CN112594244A - Mechanical hydraulic control reversing valve - Google Patents
Mechanical hydraulic control reversing valve Download PDFInfo
- Publication number
- CN112594244A CN112594244A CN202011491985.4A CN202011491985A CN112594244A CN 112594244 A CN112594244 A CN 112594244A CN 202011491985 A CN202011491985 A CN 202011491985A CN 112594244 A CN112594244 A CN 112594244A
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- Prior art keywords
- pilot
- main
- valve
- oil
- pilot valve
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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
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- 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
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
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- 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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
Abstract
The invention provides a mechanical hydraulic control reversing valve, which comprises a first adjusting mechanism, a second adjusting mechanism, a pilot valve sleeve, an oil chamber switching mechanism, a main valve core and a main valve sleeve, wherein the first adjusting mechanism and the second adjusting mechanism are respectively arranged at one ends of the pilot valve sleeve and the main valve sleeve, the other end of the pilot valve sleeve is connected with the other end of the main valve sleeve, an installation chamber is formed in the other end of the main valve sleeve, the oil chamber switching mechanism and the main valve core are sequentially arranged in the installation chamber, a first accommodating space, a first pilot chamber, a second accommodating space and a third accommodating space are formed in the installation chamber, the first accommodating space and the third accommodating space are respectively connected with a main oil source, the first pilot chamber and the second accommodating space are respectively connected with an auxiliary oil source, the action area of one side of the pilot valve is changed when the pilot valve is opened and closed, so that the required pressure is different when the pilot valve is opened and closed, the working stability and reliability of the reversing valve are ensured, and the risk that the main valve core stops at a certain position in the middle is avoided.
Description
Technical Field
The invention relates to the field of hydraulic valves and fluid transmission control, in particular to a mechanical hydraulic control reversing valve.
Background
The reversing valve is a directional control valve with more than two flow forms and more than two oil ports. The valve realizes the communication, cut-off and reversal of hydraulic oil flow, pressure unloading and sequential action control. In a hydraulic servo system, when an oil supply source fails and the supply pressure drops significantly, an auxiliary oil supply source is usually provided in order to enable the load to continue operating. Therefore, a reversing device is needed to realize the switching device of the main oil source and the auxiliary oil source. The pilot operated directional control valve is widely used because of its higher reliability compared to the electromagnetic directional control valve. The threaded cartridge type hydraulic valve is widely applied to the existing hydraulic elements and systems because of the advantages of zero leakage, light weight, high integration level, relatively easy processing and modification and the like. Most of the existing reversing valves capable of realizing the functions are two-position three-way reversing valves, and the reversing valves have some defects in design. For example, when the oil pressure of the main oil source fluctuates around the set switching pressure, the pilot valve may be opened and closed frequently, which causes frequent switching and vibration of the main valve, and affects the safety and reliability of the entire valve. In addition, the displacement of the main valve core can change along with the change of the pressure, and the risk that the main valve core stops at a certain position in the middle exists, so that the normal work of the reversing valve is influenced.
In order to solve the problem of switching two paths of energy of a hydraulic system, a plurality of two-position three-way hydraulic control reversing valves are invented, for example, patent document CN209041644U discloses a one-way protection two-position three-way hydraulic control reversing valve to realize the switching of an oil path and solve the problems of high requirement on the strength and large space structure of a large-flow hydraulic control reversing valve return spring, for example, patent document CN111059092A discloses a double-system energy selection valve and an isolation device thereof to realize the switching between two sets of hydraulic systems and simultaneously ensure that the two systems are well isolated before and after the switching, and in addition, Sun also produces a DPBA-LAN two-position three-way hydraulic control reversing valve structure. However, in the above-described design, when the hydraulic pressure of the main oil source fluctuates around the set switching pressure, the main valve is still frequently switched and vibrated. In addition, the displacement of the main spool may also vary with the pressure, with the risk of the main spool stopping somewhere in the middle.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a mechanical hydraulic control reversing valve.
