Sealing structure of stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to a stop valve sealing structure which comprises a valve body and a mounting pipe. A fixing pipe is arranged on the valve body, and the mounting pipe is connected with the fixing pipe in a matched mode and is coaxially distributed with the fixing pipe. A valve rod is slidably arranged on the fixing pipe and coaxially distributed with the fixing pipe, a valve clack is arranged at the lower end of the valve rod, a cut-off portion is arranged in the valve body, a through hole is formed in the cut-off portion, and the valve clack is connected with the through hole in a matched mode. The mounting pipe is rotatably provided with a mounting part, the mounting part is provided with a nut, the valve rod is in threaded fit connection with the nut, and the mounting part is provided with a hand wheel; and a sealing part is arranged in the mounting pipe and is pressed on the peripheral surface of the valve rod. In the embodiment, the inner circumferential surface of the mounting pipe is tightly pressed on the outer circumferential surface of the sealing part, and the inner circumferential surface of the sealing part is tightly pressed on the outer circumferential surface of the valve rod, so that liquid in the valve body cannot permeate into threads; the mounting pipe is convenient to dismount and mount, the sealing part is convenient to replace, and the service life of the stop valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to a stop valve sealing structure. Background Art

[0002] The stop valve, also known as the gate valve, is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage. The opening and closing parts of the stop valve are plug-shaped valve discs, and the sealing surface is a flat surface or a sea cone surface. The valve disc moves linearly along the center line of the valve seat. The valve stem of this type of valve has a relatively short opening or closing stroke and has a very reliable shut-off function. Since the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for regulating flow.

[0003] A Chinese patent with announcement number CN117739129A discloses a sealed stop valve, which includes a stop valve body, a valve cavity is provided inside the stop valve body, symmetrical drainage pipes are connected on both sides of the valve cavity, a symmetrical first drainage plate and a second drainage plate are provided in the valve cavity between the drainage pipes, a first stop plate is fixedly connected between the first drainage plate and the second drainage plate, a first flow hole is penetrated at the center position of the top of the first stop plate, a first drainage hole is penetrated on the second drainage plate above the first stop plate, a second drainage hole is penetrated on the first drainage plate below the first stop plate, a connecting hole is penetrated at the center position of the top of the stop valve body above the first stop plate, the connecting hole is communicated with the valve cavity, a second stop plate is provided in the connecting hole, a second flow hole is penetrated at the center position of the top of the second stop plate, a connecting pipe is connected to the top of the connecting hole, and a sealing component is provided in the connecting pipe.

[0004] However, the above technical solution has the following defects: when the valve disc of the above sealed stop valve is opened, the liquid in the valve body will penetrate into the connecting pipe, the sealing effect at the valve stem of the stop valve is poor, the transmission of the thread and the thread groove on the valve stem is blocked, and the service life of the stop valve is reduced. Utility Model Content

[0005] The utility model aims to provide a stop valve sealing structure in view of the problems existing in the background technology.

[0006] The technical solution of the utility model: a stop valve sealing structure, including a valve body and a mounting pipe;

[0007] The valve body is provided with a fixed pipe, and the installation pipe is connected with the fixed pipe and coaxially distributed with the fixed pipe;

[0008] The fixed pipe is slidably provided with a valve stem and is coaxially distributed with the fixed pipe, a valve disc is provided at the lower end of the valve stem, a cut-off portion is provided in the valve body, a through hole is provided on the cut-off portion, and the valve disc is matched and connected with the through hole;

[0009] The mounting tube is rotatably provided with a mounting part, the mounting part is provided with a nut, the valve stem is threadedly connected with the nut, and a hand wheel is provided on the mounting part;

[0010] A sealing portion is arranged in the installation tube, and the sealing portion is pressed tightly against the outer peripheral surface of the valve stem.

