CN218971365U - Four-row one-stage compression large-sized vertical piston oxygen compressor - Google Patents
Four-row one-stage compression large-sized vertical piston oxygen compressor Download PDFInfo
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- CN218971365U CN218971365U CN202222258779.XU CN202222258779U CN218971365U CN 218971365 U CN218971365 U CN 218971365U CN 202222258779 U CN202222258779 U CN 202222258779U CN 218971365 U CN218971365 U CN 218971365U
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000001301 oxygen Substances 0.000 title claims abstract description 48
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 48
- 230000006835 compression Effects 0.000 title claims abstract description 19
- 238000007906 compression Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 50
- 238000007789 sealing Methods 0.000 claims description 12
- 230000033001 locomotion Effects 0.000 claims description 10
- 239000010687 lubricating oil Substances 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 229910001060 Gray iron Inorganic materials 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 239000000341 volatile oil Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 239000010779 crude oil Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910000792 Monel Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to a four-row one-stage compression large-sized vertical piston oxygen compressor, which consists of a machine body, a crank case, a crank shaft, a connecting rod, a cross head, a cylinder, a piston, an oil wiper, a sealer, an air inlet filter, a buffer, a cooler, an air water pipeline system, a pipeline valve, a safety valve, a shaft head pump, an oil station, a motor, a flywheel coupling, an oil vapor suction device, an explosion-proof wall, a compressor control system and the like.
Description
Technical Field
The utility model relates to a four-row one-stage compression large-sized vertical piston oxygen compressor, and belongs to the technical field of piston oxygen compressors.
Background
The oxygen compressor is a compressor for pressurizing and conveying oxygen, a vertical piston oxygen compressor is generally adopted in the factory at present, but the existing vertical piston oxygen compressor is low in working efficiency due to small exhaust capacity, cannot meet the increasing production demand, and the large vertical piston oxygen compressor with the exhaust capacity of 40000 Nm/h, the air inlet pressure of 1.0MPa (G) and the exhaust pressure of 2.5MPa (G) is blank in China, and if the large vertical piston oxygen compressor with the specification is produced, a plurality of potential safety hazards are easy to generate due to the increase of the exhaust capacity, therefore, the size and the safety of the exhaust capacity of the existing vertical piston oxygen compressor are required to be correspondingly adjusted and upgraded, and the four-row one-stage compression large vertical piston oxygen compressor is designed to overcome the problems.
Disclosure of Invention
The utility model aims to fill the blank of a vertical piston oxygen compressor with the domestic exhaust capacity of 40000N m m/h, the air inlet pressure of 1.0MPa (G) and the exhaust pressure of 2.5MPa (G), and provides a four-row one-stage compression, continuous stable operation, energy conservation and high efficiency large-scale vertical piston oxygen compressor.
The utility model aims at completing the technical scheme that the four-row one-stage compression large-scale vertical piston oxygen compressor comprises a machine body, a crank case, a crank shaft, a connecting rod, a cross head, a cylinder, a piston, an oil wiper, a sealer, an air inlet filter, a buffer and a cooler A, a cooler B, an air water pipeline system, a pipeline valve, a safety valve, a spindle nose pump and a power system, wherein the cylinder comprises a cylinder A and a cylinder B, the buffer comprises a buffer A, a buffer B, a buffer C and a buffer D, the air water pipeline system comprises a first air water pipeline system and a second air water pipeline system, the cooler comprises a cooler A and a cooler B, the cylinder A and the cylinder B are cast by gray cast iron, and are vertically arranged on the machine body by high-strength bolts; the machine body is connected with the crankcase through a double-end stud, the crankshaft is arranged on the crankcase, the connecting rod and the cross head are sequentially arranged on the crankshaft, and the connecting rod and the cross head are driven by the rotation of the crankshaft to realize the compression work of the reciprocating motion of the piston in the top piston cavity on the medium; a sealer is arranged below the piston cavity, one sides of the cylinder A and the cylinder B are connected with a power system, the other sides of the cylinder A and the cylinder B are connected with an oil station through a shaft head pump, the power system consists of a motor and a flywheel coupling, and the motor drives the flywheel coupling to drive a compressor to move; the oil station consists of an auxiliary oil pump driven by a motor, an oil cooler, an essential oil filter and a valve instrument, wherein the spindle head pump and the auxiliary oil pump absorb oil from the crankcase through a crude oil filter arranged in the crankcase, and lubricating oil is cooled through the oil cooler after being pressurized by the oil pump and then enters the movement mechanism after passing through the essential oil filter; the compressor adopts four rows of first-stage vertical piston structures, the cylinders are cast into a whole in pairs, gas enters the compressor unit, then enters the two cylinders in a split way, enters the aftercoolers for cooling after being compressed, and is then merged into a main pipe for discharging.
