CN111577690A - Hydraulic control valve group - Google Patents

Hydraulic control valve group Download PDF

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Publication number
CN111577690A
CN111577690A CN202010248736.6A CN202010248736A CN111577690A CN 111577690 A CN111577690 A CN 111577690A CN 202010248736 A CN202010248736 A CN 202010248736A CN 111577690 A CN111577690 A CN 111577690A
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CN
China
Prior art keywords
valve
control
communicated
hole
section
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Pending
Application number
CN202010248736.6A
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Chinese (zh)
Inventor
洪威
方敏
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Wuhan Marine Machinery Plant Co Ltd
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Wuhan Marine Machinery Plant Co Ltd
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Priority to CN202010248736.6A priority Critical patent/CN111577690A/en
Publication of CN111577690A publication Critical patent/CN111577690A/en
Pending legal-status Critical Current

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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
    • F15B13/021—Valves for interconnecting the fluid chambers of an actuator
    • 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
    • F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
    • 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
    • F15B13/025—Pressure reducing valves
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Safety Valves (AREA)

Abstract

The utility model provides a hydraulic control valve group belongs to the hydraulic pressure device field. The hydraulic control valve group comprises a valve body and a valve cover, wherein a main oil inlet, a main oil return port, a main control oil port and a communicating oil port are formed in the valve body; the directional valve is fixedly installed on the valve body, a first control oil port of the directional valve is communicated with the inlet section, a second control oil port of the directional valve is communicated with the middle section, a working oil port of the directional valve is communicated with the control cavity, and when an oil pressure difference value between the first control oil port and the second control oil port is larger than a set threshold value of the directional valve, the working oil port is communicated with the second control oil port. The flow can be effectively controlled through the hydraulic control valve group.

Description

Hydraulic control valve group
Technical Field
The disclosure belongs to the field of hydraulic devices, and particularly relates to a hydraulic control valve group.
Background
In a hydraulic system, an actuator is generally controlled by hydraulic control valve groups with different functions to realize various actions of the actuator. For example, when the rotation speed of the actuator needs to be controlled, hydraulic components such as a pressure reducing valve, a controllable throttle valve, a pressure compensator and the like can be connected and combined into a hydraulic control valve group through oil pipes, so that the rotation speed of the actuator can be controlled by the hydraulic control valve group.
However, since each hydraulic component has an independent valve body, the hydraulic control valve block is bulky and occupies a large installation space. Moreover, the hydraulic control valve group has a large number of parts, and part of the control oil circuit is located outside the control valve, so that the integration level and reliability of the control valve are not high.
Disclosure of Invention
The embodiment of the disclosure provides a hydraulic control valve group, which can solve the problem that the hydraulic control valve group occupies a large amount of installation space. The technical scheme is as follows:
the disclosed embodiment provides a hydraulic control valve group, which comprises a valve body and a valve cover arranged at one end of the valve body, wherein the valve body is provided with a main oil inlet, a main oil return port, a main control oil port and a communication oil port;
the valve sleeve is fixedly inserted into the valve body, a control hole is formed in the valve sleeve, and the control hole is communicated with the main oil inlet;
the valve core is slidably arranged in the valve cover, a pressure reducing hole is formed in the valve core, one end of the valve core is sealed and is arranged towards the valve cover to form a control cavity, the control cavity is communicated with the main control oil port, and an opening used for communicating the pressure reducing hole with the Venturi tube is formed in the other end of the valve core;
the Venturi tube is fixedly inserted into the valve body and comprises an inlet section, a middle section and an outlet section which extend in sequence back to the valve cover, the outer wall of one end of the inlet section is in sealing fit with the inner wall of the valve body, one end of the inlet section is communicated with the opening of the valve core, and the middle section is respectively communicated with the other end of the inlet section and one end of the outlet section;
the directional valve is fixedly installed on the valve body, a first control oil port of the directional valve is communicated with the inlet section, a second control oil port of the directional valve is communicated with the middle section, a working oil port of the directional valve is communicated with the control cavity, and when an oil pressure difference value between the first control oil port and the second control oil port is larger than a set threshold value of the directional valve, the working oil port is communicated with the second control oil port.
In one implementation manner of the present disclosure, the inlet section includes an equal-diameter section and a contraction section, one end of the equal-diameter section is communicated with the opening of the valve element, the other end of the equal-diameter section is communicated with the contraction section, the inner diameter of the contraction section gradually decreases from one end communicated with the equal-diameter section to the other end, and the intermediate section is communicated with the other end of the contraction section.
In another implementation manner of the present disclosure, a plurality of first through holes are formed in a circumferential wall of the constant-diameter section, and each of the first through holes is communicated with the first control oil port of the directional valve through a first oil passage formed in the valve body.
