CN212508831U

CN212508831U - Crankshaft thrust structure and compressor

Info

Publication number: CN212508831U
Application number: CN202021740711.XU
Authority: CN
Inventors: 耿樵; 魏巍; 马敏
Original assignee: Shanghai Highly Electrical Appliances Co Ltd
Current assignee: Shanghai Highly Electrical Appliances Co Ltd
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2021-02-09
Anticipated expiration: 2030-08-19

Abstract

The utility model provides a bent axle thrust structure and compressor, including bent axle, piston and thrust portion, the piston cover is located on the bent axle, is equipped with the up end in the thrust portion, is equipped with the jack on the up end, and the outer circumference of jack is equipped with the ring channel, is equipped with the top thrust face between jack and the ring channel, and the height that highly is less than the up end of top thrust face goes up the thrust face, is equipped with down the thrust face on the bent axle, is equipped with down the terminal surface on the piston, and the bent axle is rotatable in inserting the jack of thrust portion, and when the bent axle is rotatory, the thrust face slides along the top thrust face in the thrust portion under the bent axle, and. The utility model discloses it is vice to have reduced thrust portion friction, is favorable to reducing the unusual wearing and tearing in the pump body, reduces the compressor entry, improves performance and reliability.

Description

Crankshaft thrust structure and compressor

Technical Field

The utility model relates to a compressor field, specifically speaking relates to a reduce bent axle thrust structure and compressor of wearing and tearing.

Background

The rotary compressor is a new type of compressor, and its motor does not need to convert the rotary motion of rotor into reciprocating motion of piston, but directly drives the rotary piston to make rotary motion to complete the compression of refrigerant vapor. The air compressor is more suitable for small air conditioners, and particularly has wider application on household air conditioners. For example, rotary air compressors manufactured by U.S. general electric and vopp have been designed with better anti-overheating and lubrication devices. It adopts the cooling mode of leading part of refrigerant liquid in condenser to compression chamber by using pipe to make it be injected in cylinder, so that its cooling effect can be raised.

The rotary compressor has the main advantages that: because the piston does the rotary motion, the compression work is smooth and stable and balanced. In addition, the rotary air compressor has no clearance volume and no interference of re-expansion gas, so that the rotary air compressor has the advantages of high compression efficiency, few parts, small volume, light weight, good balance performance, complete protection measures, low power consumption and the like.

The double-rotor compressor is composed of two rotors, has the advantage of good low-frequency energy efficiency ratio, but has larger noise vibration abrasion and short service life.

As shown in figure 1, the crankshaft of the pump body of the current large-specification double-cylinder rotor compressor carries out thrust through the lower plane of the crankshaft and the inner plane of the annular groove of the lower cylinder cover. In this case, there are three pairs of friction pairs, namely: a crankshaft lower plane 1 and a lower cylinder head ring groove inner plane 2; a piston lower plane 3 and a lower cylinder cover ring groove inner plane 2; a piston lower plane 3 and a lower cylinder cover plane 4.

And as shown in fig. 2, through a large number of experiments, it is found that the crankshaft has a certain deformation during the operation of the compressor pump body, so that the abrasion between the lower plane 3 of the piston and the plane 2 in the lower cylinder head ring groove is increased.

To this end, those skilled in the art have endeavored to develop a compressor that is advantageous in reducing wear and improving performance and reliability.

SUMMERY OF THE UTILITY MODEL

To the problem among the prior art, the utility model aims to provide a bent axle thrust structure and compressor has reduced the vice friction of thrust portion, is favorable to reducing the internal unusual wearing and tearing of pump, reduces the compressor entry, improves performance and reliability to be favorable to the annular in the oil storage, improve the shafting lubrication, reduce wearing and tearing.

According to the utility model discloses an aspect provides a bent axle thrust structure, including bent axle, piston and thrust portion, the piston cover is located on the bent axle, be equipped with the up end in the thrust portion, be equipped with the jack on the up end, the outer circumference of jack is equipped with the ring channel, be equipped with the top thrust face between jack and the ring channel, the height that highly is less than of top thrust face the height of up end, be equipped with thrust face down on the bent axle, the terminal surface is down gone up on the piston, the rotatable inserting of bent axle in the jack of thrust portion, work as when the bent axle is rotatory, thrust face follows under the bent axle the thrust face slides in the thrust portion, the terminal surface slides along the thrust portion up end under the piston.

Preferably: and the crankshaft is in clearance fit with the groove wall of the annular groove of the thrust part.

Preferably: the height difference between the upper end surface of the thrust part and the upper thrust surface is 0.5-2 mm.

Preferably: the height difference between the upper end surface of the thrust part and the upper thrust surface is 1.2-1.6 mm.

Preferably: the thrust part is a lower cylinder cover.

Preferably: the insertion hole of the thrust part is a through hole, and the crankshaft is rotatably inserted into the through hole.

Preferably: and lubricating oil is arranged in the annular groove.

