CN107631064B - It can be used for the ratio one-way flow valves of low-load - Google Patents

It can be used for the ratio one-way flow valves of low-load Download PDF

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Publication number
CN107631064B
CN107631064B CN201711103469.8A CN201711103469A CN107631064B CN 107631064 B CN107631064 B CN 107631064B CN 201711103469 A CN201711103469 A CN 201711103469A CN 107631064 B CN107631064 B CN 107631064B
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valve
hole
hydraulic fluid
fluid port
plug
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CN107631064A (en
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陈艳艳
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Jiangsu Si Da heavy industry Co., Ltd
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Jiangsu Si Da Heavy Industry Co Ltd
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Abstract

The present invention relates to a kind of ratio one-way flow valves that can be used for low-load, it is characterised in that: including valve body, valve pocket, valve pocket is equipped with the first hydraulic fluid port, the second hydraulic fluid port and valve port;Main valve plug is equipped in valve pocket, the periphery conical surface and valve port of main valve plug cooperate, and have control chamber and installation cavity in main valve plug, the first damping hole is provided on the side wall of main valve plug, the inside of main valve plug is equipped with the second damping hole, the aperture of the aperture of the first damping hole less than the second damping hole;Pilot valve is equipped in control chamber, pilot valve can be moved up and down by proportion electro-magnet structure control, and the lower end of pilot valve and the second damping hole cooperate;Bushing and valve seat are installed in installation cavity, there is the first through flow hole, the second through flow hole and throttle orifice in bushing, throttling valve core is equipped in valve seat, is supported with the first spring below throttling valve core, when throttling valve core overcomes the effect of the first spring to move downward, throttling valve core will be gradually reduced the opening of throttle orifice.It is the ratio one-way flow valves that can be used for low-load that a kind of structure is more reasonable, at low cost.

