External pilot control fluid valve

Abstract

The utility model discloses an external pilot control fluid valve, which is characterized in that a pilot cylinder is connected onto a valve body, a piston with a return spring and a piston rod fixedly connected with the piston are arranged in the pilot cylinder, a sealing valve core is fixed at the other end of the piston rod, and the sealing valve core is used for plugging or unplugging a medium flow channel in the valve body. An external air port is further formed in the pilot cylinder, a flow channel A and a flow channel B which are connected with pilot cavities in the two sides of the piston respectively are arranged in the external air port, and a plurality of communicating hole channels are drilled in the position, in the pilot cylinder, of the flow channel A to be connected into the external air port; according to the pilot fluid valve, the pilot cylinder of a piston type structure is arranged, the pilot cavity and the external air port of the pilot cylinder adopt inner drill holes for air passing, external assemblies are reduced, sealing pressure is reduced, noise elimination is achieved, when the designed pilot cylinder conducts valve closing control on the fluid valve, the piston rod is pushed by compressed air to drive the sealing valve element, and the sealing effect is improved. A medium flow channel can be quickly closed to stop fluid, backflow is prevented, and continuous sealing is provided in cooperation with an upper-inlet and lower-outlet structure.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an external pilot control fluid valve. Background Art

[0002] Fluid valves control the flow of fluid from one location to another. When in the closed position, they prevent high-pressure fluid on one side of the valve from flowing to a lower-pressure location on the other side. They typically consist of a movable fluid control member and some type of valve seat that cooperates with the fluid control member to control or stop fluid flow through the valve. While there are many different types of fluid valves, the general principle of physically separating higher-pressure fluid areas from lower-pressure fluid areas applies to all fluid valves. Fluid valves are widely used in various pipeline systems as pipeline opening and closing control components. There are many ways to design valve control. Among them, solenoid valves are very popular due to their compact structure and fast opening and closing. However, in some specific industries, it is not suitable to use electromagnetic methods to drive the valve body for opening and closing due to environmental factors. In addition, most fluid valves are equipped with one or more seals from the main structure to the control components and between the valve parts to prevent fluid leakage. This leads to the valve body structure of the existing technology being complicated, with a large number of mating parts inside, which is cumbersome to disassemble and assemble. The more components there are, the more likely it is to have sealing problems, and the worse the stability of the valve body. In addition, when disassembling and assembling complex valves, it is easy for staff to have difficulty in quickly installing their structures. Utility Model Content

[0003] In view of the existing technology, the purpose of this utility model is to provide a pilot control fluid valve with a cylinder-type pilot structure, which adopts external air supply to control the opening and closing of the medium flow channel of the valve body to realize the valve function. The control fluid valve has a scientific structural design, can quickly cut off the fluid when in use, prevent backflow, and has a simple and stable structure.

[0004] In order to achieve the above objectives, the technical solution adopted by the utility model is: an external pilot control fluid valve, including a valve body, a pilot cylinder is connected to the valve body, a piston with a return spring and a piston rod fixedly connected to the piston is provided in the pilot cylinder, a sealing valve core is fixed to the other end of the piston rod, and the sealing valve core is used to seal or unblock the medium flow channel in the valve body. An external air port is also provided on the pilot cylinder, and the external air port includes an A flow channel and a B flow channel respectively connected to the pilot chambers on both sides of the piston. The A flow channel is located in the pilot cylinder and a number of connecting holes are drilled to connect to the external air port.

[0005] As a further configuration of the above solution, the medium flow channel in the valve body includes an inlet, an outlet and a sealing seat, and the opening sealing surface of the sealing seat is arranged facing the movable direction of the sealing valve core.

[0006] As a further configuration of the above solution, a rolled pin is provided between the sealing valve core and the piston rod, and the rolled pin radially penetrates the two to fix them. An elastic sealing sleeve is also provided at the front end of the sealing valve core.

[0007] As a further configuration of the above solution, the piston rod is further penetrated by an upper partition and a lower partition, and both the upper partition and the lower partition are provided with sealing rings for sealing the joint opening side of the valve body and the pilot cylinder.

