A valve with a function of preventing chemical product leakage and its usage method

Abstract

The present invention relates to the field of valves. The present invention discloses a valve with a function of preventing chemical product leakage and its use method. The problem to be solved by the present invention is that the user needs to regularly detect the sealing performance of the connection between the valve and the pipeline, and the operation is relatively troublesome. The present invention is composed of a flange connection mechanism and a sealing mechanism. For the valve with a function of preventing chemical product leakage and its use method, after connecting two flange plates through a screw rod, the sealing ring tube is rotated, so that the clamping rod inside the sealing ring tube is clamped on the limiting arc rod, so that the sealing ring tube seals the connection between the two flange plates; then, by engaging the tooth block in the card slot, the fixed cylinder and the sliding cylinder are docked, and during the docking process, the connecting screw rod on the fixed cylinder abuts against the inclined panel to prevent the sealing ring tube from rotating and resetting, and the fixed cylinder and the sliding cylinder are connected and fixed, achieving the effect of double sealing and ensuring the sealing performance of the connection between the valve body and the pipe body.

Description

Technical Field

[0001] The invention relates to the field of valves, and in particular to a valve with a function of preventing chemical product leakage and a use method thereof. Background Art

[0002] Valves are pipe accessories used to open and close pipes, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveying medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc. Valves are control components in fluid conveying systems and have functions such as shut-off, regulation, flow diversion, backflow prevention, pressure stabilization, flow diversion, or overflow pressure relief.

[0003] After the existing valve with leakage function is connected to the pipeline through the flange, the user needs to regularly check the sealing of the connection between the valve and the pipeline, which is troublesome to operate. When a gap appears at the connection between the valve and the connecting pipe, it is difficult to seal the gap in time, which can easily cause leakage of chemicals and cause pollution. Summary of the invention

[0004] The purpose of the present invention is to provide a valve with a function of preventing chemical product leakage and a method of using the same, so as to solve the problem in the above background technology that users need to regularly check the sealing of the connection between the valve and the pipeline, which is cumbersome to operate. When a gap appears at the connection between the valve and the connecting pipe, it is difficult to seal the gap in time, which easily causes the leakage of chemicals and causes pollution. To achieve the above purpose, the present invention provides the following technical solutions: A valve with a function of preventing chemical product leakage, comprising a valve body, both ends of the valve body are in contact with connecting pipes, and a flange connection mechanism is provided at the connection between the connecting pipe and the valve body;

[0005] A sealing mechanism is also provided at the connection between the connecting pipe and the valve body, and the sealing mechanism is located outside the flange connection mechanism.

[0006] Preferably, the flange connection mechanism comprises two flanges, one of which is fixedly sleeved on the end of the connecting pipe, and the other is fixedly sleeved on the end of the valve body, and the two flanges are connected by a screw;

[0007] A first annular groove is provided on the outer sides of the two flanges, and four limiting arc rods are fixedly connected to the inner wall of the first annular groove on the left side at equal distances in an annular shape, and a sealing ring tube is inserted into the inner wall of the first annular groove on the right side, and four clamping rods are fixedly connected to the inner wall of the sealing ring tube at equal distances in an annular shape, and the four clamping rods are respectively in contact with the four limiting arc rods;

[0008] One end of the sealing ring tube abuts against the inner wall of the first ring groove on the left side, and an inclined plate is fixedly connected to the outer side of the sealing ring tube.

[0009] Preferably, the sealing mechanism includes a fixed cylinder sleeved on the valve body, a connecting screw rod is arranged on the fixed cylinder, the connecting screw rod abuts against the inclined panel, a lifting block is inserted on the outer side of the fixed cylinder, and a compression spring is arranged between the lifting block and the fixed cylinder, and a dial block is fixedly connected to the lifting block;

[0010] The fixed cylinder is outside the flange.

