CN102748506B - Electro-hydraulic pilot control switch valve bank - Google Patents

Abstract

The invention relates to an electro-hydraulic pilot control switching valve group, which is especially suitable for filling and discharging liquid control of valve-controlled couplings and other equipment with low-pressure and high-flow working characteristics. Aiming at the deficiencies of the existing hydraulic control and differential pressure control valves, the present invention provides an electro-hydraulic pilot control switching valve group, which consists of three main valves with the same structure, three two-position two-way electromagnetic pilot valves and an adapter plate The three main valves are installed in the same valve block, the liquid discharge valve and the stop valve are arranged side by side above the valve block, and the spring chamber is on the top; the liquid filling valve is located in the valve block. Bottom left, the spring chamber is down; the drain valve and the shut-off valve have the same water inlet, the filling valve and the shut-off valve have the same water outlet; the outlets of the three solenoid pilot valves are connected in parallel to the coupling through the outlet of the filling valve and the shut-off valve inside the device. The invention has the advantages of compact structure, simple control mode and large flow rate; the main valve core adopts plane sealing, which has large pressing force and good sealing effect.

Description

Electro-hydraulic pilot control switch valve group

technical field

The invention relates to an electro-hydraulic pilot control switching valve group, which is especially suitable for filling and discharging liquid control of valve-controlled couplers and other equipment with low-pressure and high-flow working characteristics.

Background technique

The valve-controlled coupling uses pure water as the working medium, and the liquid is changed frequently during the working process, and the filling and discharging flow is large. Equipment with such working characteristics requires fast response, large flow rate and reliable action for the control valve group. In the prior art, there are mainly two types of control valves that meet the requirements of low pressure and large flow: hydraulic control type and differential pressure type.

The hydraulic control switch valve uses the control piston to move the piston by the hydraulic pressure of the piston control chamber, and then the switch valve core is opened; when the pressure in the control chamber is released or there is no pressure, the switch valve core is reset and closed by spring force. This control method has no special requirements on the pressure of the medium through the main valve, and the action is simple; at the same time, the control pressure is large, and the main valve moves quickly, but there is a certain impact in the action process. The existing liquid-controlled on-off valves for water media have small flow capacity, poor sealing effect, and the control liquid and flow medium are prone to liquid channeling after a long time.

The upper and lower chambers of the switching valve core of the differential pressure switch valve are connected by a damping hole. When the pilot valve is opened, the liquid flows from the lower chamber of the valve core to the upper chamber of the valve core through the damping hole, and the pressure difference is formed due to the throttling effect of the damping hole, pushing The valve core is opened; when the pilot valve is closed, there is no liquid flow between the upper and lower chambers, the throttling effect of the damping hole disappears, the pressure difference between the upper and lower chambers disappears, and the valve core resets and closes under the action of the spring force. The pressure difference control method does not need to connect the control liquid, and has low requirements on the system; there is no control element such as a control piston, and the structure is relatively simple. Due to the use of small-diameter damping holes, there are certain requirements for the cleanliness of the working medium and the minimum supply pressure to form a sufficient pressure difference to open the valve core.

The existing high-flow on-off control valve has large volume, poor sealing effect, and low reliability, and cannot meet the needs of valve-controlled couplings and other equipment for low-pressure, high-flow valves. The patent number is ZL200720067301.1, and the utility model patent named "Large Flow Electro-hydraulic Control Valve" adopts the principle of reverse operation of the hydraulic control check valve, but its control fluid is the same as the working fluid of the main valve. , the pressure of the control hydraulic pressure decreases with the pressure of the working fluid, which will have an adverse effect on the control performance of the valve core, and its function is single, requiring multiple valves to work together to control the fluid inlet, discharge and working fluid circulation of the coupling, increasing piping connections and equipment volumes.

Contents of the invention

The purpose of the present invention is to provide an electro-hydraulic pilot control switch valve group with large flow capacity, easy control, good sealing effect, compact structure and reliable operation in view of the deficiencies in the prior art.

The technical solution adopted by the present invention to solve the technical problem is: it is composed of three main valves with the same structure, three two-position two-way electromagnetic pilot valves and an adapter plate. The three main valves are liquid filling valve, liquid discharge valve, The stop valve is installed in the valve block, the drain valve and the stop valve are arranged side by side above the valve block, the spring chamber is on the top; the filling valve is located on the lower left of the valve block, and the spring chamber is on the bottom;

The electromagnetic pilot valve is connected to the main valve on the valve block through an adapter plate, the liquid filling valve is connected to the electromagnetic pilot valve, the liquid discharge valve is connected to the electromagnetic pilot valve, and the stop valve is connected to the electromagnetic pilot valve;

