CN103104565B - Balance valve - Google Patents
Balance valve Download PDFInfo
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- CN103104565B CN103104565B CN201210538167.4A CN201210538167A CN103104565B CN 103104565 B CN103104565 B CN 103104565B CN 201210538167 A CN201210538167 A CN 201210538167A CN 103104565 B CN103104565 B CN 103104565B
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- chamber
- valve
- spool
- piston
- hydraulic fluid
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Abstract
A balance valve comprises a valve body, an end cover, a plug, a valve core, a valve seat and a piston, wherein the end cover and the plug are respectively connected with the two ends of the valve body in a sealing mode. A third oil port is formed in the rear end of the plug, a filter screen and a damper are arranged at the third oil port, and the valve seat is arranged in a first cavity of the valve body and located between a first oil port and a second port. The front section of the valve core is matched in the end cover in a sliding mode, the rear section of the valve core is matched in a through-hole of the valve seat, an inner cavity which is axially penetrating is formed in the valve core, a steel ball which is matched with the inner cavity of the valve core is arranged in the valve core, a boss for axially limiting the steel ball is arranged in the inner cavity of the valve core, a first spring which is abutted against the steel ball is arranged in the inner cavity of the valve core, and the other end of the first spring is abutted in the end cover. The piston is matched in a second cavity in a sliding mode, the ladder end of the piston penetrates a cavity wall between the first cavity and the second cavity and is matched in the inner cavity of the valve core in a sliding mode, and a one-way throttling device is arranged at the rear end of the piston. The balance valve is simple in structure, compact in size and stable in working.
Description
Technical field
The present invention relates to a kind of hydrovalve, particularly relate to the equilibrium valve be applied in oil hydraulic circuit.
Background technique
In the machinery such as engineering machinery, building machinery in modern times, widely applied the oil hydraulic circuit that hoists, wherein equilibrium valve is the crucial hydraulic element controlling oil hydraulic motor work in hoisting circuit, and the quality of equilibrium valve performance directly affects the performance of main frame.
Existing equilibrium valve is divided into board-like equilibrium valve and cartridge balanced valve two kinds by Placement, in order to reduce installing space in telescopic oil cylinder of crane, improving system reliability, generally adopting cartridge balanced valve.Patent No. ZL01139273.8 name is called that the patent of invention of " a kind of equilibrium valve " provides a kind of equilibrium valve of plug-in type.It comprises main valve, pilot valve, above-mentioned each valve all comprises two chambeies be positioned at before and after spool, and wherein main valve comprises valve pocket, main valve plug, and described valve pocket is cylindrical tube, the outer side surface of valve pocket is provided with the first main hydraulic fluid port A and the second main hydraulic fluid port B, and pilot valve is positioned at main valve plug.This equilibrium valve is owing to can directly insert oil hydraulic cylinder head, due to multiple spring structures that its main spool spring adopts rigidity to differ, mix the skewed slot on main valve plug conical side surface, make control more accurate, sensitive, even if when decompression, pilot valve in main valve plug can close rapidly the oil circuit between the second main hydraulic fluid port and the first main hydraulic fluid port, can prevent load stall from declining, play the effect of a hydraulic lock.
But there is following shortcoming in this equilibrium valve:
1, this balancing valve structure is complicated, required precision is high, the requirement of coaxality is had just to have more than six places between each part, and it is all minimum that being slidably matched of main valve plug and valve pocket, pilot valve and main valve plug locates gap, manufacturing process difficulty is large, during product actual use, spool easily blocks, thus can affect the reliability of host work.
2, to be located at main valve plug (balance valve core) inner for the pilot valve (nonreturn valve core) of this equilibrium valve, main valve plug wired seal request again and between valve pocket, also wired seal request between pilot valve and main valve plug.This just requires that will there be very high hardness at main valve plug conical side surface place, and to prevent the wearing and tearing of part, and main valve plug inner chamber is relative lower again with pilot valve cooperation place hardness.This just proposes very high request to the heat treatment of main valve plug and material, adds processing cost.
