CN108150473B - A kind of buffer overflow valve - Google Patents

A kind of buffer overflow valve Download PDF

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Publication number
CN108150473B
CN108150473B CN201711441053.7A CN201711441053A CN108150473B CN 108150473 B CN108150473 B CN 108150473B CN 201711441053 A CN201711441053 A CN 201711441053A CN 108150473 B CN108150473 B CN 108150473B
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China
Prior art keywords
valve
hydraulic fluid
fluid port
valve core
main valve
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CN201711441053.7A
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CN108150473A (en
Inventor
邵立坤
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Kevin Fluid Control (Jiangsu) Co., Ltd.
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Kevin Fluid Control (jiangsu) Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/023Excess flow valves, e.g. for locking cylinders in case of hose burst

Abstract

The invention proposes a kind of buffer overflow valves, comprising: valve body which is provided with hydraulic fluid port A and hydraulic fluid port B;Current stabilization component is buffered, is located in the valve body and separates hydraulic fluid port A and hydraulic fluid port B, be equipped with the main valve core cavity being connected to hydraulic fluid port A in the buffering current stabilization component, and be formed with cushion chamber with valve body;Main valve plug is connected in the main valve core cavity and is crimped on the valve port of main valve core cavity;And swivel nut, it is connected to the other end of the valve body, is equipped with pressure regulating device in the swivel nut, the pressure regulating device connect the opening and closing of control bound core with one end of the main valve plug.The buffer overflow valve can effectively shock absorbing pressure, buffer time it is more stable, and structure is simpler, processing is more convenient.

