CN219176571U - Crankshaft structure for compressor and compressor - Google Patents

Abstract

The utility model discloses a crankshaft structure for a compressor and the compressor, comprising a crankshaft body; the crankshaft body comprises a long shaft part, a main shaft part, an eccentric part and a secondary shaft part which are axially and sequentially arranged, and the tail end of the long shaft part is matched and connected with a third bearing; an axial oil hole is formed in the crankshaft body, an orifice is formed in the center of the end part of the tail end of the long shaft part, a throttling round pin is concentrically arranged in the orifice, and a throttling gap is formed between the outer side of the throttling round pin and the inner wall of the orifice; the tail end of the throttling hole is provided with a blocking nail, the first end of the blocking nail is connected with the tail end of the long shaft part, and the second end of the blocking nail is contacted with the end part of the throttling round pin; the utility model can effectively control the oil quantity of the lubricating oil flowing from the axial oil hole to the third bearing, ensure the oil quantity of the lubricating oil entering the pump body assembly and further ensure the lubricating effect of the pump body assembly; the oil quantity of lubricating oil entering the low-pressure cavity side of the compressor shell is effectively reduced, so that the volumetric efficiency of the compressor is ensured.

Description

Crankshaft structure for compressor and compressor

Technical Field

The utility model belongs to the technical field of compressors, and particularly relates to a crankshaft structure for a compressor and the compressor.

Background

At present, in the rolling piston compressor, a third bearing is arranged at the shaft end of a crankshaft to play a role in supporting the crankshaft so as to avoid the crankshaft from deforming; for example: chinese patent application "compressor and vehicle with it" (application number: CN 201710054923.9); in order to meet the lubrication effect of the third bearing, the axial oil hole in the crankshaft is generally extended to the lubrication part of the third bearing directly, but due to the high-low pressure difference effect in the compressor shell, a large amount of lubrication oil flows into the low-pressure cavity side, so that the lubrication effect of each lubrication part in the pump body assembly is uneven, and serious adverse effect is brought to the reliability of the compressor; meanwhile, the oil content of the refrigerant gas is increased due to the increase of the oil quantity at the side of the low-pressure cavity, so that the volumetric efficiency of the compressor is seriously affected.

Disclosure of Invention

Aiming at the technical problems in the prior art, the utility model provides a crankshaft structure for a compressor and the compressor, and aims to solve the technical problems that the lubrication effect of each lubrication part in a pump body assembly is uneven and the oil content of refrigerant gas is increased easily to seriously influence the reliability and the volumetric efficiency of the compressor when an axial oil hole in a crankshaft is directly extended to the lubrication part of a third bearing in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a crankshaft structure for a compressor, which is characterized by comprising a crankshaft body and a third bearing;

the crankshaft body comprises a long shaft part, a main shaft part, an eccentric part and a secondary shaft part which are axially and sequentially arranged, and the tail end of the long shaft part is matched and connected with the third bearing; an axial oil hole is formed in the crankshaft body, the initial end of the axial oil hole is communicated with the end part of the auxiliary shaft part, and the tail end of the axial oil hole extends towards the tail end face of the long shaft part along the axial direction of the crankshaft body;

an orifice is arranged in the center of the end part of the tail end of the long shaft part, a throttle round pin is concentrically arranged in the orifice, and a throttle gap is arranged between the outer side of the throttle round pin and the inner wall of the orifice; the first end of the throttling gap is communicated with the tail end of the axial oil hole, and the second end of the throttling gap is communicated with a region to be lubricated of the third bearing; the end of the throttling hole is provided with a blocking nail, the first end of the blocking nail is connected with the end of the long shaft part, and the second end of the blocking nail is in contact with the end part of the throttling round pin.

Further, the third bearing is a ball bearing; the axial of stifled nail has seted up the oilhole, go up the one end of oilhole with the second end intercommunication of throttle clearance, go up the other end of oilhole with the first end terminal surface of stifled nail is link up.

