CN113864266A - Integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve - Google Patents

Integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve Download PDF

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Publication number
CN113864266A
CN113864266A CN202111064272.4A CN202111064272A CN113864266A CN 113864266 A CN113864266 A CN 113864266A CN 202111064272 A CN202111064272 A CN 202111064272A CN 113864266 A CN113864266 A CN 113864266A
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China
Prior art keywords
valve core
pilot
oil
pilot valve
main valve
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CN202111064272.4A
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CN113864266B (en
Inventor
李瑞川
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Rizhao Haizhuo Hydraulic Co ltd
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Rizhao Haizhuo Hydraulic Co ltd
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Priority to CN202111064272.4A priority Critical patent/CN113864266B/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/024—Pressure relief valves
    • 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
    • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
    • 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
    • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The invention discloses an integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve which comprises a valve body, wherein a pilot valve core is arranged in a valve cavity, one end of the pilot valve core is connected with a valve core driving device, the other end of the pilot valve core is sleeved with a main valve core, a plug is arranged on the main valve core at the outer end of the pilot valve core, and a steady-state closing oil cavity is formed between the plug and the outer end of the main valve core; the near driving end of the valve body is provided with a plurality of circumferentially distributed oil return holes, the far driving end of the valve body is provided with a plurality of circumferentially distributed oil inlet holes, a first logic matching surface and a second logic matching surface are arranged between the main valve core and the valve body, a proportional throttling control logic matching surface is arranged between the pilot valve core and the main valve core, and a pressure relief device for communicating the oil return holes and closing the oil cavity in a stable state is arranged between the pilot valve core and the main valve core; the integral thread plug-in type structure is adopted, so that the installation is convenient; when the throttle valve does not work, the steady-state closing can be realized; when the device needs to work, quick response can be realized.

Description

Integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve
Technical Field
The invention relates to a one-way throttle valve, in particular to an integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve.
Background
At present, in the return circuit of constituteing by traditional hydraulic pressure component group, because links such as choke valve, switching-over valve, overflow valve all have great leakage problem, response problem, impact problem etc. and the valves tie point is many, and the oil circuit is complicated, and the reliability is poor, installs inconveniently, and occupation space is great, and the cost is higher. Different application occasions have differences in sealing structures, response speeds and the like, the requirements of modularized, flexible and high-performance integrated valve banks are obvious, and no related technology can well solve the problems at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing an integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve which is good in sealing performance and adopts a modular design.
In order to solve the technical problems, the technical scheme of the invention is as follows: the integral thread cartridge type low-energy-level steady-state closing proportional pilot one-way throttle valve comprises an integral thread cartridge type valve body, a valve cavity is arranged in the valve body, a pilot valve core extending axially is mounted in the valve cavity, one end of the pilot valve core is connected with a valve core driving device, the other end of the pilot valve core is sleeved with a main valve core, a plug is mounted on the main valve core at the outer end of the pilot valve core, a pilot moving cavity is arranged between the outer end of the pilot valve core and the plug, and a steady-state closing oil cavity is formed between the plug and the outer end of the main valve core; the near-driving end of the valve body is provided with a plurality of oil return holes distributed in the circumferential direction, the far-driving end of the valve body is provided with a plurality of oil inlet holes distributed in the circumferential direction, the main valve core and the valve body are provided with a first logic matching surface and a second logic matching surface which are located between the oil return holes and the oil inlet holes, the pilot valve core and the main valve core are provided with a proportional throttling control logic matching surface, and a pressure relief device communicated with the oil return holes and the oil cavity is closed in a stable state is arranged between the pilot valve core and the main valve core.
As a preferred technical scheme, the valve core driving device comprises a proportional electromagnet installed at the driving end of the valve body, one end of the proportional electromagnet extends into the valve body and is in threaded connection with the valve body, one end of the pilot valve core extends into the proportional electromagnet and is connected with a power output shaft of the proportional electromagnet in an abutting mode, and a pilot return device is installed between the pilot valve core and the valve body.
