CN107939768A - A kind of normally closed hydraulic control pressure reducing valve of board-like threeway - Google Patents
A kind of normally closed hydraulic control pressure reducing valve of board-like threeway Download PDFInfo
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- CN107939768A CN107939768A CN201810017048.1A CN201810017048A CN107939768A CN 107939768 A CN107939768 A CN 107939768A CN 201810017048 A CN201810017048 A CN 201810017048A CN 107939768 A CN107939768 A CN 107939768A
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- China
- Prior art keywords
- spool
- valve body
- spring
- board
- outlet
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Classifications
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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
- F15B13/025—Pressure reducing valves
Abstract
A kind of normally closed hydraulic control pressure reducing valve of board-like threeway, contains cover board（1）, spool（2）, valve body（3）, spring（4）, spring bumper cover（5）And entrance P, outlet A, oil return inlet T, control mouth X, export between entrance and oil return opening, spool, cover board, valve body three form control chamber（16）, control chamber connects with control mouth, and spool, spring bumper cover, valve body three form spring cavity（6）It is equipped with spool with exporting the internal holes being connected, spring cavity is communicated with internal holes, spool is coordinated with valve body by minimal clearance, spool is more than spool and spring cavity mating surface diameter with control chamber mating surface diameter, spring is installed in spring cavity, and cover board and spring bumper cover are all installed on valve body, and entrance, outlet, oil return opening and control mouth are all arranged on valve body.The present invention can realize the zero-pressure state of outlet, solve the complete zero-pressure of the single spur track when a pumping plant drives multiple loads, other branches are not impacted.
Description
Technical field
The present invention relates to a kind of hydraulic control valve, more particularly to a kind of board-like normally closed hydraulic control pressure reducing valve of threeway.
Background technology
Pressure reducing valve is known as according to the hydraulic valve that " negative-feedback of series connection decompression type pressure " principle designs, pressure reducing valve is used to control
The branch pressure of hydraulic system processed, makes its output pressure be less than system pressure.Pressure reducing valve of the prior art divides Direct Action Type, guide
Formula, the control oil of piloted reducer can be by pressure reducing valve oil inside offering, also can be from fuel feeding outside pressure reducing valve.
At present, domestic and international pressure reducing valve is valve open in usual, in the premise that system pressure remains unchanged based on two logical pressure reducing valves
Under, outlet pressure can only be reduced to minimal pressure force value, and the minimal pressure force value is generally higher than 0.5~0.7MPa, can not realize and subtract
Pressure valve outlet pressure is zero.
The three-way pressure reducing valves such as 3DR, PPXB of external certain company production, also belong to valve open in usual, more conventional two logical pressure reducing valves
Increase oil return window at one, in order to when delivery outlet pressure passively increases, the pressure of delivery outlet is limited, it is really logical two
The outlet of pressure reducing valve increases an overflow valve, and such overflow valve can not also realize that decompression valve outlet pressure is zero.
The method connected using two logical pressure reducing valves with reversal valve more at present, realizes load pressure decompression and zero-pressure.But this
Method manufacture cost is higher, particularly evident to the hydraulic system of big flow.
When a pumping plant drives multiple loads, single load needs to be depressurized to zero-pressure completely and cannot influence other loads
In the case of, conventional vacuum valve is difficult to realize simple, quick control, such as multichannel aircraft fatigue testing stand, all kinds of dynamic hydraulics
Testing machine, static-force hydraulic testing equipment etc..
The content of the invention
The purpose of the present invention is want to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of board-like normally closed hydraulic control of threeway
Pressure reducing valve, the pressure reducing valve can realize outlet zero-pressure state, can solve the complete of when the drive multiple loads of pumping plant single spur track
Zero-pressure, control method is simple, easy to use.
