CN106870499B - A kind of damping buffering valve - Google Patents

A kind of damping buffering valve Download PDF

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Publication number
CN106870499B
CN106870499B CN201710294246.8A CN201710294246A CN106870499B CN 106870499 B CN106870499 B CN 106870499B CN 201710294246 A CN201710294246 A CN 201710294246A CN 106870499 B CN106870499 B CN 106870499B
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CN
China
Prior art keywords
bolt
damping
valve
spool
hydraulic control
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Expired - Fee Related
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CN201710294246.8A
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Chinese (zh)
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CN106870499A (en
Inventor
魏聪梅
刘少龙
安高成
丁鼎
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Taiyuan University of Science and Technology
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Taiyuan University of Science and Technology
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Priority to CN201710294246.8A priority Critical patent/CN106870499B/en
Publication of CN106870499A publication Critical patent/CN106870499A/en
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Expired - Fee Related legal-status Critical Current
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Classifications

    • 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
    • F15B13/04Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • 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
    • F15B20/00Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems

Abstract

The invention discloses a kind of damping buffering valves, including valve body, spool and elastomer, the damping buffering valve can realize overload buffer in the case where taking into account braking distance and braking time, the buffering valve arrangement is simple, preferable to environmental suitability, and cost is relatively low, can effectively overcome traditional Two relief valve to pressure swing adsorption scarce capacity, structure is complicated;Poor, the at high price disadvantage of electro-hydraulic proportional valve adaptability for working condition.It is easy to be widely used in the farm machinery hydraulic buffer system of work condition environment complexity, applicability improves a lot compared to existing buffer system tool.

Description

A kind of damping buffering valve
Technical field
The invention belongs to engineering and farm machinery hydraulic cushion element design fields, and in particular to a kind of hydraulic control parallel connection damping Trimmer valve.
Background technique
Engineering machinery and farm machinery in starting and braking and load mutation process, due to hydraulic system executive component and its The load of driving has biggish inertia, executive component can be made to continue to move, so that executive component brake chamber pressure in hydraulic system Power is mutated the several times to operating pressure, generates hydraulic shock vibration and noise, oil suction chamber, which is easy to produce negative pressure, leads to air pocket and pressure Fluctuation causes fluid pressure line and Hydraulic Elements to damage and reduces the service life.To solve problems, need in engineering and agriculture The buffer system of load sudden change is prevented with setting in machinery hydraulic system.It is mostly used in engineering and farm machinery hydraulic system at present The multi-way valve that Two relief valve and unidirectional Fill valve integrate is connected in parallel on hydraulic actuator (motor, hydraulic cylinder) both ends, in starting and braking High pressure chest, which releases partial high pressure oil liquid by overflow valve, in the process prevents overload pressure to be mutated, and low pressure chamber is anti-by check valve repairing The only generation of negative pressure air pocket.In recent years, the higher occasion of some required precisions also starts to improve using electro-hydraulic proportional valve hydraulic The starting and braking performance of executive component.
The multi-way valve integrated using overflow valve and check valve in practical applications, the general provision: " setting of buffer overflow valve Pressure is higher than the rated operating pressure of system by 5%~10% ", and there are pressure overshoots when due to overflow valve work, so in overflow Before the valve port opening of valve in a flash, the pressure peak in system generally can be more than 30% or more of system nominal pressure.Overflow valve system Dynamic buffer loop is respectively to set a set of overflow valve and check valve on two oil circuits of system working connection to complete executive component two Braking in a direction of motion makes system complex cumbersome and inconvenient in the installation and maintenance of system in this way, and higher cost, to pressure The absorbability of fluctuation is limited.
The starting and braking impact of performance for improving hydraulic actuator using electro-hydraulic proportional valve is preferable, but it is with price It is high, poor to working environment adaptability, need relevant electric-control system the deficiencies of, be not suitable for some pairs of required precisions not High, operating condition complexity, the demanding farm machinery occasion of cost performance.
Therefore, being applicable in for the buffer system that load sudden change is prevented in engineering and farm machinery hydraulic system how is improved Property, be current those skilled in the art's urgent need to resolve the technical issues of.
