Anti-corrosion gate valve with high sealing performance

Abstract

The invention relates to the technical field of gate valves, in particular to a high-sealing-performance corrosion-resistant gate valve which comprises a valve body, a venturi tube is fixedly installed on one side of the middle of the valve body, a valve plate is slidably clamped to the middle of the valve body, the venturi tube comprises a gradually-shrinking section, a throat pipe and a gradually-expanding section, and a U-shaped communicating pipe is fixedly communicated with one side of the valve body. An electromagnetic valve is fixedly communicated with the middle of one end of the U-shaped communicating pipe, one end of the U-shaped communicating pipe is communicated with one end of the throat pipe, the other end of the U-shaped communicating pipe is communicated with one side of the gradually-broadened section, a micro impeller is rotationally installed on one side of the middle of one end of the U-shaped communicating pipe, and the valve plate abuts against one end of the gradually-broadened section. The problems that when a traditional gate valve is closed, media containing corrosive substances are prone to being accumulated at the bottom of a valve body, corrosion of the valve body is accelerated, and therefore the overall performance of the gate valve is reduced, and the service life of the gate valve is prolonged are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gate valves, and more specifically, to a high-sealing anti-corrosion gate valve. Background Art

[0002] A gate valve is a common type of valve mainly used to control the flow of fluid in a pipeline. The housing of the gate valve is usually made of materials such as cast iron, cast steel, and stainless steel, which is used to accommodate and protect internal components and connect with the pipeline to allow fluid to flow through. The working principle of the gate valve is based on the up and down movement of the gate plate in the valve body. When the valve needs to be opened, the driving device drives the gate plate to move upward through the valve stem, so that the gate plate leaves the valve seat, thereby opening the fluid passage and allowing the fluid to flow freely in the pipeline. When the valve needs to be closed, the driving device drives the valve stem to drive the gate plate to move downward, and the gate plate gradually fits with the valve seat until it is completely sealed, preventing the fluid from passing through.

[0003] When the traditional gate valve is closed, the medium containing corrosive substances is likely to accumulate at the bottom of the valve body, accelerating the corrosion of the valve body, thereby reducing the overall performance and service life of the gate valve, and there are many deficiencies in actual use. For example, when treating sewage, since the sewage contains a large amount of sediment, organic matter, and various corrosive substances, when the traditional gate valve is closed, the bottom of the valve body will become the deposition area of sediment and solid impurities. These impurities not only hinder the flow of the medium but also form an oxygen concentration difference cell, accelerating the local corrosion of the valve body. At the same time, microorganisms will multiply in large numbers in the accumulated sludge, generating corrosive gases such as hydrogen sulfide, further aggravating the corrosion of the valve body. In such an environment for a long time, pitting corrosion, crevice corrosion, etc. will also occur at the bottom of the valve body, affecting the sealing performance and structural strength of the gate valve and shortening the overall service life of the equipment. Summary of the Invention

[0004] One technical problem to be solved by the present invention is that when the traditional gate valve is closed, the medium containing corrosive substances is likely to accumulate at the bottom of the valve body, accelerating the corrosion of the valve body, thereby reducing the overall performance and service life of the gate valve. To solve the above technical problems, the present invention is realized through the following technical solutions: A high-sealing anti-corrosion gate valve includes a valve body. One side of the middle part of the valve body is fixedly installed with a Venturi tube. A valve plate is slidably clamped in the middle of the valve body. The Venturi tube includes a converging section, a throat, and a diverging section. One side of the valve body is connected and fixed with a U-shaped connecting pipe. The middle part of one end of the U-shaped connecting pipe is connected and fixed with an electromagnetic valve. One end of the U-shaped connecting pipe is connected with one end of the throat. The other end of the U-shaped connecting pipe is connected with one side of the diverging section. A micro impeller is rotatably installed on one side of the middle part of one end of the U-shaped connecting pipe. The valve plate abuts against one end of the diverging section.

[0005] In some embodiments, a sliding groove is formed in the middle of the valve body, the valve plate is slidably clamped in the middle of the sliding groove, and a valve rod is fixedly installed at the upper end of the valve plate.

[0006] In some embodiments, a valve cover is fixedly installed at the upper end of the valve body by screws, and a sleeve is fixedly installed in the middle of the upper end of the valve cover.

