CN107975508B - Damping valve - Google Patents
Damping valve Download PDFInfo
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- CN107975508B CN107975508B CN201711193595.7A CN201711193595A CN107975508B CN 107975508 B CN107975508 B CN 107975508B CN 201711193595 A CN201711193595 A CN 201711193595A CN 107975508 B CN107975508 B CN 107975508B
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- valve
- valve core
- valve body
- threaded sleeve
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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
- F15B13/026—Pressure compensating valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Damping Devices (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a damping valve which comprises a valve body, a valve core, a spring and a threaded sleeve, wherein an A port is formed in the lower part of the valve body, a B port is formed in the upper part of the threaded sleeve, and the threaded sleeve is fixedly connected with the valve body through threads; the valve core and the spring are arranged in the inner cavity of the threaded sleeve, the upper end of the spring is abutted against the step of the inner cavity of the threaded sleeve, the lower end of the spring is abutted against the valve core, the lower end of the valve core keeps the trend of extending into the port A, and the lower end of the valve core is in clearance fit with the port A of the valve body; when oil flows from the port A to the port B, the lower end of the valve core gradually moves upwards to reduce the length matched with the port A of the valve body in a clearance way, and the oil at the port A flows into the port B through a clearance between the valve core and the port A of the valve body; when oil flows into the port A from the port B, the lower end of the valve core extends into the port A, and the oil flows into the port A from the port B through a gap between the valve core and the port A of the valve body. The damping valve is simple to process and can effectively buffer the sensitive pressure fluctuation of the load.
Description
Technical Field
The invention relates to the technical field of control valve manufacturing, in particular to a damping valve, and particularly relates to a damping valve used in a load sensitive system of engineering machinery such as a wheel loader, a crane and a mini excavator.
Background
The quantitative load sensing system is widely applied to engineering machinery such as loaders, automobile cranes, mini-excavators and the like due to energy conservation and low cost. The load-sensitive multi-way reversing valve is a core element of the load-sensitive system, the quantitative load-sensitive system needs to realize the flow distribution of the execution element according to the requirement, and the two-way pressure compensation valve is an essential element of the hydraulic control system. In practical application conditions, because the load pressure fluctuates constantly, the opening degree of the feedback valve core is suddenly changed, and further the jitter of the actuating element is caused
The existing patent number 200910052739.6 is named as a pressure compensation valve, which comprises a valve body, a valve core and a shuttle valve, wherein the valve body is provided with an oil inlet hole, an oil outlet hole, an oil return hole and a control hole, the bottom inlet of the oil inlet hole and the bottom inlet of the oil outlet hole are arranged in a non-coaxial manner, and the bottom inlet of the oil inlet hole is positioned on the right side of the bottom inlet of the oil outlet hole. The shuttle valve is fixedly arranged at the left end of the valve body, the two load cavities of the valve body are respectively communicated with the two oil inlets of the shuttle valve, and the main valve hole of the valve body is communicated with the oil outlet of the shuttle valve. The valve core is arranged in the valve body and is connected with the shuttle valve through a spring. The first damper is additionally arranged in the load pressure feedback cavity to buffer load sensitive pressure fluctuation, but the damping is too simple, so that the buffering of the load pressure fluctuation is not ideal, and the structure of the damper needs to be further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a damping valve which is reasonable and compact in structure and can effectively buffer the load sensitive pressure fluctuation in the current state of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the damping valve comprises a valve body, a valve core, a spring and a threaded sleeve, wherein an A port is formed in the lower part of the valve body, and an inner cavity communicated with the A port is formed in the valve body; the upper part of the threaded sleeve is provided with a port B, a stepped inner cavity communicated with the port B is arranged in the threaded sleeve, and the threaded sleeve is fixedly connected with the valve body through threads; the valve core and the spring are arranged in the inner cavity of the threaded sleeve, the upper end of the spring is abutted against the step of the inner cavity of the valve sleeve, the lower end of the spring is abutted against the valve core, the lower end of the valve core keeps the trend of extending into the opening A, the lower end of the valve core is sequentially provided with a first cylinder, a conical surface and a second cylinder from top to bottom, the first cylinder is in clearance fit with the opening A of the valve body, the middle part of the valve core is provided with an annular retainer ring, and the lower section of the annular retainer ring is provided with; when oil flows from the port A to the port B, the lower end of the valve core gradually moves upwards to reduce the length matched with the port A of the valve body in a clearance way, and the oil at the port A flows into the port B through a clearance between the valve core and the port A of the valve body; when oil flows into the port A from the port B, the lower end of the valve core extends into the port A, and the oil flows into the port A from the port B through a gap between the valve core and the port A of the valve body.
