CN112594241A - Hydraulic system - Google Patents
Hydraulic system Download PDFInfo
- Publication number
- CN112594241A CN112594241A CN202011614668.7A CN202011614668A CN112594241A CN 112594241 A CN112594241 A CN 112594241A CN 202011614668 A CN202011614668 A CN 202011614668A CN 112594241 A CN112594241 A CN 112594241A
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- Prior art keywords
- oil
- intercommunication
- air duct
- oil pump
- hydraulic system
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- 239000007789 gas Substances 0.000 claims description 23
- 239000011261 inert gas Substances 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 4
- 229910052743 krypton Inorganic materials 0.000 claims description 3
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 85
- 239000010720 hydraulic oil Substances 0.000 description 10
- 238000004891 communication Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to the technical field of hydraulic systems, in particular to a hydraulic system, which comprises an actuating element and an oil pump, wherein the left end of the oil pump is communicated with a communicating pipe, the left end of the communicating pipe is communicated with the actuating element, the right part of the oil pump is communicated with an oil conveying pipe, the top end of the oil conveying pipe is communicated with an oil tank, the oil tank is a closed container, the top end of the oil tank is provided with an inflation valve, the inflation valve is provided with an inflation inlet, the inflation inlet is communicated with a first air duct, the first air duct is communicated with a two-position three-way electromagnetic valve, the two-position three-way electromagnetic valve is provided with a P port, an R port and an S port, the P port is communicated with the first air duct, the S port is communicated with a second air duct, the other end of the second air duct is communicated with; the oil absorption is smoother, the condition of insufficient oil absorption is reduced, the efficiency of the hydraulic system is greatly improved, and the service life of elements in the hydraulic system is also greatly prolonged.
Description
Technical Field
The invention relates to the technical field of hydraulic systems, in particular to a hydraulic system.
Background
The traditional hydraulic system consists of an open oil tank unit (comprising hydraulic oil, an air exchanger, a heater, a liquid level device and the like), a power unit (comprising an oil pump, a motor and the like), a control unit (comprising a control software unit, a switch valve, a pressure valve, a flow valve and the like), and an execution unit (comprising an oil cylinder system, a motor system and the like).
In the prior domestic market, an oil pump in a power unit sucks hydraulic oil into the oil pump from an oil tank through an oil suction pipe by self-suction, and then high-pressure oil is conveyed to an execution unit through a control unit to complete the use function of the hydraulic system.
Through search, patent publication No. CN206104821U discloses a vertical parting molding machine, which comprises a positive pressure plate assembly, a negative pressure plate assembly, a molding chamber, a sand shooting system and a hydraulic system, wherein the positive pressure plate assembly comprises a positive pressure plate fixedly connected with a first cylinder body; the back pressure plate component comprises a back pressure plate fixedly connected with the second cylinder body; wherein, this hydraulic system includes: the energy supply device comprises an energy supply device, an open or closed pump, an electronic control valve and an energy storage device; the utility model discloses can improve the energy availability factor of perpendicular somatotype molding machine.
However, this system has the disadvantage that the air exchange device for exchanging with the outside air is provided in the oil tank system, so that moisture or fine impurities of the air can enter the oil tank system to contaminate the hydraulic oil in the oil tank, thereby increasing the failure rate of the hydraulic system and reducing the service life of the hydraulic oil.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the hydraulic system which can absorb oil more smoothly, reduce the situation of insufficient oil absorption, improve the efficiency of the hydraulic system and prolong the service life of elements in the hydraulic system.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a hydraulic system comprises an actuating element and an oil pump, wherein the left end of the oil pump is communicated with a communicating pipe, the left end of the communicating pipe is communicated with the actuating element, the right part of the oil pump is communicated with an oil conveying pipe, the top end of the oil conveying pipe is communicated with an oil tank, the oil tank is a closed container, the top end of the oil tank is provided with an inflation valve, the inflation valve is provided with an inflation inlet, the inflation inlet is communicated with a first air duct, the first air duct is communicated with a two-position three-way electromagnetic valve, the two-position three-way electromagnetic valve is provided with a P port, an R port and an S port, the P port is communicated with the first air duct, the S port is communicated with a second air duct, the other end of the second air duct is communicated with a pressure pump, the air inlet end of the pressure pump is communicated with a third air duct, the left end of the third air duct is communicated, the upper portion intercommunication of gas storage box has the fourth air duct, the other end intercommunication of fourth air duct has the aspirator pump, the inlet end and the R mouth of aspirator pump pass through the fifth air duct intercommunication, first pressure sensor is installed on the upper portion of oil tank, control panel is installed to the right-hand member of oil tank, first pressure sensor, two-position three-way solenoid valve, aspirator pump and force (forcing) pump all with control panel electricity is connected.
