CN108825835B - Direct-acting superposition type pressure reducing valve - Google Patents
Direct-acting superposition type pressure reducing valve Download PDFInfo
- Publication number
- CN108825835B CN108825835B CN201810819002.1A CN201810819002A CN108825835B CN 108825835 B CN108825835 B CN 108825835B CN 201810819002 A CN201810819002 A CN 201810819002A CN 108825835 B CN108825835 B CN 108825835B
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- Prior art keywords
- pressure regulating
- pressure
- connecting section
- plunger
- external thread
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- 230000001603 reducing effect Effects 0.000 title abstract description 32
- 230000001105 regulatory effect Effects 0.000 claims abstract description 150
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 8
- 238000003754 machining Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- 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
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention provides a direct-acting superposition type pressure reducing valve, which comprises: the valve comprises a valve body, a valve core assembled in an inner cavity of the valve body, a steel ball, a spring seat, a pressure regulating spring, a pressure regulating plunger and a pressure regulating screw which are assembled and connected in sequence from left to right from the right end of the valve core, and a front cover fixed at the front end of the valve body, wherein a first through hole is formed in the front cover and is used for installing the pressure regulating screw, a second through hole is formed in the front cover and is used for installing the pressure regulating plunger and the pressure regulating spring, the pressure regulating screw and the pressure regulating plunger are connected in a floating split manner, and the problem that pressure regulation cannot be carried out or difficulty in pressure regulation is caused by poor coaxiality is completely solved; in addition, through the cooperation use of the positive thread and the reverse thread, when the positive thread rotates anticlockwise to reduce pressure, the reverse thread part of the pressure regulating screw can not be screwed out, but the pressure regulating screw forcedly pulls the pressure regulating plunger to move rightwards, so that the pressure reduction is realized to the minimum value of the regulated pressure, and the structure reduces the requirement on the roughness of the inner hole of the front cover of the pressure reducing valve.
Description
Technical Field
The invention relates to the field of pressure reducing valves, in particular to a direct-acting superposition type pressure reducing valve and an assembly method thereof.
Background
The pressure reducing valve is mainly used for realizing the pressure regulating function and has the advantages of simple structure, small volume, wide application and the like. The working principle of the pressure regulating valve is that the pressure regulating plunger compresses the pressure regulating spring so as to push the valve core to move, so that the outlet of the pressure reducing valve is opened or reduced; on the premise of neglecting other resistance, the outlet pressure and the spring force acting on the valve core are balanced, so that the outlet pressure of the hydraulic valve is controlled to be kept constant.
In the prior art, the direct-acting superposition type pressure reducing valve mainly comprises a valve body, a valve core, a front cover, a pressure regulating spring, a pressure regulating plunger and a pressure regulating screw, wherein the pressure regulating spring and the pressure regulating plunger are arranged in an inner hole of the front cover of the pressure reducing valve, the pressure regulating plunger can move in the inner hole of the front cover by rotating the pressure regulating screw, the pressure regulating plunger compresses the pressure regulating spring, and the valve core is pushed by the spring, so that the outlet pressure of the pressure reducing valve is controlled. Wherein, pressure regulating plunger and pressure regulating screw can have two kinds of structures:
As shown in fig. 1, the pressure regulating plunger and the pressure regulating screw are of an integral structure: the structure has the advantages of convenient control of the movement of the pressure regulating plunger in the hole of the front cover, low requirement on the roughness of the hole and convenient processing and manufacturing, and has the defects of higher requirement on the coaxiality of the pressure regulating plunger and the pressure regulating screw, difficult processing and assembly, easy increase of pressure regulating resistance, and incapability of pressure regulating due to the blocking of the pressure regulating plunger when serious and the like.
As shown in fig. 2, the pressure regulating plunger and the pressure regulating screw are of a split structure: the structure is an improvement on the basis of the first structure, solves the problem of high coaxiality requirement on the integrated structure, but easily solves the technical problem that when the pressure regulating plunger moves in the hole, the pressure of the pressure reducing valve cannot be reduced to 0 or the specified minimum initial pressure due to too large friction resistance, and has higher requirement on the inner surface roughness of the inner hole of the front cover of the pressure reducing valve, and a machine tool with higher machining precision is needed, so that the processing cost and difficulty are high.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the pressure reducing valve, wherein the pressure regulating plunger and the pressure regulating screw which are arranged in the inner hole of the front cover of the pressure reducing valve are designed to be of a split structure in a floating connection mode, so that the coaxiality requirements of the pressure regulating plunger and the pressure regulating screw are reduced, and the machining precision of the pressure regulating plunger and the pressure regulating screw and the machining precision of the inner wall of the front cover of the pressure reducing valve are reduced.
