CN-117167280-B - Balance weight structure, rotor assembly, pump body and compressor

Abstract

The invention provides a balance block structure, a rotor assembly, a pump body and a compressor, relates to the technical field of compressors, and solves the technical problem of oil stirring of a crankshaft short shaft balance block. The balance block structure comprises a balance block body, an oil storage cavity, a lower flange and an oil storage cavity, wherein the balance block body is of an eccentric structure and is arranged on a short shaft of a crankshaft, the oil storage cavity is arranged on the balance block body, the top surface of the oil storage cavity is higher than the bottom surface of the lower flange sleeved on the short shaft so as to enclose a synthetic oil way sealing cavity between the oil storage cavity, the lower flange and the crankshaft, and the oil storage cavity is in clearance fit with the periphery of the lower flange so as to allow gas to pass through. The invention not only has the structural function of the crankshaft short shaft balance block, but also can effectively reduce the weight of the compressor rotor balance block, enable the whole balance system to move downwards, reduce the deflection of the top of the crankshaft, improve the stability and reliability of the shafting, realize the complete separation of oil and gas paths in the lower flange cavity, effectively solve the problem of oil stirring of the crankshaft short shaft balance block, greatly reduce the power consumption of the compressor, and improve the performance and reliability of the compressor.

Inventors

• CUI XUEMEI
• LIANG SHEBING
• QUE PEIZHEN
• ZHU TAO

Assignees

• 珠海凌达压缩机有限公司
• 珠海格力电器股份有限公司

Dates

Publication Date

20260505

Application Date

20230913

Claims (13)

1. 1. A weight structure, comprising: the balance weight body is of an eccentric structure and is arranged on the short shaft of the crankshaft; The oil storage cavity is formed in the balance block body, the lower ends of the shaft neck of the lower flange and the short shaft extend into the oil storage cavity, a space is reserved between the lower end of the shaft neck and the lower end of the short shaft, an oil return hole is formed in the short shaft corresponding to the space, and an oil conveying hole is formed in the bottom surface of the oil storage cavity; The lower flange is sleeved on the short shaft to support the short shaft, and the top surface of the oil storage cavity is higher than the bottom surface of the journal of the lower flange so as to enclose a synthetic oil way sealing cavity among the oil storage cavity, the lower flange and the crankshaft; the oil storage cavity is in clearance fit with the periphery of the lower flange so as to allow gas to pass through.
2. 2. The weight structure of claim 1, wherein a gap δ between the oil reservoir and the lower flange periphery is 0.04-0.06mm.
3. 3. The weight structure of claim 1, wherein the weight body comprises a base body, an eccentric portion, a connecting portion, and an oil delivery hole, wherein: the eccentric part is arranged at one side of the base body; the oil storage cavity is formed at the top of the matrix; The connecting part is arranged at the bottom of the basal body; The oil delivery hole penetrates through the connecting portion and is communicated with the oil storage cavity.
4. 4. A rotor assembly comprising a crankshaft, a lower flange, the crankshaft comprising a stub shaft, the lower flange being journalled on the stub shaft, the counterweight structure of any one of claims 1-3 being mounted on the stub shaft.
5. 5. The rotor assembly of claim 4 wherein the oil return holes are straight holes or inclined holes.
6. 6. The rotor assembly of claim 4 wherein the number of oil return holes is at least one, and all of the oil return holes are uniformly disposed along the minor axis circumferential direction.
7. 7. The rotor assembly of claim 4 wherein the crankshaft comprises at least one eccentric shaft, the eccentric portion of the counterweight body being disposed at an angle of 180 ° to the adjacent eccentric shaft in the horizontal direction.
8. 8. The rotor assembly of claim 6 wherein the total passage cross-sectional area S of the oil return holes and the cross-sectional area S0 of the central oil hole of the crankshaft have a relationship of 0.2S/S0 0.4.
9. 9. The rotor assembly of claim 4 wherein the weight body upper end surface and the lower journal end surface of the lower flange have a height difference h in the axial direction.
10. 10. The rotor assembly of claim 9 wherein the height difference h is ≡1.
11. 11. The rotor assembly of claim 4 wherein the lower flange inner bore side wall is provided with a spiral oil groove or a plurality of vertical oil grooves for the pumped oil to circulate upward, and when the oil groove is a spiral oil groove, the spiral direction is the same as the rotation direction of the crankshaft.
12. 12. A pump body comprising a rotor assembly according to any one of claims 4 to 11.
13. 13. A compressor comprising the pump body of claim 12.

