CN112128171A - Metal-sealed automatic exhaust pipe of hydraulic circuit of circuit breaker - Google Patents
Metal-sealed automatic exhaust pipe of hydraulic circuit of circuit breaker Download PDFInfo
- Publication number
- CN112128171A CN112128171A CN202010801599.4A CN202010801599A CN112128171A CN 112128171 A CN112128171 A CN 112128171A CN 202010801599 A CN202010801599 A CN 202010801599A CN 112128171 A CN112128171 A CN 112128171A
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- Prior art keywords
- circuit breaker
- metal
- valve block
- low
- exhaust pipe
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Classifications
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- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
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- 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
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- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
Abstract
The invention discloses a metal sealed automatic exhaust pipe of a hydraulic circuit of a circuit breaker, which is characterized by being positioned on a pressure monitoring module of a hydraulic mechanism of the circuit breaker and comprising a valve body positioned on the pressure monitoring module, wherein an exhaust bolt is arranged on the valve body; the low-pressure oil pipe is connected to one end of the valve block and is arranged downwards from the low-pressure oil pipe, and the flow guide pipeline is communicated with the oil pump through a pipeline. The invention has the advantages of simple structure, no need of external power supply and power failure of the circuit breaker, automatic exhaust when the circuit breaker is electrified, high exhaust efficiency and reliable exhaust effect.
Description
Technical Field
The invention belongs to the technical field of hydraulic systems of circuit breakers of electrical equipment, and particularly relates to a metal-sealed automatic exhaust pipe of a hydraulic circuit of a circuit breaker.
Background
In the energy storage process of the circuit breaker mechanism, a small amount of nitrogen possibly exists in an energy storage nitrogen cylinder and can overflow into hydraulic oil, so that a certain amount of gas is collected on the low-pressure oil side of a pump head of a hydraulic oil pump, if the gas accumulated by the pump head cannot be discharged in time, the oil pump cannot be pressurized to a rated pressure, and the motor is directly pressurized to be overtime or frequently started. The existing technical scheme for solving the defect is to loosen an air release bolt on a low-pressure oil pipe manually and release air on the low-pressure oil side until hydraulic oil flows out. The existing method belongs to fault post-processing, a motor loop of an oil pump is locked under the action of a pressurizing overtime loop, and the oil pump cannot effectively supplement pressure after a switch hydraulic loop is normally infiltrated, so that the pressure is gradually reduced to reclosing locking pressure, and the switching defect is discovered only when the reclosing locking loop sends a signal. Not only consume a large amount of manpower and material resources, but also the switch can not be normally switched on and off in this period, and the safe and stable operation of the power grid is threatened.
For example, chinese patent document CN 2014205445079 discloses a "hydraulic oil degassing device for electric circuit breaker hydraulic mechanism" on 11/3/2015, which discloses a hydraulic oil degassing device for electric circuit breaker hydraulic mechanism, comprising a heating part, a stirring part, an exhaust part and an electrical control part, wherein: the heating part consists of a metal container A (2) and a heater (3) fixed on the outer circumferential surface; the stirring part comprises a metal container B (5), a stirrer (6) and a motor (7), the metal container B (5) is fixed on a base (9), the stirrer (6) is arranged in the metal container B (5) and connected with the motor (7), and the motor (7) is connected with the electric control part; the exhaust part comprises a metal base A (11), a transparent plastic pipe (12) and a metal base B (14), wherein the transparent plastic pipe (12) is fixed between the metal base A (11) and the metal base B (14). The following disadvantages exist: the structure is complicated, the exhaust is completed by an external motor, the energy consumption is high, and the working efficiency is low.
