CN112360834B - Oil supply source automatic switching thread cartridge reversing valve - Google Patents
Oil supply source automatic switching thread cartridge reversing valve Download PDFInfo
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- CN112360834B CN112360834B CN202011103620.XA CN202011103620A CN112360834B CN 112360834 B CN112360834 B CN 112360834B CN 202011103620 A CN202011103620 A CN 202011103620A CN 112360834 B CN112360834 B CN 112360834B
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- oil
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- pilot valve
- pilot
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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
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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
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston
Abstract
The invention relates to a thread cartridge reversing valve with automatic switching of oil supply sources, which comprises: a pilot valve: the pilot valve comprises a pilot valve sleeve, a pilot valve element arranged in a pilot valve element mounting hole and a pilot valve seat fixed in the pilot valve seat mounting hole, wherein a pilot valve left cavity is formed between the left end surface of the pilot valve element and the bottom end of the pilot valve element mounting hole, and a pilot valve right cavity is formed between the right end surface of the pilot valve element and the left end surface of the pilot valve seat; a main valve: the left end of the main valve core is inserted into a main valve sleeve in the pilot valve sleeve, the main valve core is arranged in the main valve sleeve, and a main valve end cover is arranged at the right end of the main valve sleeve. Compared with the prior art, the invention can realize the difference of the main oil source pressure when the main oil source and the auxiliary oil source are switched in the forward and reverse directions, and avoid the oscillation of the conventional reversing valve at the critical switching pressure.
Description
Technical Field
The invention relates to the field of hydraulic valve and fluid transmission control, in particular to a threaded cartridge reversing valve with automatic switching of oil supply sources.
Background
The reversing valve is a directional control valve with more than two flow forms and more than two oil ports, and is a valve for realizing communication, cutting off and reversing of hydraulic oil flow, pressure unloading and sequential action control.
The thread 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 a main oil source fluctuates near the set switching pressure, a pilot valve can be opened and closed frequently, so that the main valve is switched frequently and vibrates frequently, the safety and the reliability of the whole valve are influenced, in addition, the displacement of the main valve core can be changed along with the change of the pressure, and the risk that the main valve core stops at a certain middle position exists, so that the normal work of the reversing valve is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a threaded cartridge reversing valve with an automatic oil supply source switching function.
The purpose of the invention can be realized by the following technical scheme:
a thread cartridge change-over valve for automatically switching over an oil supply source, which is installed in a valve block and communicates with an oil passage in the valve block, comprising:
a pilot valve: the pilot valve comprises a pilot valve sleeve, a pilot valve core arranged in a pilot valve core mounting hole and a pilot valve seat fixed in the pilot valve seat mounting hole, wherein the left part of the pilot valve core is of a slide valve structure, the right part of the pilot valve core is of a cone valve structure, a pilot valve left cavity is formed by the left end surface of the pilot valve core and the bottom end of the pilot valve core mounting hole, a pilot valve spring is arranged in the pilot valve left cavity, and a pilot valve right cavity is formed between the right end surface of the pilot valve core and the left end surface of the pilot valve seat;
a main valve: the left end of the main valve core is inserted into a main valve sleeve in the pilot valve sleeve, the main valve core is arranged in the main valve sleeve, and a main valve end cover is installed at the right end of the main valve sleeve.
The pilot valve sleeve is sequentially provided with a main oil source control port communicated with the left cavity of the pilot valve, an oil return port communicated with the right cavity of the pilot valve through a damping hole and an auxiliary oil source control port communicated with the pilot valve seat mounting hole from left to right.
The center of the left end face of the pilot valve seat is provided with a second pilot cavity communicated with the auxiliary oil source control port, and the damping hole is communicated with the left cavity of the main valve through a first auxiliary oil duct arranged on the pilot valve seat.
When the pilot valve core is located at the right side closed position, the second pilot cavity is blocked by the cone valve structure at the right part of the pilot valve core, the pilot valve right cavity is compressed to form a first pilot cavity which is not communicated with the second pilot cavity, and the sum of the oil pressure action areas of the first pilot cavity and the second pilot cavity is smaller than the oil pressure action area at the left side of the pilot valve core.
