CN108757623B - Stable two-way proportional throttle valve - Google Patents
Stable two-way proportional throttle valve Download PDFInfo
- Publication number
- CN108757623B CN108757623B CN201810945015.3A CN201810945015A CN108757623B CN 108757623 B CN108757623 B CN 108757623B CN 201810945015 A CN201810945015 A CN 201810945015A CN 108757623 B CN108757623 B CN 108757623B
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- Prior art keywords
- valve
- main valve
- hole
- main
- oil
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- 238000007789 sealing Methods 0.000 claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims abstract description 32
- 239000012530 fluid Substances 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention relates to the technical field of valves and discloses a stable two-way proportional throttle valve which comprises a main valve seat, a displacement sensor and a pilot valve, wherein a main valve cavity is arranged in the main valve seat, a main valve cover is arranged at the upper end of the main valve cavity, an oil port A and an oil port B are arranged on the side surface of the main valve seat, a valve sleeve is arranged in the main valve cavity, a lower through hole and an upper through hole are arranged on the side surface of the main valve sleeve, a driving cylinder is arranged on the outer side surface of the main valve cover, a hollow main valve core is arranged in the valve sleeve, a main piston is arranged on the main valve core, a sealing hole is arranged in the center of a valve sleeve limiting seat, a braking piston fixed with the main valve core is arranged in the driving cavity, an upper oil hole is arranged at the upper end of the side surface of the driving cylinder, a lower oil hole is arranged at the lower end of the side surface of the driving cylinder, the upper oil hole and the lower oil hole are respectively connected with the pilot valve through a pipeline, a sensor positioning seat is arranged at the upper end of the driving cylinder, and the displacement sensor is fixed in the sensor positioning seat. The invention has the advantages of good stability, long service life and convenient maintenance.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a stable two-way proportional throttle valve.
Background
The two-way proportional throttle valve is widely applied to equipment such as die casting machines, forging presses, ceramic presses and the like, and the basic working principle of the proportional throttle valve is as follows: the valve core displacement of the large-diameter proportional throttle valve is controlled in a closed loop mode through the pilot type proportional servo valve with small specification and the displacement sensor on the main valve core, so that the opening degree of the proportional throttle valve is accurately controlled, and the flow rate proportion adjusting function through the oil port A and the oil port B is realized. The displacement sensor in the current common two-way proportional throttle valve is directly communicated with an A oil port, the A oil port is a working oil port and is usually connected with a pipeline or an actuating mechanism, the A oil port is provided with larger pressure impact or negative pressure, the pressure impact or negative pressure easily causes fatal damage to the displacement sensor, the volume and the weight of the proportional throttle valve are large, the mass of the large-specification two-way proportional throttle valve is tens of kilograms or even more than 100 kilograms, the displacement sensor can be detached and installed only by means of various tools and lifting equipment when being replaced, and the displacement sensor is difficult to replace, long in maintenance and repair and high in cost.
