CN114483538B - Diesel locomotive air compressor capable of preventing engine oil from emulsifying - Google Patents
Diesel locomotive air compressor capable of preventing engine oil from emulsifying Download PDFInfo
- Publication number
- CN114483538B CN114483538B CN202210014520.2A CN202210014520A CN114483538B CN 114483538 B CN114483538 B CN 114483538B CN 202210014520 A CN202210014520 A CN 202210014520A CN 114483538 B CN114483538 B CN 114483538B
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- CN
- China
- Prior art keywords
- driving assembly
- shell
- compression
- oil
- deformation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000010705 motor oil Substances 0.000 title claims abstract description 32
- 230000003137 locomotive effect Effects 0.000 title claims abstract description 18
- 230000001804 emulsifying effect Effects 0.000 title claims description 8
- 238000007906 compression Methods 0.000 claims abstract description 67
- 230000006835 compression Effects 0.000 claims abstract description 64
- 239000003921 oil Substances 0.000 claims abstract description 54
- 238000004945 emulsification Methods 0.000 claims abstract description 6
- 239000000839 emulsion Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C5/00—Locomotives or motor railcars with IC engines or gas turbines
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Compressor (AREA)
Abstract
The invention relates to an oil-emulsifying-prevention diesel locomotive air compressor, which comprises a compression cylinder and a driving assembly, wherein the compression cylinder is arranged above the driving assembly, the compression cylinder comprises a compression shell and a compression rod, the compression shell is arranged above the driving assembly, the compression rod is arranged on the inner side of the compression shell, the compression shell comprises an evaporator and a deformation shell, the deformation shell is arranged above the driving assembly, the evaporator is sleeved on the outer sides of the driving assembly and the deformation shell, the compression rod slides compressed air back and forth in the deformation shell in a working state, a large amount of heat is generated by the compression shell, the heat on the surface of the compression shell is conducted to the driving assembly through the evaporator, engine oil in the driving assembly is heated, and water drops in the engine oil are evaporated, so that the oil-water separation is completed, and the problem that the existing air compressor is easy to cause oil emulsification is solved.
Description
Technical Field
The invention relates to the technical field of air compressors, in particular to an diesel locomotive air compressor capable of preventing engine oil from emulsifying.
Background
The existing air compressor is easy to cause oil emulsification, in the process of compressing air, steam in the air enters the engine oil along with the operation of a mechanism to be condensed into water drops, and the water drops are contacted with the engine oil, so that the engine oil is emulsified, the maintenance period of the air compressor is shortened, and the maintenance cost is increased.
Disclosure of Invention
The invention aims to provide an air compressor of an internal combustion locomotive for preventing engine oil from being emulsified, which solves the problem that the engine oil of the existing air compressor is easy to be emulsified.
In order to achieve the above object, the invention provides an oil-emulsion-preventing diesel locomotive air compressor, which comprises a compression cylinder and a driving assembly, wherein the compression cylinder is arranged above the driving assembly and is fixedly connected with the driving assembly, the compression cylinder comprises a compression shell and a compression rod, the compression shell is arranged above the driving assembly and is fixedly connected with the driving assembly, the compression rod is arranged on the inner side of the compression shell and is in sliding connection with the compression shell, and the compression rod is in rotary connection with the driving assembly; the compression shell comprises an evaporator and a deformation shell, the deformation shell is arranged above the driving assembly and fixedly connected with the driving assembly, and the evaporator is sleeved on the outer sides of the driving assembly and the deformation shell and is fixedly connected with the driving assembly and the deformation shell respectively.
Under the operating condition, the compression rod slides compressed air back and forth in the deformation shell, can lead to the compression shell produces a large amount of heat, through the heat conduction of evaporimeter with compression shell surface reaches drive assembly, the heating engine oil in the drive assembly makes the water droplet evaporation in the engine oil to accomplish oil-water separation, solved current air compressor and caused the problem that engine oil emulsifies easily.
The evaporator comprises a heat conduction pipe and an oil pump, wherein the oil pump is arranged on one side of the driving assembly and is fixedly connected with the driving assembly, the heat conduction pipe is sleeved on the outer sides of the driving assembly and the deformation shell and is respectively fixedly connected with the deformation shell and the driving assembly, and the heat conduction pipe is communicated with the oil pump.
And the heat conduction pipe is filled with heat conduction oil, and the oil pump drives the heat conduction oil to circularly flow in the heat conduction pipe.
