CN110553081B - Hydraulic reversing valve and hydraulic reversing device - Google Patents

Hydraulic reversing valve and hydraulic reversing device Download PDF

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Publication number
CN110553081B
CN110553081B CN201910935773.1A CN201910935773A CN110553081B CN 110553081 B CN110553081 B CN 110553081B CN 201910935773 A CN201910935773 A CN 201910935773A CN 110553081 B CN110553081 B CN 110553081B
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CN
China
Prior art keywords
valve
liquid passing
oil
groove
hydraulic reversing
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Active
Application number
CN201910935773.1A
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Chinese (zh)
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CN110553081A (en
Inventor
陈剑
满延范
周金跃
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Shanghai Yigong Hydrogen Technology Co ltd
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Shanghai Yigong Hydrogen Technology Co ltd
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Priority to CN201910935773.1A priority Critical patent/CN110553081B/en
Publication of CN110553081A publication Critical patent/CN110553081A/en
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Classifications

    • 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
    • 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
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
    • F16K11/085—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug
    • F16K11/0856—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug having all the connecting conduits situated in more than one plane perpendicular to the axis of the plug
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
    • F16K27/065—Construction of housing; Use of materials therefor of taps or cocks with cylindrical plugs
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Multiple-Way Valves (AREA)

Abstract

The application provides a hydraulic reversing valve and a hydraulic reversing device, and relates to the technical field of reversing valves. The hydraulic reversing valve comprises a valve body, a valve sleeve and a valve core. The valve body is provided with a first installation cavity, the valve body further comprises a pressure oil port, an oil return port, a first working port and a second working port which are communicated with the first installation cavity, and the valve sleeve is arranged in the first installation cavity. The valve sleeve is provided with a second installation cavity, a plurality of oil ditches are formed in the circumferential direction of the valve sleeve, and all the oil ditches are provided with liquid passing holes communicated with the second installation cavity. The valve core comprises a first liquid passing groove and a second liquid passing groove which are distributed along the axial direction, and the valve core is rotatably arranged in the second mounting chamber. The hydraulic reversing valve can meet the use requirements of high reversing frequency and high working pressure of the actuating mechanism of some equipment by means of the combination of the body, the valve sleeve and the valve core and the cooperation of the liquid passing groove and the liquid passing hole in the oil groove and the clearance seal between the valve core and the valve sleeve. The hydraulic reversing valve and the driving mechanism form a hydraulic reversing device, so that the use requirements can be met.

Description

Hydraulic reversing valve and hydraulic reversing device
Technical Field
The application relates to the technical field of reversing valves, in particular to a hydraulic reversing valve and a hydraulic reversing device.
Background
In the field of hydraulic engineering, reversing valves are widely used.
The reversing frequency of an actuating mechanism of some equipment is high, and the existing spool valve type reversing valve is low in reversing frequency due to inertia, so that the high-frequency reversing operation requirement of the equipment cannot be met.
Disclosure of Invention
The application aims to provide a hydraulic reversing valve which can meet the working environment with high pressure and the working requirement of high reversing frequency.
Another object of the present application is to provide a hydraulic reversing device comprising the above hydraulic reversing valve, which is also capable of meeting the working environment of high pressure and the working requirements of high reversing frequency.
Embodiments of the present application are implemented as follows:
an embodiment of the present application provides a hydraulic directional valve including: the valve comprises a valve body, a valve sleeve and a valve core;
The valve body further comprises a pressure oil port, an oil return port, a first working port and a second working port which are communicated with the first mounting cavity, and the valve sleeve is arranged in the first mounting cavity;
The valve sleeve is internally provided with a second installation cavity, a plurality of oil ditches are formed in the circumferential direction of the valve sleeve, the oil ditches are respectively provided with a liquid passing hole communicated with the second installation cavity, and the oil ditches are divided into a pressure oil ditch communicated with the pressure oil port, a switching oil ditch communicated with the working port and an oil return ditch communicated with the oil return port;
the valve core comprises a first liquid passing groove and a second liquid passing groove which are distributed along the axial direction, and the valve core is rotatably arranged in the second mounting cavity;
when the first liquid passing groove is in place, the pressure oil groove is communicated with the first working port through a part of the switching oil groove, the second liquid passing groove is communicated with the second working port through another switching oil groove at the same time, and the valve core is rotated, so that the first liquid passing groove and the second liquid passing groove are alternately in place.