Disclosure of Invention
The invention provides a stable two-way proportional throttle valve, which aims to solve the problem that a displacement sensor in the two-way proportional throttle valve is easily damaged by oil pressure impact or negative pressure state in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The utility model provides a stable two-way proportional throttle valve, includes main disk seat, displacement sensor, pilot valve, be equipped with main valve pocket in the main disk seat, the upper end of main valve pocket is equipped with main valve gap, the side of main valve seat is equipped with the A hydraulic fluid port, the B hydraulic fluid port that communicate with main valve pocket, be equipped with cylindric valve pocket in the main valve pocket, the bottom of main valve pocket is equipped with the spacing seat of valve pocket, the medial surface of main valve cap is equipped with the spacing bulge loop with valve pocket upper end outside joint, the side of valve pocket is equipped with the lower through-hole that communicates with the A hydraulic fluid port, the side of valve pocket is equipped with the upper through-hole that communicates with the B hydraulic fluid port, the lateral surface of main valve cap is equipped with the actuating cylinder, be equipped with cylindric actuating chamber in the actuating cylinder, actuating chamber coaxial with the valve pocket, be equipped with the lower connecting through-hole that is used for communicating actuating chamber and main valve pocket on the main valve pocket, the upper end of actuating cylinder is equipped with the upper connecting through-hole; the valve sleeve is internally provided with a hollow main valve core, a main piston is arranged at the position, located in the valve sleeve, of the main valve core, a sealing hole is formed in the center of a valve sleeve limiting seat, the lower end of the main valve core is in clearance fit with the sealing hole, the upper end of the main valve core penetrates through a lower connecting through hole to extend into a driving cavity, a brake piston fixed with the main valve core is arranged in the driving cavity, the upper end of the side face of the driving cylinder is provided with an upper oil hole communicated with the driving cavity, the lower end of the side face of the driving cylinder is provided with a lower oil hole communicated with the driving cavity, the upper oil hole and the lower oil hole are respectively connected with a pilot valve through pipelines, a sensor positioning seat is arranged at the upper end of the driving cylinder, the upper end of the main valve core is in clearance fit with the upper connecting through hole, a displacement sensor is fixed in the sensor positioning seat, and the displacement sensor coaxially extends into the main valve core.
When the power-off state or no instruction signal is generated, the default state is that the oil port A and the oil port B are in the closed state, namely, when the oil port A and the oil port B are required to be communicated, the pilot valve controls the oil outlet to feed oil, so that the brake piston is driven to drive the whole main valve and the main piston to move upwards for a certain section, the specific displacement is detected by the displacement sensor to feed signals back to the pilot valve, so that the opening degree of the oil port A and the opening degree of the oil port B are quantitatively controlled, and when the oil port A and the oil port B are required to be cut off, the pilot valve controls the oil outlet to feed oil, and the brake piston drives the main valve and the main piston to move downwards, so that the oil communication between the oil port A and the oil port B is cut off; in the whole use process, the displacement sensor is completely isolated from the main valve cavity, the oil port A and the oil port B through the hollow main valve core all the time, and is not influenced by oil pressure impact or negative pressure at the oil port A and the oil port B and is not influenced by high-temperature and low-temperature mediums, so that the stability of the displacement sensor is better, the displacement sensor is not easy to damage, and the whole service life and the stability are prolonged; by adopting the independent valve sleeve structure, the valve sleeve can be independently processed and assembled and is easy to surface treat, thereby greatly reducing the processing precision of the main valve cavity, the processing cost and the surface treatment cost.
Preferably, a pressure relief oil port is arranged on the side surface of the upper end of the sensor positioning seat. When the main valve core leaks from the sealing hole and the upper connecting through hole, leaked oil can be discharged from the pressure relief oil port, so that the displacement sensor is prevented from being affected by oil pressure, and the sealing state of the main valve core, the sealing hole and the upper connecting through hole can be judged according to the oil of the pressure relief oil port.
Preferably, an annular cavity is formed between the valve sleeve and the main valve cavity, an isolation convex ring for isolating the oil port A and the oil port B is arranged on the inner wall of the main valve cavity, and the inner wall of the isolation convex ring is sealed with the outer wall of the valve sleeve through a sealing ring; the upper through holes and the lower through holes on the side face of the valve sleeve are all in a plurality, the upper through holes are distributed along the circumferential direction of the valve sleeve, and the lower through holes are distributed along the circumferential direction of the valve sleeve. The upper through holes and the lower through holes are all provided with a plurality of holes, so that large flow between the oil ports A and B can be ensured, and the pressure loss is small.
Preferably, a plurality of oil holes are formed between two end faces of the main piston, a conical sealing seat is arranged at a position, located between the upper through hole and the lower through hole, of the inner wall of the valve sleeve, a sealing conical surface matched with the conical sealing seat is arranged at the lower end of the main piston, and a sealing ring is arranged between the side face of the upper end of the main piston and the valve sleeve. The upper side cavity and the lower side cavity of the main piston are communicated through the oil holes, so that the main piston is prevented from being pressed on one side to displace, the upper side cavity can be prevented from generating vacuum, the quality of the main piston can be lightened, and the sensitivity of pilot valve control is improved.