Description

A kind of buffer overflow valve
Technical field
The present invention relates to valve technology fields, and in particular to a kind of buffer overflow valve.
Background technique
In modern mechanical equipment slewing equipment, pooling feature hydraulic circuit has been widely applied, has been filled as excavator turns round It sets, crane rotation device, high-altitude operation vehicle slewing equipment, manipulator slewing equipment and agriculture and forestry machinery slewing equipment etc., wherein Buffer overflow valve is the key that this kind of system Hydraulic Elements, and the superiority and inferiority of buffer overflow valve performance directly affects the performance of host. Existing buffer overflow valve is divided into board-like buffer overflow valve and two kinds of plug-in buffer overflow valve by connection type, in systems for Reduction installation space improves system reliability, generallys use plug-in buffer overflow valve.If notification number is CN202073860 The patent of entitled " threaded plug-in adjustable buffer overflow valve ", discloses a kind of buffer overflow valve, including valve pocket, valve seat, Spool, spring and damper piston, valve pocket have the first hydraulic fluid port, and valve seat is set to the front end of valve pocket and has the second hydraulic fluid port, spool In valve pocket, pressure regulation swivel nut has front end inner cavity, set on the rear end of valve pocket and can move axially and then can change spring Axial elastic force, after damper piston includes the guide part of rear end, the projecting ring section of middle part radial protrusion and front end axially open and spool The volumetric cylinder portion of end cooperation, the rear end face of projecting ring section are greater than front end face, have among projecting ring section for after the calm canister portion flow direction of oil liquid The interface channel in outside is held, volumetric cylinder portion laterally has the side path flowed to for the calm canister portion inner cavity of oil liquid to volumetric cylinder portion outer wall. Although the invention can be realized simple buffering relief function, it is had the disadvantage that
(1) it sets up the first stage pressure by Adjusting bolt Adjusting screw, and the pressure of the second hydraulic fluid port rises rapidly to the first order before this Pressure overflow, then damper piston again compresses spring by second mouthful of pressure rise to the second stage pressure, is mounted on Damping hole on the plug of spool front end plays the work of control buffer time when first order pressure conversion is to the second stage pressure With, but because of damping hole and the longer through-flow hole length of valve core inside thus, the response speed of spool is reduced, start in revolution And stop on more frequent equipment (such as mini-excavator) using very undesirable.
(2) in the invention, structure is complex, and volume is bigger, more demanding in processing and assembly, overall cost It is high.
(3) it controls buffer time using damping hole, non-constant by the flow of damping hole, to pressure sensitivity compared with Height, when pressure is lower, buffer time is longer, and when pressure is higher buffer time shorten, the control of buffer time is undesirable, place In a biggish fluctuation range.
Summary of the invention
For some or all of of the above-mentioned technical problem in the presence of the prior art, the invention proposes a kind of bufferings Overflow valve, the buffer overflow valve can effectively shock absorbing pressure, buffer time it is more stable, and structure is simpler, processing is more square Just.
In order to realize the above goal of the invention, the invention proposes a kind of buffer overflow valves having following structure, comprising:
Valve body which is provided with hydraulic fluid port A and hydraulic fluid port B;
Current stabilization component is buffered, be located in the valve body and separates hydraulic fluid port A and hydraulic fluid port B, is set in the buffering current stabilization component There is the main valve core cavity being connected to hydraulic fluid port A, and be formed with cushion chamber with valve body, the buffering current stabilization component includes buffering valve pocket and sets Flow stabilizing valve on trimmer valve set, the main valve core cavity are located at trimmer valve and put on, and the flow stabilizing valve is located at far from main valve core cavity One end of valve pocket is buffered, the oil inlet of the flow stabilizing valve connects hydraulic fluid port A, and the oil outlet of the flow stabilizing valve connects cushion chamber, described Flow stabilizing valve includes sequentially connected first through hole, steady flow valve core, the second through-hole and third through-hole, the first through hole and hydraulic fluid port A Connection, the third through-hole are connected to cushion chamber, and the steady flow valve core is equipped with the damping hole being connected to the first through hole, institute Stating steady flow valve core is inverted U-shaped structure, and damping hole is located at U-type groove bottom, and the steady flow valve core of inverted U connects spiral shell by the first elastic component It is stifled, the circulation passage being connected to the second through-hole is formed between screw plug and steady flow valve core, when steady flow valve core is mobile to screw plug direction When, the flow area of the circulation passage becomes smaller;
Main valve plug is connected in the main valve core cavity and is crimped on the valve port of main valve core cavity;
Swivel nut is connected to the other end of the valve body, is equipped with pressure regulating device, the pressure regulating device and institute in the swivel nut State the opening and closing of one end connection control bound core of main valve plug.
In the present invention, since the buffering current stabilization component of setting can control buffer time, thus buffer time is more stable; In addition, simplifying components and structure in the present invention, more reasonable structure is simpler, and processing is also more convenient.
In one embodiment, the pressure regulating device includes the second elastic component, and second elastic component is connected to institute It states on the connection pedestal in swivel nut, the connection pedestal is connected with adjusting rod, and the adjusting rod is threadedly coupled with the swivel nut, institute It states adjusting rod to be connected on the connection pedestal across the bottom of the swivel nut, locking nut is also socketed with outside the adjusting rod. Main valve plug cracking pressure when overflow is adjusted by adjusting rod.