In another implementation manner of the present disclosure, a plurality of second through holes are formed in a circumferential wall of the middle section, and each of the second through holes is communicated with the second control oil port of the directional valve through a second oil passage formed in the valve body.
In another implementation manner of the present disclosure, the valve cover is a disc-shaped structure, a circular hole is formed at an end of the valve cover facing the valve body, and an end of the valve sleeve is accommodated in the circular hole to form the control chamber.
In another implementation manner of the present disclosure, a first axial hole, a second axial hole and a radial hole are disposed in the valve cover, the first axial hole is communicated with the main control oil port, the second axial hole is communicated with the control cavity, and the radial hole is respectively communicated with the first axial hole and the second axial hole.
In still another implementation manner of the present disclosure, the control hole is a long hole, and a length direction of the control hole is the same as a moving direction of the valve element.
In another implementation manner of the present disclosure, the valve sleeve is a cylindrical structure with openings at two ends, a support boss is disposed on an inner wall of the valve sleeve near one end of the venturi tube, and the support boss is disposed opposite to one end of the valve core near the venturi tube.
In another implementation manner of the present disclosure, a first sealing member, a second sealing member and a third sealing member are disposed at intervals on the outer circumferential wall of the valve sleeve, the first sealing member is sandwiched between the valve sleeve and the valve cover, the second sealing member and the third sealing member are both sandwiched between the valve sleeve and the valve body, and the control hole is located between the second sealing member and the third sealing member.
In another implementation manner of the present disclosure, a fourth sealing element and a fifth sealing element are disposed on an outer wall of the venturi tube, the fourth sealing element and the fifth sealing element are both clamped between the valve body and the venturi tube, the fourth sealing element is axially disposed between the first through hole and the second through hole, and the fifth sealing element is axially disposed on one side of the second through hole close to the outlet section.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
after the hydraulic control valve group provided by the embodiment is applied to a hydraulic system, a main oil inlet is communicated with a main oil pressing pipe of the hydraulic system, a main oil return port is communicated with a main oil return pipe of the hydraulic system, an outlet section is communicated with an oil inlet of an executing element in the hydraulic system, a communication oil port is communicated with an oil return port of the executing element, namely the oil return port of the executing element is communicated with the main oil return port through a communication oil port.
When the main control oil port has no oil pressure, because the execution element has load oil pressure, the pressure of the opening end of the valve core is greater than the pressure in the control cavity, the valve core moves to the maximum position towards the sealing end of the valve core, the pressure reducing hole of the valve core is completely separated from the control hole of the valve sleeve, and the hydraulic oil of the main oil inlet of the valve body cannot enter the valve core.
When the pressure of the control oil is increased, the valve core moves a certain distance to the opening end under the action of the pressure of the control oil, the pressure reducing hole of the valve core and the control hole in the valve sleeve are communicated to form an opening with a certain size, and the hydraulic oil sequentially passes through the main oil inlet, the control hole, the pressure reducing hole, the opening, the inlet section, the middle section and the outlet section, so that the pressure reduction of the hydraulic oil is realized. The hydraulic oil finally enters the oil inlet of the execution element to drive the execution element to work. If the load driven by the actuator is an inertial load, the greater the rotation speed, the greater the required driving torque, and the greater the pressure at the open end of the valve element, and when the pressure at the opening is equal to the pressure in the control chamber, the valve element is held at a constant position, and the opening between the control orifice and the relief orifice is constant. Further, the greater the pressure in the control chamber, the greater the flow rate output by the hydraulic control valve, and the greater the pressure.
In addition, because this hydraulic control valves still includes the directional valve, so when the pressure difference value of venturi's entry section and interlude exceeded the settlement threshold value of directional valve, the case of directional valve overcomes its self spring force effect under the effect of the pressure differential of the second control hydraulic fluid port of first control hydraulic fluid port and directional valve to remove to another work position, make the second control hydraulic fluid port of the work hydraulic fluid port and directional valve of directional valve communicate. And because the working oil port of the directional valve is communicated with the control cavity, the control oil in the control cavity sequentially passes through the working oil port and the second control oil port of the directional valve and enters the middle section of the Venturi tube, so that the pressure in the control cavity is reduced, the valve core moves towards the sealing end, the opening between the control hole and the pressure reducing hole is reduced, the flow is reduced, and the flow of the hydraulic control valve is limited. The hydraulic control valve group in the embodiment effectively controls the flow of the hydraulic control valve through the directional valve.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a longitudinal cross-sectional view of a hydraulic control valve block provided by an embodiment of the present disclosure;
FIG. 2 is a longitudinal cross-sectional view of a third oil gallery provided in accordance with an embodiment of the present disclosure;
FIG. 3 is a longitudinal cross-sectional view of a directional valve provided in accordance with an embodiment of the present disclosure;
FIG. 4 is a longitudinal cross-sectional view of a valve cover provided by an embodiment of the present disclosure;
FIG. 5 is a transverse cross-sectional view of a directional valve provided by an embodiment of the present disclosure;
FIG. 6 is a first longitudinal cross-sectional view of a relief valve provided in accordance with an embodiment of the present disclosure;
FIG. 7 is a longitudinal cross-sectional view of a fourth oil gallery provided in accordance with an embodiment of the present disclosure;
FIG. 8 is a second longitudinal cross-sectional view of a relief valve provided in accordance with an embodiment of the present disclosure.
