knife gate valve

Abstract

This invention provides a knife gate valve, comprising a valve body, a screw, a rotary wheel, and a lifting rod. The valve body has a horizontally penetrating passage cavity for media to pass through. A gate plate for sealing the passage cavity is slidably connected to the valve body in a vertical direction. A receiving groove for accommodating the side edge of the gate plate is provided on the inner peripheral wall of the passage cavity, and an upward-opening embedding groove is provided on the bottom wall of the receiving groove. The screw is connected to the top of the gate plate and extends upward to the top of the valve body. The rotary wheel is rotatably connected to the top of the valve body, and the screw coaxially passes through the rotary wheel and is threadedly engaged with it. The rotary wheel can drive the screw to rise and fall to block or avoid the passage cavity by the gate plate. The lifting rod passes through the screw and the gate plate along the axial direction of the screw and is slidably connected to the screw and the gate plate. A support plate for embedding in the embedding groove to support impurities is connected to the lower end of the lifting rod. The knife gate valve provided by this invention can promptly clean impurities in the receiving groove, improving the sealing performance of the knife gate valve.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and more specifically, relates to a knife gate valve. Background Technology

[0002] Knife gate valve, also known as knife gate valve, knife gate valve, slurry valve, or mud valve, has a gate as its opening and closing element. The gate moves in a direction perpendicular to the fluid direction and cuts off the medium by using a knife-shaped gate that can cut through fibrous materials.

[0003] In the prior art, the bottom of the valve body of the knife gate valve has a receiving groove for accommodating the lower edge of the gate. When the gate is in the open state, the medium passes through the valve body and leaves some impurities in the receiving groove. These impurities will prevent the lower edge of the gate from fitting with the receiving groove when the gate is closed, thereby reducing the sealing performance of the knife gate valve. Summary of the Invention

[0004] This invention provides a knife gate valve that can promptly clean impurities in the receiving tank, thereby improving the sealing performance of the knife gate valve.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A knife gate valve is provided, comprising a valve body, a screw, a rotary wheel, and a lifting rod. The valve body has a horizontally penetrating passage cavity for the passage of medium. A gate plate for blocking the passage cavity is slidably connected to the valve body in the vertical direction. A receiving groove for accommodating the side edge of the gate plate is provided on the inner peripheral wall of the passage cavity. An embedding groove with an upward opening is provided on the bottom wall of the receiving groove. The screw is connected to the top of the gate plate and extends upward to the top of the valve body. The rotary wheel is rotatably connected to the top of the valve body. The screw is coaxially inserted through the rotary wheel and threadedly engaged with it. The rotary wheel can drive the screw to rise and fall so that the gate plate blocks or avoids the passage cavity. The lifting rod is axially inserted through the screw and the gate plate and slidably connected to them. A support plate for embedding in the embedding groove to support impurities is connected to the lower end of the lifting rod. When the gate plate is in the open state, the support plate can be moved upward to the top of the receiving groove under the lifting rod to allow the medium to flush the support plate.

[0006] In one possible implementation, the wheel includes a first threaded sleeve and a disc. The first threaded sleeve is threaded onto the outer periphery of the screw and rotatably connected to the top of the valve body. An axially extending limiting groove is provided on the outer peripheral wall of the first threaded sleeve. The disc is sleeved onto the outer periphery of the first threaded sleeve, and a limiting block with a protrusion and sliding cooperation with the limiting groove is provided on the inner peripheral wall of the disc.

[0007] In some embodiments, the top of the first threaded sleeve is provided with an elastic limiting member, and a limiting strip that can move above the limiting block to lock the limiting block in the axial upward position of the first threaded sleeve is slidably connected to the elastic limiting member.

[0008] In some embodiments, the elastic limiting member includes a connecting shell and an elastic member. The connecting shell is connected to the top of the first threaded sleeve and has a sliding cavity with an opening facing the limiting block. The limiting strip is slidably connected to the sliding cavity in a horizontal direction. One end of the elastic member is connected to the inner bottom wall of the sliding cavity and the other end is connected to the limiting strip, and it is used to elastically push the limiting strip.