Preferably, O-shaped rings are arranged at the inner walls of the lower connecting through hole, the upper connecting through hole and the sealing hole. The joints of various parts need sliding sealing, and an O-shaped ring is arranged to play a role in sealing.
Preferably, the pilot valve is a proportional servo valve.
Therefore, the invention has the following beneficial effects: (1) The displacement sensor is completely isolated from the main valve cavity, the oil port A and the oil port B, is not influenced by oil pressure impact or negative pressure, is not influenced by cold and hot media, and has good stability, long service life and difficult damage; (2) By adopting the independent valve sleeve structure, the valve sleeve can be independently processed and assembled and is easy to surface treat, thereby greatly reducing the processing precision of the main valve cavity, the processing cost and the surface treatment cost.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of the state when the port a and the port B are communicated.
Fig. 3 is a partially enlarged schematic view of fig. 2 at C.
In the figure: the hydraulic valve comprises a main valve seat 1, a displacement sensor 2, a pilot valve 3, a main valve cavity 4, a main valve cover 5, an oil port A6, an oil port B7, a valve sleeve 8, an annular cavity 9, an isolation convex ring 10, a lower through hole 11, an upper through hole 12, a valve sleeve limiting seat 13, a limiting convex ring 14, a driving cylinder 15, a driving cavity 16, a main valve core 17, a main piston 18, a sealing hole 19, a brake piston 20, an upper oil hole 21, a lower oil hole 22, a sensor positioning seat 23, a pressure relief oil port 24, an oil through hole 25, a conical sealing seat 26 and a sealing conical surface 27.
Detailed Description
The invention is further described with reference to the drawings and detailed description which follow:
The stable two-way proportional throttle valve shown in fig. 1 comprises a main valve seat 1, a displacement sensor 2 and a pilot valve 3, wherein the pilot valve is a proportional servo valve, a main valve cavity 4 is arranged in the main valve seat, a main valve cover 5 is arranged at the upper end of the main valve cavity, an A oil port 6 and a B oil port 7 which are communicated with the main valve cavity are arranged on the side surface of the main valve seat, a cylindrical valve sleeve 8 is arranged in the main valve cavity, an annular cavity 9 is formed between the valve sleeve and the main valve cavity, an isolation convex ring 10 for isolating the A oil port and the B oil port is arranged on the inner wall of the main valve cavity, the inner wall of the isolation convex ring is sealed with the outer wall of the valve sleeve through a sealing ring, a lower through hole 11 communicated with the A oil port is arranged on the side surface of the valve sleeve, an upper through hole 12 communicated with the B oil port is arranged on the side surface of the valve sleeve, a plurality of upper through holes and lower through holes are arranged on the side surface of the valve sleeve, the upper through holes are distributed along the circumferential direction of the valve sleeve, and the lower through holes are distributed along the circumferential direction of the valve sleeve.
The bottom of the main valve cavity 4 is provided with a valve sleeve limiting seat 13, the inner side surface of the main valve cover 5 is provided with a limiting convex ring 14 which is clamped with the outer side of the upper end of the valve sleeve, the outer side surface of the main valve cover is provided with a driving cylinder 15, a cylindrical driving cavity 16 is arranged in the driving cylinder, the driving cavity is coaxial with the valve sleeve, the main valve cover is provided with a lower connecting through hole for communicating the driving cavity with the main valve cavity, and the upper end of the driving cylinder is provided with an upper connecting through hole; a hollow main valve core 17 is arranged in the valve sleeve, a main piston 18 is arranged at the position, which is positioned in the valve sleeve, on the main valve core, a sealing hole 19 is arranged in the center of a valve sleeve limiting seat 13, the lower end of the main valve core is in clearance fit with the sealing hole, the upper end of the main valve core penetrates through a lower connecting through hole to extend into a driving cavity, a brake piston 20 fixed with the main valve core is arranged in the driving cavity, an upper oil hole 21 communicated with the driving cavity is arranged at the upper end of the side surface of the driving cylinder, a lower oil hole 22 communicated with the driving cavity is arranged at the lower end of the side surface of the driving cylinder, the upper oil hole and the lower oil hole are respectively connected with a pilot valve 3 through pipelines, a sensor positioning seat 23 is arranged at the upper end of the driving cylinder, the upper end of the main valve core is in clearance fit with the upper connecting through hole, a displacement sensor 2 is fixed in the sensor positioning seat, and the displacement sensor coaxially extends into the main valve core; the side of the upper end of the sensor positioning seat is provided with a pressure relief oil port 24.