Preferably, a sealing ring is arranged in the middle of the periphery of the valve body.
The invention has the following beneficial effects:
according to the invention, through the clearance fit between the valve core and the port A, when oil flows from the port A to the port B, the lower end of the valve core can gradually move upwards according to the pressure difference between the port A and the port B to reduce the length of the clearance fit with the port A of the valve body, because the clearance fit distance is shortened, the damping is gradually reduced, and the oil at the port A flows into the port B from the clearance between the valve core and the port A of the valve body; when oil flows into the port A from the port B, the lower end of the valve core extends into the port A, the clearance fit distance is long, the damping is large, and the oil flows into the port A from the port B through a clearance between the valve core and the port A of the valve body. Therefore, the oil can flow into the port A from the port B to have large damping, and flow into the port B from the port A to automatically adjust the damping according to the pressure difference of the oil and the port B, so that the load sensitive pressure fluctuation is effectively buffered, the response speed is not influenced, and the structure is compact.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic structural view of one embodiment of a damping valve according to the present invention;
FIG. 2 is a schematic structural diagram of a valve core of the damping valve of the present invention;
FIG. 3 is a schematic diagram of the damper valve of the present invention;
FIG. 4 is a schematic diagram of a hydraulic circuit employing the damping valve of the present invention;
fig. 5 is a diagram showing the effect of the pressure buffering according to the present invention.
In the figure: 1. the valve comprises a threaded sleeve, 2, a spring, 3, a valve body, 4, a valve core, 41, a first cylinder, 42, a conical surface, 43, a second cylinder, 44, an annular retainer ring, 441 and a through flow groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all 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.
As shown in fig. 1, a specific embodiment of the damping valve of the present invention is shown. In the embodiment, the damping valve mainly comprises a valve body 3, a valve core 4, a spring 2 and a threaded sleeve 1, wherein an opening A is formed in the lower part of the valve body 3, and an inner cavity communicated with the opening A is formed in the valve body 3. The upper part of the screw sleeve 1 is provided with a port B, a stepped inner cavity communicated with the port B is arranged inside the screw sleeve 1, and the screw sleeve 1 is fixedly connected with the valve body 3 through threads; the valve core 4 and the spring 2 are arranged in the inner cavity of the threaded sleeve 1, the upper end of the spring 2 is abutted to the step of the inner cavity of the threaded sleeve 1, the lower end of the spring 2 is abutted to the valve core 4, the lower end of the valve core 4 keeps the trend of extending into the port A, and the lower end of the valve core 4 is in clearance fit with the port A of the valve body 3. When oil flows from the port A to the port B, the lower end of the valve core 4 gradually moves upwards to reduce the length matched with the port A of the valve body 3 in a clearance way, and the oil at the port A flows into the port B through a clearance between the lower end of the valve core 4 and the port A of the valve body; when oil flows into the port A from the port B, the lower end of the valve core 4 extends into the port A, and the oil flows into the port A from the port B through a gap between the valve core 4 and the port A of the valve body.
In a preferred embodiment, as shown in fig. 2, the lower end of the valve core 4 is sequentially provided with a first cylinder 41, a conical surface 42 and a second cylinder 43 from top to bottom, the first cylinder 41 is in clearance fit with the opening a of the valve body 3, the middle part of the valve core 4 is provided with an annular retaining ring 44, and the lower section of the annular retaining ring 44 is provided with a through flow groove 441. When the pressure difference between the port A and the port B is large, the conical surface 42 and the second cylinder 43 are arranged at the lower end of the valve core 4, the first cylinder 41 gradually extends out of the port A, the damping effect is gradually reduced, the flow area through the conical surface 42 and the second cylinder 43 is larger, and quick response can be realized. The through flow groove 441 is arranged, so that when oil flows into the port A from the port B, the annular retainer ring 44 cannot block the port A, and flow control is not affected.
