Knife gate valve

Abstract

The utility model relates to the technical field of gate valves, and provides a knife gate valve aiming at the problems that an existing knife gate valve is low in filtering efficiency and tedious in maintenance work, the knife gate valve comprises a valve main body and a filtering mechanism, and the valve main body comprises a valve body and a knife switch plate connected with the valve body in a sliding mode; the filtering mechanism comprises a fixing ring detachably connected to the end of the valve body and a plurality of filtering nets movably connected with the fixing ring. Firstly, impurities can be effectively prevented from entering the valve main body through efficient filtration of a plurality of filter screens of the filter mechanism. A plurality of arc-shaped slots are formed in the upper half part of the fixing ring along the end part, so that the plurality of filter screens can enter and exit from the fixing ring respectively; and the filtering mechanism further comprises an arc-shaped sealing cover which is clamped with the upper half part of the fixing ring and is used for sealing the plurality of arc-shaped slots. Due to the arc-shaped sealing cover, leakage is avoided when the filter screen is accommodated in the fixing ring for working; the arc-shaped sealing cover is detached, and the filter screen can be conveniently taken out from the arc-shaped open groove to be replaced, so that the filter efficiency is favorably improved, and the maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gate valve, specifically, relates to a knife gate valve. BACKGROUND

[0002] The knife gate valve is a commonly used industrial valve, and the flow of fluid is controlled by the up-down moving knife gate plate. When the knife gate plate is completely inserted into the valve body, the fluid is completely cut off; when the knife gate plate is pulled out, the fluid flows smoothly. The common knife gate valve does not have a filtering function, and impurities and dirt are easily accumulated on the surface of the knife gate plate after long-term use, which will affect the subsequent use effect of the knife gate valve if not cleaned in time.

[0003] The patent with the publication number CN221237204U provides a knife gate valve convenient to disassemble, which comprises a valve seat, a valve body, a bracket and a pneumatic cylinder. The bottom of the valve seat is integrally provided with a pipeline, and flanges are welded to the left and right ends of the pipeline. The surface of the flange is detachably provided with a filter screen through positioning screws A. Although this knife gate valve solves the defects of not having filtering effect and being inconvenient to disassemble during use, it can be easily replaced later, avoids causing the whole to be scrapped when damaged, reduces maintenance costs and costs, and the filter screen can filter the liquid entering the valve body, avoid impurities and dirt accumulated in the valve cavity to reduce the sealing performance of the valve body, and the filter screen can also be detached to provide convenience for later cleaning and replacement. However, the pore size of the filter screen may affect the filtering efficiency. If the pore size is too large, it may not effectively block all impurities, and if the pore size is too small, it may cause pressure loss of the fluid passing through, and the disassembly process is complicated, which affects the convenience of maintenance work. The knife gate valve still has the problems of low filtering efficiency and complicated maintenance work.

[0004] Therefore, it is urgent to provide a knife gate valve that can efficiently filter and is convenient to maintain. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problems of low filtering efficiency and complicated maintenance work of the existing knife gate valve. The utility model provides a knife gate valve, which can realize efficient filtering and is convenient to maintain.

[0006] The utility model discloses a knife gate valve through following technical scheme realizes: a knife gate valve, including valve main part and filter mechanism, the valve main part includes valve body and knife gate board, the knife gate board with the valve body sliding connection, the filter mechanism includes fixed ring and a plurality of filter screen, the fixed ring is detachably connected in the end of valve body, a plurality of filter screen all with fixed ring swing joint, the upper half of fixed ring is provided with a plurality of arc grooves along the end portion side by side, a plurality of arc grooves respectively for a plurality of filter screen in and out fixed ring, the filter mechanism still includes arc seal cover, the arc seal cover with the upper half of fixed ring is detachably connected, and the arc seal cover is used for sealing a plurality of arc grooves.

[0007] Preferably, the number of filter screens and arc grooves is two, and the mesh of the filter screen away from the valve body is larger than that of the filter screen close to the valve body.

[0008] Preferably, the inner top of the arc-shaped sealing cover is provided with two arc-shaped protrusions, and the two arc-shaped protrusions are respectively embedded in the two arc-shaped grooves.

[0009] Preferably, the outer top of the arc-shaped sealing cover is detachably connected with a pull ring.

[0010] Preferably, one end of the valve body facing the fixed ring is provided with a plurality of positioning bolts, and one end of the fixed ring facing the valve body is provided with a plurality of bolt holes.

[0011] Preferably, the valve main body further comprises a box body, the bottom of the box body and the upper half of the valve body are detachably connected, the outer top of the box body is provided with a motor, and the top of the knife gate board is detachably connected with the motor through a valve rod; one end of the valve rod is detachably connected with the top of the knife gate board, and the other end of the valve rod penetrates out of the top of the box body and is detachably connected with the output shaft of the motor; the bottom of the box body and the top of the valve body are both provided with a through groove, and the through groove is used for the knife gate board.