The invention provides a mechanical hydraulic control reversing valve which comprises a first adjusting mechanism, a second adjusting mechanism, a pilot valve sleeve, an oil chamber switching mechanism, a main valve core and a main valve sleeve, wherein the pilot valve sleeve is arranged on the main valve core;
the pilot valve comprises a pilot valve sleeve, a main valve core, an oil chamber switching mechanism, a main valve core, a pilot valve sleeve and a pilot valve sleeve, wherein one end of the pilot valve sleeve is provided with a first adjusting mechanism, one end of the main valve sleeve is provided with a second adjusting mechanism, the other end of the pilot valve sleeve is connected with the other end of the main valve sleeve, and an installation cavity is formed in the pilot valve sleeve;
a pilot valve core is arranged in the oil chamber switching mechanism, the first accommodating space and the third accommodating space are respectively connected with a main oil source, and the first pilot cavity and the second accommodating space are respectively connected with an auxiliary oil source;
when the oil pressure of the main oil source is greater than or equal to a first preset oil pressure, the main valve core moves to a first position, the pilot valve core is in a closed state, and at the moment, the main oil source is connected with a load port arranged on the main valve sleeve through a third accommodating space;
when the oil pressure of the main oil source is smaller than a second preset oil pressure, the pilot valve core moves towards the first adjusting mechanism under the action of the oil pressure of the auxiliary oil source and is further in an open state, the auxiliary oil source drives the main valve core to move from a first position to a second position after sequentially passing through the first pilot cavity and a valve core conducting rod on the pilot valve core, and at the moment, the auxiliary oil source is connected with the load port through a second containing space;
the first preset oil pressure is greater than the second preset oil pressure.
Preferably, the oil chamber switching mechanism further comprises a pilot valve seat, a pilot valve seat through hole is formed in the pilot valve seat, one end of the pilot valve seat is connected with the pilot valve core, the other end of the pilot valve seat extends into the pilot valve seat through hole and is in sliding fit with the pilot valve seat, and a pilot valve core through hole is formed in the valve core conducting rod in the axial direction;
when the pilot valve core is in a closed state, a second pilot cavity is formed among the pilot valve core, the pilot valve seat and the valve core conducting rod, the second pilot cavity is connected with the pilot valve core through hole through a conducting side hole formed in the valve core conducting rod, and at the moment, the first pilot cavity is not communicated with the second pilot cavity;
when the pilot valve core is in an open state, the first pilot cavity is communicated with the second pilot cavity.
Preferably, the first adjusting mechanism comprises an adjusting screw and a pilot valve pressure regulating spring;
one end of the adjusting screw is installed in the pilot valve sleeve and encloses a first accommodating space together with the pilot valve sleeve and the pilot valve core, the pilot valve pressure regulating spring is installed in the first accommodating space and arranged between the adjusting screw and the pilot valve core, and the other end of the adjusting screw extends to the outside of the pilot valve sleeve.
Preferably, one end of the adjusting screw is in threaded connection with the pilot valve sleeve and is used for adjusting the pre-tightening force of the pilot valve pressure regulating spring, and the other end of the adjusting screw is provided with a locking nut.
Preferably, the second adjusting mechanism includes a main valve spring and a main valve end cover, the main valve spool, the main valve sleeve and the main valve end cover together enclose a fourth accommodating space, and the main valve spring is installed in the fourth accommodating space and is arranged between the main valve spool and the main valve end cover.
Preferably, an end cap groove is formed in the main valve end cap, a valve core boss is arranged on the main valve core, and when the main valve core moves towards the main valve end cap, the valve core boss can move into the end cap groove and is in clearance fit with the end cap groove.
Preferably, a main valve oil through hole communicating the third accommodating space and the fourth accommodating space is formed in the main valve element.
Preferably, the pilot valve sleeve is provided with an oil return channel and an oil return port connected with the oil return channel, the pilot valve seat is provided with a first valve seat through hole communicated with the oil return channel, and when the pilot valve core is in an open state, the auxiliary oil source can enter the oil tank through the first pilot cavity, the second pilot cavity, the conduction side hole, the pilot valve core through hole, the first valve seat through hole, the oil return channel and the oil return port in sequence.
