Full-lining polyurethane sleeve for knife type gate valve

Abstract

The utility model discloses a full-lining polyurethane sleeve for a knife type gate valve, which is integrally formed by casting, a medium channel opening and a gate plate guide groove are arranged on the full-lining polyurethane sleeve, an anti-clamping groove is arranged at the bottom of the medium channel opening opposite to the gate plate guide groove, and scraper sealing lines are arranged on the inner walls of two sides of the opening side of the gate plate guide groove. When the polyurethane sleeve is used, the whole flashboard is wrapped by the polyurethane sleeve, and when the valve is opened, the cleaning of the flashboard, the sealing of a middle channel and the service life of the valve can be guaranteed to a great extent in the using process by depending on the matching of a plurality of scraping plates and a self-sealing groove which are arranged inside and an external contour line; in addition, a V-shaped groove is formed in the bottom of the polyurethane sleeve, so that the two-way sealing performance of the polyurethane sleeve is guaranteed, and potential safety hazards such as accumulation and blocking of media in a clamping groove in the bottom of the polyurethane sleeve can be effectively prevented through the design of the V-shaped groove.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a fully lined polyurethane sleeve for a knife gate valve. Background Art

[0002] Due to its simple structure and good sealing performance, gate valves are widely used in water supply and drainage systems such as mines. The valve sleeves of traditional gate valves are separate O-rings pasted on both sides of the valve body seat respectively, which are used to seal the gate opening when the gate plate is lifted and lowered. Such O-rings are prone to aging, wear, and leakage, and have poor durability. Especially for high and low temperature media, frequent maintenance is required. The overall thickness of the existing integrated valve sleeve is too thin, and the bottom groove is prone to sand accumulation, resulting in deformation during the opening and closing process of the valve plate and easy tearing of the valve sleeve. Content of the Utility Model

[0003] In view of the prior art, the purpose of the utility model is to provide a polyurethane full lining for the gate plate of a knife gate valve, which can enhance the sealing performance of the gate plate and achieve self-cleaning to improve the use of the gate valve.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is: a fully lined polyurethane sleeve for a knife gate valve, the lining sleeve is integrally cast, and a medium port and a gate plate guiding groove are arranged on it. An anti-card slot is also arranged at the bottom of the medium port relative to the gate plate guiding groove, and scraping seal lines are arranged on both inner walls of the opening side of the gate plate guiding groove.

[0005] As a further setting of the above solution, the scraping seal lines on both inner walls of the gate plate guiding groove are opposite, and a contour line is arranged on the outside of the gate plate guiding groove for the scraping seal line.

[0006] As a further setting of the above solution, inner seal lines are arranged on both inner walls of the opening of the gate plate guiding groove, and corresponding outer pressing lines are arranged for the inner seal lines.

[0007] As a further setting of the above solution, the inner contour diameter of the bottom of the gate plate guiding groove is constricted towards the middle, and the diameter contour size in the middle is set to be smaller than the contour size of the gate plate structure.

[0008] As a further setting of the above solution, the cross-sections of the gate plate guiding groove and the anti-card slot are in a W shape, and the anti-card slot is located at the lowermost end of the medium port, and inclined surfaces are arranged on both sides of the anti-card slot for transition with the inner wall of the medium port.

[0009] As a further setting of the above solution, a reinforcing part is also arranged on the medium port, and the reinforcing part is used to enhance the depth of the gate plate guiding groove relative to the medium port and the strength of the lining sleeve relative to the middle of the medium port.

[0010] The fully lined polyurethane sleeve of the present utility model is applied to a knife gate valve, and its beneficial effects at least include the following:

[0011] 1. It is made of polyurethane (PU) material, so it has the characteristics of oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, excellent elasticity, etc. When it is applied to a knife gate valve, it has good sealing performance, high strength and wear resistance;

[0012] 2. When the fully lined polyurethane sleeve of this embodiment is used for a knife gate valve, it is formed by combining a two-piece valve body and an integral polyurethane sleeve. The inner cavity of the valve is directly blocked from the direct contact between the medium and the valve body due to the fully lined polyurethane, which can greatly improve the overall wear resistance and sealing performance of the valve, and is very suitable for various harsh working conditions such as pipelines with high sealing requirements and high-strength medium scouring;

[0013] 3. When in use, the polyurethane sleeve wraps the entire gate plate. When opening the valve, relying on multiple internal scrapers and self-sealing grooves in cooperation with the external contour line, it can greatly ensure the cleanliness of the gate plate, the sealing in the middle and the service life of the valve during the use process; in addition, a V-shaped groove is provided at the bottom of the polyurethane sleeve. The design of the V-shaped groove can effectively prevent potential safety hazards such as the accumulation of media in the bottom card slot while ensuring its double-directional sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the polyurethane lining sleeve of the present utility model.