As a preferred technical scheme, the pilot return device comprises a return spring sleeved on the pilot valve core, a first spring seat is fixedly mounted on the pilot valve core, a second spring seat is arranged on the inner wall of the valve body, one end of the return spring abuts against the first spring seat, and the other end of the return spring abuts against the second spring seat.
As a preferred technical solution, the first logic matching surface is disposed close to the oil return hole, and the second logic matching surface is disposed close to the oil inlet hole.
As a preferred technical scheme, an oil drainage hole for communicating an inner cavity of the pilot valve core with the oil return hole is formed in the pilot valve core.
As a preferred technical scheme, the pressure relief device comprises a pressure relief long hole arranged on the main valve core, a pressure relief logic oil passage is arranged between the pilot valve core and the main valve core, one end of the pressure relief long hole is communicated with the steady-state closed oil cavity, the other end of the pressure relief long hole is communicated with the oil drainage logic oil passage, and the other end of the oil drainage logic oil passage is connected with the proportional throttling control logic matching surface.
As an optimal technical scheme, the pressure relief logic oil passage comprises a first annular groove which is arranged on the main valve core and communicated with the pressure relief long hole, and a second annular groove which is arranged on the pilot valve core and connected with the proportional throttling control logic matching surface, wherein the pilot valve core and the main valve core are provided with pressure relief logic matching surfaces, and the axial distance of the pressure relief logic matching surfaces is smaller than the axial pilot movement distance of the pilot valve core.
As a preferable technical scheme, an axial sealing device close to the plug is arranged between the pilot valve core and the main valve core.
As a preferred technical scheme, the axial sealing device comprises a sealing groove arranged on the peripheral wall of the pilot valve core, and a low-damping sealing ring is installed in the sealing groove.
As a preferred technical scheme, a limit check ring is installed in the sealing groove at one side, far away from the plug, of the low-damping sealing ring.
By adopting the technical scheme, the integral thread cartridge type low-energy-level steady-state closing proportional pilot one-way throttle valve comprises an integral thread cartridge type valve body, a valve cavity is arranged in the valve body, a pilot valve core extending axially is arranged in the valve cavity, one end of the pilot valve core is connected with a valve core driving device, the other end of the pilot valve core is sleeved with a main valve core, a plug is arranged on the main valve core at the outer end of the pilot valve core, a pilot moving cavity is arranged between the outer end of the pilot valve core and the plug, and a steady-state closing oil cavity is arranged between the plug and the outer end of the main valve core; the near driving end of the valve body is provided with a plurality of circumferentially distributed oil return holes, the far driving end of the valve body is provided with a plurality of circumferentially distributed oil inlet holes, a first logic matching surface and a second logic matching surface which are positioned between the oil return holes and the oil inlet holes are arranged between the main valve core and the valve body, a proportional throttling control logic matching surface is arranged between the pilot valve core and the main valve core, and a pressure relief device which is communicated with the oil return holes and the stable closed oil cavity is arranged between the pilot valve core and the main valve core; the integral thread plug-in type structure is adopted, so that the installation is convenient; when the throttle valve does not work, the steady-state closing can be realized; when the device needs to work, quick response can be realized.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 is a schematic structural diagram of a closed state according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an open state according to an embodiment of the present invention;
FIG. 3 is an enlarged view taken at I in FIG. 1;
in the figure: 11-a valve body; 12-a valve cavity; 13-pilot spool; 14-main spool; 15-plug by screw; 16-a pilot movement chamber; 17-steady state closed oil chamber; 21-first logical mating surface; 22-a second logical mating surface; 23-proportional throttle control logic mating surface; 31-proportional electromagnet; 32-a return spring; 33-a first spring seat; 34-a second spring seat; 41-pressure relief long hole; 42-a first ring groove; 43-a second ring groove; 44-pressure relief logic mating surface; 5-oil drainage holes; t-oil return hole; p-oil inlet hole.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