Description

It can be used for the ratio one-way flow valves of low-load
Technical field
The invention belongs to the technical field of hydraulic valve more particularly to a kind of ratio one-way flow valves that can be used for low-load.
Background technique
In recent years, ratio one-way flow valves are gone up and down in truck-mounted crane, high-altitude operation vehicle, tractor rotary tillage plough, electri forklift etc. Using more and more in equipment.When equipment stops, ratio one-way flow valves play the role of pressure maintaining, prevent hydraulic cylinder from gliding; When equipment needs to decline, ratio one-way flow valves control openings of sizes according to the voltage signal size of input, adjust hydraulic cylinder The flow of output, and then control the decrease speed of lifting device.Currently there are ratio one-way flow valves, have it is following lack Point:
1. the flow control of ratio one-way flow valves is to drive pilot valve by proportion electro-magnet, guide's oil return section is adjusted Flow area, and then change the size of main valve plug control cavity pressure, effect of the main valve plug in load pressure and control cavity pressure pressure difference Under follow pilot valve to open.Because the variation of load causes the range of main valve plug load cavity pressure change can in reality is practical It can be 0.3~25MPa, such as load pressure may be 25MPA when electri forklift full-load run, and when empty, load pressure Power is lower than 1MPa.Main valve plug is opened excessive when loading too big in order to prevent, the throttling of the throttle orifice of general pilot valve control Area is smaller, in this way when load pressure is 1~25MPa, needs on main valve plug because the power that pressure difference generates can be such that main valve plug reaches Aperture is wanted, when load pressure is lower than 1MPa, area of passage, the pressure and load pressure of main valve plug control chamber are adjusted by pilot valve The difference very little of power results in spool aperture very little in this way and does not open even, the flow of demand is not achieved, influences ratio one-way flow The application of valve.
In conclusion existing ratio one-way flow valves can be further improved.
Summary of the invention
The technical problem to be solved by the present invention is to for above-mentioned state of the art and provide a kind of structure it is more reasonable, Ratio one-way flow valves that are at low cost, can be used for low-load.
The technical scheme of the invention to solve the technical problem is: a kind of ratio one-way flow that can be used for low-load Measure valve, it is characterised in that: including valve body, the lower thread of valve body is connected with the valve pocket with the stepped hole axially penetrated through, valve pocket Lower ending opening form the first hydraulic fluid port, be provided with the second hydraulic fluid port being connected to stepped hole, the small hole portion of stepped hole on the side wall of valve pocket Input end form the valve port for being connected to first hydraulic fluid port and the second hydraulic fluid port;Stepped main valve plug, main valve are equipped in valve pocket The periphery conical surface and valve port of core cooperate, so that moving up and down for main valve plug can open and close valve port, the top in the main valve plug is formed Control chamber, the lower part in main valve plug form the installation cavity communicated with the first hydraulic fluid port, it is oily that connection second are provided on the side wall of main valve plug First damping hole of mouth and control chamber, the inside of main valve plug are equipped with the second damping hole to be connected to control chamber and installation cavity, and Aperture of the aperture of first damping hole less than the second damping hole;The pilot valve that can be moved up and down is equipped in the control chamber, first Guide valve core can be moved up and down by being mounted on the proportion electro-magnet structure control of valve body upper end, the lower end of pilot valve and the second resistance Buddhist nun Kong Peihe, so that pilot valve moves up and down the opening degree that can control the second damping hole;It is equipped in the installation cavity Bushing and valve seat, valve seat are located at below bushing, and the lower end aperture of valve seat with the first hydraulic fluid port to communicate, in bushing periphery and installation cavity Hole is formed with annular channel, has the first through flow hole, the second through flow hole and throttle orifice radially axially penetrated through in bushing, the Two through flow holes and throttle orifice are communicated with annular channel, and throttling valve core, the upper end convex shoulder of throttling valve core and first are equipped in valve seat Through flow hole is slidably matched and is separated for upper and lower two chamber, and the second through flow hole is communicated with the epicoele of the first through flow hole, throttle orifice and The cavity of resorption of first through flow hole communicates, and the lower end of throttling valve core is provided with the oil-through-hole of connection the first hydraulic fluid port and the first through flow hole cavity of resorption, The first spring is supported with below throttling valve core, which makes throttling valve core stay open the state of throttle orifice, works as throttling When spool overcomes the first acting force of the spring to move downward, throttling valve core will be gradually reduced the aperture of throttle orifice.
In one embodiment, the upper end of the throttling valve core from top to bottom includes with the first through flow hole mating part Convex shoulder and the first cylinder, the diameter of convex shoulder are greater than the diameter of the first cylinder, convex shoulder and the first cylinder can in this way formed enough Big annulus flow area.
In one embodiment, aforementioned proportion electromagnet structure includes determining iron part, armature part, second spring and line Enclose part, it is described determine iron part and plug and be weldingly fixed on the intracorporal upper end of valve, armature part be set to valve body it is interior and can on move down Dynamic, the upper end of the pilot valve is connected to the lower end of armature part and can move up and down with armature part, the second spring It is supported on and determines between iron part and armature part, the coiler part is set in and constrains in valve body top with can be to determining iron part Form induction.The above are a kind of specific structures of proportion electro-magnet structure, and existing other structures also can be used certainly.
Preferably, the lower end of above-mentioned armature part is equipped with T-slot, the upper end of the pilot valve is equipped with T shape connecting column, The T shape connecting column, which is embedded in the T-slot, forms connection.The connection type is convenient for assembling between the two.
Preferably, the surface cooperated between the lower end of above-mentioned pilot valve and the second damping hole is the conical surface.
Compared with the prior art, the advantages of the present invention are as follows: this ratio one-way flow valves can meet low-load and use.Specifically , when the second hydraulic fluid port oil inlet, when proportion electro-magnet structure being made to give certain voltage, proportion electro-magnet structure generates certain suction Power, armature part overcome the power of second spring to generate certain upward displacement, pilot valve are driven to be separated from the second damping hole, this When control intracavitary pressure and will decline, the pressure in the pressure and control chamber of the second hydraulic fluid port has pressure difference, this differential pressure action is in main valve On core (main valve plug is stepped shape, generates difference in areas), but resultant force is also not enough to that main valve plug is pushed to move up at this time;Continue to increase ratio Voltage on example electromagnet structure, the pressure difference in the pressure and control chamber of the second hydraulic fluid port increase, and main valve plug is begun to move up, the The oil liquid of two hydraulic fluid ports flows to the first hydraulic fluid port.Continue to increase to the voltage of proportion electro-magnet structure, the second damping hole and pilot valve Between area of passage reach maximum, main valve plug fully opens at this time.If the pressure of the second hydraulic fluid port is bigger, the oil in control chamber Liquid pushes throttling valve core that the compressing force of the first spring is overcome to move downward, keeps throttling valve core upper end convex after the second damping hole Shoulder gradually covers in throttle orifice, reduces the area of passage of throttle orifice, the pressure reduction in control chamber will not be made excessive in this way, thus Keep main valve plug opening excessive;And when the pressure of the second hydraulic fluid port is relatively low, oil liquid is not enough to overcome the first bullet after the second damping hole When the compressing force of spring, throttling valve core is in the position for fully opening throttle orifice, and area of passage is maximum, therefore the pressure of control chamber can To obtain biggish release, the pressure of the second hydraulic fluid port and the available guarantee of the pressure difference of control chamber, make main valve plug in the second hydraulic fluid port Pressure it is lower when can also reach larger open.
