CN109723692B - pressure control valve - Google Patents
pressure control valve Download PDFInfo
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- CN109723692B CN109723692B CN201811554553.6A CN201811554553A CN109723692B CN 109723692 B CN109723692 B CN 109723692B CN 201811554553 A CN201811554553 A CN 201811554553A CN 109723692 B CN109723692 B CN 109723692B
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- pressure control
- control valve
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention relates to a pressure control valve comprising: the valve body is provided with an oil inlet and an oil return port; the valve core is arranged in the valve body in a sliding manner and can separate or conduct the oil inlet and the oil return port; a valve sleeve which is connected to the valve body in a sealing manner and is internally provided with a spring cavity; the pressure regulating assembly comprises a spring seat and a pressure regulating spring which are arranged in the spring cavity, wherein one end of the spring seat penetrates through the spring cavity and extends out of the spring cavity into the air, the other end of the spring seat is used for pushing the valve core, and the spring cavity is communicated with the oil return port; in the hydraulic system with the pressure control valve, the working pressure of the oil inlet of the pressure control valve is not influenced by the back pressure of the oil return port, so that the middle position function of the reversing valve of the hydraulic system can be flexibly selected according to the requirement of an executing element in the hydraulic system, and the design difficulty of the hydraulic system is reduced.
Description
Technical Field
The present invention relates to pressure control elements in hydraulic systems, and more particularly to a pressure control valve.
Background
In the hydraulic system, the pressure control valve like the relief valve, the pressure reducing valve, the balance valve and the sequence valve is an indispensable hydraulic element, and the working principle is that the force acted on the valve core by the spring and the force acted on the valve core by the pressure oil are balanced mutually, so that the force acted on the valve core by the spring is regulated, and the oil pressure can be controlled. In the pressure control valve disclosed in the related art, an oil return port (spring chamber) is generally used to be separately connected to an oil return tank, so as to reduce the influence of back pressure of the oil return port on the controlled oil pressure. However, when the hydraulic system is designed, the middle position function of the reversing valve in the system is difficult to meet the requirement of connecting the two working oil ports to the oil return tank, and at the moment, the oil return port is connected to the oil return tank, so that the design of an oil way of the hydraulic system is complicated.
In view of this, there is a need to propose a new pressure control valve.
Disclosure of Invention
Based on this, it is necessary to provide a pressure control valve that can reduce or even eliminate the back pressure of the spring chamber more conveniently to make the working pressure of the pressure control valve related to the set pressure only, in order to solve the problem that the oil return tank is difficult to connect the spring chamber.
A pressure control valve, the pressure control valve comprising: the valve body is provided with an oil inlet and an oil return port; the valve core is arranged in the valve body in a sliding manner and can separate or conduct the oil inlet and the oil return port, and a first oil duct with one end communicated with the oil return port is formed on the valve core; a valve housing sealingly connected to the valve body and having a spring chamber formed therein; the pressure regulating assembly comprises a spring seat and a pressure regulating spring, the spring seat is arranged in the spring cavity in a sliding mode, the pressure regulating spring is sleeved on the spring seat, one end of the spring seat penetrates through the spring cavity and extends out of the spring cavity into air, the other end of the spring seat is used for pushing the valve core, a second oil duct is formed in the spring seat, and the second oil duct is communicated with the first oil duct and the spring cavity; the pressure regulating spring is sleeved on the spring seat in a compressed state and can push the spring seat towards the oil inlet.
In one embodiment, the spring seat includes a seat body for pushing against the valve spool, and a rod body extending from the seat body toward the outside of the spring chamber in a direction in which the valve spool moves, the rod body having a cross-sectional area equal to a cross-sectional area of the oil inlet.
In one embodiment, a conical hole is formed on one side of the seat body facing the valve core, and a spherical surface capable of extending into the conical hole and contacting with the inner surface of the conical hole is formed on the valve core.
In one embodiment, a conical surface abutting against the oil inlet is formed at one end of the valve core abutting against the oil inlet.
