meet the requirements of small size, low cost and energy efficiency compliance.

[0006] To achieve the above purpose, the present invention provides a pump body of a small shell diameter rotary compressor, including a housing, a cylinder, a crankshaft, a motor, a rotor and a vane; the motor and the cylinder are both accommodated in the housing; one end of the crankshaft is connected to the motor, and the other end is rotatably arranged in the housing; the crankshaft includes a long shaft between the motor and the cylinder, an eccentric portion arranged in the cylinder, and a short shaft between the cylinder and the other end of the crankshaft; the rotor is located in the housing and sleeved on the eccentric portion of the crankshaft; one end of the vane contacts the rotor, and the other end slides in contact with the inner wall of the cylinder, and the vane is used to separate the cavity of the cylinder; the size of the pump body satisfies the following relationship:

[0007] 0.0145 ≤ Dsh / (Dc * Lv) ≤ 0.0168;

[0008] 0.550 ≤ (Tv * Dpin) / Dca ≤ 0.709;

[0009] 0.76 ≤ Hpin / Hc ≤ 0.82;

[0010] Among them, Dsh is the shaft diameter of the long shaft, Dc is the inner diameter of the cylinder, Lv is the length of the vane; Tv is the thickness of the vane, Dpin is the outer diameter of the eccentric part; Dca is the inner diameter of the housing; Hpin is the height of the eccentric part, and Hc is the height of the cylinder.

[0011] Further, the shaft diameter of the long shaft is 11 - 12.8 mm, and the shaft diameter of the short shaft is 9 - 10.8 mm.

[0012] Further, the outer diameter of the eccentric part is 18.4 - 19.4 mm, and the height of the eccentric part is 10 - 12.2 mm.

[0013] Further, the inner diameter of the housing is 88 - 92 mm.

[0014] Further, the height of the cylinder is 13 - 15 mm, and the inner diameter of the cylinder is 34 - 36 mm.

[0015] Further, the thickness of the vane is 2.8 - 3.2 mm, and the length of the vane is 19.5 - 20.5 mm.

[0016] Further, the material of the crankshaft is selected from FCD700 ductile iron material or 20Cr forged steel material.

[0017] The present invention also provides a rotary compressor, including the pump body of the small housing diameter rotary compressor as described above.

[0018] Further, the displacement of the compressor is 4.2 - 5.5 cc.

[0019] In summary, for the pump body and the compressor of the small housing diameter rotary compressor provided by the present invention, by optimizing the dimensions of the key components of the pump body, on the one hand, the size of the compressor pump body can be reduced, and on the other hand, the performance of the compressor can be improved on the premise of reducing the pump body size. The coefficient of performance COP of the compressor can be increased from 4.2 to 4.3, and the efficiency of the pump body is increased by 1.5% - 2.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the pump body of the small housing diameter compressor provided by an embodiment of the present invention;

[0021] Figure 2 It is a partial structural schematic diagram of the pump body of the small housing diameter compressor provided by an embodiment of the present invention;

[0022] Figure 3 It is a schematic top - view sectional structure diagram of the cylinder of the pump body of the small housing diameter compressor provided by an embodiment of the present invention;

[0023] Among them, the description of the reference numerals is as follows:

[0024] 10 - Housing; 20 - Cylinder; 30 - Crankshaft; 40 - Motor; 50 - Rotor; 60 - Vane; 21 - Cylinder body; 22 - Upper cylinder cover; 23 - Lower cylinder cover; 31 - Long shaft; 32 - Eccentric part; 33 - Short shaft. Detailed implementation manners