Summary of the invention
In order to solve the above technical problems, the present invention provides one kind to prevent from loading in engineering and farm machinery hydraulic system The buffer system of mutation, which is a kind of damping buffering valve, in the case where the braking distance and braking time taken into account Overload buffer can be achieved, the buffering valve arrangement is simple, preferable to environmental suitability, and cost is relatively low, can effectively overcome biography Unite Two relief valve to pressure swing adsorption scarce capacity, structure is complicated;Electro-hydraulic proportional valve adaptability for working condition is poor, expensive scarce Point.It is easy to be widely used in the farm machinery hydraulic buffer system of work condition environment complexity, applicability is compared to existing buffering System tool improves a lot.
In order to achieve the above technical purposes, the present invention provides a kind of damping buffering valves, including valve body, spool and elasticity Body;The the first hydraulic control mouth that can be attached with exterior line, the second hydraulic control mouth, main oil inlet are offered on the valve body and are led back Hydraulic fluid port, the valve inner are equipped with core duct, the first hydraulic control mouth and the second hydraulic control mouth respectively with the core hole The both ends in road are connected to, and the main oil inlet, main oil return opening are connected to the middle part in the core duct;The spool is placed in the core In portion duct, it can be moved left and right along the extending direction in the core duct, the spool and the core duct are cooperatively connected, And two mutual disconnected first annular seal spaces and the second seal chamber are formed, the both ends of the spool at least one end is equipped with the elasticity Body, the both ends of the spool are communicated with the first hydraulic control mouth and the second hydraulic control mouth respectively;The spool have left position, in Position, the working position of right position three;When the medium differential pressure in the first hydraulic control mouth and the second hydraulic control mouth is less than the elastomer Elastic force when, the spool is located at middle position, and the main oil inlet described at this time is connected to the first annular seal space, the main oil return opening with The second seal chamber connection, but be not connected between the main oil inlet and the main oil return opening;When the first hydraulic control mouth When pressure medium is greater than the elastic force of the elastomer greater than the pressure medium and the two pressure difference of the second hydraulic control mouth, the valve Core is pushed by the medium in the first hydraulic control mouth, and the spool moves to right, into right position, the main oil inlet described at this time and the master Oil return opening is connected to the first annular seal space;When the pressure medium of the second hydraulic control mouth is greater than Jie of the first hydraulic control mouth When matter pressure and the two pressure difference are greater than the elastic force of the elastomer, the spool is pushed away by the medium in the second hydraulic control mouth Dynamic, the spool moves to left, and into left position, the main oil inlet described at this time and the main oil return opening connect with second seal chamber It is logical.
Based on the above technical solution, the present invention can also make improvement further below.
Further, the damping buffering valve further includes one or more oil inlet damping bolts and one or more oil return dampings Bolt, the valve body are equipped with bolt hole, and the oil inlet damping bolt and oil return damping bolt are mounted on the bolt hole In;The oil inlet damping bolt and oil return damping bolt all have annular groove, through slot hole and damping hole;The annular groove edge The side wall of the oil inlet damping bolt and oil return damping bolt circumferentially opens up;The through slot hole is opened in the annular groove It is interior, and penetrated through along the radial direction that the oil inlet damps bolt and oil return damping bolt;The damping hole is to hinder along the oil inlet The elongate slot that the axial direction of Buddhist nun's bolt and oil return damping bolt opens up, one end are connected to the oil inlet damping bolt and institute The end of oil return damping bolt is stated, the other end is connected to the through slot hole and then is connected to the annular groove;The main oil inlet And the main oil return opening damps the annular groove of bolt and oil return damping bolt respectively with the oil inlet respectively and is connected, And pass through the damping hole and the core hole link.
Further, the oil inlet damping bolt and oil return damping bolt are respectively two, and two oil inlets Bolt and two oil return damping bolts are damped respectively about the axisymmetrical in the core duct.
Further, the oil inlet damping bolt and oil return damping bolt and the bolt hole screw thread on the valve body Connection.
Further, the spool is cylindrical structure, and the side of the spool is circumferentially spaced to open up that there are two annular is recessed Slot, two annular grooves and the valve body form the first annular seal space and second seal chamber.
Further, the elastomer is two, is respectively arranged on the both ends of the spool.