In one embodiment, the valve sleeve is provided with an extending hole at one end of the rod body extending, and the spring cavity is also provided with a sliding sealing plug sleeved on the rod body and sealing the spring cavity.
In one embodiment, a first sealing element for sliding sealing is arranged between the sliding sealing plug and the rod body, and/or a second sealing element for sliding sealing is arranged between the sliding sealing plug and the inner peripheral wall of the spring cavity, and a gasket with one side propping against the sliding sealing plug and the other side propping against the pressure regulating spring is further arranged in the spring cavity.
In one embodiment, the extending hole is further provided with a screw connection with an adjusting screw, one end of the adjusting screw extending into the spring cavity is propped against the sliding sealing plug, and the adjusting screw is further provided with a stepped hole for accommodating the rod body to extend into and be communicated with air.
In one embodiment, the adjusting screw is screwed with a locking nut which is positioned outside the valve sleeve and used for locking the position of the adjusting screw.
In one embodiment, the valve housing includes a first valve housing removably coupled to the valve body and a second valve housing removably coupled to the first valve housing.
In one embodiment, the first oil passage includes a lateral section extending parallel to the oil return port axis direction and a longitudinal section extending in the spool movement direction, and the second oil passage includes a first port extending coaxially with the longitudinal section and a second port communicating the first port to the spring chamber.
In the pressure control valve, one end of the spring seat penetrates through the spring cavity, and one end of the spring seat extends out of the spring cavity to the air, so that acting force of oil pressure in at least part of the spring cavity on the valve core is counteracted, and influence of back pressure of the oil return port on working pressure of the oil inlet is reduced or even eliminated.
Drawings
FIG. 1 is an assembled block diagram of a pressure control valve according to an embodiment of the present invention;
fig. 2 is an assembly view capable of showing the fitting relationship of the spring seat with the sliding seal plug and the valve element.
Description of the reference numerals
1. A valve body; 10. an oil inlet; 11. an oil return port;
2. a valve core; 20. a first oil passage; 200. a transverse section; 201. a longitudinal section; 21. a conical surface;
3. a valve sleeve; 30. a spring cavity; 31. a first valve sleeve; 32. a second valve sleeve; 320. a protruding hole;
4. a pressure regulating assembly; 40. a spring seat; 400. a base; 4000. a tapered bore; 401. a rod body; 402. a second oil passage; 4020. a first duct; 4021. a second orifice; 41. a pressure regulating spring;
5. sliding the sealing plug;
6. a first seal; 60. a second seal;
7. adjusting a screw; 70. a stepped hole;
8. a lock nut;
9. a gasket.
Detailed Description
Referring to fig. 1, a pressure control valve according to an embodiment of the present invention includes a valve body 1 having an oil inlet 10 and an oil return port 11 formed thereon, wherein an oil pressure P of the oil inlet 10 1 The oil pressure P of the oil return port 11 is the operating pressure of the pressure control valve 2 Is the return oil pressure. The inner cavity of the valve body 1 is slidably provided with a valve core 2, and the valve core 2 can separate or communicate the oil inlet 10 and the oil return port 11. The valve housing 3 is connected to one end of the valve body 1, which is disposed away from the oil inlet 10, and one end of the valve housing 3 is sealingly connected to the valve body 1, while the other end is sealed by other sealing means, so as to form a spring chamber 30 inside the valve housing 3. The pressure control valve further comprises a pressure regulating assembly 4 comprising a spring seat 40 slidably arranged inside the valve housing 3, and a pressure regulating spring 41 sleeved on the spring seat 40, wherein: one end of the spring seat 40 directly or indirectly abuts against the valve spool 2, the other end extends out of the spring chamber 30 from the end of the valve housing 3 remote from the valve spool 2, and the one end of the spring seat 40 is directly or indirectly exposed to air so that the pressure received on the one end face of the spring seat 40 is atmospheric pressure. The pressure regulating spring 41 presses the spring seat 40 in a compressed state, and the elastic pressing force of the pressure regulating assembly 4 on the valve core 2 can be regulated by regulating the compression amount of the pressure regulating spring 41, so that one end of the valve core 2 is subjected to the oil pressure P of the oil inlet 10 1 The other end is pressed by the elastic pressing force, and P is the balance of the two 1 The value is the working pressure of the pressure control valve.
