Low temperature bellows gate valve

Abstract

The utility model provides a low temperature bellows valve, including gate valve main part and valve rod, gate valve main part and valve rod sliding connection, the outside of gate valve main part is equipped with the locking mechanism for locking valve rod, locking mechanism includes the mounting seat of fixed in the outer wall of gate valve main part and the connecting block of sliding connection with mounting seat, the lateral wall of connecting block is hinged with swing lever, and one end of swing lever is connected with the cooperation locking rod through the cooperation pin, the utility model discloses a locking mechanism (mounting seat, connecting block, swing lever, cooperation locking rod, vertical rod, spring, connecting rod, locking wedge, cooperation elastic piece) is used in cooperation with valve rod, has realized the accurate locking and unlocking function of valve rod, the advantage is can prevent non - working personnel mistake and touch valve rod and lead valve door mistake open mistake and close, avoid pipeline and cannot normally run and safety accident, and the guide inclined plane on mounting seat, the guide inclined plane and the unlocking inclined plane auxiliary cooperation pin action, make the locking / unlocking process more smooth, improve operating stability.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve technology, and more specifically, it relates to a low-temperature bellows gate valve. Background Technology

[0002] Cryogenic bellows gate valves are a special type of gate valve. Their opening and closing element is a gate, and its movement direction is perpendicular to the fluid direction. They can only be fully open or fully closed. Because the bellows structure forms a metal barrier between the fluid medium and the atmosphere, it has excellent sealing performance. Therefore, it is widely used in extreme low-temperature conditions such as liquid nitrogen transportation. As a key control component of cryogenic pipeline systems, its sealing reliability, operational stability, and structural weather resistance directly affect production safety and operating efficiency.

[0003] However, as is known in the prior art, bellows gate valves can only be opened and closed under specific circumstances during use. However, the adjustment part of the gate valve is easily touched by non-operators, causing the valve body to open accidentally when it is closed, or close accidentally when it is open, which in turn causes the pipeline to malfunction and may lead to dangerous accidents.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a low-temperature bellows gate valve in order to achieve a more practical value. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a low-temperature bellows gate valve, which is achieved by the following specific technical means:

[0006] A cryogenic bellows gate valve includes a gate valve body and a valve stem, which are slidably connected. A locking mechanism for locking the valve stem is provided on the outer side of the gate valve body. The locking mechanism includes a mounting base fixed to the outer wall of the gate valve body and a connecting block slidably connected to the mounting base. A swing rod is hinged to the side wall of the connecting block, and one end of the swing rod is connected to a locking rod via a mating pin. A vertical rod is slidably connected to the bottom side of the connecting block, and a spring is fitted onto the outer wall of the vertical rod. A connecting rod is connected to the outer side of the valve stem, and a locking wedge is connected to the bottom end of the connecting rod. Both sides of the locking wedge are provided with mating elastic elements, and the bottom ends of both sets of mating elastic elements are mounted on the side wall of the connecting block. From left to right, the mounting base facing the bottom end of the mating pin has a guide slope, a guide ramp, and an unlocking ramp, all of which can be used with the mating pin.

[0007] Preferably, one end of the gate valve body is connected to a connecting part, and a first protective ring and a second protective ring are respectively fitted at the connection between the gate valve body and the connecting part. The inner sidewalls of the first and second protective rings are provided with arc-shaped sealing protrusions, and a sealing cavity is formed between the second protective ring and the first protective ring. The sealing cavity is filled with low-temperature resistant sealing filler.

[0008] Preferably, the top outer walls of the second protective ring and the first protective ring are respectively provided with a first mating block and a second mating block. The top sides of the first mating block and the second mating block are respectively provided with a T-shaped connecting groove and a T-shaped connecting block adapted to the T-shaped connecting groove. The T-shaped connecting block and the T-shaped connecting groove are slidably engaged. The side wall of the first mating block is provided with a plug groove, the side wall of the T-shaped connecting block is provided with a plug pin adapted to the plug groove, the inner wall of the plug groove is provided with an inner groove limiting flange, and the outer wall of the plug pin is provided with a limiting structure adapted to the inner groove limiting flange.

[0009] Preferably, the second docking block has a portable handle on its side wall, which is detachably connected to the valve stem; the inner side wall of the portable handle has an anti-slip structure, and the outer side of the portable handle is covered with a heat insulation sleeve made of low-temperature resistant elastic material, with the inner wall of the heat insulation sleeve fitting against the outer wall of the portable handle.

[0010] Preferably, the end of the locking rod away from the mating pin is provided with a guide structure, and the outer side of the guide structure is provided with a wear-resistant layer; the outer wall of the valve stem is provided with a locking groove that matches the locking rod, and the inner wall of the locking groove is provided with a buffer structure that fits against the end of the locking rod.

