A gate valve

Abstract

The invention discloses a gate valve, and the technical scheme thereof mainly includes: a valve body, a valve cover, a valve stem and a valve plate, a cavity is arranged in the valve body, flow channels communicating with the cavity are arranged at both ends of the valve body, the valve plate is in the cavity and intercepted between the two flow channels, the valve cover is installed on the top of the valve body, the valve stem penetrates into the cavity from the valve cover and is connected to the valve plate, an annular avoidance groove is provided on the circumferential side wall of the valve plate, the side walls on both sides of the avoidance groove are arranged in an inclined manner, and the side walls on both sides of the avoidance groove are both facing the side away from the center of the valve plate, a groove for the valve plate to enter is provided on the inner side wall of the bottom of the valve body, and the cross section of the groove in the direction of the length of the flow channel is an arc shape with the middle part away from the valve cover. The arrangement of the avoidance groove and the groove allows impurities to avoid contact with the bottom of the valve plate, and is not easy to interfere with the sealing work of the valve plate. The valve plate will be affected only when the impurities in the groove accumulate to a certain extent and contact the avoidance groove, thereby reducing the frequency of cleaning the gate valve and reducing the workload of the staff.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a gate valve. Background Art

[0002] The gate valve has a gate plate for opening and closing. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled.

[0003] At present, a Chinese patent with announcement number CN105605297B discloses a wear-resistant gate valve structure, including a valve body, a valve stem and a valve plate. The valve body is provided with a valve body flow channel, and the valve stem is divided into an upper half and a lower half. The upper half includes a No. 1 rod and a No. 2 rod. The No. 1 rod is provided with a circular No. 1 through hole in the vertical direction, and the diameter of the No. 1 through hole matches the diameter of the lower half. A hand wheel is fixed to the upper end of the No. 1 rod, and an open groove is provided on the hand wheel. The lower end of the No. 1 rod is rotatably connected to the upper end of the No. 2 rod. A connecting ring is also provided at the lower end of the No. 1 rod, and a hook matching the connecting ring is provided at the upper end of the No. 2 rod. A square connecting rod is provided at the lower end of the No. 2 rod, and a square groove matching the square connecting rod is provided at the upper end of the lower half, and its lower end is connected to the valve plate.

[0004] According to the drawings in the specification of the above patent, when the gate valve is closed, in order to ensure that the valve plate can completely cut off the flow path of the valve body, a groove is often provided at the bottom of the valve body for the end of the valve plate to enter. When the fluid flowing through the valve body contains impurities such as sand, gravel, and dust, the impurities may enter the groove. Due to the obstruction of the inner wall of the groove, the fluid has little effect on the impurities in the groove, and it is difficult for the impurities to escape from the groove. When the valve plate is closed, the impurities are sandwiched between the valve plate and the bottom of the groove, so that the valve plate cannot completely seal the flow path, affecting the sealing performance of the above gate valve, so the staff needs to clean it frequently. Summary of the invention

[0005] In view of the shortcomings of the prior art, an object of the present invention is to provide a gate valve which has the advantage of reducing the workload of staff.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a gate valve, comprising a valve body, a valve cover, a valve stem and a valve plate, the valve body being provided with a cavity, both ends of the valve body being provided with flow channels connected to the cavity, the valve plate being in the cavity and intercepted between the two flow channels, the valve cover being installed on the top of the valve body, the valve stem penetrating from the valve cover into the cavity and being connected to the valve plate, an annular avoidance groove being provided on the circumferential side wall of the valve plate, the side walls on both sides of the avoidance groove being inclined, and the side walls on both sides of the avoidance groove are both facing the side away from the center of the valve plate, a groove for the valve plate to enter is provided on the inner side wall of the bottom of the valve body, and the cross-section of the groove in the length direction of the flow channel is an arc with the middle part away from the valve cover.