In one embodiment, as shown in fig. 1, a sealing ring is arranged in the middle of the periphery of the valve body 3 to reliably seal the port a and the port B, and oil can only enter and exit the port a and the port B through the valve core 4.
Fig. 3 shows a schematic diagram of the damping valve according to the invention. As can be seen from fig. 1, 2 and 3, when the oil flows from the port a to the port B, the lower end of the valve element 4 gradually moves upward, the length of the gap fit between the first cylinder 41 and the port a of the valve body 3 is reduced, the oil at the port a flows into the port B through the gap between the first cylinder 41 of the valve element 4 and the port a of the valve body, and the larger the pressure difference between the port a and the port B, the longer the distance that the first cylinder 41 moves upward, and the smaller the damping of the fit gap between the first cylinder 41 and the port a. When oil flows into the port A from the port B, the first cylinder 41 completely extends into the port A, the oil flows into the port A from the port B through a gap between the valve core 4 and the port A of the valve body, and at this time, the damping of the gap between the first cylinder 41 and the port A is maximum.
The working principle is as follows:
as shown in FIG. 4, the damping control valve is applied to a quantitative load sensing system, load sensing pressure fluctuation is buffered by matching a hydraulic pump 5, a throttle valve 6 and a two-way pressure compensator 7, an A port of the damping valve is connected with a load sensing cavity of the two-way pressure compensator 7, and a B port of the damping valve is connected with an outlet of the throttle valve and is connected with load pressure.
When the pressure at the port B fluctuates, as shown in FIG. 5, the solid line represents the pressure at the port B, the dotted line represents the pressure at the port A, and the pressure fluctuation value at the port B has continuous wave crests and wave troughs; when the pressure fluctuation of the port B reaches the trough, the pressure difference between the port A and the port B is small, the pressure of the port A pushes against the valve core 4, the first cylinder 41 completely extends into the port A, the gap damping of the first cylinder 41 and the port A is maximum, and therefore the pressure reduction of the port A can be delayed. Therefore, when the pressure of the port B fluctuates, the pressure value of the port A is stabilized between the wave crest and the wave trough of the pressure fluctuation of the port B, the valve port of the two-way pressure compensator 7 is also in a stable state, and the valve port cannot be ignored, so that the vibration cannot be generated.
When the load reduction value of the quantitative load sensing system is large, and the pressure of the port B fluctuates to a wave trough to enable the pressure difference between the port A and the port B to be large, the pressure of the port A acts on the valve core 4 to overcome the acting force of the spring 2 to push the valve core 4 to move upwards so as to reduce the length of the clearance fit between the first cylinder 41 and the port A and reduce the damping effect; when the two-way pressure compensator 7 needs to be fully opened, the pressure difference between the port A and the port B is large, the valve core 4 is directly pushed upwards to the upper end of the conical surface 42 exposed out of the port A, and quick backflow is realized, so that the two-way pressure compensator 7 can be quickly closed.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It is also to be understood that the features of the various embodiments may be combined with each other so long as no structural conflict exists, and the resulting combined features are within the scope of the present invention. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (2)
1. A damping valve comprises a valve body, a valve core, a spring and a threaded sleeve, and is characterized in that an opening A is formed in the lower portion of the valve body, and an inner cavity communicated with the opening A is formed in the valve body; the upper part of the threaded sleeve is provided with a port B, a stepped inner cavity communicated with the port B is arranged in the threaded sleeve, and the threaded sleeve is fixedly connected with the valve body through threads; the valve core and the spring are arranged in the inner cavity of the threaded sleeve, the upper end of the spring is abutted against the step of the inner cavity of the threaded sleeve, the lower end of the spring is abutted against the valve core, the lower end of the valve core keeps the trend of extending into the opening A, the lower end of the valve core is sequentially provided with a first cylinder, a conical surface and a second cylinder from top to bottom, the first cylinder is in clearance fit with the opening A of the valve body, the middle part of the valve core is provided with an annular retainer ring, and the lower section of the annular retainer ring is provided with a through groove; when oil flows from the port A to the port B, the lower end of the valve core gradually moves upwards to reduce the length matched with the port A of the valve body in a clearance mode, the oil at the port A flows into the port B through a clearance between the valve core and the port A of the valve body, the larger the pressure difference between the port A and the port B is, the longer the distance of the upward movement of the first cylinder is, and the smaller the damping of the matching clearance between the first cylinder and the port A is; when oil flows into the port A from the port B, the lower end of the valve core extends into the port A, the oil flows into the port A from the port B through a gap between the valve core and the port A of the valve body, and the damping of a fit gap between the first cylinder and the port A is maximum.
