CN2708020Y - Balance valve - Google Patents

Balance valve Download PDF

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Publication number
CN2708020Y
CN2708020Y CN 200420069424 CN200420069424U CN2708020Y CN 2708020 Y CN2708020 Y CN 2708020Y CN 200420069424 CN200420069424 CN 200420069424 CN 200420069424 U CN200420069424 U CN 200420069424U CN 2708020 Y CN2708020 Y CN 2708020Y
Authority
CN
China
Prior art keywords
valve
chamber
piston
oilhole
valve body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 200420069424
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Chinese (zh)
Inventor
刘先爱
杨红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XINCHENG HYDRAULIC CO Ltd CHANGDE
Original Assignee
XINCHENG HYDRAULIC CO Ltd CHANGDE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by XINCHENG HYDRAULIC CO Ltd CHANGDE filed Critical XINCHENG HYDRAULIC CO Ltd CHANGDE
Priority to CN 200420069424 priority Critical patent/CN2708020Y/en
Application granted granted Critical
Publication of CN2708020Y publication Critical patent/CN2708020Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a balance valve, which comprises a main valve and a control valve, wherein the main valve comprises a valve body, a slide valve, a balance piston, a valve sleeve, a spring, a spring base, a base and an end cap. The valve body is provided with circumscribed oil ports A, B and T. The inner part of the main valve is provided with oil holes b, c, d, e, f and g and five oil chambers (1), (2), (3), (4) and (5). The balance piston is positioned in the valve sleeve and is clung to an inner conical surface of the valve sleeve through the spring. The valve sleeve is positioned in the valve body and is clung to the valve body through the spring and the balance piston. The control valve comprises an oil inlet connector and a control piston. The slide valve is arranged between the control piston and the balance piston. The base is arranged between the end cap and the valve sleeve. The utility model is used in engineering machinery and construction machinery. The utility model has the advantages that oil liquid in the chamber (3) of the balance piston can flow back into an oil tank through two paths when a crane arm is shrunk, the passage diameter of the flow paths is enlarged, and the retraction speed of a piston rod is enhanced. Because a back cap and the valve body are separated, the valve is easy to produce. Because the valve sleeve is provided with an axial groove, the self-lock performance of the utility model is good.