The invention relates to a direct-acting superposition type pressure reducing valve, which comprises the following structures:
The valve comprises a valve body, a valve core assembled in an inner cavity of the valve body, a steel ball, a spring seat, a pressure regulating spring, a pressure regulating plunger and a pressure regulating screw which are sequentially assembled and connected from left to right from the right end of the valve core, and a front cover fixed at the front end of the valve body, wherein a first through hole is formed in the front cover and used for installing the pressure regulating screw, and a second through hole is formed in the front cover and used for installing the pressure regulating plunger and the pressure regulating spring.
The structure for further realizing the floating split connection comprises: the pressure regulating screw is sequentially provided with a first external thread connecting section, a polished rod and a second external thread connecting section from right to left, wherein the diameter of the first external thread connecting section is larger than that of the second external thread connecting section, the diameter of the polished rod is larger than that of the polished rod, the threads of the first external thread connecting section and the second external thread connecting section are opposite in rotation direction, and the first external thread connecting section is in threaded connection with the first through hole; the right end of the pressure regulating plunger is sequentially provided with an internal threaded hole and a hollow cutter groove from right to left, the internal diameter of the hollow cutter groove is larger than the external diameter of the second external threaded connecting section, the length of the hollow cutter groove is larger than the length of the second external threaded connecting section, and the second external threaded connecting section is screwed into the hollow cutter groove through the internal threaded hole.
Preferably, the external thread of the first external thread connecting section is a positive thread, and the external thread of the second external thread connecting section is a negative thread.
Further, a groove for installing a sealing ring is formed in the outer circumference of the pressure regulating plunger, so that when pressure is applied to the pressure regulating plunger from the left end, the sealing ring plays a role in preventing hydraulic oil at the left end of the inner hole of the front cover from leaking to the right end.
Further, in order to facilitate the rotation of the pressure regulating screw, a knob is installed at the rightmost side of the pressure regulating screw. The invention has the technical effects that:
1. Compared with the scheme that the pressure regulating screw and the pressure regulating plunger are of an integrated structure, the pressure regulating screw and the pressure regulating plunger are in floating connection, and the following technical problems can be completely solved by utilizing the gap between the pressure regulating screw and the pressure regulating plunger: (1) Because of the coaxiality difference between the pressure regulating screw and the pressure regulating plunger or the coaxiality difference between the first through hole and the second through hole, the pressure regulating plunger has large resistance when moving in the second through hole, even the pressure regulating plunger is blocked in the second through hole, the pressure regulating screw cannot rotate, and finally the pressure regulation cannot be realized; (2) Because of the coaxiality difference between the pressure regulating screw and the pressure regulating plunger or the coaxiality difference between the first through hole and the second through hole, the integral structure of the pressure regulating screw and the pressure regulating plunger cannot be assembled into the assembly hole of the front cover of the pressure reducing valve.
2. Compared with the scheme that the pressure regulating screw and the pressure regulating plunger are completely separated, the invention solves the following technical problems: (1) When the pressure regulating screw of the split structure rotates anticlockwise to reduce pressure, the pressure regulating screw does not force the pressure regulating plunger to pull, the pressure regulating plunger is pushed by compression of the pressure regulating spring to move completely, when the compression amount of the pressure regulating spring is smaller, the pushing force of the pressure regulating plunger is smaller, and when the pushing force cannot overcome the friction force between the pressure regulating plunger and the second through hole, the pressure regulating plunger stops moving, so that the outlet pressure of the pressure reducing valve is not reduced to 0 or the specified minimum initial pressure completely; (2) In order to reduce the friction force between the pressure regulating plunger and the second through hole, the prior art must improve the finish of the second through hole and improve the machining precision, thereby increasing the machining difficulty and improving the machining precision requirement of equipment. According to the invention, as the screw threads of the first external screw thread connecting section and the screw threads of the second external screw thread connecting section are opposite in rotation direction, when the pressure reducing valve is used for reducing pressure, the pressure regulating screw is rotated in the opposite direction to the screw threads of the first external screw thread connecting section, and the pressure regulating screw drives the pressure regulating plunger to move rightwards until the pressure regulating plunger moves to the extreme end, so that the pressure reducing valve is completely relieved.