[0007] Through the above technical solution, when the valve plate is not intercepted between the two flow channels, as the fluid flows through the valve body, some impurities remain at the bottom of the valve body cavity, and these impurities gather to the center of the groove along the arc-shaped inner wall of the groove. When the valve plate closes the valve body, the avoidance groove of the valve plate is aligned with the center of the groove, so that the impurities can avoid contact with the bottom of the valve plate and are not easy to interfere with the sealing work of the valve plate. The valve plate will not be affected until the impurities in the groove accumulate to a certain extent and contact the side wall of the avoidance groove, thereby reducing the frequency of cleaning the gate valve and reducing the workload of the staff.

[0008] Preferably, the inner walls of the cavity communicating with the two flow channels are both abutment walls, the distance between the opposite surfaces of the two abutment walls gradually decreases from the side close to the top of the valve body to the side close to the bottom of the valve body, the valve plate is a wedge-shaped device adapted to the abutment walls, and the side walls of the groove extend to the bottom of the two abutment walls respectively.

[0009] Through the above technical solution, when closing the gate valve, as the valve plate is lowered, the sides of the valve plate are gradually restricted by the two abutment walls, so that the valve plate cannot shake, and finally the abutment walls can prevent the valve plate from moving further downward, and the valve plate cannot directly contact the bottom of the groove, so that the groove can accommodate more impurities without affecting the closing of the valve plate; and when the fluid passes through the abutment walls and enters the cavity, part of the impurities in the fluid will be intercepted by the abutment walls, reducing the amount of impurities entering the cavity, further reducing the number of impurities that may remain in the groove, extending the time required for the impurities contained in the groove to reach the upper limit, and further reducing the frequency of cleaning the gate valve.

[0010] Preferably, a mounting plate adapted to the shape of the bottom of the groove is provided in the groove, and both sides of the mounting plate are respectively located below the two abutment walls, and an elastic layer is provided on the surface of the mounting plate facing the valve plate, and the circumferential side walls of the elastic layer are arranged along the circumferential side walls of the mounting plate, and a sealing cavity is formed between the elastic layer and the mounting plate, and elastic rods are provided on both sides of the mounting plate, and the elastic rods are located in the sealing cavity, one end of the elastic rod is fixed to the side edge of the corresponding side of the mounting plate along the length direction of the flow channel, and the other end of the elastic rod is bent toward one side of the valve plate and lifts the elastic layer toward one side of the valve plate, and the elastic layer abuts against the bottom of the abutment wall.

[0011] Through the above technical solution, when the gate valve is opened, the valve plate is away from the groove, the elastic rod naturally stretches and lifts the elastic layer, so that the elastic mold fills the groove, reducing the possibility of impurities entering the groove, and the impurities falling on the elastic layer will still be affected by the fluid flow, so that some impurities can be driven by the fluid again and leave the valve body to reduce the amount of impurities remaining in the cavity; when the gate valve is closed, the valve plate contacts and squeezes the elastic rod, and the elastic rod is pressed down and gradually loses support for the elastic layer, so that the middle part of the elastic layer shrinks to one side of the mounting plate, and the impurities still on the elastic layer roll along the elastic layer to the center position of the elastic layer, so that the impurities can be placed in the avoidance groove when the valve plate is closed.

[0012] Preferably, the top of the valve body is provided with an opening communicating with the cavity, the valve cover is threadedly connected to the inner wall of the valve body opening, and the mounting plate is elastic and embedded in the groove.

[0013] Through the above technical solution, the mounting plate enters the cavity from the top opening of the valve body and is inserted into the groove, so that if the elastic layer is damaged during use, it can be repaired by replacing the entire mounting plate without replacing the entire gate valve, thereby reducing maintenance costs.

[0014] Preferably, the inner walls at both ends of the groove are provided with blocks for preventing the end of the mounting plate from escaping from the groove, and the blocks are located in the middle of the corresponding side walls of the groove.