Preferably, the main spool divides a space between the main spool and the main spool case into a second accommodation space and a third accommodation space by a main spool valve shoulder disposed along a circumferential direction, wherein a shoulder width of the main spool valve shoulder is equal to a width of a load port disposed on the main spool case.
Preferably, the first preset oil pressure is pa2The second predetermined oil pressure is pa1And, and:
wherein p isaIs the main oil source pressure, pbTo assist the oil source pressure, F0Is the pre-tension of the spring, pb2Is the pressure of the second pilot chamber, A1Is the effective area of the first pilot chamber, A2Is the effective area of the second pilot chamber, A3Is the area of action of the main oil source on the pilot poppet in the first accommodation space.
Compared with the prior art, the invention has the following beneficial effects:
1. when the pilot valve is opened and closed, the action area on one side of the pilot valve is changed, so that the pressure required by the pilot valve is different when the pilot valve is opened and closed, the frequent vibration and switching of the main valve caused by the frequent opening and closing of the pilot valve at a certain pressure point can be avoided, and the working stability and reliability of the reversing valve are ensured. The displacement of the main valve core can not change along with the change of the pressure, and the risk that the main valve core stops at a certain position in the middle is avoided.
2. The invention has the characteristics of compact structure and small volume through the ingenious structural arrangement of the pilot valve core and the pilot valve seat, and is convenient to apply and install.
3. The invention realizes the different main oil source pressures when the main oil source and the auxiliary oil source are switched in the forward and reverse directions, avoids the oscillation of the conventional reversing valve at the critical switching pressure, simultaneously realizes the advantages of low leakage and quick response, and can realize the control of the switching value of the main valve.
4. The first adjusting mechanism and the second adjusting mechanism can adjust the pre-tightening force of the internal elastic body, so that the first preset pressure and the second preset pressure can be adjusted, the structure is flexible, the setting can be more realized according to different application scenes, and the practicability is high.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic cross-sectional side view of the present invention;
FIG. 2 is a schematic diagram of a pilot valve for realizing different opening and closing pressures;
FIG. 3 is a schematic structural diagram of the connection between the valve core and the pilot valve seat of the pilot valve;
FIG. 4 is a schematic structural view of a main valve housing;
fig. 5 is a schematic view of the installation of the complete valve and the valve block.
The figures show that:
1-locking nut 22-load oil port
2-adjusting screw 23-main valve sleeve sealing ring
3-mounting position sealing ring 24-main valve sleeve sealing retainer ring
4-mounting position sealing ring retainer ring 25-main oil source oil port
5- -adjusting screw seal 26- -main valve spring
6-adjusting screw seal ring retainer ring 27-main valve end cover
7- -main oil Source control Port 28- -first Pilot Cavity
8-pilot valve pressure regulating spring 29-second pilot cavity
9-Pilot valve pocket 30-first accommodation space
10-auxiliary oil source control port 31-valve core conducting rod
11-pilot valve core 32-second accommodation space
12-Pilot valve seat 33-third accommodation space
13- -oil return opening 34- -fourth accommodation space
14-pilot valve seat sealing ring 35-pilot valve core through hole
15-pilot valve seat sealing ring retainer ring 36-end cover groove
16-pilot valve sleeve sealing ring 37-valve core boss
17-pilot valve sleeve sealing ring retainer ring 38-first valve seat through hole
18-steel wire retainer ring 39-main valve oil through hole
19-main spool 40-main spool valve shoulder
20-auxiliary oil source port 41-valve core oil drain hole
21- -main valve cover
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1:
the invention provides a mechanical hydraulic control reversing valve, as shown in fig. 1, comprising a first adjusting mechanism, a second adjusting mechanism, a pilot valve sleeve 9, an oil chamber switching mechanism, a main valve core 19 and a main valve sleeve 21, wherein the first adjusting mechanism is installed at one end of the pilot valve sleeve 9, the second adjusting mechanism is installed at one end of the main valve sleeve 21, the other end of the pilot valve sleeve 9 is connected with the other end of the main valve sleeve 21, and an installation chamber is formed inside the pilot valve sleeve, the oil chamber switching mechanism and the main valve core 19 are sequentially arranged in the installation chamber along the direction from the first adjusting mechanism to the second adjusting mechanism, a first accommodating space 30 is formed between the oil chamber switching mechanism and the first adjusting mechanism, a first pilot chamber 28 is formed between the oil chamber switching mechanism and the pilot valve sleeve 9, a second accommodating space 32 and a third accommodating space 33 are respectively formed between the main valve core 19 and the main valve sleeve 21, the oil chamber switching mechanism is provided with a pilot valve core 11, the first accommodating space 30 and the third accommodating space 33 are respectively connected with a main oil source, the first pilot cavity 28 and the second accommodating space 32 are respectively connected with an auxiliary oil source, and the first pilot cavity 28 is preferably connected with the auxiliary oil source through an auxiliary oil source control port 10 arranged on a pilot valve sleeve 9.