[0007] In some embodiments, both ends of the U-shaped communication pipe are respectively communicated with the throat of the Venturi tube and the diverging section. The diameter of the valve plate is larger than the diameter of the diverging section. The horizontal position of one end of the U-shaped communication pipe communicated with the throat is higher than that of the end communicated with the diverging section.

[0008] In some embodiments, a screw rod is fixedly connected to the upper end of the valve rod, and the valve rod is slidably clamped in the middle of the sleeve.

[0009] In some embodiments, a hollow bracket is fixedly installed at the upper end of the sleeve, and the screw rod is threadedly connected to the middle of the hollow bracket.

[0010] In some embodiments, a rotating ring is rotatably installed at the upper end of the hollow bracket, and the screw rod is threadedly connected to the middle of the rotating ring.

[0011] In some embodiments, flange plates are fixedly installed on the outer sides of both ends of the valve body.

[0012] Through the above technical solutions, compared with the prior art, the present invention discloses a highly sealed and corrosion-resistant gate valve, which has the following beneficial effects: 1. When the present invention is in use, the Venturi effect is utilized to form a negative pressure to drive the water flow, without an additional power device, to realize the automatic flushing of the bottom of the valve body, effectively remove the accumulation of corrosive media, significantly improve the corrosion resistance of the gate valve, extend the service life, cooperate with the electromagnetic valve and the opening and closing linkage of the valve plate, block the main flow channel and open the flushing channel when closing, and close the auxiliary pipeline to avoid interference when opening, so as to ensure the sealing reliability and the accuracy of water flow control. At the same time, the micro impeller in the U-shaped communication pipe rotates at a high speed under the action of the water flow, which can enhance the degree of water flow turbulence, thereby further improving the flushing effect and reducing the corrosion of the valve body by corrosive substances.

[0013] 2. When the present invention is in use, it can achieve efficient sealing. The over-sized design of the valve plate realizes tight sealing. The diameter of the valve plate is larger than the diameter of the diverging section of the Venturi tube. When the gate valve is closed, the valve plate forms an annular surface contact with the end face of the diverging section. Compared with the conventional equal-diameter fitting, the over-sized design significantly increases the contact area of the sealing surface. Under the same acting force, the larger contact area makes the pressure per unit area more uniform, thereby effectively eliminating the tiny gaps caused by insufficient pressure locally and greatly improving the sealing reliability. Even under high-pressure fluid conditions, the over-sized structure can also disperse the pressure with sufficient contact area to avoid sealing failure.

[0014] 3. When the present invention is in use, it is convenient for maintenance. The detachable valve cover is convenient for internal maintenance and reduces the maintenance cost; the standardized flange design realizes a tight connection with the pipeline to prevent leakage. At the same time, the threaded transmission and sliding guide structure of the valve stem ensure stable operation and strong installation adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0016] Figure 1 It is a schematic diagram of the overall external structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the valve body of the present invention; Figure 3 It is a schematic diagram of the connection relationship between the diverging section and the valve plate of the present invention; Figure 4 It is a schematic diagram of the connection relationship between the Venturi tube and the U-shaped connecting pipe of the present invention.

[0017] Wherein: 1. Valve body; 11. Valve cover; 12. Sliding groove; 13. Valve plate; 14. Valve stem; 15. Sleeve; 16. Hollow bracket; 17. Swivel ring; 18. Screw; 19. Flange; 2. Venturi tube; 21. Converging section; 22. Throat; 23. Diverging section; 24. U-shaped connecting pipe; 25. Micro impeller; 26. Electromagnetic valve. DETAILED DESCRIPTION OF THE INVENTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0019] Example 1: Please refer to Figures 1-4 , the present invention provides a technical solution: a high-sealing and corrosion-resistant gate valve, including a valve body 1, a Venturi tube 2 is fixedly installed on one side of the middle of the valve body 1, a valve plate 13 is slidably clamped in the middle of the valve body 1, the Venturi tube 2 includes a converging section 21, a throat 22 and a diverging section 23, a U-shaped connecting pipe 24 is fixedly connected and communicated on one side of the valve body 1, an electromagnetic valve 26 is fixedly connected and communicated in the middle of one end of the U-shaped connecting pipe 24, one end of the U-shaped connecting pipe 24 is connected and communicated with one end of the throat 22, the other end of the U-shaped connecting pipe 24 is connected and communicated with one side of the diverging section 23, a micro impeller 25 is rotatably installed on one side of the middle of one end of the U-shaped connecting pipe 24, the valve plate 13 abuts against one end of the diverging section 23, both ends of the U-shaped connecting pipe 24 are respectively connected and communicated with the throat 22 and the diverging section 23 of the Venturi tube 2, the diameter of the valve plate 13 is larger than the diameter of the diverging section 23, and the horizontal position of the end of the U-shaped connecting pipe 24 connected and communicated with the throat 22 is higher than the end of the U-shaped connecting pipe 24 connected and communicated with the diverging section 23.