Description

Equilibrium valve
Technical field
The utility model relates to a kind of valve, relates in particular to be used for the hydraulic control equilibrium valve that the crane telescopic cylinder uses.
Background technique
In machinery such as the engineering machinery in modern times, building machinery, adopted the hydraulic pressure load bearing system in a large number, wherein equilibrium valve is the crucial hydraulic element in this type systematic, the quality of its performance directly affects machine performance, in the crane telescopic cylinder, just use equilibrium valve, when using traditional equilibrium valve, when the piston rod of crane telescopic oil cylinder bounces back, the rodless cavity oil return is not smooth, the back pressure height, and the liquid resistance increases, energy loss is serious, retraction speed is slow, and efficient is low, and this phenomenon is perplexing the hoist industry always; And there are three grades of concentric structures in the valve body of equilibrium valve, equalizing piston, valve pocket, and difficulty of processing is big, and quality of processing is difficult to guarantee that cause yield rate low, this phenomenon is perplexing hydraulic element manufacturing enterprise always.
Summary of the invention
Technical problem to be solved in the utility model is piston rod when retraction that overcomes the crane telescopic oil cylinder, and the defective that the rodless cavity oil return is not smooth provides a kind of easy processing, highly sensitive, stable and reliable for performance, equilibrium valve that efficient is high.
The technological scheme that technical problem adopted that the utility model solves is: this equilibrium valve is cylindrical, comprise main valve and control valve, it is characterized in that: main valve includes valve body, valve pocket, equalizing piston and end cap, outer oil-collecting hole A is arranged on the valve body, B, T, there is oilhole d main valve inside, e and 3., 4., 5. three oil pockets, corresponding with the A mouth be 3. chamber, the equalizing piston two ends are 4. chamber, 5. chamber, equalizing piston is positioned at valve pocket, be close to by spring on the inner conical surface of valve pocket, valve pocket is positioned at valve body, passes through spring, equalizing piston is close on the valve body, and oilhole e is arranged on the valve pocket, communicate with B mouth on the valve body, the equalizing piston outside is provided with 2~8 throttling grooves, and there is oilhole d at the equalizing piston center, and 5. the chamber communicates with 3. chamber through oilhole d; Control valve comprises fuel inlet fitting and control piston, fuel inlet fitting is installed on the valve body and the other end of end cap correspondence, outer oil-collecting hole X is arranged on the fuel inlet fitting, there is oilhole a at the center, control piston is installed in the valve body, be 1. chamber and 2. chamber before and after the control piston, oilhole arranged on the control piston, make 1. the chamber and 2. the chamber communicate.
One guiding valve is arranged between control piston and equalizing piston, guiding valve be cylindrical shape and equalizing piston over against, by spring, an end is connected with equalizing piston with valve body, the other end.
Oilhole b and c are arranged on the circumference of guiding valve, and when control piston promoted to move on the guiding valve, hydraulic fluid port A communicated with the T mouth through oil-through hole b and c; When control piston did not promote guiding valve, the c hole contacted with valve interior wall, and A mouth and T mouth are closed.
One base is arranged between end cap and valve pocket, and the valve pocket rear portion is 6. chamber, and the base rear portion is 7. chamber, and axial oilhole f is arranged between valve pocket and the valve body, and hydraulic fluid port B communicates with 6. chamber through oilhole f, and axial clearance g is arranged between base and the end cap, 6. chamber and 7. the chamber be communicated with.
Aperture, b hole is 20~30% of a guiding valve inner chamber length, and aperture, c hole is 30~40% of a guiding valve inner chamber length.
Compared with prior art, advantage of the present utility model is: during the hoist semi-girder, under the spring force effect of 3. chamber oil pressure and spring 5, guiding valve 4 is close in the valve body 2, A mouth and T mouth is closed, because flow only passes through one-way valve, flow to the B mouth from the A mouth, so whole process flow resistance is little, energy loss is little, the efficient height; When hoist contracted arm, the fluid in the 3. chamber of equalizing piston can divide two roads to flow back to fuel tank, and the runner latus rectum has strengthened, and the piston rod retraction speed has been accelerated, and system back pressure has reduced, and the liquid resistance has also reduced, and energy loss is little, the efficient height; The equalizing piston outside is provided with many throttling grooves, and along with moving of equalizing piston, the area of this place's restriction changes thereupon, thereby action is sensitive more, steady; Because bonnet and valve body are thrown off, and do not have three grades of concentric structures between each part, so this valve is processed easily; Have axial groove on the valve pocket, as long as the B mouth has pressure, oil pressure acts on the valve pocket by axial groove, and valve pocket tightly is attached on the valve body, and self-locking property is better.
Description of drawings
Fig. 1 is a sectional view of the present utility model;
Fig. 2 is a hydraulic schematic diagram of the present utility model.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing: among the figure 1, fuel inlet fitting, and 2, valve body, 3, control piston, 4, guiding valve, 5, spring, 6, equalizing piston, 7, valve pocket, 8, spring, 9, spring, 10, spring seat, 11, base, 12, end cap.A, b, c, d, e, f, g are oil-through holes of the present utility model; 1., 2., 3., 4., 5., 6., 7. be inner oil pocket of the present utility model; A, B, X, T are the utility model and the hydraulic fluid port that is connected of other element, A 2, B 2, P is the outer oil-collecting hole of control valve.