Further, when the oil pressure of the main oil source is greater than or equal to a first preset oil pressure, the main spool 19 moves to a first position, the pilot spool 11 is in a closed state, and at this time, the main oil source is connected to the load port 22 provided on the main spool housing 21 through the third accommodation space 33; when the oil pressure of the main oil source is smaller than a second preset oil pressure, the pilot valve spool 11 moves towards the first adjusting mechanism under the action of the oil pressure of the auxiliary oil source and is in an open state, the auxiliary oil source sequentially passes through the first pilot cavity 28 and the spool through rod 31 on the pilot valve spool 11 and then drives the main valve spool 19 to move from the first position to the second position, and at the moment, the auxiliary oil source is connected with the load port 22 through the second accommodating space 32.
Specifically, the first preset oil pressure is pa2The second predetermined oil pressure is pa1，pa1＜pa2As shown in fig. 2, and:
wherein p isaIs the main oil source pressure, pbTo assist the oil source pressure, F0Is the pre-tension of the spring, pb2Is the pressure of the second pilot chamber 29, A1Is the effective area of the first pilot chamber 28, A2Is the effective area of the second pilot chamber 29, A3Is the area of action of the main oil source on the pilot valve element 11 in the first accommodation space 30.
Therefore, the pressure of the main oil source is larger during reverse switching, a section of switching dead zone is generated, frequent opening and closing of the pilot valve caused by pressure fluctuation are avoided, and frequent reversing of the main valve core is avoided.
Specifically, as shown in fig. 1, the oil chamber switching mechanism further includes a pilot valve seat 12, a pilot valve seat through hole is formed in the pilot valve seat 12, one end of the pilot valve seat 12 is connected to the pilot valve element 11, the other end of the pilot valve seat 12 extends into the pilot valve seat through hole and is in sliding fit with the pilot valve seat 12, one end of the pilot valve element 11 connected to the pilot valve seat 12 is in a tapered structure, a pilot valve element through hole 35 is formed in the valve element conducting rod 31 along the axial direction, when the pilot valve element 11 is in a closed state, a second pilot cavity 29 is formed among the pilot valve element 11, the pilot valve seat 12 and the valve element conducting rod 31, the second pilot cavity 29 is connected to the pilot valve element through hole 35 through a conducting hole 36 formed in the valve element conducting rod 31, at this time, the first pilot cavity 28 is not communicated with the second pilot cavity 29, and when the pilot valve element 11 is in an open state, since the pilot spool 11 moves close to the adjusting screw 2, the pilot spool 11 is in close contact with the pilot valve seat 12, so that the first pilot chamber 28 is not communicated with the second pilot chamber 29, and the first pilot chamber 28 is communicated with the second pilot chamber 29.