[0009] In some embodiments, two elastic limiting members are symmetrically provided on both sides of the screw. The limiting strips of the two elastic limiting members can move towards each other to the top of the limiting block or move away from each other to the sides of the limiting block. The extended ends of the limiting strips have guide slopes that extend outward and downward.

[0010] In some embodiments, the valve body is provided with a mounting frame, the top of the mounting frame is provided with a mounting sleeve extending downward and fitted around the outer periphery of the lifting rod, the mounting sleeve is located above the screw, the lower end of the mounting sleeve is rotatably connected to a second threaded sleeve threaded around the outer periphery of the lifting rod, the screw and the gate plate are provided with a through cavity extending along the axial direction of the screw, the lifting rod is slidably connected in the through cavity, the outer peripheral wall of the lifting rod is provided with an axially extending positioning groove, and the inner peripheral wall of the through cavity is provided with a protruding positioning block that slides with the positioning groove.

[0011] In some embodiments, the outer peripheral wall of the second threaded sleeve is provided with a groove that extends axially to the lower end of the second threaded sleeve for the limiting block to be engaged. The wheel can move upward until the limiting block is engaged in the groove and drive the second threaded sleeve to rotate under the rotation of the wheel.

[0012] In some embodiments, the outer peripheral wall of the second threaded sleeve is provided with an extension groove that communicates with the slot and extends circumferentially, and the limiting block can pass through the slot and enter the extension groove.

[0013] In some embodiments, the lower end of the second threaded sleeve is provided with an elastic limiting element.

[0014] In some embodiments, a sealing ring is fixedly sleeved on the outer peripheral wall of the lifting rod for contacting and engaging with the inner peripheral wall of the through cavity.

[0015] Compared with the prior art, the knife gate valve provided in this embodiment can move the gate up and down by rotating the wheel to block and avoid the passage cavity. During the process of the gate avoiding the passage cavity, the medium passes through the passage cavity and leaves some impurities in the receiving groove. In order to avoid affecting the sealing performance between the lower edge of the gate and the receiving groove, the lifting rod can be pulled up to move the support plate outside the receiving groove when the gate is avoiding the passage cavity. This allows the medium to flush away the impurities on the support plate, thus cleaning the impurities in the receiving groove in time and improving the overall sealing performance of the knife gate valve. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a knife gate valve provided in an embodiment of the present invention;

[0018] Figure 2 This is an embodiment of the present invention. Figure 1 A magnified schematic diagram of the local structure at point I;

[0019] Figure 3 This is a schematic diagram of the knife gate valve from another perspective provided in an embodiment of the present invention;

[0020] Figure 4 This is an embodiment of the present invention. Figure 3 A magnified schematic diagram of the local structure at point II;

[0021] Figure 5 This is an embodiment of the present invention. Figure 2 A top view of the structure of the first threaded sleeve;

[0022] Figure 6 This is an embodiment of the present invention. Figure 2 A top sectional view of the structure of the elastic limiting component;

[0023] Figure 7 This is an embodiment of the present invention. Figure 2 A front sectional view of the middle gate, lifting rod, positioning groove, positioning block and sealing ring.

[0024] The following are the labeling elements in the figure:

[0025] 10. Valve body; 11. Passing cavity; 12. Receiving groove; 13. Embedding groove; 20. Gate plate; 30. Screw; 40. Rotary wheel; 41. Wheel disc; 411. Limiting block; 42. First threaded sleeve; 421. Limiting groove; 50. Lifting rod; 51. Support plate; 52. Positioning groove; 53. Sealing ring; 60. Elastic limiting element; 61. Limiting strip; 611. Guide slope; 62. Connecting shell; 621. Sliding cavity; 63. Elastic element; 70. Mounting frame; 71. Mounting sleeve; 72. Second threaded sleeve; 721. Slot; 722. Extension groove; 80. Through cavity; 81. Positioning block. Detailed Implementation

[0026] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0027] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, "a number" means two or more, unless otherwise explicitly specified.