As shown in fig. 1 and fig. 2, the integral thread-inserted low-energy-level steady-state closing proportional pilot one-way throttle valve includes an integral thread-inserted valve body 11, a valve cavity 12 is disposed in the valve body 11, an axially-extending pilot valve element 13 is mounted in the valve cavity 12, one end of the pilot valve element 13 is connected to a valve element driving device, a main valve element 14 is sleeved at the other end of the pilot valve element 13, a plug 15 is mounted on the main valve element 14 at the outer end of the pilot valve element 13, a pilot moving cavity 16 is disposed between the outer end of the pilot valve element 13 and the plug 15, a steady-state closing oil cavity 17 is disposed between the plug 15 and the outer end of the main valve element 14, and after the throttle valve is inserted into the valve block body, the oil cavity sealed and enclosed by the plug 15, the main valve element 14, the valve body 11 and the valve block main valve body is the steady-state closing oil cavity 17; a plurality of circumferentially distributed oil return holes T are formed in the near-drive end of the valve body 11, a plurality of circumferentially distributed oil inlet holes P are formed in the far-drive end of the valve body 11, a first logic matching surface 21 and a second logic matching surface 22 which are located between the oil return holes T and the oil inlet holes P are formed between the main valve core 14 and the valve body 11, the first logic matching surface 21 is arranged close to the oil return holes T, and the first logic matching surface 21 is a cylindrical surface logic matching surface; the second logic matching surface 22 is arranged close to the oil inlet hole P, and the second logic matching surface 22 is a double-cone logic matching surface; a proportional throttling control logic matching surface 23 is arranged between the pilot valve core 13 and the main valve core 14, the proportional throttling control logic matching surface 23 is a double-conical-surface logic matching surface, and a pressure relief device for communicating the oil return hole T with the steady-state closed oil cavity 17 is arranged between the pilot valve core 13 and the main valve core 14.
The spool driving means includes a proportional electromagnet 31 installed at the driving end of the valve body 11, one end of the proportional electromagnet 31 extends into the valve body 11 and is in threaded connection with the valve body 11, the threaded connection between the electromagnet and the valve body 11 forms a threaded seal at this end of the valve body 11, one end of the pilot valve core 13 extends into the proportional electromagnet 31 and is connected with a power output shaft of the proportional electromagnet 31 in an abutting mode, a pilot return device is arranged between the pilot valve core 13 and the valve body 11, the pilot return device comprises a return spring 32 sleeved on the pilot valve core 13, a first spring seat 33 is fixedly arranged on the pilot valve core 13, a second spring seat 34 is arranged on the inner wall of the valve body 11, one end of the return spring 32 abuts against the first spring seat 33, and the other end of the return spring 32 abuts against the second spring seat 34.
The pressure relief device comprises a pressure relief long hole 41 arranged on the main valve core 14, a pressure relief logic oil passage is arranged between the pilot valve core 13 and the main valve core 14, one end of the pressure relief long hole 41 is communicated with the steady-state closed oil cavity 17, the other end of the pressure relief long hole 41 is communicated with the oil drainage logic oil passage, and the other end of the oil drainage logic oil passage is connected with the proportional throttling control logic matching surface 23. As shown in fig. 3, the pressure relief logic oil passage includes a first ring groove 42 that is disposed on the main spool 14 and is communicated with the pressure relief slot 41, and further includes a second ring groove 43 that is disposed on the pilot spool 13 and is connected to the proportional throttle control logic fitting surface 23, the pilot spool 13 and the main spool 14 are provided with a pressure relief logic fitting surface 44, and an axial distance of the pressure relief logic fitting surface 44 is smaller than an axial pilot movement distance of the pilot spool 13.