Disclosure of Invention
Based on the problems, the invention provides the metal sealing type automatic exhaust pipe for the hydraulic circuit of the circuit breaker, which is particularly suitable for exhausting accumulated gas of the pump head in the horizontal direction, has a simple structure, does not need an external power supply or power failure of the circuit breaker, can automatically exhaust gas when the circuit breaker is electrified, and has high exhaust efficiency and reliable exhaust effect; the gas in the low-pressure oil circuit of the circuit breaker hydraulic system is automatically discharged, the normal pressure of the circuit breaker oil pump can be effectively guaranteed, and the phenomena of frequent pressure and low-pressure locking are eliminated.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a metal sealed automatic exhaust pipe of a hydraulic circuit of a circuit breaker is characterized by being positioned on a pressure monitoring module of a hydraulic mechanism of the circuit breaker and comprising a valve body positioned on the pressure monitoring module, wherein an exhaust bolt is arranged on the valve body, an exhaust hole is formed in the exhaust bolt, the valve body comprises a valve block and a sliding body valve core capable of rotating relative to the valve block, the valve block is provided with a low-pressure oil pipe, the low-pressure oil pipe is connected with an oil pump, a flow guide pipeline is arranged in the sliding body valve core, a flow guide ring cavity is arranged between the outer side of the sliding body valve core and the valve block, a plurality of communicating holes for communicating the flow guide ring cavity with the flow guide pipeline are formed; the low-pressure oil pipe is connected to one end of the valve block and is arranged downwards from the low-pressure oil pipe, and the flow guide pipeline is communicated with the oil pump through a pipeline.
The slide valve core can rotate, after gas and oil in a low-pressure loop enter a flow guide pipeline and a flow guide ring cavity, the density of the gas is low, the density of the oil is high, according to the specific gravity principle, the buoyancy force applied to an object is equal to the weight of liquid (or gas) discharged by the object, the buoyancy force applied to the slide valve core changes, the gas in the flow guide ring cavity rises and the oil sinks, the slide valve core is pushed by the oil and can rotate around an axis, the communication between a communication hole and a through hole in a seal sleeve is realized, and the gas discharge is completed; after the gas is discharged, hydraulic oil in the oil pump flows into the guide ring cavity through the low-pressure oil pipe, the hydraulic oil flows into the guide pipeline along the shortest path and can generate unidirectional rotating force on the sliding body valve core, so that the communication hole and the sealing sleeve are dislocated again, the sealing sleeve is abutted to the bottom of the guide ring cavity for sealing, the exhaust path is cut off, the oil is prevented from overflowing, the structure is simple, an external power supply is not needed, the energy consumption is reduced, and the control power supply voltage fluctuation caused by external load is reduced; the automatic exhaust is carried out according to the pressure of the accumulated gas, the exhaust efficiency is high, and the exhaust effect is reliable.
Preferably, the low-pressure oil pipe is a copper pipe. The service life is long, and compared with a plastic pipe or a rubber pipe, the defects of oil leakage and the like caused by aging are avoided; and the rigid shape is conveniently manufactured, the position of the valve block can be kept to be connected with the highest point of the low-pressure oil pipe, and the reliability of gas accumulation is ensured.
Preferably, two communication holes are provided symmetrically on the side surface of the slider body spool. The structural stability of slider case is guaranteed in the symmetry setting, and when one of them of two intercommunicating pores corresponds the completion exhaust with the exhaust hole, another can accomplish the oil feed to it is steady to realize the hydraulic pressure in the water conservancy diversion passageway, prevents to fluctuate.
Preferably, the sealing sleeve is made of rubber materials, and the inner diameter of the sealing sleeve is larger than that of the communication hole. The sealing sleeve is matched with the communicating hole, preferably made of wear-resistant materials, the sealing sleeve can be guaranteed to be in butt sealing with the bottom surface of the flow guide ring cavity, and the sealing sleeve can be prevented from being stuck in the communicating hole due to the fact that the inner diameter of the sealing sleeve is large, and the sliding reliability of the sealing sleeve on the bottom surface of the flow guide ring cavity is guaranteed.
