Sealing device for breather valve of oil tank

Abstract

The utility model provides a sealing device for an oil tank breather valve, and relates to the technical field of oil tank breather valve sealing. The sealing device for the oil tank breather valve comprises an oil tank body, a connecting port is formed in the upper end of the oil tank body and is conical, a lower sealing gasket is installed on the inner wall of the connecting port, a sealing cylinder is arranged above the oil tank body and is conical and matched with the connecting port, an upper sealing gasket is installed on the outer ring face of the lower end of the sealing cylinder, and a lower sealing gasket is installed on the lower ring face of the sealing cylinder. The upper sealing gasket makes contact with the lower sealing gasket, a main body valve pipe is installed at the upper end of the sealing cylinder, and a gear ring is arranged on the outer ring side of the main body valve pipe. According to the sealing device for the oil tank breather valve, the connecting port, the upper sealing gasket, the lower sealing gasket and the sealing cylinder are arranged, when the threaded rod is meshed with the threaded cylinder, the sealing cylinder is pushed to move downwards, the upper sealing gasket and the lower sealing gasket on the lower portion are pressed, the conical connecting port and the sealing cylinder can make full contact and be pressed in the downward moving process of the sealing cylinder, and the sealing performance of the sealing device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil tank breathing valve sealing, in particular to a sealing device for an oil tank breathing valve. Background Art

[0002] As one of the safety accessories of storage tanks, the function of the breathing valve is to reduce the evaporation loss of volatile liquids in normal pressure and low pressure storage tanks. The breathing valve can not only maintain the air pressure balance in the tank to ensure that the tank is not damaged when it is overpressured or underpressured, but also use the pressure bearing capacity of the tank itself to reduce the volatilization and loss of the medium in the tank, which plays an important role in safety and environmental protection.

[0003] The valve disc and valve seat of the breathing valve should have a certain sealing ability. Under normal working conditions, when the storage tank outputs materials, the breathing valve starts to inhale air into the tank, and when filling materials into the storage tank, the breathing valve starts to exhale the gas in the tank to the outside of the tank. Due to climate change and other reasons, the vapor pressure of the material in the tank increases or decreases, and the breathing valve exhales steam or inhales air or nitrogen. The existing breathing valve is connected to the oil tank by bolts and tightened, and a sealing gasket is placed at the connection to seal. However, the existing connection is generally in the shape of a circular hole. In order to facilitate the insertion of the inner structure into the hole, the internal structure will be slightly smaller, which results in poor sealing. For this reason, a sealing device for an oil tank breathing valve is proposed. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a sealing device for an oil tank breathing valve, which solves the problems raised in the background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a sealing device for an oil tank breathing valve, comprising an oil tank body, a connecting port is opened at the upper end of the oil tank body, the connecting port is in the shape of a cone, a lower sealing gasket is installed on the inner wall of the connecting port, a sealing cylinder is arranged above the oil tank body, the sealing cylinder is in the shape of a cone adapted to the connecting port, an upper sealing gasket is installed on the outer ring surface of the lower end of the sealing cylinder, the upper sealing gasket is in contact with the lower sealing gasket, a main valve tube is installed at the upper end of the sealing cylinder, a gear ring is arranged on the outer ring side of the main valve tube, a plurality of gears are meshed on the inner ring surface of the gear ring, a threaded rod is fixedly passed through the axis of the upper surface of the gear, a threaded cylinder is threadedly sleeved on one end of the threaded rod located below the gear, and the lower end of the threaded cylinder is installed on the outer surface of the oil tank body.

[0008] Preferably, a reducer A and a reducer B are fixedly passed through the upper surface of the main valve tube, the inner diameter of the upper end of the reducer A is smaller than the inner diameter of the lower end, the inner diameter of the upper end of the reducer B is larger than the inner diameter of the lower end, the large diameter end of the reducer A is slidably connected with a plug A, and a supporting telescopic rod is installed on the bottom surface of the plug A, and the lower end of the supporting telescopic rod is fixed to the inner wall of the main valve tube, the large diameter end of the reducer B is slidably connected with a plug B, and a tension telescopic rod is installed on the bottom surface of the plug B, and the lower end of the tension telescopic rod is fixed to the inner wall of the main valve tube.

[0009] Preferably, the connection between the large diameter end and the small diameter end of the reducer A and the connection between the large diameter end and the small diameter end of the reducer B are both tapered, the maximum outer diameter of the plug A is smaller than the maximum inner diameter of the reducer A and larger than its minimum inner diameter, and the maximum outer diameter of the plug B is smaller than the maximum inner diameter of the reducer B and larger than its minimum inner diameter.

[0010] Preferably, the inner ring surface of the gear ring is concave, the height of the concave structure of the gear ring is equal to the thickness of the gear, and the gear is located inside the concave structure of the gear ring.