[0028] Please see Figures 1 to 7 The present invention will now describe the knife gate valve provided. The knife gate valve includes a valve body 10, a screw 30, a rotary wheel 40, and a lifting rod 50. The valve body 10 has a horizontally penetrating passage cavity 11 for the passage of medium. A gate plate 20 for blocking the passage cavity 11 is slidably connected to the valve body 10 in the vertical direction. A receiving groove 12 for accommodating the side edge of the gate plate 20 is provided on the inner peripheral wall of the passage cavity 11. An upward-opening embedding groove 13 is provided on the bottom wall of the receiving groove 12. The screw 30 is connected to the top of the gate plate 20 and extends upward to the top of the valve body 10. The rotary wheel 40 is rotatably connected to the top of the valve body 10. A coaxial through-wheel 40 is provided and threadedly engaged with the through-wheel 40. The through-wheel 40 can drive the screw 30 to rise and fall so that the gate 20 can block or avoid the passage cavity 11. A lifting rod 50 is provided along the axial direction of the screw 30 and through the gate 20 and is slidably connected to the screw 30 and the gate 20. The lower end of the lifting rod 50 is connected to a support plate 51 for embedding in the embedding groove 13 to support impurities. When the gate 20 is in the open state, the support plate 51 can be moved up to the top of the receiving groove 12 under the lifting of the lifting rod 50 so that the medium can flush the support plate 51.

[0029] This application provides a knife gate valve. In actual use, the gate 20 can be moved up and down by rotating the wheel 40 to block and avoid the passage cavity 11. During the process of the gate 20 avoiding the passage cavity 11, the medium passes through the passage cavity 11 and leaves some impurities in the receiving groove 12. In order to avoid affecting the sealing performance between the lower edge of the gate 20 and the receiving groove 12, the lifting rod 50 can be pulled up to move the support plate 51 to the outside of the receiving groove 12 while the gate 20 is avoiding the passage cavity 11. This allows the medium to flush away the impurities on the support plate 51, thus cleaning the impurities in the receiving groove 12 in time and improving the overall sealing performance of the knife gate valve.

[0030] Compared with the prior art, the knife gate valve provided in this embodiment can move the gate 20 up and down by rotating the rotary wheel 40 to block and avoid the passage cavity 11. During the process of the gate 20 avoiding the passage cavity 11, the medium passes through the passage cavity 11 and leaves some impurities in the receiving groove 12. In order to avoid affecting the sealing performance between the lower edge of the gate 20 and the receiving groove 12, the lifting rod 50 can be pulled up to move the support plate 51 to the outside of the receiving groove 12 while the gate 20 is avoiding the passage cavity 11. This allows the medium to flush away the impurities on the support plate 51, thus cleaning the impurities in the receiving groove 12 in time and improving the overall sealing performance of the knife gate valve.

[0031] In one possible implementation, the aforementioned rotor 40 adopts as follows: Figure 1 , Figure 3 , Figure 4 and Figure 5 The structure shown is described in the following document. Figure 1 , Figure 3 , Figure 4 and Figure 5 The rotating wheel 40 includes a first threaded sleeve 42 and a wheel 41. The first threaded sleeve 42 is threadedly fitted on the outer periphery of the screw 30 and rotatably connected to the top of the valve body 10. An axially extending limiting groove 421 is provided on the outer peripheral wall of the first threaded sleeve 42. The wheel 41 is fitted on the outer periphery of the first threaded sleeve 42. A limiting block 411 with a protrusion and sliding cooperation with the limiting groove 421 is provided on the inner peripheral wall of the wheel 41.

