Self-positioning antifouling flat gate valve

Abstract

The utility model provides a self-positioning and antifouling flat gate valve which comprises a valve body, a valve cavity and a medium channel communicated with the valve cavity are arranged in the valve body. A left valve seat and a right valve seat are arranged at the intersection of the medium channel and the valve cavity, a gate plate is connected between the left valve seat and the right valve seat, the gate plate is matched with the left valve seat and the right valve seat in a sealing mode, and the gate plate is driven by a valve rod to move up and down. A spring hole is formed in the position, in axial contact with the valve body, of the valve seat, and a spring is installed in the spring hole. A positioning block is arranged in the valve body and is coaxial with the gate plate in the longitudinal direction, and a positioning groove matched with the positioning block is formed in the bottom of the gate plate. And the scraping plate is installed in the valve body and arranged at the upper end of the valve seat, and the valve rod is arranged on the scraping plate in a penetrating mode. The spring is arranged at the axial contact position of the valve seat and the valve body, sealing of the valve seat and the gate plate is kept, abrasion to the sealing face of the valve seat is reduced, and the service life of the gate valve is prolonged. And the scraping plate removes dirt on the surface of the gate plate, and the sealing performance of the gate valve is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a self-positioning and anti-fouling flat gate valve. Background Art

[0002] Gate valves are generally used to open or close the flow of media in pipelines. The opening and closing parts are gates, and the movement direction of the gates is perpendicular to the direction of the fluid.

[0003] The existing flat gate valve has the following defects during its use: 1. The gate plate and the valve seat are in hard contact. After long-term use, a certain degree of wear will occur between the two, which shortens the service life of the gate valve; 2. The dirt in the medium will adhere to the surface of the gate plate. During the opening and closing process of the gate plate, the dirt will enter the valve cavity with the gate plate, contaminating the valve stem and wearing the packing, causing defects such as gate valve leakage; 3. When the gate valve is in a closed state, the bottom of the gate plate is suspended in the valve body, and the upper part of the gate plate is subjected to the medium pressure, resulting in the risk of deformation of the gate plate; technical personnel in this field urgently need to solve the above technical problems. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a self-positioning, anti-fouling flat gate valve, which assists the gate plate in positioning, has anti-fouling capability and strong sealing performance.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A self-positioning, anti-fouling flat gate valve, comprising

[0007] A valve body, which is provided with a valve cavity and a medium channel communicating with the valve cavity;

[0008] A left valve seat and a right valve seat are respectively provided at the intersection of the medium channel and the valve cavity, a gate plate is connected between the left valve seat and the right valve seat, the gate plate is sealed with the left valve seat and the right valve seat, and the gate plate is driven by the valve stem to move up and down;

[0009] A valve cover, which is arranged at the upper end of the valve body and is sealed and connected to the valve body;

[0010] A bracket, which is arranged at the upper end of the valve cover and is sealed with the valve cover, and a gear box is installed at the upper end of the bracket;

[0011] A gear box, the input end of which is connected to the handle, and the output end of which is connected to the valve stem, and the handle is manually rotated to drive the valve stem to move up and down;

[0012] A spring hole is provided on the valve seat at a position in axial contact with the valve body, and a spring is installed in the spring hole;

[0013] A positioning block is provided in the valve body coaxially with the gate plate in the longitudinal direction, and a positioning groove matching the positioning block is provided at the bottom of the gate plate;

[0014] A scraper is installed in the valve body and arranged at the upper end of the valve seat, and the valve stem passes through the scraper.

[0015] In a preferred embodiment of the present invention, the valve stem is inserted into the bracket and the valve cover and extends into the valve cavity. A recessed stuffing groove is provided at the upper end of the valve cover. The stuffing is fixedly installed in the stuffing groove by a press sleeve. The bracket is sleeved on the upper end of the valve cover and one side is fixed by bolts.

