Pneumatic control valve convenient to clean and maintain

Abstract

The utility model discloses a pneumatic control valve convenient to clean and maintain, and relates to the technical field of pneumatic control valves, the pneumatic control valve comprises a pneumatic diaphragm actuator, a support and a control valve body, a diaphragm is arranged in the pneumatic diaphragm actuator in a sealing and sliding manner, the bottom end of the diaphragm is fixedly connected with a valve rod, the valve rod penetrates through the support, and the valve rod and the support are in sliding fit; the bottom end of the valve rod slidably extends into the regulating valve body; the valve rod is fixedly connected with a valve core in the regulating valve body; the pneumatic diaphragm actuator is divided into an upper diaphragm cover and a lower diaphragm cover. The fixing of the limiting rod to the first sealing ring is relieved by pulling the rotating cover, and the second spring pushes the supporting ring to separate the upper film cover from the lower film cover, so that internal components are convenient to clean; during installation, the limiting rod is matched with the inclined face of the first sealing ring for rapid positioning, and sealing performance is ensured. According to the design, quick disassembly and assembly of the pneumatic diaphragm actuator are achieved, and the maintenance efficiency is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic control valve technical field, especially pneumatic control valve of convenient maintenance of cleaning. BACKGROUND

[0002] Pneumatic control valve is with compressed gas as power source, with cylinder as actuator, and with the help of valve positioner, converter, solenoid valve, position valve, gas tank, gas filter and other accessories to drive valve, realize on-off or proportional control, receive industrial automation control system control signal to complete the adjustment of pipeline medium: flow, pressure, temperature, level and other process parameters, the characteristic of pneumatic control valve is simple control, fast response, and intrinsic safety, no additional explosion-proof measures are needed.

[0003] In the prior art, the diaphragm of the pneumatic control valve is prone to breakage and air leakage after long-term use due to frequent mechanical movement and medium corrosion, which causes the piston to fail to work normally, thereby affecting the performance of the entire pneumatic actuator. In addition, when the diaphragm needs to be cleaned and maintained, since the pneumatic actuator is usually directly exposed to the external environment, the metal parts such as screw rods are easily eroded by rainwater, moisture or corrosive medium, causing the screw to rust, jam and be difficult to disassemble, which brings great inconvenience to maintenance work. This not only increases the difficulty and time cost of maintenance, but also may further exacerbate equipment damage due to untimely maintenance, affecting production efficiency and equipment life. Therefore, there is an urgent need for a pneumatic control valve with corrosion-resistant and easy-to-disassemble design to solve the problem of diaphragm damage and maintenance difficulty in the prior art, thereby meeting the needs of users for efficient operation and convenient maintenance of equipment.

[0004] To solve the above problems, the utility model provides a pneumatic control valve convenient to clean and maintain. Utility model content

[0005] To solve the problems in the background art, the utility model provides a pneumatic control valve convenient to clean and maintain.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a pneumatic control valve convenient to clean and maintain, comprising a pneumatic diaphragm actuator, a bracket and a control valve body, a diaphragm is arranged in the pneumatic diaphragm actuator in a sealed sliding manner, a valve rod is fixedly connected to the bottom end of the diaphragm, the valve rod passes through the bracket and forms a sliding fit with the bracket; the bottom end of the valve rod extends into the interior of the control valve body; the valve rod is fixedly connected with a valve core in the interior of the control valve body; the pneumatic diaphragm actuator is divided into an upper diaphragm cover and a lower diaphragm cover, a first sealing ring is fixedly connected to the bottom end of the upper diaphragm cover, a first annular sealing groove is formed in the upper end face of the lower diaphragm cover, the first sealing ring is limitingly connected in the interior of the first annular sealing groove, and the first sealing ring is sealingly connected with the first annular sealing groove.

[0007] The utility model further sets up, the side wall of lower membrane cover is around lower membrane cover's axis even sliding set with limit rod, limit rod and lower membrane cover sealed sliding connection, limit rod extends to the one end of first annular seal groove inside is inclined plane setting, the outer wall of first sealing ring is equipped with limit slot, limit rod and limit slot insert joint, limit rod is away from the one end of first sealing ring and is fixed with first spring, first spring is set on the outside of limit rod, the other end of first spring and lower membrane cover fixed connection.