The valve core is driven to rotate in the valve sleeve, the liquid passing groove of the valve core is matched with the oil groove of the valve sleeve, in the rotating process, the pressure oil groove is communicated with the first working port, the oil returning groove is communicated with the second working port, and then the valve core is alternately rotated, and the high-frequency circulating reversing is realized in the rotating process of the valve core.
In addition, the hydraulic reversing valve provided by the embodiment of the application can also have the following additional technical characteristics:
in an alternative embodiment of the application, the valve element is gap-sealed with the valve sleeve.
The valve core can be rotatably arranged on the valve sleeve and is also in clearance seal with the valve sleeve, so that the valve core can adapt to the working environment with high pressure.
In an alternative embodiment of the application, the two end parts and the middle part of the inner wall of the valve sleeve respectively form a clearance sealing ring with the length of 15-20mm and the fit clearance of 2-30 μm with the valve core, and the two clearance sealing rings positioned at the two end parts of the inner wall of the valve sleeve are mutually symmetrical.
The clearance sealing ring formed by the design can reduce the design difficulty of rotary sealing, and the symmetrical structural design can reduce unbalanced load caused by different working medium pressures.
In an alternative embodiment of the application, the valve sleeve comprises sealing grooves, adjacent oil grooves are separated by the sealing grooves, and sealing rings are arranged in the sealing grooves.
And a sealing ring is arranged in the sealing groove and can be matched with the cavity wall of the first installation cavity of the valve body, so that the medium between the oil grooves is sealed, and medium communication between the oil grooves is avoided.
In an alternative embodiment of the present application, a section of a middle position of the pressure oil groove is taken as a reference surface, one side of the reference surface of the plurality of liquid passing holes in the pressure oil groove is a first liquid passing auxiliary hole, and the other side of the reference surface is a second liquid passing auxiliary hole; wherein the switching oil groove on one side is communicated with the first working port, and the switching oil groove on the other side is communicated with the second working port; wherein the oil return groove on one side is communicated with one oil return port, and the oil return groove on the other side is communicated with the other oil return port;
the first liquid passing groove and the second liquid passing groove are staggered in the radial direction, the first liquid passing groove can be used for communicating the first liquid passing auxiliary hole with the liquid passing hole of the switching oil groove on one side of the reference surface, and the second liquid passing groove can be used for communicating the liquid passing hole of the switching oil groove on the other side of the reference surface with the liquid passing hole of the oil returning groove; or, the first liquid passing groove can communicate the liquid passing hole of the switching oil groove at one side of the reference surface with the liquid passing hole of the oil return groove, and the second liquid passing groove can communicate the second liquid passing auxiliary hole with the liquid passing hole of the switching oil groove at the other side of the reference surface.
The two oil return grooves are respectively arranged on two sides of the pressure oil groove, oil return can be alternately carried out, and the structure layout is symmetrical and practical.
In an alternative embodiment of the present application, the valve sleeve has a cylinder structure, and in an axial direction of the valve sleeve, the first auxiliary liquid passing hole and the second auxiliary liquid passing hole are opposite to a part of the liquid passing holes in the switching oil gallery; and the liquid through holes in the other part of the switching oil ditch are opposite to the liquid through holes in the oil return ditch.
The valve housing of the cylinder structure can be conveniently arranged in the valve body, the position distribution of the liquid passing holes can be matched with the liquid passing grooves, the liquid passing grooves are formed in the valve housing, the valve housing is not required to be bent, other quantity of liquid passing grooves are conveniently formed in the valve core, and other quantity of liquid passing holes are formed in the valve housing.