[0016] In a preferred embodiment of the present invention, the gate plate is a flat plate structure, the upper end of the gate plate is fixedly connected to the valve stem, and the two side surfaces of the gate plate are respectively provided with sealing surfaces in contact with the left and right valve seats.

[0017] In a preferred embodiment of the present invention, sealing rings are installed around the left and right valve seats in contact with the valve body.

[0018] In a preferred embodiment of the present invention, the valve cavity is divided into an upper cavity and a lower cavity, and a moving passage for the gate plate is provided therebetween.

[0019] In a preferred embodiment of the present invention, the gate plate includes an upper gate plate connected to the valve stem and a lower gate plate located below the upper gate plate. The upper gate plate and the lower gate plate are an integrally formed structure, and a guide hole connected to the medium channel is penetrated on the lower gate plate.

[0020] Beneficial effects: The utility model is a self-positioning, anti-fouling flat gate valve. The valve seat is provided with a spring at the axial contact position with the valve body. The spring continuously provides pre-tightening force to the valve seat to maintain the sealing between the valve seat and the gate. At the same time, during the opening and closing process of the gate, the gate overcomes the spring force and has a certain amount of elastic displacement in the axial direction, which reduces the hard friction with the valve seat, reduces the wear on the sealing surface of the valve seat, and improves the service life of the gate valve.

[0021] When the flat gate valve is in a closed state, the bottom of the gate is embedded in the positioning block to assist the gate in positioning and resist the lateral pressure of the medium on one side of the gate, so that the gate has good working stability and high strength;

[0022] The flat gate valve has a scraper installed in the upper cavity of the valve body to scrape off the residue of the flowing medium on the gate plate, prevent dirt from entering the upper cavity, effectively reduce the wear of the valve stem on the inner wall of the valve cover and the packing, and improve the sealing performance of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A cross-sectional view of a self-positioning, anti-fouling flat gate valve (closed state) provided by the utility model;

[0024] Figure 2 A cross-sectional view of a self-positioning, anti-fouling flat gate valve (flow state) provided by the utility model;

[0025] Figure 3 For the utility model Figure 1 A local enlarged view of point A;

[0026] Figure 4 For the utility model Figure 1 A partial enlarged view of point B.

[0027] In the figure: 1 valve body;

[0028] 2 valve seat;

[0029] 3 gates, 31 upper gate, 32 lower gate;

[0030] 4 valve stem;

[0031] 5 brackets;

[0032] 6. Gearbox;

[0033] 7. Valve cover;

[0034] 8 springs;

[0035] 9 positioning block;

[0036] 10 Scraper;

[0037] 11 Sealing ring. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] like Figure 1 As shown, the utility model provides a self-positioning, anti-fouling flat gate valve, comprising:

[0040] A valve body 1, wherein a valve cavity and a medium channel communicating with the valve cavity are provided;

[0041] A left valve seat 2 and a right valve seat 2 are respectively provided at the intersection of the medium channel and the valve cavity. A gate plate 3 is connected between the left valve seat 2 and the right valve seat 2. The gate plate 3 is sealed with the left valve seat 2 and the right valve seat 2. The gate plate 3 is driven by the valve stem 4 to move up and down. The left valve seat 2 and the right valve seat 2 are respectively provided on the left and right sides of the gate plate 3.

[0042] The valve cavity is divided into an upper cavity and a lower cavity, between which a moving passage for the gate plate 3 is provided;

[0043] A valve cover 7, which is arranged at the upper end of the valve body 1 and is sealed with the valve body 1;

[0044] A bracket 5 is arranged at the upper end of the valve cover 7 and is sealed with the valve cover 7. A gear box 6 is installed at the upper end of the bracket 5.

[0045] The gear box 6 has an input end connected to the handle and an output end connected to the valve stem 4. The handle is manually rotated to drive the valve stem 4 to move up and down. The handle is an external drive for the valve stem 4.