[0020] In this embodiment, when water flows through the Venturi tube 2, according to the Venturi effect, the flow velocity increases and the pressure decreases at the throat 22, forming a negative pressure zone; this causes the water outside the valve body 1 to be sucked into the U-shaped connecting tube 24 under the action of the pressure difference, and the flow of water in the U-shaped connecting tube 24 can be achieved without an additional power device, achieving the effects of energy conservation and simplified structure. The valve plate 13 can slide in the middle of the valve body 1. When the valve plate 13 is closed, the electromagnetic valve 26 is synchronously opened, and the valve plate 13 tightly abuts against one end of the gradually expanding section 23. With the design advantage that the diameter of the valve plate 13 is larger than that of the gradually expanding section 23, a tight annular sealing structure is formed between the two; this over-diameter sealing design greatly enhances the sealing effect, effectively blocking the water flow in the main flow channel, preventing the medium from leaking through the gap between the valve plate 13 and the gradually expanding section 23, and ensuring the sealing reliability in the closed state of the gate valve. In this state, the water flow originally flowing in the main flow channel is forced to change its path and can only flow through the Venturi tube 2 and the U-shaped connecting tube 24; when the water flow passes through the gradually narrowing section 21 of the Venturi tube 2, according to the principle of fluid mechanics, the flow channel gradually narrows, causing the water flow velocity to increase; when entering the throat 22, the flow velocity reaches the maximum and the pressure drops to the minimum; in the gradually expanding section 23, the flow channel gradually expands, the water flow velocity slows down, and the pressure rises; this change in pressure and flow velocity forms a negative pressure zone at the throat 22 of the Venturi tube 2. At the same time, one end of the U-shaped connecting tube 24 is connected to the throat 22, and the other end is connected to the gradually expanding section 23, and the horizontal position of the end connected to the throat 22 is higher than the end connected to the gradually expanding section 23; under the negative pressure action generated by the Venturi tube 2 and with the assistance of the special height difference design of the U-shaped connecting tube 24, the water flow will flow from the gradually expanding section 23 through the U-shaped connecting tube 24 to the throat 22; during this process, the water flow will scour the bottom of the valve body 1; due to the continuous scouring action of the water flow, the medium containing corrosive substances that was originally easy to accumulate at the bottom of the valve body 1 will be carried away by the water flow and cannot be deposited at the bottom of the valve body 1. In addition, the micro impeller 25 rotatably installed in the U-shaped connecting tube 24 will also rotate at a high speed under the action of the water flow, further disturbing the water flow and enhancing the turbulence degree of the water flow; the water flow in the turbulent state has a stronger scouring force and can more effectively remove the corrosive substances attached to the bottom of the valve body 1, ensuring that the bottom of the valve body 1 always remains clean, greatly reducing the contact time and contact area between the corrosive substances and the material of the valve body 1, thereby significantly improving the corrosion resistance of the gate valve and extending the service life of the gate valve. When the valve plate 13 is opened, the main flow channel is unblocked, and the water flow normally passes through the valve body 1. At the same time, the electromagnetic valve 26 closes the U-shaped connecting tube 24 to prevent the water flow from interfering with the main flow channel.

