Butterfly valve with filter screen convenient to disassemble and assemble

Abstract

According to the technical scheme, the butterfly valve is characterized by comprising a valve body, a fixing ring and a filter screen plate, a first annular groove and a second annular groove which are coaxially arranged are formed in one end of the valve body, and the inner diameter of the first annular groove is larger than that of the second annular groove; the fixing ring comprises a positioning ring positioned in the first ring groove and a connecting ring capable of extending into the second ring groove, the filter screen plate can be contained in the second ring groove, and a plurality of threaded holes circumferentially distributed around the axis of the connecting ring are formed in the end face, facing the filter screen plate, of the connecting ring. Counterbores in one-to-one correspondence with the threaded holes and a plurality of connecting screws with nuts capable of being contained in the large ends of the counterbores are arranged on the filter screen plate, and one ends of the connecting screws penetrate through the corresponding counterbores and are screwed into the threaded holes, so that the filter screen plate is positioned on the end face of the fixing ring; the problems that in the prior art, a filter screen plate is difficult to disassemble and cleaning operation is complex are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, and more particularly to a butterfly valve which is convenient for disassembling and assembling a filter screen. Background Art

[0002] A butterfly valve, also known as a flap valve, is a regulating valve with a simple structure. A butterfly valve that can be used for on-off control of low-pressure pipeline media refers to a valve whose closing part (valve disc or butterfly plate) is a disc, which rotates around the valve shaft to achieve opening and closing. The general three-eccentric butterfly valve does not have a removable rust-proof built-in filter screen inside. During long-term use, rusted fragments can easily clog the inside of the three-eccentric butterfly valve, causing blockage of the pipeline and affecting normal regulation and discharge use. An existing Chinese patent with application number 2020215110664 discloses a three-eccentric butterfly valve with a removable rust-proof built-in filter screen, which has a first annular groove and a second annular groove coaxially arranged in the valve body, and a filter plate is installed in the second annular groove. The outer diameter of the filter plate matches the inner diameter of the second annular groove. A fixing ring that limits the filter plate to the valve body is detachably connected in the first annular groove. This design solves the problem that the filter screen in the prior art cannot be replaced, but there are still defects. In the process of removing the filter screen alone, there is no specific force point on the filter screen. If the filter screen is pulled, the filter screen will be The overall movement of the screen will cause uneven force due to the deformation of the filter, and the screen may easily tilt, causing the edge of the screen to collide or hit the inner wall of the valve body, resulting in difficulty in removing the screen and wear of the inner wall of the valve body. At the same time, the deformation of the filter will inevitably cause impurities on the filter to fall off and stick to the inner wall of the valve body or the second ring groove, making it difficult to clean. Furthermore, if it is found that the second ring groove is not cleaned in time or other related operations are required during the installation of the filter plate, the filter plate needs to be removed in time. If pulling force is directly applied to the filter, the filter will be deformed and the filtration efficiency will be affected. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model aims to provide a butterfly valve which is easy to disassemble and assemble the filter screen and has a stable filtering effect.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a butterfly valve that is easy to disassemble and assemble a filter screen, comprising a valve body, a fixing ring and a filter screen plate, wherein a first annular groove and a second annular groove are coaxially arranged at one end of the valve body, the inner diameter of the first annular groove is larger than that of the second annular groove, the fixing ring comprises a positioning ring positioned in the first annular groove and a connecting ring that can extend into the second annular groove, the filter screen plate can be accommodated in the second annular groove, a plurality of threaded holes distributed circumferentially around the axis of the connecting ring are arranged on the end surface of the connecting ring facing the filter screen plate, countersunk holes corresponding to the plurality of threaded holes and a plurality of connecting screws that can be accommodated in the large ends of the countersunk holes are arranged on the filter screen plate, and the filter screen plate is positioned on the end surface of the fixing ring by passing one end of the plurality of connecting screws through the corresponding countersunk holes and being screwed into the threaded holes.

[0005] As a further improvement of the present invention, the end surface of the connecting ring facing the filter plate is beveled to form a beveled annular surface, the beveled annular surface is coaxial with the center line of the connecting ring, the inner cavity enclosed by the beveled annular surface is truncated cone-shaped with the large end facing the filter plate, and a raised ring that can fit with the beveled annular surface is provided on the end surface of the filter plate facing the connecting ring.

[0006] As a further improvement of the utility model, the beveled annular surface and the raised ring are respectively provided with a rotation limiting groove and a rotation limiting strip which can be plugged into each other, and the length direction of the rotation limiting groove and the rotation limiting strip is the same as the diameter direction of the component.

[0007] As a further improvement of the present invention, a filling sealing ring capable of covering a plurality of countersunk holes is provided between the bottom of the second annular groove and the filter plate.

