CN201916196U - Vertical two-stage scroll compressor with differential pressure oil supply - Google Patents

Abstract

The utility model discloses a vertical two-stage scroll compressor for supplying oil by differential pressure and aims at providing a compressor, which meets the requirement of a low-temperature refrigeration system, reduces the power consumption, ensures the operation performance, saves energy source and protects the environment. The vertical two-stage scroll compressor comprises an enclosure, a motor stator, a motor rotor, a low pressure stage compression assembly and a high pressure stage compression assembly, wherein the low pressure stage compression assembly and the high pressure stage compression assembly are arranged along the direction of the same vertical axial line and are respectively positioned at two ends of the enclosure; the motor rotor and the motor stator are positioned between the low pressure stage compression assembly and the high pressure stage compression assembly; and a low pressure stage oil supply pipe and a high pressure stage oil supply pipe are respectively connected with a low pressure stage machine seat and a high pressure stage machine seat and extend into a lubricating oil sump at the bottom of the enclosure. The work process of the compressor is divided into two compression phases, so that the pressure ratio of each stage is smaller than the standard value, and further the power consumption of the compressor is reduced and the requirement of the low-temperature refrigeration system is met. The oil supply by differential pressure can be realized by using the pressure for low pressure exhaust in the enclosure, so that the operation performance is ensured.

Description

Vertical two-stage scroll compressor with differential pressure oil supply

technical field

The utility model relates to a vertical two-stage scroll compressor suitable for pressure difference oil supply in a low-temperature refrigeration system.

Background technique

Scroll refrigeration compressors are widely used in refrigeration systems due to their good operating performance. The current scroll refrigeration compressors are mostly single-stage compression. In the refrigeration system, when the evaporation temperature decreases or the condensation temperature increases, the ratio of the discharge pressure to the suction pressure of the compressor increases, and the power consumption increases. Efficiency decreases, exhaust temperature increases, performance of lubricating oil decreases, compressor operating performance decreases. Therefore, the scope of use of the scroll refrigeration compressor is limited.

When the ratio of the condensing pressure to the evaporating pressure of the refrigeration system exceeds the specified value, in order to ensure the safe, reliable and economical operation of the compressor, two-stage compression should be used. When the floor space of the refrigeration unit is limited, vertical scroll refrigeration compressors should be used. In order to meet the needs of low-temperature refrigeration systems and expand the scope of use of scroll refrigeration compressors, a vertical two-stage scroll refrigeration compressor that is energy-saving, environmentally friendly, and simple in structure should be developed. However, no researcher has proposed a technical solution for specific implementation at present.

Utility model content

The utility model aims to overcome the deficiencies in the prior art, and provides a vertical two-stage scroll compressor suitable for pressure differential oil supply in a low-temperature refrigeration system, so as to meet the requirements of the low-temperature refrigeration system and ensure the compressor Improve operating performance, reduce operating costs, save energy, and protect the environment.

The utility model is realized through the following technical solutions:

A vertical two-stage scroll compressor with differential pressure oil supply, characterized in that it includes a casing, a motor stator, a motor rotor, a low-pressure stage compression assembly and a high-pressure stage compression assembly arranged along the same vertical axis; the low-pressure stage compression The assembly and the high-pressure stage compression assembly are respectively located at both ends of the casing, and the motor rotor and motor stator are located between the low-pressure stage compression assembly and the high-pressure stage compression assembly;