As preferable: and one side of each of the air cylinder A and the air cylinder B is also provided with an inlet valve A, the inlet valve A is filtered by an air inlet filter and then is divided into two paths, the two paths enter the buffer A respectively, the buffer B enters the air cylinder A, the air cylinder B enters the air cylinder A, the oxygen in the air cylinder B is compressed and then enters the cooler A through the exhaust buffer B and the buffer C, the cooler B is cooled, the cooled oxygen is discharged from the cooler and then is combined into one path to be discharged from an exhaust valve of the compressor, the exhaust capacity of the compressor is 30000-40000 Nm < 3 >/h, the air inlet pressure is 0.8-1.0 MPa (G), and the exhaust pressure is 2.0-2.5 MPa (G).
As preferable: the cylinder A and the cylinder B are water jacket cylinders and can be cooled by water, the wall temperature of the cylinders is reduced, the cylinders are provided with cylinder liners, the air inlet and outlet valves of the cylinders are closed type net valves, the cylinder bodies are cast by gray cast iron, the strength is enough, and all the cylinders are vertically arranged on a machine body by special high-strength bolts.
As preferable: the piston mainly comprises a piston body, a piston rod, a guide ring, a piston ring, an oil baffle disc and other parts, all the piston body is made of copper alloy castings, the piston ring and the support ring are made of special filling polytetrafluoroethylene for oxygen media, the service life and the equipment use safety are prolonged, the oil baffle disc is arranged on the piston rod, and an oil-resistant rubber ring is tightly clamped with the piston rod, so that oil is prevented from entering the cylinder along the piston rod.
As preferable: the oil wiper is arranged on the machine body and comprises an oil wiper body, an oil retainer, an oil scraper ring and a sealing ring, wherein lubricating oil carried on a piston rod can be sealed in the machine body in the movement process of the piston by the oil wiper, so that the lubricating oil is prevented from leaking out of a cylinder receiving barrel, and the safe operation and the cleaning of equipment are ensured.
As preferable: the sealing device is arranged at the inlet of the lower part of the cylinder cavity to realize the shaft seal of the piston rod, and consists of a choke ring, five main sealing rings and a leakage sealing ring, all rings are made of special filling polytetrafluoroethylene for oxygen media, each sealing device is provided with a vent, leaked oxygen is collected and connected to the outdoor vent, and the safety operation of the equipment is ensured while the purity of the oxygen in the equipment is ensured.
As preferable: the air inlet filter is of a cylindrical structure, the conical filter core is arranged in the filter cylinder, the filter screen is made of pure nickel and Monel materials, and the air inlet filter has excellent oxygen compatibility.
As preferable: the cooler A and the cooler B are stuffing type efficient coolers, efficient inner finned tubes are used, the outer tube material of the heat exchange tubes is copper-nickel alloy material, the fins and the inner tube material are red copper, the strength is enough, the heat exchange effect and the corrosion resistance are good, the compressor is provided with two aftercoolers, a gas tube pass and a water shell pass.
The utility model fills the blank of the vertical piston oxygen compressor with the domestic exhaust gas capacity of 40000 Nm/h and the air inlet pressure of 1.0MPa (G) and the exhaust gas pressure of 2.5MPa (G), reduces the number and the length of the heat exchange pipes on the premise of ensuring the heat exchange effect, and saves the material cost.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a piping connection diagram of the present utility model.