[0021] Embodiment 2: As Figures 1-3As shown, a sliding groove 12 is provided in the middle of the valve body 1, and a valve plate 13 is slidably engaged in the middle of the sliding groove 12. A valve stem 14 is fixedly installed on the upper end of the valve plate 13. A valve cover 11 is fixedly installed on the upper end of the valve body 1 by screws. A sleeve 15 is fixedly installed in the middle of the upper end of the valve cover 11. A screw 18 is fixedly connected to the upper end of the valve stem 14. The valve stem 14 is slidably engaged in the middle of the sleeve 15. A hollow bracket 16 is fixedly installed on the upper end of the sleeve 15. The screw 18 is threadedly connected to the middle of the hollow bracket 16. A swivel 17 is rotatably installed on the upper end of the hollow bracket 16. The screw 18 is threadedly connected to the middle of the swivel 17. Flanges 19 are fixedly installed on the outer sides of both ends of the valve body 1.

[0022] In this embodiment, the sliding groove 12 opened in the middle of the valve body 1 is slidably engaged with the valve plate 13, providing precise guidance and stable support for the lifting and lowering movement of the valve plate 13; this design effectively prevents the valve plate 13 from deflecting or shaking during the opening and closing process, ensuring that the valve plate 13 can fit tightly with the gradually widened section 23 of the Venturi tube 2, achieving a good sealing effect and preventing medium leakage; at the same time, the stable sliding structure reduces the wear between the valve plate 13 and the valve body 1, and prolongs the service life of the gate valve. The valve plate 13 is connected to the screw 18 through the valve stem 14, and the valve stem 14 is slidably engaged in the sleeve 15, and the screw 18 is threadedly connected to the hollow bracket 16 and the swivel 17; when the swivel 17 is rotated, the screw 18 drives the valve stem 14 to make up and down linear motion under the action of the thread, thereby realizing the opening and closing of the valve plate 13; this transmission method has a simple structure and is easy to operate. It is convenient and can provide a large driving force to ensure that the valve plate 13 can move smoothly under different working conditions; in addition, the threaded transmission has a self-locking function. After the valve plate 13 is closed in place, it can prevent the valve stem 14 from moving by itself due to factors such as medium pressure, thereby ensuring the reliability of the gate valve seal. The valve cover 11 is fixed to the upper end of the valve body 1 by screws. This detachable connection method is convenient for the inspection and maintenance of the inside of the gate valve; when it is necessary to check the valve plate 13, the sliding groove 12 or other internal components, it is only necessary to remove the screws and remove the valve cover 11, and the internal structure can be easily cleaned, repaired and replaced with parts, which reduces the difficulty and cost of maintenance and improves the maintainability of the gate valve. The flanges 19 at both ends are designed to facilitate the connection between the gate valve and the pipeline. The flanges 19 are connected by bolts to ensure that the connection between the gate valve and the pipeline is tight and effectively prevent leakage.

[0023] like Figures 1-4As shown in the figure, when it is opened, the rotating ring 17 can be rotated. Through screw drive, the screw rod 18 drives the valve stem 14 to rise, and then drives the valve plate 13 to rise to open, so that the main flow channel is unblocked and water can normally pass through the valve body 1. At the same time, the electromagnetic valve 26 closes the U-shaped connecting pipe 24 to prevent the water flow from interfering with the main flow channel. When it is closed, the rotating ring 17 can be rotated to make the screw rod 18 drive the valve stem 14 to descend. The valve plate 13 descends and tightly abuts against one end of the gradually expanding section 23. With its over-diameter design, a tight annular sealing structure is formed to block the water flow in the main flow channel. At this time, the electromagnetic valve 26 is synchronously opened, and the water flow can only flow through the Venturi tube 2 and the U-shaped connecting pipe 24. When the water flow passes through the Venturi tube 2, the flow rate accelerates in the gradually shrinking section 21, reaches the maximum when entering the throat tube 22, and the pressure drops to the lowest, forming a negative pressure area. The flow rate slows down and the pressure rises in the gradually expanding section 23. Since one end of the U-shaped connecting pipe 24 is connected to the throat tube 22 and is at a higher position, and the other end is connected to the gradually expanding section 23 and is at a lower position, under the combined action of the negative pressure generated in the Venturi tube 2 and the height difference of the U-shaped connecting pipe 24, the water flow flows from the gradually expanding section 23 through the U-shaped connecting pipe 24 to the throat tube 22, flushing the bottom of the valve body 1 and taking away the medium containing corrosive substances that may accumulate. At the same time, the micro impeller 25 in the U-shaped connecting pipe 24 rotates at a high speed under the action of the water flow, enhancing the degree of water flow turbulence, further improving the flushing effect, reducing the corrosion of the valve body 1 by corrosive substances. The valve plate 13 slides in the sliding groove 12 in the middle of the valve body 1. The sliding groove 12 provides accurate guidance and stable support for the valve plate 13, ensuring the stability of its lifting movement, avoiding deviation or shaking, ensuring tight fit with the gradually expanding section 23 to achieve good sealing, and reducing wear at the same time. The valve plate 13 is connected to the screw rod 18 through the valve stem 14. The screw rod 18 is threadedly connected to the hollow support 16 and the rotating ring 17. Rotating the rotating ring 17 can realize the opening and closing of the valve plate 13. The screw drive structure is simple, convenient to operate, can provide a large driving force, and has a self-locking function, which can ensure the sealing reliability after the valve plate 13 is closed. The flange plates 19 at both ends of the valve body 1 are connected to the pipeline through bolts to ensure tight connection and prevent leakage. The valve cover 11 at the upper end of the valve body 1 is fixed by screws and is detachable, which is convenient for overhauling and maintaining the inside of the gate valve, reducing the maintenance difficulty and cost.