[0008] The utility model further sets up, the outer wall top end fixed mounting of lower membrane cover has first connecting ring, limit rod is away from the one end of first sealing ring and is rotatably installed with rotating cover, the fixed joint of limit board is equipped on rotating cover, the lower end surface of first connecting ring is equipped with rectangular slot on the position of limit board, limit board and rectangular slot clamping cooperation.

[0009] The utility model further sets up, the outer wall of upper membrane cover is fixedly installed with second connecting ring, the lower end surface of second connecting ring is fixedly connected with second sealing ring, the upper end surface of first connecting ring is equipped with second annular seal groove, second sealing ring and second annular seal groove insert joint.

[0010] The utility model further sets up, the inside of first annular seal groove is slidably provided with a support ring, a plurality of second springs are uniformly fixed to the bottom end of the support ring about the axis of the support ring, and the other end of the second spring is fixedly connected with the inner bottom surface of the first annular seal groove.

[0011] The utility model further sets up, the inner bottom surface of lower membrane cover is fixedly installed with third spring, and the top end of the third spring is fixedly connected with the lower end surface of the diaphragm.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] The pneumatic control valve is convenient to clean and maintain, the limit rod is separated from the limit slot by pulling the rotating cover, the rotating cover is rotated by the elasticity of the first spring, the limit plate is slid into the rectangular slot, and the first sealing ring is released from the limit; then, the second spring pushes the support ring and the first sealing ring upwards, the upper membrane cover is separated from the lower membrane cover, and the internal diaphragm and the third spring are convenient to clean. During installation, the limit rod and the inclined surface of the first sealing ring are matched to realize quick positioning and fixing, and ensure the sealing property. The cooperation of the first sealing ring, the first annular seal groove, the second sealing ring and the second annular seal groove ensures the sealing property, realizes quick disassembly and assembly of the pneumatic diaphragm actuator, and significantly improves the maintenance efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model is further illustrated as follows by combining with the drawings and examples:

[0015] Figure 1It is the whole structure schematic view of the utility model;

[0016] Figure 2 It is the local structure schematic view of the utility model;

[0017] Figure 3 It is the local sectional structure schematic view of the utility model;

[0018] Figure 4 It is the utility model Figure 3 The enlarged schematic view of A in the middle.

[0019] The sign: 1, pneumatic diaphragm actuator;2, support;3, regulating valve body;4, diaphragm;5, valve stem;6, upper diaphragm cover;7, lower diaphragm cover;8, first sealing ring;9, first annular sealing groove;10, limiting rod;11, limiting groove;12, first spring;13, first connecting ring;14, rotating cover;15, limiting plate;16, rectangular groove;17, second connecting ring;18, second sealing ring;19, second annular sealing groove;20, support ring;21, second spring;22, third spring. Specific implementation

[0020] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0022] In the utility model, unless otherwise stated, the orientation such as "up, down" used is generally for the direction shown in the drawings, or for the vertical, perpendicular or gravity direction. Similarly, for the convenience of understanding and description, "left, right" is generally for the left and right shown in the drawings, and "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the utility model.

[0023] Please refer to Figures 1-4 The utility model provides a kind of technical scheme: a pneumatic regulating valve of convenient cleaning maintenance, including pneumatic diaphragm actuator 1, support 2 and regulating valve body 3, diaphragm 4 is slidably arranged in the inside of pneumatic diaphragm actuator 1, the bottom end of diaphragm 4 is fixedly connected with valve stem 5, and valve stem 5 passes through support 2 and both form sliding fit;The bottom end of valve stem 5 is slidably extended to the inside of regulating valve body 3;Valve stem 5 is fixedly connected with valve core in the inside of regulating valve body 3.

[0024] The pneumatic diaphragm actuator 1 is divided into an upper diaphragm cover 6 and a lower diaphragm cover 7, and a third spring 22 is fixedly installed on the inner bottom surface of the lower diaphragm cover 7, and the top end of the third spring 22 is fixedly connected with the lower end surface of the diaphragm 4.