Referring to fig. 1 and 2, the valve element 2 has a first oil passage 20 formed therein, and in one embodimentIn this way, the first oil passage 20 includes a lateral section 200 parallel to the axial direction of the oil return port 11, and a longitudinal section 201 extending in the sliding direction of the spool 2 and communicating with the lateral section 200; the spring seat 40 has formed thereon a second oil passage 402 that includes a first bore 4020 disposed coaxially with the longitudinal section 201 and a second bore 4021 that communicates the first bore 4020 to the spring chamber 30. The first oil passage 20 communicates with the oil return port 11, and the second oil passage 402 communicates the first oil passage 20 with the spring chamber 30, so that the oil pressure in the spring chamber 30 is also the oil pressure of the oil return port 11, i.e., P 2 . It should be understood that the first oil passage 20 and the second oil passage 402 in the above description may be provided in other forms, and the two oil passages are not limited to the communication of the spring chamber 30 to the oil return port 11 in the interior of the valve spool 2 and the spring seat 40, and may also be provided in other forms of external oil passages to communicate the spring chamber 30 to the oil return port 11.
The spring seat 40 includes a seat body 400 for pressing the valve core 2 and a rod body 401 disposed on the seat body 400, which may be integrally formed or separately formed and then assembled. Wherein: the rod body 401 extends in the direction of movement of the valve spool 2 and protrudes out of the spring chamber 30 at the end of the valve sleeve 3 remote from the valve spool 2. At least a portion of the aforementioned second oil passage 402 is formed in the rod body 401.
Referring to the structure shown in fig. 2, the cross-sectional area of the rod 401 is A3, and the stress condition of the spool 2 is analyzed as follows:
oil pressure P of oil inlet 10 1 The forces acting on the spool 22 are: f (F) 1 ＝P 1 ×A 1 ；
Oil pressure P of oil return port 11 2 The forces acting on the spool 22 are: f (F) 2 ＝P 2 ×A 2 ；
Oil pressure P in spring chamber 30 2 And the force of the pressure regulating spring 41 acting on the valve spool 2 is:
F 3 ＝P 2 ×(A 1 +A 2 -A 3 )+F spring ；
F 1 And F 2 To push the valve core 2 toward the spring seat 40, F 3 In order to push the valve core 2 towards the oil inlet 10, the force balance formula of the valve core 2 is adoptedF 1 +F 2 ＝F 3 It can be deduced that: p (P) 1 ×A 1 ＝P 2 ×(A 1 -A 3 )+F Spring . It can be seen that at A 3 When the pressure is not zero, the rod body 401 penetrates the spring cavity 30 and extends out of the spring cavity 30, so that the back pressure P can be reduced to a certain extent 2 Oil pressure P for oil inlet 10 1 Is a function of (a) and (b). In particular, when A 3 And A is a 1 When equal, the formula is equal to P 2 The associated forces are removed, at this time the oil pressure P of the oil inlet 10 1 Elastic pressing force F acting on spring seat 40 only by pressure regulating spring 41 Spring And is not affected by the back pressure in the spring chamber 30.
When the spring seat 40 directly abuts against the valve core 2 in the manner shown in fig. 1 and 2, a conical hole 4000 is formed on one side surface of the seat body 400 facing the valve core 2, and a part of the end of the valve core 2 extending into the conical hole 4000 is spherical and tangent to the spherical surface of the inner surface of the conical hole 4000, so that a small amount of coiling can be generated between the valve core 2 and the spring seat 40, and shaking and squeal of the valve core 2 caused by unstable oil flow are reduced. The conical surface 21 is arranged at one end of the valve core 2, which is abutted against the oil inlet 10 of the valve body 1, and the oil inlet 10 is sealed through the contact between the conical surface 21 and the oil inlet 10, and the K-shaped seal formed between the valve core 2 and the oil inlet 10 can reduce or even eliminate the leakage of the pressure regulating valve.