Further, the valve core conducting rod 31 is circumferentially provided with a valve core oil drainage hole 41 communicating with the pilot valve core through hole 35, the pilot valve sleeve 9 is provided with an oil return channel and an oil return port 13 connected with the oil return channel, the pilot valve seat 12 is provided with a first valve seat through hole 38 communicating with the oil return channel, when the pilot valve core 11 is in a closed state, the valve core oil drainage hole 41 is over against the first valve seat through hole 38 and communicates with the pilot valve core through hole 35 and the first valve seat through hole 38, oil in the pilot valve core through hole 35 can enter the oil tank through the first valve seat through hole 38, the oil return channel and the oil return port 13, and then oil pressure relief in the pilot valve core through hole 35 can be realized, and high pressure cannot be generated. The pilot valve core through hole 35, the conduction side hole 36 and the valve core oil drainage hole 41 are connected to form a variable damping hole, so that when the pilot valve core 11 is opened, the valve core oil drainage hole 41 and the first valve seat through hole 38 are connected in a staggered mode, the leakage flow channel is closed, and when the pilot valve core 11 is closed, the leakage flow channel is opened to release pressure. When the main oil source is operating normally, the pilot spool 11 is closed. When the main oil source fails, the pilot valve core 11 is opened, the first valve seat through hole 38 is closed, and the oil enters the pilot valve core through hole 35. The structure can play a certain role in reducing and controlling the leakage of oil.
Specifically, the first adjusting mechanism comprises an adjusting screw 2 and a pilot valve pressure regulating spring 8, one end of the adjusting screw 2 is installed inside the pilot valve sleeve 9 and encloses a first accommodating space 30 together with the pilot valve sleeve 9 and the pilot valve core 11, the pilot valve pressure regulating spring 8 is installed in the first accommodating space 30 and is arranged between the adjusting screw 2 and the pilot valve core 11, the other end of the adjusting screw 2 extends to the outside of the pilot valve sleeve 9, one end of the adjusting screw 2 is preferably in threaded connection with the pilot valve sleeve 9 and is used for adjusting the pre-tightening force of the pilot valve pressure regulating spring 8, the other end of the adjusting screw 2 is provided with a locking nut 1, when the pre-tightening force of the pilot valve pressure regulating spring 8 is adjusted to a preset pre-tightening force, the adjusting screw 2 is locked by the locking nut 1, and the adjusting screw 2 is prevented from generating radial displacement so as to change the pre-tightening force of the pilot valve, thereby increasing the stability of the operation of the reversing valve.
Specifically, the second adjusting mechanism includes a main valve spring 26 and a main valve cover 27, the main valve spool 19, the main valve sleeve 21 and the main valve cover 27 together enclose a fourth accommodating space 34, the main valve spring 26 is installed in the fourth accommodating space 34 and disposed between the main valve spool 19 and the main valve cover 27, the main valve cover 27 is preferably installed at an end of the main valve sleeve 21 in a threaded manner, and the adjustment of the preload of the main valve spring 26 can be achieved by rotating the main valve cover 27 inward or outward.
Furthermore, an end cover groove 36 is arranged on the main valve end cover 27, a valve core boss 37 is arranged on the main valve core 19, when the main valve core 19 moves towards the main valve end cover 27, the valve core boss 37 can move into the end cover groove 36 and is in clearance fit with the end cover groove 36, when the main valve core 19 moves to be close to the main valve end cover 27, a part of oil between the valve core boss 37 and the end cover groove 36 is sealed, the oil is forced to be extruded out from a gap between the valve core boss 37 and the end cover groove 36, and therefore great resistance is generated to enable the main valve core 19 to brake stably, mutual collision of the valve core end covers of the main valve core 19 is avoided, the stability of the equipment is achieved, and the service life of the equipment is prolonged.
The main valve spool 19 is provided with a main valve oil through hole 39 that communicates the third accommodation space 33 and the fourth accommodation space 34, and when the main valve spool 19 moves rightward, the fourth accommodation space 34 becomes smaller in space and the internal pressure becomes higher, and the internal oil is pressed into the third accommodation space 33 through the main valve oil through hole 39, and when the main valve spool 19 moves leftward, the oil in the third accommodation space 33 is pressed into the fourth accommodation space 34 through the main valve oil through hole 39, and the main valve oil through hole 39 functions as a damping hole, so that the main valve spool 19 moves more smoothly.