The symbols in the drawings represent the following meanings:
1. a valve body; 101. a main oil inlet; 102. a main oil return port; 103. a main control oil port; 104. the oil port is communicated; 11. a first oil passage; 12. a second oil passage; 121. a first duct; 122. a second duct; 13. a third oil passage; 131. a first control gallery; 132. a second control oil passage; 133. a third control gallery; 14. a fourth oil passage; 141. a first overflow channel; 142. a second overflow channel; 15. a fifth oil passage; 151. a first overflow channel; 152. a second overflow channel; 153. a third overflow channel;
2. a valve cover; 20. a circular hole; 21. a first axial bore; 22. a second axial bore; 23. a radial bore;
3. a valve housing; 31. a control hole; 32. supporting the boss;
4. a valve core; 40. a control chamber; 41. a pressure relief vent; 42. an opening;
5. a venturi tube; 51. an inlet section; 510. a first inner tank; 511. a constant diameter section; 512. a contraction section; 513. a first through hole; 52. a middle section; 520. a second inner tank; 521. a second through hole; 53. an outlet section;
6. a directional valve; 601. a first control oil port of the directional valve; 602. a second control oil port of the directional valve; 603. a working oil port of the directional valve;
7. an overflow valve; 701. a control oil port of the overflow valve; 702. a working oil port of the overflow valve;
81. a first seal member; 82. a second seal member; 83. a third seal member; 84. a fourth seal member; 85. and a fifth seal.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The embodiment of the present disclosure provides a hydraulic control valve group, as shown in fig. 1, the hydraulic control valve group includes a valve body 1 and a valve cover 2 installed at one end of the valve body 1, the valve body 1 is provided with a main oil inlet 101, a main oil return port 102, a main control oil port 103 (see fig. 2) and a communication oil port 104, the hydraulic control valve group further includes a valve sleeve 3, a valve core 4, a venturi tube 5 and a directional valve 6 (see fig. 3), and the communication oil port 104 is communicated with the main oil return port 102.
The valve sleeve 3 is fixedly inserted in the valve body 1, a control hole 31 is formed in the valve sleeve 3, and the control hole 31 is communicated with the main oil inlet 101.
The valve core 4 is slidably installed in the valve housing 3, a pressure reducing hole 41 is formed in the valve core 4, one end of the valve core 4 is sealed and is arranged toward the valve cover 2 to form a control cavity 40, the control cavity 40 is communicated with the main control oil port 103, and an opening 42 for communicating the pressure reducing hole 41 with the venturi tube 5 is formed in the other end of the valve core 4.
Venturi tube 5 is fixed cartridge in valve body 1, and Venturi tube 5 includes inlet section 51, interlude 52 and the export section 53 that extends in proper order dorsad valve gap 2, and inlet section 51's one end outer wall and valve body 1's inner wall sealing fit, and inlet section 51's one end and the opening 42 intercommunication of case 4, interlude 52 communicates with inlet section 51's the other end and the one end of export section 53 respectively.
Fig. 3 is a longitudinal sectional view of the directional valve provided in the embodiment of the present disclosure, with reference to fig. 3, the directional valve 6 is fixedly installed on the valve body 1, the first control oil port 601 of the directional valve 6 is communicated with the inlet section 51, the second control oil port 602 of the directional valve 6 is communicated with the middle section 52, the working oil port 603 of the directional valve 6 is communicated with the control chamber 40, and when an oil pressure difference between the first control oil port 601 and the second control oil port 602 is greater than a set threshold of the directional valve 6, the working oil port 603 is communicated with the second control oil port 602.
After the hydraulic control valve set provided by this embodiment is applied to a hydraulic system, the main oil inlet 101 is communicated with a main oil pipe of the hydraulic system, the main oil return port 102 is communicated with a main oil return pipe of the hydraulic system, the outlet section 53 is communicated with an oil inlet of an execution element in the hydraulic system, and the communication oil port 104 is communicated with an oil return port of the execution element, that is, the oil return port of the execution element is communicated with the main oil return port 102 through the communication oil port 104.