[0025] The pump body and the compressor of the small - diameter compressor proposed by the present invention will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and use non - precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0027] In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0028] Figure 1 It is a schematic structural diagram of the pump body of a small - diameter rotor compressor provided by the present invention, which includes a housing 10, a cylinder 20, a crankshaft 30, a motor 40, a rotor 50 and a vane 60; the motor 40 and the cylinder 20 are both accommodated in the housing 10; one end of the crankshaft 30 is connected to the motor 40, and the other end is rotatably arranged in the housing 10; the crankshaft 30 includes a long shaft 31 between the motor 40 and the cylinder 20, an eccentric part 32 arranged in the cylinder 20, and a short shaft 33 between the cylinder 20 and the other end of the crankshaft 30; the rotor 50 is located in the housing 10 and sleeved on the eccentric part 32 of the crankshaft 30; one end of the vane 60 is in contact with the rotor 50, and the other end is in sliding contact with the inner wall of the cylinder 20, and the vane 60 is used to separate the cavity of the cylinder 20.

[0029] Among them, the motor 40 is used to drive the crankshaft 30 to rotate. The rotation of the crankshaft 30 drives its eccentric part 32 to perform eccentric rotational motion inside the cylinder 20. Since the rotor 50 is sleeved on the eccentric part 32, the rotor 50 will also perform eccentric rotation inside the cylinder 20. The inside of the cylinder 20 is a structure approximately in the shape of a cylinder. The rotor 50 rotates eccentrically around the inner wall of the cylinder 20. The contact point between the rotor 50 and the inside of the cylinder and the vane 60 divide the inside of the cylinder 20 into two cavities. The eccentric rotation of the rotor 50 will cause the volume between the two cavities to change, thereby realizing the compression of the refrigerant in the cavity of the cylinder 20.

[0030] As an implementation scheme, the cylinder 20 may include a cylinder body 21, and an upper cylinder head 22 and a lower cylinder head 23 that seal both ends of the cylinder body. Coaxial holes are provided on the upper cylinder head 22 and the lower cylinder head 23, and a bearing can be respectively installed. One end of the long axis 31 of the crankshaft 30 is connected to the motor 40, and the other end is rotatably passed through the bearing of the upper cylinder head 22 and eccentrically connected to the eccentric part 32. One end of the short axis 33 is connected to the eccentric part 32, and the other end is rotatably passed through the bearing of the lower cylinder head 23. In this way, the long axis 31 of the crankshaft 30 rotates coaxially with the short axis 33, while the eccentric part 32 performs eccentric rotation. At the same time, a blade groove can be recessed inwardly on the inner wall of the cylinder 20, one end of the blade 60 is slidably set in the blade groove, and the other end extends out of the blade groove toward the rotor 50 and abuts against the outer wall of the rotor 50. In this way, when the rotor 50 rotates eccentrically, the blade 60 will also move linearly in the blade groove along the extension direction of the blade groove, so that the blade 60 always plays the role of separating the inner cavity of the cylinder.

[0031] In theory, for compressors used in small appliances such as window air conditioners, the smaller the size of the rotary compressor, the more helpful it is to reduce the size of these appliances. However, this does not mean that the size of the rotary compressor can be reduced indefinitely, because the normal power output requirements and the energy efficiency standards for compressors in various places must be taken into account.

[0032] Generally speaking, the dimensions of multiple components of the compressor pump body will directly affect the efficiency and energy efficiency coefficient of the compressor, and there are many correlations between these parameters. Only when the parameters of these components meet certain conditions can the performance of the compressor be comprehensively improved. For example, for a rotor compressor with a small shell diameter, on the one hand, it is necessary to reduce the dimensions of the key components of the compressor as much as possible to reduce the volume of the compressor, and on the other hand, it is necessary to match and optimize the dimensions of the various structural components of the compressor to maximize the efficiency and energy efficiency coefficient of the compressor while reducing the size.