Technical solution is used by realize the above-mentioned purpose of the present invention：A kind of normally closed hydraulic control pressure reducing valve of board-like threeway,
It is structurally characterized in that containing cover board, spool, valve body, spring, spring bumper cover and entrance, outlet, three operation windows of oil return opening and
One window control mouth for being used to control, exports between entrance and oil return opening, and spool, cover board, valve body three form control
Chamber, control chamber are connected with control mouth, and spool, spring bumper cover, valve body three form spring cavity, are communicated in spool equipped with n interior
Portion hole, internal holes are connected with outlet, and spring cavity is communicated with internal holes, so as to form pressure negative-feedback, spool passes through with valve body
Minimal clearance coordinates, and there are relative motion, spool and the diameter dimension of control chamber mating surface to match somebody with somebody more than spool with spring cavity for the two
The diameter dimension in conjunction face, makes the effective compression area of control chamber be more than the effective compression area of spring cavity, and spring is installed in spring cavity,
Spring provides precompression to spool, and cover board and spring bumper cover are all installed on valve body, and entrance is arranged on valve body, outer for connecting
The oil-feed port of portion's pumping plant, outlet are arranged on valve body, and for connecting external loading, oil return opening is arranged on valve body, for connecting
The oil return pipe of exterior pumping plant, control mouth are arranged on valve body, for connecting exterior oil route controller.
The quantity for the internal holes being equipped with the spool is the Arbitrary Digit of n >=2, preferably 3.
The spool is coordinated with valve body by minimal clearance, and usual gap is 5 μm~12 μm.
The cover board, spring bumper cover are installed on valve body by screw I, and cover board passes through 0 shape circle I and valve seal, bullet
Spring cover board passes through O-ring IV and valve seal.
When spool is from control chamber end movement to spring cavity end, the connected relation of three operation windows has three kinds of shapes
State, is followed successively by：Outlet oil return opening do not connect entrance, outlet do not connect oil return opening do not connect yet entrance, outlet do not connect back
Hydraulic fluid port connects entrance.Whenever entrance does not connect with oil return opening, and whenever all control mouth and its excess-three operation window
Do not connect.
Default conditions of the present invention（Control mouth pressure is less than 0.2MPa）Under, outlet pressure is zero-pressure, at this time outlet and oil return
Mouth is connected, and inlet pressure oil is closed, and by controlling the pressure of control mouth, can realize the decompression of outlet output pressure, decompression
Scope covers system maximum pressure.
Relative to the prior art, its advantage and effect are：
1st, when being closed using default entry, exporting the working status connected with oil return opening, after control mouth decompression, outlet returns
Hydraulic fluid port realizes outlet zero-pressure, and at this time, entrance is closed, and does not influence the pressure of other branches.
2nd, it is controlled using independent control mouth.The hydraulic circuit of smaller flow is only needed to control the hydraulic pressure of larger flow
The pressure change of oil circuit.In use, the exterior control oil circuit device of control mouth connection, can by exterior conventional control oil circuit device
Easily to realize a variety of pressure control modes, the function expansibility of the normally closed hydraulic control pressure reducing valve of board-like threeway of the invention is preferable,
And pressure oscillation is steady, impact is minimum, effectively protects hydraulic system, improves the security of hydraulic system.
3rd, the present invention is compact-sized, and easy for installation, maintainability is preferable, and range of regulation is high（It is adjustable to 35MPa）, be conducive to reality
Now automatically control.
Brief description of the drawings
Fig. 1 is the structure diagram of preferred embodiment.
Embodiment
Do further detailed description to the present invention with the example of specific implementation below in conjunction with the accompanying drawings, but the implementation
Example should not be construed in a limiting sense, and the detailed description to non-limiting example made in conjunction with the accompanying drawings, can make this hair
Bright technical characteristic, objects and advantages will become apparent.
From figure 1 it appears that the present invention contains cover board 1, spool 2, valve body 3, spring 4, spring bumper cover 5 and entrance P, goes out
Mouth A, three operation windows of oil return inlet T and one are used for window --- the control mouth X controlled, and outlet A is located at entrance P and oil return inlet T
Between, spool 2, cover board 1,3 three of valve body form control chamber 16, and control chamber 16 connects with control mouth X, spool 2, spring bumper cover 5,
3 three of valve body forms spring cavity 6, and three internal holes are equipped with spool 2：Internal holes I 10, internal holes II 12, internal holes III 9, this
Three internal holes are connected, and internal holes II 12 are connected with outlet A, and spring cavity 6 is communicated with internal holes III 9, so that spring
Chamber 6 is connected with outlet A, forms pressure negative-feedback, and spool 2 is coordinated with valve body 3 by minimal clearance（Gap be generally 5 μm~
12μm）, the two is there are relative motion, and spool 2 is with 16 mating surface diameter dimension of control chamber more than spool 2 and 6 mating surface of spring cavity
Diameter dimension, makes 16 effective compression area of control chamber be more than 6 effective compression area of spring cavity, and spring 4 is installed in spring cavity 6,
Spring 4 provides precompression to spool 2, and cover board 1 and spring bumper cover 5 are all installed on valve body 3, and entrance P is arranged on valve body 3, is used
In the oil-feed port of the exterior pumping plant of connection, outlet A is arranged on valve body 3, and for connecting external loading, oil return inlet T is arranged at valve body
On 3, for connecting the oil return pipe of exterior pumping plant, control mouth X is arranged on valve body 3, for connecting exterior oil route controller.