[0011] Preferably, a worm gear ring is fixedly sleeved on the outer ring surface of the gear ring, a worm is meshed on the right side of the worm gear ring, a coaxial shaft is rotatably inserted at the axis center of the worm, bent plates are rotatably sleeved on both ends of the concentric shaft, the other end of the bent plate is fixed to the main valve tube, a torsion spring is fixedly sleeved on one end of the worm, the other end of the torsion spring is fixed to the concentric shaft, and the concentric shaft is located on the inner ring side of the torsion spring.

[0012] Preferably, a ratchet is fixedly sleeved at one end of the coaxial shaft, an elastic ratchet tooth is meshed on one side of the ratchet, an edge rod is slidably inserted at the other end of the elastic ratchet tooth, and the other end of the edge rod is fixed to the adjacent bent plate.

[0013] Preferably, the axis of the gear is coaxially arranged with the connected threaded rod, a plurality of gears are arranged, and the plurality of gears are distributed in a circular array around the axis of the gear ring, and the gear ring is coaxially arranged with the sealing cylinder.

[0014] (III) Beneficial effects

[0015] The utility model provides a sealing device for an oil tank breathing valve, which has the following beneficial effects:

[0016] 1. The sealing device for the oil tank breathing valve is provided with a connecting port, an upper sealing gasket, a lower sealing gasket and a sealing cylinder. During installation, the lower sealing gasket and the upper sealing gasket are respectively adhered to the inner part of the connecting port and the outer ring surface of the sealing cylinder, and then the sealing cylinder is inserted into the inner part of the connecting port. When the threaded rod and the threaded cylinder are engaged, the sealing cylinder is pushed to move downward to press the upper sealing gasket and the lower sealing gasket below. When the sealing cylinder moves downward, the conical connecting port and the sealing cylinder can fully contact and press, thereby increasing the sealing performance.

[0017] 2. The sealing device for the oil tank breathing valve is provided with an elastic ratchet, a ratchet and a torsion spring. When it is necessary to drive the threaded rod and the threaded cylinder to be tightened, the coaxial shaft is rotated to drive the ratchet to rotate relative to the elastic ratchet. The concentric shaft drives the worm to rotate through the torsion spring. After the worm is meshed with the worm wheel ring, the gear ring is meshed with the gear to drive the threaded rod to rotate. After the sealing cylinder is pressed against the upper sealing gasket and the lower sealing gasket, the worm wheel ring cannot rotate. The coaxial shaft continues to rotate to drive the torsion spring to twist. The elastic ratchet is meshed with the ratchet to store force for the torsion spring. After the elasticity of the upper sealing gasket and the lower sealing gasket decreases with the increase of use time, the stored force torsion spring can timely drive the worm to rotate and timely drive the sealing cylinder downward to press the upper sealing gasket and the lower sealing gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the connection between the elastic ratchet teeth and the ratchet wheel of the utility model;

[0020] Figure 3 It is a schematic side view of part of the structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the internal structure of the main valve tube of the utility model;

[0022] Figure 5 It is a schematic diagram of the partial structure of the utility model;

[0023] Figure 6 It is a schematic diagram of the partial structure of the utility model.

[0024] In the figure: 1. oil tank body; 2. lower sealing gasket; 3. connecting port; 4. upper sealing gasket; 5. main valve tube; 6. gear; 7. threaded tube; 8. gear ring; 9. sealing tube; 10. threaded rod; 11. reducer A; 12. reducer B; 13. plug A; 14. supporting telescopic rod; 15. tension telescopic rod; 16. plug B; 17. worm gear ring; 18. worm; 19. bent plate; 20. torsion spring; 21. concentric shaft; 22. ratchet; 23. elastic ratchet; 24. rib rod. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The utility model embodiment provides a sealing device for an oil tank breathing valve, such as Figure 1-6 As shown, it includes an oil tank body 1, a connecting port 3 is opened at the upper end of the oil tank body 1, the connecting port 3 is in the shape of a cone, a lower sealing gasket 2 is installed on the inner wall of the connecting port 3, a sealing cylinder 9 is arranged above the oil tank body 1, the sealing cylinder 9 is in the shape of a cone adapted to the connecting port 3, an upper sealing gasket 4 is installed on the outer ring surface of the lower end of the sealing cylinder 9, the upper sealing gasket 4 and the lower sealing gasket 2 and the connecting port 3 and the sealing cylinder 9 can be connected by bonding, the upper sealing gasket 4 is in contact with the lower sealing gasket 2, a main valve tube 5 is installed on the upper end of the sealing cylinder 9, and the conical connecting port 3, the lower sealing gasket 2, the upper sealing gasket 4 and the sealing cylinder 9 can be fully contacted and pressed when pressed.