[0033] After a long period of repeated experiments, the inventors found that for a rotor compressor with a small shell diameter, in the pump body structure provided by the present invention, when the size of the pump body satisfies the following relationship, the performance parameters of the compressor will reach the optimum. Specifically, it needs to meet the following conditions:

[0034] 0.0145≤Dsh / (Dc*Lv)≤0.0168;

[0035] 0.550≤(Tv*Dpin) / Dca≤0.709;

[0036] 0.76≤Hpin / Hc≤0.82;

[0037] Combination Figure 2and Figure 3 As shown, where Dsh is the shaft diameter of the long shaft 31, Dc is the inner diameter of the cylinder 20, Lv is the length of the vane 60; Tv is the thickness of the vane 60, Dpin is the outer diameter of the eccentric part 32 of the crankshaft; Dca is the inner diameter of the housing 10; Hpin is the height of the eccentric part 32, and Hc is the height of the cylinder 20.

[0038] In the solution of the present invention, by optimizing the key parameters of the compressor pump body, on the one hand, the size of the compressor pump body can be significantly reduced, and on the other hand, the performance of the compressor can be improved on the premise of reducing the size of the pump body. The coefficient of performance COP of the compressor can be increased from 4.2 to 4.3, and the efficiency of the pump body is increased by 1.5% - 2.5%.

[0039] As a preferred solution of the present invention, the shaft diameter Dsh of the long shaft 31 can be 11 - 12.8 mm, preferably 11 mm, the shaft diameter of the short shaft 33 is 9 - 10.8 mm, preferably 9 mm; the outer diameter of the eccentric part 32 of the crankshaft is 18.4 - 19.4 mm, and the height of the eccentric part 32 is 10 - 12.2 mm; the inner diameter of the housing 10 is 88 - 92 mm; the height of the cylinder 20 is 13 - 15 mm, the inner diameter of the cylinder 20 is 34 - 36 mm; the thickness of the vane 60 is 2.8 - 3.2 mm, and the length of the vane 60 is 19.5 - 20.5 mm.

[0040] Compared with the existing small - shell - diameter rotary compressors, the shaft diameter of the long shaft is generally greater than 13 mm, and the shaft diameter of the short shaft is greater than 11 mm; in the preferred solution of the present invention, the shaft diameter of the crankshaft is appropriately reduced. The most intuitive effect is that the frictional power can be reduced and the efficiency of the compressor pump body can be improved.

[0041] In addition, the present invention also makes an overall adaptive optimization of the shafting structure and the dimensions of other related components of the pump body. This optimization does not directly reduce the size, but appropriately optimizes the overall pump body structure on the premise that the dimensions of each component meet the above - mentioned proportional formula, reduces the heat - transfer area, and improves the efficiency of the compressor pump body. By optimizing the cost - performance ratio of the motor in this case, the cost - performance ratio of the compressor is improved.

[0042] In addition, since the size of the crankshaft 30 has been reduced, in order to reduce the phenomenon of insufficient crankshaft stiffness caused by the reduction of the crankshaft size and prevent the crankshaft from breaking when the rotor rotates, the material of the crankshaft 30 has also been optimized in the present invention. For rotary compressors, the grade of the ductile iron crankshaft used in the current prior art mainstream products is FCD600. In the technical solution of the present invention, while adopting a thin shaft diameter, the crankshaft rigidity is improved by using a higher grade of FCD700 ductile iron material. However, the inventor has also found through a large number of experiments that when the ductile iron grade is further increased, the increase in elastic modulus is relatively limited and the contribution to the improvement of crankshaft rigidity is small. Therefore, in the solution of the present invention, the material of the crankshaft 30 is preferably FCD700 ductile iron material. In addition, the inventor has found through a large number of experiments that a new material, 20Cr forged steel material, can also be used to improve the rigidity of the crankshaft 30. Its material properties can greatly improve the elastic modulus and tensile strength of the crankshaft 30, etc., and it has high strength and hardenability, no temper brittleness, and can withstand heavy alternating loads, impact loads and strong friction. When selecting 20Cr forged steel material, the production process is different from that of conventional crankshafts. Carburizing and quenching treatment need to be carried out before extrusion to improve the hardness of the crankshaft core and surface. After processing, manganese treatment process can also be carried out to improve the wear resistance and anti-adhesion performance of the material and extend the service life of parts. Without manganese treatment, abnormal wear may occur, resulting in the situation of crankshaft seizure.