Detailed Description
The utility model will be described in detail below with reference to the attached drawings: as shown in fig. 1, the four-row primary compression large-sized vertical piston oxygen compressor consists of a machine body 4, a crank case 1, a crank shaft 3, a connecting rod 5, a cross head 6, a cylinder, a piston 10, an oil wiper 7, a sealer 8, an air inlet filter 14, a buffer and a cooler A19, wherein the cylinder consists of a cylinder A9 and a cylinder B11, the buffer consists of a buffer A15, a buffer B16, a buffer C17 and a buffer D18, the air water pipeline system consists of a first air water pipeline system 29 and a second air water pipeline system 30, the cooler consists of a cooler A19 and a cooler B20, the cylinder A9 and the cylinder B11 are cast by gray cast iron and are vertically arranged on the machine body 4 by high-strength bolts; the machine body 4 is connected with the crank case 1 through a double-end stud, the crank shaft 3 is arranged on the crank case 1, the connecting rod 5 and the cross head 6 are sequentially arranged on the crank shaft 3, and the crank shaft 3 rotates to drive the connecting rod 5 and the cross head 6 to realize compression work on a medium by reciprocating motion of a piston 10 in a top piston cavity; a sealer 8 is arranged below the piston cavity, one sides of the cylinder A9 and the cylinder B11 are connected with a power system, the other sides of the cylinder A9 and the cylinder B11 are connected with an oil station 21 through a spindle nose pump 2, the power system consists of a motor 13 and a flywheel coupling 12, and the motor 13 drives the flywheel coupling 12 to drive a compressor to move; the oil station 21 consists of an auxiliary oil pump driven by a motor, an oil cooler, an essential oil filter and a valve instrument, wherein the spindle head pump 2 and the auxiliary oil pump absorb oil from a crankcase through a crude oil filter arranged in the crankcase, and lubricating oil is cooled through the oil cooler after being pressurized by the oil pump and then enters a movement mechanism after passing through the essential oil filter; the compressor adopts four rows of first-stage vertical piston structures, the cylinders are cast into a whole in pairs, gas enters the compressor unit, then enters the two cylinders in a split way, enters the aftercoolers for cooling after being compressed, and is then merged into a main pipe for discharging.
As shown in fig. 2, an inlet valve a23 is further disposed at one side of the cylinder A9 and the cylinder B11, the inlet valve a23 is filtered by the air inlet filter 14 and then divided into two paths, the two paths are respectively led into the buffer a15, the buffer B16 is led into the cylinder A9, the air in the cylinder B11 is led into the cylinder A9, the oxygen in the cylinder B11 is compressed and then led into the cooler a19 after being led into the buffer C17, the cooled oxygen is cooled by the cooler B20, the cooled oxygen is discharged from the cooler and then is combined into one path to be discharged from the compressor exhaust valve 24, the compressor exhaust capacity is 30000-40000 nm/h, the air inlet pressure is 0.8-1.0 MPa (G), and the exhaust pressure is 2.0-2.5 (G).
The cylinder A9 and the cylinder B11 are water jacket cylinders, water can be introduced and cooled, the wall temperature of the cylinders is reduced, the cylinders are provided with cylinder liners, the air inlet and outlet valves of the cylinders are closed type mesh valves, the cylinder body is cast by gray cast iron, the strength is enough, and all the cylinders are vertically arranged on a machine body by special high-strength bolts.
The piston 10 mainly comprises a piston body, a piston rod, a guide ring, a piston ring, an oil baffle disc and other parts, all the piston body is made of copper alloy castings, the piston ring and the support ring are made of special filling polytetrafluoroethylene for oxygen media, the service life and the equipment use safety are improved, the oil baffle disc is arranged on the piston rod, and an oil-resistant rubber ring is tightly clamped with the piston rod, so that oil is prevented from entering a cylinder along the piston rod.
The oil wiper 7 is arranged on the machine body 4 and comprises an oil wiper body, an oil retainer, an oil scraper ring and a sealing ring, wherein lubricating oil carried on a piston rod can be sealed in the machine body in the movement process of the piston by the oil wiper, so that the lubricating oil is prevented from leaking out of a cylinder receiving barrel, and the safe operation and the cleaning of equipment are ensured.
The sealers 8 are arranged at the inlet of the lower part of the cylinder cavity to realize the shaft seal of the piston rod, each sealer consists of a choke ring, five main sealing rings and a leakage sealing ring, all rings are made of special filling polytetrafluoroethylene for oxygen media, each sealer is provided with a vent, leaked oxygen is collected and connected to the outdoor vent, and the safety operation of the equipment is ensured while the purity of the oxygen in the equipment is ensured.
The intake filter 14 has a cylindrical structure, a conical filter core is arranged in the filter cylinder, and a filter screen is made of pure nickel and monel materials and has excellent oxygen compatibility.