The main valve sleeve is sequentially provided with an auxiliary oil source port and a load oil port from left to right, and the main valve end cover is provided with a main oil source oil port.
When the main valve core is located at the closing position of the left auxiliary oil duct, the load oil port is directly communicated with the main oil source oil port through the main valve right cavity, and when the main valve core is located at the opening position of the right auxiliary oil duct, the auxiliary oil source port and the load oil port are respectively communicated through the second auxiliary oil duct.
The valve block is provided with:
an auxiliary oil channel for communicating the upper auxiliary oil source port with the upper auxiliary oil source control port;
the oil return channel is used for communicating the oil return port with the oil tank;
an auxiliary oil source channel for communicating the auxiliary oil source with the auxiliary oil source port at the lower part;
a main oil source channel for communicating the main oil source and the main oil source oil port;
and the load oil channel is used for communicating the load oil port at the lower part with the load port.
The steps of the reversing valve for switching the main oil supply and the auxiliary oil supply are as follows:
when the pressure of the main oil source is normal, the pilot valve core is located at the right side closed position, the main valve core is located at the left side auxiliary oil passage closed position, and the load port is directly communicated with the main oil source through the load oil port, the main valve right cavity and the main oil source oil port for supplying oil;
when the pressure of the main oil source is reduced to be lower than a set auxiliary switching value, the pressure of main oil source supply oil of a main oil source control port is reduced, the main oil source supply oil of the main oil source control port and a pressure regulating spring are jointly acted, the main oil source supply oil moves to a left side opening position to enable a pilot valve core to be opened, oil of the auxiliary oil source sequentially passes through an auxiliary oil source port, an auxiliary oil source control port and a damping hole to be communicated with an oil return port, and as the pressure of load oil is increased to a set value, a left cavity of a main valve overcomes the oil pressure of a main valve spring and the main oil source to push the main valve core to move to a right side auxiliary oil passage opening position, so that a load oil port is communicated with an auxiliary oil source oil inlet through a second auxiliary oil passage to achieve oil supply of the auxiliary oil source;
when the oil pressure of the main oil source is recovered and rises to exceed the set auxiliary switching value, the pilot valve core returns to the right side closed position under the combined action of the oil pressure of the auxiliary oil source control port, the oil pressure of the main oil source control port and the pressure regulating spring, the main valve spring and the oil pressure of the main oil source push the main valve core to move and return to the left side auxiliary oil passage closed position, so that the load oil port is communicated with the main oil source oil inlet, and the oil supply of the main oil source is recovered.
In the process of switching main and auxiliary oil supply, the pressure difference when the main oil source is switched to the auxiliary oil source in the forward and reverse directions is set, and a switching dead zone is generated to avoid frequent opening and closing of the pilot valve caused by pressure fluctuation.
Through design parameters, the pressure when the main oil source is switched to the auxiliary oil source in the forward and reverse directions is different, and then:
wherein p isbTo assist the oil source pressure, pb1Oil pressure of the right chamber of the pilot valve when the pilot valve element is opened, A1Is the effective area of the first pilot chamber, A2Is the second pilot chamber effective area, A3Is the active area of the main oil source, and A1、A2、A3Determined by the structural parameters of the pilot valve core and the pilot valve seat, pb1Is determined by the size of the orifice.
Compared with the prior art, the invention has the following advantages:
the invention realizes the different pressures needed by the pilot valve when the pilot valve is opened and closed by designing the pilot valve core and changing the action area of one side of the pilot valve, thereby avoiding 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, ensuring the working stability and reliability of the valve, and in addition, 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.
Drawings
FIG. 1 is a schematic diagram of the reversing valve of the present invention.
Fig. 2 is a schematic diagram of the structure of the pilot valve part.
Fig. 3 is a structural view of the pilot valve seat, in which fig. 3a is a front view and fig. 3b is a left side view.
Fig. 4 is a view of the entire valve and valve block installation.
