Double-support crankshaft capable of increasing lubricating oil amount and commercial compressor

Abstract

The double-support crankshaft comprises a long shaft, an eccentric shaft and an upper support shaft which are sequentially arranged from bottom to top, the long shaft and the upper support shaft are coaxially arranged, an eccentric distance is arranged between the eccentric shaft and the long shaft, a spiral oil groove A is formed in the outer wall face of the long shaft, a spiral oil groove B is formed in the outer wall face of the eccentric shaft, and the spiral oil groove A is communicated with the spiral oil groove B; an oil duct is arranged in the eccentric shaft, the bottom end of the oil duct is communicated with the spiral oil groove A, the upper end of the oil duct extends to the upper supporting shaft, an oil hole communicated with the oil duct is formed in the outer wall of the upper supporting shaft, a communicating hole communicated with the oil duct is formed in the outer wall of the eccentric shaft, and a transversely-arranged oil storage groove is formed in the position, corresponding to the communicating hole, of the outer wall face of the eccentric shaft; the service life of the commercial compressor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of reciprocating piston refrigeration compressors, in particular to a double-support crankshaft and a commercial compressor with increased lubricating oil quantity. Background Art

[0002] Existing large-scale commercial compressors mostly use R290 working fluid, which has the characteristics of high ambient temperature, large load, and large heat generation of the compressor. Its crankshaft generally adopts a double-support structure. The crankshaft is the core moving component of the compressor. During operation, the refrigeration oil is circulated between the moving parts through the oil tank, which not only plays the role of lubricating the parts, but also allows the refrigeration oil to cool down the various components to avoid deformation caused by excessive temperature of the components, which may cause the compressor to jam. When the compressor is started and stopped, the crankshaft of the existing structure pumps oil from bottom to top and guides the oil to the moving pair to form an oil film. However, in this process, the compressor will temporarily lack oil, especially the eccentric shaft, which will often wear due to lack of oil. Even if there is no oil shortage problem in the future, the location of the wear will gradually deteriorate with the running time of the compressor, eventually causing damage to the compressor. Summary of the invention

[0003] The purpose of the utility model is to solve the problems existing in the above-mentioned existing commercial compressors and to provide a double-supported crankshaft and a commercial compressor that can increase the amount of lubricating oil.

[0004] The specific scheme of the utility model is: a double-support crankshaft for increasing the amount of lubricating oil, comprising a long shaft, an eccentric shaft and an upper support shaft arranged in sequence from bottom to top, the long shaft and the upper support shaft are coaxially arranged, an eccentric distance is provided between the eccentric shaft and the long shaft, a spiral oil groove A is provided on the outer wall surface of the long shaft, a spiral oil groove B is provided on the outer wall surface of the eccentric shaft, an oil channel is provided inside the eccentric shaft, the bottom end of the oil channel is connected with the spiral oil groove A, the upper end of the oil channel extends to the upper support shaft, the outer wall of the upper support shaft is provided with an oil hole connected with the oil channel, the outer wall of the eccentric shaft is provided with a connecting hole connected with the oil channel, and a transversely arranged oil storage tank is provided on the outer wall surface of the eccentric shaft corresponding to the connecting hole.

[0005] Furthermore, the oil storage tank is connected to the spiral oil tank B.

[0006] Furthermore, the depth of the oil storage tank is greater than that of the spiral oil tank B.

[0007] Furthermore, the angle between the two sides of the spiral oil groove A and the outer wall surface of the long axis is greater than 120°.

[0008] Furthermore, the angle between the two sides of the spiral oil groove B and the outer wall surface of the eccentric shaft is greater than 120°.

[0009] Furthermore, a balancing block is provided between the upper support shaft and the eccentric shaft, and the balancing block is used to balance the centrifugal force of the eccentric shaft.

[0010] Furthermore, the utility model also provides a commercial compressor equipped with the above-mentioned double-supported crankshaft.

[0011] Compared with the prior art, the utility model has the following advantages: 1. By machining a transverse oil storage groove on the eccentric shaft, the lubricating oil can be stored in the oil storage groove when the compressor is running, thereby avoiding wear due to lack of oil and extending the service life of the compressor; 2. A large obtuse angle is formed at the junction of the oil groove and the outer circle of the crankshaft. It is not easy to form a sharp angle during the machining of the oil groove, which is convenient for removing burrs during brushing and avoiding burrs remaining on the crankshaft, causing scratches and wear of the operating parts of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view of the double-support crankshaft of the utility model;

[0013] Figure 2 yes Figure 1 Side view of

[0014] Figure 3 yes Figure 2 AA view;

[0015] Figure 4 yes Figure 1 BB view;

[0016] Figure 5 yes Figure 3 A magnified view of the V position;

[0017] Figure 6 yes Figure 2 A magnified view at X;

[0018] In the figure: 1. long shaft; 2. eccentric shaft; 3. upper support shaft; 4. balancing block; 5. spiral oil groove B; 6. oil storage tank; 7. spiral oil groove A; 8. oil hole; 9. oil channel; 10. connecting hole. DETAILED DESCRIPTION