Further, the core duct is through-hole, installs a duct end cap respectively at the both ends in the core duct, two A elastomer is separately positioned between two duct end caps and two end faces of spool.
Further, one end of the duct end cap is groove type structure, and the inside of the groove type structure is by being set to institute Multiple radial through-hole that duct end cap sidewalls open up are stated to be connected to the first hydraulic control mouth or the second hydraulic control mouth.
Further, the valve body is rectangular parallelepiped structure.
Further, the elastomer is spring.
The beneficial effects of the present invention are:
1, a kind of damping buffering valve provided by the present invention only components institute group a small amount of by valve body, spool and elastomer etc. At, therefore structure is simple, manufacturing cost is lower, installs also very convenient.
2, in such a way that two oil inlets damp bolt and two oil returns damp bolt difference parallel connection, machine can be greatly improved The adaptation range of tool system can be applied under various working.
3, using spool liquid controlled reversing, the limitation of solenoid directional control valve spool stroke and valve port opening is avoided.
4, opening for trimmer valve can be set with the valve body lap of splice by the spring or design spool for choosing different-stiffness The size of pressure and throttling spool area is opened, has flexibility high, it is more that cracking pressure overshoot is much smaller than the buffering that overflow valve forms The advantages of road valve.
5, in parallel respectively using two oil inlet damping bolts and two oil return damping bolts, the knot of oil inlet and outlet damped series Structure makes spool have better inhibiting effect to pressure jump, is more conducive to the buffering of engineering machinery or farm machinery, protects Protecting system is not hit, and improves service life.
Detailed description of the invention
Fig. 1 is a kind of cross-section structure of the specific embodiment of damping buffering valve provided by the present invention, while the valve Core is located at schematic diagram when middle position;
Fig. 2 be along Fig. 1 C-C to schematic cross-sectional view;
Fig. 3 be along Fig. 1 D-D to schematic cross-sectional view;
Fig. 4 is the disassemblying structure schematic diagram of Fig. 1 illustrated embodiment;
Fig. 5 is that the oil inlet shown in Fig. 1 damps bolt or the oil return damps a kind of specific embodiment of bolt Schematic perspective view;
Fig. 6 is a kind of schematic perspective view of specific embodiment of the duct end cap shown in Fig. 1;
Fig. 7 is the schematic cross-sectional view when spool is located at right position;
Fig. 8 is the schematic cross-sectional view when spool is located at left position;
Fig. 9 is the principle that a kind of damping buffering valve provided by the present invention is connected to one of hydraulic system specific embodiment Figure.
Wherein: 1, valve body, 2, spool, 3, oil inlet damping bolt, 4, oil return damping bolt, 5, core duct, 6, bolt hole, 7, elastomer, 8, duct end cap, 9, oil inlet duct, 10, oil return duct, 11, annular groove, 12, damping hole, 13, through slot hole, 14, Screw thread, 81, groove type structure, 82, radial through-hole;
A, the first hydraulic control mouth, B, the second hydraulic control mouth, P, main oil inlet, T, main oil return opening, E, first annular seal space are F, second close Seal chamber;
100, hydraulic cylinder, 101, hydraulic cylinder oil inlet, 102, hydraulic cylinder oil return opening, 201, main oil inlet pipe road, 202, lead back Oil-piping.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description The present invention is described in further detail.
Fig. 1 to Fig. 9 is please referred to, Fig. 1 is a kind of section of the specific embodiment of damping buffering valve provided by the present invention Structure, while the schematic diagram when spool is located at middle position;Fig. 2 be along Fig. 1 C-C to schematic cross-sectional view;Fig. 3 is along Fig. 1 D-D is to schematic cross-sectional view;Fig. 4 is the disassemblying structure schematic diagram of Fig. 1 illustrated embodiment;Fig. 5 is the oil inlet shown in Fig. 1 Damp a kind of schematic perspective view of specific embodiment of bolt or oil return damping bolt;Fig. 6 is shown in Fig. 1 A kind of schematic perspective view of specific embodiment of the duct end cap;Fig. 7 is the section view when spool is located at right position Schematic diagram;Fig. 8 is the schematic cross-sectional view when spool is located at left position;Fig. 9 is a kind of damping buffering valve provided by the present invention It is connected to the schematic diagram of one of hydraulic system specific embodiment.
