Pilot-operated type pneumatic control valve

Abstract

The utility model relates to a pilot-operated type pneumatic control valve which comprises a valve body, a top spring, a piston, a piston rod, an upper sealing sliding seat, a lower sealing sliding seat and an auxiliary spring are sequentially arranged in the valve body from top to bottom, the upper end and the lower end of the piston rod are connected with the piston and the upper sealing sliding seat, and the upper sealing sliding seat is connected with the lower sealing sliding seat through a reversing guide column. The upper sealing sliding seat slides in the upper sealing sliding seat cavity, the lower sealing sliding seat slides in the lower sealing sliding seat cavity, a pilot hole, an air inlet hole, an exhaust hole and a working hole are formed in the valve body, an inner port of the pilot hole faces the bottom of the piston, an inner port of the air inlet hole is located below the upper sealing sliding seat, and an inner port of the exhaust hole is located above the lower sealing sliding seat. And an inner port of the working hole is communicated with the upper sealing sliding seat cavity and the lower sealing sliding seat cavity. According to the two-position three-way normally-closed valve, the problem that the valve element outer pilot direct-acting structure and the valve element sealing form are changed is solved, the direct-acting sealing valve structure is adopted, control over multiple media of the two-position three-way normally-closed valve is achieved, the sealing performance is excellent, and the service life is long.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a pilot-operated gas-controlled valve. Background Art

[0002] In pneumatic systems, valves are widely used components in pneumatic circuits, and the most commonly used ones are three-position five-way solenoid valves, two-position five-way solenoid valves, etc. The existing technology mainly switches the valve core position by alternately energizing the coils at both ends of the solenoid valve, thereby achieving the replacement of the solenoid valve body and valve core position, so there is a problem of complex control structure. Summary of the invention

[0003] The utility model aims to provide a pilot-operated gas-controlled valve which can solve the above-mentioned problems and has excellent sealing performance and long service life.

[0004] According to the technical solution provided by the utility model: a pilot air-controlled valve includes a valve body, in which a top spring, a piston, a piston rod, an upper sealing slide, a lower sealing slide, and an auxiliary spring are arranged in sequence from top to bottom. The upper and lower ends of the piston rod are connected to the piston and the upper sealing slide, and the upper sealing slide is connected to the lower sealing slide through a reversing guide column. The upper sealing slide slides in the upper sealing slide cavity, and the lower sealing slide slides in the lower sealing slide cavity. A pilot hole, an air inlet hole, an exhaust hole, and a working hole are provided in the valve body. The port in the pilot hole faces the bottom of the piston, the port in the air inlet hole is located below the upper sealing slide, the port in the exhaust hole is located above the lower sealing slide, and the port in the working hole is connected to the upper sealing slide cavity and the lower sealing slide cavity.

[0005] As a further improvement of the utility model, the upper valve body, the intermediate body, the lower valve body and the lower valve cover constitute the valve body.

[0006] As a further improvement of the utility model, the pilot hole is opened in the intermediate body; the air inlet hole, the exhaust hole and the working hole are opened in the intermediate body.

[0007] As a further improvement of the present invention, the top spring abuts against the valve body and the top of the piston.

[0008] As a further improvement of the utility model, the auxiliary spring abuts against the valve body and the bottom of the lower sealing sliding seat.

[0009] As a further improvement of the utility model, an upper sealing gasket is installed at the bottom of the upper sealing sliding seat.

[0010] As a further improvement of the utility model, a lower sealing gasket is installed on the top of the lower sealing sliding seat.

[0011] As a further improvement of the utility model, a first sealing ring is sleeved on the outer periphery of the piston, a second sealing ring is provided between the piston and the piston rod, and a third sealing ring is sleeved on the outer periphery of the piston rod.

[0012] As a further improvement of the utility model, a fourth sealing ring is provided between the upper valve body and the intermediate body, a fifth sealing ring is provided between the intermediate body and the lower valve body, and a sixth sealing ring is provided between the lower valve body and the lower valve cover.

[0013] The positive effects of this application are:

[0014] The utility model has fast and stable switching of working states, excellent sealing performance and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the lower valve body of the utility model.

[0017] Figure 1-Figure 2 It includes an upper valve body 1, a top spring 2, a nut 3, a piston 4, a second sealing ring 6, a third sealing ring 7, a piston rod 8, a fourth sealing ring 9, an intermediate body 10, a fifth sealing ring 11, an upper sealing slide 12, a lower valve body 13, a reversing guide column 14, a sixth sealing ring 15, a lower sealing plug 16, a lower sealing slide 17, an auxiliary spring 18, a lower valve cover 19, a pilot hole 20, an air inlet hole 21, an exhaust hole 22, a working hole 23, etc. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] In order to enable those skilled in the art to better understand the solution of the utility model, the following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the utility model described herein. In addition, similar terms such as "including" and "having" mean that in addition to those contents already listed in "including" and "having", other contents that have not been listed can also be "included" and "having"; for example, a process, method, system, product or device that can include a series of steps or units is not necessarily limited to those steps or units that have been clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] Due to the angle of the drawing, some components may not be drawn, but their positions and connection relationships can be partially understood based on the text expression.