[0025] The bottom end of the upper diaphragm cover 6 is fixedly connected with a first sealing ring 8, and the upper end surface of the lower diaphragm cover 7 is provided with a first annular sealing groove 9, and the first sealing ring 8 is limitingly connected in the first annular sealing groove 9, and the first sealing ring 8 is sealingly connected with the first annular sealing groove 9.

[0026] A limiting rod 10 is slidingly arranged on the side wall of the lower diaphragm cover 7 around the axis of the lower diaphragm cover 7, and the limiting rod 10 is sealingly and slidingly connected with the lower diaphragm cover 7; one end of the limiting rod 10 extending into the first annular sealing groove 9 is provided with an inclined surface, a limiting groove 11 is formed in the outer wall of the first sealing ring 8, and the limiting rod 10 is insertedly connected with the limiting groove 11. It should be noted that the limiting rod 10 and the limiting groove 11 are provided with three groups, and are uniformly distributed around the axis of the pneumatic diaphragm actuator 1.

[0027] The end, away from the first sealing ring 8, of the limiting rod 10 is fixedly connected with a first spring 12, the first spring 12 is sleeved on the outside of the limiting rod 10, and the other end of the first spring 12 is fixedly connected with the lower diaphragm cover 7.

[0028] The outer wall of the lower diaphragm cover 7 is fixedly installed with a first connecting ring 13, and the end, away from the first sealing ring 8, of the limiting rod 10 is rotatably installed with a rotating cover 14, the rotating cover 14 is fixedly connected with a limiting plate 15, a rectangular groove 16 is formed in the lower end surface of the first connecting ring 13 corresponding to the position of the limiting plate 15, and the limiting plate 15 is clampedly connected with the rectangular groove 16.

[0029] The outer wall of the upper diaphragm cover 6 is fixedly installed with a second connecting ring 17, the lower end surface of the second connecting ring 17 is fixedly connected with a second sealing ring 18, the upper end surface of the first connecting ring 13 is provided with a second annular sealing groove 19, and the second sealing ring 18 is insertedly connected with the second annular sealing groove 19.

[0030] In the embodiment of the utility model, a supporting ring 20 is slidingly arranged in the first annular sealing groove 9, a plurality of second springs 21 are uniformly fixedly connected with the bottom end of the supporting ring 20 around the axis of the supporting ring 20, and the other end of the second spring 21 is fixedly connected with the inner bottom surface of the first annular sealing groove 9. The height of the supporting ring 20 is lower than the bottom end of the limiting rod 10.

[0031] Working principle:

[0032] When it is necessary to clean and maintain the inside of the pneumatic diaphragm actuator 1, the rotating cover 14 is pulled to make the limiting rods 10 disengage from the inside of the limiting grooves 11, and the first springs 12 are elongated. The rotating cover 14 is rotated to make the limiting plates 15 slide into the rectangular grooves 16, and the limiting rods 10 are kept disengaged from the limiting grooves 11. The three limiting rods 10 are pulled out of the corresponding limiting grooves 11 in sequence, and the limiting of the first sealing rings 8 is released. At this time, the second springs 21 are restored from the compressed state to move the supporting rings 20 upward, and the first sealing rings 8 are pushed upward to disengage from the inside of the first annular sealing grooves 9, so that the upper diaphragm cover 6 and the lower diaphragm cover 7 can be separated, and the diaphragm 4 and the third spring 22 inside the pneumatic diaphragm actuator 1 can be cleaned and maintained.

[0033] When it is necessary to install the upper diaphragm cover 6 and the lower diaphragm cover 7, the limiting plates 15 are turned out of the rectangular grooves 16, so that the first springs 12 are restored to make the limiting rods 10 enter the inside of the first annular sealing grooves 9. Then, the first sealing rings 8 at the bottom end of the upper diaphragm cover 6 are inserted into the first annular sealing grooves 9, and the bottom end of the first sealing rings 8 is slidably connected with the inclined surface of the limiting rods 10 to push the limiting rods 10 away from the first sealing rings 8, so that the first springs 12 are elongated. When the limiting grooves 11 on the first sealing rings 8 correspond to the limiting rods 10, the first springs 12 are restored to make the limiting rods 10 enter the inside of the limiting grooves 11, thereby limiting the first sealing rings 8. The assembly of the upper diaphragm cover 6 and the lower diaphragm cover 7 is completed.

