CN114278771A - Area-variable direct-acting overflow valve - Google Patents
Area-variable direct-acting overflow valve Download PDFInfo
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- CN114278771A CN114278771A CN202010807539.3A CN202010807539A CN114278771A CN 114278771 A CN114278771 A CN 114278771A CN 202010807539 A CN202010807539 A CN 202010807539A CN 114278771 A CN114278771 A CN 114278771A
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Abstract
The invention discloses a variable-area direct-acting overflow valve which comprises a valve body and a valve core coaxially arranged in the valve body, wherein an oil hole I and an oil hole II are respectively formed in the valve body in the axial direction and the radial direction, the oil hole I is communicated with the oil hole II, an annular valve seat is arranged at the tail end of the valve core, the valve seat and the valve body are coaxially communicated, the valve core is in clearance fit with the valve body, the valve seat is in clearance fit with the valve body, the diameter of the large excircle of the valve seat is larger than the diameter of the excircle of the valve core, a spring is connected to the tail end face of the valve seat, the other end of the spring is connected to a screw plug, the screw plug consists of an annular screw rod and a nut, the screw rod is arranged in the valve body, and the spring is fixed in a central cavity formed by the annular screw rod. The valve has the characteristics of simple structure, good manufacturability of processing and assembly test, and capability of obtaining ideal opening and closing rate. The valve can be widely used in a multi-way valve of engineering machinery and plays a role in overload protection.
Description
Technical Field
The invention relates to the technical field of overflow valves, in particular to a variable-area direct-acting overflow valve.
Background
Compared with a pilot operated overflow valve, the direct-operated overflow valve has many advantages of simple structure, sensitive reaction, strong pollution resistance and the like (the structure is shown in fig. 1), but the conventional direct-operated overflow valve also has a common problem that the opening and closing rate is low when the flow is large, and the working requirements of some hydraulic systems cannot be met, so that the direct-operated overflow valve with a novel structure needs to be developed, the specific advantages of the direct-operated overflow valve are maintained, the opening and closing characteristics are high, and the direct-operated overflow valve has a very wide application value to the hydraulic systems of many engineering machines.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the variable-area direct-acting overflow valve overcomes the defects in the prior art, is high in opening and closing rate, and can effectively improve the working efficiency of a hydraulic system.
The technical scheme adopted by the invention for solving the technical problems is as follows: the variable-area direct-acting overflow valve comprises a valve body and a valve core coaxially arranged in the valve body, wherein an oil hole I and an oil hole II are respectively formed in the valve body in the axial direction and the radial direction, the oil hole I is communicated with the oil hole II, an annular valve seat is installed at the tail end of the valve core, the valve seat and the valve body are coaxially communicated, the valve core is in clearance fit with the valve body, the valve seat is in clearance fit with the valve body, the diameter of the large excircle of the valve seat is larger than the diameter of the excircle of the valve core, a spring is connected to the tail end face of the valve seat, the other end of the spring is connected to the screw plug, the screw plug is composed of an annular screw rod and a nut, the screw rod is arranged in the valve body, and the spring is fixed in a central cavity formed by the annular screw rod.
Furthermore, the plug screw and valve body threaded connection, set up the external screw thread on the screw rod, set up the internal thread with external screw thread matched with in the valve body.
Furthermore, an O-shaped ring is arranged at the joint of the plug screw and the valve body.
Furthermore, an O-shaped ring or a check ring is arranged in a groove on the outer wall of the valve body.
Furthermore, the bottom of the central cavity of the screw rod is fixedly connected with a plurality of adjusting gaskets, and the spring is connected to the adjusting gaskets.
Furthermore, the fit clearance between the valve core and the valve body is set to be 0.1-0.2 mm.
Further, the fit clearance between the valve seat and the valve body is set to be 0.02-0.1 mm.
Further, the diameter of the large excircle of the valve seat is set to be 3-6 mm.