In an alternative embodiment of the present application, the number of the first auxiliary liquid passing holes and the second auxiliary liquid passing holes are two, the two auxiliary liquid passing holes are 180 ° apart from each other in the circumferential direction of the valve sleeve, the number of the liquid passing holes in the single oil switching groove is four and 90 ° apart from each other in the circumferential direction of the valve sleeve, and the number of the liquid passing holes in the single oil return groove is two and 180 ° apart from each other in the circumferential direction of the valve sleeve;
The number of the first liquid passing grooves is two and are symmetrically distributed in the radial direction of the valve core, the number of the second liquid passing grooves is two and are symmetrically distributed in the radial direction of the valve core, and the first liquid passing grooves and the second liquid passing grooves are staggered by 90 degrees in the radial direction.
Furthermore, the position design of the liquid passing groove and the design of the liquid passing hole can enable the valve core to rotate 180 degrees to complete one-time working cycle, and the reversing efficiency is high.
In an alternative embodiment of the present application, the hydraulic reversing valve further includes a first cover plate and a second cover plate, the first cover plate and the second cover plate are respectively connected to opposite sides of the valve body, the first cover plate covers one end of the valve core, and the other end of the valve core passes through the second cover plate;
An oil liquid collecting cavity is formed between the first cover plate and the valve body, the first cover plate is provided with an oil collecting hole, the first cover plate can be connected with an oil tank at the oil collecting hole, and the position of the oil collecting hole deviates from the axis of the valve core in the axial direction of the valve core;
And a sealing cavity is formed between the second cover plate and the valve body and is used for collecting the hydraulic oil leaked from the inside.
Through setting up fluid collection chamber, can collect the working medium that leaks and flow back to the oil tank through collecting the oilhole. And the sealed chamber is also able to collect the leaked working medium.
In an alternative embodiment of the present application, the valve body further includes a limiting boss protruding from a cavity wall of the first installation cavity, a positioning screw hole for passing through a positioning screw is formed on the limiting boss, and the hydraulic reversing valve further includes a limiting ring;
One end of the valve sleeve is propped against the limiting boss and is limited to rotate by the positioning screw, and the other end of the valve sleeve is propped against the limiting ring and is limited to slide.
Through spacing boss and spacing ring, can make the valve pocket be restrained in the valve body in the axial, combine the locating screw again, can be in the rotation of circumference restriction valve pocket.
The embodiment of the application provides a hydraulic reversing device, which comprises a driving mechanism and the hydraulic reversing valve, wherein the output end of the driving mechanism is connected with the valve core of the hydraulic reversing valve and can drive the valve core to rotate.
The hydraulic reversing device drives the hydraulic reversing valve through the driving mechanism, so that the reversing can be performed at high frequency, and the use requirement is met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of a hydraulic reversing valve provided by an embodiment of the present application;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a cross-sectional view of the valve body;
FIG. 4 is a schematic illustration of a valve sleeve;
FIG. 5 is a cross-sectional view of FIG. 4;
FIG. 6 is a perspective view of the valve cartridge;
Fig. 7 is a schematic view of a valve cartridge.
Icon: 100-a hydraulic reversing valve; 10-a valve body; 11-a pressure oil port; 12-an oil return port; 13-a first work port; 14-a second work port; 15-limiting bosses; 20-valve sleeve; 21-a pressure oil gallery; 22-switching oil grooves; 23-oil return grooves; 24-sealing the ditch; 25-liquid passing holes; 30-valve core; 31-a first liquid passing tank; 32-a second liquid passing trough; 40-sealing rings; 50-deep groove ball bearings; 51-bearing lock nut; 52-pressing the outer ring of the bearing; 60-positioning screws; 70-limiting rings; 80-a first cover plate; 90-a second cover plate; 101-an oil liquid collecting cavity; 102-collecting oil holes; 103-sealing the cavity; 104-rotating an oil seal; 105-snap springs.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that the product is conventionally put in use, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Examples
Referring to fig. 1 to 7, the present embodiment provides a hydraulic reversing valve 100, which includes: a valve body 10, a valve housing 20 and a valve core 30;
the valve body 10 is internally provided with a first installation cavity, the valve body 10 further comprises a pressure oil port 11, an oil return port 12, a first working port 13 and a second working port 14 which are communicated with the first installation cavity, and a valve sleeve 20 is arranged in the first installation cavity;
The valve sleeve 20 is internally provided with a second installation cavity, a plurality of oil grooves are formed in the circumferential direction of the valve sleeve 20, each oil groove is provided with a liquid passing hole 25 communicated with the second installation cavity, and each oil groove is divided into a pressure oil groove 21 communicated with the pressure oil port 11, a switching oil groove 22 communicated with the working port and an oil return groove 23 communicated with the oil return port 12;
The valve core 30 comprises a first liquid passing groove 31 and a second liquid passing groove 32 which are distributed along the axial direction, and the valve core 30 is rotatably arranged in the second mounting chamber;
When the first liquid passing groove 31 is in place, the pressure oil groove 21 can be communicated with the first working port 13 through the partial switching oil groove 22 (namely, a liquid passing channel is formed), the second liquid passing groove 32 can simultaneously enable the oil return groove 23 to be communicated with the second working port 14 through the other switching oil groove 22 (namely, a liquid passing channel is formed), and the valve core 30 is rotated, so that the first liquid passing groove 31 and the second liquid passing groove 32 can be alternately in place. This way commutation can be accomplished by alternating working channels.