The main valve is composed of an upper bonnet, a lower bonnet, a spring, a piston seal, a main valve core, a flat seal and a valve block. Guide rod; the outer circle of the main valve core is embedded in the piston seal, and the end face of the main valve core is embedded in the plane seal; the outer circle part between the piston seal and the plane seal of the main valve core forms a side chamber with the valve block; the spring chamber passes through the inner part of the valve block The pipelines are connected to the inlets of the respective electromagnetic pilot valves, and at the same time communicate with the water inlet and the side cavity of the main valve core through the damping hole; the water inlet of the filling valve is connected with the water inlet of the filling valve on the valve block, and the water inlet of the filling valve is connected with the external water supply Connected; the water inlet of the drain valve and the shut-off valve are connected to the water inlet on the valve block, and the water inlet is connected to the fluid outlet of the coupler; the water outlet of the filling valve and the shut-off valve are connected to the water outlet on the valve block It is connected with the water inlet of the coupler; the water outlet of the drain valve is connected with the water outlet on the valve block, and the water outlet is connected with the outside world.

The beneficial effects of the present invention are: 1. Compact structure. The filling valve, stop valve and liquid discharge valve are integrated into the same valve body, which reduces pipeline connections, reduces volume, reduces weight, and is more convenient for transportation and installation; 2. Good sealing effect. The plane sealing structure is adopted, when the main valve core is closed, the main valve core is pressed tightly on the valve seat by the joint action of the spring force and the upper chamber hydraulic pressure to realize reliable sealing; 3. Reliable action. The main spool is radially sealed by a piston, which on the one hand plays a sealing role, and on the other hand, due to the wide sealing surface, can play a certain guiding role; a guide rod is added to one end of the main spool to strengthen the movement of the main spool. Stability makes the movement of the spool more reliable; 4. Low requirements on the system. Adopt differential pressure pilot control, no need for control pipeline and separate control fluid, which simplifies system configuration; 5. Strong ability to expand applications. The electromagnetic pilot valve is connected to the main valve through an adapter plate. In order to adapt to different working conditions and control requirements, the electromagnetic pilot valve and the adapter plate can be replaced, while other parts of the valve group do not need to be replaced, and the expansion application is very convenient.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the working principle of the present invention.

In the figure: A, electromagnetic pilot valve (normally open), B, electromagnetic pilot valve (normally closed), C, electromagnetic pilot valve (normally closed), 1, adapter plate, 2, upper valve cover, 8, lower valve cover , 3. Spring, 4. Piston seal, 5. Main valve core, 6. Plane seal, 7. Main valve body, I. Filling valve, II. Drain valve, III. Globe valve, a, Damping hole, b . Water outlet of drain valve (to the outside world), c. Water inlet of drain valve and shut-off valve (connected to coupler outlet), d. Water inlet of filling valve (water supply from outside), e. Water outlet (connected to coupling water inlet), m, side cavity, n, spring cavity.

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

As shown in Figure 1 and Figure 2, it is composed of three main valves with the same structure, three two-position two-way electromagnetic pilot valves and an adapter plate 1. The three main valves are liquid filling valve I, liquid discharge valve II, and stop valve. The valve III is installed in the valve block 7, the drain valve II and the stop valve III are arranged side by side above the valve block 7, and the spring chamber is on the top; the filling valve I is located on the lower left of the valve block 7, and the spring chamber is on the bottom;

The electromagnetic pilot valve is connected to the main valve on the valve block 7 through the adapter plate 1, the filling valve I is connected to the electromagnetic pilot valve B, the liquid discharge valve II is connected to the electromagnetic pilot valve C, and the stop valve III is connected to the electromagnetic pilot valve A;

The main valve is composed of upper bonnet 2, lower bonnet 8, spring 3, piston seal 4, main valve core 5, flat seal 6 and valve block 7, the main valve core 5 is a plug-in structure, one end is hollow, and a spring is installed A spring chamber n is formed, and a guide rod is provided at the other end; the outer circle of the main valve core 5 is embedded in the piston seal 4, and the end face of the main valve core 5 is embedded in the plane seal 6; the outer circle between the piston seal 4 and the plane seal 6 of the main valve core 5 Part of it forms a side chamber m with the valve block 7; the spring chamber n is connected to the inlet of each electromagnetic pilot valve through the internal pipeline on the valve block 7, and communicates with the water inlet and the side chamber m of the main valve core 5 through a damping hole; the filling valve The water inlet of I is connected to the water inlet d of the filling valve on the valve block 7, and the water inlet d of the filling valve is connected to the external water supply; the water inlets of the drain valve II and the stop valve III are connected to the water inlet c on the valve block 7, The water inlet c is connected to the coupling liquid outlet; the water outlets of the filling valve I and the stop valve III are connected to the water outlet e on the valve block 7, and the water outlet e is connected to the coupling water inlet; the liquid outlet valve II is connected to the water outlet The water outlet b on the valve block 7 communicates with the outside world.

