CN102817877A - Water switch control valve - Google Patents

Abstract

The invention provides a water pressure switch control valve, comprising a main valve core, a main valve body, a valve cover, a pilot valve core and a pilot valve body, the pilot valve body is installed between the main valve core and the valve cover, and the pilot valve valve The core passes through the bonnet and is pressed on the pilot valve body, the main valve core, the pilot valve body and the main valve body form a pilot valve circuit, and the pilot valve spool controls the on-off of the pilot valve circuit. There is a damping hole in the pilot valve circuit, and the damping hole is located on the main valve core and communicates with the upper cavity and the lower cavity of the main valve core. The on-off valve adopts a pilot-operated structure, which makes the opening and closing of the valve more stable. The main valve core adopts a flat valve structure, and the pilot valve adopts a cone valve structure, which has good sealing performance, and the pressure difference formed before and after the damping hole acts on the main valve core. On the other hand, opening the main valve port is beneficial to reduce the opening control force, especially suitable for occasions with high system pressure and large flow.

Description

A water pressure switch control valve

technical field

The invention relates to a water pressure switch control valve used in a water hydraulic transmission system, which is especially suitable for the occasion of high pressure and large flow, and is used to control the on-off of the liquid flow.

Background technique

Water-hydraulic transmission technology has the advantages of cleanness, environmental protection, flame retardancy, and good compatibility with products, and has broad application prospects. In the water hydraulic system, the on-off valve is a basic control element, and its performance has a great influence on the reliability of the water hydraulic system. At present, most of the water hydraulic systems use direct-acting electromagnetic switch valves. The opening of the valve is realized by the electromagnetic force generated by the electromagnet directly acting on the valve core, and the closing of the valve core is driven by the reset spring force of the valve core. , so it is not suitable for occasions with high system pressure and large flow.

Contents of the invention

The present invention mainly aims at the above-mentioned shortcomings of the direct-acting electromagnetic switch valve, and provides a manual switch valve for use in occasions with high system pressure and large flow. Liquid flow direction control.

The invention provides a water pressure switch control valve, which includes a main valve core, a main valve body and a valve cover, and is characterized in that it also includes a pilot valve core and a pilot valve body, and the pilot valve body is installed on the main valve core and the valve Between the covers, the pilot valve spool passes through the valve cover and presses on the pilot valve body. The main valve core, pilot valve body and main valve body form a pilot valve circuit, and the pilot valve spool controls the on-off of the pilot valve circuit.

Further, the pilot valve circuit is a fluid channel circuit, and there is a damping hole in the circuit, and the damping hole is located on the main valve core and communicates with the upper chamber and the lower chamber of the main valve core.

Further, between the main valve core and the main valve body, between the pilot valve body and the main valve core, between the pilot valve core and the valve cover, between the pilot valve body and the main valve body, between the valve cover and the main valve body The space is sealed with TX engineering plastic sealing ring.

Further, the main valve core is made of 30% carbon fiber reinforced polyether ether ketone, and is pressed against the valve seat hole of the main valve body by the main valve spring.

Further, it also includes a handle, which is connected with the pilot spool, and the handle can be turned to open or close the pilot spool.

Further, both the pilot valve body and the valve cover are screwed onto the main valve body through threads.

Compared with the existing direct-acting hydraulic switch valve, the present invention has the following advantages:

1. The on-off valve adopts manual control mode, which saves labor and can better overcome the problems of heat generation when the solenoid valve is working, limited application range and poor reliability due to limited suction.

2. The on-off valve adopts a pilot-operated structure, which makes the opening and closing of the valve more stable. The main valve core adopts a flat valve structure, and the pilot valve adopts a cone valve structure, which has good sealing performance.

3. The main spool of the on-off valve and the valve body hole are sealed with TX engineering plastic sealing ring, which has a better sealing effect and avoids the problem of large frictional resistance when using combined sealing and other sealing methods. Under the premise, it is beneficial to improve the response speed of the valve.

4. The on-off valve acts on the main valve core through the pressure difference formed before and after the damping hole to open the main valve port, which is beneficial to reduce the opening control force, and is especially suitable for occasions with high system pressure and large flow; at the same time, the main valve core It is made of 30% carbon fiber reinforced polyetheretherketone (PEEK) plastic, which has good corrosion resistance and self-lubricating property, so that the main valve core has better working performance.

Description of drawings

Fig. 1 is a schematic diagram of the mechanical structure of the water pressure switch control valve of the present invention.