The area-variable direct-acting overflow valve has the beneficial effects that: 1. by adding the valve seat, the effective acting area of the valve core is increased when the overflow valve is completely opened, and the problems of low opening rate and low closing rate of the direct-acting overflow valve in large flow are well solved; 2. the structure is simple, the manufacturability of processing and assembling test is good, and the valve can be widely used in a multi-way valve of engineering machinery and plays a role in overload protection.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of a conventional direct relief valve;
FIG. 2 is a schematic structural view of the present invention;
in the figure, 1, a valve body, 2, a retainer ring, 3, a valve core, 4, a valve seat, 5, a spring, 6, an adjusting gasket, 7, a screw plug, 8, an O-shaped ring, 9, a steel ball seat, P, an oil hole I and T, an oil hole II are arranged.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The area-variable direct-acting overflow valve shown in fig. 2 comprises a valve body 1, a valve core 3 coaxially arranged in the valve body 1, oil holes IP and II T are respectively formed in the valve body 1 in the axial direction and the radial direction, the oil holes IP are communicated with the oil holes II T, an annular valve seat 4 is installed at the tail end of the valve core 3, the valve seat 4 and the valve body 1 are coaxially communicated, the valve core 3 is in clearance fit with the valve body 1, the valve seat 4 is in clearance fit with the valve body 1, the diameter of the large excircle of the valve seat 4 is larger than that of the valve core 3, a spring 5 is connected to the tail end face of the valve seat 4, the other end of the spring 5 is connected to a plug screw 7, the plug 7 is composed of an annular screw rod and a nut, the screw rod is arranged in the valve body 1, and the spring 5 is fixed in a central cavity formed by the annular screw rod.
The plug screw 7 and the valve body 1 are in threaded connection, an external thread is arranged on the screw rod, and an internal thread matched with the external thread is arranged in the valve body 1.
An O-shaped ring 8 is arranged at the joint of the screw plug 7 and the valve body 1.
An O-shaped ring 8 or a retainer ring 2 is arranged in a groove on the outer wall of the valve body 1.
The bottom of the central cavity of the screw is fixedly connected with a plurality of adjusting gaskets 6, and the spring 5 is connected on the adjusting gaskets 6.
The fit clearance between the valve core 3 and the valve body 1 is set to be 0.1-0.2 mm.
The fit clearance between the valve seat 4 and the valve body 1 is set to be 0.02-0.1 mm.
The diameter of the large excircle of the valve seat 4 is set to be 3-6 mm.
Compared with the conventional direct-acting relief valve shown in fig. 1, the direct-acting relief valve of the invention has the advantages that the valve seat is added at the tail part of the valve core, the effective acting areas S1 of the valve core and the valve body are the same when the valve core and the valve body are opened, the effective acting area of the valve core shown in fig. 1 is assumed to be S3, and the clearance between the steel ball seat and the valve body is generally not less than 0.2mm, obviously, the area of S2 is larger than S3. The effective acting area S2 is not the large excircle area of the valve seat, and changes with three parameters of the excircle size and thickness of the valve seat and the size of the fit clearance with the valve body, so the smaller the fit clearance between the valve seat and the valve body, the larger the excircle diameter and the thickness of the valve seat, the larger the S2 is, and the higher the opening and closing rate of the corresponding overflow valve is. The basic principle is that the magnitude of the opening pressure P1 depends only on the spring force N on the premise that S1 is unchanged, and assuming that the full opening pressure P2 is unchanged, the larger the full opening effective acting area S2 is, the larger the spring force N2 × P2 needs to be overcome is, and the larger the spring force N is, the larger the opening pressure P1 is N/S1 is, the higher the opening rate is, and the higher the closing rate is. In practical application, the three parameters can be properly adjusted according to the size of the structural size of the overflow valve, the pressure of a hydraulic system and the flow rate so as to obtain the required opening and closing rate.
The valve has the characteristics of simple structure, good manufacturability of processing and assembly test, and capability of obtaining ideal opening and closing rate. The valve can be widely used in a multi-way valve of engineering machinery and plays a role in overload protection.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. A variable-area direct-acting overflow valve is characterized in that: comprises a valve body (1) and a valve core (3) coaxially arranged in the valve body (1), wherein the valve body (1) is respectively provided with an oil hole I (P) and an oil hole II (T) in the axial direction and the radial direction, the oil hole I (P) is communicated with the oil hole II (T), the tail end of the valve core (3) is provided with an annular valve seat (4), the valve core (3), the valve seat (4) and the valve body (1) are coaxially communicated, the valve core (3) is in clearance fit with the valve body (1), the valve seat (4) is in clearance fit with the valve body (1), the diameter of the large excircle of the valve seat (4) is larger than that of the valve core (3), the tail end face of the valve seat (4) is connected with a spring (5), the other end of the spring (5) is connected with a screw plug (7), the screw plug (7) consists of an annular screw rod and a nut, the screw rod is arranged in the valve body (1), and a spring (5) is fixed in a central cavity formed by the annular screw rod.