Description

Balance weight structure, rotor assembly, pump body and compressor Technical Field The invention relates to the technical field of compressors, in particular to a balance block structure, a rotor assembly, a pump body and a compressor. Background With the continuous development of rotor compressor technology, the development requirements of low cost and miniaturization of the compressor are more and more strong, and the smaller the outer diameter of the compressor is, the larger the corresponding compressor displacement is. The displacement of the compressor is proportional to the number of cylinders, the height of the cylinders, the inside diameter of the cylinders, and the eccentric amount of the crankshaft. When the outer diameter of the shell of the compressor is constant, the inner diameter of the cylinder has a maximum limit value, and when the inner diameter of the cylinder reaches the maximum limit value range, the height of the cylinder can only be increased when the displacement of the cylinder needs to be further increased, and the higher the cylinder is, the larger the corresponding bearing span is, the contact stress of the edge of the crankshaft bearing is increased, and the problems of abrasion of bearing parts and reduced reliability are caused. In order to solve the problem of poor reliability caused by large bearing span of the large-displacement rotor compressor, as shown in fig. 1 and 2, in the prior art, a crankshaft balance block 110 scheme is arranged on a short shaft 1602 of a crankshaft 160 so as to optimize a shafting balance structure and reduce the deflection of the crankshaft to improve shafting stability and reliability. However, the conventional crankshaft short shaft balance block scheme has the problems of balance block oil stirring, increased load in the operation process of the compressor, large fluctuation of oil level, increased power consumption, reduced energy efficiency, noise, poor reliability and the like. Disclosure of Invention The invention aims to provide a balance block structure and a rotor assembly, which are used for solving the technical problem of oil stirring of a crankshaft short shaft balance block in the prior art, greatly reducing the power consumption and the oil surface fluctuation of a compressor and improving the comprehensive performance and the reliability of the compressor In order to achieve the above purpose, the present invention provides the following technical solutions: In a first aspect, the present invention provides a balance weight structure, including: the balance weight body is of an eccentric structure and is arranged on the short shaft of the crankshaft; The oil storage cavity is formed in the balance block body; the top surface of the oil storage cavity is higher than the bottom surface of the lower flange sleeved on the short shaft so as to enclose a synthetic oil way sealing cavity among the oil storage cavity, the lower flange and the crankshaft; the oil storage cavity is in clearance fit with the periphery of the lower flange so as to allow gas to pass through. Further, the size of a gap delta between the oil storage cavity and the periphery of the lower flange is 0.04-0.06mm. Further, the balance block body comprises a base body, an eccentric part, a connecting part and an oil transmission hole, wherein: the eccentric part is arranged at one side of the base body; the oil storage cavity is formed at the top of the matrix; The connecting part is arranged at the bottom of the basal body; The oil delivery hole penetrates through the connecting portion and is communicated with the oil storage cavity. The balance block structure is arranged on a short shaft of a crankshaft and is of an eccentric structure, has the structural function of the crankshaft short shaft balance block, can effectively reduce the weight of a rotor balance block of a compressor, enables the whole balance system to move downwards, reduces the deflection of the top of the crankshaft, improves the stability and reliability of a shafting, and is characterized in that an oil storage tank is arranged on a balance block body and is positioned at the tail end of the short shaft, the top surface of the oil storage cavity is higher than the bottom surface of a lower flange sleeved on the short shaft, so that an oil way sealing cavity is formed by surrounding the oil storage cavity, the lower flange and the crankshaft, the oil and an air way in the lower flange cavity can be completely separated, the problem of stirring the oil of the crankshaft short shaft balance block can be effectively solved, the power consumption of the compressor is greatly reduced, and the performance and the reliability of the compressor are improved. In a second aspect, the rotor assembly comprises a crankshaft and a lower flange, wherein the crankshaft comprises a short shaft, the lower flange is sleeved on the short shaft, the balance block structure is arranged on the short shaft, and a