Referring to Fig. 1, equilibrium valve comprises main valve and control valve.Main valve includes valve body 2, guiding valve 4, equalizing piston 6 and valve pocket 7, spring 5,8,9, spring seat 10, base 11, end cap 12, outer oil-collecting hole A is arranged on the valve body 2, B, T, there is oilhole b main valve inside, c, d, e, f, g and 3., 4., 5., 6., 7. five oil pockets, corresponding with the A mouth be 3. chamber, equalizing piston 6 two ends are 4. chamber, 5. chamber, valve pocket 7 rear portions are 6. chamber, base 11 rear portions are 7. chamber, equalizing piston 6 is positioned at valve pocket 7, by spring 8,9 are close on the inner conical surface of valve pocket 7, valve pocket 7 is positioned at valve body 2, by spring 8,9, equalizing piston 6 is close on the valve body 2, guiding valve 4 and equalizing piston 6 over against, by spring 5, one ends and valve body 2, the other end is connected with equalizing piston 6, and oilhole b and c are arranged on the guiding valve 4, when control piston 3 promotes to move on the guiding valve 4, hydraulic fluid port A communicates with the T mouth through oil-through hole b and c, and when control piston 3 does not promote guiding valve 4, the c hole contacts with valve body 2 inwalls, A mouth and T mouth are closed, have on the valve pocket 7 that the B mouth communicates on oilhole e and the valve body 2, axial oilhole f is arranged between valve pocket 7 and the valve body 2, hydraulic fluid port B communicates with 6. chamber through oilhole f, between base 11 and the end cap 12 axial clearance g is arranged, 6. chamber and 7. chamber connection, equalizing piston 6 outsides are provided with 6 throttling grooves, there is oilhole d at equalizing piston 6 centers, and 5. the chamber communicates with 3. chamber through oilhole d; Control valve comprises fuel inlet fitting 1 and control piston 3, fuel inlet fitting 1 is installed on the valve body 2 and the other end of end cap 12 correspondences, outer oil-collecting hole X is arranged on the fuel inlet fitting 1, there is oilhole a at the center, and control piston 3 is installed in the valve body, and control piston 3 front and back are 1. chamber and 2. chamber, on the control piston 3 oilhole is arranged, make 1. the chamber, 2. chamber and guiding valve 4 inner chambers communicate, aperture, b hole be the guiding valve inner chamber long 25%, aperture, c hole be the guiding valve inner chamber long 35%.
Fig. 2 is that the utility model is applied in the hydraulic schematic diagram on the telescopic crane boom.The main hydraulic fluid port B of this valve links to each other with the rodless cavity of crane telescopic cylinder; The A mouth B of high-pressure oil pipe and control valve 2Mouth links to each other; Control port X respectively with the rod chamber of crane telescopic cylinder, the 1. chamber of this valve inner control piston 3, the A of control valve 2Mouth links to each other; The T mouth directly takes back fuel tank; Other two hydraulic fluid port P, T of hoist control valve connect pressure oil-source and oil sump tank respectively.
The work control procedure of this valve is as follows:
1. during the normal semi-girder of hoist, the 3-position 4-way control valve is changed to the position of upper end.Under spring 8,9 effects, equalizing piston 6 is attached on the inner conical surface of valve pocket 7 tightly, and at this moment, pressure oil is by the hydraulic fluid port B of control valve 2A communicates with hydraulic fluid port; The rod chamber of crane telescopic cylinder and control port X are by hydraulic fluid port A 2Communicate with oil sump tank.Pressure oil enters from main hydraulic fluid port A, act on guiding valve 4 upper ends on the one hand, guiding valve 4 is close in the valve body 2, the passage in A chamber and T chamber is turn-offed, overcome the pretightening force of spring 8,9 on the other hand, promote to move on the valve pocket 7, the gap of pressure oil between valve pocket 7 and valve body 2, rodless cavity from main hydraulic fluid port B inflow crane telescopic cylinder promotes the oil cylinder piston bar and stretches out, and the fluid of the rod chamber of crane telescopic cylinder is through control valve A 2Oil sump tank, this is normal semi-girder operating mode.
2. when allowing telescopic crane boom be parked in the air, the 3-position 4-way control valve is changed to the neutral position, cut-out pressure oil enters the passage of this valve master hydraulic fluid port A, stops to the oil hydraulic cylinder fuel feeding, under piston rod deadweight effect, tries hard to make piston rod descending.At this moment, valve pocket 7 is close on the valve body 2 under spring 8,9 effects, and the passage by between main hydraulic fluid port A and main hydraulic fluid port B cuts off the descending reverse oil stream of hoist piston rod, stops the piston rod retraction, and telescopic crane boom is rested in the air.
3. when hoist normally contracts arm, the 3-position 4-way control valve is changed to the position of lower end.At this moment, the rodless cavity of crane telescopic cylinder communicates with main hydraulic fluid port B; Pressure oil is by the hydraulic fluid port A of control valve 2Communicate with the rod chamber and the control port X of telescopic cylinder.The pressure oil of control port X is by the 1. chamber of damping hole a to control piston 3, utilize area difference on the control piston 3 to overcome the pretightening force of guiding valve 4 upper end springs 5, guiding valve 4 is upwards promoted, overcome the pretightening force of the spring 8,9 of equalizing piston 6 back cavities in 5. again by guiding valve 4, promote to move on the equalizing piston 6, this moment oily flow path direction be: fluid through main hydraulic fluid port B → oilhole e → equalizing piston 6 outside throttling groove → equalizing pistons 6 ante-chambers 3., equalizing piston 6 back cavities 5. fluid → damping hole d → equalizing piston 6 ante-chambers 3.; Equalizing piston 6 ante-chambers fluid 3. divides two-way: one tunnel hydraulic fluid port B through main hydraulic fluid port A → by control valve 2Flow back to fuel tank; Oilhole b and the c → T mouth oil sump tank of another road on guiding valve 4.At this moment, two roads of the oil content of crane telescopic cylinder rodless cavity flow back to fuel tank, thereby have accelerated the contract speed of arm of telescopic crane boom.After telescopic boom is reduced to the position, the 3-position 4-way control valve is changed to the neutral position, cut-out pressure oil enters the rod chamber of oil hydraulic cylinder and the path of control port X, stops to the oil hydraulic cylinder fuel feeding.At this moment, control port X does not have pressure, and equalizing piston 6 is close on the inner conical surface of valve pocket 7 under the spring force effect of spring 8,9; Guiding valve 4 is close in the valve body 2 under the spring force effect of spring 5, with the passage shutoff in A chamber and T chamber; Hole b → T mouth the oil sump tank of control piston 3 rod chambers fluid 2. on guiding valve 4.
This valve is except above-mentioned functions, also have when the normal semi-girder operating mode of hoist, because main hydraulic fluid port A often bears high pressure, high pressure hose is because of impacting or aging when damaged, and valve pocket 7 is because of main hydraulic fluid port A instantaneous loss of pressure, under the pressure effect of main hydraulic fluid port B, valve pocket 7 can be closed rapidly automatically, cut off the oil circuit of the inner main hydraulic fluid port B of this valve, stop crane telescopic cylinder stall retraction, play the effect of hydraulic lock to hydraulic fluid port A.