3, because the pilot valve of this equilibrium valve is located at main valve plug inside, in order to reduce flow resistance, certainly will will increase the size of pilot valve, the size of main valve plug and valve pocket also will become large in succession, makes the overall dimensions of equilibrium valve bigger than normal.And the diameter of oil hydraulic cylinder is certain, the oversize words of equilibrium valve will make the machining allowance of the plug-in opening on oil hydraulic cylinder less than normal, cause certain difficulty to processing.
4, the damping link of this equilibrium valve inside is few, poor at ambient conditions interference stability inferior, easily produces shake.
Summary of the invention
Technical problem to be solved by this invention is: the above-mentioned shortcoming overcoming prior art, provides that a kind of structure is simple, volume compact, the reliable equilibrium valve of working stability.
The present invention's adopted technological scheme that solves the problem is: a kind of equilibrium valve, comprises and is provided with the first hydraulic fluid port and the second hydraulic fluid port and arranges the piston that the valve body of the tubular of the first chamber and the second chamber, the end cap being sealedly connected on valve body two ends respectively and screw plug, spool, steel ball, valve seat and cover have the second spring vertically; Described screw plug rear end is provided with the 3rd hydraulic fluid port, and described 3rd oil port is provided with filter screen device, damping device, and described valve seat is located in valve body first chamber, and between the first hydraulic fluid port, the second hydraulic fluid port; Described spool leading portion is slidably tied in end cap, the back segment of described spool is matched with in the through hole of valve seat, described spool is provided with the inner chamber axially run through, the first steel ball matched with valve core cavity is provided with in described spool, and described valve core cavity is provided with the boss for carrying out axial limiting to steel ball, described valve core cavity is provided with the first spring offseted with the first steel ball, and the other end of described first spring is butted in end cap; Described piston is sliding to be assigned in the second chamber, and the stepped end of piston rod is slidably tied in the inner chamber of spool through the locular wall the first chamber and the second chamber, and described piston rear end is provided with one-way throttling device.
Compared with prior art, the invention has the advantages that: this balancing valve structure is simple, volume compact, and between each part, coaxality is less, and the place that is slidably matched is less demanding, manufacturing process is simple.This cartridge balanced valve is only provided with a spool, and some the technologic problems related to during without the need to considering main valve plug and pilot valve plug-in mounting, reduce processing cost.And the size of this equilibrium valve more easily ensures, can be plugged in easily into oil hydraulic cylinder head.
As improvement, described one-way throttling device is fixed on the ear end face of piston, and described one-way throttling device comprises the first damper and the second steel ball, matches in the 3rd chamber that the second described steel ball is placed in piston with the valve port of the first damper.Add the damper that screw plug rear end is provided with, this cartridge balanced valve just includes two damping links.The pressure produced after two damping rings flow successively, is pressure after decompression, can improves the stability of equilibrium valve like this, reduce vibrations.
Accompanying drawing explanation
Fig. 1 is the structural representation of equilibrium valve of the present invention.
Fig. 2 is the structural representation of equilibrium valve of the present invention.(when load is risen)
Fig. 3 is the structural representation of equilibrium valve of the present invention.(when load declines)
Fig. 4 is the application hydraulic schematic diagram of equilibrium valve of the present invention.
Shown in Fig. 1-4: 1 end cap, 2 valve bodies, 3 first springs, 4 spring seats, 5 first steel balls, 6 spools, 6.1 boss, 7 valve seats, 8 piston rods, 9 second springs, 10 second steel balls, 11 pistons, 12 first dampers, 13 second dampers, 14 screw plugs, 15 filter screens.
A first hydraulic fluid port, B second hydraulic fluid port, X, the 3rd hydraulic fluid port.
G first chamber, H second chamber, I the 3rd chamber, J the 4th chamber.
A first radial direction through hole, b second radial direction through hole, c third through-hole, d the 4th radial direction through hole, e fifth hole, f the 6th through hole.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are further described.