In some embodiments, the valve housing 3 comprises two parts, considering the assembly of the pressure control valve: a first valve housing 31 and a second valve housing 32, wherein: one end of the first valve housing 31 is detachably connected to the valve body 1, and the second valve housing 32 is detachably connected to the other end of the first valve housing 31. The second valve sleeve 32 is formed with an extension hole 320 at the extension position of the rod body 401, and a sliding sealing plug 5 is sleeved on the rod body 401 for better sealing the spring cavity 30. The sliding seal plug 5 is located entirely within the spring chamber 30, and a first seal 6 is provided between the sliding seal plug 5 and the rod body 401 to seal both, and a second seal 60 is provided between the sliding seal plug 5 and the inner peripheral wall of the spring chamber 30 to seal both, so that the sliding seal plug 5 is formed as a "cap" of the spring chamber 30, and the sealing of the side wall and the bottom wall of the spring chamber 30 is achieved by the screw-on sealing of the first valve sleeve 31 and the second valve sleeve 32 and the screw-on sealing of the first valve sleeve 31 and the valve body 1, respectively.
It will be appreciated that the sliding closure 5 is not the only way to seal the spring cavity 30 and that the sliding closure 5 may be eliminated when a reliable sliding seal is formed between the stem 401 and the protruding bore 320. Further, a gasket 9 is further disposed in the spring cavity 30, one side surface of the gasket 9 abuts against the sliding sealing plug 5, and the upper end of the pressure regulating spring 41 abuts against the other side surface of the gasket 9, so that the pressure regulating spring 41 is kept in a compressed state or is further compressed.
The adjusting screw rod 7 is arranged on the extending hole 320, the adjusting screw rod 7 is in threaded connection with the extending hole 320, one end of the adjusting screw rod extends into the spring cavity 30 to press the sliding sealing plug 5, the adjusting screw rod 7 is rotated to control the length of the adjusting screw rod extending into the spring cavity 30, the position of the sliding sealing plug 5 can be controlled, and then the compression amount of the pressure adjusting spring 41 is adjusted.
In some embodiments, a stepped hole 70 is formed on one end of the adjusting screw 7 extending into the spring cavity 30, and the upper end of the rod 401 may extend into the stepped hole 70, and the end of the stepped hole 70 extending away from the rod 401 is communicated with air, so that the pressure of the upper end face of the rod 401 is atmospheric pressure.
The adjusting screw 7 is provided with a locking nut 8 located outside the spring chamber 30, which is in threaded engagement with the part of the adjusting screw 7 extending out of the second valve sleeve 32 and serves to lock the position of the adjusting screw 7.
In the hydraulic system using the pressure control valve, the working pressure of the oil inlet of the pressure control valve is not influenced by the back pressure of the oil return port, so that the median function of the reversing valve of the hydraulic system is not limited, and the hydraulic system can be properly selected according to the requirement of an executing element in the hydraulic system.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (6)
1. A pressure control valve, the pressure control valve comprising:
the valve body (1) is provided with an oil inlet (10) and an oil return port (11);
the valve core (2) is arranged in the valve body (1) in a sliding manner and can separate or conduct the oil inlet (10) and the oil return port (11), and a first oil duct (20) with one end communicated with the oil return port (11) is formed on the valve core (2);
a valve housing (3) which is sealingly connected to the valve body (1) and has a spring chamber (30) formed therein;
the pressure regulating assembly (4) comprises a spring seat (40) which is arranged in the spring cavity (30) in a sliding way, and a pressure regulating spring (41) which is sleeved on the spring seat (40), wherein,
