Pneumatic diaphragm regulating valve

Abstract

The utility model relates to the technical field of regulating valves, in particular to a pneumatic diaphragm regulating valve which comprises a valve body, an upper valve clack is connected in the valve body, one end of the upper valve clack is connected to a lower sealing cover, a pneumatic diaphragm is connected to the lower sealing cover, a valve rod is connected to the pneumatic diaphragm, a valve element is connected to the valve rod, and an upper sealing cover is connected to the lower sealing cover through a bolt. A connecting body is connected to the upper sealing cover, a pneumatic membrane chamber is formed in the connecting body, the pneumatic membrane chamber is located on the connecting body and connected with and communicated with a first air pump, a sliding block and a connecting plate are slidably connected into the connecting body, one end of the sliding block is connected with a connecting column, a graduated scale is arranged on the connecting column, and a visual window is formed in the connecting body of the connecting column. Air pressure in the pneumatic membrane chamber is controlled through the first air pump so as to balance the air pressure; the graduated scale is arranged on the connecting column and is matched with the visual window on the connecting body, so that the movement condition of the connecting column can be observed, and the flow can be adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of governing valve especially a pneumatic diaphragm governing valve. BACKGROUND

[0002] Pneumatic diaphragm governing valve is a device that controls fluid flow or pressure by using compressed air as a power source. The working principle of pneumatic diaphragm governing valve is relatively straightforward: when the signal from the controller changes, the pneumatic actuator will adjust the valve opening accordingly, so as to achieve the purpose of accurately controlling the flow of medium. This design not only improves efficiency, but also enhances the flexibility and response speed of the system. Compared with traditional manual or other types of electric governing valve, pneumatic diaphragm governing valve has higher precision, faster reaction time and better durability. Especially in the occasions that require frequent opening and closing or have high requirements on environmental conditions, such as chemical production, food processing and other industries, the application of pneumatic diaphragm governing valve is particularly widespread.

[0003] The valve rod of the pneumatic diaphragm governing valve in the prior art is not provided with a scale for reference, which cannot intuitively observe the situation in the valve when controlling air pressure. SUMMARY

[0004] The purpose of the present application is to provide a pneumatic diaphragm governing valve, which aims to solve the problems in the prior art.

[0005] The present application provides a pneumatic diaphragm governing valve, comprising a valve body, an upper valve flap and a lower valve flap are fixedly connected in the valve body, one end of the upper valve flap is fixedly connected to a lower cover, a pneumatic diaphragm is fixedly connected to the lower cover, a valve rod is fixedly connected to the pneumatic diaphragm, a valve core is fixedly connected to the valve rod, an upper cover is connected to the lower cover through bolts, a connecting body is fixedly connected to the upper cover, a pneumatic diaphragm chamber is formed in the connecting body, a first air pump is fixedly connected to the connecting body and communicates with the pneumatic diaphragm chamber, a sliding block and a connecting plate are slidingly connected in the connecting body, one end of the sliding block is fixedly connected to a connecting column, a scale is arranged on the connecting column, a viewing window is formed in the connecting body above the connecting column, the end of the connecting column away from the sliding block is fixedly connected to the connecting plate, an air cavity is formed below the connecting plate in the connecting body, a second air pump is fixedly connected to the connecting body and communicates with the air cavity; a limiting column is fixedly connected to the connecting plate, the limiting column is slidingly connected with a limiting groove, a spring is connected between the limiting column and the limiting groove, the limiting groove is fixedly connected to the upper cover, and the upper cover and the connecting body are connected through bolts.

[0006] Further, the upper valve flap and the lower valve flap are connected in a circular cross section, the valve core is in the shape of a combination of a cylinder and a circular truncated cone with the upper part larger and the lower part smaller, and the connection between the upper valve flap, the lower valve flap and the valve core in the shape of a circular truncated cone is a bevel matching the shape of the valve core.

[0007] Further, the upper cover and the lower cover are annular, the inner ring of the lower cover is in sliding connection with the valve rod, and the inner ring of the upper cover is in communication with the pneumatic diaphragm chamber.

