Flat gate valve with flow guide hole

Abstract

The utility model belongs to the technical field of gate valves, and particularly relates to a flat gate valve with a flow guide hole, which comprises a valve body, a valve seat, a gate plate and a valve rod, a through flow channel and a gate plate moving cavity perpendicular to the flow channel are arranged in the valve body, the gate plate is arranged in the gate plate moving cavity and connected with the valve rod, and the gate plate can move along the axial direction under the driving of the valve rod. The valve seat is embedded in the valve body and matched with the side faces of the two sides of the gate plate, a protruding sealing ring is arranged on the valve seat, and the end face of the sealing ring is attached to the side face of the gate plate to form wide-belt-face sealing. According to the flat gate valve with the flow guide hole, the valve seat with the scraping type sealing ring structure is adopted in the flat gate valve, the scraping type sealing ring structure has a scraping effect on the gate plate when the gate plate is opened and closed up and down, dirt attached to the surface of the gate plate is removed, and on the other hand, the sealing ring is in tight running-in with the side face of the gate plate. A wide-belt-face sealing structure is provided, and sealing is more reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of gate valves, and particularly relates to a flat gate valve with a flow guiding hole. Background Art

[0002] Patent CN201720465140.5 discloses a single gate plate flat gate valve with a flow guiding hole, which includes: a valve body; a valve seat embedded in the inner wall of the valve body and cooperating with the gate plate; a valve rod, the lower end of the valve rod is clamped on the top of the gate plate and its upper end extends to the outside of the valve body through the second accommodating chamber; a sealing assembly, the sealing assembly includes a cover plate fixed on the top of the second accommodating chamber and sleeved on the valve rod and a bracket fixed on the cover plate and sleeved outside the valve rod; a gear box, the gear box is installed on the top of the bracket and connected to the valve rod; a hand wheel, the hand wheel is installed on the gear box; the single gate plate flat gate valve with a flow guiding hole has two states of opening and closing. When it is in the open state, the through hole is communicated with the flow channel; when it is in the closed state, the through hole is located in the first accommodating chamber. The sealing of the above flat gate valve with a flow guiding hole relies on the cooperation structure between the gate plate and the valve seat, and the sealing is not reliable enough. Moreover, during the use of the gate plate, dirt will gradually adhere to the gate plate, affecting the use. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the defects and deficiencies existing in the prior art, and to provide a flat gate valve with a flow guiding hole.

[0004] The technical solution adopted by the utility model is as follows: a flat gate valve with a flow guiding hole, including a valve body, a valve seat, a gate plate, and a valve rod. A through-flow channel and a gate plate moving chamber perpendicular to the flow channel are provided in the valve body. The gate plate is arranged in the gate plate moving chamber and connected to the valve rod. The gate plate can move axially under the drive of the valve rod. A flow guiding hole for conducting the flow channel is opened at the lower part of the gate plate. The valve seat is embedded in the valve body and cooperates with the two side surfaces of the gate plate. A raised sealing ring is provided on the valve seat. The end surface of the sealing ring fits the side surface of the gate plate to form a wide-band surface seal.

[0005] The sealing ring has a connection end fixedly connected to the valve seat and a sealing end forming a sealing fit with the side surface of the gate plate. The width of the sealing end is greater than the width of the connection end, and the side surface of the sealing ring includes an inclined surface, and the inclined surface is connected to the end surface of the sealing end to form an acute tip.

[0006] The valve seat is floating relative to the valve body, and a compression spring is provided between the valve seat and the valve body.

[0007] A valve seat groove is formed on the inner wall of the valve body. The valve seat is embedded in the valve seat groove. A number of blind holes are equally spaced on the side of the valve seat away from the gate plate, and the compression spring is arranged in the blind holes.

[0008] A first sealing ring groove is provided on the outer peripheral wall of the valve seat. A first O-ring is embedded in the first sealing ring groove and forms a sealing fit with the circumferential inner wall of the valve seat groove.

[0009] A second sealing ring groove is provided on the outer peripheral wall of the valve seat on the side away from the gate plate. A second O-ring is embedded in the second sealing ring groove and forms a sealing fit with the circumferential inner wall and the end face inner wall of the valve seat groove.