As shown in Figure 1, a kind of equilibrium valve, comprises and is provided with the first hydraulic fluid port A and the second hydraulic fluid port B and arranges the piston 11 that the valve body 2 of the tubular of the first chamber G and the second chamber H, the end cap 1 being sealedly connected on valve body 2 two ends respectively and screw plug 14, spool 6, steel ball, valve seat 7 and cover have the second spring vertically; Described screw plug 14 rear end is provided with the 3rd hydraulic fluid port X, and described 3rd hydraulic fluid port X place is provided with filter screen 15, second damper 13, and described valve seat 7 is located in valve body 2 first chamber G, and between the first hydraulic fluid port A, the second hydraulic fluid port B; Described spool 6 leading portion is slidably tied in end cap 1, the back segment of described spool 6 is matched with in the through hole of valve seat 7, described spool 6 is provided with the inner chamber axially run through, the first steel ball 5 matched with spool 6 inner chamber is provided with in described spool 6, and described spool 6 inner chamber is provided with the boss for carrying out axial limiting to steel ball, described spool 6 inner chamber is provided with the first spring 3 offseted with the first steel ball 5, and the other end of described first spring 3 is butted in end cap 1; Described piston 11 is sliding to be assigned in the second chamber H, and the stepped end of piston rod 8 is slidably tied in the inner chamber of spool 6 through the locular wall the first chamber G and the second chamber H, and described piston 11 rear end is provided with one-way throttling device.
Described one-way throttling device is fixed on the ear end face of piston 11, and described one-way throttling device comprises the first damper 12 and the second steel ball 10, matches in the 3rd chamber I that the second described steel ball 10 is placed in piston 11 with the valve port of the first damper 12.
The periphery that described spool 6 back segment matches with the through hole of valve seat 7 is conical surface, and the outer conical surface of described spool 6 and valve seat 7 linear sealing.
Be provided with the first radial direction through hole a of connection second hydraulic fluid port B and spool 6 inner chamber in the middle part of described spool 6, its rear end is provided with the second radial direction through hole b of connection first hydraulic fluid port A and spool 6 inner chamber.
Locular wall between first chamber G of described valve body 2 and the second chamber H is provided with the third through-hole c of connection two chamber.
The 4th radial direction through hole d of the 3rd chamber I being communicated with valve body 2 second chamber H and piston 11 is provided with in the middle part of described piston 11.
Fig. 4 is the application hydraulic schematic diagram of equilibrium valve of the present invention, first hydraulic fluid port A of this equilibrium valve is connected with the hydraulic fluid port A1 of selector valve, second hydraulic fluid port B is connected with hydraulic rod rodless cavity B1, the hydraulic fluid port B3 of selector valve is connected with rod chamber B2, the 3rd hydraulic fluid port X of oil hydraulic cylinder respectively, other two hydraulic fluid port P and O cut-in pressure oil sources and the oil sump tank respectively of selector valve.
Working principle of the present invention is as shown in Figure 2,3:
1, when load is risen, selector valve is beaten in left position, hydraulic oil enters valve body 2 from the first hydraulic fluid port A, the third through-hole c that on the one hand hydraulic oil is provided with by the locular wall between the first chamber G of valve body 2 and the second chamber H enters the second chamber H, the 3rd chamber I of piston is entered again by the 4th radial direction through hole d on piston 6, and the second steel ball 10 is withstood on the valve port of the first damper 12, block the passage being entered the 4th chamber J by the 3rd chamber I.On the other hand, hydraulic oil acts on impacting force spool 6 overcoming the first spring 3, and spool 6 is moved to left, and at this moment, hydraulic oil can flow to the second hydraulic fluid port B by the first hydraulic fluid port A, and enters the rodless cavity B1 of oil hydraulic cylinder, thus promotes load rising.