Drawings
FIG. 1 is a schematic diagram of a pressure reducing valve with a pressure regulating screw and a pressure regulating plunger integrated together in the prior art;
FIG. 2 is a schematic diagram of a pressure reducing valve with a pressure regulating screw and a pressure regulating plunger being completely separated in the prior art;
FIG. 3 is a schematic view showing the structure of a pressure reducing valve in the first embodiment;
FIG. 4 is a schematic view showing the structure of a front cover of a pressure reducing valve in the first embodiment;
FIG. 5 is a schematic view of the structure of a pressure regulating plunger in the first embodiment;
FIG. 6 is a schematic view of the structure of a pressure adjusting screw in the first embodiment;
the valve comprises a valve body, a front cover, a pressure regulating plunger, a sealing ring, a pressure regulating screw, a pressure regulating spring, a groove, a spring seat, a valve core, a rear cover, a steel ball, a first through hole, a second through hole, a 31 internal threaded hole, a 32 hollow groove, a 51, a first external threaded connecting section, a 52 polished rod and a 53 second external threaded connecting section.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 3 to 6, a direct-acting stacked pressure reducing valve, the structure includes: the valve comprises a valve body 1, a valve core 9 assembled in an inner cavity of the valve body, a steel ball 12, a spring seat 8, a pressure regulating spring 6, a pressure regulating plunger 3, a pressure regulating screw 5 and a front cover 2 fixed at the front end of the valve body, wherein the steel ball 12, the spring seat 8, the pressure regulating spring 6, the pressure regulating plunger 3 and the pressure regulating screw 5 are assembled and connected from left to right from the right end of the valve core in sequence, a first through hole 11 is used for installing the pressure regulating screw 3 and the pressure regulating spring 6, an internal thread is arranged in the first through hole 11, the pressure regulating screw 5 is sequentially provided with a first external thread connecting section 51, a polished rod 52 and a second external thread connecting section 53 from right to left, the diameter of the first external thread connecting section 51 is larger than the diameter of the polished rod 52, the external thread of the first external thread connecting section 51 is a positive thread, the external thread of the second external thread connecting section 53 is a reverse thread, the first external thread connecting section 51 is connected with the first through hole 11, the right end of the pressure regulating plunger 3 is sequentially provided with an internal thread hole 31 and a groove 32 from right to left, the second external thread connecting section 53 is provided with a second external thread connecting section 53, and the diameter of the second external thread 53 is not screwed into the hollow section 3 is provided with a sealing ring 3, and the diameter of the hollow section is provided with a second external thread 32, and the diameter of the hollow section is provided with a sealing ring 3, and the hollow section is provided with a diameter 3, and the hollow section is provided with a sealing ring, and has a diameter 3.
The concrete assembly mode of the pressure reducing valve is as follows: after the sealing ring 4 is installed in the groove 7 of the pressure regulating plunger 3, the pressure regulating plunger 3 is installed in the second through hole 21 in the front cover of the pressure reducing valve, the pressure regulating screw 5 is inserted into the first through hole 11, the pressure regulating screw 5 is right-handed until the second external threaded connecting section 53 moves to the position of the internal threaded hole 31 of the pressure regulating plunger, at the moment, the optical axis length of the internal thread in the first through hole 11 is larger than or equal to that of the internal threaded hole 31 by screwing the first external threaded connecting section 51, the pressure regulating screw 5 is reversely rotated, and the second external threaded connecting section 53 is screwed into the internal threaded hole 31 of the pressure regulating plunger until the second external threaded connecting section 53 enters the empty cutter groove 32 of the pressure regulating plunger. Since the diameter of the first external thread connecting section 51 > the diameter of the second external thread connecting section 53 > the diameter of the polish rod 52, and the inner diameter of the clearance groove 32 > the outer diameter of the second external thread connecting section 53, the length of the clearance groove 32 > the length of the second external thread connecting section 53, the pressure regulating plunger 3 is in floating connection with the pressure regulating screw 5, not in fixed connection.