Preferably: the upper end face, the upper thrust face, the lower thrust face and the lower thrust face are all planes, and are preferably horizontal planes.

According to another aspect of the present invention, there is provided a compressor, including the above crankshaft thrust structure.

Preferably: the compressor is a rotor compressor.

Preferably: the compressor is a double-cylinder rotor compressor.

The utility model discloses a bent axle thrust structure and compressor has reduced the vice friction of thrust portion, is favorable to reducing the internal unusual wearing and tearing of pump, reduces the compressor entry, improves performance and reliability to be favorable to the annular in the oil storage, improve the shafting lubrication, reduce the wearing and tearing.

Drawings

Other features, objects and advantages of the invention will become more apparent from a reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

FIG. 1 is a schematic view of a compressor according to the prior art;

FIG. 2 is a schematic view of a wear structure of a compressor of the prior art;

fig. 3 is a schematic structural view of a crankshaft thrust structure according to an embodiment of the present invention;

fig. 4 is a schematic structural view of the crankshaft thrust structure according to the embodiment of the present invention when deformed.

Reference numerals

1 prior art lower plane of crankshaft 1

2 inner plane 2 of cylinder head ring groove in prior art

3 lower piston plane 3 of the prior art

4 lower cylinder head plane 4 of the prior art

5 crankshaft

51 lower thrust surface

6 piston

61 lower end surface

7 thrust part

71 jack

72 annular groove

73 upper end face

74 top thrust surface

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.

As shown in fig. 3, in an embodiment of the present invention, a crankshaft thrust structure and a compressor, preferably a rotary rotor compressor, and preferably a two-cylinder rotor compressor, are provided.

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

The crankshaft 5 is substantially cylindrical in shape and is pivotable about a rotational axis which is substantially located at the centre line of the crankshaft 5. The piston 6 is substantially annular in shape. 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, so that work is performed on gas in the cylinder.

The thrust part 7 is fixed to the rotating crankshaft 5, and is preferably a lower head of a compressor cylinder for fixing the position of the crankshaft 5 from below. The thrust portion 7 is provided with an insertion hole 71, preferably a through hole, into which the crankshaft 5 is inserted and is rotatable in the insertion hole 71.

Meanwhile, in order to lubricate the frictional surfaces, an annular groove 72 is provided at the outer circumference of the insertion hole 71, and lubricating oil is stored in the annular groove 72.

The thrust portion 7 has an upper end surface 73 at a position opposite 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 frictionally along the upper end surface 73 when the piston 6 rotates.

As shown in fig. 3, in the embodiment of the present invention, an upper thrust surface 74 is provided on the annular groove wall block between the insertion hole 71 and the annular groove 72 of the thrust portion 7. The crankshaft 5 is provided with a lower thrust surface 51, and the lower thrust surface 51 contacts the upper thrust surface 74 and slides along the upper thrust surface 74 in a friction manner when the crankshaft 5 rotates.

As shown in fig. 3, in the embodiment of the present invention, the height of the upper thrust surface 74 is lower than that of the upper end surface 73, and the height of the corresponding lower thrust surface 51 is lower than that of the lower end surface 61, that is, 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 is generated between the upper thrust surface 74 and the lower end surface 61.

The embodiment of the utility model provides a plane height through reducing the annular wall piece in the thrust portion annular increases thrust surface length under the bent axle for terminal surface can not with the interior plane contact of annular under the piston operation in-process, makes the vice reduction of thrust portion friction, and the friction is vice only two promptly: the lower end surface of the piston and the plane of the lower cylinder cover; the crankshaft thrust surface and the inner plane of the lower cylinder cover ring groove are beneficial to reducing abnormal abrasion in the pump body, reducing the input force of the compressor and improving the performance and reliability. After the change, the oil storage in the ring groove is facilitated, the shafting lubrication is improved, and the abrasion is reduced.

It should be noted that, in the present invention, "height" refers to the distance from bottom to top when the embodiment of the present invention as shown in fig. 3 is placed, "height difference" is the distance between top and bottom as shown in fig. 3, "low" is relatively located at the lower position as shown in fig. 3, and "high" is relatively located at the upper position as shown in fig. 3.

As shown in fig. 3, in the embodiment of the present invention, the upper thrust surface 74, the upper end surface 73, the lower thrust surface 51, and the lower end surface 61 are preferably flat surfaces, and are preferably horizontal flat surfaces.

In the embodiment of the present invention, it is preferable that the crankshaft 5 and the wall of the annular groove 72 of the thrust portion 7 are in clearance fit, that is, the crankshaft 5 does not contact the wall of the annular groove 72, and friction in the horizontal direction is not generated.

Further, in the embodiment of the present invention, the height difference distance between the upper end surface 73 of the thrust portion 7 and the upper thrust surface 74 is 0.5 to 2mm, preferably 1.2 to 1.6mm, depending on the thickness depth and the aspect ratio of the annular groove 72.

