Assembly tool for valve seat of small-caliber gate valve

Abstract

The utility model relates to the technical field of valves, in particular to a small-caliber gate valve seat assembly tool. The tool comprises a threaded sleeve provided with a through hole, the threaded sleeve is in threaded connection with a thrust nut provided with a through hole, and the through hole of the threaded sleeve, the through hole of the thrust nut and a valve body channel form a first channel; at least one pull rod is arranged in the first channel; a supporting block is arranged between the pull rod and the first channel; the face, opposite to the first channel and close to the valve seat, of the pull rod is provided with a first convex step, and after the supporting block pushes the pull rod, the first convex step is matched with a first concave step arranged on the inner side of the valve seat to form limiting. The face, opposite to the first channel and close to the thrust nut, of the pull rod is provided with a second convex step, and the second convex step is matched with the end, away from the threaded sleeve, of the thrust nut to form limiting. The thrust nut moves in the direction away from the valve seats, so that the first convex steps push the valve seats to compress the valve seat springs, the distance between the valve seats is increased, and the flashboard is assembled.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an assembly tool for a valve seat of a small-caliber gate valve. Background Art

[0002] During the assembly of top-mounted valves, after the valve seat is installed into the valve body cavity, it must be effectively secured through external force through the valve body passageway, allowing the valve seat to move toward the valve body and effectively pre-compressing the valve seat spring to create sufficient assembly clearance for the ball, ensuring proper installation of the valve seat and ball. Due to the small diameter of the valve body passageway in small-diameter gate valves, the available space within the valve body passageway is limited. The pull rod that transmits external force is typically rigidly connected to the valve seat to minimize attenuation of the external force transmitted to the valve seat and achieve expansion of the valve seat toward the valve body. However, the number of valve seat springs is large, and the pre-compression force applied is high. During valve assembly, improper operation can easily cause damage to the gate and valve seat within the cavity, leading to gate jamming. Damaged parts require reassembly after they have been repaired and qualified, which prolongs the assembly cycle. Furthermore, the gate and valve seat are precision parts, and repairing damaged parts increases manufacturing costs.

[0003] In response to the above-mentioned problems, the present application provides a small-diameter gate valve seat assembly tool, which realizes the effective assembly of small-diameter valves, reduces the occurrence of damage to gate valve parts, and improves assembly efficiency. Utility Model Content

[0004] The purpose of the present utility model is to address the technical problems in the prior art of limited operating space in the valve body channel of small-diameter gate valves and the possibility of valve damage caused by improper operation. Through the embodiments of the present application, a small-diameter gate valve seat assembly tool is provided, which realizes the expansion of the distance between the valve seats, provides the effective gap required for assembly, and at the same time, the force applied to the pull rod is more stable, thereby improving the reliability of product assembly.

[0005] In order to achieve the above-mentioned purpose of the utility model, the utility model provides the following technical solutions:

[0006] A small-caliber gate valve seat assembly tool comprises: a threaded sleeve with a through hole, the threaded sleeve being threadedly connected to a thrust nut with a through hole, the through hole of the threaded sleeve, the through hole of the thrust nut, and a valve body passage forming a first passage; at least one tie rod is further included in the first passage; a support block is provided between the tie rod and the first passage;

[0007] A first convex step is provided on a side of the pull rod that is opposite to the first channel and close to the valve seat. After the support block pushes the pull rod, the first convex step cooperates with a first concave step provided on the inner side of the valve seat to form a limit. A second convex step is provided on a side of the pull rod that is opposite to the first channel and close to the thrust nut. The second convex step cooperates with an end of the thrust nut away from the threaded sleeve to form a limit.

[0008] The thrust nut moves in a direction away from the valve seat, and pushes the pull rod to slide by pushing the second convex step, so that the first convex step pushes the valve seat to compress the valve seat spring, thereby increasing the distance between the valve seats.

[0009] As a preferred technical solution of the present application, a threaded surface is provided on the outer peripheral surface of the threaded sleeve.

[0010] As a preferred technical solution of the present application, the threaded surface is arranged on the outer peripheral surface of the threaded sleeve close to the thrust nut; and a clamping surface is also arranged on the outer peripheral surface of the threaded sleeve adjacent to the threaded surface.

