CN105971956B - A kind of pilot-actuated valve - Google Patents
A kind of pilot-actuated valve Download PDFInfo
- Publication number
- CN105971956B CN105971956B CN201610399752.9A CN201610399752A CN105971956B CN 105971956 B CN105971956 B CN 105971956B CN 201610399752 A CN201610399752 A CN 201610399752A CN 105971956 B CN105971956 B CN 105971956B
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- Prior art keywords
- valve
- head
- piston
- heavy caliber
- afterbody
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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
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
- F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve
-
- 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
- F15B13/027—Check valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The present invention relates to a kind of pilot-actuated valve, it is characterised in that：Including valve body, there is heavy caliber portion and small-bore portion in valve body, heavy caliber portion is threaded with blind nut, has the first damping hole in blind nut；Nonreturn valve core, in heavy caliber portion simultaneously, nonreturn valve core are held by the first spring；Piston is controlled, there is head and afterbody, the diameter on head is more than the diameter of afterbody, and head is in the portion of small-bore, and afterbody activity passes through nonreturn valve core, controls and cushion chamber is formed between the head of piston and nonreturn valve core, and controlling in the afterbody of piston has the second damping hole；To promote the push rod of balanced valve control valve element, the end of push rod and the head contact of control piston, second spring is provided with the portion of small-bore.It is it is a kind of it is rational in infrastructure, can stability contorting balance valve core aperture, the pilot-actuated valve of the fluctuation that is not pressurized interference.
Description
Technical field
The present invention relates to a kind of pilot-actuated valve, a kind of especially control hydro-cushion valve core aperture that can stablize
Pilot-actuated valve.
Background technology
In the swing arm and receipts arm system of concrete mixer, commonly used balanced valve carries out hydraulic locking, to ensure arm support
Can reliably it stop at an arbitrary position.Wherein, balanced valve is the crucial Hydraulic Elements of load control system and hydraulic pressure load bearing system,
The performance quality of balanced valve directly affects the running quality of main frame.And with the increasing of concrete mixer job requirements difficulty, it is right
The sealing of balanced valve, self-locking performance, the requirement more and more higher of stationarity and multifunctionality, the power density of balanced valve itself
It is increasing.With the continuous refreshing of operation height, the operating pressure of pumping vehicle arm rack system is also constantly soaring.In this context,
How to improve boom system of concrete pump truck safety work performance turns into research focus.
Common a kind of load using balanced valve that Fig. 4 is shown in the boom system for concrete mixer controls liquid
Pressure system.Its operation principle is：When reversal valve 3 ', which is switched to load, declines working position, the A mouths of reversal valve 3 ' are fuel-displaced, and fluid enters
Entering the rod chamber Y of arm support oil cylinder, part fluid enters liquid controling cavity (plunger shaft) Pil of balanced valve through Px mouths and damping hole 1 ', from
And balanced valve 2 ' is opened, rodless cavity W C mouth and V mouth and the B mouth oil return box T of reversal valve 3 of the fluid through balanced valve 2 ' then weigh
Thing G declines；When reversal valve 3, which is switched to load, rises working position, B mouths are fuel-displaced, and fluid is through the check valve (balance in balanced valve 2 '
The agent structure of valve generally comprises the overflow valve and check valve of parallel connection, as shown in Figure 1) enter oil cylinder rodless cavity W, rod chamber Y's
A oil return box T, weight G rising of the fluid through reversal valve 3 '.When reversal valve 3 ' does not switch, balanced valve 2 ' is then closed, and seals up C mouths
With oil cylinder rodless cavity W fluid, weight G is kept in desired position.
A variety of deficiencies and defect be present in the hydraulic system in Fig. 4.Such as when being transferred to fast operating shelves, the liquid on working connection
Force feed can quickly be increased by the pressure of Px mouths with flow, can be to the conventional pilot-actuated valve of balanced valve when balanced valve 2 ' is opened
Part build-up of pressure impact, this impact may cause balanced valve to be opened suddenly, so as to cause equipment job insecurity.In addition Fig. 4
In balanced valve control pressure narrow range, pressure and flowed fluctuation are big, and balanced valve opening process micro-control and stability are poor.Balance
This control pressure fluctuation of valve can cause the aperture of balanced valve 2 ' to produce change with control flowed fluctuation so that in arm support oil cylinder
Piston position be difficult to be maintained on exact position.Therefore, the balanced valve in very long arm support oil cylinder easily occurs
A kind of unstable situation, cause the uncontrollability of equipment and make equipment be operated in it is dangerous in the state of.