In one embodiment, when hydraulic fluid port A oil inlet, oil liquid through connection main valve core cavity and hydraulic fluid port A first passage into Becoming owner of spool chamber overcomes the active force of the second elastic component to open main valve plug, and from hydraulic fluid port B overflow, the pressure of hydraulic fluid port A is first at this time Stage pressure;The pressure of hydraulic fluid port A enters cushion chamber and pushes buffering current stabilization component mobile to pressure regulating device direction, and the pressure of hydraulic fluid port A needs Overcome the active force of the second elastic component, hydraulic fluid port A's is stepped up to the second stage pressure.
In one embodiment, the main valve plug includes sequentially connected first end, conical surface portion, cylindrical portion and second End, is equipped with transition conical surface portion between the cylindrical portion and the second end, the diameter of the first end is greater than main valve core cavity Diameter, the diameter of the cylindrical portion are less than the diameter of main valve core cavity, and the diameter of the second end is greater than the straight of the cylindrical portion Diameter, the second end are slidably matched with main valve core cavity.
In one embodiment, the connector for connecting pressure regulating device, the company are additionally provided on the first end The diameter of fitting is greater than the diameter of the first end.
In one embodiment, the buffering current stabilization component and the valve body be equipped with prevent hydraulic fluid port A to hydraulic fluid port B and The sealing element of cushion chamber leakage.
Compared with the prior art, the advantages of the present invention are as follows:
Not only components are less for buffer overflow valve of the invention, and structure is simpler, and processing is more convenient, meeting more effectively While shock absorbing pressure, the operating pressure for the mechanism that also can preferably meet swing mechanism and require reaction speed fast is wanted It asks.In addition, buffer time is also more stable since the flow of buffering current stabilization component is constant.
Detailed description of the invention
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, in figure:
Fig. 1 is the structural schematic diagram of one of embodiment of buffer overflow valve of the invention.
In attached drawing, identical component uses identical appended drawing reference.The attached drawing is not drawn according to the actual ratio.
Specific embodiment
In order to which technical solution of the present invention and advantage is more clearly understood, below in conjunction with attached drawing to of the invention exemplary Embodiment is described in more detail.Obviously, the described embodiments are merely a part of the embodiments of the present invention, rather than The exhaustion of all embodiments.And in the absence of conflict, the feature in the embodiment and embodiment in the present invention can be mutual It combines.
It is noted that existing threaded plug-in adjustable buffer overflow valve exists, structure is complicated during invention by inventor, The problems such as shock absorbing pressure is limited and cushioning control is unstable.
Against the above deficiency, the embodiment of the present invention proposes a kind of buffer overflow valve, is illustrated below.
Fig. 1 shows a kind of one of embodiment of buffer overflow valve of the invention.In this embodiment, of the invention Buffer overflow valve specifically includes that valve body 6, buffering current stabilization component, main valve plug 5, swivel nut 8 and pressure regulating device.Wherein, in valve body 6 Portion is equipped with hydraulic fluid port A and hydraulic fluid port B.Buffering current stabilization component is located in valve body 6, and buffering current stabilization component separates hydraulic fluid port A and oil on valve body 6 Mouth B, buffering current stabilization component are formed with the cushion chamber 61 connecting with hydraulic fluid port A in the lower end of valve body 6.Buffer current stabilization component in be equipped with The main valve core cavity 45 of hydraulic fluid port A connection and the first passage for being connected to hydraulic fluid port A and main valve core cavity 45.Main valve plug 5 is connected to main valve plug The valve port of main valve core cavity is blocked on chamber 45.Swivel nut 8 is connected to the other end (being upper end in Fig. 1) of valve body 6, and pressure regulating device is located at spiral shell In set 8.Pressure regulating device connect the pressure of the opening and closing of control bound core with one end of main valve plug 5.
In one embodiment, the current stabilization that buffering current stabilization component specifically includes that buffering valve pocket 4 and is located on buffering valve pocket 4 Valve.Flow stabilizing valve is located at the lower part of buffering valve pocket 4, is located at one end far from main valve core cavity 45.One end (generally oil inlet of flow stabilizing valve Mouthful) be connected to hydraulic fluid port A, the other end (generally oil outlet) is connected to cushion chamber 61.Namely flow stabilizing valve is located at hydraulic fluid port A and buffering Between chamber 61, the flow that control oil liquid enters cushion chamber 61 from hydraulic fluid port A keeps substantially constant not with pressure change.And then it can be with Control buffer time is more constant, is not influenced by pressure change.
In one embodiment, main valve core cavity 45 is located at the middle and upper part of buffering valve pocket 4, and buffering valve pocket 4 is equipped with for connecting The first passage of logical hydraulic fluid port A and main valve core cavity 45.The first passage is mainly by the recess portion 46 that is located on buffering valve pocket 4 and oblique logical The connection of hole 44 is formed.Since the through-current capacity of the first passage is bigger, thus in pressure change, the unlatching of main valve plug 6 and pass It closes and is swift in response.
