CN111456977A - High-pressure large-flow inverse proportion overflow valve - Google Patents
High-pressure large-flow inverse proportion overflow valve Download PDFInfo
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- CN111456977A CN111456977A CN202010272158.XA CN202010272158A CN111456977A CN 111456977 A CN111456977 A CN 111456977A CN 202010272158 A CN202010272158 A CN 202010272158A CN 111456977 A CN111456977 A CN 111456977A
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- valve core
- valve
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- sleeve
- pressure
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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
- F15B13/024—Pressure relief valves
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- Engineering & Computer Science (AREA)
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to an overflow valve, in particular to an overflow valve suitable for high pressure and large flow. The high-pressure large-flow inverse proportion overflow valve comprises a proportion electromagnet, the proportion electromagnet is connected with a valve sleeve through a mounting seat, a cone valve core and a cone valve sleeve are arranged in the valve sleeve, the cone valve sleeve is arranged at the rear end of the valve sleeve and the front end of the cone valve core, a push rod with proportion electromagnetic paste is arranged behind the cone valve core, the front part of the cone valve core is a valve core of the high-pressure large-flow inverse proportion overflow valve, a P port is arranged in front of the valve core, and the cone valve core slides back and; the port P is communicated with a large solution cavity formed by the rear part of the valve core and the front end of the cone valve sleeve through a primary throttling hole at the end part of the valve core, a secondary throttling hole communicated with the large solution cavity is arranged at the end part of the cone valve core, and a small solution cavity is arranged behind the secondary throttling hole; the end faces of the left end and the right end of the valve core are equal in area. The invention can realize inverse proportion adjustment, and the cone valve core has good stability and large flow.
Description
Technical Field
The invention relates to an overflow valve, in particular to an overflow valve suitable for high pressure and large flow.
Background
In a hydraulic system of a medium-sized or large-sized excavator, a matched breaking hammer needs to work under the conditions of large flow at 400L/min and highest pressure of 400bar, and the oil supply pressure is proportionally adjusted within the range of 400bar according to the construction condition, at present, the most advanced adjusting method is that an excavator driver sets a percentage current signal of a required pressure value in a cab through a liquid crystal touch screen, and the current signal controls a high-pressure large-flow inverse proportion overflow valve in the hydraulic system, so that the oil supply pressure of the breaking hammer is proportionally adjusted.
In consideration of the reliability of the whole excavator, an excavator manufacturer requires that when a touch screen fails or a circuit control system fails, an overflow valve can still work at the highest working pressure, the oil supply pressure is reduced along with the increase of a current signal, the overflow valve is required to be adopted for realizing the purpose, but the pressure and the current signal of the existing proportional overflow valve are in direct proportion, and the requirement of the excavator cannot be met.
CN200820182072.2 discloses an inverse proportion overflow valve, is equipped with the rubber pad between the inner wall of the outer wall of awl case and disk seat (16) centre bore, and the case time can lead to rubber pad fatigue fracture at axial motion to influence the stability of awl case, the easy impurity that gets into of the radial aperture of filter screen below is blockked up. Meanwhile, the flow and the pressure of the inverse proportion overflow valve are too small, and the market demand can not be met.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a high-pressure large-flow inverse proportion overflow valve. The invention can realize inverse proportion adjustment, and the cone valve core has good stability and large flow.
The purpose of the invention is realized as follows: the high-pressure large-flow inverse proportion overflow valve comprises a proportion electromagnet, the proportion electromagnet is connected with a valve sleeve through a mounting seat, a cone valve core and a cone valve sleeve are arranged in the valve sleeve, the cone valve sleeve is arranged at the rear end of the valve sleeve and the front end of the cone valve core, a push rod with proportion electromagnetic paste is arranged behind the cone valve core, the front part of the cone valve core is a valve core of the high-pressure large-flow inverse proportion overflow valve, a P port is arranged in front of the valve core, and the cone valve core slides back and; the port P is communicated with a large solution cavity formed by the rear part of the valve core and the front end of the cone valve sleeve through a primary throttling hole at the end part of the valve core, a secondary throttling hole communicated with the large solution cavity is arranged at the end part of the cone valve core, a small solution cavity is arranged behind the secondary throttling hole, and the areas of the end surfaces of the left end and the right end of the valve core are equal.
The valve core of the high-pressure large-flow inverse proportion overflow valve is provided with a filter near the end of the P port.
The high-pressure large-flow inverse proportion overflow valve is characterized in that the push rod is provided with a return spring.
The high-pressure large-flow inverse proportion overflow valve is characterized in that a valve core seal is arranged between the valve core and the valve sleeve.
