The model utility content
The utility model technical problem to be solved is to provide a kind of simple and compact for structure, and pressurize consumes few no leakage type Pneumatic and hydraulic selector valve.
Its technical problem to be solved can be implemented through following technological scheme.
A kind of no leakage type Pneumatic and hydraulic selector valve comprises valve body 5 and changeover valve core 4, and said changeover valve core 4 is fixed on the pneumatic piston 3 of a spring reset cylinder, and forms the piston rod of said spring reset cylinder.
As the further improvement of present technique scheme, said spring reset cylinder is a single-piston rod stretched spring reset cylinder.
As the further improvement of present technique scheme, this hydraulicdirectional control valve also comprises a valve gap 1, and Returnning spring 2 one ends of said spring reset cylinder are connected to the head of said pneumatic piston 3, and the other end is connected on the inwall of said valve gap 1.
As one of preferred embodiment of the utility model; Form the first sealing cone valve 14 and the second sealing cone valve 15 on the body of said changeover valve core 4; One end of said first sealing cone valve 14 and the second sealing cone valve, 15 less external diameters is arranged in opposite directions; Changeover valve core body outer rim between the said first sealing cone valve 14 and the second sealing cone valve 15 forms an annular outer-cavity 16 that serves as the liquid paths, and the outer cover of said annular outer-cavity 16 is provided with valve pocket 6; Shift to install oil inlet passage, working oil passage and drainback passage on the said valve body 5 perpendicular to valve axis; Wherein said working oil passage is connected with said annular outer-cavity 16; Said oil inlet passage is connected with said valve pocket 6 lower openings, and said drainback passage is connected with said valve pocket 6 upper openings; Said annular outer-cavity 16 contacts or seals contacting of cone valve 15 and valve pocket 6 lower openings through said second through said first sealing cone valve 14 and valve pocket 6 upper openings, optionally is connected with said oil inlet passage or drainback passage.
Further, said changeover valve core 4 has one section hourglass shape body, and two conical surfaces up and down of said hourglass shape body form the said first sealing cone valve 14 and the second sealing cone valve 15 respectively.
In addition, on said oil inlet passage, can be provided with an one-way valve.
Preferably, the nonreturn valve core 9 of said one-way valve is the mushroom head dummy.
Adopt the no leakage type Pneumatic and hydraulic selector valve of technique scheme; Come the switching-over spool is controlled through a pneumatic piston; And then realize the pneumatic control of no leakage type hydraulicdirectional control valve, through being arranged on no air pressure and having under the atmospheric pressure state changeover valve core different working state (station) realize more economical, more energy-conservation switch operation task.
Description of drawings
Below in conjunction with accompanying drawing the embodiment of the utility model being done one specifies.
Fig. 1 is the structural representation of the utility model;
---lid 2---spring 3---pneumatic piston 4---changeover valve core 5---valve body 6---valve pocket 7---jackscrew 8---check valve body 9---nonreturn valve core 10---Returnning spring 11---unidirectional valve seat 12---plug 13---nut 14,15---cone valve 16---annular outer-cavity 17---atmospheric pressure cavities among the figure: 1
Code name explanation among the figure:
AP: drive the air pressure supplying mouth;
R: valve oil return hydraulic fluid port;
A: valve working oil hydraulic fluid port;
P: valve oil-feed hydraulic fluid port;
AR: from A to R, switch valve port;
PA: from P to A, switch valve port;
Embodiment
No leakage type Pneumatic and hydraulic selector valve structure as shown in fig. 1, the following several assemblies of the utility model integrated assembling on valve body 5:
P mouth check valve assembly: be made up of check valve body 8, nonreturn valve core 9, Returnning spring 10, unidirectional valve seat 11 and 2 seal rings, integral body directly is inserted on the valve body;
Pneumatic drive piston assembly: be connected on the changeover valve core 4 through nut 13 by lid 1, spring 2, pneumatic piston 3, be assembled on the valve body 5 through sealing;
Switching valve core assembly: form by changeover valve core 4, valve pocket 6, plug 12, be assembled in the valve body 5, pressure measurement or the overflow reserved opening of jackscrew 7 for communicating with the A mouth.