[0015] Through the above technical solution, since the mounting plate has a certain elasticity and the two ends of the mounting plate are tilted toward the side of the valve plate relative to the middle of the mounting plate, when the elastic rod is squeezed by the valve plate, the part of the elastic layer sandwiched between the elastic rod and the valve plate will cause a certain pulling on the side wall of the mounting plate as the valve plate continues to move. The two sides of the mounting plate are limited by the wall, and the two ends of the mounting plate are blocked by the block, so that the mounting plate is not easy to move, thereby enhancing the stability of the structure.

[0016] Preferably, an inclined surface is provided on one end of the stopper facing the valve cover, and the inclined surface faces the center of the cavity.

[0017] Through the above technical solution, it is convenient for the mounting plate to pass through the block and enter the groove. The degree of deformation of the mounting plate caused by passing through the block is relatively small, the mounting plate is not prone to breakage, and the blocking effect of the block on the mounting plate in the groove is not affected.

[0018] Preferably, there are two elastic rods on each side of the mounting plate, and the ends of the two mounting plates on the same side that are not connected to the mounting plate are respectively close to the ends of the corresponding sides of the mounting plate.

[0019] Through the above technical solution, four elastic rods are arranged at four corners. When the elastic rods lift up the middle part of the elastic layer, the elastic layer in the middle of the four elastic rods can form a plane, which can reduce the obstruction to the fluid on the one hand, and can better lift up impurities on the other hand, so that the impurities can be more easily carried away by the fluid.

[0020] Preferably, an abutment block for contacting the valve plate is provided on the end of the elastic rod not connected to the mounting plate, one end of the abutment block is hinged to the elastic rod, and one end of the abutment block faces the valve plate.

[0021] Through the above technical scheme, when the valve plate squeezes the abutment block through the elastic layer and moves toward one side of the groove, the non-hinged end of the elastic rod continuously rotates, and the abutment block can adjust the angle between it and the elastic rod through its own rotation, so that the abutment block can always be in stable contact with the valve plate, making it difficult for the valve plate and the abutment block to slide, reducing the possibility of sliding friction on the elastic layer between the abutment block and the valve plate, and extending the service life of the elastic layer.

[0022] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0023] 1. By setting the avoidance groove and the arc-shaped groove, the impurities at the bottom of the cavity are prevented from contacting the valve plate as much as possible, so that the gate valve can be used normally for a longer time and the cleaning work of the staff for the gate valve is reduced;

[0024] 2. By providing a mounting seat, an elastic layer and an elastic rod, the accumulation of impurities in the cavity can be reduced, further reducing the possibility that the valve plate cannot cut off the flow channel;

[0025] 3. By embedding the mounting seat in the groove, once the elastic layer or the elastic rod is damaged, the staff can also replace the mounting seat to reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an overall cross-sectional view of an embodiment;

[0027] Figure 2 for Figure 1 A magnified view of middle;

[0028] Figure 3 It is a side view of the embodiment in the conducting state;

[0029] Figure 4 for Figure 3 Enlarged view of middle B;

[0030] Figure 5 It is a side view of the embodiment in a closed state.

[0031] In the figure, 1, valve body; 11, cavity; 12, flow channel; 13, groove; 14, stopper; 2, valve cover; 3, valve stem; 4, valve plate; 41, avoidance groove; 5, abutment wall; 6, mounting plate; 7, elastic layer; 8, elastic rod; 81, abutment block; 9, sealing cavity. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] Reference Figure 1 , is a gate valve disclosed in the present invention, comprising a valve body 1, a valve cover 2, a valve stem 3 and a valve plate 4. A cavity 11 is provided in the valve body 1, and flow channels 12 communicating with the cavity 11 are provided at both ends of the valve body 1. An opening communicating with the cavity 11 is provided on the top of the valve body 1, and the valve plate 4 is located in the cavity 11 and intercepted between the two flow channels 12. The valve cover 2 is threadedly connected to the top opening of the valve body 1, and the valve stem 3 is rotatably connected to the valve cover 2. One end of the valve stem 3 penetrates into the cavity 11 and is threadedly connected to the valve plate 4, and a handle is installed on the other end of the valve stem 3. When the valve stem 3 is rotated by the handle, the valve stem 3 will only rotate and will not move up and down. The valve stem 3 drives the valve plate 4 to move up and down through the thread, and the entire gate valve requires a small space.

