High-sealing-performance corrosion-resistant pneumatic diaphragm valve

Abstract

The invention relates to the technical field of pneumatic diaphragm valves, and provides a high-sealing-performance corrosion-resistant pneumatic diaphragm valve which comprises a valve body, a valve deck, a mounting cylinder, an opening and closing mechanism and a switching mechanism, a feeding port is formed in one end of the valve body, a discharging port is formed in the other end of the valve body, a through hole is formed in the side, close to the valve deck, of the valve body, a partition flange is arranged in the valve body, and the mounting cylinder is arranged on the valve deck; the opening and closing mechanism is arranged in the valve body and the mounting cylinder; the switching mechanism is arranged on the mounting cylinder; according to the diaphragm valve, the valve rod, the connecting rod, the hand wheel, the valve clack and the diaphragm are matched, a manual and pneumatic combined mode is adopted, opening and closing control over the diaphragm valve is achieved under the condition that a pneumatic driving mechanism cannot work under special conditions, the flow channels in the valve body are symmetrically arranged in a splayed shape, and due to the ridge-shaped structure of the partition flange, the flow channels are not prone to falling off. No accumulation and no dead angle exist in the valve body, the phenomenon of medium blockage or caking is not prone to occurring, and a certain self-cleaning effect is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of pneumatic diaphragm valves, and in particular to a highly sealing and corrosion-resistant pneumatic diaphragm valve. Background Art

[0002] Pneumatic diaphragm valve is a special form of shut-off valve. Its opening and closing parts are a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving components, so it is called a pneumatic diaphragm valve. The most prominent feature of the pneumatic diaphragm valve is that the diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper valve cover, so that the valve stem, valve disc and other parts located above the diaphragm are not corroded by the medium, eliminating the packing sealing structure and preventing the medium from leaking out.

[0003] Referring to the Chinese patent application with publication number CN112212030A, a pneumatic diaphragm valve is disclosed, wherein the outer wall of a water valve chamber is fixedly connected to two water pipes, and the connection between the two water pipes and the water valve chamber is fixedly connected to two water tanks, and three valves are provided on the side walls of the water tanks and on the opposite sides of the water pipes, and a pressure plate is provided to set a pressure block, and three slidable I-shaped pressure blocks are fixedly installed inside the pressure plate to press the I-shaped pressure blocks. The vertical side walls of the conical pressure blocks can squeeze the I-shaped pressure blocks by rising and falling, and the lifting height of the conical pressure blocks can be changed to control the number of squeezed I-shaped pressure blocks, so as to achieve the effect of controlling the water flow by switching the number of valves;

[0004] However, there are the following problems in the prior art:

[0005] 1. When the existing technology cuts off the flow of corrosive media, a large contact area between the diaphragm and the valve seat is usually used to achieve a better sealing effect. However, the medium particles may accumulate on the contact surface between the diaphragm and the valve seat for a long time. In addition, since the contact area between the diaphragm and the valve seat is large, when the diaphragm blocks the valve seat, the diaphragm is easy to expand and enter the flow channel. When the diaphragm rises again with the valve stem, it will rub against the valve seat, thereby accelerating the wear of the diaphragm.

[0006] 2. In the prior art, only the valve flap and the diaphragm are controlled pneumatically to open and close the valve body, which cannot be used in an emergency.

[0007] For this purpose, we have designed a highly sealing and corrosion-resistant pneumatic diaphragm valve.

[0008] Contents of this application

[0009] A highly sealing and corrosion-resistant pneumatic diaphragm valve provided in an embodiment of the present application can realize the opening and closing control of the valve body by pneumatic and manual switching, while reducing the wear of the diaphragm and facilitating the technical problem of diaphragm replacement.