Preferably, a liquid level sensor is installed at the top end of the oil tank, a control electromagnetic valve is installed in the middle of the inflation valve, and the control electromagnetic valve is electrically connected with the control panel.
Preferably, the oil pump comprises a first oil pump and a second oil pump, a first communicating pipe is communicated with the left end of the first oil pump, a second communicating pipe is communicated with the left end of the second oil pump, two actuating elements are arranged, and the left end of the first communicating pipe and the left end of the second communicating pipe are respectively communicated with each corresponding actuating element; two executive components are controlled through the first oil pump and the second oil pump respectively, power is provided for different structures simultaneously, and the switch valves are installed in the middle of the first communicating pipe and the middle of the second communicating pipe.
Preferably, the middle parts of the first communicating pipe and the second communicating pipe are respectively provided with a switch valve; different hydraulic pipelines are controlled by the switch valve, so that the starting and stopping of different executing elements are controlled conveniently, and the practicability is improved.
Preferably, the first oil pump and the second oil pump are communicated, the first oil pump is connected with a motor, and the motor is electrically connected with the control panel.
Preferably, a second pressure sensor is installed on the inner wall of the gas storage box, a controller is installed at the bottom of the left end of the gas storage box, an alarm is installed at the top end of the gas storage box, and the alarm is electrically connected with the controller.
Preferably, the inert gas is krypton.
(III) advantageous effects
Compared with the prior art, the invention provides a hydraulic system, which has the following beneficial effects:
the invention provides a hydraulic system, which changes the traditional open oil tank into a closed oil tank, eliminates an air exchanger exchanging with air in the traditional hydraulic system, isolates the inside of the oil tank from the external environment, is provided with an inflation valve, the inert gas with certain pressure is filled into the oil tank through the charging valve, so that the external air, moisture and impurities can not enter the oil tank, the hydraulic oil will not be polluted by the outside, the failure rate will be reduced, the service life of the hydraulic oil will be greatly prolonged, because the rushing inert gas has certain pressure, the pressure in the oil tank is higher than the external pressure, the installation of the power unit is not influenced by the installation position, the high-pressure inert gas can press the hydraulic oil into the oil suction port of the hydraulic pump, the oil suction is smoother, the condition of insufficient oil suction is reduced, the efficiency of the hydraulic system can be greatly improved, and the service life of elements in the hydraulic system can also be greatly prolonged.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic circuit diagram of the present invention;
FIG. 3 is a circuit diagram of the present invention.
In the figure: 1. an actuator; 2. an oil pump; 3. a communicating pipe; 4. an oil delivery pipe; 5. an oil tank; 6. an inflation valve; 7. a first air duct; 8. a two-position three-way electromagnetic valve; 9. a second air duct; 10. a pressure pump; 11. A third air duct; 12. a gas storage tank; 13. a fourth gas-guide tube; 14. a getter pump; 15. a first pressure sensor; 16. a control panel; 17. a liquid level sensor; 18. controlling the electromagnetic valve; 19. a first oil pump; 20. a second oil pump; 21. a first communication pipe; 22. a second communicating pipe; 23. an on-off valve; 24. a motor; 25. a second pressure sensor; 26. a controller; 27. an alarm; 28. and a fifth air duct.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
referring to fig. 1-3, a hydraulic system includes an actuator 1 and an oil pump 2, a communication pipe 3 is connected to a left end of the oil pump 2, a left end of the communication pipe 3 is connected to the actuator 1, a right portion of the oil pump 2 is connected to an oil delivery pipe 4, a top end of the oil delivery pipe 4 is connected to an oil tank 5, the oil tank 5 is a closed container, the oil pump 2 includes a first oil pump 19 and a second oil pump 20, a left end of the first oil pump 19 is connected to a first communication pipe 21, a left end of the second oil pump 20 is connected to a second communication pipe 22, the actuator 1 is provided with two, and a left end of the first communication pipe 21 and a left end of the second communication pipe 22 are respectively connected to each corresponding actuator 1; the two actuating elements 1 are respectively controlled by a first oil pump 19 and a second oil pump 20, so that power can be provided for different structures at the same time, the switching valves 23 are respectively installed in the middle parts of the first communicating pipe 21 and the second communicating pipe 22, and the switching valves 23 are respectively installed in the middle parts of the first communicating pipe 21 and the second communicating pipe 22; the switch valve 23 is used for controlling different hydraulic pipelines, so that the starting and stopping of different actuating elements 1 are conveniently controlled, the practicability is improved, the first oil pump 19 is communicated with the second oil pump 20, the first oil pump 19 is connected with the motor 24, and the motor 24 is electrically connected with the control panel 16; the control panel 16 controls the on-off of the motor 24, so as to control the on-off of the first oil pump 19 and the second oil pump 20 conveniently, and when the internal pressure of the oil tank 5 is too high, the control panel 16 controls the motor 24 to be closed, so as to reduce the situation of the excessive internal pressure of the oil tank 5.