[0011] Preferably, a partition plate is provided in the installation tube, the sealing portion is located below the partition plate, and the valve stem is provided with threads, which are located above the partition plate;

[0012] A limit plate is arranged in the fixed tube, and the valve stem is slidably connected to the limit plate. In the installed state, the limit plate and the partition plate are pressed tightly at both ends of the sealing part. A plurality of sealing rings are arranged on the inner circumference of the sealing part, and the sealing rings are all pressed tightly on the outer circumference of the valve stem.

[0013] Preferably, the inner circumference of the installation tube is pressed tightly against the outer circumference of the sealing portion, and the sealing portion has a certain elasticity.

[0014] Preferably, a protrusion is provided on the outer peripheral surface of the valve stem, and a groove is provided on the limiting plate, and the protrusion is slidably fitted in connection with the groove.

[0015] Preferably, an annular groove is provided on the inner circumference of the mounting tube, and a convex ring is provided on the outer circumference of the mounting portion, and the convex ring is connected to the annular groove in a sliding fit.

[0016] Preferably, it also includes a bolt;

[0017] The ends of the installation pipe and the fixing pipe close to each other are both provided with fixing rings, and the bolt passes through one fixing ring and is thread-matched with the other fixing ring for connection.

[0018] Preferably, a sealing gasket is provided at one end of the fixing tube close to the mounting tube and is coaxially distributed with the fixing tube, and the end of the mounting tube is pressed tightly against the sealing gasket.

[0019] Preferably, the valve flap is truncated cone-shaped, and the outer peripheral surface of the valve flap is pressed against the inner wall of the through hole.

[0020] Compared with the prior art, the above technical solution of the utility model has the following beneficial technical effects:

[0021] 1. In this embodiment, during installation, the valve stem is slidably connected to the limit plate, the sealing part is placed in the installation tube, the installation tube sleeve is set on the valve stem, the nut is matched with the thread on the valve stem, and after the installation of the installation tube and the fixed tube is completed, the limit plate and the partition plate are pressed tightly at both ends of the sealing part, the inner circumference of the installation tube is pressed tightly against the outer circumference of the sealing part, and the inner circumference of the sealing part is pressed tightly against the outer circumference of the valve stem, so that the liquid in the valve body cannot penetrate into the thread, which increases the service life of the stop valve.

[0022] 2. In this embodiment, the fixing ring on the mounting tube is connected to the fixing ring on the fixed tube by a plurality of bolts, a sealing gasket is provided between the mounting tube and the fixed tube, the mounting tube and the fixed tube compress the sealing gasket, the mounting tube is convenient for disassembly and installation, and also convenient for replacement of the sealing part, thereby increasing the service life of the stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a three-dimensional diagram of an embodiment of the present invention.

[0024] Figure 2 The utility model is a structural schematic diagram of a stop valve sealing structure.

[0025] Figure 3 The utility model is a cross-sectional view of a stop valve sealing structure.

[0026] Figure numerals: 1. valve body; 2. mounting tube; 3. fixing tube; 4. fixing ring; 5. handwheel; 6. valve stem; 7. nut; 8. mounting part; 9. stop part; 10. valve disc; 11. convex ring; 12. thread; 13. bolt; 14. sealing part; 15. sealing ring; 16. partition plate; 17. limit plate; 18. sealing gasket; 19. bump. DETAILED DESCRIPTION

[0027] Embodiment 1

[0028] like Figure 1-Figure 3 As shown, a stop valve sealing structure proposed by the utility model includes a valve body 1 and a mounting pipe 2;

[0029] A fixing pipe 3 is provided on the valve body 1, and the installation pipe 2 is connected with the fixing pipe 3 and coaxially distributed with the fixing pipe 3;

[0030] The fixed pipe 3 is slidably provided with a valve stem 6 and is coaxially distributed with the fixed pipe 3. A valve flap 10 is provided at the lower end of the valve stem 6. A cut-off portion 9 is provided in the valve body 1. A through hole is provided on the cut-off portion 9. The valve flap 10 is matched and connected with the through hole.