[0010] The valve seat has a stepped structure composed of a large ring portion with a larger radius and a small ring portion with a smaller radius. The large ring portion is arranged close to the gate plate. The valve seat groove includes a stepped structure composed of a large ring groove that seals with the large ring portion and a small ring groove that seals with the small ring portion. A second sealing ring groove is provided on the side of the small ring portion away from the gate plate. A second O-ring is embedded in the second sealing ring groove and forms a sealing fit with the circumferential inner wall and the end face inner wall of the small ring groove of the valve seat groove.

[0011] A limiting ring with a triangular protrusion is formed on the circumferential inner wall of the second sealing ring groove. The limiting ring has a limiting effect on the second O-ring and a force tending to the circumferential inner wall of the valve seat groove.

[0012] The upper end of the valve body is connected to a valve cover. The upper end of the valve cover is connected to a gland. The valve stem passes through the valve cover and the gland and is connected to a driving device. A sealing cavity for embedding a sealing component is formed between the valve stem and the valve cover and the gland. The sealing component includes a packing gasket, packing, and a packing gland from bottom to top.

[0013] The area where the packing gasket and the packing cooperate is in an inverted V shape.

[0014] The valve body is provided with a slag discharge port.

[0015] The beneficial effects of the present utility model are as follows: In the flat gate valve with a diversion hole, the valve seat with a scraping type sealing ring structure is adopted in the present utility model. When the gate plate opens and closes up and down, a scraping effect is formed on the gate plate through the scraping type sealing ring structure, so as to remove the dirt attached to the surface of the gate plate. On the other hand, through the close running-in between the sealing ring and the side surface of the gate plate, a broadband surface sealing structure is provided, and the sealing is more reliable. Description of the Drawings

[0016] 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 in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present invention.

[0017] Figure 1 Structural schematic diagram of Embodiment 1 of the present invention from one angle;

[0018] Figure 2 Structural schematic diagram of Embodiment 1 of the present invention from another angle;

[0019] Figure 3 For Figure 2 Enlarged schematic diagram of part A in;

[0020] Figure 4 For Figure 2 Enlarged schematic diagram of part B in;

[0021] Figure 5 Schematic diagram of the valve seat sealing structure of Embodiment 2 of the present invention;

[0022] In the figure, valve body - 1, flow channel - 101, gate plate moving chamber - 102, valve seat groove - 103, valve seat - 2, sealing ring - 201, blind hole - 202, first sealing ring groove - 203, second sealing ring groove - 204, limiting ring - 205, gate plate - 3, diversion hole - 301, valve rod - 4, compression spring - 5, first O - ring - 6, second O - ring - 7, valve cover - 8, gland - 9, packing gasket - 10, packing - 11, packing gland - 12, valve rod nut - 13, handwheel - 14. Specific embodiments

[0023] To make the objectives, technical solutions and advantages of the present invention clearer, the following will further describe the present invention in detail with reference to the drawings.

[0024] It should be noted that all the expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two entities or parameters with the same name but different, so "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present invention. This will not be elaborated one by one in the subsequent embodiments.

[0025] The directional and positional terms mentioned in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only with reference to the directions or positions in the attached drawings. Therefore, the directional and positional terms used are for explaining and understanding this utility model, rather than limiting the protection scope of this utility model.

[0026] Embodiment 1:

[0027] A flat gate valve with a diversion hole, as Figure 1 , Figure 2 shown, includes a valve body 1, a valve seat 2, a gate plate 3, a valve stem 4, a valve cover 8, and a gland 9. A through-flow channel 101 and a gate plate moving chamber 102 perpendicular to the flow channel are provided in the valve body 1. The gate plate 3 is arranged in the gate plate moving chamber 102 and is connected to the valve stem 4. The valve stem 4 passes through the valve cover 8 and the gland 9 and is connected to a driving device. In this embodiment, the driving device is a valve stem nut 13 threadedly connected to the valve stem 4 and a handwheel 14 for driving the valve stem nut 13 to rotate. When the handwheel 14 rotates, the gate plate 3 is driven to axially move up and down by the valve stem nut 13. A diversion hole 301 for conducting the flow channel 101 is opened at the lower part of the gate plate 3. When the diversion hole 301 is opposite to the flow channel 101, the flow channel 101 is conducted through the diversion hole 301. When the diversion hole 301 is located in the area below the flow channel 101, the flow channel 101 is cut off by the gate plate 3.