[0008] Further, the pneumatic diaphragm is circular, and the circular edge of the pneumatic diaphragm is fixedly connected between the upper cover and the lower cover; the pneumatic diaphragm is an elastic diaphragm, and is deformed in the pneumatic diaphragm chamber.

[0009] Further, the limiting column is double-cylindrical, one part of the limiting column is in sliding connection with the inner groove wall of the limiting groove, and the slot opening of the limiting groove is provided with an annular step; the other part of the limiting column is in sliding connection with the annular step at the slot opening of the limiting groove.

[0010] The utility model discloses the beneficial effect is: the utility model discloses the air pressure in the pneumatic diaphragm chamber is controlled to balance the air pressure through the first air pump, is equipped with the visual window on the connecting body, and the scale is set up on the connecting column, and the activity of the connecting column can be observed, and the flow is adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the whole structure schematic diagram of the utility model.

[0012] Figure 2 It is the partial structure schematic diagram of the connecting body.

[0013] In the drawing:

[0014] 1-valve body;2-upper valve disc;3-lower valve disc;4-lower cover;5-pneumatic diaphragm;6-valve rod;7-valve core;8-upper cover;9-connecting body;10-pneumatic diaphragm chamber;11-first air pump;12-sliding block;13-connecting plate;14-connecting column;15-visual window;16-air cavity;17-second air pump;18-limiting column;19-limiting groove;20-spring;21-upper cover;22-inflow port;23-outflow port. DETAILED DESCRIPTION

[0015] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the protection scope of the utility model.

[0016] For example, Figure 1 And Figure 2The illustrated pneumatic diaphragm regulating valve comprises a valve body 1, an upper valve clack 2 and a lower valve clack 3 fixedly connected in the valve body 1, the upper valve clack 2 being fixedly connected at one end to a lower cover 4, the lower cover 4 being fixedly connected with a pneumatic diaphragm 5, the pneumatic diaphragm 5 being fixedly connected with a valve stem 6, the valve stem 6 being fixedly connected with a valve core 7, the lower cover 4 being connected with an upper cover 8 through bolts, the upper cover 8 being fixedly connected with a connecting body 9, the connecting body 9 being provided with a pneumatic diaphragm chamber 10, the pneumatic diaphragm chamber 10 being fixedly connected to and communicating with a first air pump 11 on the connecting body 9, the connecting body 9 being slidably connected with a sliding block 12 and a connecting plate 13, one end of the sliding block 12 being fixedly connected with a connecting column 14, the connecting column 14 being provided with a scale, the connecting column 14 being provided with a viewing window 15 on the connecting body 9, the end of the connecting column 14 away from the sliding block 12 being fixedly connected with the connecting plate 13, the connecting plate 13 being provided with an air cavity 16 below the connecting body 9, the air cavity 16 being fixedly connected to and communicating with a second air pump 17 on the connecting body 9; the connecting plate 13 being fixedly connected with a limiting column 18, the limiting column 18 being slidably connected with a limiting groove 19, the limiting column 18 and the limiting groove 19 being connected with a spring 20, the spring 20 being arranged to make the connecting plate 13 move slowly when the air in the air cavity 16 is supplied by the second air pump 17, so that the pneumatic diaphragm 5 moves slowly, thereby facilitating adjustment. The limiting groove 19 is fixedly connected to an upper cover 21, the upper cover 21 and the connecting body 9 being connected through bolts.

[0017] The upper valve clack 2 and the lower valve clack 3 are connected in a circular cross-section, the valve core 7 being a combination of a cylinder and a large upper and small lower circular truncated cone, the connection between the upper valve clack 2, the lower valve clack 3 and the valve core 7 being a bevel matching the shape of the valve core 7. The closed pipeline of the upper valve clack 2, the valve core 7 and the lower valve clack 3 is an inlet 22 near the upper valve clack 2, and an outlet 23 near the lower valve clack 3.

[0018] The upper cover 8 and the lower cover 4 are annular, the inner ring of the lower cover 4 being slidably connected with the valve stem 6, and the inner ring of the upper cover 8 being in communication with the pneumatic diaphragm chamber 10.