The deformation shell comprises a shell and a sliding liner, the shell is arranged above the driving assembly and fixedly connected with the driving assembly, and the sliding liner is arranged on the inner side of the shell and is in sliding connection with the shell.
The top of sliding bladder is equipped with the spring, and under the operating condition, during compression, the sliding bladder is followed the cover shell upwards slides, when gas discharge back the sliding bladder passes through the spring and slides downwards.
The compression rod comprises a piston and a connecting rod, the piston is arranged on the inner side of the sliding liner and is in sliding connection with the sliding liner, the connecting rod is arranged below the piston and is in hinged connection with the piston, and the connecting rod is in rotary connection with the driving assembly.
The driving assembly drives the piston to slide up and down on the inner side of the sliding liner through the connecting rod, and compresses and discharges gas on the inner side of the sliding liner.
The driving assembly comprises an oil storage tank and a rotating shaft, wherein the oil storage tank is arranged below the deformation shell and fixedly connected with the deformation shell, the rotating shaft is arranged on the inner side of the oil storage tank and is rotationally connected with the oil storage tank, and the rotating shaft is rotationally connected with the compression rod.
The motor drives the rotating shaft to rotate at the inner side of the oil storage tank, and the rotating shaft drives the piston to slide at the inner side of the sliding liner through the connecting rod, so that gas is compressed.
The rotary shaft is provided with a rotary shaft and a connecting column, the connecting column is arranged on the inner side of the oil storage tank, the connecting column is rotationally connected with the compression rod, the rotary shaft is symmetrically arranged at the bottoms of the two sides of the connecting column, and the rotary shaft penetrates through the side wall of the oil storage tank and is rotationally connected with the oil storage tank.
The motor drives the connecting column to rotate by taking the axial lead of the rotating shaft as the shaft through the rotating shaft, the connecting column drives the piston to slide up and down through the connecting rod, and meanwhile, the rotating shaft close to the oil pump can be connected with the oil pump, so that the oil pump is driven to rotate.
According to the diesel locomotive air compressor capable of preventing engine oil from being emulsified, in a working state, the compression rod slides back and forth in the deformation shell to compress air, so that a large amount of heat is generated by the compression shell, the heat on the surface of the compression shell is conducted to the driving assembly through the evaporator, engine oil in the driving assembly is heated, water drops in the engine oil are evaporated, oil-water separation is completed, and the problem that the existing air compressor is easy to cause engine oil emulsification is solved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an axial measurement structure of an air compressor of an diesel locomotive for preventing engine oil from emulsifying.
Fig. 2 is a schematic diagram of a top view structure of an air compressor of an diesel locomotive for preventing oil from emulsifying.
Fig. 3 is a schematic side view of an air compressor of an diesel locomotive, which is protected from oil emulsion.
Fig. 4 is a schematic diagram of a cross-sectional front view of an air compressor of an diesel locomotive for preventing oil emulsion.
Fig. 5 is an enlarged schematic diagram of a front view cross-section of an air compressor of an diesel locomotive, which is provided by the invention and prevents engine oil from emulsifying.
1-compression cylinder, 2-drive assembly, 3-compression shell, 4-compression rod, 5-oil storage tank, 6-axis of rotation, 7-evaporimeter, 8-deformation shell, 9-connecting rod, 10-piston, 11-pivot, 12-spliced pole, 13-heat pipe, 14-oil pump, 15-cover shell, 16-slip courage, 17-closure strip, 18-air inlet, 19-through-hole, 20-exhaust groove, 21-aeration tank, 22-venthole, 23-exhaust passage, 24-heat expansion piece.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1 to 5, the diesel locomotive air compressor capable of preventing oil from emulsifying provided by the invention comprises a compression cylinder 1 and a driving assembly 2, wherein the compression cylinder 1 is arranged above the driving assembly 2 and is fixedly connected with the driving assembly 2, the compression cylinder 1 comprises a compression shell 3 and a compression rod 4, the compression shell 3 is arranged above the driving assembly 2 and is fixedly connected with the driving assembly 2, the compression rod 4 is arranged on the inner side of the compression shell 3 and is in sliding connection with the compression shell 3, and the compression rod 4 is in rotary connection with the driving assembly 2. The compression shell 3 comprises an evaporator 7 and a deformation shell 8, wherein the deformation shell 8 is arranged above the driving assembly 2 and fixedly connected with the driving assembly 2, and the evaporator 7 is sleeved on the outer sides of the driving assembly 2 and the deformation shell 8 and is fixedly connected with the driving assembly 2 and the deformation shell 8 respectively.