Wherein, the work port is used for connecting actuating mechanism.
In this embodiment, the valve element 30 is sealed in a gap with the valve sleeve 20. The valve core 30 is driven by a motor to rotate at a high speed in the valve sleeve 20 according to task requirements, oil generates an oil film in a gap between the valve core 30 and the valve sleeve 20, and dynamic sealing is achieved. The hydraulic directional control valve 100 of the present embodiment can normally operate under high pressure, and through practice, the operating pressure can be greater than 45MPa, and the operating pressure of a common sliding valve type directional control valve is generally less than 35MPa, so that the hydraulic directional control valve 100 of the present application has better effect than a common directional control valve. In addition, because of the oil film, the valve core 30 and the valve sleeve 20 are not contacted and almost have no abrasion, so that not only can an effective seal be formed (the leakage amount is in an acceptable range), but also the service life of the product can be greatly prolonged.
The valve core 30 is driven to rotate in the valve sleeve 20, the liquid passing groove of the valve core 30 is matched with the oil groove of the valve sleeve 20, the pressure oil groove 21 is communicated with the first working port 13, the oil returning groove 23 is communicated with the second working port 14 in the rotating process, and then the valve core 30 is alternately rotated, and high-frequency circulating reversing is realized in the rotating process of the valve core 30. Since the valve body 30 is rotatably provided not only to the valve housing 20 but also in clearance-sealing with the valve housing 20, it is possible to adapt to a high-pressure working environment.
Specifically, in this embodiment, the two end portions and the middle portion of the inner wall of the valve housing 20 form clearance seal rings with a length of 15-20mm and a fit clearance of 2-30 μm with the valve core 30, respectively, and the two clearance seal rings located at the two end portions of the inner wall of the valve housing 20 are located symmetrically to each other. The location M of the clearance seal ring is shown in fig. 5.
Considering that high and low pressure working media act on axially different positions of the spool 30, a certain degree of unbalanced load is caused. The clearance sealing ring formed by the design can reduce the design difficulty of the rotary seal, because the pressure is greatly reduced after the small leakage amount allowed by the clearance seal passes through the clearance sealing rings at the two ends. And the symmetrical structural design can reduce unbalanced load caused by different working medium pressures.
Referring to fig. 4 and 5, in particular, in the present embodiment, the valve sleeve 20 includes a sealing groove 24, adjacent oil grooves are separated by the sealing groove 24, and a sealing ring 40 is disposed in the sealing groove 24. A sealing ring 40 is installed in the sealing groove 24, and the sealing ring 40 can be matched with the cavity wall of the first installation cavity of the valve body 10, so that media between the oil grooves are sealed, and medium communication between the oil grooves is avoided.