[0012] Preferably, one end of the valve body facing the fixed ring is provided with a plurality of positioning bolts, and one end of the fixed ring facing the valve body is provided with a plurality of bolt holes.

[0013] Preferably, one side of the positioning plate is detachably connected with the top of the knife gate board, the other side of the positioning plate is detachably connected with one end of the valve rod facing the knife gate board, both ends of the positioning plate are provided with a sliding block, and a pair of sliding blocks are respectively embedded in a pair of sliding grooves.

[0014] Preferably, one side of the positioning plate is detachably connected with the top of the knife gate board, the other side of the positioning plate is detachably connected with one end of the valve rod facing the knife gate board, both ends of the positioning plate are provided with a sliding block, and a pair of sliding blocks are respectively embedded in a pair of sliding grooves.

[0015] Preferably, the inner bottom of the fixed ring is provided with a plurality of arc-shaped grooves, and the bottoms of the plurality of filter screens are respectively embedded in the plurality of arc-shaped grooves.

[0016] The technical scheme of the utility model has the following beneficial effects:

[0017] (1) First, the filter screen of the filtering mechanism is filtered, and the plurality of filter screens are efficiently filtered, which can effectively prevent impurities from entering the valve body, reduce the maintenance frequency of the valve body, and prolong the service life of the valve body. When the filtering mechanism is working, the filter screen is contained in the fixed ring, and the arc-shaped sealing cover is designed to seal the arc-shaped groove, so that leakage does not occur during use. By disassembling the arc-shaped sealing cover, the filter screen can be taken out from the arc-shaped groove of the fixed ring for replacement, so that the filter screen with a suitable mesh size can be conveniently selected, the filtering efficiency is improved, and the filter screen can be conveniently cleaned and maintained.

[0018] (2) The filter screen with a larger mesh size is used for rough filtering, and the filter screen with a smaller mesh size is used for fine filtering, so that the filtering efficiency can be effectively improved.

[0019] (3) By clamping a pair of arc-shaped protrusions in a pair of arc-shaped grooves, the arc-shaped sealing cover and the upper half of the fixed ring can be tightly connected, so that the filter screen can be stably arranged in the interior of the fixed ring, and the filtering mechanism can be in a sealed state for filtering work; the arc-shaped sealing cover can be conveniently disassembled by pulling the pull ring.

[0020] (4) The motor drives the valve rod to move up and down, and then drives the knife gate to move up and down, so that the knife gate moves upward through the through groove to be away from the valve body to open the fluid passage, or the knife gate moves downward through the through groove to completely enter the valve body to close the fluid passage. The up-and-down movement of the knife gate is more stable through the arrangement of the positioning plate, the sliding block and the sliding groove, and the stability and reliability of the system are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a structure schematic view of the knife gate valve in the utility model embodiment 1.

[0022] Fig. 2 It is a structure schematic view of the filtering mechanism in the utility model embodiment 1 (when the arc-shaped sealing cover is not installed).

[0023] Fig. 3 It is a structure schematic view of the arc-shaped sealing cover in the utility model embodiment 1 (when the sealing plate is disassembled for maintenance).

[0024] Fig. 4 It is a structure schematic view of the valve body in the utility model embodiment 1.

[0025] Reference numerals: 1-Valve body, 11-Valve body, 11a-Placement groove, 12-Knife gate, 13-Box, 13a-Through groove, 13b-Slide groove, 14-Motor, 15-Valve stem, 16-Positioning plate, 17-Slider, 18-Sealing plate, 19-Positioning bolt, 2-Filter mechanism, 21-Fixing ring, 21a-Arc-shaped slot, 21b-Bolt hole, 22-Filter screen, 23-Arc-shaped sealing cover, 24-Arc-shaped protrusion, 25-Pull ring. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown herein can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] Example 1

[0030] like Figs. 1 to 4 As shown, this embodiment provides a knife gate valve, including a valve body 1 and a filtering mechanism 2. The valve body 1 includes a valve body 11 and a knife gate plate 12 slidably connected to the valve body 11. The filtering mechanism 2 includes a fixing ring 21 and multiple filter screens 22. The fixing ring 21 is screwed to the end of the valve body 11, and the multiple filter screens 22 are movably connected to the fixing ring 21. Multiple arc-shaped slots 21a are opened side by side along the end of the upper half of the fixing ring 21, which allow the multiple filter screens 22 to enter and exit the fixing ring 21 respectively. The filtering mechanism 2 also includes an arc-shaped sealing cover 23 that is engaged with the upper half of the fixing ring 21. The arc-shaped sealing cover 23 is used to seal the multiple arc-shaped slots 21a.