[0028] The valve seat 2 is embedded in the valve body 1 and cooperates with the two side surfaces of the gate plate 3 to form a sealing effect. In this embodiment, as Figure 3 shown, a raised sealing ring 201 is provided on the valve seat 2. The end face of the sealing ring 201 fits against the side surface of the gate plate 3 to form a wide-band surface seal, constituting a valve seat with a scraping-type sealing ring structure. When the gate plate opens and closes up and down, a scraping effect is formed on the gate plate through the scraping-type sealing ring structure to remove dirt attached to the surface of the gate plate. On the other hand, through the close running-in between the sealing ring and the side surface of the gate plate, a wide-band surface sealing structure is provided, and the sealing is more reliable.

[0029] Furthermore, the sealing ring 201 has a connection end fixedly connected to the valve seat 2 and a sealing end forming a sealing fit with the side surface of the gate plate 3. The width of the sealing end is greater than the width of the connection end, and the side surface of the sealing ring 201 includes an inclined surface, and the inclined surface is connected to the end face of the sealing end to form an acute-angle tip. In this way, the cleaning effect is better.

[0030] Furthermore, as Figure 3 shown, the valve seat 2 is floating relative to the valve body 1, and a compression spring 5 is provided between the valve seat 2 and the valve body 1. A valve seat embedding groove 103 is formed on the inner wall of the valve body 1. The valve seat 2 is embedded in the valve seat embedding groove 103. A plurality of blind holes 202 are equidistantly distributed on the side of the valve seat 2 away from the gate plate 3, and the compression spring 5 is arranged in the blind holes 202.

[0031] A first sealing ring groove 203 is provided on the outer peripheral wall of the valve seat 2, and a first O-ring seal 6 that forms a sealing fit with the circumferential inner wall of the valve seat groove 103 is embedded in the first sealing ring groove 203. A second sealing ring groove 204 is provided on the outer peripheral wall of the valve seat 2 on the side away from the gate plate 3, and a second O-ring seal 7 that forms a sealing fit with the circumferential inner wall and the end face inner wall of the valve seat groove 103 is embedded in the second sealing ring groove 204. A better sealing effect between the valve seat 2 and the valve body 1 is achieved.

[0032] A limiting ring 205 with a triangular protrusion is formed on the circumferential inner wall of the second sealing ring groove 204, and the limiting ring 205 exerts a limiting effect on the second O-ring seal 7 and a force tending towards the circumferential inner wall of the valve seat groove 103.

[0033] As Figure 4 shown, a sealing cavity for embedding a sealing assembly is formed between the valve stem 4, the valve cover 8, and the gland 9. The sealing assembly includes a packing gasket 10, packing 11, and a packing gland 12 from bottom to top. Among them, the area where the packing gasket 10 and the packing 11 cooperate is in an inverted V shape. The V-shaped contact surface is large, which exerts an upward pushing effect on the packing and helps with valve stem sealing.

[0034] The valve body 1 is provided with a slag discharge port 104 for discharging the dirt collected at the bottom of the valve body 1.

[0035] Embodiment 2:

[0036] The structure of this embodiment is substantially the same as that of Embodiment 1. The main difference is that: as Figure 5 shown, the valve seat 2 has a stepped structure composed of a large ring portion with a larger radius and a small ring portion with a smaller radius. The large ring portion is arranged close to the gate plate 3. The valve seat groove 103 includes a stepped structure composed of a large ring groove that seals with the large ring portion and a small ring groove that seals with the small ring portion. A second sealing ring groove 204 is provided on the side of the small ring portion away from the gate plate 3, and a second O-ring seal 7 that forms a sealing fit with the circumferential inner wall and the end face inner wall of the small ring groove of the valve seat groove 103 is embedded in the second sealing ring groove 204.

[0037] The valve seat in this embodiment is of a stepped type. Compared with the size of the outer diameter sealing surface of the valve seat in Embodiment 1, the size of the outer diameter sealing surface of the valve seat in this embodiment is significantly reduced. Therefore, the sealing force here is reduced, which helps to reduce the torque.