[0008] As a further arrangement of the above scheme, the valve body and the pilot cylinder are further provided with mounting grooves at the locations where they are arranged relative to the upper partition plate and the lower partition plate. The size of the mounting grooves matches the combined thickness of the upper partition plate and the lower partition plate. The valve body and the pilot cylinder are fixed by bolts to form a clamp for the upper partition plate and the lower partition plate.

[0009] Beneficial effect: The external pilot-controlled fluid valve of the utility model is controlled by setting a pilot cylinder structure similar to a cylinder, and the sealing valve core of the fluid valve is controlled by externally controlled air supply, so as to realize instantaneous control of the opening and closing of the fluid valve. Compared with the prior art, the fluid valve of this embodiment can quickly respond to provide a pilot-driven sealing valve core to cut off and disconnect the medium flow channel when working, so as to prevent the fluid from flowing back. The pilot cavity is provided with a connecting channel, and the air channel is connected by drilling air holes in the cylinder body, thereby avoiding the air noise caused by the setting of external pipelines. During assembly, it is only necessary to put a number of sealing structural parts and pistons that are pre-through the piston rod into the installation grooves between the valve body and the pilot cylinder shell, and then lock the valve body and the pilot cylinder with bolts to achieve installation. The structure is simple and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of the fluid valve of the present utility model.

[0011] Figure 2 This is a schematic diagram of the internal cross-section of the fluid valve of the present utility model.

[0012] Figure 3 Schematic diagram of the fluid valve communication channel structure of this embodiment.

[0013] Figure numerals: 1. Valve body; 2. Pilot cylinder; 20. Pilot chamber; 21. External air port; 26. B flow channel; 27. A flow channel; 271. Connecting channel; 29. ​​Bolt; 3. Medium flow channel; 31. Inlet; 32. Outlet; 33. Sealing seat; 4. Piston; 41. Return spring; 42. Piston rod; 51. Upper partition; 52. Lower partition; 53. Sealing ring; 55. Mounting slot; 6. Sealing valve core; 61. Coiled pin; 62. Elastic sealing sleeve. DETAILED DESCRIPTION

[0014] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0015] like Figure 1-3 The external pilot control fluid valve shown in the figure includes a valve body 1, the valve body 1 is connected to a pilot cylinder 2, the pilot cylinder 2 is provided with a piston 4 with a return spring 41 and a piston rod 42 fixedly connected to the piston 4, the other end of the piston rod 42 is fixed with a sealing valve core 6, the sealing valve core 6 is used to block or unblock the medium flow channel 3 in the valve body 1, the pilot cylinder 2 is also provided with an external air port 21, the external air port 21 includes an A flow channel 27 and a B flow channel 26 respectively connected to the pilot chamber 20 on both sides of the piston 4, the A flow channel 27 is located in the pilot cylinder 2 and drilled with a plurality of connecting holes 271 to connect to the external air port 21. In this embodiment, The pilot control fluid valve adopts a pilot cylinder 2 with a piston cylinder design to control the opening and closing of the medium flow channel 3 in the valve body 1, thereby realizing rapid opening and closing of the valve to meet the working conditions. The fluid valve has a relatively simple and stable structure, and is sensitive to pneumatic control, and can quickly cut off the medium. In addition, compared with the conventional air-driven valve structure, the pilot cylinder 2 of this embodiment adopts a plurality of internally drilled connecting holes 271 to form an air channel connected to the external air port 21, and the external air port 21 is correspondingly connected to the pilot cavity 20. This design reduces external components and avoids the noise emitted by air passing through the external pipeline, which can achieve quieter use.

[0016] As a further arrangement of the above scheme, the medium flow channel 3 in the valve body 1 includes an inlet 31, an outlet 32 ​​and a sealing seat 33. The opening sealing surface of the sealing seat 33 is arranged opposite to the movement direction of the sealing valve core 6. The fluid valve of this embodiment adopts a top-in and bottom-out method. After the external air supply is closed or accidentally closed, the reset spring 41 pushes the piston 4 and the piston rod 42 downward to block the opening of the sealing seat 33 with the sealing valve core 6. Based on the pressure of the medium, the sealing valve core 6 will continue to abut against the sealing seat 33, forming a certain continuous sealing force.

[0017] As a further configuration of the above solution, a rolled pin 61 is provided between the sealing valve core 6 and the piston rod 42 , and the rolled pin 61 radially penetrates the two to fix them. An elastic sealing sleeve 62 is also provided at the front end of the sealing valve core 6 .