When the pressure regulating screw 5 is rotated clockwise in operation, the first external thread connecting section 5 of the pressure regulating screw 5 is screwed into the first through hole 11, the right end face of the pressure regulating plunger is propped against the end face of the first external thread connecting section 51 close to the polish rod 52, so that the pressure regulating plunger 3 moves leftwards, the pressure regulating plunger 3 pushes the pressure regulating spring 6 to compress the pressure regulating spring, and the pressure regulating spring 6 pushes the pressure reducing valve core to increase the outlet pressure of the pressure reducing valve. When the pressure regulating screw 5 is rotated counterclockwise, since the second male screw connecting section 53 of the pressure regulating screw 3 is a reverse screw, the pressure regulating screw 5 is not screwed out of the female screw hole 31 of the pressure regulating plunger 3, and simultaneously, the pressure regulating plunger 3 is forcibly pulled to move the pressure regulating plunger 3 rightward, the compression amount of the pressure regulating spring 6 is gradually reduced, and the valve core is moved, thereby achieving the pressure reducing effect until the pressure is reduced to 0 or a prescribed minimum initial pressure.
During disassembly, the front cover 2 is disassembled from the valve body 1, then the pressure regulating screw 5 is rotated clockwise to push the pressure regulating plunger 3 to move leftwards until the first external screw thread 51 is completely screwed out of the first through hole 11, the pressure regulating plunger 3 and the pressure regulating screw 5 are separated from the front cover 2, the pressure regulating plunger 3 is fixed, the pressure regulating screw 5 is rotated clockwise, and the second external screw thread connecting section 53 is screwed out of the second through hole 31, so that the separation of the pressure regulating plunger 3 and the pressure regulating screw 5 is realized.
The foregoing disclosure is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the scope of the invention, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced with equivalents thereof, which fall within the scope of the invention as defined by the appended claims.
Claims (2)
1. A direct acting stacked relief valve comprising: the valve comprises a valve body (1), a valve core (9) assembled in an inner cavity of the valve body (1), a steel ball (12), a spring seat (8), a pressure regulating spring (6), a pressure regulating plunger (3), a pressure regulating screw (5) and a front cover (2) fixed at the front end of the valve body, wherein the valve core (9) is assembled in the inner cavity of the valve body (1) from the right end of the valve core (9) from left to right in sequence, a first through hole (11) is formed in the front cover (2) and is used for installing the pressure regulating screw (5), a second through hole (21) is formed in the front cover (2) and is used for installing the pressure regulating plunger (3) and the pressure regulating spring (6), and the pressure regulating screw (5) and the pressure regulating plunger (3) are in floating split connection;
the structure of the floating split connection comprises:
an internal thread is arranged in the first through hole (11);
The pressure regulating screw (5) is sequentially provided with a first external thread connecting section (51), a polished rod (52) and a second external thread connecting section (53) from right to left, the diameter of the first external thread connecting section (51) is larger than that of the second external thread connecting section (53) and larger than that of the polished rod (52), the threads of the first external thread connecting section (51) and the second external thread connecting section (53) are opposite in rotation direction, and the first external thread connecting section (51) is in threaded connection with the first through hole (11);
The right end of the pressure regulating plunger (3) is sequentially provided with an internal threaded hole (31) and a hollow cutter groove (32) from right to left, the inner diameter of the hollow cutter groove (32) is larger than the outer diameter of the second external threaded connecting section (53), the length of the hollow cutter groove (32) is larger than the length of the second external threaded connecting section (53), and the second external threaded connecting section (53) is screwed into the hollow cutter groove (32) through the internal threaded hole (31);
The external thread of the first external thread connecting section (51) is a positive thread, and the external thread of the second external thread connecting section (53) is a negative thread;
the outer circumference of the pressure regulating plunger (3) is provided with a groove (7) for installing the sealing ring (4).