The content of the invention
The technical problems to be solved by the invention be for above-mentioned state of the art and provide it is a kind of it is rational in infrastructure, can
Stability contorting balances valve core aperture, the pilot-actuated valve of the fluctuation that is not pressurized interference.
Technical scheme is used by the present invention solves above-mentioned technical problem：A kind of pilot-actuated valve, it is characterised in that：Bag
Valve body is included, there is stepped channel in valve body, stepped channel has heavy caliber portion and small-bore portion, and the end of valve body is run through in heavy caliber portion
End, heavy caliber portion are threaded with blind nut, first damping hole in blind nut with the connection external world and heavy caliber portion；Nonreturn valve core,
Valve body axial slip, nonreturn valve core it can be held relatively in the heavy caliber portion and by the first spring to keep blocking aperture
The trend of footpath portion import；It can control piston that there is head and afterbody, the diameter on head with respect to the control piston of valve body axial slip
More than the diameter of afterbody, in the small-bore portion, afterbody activity passes through the nonreturn valve core, controls the head of piston on head
Cushion chamber is formed between nonreturn valve core, controls second resistance in the afterbody of piston with connection heavy caliber portion and the cushion chamber
Buddhist nun hole；To promote the push rod of balanced valve control valve element, the end of push rod and the head contact of control piston, small-bore is set in portion
Having makes push rod keep the second spring for promoting control piston towards blind nut direction axial direction mobile trend.
First damping hole is for the benefit of set, is provided with above-mentioned blind nut and connects the extraneous first passage with heavy caliber portion, first
Passage internal thread is connected with the first damping block, and first damping hole is arranged on the first damping block.
Second damping hole is for the benefit of set, and second that heavy caliber portion and cushion chamber are provided with the afterbody of above-mentioned control piston is logical
Road, second channel internal thread are connected with the second damping block, and second damping hole is arranged on the second damping block.
Further improve, the head of above-mentioned control piston is provided with cavity, and the end of push rod has annular shoulder block portion, annular gear
Shoulder contacts with the bottom surface of cavity, and described second spring one end is resisted against the other end in annular shoulder block portion and is resisted against stepped channel
The inner top surface in small-bore portion.
Compared with prior art, the advantage of the invention is that：
1st, when the oil pressure px for entering pilot-actuated valve is flown up, fluid first enters stepped channel by the first damping hole
Heavy caliber portion, in heavy caliber portion pressure p1 rising promote control piston to move to right；The situation that pressure p 1 in heavy caliber portion rises
Lower control piston can move right, but (because the presence of the second damping hole, the pressure p 2 in cushion chamber rises phase for somewhat one movement
Rising to pressure p1 in heavy caliber portion has certain delay), buffering cavity pressure p2 declines at once, serves prevention control and lives
The effect quickly moved to right is filled in, only when the oil pressure px for entering pilot-actuated valve persistently rises, fluid persistently flows through the second damping hole
Entering cushion chamber causes the oil pressure in cushion chamber to continue to rise, and control piston just may proceed to move to right, and thus serves and control is pressed
The cushioning effect of fluctuation, control piston movement are more steady.
2nd, the diameter on head is more than the diameter of afterbody, and head and afterbody have difference in areas, can cause pressure oscillation and shake
Dynamic amplitude amplification, compressive resistance fluctuating nature are superior.(this is it is to be understood that assume the area S2=2* afterbodys on head
Area S1, if fluid is applied directly on the area S2 on head, 0.3MPA pressure oscillation can causes balanced valve control
Valve element is moved to the position for producing vibration, because the area S1 of afterbody is small, the amplitude of such pressure oscillation will reach
0.6MPA)。
3rd, when the oil pressure px for entering pilot-actuated valve declines suddenly, the pressure p 1 in heavy caliber portion is fallen before, and control is lived
Plug is moved to the left, but piston one moves to left, and buffering cavity pressure p2 pressure will rise, and serves the work for hindering control piston movement
With.But buffering that need not be too big when being closed because of balanced valve, by the cooperation of check valve and the first spring, can be controlled
For cushion chamber internal pressure p2 with the pressure p 1 in heavy caliber portion when certain pressure difference is reached, buffering cavity pressure p2 pressure passes through list
Quickly opened to valve, realize quick closedown.