Specifically, the main valve element 19 divides a space between the main valve element 19 and the main valve housing 21 into a second accommodating space 32 and a third accommodating space 33 by a main valve element shoulder 40 arranged along the circumferential direction, wherein the shoulder width of the main valve element shoulder 40 is equal to the width of the load oil port 22 arranged on the main valve housing 21 in order to avoid oil crosstalk between the load oil port 22 and the main oil source oil port 25 and the auxiliary oil source oil port 20 and to avoid the situation that the load oil port 22 and the two oil sources are not communicated simultaneously.
Specifically, for the requirement of assembly, the pilot-controlled directional control valve of the present invention is further provided with a plurality of sealing members, as shown in fig. 1, one end of the pilot valve sleeve 9, where the adjusting screw 2 is installed, is provided with a first annular groove along the circumferential direction, the first annular groove is sequentially provided with the installation position sealing ring 3 and the installation position sealing ring retainer ring 4, one end of the pilot valve sleeve 9, which is connected to the main valve sleeve 21, is provided with a fourth annular groove along the circumferential direction, and the fourth annular groove is sequentially provided with the pilot valve sleeve sealing ring 16 and the pilot valve sleeve sealing ring retainer ring 17. The adjusting screw 2 is provided with a second annular groove along the circumferential direction, and an adjusting screw sealing ring 5 and an adjusting screw sealing ring retainer ring 6 are sequentially arranged in the second annular groove. A third annular groove is formed in the circumferential direction of the pilot valve seat 12, a pilot valve seat sealing ring 14 and a pilot valve seat sealing ring retaining ring 15 are sequentially arranged in the third annular groove, the pilot valve sleeve 9 and the main valve sleeve 21 are preferably in threaded connection, a steel wire retaining ring 18 is arranged between the pilot valve sleeve 9 and the main valve sleeve 21, a fifth annular groove is formed in the main valve sleeve 21 along the circumferential direction, and a main valve sleeve sealing ring 23 and a main valve sleeve sealing retaining ring 24 are sequentially arranged in the fifth annular groove.
Example 2:
this embodiment is a preferred embodiment of embodiment 1.
As shown in fig. 4 and 5, the valve block of the present embodiment is provided with a main oil source port, an auxiliary oil source port, a load port, and an oil return port. When the oil pressure of the two oil sources is normal, the pilot valve element 11 is in a closed state, the main valve element 19 is always in the leftmost position under the action of the main valve spring 26 and the oil pressure of the main valve element spring cavity, and at this time, the load oil port is connected with the main oil source oil port, and the working state is that the main oil source supplies oil. When the oil supply pressure of the main oil source is lower than the second preset oil pressure, the pilot valve element 11 is opened, the main valve element 19 moves to the rightmost end position under the action of the oil pressure of the main valve left cavity, the spring force of the main valve and the oil pressure of the main valve element spring cavity, the load oil port is connected with the auxiliary oil source oil port at the moment, and the working state is that the auxiliary oil source supplies oil.