More specifically, the cross section of the middle part of the pressure oil groove 21 is taken as a reference surface H, among the plurality of liquid passing holes 25 in the pressure oil groove 21, one side of the reference surface is a first liquid passing auxiliary hole, and the other side of the reference surface is a second liquid passing auxiliary hole; one side of the switching oil groove 22 is communicated with the first working port 13, and the other side of the switching oil groove 22 is communicated with the second working port 14; one side of the oil return groove 23 is communicated with one oil return port 12, and the other side of the oil return groove 23 is communicated with the other oil return port 12;
The first liquid passing groove 31 and the second liquid passing groove 32 are staggered in the radial direction, the first liquid passing groove 31 can communicate the first liquid passing auxiliary hole with the liquid passing hole 25 of the switching oil groove 22 on one side of the reference surface, and the second liquid passing groove 32 can communicate the liquid passing hole 25 of the switching oil groove 22 on the other side of the reference surface with the liquid passing hole 25 of the oil returning groove 23; alternatively, the first liquid passing groove 31 may communicate the liquid passing hole 25 of the switching oil groove 22 on one side of the reference surface with the liquid passing hole 25 of the oil returning groove 23, and the second liquid passing groove 32 may communicate the second liquid passing sub-hole with the liquid passing hole 25 of the switching oil groove 22 on the other side of the reference surface. The two oil return grooves 23 are arranged on both sides of the pressure oil groove 21, so that oil return can be performed alternately, and the structure layout is symmetrical and practical.
In this embodiment, the valve sleeve 20 has a cylindrical structure, and in the axial direction of the valve sleeve 20, the first liquid-passing auxiliary hole and the second liquid-passing auxiliary hole are opposite to the positions of part of the liquid-passing holes 25 in the switching oil groove 22; the other part of the liquid passing holes 25 in the switching oil groove 22 are opposite to the positions of the liquid passing holes 25 in the oil returning groove 23. The valve housing 20 with the barrel-shaped structure can be conveniently installed into the valve body 10, the position distribution of the liquid passing holes 25 can be matched with the liquid passing grooves, the opening of the liquid passing grooves can be determined according to the position distribution, the valve housing 30 is conveniently opened with other liquid passing grooves, and the valve housing 20 is conveniently opened with other liquid passing holes 25. Of course, if other requirements exist, the liquid passing groove can be bent and opened according to the requirements, and the corresponding liquid passing holes 25 can be arranged according to the bending mode of the liquid passing groove.
Referring to fig. 2 and 3, in the present embodiment, the valve core 30 is installed in the valve body 10 through a bearing, and in the present embodiment, a deep groove ball bearing 50 is adopted, an outer ring is installed in the valve body 10, and an inner ring is sleeved on the valve core 30. And is provided with a snap spring 105 to prevent axial play between the bearing and the spool 30. Further, a bearing lock nut 51 is provided to lock the inner ring and the valve element 30, and a bearing outer ring pressing sleeve 52 is provided to lock the outer ring and the valve body 10.
The valve body 10 further comprises a limiting boss 15, the limiting boss 15 protrudes out of the cavity wall of the first installation cavity, a positioning screw hole for penetrating the positioning screw 60 is formed in the limiting boss 15, and the hydraulic reversing valve 100 further comprises a limiting ring 70;
One end of the valve sleeve 20 is abutted against the limit boss 15 and limited to rotate by the set screw 60, and the other end of the valve sleeve 20 is abutted against and limited to slide by the limit ring 70. The valve sleeve 20 can be limited in the axial direction in the valve body 10 by the limiting boss 15 and the limiting ring 70, and the rotation of the valve sleeve 20 can be limited in the circumferential direction by combining the positioning screw 60.
Alternatively, in addition to the valve sleeve 20 of the cylinder structure provided in the present embodiment, it is also conceivable to design the outer shape of the valve sleeve 20 into a three-dimensional shape, and the corresponding oil grooves, the liquid passing holes 25, etc. may be opened according to the corresponding structures opened on the valve sleeve 20 of the cylinder structure, so that the functions of these structures are normally performed. The valve sleeve 20 with a cubic shape is embedded in the valve body 10, so that rotation can be avoided.