Detailed description of the invention
Fig. 1 is the cross-sectional view of the embodiment of the present invention;
Fig. 2 is the partial sectional view of the embodiment of the present invention;
Fig. 3 is the enlarged view at I of Fig. 2;
Fig. 4 is function schematic diagram of the invention.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
It as shown in Figures 1 to 3, is a preferred embodiment of the present invention.
A kind of ratio one-way flow valves can be used for low-load, including valve body 1, the lower thread of valve body 1, which is connected with, to be had The valve pocket of the stepped hole 21 axially penetrated through, the lower ending opening of valve pocket 2 form the first hydraulic fluid port A, are provided on the side wall of valve pocket 2 and ladder Second hydraulic fluid port B of hole connection, the input end of the small hole portion of stepped hole 21 form the valve port of connection the first hydraulic fluid port A and the second hydraulic fluid port B 22。
Stepped main valve plug 3 is equipped in valve pocket 2, the periphery conical surface and valve port 22 of main valve plug 3 cooperate, so that main valve plug 3 move up and down can open and close valve port 22, and control chamber 31 is formed at the top in main valve plug 3, and the lower part in main valve plug 3 is formed and first The installation cavity 32 that hydraulic fluid port A is communicated is provided with the first damping hole 4a of connection the second hydraulic fluid port B and control chamber 31 on the side wall of main valve plug 3, The inside of main valve plug 3 is equipped with the second damping hole 4b to be connected to control chamber 31 Yu installation cavity 32, and the hole of the first damping hole 4a Aperture of the diameter less than the second damping hole 4b.
It is equipped with the pilot valve 5 that can be moved up and down in control chamber 31, pilot valve 5 is by being mounted on the ratio of 1 upper end of valve body Electromagnet structure 6 is controlled and can be moved up and down, and the lower end of pilot valve 5 and the second damping hole 4b cooperate, so that pilot valve 5 The opening degree that can control the second damping hole 4b is moved up and down, is cooperated between the lower end of pilot valve 5 and the second damping hole 4b Surface is the conical surface, and the lower end of pilot valve 5 can be pierced by downwards the second damping hole 4b.
Proportion electro-magnet structure 6 includes determining iron part 61, armature part 62, second spring 63 and coiler part 64, described Determine the upper end that iron part 61 plugs and is weldingly fixed in valve body 1, armature part 62 is set in valve body 1 and can move up and down, first The upper end of guide valve core 5 is connected to the lower end of armature part 62 and can move up and down with armature part 62, and second spring 63 is supported on Determine between iron part 61 and armature part 62, the coiler part 64 is set in and constrains in 1 top of valve body with can be to determining iron portion 61 are divided to form induction.The lower end of armature part 62 is equipped with T-slot 621, and 5 upper ends of the pilot valve are equipped with T shape connecting column 51, The T shape connecting column 51 is embedded in the T-slot 621 and forms connection.
Bushing 7 and valve seat 8 be installed, valve seat 8 is located at 7 lower section of bushing, and the lower end aperture of valve seat 8 is with the in installation cavity 32 One hydraulic fluid port A is communicated, and 7 periphery of bushing and 32 inner hole of installation cavity are formed with annular channel 33, has first axially penetrated through in bushing 7 Through flow hole 71, the second through flow hole 72 and throttle orifice 73 radially, the second through flow hole 72 and throttle orifice 73 with annular channel 33 Communicate, be equipped with throttling valve core 9 in valve seat 8, the upper end convex shoulder 91 of throttling valve core 9 and the first through flow hole 71 be slidably matched and by its every Break as upper and lower two chamber, the second through flow hole 72 is communicated with the epicoele of the first through flow hole 71, under throttle orifice 73 and the first through flow hole 71 Chamber communicates, and the lower end of throttling valve core 9 is provided with the oil-through-hole 93 of connection the first hydraulic fluid port A and 71 cavity of resorption of the first through flow hole, throttling valve core 91 lower section is supported with the first spring 10, which makes throttling valve core 9 stay open 73 state of throttle orifice, works as throttle valve When core 9 overcomes 10 active force of the first spring to move downward, throttling valve core 9 will be gradually reduced the aperture of throttle orifice 73.
The working principle of the invention and process are as follows
If the second hydraulic fluid port B oil inlet, when proportion electro-magnet structure 6 gives certain voltage, proportion electro-magnet structure 6 is generated Certain suction, armature part 62 overcome the power of second spring 63 to generate certain upward displacement, pilot valve 5 are driven to be separated from Second damping hole 4b, the pressure in control chamber 31 will decline at this time, and the pressure in the pressure and control chamber 31 of the second hydraulic fluid port B has pressure Difference, this differential pressure action (main valve plug 3 is stepped shape, generates difference in areas) on main valve plug 3, but resultant force is also not enough to push at this time Main valve plug 3 moves up;Continue to increase the voltage in proportion electro-magnet structure, the pressure difference in the pressure and control chamber 31 of the second hydraulic fluid port B Increase, main valve plug 3 is begun to move up, and the oil liquid of the second hydraulic fluid port B flows to the first hydraulic fluid port A.To the voltage of proportion electro-magnet structure 6 Continue to increase, the area of passage between the second damping hole 4b and pilot valve 5 reaches maximum, and main valve plug 3 fully opens at this time.If The pressure of second hydraulic fluid port B is bigger, and the oil liquid in control chamber 31 pushes throttling valve core 9 to overcome the after the second damping hole 4b The compressing force of one spring 10 moves downward, and the convex shoulder 91 of throttling valve core 9 is made gradually to cover in throttle orifice 73, reduces throttle orifice 73 Area of passage, oil liquid flow into the second through flow hole 72 through the epicoele of the first through flow hole 71, enter back into after annular channel 33 through throttle orifice 73 outflows, will not make the pressure reduction in control chamber 31 excessive in this way, cause main valve plug 3 is made to be open excessive;And as the second hydraulic fluid port B Pressure it is relatively low, when oil liquid is not enough to overcome after the second damping hole 4b the compressing force of the first spring 10, throttling valve core 9 is in By the completely open state of throttle orifice 73, the area of passage of throttle orifice 73 is maximum, thus control chamber 31 pressure it is available compared with Big release, the available guarantee of pressure difference of the pressure and control chamber 31 of the second hydraulic fluid port B, makes main valve plug 3 in the pressure of the second hydraulic fluid port B Also it can reach larger open when power is lower.
Although the preferred embodiment of the present invention has been described in detail above, it is to be clearly understood that for this field Technical staff for, the invention may be variously modified and varied.Done within the spirit and principles of the present invention What modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (5)