[0046] A spring hole is provided on the valve seat 2 at the position in axial contact with the valve body 1, and a spring 8 is installed in the spring hole;

[0047] The spring 8 continuously provides a pre-tightening force to the valve seat 2, so that the valve seat 2 is closely attached to the gate plate 3, and the sealing between the valve seat 2 and the gate plate 3 is maintained;

[0048] A positioning block 9 is provided in the valve body 1 coaxially with the gate plate 3 in the longitudinal direction, and a positioning groove matching the positioning block 9 is provided at the bottom of the gate plate 3. When the gate valve is in a closed state, the gate plate 3 is embedded in the positioning block 9 to assist in resisting the lateral pressure of the medium on the gate plate 3;

[0049] A scraper 10 is installed in the valve body 1 and arranged at the upper end of the valve seat 2, and the valve stem 4 is passed through the scraper 10;

[0050] A scraper 10 is arranged between the upper cavity of the valve body 1 and the gate plate 3. When the valve stem 4 drives the gate plate 3 to move up and down, the scraper 10 cleans the two sides of the gate plate 3 to scrape off the residue of the flowing medium on the gate plate 3 to prevent dirt from entering the upper cavity and affecting the movement of the valve stem 4. The scraper 10 is made of PEEK material, which is wear-resistant, corrosion-resistant and has a long service life. The scraper 10 can be detachably installed in the inner cavity of the valve body 1.

[0051] Based on the above embodiments, Figure 4 As shown, the valve stem 4 is inserted through the bracket 5 and the valve cover 7 and extends into the valve cavity. A recessed packing groove is provided at the upper end of the valve cover 7. The packing is fixedly installed in the packing groove by a compression sleeve. The bracket 5 is sleeved on the upper end of the valve cover 7 and one side is fixed by bolts.

[0052] The scraper 10 can effectively prevent dirt from entering the upper cavity of the valve body 1, and can effectively reduce the wear on the packing during the movement of the valve stem 4.

[0053] On the basis of the above embodiment, the gate plate 3 is a flat plate structure, the upper end of the gate plate 3 is fixedly connected to the valve stem 4, and the two side surfaces of the gate plate 3 are respectively provided with sealing surfaces in contact with the left and right valve seats 2.

[0054] On the basis of the above embodiment, a sealing ring 11 is installed around the left and right valve seats 2 in contact with the valve body 1, and forms a double seal with the spring 8 to effectively prevent leakage of the medium.

[0055] Based on the above embodiments, Figure 2 As shown, the gate plate 3 includes an upper gate plate 31 connected to the valve stem 4 and a lower gate plate 32 located below the upper gate plate 31. The upper gate plate 31 and the lower gate plate 32 are an integrally formed structure, and a guide hole communicating with the medium channel is provided through the lower gate plate 32.

[0056] When the valve stem 4 drives the lower gate plate 32 to descend into the lower cavity, the upper gate plate 31 is located in the medium passage, and the lower end of the lower gate plate 32 is nested in the positioning block 9, closing the medium from passing through and hindering the flow of the medium;

[0057] When the valve stem 4 drives the upper gate plate 31 to rise into the upper cavity, the lower gate plate 32 is located in the medium channel, the guide hole is connected with the medium channels on both sides, the flow channel is opened, and the medium passes smoothly.

[0058] It should be noted that:

[0059] The utility model provides a self-positioning, anti-fouling flat gate valve, the upper end of the valve body 1 is connected to the valve cover 7, the valve stem 4 penetrates the valve cover 7 and extends into the valve body 1, and is connected to the gate plate 3, the valve stem 4 drives the gate plate 3 to move up and down, thereby realizing the opening and closing of the valve.

[0060] like Figure 3 As shown, a cavity is provided in the moving channel below the scraper 10 and between the valve seat 2, which can store a certain amount of dirt scraped by the scraper 10, and the scraper 10 can be removed regularly for cleaning.