[0010] The embodiment of the present application provides a highly sealing and corrosion-resistant pneumatic diaphragm valve, comprising: a valve body, a valve cover, a mounting cylinder, an opening and closing mechanism and a switching mechanism, wherein one end of the valve body is provided with a feed port, and the other end is provided with a discharge port, a through hole is opened on a side of the valve body close to the valve cover, a partition flange is provided in the valve body, the mounting cylinder is arranged on the valve cover, the opening and closing mechanism is arranged in the valve body and the mounting cylinder, the opening and closing mechanism is used to cooperate with the partition flange to realize the opening and closing control of the valve body, the switching mechanism is arranged on the mounting cylinder, and the switching mechanism is used to realize the switching manual control when the opening and closing mechanism cannot control the opening and closing of the valve body;

[0011] By connecting the feed port and the discharge port at both ends of the valve body to the pipeline respectively, and delivering and sucking air into the first vent and the second vent respectively through an external air compression system, when air is delivered into the upper sealing chamber, the compressed air causes the movable disk to move downward, thereby driving the valve stem and the valve disc rotatably connected to the valve stem to move downward, and the valve disc pushes the diaphragm downward to fit tightly against the partition flange, thereby closing the valve body, and vice versa, opening the valve body.

[0012] The above technical solutions in the embodiments of the present application have at least the following technical effects:

[0013] 1. This application uses a combination of manual and pneumatic methods through the coordination of the valve stem, connecting rod, hand wheel, valve disc and diaphragm to achieve the opening and closing control of the diaphragm valve when the pneumatic drive mechanism cannot work under special circumstances, and is suitable for aseptic and pollution-free production.

[0014] 2. The present application uses an external air compression system to deliver and draw air into the first vent and the second vent, respectively, so that the flow characteristics of the diaphragm valve are close to the quick-opening characteristics, which is suitable for the needs of automatic control, program control or flow regulation.

[0015] 3. In the present application, the flow channel in the valve body is symmetrically arranged in an "eight" shape, and the partition flange in the middle is in contact with the diaphragm. The inside of the valve body is smooth, and due to the ridge-like structure of the partition flange, there is no accumulation or dead angle in the valve body, and it is not easy for the medium to be blocked or agglomerated. It has a certain self-cleaning effect. The inner wall of the valve body is provided with a corrosion-resistant lining, and the up and down movement of the diaphragm is used for regulation, which is suitable for the regulation of strong corrosive media such as strong acids and strong alkalis.

[0016] In this embodiment, a plurality of bolt mounting holes are correspondingly opened on the valve body and the valve cover, and eye bolts are arranged in the plurality of bolt mounting holes.

[0017] In this embodiment, a first vent hole and a second vent hole are respectively provided on the installation tube, the first vent hole and the second vent hole are connected to an external air compression system, and a group of limit rings are provided in the installation tube.

[0018] In this embodiment, mounting holes are provided on the mounting cylinder and the valve cover, and sealing rings are provided on the outer sides of the mounting holes.

[0019] In this embodiment, the opening and closing mechanism includes:

[0020] A movable disk, a valve stem, a valve disc, a diaphragm and a volute spring, wherein the movable disk is arranged in a set of limiting rings, the outer side wall of the movable disk is in close contact with the inner wall of the mounting cylinder, the movable disk divides the interior of the mounting cylinder into an upper sealing cavity and a lower sealing cavity, and a set of limiting rings is arranged between the first vent hole and the second vent hole;

[0021] The movable disk is coaxially fixedly connected with the valve stem, the valve stem is coaxially arranged in the mounting hole, and the valve stem is arranged in the valve body, the valve cover and the mounting cylinder, one end of the valve stem close to the valve body is coaxially rotatably connected with the valve disc, the diaphragm is arranged between the valve cover and the valve body, the diaphragm is fixedly connected with the valve disc, the vortex spring is coaxially sleeved on the outside of the valve stem, one end of the vortex spring is fixedly connected with the valve cover, and the other end is fixedly connected with the valve disc;

[0022] By adopting the above technical scheme, the first air vent and the second air vent are connected respectively through an external air compression system, and when the diaphragm valve is opened and closed, the air is delivered and sucked into the first air vent and the second air vent respectively through the external air compression system. Here, when air is delivered into the upper sealing cavity, the compressed air causes the movable disk to move downward, thereby driving the valve stem and the valve disc rotatably connected to the valve stem to move downward, and the valve disc pushes the diaphragm downward to fit tightly against the partition flange. The external air compression system cooperates with the first air vent and the second air vent respectively, so that the flow characteristics of the diaphragm valve are close to the quick-opening characteristics, which is suitable for the needs of automatic control, program control or flow regulation.