[0008] The beneficial effects of the utility model are as follows: by detachably connecting the filter plate and the fixing ring together, the filter plate can be installed and removed relative to the valve body together with the fixing ring. Compared with the prior art design in which the filter plate and the fixing ring are independent of each other, such design can connect the filter plate and the fixing ring as one, making it convenient for the filter plate to be installed and removed along with the fixing ring, thus making up for the defects of the prior art filter plate that is difficult to disassemble and easy to get stuck. At the same time, it ensures that the filter structure of the filter plate is stable, the filtering effect is stable, and impurities are prevented from falling into the second ring groove or the first ring groove during maintenance; the design of the countersunk hole can ensure that the filter plate can fit tightly against the bottom of the second ring groove to form a hard seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0011] Figure 3This is a three-dimensional diagram of the assembly of the fixing ring and the filter plate in the utility model;

[0012] Figure 4 for Figure 3 Exploded diagram of

[0013] Figure 5 for Figure 4 Another perspective of the stereogram.

[0014] Figure numerals: 1. valve body; 2. fixing ring; 21. positioning ring; 22. connecting ring; 23. threaded hole; 24. beveled annular surface; 25. rotation limiting groove; 3. filter plate; 31. countersunk hole; 32. raised ring; 33. rotation limiting strip; 4. first annular groove; 5. second annular groove; 6. connecting screw; 7. filling sealing ring. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same components are indicated by the same reference numerals.

[0016] Reference Figures 1 to 5 As shown, a butterfly valve for easy disassembly and assembly of a filter screen in this embodiment comprises a valve body 1, a fixing ring 2 and a filter screen plate 3. A first annular groove 4 and a second annular groove 5 are coaxially arranged at one end of the valve body 1. The inner diameter of the first annular groove 4 is larger than that of the second annular groove 5. The fixing ring 2 comprises a positioning ring 21 positioned in the first annular groove 4 and a connecting ring 22 capable of extending into the second annular groove 5. The filter screen plate 3 can be accommodated in the second annular groove 5.

[0017] Based on the above-mentioned prior art, three threaded holes 23 are uniformly distributed around the axis of the connecting ring 22 on the end face away from the positioning ring 21, and the filter plate 3 includes a hard ring body and a filter screen located in the inner cavity of the hard ring body. Countersunk holes 31 corresponding to the three threaded holes 23 are opened on the hard ring body, and the inner diameter of the small end of the countersunk hole 31 is greater than or equal to the inner diameter of the threaded hole 23. The outer diameter of the filter plate 3 is the same as the outer diameter of the connecting ring 22. The three connecting screws 6 can be flat screws or cross screws. During the assembly process, the positioning ring 21 is laid flat with the connecting ring 22 facing upwards, and then the filter plate 3 is laid flat on the connecting ring 22, and then the peripheral wall of the filter plate 3 is kept flush with the peripheral wall of the connecting ring 22 and the filter plate 3 is rotated relative to the connecting ring 22 so that the small end parts of the three countersunk holes 31 are connected with the three threaded holes 23 respectively, and then three connecting screws 6 are successively passed through the corresponding countersunk holes 31 and screwed into the corresponding threaded holes 23 until the nut parts of the three connecting screws 6 are all located in the large end inner cavity of the countersunk holes 31, and finally the fixing ring 2 with the filter plate 3 is installed into the valve body 1;

[0018] Compared with the prior art design in which the filter plate 3 and the fixing ring 2 are independent of each other, such a design can connect the filter plate 3 and the fixing ring 2 as a whole, making it easy for the filter plate 3 to be installed and disassembled along with the fixing ring 2, thereby making up for the defects of the prior art filter plate 3 that is difficult to disassemble and succumb to jamming. At the same time, it also ensures that the filter structure of the filter plate 3 is stable, the filtering effect is stable, and impurities are prevented from falling into the second ring groove 5 or the first ring groove 4 during maintenance; the design of the countersunk hole 31 can ensure that the filter plate 3 can be tightly attached to the bottom of the second ring groove 5 to form a hard seal.

[0019] As a specific implementation method of the improvement, refer to Figure 1-2 , Figure 4 and Figure 5 As shown, the surface of the connecting ring 22 with the threaded hole 23 is further processed, and the outer edge of the connecting ring 22 is beveled toward the inner edge to form a beveled ring surface 24, the beveled ring surface 24 is coaxial with the center line of the connecting ring 22, the inner cavity surrounded by the beveled ring surface 24 is in a truncated cone shape with the large end facing the filter plate 3, and the end surface of the filter plate 3 facing the connecting ring 22 is provided with a raised ring 32 that can fit with the beveled ring surface 24. When the positioning ring 21 is placed flat and the connecting ring 22 is facing upward, the raised ring 32 is facing the beveled ring surface 24 and the filter plate 3 is placed on the connecting ring 22. As the outer wall of the raised ring 32 slides relative to the beveled ring surface 24 until the raised ring 32 stops moving relative to the beveled ring surface 24, the raised ring 32 and the filter plate 3 are in contact. The beveled annular surface 24 is fully fitted to form a hard seal, and at the same time, the filter plate 3 is automatically adjusted to a coaxial position with the connecting ring 22, and the peripheral wall of the filter plate 3 is flush with the peripheral wall of the connecting ring 22. Compared with the previous embodiment in which the filter plate 3 is manually translated relative to the connecting ring 22, the coaxial design can simplify the calibration steps of the filter plate 3 and the connecting ring 22 and improve the assembly efficiency; at the same time, the mutual insertion of the raised ring 32 and the beveled annular surface 24 can increase the contact area, indirectly improve the sealing stability and the connection stability of the filter plate 3 and the connecting ring 22, and can also reduce the shear force on the connecting screw 6 in the use state, thereby ensuring the structural stability of the connecting screw 6 and facilitating the subsequent smooth removal of the connecting screw 6.

