CN109595138B - Natural gas compressor and compression method - Google Patents
Natural gas compressor and compression method Download PDFInfo
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- CN109595138B CN109595138B CN201811418879.6A CN201811418879A CN109595138B CN 109595138 B CN109595138 B CN 109595138B CN 201811418879 A CN201811418879 A CN 201811418879A CN 109595138 B CN109595138 B CN 109595138B
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Classifications
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- 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
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/18—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use for specific elastic fluids
-
- 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
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
-
- 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
-
- 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
-
- 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
- F04B39/06—Cooling; Heating; Prevention of freezing
-
- 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
Abstract
The invention discloses a natural gas compressor and a compression method, wherein the first valve and the second valve are matched with each other, so that the compressed gas of the compression device is used as instrument wind to drive a pneumatic ball valve of the compression device, the cost of a user is saved, and meanwhile, the main pipeline and the bypass pipeline can be switched according to the actual state of the compression device, so that the compression device is switched between low load and heavy load, and the service life of the compression device and the stability of the compression device are improved. The pre-stop mode is set before stopping, so that the oil content in the oil-gas separator in the compression device is reduced, the oil content of exhaust gas is reduced, the consumption of oil is reduced, and the service life of the oil-gas separator is prolonged. After the machine is stopped, the first valve is closed, the third valve is opened, gas is recovered into the gas inlet buffer tank, the purpose of resource recovery is achieved, the gas and the compression device are cut off, potential safety hazards caused by oil seal leakage are avoided, and the safety of the whole equipment is guaranteed.
Description
Technical Field
The invention relates to the field of mechanical design, in particular to a natural gas compressor and a compression method.
Background
Natural gas is colorless, odorless and nontoxic gas, has the advantages of high heat value, stable combustion, cleanness, environmental protection, low price and the like, and is often used as a substitute fuel for urban buses, taxis, short-distance transportation and distributed energy sources.
The natural gas of 2barg is usually required to be directly connected with the compression device to compress the natural gas, when the compression device is just started, the compression device does not enter a normal compression working condition, if the natural gas is directly compressed when the compressor is started, the starting load of the compression device can be greatly increased, and the service life of the compression device is greatly reduced.
Disclosure of Invention
Aiming at the defects existing in the prior art, the main purpose of the invention is to overcome the defects of the prior art, and discloses a natural gas compressor which comprises a buffer tank, an air inlet device, a compression device and a cooling device, wherein the buffer tank comprises an air inlet buffer tank and an air outlet buffer tank, and the air inlet buffer tank, the air inlet device, the compression device, the cooling device and the air outlet buffer tank are sequentially connected;
the air inlet device comprises a pneumatic ball valve, a first valve, a second valve, a main pipeline, a bypass pipeline and an air taking pipeline, wherein both ends of the main pipeline and both ends of the bypass pipeline are connected with the air inlet buffer tank and the compression device, the pneumatic ball valve is connected in the main pipeline in series, the first valve is connected in the bypass pipeline in series, the second valve is connected with an air outlet end of the compression device through the air taking pipeline, and gas compressed by the compression device is used as instrument wind to control the connection and disconnection of the pneumatic ball valve through the second valve;
the air outlet end of the compression device is connected with the cooling device through a first check valve.
Further, the air intake buffer tank further comprises a third valve and a second check valve, and the air intake pipeline is connected with the air intake buffer tank through the third valve and the second check valve.
Further, a minimum pressure valve is arranged between the air outlet end of the compression device and the first check valve.
Further, the gas taking point of the gas taking pipeline is arranged between the gas outlet end of the compression device and the minimum pressure valve.
Further, the air outlet buffer tank is externally connected with a safety valve.
Further, the device also comprises a pressure regulating valve, wherein the air outlet buffer tank is connected with the air inlet buffer tank through the pressure regulating valve.
Further, a filter device is arranged at the air outlet of the air outlet buffer tank.