When the main control oil port 103 has no oil pressure, because the actuator itself has a load oil pressure, the pressure at the open end of the valve core 4 is greater than the pressure in the control chamber 40, the valve core 4 moves to the maximum position toward the sealed end thereof, the pressure reducing hole 41 of the valve core 4 is completely separated from the control hole 31 of the valve housing 3, and the hydraulic oil in the main oil inlet 101 of the valve body 1 cannot enter the valve core 4.
When the pressure of the control oil is increased, the valve core 4 moves a certain distance to the opening end under the action of the pressure of the control oil, the pressure reducing hole 41 of the valve core 4 and the control hole 31 in the valve sleeve 3 start to be communicated and form an opening with a certain size, and the hydraulic oil sequentially passes through the main oil inlet 101, the control hole 31, the pressure reducing hole 41, the opening 42, the inlet section 51, the middle section 52 and the outlet section 53, so that the pressure reduction of the hydraulic oil is realized. The hydraulic oil finally enters the oil inlet of the execution element to drive the execution element to work. If the load driven by the actuator is an inertial load, the greater the rotation speed, the greater the required drive torque, and the greater the pressure at the open end of the valve element 4, and if the pressure at the opening 42 is equal to the pressure in the control chamber 40, the position of the valve element 4 is held and the opening between the control port 31 and the relief port 41 is held. Further, the greater the pressure in the control chamber 40, the greater the flow rate of the hydraulic control valve output, and the greater the pressure.
In addition, since the hydraulic control valve group further includes the directional valve 6, when the pressure difference between the inlet section 51 and the middle section 52 of the venturi tube 5 exceeds the set threshold of the directional valve 6, the valve core of the directional valve 6 overcomes the spring force thereof under the action of the pressure difference between the first control oil port 601 and the second control oil port 602 of the directional valve, and moves to another working position, so that the working oil port 603 of the directional valve communicates with the second control oil port 602 of the directional valve. Since the working oil port 603 of the directional valve is communicated with the control chamber 40, the control oil in the control chamber 40 sequentially passes through the working oil port 603 and the second control oil port 602 of the directional valve and enters the middle section 52 of the venturi tube 5, so that the pressure in the control chamber 40 is reduced, the valve core 4 moves toward the sealing end, the opening between the control hole 31 and the pressure reducing hole 41 is reduced, and the flow rate is reduced, thereby limiting the flow rate of the hydraulic control valve. The hydraulic control valve group in the embodiment effectively controls the flow of the hydraulic control valve through the directional valve 6.
Illustratively, a filter screen is arranged at the main control oil port 103 of the valve body 1, the filter screen is fixed in an internal hole channel at the main control oil port 103 of the valve body 1 through threaded connection, and the filter screen is used for preventing impurities in an oil inlet pipe controlled by a hydraulic system from entering the hydraulic control valve.
Fig. 4 is a longitudinal sectional view of a valve cover provided by the embodiment of the present disclosure, and in conjunction with fig. 4, optionally, the valve cover 2 has a circular disc-shaped structure, one end of the valve cover 2 facing the valve body 1 is provided with a circular hole 20, and one end of the valve sleeve 3 is accommodated in the circular hole 20 to form a control chamber 40.
In the above implementation, the circular hole 20 on the valve cover 2 is used for accommodating the valve sleeve 3, so that a control chamber 40 can be formed between the valve cover 2 and the sealed end of the valve core 4 to control the movement of the valve core 4.
Optionally, a first axial hole 21, a second axial hole 22 and a radial hole 23 are arranged in the valve cover 2, the first axial hole 21 is communicated with the main control oil port 103, the second axial hole 22 is communicated with the control cavity 40, and the radial hole 23 is respectively communicated with the first axial hole 21 and the second axial hole 22.
In the implementation manner, the first axial hole 21 and the second axial hole 22 extend along the axial direction of the valve cap 2, the radial hole 23 extends perpendicular to the axial direction of the valve cap 2, the first axial hole 21 is used for being communicated with the main control oil port 103, the second axial hole 22 and the radial hole 23 are used for communicating the first axial hole 21 with the control cavity 40, and the main control oil port 103 on the valve body can be communicated with the control cavity 40 through the first axial hole 21, the second axial hole 22 and the radial hole 23, so that hydraulic oil can be introduced into the circular hole 20.