Preferably, the valve block is provided with a mounting hole corresponding to the exhaust bolt and an oil inlet hole corresponding to the low-pressure oil pipe, the axis of the mounting hole and the axis of the oil inlet hole are vertically intersected with the axis of the valve block, and the mounting hole and the oil inlet hole are arranged at an obtuse angle. The axis of the mounting hole is arranged obliquely upwards from outside to inside, so that gas can be conveniently gathered in the valve block and the flow guide channel, and the exhaust is facilitated.
Preferably, sealing grooves are respectively formed in the outer side of the sliding body valve core and on the two sides of the guide ring cavity, and sealing rings are arranged in the sealing grooves; the inner side wall of the valve block is in interference fit with the sealing ring. The rotary sealing between the sliding body valve core and the valve block is completed, and oil leakage is prevented.
Preferably, the inner side of the valve block is provided with a ring groove corresponding to the guide ring cavity. The space of the guide ring cavity is enlarged through the ring groove, so that more oil or gas can be contained in the guide ring cavity, the influence of the proportion principle on the sliding table valve core is improved, and the rotary exhaust reliability of the sliding table valve core is ensured.
Preferably, a sealing surface is arranged in the sealing sleeve, the sealing surface is of a two-half structure, and the two half sealing surfaces are attached to seal the axial section of the sealing sleeve; the sealing surface is made of wear-resistant elastic material. The sealing performance of the sealing sleeve is improved through the sealing surface, the sealing performance is reliable when the sealing sleeve is abutted against the flow guide ring cavity, after gas is accumulated in the flow guide channel, when the sealing sleeve is opposite to the communication hole, the sealing surface is squeezed open by gas pressure, the sealing surface is elastically deformed, gas discharge is completed, the gas can be discharged only when the gas has certain pressure, the reliability of gas discharge of the exhaust hole is improved, and low-pressure oil is prevented from overflowing from the exhaust hole.
Preferably, the sliding body valve core is rotatably connected with a rotary seat, and the rotary seat is provided with an external thread for being in threaded connection with the pressure control module. The installation and connection of the sliding body valve core are facilitated, the rotation capacity of the sliding body valve core is guaranteed, and the sliding body valve core can rotate conveniently and exhaust automatically.
Preferably, a spiral groove is formed in the annular groove and is arranged along the axis of the valve block. The function of making the torrent deceleration that is different from traditional helicla flute, the helicla flute of this department except making the torrent, reduces the velocity of flow of hydraulic oil, hydraulic oil velocity of flow itself in this application is slower, and hydraulic oil in the water conservancy diversion ring cavity mainly flows outside the helicla flute, and is big to the viscous force of slider case, makes things convenient for the slider case to rotate, guarantees the rotation effect to the slider case, and simultaneously, the kinetic energy through reducing hydraulic oil also reduces the pressure of hydraulic oil and improves the ability of preventing overflowing from the exhaust vent of hydraulic oil.
In conclusion, the beneficial effects of the invention are as follows: the structure is simple, an external power supply is not needed, the power failure of the circuit breaker is not needed, the air can be automatically exhausted when the circuit breaker is electrified, the air exhaust efficiency is high, and the air exhaust effect is reliable; the gas in the low-pressure oil circuit of the circuit breaker hydraulic system is automatically discharged, the normal pressure of the circuit breaker oil pump can be effectively guaranteed, and the phenomena of frequent pressure and low-pressure locking are eliminated.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a sectional view of the inside of the valve body in the present invention.
Fig. 3 is a schematic view of the structure of the valve block of the present invention.
Fig. 4 is a cross-sectional view of the valve block in the radial direction in the present invention.
Fig. 5 is a schematic view of the structure of the slider valve element according to the present invention.
Fig. 6 is a front view of the low pressure oil pipe of the present invention.
FIG. 7 is a top view of the low pressure oil line of the present invention.
Fig. 8 is a sectional view in the axial direction of the valve block through the exhaust bolt in the present invention.