Further, an inflation valve 6 is arranged at the top end of the oil tank 5, the inflation valve 6 is provided with an inflation inlet, the inflation inlet is communicated with a first air duct 7, the first air duct 7 is communicated with a two-position three-way electromagnetic valve 8, the two-position three-way electromagnetic valve 8 is provided with a P port, an R port and an S port, the P port is communicated with the first air duct 7, the S port is communicated with a second air duct 9, the other end of the second air duct 9 is communicated with a pressure pump 10, the air inlet end of the pressure pump 10 is communicated with a third air duct 11, the left end of the third air duct 11 is communicated with a gas storage tank 12, inert gas is arranged inside the gas storage tank 12, and the inert gas; the krypton gas storage tank is low in cost and further reduces manufacturing cost, the upper portion of the gas storage tank 12 is communicated with a fourth gas guide pipe 13, the other end of the fourth gas guide pipe 13 is communicated with a gas suction pump 14, a gas inlet end and an R port of the gas suction pump 14 are communicated through a fifth gas guide pipe 28, the upper portion of the oil tank 5 is provided with a first pressure sensor 15, the right end of the oil tank 5 is provided with a control panel 16, the first pressure sensor 15, the two-position three-way electromagnetic valve 8, the gas suction pump 14 and the pressure pump 10 are all electrically connected with the control panel 16, the top end of the oil tank 5 is provided with a liquid level sensor 17, the middle portion of the inflation valve 6 is provided with a control; after a liquid level signal is sensed by the liquid level sensor 17, the liquid level signal is transmitted to the control panel 16, the control panel 16 transmits a signal to the control electromagnetic valve 18, the control electromagnetic valve 18 is closed, the inflation valve 6 is further blocked, the situation that oil enters the inflation valve 6 is reduced, the second pressure sensor 25 is installed on the inner wall of the air storage box 12, the controller 26 is installed at the bottom of the left end of the air storage box 12, the alarm 27 is installed at the top end of the air storage box 12, and the alarm 27 is electrically connected with the controller 26; the gas storage tank 12 is used for storing gas, and when the pressure in the gas storage tank 12 is too high and too low, the alarm 27 is used for giving an alarm, so that a user can be reminded conveniently; the control panel 16 controls the first pressure sensor 15, the two-position three-way electromagnetic valve 8, the air suction pump 14 and the pressure pump 10, the pressure value is transmitted through the first pressure sensor 15, after the pressure value exceeds a certain pressure value, the control panel 16 triggers the two-position three-way electromagnetic valve 8 to enable the port P and the port R to be communicated, and partial inert gas is transmitted into the gas storage tank 12 through the air suction pump 14, the traditional open type oil tank 5 is changed into a closed type oil tank 5, an air exchanger which is exchanged with air in a traditional hydraulic system is eliminated, the inside of the oil tank 5 is isolated from the external environment, the charging valve 6 is arranged, the inert gas with certain pressure is charged into the oil tank 5 through the charging valve 6, so that the external air, moisture and impurities cannot enter the oil tank 5, the hydraulic oil cannot be polluted by the outside, the fault rate is reduced, the service life of the hydraulic oil is greatly prolonged, and the charged inert gas has certain pressure, make the pressure of 5 inside of oil tanks can be higher than external pressure, make power unit's installation not influenced by the mounted position, high-pressure inert gas can be impressed hydraulic oil the oil absorption mouth of hydraulic pump, makes the oil absorption more smooth and easy, reduces the condition that the oil absorption is not enough, and hydraulic system efficiency can improve greatly, and the component life among the hydraulic system also can improve greatly.
The working process is as follows: the control panel 16 controls the first pressure sensor 15, the two-position three-way solenoid valve 8, the air suction pump 14 and the pressure pump 10, the pressure value is transmitted through the first pressure sensor 15, after the first pressure sensor 15 exceeds a certain pressure value, the control panel 16 triggers the two-position three-way solenoid valve 8 to enable the port P and the port R to be communicated, and part of inert gas is transmitted to the inside of the air storage box 12 through the air suction pump 14.
The actuator 1 comprises a cylinder system, a motor system and the like, which are conventional components combined by a common hydraulic system and the actuator.