Claims (5)

1, equilibrium valve, for cylindrical, comprise main valve and control valve, it is characterized in that: main valve includes valve body, valve pocket, equalizing piston and end cap, outer oil-collecting hole (A) is arranged on the valve body, (B), (T), there is oilhole (d) main valve inside, (e) and (3.), (4.), (5.) three oil pockets, corresponding with (A) mouth is (3.) chamber, the equalizing piston two ends are (4.) chamber, (5.) chamber, equalizing piston is positioned at valve pocket, is close to by spring on the inner conical surface of valve pocket, and valve pocket is positioned at valve body, pass through spring, equalizing piston is close on the valve body, have on oilhole (e) and the valve body (B) mouthful to communicate on the valve pocket, the equalizing piston outside is provided with 2~8 throttling grooves, there is oilhole (d) at the equalizing piston center, and (5.) chamber communicates with (3.) chamber through oilhole (d); Control valve comprises fuel inlet fitting and control piston, fuel inlet fitting is installed on the valve body and the other end of end cap correspondence, outer oil-collecting hole (X) is arranged on the fuel inlet fitting, there is oilhole (a) at the center, control piston is installed in the valve body, be (1.) chamber and (2.) chamber before and after the control piston, oilhole is arranged on the control piston, (1.) chamber and (2.) chamber are communicated.
2, equilibrium valve according to claim 1 is characterized in that: a guiding valve, guiding valve are arranged between control piston and equalizing piston is cylindrical shape and equalizing piston over against, by spring, an end is connected with equalizing piston with valve body, the other end.
3, equilibrium valve according to claim 2, it is characterized in that: oilhole (b) and (c) is arranged on the circumference of guiding valve, when control piston promotes to move on the guiding valve, hydraulic fluid port (A) communicates with (T) mouth through oil-through hole (b) with (c), when control piston does not promote guiding valve, the C hole contacts with valve interior wall, and A mouth and T mouth are closed.
4, equilibrium valve according to claim 3 is characterized in that: (b) aperture, hole is 20~30% of a guiding valve inner chamber length, and (c) aperture, hole is 30~40% of a guiding valve inner chamber length.
5, equilibrium valve according to claim 1, it is characterized in that: a base is arranged between end cap and valve pocket, the valve pocket rear portion is (6.) chamber, the base rear portion is (7.) chamber, axial oilhole (f) is arranged between valve pocket and the valve body, hydraulic fluid port (B) communicates with (6.) chamber through oilhole (f), and axial clearance (g) is arranged between base and the end cap, and (6.) chamber and (7.) chamber are communicated with.
CN 200420069424 2004-12-07 2004-12-07 Balance valve Expired - Fee Related CN2708020Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200420069424 CN2708020Y (en) 2004-12-07 2004-12-07 Balance valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200420069424 CN2708020Y (en) 2004-12-07 2004-12-07 Balance valve

Publications (1)

Publication Number Publication Date
CN2708020Y true CN2708020Y (en) 2005-07-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200420069424 Expired - Fee Related CN2708020Y (en) 2004-12-07 2004-12-07 Balance valve

Country Status (1)

Country Link
CN (1) CN2708020Y (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101865171A (en) * 2010-07-02 2010-10-20 镇江大力液压马达有限责任公司 Thread cartridge balanced valve
CN104358902A (en) * 2014-10-15 2015-02-18 浙江华益机械有限公司 Pressure safety valve
CN108223493A (en) * 2018-03-01 2018-06-29 徐州重型机械有限公司 A kind of variable balanced valve of pilot ratio

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101865171A (en) * 2010-07-02 2010-10-20 镇江大力液压马达有限责任公司 Thread cartridge balanced valve
CN104358902A (en) * 2014-10-15 2015-02-18 浙江华益机械有限公司 Pressure safety valve
CN108223493A (en) * 2018-03-01 2018-06-29 徐州重型机械有限公司 A kind of variable balanced valve of pilot ratio

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C14 Grant of patent or utility model
GR01 Patent grant
C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee