CN110792823A - Hydraulic overcurrent protection device and method - Google Patents
Hydraulic overcurrent protection device and method Download PDFInfo
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- CN110792823A CN110792823A CN201910965705.XA CN201910965705A CN110792823A CN 110792823 A CN110792823 A CN 110792823A CN 201910965705 A CN201910965705 A CN 201910965705A CN 110792823 A CN110792823 A CN 110792823A
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- hydraulic
- valve
- overcurrent protection
- spring
- hydraulic oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention belongs to the field of overcurrent protection of aircrafts, and discloses a hydraulic overcurrent protection device and a hydraulic overcurrent protection method, wherein the hydraulic overcurrent protection device comprises: the valve comprises a valve shell, a spring, a valve, a pin and a spring seat; one end of the valve shell is connected with an external main hydraulic combination valve through threads, and a spring, a valve, a pin and a spring seat are sequentially arranged in the valve shell from left to right; one end of the valve is contacted with the spring, and the other end of the valve is contacted with the spring seat; the spring seat is fixed on the valve shell by the pin; the lower end face of the valve shell is sequentially provided with a hydraulic oil outlet, a first hydraulic oil inlet and a second hydraulic oil inlet from left to right; the annular groove is formed in the middle of the valve and used for communicating the first hydraulic oil inlet and the hydraulic oil outlet, when the flow passing through the APU overcurrent protection device exceeds a certain value, the hydraulic overcurrent protection device can automatically break a passage, and an emergency hydraulic system can be guaranteed to provide certain working flow for the flight control system.
Description
Technical Field
The invention belongs to the field of overcurrent protection of aircrafts, and particularly relates to a hydraulic overcurrent protection device and method.
Background
In an aircraft APU starting hydraulic system, the flow passing through an APU overcurrent protection device can reach a very high value in a short time, and equipment damage is easily caused.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, in order to ensure that the emergency hydraulic system provides a certain working flow to the flight control system and effectively prevent the rotating speed of the starting motor of the APU from exceeding the limit, the invention arranges an over-current protection device in a pressure supply oil path of the emergency hydraulic system to the pressure accumulator of the APU.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the first technical scheme is as follows:
a hydraulic overcurrent protection device, the device comprising: the valve comprises a valve shell, a spring, a valve, a pin and a spring seat;
one end of the valve shell is connected with an external main hydraulic combination valve through threads, and a spring, a valve, a pin and a spring seat are sequentially arranged in the valve shell from left to right;
one end of the valve is in contact with the spring, and the other end of the valve is in contact with the spring seat;
the spring seat is fixed on the valve shell by the pin;
the lower end face of the valve shell is sequentially provided with a hydraulic oil outlet, a first hydraulic oil inlet and a second hydraulic oil inlet from left to right;
and an annular groove is formed in the middle of the valve and used for communicating the first hydraulic oil inlet with the hydraulic oil outlet.
The first technical scheme of the invention has the characteristics and further improvements that:
(1) the device also comprises an adjusting gasket, wherein the adjusting gasket is arranged at one end of the spring, which is contacted with the valve shell.
(2) And a convex shoulder is arranged on the shell between the hydraulic oil outlet and the first hydraulic oil inlet.
The second technical scheme is as follows:
the hydraulic overcurrent protection method is applied to the protection device according to the first technical scheme, under the normal state, the valve is pressed on the positioning seat under the action of the spring, the first hydraulic oil inlet is communicated with the hydraulic oil outlet through the annular groove in the middle of the valve, and the hydraulic overcurrent protection device is in an open state.
The second technical scheme of the invention has the characteristics and further improvements that:
(1) the normal state is normal temperature, the inlet flow is 3.8L/min, and the flow resistance is less than or equal to 0.15 MPa.
(2) The valve is subjected to leftward hydraulic pressure increase along with the increase of the flow of the first hydraulic oil inlet and the second hydraulic oil inlet;
when the inlet flow reaches a preset value, the valve moves leftwards against the force of the spring under the action of hydraulic pressure, the spherical surface of the valve presses the convex shoulder of the valve shell to form sealing between the spherical surface and the convex shoulder, an oil supply passage of the first hydraulic oil inlet is cut off, and the hydraulic overcurrent protection device is in a closed state.