Further, the third bearing is a sliding bearing; the outer circumferential surface of the tail end of the long shaft part is provided with a surface oil groove, and the tail end of the long shaft part is radially provided with an oil passing hole; the oil passing hole is arranged between the blocking nail and the throttling round pin, one end of the oil passing hole is communicated with the bottom of the surface oil groove, and the other end of the oil passing hole is communicated with the second end of the throttling gap.

Further, the diameter d of the throttle round pin, the length L of the throttle round pin and the width delta of the throttle gap are all matched with the maximum oil demand of the third bearing.

Further, the plug pin is connected with the tail end of the long shaft part by adopting threads.

The utility model also provides a compressor, which is provided with the crankshaft structure for the compressor.

Further, the pump comprises a shell and a pump body assembly arranged in the shell; the pump body assembly comprises a crankshaft assembly, a cylinder assembly, a rolling piston, a secondary bearing cover, a main bearing and a main bearing cover; wherein, the crankshaft assembly adopts the crankshaft structure for the compressor;

a separation flange plate is sleeved on the outer side of the main bearing, and the separation flange plate separates the inner cavity of the shell into a low-pressure cavity and a high-pressure cavity; wherein a refrigerating oil pool is arranged in the high-pressure cavity; the long shaft part extends into the low-pressure cavity, and the third bearing is arranged on the end part of the low-pressure cavity; the auxiliary bearing cover is provided with an oil suction hole, one end of the oil suction hole is connected with the freezing oil pool, and the other end of the oil suction hole is communicated with the starting end of the axial oil hole.

Further, the housing includes a low pressure housing and a high pressure housing; the low-pressure shell and the high-pressure shell are respectively arranged at two sides of the separation flange plate; the low-pressure shell and the first end face of the separation flange plate are surrounded to form the low-pressure cavity, and the high-pressure shell and the second end face of the separation flange plate are surrounded to form the high-pressure cavity.

Further, a bearing support is arranged at the center of the end part of the low-pressure cavity, one end of the bearing support is fixedly connected with the inner wall of the end part of the shell, and the third bearing is installed in the bearing support.

Further, the bearing support and the shell adopt an integrated structure.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model provides a crankshaft structure for a compressor and the compressor, wherein an orifice is arranged at the end part of the tail end of a long shaft part, a throttle round pin is concentrically arranged in the orifice, and the throttle round pin is blocked and fixed by a blocking nail; the throttling clearance is used as a lubricating oil liquid to enter a third bearing oil liquid path, so that reliable lubrication of the third bearing is realized; meanwhile, the oil quantity of the lubricating oil flowing from the axial oil hole to the third bearing can be effectively controlled, so that the oil quantity of the lubricating oil entering the pump body assembly is ensured, and the lubricating effect of the pump body assembly is further ensured; in addition, the oil quantity of lubricating oil entering the low-pressure cavity side of the compressor shell is effectively reduced, and the oil content of refrigerant gas is further reduced, so that the volumetric efficiency of the compressor is ensured.

Further, the plug nails are connected with the tail ends of the long shaft parts in a threaded mode, so that the plug nails can be replaced conveniently, the throttle holes can be cleaned conveniently, and impurity blockage is avoided.

Drawings

Fig. 1 is a partial structural schematic view of a crankshaft structure for a compressor according to embodiment 1;

fig. 2 is a schematic view of the structure of a crankshaft body in embodiment 1;

fig. 3 is a partial structural schematic view of a crankshaft structure for a compressor according to embodiment 2;

fig. 4 is a sectional view of the compressor according to embodiment 3;

fig. 5 is a sectional view of the compressor according to embodiment 4.