Detailed ways

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the water pressure switch control valve of the present invention includes: main valve core 1, sealing ring 2, main valve spring 3, pilot valve body 4, pilot valve core 9, valve cover 10, main valve body 13. Lock nut 6, embossed handle 7 and spherical plug 14. The main valve is a flat valve structure, the pilot valve is a cone valve structure, the main valve core 1 is pressed on the valve seat hole of the main valve body 13 by the main valve spring 3, and the main valve core 1 and the main valve core 1 are realized by using the TX engineering plastic sealing ring 2. The sealing between the valve body holes, the pilot valve body 4 is installed on the main valve body 13 through threads, and the O-ring 12 is used to realize the static sealing between them, and the valve cover 10 is also screwed on the main valve body 13 through threads , the O-ring 5 is used to achieve sealing, the pilot valve spool 9 is screwed into the bonnet 10 through threads and then pressed on the pilot valve body 4, and the space between the pilot valve spool 9 and the bonnet 10 is sealed with an O-ring 11 , The lock nut 6 can fix the position of the pilot valve core 9, the embossed handle 7 is connected with the pilot valve core 9 through the pin 8, and the spherical plug 14 is used to close the process hole j of the blind hole n on the main valve body 13. The upper cavity b of the main valve is located between the main valve core 1 and the pilot valve body 4, the through hole a is a radial through hole on the main valve core 1, and the damping hole c is located on the axis of the main valve core 1, communicating with the through hole a and the main valve body. Valve upper cavity b, pilot valve cavity f are located between the pilot valve body 4 and the valve cover 10, the through hole d on the pilot valve body 4 communicates with the main valve upper cavity b and the pilot valve cavity f, and the blind hole e on the pilot valve body 4 Located on the axis of the pilot valve body, the blind hole m is located in the radial direction of the pilot valve body, connecting the blind hole e on the pilot valve body 4 and the concave annular groove h on the main valve body 13, the concave annular groove h can ensure that the pilot valve body 4 The blind hole m on the main valve body 13 communicates with the blind hole n on the main valve body 13. The blind hole n on the main valve body 13 is used to communicate with the outlet A of the valve. The blind hole g on the pilot valve body 4 also has a symmetrical blind hole for Used to rotate the pilot valve body during assembly or disassembly.

The switch control of the water pressure switch control valve of the present invention adopts a pilot structure. The main valve core 1, the pilot valve body 4 and the main valve body 13 constitute a pilot valve circuit, and the pilot valve core 9 controls the flow of the pilot valve circuit. broken. Its working principle is: when the on-off valve is connected to the hydraulic system, the water enters the inlet P and enters the upper cavity b of the main valve through the through hole a and the damping hole c on the main valve core 1, and then passes through the hole b on the pilot valve body 4. The through hole d enters the pilot valve chamber f, and the pilot valve is in the closed state at the beginning, and the water does not flow; turn the embossed handle 7 of the switch valve to lift the pilot valve open, and then the water passes through the blind hole e on the pilot valve body 4, m, the concave ring groove h on the main valve body 13 and the blind hole n flow to the outlet A of the valve, thus forming a pilot valve circuit, and the pressure difference between the upper and lower chambers of the main valve is formed due to the flow of water in the damping hole c , when the liquid force on the lower chamber of the main valve core is greater than the sum of the liquid force, spring force and friction resistance in the upper chamber, the main valve is opened and the on-off valve is connected. To close the on-off valve, turn the embossed handle 7 to close the pilot valve. At this time, the flow of water in the pilot valve is interrupted, and there is no pressure difference between the upper and lower chambers of the main valve. The main valve is closed under the action of the spring force, and the on-off valve is closed at this time.

The present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can adopt various other specific embodiments to implement the present invention according to the disclosed content of the present invention. Changes or modified designs all fall within the protection scope of the present invention.

Claims (6)

1. A water pressure switch control valve, comprising a main valve core (1), a main valve body (13) and a valve cover (10), is characterized in that it also includes a pilot valve spool (9) and a pilot valve body ( 4), the pilot valve body (4) is installed between the main valve core (1) and the bonnet (10), the pilot valve spool (9) passes through the bonnet (10) and presses on the pilot valve body (4), The main valve core (1), the pilot valve body (4) and the main valve body (13) form a pilot valve circuit, and the pilot valve spool (9) controls the on-off of the pilot valve circuit. 2. The water pressure switch control valve according to claim 1, characterized in that, the pilot valve circuit is a fluid channel circuit, and there is a damping hole in the circuit, and the damping hole is located on the main valve core (1), It communicates with the upper cavity and the lower cavity of the main valve core (1). 3. The water pressure switch control valve according to claim 1 or 2, characterized in that, between the main valve core (1) and the main valve body (13), between the pilot valve body (4) and the main valve core (1) between the pilot valve spool (9) and the bonnet (10), between the pilot valve body (4) and the main valve body (13), and between the bonnet (10) and the main valve body (13) Sealing, especially between the main valve core (1) and the main valve body (13) with a TX engineering plastic sealing ring for sealing. 4. The water pressure switch control valve according to claim 1 or 2, characterized in that the main valve core (1) is made of 30% carbon fiber reinforced polyether ether ketone, and is pressed against the main valve core by the main valve spring (3). On the seat hole of the valve body (13). 5. The water pressure switch control valve according to claim 1 or 2, characterized in that it also includes a handle (7), the handle (7) is connected with the pilot valve core (9), and the handle (7) can be rotated to enable Pilot spool (9) opens or closes. 6. The water pressure switch control valve according to claim 1 or 2, characterized in that, the pilot valve body (4) and the valve cover (10) are screwed on the main valve body (13) by threads, and the pilot valve core (9) is also screwed in the valve cover (10) by threads.

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