CN201003518Y

CN201003518Y - Pilot valve

Info

Publication number: CN201003518Y
Application number: CNU2006201674074U
Authority: CN
Inventors: 沈雪松
Original assignee: FENGHUO MACHINE WORKS OF CHINA AEROSPACE SCIENCE AND TECHNOLOGY Corp
Current assignee: FENGHUO MACHINE WORKS OF CHINA AEROSPACE SCIENCE AND TECHNOLOGY Corp
Priority date: 2006-12-11
Filing date: 2006-12-11
Publication date: 2008-01-09
Anticipated expiration: 2016-12-11

Abstract

The utility model relates to a priority valve, which comprises a valve body and one or more than one two position three-way valve core, and the valve core is positioned in the valve bode as a whole, and the valve sleeve of the valve core is fixedly connected with the valve body. The valve core still comprises a cushion equipment, a mandrel, a seat valve type sealing mechanism and a reposition spring equipment. One end of the mandrel is used for placing the cushion equipment, and the other end acts on the seat valve type sealing mechanism. The reposition spring equipment acts on the seat valve type sealing mechanism. A shuttle rod supported the space between the two balls of the eat valve type sealing mechanism, which ensures the single ball sealing in static state. The liquid inlet valve seat and the liquid returning seat and the opening cooperated with the ball form the liquid inlet and liquid returning opening of the valve, and when the valve is in static state, one of two openings is communicated with the working cavity to form a three way function of the valve. The priority valve of the utility model has a simple and reliable structure, is easy for manufacturing and has a long service life and a low price.

Description

A kind of pilot valve

Technical field

The utility model has related to a kind of pilot valve, is used for the hydraulic system of digging up mine.

Background technique

Pilot valve is used for colliery support electrohydraulic control system, is one of key element of system's electricity-liquid conversion, and it constitutes the type pilot selector valve with main valve.

Colliery support electrohydraulic control system is that coal is combined and to be adopted one of capital equipment of automation, just forms ripe product abroad more than ten years before, thus aspect the pilot valve of electrohydraulic system separately manufacturer oneself approved product is all arranged.Some difference on the pilot valve structure of companies such as DBT and Marco, JOY, OHE, EEP, DAMS, Tiefenbach wherein, but all be the solenoid directional control valve of a two-position three way concerning function, flow is little, the pressure-bearing height.

External product is promoted on the generality based on German product, and German product structurally has certain approximate, wherein, Germany DBT Automation GmbH number is 97194999.9 in Chinese patents, the electro-hydraulic control valve electromagnet action that name is called in the patent of invention of electro-hydraulic control valve is simple, direct dynamic structure, spool is partly with a spring shock absorption structure, the effect of electromagnet armature push rod is on it, two push rods promote that seal moves and the open and close that reach each valve port during valve events, realize the function of two-position three way.This DBT pilot valve structure has certain advance, particularly spring vibration damper on performance evaluation and use condition.But from the angle of processing and material assurance, this valve core structure more complicated requires processing and assembly precision higher.It has adopted dull and stereotyped sealing means on sealing configuration, and to the requirement on machining accuracy height, the impact on opposite acts directly on the seal sealing surface during action, and descend to working life.And the valve flow is little, and through-flow openings is little, and two actuating rods are corresponding very little, and assembling acquires a certain degree of difficulty, and is difficult for guaranteeing.

The model utility content

Technical problem to be solved in the utility model is: overcome the deficiencies in the prior art, provide a kind of simple and reliable for structure, easy to manufacture, the life-span is long, cheap pilot reversing valve.

Technical solution of the present utility model is: a kind of pilot valve, the spool that comprises valve body and one or more two-position three ways, spool integral body is packed in the valve body, the valve pocket of spool is fixedlyed connected with valve body, it is characterized in that: spool also comprises damping device, push rod, seat valve formula sealing configuration, return spring device, one end of push rod is placed damping device, and the other end acts on the seat valve formula sealing configuration, and the return spring device acts on the seat valve formula sealing configuration.

Described seat valve formula sealing configuration comprises back liquid valve seat, feed liquor valve seat, two spheroids and supports the shuttle bar of two spheroids that the opening that feed liquor valve seat, time liquid valve seat cooperate with spheroid respectively constitutes the liquid entering hole and the liquid return hole of pilot valve.

Described damping device comprises damping spring, compresses plug screw, joint, jacking block, lining, and damping spring is compressing between plug screw and the jacking block, compresses plug screw and fixedlys connected with lining, and lining is positioned at joint, and joint is fixedlyed connected with valve pocket.

Described return spring device comprises return spring, spring guide, spring seat, and return spring is positioned at spring guide, and spring seat is fixed on the valve pocket by fastening piece.

Described shuttle bar is provided with separate pins, and the shuttle bar is play the guiding role, and has oil through or groove on the separate pins, communicates with active chamber.

Distance when the length of described shuttle bar is pressed to back liquid valve seat and feed liquor valve seat simultaneously greater than two spheroids between two spheroids.

Between described feed liquor valve seat, time liquid valve seat and active chamber, filter screen is set.