2, when load declines, selector valve is got to right position, hydraulic oil enters the 4th chamber J by the 3rd hydraulic fluid port X by the 6th through hole f on filter screen 15 and the second damper 13.At this moment, the fifth hole e of part hydraulic oil on the first damper 12 backs down the 3rd chamber I that the second steel ball 10 flows into piston 11, the 4th radial direction through hole d again by being provided with in the middle part of piston 11 flows into the second chamber H, the third through-hole c be provided with by the locular wall between valve body 2 first chamber G and the second chamber H again flows into the first hydraulic fluid port A, at this moment the pressure of the hydraulic oil of the first hydraulic fluid port A is the pressure that the hydraulic oil of the 3rd hydraulic fluid port X produces after two damper throttlings, be pressure after decompression in fact, the stability of equilibrium valve can be improved like this.Other a part of hydraulic oil of the 4th chamber J acts on piston 11, and the active force promotion piston 11 overcoming the second spring 9 moves to left, piston rod 8 external part of piston 11 first pushes up the first steel ball 5 and the first steel ball 5 backs down by the active force overcoming the first spring 3, at this moment, the hydraulic oil of the second hydraulic fluid port B flows into spool 6 inner chamber by the first radial direction through hole a in the middle part of spool 6, and flow into the first hydraulic fluid port A by the second radial direction through hole b of spool 6 rear end, thus load is slowly declined.Piston 11 continues to move to left, and the piston rod 8 external part top of piston 11 on spool 6, and makes spool 6 depart from valve seat 7, and at this moment the hydraulic oil of the second hydraulic fluid port B flows into the first hydraulic fluid port A by the gap between spool 6 and valve body 2 again, thus load rate of descent is accelerated.
3, when loadlock aloft time, selector valve is beaten at meta, 3rd hydraulic fluid port X takes back fuel tank, the path of cut-out pressure source and selector valve A1, under the pressure effect that spool 6 produces in the first spring 3 and load, makes spool 6 reset, the outer conical surface of spool 6 back segment matches with valve seat 7 again, form linear sealing, cut off the path between the first hydraulic fluid port A and the second hydraulic fluid port B, by loadlock aloft.
Claims (6)
1. an equilibrium valve, comprises and is provided with the first hydraulic fluid port (A) and the second hydraulic fluid port (B) and arranges the piston (11) that the valve body (2) of the tubular of the first chamber (G) and the second chamber (H), the end cap (1) being sealedly connected on valve body (2) two ends respectively and screw plug (14), spool (6), steel ball, valve seat (7) and cover have the second spring vertically, described screw plug (14) rear end is provided with the 3rd hydraulic fluid port (X), described 3rd hydraulic fluid port (X) place is provided with filter screen device, damping device, it is characterized in that: described valve seat (7) is located in valve body (2) first chamber (G), and be positioned between the first hydraulic fluid port (A), the second hydraulic fluid port (B), described spool (6) leading portion is slidably tied in end cap (1), the back segment of described spool (6) is matched with in the through hole of valve seat (7), described spool (6) is provided with the inner chamber axially run through, the first steel ball (5) matched with spool (6) inner chamber is provided with in described spool (6), and described spool (6) inner chamber is provided with the boss (6.1) for carrying out axial limiting to steel ball, described spool (6) inner chamber is provided with the first spring (3) offseted with the first steel ball (5), the other end of described first spring (3) is butted in end cap (1), described piston (11) is sliding to be assigned in the second chamber (H), and the stepped end of piston rod (8) is slidably tied in the inner chamber of spool (6) through the locular wall the first chamber (G) and the second chamber (H), described piston (11) rear end is provided with one-way throttling device.
2. equilibrium valve according to claim 1, it is characterized in that: described one-way throttling device is fixed on the ear end face of piston (11), described one-way throttling device comprises the first damper (12) and the second steel ball (10), matches in the 3rd chamber (I) that described the second steel ball (10) is placed in piston (11) with the valve port of the first damper (12).
3. equilibrium valve according to claim 1, it is characterized in that: the periphery that described spool (6) back segment matches with the through hole of valve seat (7) is conical surface, and the outer conical surface of described spool (6) and valve seat (7) linear sealing.