The notation in the figure is:
1. the pilot valve comprises a pilot valve sleeve, 2, a pilot valve sealing ring, 3, a pilot valve sealing ring retainer, 4, a pilot valve spring, 5, a main oil source control port, 6, a pilot valve core, 7, an oil return port, 8, a damping hole, 9, a pilot valve seat, 10, a pilot oil source control port, 11, a main valve core, 12, a main valve sleeve, 13, a main valve sealing ring, 14, a main valve sealing ring retainer, 15, a pilot oil source port, 16, a main valve spring, 17, a load oil port, 18, a main valve end cover, 19, a main oil source oil port, 20, a first pilot cavity, 21 and a second pilot cavity.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1, the present invention provides a threaded cartridge reversing valve for realizing an automatic energy switching function, which includes a pilot valve sleeve 1, a pilot valve seal ring 2, a pilot valve seal ring retainer 3, a pilot valve spring 4, a main oil source control port 5, a pilot valve core 6, an oil return port 7, a damping hole 8, a pilot valve seat 9, an auxiliary oil source control port 10, a main valve core 11, a main valve sleeve 12, a main valve seal ring 13, a main valve seal ring retainer 14, an auxiliary oil source port 15, a main valve spring 16, a load oil port 17, a main valve end cover 18, and a main oil source oil port 19.
When the pressure of the main oil source is reduced, the oil supply pressure of the main oil source control port 5 is reduced, the pilot valve core 7 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 5 and the pressure regulating spring 4, and the oil of the auxiliary oil source control port 10 is communicated with the oil return port through the damping hole 8. The left cavity of the main valve is connected with the damping hole 8, when the load oil pressure rises to a certain value, the main valve core 11 is pushed to move to the rightmost end by overcoming the main valve spring 16 and the main oil source oil pressure, so that the load oil port 17 is connected with the auxiliary oil source oil inlet 15, and the auxiliary oil source oil supply is realized. When the main oil source oil pressure is restored to the set value, the pilot valve element 6 is closed 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 5 and the pressure regulating spring 4, the main valve spring 16 and the main oil source oil pressure push the main valve element 11 to move and restore to the original leftmost position, so that the load oil port 17 is connected with the main oil source oil inlet 19, and the main oil source oil supply is restored.
As shown in fig. 2, the different implementation principles of the opening and closing pressures of the pilot valves are as follows:
structurally: p is a radical ofaIs the main oil source pressure, pbTo assist the oil source pressure, F0Is the pre-tightening force of the pilot spring, pb1Is the oil pressure at the right side of the pilot valve when the pilot chamber is opened, A1Is the first pilot chamber effective area, A2Is the second pilot chamber effective area, A3Is the main oil source action area.
The main oil source pressure of the system switched from the main oil source to the auxiliary oil source is as follows:
the main oil source pressure of the system switched from the auxiliary oil source back to the main oil source is as follows:
A1、A2、A3determined by the structural parameters of the pilot valve core and the valve seat, pb1Is determined by the size of the damping hole on the oil return path. It can be seen that, through reasonable parameter design, it is possible to make:
therefore, the pressure of the main oil source during forward and reverse switching is different, 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 cannot be generated.
As shown in fig. 2, the structure and operation principle of the valve core and the valve seat of the pilot valve are as follows: the structure of the pilot valve core is composed of two parts, wherein the left end is a slide valve structure, the right end is a cone valve structure, the slide valve structure at the left end is used for isolating a main oil source control oil liquid and an auxiliary oil source control oil liquid, and the cone valve structure at the right end is used for controlling the on-off of the oil liquid.
As shown in fig. 3, when the main oil source is in normal oil pressure, the pilot valve core is in a closed state, the through hole in the pilot valve seat connects the left side cavity of the main valve core with the oil return port, which makes the oil pressure on the left side of the main valve core consistent with the oil tank pressure, the main valve core is located at the leftmost side, which is the working state of the main oil source, when the oil pressure of the main oil source is reduced to be lower than the set pressure, the auxiliary oil source control oil is connected to the oil tank through the damping hole and the oil return hole, a certain pressure is built at the front end of the damping hole, the pressure oil flows into the left end of the main valve core through the above-mentioned channel, the main valve core is pushed to the rightmost end against the main valve spring force and the main oil source pressure, which is the oil supply state of the auxiliary oil source.