(3) The preset value is 5-6L/min.
(4) When the inlet pressure is reduced to the preset value, the valve is reset under the action of the spring, so that the hydraulic overcurrent protection device is in an open state.
The invention has the beneficial effects that: the hydraulic overcurrent protection device is commonly used in an aircraft APU starting hydraulic system, when the flow passing through the APU overcurrent protection device exceeds a certain value, the hydraulic overcurrent protection device can automatically disconnect a passage, the emergency hydraulic system can be ensured to provide certain working flow for a flight control system, the rotating speed of an APU starting motor is effectively prevented from exceeding the limit, when the inlet pressure is reduced to the certain value, the passage is reopened, and the safety of the system is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a hydraulic overcurrent protection apparatus according to an embodiment of the present invention;
wherein, 1 is a valve shell, 2 is a spring, 3 is a valve, 4 is a pin, 5 is a spring seat, 6 is a ring groove, and 7 is a convex shoulder.
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.
The invention relates to a hydraulic overcurrent protection device for an aircraft, which can lead the pressure difference between an inlet and an outlet to change along with the flow change of an APU overcurrent protection device by means of the throttling function between the inlet and the outlet.
The invention relates to a hydraulic overcurrent protection device for an aircraft, which mainly comprises a valve shell 1, a spring 2, a valve 3, a pin 4 and a spring seat 5. One end of the valve 3 is in contact with the spring 2, one end of the other end of the valve is in contact with the spring seat 5, the annular groove 6 is formed in the middle of the valve 3, when the hydraulic overcurrent protection device does not work, the first inlet and the outlet of the hydraulic overcurrent protection device are communicated through the annular groove 6 under the action of spring force, and meanwhile, the second inlet is communicated with the right end of the hydraulic overcurrent protection device.
The working principle is as follows:
under normal state, the valve 3 is pressed on the spring seat 5 under the action of the spring 2, so that the first inlet oil path and the outlet oil path are communicated, and the hydraulic overflow protection device is in an open state. When the flow passing through the first inlet and the second inlet of the product reaches a certain value, the valve 3 moves leftwards under the action of the hydraulic pressure, overcomes the force of the spring 2, the spherical surface of the valve 3 presses on the shoulder 7 of the valve shell to form the sealing of the spherical surface and the shoulder 7, the oil supply passage of the first inlet is cut off, and the hydraulic overflow protection device is closed; when the pressure of the second inlet is reduced to a certain value, the valve 3 is reset under the action of the spring 2, so that the hydraulic overcurrent protection device is in an open state.
The hydraulic overcurrent protection device is commonly used in an aircraft APU starting hydraulic system, when the flow passing through the APU overcurrent protection device exceeds a certain value, the hydraulic overcurrent protection device can automatically disconnect a passage, the emergency hydraulic system can be ensured to provide certain working flow for a flight control system, the rotating speed of an APU starting motor is effectively prevented from exceeding the limit, when the inlet pressure is reduced to the certain value, the passage is reopened, and the safety of the system is greatly improved.
The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A hydraulic overcurrent protection device, comprising: the valve comprises a valve shell, a spring, a valve, a pin and a spring seat;
one end of the valve shell is connected with an external main hydraulic combination valve through threads, and a spring, a valve, a pin and a spring seat are sequentially arranged in the valve shell from left to right;
one end of the valve is in contact with the spring, and the other end of the valve is in contact with the spring seat;
the spring seat is fixed on the valve shell by the pin;
the lower end face of the valve shell is sequentially provided with a hydraulic oil outlet, a first hydraulic oil inlet and a second hydraulic oil inlet from left to right;
and an annular groove is formed in the middle of the valve and used for communicating the first hydraulic oil inlet with the hydraulic oil outlet.
2. The hydraulic overcurrent protection device of claim 1 further comprising a spacer shim disposed at an end of the spring in contact with the shutter housing.
3. A hydraulic overflow protection device as claimed in claim 1 wherein the housing is provided with a shoulder at a location between the hydraulic oil outlet and the first hydraulic oil inlet.