[0018] As a further configuration of the above solution, the piston rod 42 is further penetrated by an upper partition 51 and a lower partition 52 , and a sealing ring 53 is provided on each of the upper partition 51 and the lower partition 52 for sealing the docking opening side of the valve body 1 and the pilot cylinder 2 .

[0019] As a further arrangement of the above scheme, the valve body 1 and the pilot cylinder 2 are further provided with mounting grooves 55 at the locations where they are arranged relative to the upper partition 51 and the lower partition 52. The size of the mounting grooves 55 matches the combined thickness of the upper partition 51 and the lower partition 52. The valve body 1 and the pilot cylinder 2 are fixed by bolts 29 to form a clamping mechanism for the upper partition 51 and the lower partition 52.

[0020] As mentioned above, the mounting groove 55 can realize the sealed isolation of the pilot chamber 20 and the inner cavity of the valve body 1 with the cooperation of the upper partition 51 and the lower partition 52. The sealing member arranged at the inner hole of the upper partition 51 and the lower partition 52 where the piston rod 42 passes through is made of elastic material, such as a silicone ring, which can maintain a certain elasticity and ensure the extension and retraction of the piston rod 42 under the sealed isolation between the pilot chamber 20 and the valve body 1.

[0021] The external pilot-controlled fluid valve of the utility model is controlled by setting a pilot cylinder structure similar to a cylinder, and the sealing valve core of the fluid valve is controlled by externally controlling the air supply, thereby realizing instantaneous control of the opening and closing of the fluid valve. Compared with the prior art, the fluid valve of this embodiment can quickly respond to provide a pilot-driven sealing valve core to cut off and disconnect the medium flow channel when working, thereby preventing the fluid from flowing back. The pilot cavity is provided with a connecting channel, and the air channel is connected by drilling air holes in the cylinder body, thereby avoiding the air noise caused by setting an external pipeline. During assembly, it is only necessary to put several sealing structural parts and pistons that are pre-through the piston rod into the installation grooves between the valve body and the pilot cylinder shell, and then lock the valve body and the pilot cylinder with bolts to achieve installation. The structure is simple and stable.

[0022] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. An external pilot control fluid valve, comprising a valve body (1), characterized in that: The valve body (1) is connected to a pilot cylinder (2), and a piston (4) with a return spring (41) and a piston rod (42) fixedly connected to the piston (4) are provided in the pilot cylinder (2). A sealing valve core (6) is fixed to the other end of the piston rod (42), and the sealing valve core (6) is used to block or unblock the medium flow channel (3) in the valve body (1). An external air port (21) is also provided on the pilot cylinder (2), and the external air port (21) includes an A flow channel (27) and a B flow channel (26) respectively connected to the pilot chambers (20) on both sides of the piston (4). The A flow channel (27) is located in the pilot cylinder (2) and has a plurality of connecting holes (271) drilled therein to connect to the external air port (21).

2. The external pilot control fluid valve according to claim 1, characterized in that: The medium flow channel (3) in the valve body (1) comprises an inlet (31), an outlet (32) and a sealing seat (33), and the opening sealing surface of the sealing seat (33) is arranged facing the movable direction of the sealing valve core (6).

3. The external pilot control fluid valve according to claim 1, characterized in that: A rolled pin (61) is provided between the sealing valve core (6) and the piston rod (42), and the rolled pin (61) radially penetrates the two and is fixed thereto. An elastic sealing sleeve (62) is also provided at the front end of the sealing valve core (6).

4. The external pilot control fluid valve according to claim 1, characterized in that: The piston rod (42) is further provided with an upper partition (51) and a lower partition (52), and both the upper partition (51) and the lower partition (52) are provided with sealing rings (53) for sealing the butt opening side of the valve body (1) and the pilot cylinder (2).

5. The external pilot control fluid valve according to claim 4, characterized in that: The valve body (1) and the pilot cylinder (2) are further provided with mounting notches (55) at locations where they are arranged relative to the upper partition (51) and the lower partition (52). The size of the mounting notches (55) matches the combined thickness of the upper partition (51) and the lower partition (52). The valve body (1) and the pilot cylinder (2) are fixed by bolts (29) to form a clamping mechanism for the upper partition (51) and the lower partition (52).

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