[0011] Preferably, a dustproof ring is provided on the outer side of the second protective ring, and the dustproof ring is integrally formed with the second protective ring. The inner sidewall of the dustproof ring is provided with a flow guiding slope. Both the first and second protective rings are made of low-temperature resistant metal material, and both have an anti-corrosion layer on their outer surface.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model uses a locking mechanism (mounting base, connecting block, swing rod, locking rod, upright rod, spring, connecting rod, locking wedge, and elastic element) in conjunction with the valve stem to achieve precise locking and unlocking of the valve stem. The advantage is that it can prevent unauthorized personnel from accidentally touching the valve stem, causing the valve to open or close accidentally, thus avoiding pipeline malfunctions and safety accidents. At the same time, the guide slope, guide slope, and unlocking slope on the mounting base assist in the action of the locking / unlocking pin, making the locking / unlocking process smoother and improving operational stability.

[0014] 2. This utility model uses the first protective ring and the second protective ring in conjunction with the connection between the gate valve body and the connecting part. Combined with the arc-shaped sealing protrusion on the inner side wall of both and the low-temperature resistant sealing packing in the sealing cavity, it achieves a double sealing effect at the connection. The advantage is that it can block the leakage of low-temperature medium from the gap between the valve stem and the gate valve body, and between the gate valve body and the connecting part, adapting to the sealing requirements under low-temperature conditions and ensuring the pipeline sealing performance.

[0015] 3. This utility model achieves rapid docking and stable fixing of the gate valve and external pipeline by using the first docking block (with T-shaped connecting groove, plug groove, and groove inner limiting flange) and the second docking block (with T-shaped connecting block, plug pin, and limiting structure). The advantage is that the sliding fit between the T-shaped connecting block and the T-shaped connecting groove facilitates rapid assembly, and the engagement between the plug pin and the plug groove, and the locking flange and the limiting structure can prevent loosening after docking, thus improving the pipeline connection efficiency and stability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the disassembly state of this utility model.

[0018] Figure 3 yes Figure 1 Enlarged schematic diagram of structure A in the middle.

[0019] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0020] 1. Gate valve; 2. Valve stem; 3. Locking mechanism; 301. Connecting rod; 302. Locking wedge; 303. Matching elastic element; 304. Connecting block; 305. Mounting base; 306. Vertical rod; 307. Spring; 308. Swing rod; 309. Matching locking rod; 310. Matching pin; 311. Guide slope; 312. Guide slope; 313. Unlocking slope; 4. First protective ring; 5. Second protective ring; 6. Connecting part; 7. First mating block; 8. Second mating block; 9. Portable handle; 10. T-shaped connecting block; 11. T-shaped connecting groove; 12. Insertion groove; 13. Insertion pin; 14. Inner groove limiting flange. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example:

[0023] As attached Figure 1 To be continued Figure 3 As shown:

[0024] This utility model provides a low-temperature bellows gate valve, including a gate valve body 1 and a valve stem 2, which are slidably connected. A locking mechanism 3 for locking the valve stem 2 is provided on the outer side of the gate valve body 1. The locking mechanism 3 includes a mounting base 305 fixed to the outer wall of the gate valve body 1 and a connecting block 304 slidably connected to the mounting base 305. A swing rod 308 is hinged to the side wall of the connecting block 304. One end of the swing rod 308 is connected to a locking rod 309 via a locking pin 310. The bottom side of the connecting block 304 is slidably connected. There is a vertical rod 306, and a spring 307 is fitted on the outer wall of the vertical rod 306. A connecting rod 301 is connected to the outer side of the valve stem 2. A locking wedge 302 is connected to the bottom end of the connecting rod 301. Both sides of the locking wedge 302 are provided with a mating elastic element 303. The bottom ends of the two sets of mating elastic elements 303 are installed on the side wall of the connecting block 304. The mounting base 305 facing the bottom end of the mating pin 310 is provided with a guide slope 311, a guide slope 312 and an unlocking slope 313, which can be used to mate with the mating pin 310, from left to right.

[0025] The gate valve body 1 is connected to a connecting part 6 at one end. A first protective ring 4 and a second protective ring 5 are respectively fitted at the connection between the gate valve body 1 and the connecting part 6. The inner walls of the first protective ring 4 and the second protective ring 5 are provided with arc-shaped sealing protrusions. A sealing cavity is formed between the second protective ring 5 and the first protective ring 4. The sealing cavity is filled with low-temperature resistant sealing filler. The gate valve body 1, the connecting part 6 and the first protective ring 4 and the second protective ring 5 are used in conjunction. The first protective ring 4 and the second protective ring 5 are fitted at the connection between the gate valve body 1 and the connecting part 6, and the arc-shaped sealing protrusions on the inner walls of the two are in contact with the surface of the parts. At the same time, the sealing cavity formed between the second protective ring 5 and the first protective ring 4 is filled with low-temperature resistant sealing filler, thus achieving a double sealing effect at the connection between the gate valve body 1 and the connecting part 6.