2. The damper valve according to claim 1, wherein a seal ring is provided at a middle portion of the valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711193595.7A CN107975508B (en) | 2017-11-24 | 2017-11-24 | Damping valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711193595.7A CN107975508B (en) | 2017-11-24 | 2017-11-24 | Damping valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107975508A CN107975508A (en) | 2018-05-01 |
| CN107975508B true CN107975508B (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711193595.7A Active CN107975508B (en) | 2017-11-24 | 2017-11-24 | Damping valve |
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| CN (1) | CN107975508B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111140619A (en) * | 2020-01-03 | 2020-05-12 | 北京强度环境研究所 | Damping valve of hydraulic shock absorber and hydraulic shock absorber |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2876358Y (en) * | 2005-11-28 | 2007-03-07 | 潍柴动力股份有限公司 | Oil outlet valve used on diesel oil engine oil spray pump |
| CN202991314U (en) * | 2012-12-04 | 2013-06-12 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Split type damping fuel outlet valve |
| CN204942128U (en) * | 2015-06-25 | 2016-01-06 | 徐州重型机械有限公司 | A kind of bidirectional damper valve arrangement |
| CN107061402A (en) * | 2017-05-26 | 2017-08-18 | 湖南凯恩利液压机械制造有限公司 | A kind of hydraulic control load holding valve, hydraulic system and plant equipment |
-
2017
- 2017-11-24 CN CN201711193595.7A patent/CN107975508B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2876358Y (en) * | 2005-11-28 | 2007-03-07 | 潍柴动力股份有限公司 | Oil outlet valve used on diesel oil engine oil spray pump |
| CN202991314U (en) * | 2012-12-04 | 2013-06-12 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Split type damping fuel outlet valve |
| CN204942128U (en) * | 2015-06-25 | 2016-01-06 | 徐州重型机械有限公司 | A kind of bidirectional damper valve arrangement |
| CN107061402A (en) * | 2017-05-26 | 2017-08-18 | 湖南凯恩利液压机械制造有限公司 | A kind of hydraulic control load holding valve, hydraulic system and plant equipment |
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| CN107975508A (en) | 2018-05-01 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20200521 Address after: Room C38-202, No. 5, Xijing Road, Ouhai Economic Development Zone, Wenzhou City, Zhejiang Province, 325000 Applicant after: WENZHOU HANXUANLIN INDUSTRIAL DESIGN Co.,Ltd. Address before: 315000 Zhejiang province Ningbo city Ningbo high tech Zone Juxian Road No. 555 building 035 room 18-1 No. 013 station Applicant before: NINGBO WENZE ELECTROMECHANICAL TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20201225 Address after: 224400 Sanzao Industrial Park 99 (E), Funing County, Yancheng City, Jiangsu Province Patentee after: Jiangsu Zhongni Machinery Technology Co.,Ltd. Address before: Room c38-202, No.5 Xijing 1st Road, Ouhai Economic Development Zone, Wenzhou, Zhejiang 325000 Patentee before: WENZHOU HANXUANLIN INDUSTRIAL DESIGN Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Damping valve Effective date of registration: 20210827 Granted publication date: 20200612 Pledgee: Bank of Jiangsu Co.,Ltd. Yancheng branch Pledgor: Jiangsu Zhongni Machinery Technology Co.,Ltd. Registration number: Y2021980008505 |
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