Crankshaft thrust structure and compressor

Abstract

The application provides a crankshaft thrust structure and a compressor, which comprises a crankshaft, a piston and a thrust part. The piston is sleeved on the crankshaft. The thrust part is provided with an upper end face. The upper end face is provided with a insertion hole. The outer circumference of the insertion hole is provided with an annular groove. The insertion hole and the annular groove are provided with an upper thrust face. The height of the upper thrust face is lower than the height of the upper end face. The crankshaft is provided with a lower thrust face. The piston is provided with a lower end face. The crankshaft is rotatably inserted into the insertion hole of the thrust part. When the crankshaft rotates, the lower thrust face of the crankshaft slides along the upper thrust face of the thrust part, and the lower end face of the piston slides along the upper end face of the thrust part. The application reduces the friction pairs of the thrust part, is beneficial to reduce the abnormal wear in the pump body, reduce the input of the compressor, improve the performance and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of compressor, in particular, to a crankshaft thrust structure and compressor for reducing abrasion. BACKGROUND

[0002] Rotary compressor is a new type of compressor, the motor does not need to convert the rotary motion of the rotor into reciprocating motion of the piston, but directly drives the rotary piston to rotate to complete the compression of the refrigerant vapor. This air compressor is more suitable for small air conditioners, especially in the application of household air conditioners. The rotary air compressors produced by General Electric Company and WOOP Company are designed with good anti-overheating and lubrication device. It uses the cooling method of introducing part of the refrigerant at the condenser to the compression chamber through a pipe to spray in the cylinder, which improves the cooling effect.

[0003] The main advantages of rotary compressor are: the piston rotates, the compression work is smooth and stable, and the balance is good. In addition, the rotary air compressor has no residual volume, and there is no interference of re-expanding gas, so it has the advantages of high compression efficiency, fewer parts, small size, light weight, good balance performance, complete protection measures and low power consumption.

[0004] Double-rotor compressor refers to a compressor composed of two rotors, which has the advantages of low frequency energy efficiency ratio, but has large noise, vibration and abrasion, and short service life.

[0005] As shown in Figure 1 , the crankshaft of the large-specification double-cylinder rotor compressor pump body is thrust by the lower plane of the crankshaft and the inner plane of the lower cylinder cover ring groove. In this case, there are three pairs of friction pairs, namely: the lower plane 1 of the crankshaft and the inner plane 2 of the lower cylinder cover ring groove; the lower plane 3 of the piston and the inner plane 2 of the lower cylinder cover ring groove; the lower plane 3 of the piston and the lower cylinder cover plane 4.

[0006] As shown in Figure 2 , through a large number of experiments, it is found that the crankshaft of the compressor pump body deforms during operation, which increases the abrasion between the lower plane 3 of the piston and the inner plane 2 of the lower cylinder cover ring groove.

[0007] Therefore, the person skilled in the art is committed to developing a compressor that is beneficial to reducing abrasion, improving performance and reliability. SUMMARY

[0008] In view of the problems in the prior art, the purpose of the present application is to provide a crankshaft thrust structure and compressor, which reduces the friction pairs of the thrust part, is beneficial to reducing the abnormal abrasion in the pump body, reducing the input of the compressor, improving the performance and reliability, and is beneficial to oil storage in the ring groove, improving shaft lubrication, and reducing abrasion.

[0009] According to one aspect of the present application, a crankshaft thrust structure is provided, comprising a crankshaft, a piston and a thrust part, the piston is sleeved on the crankshaft, the thrust part is provided with an upper end face, the upper end face is provided with a socket, the outer circumference of the socket is provided with an annular groove, the socket and the annular groove are provided with an upper thrust face, the height of the upper thrust face is lower than the height of the upper end face, the crankshaft is provided with a lower thrust face, the piston is provided with a lower end face, the crankshaft is rotatably inserted into the socket of the thrust part, when the crankshaft rotates, the lower thrust face of the crankshaft slides along the upper thrust face of the thrust part, and the lower end face of the piston slides along the upper end face of the thrust part.