[0034] See also Figure 1 , Figure 4 , the inner wall between the cavity 11 and the flow channel 12 is a buttress 5, the middle of the buttress 5 is a passage connecting the cavity 11 and the flow channel 12, the surface of the buttress 5 facing the corresponding side flow channel 12 is a funnel-shaped surface that gradually shrinks toward the central passage, and the surface of the buttress 5 away from the corresponding side flow channel 12 is an inclined surface. The distance between the inclined surfaces of the two buttresses 5 gradually decreases from the side close to the top of the valve body 1 to the side close to the bottom of the valve body 1. The valve plate 4 is provided with a threaded channel for screw connection, and the threaded channel runs through the valve plate 4. The surfaces of the valve plate 4 facing the two buttresses 5 are sealing surfaces, and the sealing surfaces are all inclined surfaces corresponding to the relative surfaces of the corresponding side buttresses 5, so that the valve plate 4 is wedge-shaped. In order to reduce the friction between the valve plate 4 and the buttress 5 during the movement, the sealing surface is annular, and the weight of the valve plate 4 is reduced. An annular avoidance groove 41 is provided on the circumferential side wall of the valve plate 4. The avoidance groove 41 is located in the middle of the thickness direction of the valve plate 4, and both ends of the threaded channel are connected to the avoidance groove 41. Both side walls of the avoidance groove 41 are inclined, and both side walls of the avoidance groove 41 face the side away from the center of the valve plate 4. The side of the valve plate 4 away from the screw rod is opposite to the bottom of the valve body 1.

[0035] See also Figure 1 , Figure 2, a groove 13 is provided on the inner side wall of the bottom of the valve body 1, and the cross section of the groove 13 in the length direction of the flow channel 12 is an arc shape with the middle part away from the valve cover 2. The groove 13 is located between the two abutment walls 5, and the side walls of the groove 13 are respectively located directly below the two abutment walls 5. Stoppers 14 are fixed on both ends of the groove 13, respectively, and the stoppers 14 are located in the middle of the width direction of the corresponding end of the groove 13 and close to the side of the valve cover 2. The length of the stopper 14 is less than the width of the avoidance groove 41 on the valve plate 4. An inclined surface is provided on the end of the stopper 14 facing the valve cover 2, and the inclined surface on the stopper 14 faces the center side of the cavity 11. When the sealing surface of the valve plate 4 is completely in contact with the surface of the abutment wall 5, the bottom of the valve plate 4 cannot touch the bottom of the groove 13, and due to the opening of the threaded channel and the avoidance groove 41, the space between the bottom of the valve plate 4 and the bottom of the valve body 1 is larger.

[0036] See also Figure 3 , Figure 4 , a mounting plate 6 is placed in the groove 13, and the shape of the mounting plate 6 is adapted to the shape of the groove bottom of the groove 13. The mounting plate 6 needs to have good elasticity so that the mounting plate 6 can be inserted into the groove 13 through the two abutment walls 5 and the two stoppers 14 by extrusion. The two ends of the mounting plate 6 are respectively against the end surfaces of the two stoppers 14 facing away from the valve cover 2, and the two side walls of the mounting plate 6 extend toward the side of the valve cover 2 along the two side walls of the groove 13 and abut against the bottom outer wall of the abutment wall 5. A semi-enclosed cavity with an opening facing upward is formed between the side walls of the mounting plate 6 and the bottom of the mounting plate 6. An elastic layer 7 is fixed on the opening of the semi-enclosed cavity of the mounting plate 6, and the circumferential side walls of the elastic layer 7 are arranged along the circumferential side walls of the mounting plate 6. The arrangement of the elastic layer 7 makes the semi-enclosed cavity a completely closed sealed cavity 9. If the elastic layer 7 is unfolded and no external force is applied to the elastic layer 7, the area of ​​the elastic layer 7 is larger than the opening area of ​​the semi-enclosed cavity of the mounting plate 6. The sealing cavity 9 is filled with a certain amount of gas, but the gas in the sealing cavity 9 is not enough to fully support the elastic layer 7 .

