CN218669722U - Connecting rod of refrigeration compressor - Google Patents

Abstract

The utility model relates to a refrigeration compressor connecting rod belongs to compressor technical field. The structure includes body (2) and solid fixed cylinder (22), and body (2) one end is equipped with crank throw connecting hole (21), and solid fixed cylinder (22) are established in crank throw connecting hole (21), are equipped with cooling tank (221) on solid fixed cylinder (22) lateral wall, and cooling tank (221) bottom surface is equipped with oil outlet gas vent (222), is equipped with circulation oilhole (23) with cooling tank (221) intercommunication on crank throw connecting hole (21) inner wall. The structure discharges refrigeration steam in time through the oil outlet and exhaust port (222), the cooling groove (221) and the circulating oil hole (23), cavitation damage is avoided, lubrication and cooling of the crank connecting end (11) and the crank connecting hole (21) are achieved, and abrasion is reduced. The problems that the joint of the connecting end of the existing crank (11) and the crank connecting hole (21) is large in abrasion and poor in lubricating effect are solved.

Description

Connecting rod of refrigeration compressor

Technical Field

The utility model relates to a refrigeration compressor connecting rod belongs to compressor technical field.

Background

The refrigeration compressor is a heart of a refrigeration system, and functions to suck low-temperature and low-pressure refrigerant gas, drive a crankshaft-connecting rod motion mechanism through the operation of a motor, further drive a piston-cylinder unit to compress the refrigerant, discharge high-temperature and high-pressure refrigerant gas, and provide power for a refrigeration cycle, thereby realizing the refrigeration cycle of compression → condensation → expansion → evaporation (heat absorption). In the working process of the refrigeration system, the compressor sucks low-temperature and low-pressure refrigerant steam from the evaporator, and the low-temperature and low-pressure refrigerant steam is changed into high-temperature and high-pressure refrigerant gas after doing work and is discharged into the condenser; wherein, a part of low-temperature and low-pressure refrigerant vapor is dissolved in the refrigeration oil, and when the compressor runs, the refrigerant vapor dissolved in the refrigeration oil can pass through an oil pumping system of the crankshaft along with the refrigeration oil to reach each lubricating point; because the solubility of the refrigerant and the refrigerant oil is very high, the viscosity of the refrigerant oil is greatly reduced, particularly the viscosity of the connecting rod and the crank kinematic pair, the refrigerant oil can continuously volatilize during the motion friction, the gas is not easy to discharge, and the cavitation erosion is easy to form, in addition, the working condition of the compressor is severe, the bearing load is large, the crank is high in temperature during the operation, the cavitation erosion, the high load and the high temperature are caused, the lubricating effect is reduced, the abrasion is accelerated, and the service life of the compressor is influenced. The high-solubility refrigeration oil flows out of the lubricating oil hole of the crankshaft and lubricates the surface of the crank throw and the side wall of the crank throw connecting hole; because the cooperation clearance of bell crank surface and bell crank connecting hole is very little, when bell crank surface and bell crank connecting hole kinematic pair were rotatory at a high speed, the volatile refrigeration steam of refrigeration oil, it is difficult in time to discharge, produce "cavitation" easily, and generate heat when rotatory at a high speed, the temperature is high, under the viscosity of lubricating oil, simultaneously because bell crank surface and bell crank connecting hole cooperation clearance are very little, the lubricating oil mass is few, cause compressor bearing load big, and the connecting rod body generally adopts powder metallurgy material, it is low to be able to bear or endure to wear, more easily produce the wearing and tearing phenomenon, so the diameter of general kinematic pair all can select major diameter phi 16mm or phi 19mm, but the bigger linear speed of diameter is big, efficiency reduces.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that current crank throw link and crank throw connecting hole junction wearing and tearing are big, lubricated effect is poor.

The utility model provides a technical scheme that its technical problem adopted is: the connecting rod of the refrigeration compressor comprises a body, wherein one end of the body is provided with a crank connecting hole, the connecting rod further comprises a fixing barrel, the fixing barrel is arranged in the crank connecting hole and in interference fit with the crank connecting hole, a cooling groove is formed in the outer side wall of the fixing barrel, an oil outlet and an oil outlet are formed in the bottom surface of the cooling groove, a circulating oil hole is formed in the inner wall of the crank connecting hole, and the open end of the circulating oil hole is communicated with the cooling groove.