In this embodiment, the engine oil is stored in the inner side of the driving assembly 2, the compression cylinder 1 slides back and forth in the deformation shell 8 to compress air in the working state, which causes the compression shell 3 to generate a large amount of heat, the heat on the surface of the compression shell 3 is conducted to the driving assembly 2 through the evaporator 7, the engine oil in the driving assembly 2 is heated, so that water drops in the engine oil are evaporated, and thus the oil-water separation is completed, and the problem that the existing air compressor is easy to cause the emulsification of the engine oil is solved.
The evaporator 7 comprises a heat-conducting pipe 13 and an oil pump 14, the oil pump 14 is arranged on one side of the driving assembly 2 and is fixedly connected with the driving assembly 2, the heat-conducting pipe 13 is sleeved on the outer sides of the driving assembly 2 and the deformation shell 8 and is respectively fixedly connected with the deformation shell 8 and the driving assembly 2, and the heat-conducting pipe 13 is communicated with the oil pump 14;
the deformation shell 8 comprises a shell 15 and a sliding liner 16, the shell 15 is arranged above the driving assembly 2 and fixedly connected with the driving assembly 2, and the sliding liner 16 is arranged on the inner side of the shell 15 and is in sliding connection with the shell 15;
the casing 15 is provided with a closing strip 17 and an air inlet 18, the air inlet 18 is arranged on the inner side of the side wall of the casing 15, the air inlet 18 is matched with the sliding liner 16, and the closing strip 17 is arranged on one side of the casing 15 far away from the air inlet 18 and penetrates through the side wall of the casing 15;
the sealing strip 17 is provided with an air outlet hole 22, an air exhaust passage 23 and a thermal expansion block 24, the air outlet hole 22 is arranged on the side surface of the sealing strip 17 and penetrates through the sealing strip 17, the air exhaust passage 23 is arranged on the inner side of the sealing strip 17, the air exhaust passage 23 is arranged below the air outlet hole 22, the air exhaust passage 23 is communicated with the air outlet hole 22, the air outlet hole 22 and the air exhaust passage 23 are matched with the sliding liner 16, and the thermal expansion block 24 is arranged at the bottom of the sealing strip 17;
the sliding liner 16 has a through hole 19, an air exhaust groove 20 and an air inflation groove 21, the through hole 19 is symmetrically arranged at two sides of the sliding liner 16 and penetrates through the side wall of the sliding liner 16, the air inflation groove 21 is arranged at one side of the sliding liner 16 close to the air inlet 18 and is matched with the air inlet 18, the air inflation groove 21 is arranged below the air inlet 18, the air exhaust groove 20 is arranged at one side of the sliding liner 16 far away from the air inflation groove 21, the air exhaust groove 20 is arranged at the inner side of the sliding liner 16, and the air exhaust groove 20 is matched with the air exhaust passage 23;
the compression rod 4 comprises a piston 10 and a connecting rod 9, the piston 10 is arranged on the inner side of the sliding liner 16 and is in sliding connection with the sliding liner 16, the connecting rod 9 is arranged below the piston 10 and is in hinged connection with the piston 10, and the connecting rod 9 is in rotary connection with the driving assembly 2.