[0023] In this embodiment, the switching mechanism includes:

[0024] A connecting rod, a plurality of abutment fixing sheets, a tightening cover and a handwheel, wherein the connecting rod is coaxially arranged in the valve stem, and the connecting rod and the valve stem are connected by a thread, one end of the connecting rod is coaxially fixedly connected to the handwheel, and the other end is coaxially fixedly connected to the valve disc, a plurality of the abutment fixing sheets are evenly fixedly arranged on the mounting cylinder, and a plurality of the abutment fixing sheets are arranged around the outer side of the valve stem in a circumferential array, a rubber pad is provided at one end of the abutment fixing sheets close to the valve stem, and an external thread is provided at one end away from the valve stem;

[0025] The tightening cover is arranged between the hand wheel and the installation cylinder, the tightening cover is coaxially sleeved on the outer sides of the plurality of abutting fixing sheets, and the tightening cover is provided with an internal connecting thread matched with the external thread;

[0026] By adopting the above technical solution, when the pneumatic drive of the opening and closing mechanism cannot work under special circumstances, the internal connection thread in the tightening cover is screwed downward so that the external thread on the multiple abutment fixing plates at the top of the installation tube is connected. Since the abutment fixing plates have a certain elasticity, when the tightening cover and the sleeve are fixed on the multiple abutment fixing plates, the multiple abutment fixing plates are tightly abutted against the valve stem. At this time, the valve stem is fixed by the multiple abutment fixing plates. Since the connecting rod is coaxially arranged in the valve stem, and the connecting rod and the valve stem are connected by threads;

[0027] When the handwheel is rotated clockwise again, the connecting rod cooperates with the fixed valve stem thread, so that the connecting rod drives the valve disc and the diaphragm to fit tightly against the partition flange, thereby achieving the closing of the diaphragm valve. When the handwheel is rotated counterclockwise, the connecting rod drives the valve disc and the diaphragm to separate from the partition flange, thereby achieving the opening of the diaphragm valve. It adopts a combination of manual and pneumatic methods, which is suitable for sterile and pollution-free production.

[0028] In this embodiment, the partition flange is symmetrically arranged between the feed port and the discharge port.

[0029] In this embodiment, a flow direction mark is provided on the valve body, and a bottom support is provided at the bottom of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 A schematic diagram of the overall structure of a highly sealing and corrosion-resistant pneumatic diaphragm valve provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the overall structure of a highly sealing and corrosion-resistant pneumatic diaphragm valve provided in an embodiment of the present application from another perspective;

[0033] Figure 3 A schematic diagram of the internal structure of a highly sealing and corrosion-resistant pneumatic diaphragm valve provided in an embodiment of the present application;

[0034] Figure 4 A schematic diagram of a push rod structure of a highly sealing and corrosion-resistant pneumatic diaphragm valve provided in an embodiment of the present application;

[0035] Figure 5 A schematic diagram of a switching mechanism of a highly sealing and corrosion-resistant pneumatic diaphragm valve provided in an embodiment of the present application;

[0036] Figure 6 for Figure 5 The enlarged schematic diagram of part A shown in FIG.

[0037] Figure 7 A schematic diagram of a screw-on cover structure of a highly sealing, corrosion-resistant pneumatic diaphragm valve provided in an embodiment of the present application.

[0038] Among them, the reference numerals in the figure are:

[0039] 1. Valve body; 11. Feed inlet; 12. Discharge outlet; 13. Partition flange; 14. Valve cover; 141. Eyebolt; 15. Flow direction indicator; 16. Bottom support; 2. Mounting cylinder; 21. First vent hole; 211. Upper sealing chamber; 22. Second vent hole; 221. Lower sealing chamber; 23. Moving disk; 231. Limiting ring; 24. Valve stem; 241. Connecting rod; 25. Valve disc; 26. Diaphragm; 27. Vortex spring; 3. Abutment fixing plate; 31. Tightening cover; 311. Internal connecting thread; 32. Handwheel. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0046] It should be noted that, in the present application, words such as "in the present embodiment", "exemplarily", "for example", etc. are used to indicate examples, illustrations or explanations. Any embodiment or design described in the present application as "in the present embodiment", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in the present embodiment", "exemplarily", "for example", etc. is intended to present related concepts in a concrete way, meaning that specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] The pneumatic diaphragm valve is a special form of shut-off valve. Its opening and closing parts are a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving components, so it is called a pneumatic diaphragm valve; the most prominent feature of the pneumatic diaphragm valve is that the diaphragm separates the inner cavity of the lower valve body from the inner cavity of the upper valve cover, so that the valve stem, valve disc and other parts above the diaphragm are not corroded by the medium, eliminating the packing sealing structure and preventing the medium from leaking.