[0019] The pneumatic diaphragm 5 is circular, the circular edge being fixedly connected between the upper cover 8 and the lower cover 4, the pneumatic diaphragm 5 being an elastic diaphragm, and the deformation being in the pneumatic diaphragm chamber 10.

[0020] The limiting column 18 is double-cylindrical, and a part of the limiting column 18 is in sliding connection with the inner slot wall of the limiting slot 19, and the slot opening of the limiting slot 19 is provided with an annular step, and the other part of the limiting column 18 is in sliding connection with the slot opening of the limiting slot 19 and the annular step, which can prevent the limiting column 18 from being separated from the limiting slot 19, and can ensure that the connecting plate 13 can be moved upward when the second air pump 17 ventilates the air cavity 16.

[0021] After the regulating valve body is installed, water is injected into the inflow port 22, and the air in the pneumatic diaphragm chamber 10 is slowly extracted by the first air pump 11, and when water flows out of the outflow port 23, the first air pump 11 is slightly adjusted and stopped, so that the air pressure in the pneumatic diaphragm chamber 10 does not affect the deformation of the pneumatic diaphragm 5 when the second air pump 17 works.

[0022] When in use, the regulating valve body is installed in the pipeline, and the second air pump 17 injects gas into the air cavity 16, so that the air pressure in the air cavity 16 rises, the connecting plate 13 moves upward, thereby driving the sliding block 12 to move upward through the connecting column 14, and due to the action of the air pressure, the pneumatic diaphragm 5 deforms upward, the valve core 7 moves upward through the valve rod 6, and the fluid flows from the inflow port 22 to the outflow port 23, and by providing a scale on the connecting column 14 and cooperating with the visible window 15 on the connecting body 9, the movement of the connecting column 14 can be observed, thereby adjusting the flow.

[0023] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims.

Claims

1. A pneumatic diaphragm control valve characterized by, The valve body comprises a valve body, an upper valve disc and a lower valve disc are fixedly connected to the valve body, one end of the upper valve disc is fixedly connected to the lower cover, the lower cover is fixedly connected to a pneumatic diaphragm, the pneumatic diaphragm is fixedly connected to a valve stem, the valve stem is fixedly connected to a valve core, the lower cover is connected to the upper cover by bolts, the upper cover is fixedly connected to a connector, a pneumatic diaphragm chamber is provided in the connector, the pneumatic diaphragm chamber is fixedly connected to the connector and is connected to a first air pump, a slider and a connecting plate are slidably connected to the connector, and the slider One end is fixedly connected to a connecting column, and a scale is provided on the connecting column. The connecting column is provided with a visual window on the connecting body. The end of the connecting column away from the slider is fixedly connected to the connecting plate, and an air cavity is provided in the connecting body below the connecting plate. The air cavity is fixedly connected to the connecting body and is connected to a second air pump; a limiting column is fixedly connected to the connecting plate, and the limiting column is slidably connected to the limiting groove. A spring is connected between the limiting column and the limiting groove, and the limiting groove is fixedly connected to the upper closing cover. The upper closing cover and the connecting body are connected by bolts.

2. A pneumatic diaphragm control valve according to claim 1, wherein The cross section just above the connection between the upper and lower valve flaps is circular, the valve core is a combination of a cylinder and a truncated cone with a larger upper portion and a smaller lower portion, and the connection between the upper and lower valve flaps and the truncated cone of the valve core is an inclined surface that matches the shape of the valve core.

3. A pneumatic diaphragm control valve according to claim 1 wherein, The upper cover and the lower cover are annular, the inner ring of the lower cover is slidably connected to the valve stem, and the inner ring of the upper cover is communicated with the pneumatic membrane chamber.

4. A pneumatic diaphragm control valve as defined in claim 1 wherein, The pneumatic film is circular, and its circular edge is fixedly connected between the upper cover and the lower cover. The pneumatic film is an elastic film, and its deformation occurs in the pneumatic film chamber.

5. A pneumatic diaphragm control valve as defined in claim 1 wherein, The limiting column is in a double cylindrical shape, a part of the limiting column is slidably connected to the inner groove wall of the limiting groove, the groove opening of the limiting groove is provided with an annular step, and the other part of the limiting column is slidably connected to the annular step at the groove opening of the limiting groove.

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