[0031] The plurality of filter screens 22 are high-efficiency filters, which can effectively prevent impurities from entering the valve body 1, reduce the maintenance frequency of the valve body 1, and prolong the service life of the valve body 1. When the filter mechanism 2 is working, the filter screen 22 is contained in the fixed ring 21, and the arc-shaped sealing cover 23 is designed to seal the arc-shaped slot 21a, so that leakage does not occur during use. By detaching the arc-shaped sealing cover 23, the filter screen 22 can be easily taken out of the arc-shaped slot 21a of the fixed ring 21 for replacement. This facilitates the selection of filter screens 22 with appropriate mesh sizes, improves the filtering efficiency, and facilitates the cleaning and maintenance of the filter screen 22. To improve the efficiency of replacing the filter screen 22, a suitable tool such as tweezers can be used to remove the filter screen 22.

[0032] In this embodiment, the number of filter screens 22 and arc-shaped slots 21a is two, and the mesh size of the filter screen 22 away from the valve body 11 is larger than that of the filter screen 22 close to the valve body 11. The filter screen 22 away from the valve body 11 is provided with a larger mesh size for coarse filtration, and the filter screen 22 close to the valve body 11 is provided with a smaller mesh size for fine filtration, which can effectively improve the filtering efficiency.

[0033] In this embodiment, the two arc-shaped protrusions 24 provided on the inner top of the arc-shaped sealing cover 23 are respectively embedded in the two arc-shaped slots 21a. By clamping a pair of arc-shaped protrusions 24 in a pair of arc-shaped slots 21a, the arc-shaped sealing cover 23 can be tightly connected with the upper half of the fixed ring 21, and the filter screen 22 can be stably arranged in the interior of the fixed ring 21, so that the filter mechanism 2 can be in a sealed state for filtering work.

[0034] In this embodiment, the outer top of the arc-shaped sealing cover 23 is welded with a pull ring 25. By pulling the pull ring 25, the arc-shaped sealing cover 23 can be easily detached.

[0035] In this embodiment, the valve body 11 is provided with a plurality of positioning screws 19 at one end facing the fixed ring 21, and the fixed ring 21 is provided with a plurality of screw holes 21b at one end facing the valve body 11. The plurality of positioning screws 19 are uniformly distributed on the valve body 11, and the design of the positioning screw 19 and the screw hole 21b enables the fixed ring 21 and the valve body 11 to be accurately aligned during installation, saving installation time and making the installation stable and firm. At the same time, it can be easily and quickly detached.

[0036] In the embodiment, the valve body 1 further comprises a box 13, the bottom of the box 13 is welded with the upper half of the valve body 11, the outer top of the box 13 is provided with a motor 14, the top of the knife gate plate 12 is connected with the motor 14 through a valve rod 15, one end of the valve rod 15 is screwed with the top of the knife gate plate 12, the other end of the valve rod 15 passes through the top of the box 13 and is connected with the output shaft of the motor 14; the bottom of the box 13 and the top of the valve body 11 are both provided with a through slot 13a, the through slot 13a is for the knife gate plate 12 to pass through. The position where the valve rod 15 contacts with the top of the box 13 is provided with a sealing ring (not shown).

[0037] The motor 14 drives the valve rod 15 to move up and down, and then drives the knife gate plate 12 to move up and down, so that the knife gate plate 12 passes through the through slot 13a to move away from the valve body 11 to open the fluid passage, or the knife gate plate 12 passes through the through slot 13a to completely enter the valve body 11 to close the fluid passage.

[0038] In the embodiment, one sliding groove 13b is formed in each of the two inner side walls of the box 13, the knife gate plate 12 is provided with a positioning plate 16, one side of the positioning plate 16 is welded with the top of the knife gate plate 12, the other side of the positioning plate 16 is screwed with one end of the valve rod 15 which faces the knife gate plate 12, and a pair of sliding blocks 17 are arranged at the two ends of the positioning plate 16 and respectively embedded in the pair of sliding grooves 13b.

[0039] The stable movement of the sliding blocks 17 in the sliding grooves 13b is conducive to the stable up and down movement of the positioning plate 16 and the knife gate plate 12 connected with the positioning plate 16 when the motor 14 drives the valve rod 15 to move up and down, thereby improving the stability and reliability of the system.

[0040] In the embodiment, the sealing plate 18 is screwed at the opening formed in the side of the box 13 close to the filter screen 22, the cross-sectional area of the sealing plate 18 is larger than the opening, and the sealing plate 18 is used to seal the opening. An annular groove is formed in the circumferential edge of the side of the sealing plate 18 facing the box, and a sealing ring (not shown) is embedded in the annular groove, which can effectively seal. The sealing plate 18 of the box 13 can be removed for cleaning and maintenance, which is convenient for maintenance.