In a kind of specific embodiment of damping buffering valve provided by the present invention, including valve body 1, spool 2 and elasticity Body 7;Elastomer 7 can be cushion, rubber pad etc. with Telescopic, or spring, preferably spring, because of spring It is easier control cushion effect, is relatively easy to install, cost is relatively low.Offering on the valve body 1 can carry out with exterior line The first hydraulic control mouth A, the second hydraulic control mouth B, main oil inlet P and the main oil return inlet T of connection are equipped with core duct inside the valve body 1 5, the first hydraulic control mouth A and the second hydraulic control mouth B are connected to the both ends in the core duct 5 respectively, the main oil inlet P, main oil return inlet T is connected to the middle part in the core duct 5;The spool 2 is placed in the core duct 5, can be along described The extending direction in core duct 5 moves left and right, and the spool 2 is cooperatively connected with the core duct 5, and forms two and do not connect mutually Logical first annular seal space E and the second seal chamber F.
Both ends at least one end of the spool 2 is equipped with the elastomer 7 and is necessary to ensure that the bullet if be arranged at one end Property body 7 can either be stretched and can be compressed, with ensure spool 2 when mobile to both direction, can by elastomer 7 into Row resets, and in the present invention, the elastomer 7 is preferably two, is respectively arranged on the both ends of the spool 2.It can make spool in this way Both ends be symmetrical structure, be easy to control pressure balance, also be easy installation implement.
The both ends of the spool 2 are communicated with the first hydraulic control mouth A and the second hydraulic control mouth B respectively;The spool 2 has Left position, middle position, the working position of right position three;When the medium differential pressure in the first hydraulic control mouth A and the second hydraulic control mouth B is less than institute When stating the elastic force of elastomer 7, the spool 2 is located at middle position, and the main oil inlet P described at this time is connected to the first annular seal space E, institute It states main oil return inlet T to be connected to the second seal chamber F, but is not connected between the main oil inlet P and the main oil return inlet T;When The pressure medium of the first hydraulic control mouth A is greater than the pressure medium of the second hydraulic control mouth B and the two pressure difference is greater than the bullet Property body 7 elastic force when, the spool 2 is pushed by the medium in the first hydraulic control mouth A, and the spool 2 moves to right, into right position, The main oil inlet P described at this time and the main oil return inlet T are connected to the first annular seal space E;As Jie of the second hydraulic control mouth B Matter pressure greater than the first hydraulic control mouth A pressure medium and the two pressure difference be greater than the elastomer 7 elastic force when, the valve Core 2 is pushed by the medium in the second hydraulic control mouth B, and the spool 2 moves to left, into left position, the main oil inlet P described at this time and institute Main oil return inlet T is stated to be connected to the second seal chamber F.
In order to preferably inhibit due in hydraulic system the pressure jump of executive component brake chamber generate hydraulic shock vibration and Noise, the damping buffering valve further include one or more oil inlet damping bolts 3 and one or more oil return damping bolts 4, institute Valve body 1 is stated to be mounted in the bolt hole 6 equipped with bolt hole 6, the oil inlet damping bolt 3 and oil return damping bolt 4.
Oil inlet damps bolt 3 and oil return damping 4 structure of bolt is identical, in the bolt hole 6 installed by screw thread 14.It is described into Oil damping bolt 3 and oil return damping bolt 4 all have annular groove 11, through slot hole 13 and damping hole 12;The annular groove 11 The side wall for damping bolt 3 and oil return damping bolt 4 along the oil inlet circumferentially opens up;The through slot hole 13 is opened in the ring In shape slot 11, and penetrated through along the radial direction that the oil inlet damps bolt 3 and oil return damping bolt 4;The damping hole 12 is edge The elongate slot that the axial direction of the oil inlet damping bolt 3 and oil return damping bolt 4 opens up, one end are connected to the oil inlet The end of bolt 3 and oil return damping bolt 4 is damped, the other end is connected to the through slot hole 13 and then is connected to the annular Slot 11;The main oil inlet P and the main oil return inlet T damp bolt 3 with the oil inlet respectively and oil return damping bolt 4 divides Other annular groove 11 is connected, and is connected to by the damping hole 12 with the core duct 5.