Wherein: the pressure monitoring module 1 has a valve block 2 mounting hole 21, an oil inlet hole 22, a ring groove 23, a spiral groove 231, an exhaust bolt 24, a sealing sleeve 241, a sealing surface 242, an exhaust hole 25, a sliding body valve core 3, a communication hole 31, a flow guide ring cavity 33, a sealing ring 35, a rotary seat 36, an oil pump 4 and a low-pressure oil pipe 5 air guide section 51 direction adjusting section 52.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
Example (b):
as shown in fig. 1 to 8, the metal-sealed automatic exhaust pipe for the hydraulic circuit of the circuit breaker is characterized in that the metal-sealed automatic exhaust pipe is arranged on a pressure monitoring module 1 of a hydraulic mechanism of the circuit breaker, and comprises a valve body arranged on the pressure monitoring module 1, an exhaust bolt 24 is arranged on the valve body, an exhaust hole 25 is arranged in the exhaust bolt 24, the valve body comprises a valve block 2 and a sliding valve core 3 which can rotate relative to the valve block 2, the sliding valve core 3 is rotatably connected with a rotary base 36, and an external thread which is in threaded connection with the pressure control module is arranged on the rotary base 36. The valve block 2 is provided with a low-pressure oil pipe 5, the valve block 2 is provided with a mounting hole 21 corresponding to an exhaust bolt 24 and an oil inlet 22 corresponding to the low-pressure oil pipe 5, the axis of the mounting hole 21 and the axis of the oil inlet 22 are perpendicular to the axis of the valve block 2, and the mounting hole 21 and the oil inlet 22 are arranged at an obtuse angle. The exhaust bolt 24 is screwed into the mounting hole 21. The low pressure oil pipe 5 is connected with an oil pump 4, and one end of the low pressure oil pipe 5 is connected above the oil pump 4. A flow guide pipeline 32 is arranged in the sliding valve core 3, and the flow guide pipeline 32 is communicated with the oil pump 4 through a pipeline.
A guide ring cavity 33 is arranged between the outer side of the sliding body valve core 3 and the valve block 2, sealing grooves 34 are respectively arranged on the two sides of the guide ring cavity 33 on the outer side of the sliding body valve core 3, and sealing rings 35 are arranged in the sealing grooves 34; the inner side wall of the valve block 2 is in interference fit with the sealing ring 35. The seal groove 34 is an annular groove. The inner side of the valve block 2 is provided with a ring groove 23 corresponding to the guide ring cavity 33. The annular groove 23 is provided with a spiral groove 231 arranged along the axis of the valve block 2. The sliding body valve core 3 is provided with two communicating holes 31 for communicating the guide ring cavity 33 and the guide pipeline 32, and the communicating holes 31 are symmetrically arranged on the side surface of the sliding body valve core 3. The exhaust hole 25 is provided with a sealing sleeve 241 which can be attached to the bottom surface of the guide ring cavity 33; the sealing sleeve 241 is made of a rubber material, and the inner diameter of the sealing sleeve 241 is larger than that of the communication hole 31. A sealing surface 242 is arranged in the sealing sleeve 241, the sealing surface 242 is located at the lower end of the sealing sleeve 241, and the sealing surface 242 is attached to the bottom surface of the flow guide ring cavity 33. The sealing surface 242 is of a two-half structure, and the two half sealing surfaces 242 are attached to the axial section of the sealing sleeve 241; the sealing surface 242 is made of a wear-resistant elastic material. Such as a wear-resistant silica gel material. The abutting surfaces of the two halves of the closing surface 242 are perpendicular to the axis of the valve block 2.
The low-pressure oil pipe 5 adopts a copper pipe. The low pressure oil pipe 5 is connected at one end of the valve block 2 and is arranged downwards from the low pressure oil pipe 5, the low pressure oil pipe 5 comprises an air guide section 51 which is arranged downwards along the axis of the oil inlet 22 and a three-section direction adjusting section 52 which is bent continuously, the air guide section 51 prevents air from flowing back into the low pressure oil pipe 5, the direction adjusting section 52 realizes the direction integration of the low pressure oil pipe 5, the installation of the low pressure oil pipe 5 is facilitated, and the bending part of the air guide section 52 and the direction adjusting section 52 is provided with fillet transition. Two ends of the low-pressure oil pipe 5 are respectively connected with the valve block 2 and the oil pump 4 through pipe joints.