[0048] The pneumatic diaphragm valve in the related technology has two water pipes fixedly connected to the outer wall of the water valve chamber, and two water tanks are fixedly connected at the connection between the two water pipes and the water valve chamber. Three valves are opened on the side walls of the water tanks and located opposite to the water pipes. A pressure block pressure plate is set, and three slidable I-shaped pressure blocks are fixedly installed inside the pressure block pressure plate. Through the rise and fall of the conical pressure block, the vertical side wall of the conical pressure block will squeeze the I-shaped pressure block. The lifting height of the conical pressure block can be changed to control the number of squeezed I-shaped pressure blocks, so as to achieve the effect of controlling the water flow by switching the number of valves.

[0049] Based on this, in order to improve the problem in the related technology that only pneumatic methods are used to control the valve disc and the diaphragm to open and close the valve body, which cannot be used in an emergency, and when the diaphragm blocks the valve seat, the diaphragm is easy to expand and enter the flow channel, causing friction with the valve seat, thereby accelerating the wear of the diaphragm, the embodiment of the present application provides the following solution.

[0050] See also Figures 1 to 7 The embodiment of the present application provides a highly sealing and corrosion-resistant pneumatic diaphragm valve, comprising: a valve body 1, a valve cover 14, a mounting cylinder 2, an opening and closing mechanism and a switching mechanism. A feed port 11 is provided at one end of the valve body 1, and a discharge port 12 is provided at the other end. A through hole is provided on one side of the valve body 1 close to the valve cover 14. A partition flange 13 is provided in the valve body 1, and the mounting cylinder 2 is arranged on the valve cover 14; the opening and closing mechanism is arranged in the valve body 1 and the mounting cylinder 2, and the opening and closing mechanism is used to cooperate with the partition flange 13 to realize the opening and closing control of the valve body 1; the switching mechanism is arranged on the mounting cylinder 2, and the switching mechanism is used to realize the switching manual control when the opening and closing mechanism cannot control the opening and closing of the valve body 1;

[0051] The mounting tube 2 is provided with a first vent hole 21 and a second vent hole 22, respectively. The first vent hole 21 and the second vent hole 22 are connected to an external air compression system. A set of limit rings 231 is provided in the mounting tube 2. One end of the valve stem 24 close to the valve body 1 is coaxially rotatably connected with the valve disc 25. The diaphragm 26 is provided between the valve cover 14 and the valve body 1, and the diaphragm 26 is fixedly connected with the valve disc 25.

[0052] With such an arrangement, when in use, the feed port 11 and the discharge port 12 at both ends of the valve body 1 are connected to the pipeline respectively, and air is delivered and sucked into the first air vent 21 and the second air vent 22 respectively through an external air compression system. Here, when air is delivered into the upper sealing chamber 211, the compressed air causes the movable disk 23 to move downward, thereby driving the valve stem 24 and the valve flap 25 rotatably connected to the valve stem 24 to move downward, and the valve flap 25 pushes the diaphragm 26 downward to fit tightly against the partition flange 13, thereby closing the valve body 1, and vice versa, opening the valve body 1.

[0053] See also Figure 1 and Figure 3 The opening and closing mechanism includes: a moving disk 23, a valve stem 24, a valve disc 25, a diaphragm 26 and a spiral spring 27. The moving disk 23 is arranged in a set of limiting rings 231. The outer wall of the moving disk 23 is in close contact with the inner wall of the mounting tube 2. The moving disk 23 divides the interior of the mounting tube 2 into an upper sealing chamber 211 and a lower sealing chamber 221. A set of limiting rings 231 is arranged between the first vent hole 21 and the second vent hole 22.

