CN203856793U - Balance valve and hydraulic cylinder telescoping control loop with same - Google Patents
Balance valve and hydraulic cylinder telescoping control loop with same Download PDFInfo
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- CN203856793U CN203856793U CN201420274937.3U CN201420274937U CN203856793U CN 203856793 U CN203856793 U CN 203856793U CN 201420274937 U CN201420274937 U CN 201420274937U CN 203856793 U CN203856793 U CN 203856793U
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Abstract
The utility model discloses a balance valve and a hydraulic cylinder telescoping control loop with the same. The balance valve comprises a valve body (1), a valve element component and a control piston (6). The valve element component comprises a main valve element (7), an auxiliary valve element (8) and an auxiliary piston (9). A third oil cavity (10) is formed between the main valve element and the auxiliary valve element and respectively communicated with a main spring cavity (3) and a second oil cavity (4). In the direction from a first oil cavity (2) to the main spring cavity, the outer diameters of the part, located in the second oil cavity, of the main valve element and the part, located in the third oil cavity, of the auxiliary valve element respectively increase. A throttling oilway (13) is formed in the main valve element. When the main valve element slides towards the main spring cavity , the first oil cavity can be communicated with the second oil cavity through the throttling oilway. When the auxiliary valve element slides, relative to the main valve element, towards the main spring cavity, the first oil cavity is communicated with the third oil cavity. The balance valve having an overflow function is small in size and convenient to mount and maintain.
Description
Technical field
The utility model relates to Hydraulic Field, particularly, relates to a kind of equilibrium valve.In addition, the utility model also relates to a kind of flexible control loop of hydraulic cylinder with described equilibrium valve.
Background technique
Equilibrium valve is as widely used a kind of hydrovalve in engineering machinery, it is typically applied in flexible control loop of hydraulic cylinder, lifting mechanism, gear and extending means etc. such as hydraulic hoist, to play the effect that prevents that load hypervelocity from declining or gliding, realize the stable working of engineering machinery relevant work mechanism.
Notoriously, equilibrium valve adopts the sequence valve hydraulic principle structure in parallel with one-way valve conventionally, wherein the forward port of one-way valve is communicated with the output port of sequence valve, the reverse port of one-way valve is communicated with the input port of sequence valve, the equilibrium valve adopting on engineering mechanical device is generally custom-designed equilibrium valve, by design of Sealing Structure and damping throttle structure design targetedly, to guarantee sealing and the stationarity in working procedure, but its hydraulic principle structure is the parallel-connection structure of sequence valve and one-way valve substantially.
Generally speaking, equilibrium valve is connected in the working oil path of rodless cavity of oil hydraulic cylinder, and wherein the reverse port of one-way valve and the rodless cavity of oil hydraulic cylinder are communicated with, and forward port is connected in oil-feed oil circuit and oil return circuit via selector valve.In different working procedure, equilibrium valve correspondingly has multiple working state.When the rodless cavity oil-feed of oil hydraulic cylinder, the forward port oil-feed of equilibrium valve, hydraulic oil enters the rodless cavity of oil hydraulic cylinder, and the piston rod of oil hydraulic cylinder drives corresponding operation mechanism (for example jib lubbing mechanism of hoist), thereby make load increase, be called forward and open; When needs operation mechanism keeps, the forward port of equilibrium valve was blocked with being communicated with of reverse port, and hydraulic oil cannot flow in oil circuit control, is called reverse sealing; When the rodless cavity oil return of oil hydraulic cylinder, equilibrium valve is oppositely opened, namely equilibrium valve is opened (hydraulic control oil generally can come from working oil path or the special-purpose hydraulic control oil circuit that the rod chamber of oil hydraulic cylinder connects) under the effect of the hydraulic control oil of control port input, thereby realize the rodless cavity oil return of oil hydraulic cylinder, be called reverse unlatching.Typically, equilibrium valve is oppositely opened and is needed hydraulic control oil to act on control piston or other to lead on control to open by the spool of this control piston driven equilibrium valve, thereby realize load, steadily transfer.
In recent years, for the security incident that prevents from causing because system oil pressure is too high occurs, researched and developed the equilibrium valve group that is integrated with relief valve.Shown in Fig. 1 and Fig. 2, be respectively a kind of schematic diagram and sectional structure schematic diagram with the equilibrium valve group of relief function in prior art, this equilibrium valve group realizes above-mentioned purpose by being connected in parallel to relief valve 21 between the forward port at original equilibrium valve and reverse port.In addition, this equilibrium valve group realizes that above-mentioned forward is opened, oppositely sealing and structure and the conventional balanced valve oppositely opened also have larger difference.