The sliding body valve core 3 can rotate, after gas and oil in a low-pressure loop enter the flow guide pipeline 32 and the flow guide ring cavity 33, because the gas has low density and the oil has high density, according to the specific gravity principle, the buoyancy force applied to an object is equal to the weight of liquid (or gas) discharged by the object, the buoyancy force applied to the sliding body valve core 3 changes, the gas in the flow guide ring cavity 33 rises and the oil sinks, the sliding body valve core 3 can rotate around the axis under the pushing of the oil, the communication between the communication hole 31 and the through hole in the sealing sleeve 241 is realized, and the gas discharge is completed; after the gas is discharged, hydraulic oil in the oil pump 4 flows into the guide ring cavity 33 through the low-pressure oil pipe 5, the hydraulic oil flows into the guide pipeline 32 along the shortest path and can generate unidirectional rotating force on the sliding body valve core 3, so that the communication hole 31 and the sealing sleeve 241 are dislocated again, the sealing sleeve 241 is abutted to the bottom of the guide ring cavity 33 for sealing, the exhaust path is cut off, the oil is prevented from overflowing, the structure is simple, an external power supply is not needed, the energy consumption is reduced, and the control power supply voltage fluctuation caused by the external load is reduced; the automatic exhaust is carried out according to the pressure of the accumulated gas, the exhaust efficiency is high, and the exhaust effect is reliable. The invention can automatically discharge the gas in the low-pressure oil circuit of the hydraulic system of the circuit breaker, effectively ensure the normal pressure of the oil pump 4 of the circuit breaker and eliminate the phenomena of frequent pressure and low-pressure locking.
It will be appreciated by those of ordinary skill in the art that the examples described herein are intended to assist the reader in understanding the manner in which the invention is practiced, and it is to be understood that the scope of the invention is not limited to such specifically recited statements and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (10)
1. A metal sealed automatic exhaust pipe of a hydraulic circuit of a circuit breaker is characterized by being positioned on a pressure monitoring module of a hydraulic mechanism of the circuit breaker and comprising a valve body positioned on the pressure monitoring module, wherein an exhaust bolt is arranged on the valve body, an exhaust hole is formed in the exhaust bolt, the valve body comprises a valve block and a sliding body valve core capable of rotating relative to the valve block, the valve block is provided with a low-pressure oil pipe, the low-pressure oil pipe is connected with an oil pump, a flow guide pipeline is arranged in the sliding body valve core, a flow guide ring cavity is arranged between the outer side of the sliding body valve core and the valve block, a plurality of communicating holes for communicating the flow guide ring cavity with the flow guide pipeline are formed; the low-pressure oil pipe is connected to one end of the valve block and is arranged downwards from the low-pressure oil pipe, and the flow guide pipeline is communicated with the oil pump through a pipeline.
2. The metal-sealed automatic exhaust pipe of the hydraulic circuit of the circuit breaker according to claim 1, wherein the low-pressure oil pipe is a copper pipe.
3. The metal-sealed automatic exhaust pipe for the hydraulic circuit of the circuit breaker according to claim 1, wherein the communication holes are symmetrically provided in two on the side of the spool of the slider.
4. The metal-sealed automatic exhaust pipe of the hydraulic circuit of the circuit breaker as recited in claim 1, wherein the sealing sleeve is made of rubber material, and the inner diameter of the sealing sleeve is larger than the diameter of the communication hole.
5. The metal-sealed automatic exhaust pipe for the hydraulic circuit of the circuit breaker as claimed in claim 1, wherein the valve block is provided with a mounting hole corresponding to the exhaust bolt and an oil inlet hole corresponding to the low-pressure oil pipe, the axes of the mounting hole and the oil inlet hole are perpendicular to the axis of the valve block, and the mounting hole and the oil inlet hole are arranged at an obtuse angle.