[0011] Preferably, the sealing mechanism further includes a sliding cylinder movably sleeved on the end of the connecting pipe, the sliding cylinder is inserted into the fixed cylinder, and the sliding cylinder and the fixed cylinder are connected by a connecting screw rod. A second annular groove is formed on the inner wall of the sliding cylinder, and a sealing pipe is slidably connected inside the second annular groove. A spring telescopic pipe is fixedly connected to the sealing pipe. The inner pipes of the two spring telescopic pipes both extend to the outside of the sliding cylinder and are fixedly connected with a pull rod. The lower side of the inner rod of the spring telescopic pipe abuts against a limit spring telescopic rod, and the limit spring telescopic rod is fixed on the sliding cylinder;

[0012] Card slots are formed on the inner pipes of the two spring telescopic pipes, and arc-shaped pins are clamped in the card slots. A reset spring telescopic rod is fixedly connected to the arc-shaped pins, and the reset spring telescopic rod is fixed on the sliding cylinder;

[0013] A clamping block is fixedly connected to the arc-shaped pin, and the clamping block abuts against the outside of the dial block.

[0014] Preferably, a tubular groove is formed at the right end of the sealing pipe, and the inner wall of the tubular groove is fixedly connected to the end of the inner pipe of the spring telescopic pipe.

[0015] Preferably, a tooth block is fixedly connected to the end of the sliding cylinder, and the tooth block is clamped in a card slot formed at the end of the fixed cylinder.

[0016] Preferably, the shape of the dial block is L-shaped.

[0017] Preferably, a method for using a valve with a function of preventing chemical product leakage includes the following steps:

[0018] S1: When the user connects the valve body and the pipeline, first dock the flange on the valve body with the flange on the pipeline, and then connect the two flanges with a screw rod and rotate the sealing ring pipe, so that the clamping rod inside the sealing ring pipe is clamped on the limiting arc rod, so that the sealing ring pipe seals the connection between the two flanges;

[0019] Then, the tooth block is clamped in the card slot to dock the fixed cylinder and the sliding cylinder. During the docking process, the connecting screw rod on the fixed cylinder abuts against the inclined panel to prevent the sealing ring pipe from rotating and resetting, and connect and fix the fixed cylinder and the sliding cylinder;

[0020] S2: After the fixed cylinder and the sliding cylinder are connected, the user presses down the limit spring telescopic rod and then pulls the pull rod to drive the inner tube of the spring expansion and contraction tube to move outwards from the sliding cylinder. As the spring expansion and contraction tube moves, it drives the sealing tube to slide in the second annular groove, so that a negative pressure is formed in the cavity formed by the fixed cylinder and the sliding cylinder, thereby detecting the sealing performance after the fixed cylinder and the sliding cylinder are connected;

[0021] S3: And after a negative pressure is formed in the cavity formed by the fixed cylinder and the sliding cylinder, the lifting block is pressed downwards. At this time, the reset spring telescopic rod contracts synchronously to pull the arc-shaped latch to latch on the inner tube of the spring expansion and contraction tube. When the chemical product leaks out between the two flange plates and fills the cavity formed by the fixed cylinder and the sliding cylinder, the pressure in the cavity increases to push the lifting block upwards, driving the dial block to push the latch and the arc-shaped latch upwards synchronously, releasing the locking state of the arc-shaped latch on the inner rod of the spring expansion and contraction tube. At this time, the spring expansion and contraction tube expands and contracts to push the sealing tube to abut against the end face of the inner wall of the fixed cylinder, and the limit spring telescopic rod abuts against the extended spring expansion and contraction tube to temporarily seal the connection between the two flange plates.

[0022] Compared with the prior art, the beneficial effects of the present invention:

[0023] In the present invention, after connecting the two flange plates through the screw rod, the sealing ring tube is rotated, so that the clamping rod inside the sealing ring tube is clamped on the limit arc rod, so that the sealing ring tube seals the connection between the two flange plates; then the tooth block is clamped in the card slot to dock the fixed cylinder and the sliding cylinder, and during the docking process, the connecting screw rod on the fixed cylinder abuts against the inclined panel to prevent the sealing ring tube from rotating and resetting, and connects and fixes the fixed cylinder and the sliding cylinder, achieving the effect of double sealing and ensuring the sealing performance at the connection between the valve body and the pipe body.