An oil drainage hole 5 for communicating the inner cavity of the pilot valve core 13 with the oil return hole T is formed in the pilot valve core 13; the number of the oil drainage holes 5 can be one to two according to the requirement; during operation, hydraulic oil in the steady-state closed oil cavity 17 outside the plug 15 can enter the pilot movement cavity 16 and the inner cavity of the pilot valve core 13 through a gap between the plug 15 and the pilot valve core 13, the hydraulic oil is communicated with the oil return hole T through the oil drainage hole 5 on the pilot valve core 13, and redundant oil pressure can be drained through the oil return hole T, so that the stability of the working state is ensured.
An axial sealing device close to the plug 15 is arranged between the pilot valve core 13 and the main valve core 14. The axial sealing device comprises a sealing groove arranged on the peripheral wall of the pilot valve core 13, and a low-damping sealing ring is installed in the sealing groove. The low damping seal ring is far away from 15 one sides of plug screw install spacing retaining ring in the seal groove, spacing retaining ring is the polytetrafluoroethylene retaining ring.
The axial sealing device can also be realized by installing an O-shaped sealing ring in the sealing groove; the axial seal between the pilot valve element 13 and the main valve element 14 can also be achieved by setting the degree of fit between the two.
The three forms of axial sealing structures can enable the throttle valve to have different performances:
1) by using the low-damping sealing ring, higher response can be realized, and the leakage is nearly zero;
2) the O-shaped ring is adopted for sealing, so that the damping is large, the linearity is poor, the nearly zero leakage can be realized, and the O-shaped ring can be used for a pilot proportional control valve or a pilot switch valve with low linearity requirement;
3) the use of a pilot-type micro-leak proportional valve sealed by a mating surface (without a seal ring) between the pilot spool 13 and the main spool 14 enables the throttle valve to achieve high response.
The technical scheme has the following characteristics:
1. the integral type thread cartridge design is adopted, the shell of the valve body 11 is an integral complex cylindrical part, an O-shaped ring groove is arranged at the outer end part of the outer side close to the electromagnet, an O-shaped sealing ring is arranged in the O-shaped ring groove, the outer thread of the electromagnet is connected with the inner thread of the valve body 11, and the O-shaped sealing ring and the thread are connected to form a sealing structure at the end. Two rows of circular holes are circumferentially and uniformly distributed on the outer cylindrical surface of the valve body 11, and one row of holes close to the front end part of the valve body 11 is an oil inlet hole P and one row of holes close to the rear end surface of the valve body 11 is an oil return hole T.
2. The right side of oil return hole T is the coaxial main valve structure of three-section, and pilot valve core 13, main valve core 14 and the coaxial design of valve body 11 adopt the second grade to seal, can realize zero totally leaking, does in proper order:
1) the pilot stage cylindrical seal, i.e. the first logic mating face 21, achieves zero leakage of the control stage.
2) The pilot secondary cone/sphere seal structure, i.e., the second logic mating face 22, provides zero-leakage protection of the pilot tip.
Three coaxial logical mating surfaces are provided between main spool 14 and valve body 11:
a first logic surface with a proportional throttle orifice, namely a first logic matching surface 21, of which the leftmost end is close to the oil return port T;
a conical surface/spherical surface switch surface at the middle position, namely a second logic matching surface 22, the surface on the valve body 11 is a conical surface, and the surface on the main valve core 14 is a spherical surface;
and the cylinder guide matching surface at the rightmost end and the cylinder matching surface between the valve body 11 and the main valve core 14 have a guide function when the main valve core 14 acts.
There are also three coaxial logical mating surfaces between main spool 14 and pilot spool 13:
the left end of the large-diameter area is a double-conical leakage-free logic surface, namely the proportional throttling control logic matching surface 23.
The middle end is a proportional throttling logic portion, namely the pressure relief logic mating surface 44.
And the rightmost end is a cylindrical logic matching surface between the pilot valve core 13 and the main valve core 14, and mainly plays a role in guiding and mechanical sealing.