The low-pressure stage compression assembly includes a low-pressure stage main shaft, a low-pressure stage frame, a low-pressure stage orbiting scroll, a low-pressure stage fixed scroll, a low-pressure stage Oldham coupling ring, a low-pressure stage oil supply pipe, a low-pressure stage suction pipe, a low-pressure stage Exhaust pipe; the low-pressure stage main shaft is a crank shaft structure and is arranged in a vertical direction. One end of the low-pressure stage main shaft passes through the low-pressure stage frame to cooperate with the motor rotor. The eccentric crank pin on the low-pressure stage main shaft is connected to the The shaft connecting groove on the outer side of the chassis of the low-pressure stage orbiting scroll cooperates, and the boss on the low-pressure stage cross coupling ring cooperates with the grooves distributed in a cross on the low-pressure stage frame and the low-pressure stage orbiting scroll to connect the low-pressure stage frame And the low-pressure stage rotating scroll, the low-pressure stage rotating scroll is driven by the low-pressure stage main shaft to rotate and translate around the center of the low-pressure stage fixed scroll; the two radial lugs of the low-pressure stage frame are closely matched with the casing , the low-pressure stage frame is connected with the low-pressure stage fixed scroll through gaskets and screws; the low-pressure stage frame is provided with a low-pressure stage oil hole communicating with the surface of the low-pressure stage main shaft, and the low-pressure stage oil hole is immersed in The low-pressure stage oil supply pipe in the lubricating oil pool is connected; the low-pressure stage exhaust hole is provided at the center of the upper chassis of the low-pressure stage fixed scroll, and the low-pressure stage is installed on the casing corresponding to the low-pressure stage exhaust hole. Exhaust pipe; the low-pressure stage fixed scroll and the low-pressure stage orbiting scroll are meshed with a phase difference of 180 degrees, and the top of the scroll tooth of the low-pressure stage fixed scroll contacts the inner side of the chassis of the low-pressure stage orbiting scroll. The inner surface of the chassis of the first-stage fixed scroll is in contact with the top surface of the spiral of the low-pressure stage orbiting scroll, and forms the outermost low-pressure stage suction space on the axis, and the innermost layer communicates with the low-pressure stage exhaust hole There are three pairs of working chambers in the low-pressure stage exhaust space and the middle low-pressure stage compression space. The low-pressure stage base is provided with a low-pressure stage suction port that communicates with the outermost low-pressure stage suction space. The low-pressure stage The suction port is connected with the low-pressure suction pipe;

The high-pressure stage compression assembly includes a high-pressure stage main shaft, a high-pressure stage frame, a high-pressure stage rotating scroll, a high-pressure stage fixed scroll, a high-pressure stage cross coupling ring, a high-pressure stage oil supply pipe, a high-pressure stage suction pipe, a high-pressure stage Exhaust pipe; the high-pressure stage main shaft has a crankshaft structure and is arranged in the vertical direction. One end of the high-pressure stage main shaft passes through the high-pressure stage machine base and cooperates with the motor rotor through a sleeve. Some eccentric crank pins cooperate with the shaft connection grooves on the outer side of the high-pressure stage orbiting scroll chassis, and the bosses on the high-pressure stage cross coupling ring are respectively located on the high-pressure stage frame and the high-pressure stage orbiting scroll. Cooperate to connect the high-pressure stage frame and the high-pressure stage rotating scroll, the high-pressure stage rotating scroll is driven by the high-pressure stage main shaft to rotate and translate around the center of the high-pressure stage fixed scroll; the two radial protrusions of the high-pressure stage frame The lugs are closely matched with the casing, and the high-pressure-grade base is connected with the high-pressure-grade fixed scroll through gaskets and screws; the high-pressure-grade base is provided with a high-pressure-grade oil hole that communicates with the surface of the high-pressure-grade main shaft; The high-pressure grade oil hole is connected with the high-pressure grade oil supply pipe immersed in the lubricating oil pool; the high-pressure grade fixed scroll is provided with a high-pressure grade exhaust hole in the middle of the upper chassis, and the high-pressure grade exhaust hole is welded to the high-pressure grade exhaust pipe ;The high-pressure stage fixed scroll and the high-pressure stage orbiting scroll mesh with a phase difference of 180 degrees. The inner surface of the chassis of the scroll disk is in contact with the top surface of the spiral teeth of the high-pressure stage orbiting scroll, and forms the outermost high-pressure stage suction space on the axis, and the innermost layer communicates with the high-pressure stage exhaust hole. The high-pressure stage exhaust space and the high-pressure stage compression space in the middle are three pairs of working chambers. The high-pressure stage fixed scroll is provided with a high-pressure stage suction port that communicates with the outermost high-pressure stage suction space. The high-pressure stage The suction port is connected with the high-pressure suction pipe;

The motor rotor cooperates with the motor stator, and the motor stator cooperates with the casing.

The high-pressure stage suction pipe, high-pressure stage exhaust pipe and low-pressure stage suction pipe are located on the same side of the casing.

The eccentric crank pin on the high-pressure stage main shaft and the eccentric crank pin on the low-pressure stage main shaft are arranged at 180 degrees.