As shown in fig. 1 and 3, a plurality of oil holes 25 are arranged between two end surfaces of the main piston, a conical sealing seat 26 is arranged at a position between the upper through hole and the lower through hole at the inner wall of the valve sleeve 8, a sealing conical surface 27 matched with the conical sealing seat is arranged at the lower end of the main piston, and a sealing ring is arranged between the side surface of the upper end of the main piston and the valve sleeve; the inner walls of the lower connecting through hole, the upper connecting through hole and the sealing hole are respectively provided with an O-shaped ring.
The principle of the invention is as follows, in combination with the accompanying drawings: as shown in fig. 1, when in a power-off state or no command signal, the default state is that the oil port A and the oil port B are closed, namely the main valve core and the main piston are in the downward limit position, and the oil port A and the oil port B are separated; when the oil ports A and B are required to be communicated, the pilot valve is used for controlling the oil inlet of the oil outlet, so that the brake piston is driven to drive the main valve core and the main piston to integrally move upwards for a certain section, a specific displacement is detected by the displacement sensor and signals are fed back to the pilot valve, and the opening sizes of the oil ports A and B are quantitatively controlled, and the state is shown in the figure 2 at the moment; similarly, when the oil port A and the oil port B are required to be cut off, the pilot valve controls the oil feeding hole to feed oil, and the brake piston drives the main valve core and the main piston to move downwards, so that oil communication between the oil port A and the oil port B is cut off; in the whole use process, the displacement sensor is completely isolated from the main valve cavity, the oil port A and the oil port B through the hollow main valve core all the time, and is not influenced by oil pressure impact or negative pressure at the oil port A and the oil port B and is not influenced by high-temperature and low-temperature mediums, so that the stability of the displacement sensor is better, the displacement sensor is not easy to damage, and the whole service life and the stability are prolonged; by adopting the independent valve sleeve structure, the valve sleeve can be independently processed and assembled and is easy to surface treat, thereby greatly reducing the processing precision of the main valve cavity, the processing cost and the surface treatment cost.
In this embodiment, the signal transmission, processing, control and feedback between the displacement sensor and the pilot valve are all common techniques in the existing two-way proportional throttle valve, which belong to the prior art and are not the techniques to be protected by the present application, so that the description of this part of the prior art is not repeated in this embodiment. The technical features of the present application are not limited to the above embodiments, but all the simple changes, equivalent substitutions or modifications made to solve the same technical problems and achieve the same technical effects are included in the scope of the present application.