When spool 2 moves to 6 end of spring cavity from 16 end of control chamber (16 left end of control chamber in Fig. 1)（Spring cavity in Fig. 1
6 low order ends）, the connected relation of three operation windows has three kinds of states, is followed successively by：Outlet A connection oil return inlet T do not connect entrance P,
Outlet A does not connect that oil return inlet T does not connect entrance P yet, outlet A does not connect oil return inlet T connection entrance P.
The cover board 1, spring bumper cover 5 are installed on valve body 3 by screw I 7, and cover board 1 passes through 0 shape circle I 15 and valve body 3
Sealing, spring bumper cover 5 are sealed by O-ring IV 8 and valve body 3.
The present invention is additionally provided with O-ring II 13, O-ring III 14 for connecting the mounting surface sealing using equipment.This hair
It is bright to be used in use, being installed on by screw II 11 in equipment.
The operation principle of the present invention can be analyzed in two kinds of situation：
1. realize outlet A zero-pressure states
When control mouth X pressure is less than 0.2MPa, control mouth X pressure acts on the oil pressure that control chamber 16 forms control chamber 16,
The insufficient pressure is to overcome 4 precompression of spring that spring 4 produces, and 2 holding position of spool is constant at this time, in the end of control chamber 16
End（16 high order end of control chamber in Fig. 1）.Hydraulic oil enters from entrance P, and spool 2 and 3 clearance fit of valve body seal, cause entrance P with
Outlet A is not communicated with, and is exported A at this time and is connected with oil return inlet T, so as to fulfill the zero-pressure state of outlet A.
2. realize outlet A decompressions
When control mouth X pressure is in 0.2MPa to a certain value between system pressure, control chamber 16 is controlled the oil pressure of mouthful X
Form the oil pressure of control chamber 16, which overcomes 4 precompression of spring and drives spool 2 to be moved to spring cavity 6, make outlet A with
Oil return inlet T is closed, outlet A is connected with entrance P, and establishes pressure in outlet A, and the pressure for exporting A passes through the internal holes of spool 2
I 10, internal holes II 12, internal holes III 9 feed back to spring cavity 6, form the oil pressure of spring cavity 6.When " the oil pressure of control chamber 16
Equal to the sum of the oil pressure of spring cavity 6 and 4 power of spring " when, spool 2 is in equilibrium state, and maintains the pressure of outlet A motionless,
Realize the decompression output of outlet A.Adjustment control mouth X pressure values, the pressure value for exporting A change and reach stable therewith.
Control mouth X is in system maximum pressure（It is i.e. consistent with the pressure of entrance P）When, when control chamber 16, spring cavity 6 at the same time
It is subject to system maximum pressure to act on, because effective compression area of control chamber 16 is more than effective compression area of spring cavity 6, makes control
The oil pressure of chamber 16（In Fig. 1 to the right）More than the oil pressure of spring cavity 6（In Fig. 1 to the left）, spool 2 moves and moves to spring cavity 6
Move to the end of spring cavity 6（6 low order end of spring cavity in Fig. 1）, compared to hydraulic oil in two chambers（Spring cavity 6, control chamber 16）Area
The power that difference produces, 4 precompression of spring can be neglected.Entrance P is connected with outlet A completely at this time, while exports A and oil return inlet T
Do not connect（Clearance fit seals）, export A and reach maximum pressure output state.
The quantity for the internal holes being equipped with the spool 2 can also be the Arbitrary Digit of n >=2.
