CN211144802U

CN211144802U - Medium-pressure screw compressor

Info

Publication number: CN211144802U
Application number: CN201922204857.6U
Authority: CN
Inventors: 杨葵; 杨象新
Original assignee: Elang Industry Shanghai Co ltd
Current assignee: Elang Industry Shanghai Co ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-07-31
Anticipated expiration: 2029-12-11

Abstract

The utility model discloses a medium-pressure screw compressor, which comprises a main machine and a motor; the main machine comprises a synchronous gear, an input shaft, a low-pressure section screw and a high-pressure section screw; the motor is connected with an input shaft of the host, and the synchronous gear nested on the input shaft is used for driving the low-pressure section screw and the high-pressure section screw which are parallel to each other and are not in contact with each other to rotate under the driving of the input shaft. The high-pressure section screw and the low-pressure section screw of the utility model are parallel to each other, are not contacted, have no easily damaged part, and simultaneously have smaller noise and smaller vibration during operation; two-stage compression screw rods of the main machine are driven by one motor, so that the size is compact, and the size of the equipment is reduced.

Description

Medium-pressure screw compressor

Technical Field

The utility model relates to a compressor field especially relates to a medium-pressure screw compressor.

Background

A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. When the compressor is in operation, refrigerant gas at low temperature and low pressure is sucked from the suction pipe, compressed by the motor, and then discharged to the discharge pipe.

The main engine of the existing middle-high pressure compressor is of a piston structure, and has the advantages of large noise, large vibration and large volume during operation, so that the operation reliability of equipment is reduced, and the replacement period of vulnerable parts is shortened.

Accordingly, those skilled in the art have endeavored to develop a medium pressure screw compressor that operates less noisy, vibrates less, and has no wearing parts.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects in the prior art, the technical problem to be solved in the present invention is to design a medium pressure screw compressor, which has lower operation noise, smaller vibration and no vulnerable parts.

In order to achieve the purpose, the utility model provides a medium-pressure screw compressor, the host computer and motor, the host computer includes synchronous gear, input shaft, low pressure section screw rod and high-pressure section screw rod; the motor is connected with an input shaft of the host, and the synchronous gear nested on the input shaft is used for driving the low-pressure section screw and the high-pressure section screw which are parallel to each other and are not in contact with each other to rotate under the driving of the input shaft.

Further, an interstage cooling chamber for cooling is arranged between the compression cavity of the low-pressure section screw and the compression cavity of the high-pressure section screw.

Further, the main casing wall is provided with an interface for receiving or supplementing oil for lubrication and compression.

Further, the automatic oil injection system also comprises an oil cut-off valve which is used for automatically cutting off the oil injection of the main machine when the machine is stopped.

Further, a plurality of oil filters for filtering oil of the main machine are also included.

Further, the oil-gas separator is further included and configured to separate oily substances in the compressed mixture, and the oil-gas separator is connected with an outlet of the high-pressure section screw compression cavity.

Further, the oil separator further comprises a cooler, the cooler is configured to cool the separated oil, one end of a pipeline of the cooler is connected with an oil outlet of the oil separator, and the other end of the pipeline is connected with an oil filling port of the main machine.

Further, a fan configured to air cool the cooler duct is also included.

Further, the cooling system further comprises a temperature control valve, wherein the temperature control valve is configured to start and stop the fan and control the rotating speed of the fan according to the oil return temperature of the outlet of the cooler.

Further, the air filter is used for primarily filtering the inlet air; and the air filter is connected with an inlet of a low-pressure section screw compression chamber of the main machine.

The device provided by the utility model has following technological effect:

1. the synchronous gear is adopted to connect the low-pressure section screw and the high-pressure section screw which are parallel to each other and are not in contact with each other, so that the reciprocating motion of a quick-wear part is avoided, the vibration is small, and the noise is small;

2. the low-pressure section screw rod and the high-pressure section screw rod of the main machine are driven by one motor, so that the volume of the equipment is reduced.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

FIG. 1 is a schematic diagram of a preferred embodiment of the apparatus of the present invention;

fig. 2 is a schematic diagram of the internal structure of the host shown in fig. 1.

Wherein, 1-a cooler; 2-a fan; 3, a motor; 4-a case; 5-an oil filter; 6-a host; 7-an air inlet valve; 8-fuel cut-off valve; 9-an oil-gas separator; 10-a temperature control valve; 11-safety valve; 12-an air filter; 13-minimum pressure valve;

51-an input shaft; 52-a synchronizing gear; 53-low pressure section screw; 54-high pressure section screw; 55-interstage cooling chamber; 56-air outlet.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

Some exemplary embodiments of the invention have been described for illustrative purposes, and it is to be understood that the invention may be practiced otherwise than as specifically described.

Fig. 1 is a schematic diagram of a medium-pressure screw compressor with an outlet pressure of 1.8-3.0 MPa, and fig. 2 is a schematic diagram of an internal structure of a main unit of the compressor.

The compressor has the following specific working process:

1) the gas to be compressed enters the main machine 6 through the air inlet valve 7;

2) the motor 3 is connected with an input shaft 51 of the host machine 6, and drives a low-pressure section screw 53 and a high-pressure section screw 54 which are parallel to each other to rotate through a synchronous gear 52 nested on the input shaft so as to compress gas;

3) the compressed mixture obtained by compression of the high-pressure section screw 54 of the main machine 6 is conveyed to the oil-gas separator 9, and the oil-gas separator 9 separates gas and oil in the compressed mixture; the separated gas can be stored through a gas discharge pipe of the compressor; the separated oil is cooled and then injected into the main engine 6 again for reuse, and oil circuit circulation is completed.