The cooler A19 and the cooler B20 are stuffing type efficient coolers, efficient inner finned tubes are used, the outer tube material of the heat exchange tubes is copper-nickel alloy material, the fins and the inner tube material are red copper, the strength is enough, the heat exchange effect and the corrosion resistance are good, the compressor is provided with two aftercoolers, a gas tube pass and a water shell pass.
Reference numerals 25 and 26 in the drawings denote inlet valves.
Safety valve A27 and safety valve B28 are arranged at the inlet and outlet of the compressor to ensure the safe operation of the equipment. The air inlet, the air exhaust, the reflux and the air discharge are all automatic valves, so that the brake control of the valves is realized. The outlet of the compressor is also provided with a check valve which is a net valve plate type check valve.
The motor 13 is connected to the compressor crankshaft 3 via a flywheel coupling 12.
The explosion-proof wall is in a reinforced concrete structure, surrounds the periphery of the compressor and is open at the top. And when the oxygen compressor operates, personnel are prohibited from entering the explosion-proof wall, so that the safety of equipment and personnel is ensured to the maximum extent.
The instrument electric control system detects a series of operation parameters such as temperature, pressure difference, flow and the like of each measuring point of the compressor, and carries out a series of complex control such as transmission, display, recording, alarm, interlocking and the like of the operation parameters, wherein the alarm and the interlocking are used for carrying out calculation, analysis and setting corresponding alarm and interlocking values on each working condition at the initial stage of the design of the compressor, so that the equipment can automatically judge whether the operation is normal or not, the instrument electric control system carries out alarm parallel lock control on abnormal operation conditions and can respond at the first time, and the safe and stable operation of the equipment is ensured.
The utility model adopts four rows of one-stage double-acting vertical piston machine types, and designs a brand new motion mechanism, a lubricating oil system, a cooling system, a pipeline system, an instrument control system and a safety device of the compressor. The product greatly improves the safety and the working efficiency of equipment on the premise of ensuring the exhaust quantity and the exhaust pressure, and provides a safer and more economical choice for users.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.
Claims (8)
1. The utility model provides a four-row one-level compression large-scale vertical piston oxygen compressor, it comprises fuselage (4), crankcase (1), bent axle (3), connecting rod (5), cross (6), cylinder, piston (10), oil wiper (7), sealer (8), filter (14) that admits air, buffer, cooler A (19), cooler B (20), gas water piping system, pipeline valve, relief valve, spindle nose pump (2), driving system (22), its characterized in that: the air cylinder consists of an air cylinder A (9) and an air cylinder B (11), the buffer consists of a buffer A (15), a buffer B (16), a buffer C (17) and a buffer D (18), the air water pipeline system consists of a first air water pipeline system (29) and a second air water pipeline system (30), the cooler consists of a cooler A (19) and a cooler B (20), the air cylinder A (9) and the air cylinder B (11) are cast by gray cast iron, and the air cylinder A (9) and the air cylinder B (11) are vertically arranged on a machine body (4) by high-strength bolts; the machine body (4) is connected with the crankcase (1) through a double-end stud, the crankshaft (3) is arranged on the crankcase (1), the connecting rod (5) and the cross head (6) are sequentially arranged on the crankshaft (3), and the crankshaft (3) rotates to drive the connecting rod (5) and the cross head (6) to realize compression work on a medium by reciprocating motion of a piston (10) in a top piston cavity; a sealer (8) is arranged below the piston cavity, one side of each cylinder A (9) and one side of each cylinder B (11) are connected with a power system, the other side of each cylinder A and one side of each cylinder B are connected with an oil station (21) through a shaft head pump (2), the power system consists of a motor (13) and a flywheel coupling (12), and the motor (13) drives the flywheel coupling (12) to drive the compressor to move; the oil station (21) consists of an auxiliary oil pump driven by a motor, an oil cooler, an essential oil filter and a valve instrument, wherein the spindle head pump (2) and the auxiliary oil pump absorb oil from the crankcase through a crude oil filter arranged in the crankcase, and lubricating oil is pressurized by the oil pump, cooled by the oil cooler and then enters the movement mechanism through the essential oil filter; the compressor adopts four rows of first-stage vertical piston structures, the cylinders are cast into a whole in pairs, gas enters the compressor unit, then enters the two cylinders in a split way, enters the aftercoolers for cooling after being compressed, and is then merged into a main pipe for discharging.