[0054] The movable plate 23 is coaxially fixedly connected with the valve stem 24, the valve stem 24 is coaxially arranged in the mounting hole, and the valve stem 24 is arranged in the valve body 1, the valve cover 14 and the mounting cylinder 2, the end of the valve stem 24 close to the valve body 1 is coaxially rotatably connected with the valve disc 25, the diaphragm 26 is arranged between the valve cover 14 and the valve body 1, the diaphragm 26 is fixedly connected with the valve disc 25, the vortex spring 27 is coaxially sleeved on the outside of the valve stem 24, one end of the vortex spring 27 is fixedly connected with the valve cover 14, and the other end is fixedly connected with the valve disc 25;

[0055] The effect of such arrangement is that the first air hole 21 and the second air hole 22 are connected respectively through an external air compression system, and when the diaphragm valve is opened and closed, air is delivered and sucked into the first air hole 21 and the second air hole 22 respectively through the external air compression system. Here, when air is delivered into the upper sealing chamber 211, the compressed air causes the movable disk 23 to move downward, thereby driving the valve stem 24 and the valve flap 25 rotatably connected to the valve stem 24 to move downward, and the valve flap 25 pushes the diaphragm 26 downward to fit tightly against the partition flange 13. The external air compression system cooperates with the first air hole 21 and the second air hole 22 respectively, so that the flow characteristics of the diaphragm valve are close to the quick-opening characteristics, which is suitable for the needs of automatic control, program control or flow regulation.

[0056] See also Figure 3 , the partition flange 13 is symmetrically arranged between the feed port 11 and the discharge port 12;

[0057] The effect of such arrangement is that the flow channel in the valve body 1 is symmetrically arranged in an "eight" shape, and the partition flange 13 located in the middle is in contact with the diaphragm 26. The inside of the valve body 1 is straight, without shrinkage, accumulation, or dead angle, and it is not easy for the medium to be blocked or agglomerated. It has a self-cleaning effect. The inner wall of the valve body 1 is provided with a corrosion-resistant lining, and the up and down movement of the diaphragm 26 is used for regulation, which is suitable for the regulation of strong corrosive media such as strong acids and strong alkalis.

[0058] As the diaphragm 26 expands, the expanded diaphragm 26 abuts against both sides of the partition flange 13, avoiding a large area of ​​contact between the diaphragm 26 and the valve seat, reducing the wear of the diaphragm 26. At the same time, the diaphragm 26 is arranged between the valve body 1 and the valve cover 14 to separate the valve body 1 and the valve cover 14, preventing the medium flowing in the valve body 1 from entering the opening and closing mechanism in the valve cover 14.

[0059] See also Figures 3 to 7The switching mechanism includes: a connecting rod 241, a plurality of abutting fixing sheets 3, a tightening cover 31 and a hand wheel 32. The connecting rod 241 is coaxially arranged in the valve stem 24, and the connecting rod 241 and the valve stem 24 are connected by threads. One end of the connecting rod 241 is coaxially fixedly connected to the hand wheel 32, and the other end is coaxially fixedly connected to the valve disc 25. The plurality of abutting fixing sheets 3 are evenly fixedly arranged on the mounting tube 2, and the plurality of abutting fixing sheets 3 are arranged around the outer side of the valve stem 24 in a circumferential array. The plurality of abutting fixing sheets 3 are provided with a rubber pad at one end close to the valve stem 24, and are provided with an external thread at one end away from the valve stem 24.

[0060] The tightening cover 31 is arranged between the hand wheel 32 and the installation tube 2, and the tightening cover 31 is coaxially sleeved on the outer sides of the plurality of abutting fixing sheets 3, and an internal connecting thread 311 matching the external thread is arranged inside the tightening cover 31;

[0061] The effect of such arrangement is that when the pneumatic drive of the opening and closing mechanism cannot work under special circumstances, the internal connection thread 311 in the tightening cover 31 is screwed downward so that the external threaded connection thread 311 on the multiple abutting fixing sheets 3 at the top of the installation tube 2 is connected. Since the abutting fixing sheets 3 have a certain elasticity, when the tightening cover 31 is fixed on the multiple abutting fixing sheets 3, the multiple abutting fixing sheets 3 are tightly abutted against the valve stem 24. At this time, the valve stem 24 is fixed by the multiple abutting fixing sheets 3. Since the connecting rod 241 is coaxially arranged in the valve stem 24, and the connecting rod 241 is connected to the valve stem 24 through a threaded connection;