It should be noted that the main machine 6 may also choose "dry compression" without using oil for lubrication and cooling to cool and "contain" the compressed gas, to further increase the compression ratio of the gas. At this time, the main machine 6 simply uses the rotation compressed gas of the low-pressure section screw 53 and the high-pressure section screw 54; accordingly, step 3) above is not required and is directly available at the outlet 56 of the high pressure section screw 54 after step 2) above. The dry compression is lack of lubrication of oil, so that the noise of a rotating contact part is increased, but correspondingly, the compressor does not need to be provided with the oil-gas separator 9, and the dry compression is suitable for the situation that the gas to be compressed is easy to react with the oil or is difficult to separate from the oil.

Preferably, in order to accelerate the reduction of the temperature of the separated oil, the cooler 1 is arranged between the oil-gas separator 9 and the host machine 6, and the shell or the pipeline of the cooler 1 can be arranged to be a fin-shaped protrusion or a fence-shaped protrusion so as to increase the heat dissipation area; further, the compressor may further include a fan 2, and the fan 2 blows air to form convection to further cool the cooler 1. Further, in order to improve the automatic control performance of the oil temperature, a temperature control valve 10 is arranged to further control the starting, stopping and rotating speed of the fan 2.

In order to prevent the excessive pressure of the compression cavity of the main machine 6 caused by the continuous oil injection during the shutdown in the process of maintenance, abnormity or accidents, an oil cut-off valve 8 which automatically cuts off the oil injection to the main machine 6 is preferably arranged.

In order to improve the oil regeneration in the oil circulation and prevent the increase of the oil content from influencing the cooling, lubricating and compressing functions, the main machine 6 is preferably provided with a plurality of oil filters 5 for filtering the oil inside; preferably, the oil filter 5 is provided at an automatic oil supply inlet or an oil filling port of a pipe connecting the cooler 1 and the main machine 6.

To reduce the possibility that other impurities to be compressed may have an adverse effect on the compression process, the inlet valve 7 is preferably provided with an air filter 12.

Preferably, an interstage cooling chamber 55 is arranged between the compression chamber of the low-pressure section screw 53 and the compression chamber of the high-pressure section screw 54, so as to further improve the compression capacity of the high-pressure section screw and simultaneously facilitate the improvement of oil-gas separation of the oil-gas separator 9.

In order to further reduce the noise and vibration in the operation of the compressor, preferably, a case 4 is provided for accommodating the base comprising the main machine 6 and the motor 3, and the case 4 is made of a sound-deadening and vibration-proof material; preferably, the lower surface of the base of the case 4 is provided with a mute pad.

In order to further reduce the volume of the compressor equipment, the compressor is preferably arranged into an upper layered structure and a lower layered structure, and the host machine 6 and the motor 3 are arranged at the bottom layer; the cooler 1 and the air cooler 2 are positioned at the top layer; the oil-gas separator 9 and related pipelines are connected with other parts by adopting bent pipelines and flanges according to space.

In order to prevent the pressure in the oil-gas separator 9 from being too high, a safety valve 11 is preferably arranged, and pressure relief is automatically carried out when the pressure in the cavity of the oil-gas separator 9 exceeds a given value.

In order to adjust the oil flow velocity and pressure between the gas-oil separator 9 and the cooler 1, a minimum pressure valve 13 is preferably provided.

To optimize safety and constant pressure when compressing gas, the bearing temperature of the input shaft 51 is preferably controlled to be not higher than 95 ℃; preferably, the exhaust temperature dew point temperature of the main engine 6 is set to be 5-10 ℃.

When the device works, gas to be compressed is sucked from the air inlet valve 7, compressed to about 6-8 bar pressure through the low-pressure section screw 53, cooled interstage, enters the high-pressure section screw 54 compression chamber, finally compressed to 30-40 bar air volume, and discharged to the oil-gas separator 9 from the air outlet 56.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The medium-pressure screw compressor is characterized by comprising a main machine and a motor, wherein the main machine comprises a synchronous gear, an input shaft, a low-pressure section screw and a high-pressure section screw; the motor is connected with an input shaft of the host, and the synchronous gear nested on the input shaft is used for driving the low-pressure section screw and the high-pressure section screw which are parallel to each other and are not in contact with each other to rotate under the driving of the input shaft.

2. The medium pressure screw compressor according to claim 1, wherein an inter-stage cooling chamber for cooling is provided between the compression chamber of the low pressure stage screw and the compression chamber of the high pressure stage screw.

3. Medium pressure screw compressor according to claim 1 or 2, characterised in that the main casing wall is provided with a port for receiving or supplementing oil for lubrication and compression.

4. The medium pressure screw compressor according to claim 3, further comprising an oil cut-off valve for automatically cutting off the oil injection of the main machine at the time of a shutdown.

5. The medium pressure screw compressor according to claim 3, further comprising a plurality of oil filters for filtering oil of the main machine.

6. The medium pressure screw compressor of claim 3, further comprising an oil and gas separator configured to separate oily substances from the compressed mixture, the oil and gas separator being connected to the high pressure section screw compression chamber outlet.

7. The medium pressure screw compressor according to claim 6, further comprising a cooler configured to cool the separated oil, wherein a pipe of the cooler is connected at one end to an oil outlet of the oil separator and at the other end to an oil injection port of the main machine.

8. The medium pressure screw compressor of claim 7, further comprising a fan configured to air cool the cooler duct.

9. The medium pressure screw compressor of claim 8, further comprising a thermostatic valve configured to turn the fan on and off and control the fan speed based on the cooler outlet oil return temperature.

10. The medium pressure screw compressor according to claim 1, further comprising an air filter for primary filtering of the intake air; and the air filter is connected with an inlet of a low-pressure section screw compression chamber of the main machine.