In this embodiment, the engine oil is stored inside the driving assembly 2, the air inlet 18 and the sealing strip 17 are both externally connected with a unidirectional air valve, a spring is arranged at the top of the sliding liner 16, the heat conducting oil is filled in the heat conducting pipe 13, in an operating state, the driving assembly 2 drives the piston 10 to slide up and down inside the sliding liner 16 through the connecting rod 9 to compress the air inside the deformation shell 8, when the air is compressed, the air pressure above the piston 10 is increased, the working temperature of the air is increased by the piston 10, a small amount of high-pressure air enters the driving assembly 2 through a gap between the piston 10 and the sliding liner 16, the high-temperature air contacts with the low-temperature engine oil inside the driving assembly 2, so that the water vapor in the air is cooled and condensed into water drops, if the water drops cannot be separated from the engine oil in time, under the condition of long-time stirring, the engine oil and water drops are combined for emulsification, so that when the preheating is started, the one-way air valve is opened, the air outlet hole 22 and the air inlet 18 are communicated with the adjacent through holes 19, air enters the sliding liner 16 from the air inlet 18 through the through holes 19, when the piston 10 slides upwards, the air is directly discharged from the air outlet through the through holes 19, at the moment, the piston 10 does not work on the air, the air pressure above the piston 10 is kept stable, the one-way air valve is closed after the preheating is finished, the heat generated by friction between the sliding liner 16 and the piston 10 is transferred to the surface of the shell 15, the thermal expansion block 24 is heated for expansion, the sealing strip 17 is jacked up, the air outlet hole 22 and the through holes 19 are dislocated, and meanwhile, the oil pump 14 drives the heat conducting oil to circulate in the heat conducting pipe 13, the heat on the surface of the shell 15 is conducted to the driving assembly 2 through heat conduction oil to heat engine oil, water drops in the engine oil are evaporated into water vapor, then when the piston 10 slides downwards, the air inlet 18 is communicated with the adjacent through hole 19, the air inflation groove 21 is staggered with the air inlet 18, the air exhaust groove 20 is communicated with the air exhaust passage 23, air pressure above the piston 10 is reduced, air is sucked in, meanwhile, air below the piston 10 is increased, air in the driving assembly 2 is discharged from the air outlet hole 22 along with water vapor along the air exhaust groove 20, the air pressure above the piston 10 is increased to drive the piston 10 to slide upwards when the piston 10 slides upwards, the air outlet hole 22 is communicated with the through hole 19, the air inflation groove 21 is communicated with the air inlet 18, air inside the sliding liner 16 is discharged from the air outlet hole 22, meanwhile, the air below the piston 10 is reduced, and the air enters the driving assembly 2 from the air outlet hole 22 along with the air inlet hole 18.
The driving assembly 2 comprises an oil storage tank 5 and a rotating shaft 6, the oil storage tank 5 is arranged below the deformation shell 8 and fixedly connected with the deformation shell 8, the rotating shaft 6 is arranged on the inner side of the oil storage tank 5 and is rotatably connected with the oil storage tank 5, and the rotating shaft 6 is rotatably connected with the compression rod 4.
The rotating shaft 6 is provided with a rotating shaft 11 and a connecting column 12, the connecting column 12 is arranged on the inner side of the oil storage tank 5, the connecting column 12 is rotationally connected with the compression rod 4, the rotating shaft 11 is symmetrically arranged at the bottoms of two sides of the connecting column 12, and the rotating shaft 11 penetrates through the side wall of the oil storage tank 5 and is rotationally connected with the oil storage tank 5.
In this embodiment, the rotating shaft 6 is externally connected with a motor, the motor drives the connecting column 12 to rotate by taking the axial lead of the rotating shaft 11 as the axis through the rotating shaft 11 at one side of the connecting column 12, and the connecting column 12 drives the piston 10 to slide up and down through the connecting rod 9, so that air inside the sliding liner 16 is compressed, and meanwhile, the rotating shaft 11 close to the oil pump 14 can be connected with the oil pump 14, so that the motor drives the rotating shaft 6 to rotate and simultaneously drives the oil pump 14 to rotate.
Claims (4)
1. An air compressor of an internal combustion locomotive for preventing engine oil from emulsifying is characterized in that,
the diesel locomotive air compressor capable of preventing engine oil from being emulsified comprises a compression cylinder and a driving assembly, wherein the compression cylinder is arranged above the driving assembly and is fixedly connected with the driving assembly, the compression cylinder comprises a compression shell and a compression rod, the compression shell is arranged above the driving assembly and is fixedly connected with the driving assembly, the compression rod is arranged on the inner side of the compression shell and is in sliding connection with the compression shell, and the compression rod is in rotary connection with the driving assembly;
the compression shell comprises an evaporator and a deformation shell, the deformation shell is arranged above the driving assembly and fixedly connected with the driving assembly, and the evaporator is sleeved on the outer sides of the driving assembly and the deformation shell and is fixedly connected with the driving assembly and the deformation shell respectively;
the deformation shell comprises a shell and a sliding liner, the shell is arranged above the driving assembly and fixedly connected with the driving assembly, and the sliding liner is arranged on the inner side of the shell and is in sliding connection with the shell;
the compression rod comprises a piston and a connecting rod, the piston is arranged on the inner side of the sliding liner and is in sliding connection with the sliding liner, the connecting rod is arranged below the piston and is in hinged connection with the piston, and the connecting rod is in rotary connection with the driving assembly.
2. An oil emulsion resistant diesel locomotive air compressor as set forth in claim 1 wherein,
the evaporator comprises a heat conduction pipe and an oil pump, wherein the oil pump is arranged on one side of the driving assembly and is fixedly connected with the driving assembly, the heat conduction pipe is sleeved on the outer sides of the driving assembly and the deformation shell and is respectively fixedly connected with the deformation shell and the driving assembly, and the heat conduction pipe is communicated with the oil pump.