[0010] Preferably, the crankshaft is in clearance fit between the annular groove of the thrust part and the socket wall.

[0011] Preferably, the height difference between the upper end face and the upper thrust face of the thrust part is 0.5-2mm.

[0012] Preferably, the height difference between the upper end face and the upper thrust face of the thrust part is 1.2-1.6mm.

[0013] Preferably, the thrust part is a lower cylinder head.

[0014] Preferably, the socket of the thrust part is a through hole, and the crankshaft is rotatably inserted into the through hole.

[0015] Preferably, the annular groove is provided with lubricating oil.

[0016] Preferably, the upper end face, the upper thrust face, the lower end face and the lower thrust face are all planes, preferably horizontal planes.

[0017] According to another aspect of the present application, a compressor is provided, comprising the above-mentioned crankshaft thrust structure.

[0018] Preferably, the compressor is a rotary compressor.

[0019] Preferably, the compressor is a double-cylinder rotary compressor.

[0020] The crankshaft thrust structure and the compressor of the present application reduce the friction pair of the thrust part, which is beneficial to reduce the abnormal wear in the pump body, reduce the input of the compressor, improve the performance and reliability, and is beneficial to store oil in the annular groove, improve the lubrication of the shafting, and reduce the wear. BRIEF DESCRIPTION OF DRAWINGS

[0021] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings.

[0022] Figure 1 is a structural schematic diagram of a compressor of the prior art;

[0023] Figure 2 is a schematic view of a wear structure of a compressor of the prior art;

[0024] Figure 3 is a schematic view of a structure of a crankshaft thrust structure of an embodiment of the present application;

[0025] Figure 4 is a schematic view of a structure of a crankshaft thrust structure of an embodiment of the present application in a deformed state.

[0026] Reference Signs

[0027] 1 lower surface of a crankshaft of the prior art

[0028] 2 inner surface of a lower cylinder head ring groove of the prior art

[0029] 3 lower surface of a piston of the prior art

[0030] 4 lower surface of a cylinder head of the prior art

[0031] 5 crankshaft

[0032] 51 lower thrust surface

[0033] 6 piston

[0034] 61 lower end surface

[0035] 7 thrust portion

[0036] 71 insertion hole

[0037] 72 annular groove

[0038] 73 upper end surface

[0039] 74 upper thrust surface DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein. Rather, these implementations are provided as example embodiments so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art. Like reference numerals refer to like elements throughout the several views of the drawings, and thus description of the same will be simplified or omitted in some instances.

[0041] As shown in Figure 3 In an embodiment of the present application, a crankshaft thrust structure and a compressor, preferably a rotary type rotor compressor, and preferably a double cylinder rotor compressor, are provided.

[0042] The crankshaft thrust structure includes a crankshaft 5, a piston 6, and a thrust portion 7.

[0043] The crankshaft 5 is substantially cylindrical in shape and is pivotable about an axis of rotation which is substantially centrally located with respect to the crankshaft 5. The piston 6 is substantially annular in shape. The piston 6 is fitted over the crankshaft 5 and rotates in the cylinder in conjunction with the rotation of the crankshaft 5 to perform work on the gas in the cylinder.

[0044] The thrust portion 7 is fixed with respect to the rotating crankshaft 5 and is used to secure the position of the crankshaft 5 from below, preferably the lower cylinder head of the compressor cylinder. The thrust portion 7 is provided with a receptacle 71, preferably a through hole, into which the crankshaft 5 is inserted and can rotate.

[0045] At the same time, in order to lubricate the friction surface, an annular groove 72 is provided on the outer circumference of the receptacle 71, in which lubricating oil is stored.

[0046] In addition, the thrust portion 7 is provided with an upper end surface 73 with respect to the position of the piston 6. The piston 6 is provided with a lower end surface 61. The lower end surface 61 is in contact with the upper end surface 73 and slides along the upper end surface 73 when the piston 6 rotates.