one end of the spring seat (40) penetrates through the spring cavity (30) and extends out of the spring cavity (30) into the air, the other end of the spring seat is used for pushing the valve core (2), a second oil duct (402) is formed on the spring seat (40), and the second oil duct (402) is communicated with the first oil duct (20) and the spring cavity (30);
the pressure regulating spring (41) is sleeved on the spring seat (40) in a compressed state and can push the spring seat (40) towards the oil inlet (10); the spring seat (40) comprises a seat body (400) for pushing the valve core (2), and a rod body (401) extending from the seat body (400) towards the outside of the spring cavity (30) along the moving direction of the valve core (2), wherein the cross-sectional area of the rod body (401) is equal to the cross-sectional area of the oil inlet (10); a conical hole (4000) is formed on one side surface of the seat body (400) facing the valve core (2), and a spherical surface which can extend into the conical hole (4000) and is in contact with the inner surface of the conical hole (4000) is formed on the valve core (2);
an extending hole (320) is formed at one end of the valve sleeve (3) extending out of the rod body (401), and a sliding sealing plug (5) which is sleeved on the rod body (401) and seals the spring cavity (30) is further arranged in the spring cavity (30);
the first oil passage (20) includes a lateral section (200) extending parallel to an axial direction of the oil return port (11) and a longitudinal section (201) extending in a moving direction of the spool (2), and the second oil passage (402) includes a first channel (4020) extending coaxially with the longitudinal section (201), and a second channel (4021) communicating the first channel (4020) to the spring chamber (30).
2. The pressure control valve according to claim 1, characterized in that an end of the valve spool (2) abutting against the oil inlet (10) is formed with a conical surface (21) abutting against the oil inlet (10).
3. Pressure control valve according to claim 1, characterized in that a first seal (6) of both sliding seals is arranged between the sliding seal plug (5) and the stem body (401) and/or a second seal (60) of both sliding seals is arranged between the sliding seal plug (5) and the inner peripheral wall of the spring chamber (30), a gasket (9) being arranged in the spring chamber (30) with one side against the sliding seal plug (5) and the other side against the pressure regulating spring (41).
4. A pressure control valve according to claim 3, characterized in that the extending hole (320) is further provided with a screw-connected adjusting screw (7), one end of the adjusting screw (7) extending into the spring cavity (30) is pressed against the sliding sealing plug (5), and the adjusting screw (7) is further provided with a stepped hole (70) for accommodating the rod body (401) to extend into and be communicated with the air.
5. Pressure control valve according to claim 4, characterized in that the adjusting screw (7) is screwed with a locking nut (8) located outside the valve sleeve (3) and adapted to lock the position of the adjusting screw (7).
6. The pressure control valve according to claim 1, characterized in that the valve sleeve (3) comprises a first valve sleeve (31) detachably connected to the valve body (1), and a second valve sleeve (32) detachably connected to the first valve sleeve (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811554553.6A CN109723692B (en) | 2018-12-18 | 2018-12-18 | pressure control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811554553.6A CN109723692B (en) | 2018-12-18 | 2018-12-18 | pressure control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109723692A CN109723692A (en) | 2019-05-07 |
| CN109723692B true CN109723692B (en) | 2023-11-03 |
Family
ID=66296809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811554553.6A Active CN109723692B (en) | 2018-12-18 | 2018-12-18 | pressure control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109723692B (en) |