The casing is formed by connecting an upper casing and a lower casing.

The utility model has the following technical effects:

1. The vertical two-stage scroll compressor with differential pressure oil supply of the utility model utilizes the low-pressure stage compression assembly and the high-pressure stage compression assembly in the same casing to adjust the corresponding condensation temperature and evaporation temperature required by the working conditions of the refrigeration system. The ratio of discharge pressure to suction pressure is divided into two compression stages, so that the pressure ratio of each stage is smaller than the specification value, so as to reduce the power consumption of the compressor, and a large pressure ratio can be achieved to meet the needs of low-temperature refrigeration systems. Save energy and protect the environment.

2. The vertical two-stage scroll compressor with pressure difference oil supply of the utility model utilizes the pressure of the low-pressure stage exhaust in the casing to realize pressure difference oil supply and ensure the operating performance of the compressor.

3. The main shaft of the vertical two-stage scroll compressor with differential pressure oil supply of the utility model has no oil hole and oil passage processing, and has simple structure, high strength, good reliability, can reduce diameter, save material and reduce weight.

4. The vertical two-stage scroll compressor with differential pressure oil supply of the present utility model has simple parts structure, convenient processing and assembly, flexible control, safety and reliability.

Description of drawings

Fig. 1 is the schematic diagram of the vertical two-stage scroll compressor of the utility model differential pressure oil supply;

Fig. 2 is A-A sectional view;

Fig. 3 is a B-B sectional view.

Detailed ways

The utility model is described in detail below in conjunction with accompanying drawing and specific embodiment.

The vertical two-stage scroll compressor with differential pressure oil supply of the present invention is shown in Fig. 1 to Fig. 3 . It includes a casing 4, a motor stator 12, a motor rotor 13, a low-pressure stage compression assembly and a high-pressure stage compression assembly arranged along the same axial direction. The low-pressure stage compression assembly and the high-pressure stage compression assembly are respectively located at two ends of the casing, and the motor rotor and motor stator are located between the low-pressure stage compression assembly and the high-pressure stage compression assembly.

The low-pressure stage compression assembly includes a low-pressure stage main shaft 11, a low-pressure stage frame 3, a low-pressure stage orbiting scroll 8, a low-pressure stage fixed scroll 5, a low-pressure stage Oldham coupling ring 2, a low-pressure stage oil supply pipe 10, a low-pressure stage Suction pipe 25, low-pressure stage exhaust pipe 26. The low-pressure stage main shaft 11 is a crank shaft structure and is arranged in the vertical direction. One end of the low-pressure stage main shaft 11 passes through the low-pressure stage frame 3 to cooperate with the motor rotor 13. The eccentric crank pin on the low-pressure stage main shaft 11 Cooperate with the shaft connection groove on the outer side of the chassis of the low-pressure stage orbiting scroll 8, and the boss on the low-pressure stage Oldham coupling ring 2 cooperates with the grooves distributed in a cross on the low-pressure stage frame and the low-pressure stage orbiting scroll to connect the low-pressure stage. The stage base 3 and the low-pressure stage orbiting scroll 8, the low-pressure stage orbiting scroll 8 is driven by the low-pressure stage main shaft 11 to rotate and translate around the center of the low-pressure stage fixed scroll 5 . The two radial lugs of the low-pressure stage frame 3 are closely matched with the casing 4 , and the low-pressure stage frame 3 is connected with the low-pressure stage fixed scroll 5 through a gasket and screws 7 . The low-pressure stage base 3 is provided with a low-pressure stage oil hole 1 communicating with the surface of the low-pressure stage main shaft. The low-pressure stage oil hole 1 is connected with a low-pressure stage oil supply pipe 10 immersed in a lubricating oil pool. A low-pressure stage exhaust hole 6 is provided at the center of the upper chassis of the low-pressure stage fixed scroll 5 , and a low-pressure stage exhaust pipe 26 is installed on the housing 0 corresponding to the low-pressure stage exhaust hole 6 . The low-pressure stage fixed scroll 5 and the low-pressure stage orbiting scroll 8 mesh with a phase difference of 180 degrees. The inner surface of the chassis of the scroll disk is in contact with the top surface of the spiral teeth of the low-pressure stage orbiting scroll, and forms the outermost low-pressure stage suction space on the axis, and the innermost layer communicates with the low-pressure stage exhaust hole. There are three pairs of working chambers in total, the low-pressure stage exhaust space and the middle low-pressure stage compression space. The low-pressure stage base 3 is provided with a low-pressure stage suction port 9 communicating with the outermost low-pressure stage suction space. The suction port 9 is connected with the low-pressure stage suction pipe 25 . When the compressor is working, the rotating scroll 8 of the low-pressure stage is driven by the rotation of the low-pressure stage main shaft 11, so that the volume of each working chamber of the low-pressure stage is continuously reduced from the outside to the inside, so as to realize the purpose of suction, compression and exhaust of the low-pressure stage .