Particularly, with reference to Fig. 2, when hydraulic oil passes through forward port A oil-feed, under oil pressure effect in the first oil pocket 2, main valve plug 7 drive auxiliary valve cores 8 overcome main spring 5 elastic force and to main spring chamber 3 directions slide, thereby the hydraulic oil in the first oil pocket 2 can flow to the second oil pocket 4 by the throttling oil duct 13 ' being formed on main valve plug 7, finally by reverse port B, flows out, and can flow to oil hydraulic cylinder rodless cavity and piston rod, when needs operation mechanism keeps, the throttling groove (not shown) of hydraulic oil in the second oil pocket 4 on auxiliary valve core 8 enters main spring chamber 3, under action of hydraulic force, center hole in auxiliary valve core 8 sealing main valve plugs 7, main valve plug 7 is tightly pressed on valve pocket 17, blocking-up the second oil pocket 4 is communicated with the first oil pocket 2 simultaneously, thereby, hydraulic oil can remain in the rodless cavity of oil hydraulic cylinder, and operation mechanism is kept, when control piston 6 moves to main spring chamber 3 directions under the oil pressure effect at control port X place, can promote the also 3 directions slips to main spring chamber of auxiliary valve core 8, the sealing of 7 of auxiliary valve core 8 and main valve plugs is contacted to be opened, simultaneously, throttling groove on auxiliary valve core 8 is sealed by main valve plug 7, hydraulic oil in main spring chamber 3 flows to the first oil pocket 2 by the inside oil duct 20 being formed on auxiliary valve core 8, thereby the interior oil pressure in main spring chamber 3 is reduced, main valve plug 7 is 3 directions slips to main spring chamber, now, hydraulic oil in the second oil pocket 4 can flow to the first oil pocket 2 by throttling oil duct 13 ', realize rodless cavity oil return, in said process, the oil pressure in the second oil pocket 4 acts on the spool conical surface of relief valve 21 all the time, and when this oil pressure is during higher than the setting cracking pressure of relief valve 21, relief valve 21 is opened, and makes the second oil pocket 4 off-loads, realizes overload protection.Wherein, the oil outlet of relief valve 21 can be communicated in the first oil pocket 2 or fuel tank.
In order to realize above-mentioned functions, volume is larger because needs hold relief valve 21 for the valve body 1 of this equilibrium valve group, and structure is heavy, and installation, replacing and maintenance are wasted time and energy.
In addition in this equilibrium valve group, on main valve plug 7, for making hydraulic oil, at the first oil pocket 2 and 4 mobile throttling oil ducts of the second oil pocket 13 ', be throttling groove, as shown in Figure 3 and Figure 4.These throttling grooves are complex-shaped, and processing difficulties has increased equipment cost.
In view of this, be necessary to provide a kind of novel balance valve, solve above-mentioned problems of the prior art.
Model utility content
Technical problem to be solved in the utility model is to provide a kind of equilibrium valve, and this equilibrium valve has relief function, can effectively prevent that the security incident causing because reverse port oil pressure is too high from occurring, simultaneously, this equilibrium valve small volume, quality is relatively light, is easy for installation and maintenance.
To achieve these goals, the utility model provides a kind of equilibrium valve, comprising: the valve body that is formed with forward port and reverse port, mangetic core assembly, this mangetic core assembly is slidably received within the hollow cavity of described valve body and is separated out in this hollow cavity and lays respectively at first oil pocket at the axial two ends of described mangetic core assembly and main spring chamber and along the second circumferential oil pocket of this mangetic core assembly, wherein said the first oil pocket is communicated with described forward port, described the second oil pocket is communicated with described reverse port, and described main spring is provided with main spring in chamber, and control piston, the hydraulic control oil that the control port of described equilibrium valve is introduced can apply the thrust towards described main spring chamber to this control piston, wherein, described mangetic core assembly comprises main valve plug and is slidably received within auxiliary valve core and the sub-piston in this main valve plug, described control piston stretches in described the first oil pocket and under the effect of the hydraulic control oil that can introduce at described control port described auxiliary valve core is applied to the thrust towards described main spring chamber, described main spring can apply the thrust towards described the first oil pocket to described sub-piston in described main spring chamber, and between described main valve plug and described auxiliary valve core, be formed with the 3rd oil pocket, the 3rd oil pocket is communicated with described main spring chamber and described the second oil pocket respectively, described auxiliary valve core, between described sub-piston and described main valve plug, form the auxiliary spring chamber that accommodates auxiliary spring, and, from described the first oil pocket to described main spring cavity direction, the external diameter of the part that is positioned at described the second oil pocket of described main valve plug and the part that is positioned at described the 3rd oil pocket of described auxiliary valve core increases respectively, on described main valve plug, be formed with throttling oil duct, when described main valve plug slides to described main spring cavity direction, described the first oil pocket can be communicated with described the second oil pocket by described throttling oil duct, when described auxiliary valve core slides to described main spring cavity direction with respect to described main valve plug, described the first oil pocket is communicated with described the 3rd oil pocket.