Optionally, a damping is provided in the radial bore 23 of the valve cover 2, which is fixed by a screw connection, the damping being used to reduce vibrations of the valve cartridge 4 when the control oil pressure changes drastically
Referring again to fig. 1, optionally, the valve sleeve 3 is a cylindrical structure with two open ends, and a support boss 32 is provided on an inner wall of the valve sleeve 3 near one end of the venturi tube 5, and the support boss 32 is arranged opposite to one end of the valve core 4 near the venturi tube 5.
In the above implementation, since the hydraulic control valve set is vertically placed, a fixed connection may not be required between the valve core 4 and the valve sleeve 3, and the valve core 4 can directly rest on the support boss 32 to be matched with the valve cover 2 so as to fixedly clamp the valve core 4 between the valve cover 2 and the support boss 32.
Alternatively, the control hole 31 is a long hole, and the longitudinal direction of the control hole 31 is the same as the moving direction of the spool 4.
In the implementation manner, along with the movement of the valve core 4, the control hole 31 and the pressure reducing hole 41 move relatively, so that the opening degree between the control hole 31 and the pressure reducing hole 41 is changed, and the oil inlet can be implemented more stably because the control hole 31 is a long hole.
Optionally, a first sealing member 81, a second sealing member 82 and a third sealing member 83 are spaced apart from the outer circumferential wall of the valve housing 3, the first sealing member 81 is interposed between the valve housing 3 and the valve cover 2, the second sealing member 82 and the third sealing member 83 are both interposed between the valve housing 3 and the valve body 1, and the control hole 31 is located between the second sealing member 82 and the third sealing member 83.
In the above implementation, the first sealing element 81, the second sealing element 82 and the third sealing element 83 may be sealing rings, and the first sealing element 81 is clamped between the valve housing 3 and the valve cover 2, so that hydraulic oil leakage of the control channel in the main control oil port 103 is avoided. The second sealing member 82 and the third sealing member 83 are respectively arranged on two sides of the pressure reducing hole 41 and the control hole 31, so that the hydraulic oil in the main oil inlet 101 can be prevented from leaking through the valve sleeve 3.
Illustratively, the valve core 4 is a cylindrical structure, a plurality of pressure reducing holes 41 are uniformly distributed on the peripheral wall of the valve core 4, the pressure reducing holes 41 are circular holes, and the pressure reducing holes 41 are communicated with an opening 42 of the valve core 4.
In the above manner, the plurality of relief holes 41 may be provided by securing the communication with the plurality of control holes 31.
Illustratively, the venturi tube 5 has a tubular structure, the inlet section 51 includes a constant diameter section 511 and a contraction section 512, one end of the constant diameter section 511 is communicated with the opening 42 of the valve core 4, the other end of the constant diameter section 511 is communicated with the contraction section 512, the inner diameter of the contraction section 512 is gradually reduced from one end communicated with the constant diameter section 511 to the other end, and the intermediate section 52 is communicated with the other end of the contraction section 512.
In the implementation manner, by providing the equal-diameter section 511 and the contraction section 512, when hydraulic oil flows through the venturi tube 5, the hydraulic pressure in the equal-diameter section 511 is greater than the hydraulic pressure in the contraction section 512, so that the hydraulic pressure in the equal-diameter section 511 and the hydraulic pressure in the contraction section 512 form a proper pressure drop, and further cooperate with the directional valve 6 to further adjust the maximum flow rate of the hydraulic control valve group.
Illustratively, the inner diameter of the constant diameter section 511 is equal to the diameter of the opening 42 of the valve core 4, the inner diameter of the small end of the contraction section 512 is equal to the inner diameter of the middle section 52, the outlet section 53 is a conical hole, and the small end of the outlet section 53 is communicated with the middle section 52.
In the above implementation, the inner diameter of the constant diameter section 511 is equal to the diameter of the opening 42 of the valve core 4, and the inner diameter of the small end of the contraction section 512 is equal to the inner diameter of the middle section 52, so that a proper hydraulic pressure drop can be effectively ensured to be formed between the constant diameter section 511 and the contraction section 512. The outlet section 53 is a conical bore which reduces the flow rate of the hydraulic oil which is gradually accelerated in the intermediate section 52, reducing turbulence and controlling head loss.
Fig. 3 is a longitudinal cross-sectional view of a directional valve provided in an embodiment of the present disclosure, and in conjunction with fig. 3, optionally, a plurality of first through holes 513 are formed in a peripheral wall of the equal-diameter section 511, and each of the first through holes 513 is communicated with a first control oil port 601 of the directional valve 6 through a first oil passage 11 on the valve body 1.
In the above implementation, the first through hole 513 is used to communicate with the first control port 601 of the directional valve 6.