[0024] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device.

[0025] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference may be made to each other. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference may be made to the description in the method part.

[0026] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-sealing and corrosion-resistant gate valve, comprising a valve body (1), a Venturi tube (2) is fixedly installed on one side of the middle of the valve body (1), a valve plate (13) is slidably clamped in the middle of the valve body (1), and it is characterized in that: The Venturi tube (2) includes a converging section (21), a throat (22) and a diverging section (23). One side of the valve body (1) is connected and fixed with a U-shaped connecting pipe (24). The middle of one end of the U-shaped connecting pipe (24) is connected and fixed with an electromagnetic valve (26). One end of the U-shaped connecting pipe (24) is connected to one end of the throat (22), and the other end of the U-shaped connecting pipe (24) is connected to one side of the diverging section (23). A micro impeller (25) is rotatably installed on one side of the middle of one end of the U-shaped connecting pipe (24). The valve plate (13) abuts against one end of the diverging section (23).

2. The high-sealing anti-corrosion gate valve according to claim 1, characterized in that: A sliding groove (12) is formed in the middle of the valve body (1). The valve plate (13) is slidably clamped in the middle of the sliding groove (12). The upper end of the valve plate (13) is fixedly installed with a valve rod (14).

3. The high-sealing anti-corrosion gate valve according to claim 1, characterized in that: The upper end of the valve body (1) is fixedly installed with a valve cover (11) by screws. The middle of the upper end of the valve cover (11) is fixedly installed with a sleeve (15).

4. A highly-sealed and corrosion-resistant gate valve according to claim 1, wherein: Both ends of the U-shaped connecting pipe (24) are respectively connected to the throat (22) of the Venturi tube (2) and the diverging section (23). The diameter of the valve plate (13) is larger than the diameter of the diverging section (23). The horizontal position of one end of the U-shaped connecting pipe (24) connected to the throat (22) is higher than the end of the U-shaped connecting pipe (24) connected to the diverging section (23).

5. The high-sealing and corrosion-resistant gate valve according to claim 2, characterized in that: The upper end of the valve rod (14) is fixedly connected with a screw rod (18). The valve rod (14) is slidably clamped in the middle of the sleeve (15).

6. The high-sealing anti-corrosion gate valve according to claim 5, characterized in that: The upper end of the sleeve (15) is fixedly installed with a hollow bracket (16). The screw rod (18) is threadedly connected to the middle of the hollow bracket (16).

7. A highly-sealed and corrosion-resistant gate valve according to claim 6, characterized in that: The upper end of the hollow bracket (16) is rotatably installed with a rotating ring (17). The screw rod (18) is threadedly connected to the middle of the rotating ring (17).

8. The high-sealing anti-corrosion gate valve according to claim 1, characterized in that: Flange plates (19) are fixedly installed on the outer sides of both ends of the valve body (1).

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