Preferably, be also formed with the first oil duct on described main valve plug, described auxiliary spring chamber is communicated with described the first oil pocket by this first oil duct.
Preferably, be also formed with damping hole and the second oil duct on described main valve plug, described the second oil pocket is communicated with described the 3rd oil pocket by described damping hole, and described the 3rd oil pocket is communicated with described main spring chamber by described the second oil duct.
Preferably, this equilibrium valve also comprises the valve pocket in the hollow cavity that is installed on described valve body, and described main valve plug is slidably received within this valve pocket.
Preferably, the rigidity of described main spring is less than the rigidity of described auxiliary spring.
Preferably, the external diameter of described sub-piston is greater than the maximum outside diameter of described auxiliary valve core.
Preferably, in described main valve plug, be also provided with for limiting the jump ring of the position that endwisely slips of described sub-piston.
Preferably, described main spring, described control piston, described main valve plug, described auxiliary valve core, described sub-piston and described auxiliary spring coaxially arrange.
Preferably, described throttling oil duct is many cribbings discharge orifice, this many cribbings discharge orifice is arranged along the axial direction of described main valve plug, in described main valve plug, be formed with the connection oil duct being communicated with described the first oil pocket, described many cribbings discharge orifice is communicated with the described oil duct that is communicated with of this main valve plug respectively, and described in each, end opening of throttle orifice is formed on the outer circumferential face of described main valve plug.
Preferably, the hollow cavity as described connection oil duct that being formed with in the end of described the first oil pocket of described main valve plug is communicated with this first oil pocket, described in each, throttle orifice connects the sidewall of described hollow cavity, this many cribbings discharge orifice is arranged along the axial direction of described main valve plug, and one end relative with described control piston of described auxiliary valve core extend in described the first oil pocket through described hollow cavity.
Preferably, from described the first oil pocket to described main spring cavity direction, the aperture of described many cribbings discharge orifice reduces.
In addition, the utility model also provides a kind of flexible control loop of hydraulic cylinder, comprise oil hydraulic cylinder, the rod chamber of this oil hydraulic cylinder and rodless cavity are connected in selector valve via the first working oil path and the second working oil path respectively, this selector valve is connected in oil-feed oil circuit and oil return circuit, described the second working oil path is provided with equilibrium valve, wherein, the above-mentioned equilibrium valve that described equilibrium valve the utility model provides, the described forward port of this equilibrium valve is connected in described selector valve, described reverse port is connected in the rodless cavity of described oil hydraulic cylinder, described control port and described the first working oil path, the rodless cavity of hydraulic control oil circuit or described oil hydraulic cylinder connects.
By technique scheme, the fundamental function that equilibrium valve of the present utility model is opened, oppositely sealed and oppositely open except realizing forward, also there is relief function.When the second oil pocket oil pressure is when higher, the auxiliary spring between auxiliary valve core and sub-piston is further compressed, makes auxiliary valve core contact and be opened with sealing between main valve plug, thereby make hydraulic oil overflow to the first oil pocket of the second oil pocket, realize overload protection.Equilibrium valve of the present utility model by main valve plug with ingenious cooperation of auxiliary valve core realized relief function, without being set up in parallel individually relief valve, thereby effectively reduce valve volume and weight, make this equilibrium valve install and keep in repair convenient.
Other feature and advantage of the present utility model partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is a kind of schematic diagram with the equilibrium valve group of relief function in prior art;
Fig. 2 is the sectional structure schematic diagram of equilibrium valve group in Fig. 1;
Fig. 3 is the sectional structure schematic diagram of the main valve plug of equilibrium valve group in Fig. 2;
Fig. 4 is the plan view of the main valve plug of equilibrium valve group in Fig. 2;
Fig. 5 is the sectional structure schematic diagram of the equilibrium valve of the utility model embodiment;
Fig. 6 is the sectional structure schematic diagram of the part assembly of equilibrium valve in Fig. 5;
Fig. 7 is the sectional structure schematic diagram of the main valve plug of equilibrium valve in Fig. 5.
The utility model description of reference numerals
1 valve body 2 first oil pockets
3 main spring chamber 4 second oil pockets
5 main spring 6 control pistons
7 main valve plug 8 auxiliary valve cores
9 sub-pistons 10 the 3rd oil pocket
11 auxiliary spring 12 auxiliary spring chambeies
13,13 ' throttling oil duct 14 first oil ducts
15 damping hole 16 second oil ducts
17 valve pocket 18 jump rings
A forward port B reverse port
X control port
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
In the utility model, in the situation that not doing contrary explanation, the noun of locality of use typically refers to reference to upper and lower, left and right shown in the drawings as " upper and lower, left and right "; " inside and outside " refers to inside and outside with respect to the profile of each parts itself.