2. The variable area direct-acting overflow valve of claim 1, wherein: the screw plug (7) is in threaded connection with the valve body (1), an external thread is arranged on the screw rod, and an internal thread matched with the external thread is arranged in the valve body (1).
3. The variable area direct-acting overflow valve of claim 1, wherein: and an O-shaped ring (8) is arranged at the joint of the screw plug (7) and the valve body (1).
4. The variable area direct-acting overflow valve of claim 1, wherein: an O-shaped ring (8) or a check ring (2) is arranged in a groove on the outer wall of the valve body (1).
5. The variable area direct-acting overflow valve of claim 1, wherein: the bottom of the central cavity of the screw rod is fixedly connected with a plurality of adjusting gaskets (6), and the spring (5) is connected to the adjusting gaskets (6).
6. The variable area direct-acting overflow valve of claim 1, wherein: the fit clearance between the valve core (3) and the valve body (1) is set to be 0.1-0.2 mm.
7. The variable area direct-acting overflow valve of claim 1, wherein: the valve seat (4) and the valve body (1) are matched with each other in a clearance of 0.02-0.1 mm.
8. The variable area direct-acting overflow valve of claim 1, wherein: the diameter of the large excircle of the valve seat (4) is set to be 3-6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010807539.3A CN114278771A (en) | 2020-09-28 | 2020-09-28 | Area-variable direct-acting overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010807539.3A CN114278771A (en) | 2020-09-28 | 2020-09-28 | Area-variable direct-acting overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114278771A true CN114278771A (en) | 2022-04-05 |
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ID=80867373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010807539.3A Pending CN114278771A (en) | 2020-09-28 | 2020-09-28 | Area-variable direct-acting overflow valve |
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| Country | Link |
|---|---|
| CN (1) | CN114278771A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06159546A (en) * | 1992-11-24 | 1994-06-07 | Uchida Yuatsu Kiki Kogyo Kk | Reverse characteristic type electromagnetic proportional relief valve and composite type relief valve |
| JP2001153103A (en) * | 1999-11-29 | 2001-06-08 | Hitachi Constr Mach Co Ltd | Relief valve |
| CN1563764A (en) * | 2004-04-16 | 2005-01-12 | 华中科技大学 | Middle high pressure directly-acting hydraulic overflow valve |
| CN102042432A (en) * | 2010-12-10 | 2011-05-04 | 北京工业大学 | Direct-acting water pressure overflow valve with damping piston |
| CN102235393A (en) * | 2011-08-15 | 2011-11-09 | 宁波广天赛克思液压有限公司 | Buffer relief valve for hydraulic motor |
| CN102678987A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | Seawater hydraulic overflow valve |
| CN104019258A (en) * | 2014-06-26 | 2014-09-03 | 华中科技大学无锡研究院 | Double-damping direct-acting type hydraulic pressure overflowing valve |
| CN105782526A (en) * | 2016-05-25 | 2016-07-20 | 李志聪 | Water pressure overflow valve |
| JP2017187134A (en) * | 2016-04-07 | 2017-10-12 | 株式会社山田製作所 | Relief valve |
-
2020
- 2020-09-28 CN CN202010807539.3A patent/CN114278771A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06159546A (en) * | 1992-11-24 | 1994-06-07 | Uchida Yuatsu Kiki Kogyo Kk | Reverse characteristic type electromagnetic proportional relief valve and composite type relief valve |
| JP2001153103A (en) * | 1999-11-29 | 2001-06-08 | Hitachi Constr Mach Co Ltd | Relief valve |
| CN1563764A (en) * | 2004-04-16 | 2005-01-12 | 华中科技大学 | Middle high pressure directly-acting hydraulic overflow valve |
| CN102042432A (en) * | 2010-12-10 | 2011-05-04 | 北京工业大学 | Direct-acting water pressure overflow valve with damping piston |
| CN102235393A (en) * | 2011-08-15 | 2011-11-09 | 宁波广天赛克思液压有限公司 | Buffer relief valve for hydraulic motor |
| CN102678987A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | Seawater hydraulic overflow valve |
| CN104019258A (en) * | 2014-06-26 | 2014-09-03 | 华中科技大学无锡研究院 | Double-damping direct-acting type hydraulic pressure overflowing valve |
| JP2017187134A (en) * | 2016-04-07 | 2017-10-12 | 株式会社山田製作所 | Relief valve |
| CN105782526A (en) * | 2016-05-25 | 2016-07-20 | 李志聪 | Water pressure overflow valve |
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