[0031] Furthermore, the valve flap 10 is truncated cone-shaped, and the outer peripheral surface of the valve flap 10 is pressed tightly against the inner wall of the through hole;

[0032] The mounting tube 2 is rotatably provided with a mounting portion 8, the mounting portion 8 is provided with a nut 7, the valve stem 6 is threadedly connected with the nut 7, and the mounting portion 8 is provided with a hand wheel 5;

[0033] Furthermore, an annular groove is provided on the inner circumference of the mounting tube 2, and a convex ring 11 is provided on the outer circumference of the mounting portion 8, and the convex ring 11 is slidably connected with the annular groove;

[0034] A sealing portion 14 is provided in the mounting tube 2 , and the sealing portion 14 is pressed tightly against the outer peripheral surface of the valve stem 6 .

[0035] In the utility model, rotating the hand wheel 5 drives the mounting portion 8 and the nut 7 to rotate, the valve stem 6 is threadedly connected with the nut 7, the valve stem 6 slides in the fixed tube 3, and the valve stem 6 drives the valve disc 10 away from or close to the cut-off portion 9, so as to open or close the cut-off valve, the mounting tube 2 and the fixed tube 3 are detachably connected, and a sealing portion 14 is provided in the mounting tube 2 to make the sealing at the valve stem 6 better; in the utility model, the mounting tube 2 can be removed from the fixed tube 3, so as to facilitate the replacement of the internal sealing portion 14 and increase the service life of the cut-off valve.

[0036] Embodiment 2

[0037] like Figure 1-Figure 2 As shown, a stop valve sealing structure proposed by the utility model, compared with the first embodiment, in this embodiment, a partition plate 16 is provided in the mounting tube 2, the sealing portion 14 is located below the partition plate 16, and a thread 12 is provided on the valve stem 6, and the thread 12 is located above the partition plate 16;

[0038] A limit plate 17 is provided in the fixed tube 3, and the valve stem 6 is slidably connected to the limit plate 17. In the installed state, the limit plate 17 and the partition plate 16 are pressed tightly against the two ends of the sealing part 14. A plurality of sealing rings 15 are provided on the inner circumference of the sealing part 14, and the sealing rings 15 are all pressed tightly against the outer circumference of the valve stem 6.

[0039] Furthermore, the inner circumference of the installation tube 2 is pressed tightly against the outer circumference of the sealing portion 14, and the sealing portion 14 has a certain elasticity.

[0040] Furthermore, a protrusion 19 is provided on the outer circumferential surface of the valve stem 6, and a groove is provided on the limiting plate 17, and the protrusion 19 is connected to the groove in a sliding fit.

[0041] In this embodiment, during installation, the valve stem 6 is slidably connected to the limit plate 17, and the sealing part 14 is placed in the mounting tube 2. The mounting tube 2 is sleeved on the valve stem 6, and the nut 7 is matched with the thread 12 on the valve stem 6. After the mounting tube 2 and the fixed tube 3 are installed, the limit plate 17 and the partition plate 16 are pressed against the two ends of the sealing part 14, and the inner circumference of the mounting tube 2 is pressed against the outer circumference of the sealing part 14. The inner circumference of the sealing part 14 is pressed against the outer circumference of the valve stem 6, so that the liquid in the valve body 1 cannot penetrate into the thread 12, which increases the service life of the stop valve.

[0042] Embodiment 3

[0043] like Figure 1-Figure 2 As shown, the stop valve sealing structure proposed by the present invention, compared with the first embodiment, the present embodiment further includes a bolt 13;

[0044] The ends of the installation pipe 2 and the fixing pipe 3 that are close to each other are both provided with fixing rings 4 , and a plurality of bolts 13 are provided. The bolts 13 pass through one fixing ring 4 and are threadedly connected with another fixing ring 4 .