[0024] In the present invention, after the fixed cylinder and the sliding cylinder are connected, the user presses down the limit spring telescopic rod and then pulls the pull rod to drive the inner tube of the spring expansion and contraction tube to move outwards from the sliding cylinder. As the spring expansion and contraction tube moves, it drives the sealing tube to slide in the second annular groove, so that a negative pressure is formed in the cavity formed by the fixed cylinder and the sliding cylinder, thereby detecting the sealing performance after the fixed cylinder and the sliding cylinder are connected.

[0025] In the present invention, after a negative pressure is formed in the cavity formed by the fixed cylinder and the sliding cylinder, the lifting block is pressed downwards. At this time, the reset spring telescopic rod contracts synchronously to pull the arc-shaped latch to latch on the inner tube of the spring expansion and contraction tube. When the chemical product leaks out between the two flange plates and fills the cavity formed by the fixed cylinder and the sliding cylinder, the pressure in the cavity increases to push the lifting block upwards, that is, prompting the user that the chemical product leaks at this place.

[0026] In the present invention, when the chemical product leaks out from between the two flanges and fills the cavity formed by the fixed tube and the sliding tube, the pressure in the cavity increases to push the lifting block upward, driving the shifting block to push the clamping block and the arc-shaped latch to move upward synchronously, releasing the locking state of the arc-shaped latch on the inner rod of the spring telescopic tube. At this time, the spring telescopic tube is telescoped to push the sealing tube to contact the end surface of the inner wall of the fixed tube, and the limiting spring telescopic rod contacts the extended spring telescopic tube, thereby temporarily sealing the connection between the two flanges. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0029] Figure 3 It is a three-dimensional unfolded structural schematic diagram of the flange connection mechanism of the present invention;

[0030] Figure 4 It is a three-dimensional structural schematic diagram of the limit arc rod and other structures of the present invention;

[0031] Figure 5 For the present invention Figure 4 A magnified view of the structure at center;

[0032] Figure 6 It is a partial three-dimensional structural cross-sectional view of the sealing mechanism of the present invention;

[0033] Figure 7 It is a partial three-dimensional expanded structural cross-sectional view of the sealing mechanism of the present invention.

[0034] In the figure: 1. valve body; 2. connecting pipe; 3. flange connection mechanism; 31. flange plate; 32. screw; 33. first ring groove; 34. limit arc rod; 35. clamping rod; 36. sealing ring tube; 37. inclined plate; 4. sealing mechanism; 41. fixed cylinder; 42. connecting screw; 43. lifting block; 44. shifting block; 45. sliding cylinder; 46. spring telescopic tube; 47. second ring groove; 48. sealing tube; 49. pull rod; 410. arc latch; 411. reset spring telescopic rod; 412. clamping block; 413. tubular groove; 414. tooth block; 415. limit spring telescopic rod. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the present invention.

[0036] Please refer to Figures 1 to 7 , the present invention provides a technical solution: a valve with a function of preventing chemical product leakage, including a valve body 1, both ends of the valve body 1 are abutted against a connecting pipe 2, and a flange connection mechanism 3 is arranged at the connection between the connecting pipe 2 and the valve body 1;

[0037] A sealing mechanism 4 is also arranged at the connection between the connecting pipe 2 and the valve body 1, and the sealing mechanism 4 is outside the flange connection mechanism 3.

[0038] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown, the flange connection mechanism 3 includes two flange plates 31, one of the flange plates 31 is fixedly sleeved on the end of the connecting pipe 2, the other flange plate 31 is fixedly sleeved on the end of the valve body 1, and the two flange plates 31 are connected by a screw 32;

[0039] First annular grooves 33 are respectively formed on the outer sides of the two flange plates 31, four limiting arc rods 34 are fixedly connected to the inner wall of the left first annular groove 33 at equal intervals in a circular shape, a sealing ring pipe 36 is inserted into the inner wall of the right first annular groove 33, four clamping rods 35 are fixedly connected to the inner wall of the sealing ring pipe 36 at equal intervals in a circular shape, and the four clamping rods 35 respectively abut against the four limiting arc rods 34;

[0040] One end of the sealing ring pipe 36 abuts against the inner wall of the left first annular groove 33, and an inclined panel 37 is fixedly connected to the outside of the sealing ring pipe 36.