[0041] In the embodiment, the inner bottom of the valve body 11 is provided with a placing groove 11a, and the bottom of the knife gate plate 12 is embedded in the placing groove 11a. The placing groove 11a is beneficial to stably placing the knife gate plate 12 in the valve body 11.

[0042] In the embodiment, the inner bottom of the fixed ring 21 is provided with a plurality of arc-shaped grooves, and the bottoms of the plurality of filter screens 22 are respectively embedded in the plurality of arc-shaped grooves. The arc-shaped grooves (not shown) are beneficial to stably placing the filter screens 22 in the fixed ring 21.

[0043] In the embodiment, the end of the valve body 11 away from the fixed ring 21 is connected with the external pipeline through a flange (not shown), and the end of the fixed ring 21 away from the valve body 11 is connected with the external pipeline through a flange (not shown).

[0044] The preferred embodiments of the utility model are merely used for limiting the utility model, and the utility model can be changed in various ways for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A knife gate valve characterized by, The utility model provides a valve body (1) and filter mechanism (2) including, the valve body (1) includes valve body (11) and knife gate (12), knife gate (12) is connected with valve body (11) slidingly, The filter mechanism (2) includes a fixed ring (21) and a plurality of filter screens (22), the fixed ring (21) is detachably connected to the end of the valve body (11), and a plurality of filter screens (22) are movably connected with the fixed ring (21); The upper half of the fixed ring (21) is provided with a plurality of arc-shaped slots (21a) along the end portion, and the plurality of arc-shaped slots (21a) are respectively used for the plurality of filter screens (22) to enter and exit the fixed ring (21), and the filter mechanism (2) further includes an arc-shaped sealing cover (23), the arc-shaped sealing cover (23) is detachably connected with the upper half of the fixed ring (21), and the arc-shaped sealing cover (23) is used for sealing the plurality of arc-shaped slots (21a).

2. The knife gate valve of claim 1, wherein, The number of the filter screens (22) and the arc-shaped slots (21a) is two, and the mesh of the filter screen (22) away from the valve body (11) is greater than that of the filter screen (22) close to the valve body (11).

3. The knife gate valve of claim 2, wherein, The inner top of the arc-shaped sealing cover (23) is provided with two arc-shaped protrusions (24), and the two arc-shaped protrusions (24) are respectively embedded in the two arc-shaped slots (21a).

4. The knife gate valve of claim 1, wherein, The outer top of the arc-shaped sealing cover (23) is detachably connected with a pull ring (25).

5. The knife gate valve of claim 1, wherein, One end of the valve body (11) facing the fixed ring (21) is provided with a plurality of positioning bolts (19), and the end of the fixed ring (21) facing the valve body (11) is provided with a plurality of bolt holes (21b).

6. The knife gate valve according to any one of claims 1 to 5, characterized in that The valve body (1) further includes a box body (13), the bottom of the box body (13) is detachably connected with the upper half of the valve body (11), the outer top of the box body (13) is provided with a motor (14), and the top of the knife gate (12) is detachably connected with the motor (14) through a valve rod (15); One end of the valve rod (15) is detachably connected with the top of the knife gate (12), and the other end of the valve rod (15) penetrates out of the top of the box body (13) and is detachably connected with the output shaft of the motor (14); The bottom of the box body (13) and the top of the valve body (11) are provided with a through groove (13a), and the through groove (13a) is used for the knife gate (12) to pass through.

7. The knife gate valve of claim 6, wherein, The two inner side walls of the box body (13) are provided with a sliding groove (13b), the knife gate (12) is provided with a positioning plate (16), one side of the positioning plate (16) is detachably connected with the top of the knife gate (12), the other side of the positioning plate (16) is detachably connected with one end of the valve rod (15) facing the knife gate (12), and the two ends of the positioning plate (16) are provided with a sliding block (17), and a pair of sliding blocks (17) are respectively embedded in a pair of sliding grooves (13b).

8. The knife gate valve of claim 6, wherein, The box (13) is provided with an opening on one side close to the filter screen (22), and the box (13) is detachably connected with a sealing plate (18) used for sealing the opening.

9. The knife gate valve of claim 1, wherein, The inner bottom of the valve body (11) is provided with a placing groove (11a), and the bottom of the knife gate plate (12) is embedded in the placing groove (11a).

10. The knife gate valve of claim 1, wherein, The inner bottom of the fixing ring (21) is provided with a plurality of arc-shaped grooves, and the bottoms of a plurality of filter screens (22) are embedded in the arc-shaped grooves respectively.

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