In the utility model, introducing " forward port ", " reverse port " describe equilibrium valve, and its implication is identical with the implication in the common one-way valve equilibrium valve in parallel with sequence valve.In order to be illustrated more clearly in, doing following explanation herein limits: in two ports on the utility model equilibrium valve except control port, the pressure oil with certain oil pressure is injected from one of them port, control port in the raw under, if can open equilibrium valve and flow out from another port, flowing into port is forward port, and outflow port is reverse port; If from this reverse port injection pressure oil, control port in the raw under, equilibrium valve should be in cut-off state.
With reference to Fig. 5, the equilibrium valve according to a kind of embodiment of the utility model, comprising: the valve body 1 that is formed with forward port A and reverse port B; Mangetic core assembly, this mangetic core assembly is slidably received within the hollow cavity of described valve body 1 and is separated out in this hollow cavity and lays respectively at first oil pocket 2 at the axial two ends of described mangetic core assembly and main spring chamber 3 and along the second circumferential oil pocket 4 of this mangetic core assembly, wherein said the first oil pocket 2 is communicated with described forward port A, described the second oil pocket 4 is communicated with described reverse port B, in described main spring chamber 3, is provided with main spring 5; And control piston 6, the hydraulic control oil that the control port X of described equilibrium valve introduces can apply the thrust towards described main spring chamber 3 to this control piston 6.
This equilibrium valve should be able to be realized foregoing four kinds of working staties: under the first oil pocket 2 internal pressure oil effects, the elastic force that makes mangetic core assembly overcome main spring 5 slides to the right, so that the first oil pocket 2 is communicated with the second oil pocket 4, realizes forward and opens; Under the effect of the second oil pocket 4 internal pressure oil, mangetic core assembly is blocked being communicated with of the second oil pocket 4 and the first oil pocket 2 hermetically, realizes oppositely sealing; Control piston 6 is under the effect of control port X oil pressure, and actuating valve core assembly slides to the right, realizes forward and opens, and meanwhile, the flow velocity of hydraulic oil from the second oil pocket 4 to the first oil pocket 2 can affect valve port opening; When control port X oil pressure deficiency, so that control piston 6 actuating valve core assemblies, and the interior oil pressure of the second oil pocket 4 is when higher, can make the second oil pocket 4 be communicated with the first oil pocket 2, realizes overflow and overload protection.
In order to realize above-mentioned working state, further, described mangetic core assembly comprises main valve plug 7 and is slidably received within auxiliary valve core 8 and the sub-piston 9 in this main valve plug 7.As a kind of typical mode of execution, in the hollow cavity of valve body 1, be conventionally provided with valve pocket 17, main valve plug 7 is slidably received within this valve pocket 17.Described control piston 6 stretches in described the first oil pocket 2 and under the effect of the hydraulic control oil that can introduce at described control port X described auxiliary valve core 8 is applied to the thrust towards described main spring chamber 3, to realize reverse unlatching.Described main spring 5 is interior in described main spring chamber 3 can apply the thrust towards described the first oil pocket 2 to described sub-piston 9, and between described main valve plug 7 and described auxiliary valve core 8, be formed with the 3rd oil pocket 10, the 3rd oil pocket 10 is communicated with described main spring chamber 3 and described the second oil pocket 4 respectively, described auxiliary valve core 8, between described sub-piston 9 and described main valve plug 7, form the auxiliary spring chamber 12 that accommodates auxiliary spring 11, and, from described the first oil pocket 2 to described main spring chamber 3 directions, the external diameter of the part that is positioned at described the second oil pocket 4 of described main valve plug 7 and the part that is positioned at described the 3rd oil pocket 10 of described auxiliary valve core 8 increases respectively, on described main valve plug 7, be formed with throttling oil duct 13, when at described main valve plug 7, to described main spring chamber, 3 directions are slided, described the first oil pocket 2 can be communicated with described the second oil pocket 4 by described throttling oil duct 13, when at described auxiliary valve core 8, with respect to described main valve plug 7, to described main spring chamber, 3 directions are slided, described the first oil pocket 2 is communicated with described the 3rd oil pocket 10.
In order to understand better the utility model, below in conjunction with accompanying drawing, describe the preferred structure of the equilibrium valve with said structure in detail and realize that forward is opened, oppositely sealing, oppositely open and principle, the process of four kinds of functions of overflow.
original state
As shown in Figure 5, under original state, the right part of control piston 6 can and auxiliary valve core 8 between there is certain interval, thereby when control port X pressure raises, control piston 6 has one section of free travel.