[0041] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown, the sealing mechanism 4 includes a fixed cylinder 41 sleeved on the valve body 1, a connecting screw 42 is arranged on the fixed cylinder 41, the connecting screw 42 abuts against the inclined panel 37, a lifting block 43 is inserted into the outside of the fixed cylinder 41, and a compression spring is arranged between the lifting block 43 and the fixed cylinder 41, and a dial block 44 is fixedly connected to the lifting block 43; an alarm is arranged on the lifting block 43, and when the lifting block 43 moves upward, the switch of the alarm is triggered to achieve a better warning effect.

[0042] The fixed cylinder 41 is on the outer side of the flange 31. After the fixed cylinder 41 and the sliding cylinder 45 are connected, the user presses down the limit spring telescopic rod 415 and then pulls the pull rod 49 to drive the inner tube of the spring telescopic tube 46 to move outwards from the sliding cylinder 45. As the spring telescopic tube 46 moves, it drives the sealing tube 48 to slide in the second annular groove 47, so that a negative pressure is formed in the cavity composed of the fixed cylinder 41 and the sliding cylinder 45. If the lifting block 43 slowly resets and rises under the action of the compression spring, there will be an air leakage problem in the connection between the valve body 1 and the pipeline. In this way, the sealing performance after the connection of the fixed cylinder 41 and the sliding cylinder 45 can be detected.

[0043] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown, the sealing mechanism 4 further includes a sliding cylinder 45 movably sleeved on the end of the connecting pipe 2. The sliding cylinder 45 is inserted into the fixed cylinder 41, and the sliding cylinder 45 is connected to the fixed cylinder 41 by a connecting screw 42. A second annular groove 47 is formed on the inner wall of the sliding cylinder 45, and a sealing tube 48 is slidably connected inside the second annular groove 47. A spring telescopic tube 46 is fixedly connected to the sealing tube 48. The inner tubes of the two spring telescopic tubes 46 both extend to the outside of the sliding cylinder 45 and are fixedly connected to a pull rod 49. The lower side of the inner rod of the spring telescopic tube 46 abuts against a limit spring telescopic rod 415, and the limit spring telescopic rod 415 is fixed on the sliding cylinder 45;

[0044] Slots are formed on the inner tubes of the two spring telescopic tubes 46, and an arc-shaped plug 410 is clamped in the slots. A reset spring telescopic rod 411 is fixedly connected to the arc-shaped plug 410, and the reset spring telescopic rod 411 is fixed on the sliding cylinder 45;

[0045] A clamping block 412 is fixedly connected to the arc-shaped plug 410, and the clamping block 412 abuts against the outside of the dial block 44.

[0046] In this embodiment, as Figure 1 , Figure 6 , Figure 7 shown, a tubular groove 413 is formed at the right end of the sealing tube 48, and the inner wall of the tubular groove 413 is fixedly connected to the end of the inner tube of the spring telescopic tube 46.

[0047] In this embodiment, as Figure 1 , Figure 6 , Figure 7 shown, a tooth block 414 is fixedly connected to the end of the sliding cylinder 45, and the tooth block 414 is clamped in the slot formed at the end of the fixed cylinder 41, which is convenient for the sliding cylinder 45 to be docked with the fixed cylinder 41.

[0048] In this embodiment, asFigure 1 , Figure 6 , Figure 7 As shown in Figure 7 , the shape of the shifting block 44 is L-shaped.

[0049] Usage method and advantages of the present invention: The usage method of a valve with the function of preventing chemical product leakage is as follows. The working process is as follows:

[0050] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown:

[0051] S1: When the user connects the valve body 1 to the pipeline, first dock the flange 31 on the valve body 1 with the flange 31 on the pipeline, and then connect the two flanges 31 through the screw 32 and rotate the sealing ring pipe 36 so that the clamping rod 35 inside the sealing ring pipe 36 is clamped on the limiting arc rod 34, so that the sealing ring pipe 36 seals the connection of the two flanges 31;