The high-pressure stage compression assembly includes a high-pressure stage main shaft 16, a high-pressure stage frame 14, a high-pressure stage rotating scroll 17, a high-pressure stage fixed scroll 20, a high-pressure stage Oldham coupling ring 15, a high-pressure stage oil supply pipe 23, a high-pressure stage Suction pipe 21, high-pressure exhaust pipe 18. The high-pressure stage main shaft 16 is a crankshaft structure and is arranged in the vertical direction. One end of the high-pressure stage main shaft 16 passes through the high-pressure stage machine base 14 and cooperates with the motor rotor 13 through the sleeve 24. The high-pressure stage main shaft 16 is equipped with Some eccentric crank pins cooperate with the shaft connection grooves on the outer side of the chassis of the high-pressure stage orbiting scroll 17, and the bosses on the high-pressure stage Oldham coupling ring 15 are distributed in a cross pattern on the high-pressure stage frame and the high-pressure stage orbiting scroll respectively. The groove cooperates to connect the high-pressure stage frame 14 and the high-pressure stage orbiting scroll 17 , and the high-pressure stage orbiting scroll 17 is driven by the high-pressure stage main shaft 16 to rotate and translate around the center of the high-pressure stage fixed scroll 20 . The two radial lugs of the high-pressure stage frame 14 are closely matched with the casing 4 , and the high-pressure stage frame 14 is connected with the high-pressure stage fixed scroll 20 through a gasket and screws 19 . The high-pressure stage base 14 is provided with a high-pressure stage oil hole 22 communicating with the surface of the high-pressure stage main shaft. The high-pressure grade oil hole 22 is connected with a high-pressure grade oil supply pipe 23 immersed in a lubricating oil pool. A high-pressure exhaust hole is provided at the center of the upper chassis of the high-pressure fixed scroll 20 , and the high-pressure exhaust hole is welded to the high-pressure exhaust pipe 18 . The high-pressure stage fixed scroll 20 meshes with the high-pressure stage orbiting scroll 17 with a phase difference of 180 degrees. The inner surface of the chassis of the scroll disk is in contact with the top surface of the spiral teeth of the high-pressure stage orbiting scroll, and forms the outermost high-pressure stage suction space on the axis, and the innermost layer communicates with the high-pressure stage exhaust hole. The high-pressure stage exhaust space and the middle high-pressure stage compression space are three pairs of working chambers. The high-pressure stage fixed scroll 20 is provided with a high-pressure stage suction port that communicates with the outermost high-pressure stage suction space. The stage suction port is connected with the high-pressure stage suction pipe 21. When the compressor is working, the rotation of the high-pressure stage main shaft 16 drives the high-pressure stage orbiting scroll 17 to rotate, so that the volume of each working chamber of the high-pressure stage becomes smaller from the outside to the inside, so as to achieve the purpose of suction, compression and exhaust of the high-pressure stage . The sleeve 24 makes the high-voltage main shaft 16 and the low-voltage main shaft 11 have the same outer diameter, can share a motor rotor 13, and rotate with the motor rotor 13 at the same time, so as to improve the motor efficiency and save space.

When the low-pressure stage compression assembly is located on the upper part of the compressor, the low-pressure stage oil supply pipe 10 passes through the motor stator and is immersed in the lubricating oil pool. The axial vertical part of the low-pressure stage oil supply pipe 10 is preferably located in the outer axial groove of the motor stator 12 Inside. When the high-pressure stage compression assembly is located on the upper part of the compressor, the high-pressure stage oil pipe 23 passes through the motor stator and is immersed in the lubricating oil pool. The axial vertical part of the high-pressure stage oil pipe 23 is preferably located in the outer axial groove of the motor stator 12 .