3. The central part of the main valve core 14 is provided with a pilot valve core 13, a double-conical logic matching surface (namely a proportional throttling control logic matching surface 23) and a cylindrical logic matching surface are arranged between the pilot valve core 13 and the main valve core 14, and the tail part of the cylindrical matching part of the pilot valve core 13 and the main valve core 14 is provided with an axial sealing device which can adopt the three sealing structures and can realize nearly zero leakage. The pilot valve core 13 is axially constrained by a left return spring and a right plug 15, and the pilot valve core 13, the main valve core 14, the valve body 11 and the proportional electromagnet 31 are coaxially arranged.
4. The proportional pilot throttle valve is an independent module structure, and the proportional pilot throttle valve is designed by adopting a modular interface structure, does not need to be adjusted and is directly installed in a valve body of the valve bank.
The working principle is as follows: one end of the cylindrical matching part of the pilot valve core 13 and the main valve core 14, which is close to the plug 15, is provided with a low-damping sealing ring, so that almost zero leakage can be realized, and micro leakage can be realized when the sealing ring is not provided. When the current of the proportional electromagnet 31 is zero, the proportional throttling control logic matching surface 23 (double conical surfaces) between the pilot valve core 13 and the main valve core 14 is in a closed state, when pressure oil exists in the oil inlet hole P, the oil inlet hole P generates a right acting force (towards the direction of the plug 15) on the main valve core 14, meanwhile, the pressure oil enters the steady-state closing oil cavity 17 on the outer side of the plug 15 on the right side of the main valve core 14 through a gap between the main valve core 14 and the valve body 11 on the outer side of the oil inlet hole P, and hydraulic oil of the steady-state closing oil cavity 17 generates a left acting force on the main valve core 14; because the force-bearing area at the oil inlet hole P is smaller than that at the plug 15, the leftward acting force on the main valve element 14 is larger than the rightward acting force, the pressure oil at the oil inlet hole P generates the leftward acting force on the whole main valve element 14, the first logic matching surface 21 and the second logic matching surface 22 between the main valve element 14 and the valve body 11 are both in a steady-state closed state, and the proportional throttling control logic matching surface 23 between the pilot valve element 13 and the main valve element 14 is also in a steady-state closed state. The pressure oil at the oil inlet hole P cannot be communicated with the oil return hole T.
When the electromagnet generates current, the electromagnetic force pushes the pilot valve core 13 to move rightwards, the proportional throttling control logic matching surface 23 and the pressure relief logic matching surface 44 between the pilot valve core 13 and the main valve core 14 are both in an open state, the pressure relief device is opened, hydraulic oil in the steady-state closed oil cavity 17 outside the plug 15 sequentially passes through the pressure relief long hole 41, the first annular groove 42, the pressure relief logic matching surface 44, the second annular groove 43 and the proportional throttling control logic matching surface 23 and enters the oil return hole T, so that the pressure at the plug 15 on the right side of the main valve core 14 is reduced, at the moment, the rightward acting force generated by the oil inlet hole P on the main valve core 14 is greater than the leftward acting force generated by the plug 15, the main valve core 14 is pushed to move rightwards, and the first logic matching surface 21 and the second logic matching surface 22 between the main valve core 14 and the valve body 11 are both in an open state. The pressure oil of the oil inlet hole P is communicated with the oil return hole T.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. Integral screw thread cartridge formula low energy position steady state closes proportion guide's one-way choke valve, its characterized in that: the valve comprises an integral threaded plug-in valve body, wherein a valve cavity is arranged in the valve body, a pilot valve core extending axially is arranged in the valve cavity, one end of the pilot valve core is connected with a valve core driving device, the other end of the pilot valve core is sleeved with a main valve core, a plug is arranged on the main valve core at the outer end of the pilot valve core, a pilot moving cavity is arranged between the outer end of the pilot valve core and the plug, and a stable closing oil cavity is arranged between the plug and the outer end of the main valve core; the near-driving end of the valve body is provided with a plurality of oil return holes distributed in the circumferential direction, the far-driving end of the valve body is provided with a plurality of oil inlet holes distributed in the circumferential direction, the main valve core and the valve body are provided with a first logic matching surface and a second logic matching surface which are located between the oil return holes and the oil inlet holes, the pilot valve core and the main valve core are provided with a proportional throttling control logic matching surface, and a pressure relief device communicated with the oil return holes and the oil cavity is closed in a stable state is arranged between the pilot valve core and the main valve core.