[0020] As a specific implementation method of the improvement, refer to Figure 4 and Figure 5As shown, the beveled annular surface 24 and the raised ring 32 are respectively provided with a limiting groove 25 and a limiting strip 33 which can be plugged into each other. The length directions of the limiting groove 25 and the limiting strip 33 are the same as the diameter direction of the components. By first correspondingly plugging the limiting strip 33 and the limiting groove 25, and then as the raised ring 32 moves into position relative to the beveled annular surface 24, the countersunk hole 31 is correspondingly connected to the threaded hole 23. Such a design can eliminate the need for the first embodiment to manually rotate the filter plate 3, further improve the assembly efficiency, and prevent the subsequent rotation of the filter plate 3 relative to the connecting ring 22, which makes it difficult to install the connecting screw 6. At the same time, after the connecting screw 6 is installed in place, it can also avoid the shear force generated by the rotation from damaging the connecting screw 6.

[0021] As a specific implementation method of the improvement, refer to Figure 1 and Figure 2 As shown, a filling sealing ring 7 capable of covering a plurality of countersunk holes 31 is provided between the bottom of the second annular groove 5 and the filter plate 3. The filling sealing ring 7 has the ability to deform slightly. Such a design can make up for the defect of a gap between the filter plate 3 and the second annular groove 5 caused by the processing size, thereby preventing the medium from generating thrust on the filter plate 3 and affecting the connection stability between the fixing ring 2 and the valve body 1; the design that the filling sealing ring 7 can cover the countersunk holes 31 can prevent the medium or impurities from entering the countersunk holes 31 and affecting the structure of the connecting screws 6, thereby ensuring that after the fixing ring 2 is removed, the maintenance personnel can use a screwdriver to smoothly unscrew the connecting screws 6.

[0022] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A butterfly valve for facilitating the assembly and disassembly of a filter screen, comprising a valve body (1), a fixing ring (2) and a filter screen plate (3), wherein one end of the valve body (1) is provided with a first annular groove (4) and a second annular groove (5) which are coaxially arranged, wherein the inner diameter of the first annular groove (4) is larger than that of the second annular groove (5), the fixing ring (2) comprises a positioning ring (21) positioned in the first annular groove (4) and a connecting ring (22) which can extend into the second annular groove (5), and the filter screen plate (3) can be accommodated in the second annular groove (5), characterized in that: The end surface of the connecting ring (22) facing the filter plate (3) is provided with a plurality of threaded holes (23) distributed in a circumferential manner around the axis of the connecting ring (22); the filter plate (3) is provided with countersunk holes (31) corresponding to the plurality of threaded holes (23) one by one and a plurality of connecting screws (6) whose nuts can be accommodated in the large ends of the countersunk holes (31); the filter plate (3) is positioned on the end surface of the fixing ring (2) by passing one end of the plurality of connecting screws (6) through the corresponding countersunk holes (31) and being screwed into the threaded holes (23).

2. A butterfly valve for easy assembly and disassembly of a filter screen according to claim 1, characterized in that: The end surface of the connecting ring (22) facing the filter plate (3) is beveled to form a beveled annular surface (24); the beveled annular surface (24) is coaxial with the center line of the connecting ring (22); the inner cavity enclosed by the beveled annular surface (24) is truncated and has a large end facing the filter plate (3); and a raised ring (32) capable of fitting with the beveled annular surface (24) is provided on the end surface of the filter plate (3) facing the connecting ring (22).

3. A butterfly valve for easy assembly and disassembly of a filter screen according to claim 2, characterized in that: The chamfered annular surface (24) and the raised ring (32) are respectively provided with a rotation limiting groove (25) and a rotation limiting strip (33) which can be plugged into each other, and the length direction of the rotation limiting groove (25) and the rotation limiting strip (33) are both the same as the diameter direction of the components.

4. A butterfly valve for easy assembly and disassembly of a filter screen according to claim 1, 2 or 3, characterized in that: A filling sealing ring (7) capable of covering a plurality of countersunk holes (31) is provided between the bottom of the second annular groove (5) and the filter plate (3).

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