[0026] The second protective ring 5 and the first protective ring 4 are respectively provided with a first mating block 7 and a second mating block 8 on their top outer walls. The top sides of the first mating block 7 and the second mating block 8 are respectively provided with a T-shaped connecting groove 11 and a T-shaped connecting block 10 adapted to the T-shaped connecting groove 11. The T-shaped connecting block 10 and the T-shaped connecting groove 11 are slidably engaged. The side wall of the first mating block 7 is provided with a plug groove 12, and the side wall of the T-shaped connecting block 10 is provided with a plug pin 13 adapted to the plug groove 12. The inner wall of the plug groove 12 is provided with an inner groove limiting flange 14, and the outer wall of the plug pin 13 is provided with a groove limiting flange 14. A limiting structure adapted to the limiting flange 14 in the groove is provided. The first docking block 7 and the second docking block 8 on the outer wall of the top of the second protective ring 5 and the first protective ring 4 are used together. The T-shaped connecting groove 11 of the first docking block 7 and the T-shaped connecting block 10 of the second docking block 8 are slidably engaged. The insertion groove 12 of the first docking block 7 is adapted to the insertion pin 13 of the second docking block 8. The limiting flange 14 in the groove on the inner wall of the insertion groove 12 is engaged with the limiting structure on the outer wall of the insertion pin 13, so as to realize the quick docking and stable fixation effect between the gate valve body 1 and the external pipeline.

[0027] The second docking block 8 has a portable handle 9 on its side wall, which is detachably connected to the valve stem 2. The inner side wall of the portable handle 9 has an anti-slip structure, and the outer side of the portable handle 9 is covered with a heat insulation sleeve made of low-temperature resistant elastic material. The inner wall of the heat insulation sleeve fits into the outer wall of the portable handle 9. The portable handle 9 on the side wall of the second docking block 8 works in conjunction with the valve stem 2 and the heat insulation sleeve. The portable handle 9 and the valve stem 2 are detachably connected. The anti-slip structure on its inner side wall increases the grip friction, and the heat insulation sleeve made of low-temperature resistant elastic material fits into the outer wall of the handle, thus achieving convenient valve stem operation and low-temperature protection.

[0028] Among them, the end of the locking rod 309 away from the mating pin 310 is provided with a guide structure, and the outer side of the guide structure is provided with a wear-resistant layer.

[0029] The second protective ring 5 has a dustproof ring on its outer side, which is integrally formed with the second protective ring 5. The inner wall of the dustproof ring has a flow-guiding slope. Both the first protective ring 4 and the second protective ring 5 are made of low-temperature resistant metal material, and both have an anti-corrosion layer on their outer surface. By using the second protective ring 5 in conjunction with the dustproof ring and the first protective ring 4, the dustproof ring is integrally formed with the second protective ring 5 and has a flow-guiding slope on its inner wall. Both the first protective ring 4 and the second protective ring 5 are made of low-temperature resistant metal material and have an anti-corrosion layer on their outer surface, thus achieving the dustproof and flow-guiding, low-temperature resistant, and anti-corrosion effects of the protective ring.

[0030] The working principle of this embodiment is as follows: When the valve stem 2 needs to be locked, the connecting rod 301 connected to the outer side of the valve stem 2 drives the locking wedge 302 at its bottom end to move synchronously; the elastic members 303 on both sides of the locking wedge 302 are deformed by the compression of the locking wedge 302, and at the same time generate a reverse thrust to push the connecting block 304 to slide along the mounting base 305; during the sliding process of the connecting block 304, the vertical rod 306 slidably connected to its bottom side moves synchronously with the connecting block 304, and the spring 307 fitted on the outer wall of the vertical rod 306 is compressed or stretched accordingly, and the elastic force of the spring 307 adjusts the connecting block 304. The sliding position and stability are ensured; at the same time, the swing rod 308 hinged to the side wall of the connecting block 304 rotates around the hinge point, and one end of the swing rod 308 causes the mating pin 310 to be engaged in the bottom end of the mating locking rod 309, and the top side of the locking wedge block 302 and the mating elastic element 303 remain in contact, thus finally completing the locking of the valve stem 2; during this process, the guide slope 311 of the mounting base 305 facing the bottom end of the mating pin 310 can assist the mating pin 310 to accurately enter the working position, and the guide slope 312 further ensures that the mating locking rod 309 and the locking groove of the valve stem 2 are accurately aligned and engaged.