Claims (6)
1. The utility model provides a stable two-way proportional throttle valve, includes main disk seat, displacement sensor, pilot valve, be equipped with main valve pocket in the main disk seat, the upper end of main valve pocket is equipped with main valve gap, the side of main valve seat is equipped with the A hydraulic fluid port, the B hydraulic fluid port that are linked together with main valve pocket, characterized by, be equipped with cylindric valve pocket in the main valve pocket, the bottom of main valve pocket is equipped with the spacing seat of valve pocket, the medial surface of main valve gap is equipped with the spacing bulge loop with the outside joint of valve pocket upper end, the side of valve pocket is equipped with the lower through-hole that is linked together with the A hydraulic fluid port, the side of valve pocket is equipped with the upper through-hole that is linked together with the B hydraulic fluid port, the lateral surface of main valve cap is equipped with the actuating cylinder, be equipped with cylindric actuating chamber in the actuating cylinder, actuating cylinder and valve pocket coaxial, be equipped with the lower connecting through-hole that is used for linking actuating chamber and main valve pocket on the main valve pocket, the upper end of actuating cylinder is equipped with connecting the through-hole; the valve sleeve is internally provided with a hollow main valve core, a main piston is arranged at the position, located in the valve sleeve, of the main valve core, a sealing hole is formed in the center of a valve sleeve limiting seat, the lower end of the main valve core is in clearance fit with the sealing hole, the upper end of the main valve core penetrates through a lower connecting through hole to extend into a driving cavity, a brake piston fixed with the main valve core is arranged in the driving cavity, the upper end of the side face of the driving cylinder is provided with an upper oil hole communicated with the driving cavity, the lower end of the side face of the driving cylinder is provided with a lower oil hole communicated with the driving cavity, the upper oil hole and the lower oil hole are respectively connected with a pilot valve through pipelines, a sensor positioning seat is arranged at the upper end of the driving cylinder, the upper end of the main valve core is in clearance fit with the upper connecting through hole, a displacement sensor is fixed in the sensor positioning seat, and the displacement sensor coaxially extends into the main valve core.
2. The stable two-way proportional throttle valve according to claim 1, wherein the side surface of the upper end of the sensor positioning seat is provided with a pressure relief oil port.
3. The stable two-way proportional throttle valve according to claim 1, wherein an annular cavity is formed between the valve sleeve and the main valve cavity, an isolation convex ring for isolating an oil port A and an oil port B is arranged on the inner wall of the main valve cavity, and the inner wall of the isolation convex ring is sealed with the outer wall of the valve sleeve through a sealing ring; the upper through holes and the lower through holes on the side face of the valve sleeve are all in a plurality, the upper through holes are distributed along the circumferential direction of the valve sleeve, and the lower through holes are distributed along the circumferential direction of the valve sleeve.
4. A stable two-way proportional throttle valve according to claim 1 or 3, characterized in that a plurality of oil holes are arranged between two end surfaces of the main piston, a conical sealing seat is arranged at a position between the upper through hole and the lower through hole at the inner wall of the valve sleeve, a sealing conical surface matched with the conical sealing seat is arranged at the lower end of the main piston, and a sealing ring is arranged between the side surface of the upper end of the main piston and the valve sleeve.
5. The stable two-way proportional throttle valve as claimed in claim 1, wherein the inner walls of the lower connecting through hole, the upper connecting through hole and the sealing hole are respectively provided with an O-shaped ring.
6. The stable two-way proportional throttle valve of claim 1, wherein the pilot valve is a proportional servo valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810945015.3A CN108757623B (en) | 2018-08-20 | 2018-08-20 | Stable two-way proportional throttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810945015.3A CN108757623B (en) | 2018-08-20 | 2018-08-20 | Stable two-way proportional throttle valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108757623A CN108757623A (en) | 2018-11-06 |
| CN108757623B true CN108757623B (en) | 2024-05-10 |
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ID=63966339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810945015.3A Active CN108757623B (en) | 2018-08-20 | 2018-08-20 | Stable two-way proportional throttle valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108757623B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109595358B (en) * | 2018-12-27 | 2020-11-10 | 刘永 | Safe type tee bend proportion choke valve structure |
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| CN207583728U (en) * | 2017-12-19 | 2018-07-06 | 山东泰丰智能控制股份有限公司 | Pressure valve electric-hydraulic proportion regulating mechanism |
| CN208793353U (en) * | 2018-08-20 | 2019-04-26 | 刘永 | Proportional throttle valve structure is led in stable type two |
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2018
- 2018-08-20 CN CN201810945015.3A patent/CN108757623B/en active Active
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| Publication number | Publication date |
|---|---|
| CN108757623A (en) | 2018-11-06 |
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