Adjustable pneumatic stop valve

Abstract

An adjustable pneumatic stop valve comprises a valve body, a water inlet channel and a water outlet channel which are communicated with each other are arranged in the valve body, a valve rod penetrates into the valve body from the upper end of the valve body, and a valve clack is arranged at the lower end of the valve rod and corresponds to the communication position of the water inlet channel and the water outlet channel. The valve is characterized in that a first baffle and a second baffle are arranged at the top end of the valve rod, a first air channel is arranged on the side wall of the air cylinder above the first baffle, and a second air channel is arranged on the side wall of the air cylinder below the second baffle; the side wall of the air cylinder is further provided with a limiting slideway, a limiting rod capable of sliding along the limiting slideway is arranged in the limiting slideway, a rack is arranged on the side wall of the limiting rod, a gear groove corresponding to the rack is formed in the side wall of the air cylinder, a gear meshed with the rack is arranged in the gear groove, and the outer end of the gear is connected with a hand wheel.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an adjustable pneumatic stop valve. Background Art

[0002] Pneumatic valves are valves driven by compressed air, that is, the air source is used to drive the execution to realize the opening and closing of the valve. In the current market, in order to compete with their products, pneumatic valve manufacturers have made different innovations under the concept of unified design of pneumatic valves, resulting in a wide variety of pneumatic control valves, such as diaphragm type, piston type and gear rack type, thus forming their own corporate standards and products.

[0003] The existing patent CN202023020927.1 discloses an adjustable segmented control pneumatic stop valve. In its technical solution, a limit column and a limit plate are added to the technical assembly to cooperate to realize the valve adjustment function. However, in this technical solution, the limit column is installed inside the control assembly. When maintenance and cleaning are required, it is necessary to pre-intake air to push the limit plate to the bottom of the limit column before it can be disassembled, which makes disassembly cumbersome and wastes electricity. Therefore, a pneumatic stop valve that is easy to disassemble and has an adjustment function is a product urgently needed on the market. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides the following solutions:

[0005] An adjustable pneumatic stop valve includes a valve body, in which an inlet channel and an outlet channel that are interconnected are provided, a valve stem extends into the valve body from the upper end of the valve body, and a valve disc is provided at the lower end of the valve stem, and the valve disc corresponds to the connection point between the inlet channel and the outlet channel; a cylinder for controlling the lifting and lowering of the valve stem is provided at the top of the valve body, a first baffle and a second baffle are provided at the top of the valve stem, a first air channel is provided on the side wall of the cylinder above the first baffle, and a second air channel is provided on the side wall of the cylinder below the second baffle; a limiting slide is also provided on the side wall of the cylinder, a limiting rod that can slide along the limiting slide is provided in the limiting slide, a rack is provided on the side wall of the limiting rod, a gear groove is provided on the side wall of the cylinder corresponding to the rack, a gear meshing with the rack is provided in the gear groove, and the outer end of the gear is connected to a handwheel.

[0006] Furthermore, the cylinder includes a cylinder body, an upper cover and a lower cover, the upper end of the cylinder body is sealed by the upper cover, and the lower end of the cylinder body is sealed by the lower cover; the first air duct extends from the side wall of the upper cover to the bottom surface of the upper cover and is connected to the cylinder body, and the second air duct extends from the side wall of the lower cover to the top surface of the lower cover and is connected to the cylinder body.

[0007] Furthermore, a locking groove is provided on the outer extension of the handwheel, and a locking device is also provided on the side wall of the cylinder. The end of the locking device is provided corresponding to the locking groove, and the rear end of the locking device is rotatably connected to the side wall of the cylinder.

[0008] Furthermore, a sealing sheet is provided at the inner end of the limiting rod, and a sealing sleeve is provided between the outer wall of the limiting rod and the limiting slideway.

[0009] Furthermore, when the limiting rod moves outward to the maximum position, the inner end surface of the limiting rod and the inner wall of the cylinder are located in the same plane.