1. a kind of ratio one-way flow valves that can be used for low-load, it is characterised in that: including valve body (1), the lower end spiral shell of valve body (1) Line is connected with the valve pocket with the stepped hole (21) axially penetrated through, and the lower ending opening of valve pocket (2) forms the first hydraulic fluid port (A), valve pocket (2) the second hydraulic fluid port (B) being connected to stepped hole is provided on side wall, the input end of the small hole portion of stepped hole (21) forms connection institute State the valve port (22) of the first hydraulic fluid port (A) and the second hydraulic fluid port (B);Stepped main valve plug (3), main valve plug are equipped in valve pocket (2) (3) the periphery conical surface and valve port (22) cooperates, so that moving up and down for main valve plug (3) can open and close valve port (22), in main valve plug (3) Top form control chamber (31), the installation cavity (32) communicated with the first hydraulic fluid port (A), main valve are formed at the lower part in main valve plug (3) The first damping hole (4a) of connection the second hydraulic fluid port (B) and control chamber (31), the inside of main valve plug (3) are provided on the side wall of core (3) Equipped with the second damping hole (4b) to be connected to control chamber (31) Yu installation cavity (32), and the aperture of the first damping hole (4a) is less than The aperture of second damping hole (4b);The pilot valve (5) that can be moved up and down, pilot valve (5) are equipped in the control chamber (31) Proportion electro-magnet structure (6) by being mounted on valve body (1) upper end is controlled and can be moved up and down, the lower end of pilot valve (5) and the Two damping holes (4b) cooperation, so that pilot valve (5) moves up and down the opening degree that can control the second damping hole (4b);It is described Bushing (7) and valve seat (8) be installed in installation cavity (32), valve seat (8) is located at bushing (7) lower section, the lower end aperture of valve seat (8) with It is communicated with the first hydraulic fluid port (A), bushing (7) periphery and installation cavity (32) inner hole are formed with annular channel (33), are had in bushing (7) The first through flow hole (71), the second through flow hole (72) and throttle orifice (73) radially axially penetrated through, second through flow hole (72) it is communicated with annular channel (33) with throttle orifice (73), is equipped with throttling valve core (9) in the valve seat (8), throttling valve core (9) Upper end convex shoulder (91) and the first through flow hole (71) be slidably matched and separate be upper and lower two chamber, second through flow hole (72) It is communicated with the epicoele of the first through flow hole (71), the throttle orifice (73) communicates with the cavity of resorption of the first through flow hole (71), throttling valve core (9) lower end is provided with the oil-through-hole (93) of connection the first hydraulic fluid port (A) and the first through flow hole (71) cavity of resorption, under throttling valve core (91) Side is supported with the first spring (10), which makes throttling valve core (9) stay open the state of throttle orifice (73), works as section When flow valve core (9) overcomes the first spring (10) active force to move downward, the convex shoulder (91) will be gradually reduced throttle orifice (73) Aperture.
2. the ratio one-way flow valves according to claim 1 that can be used for low-load, it is characterised in that: the throttling valve core (9) upper end and the first through flow hole (71) mating part from top to bottom includes convex shoulder (91) and the second cylinder (92), the convex shoulder (91) diameter is greater than the diameter of the second cylinder (92).
3. the ratio one-way flow valves according to claim 1 that can be used for low-load, it is characterised in that: the ratio electromagnetism Iron construction (6) includes determining iron part (61), armature part (62), second spring (63) and coiler part (64), described to determine iron portion The upper end for dividing (61) to plug and be weldingly fixed in valve body (1), armature part (62) are set in valve body (1) and can move up and down, The upper end of the pilot valve (5) is connected to the lower end of armature part (62) and can move up and down with armature part (62), described Second spring (63), which is supported on, determines between iron part (61) and armature part (62), and the coiler part (64) is set in and constrains On valve body (1) top induction can be formed to iron part (61) are determined.
4. the ratio one-way flow valves according to claim 3 that can be used for low-load, it is characterised in that: the armature part (62) lower end is equipped with T-slot (621), and (5) upper end of the pilot valve is equipped with T shape connecting column (51), the T shape connecting column (51) it is embedded in the T-slot (621) and forms connection.
5. the ratio one-way flow valves according to claim 4 that can be used for low-load, it is characterised in that: the pilot valve (5) surface cooperated between lower end and the second damping hole (4b) is the conical surface.
CN201711103469.8A 2017-11-10 2017-11-10 It can be used for the ratio one-way flow valves of low-load Active CN107631064B (en)