A method of natural gas compression comprising the steps of:
s1, an air source is connected into an air inlet buffer tank, a first valve and a second valve are opened, at the moment, a main pipeline is not opened, a side pipeline is opened, and a compression device is started under low load;
s2, through the operation of the compression device, the gas in the pipeline is compressed, the air pressure is increased, the air pressure of an air taking point of the air taking pipeline is increased, the gas is conveyed into the pneumatic ball valve through the air taking pipeline and the second valve, the main pipeline is opened, and the cooling device is started;
s3, entering a normal compression stage, conveying compressed gas into an air outlet buffer tank, and then discharging the compressed gas into an air collection tank;
s4, after other compression is finished, the air source is cut off and then the machine is stopped.
Further, a pre-shutdown is performed before the shutdown in step S4, where the pre-shutdown includes closing the second valve, opening the first valve, and reducing the output power of the compression device to below 10%, and operating for at least 30 seconds.
Further, in step S4, after the device is shut down, the first valve is closed, and the third valve is opened.
The invention has the beneficial effects that:
according to the invention, through the mutual matching of the first valve and the second valve, the compressed gas of the compression device is used as instrument wind to drive the pneumatic ball valve of the compression device, so that the cost of a user is saved, and meanwhile, the main pipeline and the bypass pipeline can be switched according to the actual state of the compression device, so that the compression device can be switched between low load and heavy load, and the service life of the compression device and the stability of the compression device are improved. The pre-stop mode is set before stopping, so that the oil content in the oil-gas separator in the compression device is reduced, the oil content of exhaust gas is reduced, the consumption of oil is reduced, and the service life of the oil-gas separator is prolonged. After the machine is stopped, the first valve is closed, the third valve is opened, gas is recovered into the gas inlet buffer tank, the purpose of resource recovery is achieved, the gas and the compression device are cut off, potential safety hazards caused by oil seal leakage are avoided, and the safety of the whole equipment is guaranteed.
Drawings
FIG. 1 is a schematic view of a natural gas compressor of the present invention;
the reference numerals are as follows:
2. the air inlet device 3, the compression device 4, the cooling device 5, the first check valve 11, the air inlet buffer tank 12, the air outlet buffer tank 21, the pneumatic ball valve 22, the first valve 23, the second valve 24, the main pipeline 25, the bypass pipeline 26, the air taking pipeline 31, the compressor 32, the oil tank 33, the oil-gas separator 34, the temperature control valve 35, the third check valve 36, the filter 61, the third valve 62, the second check valve 64, the minimum pressure valve 65, the safety valve 66, the pressure regulating valve 67 and the filtering device.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention relates to a natural gas compressor, which is shown in figure 1, and comprises a buffer tank, an air inlet device 2, a compression device 3 and a cooling device 4, wherein the buffer tank comprises an air inlet buffer tank 11 and an air outlet buffer tank 12, and the air inlet buffer tank 11, the air inlet device 2, the compression device 3, the cooling device 4 and the air outlet buffer tank 12 are connected in sequence; the natural gas firstly enters the air inlet buffer tank 11, then the natural gas in the air inlet buffer tank 11 is conveyed into the compression device 3 through the air inlet device 2, the compressed natural gas is cooled by the cooling device 4, then the natural gas is flushed into the air outlet buffer tank 12, and finally the natural gas is discharged into the air collecting tank. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the air inlet device 2 comprises a pneumatic ball valve 21, a first valve 22, a second valve 23, a main pipeline 24, a bypass pipeline 25 and an air taking pipeline 26, wherein both ends of the main pipeline 24 and the bypass pipeline 25 are connected with the air inlet buffer tank 11 and the compression device 3, namely the air inlet buffer tank 11 is connected with the compression device 3 through the main pipeline 24, and the bypass pipeline 25 is connected on the main pipeline 24 in parallel; the pneumatic ball valve 21 is connected in series in the main pipeline 24, the first valve 22 is connected in series in the side pipeline 25, the second valve 23 is connected with the air outlet end of the compression device 3 through the air taking pipeline 26, and the second valve 23 is used for controlling the connection and disconnection of the instrument wind of the pneumatic ball valve 21 so as to control the opening and closing of the pneumatic ball valve 21; the outlet end of the compression device 3 is connected to the cooling device 4 via a first non-return valve 5. Solenoid valves may be used for the first valve 22 and the second valve 23.