The motor rotor 13 cooperates with the motor stator 12 , and the motor stator 12 cooperates with the casing 4 .

In order to reduce the space used by the horizontal station, the high-pressure stage suction pipe, high-pressure stage exhaust pipe and low-pressure stage suction pipe are located on the same side of the casing.

The eccentric crank pins on the high-pressure stage main shaft and the eccentric crank pins on the low-pressure stage main shaft are arranged at 180 degrees, which can offset the unbalanced rotary inertial force and save balance weights. Small weight.

The casing 4 is formed by connecting an upper casing and a lower casing.

During assembly, the eccentric crank pin of the high-pressure stage main shaft 16 cooperates with the high-pressure stage orbiting scroll 17, and the other side of the high-pressure stage main shaft 16 is inserted into the position where the high-pressure stage frame 14 has a high-pressure stage oil hole 22, and the high-pressure stage orbiting scroll is adjusted. The outer groove of the chassis of the turntable 17 forms a cross shape with the inner groove of the high-pressure stage frame 14, and cooperates with the bosses of the cross coupling ring 15 respectively. After sealing the gasket, cooperate with the high-pressure stage fixed scroll 20 through the screw 19, weld the high-pressure stage suction pipe 21 and the high-pressure stage suction port of the high-pressure stage fixed scroll 20, and the high-pressure stage exhaust pipe 18 and the high-pressure stage The high-pressure stage exhaust hole on the fixed scroll 20 is welded, the high-pressure stage oil supply pipe 23 is welded with the high-pressure stage oil hole 22 of the high-pressure stage frame 14, and the extended end of the high-pressure stage main shaft 16 cooperates with the sleeve 24. Insert the part of the high-voltage stage main shaft 16 and the sleeve 24 into the motor rotor 13 as a whole, press the above-mentioned whole into the casing 4, and make the two radial lugs of the high-voltage stage frame 14 closely fit with the casing 4, and the high-pressure The stage exhaust pipe 18 and the high-pressure stage suction pipe 21 pass through corresponding openings on the casing 4 .

The eccentric crank pin of the low-pressure stage main shaft 11 cooperates with the low-pressure stage orbiting scroll 8, and the other side of the low-pressure stage main shaft 11 is inserted into the position where the low-pressure stage base 3 has a low-pressure stage oil hole 1, and the low-pressure stage orbiting scroll 8 is adjusted. The cross groove on the outside of the chassis forms a cross shape with the inner groove of the low-pressure stage frame 3, and cooperates with the bosses of the cross coupling ring 2 respectively, and a sealing gasket is placed on the surface where the low-pressure stage frame 3 and the low-pressure stage fixed scroll 5 cooperate. Finally, cooperate with the low-pressure stage fixed scroll 5 through the screw 7, weld the low-pressure stage suction pipe 25 to the low-pressure stage suction port 9 on the chassis of the low-pressure stage frame 3, and connect the low-pressure stage oil supply pipe 10 to the low-pressure stage machine The low-pressure stage oil hole 1 of seat 3 is welded. After matching the motor rotor 13 with the motor stator 12, insert the extended end of the above-mentioned integral low-pressure stage main shaft 11 into the motor rotor 13, make the motor rotor 13 cooperate with the low-pressure stage main shaft 11, and make the low-pressure stage suction pipe 25 pass through the casing 4 The corresponding orifice on the top, the radial two lugs of the low-pressure stage frame 3 are closely matched with the casing 4, and the axial vertical part of the low-pressure stage oil supply pipe 10 is located in the outer axial groove of the motor stator 12.

Align the upper casing with the lower casing, weld the upper casing and the lower casing, connect the high-pressure exhaust pipe 18, the high-pressure suction pipe 21, the low-pressure suction pipe 25 and the low-pressure exhaust pipe 26 to the The casing 4 is welded.