[0037] See also Figure 3 , Figure 5 Four elastic rods 8 are arranged in the sealing cavity 9, and two of the elastic rods 8 are respectively located on both sides of the mounting plate 6, and the two elastic rods 8 on the same side are respectively close to the two ends of the mounting plate 6. One end of the elastic rod 8 is fixed to the side edge of the corresponding side of the mounting plate 6 along the length direction of the flow channel 12, and the other end of the elastic rod 8 is bent toward the valve plate 4. An abutment block 81 for contacting the valve plate 4 is arranged on the end of the elastic rod 8 not connected to the mounting plate 6, and one end of the abutment block 81 is hinged on the elastic rod 8, and one end of the abutment block 81 pushes the elastic layer 7 toward the valve plate 4. The elastic layer 7 is flattened under the support of the four elastic rods 8, and in particular, the part of the elastic layer 7 between the four abutment blocks 81 is parallel to the flow direction of the flow channel 12.

[0038] In actual use, the materials of the mounting plate 6 and the elastic layer 7 are related to the use environment of the gate valve. For example, in a high temperature environment, the mounting plate 6 and the elastic layer 7 need to be resistant to high temperatures; in the case of circulating corrosive fluids, the mounting plate 6 and the elastic layer 7 need to be resistant to corrosion. In this embodiment, taking the gate valve used to control the flow of normal temperature water containing impurities as an example, the mounting plate 6 can be a plastic plate with waterproof ability, and the elastic layer 7 is a rubber product that is waterproof, wear-resistant, and has good elasticity. The flow channels 12 at both ends of the gate valve are respectively connected to the water pipes at both ends, and the handles must be set upward. When the gate valve is in the conducting state, the valve plate 4 is above the cavity 11, and the valve plate 4 does not have any obstacles to the two flow channels 12, and the elastic layer 7 is expanded under the support of four elastic rods 8 to cover the notch of the groove 13, so that impurities in the water cannot enter the groove 13 (this state can be referred to Figure 3 ). When the water flow needs to be cut off, the staff turns the handle to rotate the valve stem 3, and the valve stem 3 drives the valve plate 4 to move downward. The bottom of the valve plate 4 first contacts the elastic layer 7. Since the elastic layer 7 has a certain elasticity, the elastic layer 7 in contact with the valve plate 4 first deforms and reduces the force applied to the elastic rod 8, and the elastic rod 8 does not rotate significantly. As the valve plate 4 continues to move downward, the distance between the two side abutment walls 5 approaches the width of the bottom of the valve plate 4, so that the valve plate 4 gradually moves along the abutment walls 5, and the bottom of the valve plate 4 can stably contact the abutment block 81. The valve plate 4 applies force on the abutment block 81, thereby driving the elastic rod 8 to bend downward (this state can be referred to Figure 5 ). After the two sides of the elastic layer 7 are pressed and moved downward as a whole, the middle of the elastic layer 7 loses its tension, causing the middle of the elastic layer 7 to collapse downward, causing the impurities on the elastic layer 7 to gather toward the center of the elastic layer 7. After the sealing surface of the valve plate 4 is fully in contact with the corresponding abutment wall 5, the bottom of the valve plate 4 cannot contact the bottom of the mounting plate 6, and the valve plate 4 is also limited in squeezing the elastic rod 8, so as to prevent the elastic rod 8 from being excessively damaged and resulting in a short service life. After the gate valve is reopened, the elastic layer 7 is gradually stretched open as the valve plate 4 rises, and the impurities in the middle of the elastic layer 7 are not easy to roll down to the two sides of the elastic layer 7, so that the impurities in the elastic layer 7 can be located above the notch of the groove 13 after the elastic layer 7 is reopened, making it easier for the impurities to be carried away by the water flow.