[0011] As a preferred technical solution of the present application, a third convex step is provided at one end of the thrust nut away from the threaded sleeve.

[0012] As a preferred technical solution of the present application, a fourth convex step is provided at one end of the support block close to the thrust nut, and a radial surface of the fourth convex step is opposite to the thrust nut.

[0013] As a preferred technical solution of the present application, at least one of the support blocks is arranged between the plurality of pull rods, so that the pull rods are subjected to a thrust force provided by the support block in a radial direction.

[0014] As a preferred technical solution of the present application, a plurality of the pull rods are evenly distributed around the first channel, so that the pull rods evenly apply force to the valve seat.

[0015] As a preferred technical solution of the present application, a surface of the pull rod close to the first channel is adapted to the inner side of the first channel.

[0016] As a preferred technical solution of the present application, the sum of the thicknesses of the support block and the pull rod in the radial direction is adapted to the inner diameter of the valve body channel.

[0017] As a preferred technical solution of the present application, the diameter of the through hole of the threaded sleeve and / or the thrust nut is adapted to the diameter of the valve body channel.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] When the assembly tool provided by the present application is used, the support block is used to prop up the pull rod, and the first convex step cooperates with the first concave step of the valve seat process ring groove to realize the rigid connection between the pull rod and the valve seat. Then, by rotating the thrust nut to make it fit with the radial plane of the second convex step of the pull rod, the thrust nut is continued to be rotated to realize the sliding of the pull plate in the first channel along the axial direction, thereby achieving the expansion of the valve seat; through spiral transmission, the force applied is greater, and the force applied to the pull rod is also more stable, which improves the reliability of product assembly; after the expansion of the distance between the valve seats, an effective gap required for assembly is provided, and the gate plate can be freely installed, which is beneficial to protecting the sealing surface of the gate plate and the valve seat and meeting the sealing requirements of the valve; the present application has a simple structure and few tooling accessories, which reduces the difficulty of operation during the assembly and disassembly of the valve, effectively reduces the risk of damage to the internal parts of the valve, and improves the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the assembly tooling and gate valve after installation for this application;

[0021] Figure 2 for Figure 1 Middle AA section;

[0022] Figure 3 It is a side view of the assembly tool;

[0023] Figure 4 for Figure 3 Schematic diagram of the cross-section structure of the middle assembly tooling BB;

[0024] Figure 5 is a top view of the support block;

[0025] Figure markings: 1-threaded sleeve, 11-first channel, 12-threaded surface, 13-clamping surface, 2-thrust nut, 21-third convex step, 3-pull rod, 31-first convex step, 32-second convex step, 4-support block, 41-fourth convex step, 5-valve seat, 51-first concave step, 6-valve body. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them.

[0027] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0030] In the description of this utility model, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the utility model product is typically placed when in use, or the orientations or positional relationships commonly understood by those skilled in the art. Such terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" and the like are used solely for distinction and description and should not be construed as indicating or implying relative importance.

[0031] For example Figure 1-Figure 2 As shown, the assembly tool provided in the present application is used for installing a gate valve with a small-diameter valve body and 6 channels. It includes a threaded sleeve 1 provided with a through hole. The threaded sleeve 1 is threadedly connected to a thrust nut 2 provided with a through hole. The through hole of the threaded sleeve 1, the through hole of the thrust nut 2, and the valve body 6 channels form a first channel 11; the first channel 11 also includes at least one pull rod 3. At least one support block 4 is provided between the side of the pull rod 3 close to the axis of the first channel 11 and the first channel 11. The support block 4 is used to push the pull rod 3 close to the inner side of the first channel 11. Preferably, the assembly tool includes multiple support blocks 4 of different thicknesses, so that the assembly tool can adapt to the installation of valves with multiple valve bodies and 6 channels of different small diameters.