Inject the calculated amount of lubricating oil from the oil injection hole on the casing 4, position the motor junction box, take over the welding process outside the casing 4, and complete the assembly of the compressor. The low-pressure stage main shaft 11 and the high-pressure stage main shaft 16 rotate at high speed simultaneously under the drive of the motor rotor 13, and the high-pressure stage oil supply pipe 23 on the high-pressure stage frame 14 and the low-pressure stage oil supply pipe 10 on the low-pressure stage frame 3 extend into the machine. In the lubricating oil pool at the bottom of the shell 4, during the working process of the compressor, the compressed gas discharged from the low-pressure stage exhaust hole 6 fills the space in the casing 4, and under the action of the high pressure of the gas, the lubricating oil pool The lubricating oil enters the low-pressure oil hole 1 and the high-pressure oil hole 22 through the low-pressure oil supply pipe 10 and the high-pressure oil supply pipe 23, and lubricates the low-pressure stage spindle 11 and the low-pressure stage frame 3, as well as the high-pressure stage spindle 16 and the high-pressure stage. The opposite running surfaces of the machine base 14 reduce friction loss.

The low-temperature and low-pressure gas refrigerant from the evaporator enters the outermost low-pressure stage suction space between the low-pressure stage fixed scroll 5 and the low-pressure stage orbiting scroll 8 through the low-pressure stage suction pipe 25. The gas refrigeration medium at an intermediate temperature enters the space in the casing 4, cools the motor located between the low-pressure stage compression assembly and the high-pressure stage compression assembly, and then discharges the compressor through the low-pressure stage exhaust pipe 26 and enters the middle of the refrigeration system. After the cooler cools down, it enters the outermost high-pressure stage suction space between the high-pressure stage fixed scroll 20 and the high-pressure stage orbiting scroll 17 from the high-pressure stage suction pipe 21, and the compressed high-temperature and high-pressure gas refrigeration works The quality is discharged from the compressor through the high-pressure stage discharge pipe 18.

The vertical two-stage scroll compressor with differential pressure oil supply of the utility model utilizes the low-pressure stage compression assembly and the high-pressure stage compression assembly in the same vertical axis direction in the same casing of the compressor to divide the working process of the compressor into two stages. One compression stage, make the pressure ratio of each stage less than the specification value, in order to reduce the power consumption of the compressor, achieve a large pressure ratio, meet the needs of the low-temperature refrigeration system, and use the pressure of the exhaust gas of the low-pressure stage in the casing to realize the pressure difference Oil supply ensures the operating performance of the compressor, saves energy and protects the environment. The main shaft is arranged vertically, occupying a small space.

Although the disclosed vertical two-stage scroll compressor related to differential pressure oil supply has been specifically described with reference to the embodiments, the embodiments described above are illustrative rather than restrictive, without departing from the present utility model All changes and modifications within the spirit and scope of the invention are within the scope of the present invention.

Claims (4)