Illustratively, the constant-diameter section 511 is provided with first inner grooves 510 on a peripheral wall thereof, and each of the first through holes 513 communicates with the first inner groove 510. The first oil duct 11 is a horizontal passage, the first oil duct 11 is arranged perpendicular to the axis of the valve body 1, one end of the first oil duct 11 is communicated with the first control oil port 601 of the directional valve 6, and the other end of the first oil duct 11 is communicated with the first inner groove 510.
In the above implementation, the first inner tank 510 may collect the hydraulic fluid flowing out of each of the first through holes 513 in the inlet section 51 into the first inner tank 510, and then communicate the hydraulic fluid in the first inner tank 510 with the first control fluid port 601 of the directional valve 6 through the first oil passage 11. That is, the first control port 601 of the directional valve 6 can be conveniently communicated with the inside of the inlet section 51 by the mutual engagement of the first inner tank 510 and the first oil passage 11.
Illustratively, the first through holes 513 may be 4 circular holes, and the 4 first through holes 513 are all uniformly distributed on the peripheral wall of the inlet section 51.
In the above implementation manner, the 4 circular holes are provided, so that the oil inside the equal-diameter section 511 can uniformly flow into the first inner tank 510, and the pressure inside the equal-diameter section 511 can be ensured to be stably consistent with the first control oil port 601 of the directional valve 6.
Optionally, a plurality of second through holes 521 are provided on the peripheral wall of the middle section 52, and each second through hole 521 is communicated with the second control oil port 602 of the directional valve 6 through the second oil passage 12 on the valve body 1.
In the above implementation, the second through hole 521 is used for communicating with the second control oil port 602 of the directional valve.
Illustratively, the second oil passage 12 includes a first orifice 121 and a second orifice 122, one end of the first orifice 121 communicates with the second control oil port 602 of the directional valve 6, an intermediate section of the first orifice 121 communicates with one end of the second orifice 122, and the other end of the second orifice 122 communicates with the second through hole 521.
Illustratively, the peripheral wall of the middle section 52 is provided with a second inner groove 520, each second through hole 521 is communicated with the second inner groove 520, and the other end of the second hole passage 122 is communicated with the second inner groove 520.
In the above implementation, the second inner tank 520 may collect the hydraulic fluid flowing out of each of the second through holes 521 in the middle section 52 in the second inner tank 520, and then communicate the hydraulic fluid in the second inner tank 520 with the second control oil port 602 of the directional valve 6 through the second port 122 and the first port 121. That is, the second control oil port 602 of the directional valve 6 can be conveniently communicated with the interior of the intermediate section 52 by the mutual engagement of the first inner tank 510 and the second oil passage 12.
Alternatively, the working oil port 603 of the directional valve 6 communicates with the main control oil port 103 of the valve body through the third oil passage 13.
Fig. 2 is a longitudinal cross-sectional view of the third oil passage provided in the embodiment of the present disclosure, and in conjunction with fig. 2, the third oil passage 13 includes a first control oil passage 131, a second control oil passage 132, and a third control oil passage 133 (see fig. 5), the first control oil passage 131 and the second control oil passage 132 are arranged perpendicular to each other, one end of the first control oil passage 131 is communicated with the main control oil port 103, and the other end of the first control oil passage 131 is communicated with the second control oil passage 132.
Fig. 5 is a transverse cross-sectional view of a directional valve according to an embodiment of the present disclosure, and in conjunction with fig. 5, one end of the third control oil passage 133 is communicated with the second control oil passage 132, and the other end of the third control oil passage 133 is communicated with the second control oil port 602 of the directional valve.
In this embodiment, when the pressure difference between the pressure of the first control port 601 of the directional valve and the pressure of the second control port 602 of the directional valve is smaller than the set threshold of the directional valve 6, the first control port 601 of the directional valve, the working port 603 of the directional valve, and the second control port 602 of the directional valve are disconnected from each other. When the pressure difference between the pressure of the first control port 601 of the directional valve and the pressure of the second control port 602 of the directional valve is greater than the set threshold of the directional valve 6, the spool of the directional valve 6 moves, and the second control port 602 of the directional valve communicates with the working port 603 of the directional valve.
In this embodiment, the pressure p of the medium diameter section 511 in the inlet section 51 of the hydraulic oil as it passes through the venturi 51Pressure p against intermediate section 522The difference between them is:
Figure BDA0002434739470000101
in the formula: d1、d2The inner diameters of the equal-diameter section 511 and the middle section 52, respectively; rho is the hydraulic oil density, q is openThe flow of hydraulic oil passing through the venturi tube;
from the above equation, the larger the flow rate is, the larger the pressure difference between the equal diameter section 511 and the middle section 52 in the inlet section 51 is, and when the flow rate exceeds the limit value, the pressure difference exceeds the set threshold of the directional valve 6, and the directional valve 6 is reversed. Because the pressure in the diameter section 511 in the inlet section 51 is equal to the pressure of the control oil, and the pressure of the middle section 52 is lower than the pressure of the inlet section 51, that is, lower than the pressure of the control oil, the control oil enters the middle section 52 through the working oil port 603 of the directional valve 6, the second control oil port 602 of the directional valve, the first hole 121 and the second hole 122 of the valve body 1, and the second through hole 521 of the middle section 52 of the venturi tube 5, the pressure of the control oil drops, the valve core 4 moves towards the sealing end thereof, and the flow rate drops, thereby achieving the purpose of limiting the flow rate.