2. A direct-acting stacked pressure relief valve as claimed in claim 1 in which the rightmost end of the pressure regulating screw (5) is provided with a knob.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810819002.1A CN108825835B (en) | 2018-07-24 | 2018-07-24 | Direct-acting superposition type pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810819002.1A CN108825835B (en) | 2018-07-24 | 2018-07-24 | Direct-acting superposition type pressure reducing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108825835A CN108825835A (en) | 2018-11-16 |
| CN108825835B true CN108825835B (en) | 2024-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810819002.1A Active CN108825835B (en) | 2018-07-24 | 2018-07-24 | Direct-acting superposition type pressure reducing valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN108825835B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3912779A1 (en) * | 1989-04-19 | 1990-10-25 | Linde Ag | Pressure restricting valve for hydrostatic gearbox in closed circuit - incorporates hollow adjustment screw whose protruding end has closure screw |
| JPH08179834A (en) * | 1994-12-21 | 1996-07-12 | Ckd Corp | Pressure reducing valve |
| CN2672406Y (en) * | 2003-12-30 | 2005-01-19 | 徐步光 | Safety valve |
| JP2007094545A (en) * | 2005-09-27 | 2007-04-12 | Nippon Seiki Kk | Pressure reduction valve device |
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| CN102042432A (en) * | 2010-12-10 | 2011-05-04 | 北京工业大学 | Direct-acting water pressure overflow valve with damping piston |
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| CN204164444U (en) * | 2014-08-19 | 2015-02-18 | 中国广核集团有限公司 | Pressurized-water reactor nuclear power plant nuclear island reduction valve |
| JP2015052342A (en) * | 2013-09-06 | 2015-03-19 | アズビルＴａｃｏ株式会社 | Fluid jet device |
| CN204628669U (en) * | 2015-04-24 | 2015-09-09 | 焦作市长海机械科技有限公司 | A kind of U-shaped pin quick-acting type reduction valve |
| CN205226511U (en) * | 2015-12-29 | 2016-05-11 | 克拉克过滤器（中国）有限公司 | Pressure regulating valve |
| CN105605261A (en) * | 2016-04-01 | 2016-05-25 | 成都科盛石油科技有限公司 | Gas pressure reduction valve capable of implementing self-closing in case of failure |
| CN106224607A (en) * | 2016-09-26 | 2016-12-14 | 东洋重工机（大连）有限公司 | A kind of screw thread high pressure inserted valve |
| CN208719482U (en) * | 2018-07-24 | 2019-04-09 | 银川市长城液压有限责任公司 | A kind of direct acting stacked compression release valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080111088A1 (en) * | 2006-11-10 | 2008-05-15 | Roper Pump Company | Self-contained relief valve adjustment device |
-
2018
- 2018-07-24 CN CN201810819002.1A patent/CN108825835B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3912779A1 (en) * | 1989-04-19 | 1990-10-25 | Linde Ag | Pressure restricting valve for hydrostatic gearbox in closed circuit - incorporates hollow adjustment screw whose protruding end has closure screw |
| JPH08179834A (en) * | 1994-12-21 | 1996-07-12 | Ckd Corp | Pressure reducing valve |
| CN2672406Y (en) * | 2003-12-30 | 2005-01-19 | 徐步光 | Safety valve |
| JP2007094545A (en) * | 2005-09-27 | 2007-04-12 | Nippon Seiki Kk | Pressure reduction valve device |
| CN201050626Y (en) * | 2007-06-13 | 2008-04-23 | 钟国强 | Valve core and water-saving angle valve applying same |
| CN102042432A (en) * | 2010-12-10 | 2011-05-04 | 北京工业大学 | Direct-acting water pressure overflow valve with damping piston |
| CN202812354U (en) * | 2012-09-24 | 2013-03-20 | 温州美瑞克液压有限公司 | Thread plug-in type pressure-reducing valve |
| JP2015052342A (en) * | 2013-09-06 | 2015-03-19 | アズビルＴａｃｏ株式会社 | Fluid jet device |
| CN204164444U (en) * | 2014-08-19 | 2015-02-18 | 中国广核集团有限公司 | Pressurized-water reactor nuclear power plant nuclear island reduction valve |
| CN204628669U (en) * | 2015-04-24 | 2015-09-09 | 焦作市长海机械科技有限公司 | A kind of U-shaped pin quick-acting type reduction valve |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108825835A (en) | 2018-11-16 |
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