In conjunction with Fig. 6, for being communicated with the throttling oil duct 13 of the first oil pocket 2 and the second oil pocket 4, by valve pocket 17, sealed.This throttling oil duct 13 can form the various structures that comprises the throttling groove shown in Fig. 3 and Fig. 4.The preferred throttling oil duct 13 that the utility model provides is many cribbings discharge orifice, as shown in Figure 7.This many cribbings discharge orifice is arranged along the axial direction of described main valve plug 7, in described main valve plug 7, be formed with the connection oil duct being communicated with described the first oil pocket 2, described many cribbings discharge orifice is communicated with the described oil duct that is communicated with of this main valve plug 7 respectively, and described in each, end opening of throttle orifice is formed on the outer circumferential face of described main valve plug 7.Than the throttling oil duct 13 ' of throttling groove form in prior art, this throttle orifice has easy processing, the advantage such as cost-saving.
Further, the hollow cavity as described connection oil duct that can be communicated with this first oil pocket 2 being formed with in the end of described the first oil pocket 2 of described main valve plug 7, described in each, throttle orifice connects the sidewall of described hollow cavity, this many cribbings discharge orifice is arranged along the axial direction of described main valve plug 7, and one end relative with described control piston 6 of described auxiliary valve core 8 extend in described the first oil pocket 2 through described hollow cavity.Each throttle orifice can extend along the radial direction of main valve plug 7, also can with radial direction at an angle.Above-mentioned throttle orifice can be adjusted the flow area from the second oil pocket 4 to the first oil pocket 2 according to hydraulic oil flow velocity when equilibrium valve is oppositely opened, in order to improve spool for the susceptibility of hydraulic oil flow velocity, preferably, from described the first oil pocket 2 to described main spring chamber 3 directions, the aperture of described many cribbings discharge orifice reduces.
In addition, in order to make sealing good between valve body 1 and valve pocket 17, valve pocket 17 and main valve plug 7, main valve plug 7 and auxiliary valve core 8, can caulking gum be set at the contact position of valve body 1 and valve pocket 17, at main valve plug 7, form conical surface seal with the sealing station place of valve pocket 17 and auxiliary valve core 8, and make main spring 5 and auxiliary spring 11 there is suitable initial compression amount, particularly auxiliary spring 11, in order to limit its limit position in axial sliding, can be formed with boss at the hollow cavity of main valve plug 7, and with this boss compartment of terrain, jump ring 18 is set.Other forms of position-limit mechanism (as boss) also can be set and substitute this jump ring 18.
forward is opened
The hydraulic oil with certain pressure enters the first oil pocket 2 by forward port A, oil pressure acts on the part that main valve plug 7 is positioned at the first oil pocket 2, to promote main valve plug 7, overcome the elastic force of main spring 5, drive the 3 directions slips to main spring chamber together of auxiliary valve core 8, auxiliary spring 11 and sub-piston 9.Thereby the first oil pocket 2 is communicated with the second oil pocket 4 by throttling oil duct 13, the oil circuit that hydraulic oil can connect to reverse port B by this equilibrium valve flows.
oppositely sealing
The hydraulic oil with certain pressure enters the second oil pocket 4 by reverse port B, and on the one hand, in the second oil pocket 4, oil pressure acts on the outer circumferential face of main valve plug 7, and the hydraulic oil entering in the 3rd oil pocket 10 is exerted pressure on the outer circumferential face of auxiliary valve core 8; On the other hand, by the 3rd oil pocket 10, enter that the hydraulic oil in main spring chamber 3 is interior in this main spring chamber 3 exerts pressure to main valve plug 7 and auxiliary valve core 8.Because the effective active area in the second oil pocket 4 and the 3rd oil pocket 10 is less than the effective active area in main spring chamber 3, auxiliary valve core 8 closely contacts with main valve plug 7, main valve plug 7 closely contacts with valve pocket 17, and the second oil pocket 4 and the first being communicated with of oil pocket 2 are blocked.
Wherein, can on main valve plug 7, form damping hole 15 and the second oil duct 16, thereby the second oil pocket 4 is communicated with the 3rd oil pocket 10 by this damping hole 15, the 3rd oil pocket 10 is communicated with main spring chamber 3 by the second oil duct 16, so that the pressure oil in the second oil pocket 4 can enter in main spring chamber 3.