[0052] Then, the tooth block 414 is stuck in the card slot to dock the fixed cylinder 41 and the sliding cylinder 45. During the docking process, the connecting screw 42 on the fixed cylinder 41 abuts against the inclined panel 37 to prevent the sealing ring pipe 36 from rotating and resetting, and connect and fix the fixed cylinder 41 and the sliding cylinder 45;

[0053] S2: After the fixed cylinder 41 and the sliding cylinder 45 are connected, the user presses down the limiting spring telescopic rod 415 and then pulls the pull rod 49 to drive the inner tube of the spring telescopic tube 46 to move outwards from the outside of the sliding cylinder 45. As the spring telescopic tube 46 moves, it drives the sealing tube 48 to slide in the second annular groove 47, so that a negative pressure is formed in the cavity composed of the fixed cylinder 41 and the sliding cylinder 45. If the lifting block 43 slowly resets and rises under the action of the compression spring, there is a problem of air leakage in the connection between the valve body 1 and the pipeline, otherwise there is no problem. In this way, the sealing performance after the connection of the fixed cylinder 41 and the sliding cylinder 45 can be detected;

[0054] S3: After a negative pressure is formed in the cavity composed of the fixed cylinder 41 and the sliding cylinder 45, the lifting block 43 is pressed downwards. At this time, the reset spring telescopic rod 411 contracts synchronously to pull the arc-shaped bolt 410 to be stuck on the inner tube of the spring telescopic tube 46. When the chemical leaks out between the two flange plates 31 and fills the cavity composed of the fixed cylinder 41 and the sliding cylinder 45, the pressure in the cavity increases to push the lifting block 43 upwards, driving the dial block 44 to push the locking block 412 and the arc-shaped bolt 410 to move upwards synchronously, releasing the locking state of the arc-shaped bolt 410 on the inner rod of the spring telescopic tube 46. At this time, the spring telescopic tube 46 expands and contracts to push the sealing tube 48 to abut against the end face of the inner wall of the fixed cylinder 41, and the limit spring telescopic rod 415 abuts against the extended spring telescopic tube 46 to temporarily seal the connection between the two flange plates 31.

[0055] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve with the function of preventing chemical product leakage, comprising a valve body (1), characterized in that: Both ends of the valve body (1) are in contact with connecting pipes (2), and a flange connection mechanism (3) is provided at the connection between the connecting pipe (2) and the valve body (1); A sealing mechanism (4) is also provided at the connection between the connecting pipe (2) and the valve body (1), and the sealing mechanism (4) is outside the flange connection mechanism (3); The flange connection mechanism (3) includes two flange plates (31). One of the flange plates (31) is fixedly sleeved on the end of the connecting pipe (2), and the other flange plate (31) is fixedly sleeved on the end of the valve body (1). The two flange plates (31) are connected by a screw rod (32); First ring grooves (33) are formed on the outer sides of the two flange plates (31). Four limiting arc rods (34) are fixedly connected in an equidistant and annular manner on the inner wall of the left first ring groove (33). A sealing ring pipe (36) is inserted on the inner wall of the right first ring groove (33). Four clamping rods (35) are fixedly connected in an equidistant and annular manner on the inner wall of the sealing ring pipe (36), and the four clamping rods (35) are respectively in contact with the four limiting arc rods (34); One end of the sealing ring pipe (36) is in contact with the inner wall of the left first ring groove (33), and an inclined panel (37) is fixedly connected to the outside of the sealing ring pipe (36); The sealing mechanism (4) includes a fixed cylinder (41) sleeved on the valve body (1). A connecting screw rod (42) is provided on the fixed cylinder (41). The connecting screw rod (42) is in contact with the inclined panel (37). A lifting block (43) is inserted on the outside of the fixed cylinder (41), and a compression spring is provided between the lifting block (43) and the fixed cylinder (41). A dial block (44) is fixedly connected to the lifting block (43); The fixed cylinder (41) is outside the flange plate (31).