Examples
The embodiment is a structural scheme of the above-mentioned threaded cartridge reversing valve for realizing the automatic energy switching function. As shown in FIG. 4, the threaded cartridge type directional control valve is shown in a schematic view of the valve block. The valve block is provided with a main oil source oil port, an auxiliary oil source oil port, a load oil port and an oil return port. When the oil pressure of the two oil sources is normal, the main valve core 11 is always at the leftmost position under the action of the main valve spring 16 and the oil pressure of the main oil source in the right cavity of the valve core, and the load oil port 17 is connected with the main oil source oil port 19 at the moment, so that the main oil source is supplied with oil in a working state. When the oil supply pressure of the main oil source is lower than the set switching pressure, the pilot valve core 6 is opened, the main valve core moves to the rightmost end position under the combined action of the left cavity pressure, the right cavity pressure and the spring force, 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 embodiments described above are presented to enable those skilled in the art to make and use the invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (8)
1. A thread cartridge reversing valve with automatic switching of an oil supply source is installed in a valve block and communicated with an oil duct in the valve block, and is characterized by comprising:
a pilot valve: the pilot valve comprises a pilot valve sleeve (1), a pilot valve core (6) arranged in a pilot valve core mounting hole and a pilot valve seat (9) fixed in the pilot valve seat mounting hole, wherein the left part of the pilot valve core (6) is of a slide valve structure, the right part of the pilot valve core is of a cone valve structure, a left pilot valve cavity is formed between the left end surface of the pilot valve core and the bottom end of the pilot valve core mounting hole, a pilot valve spring (4) is arranged in the left pilot valve cavity, a right pilot valve cavity is formed between the right end surface of the pilot valve core (6) and the left end surface of the pilot valve seat (9), a main oil source control port (5) communicated with the left pilot valve cavity, an oil return port (7) communicated with the right pilot valve cavity through a damping hole (8) and an auxiliary oil source control port (10) communicated with the pilot valve seat mounting hole are sequentially arranged on the pilot valve sleeve (1) from left to right, a second pilot cavity (21) communicated with the auxiliary oil source control port (10) is arranged in the center of the left end surface of the pilot valve seat (9), the damping hole (8) is communicated with the left cavity of the main valve through a first auxiliary oil duct arranged on the pilot valve seat (9);
a main valve: the left end of the main valve core (11) is provided with a second auxiliary oil channel, the cross section of the main valve core (11) is I-shaped, a main valve left cavity is formed between the left end face of the main valve core (11) and the right end face of the pilot valve seat (9), a main valve right cavity is formed between the right end face of the main valve core and the main valve end cover (18), and a main valve spring (16) is arranged in the main valve right cavity.
2. The automatic switching thread cartridge reversing valve of the oil supply source is characterized in that when the pilot valve core (6) is located at the right side closed position, the second pilot cavity (21) is blocked by the conical valve structure at the right part of the pilot valve core (6), the right pilot valve cavity is compressed to form a first pilot cavity (20) which is not communicated with the second pilot cavity (21), and the sum of the oil pressure acting areas of the first pilot cavity (20) and the second pilot cavity (21) is smaller than the oil pressure acting area at the left side of the pilot valve core (6).
3. The automatic switching thread cartridge reversing valve of an oil supply source according to claim 1, characterized in that an auxiliary oil source port (15) and a load oil port (17) are sequentially formed on the main valve sleeve (12) from left to right, and a main oil source oil port (19) is formed on the main valve end cover (18).
4. The threaded cartridge reversing valve for automatically switching the fuel supply according to claim 3, wherein the load port (17) is directly communicated with the main fuel supply port (19) through the main valve right chamber when the main valve spool (11) is in the left auxiliary fuel gallery closed position, and the auxiliary fuel supply port (15) and the load port (17) are respectively communicated through the second auxiliary fuel gallery when the main valve spool (11) is in the right auxiliary fuel gallery open position.
5. The automatic switching thread cartridge reversing valve of the oil supply source according to claim 4, characterized in that the valve block is provided with:
an auxiliary oil passage for communicating the upper auxiliary oil source port (15) with the upper auxiliary oil source control port (10);
an oil return passage for communicating the oil return port (7) with the oil tank;
an auxiliary oil source passage for communicating the auxiliary oil source with an auxiliary oil source port (15) at a lower portion;
a main oil source passage for communicating the main oil source with the main oil source port (19);
a load oil passage for communicating the load oil port (17) at the lower portion with the load port.