Referring to fig. 2 again, in the present embodiment, the hydraulic reversing valve 100 further includes a first cover plate 80 and a second cover plate 90, the first cover plate 80 and the second cover plate 90 are respectively connected to opposite sides of the valve body 10, the first cover plate 80 covers one end of the valve core 30, and the other end of the valve core 30 passes through the second cover plate 90; an oil collecting cavity 101 is formed between the first cover plate 80 and the valve body 10, the first cover plate 80 is provided with an oil collecting hole 102, and the first cover plate 80 can be connected with an oil tank through a connecting pipeline at the oil collecting hole 102. The position of the collecting oil hole 102 deviates from the axial center of the valve core 30 in the axial direction of the valve core 30, so that the hydraulic oil overflowed by the rotation of the valve core 30 can be prevented from being directly splashed out from the collecting oil hole 102. A sealing cavity 103 is formed between the second cover plate 90 and the valve body 10, and is used for collecting the hydraulic oil leaked from the inside, and a rotary oil 104 is arranged between the valve core 30 and the second cover plate 90, so as to avoid the leakage of working media such as the hydraulic oil. By providing the oil collecting chamber 101, the leaked working medium can be collected and returned to the oil tank through the collecting oil hole 102. And the sealed chamber 103 is also able to collect the leaked working medium.
The principle of this embodiment is:
The traditional slide valve type reversing valve utilizes electromagnetic force to drive the valve core to do reciprocating linear motion so as to realize reversing. The traditional slide valve type reversing valve is characterized in that: the working pressure is not high (generally less than 35 MPa), the reversing frequency is unstable (after long-time working, the reversing frequency is deviated due to the heating of a coil), the sealing element is easy to wear and cause leakage after long-time working, and the service life is not long (the service life of civil products is generally tens of thousands of times at most). In order to meet the use requirements of high reversing frequency and high working pressure of the actuating mechanism of some devices, the present embodiment provides a hydraulic reversing valve 100, which is specifically as follows:
It is contemplated that the configuration of the fluid passage grooves of the valve core 30 and the configuration of the fluid passage holes 25 of the valve sleeve 20 and the mating relationship therebetween, as well as the number of fluid passage grooves and fluid passage holes 25, and the number of fluid passage channels formed by the grooves and holes, may be determined according to actual functions.
In detail, in the present embodiment, the number of the first auxiliary liquid passing holes and the second auxiliary liquid passing holes is two, the two first auxiliary liquid passing holes are spaced 180 ° from each other in the circumferential direction of the valve sleeve 20, the two second auxiliary liquid passing holes are spaced 180 ° from each other in the circumferential direction of the valve sleeve 20, the number of the liquid passing holes 25 in the single switching oil gallery 22 is four and spaced 90 ° from each other in the circumferential direction of the valve sleeve 20, and the number of the liquid passing holes 25 in the single oil return gallery 23 is two and spaced 180 ° from each other in the circumferential direction of the valve sleeve 20;
As shown in fig. 6 and 7, the first liquid passing grooves 31 are two in number and symmetrically distributed in the radial direction of the valve core 30, the second liquid passing grooves 32 are two in number and symmetrically distributed in the radial direction of the valve core 30, and the first liquid passing grooves 31 and the second liquid passing grooves 32 are staggered by 90 ° in the radial direction.
In more detail, the pressure oil port 11 is a P port, the two oil return ports 12 are a T1 port and a T2 port, the first working port 13 is an a port, and the second working port 14 is a B port. Taking the design of the liquid passing groove and the liquid passing hole 25 as an example, as the valve core 30 rotates 90 degrees, one of the working ports A and P (or T1) is connected, the other working port B and T2 (or P) is connected, and the valve core 30 rotates 180 degrees to complete one working cycle. Further, when the spool 30 is not rotated, the port P communicates with the working port B, and the high-pressure working medium flows into the hydraulic actuator (i.e., actuator), and at the same time, the return oil of the hydraulic actuator passes through the other working port a and then returns to the tank through the port T1. When the valve core 30 rotates 90 degrees, the port P is communicated with the working port A, high-pressure working medium flows into the hydraulic actuating element, and meanwhile, oil return of the hydraulic actuating element passes through the other working port B and then returns to the oil tank through the port T2. When the valve core 30 rotates to 180 °, the two first liquid passing grooves 31 and the two second liquid passing grooves 32 on the valve core 30 are symmetrical, and the positional relationship between the valve core 30 and the valve sleeve 20 returns to the state when the valve core 30 is not rotated. Thus, the liquid passing channel of the liquid inlet and the liquid passing channel of the oil return are switched on, one reversing action is completed, and the reversing of the actuating mechanism is realized.