Brief description of the drawings
Fig. 1 is the structure sectional view of the embodiment of the present invention；
Fig. 2 is the principle schematic of the embodiment of the present invention；
Fig. 3 is the principle schematic that the embodiment of the present invention is applied in balanced valve；
Fig. 4 is that the common load using balanced valve being currently used in the boom system of concrete mixer controls hydraulic pressure system
System.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
As illustrated, it is a preferred embodiment of the present invention.
A kind of pilot-actuated valve, including
Valve body 1, valve body 1 is interior to have stepped channel, and stepped channel has heavy caliber portion 11 and small-bore portion 12, heavy caliber portion
11 run through the end of valve body 1, and heavy caliber portion 11 is threaded with blind nut 2, and blind nut 2 is interior extraneous and heavy caliber portion 11 with connecting
First damping hole 81；The extraneous first passage 21 with heavy caliber portion 11 of connection, the connection of the internal thread of first passage 21 are provided with blind nut 2
There is the first damping block 8, first damping hole 81 is arranged on the first damping block 8.
Nonreturn valve core 3, and can be with respect to the axial slip of valve body 1 in the heavy caliber portion 11, and the nonreturn valve core 3 is by first
Spring 4 is held to keep blocking the trend of the import of small-bore portion 12, and the first spring 4 is located in heavy caliber portion 11.
Can control piston 5 that there is head 51 and afterbody 52 with respect to the control piston 5 of the axial slip of valve body 1, head 51 it is straight
Footpath D1 is more than the diameter D2 of afterbody 52, and in small-bore portion 12, the activity of afterbody 52 passes through the nonreturn valve core 3, tail on head 51
Endoporus coordinates for gap between portion 52 and inner elements of check valve 2, the obstructed oil of this gap.Control oil is flowed into by damping hole 1, is first applied to
Piston leading portion D1 parts are controlled, being then flowed into cavity volume 9 by damping hole 2 is applied on the annulus area that D2 and D1 formed.Control
Cushion chamber 10 is formed between the head 51 of piston and nonreturn valve core 3, controlling in the afterbody 52 of piston has connection heavy caliber portion 11
With the second damping hole 91 of the cushion chamber 10；Control and connection heavy caliber portion 11 and cushion chamber 10 are provided with the afterbody 52 of piston
Second channel 521, the internal thread of second channel 521 are connected with the second damping block 9, and second damping hole 91 is arranged on the second damping
On block 9.It can only be connected between heavy caliber portion 11 and cushion chamber 101 by the second damping hole 91.
To promote balanced valve control valve element push rod 6, balance valve core is not shown in drawing, the end of push rod 6 with
The head 51 of control piston contacts, and the head end activity of push rod 6 passes the roof in small-bore portion 12, and being provided with small-bore portion 12 makes top
Bar 6 keeps the second spring 7 for promoting control piston 5 towards the direction axial direction mobile trend of blind nut 2.
The head 51 of control piston is provided with cavity 511, and the end of push rod 6 has annular shoulder block portion 61, annular shoulder block portion 61
Contacted with the bottom surface of cavity 511, described one end of second spring 7 is resisted against the other end in annular shoulder block portion 61 and is resisted against small-bore portion
12 inner top surface.
The operation principle and process of this pilot-actuated valve are as follows：
1st, when balance valve core reaches balanced steady state, into the oil pressure px=heavy calibers portion of pilot-actuated valve
Pressure p 2 in pressure p 1=cushion chambers, balanced valve valve core opening is stable, and control piston position is fixed.
2nd, when the oil pressure px for entering pilot-actuated valve is flown up, fluid first enters stepped channel by the first damping hole 81
Heavy caliber portion 11, in heavy caliber portion 11 pressure p1 rising promote control piston to move to right；In pressure p 1 in heavy caliber portion 11
Piston is controlled to move right in the case of rising, but somewhat one movement is because the presence of the second damping hole 91, in cushion chamber 10
Risings that pressure p 2 rises pressure p1 in relative heavy caliber portion 11 has certain delay, pressure p2 declines at once in cushion chamber 10,
The effect for preventing control piston 5 from quickly moving to right is served, only when the oil pressure px for entering pilot-actuated valve persistently rises, fluid passes through
Second damping hole continues to flow into cushion chamber and causes the oil pressure in cushion chamber to continue to rise, and control piston just may proceed to move to right, so
The cushioning effect to control pressure fluctuation is just served, control piston movement is more steady.