[0038] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A flat gate valve with flow guiding holes, comprising a valve body (1), a valve seat (2), a gate plate (3), and a valve stem (4). A through-flow channel (101) is provided inside the valve body (1), and a gate plate moving chamber (102) is vertically arranged relative to the flow channel. The gate plate (3) is arranged inside the gate plate moving chamber (102) and is connected to the valve stem (4). The gate plate (3) can move axially under the drive of the valve stem (4). A flow guiding hole (301) for conducting the flow channel (101) is opened at the lower part of the gate plate (3). The valve seat (2) is embedded in the valve body (1) and is matched with the two side surfaces of the gate plate (3). It is characterized in that: A raised sealing ring (201) is provided on the valve seat (2), and the end surface of the sealing ring (201) fits the side surface of the gate plate (3) to form a wide-band surface seal with the side surface of the gate plate (3); The sealing ring (201) has a connecting end fixedly connected to the valve seat (2) and a sealing end forming a sealing fit with the side surface of the gate plate (3). The width of the sealing end is greater than the width of the connecting end, and the side surface of the sealing ring (201) includes an inclined surface, and the inclined surface is connected to the end surface of the sealing end to form an acute tip.

2. The flat gate valve with a diversion hole according to claim 1, characterized in that: The valve seat (2) is floating relative to the valve body (1), and a compression spring (5) is provided between the valve seat (2) and the valve body (1).

3. The flat gate valve with flow guiding holes according to claim 2, wherein: A valve seat embedding groove (103) is formed on the inner wall of the valve body (1). The valve seat (2) is embedded in the valve seat embedding groove (103). A number of blind holes (202) are equally spaced on the side of the valve seat (2) away from the gate plate (3), and the compression spring (5) is arranged in the blind holes (202).

4. The flat gate valve with flow guiding holes according to claim 3, characterized in that: A first sealing ring embedding groove (203) is provided on the outer peripheral wall of the valve seat (2), and a first O-ring seal (6) forming a sealing fit with the circumferential inner wall of the valve seat embedding groove (103) is embedded in the first sealing ring embedding groove (203).

5. The flat gate valve with flow guiding holes according to claim 3, wherein: A second sealing ring embedding groove (204) is provided on the outer peripheral wall of the valve seat (2) on the side away from the gate plate (3), and a second O-ring seal (7) forming a sealing fit with the circumferential inner wall and the end surface inner wall of the valve seat embedding groove (103) is embedded in the second sealing ring embedding groove (204).

6. The plate gate valve with a flow guiding hole according to claim 3, characterized in that: The valve seat (2) has a stepped structure composed of a large ring part with a larger radius and a small ring part with a smaller radius. The large ring part is arranged close to the gate plate (3). The valve seat embedding groove (103) includes a stepped structure composed of a large ring groove for sealing cooperation with the large ring part and a small ring groove for sealing cooperation with the small ring part. A second sealing ring embedding groove (204) is provided on the side of the small ring part away from the gate plate (3), and a second O-ring seal (7) forming a sealing fit with the circumferential inner wall and the end surface inner wall of the small ring groove of the valve seat embedding groove (103) is embedded in the second sealing ring embedding groove (204).

7. The flat gate valve with a flow guiding hole according to claim 5 or 6, characterized in that: A limiting ring (205) with a triangular protrusion is formed on the circumferential inner wall of the second sealing ring embedding groove (204), and the limiting ring (205) has a limiting effect on the second O-ring seal (7) and a force tending to the circumferential inner wall of the valve seat embedding groove (103).

8. The flat gate valve with a flow guiding hole according to claim 1, characterized in that: The upper end of the valve body (1) is connected with a valve cover (8), the upper end of the valve cover (8) is connected with a gland (9), the valve rod (4) passes through the valve cover (8) and the gland (9) and is connected with a driving device, a sealing cavity for embedding a sealing assembly is formed between the valve rod (4) and the valve cover (8) and the gland (9), and the sealing assembly includes a packing gasket (10), packing (11), and a packing compression ring (12) from bottom to top; the area where the packing gasket (10) cooperates with the packing (11) is in an inverted V shape.

9. The flat gate valve with a diversion hole according to claim 1, characterized in that: The valve body (1) is provided with a slag discharge port (104).

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