[0062] When the hand wheel 32 is rotated clockwise again, the connecting rod 241 is threadedly engaged with the fixed valve stem 24, so that the connecting rod 241 drives the valve flap 25 and the diaphragm 26 to be tightly attached to the partition flange 13, thereby realizing the closing of the diaphragm valve. When the hand wheel 32 is rotated counterclockwise, the connecting rod 241 drives the valve flap 25 and the diaphragm 26 to separate from the partition flange 13, thereby realizing the opening of the diaphragm valve. It adopts a combination of manual and pneumatic methods, which is suitable for sterile and pollution-free production.

[0063] See also Figure 1 and Figure 2 , a flow direction mark 15 is provided on the valve body 1, and a bottom support member 16 is provided at the bottom of the valve body 1;

[0064] The effect of such a configuration is that it is convenient for the staff to distinguish the feed port 11 and the discharge port 12 of the valve body 1, and it is convenient to install the valve body 1 and the connecting pipeline.

[0065] See also Figure 1 to Figure 2 The valve body 1 and the valve cover 14 are provided with a plurality of bolt mounting holes, each of which is provided with a lifting eye bolt 141. The mounting tube 2 and the valve cover 14 are provided with mounting holes, and a sealing ring is provided on the outer side of the mounting hole.

[0066] The effect of such arrangement is that the valve cover 14 and the valve body 1 are installed through multiple lifting bolts 141, which makes it convenient to replace the diaphragm 26 on site and in a short time, and is easy to maintain. A sealing ring is provided on the outside of the mounting hole to prevent the compressed air in the upper sealing chamber 211 and the lower sealing chamber 221 from leaking through the valve stem 24 and the mounting hole, thereby ensuring the normal operation of the pneumatic opening and closing mechanism.

[0067] From the above, we can see that the working principle of this application is as follows:

[0068] When in use, the first vent hole 21 and the second vent hole 22 are communicated with by an external air compression system. When the diaphragm valve is opened and closed, air is delivered and sucked into the first vent hole 21 and the second vent hole 22 by the external air compression system. When air is delivered into the upper sealing cavity 211, the compressed air causes the movable disk 23 to move downward, thereby driving the valve stem 24 and the valve flap 25 rotatably connected to the valve stem 24 to move downward. The valve flap 25 pushes the diaphragm 26 downward to be in close contact with the partition flange 13, thereby closing the valve body 1. Otherwise, the valve body 1 is opened.

[0069] When the pneumatic drive of the opening and closing mechanism cannot work under special circumstances, the internal connection thread 311 in the tightening cover 31 is screwed downward to connect with the external thread on the multiple abutting fixing pieces 3 at the top of the installation tube 2. Since the abutting fixing pieces 3 have a certain elasticity, when the tightening cover 31 is fixed on the multiple abutting fixing pieces 3, the multiple abutting fixing pieces 3 are tightly abutted against the valve stem 24. At this time, the valve stem 24 is fixed by the multiple abutting fixing pieces 3. Since the connecting rod 241 is coaxially arranged in the valve stem 24, and the connecting rod 241 is connected to the valve stem 24 through a thread.

[0070] When the hand wheel 32 is rotated clockwise again, the connecting rod 241 is threadedly engaged with the fixed valve stem 24, so that the connecting rod 241 drives the valve flap 25 and the diaphragm 26 to be tightly attached to the partition flange 13, thereby achieving the closing of the diaphragm valve. When the hand wheel 32 is rotated counterclockwise, the connecting rod 241 drives the valve flap 25 and the diaphragm 26 to separate from the partition flange 13, thereby achieving the opening of the diaphragm valve.