[0032] Specifically, the limiting groove 421 extends axially along the first threaded sleeve 42 to both the upper and lower ends of the first threaded sleeve 42. Through the mutual limiting cooperation of the limiting block 411 and the limiting groove 421, the wheel 41 can drive the first threaded sleeve 42 to rotate when it rotates, thereby driving the screw 30 to move up and down, that is, driving the gate 20 to move up and down. The wheel 41 can also be pulled upwards away from the first threaded sleeve 42, which facilitates the replacement of the wheel 41.

[0033] In some embodiments, see Figure 2 and Figure 4The top of the first threaded sleeve 42 is provided with an elastic limiting member 60, and a limiting strip 61 that can move above the limiting block 411 to lock the limiting block 411 in the axial upward position of the first threaded sleeve 42 is slidably connected to the elastic limiting member 60.

[0034] Specifically, the limiting strip 61 is used to prevent the limiting block 411 from disengaging from the limiting groove 421, thereby ensuring that the wheel 41 is stably fitted onto the outer periphery of the first threaded sleeve 42 and controlling the lifting and lowering of the gate 20. When it is necessary to disassemble the wheel 41, simply move the limiting strip 61 to both sides of the limiting block 411, and the wheel 41 can be pulled upwards away from the first threaded sleeve 42, facilitating the replacement of the wheel 41.

[0035] In some embodiments, see Figure 2 , Figure 4 and Figure 6 The elastic limiting member 60 includes a connecting shell 62 and an elastic member 63. The connecting shell 62 is connected to the top of the first threaded sleeve 42. The connecting shell 62 has a sliding cavity 621 with an opening facing the limiting block 411. The limiting strip 61 is slidably connected to the sliding cavity 621 in the horizontal direction. One end of the elastic member 63 is connected to the inner bottom wall of the sliding cavity 621, and the other end is connected to the limiting strip 61, for elastically pushing the limiting strip 61.

[0036] Specifically, the connecting shell 62 is used to install the elastic element 63 and the limiting strip 61. The elastic element 63 is used to elastically push the limiting strip 61 to the top of the limiting block 411. When the elastic element 63 is in the extended state, the limiting strip 61 is located at the top of the limiting block 411. When it is necessary to disassemble the wheel 41, the limiting strip 61 is moved to compress the elastic element 63, so that the limiting strip 61 can be moved to the side of the limiting block 411, thereby disassembling the wheel 41. This facilitates the stable mounting of the wheel 41 on the outer periphery of the first threaded sleeve 42 and the disassembly of the wheel 41.

[0037] In some embodiments, see Figure 2 , Figure 4 and Figure 6 Two elastic limiting members 60 are symmetrically provided on both sides of the screw 30. The limiting strips 61 of the two elastic limiting members 60 can move towards each other to the top of the limiting block 411 or move away from each other to the sides of the limiting block 411. The extended end of the limiting strip 61 has a guide slope 611 that extends outward and downward.

[0038] Specifically, the guide slope 611 allows the limiting strip 61 to press directly down on the guide slope 611 during the installation of the wheel 41, which in turn compresses the two limiting strips 61 to move in opposite directions, thereby allowing the limiting block 411 to be inserted into the limiting groove 421, thus facilitating the installation of the wheel 41.

[0039] Furthermore, the top of the connecting shell 62 is provided with a toggle groove extending along the extension direction of the connecting shell 62, and the top of the limiting strip 61 is connected to a knob that is slidably connected to the toggle groove. The knob extends upward to the top of the toggle groove, which facilitates the toggle of the limiting strip 61.

[0040] Furthermore, two limiting grooves 421 are provided on both sides of the screw 30, and two limiting blocks 411 are provided on both sides of the screw 30. The connecting shell 62 has two adjacent sliding cavities 621, which extend to both ends of the connecting shell 62 respectively. Each sliding cavity 621 is provided with an elastic element 63 and a limiting strip 61. The two limiting strips 61 in a single connecting shell 62 are used to block the upper ports of the two limiting grooves 421 respectively.