[0022] like Figure 1-Figure 2 As shown, the utility model is a pilot-operated gas-controlled valve, comprising a valve body, in which a top spring 2, a piston 4, a piston rod 8, an upper sealing slide 12, a lower sealing slide 17, and an auxiliary spring 18 are arranged in sequence from top to bottom. The upper and lower ends of the piston rod 8 are connected to the piston 4 and the upper sealing slide 12, and the upper sealing slide 12 is connected to the lower sealing slide 17 through a reversing guide column 14. The upper sealing slide 12 slides in the upper sealing slide cavity, and the lower sealing slide 17 slides in the lower sealing slide cavity. A pilot hole 20, an air inlet hole 21, an exhaust hole 22, and a working hole 23 are arranged in the valve body. The inner port of the pilot hole 20 faces the bottom of the piston 4, the inner port of the air inlet hole 21 is located below the upper sealing slide 12, the inner port of the exhaust hole 22 is located above the lower sealing slide 17, and the inner port of the working hole 23 is connected to the upper sealing slide cavity and the lower sealing slide cavity.

[0023] The upper valve body 1, the intermediate body 10, the lower valve body 13 and the lower valve cover 19 constitute a valve body.

[0024] The pilot hole 20 is formed in the intermediate body 10 . The air inlet hole 21 , the air outlet hole 22 , and the working hole 23 are formed in the intermediate body 10 .

[0025] The top spring 2 abuts against the valve body and the top of the piston 4 , and the auxiliary spring 18 abuts against the valve body and the bottom of the lower sealing slide 17 .

[0026] In order to enhance the sealing performance, an upper sealing gasket 16 - 1 is installed at the bottom of the upper sealing slide 12 , and a lower sealing gasket 16 - 2 is installed at the top of the lower sealing slide 17 .

[0027] A first sealing ring 5 is sleeved on the outer periphery of the piston 4, a second sealing ring 6 is provided between the piston 4 and the piston rod 8, a third sealing ring 7 is sleeved on the outer periphery of the piston rod 8, a fourth sealing ring 9 is provided between the upper valve body 1 and the intermediate body 10, a fifth sealing ring 11 is provided between the intermediate body 10 and the lower valve body 13, and a sixth sealing ring 15 is provided between the lower valve body 13 and the lower valve cover 19.

[0028] The working process of the utility model is as follows:

[0029] like Figure 1 As described, the upper valve body 1 has an exhaust port at the top. When there is no air pressure in the pilot hole 20, under the action of the top spring 2, the inner port of the air inlet hole 21 is compressed by the upper sealing gasket 16-1 and cannot be connected to the working hole 23. The working hole 23 is connected to the exhaust hole 22 to realize the exhaust function.

[0030] When there is air pressure in the pilot hole 20, the inner end of the pilot hole 20 blows toward the piston 4. The piston 4 overcomes the pressure of the top spring 2 and drives the upper sealing slide 12 to move upward through the piston rod 8, so that the air inlet 21 is connected to the working hole 23. At the same time, the lower sealing gasket 16-2 on the top of the lower sealing slide 17 blocks the inner port of the exhaust hole 22, thereby realizing the function of a two-position three-way air-controlled valve.

[0031] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A pilot-operated gas-controlled valve, comprising a valve body, characterized in that: The valve body is provided with a top spring (2), a piston (4), a piston rod (8), an upper sealing slide (12), a lower sealing slide (17), and an auxiliary spring (18) in sequence from top to bottom. The upper and lower ends of the piston rod (8) are connected to the piston (4) and the upper sealing slide (12). The upper sealing slide (12) is connected to the lower sealing slide (17) via a reversing guide column (14). The upper sealing slide (12) slides in the upper sealing slide cavity, and the lower sealing slide (17) slides in the lower sealing slide cavity. The valve body is provided with a pilot hole (20), an air inlet hole (21), an exhaust hole (22), and a working hole (23). The inner port of the pilot hole (20) faces the bottom of the piston (4), the inner port of the air inlet hole (21) is located below the upper sealing slide (12), the inner port of the exhaust hole (22) is located above the lower sealing slide (17), and the inner port of the working hole (23) is connected to the upper sealing slide cavity and the lower sealing slide cavity.

2. The pilot-operated gas-controlled valve according to claim 1, characterized in that: The upper valve body (1), the intermediate body (10), the lower valve body (13) and the lower valve cover (19) constitute a valve body.

3. The pilot-operated gas-controlled valve according to claim 2, characterized in that: The pilot hole (20) is formed in the intermediate body (10); the air inlet hole (21), the air outlet hole (22), and the working hole (23) are formed in the intermediate body (10).

4. The pilot-operated gas-controlled valve according to claim 1, characterized in that: The top spring (2) presses against the valve body and the top of the piston (4).

5. The pilot-operated gas-controlled valve according to claim 1, characterized in that: The auxiliary spring (18) presses against the valve body and the bottom of the lower sealing slide (17).

6. The pilot-operated gas-controlled valve according to claim 1, characterized in that: An upper sealing gasket (16-1) is installed at the bottom of the upper sealing slide (12).

7. The pilot-operated gas-controlled valve according to claim 1, characterized in that: The lower sealing gasket (16-2) is installed on the top of the lower sealing slide (17).

8. The pilot-operated gas-controlled valve according to claim 1, characterized in that: A first sealing ring (5) is sleeved on the outer circumference of the piston (4), a second sealing ring (6) is provided between the piston (4) and the piston rod (8), and a third sealing ring (7) is sleeved on the outer circumference of the piston rod (8).

9. The pilot-operated gas-controlled valve according to claim 2, characterized in that: A fourth sealing ring (9) is provided between the upper valve body (1) and the intermediate body (10), a fifth sealing ring (11) is provided between the intermediate body (10) and the lower valve body (13), and a sixth sealing ring (15) is provided between the lower valve body (13) and the lower valve cover (19).

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