[0015] Figure 2 It is a front view of the polyurethane lining sleeve of this embodiment.

[0016] Figure 3 It is the polyurethane lining sleeve of this embodiment Figure 2 A - A sectional view schematic diagram.

[0017] Figure 4 It is the polyurethane lining sleeve of this embodiment Figure 2 B - B sectional view schematic diagram.

[0018] Figure 5 It is of this embodiment Figure 3 Enlarged view of part A.

[0019] Figure 6 It is of this embodiment Figure 3 Enlarged view of part B.

[0020] Figure 7 It is of this embodiment Figure 3 Enlarged view of part C.

[0021] Figure 8 It is of this embodiment Figure 4 Enlarged view of part D.

[0022] Figure 9 Schematic diagram of the inner structure of the bushing for this embodiment.

[0023] Figure 10 Installation and usage state diagram of the bushing in the knife gate valve for this embodiment.

[0024] Reference numerals: 1, bushing; 2, medium port; 21, reinforcement part; 3, gate plate guiding groove; 4, anti-card slot; 41, inclined surface; 5, scraping seal line; 51, contour line; 6, inner seal line; 61, outer pressing line. Detailed implementation manners

[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0026] As shown in Figures 1-10 As shown, a fully lined polyurethane bushing for a knife gate valve of the present invention, the bushing 1 is integrally cast, and a medium port 2 and a gate plate guiding groove 3 are provided thereon. An anti-card slot 4 is further provided in the medium port 2 relative to the bottom of the gate plate guiding groove 3, and scraping seal lines 5 are provided on both inner walls of the opening side of the gate plate guiding groove 3.

[0027] As a further setting of the above solution, the scraping seal lines 5 on both inner walls of the gate plate guiding groove 3 are opposite to each other, and a contour line 51 is provided on the outer side of the gate plate guiding groove 3 for the scraping seal line 5.

[0028] As a further setting of the above solution, inner seal lines 6 are provided on both sides of the inner wall at the opening of the gate plate guiding groove 3, and corresponding outer pressing lines 61 are provided for the inner seal lines 6.

[0029] As a further setting of the above solution, the inner contour diameter of the bottom of the gate plate guiding groove 3 is constricted towards the middle, and the diameter contour dimension in the middle is set to be smaller than the contour dimension of the gate plate structure.

[0030] As a further setting of the above solution, the cross sections of the gate plate guiding groove 3 and the anti-card slot 4 are in a W shape, and the anti-card slot 4 is located at the lowermost end of the medium port 2. Inclined surfaces 41 are provided on both sides of the anti-card slot 4 for transition with the inner wall of the medium port 2.

[0031] As a further setting of the above solution, a reinforcement part 21 is further provided on the medium port 2, and the reinforcement part 21 is used to enhance the depth of the gate plate guiding groove 3 relative to the medium port 2 and the strength of the bushing 1 relative to the middle of the medium port 2.

[0032] The fully lined polyurethane bushing for the knife gate valve of this embodiment, as shown in Figures 1-9It shows a hollow bushing structure with a gate guide groove 3. A part of the bushing 1 is located between the knife gate valve bodies and is clamped and combined by the two-piece valve body. See Figure 10 , on which the medium port 2 provided is opposite to the medium flow path of the knife gate valve. When the knife gate valve is opened and closed, the knife gate moves vertically up and down relative to the bushing 1. When the valve is closed, the guide rail of the gate guide groove 3 is inserted into the bottom, completely closing the medium flow path of the knife gate valve. And as Figure 7 and Figure 8 show, the inner contour diameter of the bottom of the gate guide groove 3 is constricted towards the middle, and the diameter contour dimension in the middle is set smaller than the contour dimension of the gate structure, that is, the cross-section of the gate guide groove 3 is a structure with a middle bulge and concave sides on both sides, and the diameter of the middle bulge is smaller than the diameter of the knife gate. In this way, when the valve is closed, the knife gate will squeeze the middle bulge, causing the polyurethane sleeve to deform. Under the elastic reset of itself, the sealing strength with the edge of the knife gate can be enhanced. In addition, above the medium port 2, in the lifting direction of the knife gate when it is opened, under the action of the scraping seal line 5 on the inner walls on both sides in the gate guide groove 3, the scraping seal line 5 contacts the surface of the knife gate, acting like a scraper, scraping off the medium and impurities on the surface of the knife gate, completing the cleaning of the surface of the knife gate, and also preventing the medium from being brought into the gate cavity by the knife gate. A contour line 51 is also set on the outside of the gate guide groove 3. Under the fixed clamping of the two-piece valve body, the clamping force of the scraping seal line 5 is enhanced. Similarly, inner seal lines 6 are provided on both sides of the inner wall at the opening of the gate guide groove 3, and corresponding outer pressing lines 61 are set on the inner seal lines 6, which can prevent the knife gate from bringing impurities outside the valve cavity into the medium flow path.