[0061] In summary:

[0062] The utility model is a self-positioning, anti-fouling flat gate valve. The valve seat is provided with a spring at the axial contact position with the valve body. The spring continuously provides pre-tightening force to the valve seat to maintain the sealing between the valve seat and the gate plate. At the same time, during the opening and closing process of the gate plate, the gate plate overcomes the spring force and has a certain amount of elastic displacement in the axial direction, which reduces the hard friction with the valve seat, reduces the wear on the sealing surface of the valve seat, and improves the service life of the gate valve.

[0063] When the flat gate valve is in a closed state, the bottom of the gate is embedded in the positioning block to assist positioning, while allowing one side of the gate to resist the lateral pressure of the medium, so that the gate has good working stability and high strength;

[0064] The flat gate valve has a scraper installed in the upper cavity of the valve body to scrape off the residue of the flowing medium on the gate plate, prevent dirt from entering the upper cavity, effectively reduce the wear of the valve stem on the inner wall of the valve cover and the packing, and improve the sealing performance of the gate valve.

[0065] The above shows and describes the basic principle, main features and advantages of the utility model. The front, back, left and right used in the text are not specific, mainly for a more intuitive description of the technical solution, and do not have a limiting effect. The technical personnel in this industry should understand that the above implementation is only to illustrate the technical concept and characteristics of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it, and it cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A self-positioning, anti-fouling flat gate valve, characterized in that: It comprises a valve body (1) in which a valve cavity and a medium channel communicating with the valve cavity are provided; A left valve seat (2) and a right valve seat (2) are respectively provided at the intersection of the medium channel and the valve cavity, a gate plate (3) is connected between the left valve seat (2), the gate plate (3) is sealed with the left valve seat (2), and the gate plate (3) is driven by the valve stem (4) to move up and down; A valve cover (7), which is arranged at the upper end of the valve body (1) and is sealed and connected to the valve body (1); A bracket (5) is arranged at the upper end of the valve cover (7) and is sealed with the valve cover (7), and a gear box (6) is installed at the upper end of the bracket (5); A gear box (6), the input end of which is connected to a handle, and the output end of which is connected to the valve stem (4), and the handle is manually rotated to drive the valve stem (4) to move up and down; A spring hole is provided on the valve seat (2) at a position in axial contact with the valve body (1), and a spring (8) is installed in the spring hole; A positioning block (9) is provided in the valve body (1) coaxially with the gate plate (3) in the longitudinal direction, and a positioning groove matching the positioning block (9) is provided at the bottom of the gate plate (3); A scraper (10) is installed in the valve body (1) and arranged at the upper end of the valve seat (2), and the valve stem (4) passes through the scraper (10).

2. A self-positioning, anti-fouling flat gate valve according to claim 1, characterized in that: The valve stem (4) is inserted through the bracket (5) and the valve cover (7) and extends into the valve cavity. A recessed stuffing groove is provided at the upper end of the valve cover (7). The stuffing is fixedly installed in the stuffing groove by a press sleeve. The bracket (5) is sleeved on the upper end of the valve cover (7) and one side is fixed by bolts.

3. A self-positioning, anti-fouling flat gate valve according to claim 1, characterized in that: The gate plate (3) is a flat plate structure, the upper end of the gate plate (3) is fixedly connected to the valve stem (4), and the two side surfaces of the gate plate (3) are respectively provided with sealing surfaces in contact with the left and right valve seats (2).

4. A self-positioning, anti-fouling flat gate valve according to claim 1, characterized in that: A sealing ring (11) is installed around the left and right valve seats (2) in contact with the valve body (1).

5. A self-positioning, anti-fouling flat gate valve according to claim 1, characterized in that: The valve cavity is divided into an upper cavity and a lower cavity, between which a movement passage for the gate plate (3) is provided.

6. A self-positioning, anti-fouling flat gate valve according to claim 1, characterized in that: The gate plate (3) comprises an upper gate plate (31) connected to the valve stem (4) and a lower gate plate (32) located below the upper gate plate (31); the upper gate plate (31) and the lower gate plate (32) are an integrally formed structure; a flow guide hole communicating with a medium channel is provided through the lower gate plate (32).

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