4. A hydraulic overcurrent protection method as claimed in any one of claims 1 to 3, characterized in that, in the normal state, the valve is pressed against the positioning socket by the spring, the first hydraulic oil inlet and the hydraulic oil outlet are connected via an annular groove in the middle of the valve, and the hydraulic overcurrent protection device is in the open state.
5. The hydraulic overcurrent protection method as recited in claim 4, wherein the normal state is normal temperature, the inlet flow rate is 3.8L/min, and the flow resistance is less than or equal to 0.15 MPa.
6. The hydraulic overcurrent protection method according to claim 4,
the valve is subjected to leftward hydraulic pressure increase along with the increase of the flow of the first hydraulic oil inlet and the second hydraulic oil inlet;
when the inlet flow reaches a preset value, the valve moves leftwards against the force of the spring under the action of hydraulic pressure, the spherical surface of the valve presses the convex shoulder of the valve shell to form sealing between the spherical surface and the convex shoulder, an oil supply passage of the first hydraulic oil inlet is cut off, and the hydraulic overcurrent protection device is in a closed state.
7. The hydraulic overcurrent protection method as recited in claim 6, wherein the preset value is 5 to 6L/min.
8. A hydraulic over-current protection method according to claim 6, wherein when the inlet pressure is reduced to the preset value, the valve is reset under the action of the spring, so that the hydraulic over-current protection device is in an open state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910965705.XA CN110792823B (en) | 2019-10-11 | 2019-10-11 | Hydraulic overcurrent protection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910965705.XA CN110792823B (en) | 2019-10-11 | 2019-10-11 | Hydraulic overcurrent protection device and method |
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| Publication Number | Publication Date |
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| CN110792823A true CN110792823A (en) | 2020-02-14 |
| CN110792823B CN110792823B (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910965705.XA Active CN110792823B (en) | 2019-10-11 | 2019-10-11 | Hydraulic overcurrent protection device and method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08272455A (en) * | 1995-03-31 | 1996-10-18 | Nippon Spindle Mfg Co Ltd | Flow rate control valve |
| CN202579406U (en) * | 2012-05-17 | 2012-12-05 | 湖南鸿辉科技有限公司 | Hydraulic valve bank for unloading low-pressure pilot valve |
| CN203670933U (en) * | 2014-01-09 | 2014-06-25 | 马革 | Water inlet overpressure automatic stop valve for water storage barrel of water purifying equipment |
| CN207728759U (en) * | 2017-12-29 | 2018-08-14 | 科力远混合动力技术有限公司 | The hydraulic control system of clutch in gearbox |
| CN108533809A (en) * | 2018-06-21 | 2018-09-14 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Superpressure for underwater manned platform outboard cooling system automatically cuts off hull valve |
| CN108825818A (en) * | 2018-08-27 | 2018-11-16 | 东莞海特帕沃液压科技有限公司 | A kind of anti-slip control valve for off roader |
| CN109695754A (en) * | 2019-01-11 | 2019-04-30 | 西安理工大学 | A kind of hydraulic inlet valve |
-
2019
- 2019-10-11 CN CN201910965705.XA patent/CN110792823B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08272455A (en) * | 1995-03-31 | 1996-10-18 | Nippon Spindle Mfg Co Ltd | Flow rate control valve |
| CN202579406U (en) * | 2012-05-17 | 2012-12-05 | 湖南鸿辉科技有限公司 | Hydraulic valve bank for unloading low-pressure pilot valve |
| CN203670933U (en) * | 2014-01-09 | 2014-06-25 | 马革 | Water inlet overpressure automatic stop valve for water storage barrel of water purifying equipment |
| CN207728759U (en) * | 2017-12-29 | 2018-08-14 | 科力远混合动力技术有限公司 | The hydraulic control system of clutch in gearbox |
| CN108533809A (en) * | 2018-06-21 | 2018-09-14 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Superpressure for underwater manned platform outboard cooling system automatically cuts off hull valve |
| CN108825818A (en) * | 2018-08-27 | 2018-11-16 | 东莞海特帕沃液压科技有限公司 | A kind of anti-slip control valve for off roader |
| CN109695754A (en) * | 2019-01-11 | 2019-04-30 | 西安理工大学 | A kind of hydraulic inlet valve |
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| CN110792823B (en) | 2021-12-03 |
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