The first valve 22 and the second valve 23 are opened, when the natural gas in the air inlet buffer tank 11 enters the air inlet device 2, the gas flows into the compression device 3 from the bypass pipeline 25, at the moment, the gas quantity is small, the load of the compression device 3 is reduced, the compression device 3 compresses the gas, the pressure of the air outlet end of the compression device gradually rises, the pressure of the air taking point also synchronously rises, the gas is transmitted to the pneumatic ball valve 21 from the air taking point through the air taking pipeline 26, after the gas reaches a certain pressure, the pneumatic ball valve 21 is opened, the gas in the air inlet buffer tank 11 is transmitted through the main pipeline 24, and at the moment, the bypass pipeline 25 can be closed or opened. Through setting up main pipeline and by-pass line, guaranteed the low-load start-up when equipment starts, reduced the damage to compression device, improve its life. The compressed gas of the compressor is used as the instrument wind to control the opening and closing of the pneumatic ball valve, the instrument wind from the outside is not needed, the use cost of equipment is reduced, in addition, the first valve 22 and the second valve 23 are matched, and the pneumatic ball valve 21 is opened by taking the gas as the instrument wind only when the normal working pressure is achieved in the compressor and the pipeline thereof, namely, the gas pressure reaches the working pressure, so that the gas is fully input. It can be seen that the control of the opening and closing of the main line 24 by the pneumatic ball valve 21 is based on the actual state of the compression device 3, not by time control, and the main line 24 is opened only after the compressor reaches the normal operation state. Thus, the service life of the compression device is further prolonged, the compression efficiency is improved, and the energy consumption is reduced.
The compression device 3 comprises a compressor 31, an oil tank 32, an oil-gas separator 33, a temperature control valve 34 and a third check valve 35, wherein the compressor 31, the oil tank 32 and the oil-gas separator 33 are sequentially connected, an oil outlet end of the oil tank 32 is connected with the compressor 31 through the temperature control valve 34 to form a loop, the other end of the temperature control valve 34 is connected with the cooling device 4, and an oil outlet end of the oil-gas separator 33 is connected with the compressor 31 through the third check valve 35. The oil in the oil tank 32 is injected into the compressor 31 to be mixed with the gas when the compressor 31 is operated, the compressed oil is transferred into the oil tank 32 to be subjected to preliminary oil-gas separation, most of the oil is returned into the oil tank 32, the gas with a small amount of oil is sent into the oil-gas separator 33, the residual oil is separated from the gas, the oil is returned into the compressor 31 through the third check valve 35, and the gas is sent into the cooling device 4 through the first check valve 5 to be cooled. When the temperature control valve 34 senses the increase of the oil temperature, the temperature control valve 34 changes the conveying direction, and the oil is sent to the cooling device 4, cooled and then injected into the compressor 31. Preferably, an oil gas filter 36 is disposed at the front end of the oil inlet of the compressor 31 to filter oil.
In an embodiment, the air intake pipe 26 is connected to the intake buffer 11 tank through a third valve 61 and a second check valve 62, and further includes a third valve 61 and a second check valve 62. This structure is used in the shutdown phase in order to vent the remaining gas in the compression device 3 back into the intake buffer tank 11. The third valve 61 may be a solenoid valve, which controls the on-off of the end pipeline; the second check valve 62 serves to prevent the discharged gas from flowing back into the compression device 3.
In one embodiment, a minimum pressure valve 64 is provided between the outlet end of the compression device 3 and the first check valve 5. The function of the minimum pressure valve 64 is that the minimum pressure valve 64 will open to allow the passage of gas after the gas reaches the operating pressure of the minimum pressure valve 64; the first check valve 5 only plays a role of preventing backflow; by the cooperation of the first check valve 5 and the minimum pressure valve 64, the accuracy of the gas pressure of the compression device 3 is improved.
In a preferred embodiment, the take-off point of the take-off line 26 is between the outlet end of the compression device 3 and the minimum pressure valve 64. The minimum pressure valve 64 ensures that the gas can pass through after reaching the working pressure, so that the gas taking point is arranged in front of the minimum pressure valve 64, and the pressure of the instrument wind of the pneumatic ball valve 21 can be ensured to be changed according to actual conditions; it is assumed that when the pressure of the gas compressed by the compression device 3 drops, the pressure cannot open the start valve 21, and at this time, the bypass line 25 is opened to perform gas transmission, so that the compression device 3 enters a low-load state; the pressure at the rear end of the minimum pressure valve 64 is always low at the initial stage of starting the compression device 3, the pneumatic ball valve 21 cannot be opened, and only after the gas at the front end of the minimum pressure valve 64 reaches the working pressure, the gas is transmitted to the rear end, so that a long time is required for the process, the compression device 3 is in a low-load state for a long time, the compression efficiency is low, and the energy consumption is wasted.