[0031] In terms of sealing and protection, the first protective ring 4 and the second protective ring 5 fitted at the connection between the gate valve body 1 and the connecting part 6 adhere to the surface of the component through the arc-shaped sealing protrusion on their inner sidewalls, and the sealing cavity formed between the two is filled with low-temperature resistant sealing filler to prevent low-temperature media from leaking from the gap; when the pipeline is connected, the T-shaped connecting block 10 of the second connecting block 8 slides along the T-shaped connecting groove 11 of the first connecting block 7 to achieve initial connection, and then the insertion pin 13 on the side wall of the T-shaped connecting block 10 is inserted into the insertion groove 12 of the first connecting block 7. The groove limiting flange 14 on the inner wall of the insertion groove 12 engages with the limiting structure on the outer wall of the insertion pin 13 to complete the stable fixation; when operating the valve stem 2, the portable handle 9 on the side wall of the second connecting block 8 is detachably connected to the valve stem 2 for easy gripping. Its inner sidewall anti-slip structure prevents hand slippage, and the heat insulation sleeve made of low-temperature resistant elastic material on the outer side prevents the operator from being frozen by contact with low-temperature components. The whole system achieves reliable valve locking, tight sealing, stable connection, and safe operation through the linkage of various components.

[0032] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A low-temperature bellows gate valve, comprising a gate valve body (1) and a valve stem (2), characterized in that: The gate valve body (1) and valve stem (2) are slidably connected. A locking mechanism (3) for locking the valve stem (2) is provided on the outer side of the gate valve body (1). The locking mechanism (3) includes a mounting base (305) fixed to the outer wall of the gate valve body (1) and a connecting block (304) slidably connected to the mounting base (305). A swing rod (308) is hinged to the side wall of the connecting block (304). One end of the swing rod (308) is connected to a locking rod (309) through a locking pin (310). A vertical rod (306) is slidably connected to the bottom side of the connecting block (304). The outer wall of the valve stem (2) is fitted with a spring (307). A connecting rod (301) is connected to the outside of the valve stem (2). A locking wedge (302) is connected to the bottom end of the connecting rod (301). Both sides of the locking wedge (302) are provided with a mating elastic element (303). The bottom ends of the two sets of mating elastic elements (303) are installed on the side wall of the connecting block (304). The mounting base (305) facing the bottom end of the mating pin (310) is provided with a guide slope (311), a guide slope (312), and an unlocking slope (313) from left to right. All of these can be used with the mating pin (310).

2. The low-temperature bellows gate valve as described in claim 1, characterized in that: One end of the gate valve body (1) is connected to a connecting part (6). The connection between the gate valve body (1) and the connecting part (6) is fitted with a first protective ring (4) and a second protective ring (5). The inner walls of the first protective ring (4) and the second protective ring (5) are provided with arc-shaped sealing protrusions. A sealing cavity is formed between the second protective ring (5) and the first protective ring (4). The sealing cavity is filled with low-temperature resistant sealing filler.

3. The low-temperature bellows gate valve as described in claim 2, characterized in that: The top outer walls of the second protective ring (5) and the first protective ring (4) are respectively provided with a first docking block (7) and a second docking block (8). The top sides of the first docking block (7) and the second docking block (8) are respectively provided with a T-shaped connecting groove (11) and a T-shaped connecting block (10) adapted to the T-shaped connecting groove (11). The T-shaped connecting block (10) and the T-shaped connecting groove (11) are slidably engaged. The side wall of the first docking block (7) is provided with a plug groove (12). The side wall of the T-shaped connecting block (10) is provided with a plug pin (13) adapted to the plug groove (12). The inner wall of the plug groove (12) is provided with an inner groove limiting flange (14). The outer wall of the plug pin (13) is provided with a limiting structure adapted to the inner groove limiting flange (14).

4. The low-temperature bellows gate valve as described in claim 3, characterized in that: The second docking block (8) has a portable handle (9) on its side wall. The portable handle (9) is detachably connected to the valve stem (2). The inner side wall of the portable handle (9) has an anti-slip structure. The outer side of the portable handle (9) is covered with a heat insulation sleeve. The heat insulation sleeve is made of low-temperature resistant elastic material. The inner wall of the heat insulation sleeve is in contact with the outer wall of the portable handle (9).

5. The cryogenic bellows gate valve as described in claim 1, characterized in that: The locking rod (309) is provided with a guide structure at the end away from the locking pin (310), and a wear-resistant layer is provided on the outside of the guide structure.

6. The low-temperature bellows gate valve as described in claim 2, characterized in that: The second protective ring (5) is provided with a dustproof ring on the outside. The dustproof ring is integrally formed with the second protective ring (5). The inner wall of the dustproof ring is provided with a flow guiding slope. The first protective ring (4) and the second protective ring (5) are both made of low-temperature resistant metal material, and both have an anti-corrosion layer on their outer surface.

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