3. An oil emulsion resistant diesel locomotive air compressor as set forth in claim 1 wherein,
the driving assembly comprises an oil storage tank and a rotating shaft, wherein the oil storage tank is arranged below the deformation shell and fixedly connected with the deformation shell, the rotating shaft is arranged on the inner side of the oil storage tank and is rotationally connected with the oil storage tank, and the rotating shaft is rotationally connected with the compression rod.
4. An air compressor for an internal combustion locomotive for preventing emulsification of engine oil according to claim 3,
the rotation shaft is provided with a rotation shaft and a connecting column, the connecting column is arranged on the inner side of the oil storage tank, the connecting column is in rotary connection with the compression rod, the rotation shaft is symmetrically arranged at the bottoms of two sides of the connecting column, and the rotation shaft penetrates through the side wall of the oil storage tank and is in rotary connection with the oil storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210014520.2A CN114483538B (en) | 2022-01-07 | 2022-01-07 | Diesel locomotive air compressor capable of preventing engine oil from emulsifying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210014520.2A CN114483538B (en) | 2022-01-07 | 2022-01-07 | Diesel locomotive air compressor capable of preventing engine oil from emulsifying |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114483538A CN114483538A (en) | 2022-05-13 |
| CN114483538B true CN114483538B (en) | 2024-01-26 |
Family
ID=81510613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210014520.2A Active CN114483538B (en) | 2022-01-07 | 2022-01-07 | Diesel locomotive air compressor capable of preventing engine oil from emulsifying |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114483538B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103635760A (en) * | 2011-02-22 | 2014-03-12 | 惠而浦股份有限公司 | Compressor cooling system using heat exchanger pre-condenser, and compressor provided with cooling system |
| CN206770174U (en) * | 2017-06-08 | 2017-12-19 | 深圳市中科创想科技有限责任公司 | A kind of high efficiency and heat radiation air compressor machine |
| CN108571435A (en) * | 2018-06-06 | 2018-09-25 | 东莞市速美机电设备有限公司 | A kind of single cylinder High-Pressure Compressor |
| CN208619343U (en) * | 2018-07-13 | 2019-03-19 | 武义广利机电有限公司 | One kind having oily air compressor |
| CN111677643A (en) * | 2020-06-10 | 2020-09-18 | 德耐尔能源装备有限公司 | Air-cooled shale gas retrieves and uses compressor |
| CN111878350A (en) * | 2020-08-07 | 2020-11-03 | 浙江洛森压缩机股份有限公司 | Safe and efficient automobile-used gas compressor |
| CN212842358U (en) * | 2020-08-07 | 2021-03-30 | 广州新创机电设备有限公司 | Air conditioning equipment with heat pump unit |
| CN213870276U (en) * | 2020-09-02 | 2021-08-03 | 长沙迈拓节能自动化科技有限公司 | Screw machine with two-stage compression |
-
2022
- 2022-01-07 CN CN202210014520.2A patent/CN114483538B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103635760A (en) * | 2011-02-22 | 2014-03-12 | 惠而浦股份有限公司 | Compressor cooling system using heat exchanger pre-condenser, and compressor provided with cooling system |
| CN206770174U (en) * | 2017-06-08 | 2017-12-19 | 深圳市中科创想科技有限责任公司 | A kind of high efficiency and heat radiation air compressor machine |
| CN108571435A (en) * | 2018-06-06 | 2018-09-25 | 东莞市速美机电设备有限公司 | A kind of single cylinder High-Pressure Compressor |
| CN208619343U (en) * | 2018-07-13 | 2019-03-19 | 武义广利机电有限公司 | One kind having oily air compressor |
| CN111677643A (en) * | 2020-06-10 | 2020-09-18 | 德耐尔能源装备有限公司 | Air-cooled shale gas retrieves and uses compressor |
| CN111878350A (en) * | 2020-08-07 | 2020-11-03 | 浙江洛森压缩机股份有限公司 | Safe and efficient automobile-used gas compressor |
| CN212842358U (en) * | 2020-08-07 | 2021-03-30 | 广州新创机电设备有限公司 | Air conditioning equipment with heat pump unit |
| CN213870276U (en) * | 2020-09-02 | 2021-08-03 | 长沙迈拓节能自动化科技有限公司 | Screw machine with two-stage compression |
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| Publication number | Publication date |
|---|---|
| CN114483538A (en) | 2022-05-13 |
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