2. The integral threaded cartridge low-energy steady-state closed-proportion pilot check throttle valve of claim 1, wherein: the valve core driving device comprises a proportional electromagnet installed at the valve body driving end, one end of the proportional electromagnet extends into the valve body and is in threaded connection with the valve body, one end of the pilot valve core extends into the interior of the proportional electromagnet and is connected with a power output shaft of the proportional electromagnet in an abutting mode, and a pilot return device is installed between the pilot valve core and the valve body.
3. The integral threaded cartridge low-energy steady-state closed-proportion pilot check throttle valve of claim 2, wherein: the pilot return device comprises a return spring sleeved on the pilot valve core, a first spring seat is fixedly mounted on the pilot valve core, a second spring seat is arranged on the inner wall of the valve body, one end of the return spring abuts against the first spring seat, and the other end of the return spring abuts against the second spring seat.
4. The integral threaded cartridge low-energy steady-state closed-proportion pilot check throttle valve of claim 1, wherein: the first logic matching surface is arranged close to the oil return hole; the second logic matching surface is arranged close to the oil inlet hole.
5. The integral threaded cartridge low-energy steady-state closed-proportion pilot check throttle valve of claim 1, wherein: and an oil drainage hole for communicating the inner cavity of the pilot valve core with the oil return hole is formed in the pilot valve core.
6. The integral threaded cartridge low-energy steady-state closed-proportion pilot check throttle valve of claim 1, wherein: the pressure relief device comprises a pressure relief long hole formed in the main valve core, a pressure relief logic oil passage is arranged between the pilot valve core and the main valve core, one end of the pressure relief long hole is communicated with the steady-state closed oil cavity, the other end of the pressure relief long hole is communicated with the oil drainage logic oil passage, and the other end of the oil drainage logic oil passage is connected with the proportional throttling control logic matching surface.
7. The integral threaded cartridge low energy steady state closed ratio pilot check throttle valve of claim 6, wherein: pressure release logic oil duct is including setting up on the main valve core and with the first annular of pressure release slot hole intercommunication still including setting up on the pilot valve core and with the second annular that proportional throttle control logic fitting surface is connected, the pilot valve core with the main valve core is provided with pressure release logic fitting surface, the axial distance of pressure release logic fitting surface will be less than the axial guide displacement distance of pilot valve core.
8. The integral threaded cartridge low energy steady state closed ratio pilot check throttle valve of any one of claims 1 to 7, wherein: an axial sealing device close to the plug is arranged between the pilot valve core and the main valve core.
9. The integral threaded cartridge low energy steady state closed ratio pilot check throttle valve of claim 8, wherein: the axial sealing device comprises a sealing groove arranged on the peripheral wall of the pilot valve core, and a low-damping sealing ring is arranged in the sealing groove.
10. The integral threaded cartridge low energy steady state closed ratio pilot check throttle valve of claim 9, wherein: and a limiting check ring is arranged in the sealing groove at one side of the low-damping sealing ring far away from the plug.
CN202111064272.4A 2021-09-10 2021-09-10 Integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve Active CN113864266B (en)

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CN202111064272.4A CN113864266B (en) 2021-09-10 2021-09-10 Integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve

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Application Number Priority Date Filing Date Title
CN202111064272.4A CN113864266B (en) 2021-09-10 2021-09-10 Integral thread plug-in type low-energy-level steady-state closing proportion pilot one-way throttle valve

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CN113864266A true CN113864266A (en) 2021-12-31
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JP2000055231A (en) * 1998-08-03 2000-02-22 Kenji Masuda Proportional throttle valve
CN103233936A (en) * 2013-04-28 2013-08-07 华侨大学 Insertion-structure-based pilot-operated electric-hydraulic proportional spill valve
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