In one embodiment, the vent buffer tank 12 is externally connected to a safety valve 65. When the pressure in the air-out buffer tank 12 exceeds the pressure of the safety valve 65, the air in the air-out buffer tank 12 is discharged from the safety valve 65, so that the safety of the equipment is ensured. In a preferred embodiment, a pressure regulating valve 66 is also included, and the exhaust buffer tank 12 is connected to the intake buffer tank 11 through the pressure regulating valve 66. When the air pressure in the air-out buffer tank 12 is larger than the working pressure of the pressure regulating valve 66 and smaller than the pressure of the safety valve 65, the air in the air-out buffer tank 12 is discharged into the air-in buffer tank 11 through the pressure regulating valve 66, so that the air waste is avoided, and the air is directly discharged into the control to cause pollution.
In one embodiment, the air outlet of the air inlet buffer tank 11 is provided with a filtering device 67 for filtering air to prevent impurities from entering the back-end equipment and damaging the equipment.
The invention also discloses a natural gas compression method, which comprises the following steps:
s1, an air source is connected into an air inlet buffer tank 11, a first valve 22 and a second valve 23 are opened, at the moment, a main pipeline 24 is disconnected, a bypass pipeline 25 is connected, and a compression device 3 is operated; the gas enters the compression device 3 through the side pipe 25, and at this time, the gas is a small amount of gas, and the compression device 3 is in a low-load starting state.
S2, through the operation of the compression device 3, the gas in the pipeline is compressed, the air pressure at the rear end of the compression device 3 is increased, the air pressure at the air taking point of the air taking pipeline 26 is increased, the gas is conveyed into the pneumatic ball valve 21 through the air taking pipeline 26 and the second valve 23, the main pipeline 24 is in a passage way, and the cooling device 4 is started; at this time, the air pressure at the rear end of the compression device 3 reaches the normal working pressure, the compression device enters the normal compression state, and the main pipeline 24 is opened to enter the heavy load state for working.
S3, entering a normal compression stage, conveying compressed gas into the gas outlet buffer tank 1, and then discharging the gas into the gas collection tank;
s4, after other compression is finished, the air source is cut off and then the machine is stopped.
Wherein, the pre-stop is performed before stopping in step S4, and the pre-stop includes closing the second valve 23, opening the first valve 22, reducing the output power of the compression device 3 to below 10%, and operating for at least 30 seconds. This step can press a small amount of the residual oil in the oil separator 33 into the compressor 31, thus greatly reducing the oil consumption, reducing the oil content in the exhaust gas, and increasing the life of the oil separator 33.
In step S4, after the equipment is shut down, the first valve 22 is closed, and the third valve 61 is opened. This allows the gas in the compression device 3 to be returned to the intake buffer tank 11 through the gas taking pipe 26 via the third valve and the second check valve 62. The air inlet device 2 is cut off, the air in the air inlet buffer tank 11 is not transmitted to the back-end equipment, and the oil-free air is transmitted into the air inlet buffer tank 1 after the air in the compression device 3 is subjected to oil-gas separation; the gas recovery and the oil recovery are realized, and all parts are cut off, so that the safety of the whole device is protected.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention; modifications and equivalent substitutions are intended to be included in the scope of the claims without departing from the spirit and scope of the present invention.