In one embodiment, flow stabilizing valve is without being especially arranged valve body, but the lower part to buffer valve pocket 4 is as its valve Body.Flow stabilizing valve mainly includes sequentially connected first through hole 41, steady flow valve core 3, the second through-hole 42 and third through-hole 43.Wherein, First through hole 41, the second through-hole 42 and third through-hole 43 are on buffering valve pocket 4 by processing formation, and first through hole 41 1 As by it is small opening or gap be connected to hydraulic fluid port A, third through-hole 43 is directly connected to cushion chamber 61.Steady flow valve core 3 be equipped with The damping hole 31 that first through hole 41 is connected to.
In one embodiment, buffering valve pocket 4 is provided with dedicated for installing the stepped hole of steady flow valve core 3.Steady flow valve core 3 For inverted U-shaped structure, damping hole 31 is located at U-type groove bottom.Opening on the buffering valve pocket 4 of 3 face of steady flow valve core of inverted U is set There is screw plug 1.Screw plug 1 is threadably secured with buffering valve pocket 4 and connect.Pass through first between the steady flow valve core 3 and screw plug 1 of inverted U Elastic component 2 connects, and under the action of the first elastic component 2, steady flow valve core 3, which is pressed upward, to be connect on the shoulder of stepped hole.In addition, The circulation passage being connected to the second through-hole 42 is formed between screw plug 1 and the steady flow valve core 3 of inverted U, when steady flow valve core 3 is to screw plug When 1 direction mobile (moving down in Fig. 1 for steady flow valve core 3), the flow area of the circulation passage becomes smaller.
In one embodiment, pressure regulating device mainly includes the second elastic component 7, is equipped in swivel nut 8 and connects pedestal 9, and second The upper end of elastic component 7 is connected on the connection pedestal 9.Connection pedestal 9 is connected with adjusting rod 10, and adjusting rod 10 passes through with swivel nut 8 It is threadedly coupled, the upper end bottom that adjusting rod 10 passes through swivel nut 8 is connected on connection pedestal 9, and locking is also socketed with outside adjusting rod 10 Nut 11.
In one embodiment, when hydraulic fluid port A oil inlet, oil liquid enters main valve core cavity 45 through first passage and overcomes the second elasticity The active force of part 7 opens main valve plug 5, and from hydraulic fluid port B overflow, the pressure of hydraulic fluid port A is first class pressure at this time.Meanwhile the pressure of hydraulic fluid port A Push buffering current stabilization component mobile (moving up in Fig. 1) to pressure regulating device direction into cushion chamber 61, the pressure of hydraulic fluid port A needs Overcome the active force of the second elastic component 7, hydraulic fluid port A's is stepped up to the second stage pressure.
In one embodiment, main valve plug 5 mainly includes sequentially connected first end, conical surface portion, cylindrical portion and second End.Transition conical surface portion is equipped between cylindrical portion and the second end, the diameter of first end is greater than the diameter of main valve core cavity, cylinder The diameter in portion is less than the diameter of main valve core cavity, and the diameter of the second end is greater than the diameter of cylindrical portion, the second end and main valve core cavity It is slidably matched.When conical surface portion is crimped on the valve port of main valve core cavity 45, the communicating passage between hydraulic fluid port A and hydraulic fluid port B, pressure regulation are closed Main valve plug 5 is crimped on buffering valve pocket 4 by mechanism by the first end of main valve plug 5.
In one embodiment, the connector 12 for connecting pressure regulating device is additionally provided on first end, connector 12 is whole Body is truncated cone-shaped, and the minimum diameter of the connector 12 of the truncated cone-shaped is greater than the diameter of first end.
In one embodiment, buffering current stabilization component is equipped with valve body 6 prevents hydraulic fluid port A from letting out to hydraulic fluid port B and cushion chamber The sealing element of leakage.In addition, as the male threaded joint of the lower end outside of valve body 6, the middle part of valve body 6 and swivel nut 8 be equipped with it is close Sealing.
In one embodiment, primary focus of the invention and basic functional principle are as follows:
1) flow stabilizing valve is mainly formed by steady flow valve core 3, the first elastic component 2 and the second through-hole 42, it can be with by the flow stabilizing valve Control oil liquid is entered the flow substantially constant of cushion chamber 61 by hydraulic fluid port A, and the flow due to entering cushion chamber 61 does not become with pressure Change, thus it is more stable to the control of buffer time.The working principle of flow stabilizing valve is similar with the principle of two-way flow rate valve, main logical Pressure difference and steady flow valve core 3 and the second through-hole 42 of 31 front and back of overdamp hole are formed by changing for the flow area size of throttle orifice Become, it is constant to control the flow basic guarantee passed through.
2) the simple and reasonable of valve pocket 4 is buffered, and flow stabilizing valve is integrated into buffering valve pocket 4 together in valve body 6 It slides up and down, such mechanism makes the first stage pressure directly open the progress overflow of main valve plug 5, while oil liquid passes through first through hole 41, enter in cushion chamber 61 after the damping hole 31 of steady flow valve core 3, the second through-hole 42, third through-hole 43, the pressure in cushion chamber 61 After power rises, gradually pushes buffering valve pocket 4 to move up the opening for reducing main valve plug 5, A mouthfuls of pressure is made to be gradually increasing promotion main valve Core 5 moves upwards the second elastic component 7 of compression, and hydraulic fluid port A pressure is made finally to rise to the second stage pressure.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic Property concept, then additional changes and modifications may be made to these embodiments.Therefore, it includes excellent that the following claims are intended to be interpreted as Select embodiment and fall into having altered and/or modifying for the scope of the invention, the change that embodiment according to the present invention is made and/ Or modification should be covered by the protection scope of the present invention.