The device comprises a shell 1, a motor assembly 2, a pump body assembly 3, a third bearing 4, a screw 5 and a freezing oil pool 6; 11 low pressure shell, 111 air inlet, 112 low pressure shell flange, 113 screw hole, 114 low pressure cavity, 115 low pressure shell inner hole; 12 high-pressure shell, 121 exhaust port, 122 high-pressure shell flange, 123 fixed through hole, 124 high-pressure cavity; 21 stator, 22 rotor; 31 crankshaft body, 311 long shaft part, 312 axial oil hole, 313 radial oil hole, 314 orifice, 315 throttle round pin, 316 blocking nail, 3160 upper oil hole, 317 surface oil groove, 318 through oil hole; a 32 cylinder assembly; 33 rolling pistons; 34 auxiliary bearings; 35 auxiliary bearing caps, 350 oil suction holes; 36 main bearings; 361 separating flange, 362 flange through holes; 37 main bearing caps; 38 an inhalation passage; 39 working chamber, 391 suction inlet; 41 bearing support.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the following specific embodiments are used for further describing the utility model in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1-2, embodiment 1 provides a crankshaft structure for a compressor, including a crankshaft body 31 and a third bearing 4; the crankshaft body 31 includes a long shaft portion 311, a main shaft portion, an eccentric portion, and a secondary shaft portion that are axially and sequentially arranged, and the end of the long shaft portion 311 is cooperatively connected with the third bearing 4; an axial oil hole 312 is provided in the crankshaft main body 31, a start end of the axial oil hole 312 penetrates an end of the auxiliary shaft portion, and a tip end of the axial oil hole 312 extends toward a tip end face of the long shaft portion 311 along an axial direction of the crankshaft main body 31.

An orifice 314 is arranged at the center of the tail end of the long shaft part 311, and a throttle round pin 315 is concentrically arranged in the orifice 314; wherein, the throttle round pin 315 is in clearance fit with the throttle hole 314, that is, a throttle gap is arranged between the outer side of the throttle round pin 315 and the inner wall of the throttle hole 314, and the throttle gap is used as a flow passage of lubricating oil; wherein, the first end of the throttling clearance is communicated with the tail end of the axial oil hole 312, and the second end of the throttling clearance is communicated with the area to be lubricated of the third bearing 4.

In this embodiment 1, the diameter d of the throttle round pin 315, the length L of the throttle round pin 315, and the width δ of the throttle gap are all matched to the maximum oil demand of the third bearing 4.

A plug 316 is arranged at the tail end of the throttle hole 314, a first end of the plug 316 is connected with the tail end of the long shaft part 311, and a second end of the plug 316 is contacted with the end part of the throttle round pin 315; wherein, the plug 316 is screwed with the end of the long shaft 311.

In this embodiment 1, the third bearing 4 is a ball bearing, and the axial direction of the plug pin 316 is provided with an upper oil hole 3160; one end of the upper oil hole 3160 is communicated with the second end of the throttling gap, and the other end of the upper oil hole 3160 is communicated with the first end face of the blocking nail 316.

Working principle:

according to the crankshaft structure for the compressor, disclosed in embodiment 1, the third bearing is arranged at the tail end of the long shaft part of the crankshaft body in a matched mode, the third bearing is fixed at the end part of the compressor shell, the long shaft part is supported by the third bearing, crankshaft deformation is avoided, and the operation reliability of the compressor is guaranteed; through setting up the orifice in the terminal tip center of long shaft portion to with throttle round pin concentric setting is in the orifice, utilizes the throttle clearance between throttle round pin and the orifice as the circulation passageway of lubricating fluid, lubricating fluid passes through behind the throttle clearance through go up the oilhole to ball bearing wait to lubricate the region, realize the lubrication effect to the third bearing.

In this embodiment 1, the throttle round pin is disposed in the throttle hole, so as to effectively control the amount of the lubricating oil entering the third bearing, so as to reduce the amount of the oil entering the low-pressure chamber side in the compressor housing on the premise of meeting the lubrication requirement of the third bearing, thereby reducing the oil content of the refrigerant gas sucked into the compressor pump body assembly, and ensuring the volumetric efficiency of the compressor.

Example 2

The principle and structure of a crankshaft structure for a compressor provided in this embodiment 2 are substantially the same as those of the crankshaft structure described in embodiment 1, except that:

as shown in fig. 3, in this embodiment 2, the third bearing 4 is a sliding bearing; a surface oil groove 317 is formed in the outer circumferential surface of the distal end of the long shaft portion 311, and an opening end of the surface oil groove 317 is disposed toward the inner ring side of the sliding bearing; an oil passing hole 318 is radially formed at the end of the long shaft portion 311, and the oil passing hole 318 is disposed between the blocking pin 316 and the throttle round pin 315; one end of the oil passing hole 318 is communicated with the bottom of the lubrication right side 317, and the other end of the oil passing hole 318 is communicated with the second end of the throttling gap.