Claims (8)
1. The natural gas compressor is characterized by comprising a buffer tank, an air inlet device, a compression device and a cooling device, wherein the buffer tank comprises an air inlet buffer tank and an air outlet buffer tank, and the air inlet buffer tank, the air inlet device, the compression device, the cooling device and the air outlet buffer tank are sequentially connected;
the air inlet device comprises a pneumatic ball valve, a first valve, a second valve, a main pipeline, a bypass pipeline and an air taking pipeline, wherein both ends of the main pipeline and both ends of the bypass pipeline are connected with the air inlet buffer tank and the compression device, the pneumatic ball valve is connected in the main pipeline in series, the first valve is connected in the bypass pipeline in series, the second valve is connected with an air outlet end of the compression device through the air taking pipeline, and gas compressed by the compression device is used as instrument wind to control the connection and disconnection of the pneumatic ball valve through the second valve;
the air outlet end of the compression device is connected with the cooling device through a first check valve;
the air taking pipeline is connected with the air inlet buffer tank through the third valve and the second check valve;
and a minimum pressure valve is arranged between the air outlet end of the compression device and the first check valve.
2. A natural gas compressor as claimed in claim 1, wherein the gas take-off point of the gas take-off line is between the gas outlet end of the compression device and the minimum pressure valve.
3. A natural gas compressor as defined in claim 1, wherein said gas-out buffer tank is externally connected with a safety valve.
4. A natural gas compressor as claimed in claim 3, further comprising a pressure regulating valve, said outlet buffer tank being connected to said inlet buffer tank by said pressure regulating valve.
5. A natural gas compressor according to any one of claims 1 to 4, wherein the outlet of the inlet buffer tank is provided with a filter means.
6. A method of natural gas compression comprising the steps of:
s1, an air source is connected into an air inlet buffer tank, a first valve and a second valve are opened, at the moment, a main pipeline is not opened, a side pipeline is opened, and a compression device is started under low load;
s2, through the operation of the compression device, the gas in the pipeline is compressed, the air pressure is increased, the air pressure of an air taking point of the air taking pipeline is increased, the gas is conveyed into the pneumatic ball valve through the air taking pipeline and the second valve, the main pipeline is opened, and the cooling device is started;
s3, entering a normal compression stage, conveying compressed gas into an air outlet buffer tank, and then discharging the compressed gas into an air collection tank;
s4, after other compression is finished, the air source is cut off and then the machine is stopped.
7. The method of claim 6, wherein the pre-shutdown is performed before the shutdown in step S4, and the pre-shutdown includes closing the second valve, opening the first valve, and reducing the output power of the compression device to less than 10%, and operating for at least 30 seconds.
8. The method according to claim 6, wherein in step S4, after the equipment is shut down, the first valve is closed and the third valve is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811418879.6A CN109595138B (en) | 2018-11-26 | 2018-11-26 | Natural gas compressor and compression method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811418879.6A CN109595138B (en) | 2018-11-26 | 2018-11-26 | Natural gas compressor and compression method |
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| Publication Number | Publication Date |
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| CN109595138A CN109595138A (en) | 2019-04-09 |
| CN109595138B true CN109595138B (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811418879.6A Active CN109595138B (en) | 2018-11-26 | 2018-11-26 | Natural gas compressor and compression method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10225774C1 (en) * | 2002-06-10 | 2003-12-11 | Vacuubrand Gmbh & Co Kg | Vacuum pump, for condensing and aggressive gases, is a dry pump with a membrane pump stage and a spiral scroll pump stage |
| CN105464931A (en) * | 2015-12-23 | 2016-04-06 | 开封中化换热设备有限公司 | Energy-saving and electricity-saving gas compression system |
| CN205243764U (en) * | 2015-12-23 | 2016-05-18 | 开封中化换热设备有限公司 | Energy -conserving economize on electricity gas compression system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8313311B2 (en) * | 2009-06-05 | 2012-11-20 | Karcher North America, Inc. | Adjustable unloader valve |
-
2018
- 2018-11-26 CN CN201811418879.6A patent/CN109595138B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10225774C1 (en) * | 2002-06-10 | 2003-12-11 | Vacuubrand Gmbh & Co Kg | Vacuum pump, for condensing and aggressive gases, is a dry pump with a membrane pump stage and a spiral scroll pump stage |
| CN105464931A (en) * | 2015-12-23 | 2016-04-06 | 开封中化换热设备有限公司 | Energy-saving and electricity-saving gas compression system |
| CN205243764U (en) * | 2015-12-23 | 2016-05-18 | 开封中化换热设备有限公司 | Energy -conserving economize on electricity gas compression system |
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| CN109595138A (en) | 2019-04-09 |
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