For guarantee auxiliary valve core 8 with main valve plug 7 at sealing station place close contact, can make the external diameter of sub-piston 9 be greater than the maximum outside diameter of auxiliary valve core 8, thereby hydraulic oil is in main valve plug chamber 5, the interior pressure to sub-piston 9 is greater than at the interior pressure to auxiliary valve core 8 of the 3rd oil pocket 10.
oppositely open
Under the effect of the hydraulic control oil of introducing at control port X, control piston 6 moves to mangetic core assembly direction.Auxiliary valve core 8 is driven and separates with main valve plug 7 by this control piston 6.Along with auxiliary valve core 8 is to the interior slip in main spring chamber 3, the hydraulic oil in main spring chamber 3 enters the 3rd oil pocket 10 by the second oil duct 16, and the part of separating by main valve plug 7 and auxiliary valve core 8 enters the first oil pocket 2, the interior oil pressure reduction in main spring chamber 3.Owing at the interior hydraulic oil of the second oil pocket 4, the outer circumferential face effect of main valve plug 7 being had to the pressure towards main spring chamber 3, so main valve plug 73 directions slips to main spring chamber, thereby the second oil pocket 4 is communicated with the first oil pocket 2 by throttling oil duct 13.
When the flow velocity of hydraulic oil from the second oil pocket 4 to the first oil pocket 2 is larger, the oil pressure that acts on main valve plug 7 outer circumferential faces at the second oil pocket 4 reduces, and main valve plug 7, to the direction adjustment away from main spring chamber 3, the flow area of throttling oil duct 13 is reduced, thereby flow velocity reduces.When the flow velocity of hydraulic oil from the second oil pocket 4 to the first oil pocket 2 hour, adjustment process is contrary.
overflow
In order to describe principle of overflow, now suppose that equilibrium valve is in reverse sealing state, the equipment being connected with reverse port B is held.Now, because making the oil pressure of reverse port B, certain factor suddenly increases, pressure in the second oil pocket 4, the 3rd oil pocket 10 and main spring chamber 3 is all increased, sub-piston 9 is stopped by the boss in main valve plug 7 and cannot be to left movement, auxiliary valve core 8 is pressed on main valve plug 7, and main valve plug 7 is pressed on valve pocket 17.Oil pressure continue to raise, until the oil pressure in the 3rd oil pocket 10 is enough to overcome the elastic force of auxiliary spring 11, makes this auxiliary spring 11 compressions, and auxiliary valve core 8 and main valve plug 7 are separated.After this running of hydraulic power oil class of paths is similar to the process of reverse unlatching, be that hydraulic oil in main spring chamber 3 is through the 3rd oil pocket 10 overflow to the first oil pockets 2, main valve plug 7 is 3 directions slips to main spring chamber, and conducting the second oil pocket 4 and the first oil pocket 2, make the hydraulic oil overflow in the second oil pocket 4.Along with the oil pressure in the second oil pocket 4 reduces with hydraulic oil overflow, auxiliary valve core 8 is fitted with main valve plug 7 under auxiliary spring 11 effects, main valve plug 7 is fitted with valve pocket 17 subsequently, and blocking-up the second oil pocket 4 is communicated with the first oil pocket 2, and equilibrium valve becomes reverse sealing state again.
In above-mentioned auxiliary spring 11 compression processes, the hydraulic oil being present in auxiliary spring chamber 12 should be released, and for this reason, can on main valve plug 7, form the first oil duct 14, and auxiliary spring chamber 12 is communicated with the first oil pocket 2 by this first oil duct 14.Alternatively, this auxiliary spring chamber 12 also can directly be communicated with fuel tank.
As a kind of preferred implementation of the present utility model, the rigidity of main spring 5 can be less than the rigidity of auxiliary spring 11, thereby main spring 5 is relatively easily compressed, and the unlatching of equilibrium valve is easier.From analyzing above, the rigidity of auxiliary spring 11 plays a decisive role to oil pressure relief, can select as required the auxiliary spring 11 of suitable rigidity.
In the equilibrium valve of the above-mentioned mode of execution of the utility model, be preferably main spring 5, control piston 6, main valve plug 7, auxiliary valve core 8, sub-piston 9 and auxiliary spring 11 are arranged coaxially.
The fundamental function that equilibrium valve of the present utility model is opened, oppositely sealed and oppositely open except realizing forward, also there is relief function.When the second oil pocket 4 oil pressure are when higher, the auxiliary spring 11 of 9 of auxiliary valve core 8 and sub-pistons is further compressed, makes auxiliary valve core 8 contact and be opened with sealing between main valve plug 7, thereby make hydraulic oil overflow to the first oil pocket 2 of the second oil pocket 4, realize overload protection.Equilibrium valve of the present utility model by main valve plug 7 with ingenious cooperation of auxiliary valve core 8 realized relief function, without being set up in parallel individually relief valve, thereby effectively reduce valve volume and weight, make this equilibrium valve install and keep in repair convenient.