Working principle:

in the crankshaft structure for the compressor according to embodiment 2, the third bearing is arranged at the tail end of the long shaft part of the crankshaft body in a matched manner, the third bearing is fixed at the end part of the compressor shell, and the long shaft part is supported by the third bearing, so that the deformation of the crankshaft is avoided, and the operation reliability of the compressor is ensured; through setting up the orifice in the terminal tip center of long shaft portion to with throttle round pin concentric setting is in the orifice, utilizes the throttle clearance between throttle round pin and the orifice as the circulation passageway of lubricating oil, lubricating oil passes through behind the throttle clearance through the oilhole reaches the surface oil groove, realizes the lubrication effect to the third bearing.

According to the crankshaft structure for the compressor, the throttling hole is formed in the tail end of the long shaft part, the throttling round pin is arranged in the throttling hole in a clearance fit mode, the blocking nail is arranged at the hole opening at the tail end of the throttling hole, and the blocking nail is screwed and fixed at the hole opening at the tail end of the throttling hole; when the third bearing is a ball bearing, an upper oil hole is formed in the plug along the axial direction; during operation, lubricating oil in the axial oil hole enters the third bearing through the throttling clearance between the throttling round pin and the throttling hole and then the upper oil hole on the plugging pin, so that the lubricating effect on the third bearing is realized; when the third bearing is a sliding bearing, a surface oil groove is arranged on the outer circumferential surface of the tail end of the long shaft part, and an oil passing hole is formed in the plug along the radial direction so as to communicate the surface oil groove with the throttling gap through the oil passing hole; during operation, the lubricating oil in the axial oil hole enters the surface oil groove through the throttling clearance between the throttling round pin and the throttling hole and then the oil passes through the oil passing hole on the blocking nail, so that the lubricating effect on the third bearing is realized.

In the crankshaft structure, in order to control the oil quantity of lubricating oil flowing from an axial oil hole of a crankshaft body to a third bearing, a throttle round pin is arranged in a throttle hole at the tail end of a long shaft part; a blocking nail is screwed on the orifice of the orifice, and an upper oil hole is formed in the blocking nail along the axial direction or an oil passing hole is formed in the radial direction; the lubricating oil enters the third bearing through the throttling gaps around the throttling round pin and the upper oil hole or the overflow hole, so that the third bearing is lubricated; the oil quantity of the lubricating oil entering the third bearing is related to the diameter d of the throttle round pin, the length L of the throttle round pin and the width delta of the throttle gap, and the specific size parameters of the diameter d of the throttle round pin, the length L of the throttle round pin and the width delta of the throttle gap are determined through calculation or test according to the maximum oil quantity required by the third bearing when the compressor operates.

In the utility model, the third bearing is arranged at the tail end of the long shaft part, and can be directly arranged on the inner wall of the shell or connected with the inner wall of the shell through other connecting pieces; by arranging the third bearing, the crankshaft is supported, so that the crankshaft is prevented from deforming, and the operation reliability of the compressor is ensured; the oil control mode of the throttle round pin is utilized, the structure is simple and easy to operate, and the throttle round pin is not easy to be blocked by impurities; the reliable lubrication of the third bearing is ensured; meanwhile, the oil quantity can be controlled, and the oil quantity entering the low-pressure cavity is reduced to the minimum on the premise of meeting the lubrication requirement of the third bearing, so that the oil content of refrigerant gas sucked into the working cavity in the pump body assembly is reduced, and the volumetric efficiency of the compressor is ensured; the third bearing may be a ball bearing or a sliding bearing; the oil supply device has the advantages of simple structure, smooth oil supply and controllable oil quantity, and can effectively solve the oil supply problem of the third bearing and improve the efficiency and reliability of the compressor.

Example 3

As shown in fig. 4, embodiment 3 provides a compressor, which includes a housing 1, a motor assembly 2, and a pump body assembly 3; wherein, the motor component 2 and the pump body component 3 are both arranged in the shell 1.

In this embodiment 3, the housing 1 includes a low pressure housing 11 and a high pressure housing 12, where the low pressure housing 11 is connected with the high pressure housing 12 in a sealing manner to form a cylinder structure with a closed inner cavity; an air inlet 111 is formed in the low-pressure shell 11, a low-pressure shell flange 112 is arranged outside the opening end of the low-pressure shell 11, and a plurality of threaded holes 113 are uniformly formed in the low-pressure shell flange 112 along the circumference; the high-pressure shell 12 is provided with an exhaust port 121, a high-pressure shell flange 122 is arranged outside the opening end of the high-pressure shell 12, and a plurality of fixing through holes 123 are uniformly distributed on the high-pressure shell flange 122 along the circumference.

In embodiment 3, the motor assembly 2 includes a stator 21 and a rotor 22, the stator 21 is press-fitted in the low-pressure housing inner hole 115 of the low-pressure housing 11, and the rotor 22 is disposed in the stator 21 in a fitting manner.

In this embodiment 3, the pump body assembly 3 includes a crankshaft assembly, a cylinder assembly 32, a rolling piston 33, a sub-bearing 34, a sub-bearing cap 35, a main bearing 36, and a main bearing cap 37; wherein the crankshaft assembly adopts the crankshaft structure for the compressor described in embodiment 1 or 2.

A separation flange 361 is sleeved on the outer side of the main bearing 36, and an inner ring of the separation flange 361 is fixedly connected with the outer circumferential surface of the main bearing 36; preferably, the partition flange 361 and the main bearing 36 are integrally formed; the outer ring of the partition flange 361 is connected to the housing 1 and is disposed between the open end of the low pressure housing 11 and the open end of the high pressure housing 12; a plurality of flange through holes 362 are uniformly arranged on the partition flange 361 along the circumferential direction, and the threaded holes 113, the flange through holes 362 and the fixing through holes 123 are arranged in one-to-one correspondence.

The low-pressure shell 11, the separation flange 361 and the high-pressure shell 12 are fixedly connected together through a plurality of screws 5 in sequence; wherein, the screw 5 penetrates through the fixing through hole 123 and the flange through hole 362 in sequence, and is screwed and fixed with the threaded hole 113; the separation flange 361 separates the low pressure housing 11 from the inner cavity of the high pressure housing 12, that is, the cylinder structure of the closed inner cavity is separated into a low pressure cavity 114 and a high pressure cavity 124 by the separation flange 361; the low-pressure chamber 114 is formed by the low-pressure housing 11 and the first end surface of the partition flange 361, and the high-pressure chamber 124 is formed by the high-pressure housing 12 and the second end surface of the partition flange 361.

In embodiment 3, the motor assembly 2 is disposed in the low pressure chamber 114, and the air inlet 111 communicates with the low pressure chamber 114; the working chamber 39 in the pump body assembly 3 is arranged in the high-pressure chamber 124, and the exhaust port 121 is communicated with the high-pressure chamber 124; wherein the suction inlet 391 of the working chamber 39 communicates with the low pressure chamber 114 via a suction channel 38; a refrigerating oil sump 6 is provided in the high-pressure chamber 124.

In embodiment 3, the long shaft portion 311 extends into the low pressure chamber 114, the rotor 22 is press-fitted on the long shaft portion 311, and the tip end of the long shaft portion 311 extends to the outside of the end face of the rotor 22; the main bearing 36 is sleeved on the main shaft part, the rolling piston 33 is matched with the eccentric part, and the auxiliary bearing 34 is sleeved on the auxiliary shaft part; a working chamber 39 is arranged in the cylinder assembly 32, and the rolling piston 33 is arranged in the working chamber 39; one end of the cylinder assembly 32 is connected with a first end surface of the auxiliary bearing 34, and the auxiliary bearing cover 35 is fixed on a second end surface of the auxiliary bearing 34; the other end of the cylinder assembly 32 is connected to a first end face of the main bearing 36, and the main bearing cap 37 is fixedly disposed on a second end face of the main bearing 36.

A plurality of radial oil holes 313 are formed in the crankshaft body 311 along the axial direction of the crankshaft body, one end of each radial oil hole 313 is communicated with the axial oil hole 312, and the other end of each radial oil hole 313 is communicated with a part to be lubricated of the pump body assembly 3; wherein the part to be lubricated of the pump body assembly 3 comprises a space between the crankshaft body 31 and the rolling piston 33, a space between the crankshaft body 31 and the auxiliary bearing 34 and a space between the crankshaft body 31 and the main bearing 36; the auxiliary bearing cover 35 is provided with an oil suction hole 350, one end of the oil suction hole 350 is connected to the refrigerating oil sump 6, and the other end of the oil suction hole 350 is communicated with the start end of the axial oil hole 312.

In this embodiment 3, the third bearing 4 is mounted on the end inner wall of the low pressure casing 11; wherein, a bearing support 41 is arranged in the center of the inner wall of the end part of the low-pressure shell 11, and the bearing support 41 and the low-pressure shell 11 adopt an integrated structure; the third bearing 4 is installed in the bearing support 41 in a matching manner, an oil storage cavity is formed by the end part of the third bearing 4 and the inner space of the bearing support 41, and the upper oil hole 3160 is communicated with the oil outlet cavity.

Example 4

As shown in fig. 5, this embodiment 4 provides a compressor having substantially the same structure and principle as the compressor described in the embodiment 3, except that:

the bearing support 41 and the low pressure shell 11 are in a split type design, and the bearing support 41 is fixedly connected to the inner wall of the end part of the low pressure shell 11 through welding or bolts.

According to the compressor, the separation flange plate is sleeved on the outer side of the main bearing, and the inner cavity of the shell is separated into the low-pressure cavity and the high-pressure cavity by the separation flange plate; the working cavity of the pump body assembly is arranged in the high-pressure cavity, and an air suction inlet of the working cavity of the pump body assembly is communicated with the low-pressure cavity through an air suction channel; the third bearing is arranged on the inner wall of the shell, the rotor in the motor assembly is pressed on the long shaft part, and the end part of the long shaft part, extending out of the rotor, is matched with the third bearing; when the compressor works, lubricating oil in the high-pressure cavity enters the axial oil hole through the oil suction hole on the auxiliary bearing cover, a small amount of oil enters the third bearing through a throttling gap around the throttling round pin in the throttling hole at the tail end of the long shaft part except that the lubricating oil is discharged to each lubricating part of the pump body assembly through a plurality of radial oil holes along the way, and the third bearing is lubricated; by adjusting the length, diameter and hole clearance of the throttle round pin, the oil quantity of the oil supply can be controlled, the content of refrigerating machine oil of refrigerant gas sucked into the pump body component is reduced, and the efficiency and reliability of the compressor are improved.

In the utility model, the compressor has simple structure, good assembly manufacturability of the pump body component and the motor component and easy guarantee of uniform air gap between the stator and the rotor in the motor component; the compressor of the utility model can be a vertical compressor or a horizontal compressor; the compressor can be applied to equipment provided with air conditioners for passenger cars, commercial vehicles, buses, rail transit or ships, and the compressor adopts refrigerant media comprising R744, R134a, R290, R410A or R1234yf.

The above embodiment is only one of the implementation manners capable of implementing the technical solution of the present utility model, and the scope of the claimed utility model is not limited to the embodiment, but also includes any changes, substitutions and other implementation manners easily recognized by those skilled in the art within the technical scope of the present utility model.

Claims (10)

1. A crankshaft structure for a compressor, characterized by comprising a crankshaft body (31) and a third bearing (4);

the crankshaft body (31) comprises a long shaft part (311), a main shaft part, an eccentric part and a secondary shaft part which are axially and sequentially arranged, and the tail end of the long shaft part (311) is matched and connected with the third bearing (4); an axial oil hole (312) is formed in the crankshaft body (31), the start end of the axial oil hole (312) is communicated with the end part of the auxiliary shaft part, and the tail end of the axial oil hole (312) extends towards the tail end face of the long shaft part (311) along the axial direction of the crankshaft body (31);

an orifice (314) is arranged in the center of the tail end part of the long shaft part (311), a throttle round pin (315) is concentrically arranged in the orifice (314), and a throttle gap is arranged between the outer side of the throttle round pin (315) and the inner wall of the orifice (314); wherein a first end of the throttling gap is communicated with the tail end of the axial oil hole (312), and a second end of the throttling gap is communicated with a region to be lubricated of the third bearing (4); the end of the throttle hole (314) is provided with a blocking nail (316), a first end of the blocking nail (316) is connected with the end of the long shaft part (311), and a second end of the blocking nail (316) is in contact with the end part of the throttle round pin (315).

2. A crankshaft structure for a compressor according to claim 1, characterized in that the third bearing (4) is a ball bearing; an upper oil hole (3160) is formed in the axial direction of the plug pin (316), one end of the upper oil hole (3160) is communicated with the second end of the throttling gap, and the other end of the upper oil hole (3160) is communicated with the end face of the first end of the plug pin (316).

3. A crankshaft structure for a compressor according to claim 1, characterized in that the third bearing (4) is a sliding bearing; a surface oil groove (317) is formed in the outer circumferential surface of the tail end of the long shaft part (311), and an oil passing hole (318) is formed in the tail end of the long shaft part in the radial direction; the oil passing hole (318) is arranged between the blocking nail (316) and the throttling round pin (315), one end of the oil passing hole (318) is communicated with the bottom of the surface oil groove (317), and the other end of the oil passing hole (318) is communicated with the second end of the throttling gap.

4. A crankshaft arrangement for a compressor according to claim 1, characterized in that the diameter d of the throttle round pin (315), the length L of the throttle round pin (315) and the width δ of the throttle gap are matched to the maximum oil demand of the third bearing (4).

5. A crankshaft structure for a compressor according to claim 1, wherein the plug pin (316) is screwed to the end of the long shaft portion (311).

6. A compressor having a crankshaft structure for a compressor according to any one of claims 1 to 5.

7. A compressor according to claim 6, comprising a housing (1) and a pump body assembly (3) mounted in said housing (1); the pump body assembly (3) comprises a crankshaft assembly, a cylinder assembly (32), a rolling piston (33), a secondary bearing (34), a secondary bearing cover (35), a main bearing (36) and a main bearing cover (37); wherein the crankshaft assembly employs the crankshaft structure for a compressor as claimed in any one of claims 1 to 4;

a separation flange plate (361) is sleeved on the outer side of the main bearing (36), and the separation flange plate (361) separates the inner cavity of the shell (1) into a low-pressure cavity (114) and a high-pressure cavity (124); wherein a refrigerating oil pool (6) is arranged in the high-pressure cavity (124); the long shaft part (311) extends into the low pressure cavity (114), and the third bearing (4) is mounted on the end part of the low pressure cavity (114); an oil suction hole (350) is formed in the auxiliary bearing cover (35), one end of the oil suction hole (350) is connected with the refrigerating oil pool (6), and the other end of the oil suction hole (350) is communicated with the initial end of the axial oil hole (312).

8. A compressor according to claim 7, characterized in that said housing (1) comprises a low-pressure housing (11) and a high-pressure housing (12); the low-pressure shell (11) and the high-pressure shell (12) are respectively arranged at two sides of the separation flange plate (361); the low-pressure shell (11) and the first end face of the separation flange plate (361) are surrounded to form the low-pressure cavity (114), and the high-pressure shell (12) and the second end face of the separation flange plate (361) are surrounded to form the high-pressure cavity (124).

9. A compressor according to claim 7, wherein the end center of the low pressure chamber (114) is provided with a bearing support (41), one end of the bearing support (41) is fixedly connected with the inner wall of the end of the casing (1), and the third bearing (4) is installed in the bearing support (41).

10. A compressor according to claim 9, wherein the bearing support (41) is of integral construction with the housing (1).

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