Optionally, a fourth sealing member 84 and a fifth sealing member 85 are arranged on the outer wall of the venturi tube 5, the fourth sealing member 84 and the fifth sealing member 85 are both clamped between the valve body 1 and the venturi tube 5, the fourth sealing member 84 is axially arranged between the first through hole 513 and the second through hole 521, and the fifth sealing member 85 is axially arranged on the side of the second through hole 521 close to the outlet section 53.
In the above implementation, the fourth seal 84 mainly functions to prevent oil in the first through hole 513 of the inlet section 51 of the venturi tube 5 from leaking into the second through hole 521 of the intermediate section 52. The fifth sealing member 85 mainly functions to prevent oil in the second through hole 521 of the intermediate section 52 of the venturi tube 5 from leaking into the communication oil port 104 of the valve body 1.
Fig. 6 is a first longitudinal cross-sectional view of the overflow valve provided in the embodiment of the present disclosure, and with reference to fig. 6, optionally, the hydraulic control valve set further includes an overflow valve 7, the overflow valve 7 is installed on the valve body 1, a control oil port 701 of the overflow valve is communicated with the main control oil port 103, and a working oil port 702 of the overflow valve is communicated with the communication oil port 104.
In the above implementation, the overflow valve 7 is mainly used for auxiliary adjustment of the hydraulic control valve group, and the control oil pressure is overflowed into the main oil return port 102 through the communication oil port 104.
Illustratively, the overflow valve 7 is a manual adjustment direct-acting overflow valve, the overflow valve 7 is inserted in the valve body 1 in a threaded manner, a control oil port 701 of the overflow valve 7 is communicated with the main control oil port 103 through a fourth oil duct 14 on the valve body 1, and a working oil port 702 of the overflow valve 7 is communicated with the communication oil port 104 through a fifth oil duct 15 on the valve body 1.
Fig. 7 is a longitudinal cross-sectional view of the fourth oil passage provided in the embodiment of the disclosure, and in conjunction with fig. 7, for example, the fourth oil passage 14 includes a first overflow passage 141 and a second overflow passage 142, one end of the first overflow passage 141 is communicated with the second control oil passage 132, the other end of the first overflow passage 141 is communicated with one end of the second overflow passage 142, and the other end of the second overflow passage 142 is communicated with the control oil port 701 of the overflow valve 7.
In the above implementation manner, the control oil port 701 of the overflow valve 7 can be effectively communicated with the main control oil port 103 through the above arrangement.
In this embodiment, the fourth oil passage 14 further includes a third overflow passage and a fourth overflow passage, the third overflow passage may be the same passage as the first control oil passage 131, and the fourth overflow passage may be the same passage as the second control oil passage 132.
Fig. 8 is a second longitudinal cross-sectional view of the overflow valve provided in the embodiment of the present disclosure, and with reference to fig. 8, optionally, the fifth oil passage 15 includes a first overflow hole 151, a second overflow hole 152, and a third overflow hole 153, one end of the first overflow hole 151 is communicated with the communication oil port 104, the other end of the first overflow hole 151 is communicated with the second overflow hole 152, the second overflow hole 152 is communicated with one end of the third overflow hole 153, and the other end of the third overflow hole 153 is communicated with the working oil port 702 of the overflow valve 7.