6. The threaded cartridge type directional control valve with automatic switching of oil supply source according to claim 5, characterized in that the step of switching the main and auxiliary oil supply of the directional control valve is as follows:
when the pressure of the main oil source is normal, the pilot valve core (7) is located at the right side closed position, the main valve core (11) is located at the left side auxiliary oil passage closed position, and the load port is directly communicated with the main oil source through the load oil port (17), the main valve right cavity and the main oil source oil port (19) to supply oil;
when the pressure of the main oil source is reduced to be lower than a set auxiliary switching value, the pressure of the main oil source oil supply of the main oil source control port (5) is reduced, the main oil source oil supply of the auxiliary oil source control port (10), the pressure of the main oil source oil supply of the main oil source control port (5) and a pressure regulating spring (4) jointly act to move to a left side opening position, so that the pilot valve core (7) is opened, the oil of the auxiliary oil source sequentially passes through the auxiliary oil source port (15), the auxiliary oil source control port (10) and the damping hole (8) to be communicated with the oil return port (7), as the left cavity of the main valve is communicated with the damping hole (8) through the first auxiliary oil duct, when the pressure of the load oil is increased to a set value, the left cavity of the main valve overcomes the main valve spring (16) and the oil pressure of the main oil source to push the main valve core (11) to move to a right side auxiliary oil duct opening position, so that the load oil port (17) is communicated with the oil inlet (15) of the auxiliary oil source through the second auxiliary oil duct, the oil supply of an auxiliary oil source is realized;
when the oil pressure of the main oil source is recovered and rises to exceed the set auxiliary switching value, the pilot valve core (6) returns to the right side closed position under the combined action of the oil pressure of the auxiliary oil source control port (10), the oil pressure of the main oil source control port (5) and the pressure regulating spring (4), the main valve spring (16) and the oil pressure of the main oil source push the main valve core (11) to move and return to the left side auxiliary oil passage closed position, so that the load oil port (17) is communicated with the main oil source oil inlet (19), and the oil supply of the main oil source is recovered.
7. The automatic switching thread cartridge reversing valve of the oil supply source as claimed in claim 6, wherein in the process of switching the main oil supply and the auxiliary oil supply, the pressure difference is set when the main oil supply is switched to the auxiliary oil supply in the forward and reverse directions, and a switching dead zone is generated to avoid the frequent opening and closing of the pilot valve caused by pressure fluctuation.
8. The threaded cartridge reversing valve for automatically switching the oil supply source according to claim 7, wherein the pressure when the main oil source is switched to the auxiliary oil source in the forward and reverse directions is different according to design parameters, and the pressure comprises the following pressure:
wherein p isbTo assist the oil source pressure, pb1Oil pressure of the right chamber of the pilot valve when the pilot valve element is opened, A1Is the effective area of the first pilot chamber, A2Is the second pilot chamber effective area, A3Is the active area of the main oil source, and A1、A2、A3Determined by the structural parameters of the pilot valve core and the pilot valve seat, pb1Is determined by the size of the orifice.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011103620.XA CN112360834B (en) | 2020-10-15 | 2020-10-15 | Oil supply source automatic switching thread cartridge reversing valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011103620.XA CN112360834B (en) | 2020-10-15 | 2020-10-15 | Oil supply source automatic switching thread cartridge reversing valve |
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| CN112360834A CN112360834A (en) | 2021-02-12 |
| CN112360834B true CN112360834B (en) | 2021-10-08 |
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| CN114654452A (en) * | 2022-04-28 | 2022-06-24 | 纯米科技(上海)股份有限公司 | Manipulator structure |
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| US3554214A (en) * | 1968-07-11 | 1971-01-12 | Monsun Tison Ab | Valve device with relief action and suction action for hydraulic systems |
| CN2584977Y (en) * | 2002-11-08 | 2003-11-05 | 徐连奎 | Automatic air control switching valve |
| US7959173B1 (en) * | 2007-09-26 | 2011-06-14 | Alkon Corporation | Air distribution apparatus |
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| CN112360834A (en) | 2021-02-12 |
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