The control panel is JZ-20, the first oil pump is S-50, the second oil pump is S-125, the first pressure sensor is SIN-P300, the second pressure sensor is SIN-P300, the booster pump is CM5-4, the suction pump is T0103242, and the controller is JZ-9, which are conventional commercially available components and are well known by those skilled in the art, and thus are not described again.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A hydraulic system comprising an actuator (1), characterized in that: still include oil pump (2), oil pump (2) left end intercommunication has communicating pipe (3), the left end of communicating pipe (3) with executive component (1) intercommunication, the right part of oil pump (2) all communicates has defeated oil pipe (4), the top intercommunication of defeated oil pipe (4) has oil tank (5), oil tank (5) are airtight container, the top of oil tank (5) is provided with inflation valve (6), inflation valve (6) are provided with the inflation inlet, inflation inlet intercommunication has first air duct (7), first air duct (7) intercommunication has two-position three-way solenoid valve (8), two-position three-way solenoid valve (8) are provided with P mouth, R mouth and S mouth, P mouth and first air duct (7) intercommunication, S mouth intercommunication has second air duct (9), the other end intercommunication of second air duct (9) has force (10), the utility model discloses a pressure pump, including air tank (5), air inlet end, air storage tank (12), air receiver, air inlet end intercommunication of force (10) has third air duct (11), the left end intercommunication of third air duct (11) has air storage tank (12), the inside of air storage tank (12) is provided with inert gas, the upper portion intercommunication of air storage tank (12) has fourth air duct (13), the other end intercommunication of fourth air duct (13) has aspirator pump (14), the air inlet end and the R mouth of aspirator pump (14) pass through fifth air duct (28) intercommunication, first pressure sensor (15) are installed on the upper portion of oil tank (5), control panel (16) are installed to the right-hand member of oil tank (5), first pressure sensor (15), two-position.
2. A hydraulic system according to claim 1, wherein: liquid level sensor (17) are installed on the top of oil tank (5), the mid-mounting of inflation valve (6) has control solenoid valve (18), control solenoid valve (18) with control panel (16) electricity is connected.
3. A hydraulic system according to claim 2, wherein: oil pump (2) include first oil pump (19) and second oil pump (20), the left end intercommunication of first oil pump (19) has first communicating pipe (21), the left end intercommunication of second oil pump (20) has second communicating pipe (22), executive component (1) is provided with two, the left end of first communicating pipe (21) and the left end of second communicating pipe (22) respectively with each correspond executive component (1) intercommunication.
4. A hydraulic system according to claim 3, wherein: and switch valves (23) are arranged in the middle parts of the first communicating pipe (21) and the second communicating pipe (22).
5. A hydraulic system according to claim 4, wherein: first oil pump (19) and second oil pump (20) intercommunication, first oil pump (19) are connected with motor (24), motor (24) with control panel (16) electricity is connected.
6. A hydraulic system according to claim 4, wherein: second pressure sensor (25) are installed to the inner wall of gas storage box (12), controller (26) are installed to the left end bottom of gas storage box (12), alarm (27) are installed on the top of gas storage box (12), alarm (27) with controller (26) electricity is connected.
7. A hydraulic system according to claim 4, wherein: the inert gas is krypton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011614668.7A CN112594241B (en) | 2020-12-30 | 2020-12-30 | Hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011614668.7A CN112594241B (en) | 2020-12-30 | 2020-12-30 | Hydraulic system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112594241A true CN112594241A (en) | 2021-04-02 |
| CN112594241B CN112594241B (en) | 2024-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011614668.7A Active CN112594241B (en) | 2020-12-30 | 2020-12-30 | Hydraulic system |
Country Status (1)
| Country | Link |
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| CN (1) | CN112594241B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046280A (en) * | 2021-11-12 | 2022-02-15 | 无锡非莱液压科技有限公司 | Hydraulic system with lubricating structure and process |
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| CN207808396U (en) * | 2017-10-23 | 2018-09-04 | 天津蓝科机械有限公司 | A kind of novel oil temperature machine |
| CN208439801U (en) * | 2018-06-12 | 2019-01-29 | 博世力健环保科技（益阳）有限公司 | The Mobile garbage compression box hydraulic system of integrated power source |
| CN110284998A (en) * | 2019-07-24 | 2019-09-27 | 马俊奇 | A kind of oil saver for gasoline engine system |
| CN111137462A (en) * | 2019-12-30 | 2020-05-12 | 航天时代飞鸿技术有限公司 | Large-scale freight unmanned aerial vehicle fuel system and control method thereof |
| CN211398089U (en) * | 2019-12-28 | 2020-09-01 | 无锡华控赛思节能技术有限公司 | Energy-saving pressure-maintaining type hydraulic station |
| CN214837443U (en) * | 2020-12-30 | 2021-11-23 | 顺平县犇创机电设备制造有限责任公司 | Hydraulic system |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4990061A (en) * | 1987-11-03 | 1991-02-05 | Fowler Elton D | Fluid controlled gas lift pump |
| US5361594A (en) * | 1991-03-11 | 1994-11-08 | Young Robert E | Refrigeration recovery and purification |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046280A (en) * | 2021-11-12 | 2022-02-15 | 无锡非莱液压科技有限公司 | Hydraulic system with lubricating structure and process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112594241B (en) | 2024-06-18 |
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