[0041] In some embodiments, see Figures 1 to 3 and Figure 7 The valve body 10 is provided with a mounting frame 70. The top of the mounting frame 70 is provided with a mounting sleeve 71 that extends downward and is fitted around the outer periphery of the lifting rod 50. The mounting sleeve 71 is located above the screw 30. The lower end of the mounting sleeve 71 is rotatably connected to a second threaded sleeve 72 that is threaded around the outer periphery of the lifting rod 50. The screw 30 and the gate plate 20 are provided with a through cavity 80 that extends axially along the screw 30. The lifting rod 50 is slidably connected in the through cavity 80. The outer peripheral wall of the lifting rod 50 is provided with an axially extending positioning groove 52. The inner peripheral wall of the through cavity 80 is provided with a protruding positioning block 81 that slides with the positioning groove 52.

[0042] Specifically, the rotating wheel 40 is located inside the mounting frame 70 and has a certain distance between it and the inner sidewall of the mounting frame 70 to avoid mutual interference. The lifting rod 50 and the mounting sleeve 71 slide in the vertical direction. To facilitate fine adjustment of the height of the support plate 51, a second threaded sleeve 72 is threadedly connected to the lifting rod 50. The mutual limiting cooperation between the positioning block 81 and the positioning groove 52 restricts the rotation of the lifting rod 50, facilitating the adjustment of the vertical displacement of the lifting rod 50 by the second threaded sleeve 72.

[0043] In some embodiments, see Figures 1 to 4 The outer peripheral wall of the second threaded sleeve 72 is provided with a groove 721 that extends axially to the lower end of the second threaded sleeve 72 for the limiting block 411 to be engaged. The wheel 41 can move up until the limiting block 411 is engaged in the groove 721 and drive the second threaded sleeve 72 to rotate under the rotation of the wheel 41.

[0044] Specifically, when it is necessary to adjust the vertical displacement of the lifting rod 50, the wheel 41 can be moved upward to disengage the limiting block 411 from the limiting groove 421 and move upward into the slot 721. By rotating the wheel 41, the second threaded sleeve 72 can be rotated to facilitate the height adjustment of the support plate 51.

[0045] In some embodiments, see Figure 2 The outer peripheral wall of the second threaded sleeve 72 is provided with an extension groove 722 that communicates with the slot 721 and extends circumferentially. The limiting block 411 can pass through the slot 721 and enter the extension groove 722.

[0046] Specifically, the extension groove 722 is located near the axial center of the second threaded sleeve 72. The limiting block 411 first enters the slot 721, then continues to move upward into the extension groove 722. Finally, the circumferentially rotated wheel 41 slightly, and then the wheel 41 can be released by both hands. With the limiting block 411 and the inner wall of the extension groove 722 mutually limiting each other, the wheel 41 is stably fitted on the outer circumference of the second threaded sleeve 72, preventing the wheel 41 from falling off. At the same time, the limiting block 411 and the inner wall of the limiting groove 421 can drive the second threaded sleeve 72 to rotate, improving practicality.

[0047] In some embodiments, see Figure 1 and Figure 2 The lower end of the second threaded sleeve 72 is provided with an elastic limiting member 60.

[0048] Specifically, the elastic limiting member 60 is located below the slot 721. After the limiting block 411 enters the slot 721, the limiting member 60 restricts the limiting block 411 from disengaging from the slot 721, thus preventing the wheel 41 from falling off and improving practicality.

[0049] In some embodiments, see Figure 1 , Figure 3 and Figure 7 A sealing ring 53 is fixedly sleeved on the outer peripheral wall of the lifting rod 50 for contacting and engaging with the inner peripheral wall of the through cavity 80.