[0032] For example Figure 2-Figure 4As shown, a first convex step 31 is provided on the side of the pull rod 3 that is opposite the first channel 11 and close to the valve seat 5. When the support block 4 pushes the pull rod 3, the first convex step 31 cooperates with a first concave step 51 provided on the inner side of the valve seat 5 to form a stop, thereby achieving a rigid connection between the pull rod 3 and the valve seat 5. Preferably, the valve seat 5 is provided with two opposing first concave steps 51, forming a process groove. Further preferably, the first concave steps 51 are arranged around the inner side of the valve seat 5 to form a process ring groove, allowing multiple pull rods 3 to be arranged at different positions in the process ring groove, thereby increasing the flexibility of the use of the pull rod 3. Preferably, the first convex step 31 is arranged in a position in the process ring groove close to the valve seat spring to reduce the loss of force transmitted by the pull rod 3. A second convex step 32 is provided on the side of the pull rod 3 that is opposite the first channel 11 and close to the thrust nut 2. The second convex step 32 cooperates with the end of the thrust nut 2 away from the threaded sleeve 1 to form a stop.

[0033] The thrust nut 2 moves in the direction away from the valve seat 5, and pushes the pull rod 3 to slide by pushing the second convex step 32, so that the first convex step 31 pushes the valve seat 5 to compress the valve seat spring, thereby increasing the distance between the valve seats 5. The pull rod 3 is pushed to slide by screwing in or out the thrust nut 2. The positioning accuracy is high and the output force is stable, which is convenient for observation during operation. Whether to continue to rotate the thrust nut 2 can be determined in real time according to the distance between the valve seats 5.

[0034] As a preferred embodiment, threaded surfaces 12 are provided on the outer circumference of the threaded sleeve 1 and the inner circumference of the thrust nut 2. Furthermore, threaded surface 12 is provided on the outer circumference of the threaded sleeve 1 near the thrust nut 2 to facilitate rotation of the thrust nut 2. A clamping surface 13 is also provided on the outer circumference of the threaded sleeve 1 away from the thrust nut 2, adjacent to threaded surface 12. Preferably, clamping surface 13 is flat. During assembly, a clamping tool is used to act on clamping surface 13, preventing the threaded sleeve 1 from rotating when the thrust nut 2 is rotated, thereby improving assembly efficiency.

[0035] Furthermore, for example Figure 4 As shown, a third raised step 21 is provided on the inner side of the thrust nut 2 at the end away from the threaded sleeve 1. The radial plane of the third raised step 21 is opposite the end of the threaded sleeve 1 that is closer to the thrust nut 2. The threaded sleeve 1 limits the thrust nut 2, reducing the distance the thrust nut 2 moves toward the threaded sleeve 1 and improving operational efficiency. Preferably, the inner diameter of the third raised step 21 matches the inner diameter of the through hole of the threaded sleeve 1, so that the combined thickness of the pull rod 3 and support block 4 that can be adapted in the through holes of the threaded sleeve 1 and the thrust nut 2 remains consistent.

[0036] In another embodiment of the present application, a threaded surface 12 is provided on the inner circumference of the threaded sleeve 1 and the outer circumference of the thrust nut 2. The inner diameter of the through hole of the thrust nut 2 matches the inner diameter of the through hole of the threaded sleeve 1. This allows the outer diameters of the threaded sleeve 1 and the thrust nut 2 to be matched during manufacturing, reducing the size of the assembly tooling. A third raised step 21 is provided on the outer end of the thrust nut 2, away from the threaded sleeve 1.

[0037] As a preferred embodiment, for example Figure 4 and Figure 5 As shown, a fourth convex step 41 is provided at one end of the support block 4 close to the thrust nut 2, and the radial plane of the fourth convex step 41 is opposite to the thrust nut 2, so that the thrust nut 2 limits the support block 4. After the support block 4 is pushed between the pull rods 3, the support block 4 can also move with the thrust nut 2 in the direction away from the threaded sleeve 1, making it difficult for the support block 4 to penetrate into the first channel 11, resulting in increased difficulty in disassembly.

[0038] Furthermore, the axial length of the support block 4 matches the axial length of the pull rod 3, so that the support block 4 can fully support the pull rod 3 in the axial direction, while increasing the contact area and reducing the probability of relative sliding during the sliding process.

[0039] In other embodiments, a plurality of tie rods 3 of different lengths are included to adapt to different lengths of the valve body 6 passage. Specifically, the length of the tie rod 3 is greater than the sum of the axial lengths of the valve body 6 passage, the threaded sleeve 1, the third convex step 21, and the first concave step 51.