[0039] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gate valve, comprising a valve body (1), a valve cover (2), a valve stem (3) and a valve plate (4), wherein a cavity (11) is provided in the valve body (1), flow channels (12) communicating with the cavity (11) are provided at both ends of the valve body (1), the valve plate (4) is located in the cavity (11) and intercepted between the two flow channels (12), the valve cover (2) is mounted on the top of the valve body (1), the valve stem (3) penetrates from the valve cover (2) into the cavity (11) and is connected to the valve plate (4), wherein: An annular avoidance groove (41) is provided on the circumferential side wall of the valve plate (4), and the side walls on both sides of the avoidance groove (41) are arranged in an inclined manner, and the side walls on both sides of the avoidance groove (41) are both oriented toward a side away from the center of the valve plate (4). A groove (13) for the valve plate (4) to enter is provided on the bottom inner side wall of the valve body (1), and the cross section of the groove (13) in the length direction of the flow channel (12) is an arc shape with the middle part away from the valve cover (2). The inner walls of the cavity (11) communicating with the two flow channels (12) are both abutment walls (5), and the opposing surfaces of the two abutment walls (5) are The distance between the two sides of the groove (13) gradually decreases from the side close to the top of the valve body (1) to the side close to the bottom of the valve body (1), the valve plate (4) is a wedge-shaped device that matches the abutment wall (5), the side walls of the groove (13) extend to the bottom of the two abutment walls (5) respectively, the groove (13) is provided with a mounting plate (6) that matches the shape of the groove bottom of the groove (13), the two sides of the mounting plate (6) are respectively located below the two abutment walls (5), the mounting plate (6) is provided with an elastic layer (7) on the surface facing the valve plate (4), and the circumferential side wall of the elastic layer (7) is along the The circumferential side wall of the mounting plate (6) is provided, a sealing cavity (9) is formed between the elastic layer (7) and the mounting plate (6), elastic rods (8) are provided on both sides of the mounting plate (6), the elastic rods (8) are located in the sealing cavity (9), one end of the elastic rod (8) is fixed to the side edge of the corresponding side of the mounting plate (6) along the length direction of the flow channel (12), the other end of the elastic rod (8) is bent toward the valve plate (4) and lifts the elastic layer (7) toward the valve plate (4), there are two elastic rods (8) on each side of the mounting plate (6), and the two elastic rods (8) on the same side are provided at the same side. The two elastic rods (8) are respectively close to the two ends of the mounting plate (6); one end of the elastic rod (8) is fixed to the side edge of the corresponding side of the mounting plate (6) along the length direction of the flow channel (12); the ends of the two elastic rods (8) on the same side that are not connected to the mounting plate (6) are respectively close to the ends of the corresponding sides of the mounting plate (6); the ends of the elastic rods (8) that are not connected to the mounting plate (6) are provided with abutment blocks (81) for contacting the valve plate (4); one end of the abutment block (81) is hinged to the elastic rod (8); and one end of the abutment block (81) faces the valve plate (4).

2. A gate valve according to claim 1, characterized in that: The top of the valve body (1) is provided with an opening communicating with the cavity (11); the valve cover (2) is threadedly connected to the inner wall of the opening of the valve body (1); and the mounting plate (6) is elastic and embedded in the groove (13).

3. A gate valve according to claim 2, characterized in that: Stoppers (14) are provided on the inner walls at both ends of the groove (13) for preventing the end of the mounting plate (6) from escaping from the groove (13), and the stoppers (14) are located in the middle of the corresponding side walls of the groove (13).

4. A gate valve according to claim 3, characterized in that: An inclined surface is provided on one end of the stopper (14) facing the valve cover (2), and the inclined surface faces the center of the cavity (11).

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