[0010] The beneficial effects of the utility model are:

[0011] The valve opening position is adjusted by moving the limit rod so that the limit rod is against the top surface or bottom surface of the first baffle or the second baffle. During maintenance, the limit rod can be easily removed, thereby reducing the steps of removing the valve stem. A sealing sleeve is provided on the outer periphery of the limit rod. During normal use, the limit rod will not be completely withdrawn, thereby ensuring the sealing effect of the limit slide groove. A sealing gasket is provided at the inner end of the limit rod to prevent the limit rod from moving inward and directly colliding with the valve stem, thereby causing damage to the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of the utility model;

[0013] Figure 2 Schematic diagram of the internal structure of the cylinder.

[0014] 1. Valve body; 2. Water inlet channel; 3. Water outlet channel; 4. Valve disc; 5. Valve stem; 6. Cylinder; 7. Cylinder body; 8. Upper cover; 9. Lower cover; 10. First air channel; 11. Second air channel; 12. First baffle; 13. Second baffle; 14. Limit rod; 15. Rack; 16. Handwheel; 17. Gear; 18. Locking device. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present application clearer, the present invention is further described in detail below in conjunction with the embodiments. In order to thoroughly understand the present invention, some specific details will be involved in the following description. In the absence of these specific details, the present invention can still be implemented, that is, those skilled in the art can more effectively introduce the essence of their work to other technicians in the field using these descriptions and statements here. In addition, it should be noted that it should be understood that the specific embodiments described herein are merely used to explain the present application and are not intended to limit the actual scope of protection. All raw materials used in the following examples are commercially available products.

[0016] Example 1: Figure 1-Figure 2As shown, an adjustable pneumatic stop valve includes a valve body 1, in which an inlet channel 2 and an outlet channel 3 connected to each other are provided, a valve stem 5 extends into the valve body 1 from the upper end of the valve body 1, and a valve disc 4 is provided at the lower end of the valve stem 5, and the valve disc 4 corresponds to the connection point between the inlet channel 2 and the outlet channel 3; a cylinder 6 for controlling the lifting of the valve stem 5 is provided at the top of the valve body 1, a first baffle 12 and a second baffle 13 are provided at the top of the valve stem 5, a first air channel 10 is provided on the side wall of the cylinder 6 above the first baffle 12, and a second air channel 11 is provided on the side wall of the cylinder 6 below the second baffle 13; a limiting slide is also provided on the side wall of the cylinder 6, a limiting rod 14 that can slide along the limiting slide is provided in the limiting slide, a rack 15 is provided on the side wall of the limiting rod 14, a gear groove is provided on the side wall of the cylinder 6 corresponding to the rack 15, a gear 17 meshing with the rack 15 is provided in the gear groove, and the outer end of the gear 17 is connected to the handwheel 16.

[0017] The cylinder 6 includes a cylinder body 7, an upper cover 8 and a lower cover 9. The upper end of the cylinder body 7 is sealed by the upper cover 8, and the lower end of the cylinder body 7 is sealed by the lower cover 9. The first air duct 10 extends from the side wall of the upper cover 8 to the bottom surface of the upper cover 8 and is connected to the cylinder body 7. The second air duct 11 extends from the side wall of the lower cover 9 to the top surface of the lower cover 9 and is connected to the cylinder body 7.

[0018] The hand wheel 16 is provided with a locking groove on its outer extension, and the side wall of the cylinder 6 is also provided with a locking device 18. The end of the locking device 18 is provided corresponding to the locking groove, and the rear end of the locking device 18 is rotatably connected to the side wall of the cylinder 6.

[0019] A sealing sheet is provided at the inner end of the limiting rod 14 , and a sealing sleeve is provided between the outer wall of the limiting rod 14 and the limiting slideway.

[0020] When the limiting rod 14 moves outward to the maximum position, the inner end surface of the limiting rod 14 and the inner wall of the cylinder 6 are located in the same plane.