During work, the electromagnetic pilot valve A is set to normally open, and the electromagnetic pilot valves B and C are set to normally closed; when the system is started, liquid is supplied to the water inlet d of the filling valve from the outside, and the electromagnetic pilot valve B is in a closed state when it is not in action. The flow through the damping hole of filling valve I is zero. At this time, the damping hole has no damping effect. The pressure of the spring chamber of the main valve core of filling valve I is equal to that of the side chamber, and the effective area of the spring chamber is much larger than the effective area of the side chamber. Under the combined action of the hydraulic pressure in the spring chamber and the spring force, the main valve core of the filling valve I is pressed tightly on the valve seat, and the filling valve I is in a closed state. At this time, no liquid enters into the coupler; when the electromagnetic pilot valve When B is powered on, the liquid in the spring chamber of the main valve core of liquid charging valve I is discharged through the electromagnetic pilot valve B and enters the coupler through port e. Due to the throttling effect of the damping hole, the spring chamber and side The pressure difference is formed in the cavity, and the pressure in the spring cavity is significantly lower than the pressure in the side cavity. When the hydraulic pressure in the side cavity overcomes the hydraulic pressure in the spring cavity, the spring force and the friction force, the main valve core of the filling valve I is opened. At this time, the external Feed liquid enters inside the coupler.

When the coupler reaches the rated liquid filling volume, the system starts and turns to normal operation, the liquid in the coupler is in a circulating state, and enters the water inlet c of the drain valve II and the shut-off valve III under the action of centrifugal force, and the solenoid of the shut-off valve III The pilot valve A adopts a normally open valve, and the spring chamber of the main valve core communicates with the water outlet e. Due to the throttling effect of the damping hole, the pressure difference between the spring chamber of the main valve core of globe valve III and the side chamber is formed, and the pressure of the spring chamber is obviously lower than that of the side chamber. Pressure, the hydraulic pressure of the side cavity overcomes the hydraulic pressure, spring force and friction force of the spring cavity, and opens the main valve core of the stop valve III. At this time, the liquid discharged from the coupler through the c port returns to the coupler through the e port . At the same time, the electromagnetic pilot valve A of the drain valve II adopts a normally closed valve, and the flow through the damping hole of the drain valve II is zero. At this time, the damping hole does not play a damping role. The pressure is equal, the effective area of the spring chamber is much larger than the effective area of the side chamber, under the joint action of the hydraulic pressure of the spring chamber and the spring force, the main valve core of the discharge valve II is pressed on the valve seat, and the discharge valve II is closed State, no liquid discharge to the outside world.

When the coupler is draining, the solenoid pilot valve C of the drain valve II is energized to open, and at the same time, the solenoid pilot valve A of the shut-off valve III is energized to close. According to the same principle as above, the liquid in the coupler is discharged through the drain valve. Water port b is discharged to the outside.

Claims (1)

1. An electro-hydraulic pilot control switch valve group is characterized in that: it is composed of three main valves with the same structure, three two-position two-way electromagnetic pilot valves and an adapter plate (1), and the three main valves are liquid-filled The valve (I), drain valve (II) and shut-off valve (III) are installed in the valve block (7), the drain valve (II) and the shut-off valve (III) are arranged side by side above the valve block (7), and the spring The cavity is on the top; the filling valve (I) is located at the lower left of the valve block (7), and the spring cavity is on the bottom; The solenoid pilot valve is connected to the main valve on the valve block (7) through the adapter plate (1), the filling valve (I) is connected to the solenoid pilot valve B, the liquid discharge valve (II) is connected to the solenoid pilot valve C, and the stop valve (III) Connect with electromagnetic pilot valve A; The main valve is composed of upper bonnet (2), lower bonnet (8), spring (3), piston seal (4), main valve core (5), flat seal (6) and valve block (7). The core (5) is a plug-in structure, one end is hollow, and a spring is installed to form a spring chamber (n), and the other end is provided with a guide rod; the outer circle of the main valve core (5) is embedded in the piston seal (4), and the main valve core (5) ) end face is embedded into the plane seal (6); the outer circle part between the piston seal (4) of the main valve core (5) and the plane seal (6) forms a side chamber (m) with the valve block (7); the spring chamber (n ) through the internal pipeline on the valve block (7) is connected with the inlet of each electromagnetic pilot valve, and communicated with the water inlet through the damping hole, and communicated with the side chamber (m) of the main valve core (5) through the damping hole; the filling valve The water inlet of (I) is connected to the filling valve water inlet (d) on the valve block (7), and the filling valve water inlet (d) is connected with the external water supply; the inlet of the drain valve (II) and the shut-off valve (III) The water ports are all connected to the water inlet (c) on the valve block (7), and the water inlet (c) is connected to the fluid outlet of the coupler; the water outlets of the filling valve (I) and the shut-off valve (III) are connected to the valve block (7 ) on the water outlet e, and the water outlet e communicates with the water inlet of the coupler; the water outlet of the drain valve (II) communicates with the water outlet b on the valve block (7), and the water outlet b communicates with the outside world.

Images