[0034] The first sealing rings 8, the first annular sealing grooves 9, the second sealing rings 18 and the second annular sealing grooves 19 are arranged to ensure the sealing property of the connection between the upper diaphragm cover 6 and the lower diaphragm cover 7.

[0035] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. A pneumatic control valve with easy maintenance, comprising a pneumatic diaphragm actuator (1), a bracket (2) and a control valve body (3), characterized in that: The internal sealing sliding of the pneumatic diaphragm actuator (1) is provided with a diaphragm (4), the bottom end of the diaphragm (4) is fixedly connected with a valve rod (5), the valve rod (5) passes through the support (2) and both form a sliding fit; the bottom end of the valve rod (5) is slidingly extended to the inside of the regulating valve body (3); the valve rod (5) is fixedly connected with the valve core inside the regulating valve body (3); the pneumatic diaphragm actuator (1) is divided into an upper diaphragm cover (6) and a lower diaphragm cover (7), the bottom end of the upper diaphragm cover (6) is fixedly connected with a first sealing ring (8), the upper end face of the lower diaphragm cover (7) is provided with a first annular sealing groove (9), the first sealing ring (8) is limitingly connected in the first annular sealing groove (9), and the first sealing ring (8) is sealingly connected with the first annular sealing groove (9).

2. A pneumatic control valve for easy maintenance according to claim 1, characterized in that: The side wall of the lower diaphragm cover (7) is uniformly provided with a limiting rod (10) sliding around the axis of the lower diaphragm cover (7), the limiting rod (10) is sealingly and slidingly connected with the lower diaphragm cover (7); one end of the limiting rod (10) extending to the inside of the first annular sealing groove (9) is provided with an inclined surface, a limiting groove (11) is formed in the outer wall of the first sealing ring (8), and the limiting rod (10) is inserted and matched with the limiting groove (11); one end of the limiting rod (10) away from the first sealing ring (8) is fixedly connected with a first spring (12), the first spring (12) is sleeved on the outside of the limiting rod (10), and the other end of the first spring (12) is fixedly connected with the lower diaphragm cover (7).

3. A pneumatic control valve for easy maintenance according to claim 1, characterized in that: The outer wall top end of the lower diaphragm cover (7) is fixedly installed with a first connecting ring (13), one end of the limiting rod (10) away from the first sealing ring (8) is rotatably installed with a rotating cover (14), the rotating cover (14) is fixedly connected with a limiting plate (15), a rectangular groove (16) is formed in the lower end face of the first connecting ring (13) corresponding to the position of the limiting plate (15), and the limiting plate (15) is clamped and matched with the rectangular groove (16).

4. A pneumatic control valve for easy maintenance according to claim 1, characterized in that: The outer wall of the upper diaphragm cover (6) is fixedly installed with a second connecting ring (17), the lower end face of the second connecting ring (17) is fixedly connected with a second sealing ring (18), a second annular sealing groove (19) is formed in the upper end face of the first connecting ring (13), and the second sealing ring (18) is inserted and matched with the second annular sealing groove (19).

5. A pneumatic control valve for easy maintenance according to claim 1, characterized in that: The inside of the first annular sealing groove (9) is slidingly provided with a supporting ring (20), a plurality of second springs (21) are uniformly fixedly connected with the bottom end of the supporting ring (20) around the axis of the supporting ring (20), and the other end of the second spring (21) is fixedly connected with the inner bottom face of the first annular sealing groove (9).

6. A pneumatic control valve for easy maintenance according to claim 1, characterized in that: The inside bottom face of the lower diaphragm cover (7) is fixedly installed with a third spring (22), and the top end of the third spring (22) is fixedly connected with the lower end face of the diaphragm (4).

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