On this basis, the utility model also provides a kind of flexible control loop of hydraulic cylinder, comprise oil hydraulic cylinder, the rod chamber of this oil hydraulic cylinder and rodless cavity are connected in selector valve via the first working oil path and the second working oil path respectively, this selector valve is connected in oil-feed oil circuit and oil return circuit, and described the second working oil path is provided with equilibrium valve.Wherein, this equilibrium valve is above-described equilibrium valve, the described forward port A of this equilibrium valve is connected in described selector valve, and described reverse port B is connected in the rodless cavity of described oil hydraulic cylinder, and described control port X is connected with the rodless cavity of described the first working oil path, hydraulic control oil circuit or described oil hydraulic cylinder.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.
In addition, between various mode of execution of the present utility model, also can carry out combination in any, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (12)
1. equilibrium valve, comprising: the valve body (1) that is formed with forward port (A) and reverse port (B); Mangetic core assembly, this mangetic core assembly is slidably received within the hollow cavity of described valve body (1) and is separated out in this hollow cavity and lays respectively at first oil pocket (2) at the axial two ends of described mangetic core assembly and main spring chamber (3) and along circumferential the second oil pocket (4) of this mangetic core assembly, wherein said the first oil pocket (2) is communicated with described forward port (A), described the second oil pocket (4) is communicated with described reverse port (B), is provided with main spring (5) in described main spring chamber (3); And control piston (6), the hydraulic control oil that the control port of described equilibrium valve (X) is introduced can apply the thrust towards described main spring chamber (3) to this control piston (6);
It is characterized in that, described mangetic core assembly comprises main valve plug (7) and is slidably received within auxiliary valve core (8) and the sub-piston (9) in this main valve plug (7), described control piston (6) stretches in described the first oil pocket (2) and under the effect of the hydraulic control oil that can introduce at described control port (X) described auxiliary valve core (8) is applied to the thrust towards described main spring chamber (3), described main spring (5) can apply the thrust towards described the first oil pocket (2) to described sub-piston (9) in described main spring chamber (3), and between described main valve plug (7) and described auxiliary valve core (8), be formed with the 3rd oil pocket (10), the 3rd oil pocket (10) is communicated with described main spring chamber (3) and described the second oil pocket (4) respectively, described auxiliary valve core (8), between described sub-piston (9) and described main valve plug (7), form the auxiliary spring chamber (12) that accommodates auxiliary spring (11), and, from described the first oil pocket (2) to described main spring chamber (3) direction, the external diameter of the part that is positioned at described the second oil pocket (4) of described main valve plug (7) and the part that is positioned at described the 3rd oil pocket (10) of described auxiliary valve core (8) increases respectively,
On described main valve plug (7), be formed with throttling oil duct (13), when described main valve plug (7) slides to described main spring chamber (3) direction, described the first oil pocket (2) can be communicated with described the second oil pocket (4) by described throttling oil duct (13); When described auxiliary valve core (8) slides to described main spring chamber (3) direction with respect to described main valve plug (7), described the first oil pocket (2) is communicated with described the 3rd oil pocket (10).
2. equilibrium valve according to claim 1, is characterized in that, is also formed with the first oil duct (14) on described main valve plug (7), and described auxiliary spring chamber (12) is communicated with described the first oil pocket (2) by this first oil duct (14).
3. equilibrium valve according to claim 1, it is characterized in that, on described main valve plug (7), be also formed with damping hole (15) and the second oil duct (16), described the second oil pocket (4) is communicated with described the 3rd oil pocket (10) by described damping hole (15), and described the 3rd oil pocket (10) is communicated with described main spring chamber (3) by described the second oil duct (16).
4. equilibrium valve according to claim 1, is characterized in that, this equilibrium valve also comprises the valve pocket (17) in the hollow cavity that is installed on described valve body (1), and described main valve plug (7) is slidably received within this valve pocket (17).
5. equilibrium valve according to claim 1, is characterized in that, the rigidity of described main spring (5) is less than the rigidity of described auxiliary spring (11).
6. equilibrium valve according to claim 1, is characterized in that, the external diameter of described sub-piston (9) is greater than the maximum outside diameter of described auxiliary valve core (8).
7. equilibrium valve according to claim 1, is characterized in that, is also provided with for limiting the jump ring (18) of the position that endwisely slips of described sub-piston (9) in described main valve plug (7).
8. according to the equilibrium valve described in any one in claim 1 to 7, it is characterized in that, described main spring (5), described control piston (6), described main valve plug (7), described auxiliary valve core (8), described sub-piston (9) and described auxiliary spring (11) coaxially arrange.
9. according to the equilibrium valve described in any one in claim 1 to 7, it is characterized in that, described throttling oil duct (13) is many cribbings discharge orifice, this many cribbings discharge orifice is arranged along the axial direction of described main valve plug (7), in described main valve plug (7), be formed with the connection oil duct being communicated with described the first oil pocket (2), described many cribbings discharge orifice is communicated with the described oil duct that is communicated with of this main valve plug (7) respectively, and described in each, end opening of throttle orifice is formed on the outer circumferential face of described main valve plug (7).