In addition, as shown in fig. 4, during the operation of the compressor, the wall block of the annular groove is deformed to generate an inclination angle a due to a certain deflection caused by the deformation of the shafting, and at this time, the thickness of the annular groove 72 should be ensured, preferably 0.8-1.8mm, and more preferably 1.3-1.55mm, so as to prevent the lower thrust surface 51 of the crankshaft 5 from touching the wall of the annular groove 72.

The invention is described below in terms of specific embodiments:

example 1

As shown in fig. 3, a compressor crankshaft thrust structure includes a crankshaft 5, a piston 6, and a thrust portion 7.

The thrust portion 7 is provided with an insertion hole 71, and the crankshaft 5 is inserted into the insertion hole 71 and is rotatable in the insertion hole 71. An annular groove 72 is provided in the outer circumference of the insertion hole 71 of the thrust portion 7, and lubricating oil is stored in the annular groove 72.

An upper thrust surface 74 is arranged on the ring groove wall block between the insertion hole 71 and the ring groove 72 of the thrust part 7. The crankshaft 5 is provided with a lower thrust surface 51, and the lower thrust surface 51 contacts the upper thrust surface 74 and slides along the upper thrust surface 74 in a friction manner when the crankshaft 5 rotates.

The piston 6 is fitted over the crankshaft 5, and the piston 6 rotates in the cylinder with the rotation of the crankshaft 5.

The height of the upper thrust surface 74 lower than the height of the upper end surface 73 is 0.5mm, and the height of the lower thrust surface 51 lower than the height of the lower end surface 61 is 0.5 mm. The upper thrust surface 74 of the thrust portion 7 does not contact the lower end surface 61 of the piston 6, and friction is not generated between the upper thrust surface 74 and the lower end surface 61.

The thickness of the annular groove 72 is 0.8 mm.

Example 2

The height of the upper thrust surface 74 lower than the height of the upper end surface 73 is 1.2mm, and the height of the lower thrust surface 51 lower than the height of the lower end surface 61 is 0.5 mm. The upper thrust surface 74 of the thrust portion 7 does not contact the lower end surface 61 of the piston 6, and friction is not generated between the upper thrust surface 74 and the lower end surface 61.

The thickness of the annular groove 72 is 1.3 mm.

Example 3

The height of the upper thrust surface 74 lower than the height of the upper end surface 73 is 1.6mm, and the height of the lower thrust surface 51 lower than the height of the lower end surface 61 is 0.5 mm. The upper thrust surface 74 of the thrust portion 7 does not contact the lower end surface 61 of the piston 6, and friction is not generated between the upper thrust surface 74 and the lower end surface 61.

The thickness of the annular groove 72 is 1.55 mm.

Example 4

The height of the upper thrust surface 74 lower than the height of the upper end surface 73 is 2mm, and the height of the lower thrust surface 51 lower than the height of the lower end surface 61 is 0.5 mm. The upper thrust surface 74 of the thrust portion 7 does not contact the lower end surface 61 of the piston 6, and friction is not generated between the upper thrust surface 74 and the lower end surface 61.

The thickness of the annular groove 72 is 1.8 mm.

To sum up, the utility model discloses a bent axle thrust structure and compressor of embodiment has reduced thrust portion friction pair, is favorable to reducing the internal unusual wearing and tearing of pump, reduces the compressor entry, improves performance and reliability to be favorable to the annular in the oil storage, improve the shafting lubrication, reduce the wearing and tearing.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. The utility model provides a bent axle thrust structure, its characterized in that, includes bent axle (5), piston (6) and thrust portion (7), piston (6) cover is located on bent axle (5), be equipped with up end (73) on thrust portion (7), be equipped with jack (71) on up end (73), the outer circumference of jack (71) is equipped with ring channel (72), be equipped with between jack (71) and ring channel (72) and go up thrust surface (74), the height that highly is less than of going up thrust surface (74) the height of up end (73), be equipped with thrust surface (51) down on bent axle (5), be equipped with down terminal surface (61) on piston (6), rotatable the inserting of bent axle (5) in jack (71) of thrust portion (7), work as when bent axle (5) is rotatory, thrust surface (51) are followed down in thrust portion (7) go up thrust surface (74) slide, the lower end surface (61) of the piston (6) slides along the upper end surface (73) of the thrust part (7).

2. The crankshaft thrust structure of claim 1, wherein: the crankshaft (5) is in clearance fit with the groove wall of the annular groove (72) of the thrust part (7).

3. The crankshaft thrust structure of claim 1, wherein: the height difference between the upper end surface (73) of the thrust part (7) and the upper thrust surface (74) is 0.5-2 mm.

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

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

6. The crankshaft thrust structure of claim 1, wherein: the insertion hole (71) of the thrust part (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: lubricating oil is arranged in the annular groove (72).

8. 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.

9. A compressor, characterized by: a crankshaft thrust structure including a crankshaft as claimed in any one of claims 1 to 8.

10. The compressor of claim 9, wherein: the compressor is a rotor compressor.