The high-pressure large-flow inverse proportion overflow valve is characterized in that a seal is arranged between the valve sleeve and the mounting seat.
The high-pressure large-flow inverse proportion overflow valve is characterized in that a seal is arranged between the cone valve sleeve and the valve sleeve.
Hydraulic oil enters the cavity from the port P through the filter and the primary throttling hole, certain pressure is formed in the cavity, the hydraulic oil reaches the tip position of the cone valve core through the secondary throttling hole, the push rod of the proportional electromagnet is pressed against the cone valve core contacted with the proportional electromagnet leftwards under the action of the elastic force of the return spring, and the cone valve core is balanced under the action of the right hydraulic pressure and the left spring force of the push rod. The pressure in the large-capacity cavity is equal to the pressure of the port P, the cross sectional areas of the left end and the right end of the valve core are equal, so the hydraulic pressure is equal, the valve core is simultaneously pushed leftwards by the reset spring, so the valve core and the oil way P → R of the valve sleeve are closed, the proportional electromagnet is not electrified, when the pressure of the port P is increased, the hydraulic pressure borne by the conical valve core is greater than the pushing force of the reset spring, the valve core moves rightwards to start overflowing, namely the oil way at the right end of the secondary throttling hole is communicated, and the pressure; the valve core moves rightwards, the oil way P → R is opened until the pressures of the left end and the right end of the valve core are equal, the valve core stops moving, and at the moment, the overflow pressure of a port P is equal to the set force of a return spring; when the proportional electromagnet is electrified, the push rod moves rightwards under the action of the attraction force of the proportional electromagnet, the leftward thrust of the push rod on the cone valve core is reduced, and the pressure of the port P is reduced accordingly, so that the pressure of the port P is inversely proportional to the electromagnetic attraction force (control current) of the proportional electromagnet, and the function of inverse proportional overflow is achieved. The oil liquid in the small cavity flows out from the oil drainage hole through the internal oil way and is converged with the R port.
The cone valve core axially slides in the inner hole of the cone valve sleeve, the stability and the reliability of the cone valve core are high, the cone valve core is provided with a valve core seal, the leakage between the cone valve core and the valve sleeve is small, and the large flow is supported; the valve core is provided with the filter, so that the throttling hole can be prevented from being blocked by oil particles, and the pollution resistance is strong.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings, in which, 1 is a filter, 2 is a primary orifice, 3 is a valve sleeve, 4 is a valve core, 5 is a secondary orifice, 6 is a cone valve sleeve, 7 is a cone valve core, 8 is a mounting seat, 9 is a return spring, 10 is a push rod, 11 is a proportional electromagnet, 12 is an oil inlet, 13 is a return spring, 14 is a large volume, 15 is an oil drain hole, 16 is a small volume, 17 is a plug, and 18 is a valve core seal
As shown in fig. 1, the high-pressure large-flow inverse proportion overflow valve of the invention comprises a proportion electromagnet 11, which is connected with a valve sleeve 3 through a mounting seat 8, a cone valve core 7 and a cone valve sleeve 6 are arranged in the valve sleeve, the cone valve sleeve is arranged at the rear end of the valve sleeve and the front end of the cone valve core, a push rod 10 of proportion electromagnetic paste is arranged behind the cone valve core, a valve core 4 of the high-pressure large-flow inverse proportion overflow valve is arranged in front of the cone valve core, a port P is arranged in front of the valve core, and the cone valve core 7 slides back and forth in; the port P is communicated with a large solution cavity 14 formed by the rear part of the valve core and the front end of the cone valve sleeve through a primary throttling hole 2 at the end part of the valve core, a secondary throttling hole 5 communicated with the large solution cavity is arranged at the end part of the cone valve core, a small solution cavity 16 is arranged behind the secondary throttling hole, and the end areas of the left end and the right end of the valve core are equal.
The valve core of the high-pressure large-flow inverse proportion overflow valve is provided with a filter 1 near the end of the P port.
The push rod of the high-pressure large-flow inverse proportion overflow valve is provided with a return spring 13.
When the proportional electromagnet is electrified, the push rod moves rightwards under the action of the attraction force of the proportional electromagnet, the leftward thrust of the push rod on the cone valve core is reduced, and the pressure of the port P is reduced accordingly, so that the pressure of the port P is inversely proportional to the electromagnetic attraction force (control current) of the proportional electromagnet, and the function of inverse proportional overflow is achieved.
The high-pressure large-flow inverse proportion overflow valve is characterized in that a valve core seal 18 is arranged between the valve core and the valve sleeve.
The high-pressure large-flow inverse proportion overflow valve is characterized in that a seal is arranged between the valve sleeve and the mounting seat, and a seal is arranged between the valve core sleeve and the valve sleeve.