The working principle of the invention is as follows:
when the pressure of the main oil source is reduced to be smaller than a second preset oil pressure, the oil supply pressure of the main oil source control port 7 is reduced, the pilot valve core 11 is opened under the action of the oil pressure of the auxiliary oil source control port 10, the oil pressure of the main oil source control port 7 and the pressure regulating spring 8, oil of the auxiliary oil source control port 10 enters the left side of the main valve core 19 through the damping hole, the main valve core 19 is pushed to move rightwards by overcoming the main valve spring 26 and the main oil source oil pressure on the right side of the main valve, and therefore the load oil port 22 is connected with the auxiliary oil source oil inlet 20, and oil supply of the auxiliary oil source is achieved. When the main oil source oil pressure is restored to the first preset oil pressure, the pilot valve spool 11 is closed under the actions of the oil pressure of the auxiliary oil source control port 10, the oil pressure of the main oil source control port 7 and the pressure regulating spring 8, and the main valve spring 26 pushes the main valve spool 19 to move and restore to the leftmost position, so that the load oil port 22 is connected with the main oil source oil inlet 25, and the main oil source oil supply is restored.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A mechanical hydraulic control reversing valve is characterized by comprising a first adjusting mechanism, a second adjusting mechanism, a pilot valve sleeve (9), an oil chamber switching mechanism, a main valve core (19) and a main valve sleeve (21);
a first adjusting mechanism is installed at one end of the pilot valve sleeve (9), a second adjusting mechanism is installed at one end of the main valve sleeve (21), the other end of the pilot valve sleeve (9) is connected with the other end of the main valve sleeve (21) and an installation chamber is formed inside the pilot valve sleeve, the oil chamber switching mechanism and the main valve core (19) are sequentially arranged in the installation chamber along the direction from the first adjusting mechanism to the second adjusting mechanism, a first accommodating space (30) is formed between the oil chamber switching mechanism and the first adjusting mechanism, a first pilot chamber (28) is formed between the oil chamber switching mechanism and the pilot valve sleeve (9), and a second accommodating space (32) and a third accommodating space (33) are respectively formed between the main valve core (19) and the main valve sleeve (21);
a pilot valve core (11) is arranged in the oil chamber switching mechanism, the first accommodating space (30) and the third accommodating space (33) are respectively connected with a main oil source, and the first pilot cavity (28) and the second accommodating space (32) are respectively connected with an auxiliary oil source;
when the oil pressure of a main oil source is larger than or equal to a first preset oil pressure, the main valve core (19) moves to a first position, the pilot valve core (11) is in a closed state, and at the moment, the main oil source is connected with a load port (22) arranged on a main valve sleeve (21) through a third accommodating space (33);
when the oil pressure of a main oil source is smaller than a second preset oil pressure, the pilot valve core (11) moves towards the first adjusting mechanism under the action of the oil pressure of the auxiliary oil source and is further in an open state, the auxiliary oil source drives the main valve core (19) to move from a first position to a second position after sequentially passing through the first pilot cavity (28) and a valve core conducting rod (31) on the pilot valve core (11), and at the moment, the auxiliary oil source is connected with the load port (22) through a second containing space (32);
the first preset oil pressure is greater than the second preset oil pressure.
2. The mechanical hydraulic control reversing valve according to claim 1, wherein the oil chamber switching mechanism further comprises a pilot valve seat (12), a pilot valve seat through hole is formed in the pilot valve seat (12), one end of the pilot valve seat (12) is connected with the pilot valve core (11), the other end of the pilot valve seat (12) extends into the pilot valve seat through hole and is in sliding fit with the pilot valve seat (12), and the valve core through rod (31) is provided with a pilot valve core through hole (35) in the axial direction;
when the pilot valve core (11) is in a closed state, a second pilot cavity (29) is formed among the pilot valve core (11), the pilot valve seat (12) and the valve core conducting rod (31), the second pilot cavity (29) is connected with the pilot valve core through hole (35) through a conducting side hole (36) formed in the valve core conducting rod (31), and at the moment, the first pilot cavity (28) is not communicated with the second pilot cavity (29);
when the pilot valve spool (11) is in an open state, the first pilot chamber (28) communicates with the second pilot chamber (29).
3. The mechanically-hydraulically-controlled directional valve according to claim 1, characterized in that the first adjustment mechanism comprises an adjusting screw (2) and a pilot valve pressure regulating spring (8);
one end of the adjusting screw (2) is installed in the pilot valve sleeve (9), the pilot valve sleeve (9) and the pilot valve core (11) jointly enclose a first accommodating space (30), the pilot valve pressure regulating spring (8) is installed in the first accommodating space (30) and arranged between the adjusting screw (2) and the pilot valve core (11), and the other end of the adjusting screw (2) extends to the outside of the pilot valve sleeve (9).