In order to improve buffering effect, the oil inlet damping bolt 3 and oil return damping bolt 4 are respectively two, and Two oil inlet damping bolts 3 and two oil returns damp bolts 4 respectively about the axisymmetrical in the core duct 5.
The oil inlet damping bolt 3 and the oil return damp bolt 4 with the bolt hole 6 on the valve body 1 It is threadedly coupled, sealing easy to accomplish in this way avoids oil liquid leakage.
The spool 2 is cylindrical structure, and the side of the spool 2 is circumferentially spaced to be opened up there are two annular groove, two A annular groove and the valve body 1 form the first annular seal space E and the second seal chamber F.
The core duct 5 is through-hole, installs a duct end cap 8, two institutes respectively at the both ends in the core duct 5 Elastomer 7 is stated to be separately positioned between two duct end caps 8 and two end faces of spool 2.
One end of the duct end cap 8 is groove type structure 81, and the inside of the groove type structure 81 is described by being set to Multiple radial through-hole 82 that end cap 8 side wall in duct opens up are connected to the first hydraulic control mouth A or described second hydraulic control mouth B.First The position of hydraulic control mouth A and the second hydraulic control mouth B and 82 face of radial through-hole can will enter the first hydraulic control mouth A or the in this way Oil liquid in two hydraulic control mouth B enters the both ends of spool using radial through-hole 82, to push spool 2 mobile.
The shape and structure of valve body 1 can be unrestricted, designs as needed, in general, in order to install and process The convenience of manufacture, the valve body 1 can be designed as rectangular parallelepiped structure.First hydraulic control mouth A and the second hydraulic control mouth B is arranged at one On face, main oil inlet P and the setting of main oil return inlet T are on the other surface.It is understood that in actual use, it can be according to need Want the above-mentioned hydraulic fluid port position of unrestricted choice.
In order to illustrate the working principle of damping buffering valve provided by the invention, below by the reality of a specific hydraulic system Example is applied to be specifically addressed.
It as described in Figure 9, is that a kind of damping buffering valve provided by the present invention is connected to the specific implementation of one of hydraulic system The schematic diagram of example.In figure, hydraulic cylinder 100 accesses hydraulic system by main oil inlet pipe road 201 and main oil returning tube 202, wherein main Inflow pipeline 201 accesses hydraulic cylinder oil inlet 101, and main oil returning tube 202 accesses hydraulic cylinder oil return opening 102, meanwhile, institute of the present invention The orifice valve of offer also accesses the hydraulic system, specifically, the first hydraulic control mouth A and 201 piping connection of main oil inlet pipe road, valve body 1 On main oil inlet P also with 201 piping connection of main oil inlet pipe road;Second hydraulic control mouth B and main 202 piping connection of oil returning tube, valve Main oil return inlet T on body 1 also with main 202 piping connection of oil returning tube.By the pressure difference of two hydraulic control mouths of A, B come control valve core 2 Displacement and orifice size.By the damping hole of four damping bolts in parallel two-by-two come surge suppressing.
Specific work process is described as follows: when hydraulic cylinder 100 is in nominal situation, main oil inlet P passes through two parallel connections The elongated damping hole 12 of oil inlet damping bolt 3 be connected to the first annular seal space E of annular, main oil return inlet T pass through two it is in parallel The elongated damping hole 12 of oil return damping bolt 4 is connected to the second seal chamber F of annular.When the rod chamber of hydraulic cylinder 100 and without bar When pressure is not up to starting differential pressure, oil liquid damps bolt 3 by oil inlet and is sealed in first annular seal space E chamber in main oil inlet P, main Oil liquid damps bolt 4 by oil return and is sealed in the second seal chamber F in oil return inlet T, and oil liquid is in valve in main oil inlet P, main oil return inlet T It is in isolation under the cooperation of core 1 and valve body 2, as shown in Figure 1.