The present invention is used on the mounting surface of equipment in use, the present invention is installed on, and is had on these mounting surfaces corresponding
Entrance P, export A, oil return inlet T, control mouth X and be less than or equal to for fixed threaded hole, the roughness Ra on the surface of mounting surface
1.6um.The oil-feed port for the exterior pumping plant that the entrance P is connected, the external loading that outlet A is connected, oil return inlet T connect
The oil return pipe of the exterior pumping plant connect, the exterior oil route controller that control mouth X is connected all is existing equipment, its connection mode
And as it is known to those skilled in the art that no longer repeat.
Claims (5)
- A kind of 1. normally closed hydraulic control pressure reducing valve of board-like threeway, it is characterized in that containing cover board（1）, spool（2）, valve body（3）, spring（4）、 Spring bumper cover（5）And entrance（P）, outlet（A）, oil return opening（T）Three operation windows and a window control mouth for being used for control （X）, outlet（A）Positioned at entrance（P）With oil return opening（T）Between, spool（2）, cover board（1）, valve body（3）Three forms control chamber （16）, control chamber（16）With control mouth（X）Connection, spool（2）, spring bumper cover（5）, valve body（3）Three forms spring cavity（6）, Spool（2）It is interior to be equipped with the n internal holes communicated, internal holes and outlet（A）It is connected, spring cavity（6）Communicated with internal holes, so that Form pressure negative-feedback, spool（2）With valve body（3）Coordinated by minimal clearance, there are relative motion, spool for the two（2）With control Chamber processed（16）The diameter dimension of mating surface is more than spool（2）With spring cavity（6）The diameter dimension of mating surface, makes control chamber（16）Have Effect compression area is more than spring cavity（6）Effective compression area, spring（4）Installed in spring cavity（6）It is interior, spring（4）To spool（2） Precompression, cover board are provided（1）And spring bumper cover（5）All it is installed on valve body（3）On, entrance（P）It is arranged at valve body（3）On, it is used for The oil-feed port of the exterior pumping plant of connection, outlet（A）It is arranged at valve body（3）On, for connecting external loading, oil return opening（T）It is arranged at Valve body（3）On, for connecting the oil return pipe of exterior pumping plant, control mouth（X）It is arranged at valve body（3）On, for connecting exterior oil circuit Control device.
- 2. the normally closed hydraulic control pressure reducing valve of board-like threeway described in accordance with the claim 1, it is characterized in that the spool（2）Inside it is equipped with The quantity of internal holes is the Arbitrary Digit of n >=2.
- 3. the normally closed hydraulic control pressure reducing valve of board-like threeway described in accordance with the claim 2, it is characterized in that the spool（2）Inside it is equipped with The quantity n of internal holes is 3.
- 4. the normally closed hydraulic control pressure reducing valve of board-like threeway described in accordance with the claim 1, it is characterized in that the spool（2）With valve body （3）Fit clearance be 5 μm~12 μm.
- 5. the normally closed hydraulic control pressure reducing valve of board-like threeway described in accordance with the claim 1, it is characterized in that the cover board（1）, spring cup Plate（5）Pass through screw I（7）Installed in valve body（3）On, cover board（1）Pass through 0 shape circle I（15）With valve body（3）Sealing, spring bumper cover （5）Pass through O-ring IV（8）With valve body（3）Sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810017048.1A CN107939768A (en) | 2018-01-09 | 2018-01-09 | A kind of normally closed hydraulic control pressure reducing valve of board-like threeway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810017048.1A CN107939768A (en) | 2018-01-09 | 2018-01-09 | A kind of normally closed hydraulic control pressure reducing valve of board-like threeway |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107939768A true CN107939768A (en) | 2018-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810017048.1A Pending CN107939768A (en) | 2018-01-09 | 2018-01-09 | A kind of normally closed hydraulic control pressure reducing valve of board-like threeway |
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| Country | Link |
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| CN (1) | CN107939768A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015219581A (en) * | 2014-05-14 | 2015-12-07 | 株式会社不二越 | Pressure reducing valve |
| JP2017180641A (en) * | 2016-03-30 | 2017-10-05 | 日立建機株式会社 | Pressure reduction valve unit |
-
2018
- 2018-01-09 CN CN201810017048.1A patent/CN107939768A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015219581A (en) * | 2014-05-14 | 2015-12-07 | 株式会社不二越 | Pressure reducing valve |
| JP2017180641A (en) * | 2016-03-30 | 2017-10-05 | 日立建機株式会社 | Pressure reduction valve unit |
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