4. The mechanical hydraulic control reversing valve according to claim 3, wherein one end of the adjusting screw (2) is in threaded connection with a pilot valve sleeve (9) and is used for adjusting the pretightening force of the pilot valve pressure regulating spring (8), and a locking nut (1) is installed at the other end of the adjusting screw (2).
5. The mechanically pilot operated directional valve according to claim 1, wherein the second adjustment mechanism comprises a main valve spring (26) and a main valve end cap (27), the main valve spool (19), the main valve sleeve (21) and the main valve end cap (27) jointly enclosing a fourth accommodation space (34), and the main valve spring (26) is installed in the fourth accommodation space (34) and disposed between the main valve spool (19) and the main valve end cap (27).
6. The mechanically pilot operated directional valve according to claim 5, wherein an end cap groove (36) is provided on the main valve end cap (27), and a spool boss (37) is provided on the main spool (19), the spool boss (37) being movable into the end cap groove (36) and in clearance fit with the end cap groove (36) when the main spool (19) is moved toward the main valve end cap (27).
7. The mechanical pilot-operated directional valve according to claim 5, wherein the main valve spool (19) is provided with a main valve oil passing through hole (39) communicating the third accommodation space (33) and the fourth accommodation space (34).
8. The mechanical hydraulic control reversing valve according to claim 2, wherein an oil return channel and an oil return opening (13) connected with the oil return channel are arranged on the pilot valve sleeve (9), a first valve seat through hole (38) communicated with the oil return channel is arranged on the pilot valve seat (12), and when the pilot valve core (11) is in an open state, the auxiliary oil source can sequentially enter the oil tank through the first pilot cavity (28), the second pilot cavity (29), the conduction side hole (36), the pilot valve core through hole (35), the first valve seat through hole (38), the oil return channel and the oil return opening (13).
9. The mechanical pilot-operated directional valve according to claim 1, wherein the main spool (19) divides a space between the main spool (19) and the main spool housing (21) into a second accommodation space (32) and a third accommodation space (33) by a main spool valve shoulder (40) provided along a circumferential direction, wherein a shoulder width of the main spool valve shoulder (40) is equal to a width of a load port (22) provided on the main spool housing (21).
10. The mechanically-hydraulically-controlled directional control valve of claim 1, wherein the first predetermined oil pressure is pa2The second predetermined oil pressure is pa1And, and:
wherein p isaIs the main oil source pressure, pbTo assist the oil source pressure, F0Is the pre-tension of the spring, pb2Is the pressure of the second pilot chamber (29), A1Is the effective area of the first pilot chamber (28), A2Is the effective area of the second pilot chamber (29), A3Is the area of action of the main oil source on the pilot spool (11) in the first accommodation space (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011491985.4A CN112594244B (en) | 2020-12-16 | 2020-12-16 | Mechanical hydraulic control reversing valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011491985.4A CN112594244B (en) | 2020-12-16 | 2020-12-16 | Mechanical hydraulic control reversing valve |
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| Publication Number | Publication Date |
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| CN112594244A true CN112594244A (en) | 2021-04-02 |
| CN112594244B CN112594244B (en) | 2022-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011491985.4A Active CN112594244B (en) | 2020-12-16 | 2020-12-16 | Mechanical hydraulic control reversing valve |
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| Country | Link |
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| CN113107919A (en) * | 2021-04-23 | 2021-07-13 | 温州大学 | Embedded half-bridge guide control mechanism of rotary valve and fluid control valve |
| CN113757099A (en) * | 2021-09-07 | 2021-12-07 | 江苏汇智高端工程机械创新中心有限公司 | Control valve for electric control plunger pump |
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| CN113107919A (en) * | 2021-04-23 | 2021-07-13 | 温州大学 | Embedded half-bridge guide control mechanism of rotary valve and fluid control valve |
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| CN113757099B (en) * | 2021-09-07 | 2023-09-26 | 江苏汇智高端工程机械创新中心有限公司 | Control valve for electric control plunger pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112594244B (en) | 2022-09-13 |
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