[0043] The present invention also provides a rotary compressor, including the pump body of the small shell diameter rotary compressor as described above. The rotary compressor including the above pump body structure can achieve a displacement of the compressor of 4.2 - 5.5 cc. The coefficient of performance COP of the compressor is increased to 4.3, which can meet the Energy Star 5.0 standard and the upcoming DOE energy conservation new standard.

[0044] In summary, for the pump body and compressor of the small shell diameter rotary compressor provided by the present invention, by optimizing the sizes of the key components of the pump body, on the one hand, the size of the compressor pump body can be reduced, and on the other hand, the performance of the compressor can be improved on the premise of reducing the pump body size. The coefficient of performance COP of the compressor can be increased from 4.2 to 4.3, and the efficiency of the pump body is increased by 1.5% - 2.5%.

[0045] The above are only the preferred embodiments of the present invention and do not impose any limitation on the present invention. Any person skilled in the art, without departing from the technical solution of the present invention, makes any form of equivalent substitution or modification and other changes to the technical solution and technical content disclosed by the present invention, all of which belong to the content within the technical solution of the present invention and still fall within the protection scope of the present invention.

Claims

1. The pump body of a small shell diameter rotary compressor, characterized in that, It includes a housing, a cylinder, a crankshaft, a motor, a rotor and a blade; Both the motor and the cylinder are accommodated in the housing; One end of the crankshaft is connected to the motor, and the other end is rotatably arranged in the housing; The crankshaft includes a long shaft between the motor and the cylinder, an eccentric part arranged in the cylinder, and a short shaft between the cylinder and the other end of the crankshaft; The rotor is located in the housing and sleeved on the eccentric part of the crankshaft; One end of the blade contacts the rotor, and the other end slides in contact with the inner wall of the cylinder. The blade is used to separate the cavity of the cylinder; The size of the pump body satisfies the following relationship: 0.0145 ≤ Dsh / (Dc * Lv) ≤ 0.0168; 0.550 ≤ (Tv * Dpin) / Dca ≤ 0.709; 0.76 ≤ Hpin / Hc ≤ 0.82; Wherein, Dsh is the shaft diameter of the long shaft, Dc is the inner diameter of the cylinder, Lv is the length of the blade; Tv is the thickness of the blade, Dpin is the outer diameter of the eccentric part; Dca is the inner diameter of the housing; Hpin is the height of the eccentric part, and Hc is the height of the cylinder.

2. The pump body of the small shell diameter rotor compressor according to claim 1, characterized in that, The shaft diameter of the long shaft is 11 - 12.8 mm, and the shaft diameter of the short shaft is 9 - 10.8 mm.

3. The pump body of the small shell diameter rotary compressor according to claim 1, characterized in that, The outer diameter of the eccentric part is 18.4 - 19.4 mm, and the height of the eccentric part is 10 - 12.2 mm.

4. The pump body of the small shell diameter rotor compressor according to claim 1, characterized in that, The inner diameter of the housing is 88 - 92 mm.

5. The pump body of the small shell diameter rotary compressor according to claim 1, characterized in that The height of the cylinder is 13 - 15 mm, and the inner diameter of the cylinder is 34 - 36 mm.

6. The pump body of the small-shell-diameter rotary compressor according to claim 1, characterized in that, The thickness of the blade is 2.8 - 3.2 mm, and the length of the blade is 19.5 - 20.5 mm.

7. The pump body of the small shell diameter rotary compressor according to claim 1, characterized in that, The material of the crankshaft is selected from FCD700 ductile iron material or 20Cr forged steel material.

8. A rotary compressor, characterized in that, It includes the pump body of the small shell diameter rotor compressor according to any one of claims 1 - 7.

9. A rotary compressor according to claim 8, characterized in that, The displacement of the compressor is 4.2 - 5.5 cc.

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