[0047] As shown in Figure 3 , in the embodiment of the present application, an upper thrust surface 74 is provided on the annular groove block between the receptacle 71 and the annular groove 72 of the thrust portion 7. The crankshaft 5 is provided with a lower thrust surface 51 which is in contact with the upper thrust surface 74 and slides along the upper thrust surface 74 when the crankshaft 5 rotates.

[0048] As shown in Figure 3 , in the embodiment of the present application, the height of the upper thrust surface 74 is lower than the height of the upper end surface 73, and correspondingly the height of the lower thrust surface 51 is lower than the height of the lower end surface 61, i.e. the upper thrust surface 74 of the thrust portion 7 is not in contact with the lower end surface 61 of the piston 6, and no friction occurs between the upper thrust surface 74 and the lower end surface 61.

[0049] The embodiment of the present application reduces the height of the plane of the annular groove block in the annular groove of the thrust portion, increases the length of the lower thrust surface of the crankshaft, so that the lower end surface of the piston does not come into contact with the plane in the annular groove during the operation of the compressor, and the friction pair of the thrust portion is reduced, i.e. there are only two friction pairs: the lower end surface of the piston and the plane of the lower cylinder head; the lower thrust surface of the crankshaft and the plane in the annular groove of the lower cylinder head, which is beneficial to reduce abnormal wear in the pump body, reduce the input of the compressor, improve performance and reliability. After the change, it is also beneficial to store oil in the annular groove, improve the lubrication of the shafting, and reduce wear.

[0050] It should be noted that in the present application, "height" refers to the distance from bottom to top when the embodiment of the present application is placed as shown in Figure 3 , "height difference" refers to the distance between the upper and lower as shown in Figure 3 , and "low" refers to being located Figure 3"high" means the opposite position to the lower position shown in the figure Figure 3 "high" means the opposite position to the lower position shown in the figure

[0051] As shown in the figure Figure 3 In the embodiment of the present application, preferably, the upper thrust surface 74, the upper end surface 73, the lower thrust surface 51 and the lower end surface 61 are all flat surfaces, and preferably, are horizontal flat surfaces.

[0052] In the embodiment of the present application, preferably, the crankshaft 5 is in clearance fit with the groove wall of the annular groove 72 of the thrust portion 7, that is, the crankshaft 5 does not contact the groove wall of the annular groove 72 and does not generate horizontal friction.

[0053] In addition, in the embodiment of the present application, according to the thickness depth and the aspect ratio of the annular groove 72, the height difference distance between the upper end surface 73 and the upper thrust surface 74 of the thrust portion 7 is 0.5-2mm, preferably, 1.2-1.6mm.

[0054] In addition, as shown in the figure Figure 4 In addition, as shown in the figure

[0055] The present application is described below with specific embodiments:

[0056] Embodiment 1

[0057] As shown in the figure Figure 3 A compressor crankshaft thrust structure, comprising a crankshaft 5, a piston 6 and a thrust portion 7.

[0058] The thrust portion 7 is provided with a plug hole 71, and the crankshaft 5 is inserted into the plug hole 71 and can rotate in the plug hole 71. An annular groove 72 is provided on the outer circumference of the plug hole 71 of the thrust portion 7, and lubricating oil is stored in the annular groove 72.

[0059] An upper thrust surface 74 is provided on the annular groove wall block between the plug hole 71 and the annular groove 72 of the thrust portion 7. The crankshaft 5 is provided with a lower thrust surface 51, which contacts the upper thrust surface 74 and slides along the upper thrust surface 74 when the crankshaft 5 rotates.

[0060] The piston 6 is sleeved on the crankshaft 5, and the piston 6 rotates in the cylinder along with the rotation of the crankshaft 5.

[0061] The thrust portion 7 is provided with an upper end surface 73 relative to the position of the piston 6. The piston 6 is provided with a lower end surface 61. The lower end surface 61 contacts the upper end surface 73 and slides along the upper end surface 73 when the piston 6 rotates.