6. The metal-sealed automatic exhaust pipe of the hydraulic circuit of the circuit breaker according to claim 1, wherein seal grooves are respectively formed on the outer sides of the sliding body valve core on two sides of the guide ring cavity, and seal rings are arranged in the seal grooves; the inner side wall of the valve block is in interference fit with the sealing ring.
7. The metal-sealed automatic exhaust pipe of the hydraulic circuit of the circuit breaker as claimed in claim 1 or 5, wherein the valve block is provided with a ring groove corresponding to the guide ring cavity on the inner side.
8. The metal-sealed automatic exhaust pipe of the hydraulic circuit of the circuit breaker as claimed in claim 1 or 4, wherein the sealing sleeve is internally provided with a sealing surface which is of a two-half structure, and the two half sealing surfaces are attached to the shaft section of the rear sealing sleeve; the sealing surface is made of wear-resistant elastic material.
9. The metal-sealed automatic exhaust pipe of the hydraulic circuit of the circuit breaker as claimed in claim 1, wherein the sliding valve core is rotatably connected with a rotary base, and the rotary base is provided with external threads for being in threaded connection with the pressure control module.
10. The metal-sealed automatic exhaust pipe for a hydraulic circuit of a circuit breaker according to claim 7, wherein the annular groove is provided with a spiral groove along an axis of the valve block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801599.4A CN112128171B (en) | 2020-08-11 | 2020-08-11 | Metal-sealed automatic exhaust pipe of hydraulic circuit of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801599.4A CN112128171B (en) | 2020-08-11 | 2020-08-11 | Metal-sealed automatic exhaust pipe of hydraulic circuit of circuit breaker |
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| Publication Number | Publication Date |
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| CN112128171A true CN112128171A (en) | 2020-12-25 |
| CN112128171B CN112128171B (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010801599.4A Active CN112128171B (en) | 2020-08-11 | 2020-08-11 | Metal-sealed automatic exhaust pipe of hydraulic circuit of circuit breaker |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204828691U (en) * | 2015-06-30 | 2015-12-02 | 河南平高电气股份有限公司 | Air bleeding valve and hydraulic system for hydraulic system |
| JP2017082656A (en) * | 2015-10-27 | 2017-05-18 | 株式会社オティックス | Vacuum pump oil discharging structure at cam housing |
| CN208286877U (en) * | 2017-09-01 | 2018-12-28 | 宁波锦宇电器有限公司 | A kind of releasing pressure automatically exhaust valve |
| CN209309445U (en) * | 2018-12-26 | 2019-08-27 | 天津海之凰环境科技有限公司 | A kind of exhaust pipe drain valve |
| CN213144907U (en) * | 2020-08-11 | 2021-05-07 | 国网浙江省电力有限公司嘉兴供电公司 | Automatic exhaust pipe of hydraulic circuit of circuit breaker |
-
2020
- 2020-08-11 CN CN202010801599.4A patent/CN112128171B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204828691U (en) * | 2015-06-30 | 2015-12-02 | 河南平高电气股份有限公司 | Air bleeding valve and hydraulic system for hydraulic system |
| JP2017082656A (en) * | 2015-10-27 | 2017-05-18 | 株式会社オティックス | Vacuum pump oil discharging structure at cam housing |
| CN208286877U (en) * | 2017-09-01 | 2018-12-28 | 宁波锦宇电器有限公司 | A kind of releasing pressure automatically exhaust valve |
| CN209309445U (en) * | 2018-12-26 | 2019-08-27 | 天津海之凰环境科技有限公司 | A kind of exhaust pipe drain valve |
| CN213144907U (en) * | 2020-08-11 | 2021-05-07 | 国网浙江省电力有限公司嘉兴供电公司 | Automatic exhaust pipe of hydraulic circuit of circuit breaker |
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| Publication number | Publication date |
|---|---|
| CN112128171B (en) | 2022-07-01 |
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