[0040] As a preferred embodiment, at least one support block 4 is disposed between the plurality of tie rods 3, so that the tie rods 3 are subjected to a radial thrust provided by the support block 4. The surfaces of the plurality of tie rods 3 adjacent to the first channel 11 are adapted to the curvature of the inner side of the first channel 11, thereby reducing the probability of the tie rods 3 damaging the tooling and the inner side of the valve body 6 channel. The plurality of tie rods 3 are evenly distributed around the first channel 11, and the central angles formed between the tie rods 3 around the axis of the valve body 6 channel are equal. When the tie rods 3 slide, the valve seat spring between the valve seat 5 and the valve body 6 is evenly stressed, so that the sliding distance between the tie rods 3 and the valve seat 5 remains consistent.

[0041] In another embodiment, the assembly tooling includes a tie rod 3 and a support block 4. The surfaces of the tie rod 3 and support block 4 facing the first passage 11 align with the interior of the first passage 11, reducing the likelihood of damage to the tooling and the interior of the passageway of the valve body 6 by the tie rod 3 and support block 4. The radial thickness of the tie rod 3 and support block 4 matches the inner diameter of the first passage 11.

[0042] As a preferred embodiment, the sum of the radial thicknesses of the support block 4 and the tie rod 3 matches the inner diameter of the valve body 6 passage, so that the side of the tie rod 3 proximate to the valve body 6 passage mates with the inner side of the valve body 6 passage, achieving radial positioning of the tie rod 3 and improving the smoothness of the axial sliding of the tie rod 3 along the first passage 11. Furthermore, the diameter of the through hole of the threaded sleeve 1 and / or the thrust nut 2 matches the diameter of the valve body 6 passage. With the joint support of the tie rod 3 and the support block 4, the threaded sleeve 1 and / or the thrust nut 2 coincide with the axial centerline of the valve body 6 passage, forming the first passage 11 into a straight channel, further improving the smoothness of the axial sliding of the tie rod 3.

[0043] In another embodiment, the sum of the thicknesses of the support block 4 and the pull rod 3 in the radial direction is adapted to the inner diameter of the valve body 6 channel, the diameter of the through hole of the threaded sleeve 1 and / or the thrust nut 2 is larger than the diameter of the valve body 6 channel, and the pull rod 3 achieves smooth axial sliding by fitting with the inner side of the valve body 6 channel. The thrust nut 2 is clamped by a clamping tool to reduce direct contact between the pull rod 3 and the threaded sleeve 1 and / or the thrust nut 2, thereby reducing the sliding friction force on the pull rod 3 and facilitating its axial sliding.

[0044] A method for using the assembly tool provided in this application includes:

[0045] Step S1: Install a valve seat spring in the space where the valve seat 5 and the valve body 6 are opposite to each other in the axial direction of the first channel 11, and then install the valve body 6 as a whole;

[0046] Step S2: Screw the threaded sleeve 1 and the thrust nut 2 together, and install the pull rod 3 as a whole into the through hole of the threaded sleeve 1. At this time, do not install the support block 4;

[0047] Step S3: The tie rod 3 is installed into the valve body 6 through the valve body 6 channel, and the support block 4 is pushed between the tie rods 3, pushing the tie rod 3 so that the first convex step 31 enters the process ring groove of the valve seat 5. The tie rod 3 is completely fitted with the process ring groove, and the first convex step 31 cooperates with the first concave step 51 in the process ring groove to form a limit, thereby achieving a rigid connection between the tie rod 3 and the valve seat 5;

[0048] Step S4: Clamp the threaded sleeve 1 and unscrew the thrust nut 2 in a direction away from the valve body 6, so that the thrust nut 2 fits in with the second convex step 32 of the pull rod 3. At the same time, the threaded sleeve 1 fits in with the valve body 6, providing positioning and support for the threaded sleeve 1. The friction between the threaded sleeve 1 and the valve body 6 further makes it difficult for the threaded sleeve 1 to rotate with the thrust nut 2. If the pull rod 3 is too long and the thrust nut 2 does not fit in with the second convex step 32 of the pull rod 3 or the threaded sleeve 1 does not fit in with the valve body 6, a spacer can be added between the threaded sleeve 1 and the valve body 6 to achieve fit.