When pressure difference is less than cracking pressure, spool is mobile to low-pressure side, and the shaft shoulder reduces the lap seal with valve body in the middle part of spool Length, so as to the quick response when there is pressure jump.When the piston of hydraulic cylinder 100 inwardly retracts braking, due to main oil inlet Mouth P is communicated with hydraulic cylinder oil inlet 101, and main oil inlet P pressure mutation occurs and increases, main oil return inlet T pressure reduction, in the first liquid Control mouth A, the second hydraulic control mouth B differential pressure action bottom spool move to right, as shown in fig. 7, when pressure difference reaches buffering valve opening pressure, four Damping hole 12 is instantaneously connected to, and oil liquid is close by the damping hole 12, first of oil inlet damping bolt 3 in parallel in main oil inlet P at this time The damping hole 12 that envelope chamber E, oil return in parallel damp bolt 4 refills low pressure chamber.When the spool 2 of the bigger trimmer valve of pressure difference is displaced more Greatly, orifice size is bigger, and trimmer valve through-current capability is stronger, and the purpose of surge suppressing is played by elongated damping hole, is prevented The pressure jump of brake chamber causes to impact and generates the adverse consequences such as noise to system, by playing inhibition to low pressure chamber repairing The generation of air pocket.
When the piston of hydraulic cylinder 100 is braked under overhanging operating condition, due to main oil return inlet T and 102 phase of hydraulic cylinder oil return opening Logical, there is mutation and increases in pressure in main oil return inlet T, pressure reduction in main oil inlet P, simultaneously as the first hydraulic control mouth A with it is hydraulic Cylinder oil inlet 101 communicates, and the second hydraulic control mouth B is communicated with hydraulic cylinder oil return opening 102, and oil liquid pressure is greater than the in the second hydraulic control mouth B The pressure of one hydraulic control mouth A moves to left, the liquid when pressure difference reaches buffering valve opening pressure in the second hydraulic control mouth B pressure effect bottom spool 2 102 oil liquid of hydraulic cylinder oil return opening of cylinder pressure 100 is by the damping hole 12 of oil return damping bolt 4 in parallel, the second seal chamber F, simultaneously The damping hole 12 of the oil inlet damping bolt 3 of connection refills low pressure chamber, as shown in figure 8, equally, under such conditions also by elongated Damping hole plays the purpose of surge suppressing, prevents the pressure jump of brake chamber from causing to impact and generate noise etc. no to system Good consequence inhibits the generation of air pocket by playing to low pressure chamber repairing.
A kind of damping buffering valve provided by the present invention is described in detail above.Specific case used herein Principle and implementation of the present invention are described, the above embodiments are only used to help understand side of the invention Method and its core concept.It should be pointed out that for those skilled in the art, not departing from the principle of the invention Under the premise of, it can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the claims in the present invention In protection scope.

Claims (10)

1. a kind of damping buffering valve, which is characterized in that including valve body (1), spool (2) and elastomer (7);
Offered on the valve body (1) the first hydraulic control mouth (A) that can be attached with exterior line, the second hydraulic control mouth (B), it is main into Hydraulic fluid port (P) and main oil return opening (T) are equipped with core duct (5) inside the valve body (1), the first hydraulic control mouth (A) and described the Two hydraulic control mouths (B) are connected to the both ends of the core duct (5) respectively, the main oil inlet (P), main oil return opening (T) with it is described The middle part in core duct (5) is connected to;
The spool (2) is placed in the core duct (5), can move left and right along the extending direction of the core duct (5), The spool (2) and the core duct (5) are cooperatively connected, and form two mutual disconnected first annular seal spaces (E) and second Seal chamber (F), both ends at least one end of the spool (2) are equipped with the elastomer (7), the both ends of the spool (2) respectively with The first hydraulic control mouth (A) and the second hydraulic control mouth (B) communicate;
The spool (2) has left position, middle position, the working position of right position three;
When the medium differential pressure in the first hydraulic control mouth (A) and the second hydraulic control mouth (B) is less than the elastic force of the elastomer (7) When, the spool (2) is located at middle position, and the main oil inlet (P) described at this time is connected to the first annular seal space (E), the main oil return Mouth (T) is connected to second seal chamber (F), but is not connected between the main oil inlet (P) and the main oil return opening (T);
When the pressure medium of the first hydraulic control mouth (A) is greater than the pressure medium and the two pressure difference of the second hydraulic control mouth (B) Greater than the elastomer (7) elastic force when, the spool (2) by the first hydraulic control mouth (A) medium push, the spool (2) it moves to right, into right position, the main oil inlet (P) described at this time and the main oil return opening (T) connect with the first annular seal space (E) It is logical;
When the pressure medium of the second hydraulic control mouth (B) is greater than the pressure medium and the two pressure difference of the first hydraulic control mouth (A) Greater than the elastomer (7) elastic force when, the spool (2) by the second hydraulic control mouth (B) medium push, the spool (2) it moves to left, into left position, the main oil inlet (P) described at this time and the main oil return opening (T) connect with second seal chamber (F) It is logical;The damping buffering valve further includes that one or more oil inlet dampings bolt (3) and one or more oil returns damp bolt (4), The valve body (1) is equipped with bolt hole (6), described in oil inlet damping bolt (3) and oil return damping bolt (4) are mounted on In bolt hole (6).