[0062] The height of the upper thrust surface 74 is 0.5 mm lower than the height of the upper end surface 73, and the height of the lower thrust surface 51 is 0.5 mm lower than the height of the lower end surface 61. The upper thrust surface 74 of the thrust portion 7 does not contact the lower end surface 61 of the piston 6, and no friction occurs between the upper thrust surface 74 and the lower end surface 61.

[0063] The thickness of the annular groove 72 is 0.8 mm.

[0064] Example 2

[0065] As shown in Figure 3 A compressor crankshaft thrust structure includes a crankshaft 5, a piston 6, and a thrust portion 7.

[0066] The thrust portion 7 is provided with a hole 71 into which the crankshaft 5 is inserted and can rotate. An annular groove 72 is provided on the outer circumference of the hole 71 of the thrust portion 7, and lubricating oil is stored in the annular groove 72.

[0067] The hole 71 of the thrust portion 7 and the annular groove 72 are provided with an upper thrust surface 74. The crankshaft 5 is provided with a lower thrust surface 51 that contacts the upper thrust surface 74 and slides along the upper thrust surface 74 when the crankshaft 5 rotates.

[0068] The piston 6 is fitted on the crankshaft 5, and the piston 6 rotates in the cylinder along with the rotation of the crankshaft 5.

[0069] The thrust portion 7 is provided with an upper end surface 73 at a position relative to the piston 6. The piston 6 is provided with a lower end surface 61. The lower end surface 61 contacts the upper end surface 73 and slides along the upper end surface 73 when the piston 6 rotates.

[0070] The height of the upper thrust surface 74 is 1.2 mm lower than the height of the upper end surface 73, and the height of the lower thrust surface 51 is 0.5 mm lower than the height of the lower end surface 61. The upper thrust surface 74 of the thrust portion 7 does not contact the lower end surface 61 of the piston 6, and no friction occurs between the upper thrust surface 74 and the lower end surface 61.

[0071] The thickness of the annular groove 72 is 1.3 mm.

[0072] Example 3

[0073] As shown in Figure 3 A compressor crankshaft thrust structure includes a crankshaft 5, a piston 6, and a thrust portion 7.

[0074] The thrust portion 7 is provided with a hole 71 into which the crankshaft 5 is inserted and can rotate. An annular groove 72 is provided on the outer circumference of the hole 71 of the thrust portion 7, and lubricating oil is stored in the annular groove 72.

[0075] An upper thrust surface 74 is provided on the ring groove block between the insertion hole 71 and the annular groove 72 of the thrust portion 7. A lower thrust surface 51 is provided on the crankshaft 5, and the lower thrust surface 51 is in contact with the upper thrust surface 74 and slides along the upper thrust surface 74 when the crankshaft 5 rotates.

[0076] The piston 6 is fitted on the crankshaft 5, and the piston 6 rotates in the cylinder along with the rotation of the crankshaft 5.

[0077] An upper end surface 73 is provided on the thrust portion 7 with respect to the piston 6. A lower end surface 61 is provided on the piston 6. The lower end surface 61 is in contact with the upper end surface 73 and slides along the upper end surface 73 when the piston 6 rotates.

[0078] The height of the upper thrust surface 74 is 1.6 mm lower than the height of the upper end surface 73, and the height of the lower thrust surface 51 is 0.5 mm lower than the height of the lower end surface 61. The upper thrust surface 74 of the thrust portion 7 is not in contact with the lower end surface 61 of the piston 6, and no friction occurs between the upper thrust surface 74 and the lower end surface 61.

[0079] The thickness of the annular groove 72 is 1.55 mm.

[0080] Example 4

[0081] As shown in Figure 3 A compressor crankshaft thrust structure includes a crankshaft 5, a piston 6, and a thrust portion 7.

[0082] An insertion hole 71 is provided on the thrust portion 7, and the crankshaft 5 is inserted into the insertion hole 71 and can rotate in the insertion hole 71. An annular groove 72 is provided on the outer circumference of the insertion hole 71 of the thrust portion 7, and lubricating oil is stored in the annular groove 72.