4. equilibrium valve according to claim 1, it is characterized in that: described spool (6) middle part is provided with the first radial direction through hole (a) of connection second hydraulic fluid port (B) and spool (6) inner chamber, and its rear end is provided with the second radial direction through hole (b) of connection first hydraulic fluid port (A) and spool (6) inner chamber.
5. equilibrium valve according to claim 1, is characterized in that: the locular wall between first chamber (G) of described valve body (2) and the second chamber (H) is provided with the third through-hole (c) of connection two chamber.
6. equilibrium valve according to claim 1, is characterized in that: described piston (11) middle part is provided with the 4th radial direction through hole (d) of the 3rd chamber (I) being communicated with valve body (2) second chamber (H) and piston (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210538167.4A CN103104565B (en) | 2012-12-13 | 2012-12-13 | Balance valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210538167.4A CN103104565B (en) | 2012-12-13 | 2012-12-13 | Balance valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103104565A CN103104565A (en) | 2013-05-15 |
| CN103104565B true CN103104565B (en) | 2015-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210538167.4A Expired - Fee Related CN103104565B (en) | 2012-12-13 | 2012-12-13 | Balance valve |
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| Country | Link |
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| CN (1) | CN103104565B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106015152B (en) * | 2016-07-19 | 2017-11-10 | 盐城海特机械科技有限公司 | Slowly the flow type balanced valve closed is changed up |
| CN105971963B (en) * | 2016-07-19 | 2018-02-23 | 江苏苏盐阀门机械有限公司 | Flow type balanced valve |
| CN106195370B (en) * | 2016-08-13 | 2018-11-20 | 江苏盐电阀门有限公司 | Cartridge balanced valve |
| CN107606197B (en) * | 2017-10-18 | 2018-12-07 | 华中科技大学 | A kind of deep fluid-controlled cut-off valve in the full sea of deep automatic compensating in sea |
| CN108443269B (en) * | 2018-03-23 | 2023-07-28 | 浙江迦南科技股份有限公司 | Unidirectional speed limiting device |
| CN114413053B (en) * | 2022-01-24 | 2022-11-11 | 华中科技大学 | Water-based proportional pilot valve |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3186425A (en) * | 1962-03-20 | 1965-06-01 | True Trace Corp | Convertible mode tracer valve |
| US3972345A (en) * | 1975-05-27 | 1976-08-03 | Sperry Rand Corporation | Pilot operated relief valve |
| CN1170067C (en) * | 2001-12-07 | 2004-10-06 | 卢永松 | Hydraulic balancing valve |
| CN2682234Y (en) * | 2004-02-12 | 2005-03-02 | 张思学 | Brake balancing valve |
| CN101435446A (en) * | 2007-11-14 | 2009-05-20 | 上海立新液压有限公司 | Balance valve |
| CN201461569U (en) * | 2009-05-21 | 2010-05-12 | 上海立新液压有限公司 | Hydraulic balance valve |
| CN101634317B (en) * | 2009-08-21 | 2011-12-28 | 宁波汉商液压有限公司 | Plug-in type balance valve |
| CN203051274U (en) * | 2012-12-13 | 2013-07-10 | 陈磊 | Balance valve |
-
2012
- 2012-12-13 CN CN201210538167.4A patent/CN103104565B/en not_active Expired - Fee Related
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| CN103104565A (en) | 2013-05-15 |
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| ASS | Succession or assignment of patent right |
Owner name: NINGBO JIANGDONG SIKAO TECHNOLOGY SERVICE CO., LTD Free format text: FORMER OWNER: CHEN LEI Effective date: 20150416 |
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Free format text: CORRECT: ADDRESS; FROM: 315137 NINGBO, ZHEJIANG PROVINCE TO: 315043 NINGBO, ZHEJIANG PROVINCE |
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Effective date of registration: 20150416 Address after: 315043, No. 4, No. 26, Dongfang business center, Jiangdong District, Zhejiang, Ningbo Applicant after: Ningbo Jiangdong Sikao Technology Service Co., Ltd. Address before: 315137, Zhejiang, Ningbo province Yinzhou District Yunlong Town Di village Di River District Applicant before: Chen Lei |
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