In general, the requirements of the position design and the mating relationship of the fluid passing grooves and the fluid passing holes 25 are that the spacing arc length between the fluid passing grooves of the valve core 30 and the spacing arc length between the fluid passing holes 25 of the valve sleeve 20 are the same as the corresponding arc length on the mating circumference. By taking the above angle design as an example, after corresponding design requirements are met, the valve core 30 can be rotated 180 degrees to complete one-time reversing, and the reversing efficiency is high. After increasing the number of liquid passing grooves and corresponding liquid passing holes 25, the valve core 30 can complete one reversing cycle under the condition of rotating by a smaller angle; after reducing the number of fluid passages and corresponding fluid passages 25, the spool 30 may complete a reversing cycle with a greater degree of rotation. Of course, instead of changing the number of fluid passages in the circumferential direction of the spool 30, the number of corresponding oil grooves and fluid passages 25 may be changed and arranged in the axial direction to accommodate a different number of working ports. The number of the liquid passing grooves and the corresponding liquid passing holes 25 can be determined according to actual requirements.
In addition to varying the number of fluid channels and fluid holes 25, the rotational speed of the external drive mechanism may be configured according to the commutation frequency requirements. For example, the embodiment of the application also provides a hydraulic reversing device, which comprises a driving mechanism and a hydraulic reversing valve 100, wherein the output end of the driving mechanism is connected with the valve core 30 of the hydraulic reversing valve 100 and can drive the valve core 30 to rotate. The hydraulic reversing device drives the hydraulic reversing valve 100 through the driving mechanism, and can reverse at high frequency, thereby meeting the use requirement. The driving mechanism may be a driving motor, and the valve core 30 is connected to the driving motor through a coupling.
Because the valve core 30 and the valve sleeve 20 are in clearance seal, when the valve core 30 rotates, clearance seal rings are formed between the middle position and the two symmetrical positions of the valve core 30 and the valve sleeve 20, so that the valve core can adapt to working pressure of 45MPa and higher.
In summary, the hydraulic reversing valve 100 of the present application can meet the use requirements of high reversing frequency and high working pressure of the actuating mechanism of some devices by means of the combination of the valve sleeve 20 and the valve core 30, the cooperation of the liquid passing groove and the liquid passing hole 25 in the oil gallery, and the gap sealing between the valve core 30 and the valve sleeve 20. The hydraulic reversing valve 100 and the driving mechanism form a hydraulic reversing device, so that the use requirement can be met.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (9)

1. A hydraulic reversing valve, comprising: the valve comprises a valve body, a valve sleeve and a valve core;
The valve body further comprises a pressure oil port, an oil return port, a first working port and a second working port which are communicated with the first mounting cavity, and the valve sleeve is arranged in the first mounting cavity;
The valve sleeve is internally provided with a second installation cavity, a plurality of oil ditches are formed in the circumferential direction of the valve sleeve, the oil ditches are respectively provided with a liquid passing hole communicated with the second installation cavity, and the oil ditches are divided into a pressure oil ditch communicated with the pressure oil port, a switching oil ditch communicated with the working port and an oil return ditch communicated with the oil return port;
the valve core comprises a first liquid passing groove and a second liquid passing groove which are distributed along the axial direction, and the valve core is rotatably arranged in the second mounting cavity;
When the first liquid passing groove is in place, the pressure oil groove can be communicated with the first working port through part of the switching oil groove, the second liquid passing groove can be communicated with the second working port through the other switching oil groove at the same time, and the valve core is rotated, so that the first liquid passing groove and the second liquid passing groove can be alternately in place;
taking the section of the middle part of the pressure oil groove as a reference surface, wherein among a plurality of liquid passing holes in the pressure oil groove, one side of the reference surface is a first liquid passing auxiliary hole, and the other side of the reference surface is a second liquid passing auxiliary hole; wherein the switching oil groove on one side is communicated with the first working port, and the switching oil groove on the other side is communicated with the second working port; wherein the oil return groove on one side is communicated with one oil return port, and the oil return groove on the other side is communicated with the other oil return port;
the first liquid passing groove and the second liquid passing groove are staggered in the radial direction, the first liquid passing groove can be used for communicating the first liquid passing auxiliary hole with the liquid passing hole of the switching oil groove on one side of the reference surface, and the second liquid passing groove can be used for communicating the liquid passing hole of the switching oil groove on the other side of the reference surface with the liquid passing hole of the oil returning groove; or, the first liquid passing groove can communicate the liquid passing hole of the switching oil groove at one side of the reference surface with the liquid passing hole of the oil return groove, and the second liquid passing groove can communicate the second liquid passing auxiliary hole with the liquid passing hole of the switching oil groove at the other side of the reference surface.