[0045] Furthermore, a sealing gasket 18 is provided at one end of the fixing tube 3 close to the mounting tube 2 and is coaxially distributed with the fixing tube 3 , and the end of the mounting tube 2 is pressed tightly against the sealing gasket 18 .

[0046] In this embodiment, the fixing ring 4 on the mounting tube 2 is connected to the fixing ring 4 on the fixing tube 3 by means of a plurality of bolts 13, a sealing gasket 18 is provided between the mounting tube 2 and the fixing tube 3, the mounting tube 2 and the fixing tube 3 compress the sealing gasket 18, the mounting tube 2 is convenient for disassembly and installation, and the sealing part 14 is convenient for replacement, thereby increasing the service life of the stop valve.

[0047] The implementation modes of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A stop valve sealing structure, characterized in that: It comprises a valve body (1) and a mounting pipe (2); A fixed pipe (3) is provided on the valve body (1), and the installation pipe (2) is cooperatively connected to the fixed pipe (3) and is coaxially distributed with the fixed pipe (3); The fixed tube (3) is slidably provided with a valve stem (6) and is coaxially distributed with the fixed tube (3); a valve flap (10) is provided at the lower end of the valve stem (6); a stop portion (9) is provided in the valve body (1); a through hole is provided on the stop portion (9); and the valve flap (10) is cooperatively connected with the through hole; The mounting tube (2) is rotatably provided with a mounting portion (8), the mounting portion (8) is provided with a nut (7), the valve stem (6) is threadedly connected to the nut (7), and a hand wheel (5) is provided on the mounting portion (8); A sealing portion (14) is provided in the mounting tube (2), and the sealing portion (14) is pressed tightly against the outer peripheral surface of the valve stem (6).

2. A stop valve sealing structure according to claim 1, characterized in that: A partition plate (16) is provided in the mounting tube (2), the sealing portion (14) is located below the partition plate (16), and a thread (12) is provided on the valve stem (6), and the thread (12) is located above the partition plate (16); A limit plate (17) is provided in the fixed tube (3), and the valve stem (6) is slidably connected to the limit plate (17). In the installed state, the limit plate (17) and the partition plate (16) are pressed against the two ends of the sealing part (14). A plurality of sealing rings (15) are provided on the inner circumference of the sealing part (14), and the sealing rings (15) are all pressed against the outer circumference of the valve stem (6).

3. A stop valve sealing structure according to claim 2, characterized in that: The inner circumference of the mounting tube (2) is pressed tightly against the outer circumference of the sealing portion (14), and the sealing portion (14) has a certain elasticity.

4. A stop valve sealing structure according to claim 2, characterized in that: The outer peripheral surface of the valve stem (6) is provided with a protrusion (19), the limiting plate (17) is provided with a groove, and the protrusion (19) is connected to the groove in a sliding manner.

5. A stop valve sealing structure according to claim 1, characterized in that: The inner circumference of the mounting tube (2) is provided with an annular groove, and the outer circumference of the mounting portion (8) is provided with a convex ring (11), which is connected to the annular groove in a sliding manner.

6. A stop valve sealing structure according to claim 1, characterized in that: Also includes a bolt (13); The ends of the installation tube (2) and the fixing tube (3) close to each other are both provided with fixing rings (4), and the bolt (13) passes through one fixing ring (4) and is threadedly connected with the other fixing ring (4).

7. A stop valve sealing structure according to claim 1, characterized in that: A sealing gasket (18) is provided at one end of the fixed tube (3) close to the installation tube (2) and is coaxially distributed with the fixed tube (3), and the end of the installation tube (2) is pressed tightly against the sealing gasket (18).

8. A stop valve sealing structure according to claim 1, characterized in that: The valve flap (10) is in the shape of a truncated cone, and the outer peripheral surface of the valve flap (10) is pressed tightly against the inner wall of the through hole.

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