Advantage of the present utility model is in following several respects:

(1) adopt seat valve formula sealing configuration, push rod and pilot valve spheroid adopt split-type structural, so both can reduce difficulty of processing, can guarantee that again the highi degree of accuracy of spheroid and valve seat cooperates requirement, have reduced frictional force, have improved reliability;

(2) adopt a kind of damping spring, alleviate the impact of jacking block, make the pilot valve action more steady, when also having reduced simultaneously the pilot valve action to corresponding impact injury, life-saving;

(3) at the admission chamber and the active chamber place of pilot valve filter screen is housed all, prevents that impurity and dirt from entering in the valve, reduced the damage of impurity simultaneously, improve the life-span valve seat.

Description of drawings

Fig. 1 is the sectional view of the utility model pilot valve.

Wherein, 1, embedded piece 2, zero type circle 3, zero type circle 4, push rod 5, return fluid cushion sheet 6, spheroid 7, return liquid valve seat 8, feed liquor valve seat 9, zero type circle 10, feed liquor pad 11, spring seat 12, spring guide 13, filter screen 14, return spring 15, gland nut 16, shuttle bar 17, filter screen 18, separate pins 19, joint 20, lining 21, jacking block 22, valve body 23, spring bolt 24, damping spring 25, compress plug screw 26, spring bolt 27, valve pocket

Embodiment.

As shown in Figure 1, a kind of pilot valve of the present utility model comprises the changeover valve core 1 of a valve body 22 and a two-position three way, spool 1 integral body is packed in the valve body 22, the valve pocket 27 and the valve body 22 of spool 1 are fixed by the screw knob that has spring bolt 23, and the tapped hole of valve body 22 is coaxial with the center of spool 1, push rod 4 transmits the thrust that compresses plug screw 25 after damping spring 24 cushioning effects, is supported by a shuttle bar 16 between two spheroids 6, guarantees static single ball sealing constantly.Feed liquor valve seat 8, return feed liquor and liquid return hole that opening that liquid valve seat 7 cooperates with spheroid 6 constitutes valve, during valve static state one of two mouthfuls with the active chamber communication, formed the threeway function of pilot valve.

Have the liquid entering hole of a highly pressurised liquid on the valve body 22, a liquid return hole that is communicated with system liquid return pipe road, a high pressure liquid outlet of giving cylinder body or moving piston cavity feed flow, push rod 4, support shuttle bar 16 between two spheroids 6 and two spheroid 6, feed liquor valve seat 8 and time liquid valve seat 7 constitute seat valve formula sealing configurations, spheroid 6 lays respectively at go back to liquid valve seat 7 and feed liquor valve seat 8 places, spheroid 6 can move, the hole that leading role is arranged at motor segment, the hole is positioned at back on fluid cushion sheet 5 and the feed liquor pad 10, return fluid cushion sheet 5 and return liquid valve seat 7 and can be integrated and adopt a single piece, feed liquor pad 10 also can be integrated with feed liquor valve seat 8 and adopt a single piece.Returning liquid valve seat 7 can be identical with feed liquor valve seat 8 structures, and fasten mutually, be provided with liquid-through hole between buckling surface, two spheroids 6 and shuttle bar 16 keep in touch at any one time and are in aggregates when valve events, in the radially a small amount of relative displacement between two spheroids 6 of tolerable and the shuttle bar 16.

The distance of 6 of two spheroids when the length of shuttle bar 16 is pressed to back liquid valve seat 7 and feed liquor valve seat 8 simultaneously greater than two spheroids 6, sealing when length assurance spheroid 6 single balls of shuttle bar 16 contact respective valve seat, function is cut off in the isolation that reaches liquid entering hole and liquid return hole, shuttle bar 16 is furnished with the separate pins 18 of tape guide effect, joins liquid-through hole or groove on the separate pins 18.Separate pins 18 guarantees to link up with relative fixed of returning liquid valve seat 7 and feed liquor valve seat 8 inner chambers and intermediate liquid road, reaches the function that active chamber communicates with one of liquid entering hole or liquid return hole at any one time.

The return spring device comprises return spring 14, spring guide 12, spring seat 11, and return spring 14 is positioned at spring guide 12, and spring seat 11 is fixed on the valve pocket 27 by fastening piece.One end of feed liquor valve seat 8 place's spheroids 6 is held up by spring guide 12.

Pilot valve has added the damping device of spring action at the direct point of action of external force place, damping device comprises damping spring 24, compresses plug screw 25, joint 19, jacking block 21, lining 20, damping spring 24 is compressing between plug screw 25 and the jacking block 20, compressing plug screw 25 fixedlys connected with lining 20, lining 20 is positioned at joint 19, and joint 19 is fixedlyed connected with valve pocket 27.Damping device plays damping effect, prolongs the working life of pilot valve.6 arbitrary moment of two spheroids all keep the two-way push rod in the pilot hole to clamp, the shuttle bar 16 that push rod 4, spring guide 12 and spheroid are 6 constitutes the motion pressure pin of two spheroids 6, pilot hole and liquid entering hole, liquid return hole are concentric, and the automatic centering seal action is arranged during to spheroid contact aperture.