In the above implementation manner, the working oil port 702 of the overflow valve 7 can be effectively communicated with the communication oil port 104 by the above arrangement.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims (10)

1. A hydraulic control valve group comprises a valve body (1) and a valve cover (2) installed at one end of the valve body (1), wherein a main oil inlet (101), a main oil return port (102), a main control oil port (103) and a communication oil port (104) are formed in the valve body (1), and the hydraulic control valve group is characterized by further comprising a valve sleeve (3), a valve core (4), a Venturi tube (5) and a directional valve (6), wherein the communication oil port (104) is communicated with the main oil return port (102);
the valve sleeve (3) is fixedly inserted into the valve body (1), a control hole (31) is formed in the valve sleeve (3), and the control hole (31) is communicated with the main oil inlet (101);
the valve core (4) is slidably mounted in the valve sleeve (3), a pressure reducing hole (41) is formed in the valve core (4), one end of the valve core (4) is sealed and is arranged towards the valve cover (2) to form a control cavity (40), the control cavity (40) is communicated with the main control oil port (103), and an opening (42) for communicating the pressure reducing hole (41) with the Venturi tube (5) is formed in the other end of the valve core (4);
the Venturi tube (5) is fixedly inserted into the valve body (1), the Venturi tube (5) comprises an inlet section (51), a middle section (52) and an outlet section (53) which extend back to the valve cover (2) in sequence, the outer wall of one end of the inlet section (51) is in sealing fit with the inner wall of the valve body (1), one end of the inlet section (51) is communicated with the opening (42) of the valve core (4), and the middle section (52) is communicated with the other end of the inlet section (51) and one end of the outlet section (53) respectively;
the directional valve (6) is fixedly installed on the valve body (1), a first control oil port (601) of the directional valve (6) is communicated with the inlet section (51), a second control oil port (602) of the directional valve (6) is communicated with the middle section (52), a working oil port (603) of the directional valve (6) is communicated with the control cavity (40), and when an oil pressure difference value between the first control oil port (601) and the second control oil port (602) is larger than a set threshold value of the directional valve (6), the working oil port (603) is communicated with the second control oil port (602).
2. The hydraulic control valve group according to claim 1, wherein the inlet section (51) comprises a constant diameter section (511) and a converging section (512), one end of the constant diameter section (511) communicates with the opening (42) of the spool (4), the other end of the constant diameter section (511) communicates with the converging section (512), the inner diameter of the converging section (512) is gradually reduced from one end communicating with the constant diameter section (511) to the other end, and the intermediate section (52) communicates with the other end of the converging section (512).
3. The set of hydraulic control valves according to claim 2, wherein the constant diameter section (511) is provided with a plurality of first through holes (513) on a peripheral wall thereof, and each of the first through holes (513) is communicated with the first control oil port (601) of the directional valve (6) through a first oil passage (11) on the valve body (1).
4. The set of hydraulic control valves according to claim 3, wherein a plurality of second through holes (521) are provided on a peripheral wall of the intermediate section (52), and each second through hole (521) is communicated with the second control oil port (602) of the directional valve (6) through a second oil passage (12) on the valve body (1).
5. A set according to any of claims 1 to 4, characterized in that the valve cover (2) is of a disc-shaped configuration, the end of the valve cover (2) facing the valve body (1) being provided with a circular hole (20), the end of the valve sleeve (3) being housed in the circular hole (20) to constitute the control chamber (40).
6. The hydraulic control valve group according to any one of claims 1 to 4, wherein a first axial hole (21), a second axial hole (22) and a radial hole (23) are arranged in the valve cover (2), the first axial hole (21) is communicated with the main control oil port (103), the second axial hole (22) is communicated with the control cavity (40), and the radial hole (23) is respectively communicated with the first axial hole (21) and the second axial hole (22).
7. The set according to any of claims 1 to 4, wherein the control orifice (31) is a long orifice, the control orifice (31) having a length direction identical to the direction of movement of the spool (4).
8. Hydraulic control valve group according to any of the claims 1 to 4, characterized in that the valve sleeve (3) is a cylindrical structure with two open ends, the inner wall of the valve sleeve (3) near the end of the Venturi tube (5) is provided with a support boss (32), the support boss (32) is arranged opposite to the end of the valve core (4) near the Venturi tube (5).
9. The set according to any one of claims 1 to 4, wherein a first sealing member (81), a second sealing member (82) and a third sealing member (83) are spaced apart from the outer peripheral wall of the valve housing (3), the first sealing member (81) is interposed between the valve housing (3) and the valve cover (2), the second sealing member (82) and the third sealing member (83) are interposed between the valve housing (3) and the valve body (1), and the control hole (31) is located between the second sealing member (82) and the third sealing member (83).
10. The group of hydraulic control valves according to claim 4, characterized in that a fourth seal (84) and a fifth seal (85) are provided on the outer wall of the venturi tube (5), the fourth seal (84) and the fifth seal (85) are both interposed between the valve body (1) and the venturi tube (5), the fourth seal (84) is axially disposed between the first through hole (513) and the second through hole (521), and the fifth seal (85) is axially disposed on the side of the second through hole (521) close to the outlet section (53).
CN202010248736.6A 2020-04-01 2020-04-01 Hydraulic control valve group Pending CN111577690A (en)

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CN114367551B (en) * 2020-10-15 2024-03-26 北京京诚瑞信长材工程技术有限公司 Water diversion valve group and multichannel water cooling device for long-material excellent special steel production line

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Application publication date: 20200825