2. The four-row one-stage compression large vertical piston oxygen compressor of claim 1, wherein: an inlet valve A (23) is further arranged on one side of each of the air cylinder A (9) and the air cylinder B (11), the air inlet valve A (23) is filtered by an air inlet filter (14) and then divided into two paths, the two paths are respectively led into a buffer A (15), the air enters the air cylinder A (9) after entering the air cylinder B (11), oxygen in the air cylinder B (11) is compressed and then enters a cooler A (19) after passing through an exhaust buffer B (16), a buffer C (17) and then enters a cooler B (20) for cooling, the cooled oxygen is discharged from the cooler and then is combined into one path to be discharged from a compressor exhaust valve (24), the exhaust capacity of the compressor is 30000-40000N m/h, the air inlet pressure is 0.8-1.0 MPa (G), and the exhaust pressure is 2.0-2.5 MPa (G).
3. The four-row one-stage compression large vertical piston oxygen compressor of claim 1 or 2, wherein: the air cylinder A (9) and the air cylinder B (11) are water jacket air cylinders, water can be introduced and cooled, the wall temperature of the air cylinders is reduced, the air cylinders are all provided with cylinder liners, the air cylinders are all closed type net valves, the air cylinders are cast by gray cast iron, the strength is enough, and all the air cylinders are vertically arranged on a machine body by special high-strength bolts.
4. The four-row one-stage compression large vertical piston oxygen compressor of claim 1, wherein: the piston (10) comprises a piston body, a piston rod, a guide ring, a piston ring and an oil baffle disc part, all the piston bodies are copper alloy castings, the piston ring and the support ring are made of special filling polytetrafluoroethylene for oxygen media, the service life and the equipment use safety are prolonged, the oil baffle disc is arranged on the piston rod, and an oil-resistant rubber ring is tightly clamped with the piston rod, so that oil is prevented from entering the cylinder along the piston rod.
5. The four-row one-stage compression large vertical piston oxygen compressor of claim 1, wherein: the oil wiper (7) is arranged on the machine body (4), so that lubricating oil carried on a piston rod can be sealed in the machine body in the movement process of the piston, and the lubricating oil is prevented from leaking out of the cylinder to connect the cylinder, so that the safe operation and the cleaning of equipment are ensured.
6. The four-row one-stage compression large vertical piston oxygen compressor of claim 1, wherein: the sealing device (8) is arranged at the inlet of the lower part of the cylinder cavity to realize the shaft seal of the piston rod, and consists of a choke ring, five main sealing rings and a leakage sealing ring, all rings are made of special filling polytetrafluoroethylene for oxygen media, each sealing device is provided with a vent, leaked oxygen is collected and connected to the outdoor vent, and the safety operation of the device is ensured while the purity of the oxygen in the device is ensured.
7. The four-row one-stage compression large vertical piston oxygen compressor of claim 1, wherein: the air inlet filter (14) is of a cylindrical structure, and the conical filter core is arranged in the filter cylinder.
8. The four-row one-stage compression large vertical piston oxygen compressor of claim 1, wherein: the cooler A (19) and the cooler B (20) are stuffing type efficient coolers, efficient inner finned tubes are used, the outer tube material of the heat exchange tubes is copper-nickel alloy material, the fins and the inner tube material are red copper, the strength is enough, the heat exchange effect and the corrosion resistance are good, the compressor is provided with two aftercoolers, and the shell pass is carried out by gas and water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222258779.XU CN218971365U (en) | 2022-08-26 | 2022-08-26 | Four-row one-stage compression large-sized vertical piston oxygen compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222258779.XU CN218971365U (en) | 2022-08-26 | 2022-08-26 | Four-row one-stage compression large-sized vertical piston oxygen compressor |
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| CN218971365U true CN218971365U (en) | 2023-05-05 |
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| CN202222258779.XU Active CN218971365U (en) | 2022-08-26 | 2022-08-26 | Four-row one-stage compression large-sized vertical piston oxygen compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117948264A (en) * | 2024-03-25 | 2024-04-30 | 西南石油大学 | A polymer shear-resistant four-chamber multifunctional injection pump |
-
2022
- 2022-08-26 CN CN202222258779.XU patent/CN218971365U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117948264A (en) * | 2024-03-25 | 2024-04-30 | 西南石油大学 | A polymer shear-resistant four-chamber multifunctional injection pump |
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