For reliably working and the life-saving that guarantees valve, prevent that impurity and dirt from entering in the valve, valve body 22 has the admission chamber of logical high pressure liquid in spool 1 endoporus bottom, at the admission chamber place filter screen 13 is housed, return liquid valve seat 7 and feed liquor valve seat 8 and have the liquid-through hole that leads to the working solution road, add filter screen 17 herein.

On pilot valve, also be provided with zero type circle (2,3,9), be used for sealing.

The working condition of the utility model pilot valve is as follows:

When being in original state, when being the described state of Fig. 1, the 8 lower end perforates of feed liquor valve seat are cut off by the ball seal that return spring 14 acts on the inlet opening runner of process filter screen 13, return spring 14 active forces also return spheroid 6 on the liquid valve seat 7 by shuttle bar 16 jack-up when compressing above-mentioned spheroid, make through the active chamber of filter screen 17 to link up with the sap cavity that returns that returns the 7 top perforates of liquid valve seat.This moment, valve was in the original state under the no external force effect, and the high pressure admission chamber is returned sap cavity and active chamber and links up by shutoff.

Valve is wanted breakdown action, promptly when electric control equipment or manually-operable, compress plug screw 25 stressed moving down, compression damping spring 24 makes its power transmission, arriving back liquid valve seat 7 place's spheroids 6 through push rod 4 reaches to shuttle bar 16, arrive the spring guide 12 of feed liquor valve seat 8 place's spheroids 6 then up to return spring 14 jack-up, described external force overcomes return spring power through this transmission moves downward two spheroids 6 and shuttle bar 16, and then return liquid valve seat 7 place's spheroids 6 and compress this valve seat, feed liquor valve seat 8 place's spheroids 6 move down and connect admission chamber simultaneously.This moment, valve was in the opening state under the external force effect, returned sap cavity by shutoff, and the high pressure admission chamber communicates with active chamber.

When electromagnetic control apparatus or manually-operable stopped, because two spheroids 6 and shuttle bar 16 and push rod 4 all move up under return spring 14 active forces, final valve was got back to original state, and valve cuts out.

Spool quantity of the present utility model can be one or more, pilot valve shown in the above-mentioned embodiment is a kind of situation of the present utility model, those skilled in the art can carry out under the situation of the present utility model variously augmenting, improving and change not departing from according to different designing requirements and design parameter, therefore, the utility model is widely.

Claims

1, a kind of pilot valve, the spool (1) that comprises valve body (22) and one or more two-position three ways, spool (1) integral body is packed in the valve body (22), the valve pocket (27) of spool (1) is fixedlyed connected with valve body (22), it is characterized in that: spool (1) also comprises damping device, push rod (4), seat valve formula sealing configuration, return spring device, one end of push rod (4) is placed damping device, and the other end acts on the seat valve formula sealing configuration, and the return spring device acts on the seat valve formula sealing configuration.

2, a kind of pilot valve according to claim 1, it is characterized in that: described seat valve formula sealing configuration comprises back liquid valve seat (7), feed liquor valve seat (8), two spheroids (6) and supports the shuttle bar (16) of two spheroids (6) that the opening that feed liquor valve seat (8), time liquid valve seat (7) cooperate with spheroid (6) respectively constitutes the liquid entering hole and the liquid return hole of pilot valve.

3, a kind of pilot valve according to claim 1 and 2, it is characterized in that: described damping device comprises damping spring (24), compresses plug screw (25), joint (19), jacking block (21), lining (20), damping spring (24) is positioned at and compresses between plug screw (25) and the jacking block (20), compressing plug screw (25) fixedlys connected with lining (20), lining (20) is positioned at joint (19), and joint (19) is fixedlyed connected with valve pocket (27).

4, a kind of pilot valve according to claim 1 and 2, it is characterized in that: described return spring device comprises return spring (14), spring guide (12), spring seat (11), return spring (14) is positioned at spring guide (12), and spring seat (11) is fixed on the valve pocket (27) by fastening piece (15).

5, a kind of pilot valve according to claim 3, it is characterized in that: described return spring device comprises return spring (14), spring guide (12), spring seat (11), return spring (14) is positioned at spring guide (12), and spring seat (11) is fixed on the valve pocket (27) by fastening piece (15).

6, a kind of pilot valve according to claim 2 is characterized in that: described shuttle bar (16) is provided with separate pins (18), and shuttle bar (16) is play the guiding role, and separate pins has oil through or groove on (18), communicates with active chamber.

7, a kind of pilot valve according to claim 2 is characterized in that: the distance the when length of described shuttle bar (16) is pressed to back liquid valve seat (7) and feed liquor valve seat (8) simultaneously greater than two spheroids (6) between two spheroids (6).

8, a kind of pilot valve according to claim 2 is characterized in that: between described feed liquor valve seat (8), time liquid valve seat (7) and active chamber filter screen (17) is set.

9, a kind of pilot valve according to claim 1 is characterized in that: the valve pocket (27) of described spool (1) and valve body (22) are when fixedlying connected, and the mounting hole of valve body (22) is coaxial with the center of spool (1).