[0033] Furthermore, with the above structural settings, an anti-card slot 4 is also provided at the gate guide groove 3 opposite the bottom of the medium port 2. The anti-card slot 4 is formed by an inclined surface 41 extending outward from the gate guide groove 3. The existence of the inclined surface 41 makes it easier for the medium to flow into the bottom gate guide groove 3 when flowing through, easier to flow out of the bottom gate guide groove 3, and thus easier to take out the medium in the bottom gate guide groove 3, thereby forming the anti-card slot 4 and avoiding the problem that the medium of the two-way sealed knife gate gets stuck in the gate guide groove 3.

[0034] In summary, the bushing of the present utility model uses polyurethane (PU) as the main material, which endows it with the characteristics of oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness, excellent elasticity, etc. of polyurethane. It has good sealing performance and high-strength wear resistance. When used in a knife gate valve, it is formed by combining a two-piece valve body and an integral polyurethane sleeve. The inner cavity of the valve is directly blocked from the direct contact between the medium and the valve body due to the full lining of polyurethane, which can greatly improve the wear resistance and sealing performance of the overall valve. It is very suitable for various harsh working conditions such as pipelines that require high sealing and have high-strength medium erosion. There are multiple scraping plates and inner sealing lines inside the polyurethane sleeve, which can greatly ensure the cleanliness of the gate plate, the sealing of the middle channel and the service life of the valve during use. There is a V-shaped groove at the bottom. The design of the V-shaped groove can effectively prevent potential safety hazards such as medium jamming while ensuring its double-sealing performance.

[0035] Obviously, those skilled in the art can make various modifications and variations to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A fully lined polyurethane sleeve for a knife gate valve, characterized in that: The bushing (1) is integrally cast, and a medium port (2) and a gate guide groove (3) are provided thereon. An anti-card slot (4) is further provided at the bottom of the medium port (2) relative to the gate guide groove (3). Scraper sealing lines (5) are provided on both inner walls of the opening side of the gate guide groove (3).

2. The fully lined polyurethane sleeve for a knife gate valve according to claim 1, characterized in that: The scraper sealing lines (5) on both inner walls of the gate guide groove (3) are opposite to each other, and a contour line (51) is provided on the outer side of the gate guide groove (3) for the scraper sealing line (5).

3. A fully lined polyurethane sleeve for a knife gate valve according to claim 1 or 2, characterized in that: Inner sealing lines (6) are provided on both sides of the inner wall at the opening of the gate guide groove (3), and corresponding outer pressing lines (61) are provided for the inner sealing lines (6).

4. The fully lined polyurethane sleeve for a knife gate valve according to claim 1, characterized in that: The inner contour diameter of the bottom of the gate guide groove (3) is constricted towards the middle, and the diameter contour dimension in the middle is set to be smaller than the gate structure contour dimension.

5. The fully lined polyurethane sleeve for a knife gate valve according to claim 1, characterized in that: The cross sections of the gate guide groove (3) and the anti-card slot (4) are in a W shape, and the anti-card slot (4) is located at the lowermost end of the medium port (2). Inclined surfaces (41) are provided on both sides of the anti-card slot (4) for transition with the inner wall of the medium port (2).

6. The fully lined polyurethane sleeve for a knife gate valve according to claim 1, characterized in that: An enhancing portion (21) is further provided on the medium port (2). The enhancing portion (21) is used to enhance the depth of the gate guide groove (3) relative to the medium port (2) and the strength of the bushing (1) relative to the middle of the medium port (2).

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