3rd, the diameter on head is more than the diameter of afterbody, and head and afterbody have difference in areas, can cause pressure oscillation and shake
Dynamic amplitude amplification, compressive resistance fluctuating nature are superior.(this is it is to be understood that assume the area S2=2* afterbodys on head
Area S1, if fluid is applied directly on the area S2 on head, 0.3MPA pressure oscillation can causes balanced valve control
Valve element is moved to the position for producing vibration, because the area S1 of afterbody is small, the amplitude of such pressure oscillation will reach
0.6MPA)。
4th, when the oil pressure px for entering pilot-actuated valve declines suddenly, the pressure p 1 in heavy caliber portion is fallen before, and control is lived
Plug is moved to the left, but piston one moves to left, and buffering cavity pressure p2 pressure will rise, and serves the work for hindering control piston movement
With.But buffering that need not be too big when being closed because of balanced valve, by the cooperation of check valve and the first spring, can be controlled
For cushion chamber internal pressure p2 with the pressure p 1 in heavy caliber portion when certain pressure difference is reached, buffering cavity pressure p2 pressure passes through list
Quickly opened to valve, realize quick closedown.
Although the preferred embodiments of the present invention described in detail above, it is to be clearly understood that for this area
Technical staff for, the present invention can have various modifications and variations.That is made within the spirit and principles of the invention appoints
What modification, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (4)
- A kind of 1. pilot-actuated valve, it is characterised in that：IncludingValve body (1), valve body (1) is interior to have stepped channel, and stepped channel has heavy caliber portion (11) and small-bore portion (12), big mouth The end of valve body (1) is run through in footpath portion (11), and heavy caliber portion (11) are threaded with blind nut (2), have connection extraneous in blind nut (2) With first damping hole (81) of heavy caliber portion (11)；Nonreturn valve core (3), in the heavy caliber portion (11) and can with respect to valve body (1) axial slip, the nonreturn valve core (3) by First spring (4) is held to keep blocking the trend of small-bore portion (12) import；It can control piston (5) that there is head (51) and afterbody (52), head with respect to the control piston (5) of valve body (1) axial slip (51) diameter (D1) is more than the diameter (D2) of afterbody (52), and head (51) are interior located at the small-bore portion (12), afterbody (52) Activity passes through the nonreturn valve core (3), controls and cushion chamber (10) is formed between the head (51) of piston and nonreturn valve core (3), control There is the second damping hole (91) of connection heavy caliber portion (11) and the cushion chamber (10) in the afterbody (52) of piston processed；To promote the push rod (6) of balanced valve control valve element, the end of push rod (6) is pushed up with controlling the head (51) of piston to contact The head end activity of bar (6) passes the roof of small-bore portion (12), and being provided with small-bore portion (12) makes push rod (6) keep promoting control Second spring (7) of the piston (5) towards blind nut (2) direction axial direction mobile trend.
- 2. pilot-actuated valve according to claim 1, it is characterised in that：It is extraneous and big that connection is provided with the blind nut (2) The first passage (21) in bore portion (11), first passage (21) internal thread are connected with the first damping block (8), first damping hole (81) it is arranged on the first damping block (8).
- 3. pilot-actuated valve according to claim 1, it is characterised in that：The company of being provided with the afterbody (52) of the control piston Logical heavy caliber portion (11) and the second channel (521) of cushion chamber (10), second channel (521) internal thread are connected with the second damping block (9), second damping hole (91) is arranged on the second damping block (9).
