CN87202245U

CN87202245U - Pluggable balance valve

Info

Publication number: CN87202245U
Application number: CN 87202245
Authority: CN
Inventors: 黄共才
Original assignee: Changsha Engineering Machinery & Hydraulic Parts Plant
Current assignee: Changsha Engineering Machinery & Hydraulic Parts Plant
Priority date: 1987-02-16
Filing date: 1987-02-16
Publication date: 1987-12-31

Abstract

The utility model relates to a pluggable balance valve, which is suitable for hydraulic circuits of the lifting mechanism, the derricking mechanism, the telescopic mechanism and other mechanisms of a hydraulic hoist. The pluggable balance valve mainly comprises a valve body [1], a valve seat [2], a main valve core [3], a guide valve core [4], a control valve core [5], a valve cover [6], a damper [7], a damping hole [8]and a spring [9]. The main valve core is plugged in the barrel cavity of the valve seat, and the guide valve core is plugged in the barrel cavity of the main valve core. The utility model has the advantages of simple structure, compact structure, small volume, light weight, high stability, easy fabrication and good versatility. The pluggable balance valve can be directly installed on the oil inlet part of a motor or an oil cylinder and integrated together with an executable element. The pluggable balance valve reduces the volume of the load cavity and is easy to realize the seriation, the micromation and the integration.

Description

Pluggable balance valve

The utility model relates to a kind of improved equilibrium valve, is suitable for use on the oil hydraulic circuit of lifting mechanism, jib lubbing mechanism, extending means and other similar means of hydraulic hoist, plays balanced loaded gravity and loading speed.

Existing equilibrium valve generally adopts outer folded formula to install by one-way valve, throttle valve, control valve three and combines, and existing problem is a complex structure, and volume is bigger, is not easy to be directly installed on the filler opening place of motor or oil cylinder, but adopts pipeline to connect.Like this, pipeline increases, and not only makes complex system, reduces functional reliability, and because pipe leakage of oil and pipe break, influences the service behaviour of equilibrium valve and dangerous easily.In addition, existing equilibrium valve both domestic and external, its control mode is direct-type control, promptly by the direct control orifice aperture of control spool size, the problem that exists is that the spring rate that is complementary with control hydraulic pressure is big, therefore the structure of valve is huge thereupon, and static properties is relatively poor, and dynamic stability was undesirable when machine was handled suddenly.

The purpose of this utility model provides a kind of cartridge balanced valve, with simplification equilibrium valve structure, and reduced volume, weight reduction, the convenient installation improved the stability and the Security of system, cuts down finished cost simultaneously, makes it to be convenient to seriation, microminiaturization and integrated.

The utility model is made up of valve body (1), valve seat (2), main valve plug (3), guide's spool (4), control spool (5), valve gap (6), damper (7), spring (9).

Below in conjunction with accompanying drawing the utility model is described in detail.

Fig. 1 is the sectional view of cartridge balanced valve.Wherein, 1---valve body, 2---valve seat, 3---main valve plug, 4---guide's spool, 5---the control spool, 6---valve gap, 7---damper, 8---damping hole, 9---spring,

The equilibrium valve that the utility model proposed, valve body (1) has inner chamber; Valve seat (2) is the cylindrical drum structure, opens several through holes on its circumference, and valve seat is inserted in the inner chamber of valve body, and can move up and down along its surface of internal cavity; Main valve plug (3) also is the cylindrical drum structure, and tube has an inverted cone boss in the chamber, and the boss middle part has through hole, and circumference upper edge, the lower end helix of main valve plug has a plurality of small through hole, and main valve plug is inserted in the tube chamber of valve seat, and can move up and down along surface, tube chamber; The bottom of guide's spool (4) is a cylindrical body, in radially duct and axial channel are arranged, cylindrical body can move up and down at main valve plug boss through-hole inner surface, the middle part of guide's spool is coniform, the conical surface forms line with main valve plug boss plane and contacts, and to guarantee intact sealing, top is connected with control spool (5) joint, when control moves on the spool, can drive guide's spool and move on together; Valve gap (6) has damping hole (8), and spring (9) is contained between valve gap the inner and the guide's spool frustum plane, and damper (7) is contained in control spool upper end, and its surface of internal cavity has spiral chute.

The course of work of this balanced valve is: when pressure oil entered balanced valve from oil-in, under the effect of oil pressure, valve seat was opened, and pressure oil flows out through oil-out, and this moment, balanced valve was used as check valve; When oil-in stopped oil-feed, under the effect of spring and oil pressure, valve seat was closed, and balanced valve is in blocking; When the oil-feed of control mouth, the control oil damping hole of flowing through enters control spool lower end, the control spool is moved up, thereby driving guide's spool moves up, the a part of oil of the main valve plug epicoele pilot valve restriction of flowing through flows back to fuel tank, and main valve plug epicoele oil pressure descends, under the differential pressure effect, main valve plug also upwards raises, and makes the oil main valve plug spiral through hole of flowing through flow back to fuel tank. If backhaul is too fast, when oil pump feed has little time, the control mouth pressure will descend, and guide's spool is tending towards closing under spring-force driven dual, the main valve plug upper cavity pressure is raise, thereby make main valve plug also be tending towards closing, and opening speed therefore can slow down. If the operator in manipulation process, handles suddenly reversal valve, when pressure oil entered suddenly the control mouth, because the effect of damping hole and damper slowly raises spool, thereby the assurance opening speed was not undergone mutation the raising dynamic stability.

From the above, the utility model is compared with existing balanced valve, has following advantage:

(1), simplifies the structure of balanced valve, dwindled volume, alleviated weight. General balance Valve is folded assembly outward by check valve, choke valve, control valve and is formed, complex structure, and volume is big and relatively benzene is heavy. The utility model adopts simple plug-in structure, has not only simplified the structure of valve, and its volume and weight is greatly reduced;

(2) the hydraulic coupling feedback is adopted in main valve plug action of the present utility model.Thereby can reduce the spring rate of guide's spool significantly, selected initial tension of spring is littler 10～15 kilograms than general equilibrium valve, has not only reduced volume, and has improved dynamic stability.

(3) plug-in mounting equilibrium valve provided by the utility model, because it is simple and compact for structure, volume is little, in light weight, so can be directly installed on the filler opening of motor or oil cylinder, integrated with executive component, thus the volume of load cavity reduced, the stability and the Security that help improving system, simplify system simultaneously, be convenient to realize seriation, microminiaturization and integrated.

Claims

1, a kind of cartridge balanced valve, it is by valve body [1], valve seat [2], main valve plug [3], guide's spool [4], control spool [5], valve gap [6], damper [7], damping hole [8] constitute, it is characterized in that controlling spool [5] upper end damper [7] is housed, control spool [5] is removable the connection with guide's spool [4], guide's spool [4] is inserted in the tube chamber of main valve plug [3], and main valve plug [3] is inserted in the tube chamber of valve seat [2].

2,, it is characterized in that described damper (7) surface of internal cavity has spiral chute according to the described cartridge balanced valve of claim 1.

3,, it is characterized in that described main valve plug (3) lower circumference upper edge helix has a plurality of through holes according to the described cartridge balanced valve of claim 1.

4,, it is characterized in that there is an inverted cone boss at described main valve plug (3) middle part according to the described cartridge balanced valve of claim 1.

5, according to claim 1 and 4 described cartridge balanced valves, it is characterized in that described main valve plug (3) boss middle part has through hole, the small end circumference upper edge helix of main valve plug has a plurality of small through hole, and main valve plug is inserted in the tube chamber of valve seat, and can move up and down along surface, tube chamber.