The foregoing is merely an example of the embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The high-pressure large-flow inverse proportion overflow valve comprises a proportion electromagnet, the proportion electromagnet is connected with a valve sleeve through a mounting seat, a cone valve core and a cone valve sleeve are arranged in the valve sleeve, the cone valve sleeve is arranged at the rear end of the valve sleeve and the front end of the cone valve core, a push rod attached with proportion electromagnetism is arranged behind the cone valve core, the front part of the cone valve core is a valve core of the high-pressure large-flow inverse proportion overflow valve, and a port P is arranged in front of the valve core; the port P is communicated with a large solution cavity formed by the rear part of the valve core and the front end of the cone valve sleeve through a primary throttling hole at the end part of the valve core, a secondary throttling hole communicated with the large solution cavity is arranged at the end part of the cone valve core, and a small solution cavity is arranged behind the secondary throttling hole; the end faces of the left end and the right end of the valve core are equal in area.
2. The high-pressure large-flow inverse proportion overflow valve according to claim 1, wherein a filter is arranged on the valve core close to the P port end.
3. The high-pressure large-flow inverse proportion overflow valve according to claim 1, wherein a return spring is arranged on the push rod.
4. The high-pressure large-flow inverse proportional relief valve according to claim 1, wherein a valve core seal is arranged between the valve core and the valve sleeve.
5. The high pressure high flow inverse proportional relief valve of claim 1, wherein a seal is provided between the valve housing and the mounting seat.
6. The high-pressure high-flow inverse proportional relief valve according to claim 1, wherein a seal is provided between the cone valve sleeve and the valve sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010272158.XA CN111456977A (en) | 2020-04-09 | 2020-04-09 | High-pressure large-flow inverse proportion overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010272158.XA CN111456977A (en) | 2020-04-09 | 2020-04-09 | High-pressure large-flow inverse proportion overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111456977A true CN111456977A (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010272158.XA Pending CN111456977A (en) | 2020-04-09 | 2020-04-09 | High-pressure large-flow inverse proportion overflow valve |
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| Country | Link |
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| CN (1) | CN111456977A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1619198A (en) * | 2004-04-21 | 2005-05-25 | 华中科技大学 | Leading type water pressure overflow valve |
| CN101124525A (en) * | 2005-02-11 | 2008-02-13 | Hydac流体技术有限公司 | Valve, especially proportional pressure control valve |
| CN203670808U (en) * | 2014-01-06 | 2014-06-25 | 常德中联重科液压有限公司 | Pilot-operated relief valve |
| CN203670326U (en) * | 2013-12-18 | 2014-06-25 | 常德中联重科液压有限公司 | Overflow valve with oil supplementation function |
| CN204140531U (en) * | 2014-08-28 | 2015-02-04 | 比亚迪股份有限公司 | Relief valve |
| CN105134681A (en) * | 2015-10-08 | 2015-12-09 | 杭州力龙液压有限公司 | One-way cushion overflow valve and closed-type hydraulic pump |
| CN108843645A (en) * | 2018-07-20 | 2018-11-20 | 佛山信卓派思机械科技有限公司 | A kind of balanced valve |
| CN110242632A (en) * | 2019-05-27 | 2019-09-17 | 龙工（上海）精工液压有限公司 | Main-control valve of excavating machine secondary relief with filter device |
-
2020
- 2020-04-09 CN CN202010272158.XA patent/CN111456977A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1619198A (en) * | 2004-04-21 | 2005-05-25 | 华中科技大学 | Leading type water pressure overflow valve |
| CN101124525A (en) * | 2005-02-11 | 2008-02-13 | Hydac流体技术有限公司 | Valve, especially proportional pressure control valve |
| CN203670326U (en) * | 2013-12-18 | 2014-06-25 | 常德中联重科液压有限公司 | Overflow valve with oil supplementation function |
| CN203670808U (en) * | 2014-01-06 | 2014-06-25 | 常德中联重科液压有限公司 | Pilot-operated relief valve |
| CN204140531U (en) * | 2014-08-28 | 2015-02-04 | 比亚迪股份有限公司 | Relief valve |
| CN105134681A (en) * | 2015-10-08 | 2015-12-09 | 杭州力龙液压有限公司 | One-way cushion overflow valve and closed-type hydraulic pump |
| CN108843645A (en) * | 2018-07-20 | 2018-11-20 | 佛山信卓派思机械科技有限公司 | A kind of balanced valve |
| CN110242632A (en) * | 2019-05-27 | 2019-09-17 | 龙工（上海）精工液压有限公司 | Main-control valve of excavating machine secondary relief with filter device |
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Application publication date: 20200728 |