2. The hydraulic reversing valve of claim 1, wherein the spool is gap-sealed to the valve housing.
3. The hydraulic reversing valve according to claim 2, wherein both end portions and a middle portion of the inner wall of the valve housing form clearance seal rings with a length of 15-20mm and a fit clearance of 2-30 μm with the valve spool, respectively, and positions of the two clearance seal rings at both end portions of the inner wall of the valve housing are symmetrical to each other.
4. The hydraulic reversing valve of claim 1, wherein the valve housing includes a sealing groove, adjacent oil grooves being separated by the sealing groove, and a seal ring being disposed in the sealing groove.
5. The hydraulic reversing valve according to claim 1, wherein the valve sleeve has a cylinder structure, and the first auxiliary liquid passing hole and the second auxiliary liquid passing hole are opposite to the positions of part of liquid passing holes in the switching oil gallery in the axial direction of the valve sleeve; and the liquid through holes in the other part of the switching oil ditch are opposite to the liquid through holes in the oil return ditch.
6. The hydraulic reversing valve of claim 5, wherein the number of the first auxiliary hydraulic passage holes and the second auxiliary hydraulic passage holes are two, the two auxiliary hydraulic passage holes are 180 ° apart from each other in the circumferential direction of the valve housing, the number of the hydraulic passage holes in a single switching oil gallery is four and 90 ° apart from each other in the circumferential direction of the valve housing, and the number of the hydraulic passage holes in a single oil return gallery is two and 180 ° apart from each other in the circumferential direction of the valve housing;
The number of the first liquid passing grooves is two and are symmetrically distributed in the radial direction of the valve core, the number of the second liquid passing grooves is two and are symmetrically distributed in the radial direction of the valve core, and the first liquid passing grooves and the second liquid passing grooves are staggered by 90 degrees in the radial direction.
7. The hydraulic reversing valve of claim 1, further comprising a first cover plate and a second cover plate, the first cover plate and the second cover plate being respectively connected to opposite sides of the valve body, the first cover plate covering one end of the valve spool, the other end of the valve spool passing through the second cover plate;
An oil liquid collecting cavity is formed between the first cover plate and the valve body, the first cover plate is provided with an oil collecting hole, the first cover plate can be connected with an oil tank at the oil collecting hole, and the position of the oil collecting hole deviates from the axis of the valve core in the axial direction of the valve core;
And a sealing cavity is formed between the second cover plate and the valve body and is used for collecting the hydraulic oil leaked from the inside.
8. The hydraulic reversing valve according to claim 1, wherein the valve body further comprises a limiting boss protruding out of a cavity wall of the first mounting cavity, a positioning screw hole for penetrating a positioning screw is formed in the limiting boss, and the hydraulic reversing valve further comprises a limiting ring;
One end of the valve sleeve is propped against the limiting boss and is limited to rotate by the positioning screw, and the other end of the valve sleeve is propped against the limiting ring and is limited to slide.
9. A hydraulic reversing device, characterized by comprising a driving mechanism and the hydraulic reversing valve according to any one of claims 1-8, wherein an output end of the driving mechanism is connected with the valve core of the hydraulic reversing valve and can drive the valve core to rotate.
CN201910935773.1A 2019-09-29 2019-09-29 Hydraulic reversing valve and hydraulic reversing device Active CN110553081B (en)

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