[0050] Specifically, the sealing ring 53 is fixedly connected to the lifting rod 50, and the outer peripheral wall of the sealing ring 53 contacts and fits with the inner peripheral wall of the through cavity 80 to seal the gap between the lifting rod 50 and the through cavity 80, thereby improving the airtightness of the lifting rod 50 and preventing the medium from flowing out from the gap between the lifting rod 50 and the through cavity 80, thus improving practicality.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A knife gate valve, characterized in that, The knife gate valve includes: The valve body has a horizontally penetrating passage cavity for the medium to pass through. A gate plate for blocking the passage cavity is slidably connected to the valve body in the vertical direction. The inner peripheral wall of the passage cavity is provided with a receiving groove for accommodating the side edge of the gate plate. The bottom wall of the receiving groove is provided with an upward-opening embedding groove. A screw is connected to the top of the gate and extends upward to the top of the valve body; A rotary wheel is rotatably connected to the top of the valve body. A screw coaxially passes through the rotary wheel and is threadedly engaged with it. The rotary wheel can drive the screw to rise and fall, causing the gate to block or avoid the passage cavity. A lifting rod is provided along the axial direction of the screw and the gate plate and is slidably connected to the screw and the gate plate. The lower end of the lifting rod is connected to a support plate for embedding in the embedding groove to support impurities. When the gate is in the open state, the support plate can be moved upward to above the receiving groove by the lifting rod so that the medium can flush the support plate; The impeller includes: A first threaded sleeve is threaded onto the outer periphery of the screw and rotatably connected to the top of the valve body. An axially extending limiting groove is formed on the outer peripheral wall of the first threaded sleeve. A wheel is fitted around the outer periphery of the first threaded sleeve, and a limiting block with a protrusion on the inner peripheral wall of the wheel and slidingly engaging with the limiting groove is provided. The top of the first threaded sleeve is provided with an elastic limiting member, and a limiting strip that can move above the limiting block to lock the limiting block in the axial upward position of the first threaded sleeve is slidably connected to the elastic limiting member. The valve body is provided with a mounting frame. The top of the mounting frame is provided with a mounting sleeve that extends downward and is fitted around the outer periphery of the lifting rod. The mounting sleeve is located above the screw. The lower end of the mounting sleeve is rotatably connected to a second threaded sleeve that is threaded around the outer periphery of the lifting rod. The screw and the gate plate are provided with a through cavity that extends along the axial direction of the screw. The lifting rod is slidably connected in the through cavity. The outer peripheral wall of the lifting rod is provided with an axially extending positioning groove. The inner peripheral wall of the through cavity is provided with a protruding positioning block that slides with the positioning groove. The outer peripheral wall of the second threaded sleeve is provided with a groove that extends axially to the lower end of the second threaded sleeve for the limiting block to be engaged. The wheel can move upward until the limiting block is engaged in the groove and drive the second threaded sleeve to rotate under the rotation of the wheel.

2. The knife gate valve as described in claim 1, characterized in that, The elastic limiting member includes: A connecting shell, connected to the top of the first threaded sleeve, the connecting shell having a sliding cavity with an opening facing the limiting block, the limiting strip being slidably connected to the sliding cavity in a horizontal direction; and An elastic element, with one end connected to the inner bottom wall of the sliding cavity and the other end connected to the limiting strip, is used to elastically push the limiting strip.

3. The knife gate valve as described in claim 2, characterized in that, Two elastic limiting members are symmetrically provided on both sides of the screw. The limiting strips of the two elastic limiting members can move towards each other to the top of the limiting block or move away from each other to the sides of the limiting block. The extended ends of the limiting strips have guide slopes that extend outward and downward.

4. The knife gate valve as described in claim 1, characterized in that, The outer peripheral wall of the second threaded sleeve is provided with an extension groove that communicates with the slot and extends circumferentially, and the limiting block can pass through the slot and enter the extension groove.

5. The knife gate valve as described in claim 1, characterized in that, The lower end of the second threaded sleeve is provided with the elastic limiting member.

6. The knife gate valve as described in claim 1, characterized in that, A sealing ring is fixedly sleeved on the outer peripheral wall of the lifting rod for contacting and engaging with the inner peripheral wall of the through cavity.

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