10. equilibrium valve according to claim 9, it is characterized in that, the hollow cavity as described connection oil duct that being formed with in the end of described the first oil pocket (2) of described main valve plug (7) is communicated with this first oil pocket (2), described in each, throttle orifice connects the sidewall of described hollow cavity, this many cribbings discharge orifice is arranged along the axial direction of described main valve plug (7), and one end relative with described control piston (6) of described auxiliary valve core (8) extend in described the first oil pocket (2) through described hollow cavity.
11. equilibrium valves according to claim 9, is characterized in that, from described the first oil pocket (2) to described main spring chamber (3) direction, the aperture of described many cribbings discharge orifice reduces.
12. flexible control loop of hydraulic cylinders, comprise oil hydraulic cylinder, the rod chamber of this oil hydraulic cylinder and rodless cavity are connected in selector valve via the first working oil path and the second working oil path respectively, this selector valve is connected in oil-feed oil circuit and oil return circuit, described the second working oil path is provided with equilibrium valve, it is characterized in that, described equilibrium valve is according to the equilibrium valve described in any one in claim 1 to 11, the described forward port (A) of this equilibrium valve is connected in described selector valve, described reverse port (B) is connected in the rodless cavity of described oil hydraulic cylinder, described control port (X) and described the first working oil path, the rodless cavity of hydraulic control oil circuit or described oil hydraulic cylinder connects.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420274937.3U CN203856793U (en) | 2014-05-27 | 2014-05-27 | Balance valve and hydraulic cylinder telescoping control loop with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420274937.3U CN203856793U (en) | 2014-05-27 | 2014-05-27 | Balance valve and hydraulic cylinder telescoping control loop with same |
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| CN203856793U true CN203856793U (en) | 2014-10-01 |
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| CN201420274937.3U Expired - Fee Related CN203856793U (en) | 2014-05-27 | 2014-05-27 | Balance valve and hydraulic cylinder telescoping control loop with same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106050775A (en) * | 2016-06-11 | 2016-10-26 | 宁波文泽机电技术开发有限公司 | Pilot control valve of improved structure |
| CN108005789A (en) * | 2017-11-08 | 2018-05-08 | 中国航发北京航科发动机控制系统科技有限责任公司 | A kind of novel fuel distributor with combination valve core |
| CN108953267A (en) * | 2018-08-22 | 2018-12-07 | 东莞海特帕沃液压科技有限公司 | A kind of flow type balanced valve |
| CN109340207A (en) * | 2018-12-19 | 2019-02-15 | 重庆红江机械有限责任公司 | A kind of hydraulic control stop valve |
| CN110360174A (en) * | 2019-06-14 | 2019-10-22 | 常德中联重科液压有限公司 | Valve body, valve rod assembly, balanced valve and the flexible control loop of hydraulic cylinder of balanced valve |
| CN110725819A (en) * | 2019-08-26 | 2020-01-24 | 宁波江北宇洲液压设备厂 | Flow control type variable amplitude balance valve |
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- 2014-05-27 CN CN201420274937.3U patent/CN203856793U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106050775A (en) * | 2016-06-11 | 2016-10-26 | 宁波文泽机电技术开发有限公司 | Pilot control valve of improved structure |
| CN108005789A (en) * | 2017-11-08 | 2018-05-08 | 中国航发北京航科发动机控制系统科技有限责任公司 | A kind of novel fuel distributor with combination valve core |
| CN108953267A (en) * | 2018-08-22 | 2018-12-07 | 东莞海特帕沃液压科技有限公司 | A kind of flow type balanced valve |
| CN108953267B (en) * | 2018-08-22 | 2020-08-14 | 上海昂极仪表科技有限公司 | Flow type balance valve |
| CN109340207A (en) * | 2018-12-19 | 2019-02-15 | 重庆红江机械有限责任公司 | A kind of hydraulic control stop valve |
| CN109340207B (en) * | 2018-12-19 | 2024-01-19 | 重庆红江机械有限责任公司 | Hydraulic control cut-off valve |
| CN110360174A (en) * | 2019-06-14 | 2019-10-22 | 常德中联重科液压有限公司 | Valve body, valve rod assembly, balanced valve and the flexible control loop of hydraulic cylinder of balanced valve |
| CN110725819A (en) * | 2019-08-26 | 2020-01-24 | 宁波江北宇洲液压设备厂 | Flow control type variable amplitude balance valve |
| CN110725819B (en) * | 2019-08-26 | 2021-07-16 | 宁波宇洲液压设备有限公司 | Flow control type variable amplitude balance valve |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141001 Termination date: 20160527 |