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CN108709007B (en) * 2018-06-12 2020-02-14 江苏金晟元特种阀门股份有限公司 Electromagnetic stop valve
CN109139591B (en) * 2018-09-25 2020-03-10 中国农业大学 Mountain and hill self-adaptation pilot-operated type electro-hydraulic proportional threaded cartridge valve
CN111720382B (en) * 2020-06-30 2022-04-26 潍柴动力股份有限公司 Load holding valve and hydraulic control system

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Publication number Priority date Publication date Assignee Title
JPS6023684A (en) * 1983-07-18 1985-02-06 Taiheiyo Kogyo Kk Pilot-type solenoid valve opened while de-energized
CN102439341A (en) * 2009-04-30 2012-05-02 Hydac流体技术有限公司 Proportional throttle valve
CN203348653U (en) * 2013-06-26 2013-12-18 无锡商业职业技术学院 Directly-operated type sequence valve
CN103511377A (en) * 2012-06-19 2014-01-15 上海立新液压有限公司 One-way proportional flow valve
CN105443837A (en) * 2015-12-07 2016-03-30 浙江华益精密机械股份有限公司 Electromagnetic proportional flow valve
CN105570517A (en) * 2014-11-04 2016-05-11 罗伯特·博世有限公司 Valve device
CN106640811A (en) * 2016-11-24 2017-05-10 浙江华益精密机械股份有限公司 Leak-tight pressure compensation electric proportional throttle valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6023684A (en) * 1983-07-18 1985-02-06 Taiheiyo Kogyo Kk Pilot-type solenoid valve opened while de-energized
CN102439341A (en) * 2009-04-30 2012-05-02 Hydac流体技术有限公司 Proportional throttle valve
CN103511377A (en) * 2012-06-19 2014-01-15 上海立新液压有限公司 One-way proportional flow valve
CN203348653U (en) * 2013-06-26 2013-12-18 无锡商业职业技术学院 Directly-operated type sequence valve
CN105570517A (en) * 2014-11-04 2016-05-11 罗伯特·博世有限公司 Valve device
CN105443837A (en) * 2015-12-07 2016-03-30 浙江华益精密机械股份有限公司 Electromagnetic proportional flow valve
CN106640811A (en) * 2016-11-24 2017-05-10 浙江华益精密机械股份有限公司 Leak-tight pressure compensation electric proportional throttle valve

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