Wherein, the oil outlet and exhaust port is 2-4 and arranged at intervals.

Wherein, the circulation oilhole runs through the body along body length direction in above-mentioned structure.

Furthermore, in the structure, the circulating oil hole and the oil outlet and exhaust port are arranged in a staggered mode.

Wherein, in the structure, the cooling groove is of an annular structure and is arranged along the circumferential direction of the outer wall of the fixed cylinder.

Wherein, the fixed cylinder in the structure is made of carbon steel after nitriding treatment.

The utility model has the advantages that: through the innovative design of the connecting rod and the oil way, refrigerant steam dissolved in the refrigeration oil is timely discharged, the refrigerant steam cannot exist between the surface of the crank and the crank connecting hole for a long time, the defect of 'cavitation' is avoided, meanwhile, the innovative design of the connecting rod is that the oil way is cooled, the problem of temperature rise is solved, the lubricating oil is supplemented on the connecting rod, the problem of the lubricating oil quantity is solved, different materials can be adopted at the crank connecting hole, the problem of abrasion resistance of the materials is solved, the problem of abrasion is solved, the diameter of a kinematic pair is reduced to phi 14mm, the efficiency is improved by 1%, and the noise is reduced by more than 1.5dB due to better improvement of friction.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an explosion diagram of the structure of the present invention.

Fig. 3 is an exploded view of the utility model after installation.

Fig. 4 is an exploded view of a prior art structural joint.

Labeled as: 1 is a crankshaft, 11 is a crank throw, 111 is a lubricating oil hole, 2 is a body, 21 is a crank throw connecting hole, 22 is a fixed cylinder, 221 is a cooling groove, 222 is an oil outlet and exhaust port, and 23 is a circulating oil hole.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1 to 4, the utility model discloses a refrigerant compressor connecting rod, including body 2, 2 one end of body is provided with crank connecting hole 21, still includes solid fixed cylinder 22, gu fixed cylinder 22 sets up in crank connecting hole 21, and with crank connecting hole 21 interference fit, gu be provided with cooling bath 221 on the fixed cylinder 22 lateral wall, and the cooling bath 221 bottom surface is provided with out oil gas vent 222, is provided with circulation oilhole 23 on the crank connecting hole 21 inner wall, and circulation oilhole 23 open end and cooling bath 221 intercommunication. As can be understood by those skilled in the art, the structure enables the high-solubility refrigeration oil to flow out from the lubricating oil hole 111 on the side wall of the crank throw 11 at the upper end of the crankshaft 1 and enter the surface of the crank throw 11 and the inner wall of the crank throw connecting hole 21, and when the kinematic pair rotates at high speed, the refrigeration steam volatilized by the refrigeration oil is discharged into the circulating oil hole 23 on the inner wall of the crank throw connecting hole 21 through the oil outlet and exhaust port 222 and the cooling groove 221 and is discharged in time, so that the defect of 'cavitation' is avoided; meanwhile, the refrigeration oil flows out from the lubricating oil hole 111 of the crank 11, enters the surface of the crank 11 and the surface of the crank connecting hole 21, flows into the cooling groove 221 through the oil outlet and exhaust port 222, and finally flows into the circulating oil hole 23 to flow out, so that oil circulation is formed; after the low-temperature refrigeration oil flows into the cooling groove 221, the surface of the crank throw 11 and the surface of the crank throw connecting hole 21 are circularly cooled, rotated at a high speed and subjected to high temperature caused by high load, so that the deformation caused by the heat load and the reduction of the oil viscosity are greatly reduced; meanwhile, the refrigeration oil in the cooling groove 221 can be reversely supplemented to the surface of the crank throw 11 and the surface of the oil circulation hole 23 at different rotation angles, so as to play a role in supplementing lubrication. Not only the problem of abrasion is solved, but also the diameter of the kinematic pair is reduced to phi 14mm, namely the fixed cylinder 22 is arranged to reduce the size of the connecting end of the crank throw 11 to phi 14mm. Meanwhile, the efficiency is improved by 1%, and the noise is reduced by more than 1.5dB due to better improvement of friction. In order to ensure the circulation flow of the refrigeration oil, the fixed cylinder 22 and the crank connecting hole 21 are connected and fixed by interference fit, and the fixed cylinder 22 is sleeved on the crank 11 in actual use, so that the lubricating oil hole 111 and the oil outlet and exhaust port 222 are communicated, and the opening end of the circulation oil hole 23 is communicated with the cooling groove 221. The circulation oil hole 23 is mainly used for exhausting air, so that it should be penetrated and arranged in a through hole structure, so that the inside of the crank connecting hole 21 is communicated with the outside of the body 2 through the circulation oil hole 23.

Preferably, in the above structure, the number of the oil outlet/exhaust ports 222 is 2 to 4, and the ports are arranged at intervals. It can be understood by those skilled in the art that in order to achieve normal operation of air discharge and lubrication, the present structure preferably has a plurality of oil discharge holes, and in consideration of the size of the fixed cylinder 22, the number of oil discharge holes 222 is preferably 2 to 4, and the oil discharge holes are spaced apart from each other. In practice, 2 oil outlet/exhaust ports 222 may be preferred.

Preferably, the oil circulation hole 23 penetrates the body 2 along the longitudinal direction of the body 2 in the above-mentioned structure. As will be understood by those skilled in the art, in order to fully utilize the refrigerant oil carried by the refrigerant vapor while exhausting air, the present structure preferably has the oil circulation hole 23 penetrating the body 2 along the length direction of the body 2, so that the oil circulation hole 23 directly extends along the pipeline of the body 2 to the other connection end of the body 2, and the connection is further lubricated while exhausting the refrigerant vapor.

Preferably, in the above structure, the circulation oil hole 23 and the oil outlet/exhaust port 222 are provided in a staggered manner. As will be understood by those skilled in the art, in order to ensure that a sufficient amount of refrigerant oil is always maintained in the cooling groove 221 to lubricate the joint between the crank throw 11 and the crank throw connecting hole 21, the configuration preferably has the oil circulation hole 23 and the oil outlet/air outlet port 222 arranged in a staggered manner, so that the refrigerant oil coming out of the lubricating oil hole 111 flows into the cooling groove 221 through the oil outlet/air outlet port 222 and is then discharged through the oil circulation hole 23.

Preferably, in the above structure, the cooling groove 221 is an annular structure and is circumferentially disposed along the outer wall of the fixed cylinder 22. As can be understood by those skilled in the art, in order to realize circumferential lubrication at the joint of the crank throw 11 and the crank throw connecting hole 21, the cooling groove 221 is preferably of an annular structure and is circumferentially arranged along the outer wall of the fixed cylinder 22.

Preferably, in the above structure, the fixed cylinder 22 is made of carbon steel after nitriding treatment. It will be appreciated by those skilled in the art that the wear at the junction of the bell crank 11 and the bell crank attachment bore 21 is reduced. The service life of the device is prolonged. The material for preferentially manufacturing the crank throw connecting hole 21 in the structure can be a material which is more wear-resistant than powder metallurgy, and is preferentially made of carbon steel after nitriding treatment, and meanwhile, the wear resistance of the body 2 can be improved by increasing the wear resistance of the bearing bush.

Claims (6)

1. Refrigeration compressor connecting rod, including body (2), body (2) one end is provided with crank connecting hole (21), its characterized in that: still include fixed section of thick bamboo (22), fixed section of thick bamboo (22) set up in crank connecting hole (21), and with crank connecting hole (21) interference fit, be provided with cooling tank (221) on fixed section of thick bamboo (22) lateral wall, and cooling tank (221) bottom surface is provided with oil outlet gas vent (222), is provided with circulation oilhole (23) on crank connecting hole (21) inner wall, and circulation oilhole (23) open end and cooling tank (221) intercommunication.

2. The refrigerant compressor connecting rod as set forth in claim 1, wherein: the number of the oil outlet and exhaust ports (222) is 2-4, and the oil outlet and exhaust ports are arranged at intervals.

3. The refrigerant compressor connecting rod as set forth in claim 1, wherein: the circulating oil hole (23) penetrates through the body (2) along the length direction of the body (2).

4. The refrigerant compressor connecting rod according to claim 1, wherein: the circulating oil hole (23) and the oil outlet and exhaust port (222) are arranged in a staggered mode.

5. The refrigerant compressor connecting rod as set forth in claim 1, wherein: the cooling groove (221) is of an annular structure and is arranged along the circumferential direction of the outer wall of the fixed cylinder (22).

6. The refrigerant compressor connecting rod as set forth in claim 1, wherein: the fixed cylinder (22) is made of carbon steel after nitriding treatment.

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