Claims (6)

1. a kind of buffer overflow valve characterized by comprising
Valve body which is provided with hydraulic fluid port A and hydraulic fluid port B;
Buffer current stabilization component, be located in the valve body and separate hydraulic fluid port A and hydraulic fluid port B, in the buffering current stabilization component equipped with The main valve core cavity of hydraulic fluid port A connection, and it is formed with cushion chamber with valve body, the buffering current stabilization component includes buffering valve pocket and is located at slow The flow stabilizing valve on valve pocket is rushed, the main valve core cavity is located at trimmer valve and puts on, and the flow stabilizing valve is located at the buffering far from main valve core cavity One end of valve pocket, the oil inlet of the flow stabilizing valve connect hydraulic fluid port A, and the oil outlet of the flow stabilizing valve connects cushion chamber, the current stabilization Valve includes sequentially connected first through hole, steady flow valve core, the second through-hole and third through-hole, and the first through hole is connected to hydraulic fluid port A, The third through-hole is connected to cushion chamber, and the steady flow valve core is equipped with the damping hole being connected to the first through hole, described steady Flow valve core is inverted U-shaped structure, and damping hole is located at U-type groove bottom, and the steady flow valve core of inverted U connects screw plug by the first elastic component, The circulation passage being connected to the second through-hole is formed between screw plug and steady flow valve core, when steady flow valve core is mobile to screw plug direction, The flow area of the circulation passage becomes smaller;
Main valve plug is connected in the main valve core cavity and is crimped on the valve port of main valve core cavity;And
Swivel nut is connected to the other end of the valve body, is equipped with pressure regulating device, the pressure regulating device and the master in the swivel nut The opening and closing of one end connection control bound core of spool.
2. buffer overflow valve according to claim 1, which is characterized in that the pressure regulating device includes the second elastic component, institute It states on the connection pedestal that the second elastic component is connected in the swivel nut, the connection pedestal is connected with adjusting rod, the adjusting rod It is threadedly coupled with the swivel nut, the bottom that the adjusting rod passes through the swivel nut is connected on the connection pedestal, the adjusting Locking nut is also socketed with outside bar.
3. buffer overflow valve according to claim 2, which is characterized in that when hydraulic fluid port A oil inlet, oil liquid is through connecting main valve plug The first passage of chamber and hydraulic fluid port A enter main valve core cavity and the active force of the second elastic component are overcome to open main valve plug, from hydraulic fluid port B overflow, The pressure of hydraulic fluid port A is the first stage pressure at this time;The pressure of hydraulic fluid port A enters cushion chamber and pushes buffering current stabilization component to pressure regulating device side To movement, the pressure of hydraulic fluid port A needs to overcome the second elastic component active force, and hydraulic fluid port A's is stepped up to the second stage pressure.
4. buffer overflow valve according to any one of claim 1 to 3, which is characterized in that the main valve plug includes successively First end, conical surface portion, cylindrical portion and the second end of connection are equipped with the transition conical surface between the cylindrical portion and the second end Portion, the diameter of the first end are greater than the diameter of main valve core cavity, and the diameter of the cylindrical portion is less than the diameter of main valve core cavity, institute The diameter for stating the second end is greater than the diameter of the cylindrical portion, and the second end is slidably matched with main valve core cavity.
5. buffer overflow valve according to claim 4, which is characterized in that be additionally provided on the first end and adjusted for connecting The connector of press mechanism, the diameter of the connector are greater than the diameter of the first end.
6. buffer overflow valve according to claim 1, which is characterized in that set on the buffering current stabilization component and the valve body There is the sealing element for preventing hydraulic fluid port A from leaking to hydraulic fluid port B and cushion chamber.
CN201711441053.7A 2017-12-27 2017-12-27 A kind of buffer overflow valve Active CN108150473B (en)