[0019] See also Figure 1-6 The present embodiment is a double-support crankshaft for increasing the amount of lubricating oil, comprising a long shaft 1, an eccentric shaft 2 and an upper support shaft 3 arranged in sequence from bottom to top, the long shaft 1 and the upper support shaft 3 are coaxially arranged, an eccentric distance is provided between the eccentric shaft 2 and the long shaft 1, a spiral oil groove A7 is provided on the outer wall surface of the long shaft 1, a spiral oil groove B5 is provided on the outer wall surface of the eccentric shaft 2, an oil passage 9 is provided inside the eccentric shaft 2, the bottom end of the oil passage 9 is connected to the spiral oil groove A7, the upper end of the oil passage 9 extends to the upper support shaft 3, an oil hole 8 connected to the oil passage 9 is provided on the outer wall of the upper support shaft 3, a connecting hole 10 connected to the oil passage 9 is provided on the outer wall of the eccentric shaft 2, and a transversely arranged oil storage tank 6 is provided on the outer wall surface of the eccentric shaft 2 corresponding to the connecting hole 10.

[0020] Furthermore, the oil storage tank 6 is connected to the spiral oil tank B5.

[0021] Furthermore, the depth of the oil storage tank 6 is greater than that of the spiral oil tank B5.

[0022] Furthermore, the angle between the two sides of the spiral oil groove A7 and the outer wall surface of the long axis 1 is greater than 120°.

[0023] Furthermore, the angle between the two sides of the spiral oil groove B5 and the outer wall surface of the eccentric shaft 2 is greater than 120°.

[0024] Furthermore, a balancing block 4 is provided between the upper support shaft 3 and the eccentric shaft 2 , and the balancing block 4 is used to balance the centrifugal force of the eccentric shaft 2 .

[0025] Furthermore, this embodiment also provides a commercial compressor equipped with the above-mentioned double-supported crankshaft.

[0026] The working principle of the utility model is as follows: the crankshaft and the connecting rod are assembled, and the oil storage tank 6 is arranged horizontally, so the oil storage tank 6 is completely covered by the connecting rod, and a relatively closed oil storage chamber is formed between the oil storage tank 6 and the inner wall of the connecting rod. During the operation of the compressor, the long shaft 1 absorbs the lubricating oil upward and rises along the spiral oil groove A7 to the oil channel 9, and then distributes it to the eccentric shaft 2 and the upper support shaft 3 through the oil channel 9. A part of the lubricating oil in the oil channel 9 flows into the spiral oil groove B5 and the oil storage chamber through the connecting hole 10. Therefore, when the compressor stops running, the oil in the oil storage chamber still remains. When the compressor is started again, the lubricating oil in the oil storage chamber can lubricate the eccentric shaft 2 and the connecting rod in time without waiting for the long shaft 1 below to pump up the lubricating oil. This reduces the possibility of wear of the eccentric shaft 2 and the connecting rod and increases the service life of the compressor.

Claims

1. A double-support crankshaft for increasing the amount of lubricating oil, comprising a long shaft, an eccentric shaft and an upper support shaft arranged in sequence from bottom to top, the long shaft and the upper support shaft are arranged coaxially, an eccentric distance is provided between the eccentric shaft and the long shaft, a spiral oil groove A is provided on the outer wall of the long shaft, and a spiral oil groove B is provided on the outer wall of the eccentric shaft, wherein: An oil passage is provided inside the eccentric shaft, the bottom end of the oil passage is connected to the spiral oil groove A, the upper end of the oil passage extends to the upper support shaft, the outer wall of the upper support shaft is provided with an oil hole connected to the oil passage, the outer wall of the eccentric shaft is provided with a connecting hole connected to the oil passage, and a transversely arranged oil storage groove is provided on the outer wall of the eccentric shaft corresponding to the connecting hole.

2. A double-support crankshaft for increasing the amount of lubricating oil according to claim 1, characterized in that: The oil storage tank is connected with the spiral oil tank B.

3. A double-support crankshaft for increasing the amount of lubricating oil according to claim 2, characterized in that: The depth of the oil storage tank is greater than that of the spiral oil tank B.

4. A double-support crankshaft for increasing the amount of lubricating oil according to claim 1, characterized in that: The angle between the two sides of the spiral oil groove A and the outer wall surface of the long axis is greater than 120°.

5. A double-support crankshaft for increasing the amount of lubricating oil according to claim 1, characterized in that: The angle between the two sides of the spiral oil groove B and the outer wall surface of the eccentric shaft is greater than 120°.

6. A double-support crankshaft for increasing the amount of lubricating oil according to claim 1, characterized in that: A balancing block is arranged between the upper supporting shaft and the eccentric shaft, and the balancing block is used to balance the centrifugal force of the eccentric shaft.

7. A commercial compressor, characterized in that: Equipped with a double-supported crankshaft as described in any one of claims 1-6.

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