1. A vertical two-stage scroll compressor with differential pressure oil supply, characterized in that it includes a casing, a motor stator, a motor rotor, a low-pressure stage compression assembly and a high-pressure stage compression assembly arranged along the same vertical axis direction; The stage compression assembly and the high-pressure stage compression assembly are respectively located at both ends of the casing, and the motor rotor and motor stator are located between the low-pressure stage compression assembly and the high-pressure stage compression assembly; The low-pressure stage compression assembly includes a low-pressure stage main shaft, a low-pressure stage frame, a low-pressure stage orbiting scroll, a low-pressure stage fixed scroll, a low-pressure stage Oldham coupling ring, a low-pressure stage oil supply pipe, a low-pressure stage suction pipe, a low-pressure stage Exhaust pipe; the low-pressure stage main shaft is a crank shaft structure and is arranged in a vertical direction. One end of the low-pressure stage main shaft passes through the low-pressure stage frame to cooperate with the motor rotor. The eccentric crank pin on the low-pressure stage main shaft is connected to the The shaft connecting groove on the outer side of the chassis of the low-pressure stage orbiting scroll cooperates, and the boss on the low-pressure stage cross coupling ring cooperates with the grooves distributed in a cross on the low-pressure stage frame and the low-pressure stage orbiting scroll to connect the low-pressure stage frame And the low-pressure stage rotating scroll, the low-pressure stage rotating scroll is driven by the low-pressure stage main shaft to rotate and translate around the center of the low-pressure stage fixed scroll; the two radial lugs of the low-pressure stage frame are closely matched with the casing , the low-pressure stage frame is connected with the low-pressure stage fixed scroll through gaskets and screws; the low-pressure stage frame is provided with a low-pressure stage oil hole communicating with the surface of the low-pressure stage main shaft, and the low-pressure stage oil hole is immersed in The low-pressure stage oil supply pipe in the lubricating oil pool is connected; the low-pressure stage exhaust hole is provided at the center of the upper chassis of the low-pressure stage fixed scroll, and the low-pressure stage is installed on the casing corresponding to the low-pressure stage exhaust hole. Exhaust pipe; the low-pressure stage fixed scroll and the low-pressure stage orbiting scroll are meshed with a phase difference of 180 degrees, and the top of the scroll tooth of the low-pressure stage fixed scroll contacts the inner side of the chassis of the low-pressure stage orbiting scroll. The inner surface of the chassis of the first-stage fixed scroll is in contact with the top surface of the spiral of the low-pressure stage orbiting scroll, and forms the outermost low-pressure stage suction space on the axis, and the innermost layer communicates with the low-pressure stage exhaust hole There are three pairs of working chambers in the low-pressure stage exhaust space and the middle low-pressure stage compression space. The low-pressure stage base is provided with a low-pressure stage suction port that communicates with the outermost low-pressure stage suction space. The low-pressure stage The suction port is connected with the low-pressure suction pipe; The high-pressure stage compression assembly includes a high-pressure stage main shaft, a high-pressure stage frame, a high-pressure stage rotating scroll, a high-pressure stage fixed scroll, a high-pressure stage cross coupling ring, a high-pressure stage oil supply pipe, a high-pressure stage suction pipe, a high-pressure stage Exhaust pipe; the high-pressure stage main shaft has a crankshaft structure and is arranged in the vertical direction. One end of the high-pressure stage main shaft passes through the high-pressure stage machine base and cooperates with the motor rotor through a sleeve. Some eccentric crank pins cooperate with the shaft connection grooves on the outer side of the high-pressure stage orbiting scroll chassis, and the bosses on the high-pressure stage cross coupling ring are respectively located on the high-pressure stage frame and the high-pressure stage orbiting scroll. Cooperate to connect the high-pressure stage frame and the high-pressure stage rotating scroll, the high-pressure stage rotating scroll is driven by the high-pressure stage main shaft to rotate and translate around the center of the high-pressure stage fixed scroll; the two radial protrusions of the high-pressure stage frame The lugs are closely matched with the casing, and the high-pressure-grade base is connected with the high-pressure-grade fixed scroll through gaskets and screws; the high-pressure-grade base is provided with a high-pressure-grade oil hole that communicates with the surface of the high-pressure-grade main shaft; The high-pressure grade oil hole is connected with the high-pressure grade oil supply pipe immersed in the lubricating oil pool; the high-pressure grade fixed scroll is provided with a high-pressure grade exhaust hole in the middle of the upper chassis, and the high-pressure grade exhaust hole is welded to the high-pressure grade exhaust pipe ;The high-pressure stage fixed scroll and the high-pressure stage orbiting scroll mesh with a phase difference of 180 degrees. The inner surface of the chassis of the scroll disk is in contact with the top surface of the spiral teeth of the high-pressure stage orbiting scroll, and forms the outermost high-pressure stage suction space on the axis, and the innermost layer communicates with the high-pressure stage exhaust hole. The high-pressure stage exhaust space and the high-pressure stage compression space in the middle are three pairs of working chambers. The high-pressure stage fixed scroll is provided with a high-pressure stage suction port that communicates with the outermost high-pressure stage suction space. The high-pressure stage The suction port is connected with the high-pressure suction pipe; The motor rotor cooperates with the motor stator, and the motor stator cooperates with the casing. 2. The vertical two-stage scroll compressor with differential pressure oil supply according to claim 1, characterized in that the high-pressure stage suction pipe, high-pressure stage exhaust pipe and low-pressure stage suction pipe are located on the same side of the casing. 3. The vertical two-stage scroll compressor with pressure differential oil supply according to claim 1, characterized in that the eccentric crank pin on the high-pressure stage main shaft and the eccentric crank pin on the low-pressure stage main shaft are arranged at 180 degrees . 4. The vertical two-stage scroll compressor with differential pressure oil supply according to claim 1, wherein the casing is formed by connecting an upper casing and a lower casing.

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