[0071] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

[0072] Although the present application has been described with reference to several specific embodiments, it should be understood that the present application is not limited to the specific embodiments disclosed. The present application is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A highly sealing and corrosion-resistant pneumatic diaphragm valve, characterized in that: include: A valve body (1), a valve cover (14), a mounting cylinder (2), an opening and closing mechanism and a switching mechanism, wherein the valve body (1) is provided with a feed port (11) at one end and a discharge port (12) at the other end, a through hole is provided on a side of the valve body (1) close to the valve cover (14), a partition flange (13) is provided inside the valve body (1), and the mounting cylinder (2) is arranged on the valve cover (14); An opening and closing mechanism, the opening and closing mechanism being arranged in the valve body (1) and the mounting cylinder (2), the opening and closing mechanism being used to cooperate with the partition flange (13) to realize opening and closing control of the valve body (1); A switching mechanism is arranged on the mounting cylinder (2), and is used to implement switching manual control when the opening and closing mechanism is unable to perform opening and closing control on the valve body (1).

2. A highly sealing and corrosion-resistant pneumatic diaphragm valve according to claim 1, characterized in that: The valve body (1) and the valve cover (14) are each provided with a plurality of bolt mounting holes, and each of the plurality of bolt mounting holes is provided with eye bolts (141).

3. The high sealing and corrosion resistant pneumatic diaphragm valve according to claim 1 is characterized in that: The installation tube (2) is provided with a first vent hole (21) and a second vent hole (22), respectively. The first vent hole (21) and the second vent hole (22) are connected to an external air compression system. A group of limiting rings (231) is provided in the installation tube (2).

4. The high sealing and corrosion resistant pneumatic diaphragm valve according to claim 3 is characterized in that: The installation cylinder (2) and the valve cover (14) are both provided with installation holes, and a sealing ring is provided on the outside of the installation hole.

5. A highly sealing and corrosion-resistant pneumatic diaphragm valve according to claim 4, characterized in that: The opening and closing mechanism comprises: A movable disk (23), a valve stem (24), a valve flap (25), a diaphragm (26) and a volute spring (27); the movable disk (23) is arranged in a set of limiting rings (231); the outer wall of the movable disk (23) is in close contact with the inner wall of the mounting cylinder (2); the movable disk (23) divides the interior of the mounting cylinder (2) into an upper sealing chamber (211) and a lower sealing chamber (221); and the set of limiting rings (231) is arranged between the first vent hole (21) and the second vent hole (22); The movable disk (23) is coaxially fixedly connected to the valve stem (24), the valve stem (24) is coaxially arranged in the mounting hole, and the valve stem (24) is arranged in the valve body (1), the valve cover (14) and the mounting cylinder (2), the end of the valve stem (24) close to the valve body (1) is coaxially rotatably connected to the valve disc (25), the diaphragm (26) is arranged between the valve cover (14) and the valve body (1), the diaphragm (26) is fixedly connected to the valve disc (25), the vortex spring (27) is coaxially sleeved on the outside of the valve stem (24), one end of the vortex spring (27) is fixedly connected to the valve cover (14), and the other end is fixedly connected to the valve disc (25).

6. A highly sealing and corrosion-resistant pneumatic diaphragm valve according to claim 5, characterized in that: The switching mechanism comprises: A connecting rod (241), a plurality of abutment fixing plates (3), a tightening cover (31) and a hand wheel (32), wherein the connecting rod (241) is coaxially arranged in the valve stem (24), and the connecting rod (241) and the valve stem (24) are connected by a thread, one end of the connecting rod (241) is coaxially fixedly connected to the hand wheel (32), and the other end is coaxially fixedly connected to the valve flap (25), the plurality of abutment fixing plates (3) are evenly fixedly arranged on the mounting tube (2), and the plurality of abutment fixing plates (3) are arranged around the outer side of the valve stem (24) in a circular array, and the plurality of abutment fixing plates (3) are provided with a rubber pad at one end close to the valve stem (24), and are provided with an external thread at one end away from the valve stem (24); The tightening cover (31) is arranged between the hand wheel (32) and the installation cylinder (2), the tightening cover (31) is coaxially sleeved on the outer sides of a plurality of abutting fixing sheets (3), and an internal connecting thread (311) matching the external thread is arranged inside the tightening cover (31).

7. The high sealing and corrosion resistant pneumatic diaphragm valve according to claim 1, characterized in that: The partition flange (13) is symmetrically arranged between the feed port (11) and the discharge port (12).

8. The high sealing and corrosion resistant pneumatic diaphragm valve according to claim 1, characterized in that: The valve body (1) is provided with a flow direction mark (15), and the bottom of the valve body (1) is provided with a bottom support member (16).

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