2. The valve with the function of preventing chemical product leakage according to claim 1, characterized in that: The sealing mechanism (4) further includes a sliding cylinder (45) movably sleeved on the end of the connecting pipe (2). The sliding cylinder (45) is inserted into the inside of the fixed cylinder (41), and the sliding cylinder (45) is connected to the fixed cylinder (41) by a connecting screw rod (42). A second ring groove (47) is formed on the inner wall of the sliding cylinder (45). A sealing pipe (48) is slidably connected inside the second ring groove (47). A spring telescopic pipe (46) is fixedly connected to the sealing pipe (48). The inner pipes of the two spring telescopic pipes (46) both extend to the outside of the sliding cylinder (45) and are fixedly connected to a pull rod (49). The lower side of the inner rod of the spring telescopic pipe (46) is in contact with a limiting spring telescopic rod (415), and the limiting spring telescopic rod (415) is fixed on the sliding cylinder (45); Card slots are formed on the inner pipes of the two spring telescopic pipes (46). An arc-shaped plug (410) is clamped in the card slots. A reset spring telescopic rod (411) is fixedly connected to the arc-shaped plug (410), and the reset spring telescopic rod (411) is fixed on the sliding cylinder (45); A clamping block (412) is fixedly connected to the arc-shaped plug (410), and the clamping block (412) is in contact with the outside of the dial block (44).

3. The valve with the function of preventing chemical product leakage according to claim 2, characterized in that: A tubular groove (413) is formed at the right end of the sealing tube (48), and the inner wall of the tubular groove (413) is fixedly connected to the end of the inner tube of the spring telescopic tube (46).

4. A valve with the function of preventing chemical product leakage according to claim 3, characterized in that: A tooth block (414) is fixedly connected to the end of the sliding cylinder (45), and the tooth block (414) is clamped in the card slot formed at the end of the fixed cylinder (41).

5. A valve with a function of preventing chemical product leakage according to claim 2, characterized in that: The shape of the dial block (44) is L-shaped.

6. The usage method of a valve with the function of preventing chemical product leakage according to claim 4, characterized in that: It includes the following steps: S1: When the user connects the valve body (1) to the pipeline, first dock the flange (31) on the valve body (1) with the flange (31) on the pipeline, and then connect the two flanges (31) through the screw (32). After that, rotate the sealing ring tube (36) so that the clamping rod (35) inside the sealing ring tube (36) is clamped on the limiting arc rod (34), so that the sealing ring tube (36) seals the connection part of the two flanges (31). Then, the tooth block (414) is clamped in the card slot to dock the fixed cylinder (41) and the sliding cylinder (45). During the docking process, the connecting screw (42) on the fixed cylinder (41) abuts against the inclined panel (37) to prevent the sealing ring tube (36) from rotating and resetting, and connect and fix the fixed cylinder (41) and the sliding cylinder (45). S2: After the fixed cylinder (41) and the sliding cylinder (45) are connected, the user presses down the limit spring telescopic rod (415) and then pulls the pull rod (49) to drive the inner tube of the spring telescopic tube (46) to move outwards of the sliding cylinder (45). As the spring telescopic tube (46) moves, it drives the sealing tube (48) to slide in the second annular groove (47), so that a negative pressure is formed in the cavity formed by the fixed cylinder (41) and the sliding cylinder (45), thereby detecting the sealing performance after the connection of the fixed cylinder (41) and the sliding cylinder (45). S3: After a negative pressure is formed in the cavity formed by the fixed cylinder (41) and the sliding cylinder (45), the lifting block (43) is pressed downwards. At this time, the reset spring telescopic rod (411) contracts synchronously to pull the arc-shaped plug (410) to be clamped on the inner tube of the spring telescopic tube (46). When the chemical product leaks out from between the two flanges (31) and fills the cavity formed by the fixed cylinder (41) and the sliding cylinder (45), the pressure in the cavity increases to push the lifting block (43) upwards, driving the dial block (44) to push the clamping block (412) and the arc-shaped plug (410) to move upwards synchronously, releasing the locking state of the arc-shaped plug (410) on the inner rod of the spring telescopic tube (46). At this time, the spring telescopic tube (46) expands and contracts to push the sealing tube (48) to abut against the end face of the inner wall of the fixed cylinder (41), and the limit spring telescopic rod (415) abuts against the extended spring telescopic tube (46) to temporarily seal the connection part of the two flanges (31).

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