Wherein, pneumatic piston 3 directly is connected with changeover valve core 4, by spring 2 hold modes, directly drives the realization switch motion by air pressure, and is simple in structure, and it is reliable to be active in one's movements.
At the P of valve mouth, its one-way valve adopts mushroom head dummy structure, and its ball face sealing effect is equal to the steel ball sealing effect; Realize that the P mouth does not have leakage, under equal specification valve port bore, this structure one-way spool 9 is compared with the same specification steel ball simultaneously; Weight is lighter, and inertia is little, and reaction is sensitive more.
Switching valve port PA mouth and AR mouth employing conical surface seal, reliable and stable, satisfy and stablize contact seal under the working state, dead-tight target.
On function, use the no leakage type Pneumatic and hydraulic selector valve of the utility model structure, the alternative traditional guiding valve and the switching and the pressure of hydraulic lock realization keep function, and particularly in Clamping system, system is simpler and compact.
Be the open type structure shown in the accompanying drawing 1, under the packing state, need not other any power consumption at work; Can realize that pressure keeps, when needs switch, only need add air pressure to the AP mouth; Pressed gas gets in the atmospheric pressure cavity 17, and then promotion pneumatic piston 3 moves up; Changeover valve core 4 switches the back air pressure balance, and state keeps always, and consumed power is very little, satisfies the trend demand of present energy-saving and emission-reduction.Because the top of piston has been the spring 2 of reset response, the changeover valve core 4 of bottom has formed the effect of piston rod in fact, thereby formed cylinder is essentially a single-piston rod stretched spring reset cylinder; Can certainly adopt other cylinder form; Optionally open or block AR valve port or PA valve port as long as satisfy the cone valve 14 of changeover valve core 4 bodies upper end and the cone valve 15 of body lower end through the effect of cylinder or spring 2; And then accomplish the lower ending opening of the annular cavity 16 liquid paths that forms through valve pocket 6 and be communicated with oil-feed hydraulic fluid port P, the open upper end of perhaps passing through valve pocket 6 gets final product with the task that oil return hydraulic fluid port A is communicated with; And, also just realized the commutation function of hydraulic pressure because working oil hydraulic fluid port A is connected with annular outer-cavity 16.
Changeover valve core 4 stage casing similar among the figure are in the hourglass shape structure, and two frustum surfaces have formed two sealing cones up and down, and the periphery, stage casing has formed an annular outer-cavity that supplies fluid to flow.
Its working state is: under the normally open of accompanying drawing 1, the AP mouth is under the situation of no air pressure, and P mouth and A mouth communicate, and the PA valve port is opened, and A mouth and R mouth are closed, and the AR valve port is closed, and passes through P mouth one-way valve and PA valve port and working hole A from the pumping system high pressure oil and is communicated with; Switching the ventilation of AP mouth presses; Air pressure overcomes coupling mechanism force and the switching part seal friction power that spring 2, oil pressure cross section difference cause, and promotes changeover valve core 4 upwards, and the AR valve port is opened; The PA valve port is closed simultaneously; A mouth working oil is returned fuel tank through the R mouth, and P mouth pressure source is isolated by the PA mouth, and PA implication equilibrium valve system state kept after switching was accomplished.After the AP implication was pressed release, spring 2 promoted changeover valve core 4 assemblies and switches, and returns the front and describes the working state of AP mouth at no air pressure.
The utility model is through optimizing P mouth one-way valve in the valve, and realization nonreturn valve core 9 is compared with the same specification steel ball, and weight is lighter, more compact structure, and inertia is little, and the opening and closing pressure difference is littler, and reaction is sensitive more.Through optimization to PA mouth and AR mouth and changeover valve core 4 and valve pocket 6 sectional dimensions; Realize the balance of each valve port oil pressure in switching; Because the pressure reduction coupling mechanism force that causes of pressure is very little, than small size pneumatic piston 3 and lower driving air pressure under, switch motion is sensitive reliable.
This selector valve compact structure, technology capability is good, needing in the Clamping system on function, to be very suitable for the operating mode of long-time pressurize, and power consumption that need not be any under the pressurize working state.