2. a kind of damping buffering valve according to claim 1, which is characterized in that the oil inlet damping is bolt (3) and described Oil return damping bolt (4) all has annular groove (11), through slot hole (13) and damping hole (12);Bolt (3) are damped along the oil inlet And the side wall of oil return damping bolt (4) circumferentially offers the annular groove (11);The through slot hole (13) is opened in institute It states in annular groove (11), and along oil inlet damping bolt (3) and the radial perforation of oil return damping bolt (4);The resistance Buddhist nun hole (12) is to damp the elongate slot that the axial direction of bolt (4) opens up, one along oil inlet damping bolt (3) and the oil return End is connected to the end of oil inlet damping bolt (3) and oil return damping bolt (4), the other end and the through slot hole (13) It is connected to and then is connected to the annular groove (11);
The main oil inlet (P) and the main oil return opening (T) damp spiral shell with oil inlet damping bolt (3) and the oil return respectively The annular groove (11) of bolt (4) is connected, and is connected to by the damping hole (12) with the core duct (5).
3. a kind of damping buffering valve according to claim 2, which is characterized in that the oil inlet damping is bolt (3) and described It is respectively two that oil return, which damps bolt (4), and two oil inlet dampings bolt (3) and two oil returns damp bolt (4) respectively about the axisymmetrical of the core duct (5).
4. a kind of damping buffering valve according to claim 3, which is characterized in that the oil inlet damping is bolt (3) and described Oil return damping bolt (4) is threadedly coupled with the bolt hole (6) on the valve body (1).
5. a kind of damping buffering valve according to claim 1, which is characterized in that the spool (2) is cylindrical structure, institute State spool (2) side it is circumferentially spaced open up there are two annular groove, two annular grooves and the valve body (1) are formed The first annular seal space (E) and second seal chamber (F).
6. a kind of damping buffering valve according to claim 5, which is characterized in that the elastomer (7) is two, is set respectively In the both ends of the spool (2).
7. a kind of damping buffering valve according to claim 6, which is characterized in that the core duct (5) is through-hole, in institute A duct end cap (8) is installed at the both ends for stating core duct (5) respectively, and two elastomers (7) are separately positioned on two institutes It states between duct end cap (8) and two end faces of spool (2).
8. a kind of damping buffering valve according to claim 7, which is characterized in that one end of the duct end cap (8) is recessed Bathtub construction (81), multiple diameters that the inside of the groove type structure (81) is opened up by being set to duct end cap (8) side wall It is connected to through-hole (82) with the first hydraulic control mouth (A) or the second hydraulic control mouth (B).
9. a kind of damping buffering valve according to any one of claims 1 to 8, which is characterized in that the valve body (1) is rectangular Body structure.
10. a kind of damping buffering valve according to any one of claims 1 to 8, which is characterized in that the elastomer (7) is Spring.
CN201710294246.8A 2017-04-28 2017-04-28 A kind of damping buffering valve Expired - Fee Related CN106870499B (en)

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Application Number Priority Date Filing Date Title
CN201710294246.8A CN106870499B (en) 2017-04-28 2017-04-28 A kind of damping buffering valve

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Application Number Priority Date Filing Date Title
CN201710294246.8A CN106870499B (en) 2017-04-28 2017-04-28 A kind of damping buffering valve

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