[0049] Step S5: Continue to rotate the thrust nut 2, and use the thread stroke to push the second convex step 32 to push the pull rod 3 to slide, so that the first convex step 31 pushes the valve seat 5 to compress the valve seat spring;

[0050] Step S6: Keep the valve seat spring on one side of the valve body 6 in a compressed state, and use another assembly tool to perform the same operation on the valve seat 5 on the other side of the valve body 6 until the inner cavity space size of the valve body 6 meets the assembly clearance; install the gate plate and place it in the correct position; screw the thrust nut 2 in the direction close to the valve body 6 to remove the thread force between the thrust nut 2 and the threaded sleeve 1; remove the support block 4, retract the pull rod 3, and remove the pull rod 3 from the first channel 11.

[0051] When the assembly tool provided by the present application is used, the support block is used to prop up the pull rod, and the first convex step cooperates with the first concave step of the valve seat process ring groove to realize the rigid connection between the pull rod and the valve seat. Then, by rotating the thrust nut to make it fit with the radial plane of the second convex step of the pull rod, the thrust nut is continued to be rotated to realize the sliding of the pull plate in the first channel along the axial direction, thereby achieving the expansion of the valve seat; through spiral transmission, the force applied is greater, and the force applied to the pull rod is also more stable, which improves the reliability of product assembly; after the expansion of the distance between the valve seats, an effective gap required for assembly is provided, and the gate plate can be freely installed, which is beneficial to protecting the sealing surface of the gate plate and the valve seat and meeting the sealing requirements of the valve; the present application has a simple structure and few tooling accessories, which reduces the difficulty of operation during the assembly and disassembly of the valve, effectively reduces the risk of damage to the internal parts of the valve, and improves the service life of the valve.

[0052] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention are included in the scope of the claims of the present invention.

Claims

1. A small-caliber gate valve seat assembly tool, characterized in that: include: A threaded sleeve having a through hole is threadedly connected to a thrust nut having a through hole, wherein the through hole of the threaded sleeve, the through hole of the thrust nut, and the valve body passage form a first passage; the first passage further includes at least one pull rod; a support block is provided between the pull rod and the first passage; A first convex step is provided on a side of the pull rod that is opposite to the first channel and close to the valve seat. After the support block pushes the pull rod, the first convex step cooperates with a first concave step provided on the inner side of the valve seat to form a limit. A second convex step is provided on a side of the pull rod that is opposite to the first channel and close to the thrust nut. The second convex step cooperates with an end of the thrust nut away from the threaded sleeve to form a limit. The thrust nut moves in a direction away from the valve seat, and pushes the pull rod to slide by pushing the second convex step, so that the first convex step pushes the valve seat to compress the valve seat spring, thereby increasing the distance between the valve seats.

2. The tooling according to claim 1, wherein: The outer peripheral surface of the threaded sleeve is provided with a threaded surface.

3. The tooling according to claim 2, characterized in that: The threaded surface is arranged on the outer peripheral surface of the threaded sleeve close to the thrust nut; and a clamping surface is also arranged on the outer peripheral surface of the threaded sleeve adjacent to the threaded surface.

4. The tooling according to claim 1, wherein: A third convex step is provided on one end of the thrust nut away from the threaded sleeve.

5. The tooling according to claim 1, wherein: A fourth convex step is provided at one end of the support block close to the thrust nut, and a radial surface of the fourth convex step is opposite to the thrust nut.

6. The tooling according to any one of claims 1 to 5, characterized in that: At least one of the support blocks is disposed between the plurality of pull rods, so that the pull rods are subjected to a thrust force provided by the support block in a radial direction.

7. The tooling according to any one of claims 1 to 5, characterized in that: The plurality of tie rods are evenly distributed around the first channel, so that the tie rods evenly apply force to the valve seat.

8. The tooling according to any one of claims 1 to 5, characterized in that: A surface of the pull rod close to the first channel is adapted to the inner side of the first channel.

9. The tooling according to any one of claims 1 to 5, characterized in that: The sum of the thicknesses of the support block and the pull rod in the radial direction is adapted to the inner diameter of the valve body channel.

10. The tooling according to claim 9, wherein: The diameter of the through hole of the threaded sleeve and / or the thrust nut is adapted to the diameter of the valve body passage.

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