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CN108150473B true CN108150473B (en) 2019-07-23

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109162977B (en) * 2018-10-19 2020-08-28 湖北江威智能汽车股份有限公司 Rotary cushion valve

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CN202182080U (en) * 2011-08-15 2012-04-04 宁波广天赛克思液压有限公司 Overflow valve with secondary buffering function for hydraulic pump
CN102444637A (en) * 2011-09-27 2012-05-09 广西柳工机械股份有限公司 Plug-in overflow valve
CN204300040U (en) * 2014-12-05 2015-04-29 宁波克泰液压有限公司 Screw thread inserting type cutting type relief valve
CN104613036A (en) * 2015-01-20 2015-05-13 洛阳理工学院 Noise reduction overflow valve with hydrodynamic force balancing and adjustable damping functions
DE102014226623A1 (en) * 2014-12-19 2016-06-23 Robert Bosch Gmbh Pressure relief valve and thus equipped hydraulic machine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2351512A (en) * 1942-07-03 1944-06-13 Pesco Products Co Nonchattering relief valve
US4252145A (en) * 1979-03-15 1981-02-24 W-K-M Wellhead Systems, Inc. Manually reset control valve for a fluid actuator
DE3238781A1 (en) * 1982-10-20 1984-04-26 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Current divider valve
CN102235393A (en) * 2011-08-15 2011-11-09 宁波广天赛克思液压有限公司 Buffer relief valve for hydraulic motor
CN202182080U (en) * 2011-08-15 2012-04-04 宁波广天赛克思液压有限公司 Overflow valve with secondary buffering function for hydraulic pump
CN102444637A (en) * 2011-09-27 2012-05-09 广西柳工机械股份有限公司 Plug-in overflow valve
CN204300040U (en) * 2014-12-05 2015-04-29 宁波克泰液压有限公司 Screw thread inserting type cutting type relief valve
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CN104613036A (en) * 2015-01-20 2015-05-13 洛阳理工学院 Noise reduction overflow valve with hydrodynamic force balancing and adjustable damping functions

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