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| CN1040420A (en) * | 1989-05-19 | 1990-03-14 | 刘长年 | Multifunctional floating pressure control valve |
| DE102005057489A1 (en) * | 2005-12-01 | 2007-06-06 | Bosch Rexroth Ag | Hydraulic valve e.g. pressure, flow or distribution valve, has spring plate with external thread, which is screwed into thread section of valve housing |
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| CN204610409U (en) * | 2015-05-06 | 2015-09-02 | 浙江海宏液压科技股份有限公司 | A kind of control valve |
| CN104989690A (en) * | 2015-06-29 | 2015-10-21 | 象山盛韵汽配科技有限公司 | Overload relief valve |
| CN105065360A (en) * | 2015-08-31 | 2015-11-18 | 苏州萨伯工业设计有限公司 | Constant-power control device and pressure variable control method thereof |
| CN105179349A (en) * | 2015-09-23 | 2015-12-23 | 中国煤炭科工集团太原研究院有限公司 | Automatic pressure switching selector valve |
| CN105697828A (en) * | 2016-03-11 | 2016-06-22 | 柳州柳工液压件有限公司 | Hydraulic control one-way valve |
| DE102016200458A1 (en) * | 2015-01-16 | 2016-07-21 | Xuzhou Construction Machinery Group Co., Ltd. | Load sensing multiway valve and hydraulic system of a technical machine |
| CN106545486A (en) * | 2015-09-21 | 2017-03-29 | 北京通汇知压缩机制造有限公司 | Membrane compressor servo valve |
| WO2017097267A1 (en) * | 2015-12-07 | 2017-06-15 | 常州市康士达机电有限公司 | Electromagnetic directional control valve |
| CN108087364A (en) * | 2017-12-19 | 2018-05-29 | 番禺珠江钢管（珠海）有限公司 | A kind of double pressure unloading valves |
-
2018
- 2018-12-18 CN CN201811554553.6A patent/CN109723692B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1040420A (en) * | 1989-05-19 | 1990-03-14 | 刘长年 | Multifunctional floating pressure control valve |
| DE102005057489A1 (en) * | 2005-12-01 | 2007-06-06 | Bosch Rexroth Ag | Hydraulic valve e.g. pressure, flow or distribution valve, has spring plate with external thread, which is screwed into thread section of valve housing |
| CN202579413U (en) * | 2012-05-31 | 2012-12-05 | 常德中联重科液压有限公司 | Direct-acting overflow valve, direct-acting overflow valve group and hydraulic overflow loop |
| DE102016200458A1 (en) * | 2015-01-16 | 2016-07-21 | Xuzhou Construction Machinery Group Co., Ltd. | Load sensing multiway valve and hydraulic system of a technical machine |
| CN204610409U (en) * | 2015-05-06 | 2015-09-02 | 浙江海宏液压科技股份有限公司 | A kind of control valve |
| CN104989690A (en) * | 2015-06-29 | 2015-10-21 | 象山盛韵汽配科技有限公司 | Overload relief valve |
| CN105065360A (en) * | 2015-08-31 | 2015-11-18 | 苏州萨伯工业设计有限公司 | Constant-power control device and pressure variable control method thereof |
| CN106545486A (en) * | 2015-09-21 | 2017-03-29 | 北京通汇知压缩机制造有限公司 | Membrane compressor servo valve |
| CN105179349A (en) * | 2015-09-23 | 2015-12-23 | 中国煤炭科工集团太原研究院有限公司 | Automatic pressure switching selector valve |
| WO2017097267A1 (en) * | 2015-12-07 | 2017-06-15 | 常州市康士达机电有限公司 | Electromagnetic directional control valve |
| CN105697828A (en) * | 2016-03-11 | 2016-06-22 | 柳州柳工液压件有限公司 | Hydraulic control one-way valve |
| CN108087364A (en) * | 2017-12-19 | 2018-05-29 | 番禺珠江钢管（珠海）有限公司 | A kind of double pressure unloading valves |
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| CN109723692A (en) | 2019-05-07 |
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Address after: 689 Jiefang Road, Diankou Industrial Zone, Zhuji County, Shaoxing City, Zhejiang Province Applicant after: Zhejiang Huayi Precision Machinery Co.,Ltd. Address before: 689 Jiefang Road, Diankou Industrial Zone, Zhuji County, Shaoxing City, Zhejiang Province Applicant before: ZHEJIANG HUAYI PRECISION MACHINERY Co.,Ltd. |
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Effective date of registration: 20230914 Address after: 311800 Diankou Town Industrial Zone, Zhuji City, Shaoxing City, Zhejiang Province Applicant after: Zhejiang Sanshang Zhidi Technology Co.,Ltd. Address before: No. 689 Jiefang Road, Zhuji County, Shaoxing, Zhejiang Applicant before: Zhejiang Huayi Precision Machinery Co.,Ltd. |
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