[0083] An upper thrust surface 74 is provided on the ring groove block between the insertion hole 71 and the annular groove 72 of the thrust portion 7. A lower thrust surface 51 is provided on the crankshaft 5, and the lower thrust surface 51 is in contact with the upper thrust surface 74 and slides along the upper thrust surface 74 when the crankshaft 5 rotates.

[0084] The piston 6 is fitted on the crankshaft 5, and the piston 6 rotates in the cylinder along with the rotation of the crankshaft 5.

[0085] An upper end surface 73 is provided on the thrust portion 7 with respect to the piston 6. A lower end surface 61 is provided on the piston 6. The lower end surface 61 is in contact with the upper end surface 73 and slides along the upper end surface 73 when the piston 6 rotates.

[0086] The height of the upper thrust surface 74 is 2 mm lower than the height of the upper end surface 73, and the height of the lower thrust surface 51 is 0.5 mm lower than the height of the lower end surface 61. The upper thrust surface 74 of the thrust portion 7 is not in contact with the lower end surface 61 of the piston 6, and no friction occurs between the upper thrust surface 74 and the lower end surface 61.

[0087] The thickness of the annular groove 72 is 1.8 mm.

[0088] In summary, the crankshaft thrust structure and the compressor of the embodiment of the present application reduce the friction pair of the thrust part, which is conducive to reducing the abnormal wear in the pump body, reducing the input of the compressor, improving the performance and reliability, and is conducive to oil storage in the annular groove, improving shaft system lubrication, and reducing wear.

[0089] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be considered as falling within the protection scope of the present application.

Claims

1. A crankshaft thrust structure characterized by comprising: The crankshaft (5) includes a piston (6) and a thrust portion (7), the piston (6) is sleeved on the crankshaft (5), the thrust portion (7) is provided with an upper end face (73), the upper end face (73) is provided with a insertion hole (71), the outer circumference of the insertion hole (71) is provided with an annular groove (72), the insertion hole (71) and the annular groove (72) are provided with an upper thrust face (74), the height of the upper thrust face (74) is lower than the height of the upper end face (73), the crankshaft (5) is provided with a lower thrust face (51), the piston (6) is provided with a lower end face (61), the crankshaft (5) is rotatably inserted into the insertion hole (71) of the thrust portion (7), the annular groove (72) is provided with lubricating oil, the thickness of the annular groove (72) is 0.8-1.8mm, when the crankshaft (5) rotates, the lower thrust face (51) of the crankshaft (5) slides along the upper thrust face (74) of the thrust portion (7), and the lower end face (61) of the piston (6) slides along the upper end face (73) of the thrust portion (7).

2. The crankshaft thrust structure according to claim 1, characterized by: The crankshaft (5) is in clearance fit between the annular groove (72) of the thrust portion (7) and the groove wall.

3. The crankshaft thrust structure according to claim 1, characterized by: The height difference between the upper end face (73) and the upper thrust face (74) of the thrust portion (7) is 0.5-2mm.

4. The crankshaft thrust structure of claim 1 wherein: The height difference between the upper end face (73) and the upper thrust face (74) of the thrust portion (7) is 1.2-1.6mm.

5. The crankshaft thrust structure of claim 1 wherein: The thrust portion (7) is a lower cylinder cover.

6. The crankshaft thrust structure of claim 1 wherein: The insertion hole (71) of the thrust portion (7) is a through hole, and the crankshaft (5) is rotatably inserted into the through hole.

7. The crankshaft thrust structure of claim 1 wherein: The upper end face (73), the upper thrust face (74), the lower end face (61) and the lower thrust face (51) are all planes.

8. A compressor characterized by: The crankshaft thrust structure comprises the crankshaft thrust structure according to any one of claims 1-7.

9. The compressor of claim 8, wherein: The compressor is a rotary compressor.

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