- 4. pilot-actuated valve according to claim 1, it is characterised in that：The head (51) of the control piston is provided with cavity (511), the end of push rod (6) has annular shoulder block portion (61), and annular shoulder block portion (61) contacts with the bottom surface of cavity (511), institute State second spring (7) one end to be resisted against on annular shoulder block portion (61), the other end is resisted against the inner top surface of small-bore portion (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610399752.9A CN105971956B (en) | 2016-05-31 | 2016-05-31 | A kind of pilot-actuated valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610399752.9A CN105971956B (en) | 2016-05-31 | 2016-05-31 | A kind of pilot-actuated valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105971956A CN105971956A (en) | 2016-09-28 |
| CN105971956B true CN105971956B (en) | 2017-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610399752.9A Active CN105971956B (en) | 2016-05-31 | 2016-05-31 | A kind of pilot-actuated valve |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061073B (en) * | 2017-12-19 | 2019-11-26 | 江苏佳佩环保机械设备有限公司 | Pressure-control valve and hydraulic system including the pressure-control valve |
| CN108131346B (en) * | 2017-12-21 | 2019-11-22 | 浙江达柏林阀门有限公司 | A kind of threeway one-way speed-regulating valve |
| DE112019007746T5 (en) * | 2019-09-26 | 2022-06-09 | Bosch Rexroth (Beijing) Hydraulic Co., Ltd. | Back pressure valve and hydraulic switching valve |
| CN111852975B (en) * | 2020-06-24 | 2022-09-09 | 合肥长源液压股份有限公司 | Buffer valve for reducing start-stop impact of hydraulic actuating mechanism |
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| JP2008002570A (en) * | 2006-06-22 | 2008-01-10 | Bosch Rexroth Corp | Pilot check valve and fluid pressure circuit equipped therewith |
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| CN204041597U (en) * | 2014-08-19 | 2014-12-24 | 徐州徐工液压件有限公司 | A kind of temperature correction valve and there is the crane telescopic system of temperature compensation function |
| CN102734248B (en) * | 2012-07-18 | 2015-05-27 | 严光贤 | Overflow valve |
| CN204553818U (en) * | 2015-03-31 | 2015-08-12 | 中国船舶重工集团公司第七一一研究所 | Pressure-adjustable solenoid electric valve and adopt its speed governing bending moment transmission device hydraulic system |
| CN103742473B (en) * | 2013-12-31 | 2015-12-09 | 浙江大学 | Split type pilot load control valve |
| CN103122880B (en) * | 2011-11-18 | 2016-05-04 | 广西柳工机械股份有限公司 | Adjustable pilot-operated pressure-reducing valve |
| CN104358728B (en) * | 2014-11-04 | 2016-05-04 | 浙江大学 | Relief function is integrated in to the secondary loads control valve of guide's spool |
-
2016
- 2016-05-31 CN CN201610399752.9A patent/CN105971956B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6073654A (en) * | 1998-03-28 | 2000-06-13 | Dbt Deutsche Bergbau-Technik Gmbh | Hydraulically trippable check valve for underground mine support hydraulics |
| CN2804450Y (en) * | 2005-06-01 | 2006-08-09 | 刘恒海 | Balancing valve |
| JP2008002570A (en) * | 2006-06-22 | 2008-01-10 | Bosch Rexroth Corp | Pilot check valve and fluid pressure circuit equipped therewith |
| CN103122880B (en) * | 2011-11-18 | 2016-05-04 | 广西柳工机械股份有限公司 | Adjustable pilot-operated pressure-reducing valve |
| CN102562699B (en) * | 2011-12-16 | 2014-04-30 | 中联重科股份有限公司 | Balance valve, hydraulic cylinder telescopic control loop and crane |
| CN102734248B (en) * | 2012-07-18 | 2015-05-27 | 严光贤 | Overflow valve |
| CN103742473B (en) * | 2013-12-31 | 2015-12-09 | 浙江大学 | Split type pilot load control valve |
| CN204041597U (en) * | 2014-08-19 | 2014-12-24 | 徐州徐工液压件有限公司 | A kind of temperature correction valve and there is the crane telescopic system of temperature compensation function |
| CN104358728B (en) * | 2014-11-04 | 2016-05-04 | 浙江大学 | Relief function is integrated in to the secondary loads control valve of guide's spool |
| CN204553818U (en) * | 2015-03-31 | 2015-08-12 | 中国船舶重工集团公司第七一一研究所 | Pressure-adjustable solenoid electric valve and adopt its speed governing bending moment transmission device hydraulic system |
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| Publication number | Publication date |
|---|---|
| CN105971956A (en) | 2016-09-28 |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Qian Zhengnan Inventor after: Gao Guoliang Inventor after: Wang Wei Inventor before: Chen Yanyan |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20171016 Address after: 224043 Dagang Town of Jiangsu province Yancheng City salt District Xitan Yang Xiang Applicant after: YANCHENG JINRUI PETROLEUM MACHINERY CO., LTD. Address before: 315000 Zhejiang city of Ningbo province high tech Zone Juxian Road No. 555 building 035 room 18-1 013 station Applicant before: Ningbo Wen fan electrical and Mechanical Technology Development Co., Ltd. |
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