[0021] When in use, first lift the locking device 18 to make the end of the locking device 18 leave the locking groove on the handwheel 16, and turn the handwheel 16 to drive the limit rod 14 to move outward until the inner end of the limit rod 14 is flush with the inner wall of the cylinder 6. At this time, air is fed from the first air channel 10 or the second air channel 11. If air is fed from the first air channel 10, the valve stem 5 moves downward, reducing the distance between the valve disc 4 and the connection between the water inlet channel 2 and the water outlet channel 3. When the valve disc 4 is closed, the first baffle 12 is located below the limit rod 14. Reverse the handwheel 16 to make the limit rod 14 enter the cylinder 6 until the inner end of the limit rod 6 is against the valve stem 5. At this time, the top surface of the first baffle 12 is against the limit rod 14, which is the valve closed position. If the valve needs to be opened, , air is taken in from the second air channel 11, and the valve stem 5 moves upward. When the gap between the first baffle 12 and the second baffle 13 corresponds to the limit rod 14, the hand wheel 16 is turned, and the limit rod 14 is embedded in the gap between the first baffle 12 and the second baffle 13. At this time, the valve is in the first-level open state; if the valve needs to continue to open, air is continued to be taken in from the second air channel 11, and the valve stem 5 continues to be lifted until the second baffle 13 reaches above the limit rod 14, and the hand wheel is turned, and the limit rod 14 moves inward, and the bottom end of the second baffle 13 is against the limit rod 14. At this time, the valve is in the maximum open state; if the valve is switched from the maximum open state to the first-level open state or the valve closed state, air is taken in from the first air channel 10 to move the valve stem 5 downward.

[0022] The utility model adjusts the valve opening position by moving the limit rod 14 so that the limit rod 14 is against the top surface or bottom surface of the first baffle 12 or the second baffle 13. When performing maintenance, the limit rod 14 is convenient to be taken out, thereby reducing the steps of taking out the valve stem 5. A sealing sleeve is arranged on the outer surface of the limit rod 14. During normal use, the limit rod 14 will not be completely withdrawn, thereby ensuring the sealing effect of the limit slide groove. A sealing gasket is arranged on the inner end of the limit rod 14 to prevent the limit rod 14 from moving inward and directly colliding with the valve stem 5, thereby causing damage to the valve stem 5.

[0023] Finally, it should be noted that the above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples and is subject to numerous variations. All variations that can be directly derived or conceived by a person of ordinary skill in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. An adjustable pneumatic stop valve comprising a valve body, wherein the valve body is provided with an interconnected water inlet channel and a water outlet channel, a valve stem extending from the upper end of the valve body into the valve body, a valve disc provided at the lower end of the valve stem, the valve disc corresponding to the connection between the water inlet channel and the water outlet channel; a cylinder is provided at the top of the valve body to control the raising and lowering of the valve stem, and the valve stem is characterized by: A first baffle and a second baffle are provided at the top of the valve stem, a first air channel is provided on the side wall of the cylinder above the first baffle, and a second air channel is provided on the side wall of the cylinder below the second baffle; a limiting slide is also provided on the side wall of the cylinder, a limiting rod that can slide along the limiting slide is provided in the limiting slide, a rack is provided on the side wall of the limiting rod, a gear groove is provided on the side wall of the cylinder corresponding to the rack, a gear meshing with the rack is provided in the gear groove, and the outer end of the gear is connected to a handwheel.

2. An adjustable pneumatic stop valve as claimed in claim 1, characterized in that: The cylinder includes a cylinder body, an upper cover and a lower cover. The upper end of the cylinder body is sealed by the upper cover, and the lower end of the cylinder body is sealed by the lower cover. The first air duct extends from the side wall of the upper cover to the bottom surface of the upper cover and is connected to the cylinder body. The second air duct extends from the side wall of the lower cover to the top surface of the lower cover and is connected to the cylinder body.

3. An adjustable pneumatic stop valve as claimed in claim 1, characterized in that: A locking groove is provided on the outer extension of the hand wheel, and a locking device is also provided on the side wall of the cylinder. The end of the locking device is arranged corresponding to the locking groove, and the rear end of the locking device is rotatably connected to the side wall of the cylinder.

4. An adjustable pneumatic stop valve as claimed in claim 1, characterized in that: A sealing sheet is provided at the inner end of the limiting rod, and a sealing sleeve is provided between the outer wall of the limiting rod and the limiting slideway.

5. An adjustable pneumatic stop valve as claimed in claim 1, characterized in that: When the limiting rod moves outward to the maximum position, the inner end surface of the limiting rod and the inner wall of the cylinder are located in the same plane.

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