[0027] A reducer A11 and a reducer B12 are fixedly passed through the upper surface of the main valve tube 5. The inner diameter of the upper end of the reducer A11 is smaller than the inner diameter of the lower end, and the inner diameter of the upper end of the reducer B12 is larger than the inner diameter of the lower end. A plug A13 is slidably inserted into the large-diameter end of the reducer A11, and a supporting telescopic rod 14 is installed on the bottom surface of the plug A13. The lower end of the supporting telescopic rod 14 is fixed to the inner wall of the main valve tube 5. A plug B16 is slidably inserted into the large-diameter end of the reducer B12, and a tension telescopic rod 15 is installed on the bottom surface of the plug B16. The lower end of the tension telescopic rod 15 is fixed to the inner wall of the main valve tube 5. The connection between the large diameter end and the small diameter end and the connection between the large diameter end and the small diameter end of the reducer B12 are both tapered. The maximum outer diameter of the plug A13 is smaller than the maximum inner diameter of the reducer A11 and larger than its minimum inner diameter. The maximum outer diameter of the plug B16 is smaller than the maximum inner diameter of the reducer B12 and larger than its minimum inner diameter. When the pressure inside the oil tank body 1 increases, the plug B16 is pushed to move upward to stretch the tension telescopic rod 15 so that the internal air pressure of the oil tank body 1 can be released. When the internal air pressure of the oil tank body 1 decreases, the plug A13 is pulled downward to compress the support telescopic rod 14 so that external gas can enter the interior of the oil tank body 1.

[0028] A gear ring 8 is arranged on the outer ring side of the main valve tube 5, and a plurality of gears 6 are meshed on the inner ring surface of the gear ring 8. The inner ring surface of the gear ring 8 is concave, and the concave height of the gear ring 8 is equal to the thickness of the gear 6. The gear 6 is located inside the concave structure of the gear ring 8, and a threaded rod 10 is fixedly penetrated through the axis of the upper surface of the gear 6. The axis of the gear 6 is coaxially arranged with the connected threaded rod 10. A plurality of gears 6 are arranged, and the plurality of gears 6 are distributed in a circular array around the axis of the gear ring 8. The gear ring 8 is coaxially arranged with the sealing tube 9, and a threaded tube 7 is threadedly sleeved on one end of the threaded rod 10 located below the gear 6. When the gear ring 8 rotates, it can drive the plurality of threaded rods 10 to rotate synchronously by meshing with the plurality of gears 6, so that the sealing tube 9 moves downward evenly on all sides to ensure that the sealing tube 9 does not tilt when moving downward. The lower end of the threaded tube 7 is installed on the outer surface of the oil tank body 1.

[0029] The outer ring surface of the gear ring 8 is fixedly sleeved with a worm wheel ring 17, and a worm 18 is meshed on the right side of the worm wheel ring 17. A concentric shaft 21 is rotatably inserted at the axis of the worm 18, and both ends of the concentric shaft 21 are rotatably sleeved with a bent plate 19, and the other end of the bent plate 19 is fixed to the main valve tube 5. A torsion spring 20 is fixedly sleeved at one end of the worm 18, and the other end of the torsion spring 20 is fixed to the concentric shaft 21. The concentric shaft 21 is located on the inner ring side of the torsion spring 20, and a ratchet 22 is fixedly sleeved at one end of the concentric shaft 21. An elastic ratchet 23 is meshed on one side of the ratchet 22, and a ridge rod 24 is slidably inserted at the other end of the elastic ratchet 23. The other end is fixed to the adjacent bent plate 19. By changing the position of the elastic ratchet 23 on the rib rod 24, it is possible to control whether the elastic ratchet 23 is engaged with the ratchet 22. When the elastic ratchet 23 is engaged with the ratchet 22, the concentric shaft 21 can only rotate in one direction. After the sealing tube 9 presses the upper sealing gasket 4 and the lower sealing gasket 2, the concentric shaft 21 continues to rotate, driving the torsion spring 20 to twist. After the elasticity of the upper sealing gasket 4 and the lower sealing gasket 2 decreases and becomes thinner with increasing use time, the force-accumulating torsion spring 20 can promptly drive the worm 18 to rotate, and promptly drive the sealing tube 9 downward to press the upper sealing gasket 4 and the lower sealing gasket 2.

[0030] Working principle: During installation, the lower sealing gasket 2 and the upper sealing gasket 4 are respectively adhered to the inner part of the connection port 3 and the outer ring surface of the sealing tube 9, and then the sealing tube 9 is inserted into the inner part of the connection port 3, so that the elastic ratchet teeth 23 are meshed with the ratchet wheel 22, and the coaxial shaft 21 is rotated to drive the worm 18 to rotate through the torsion spring 20. After the worm 18 is meshed with the worm wheel ring 17, the gear ring 8 is meshed with the gear 6 to drive the threaded rod 10 to rotate. When the threaded rod 10 is meshed with the threaded tube 7, the sealing tube 9 is pushed downward to press the upper sealing gasket 4 and the lower sealing gasket 2 below, forming a cone. When the sealing tube 9 moves downward, the connecting port 3 and the sealing tube 9 can fully contact and press together to increase the sealing performance. After the sealing tube 9 presses the upper sealing gasket 4 and the lower sealing gasket 2, the worm ring 17 cannot rotate, and the concentric shaft 21 continues to rotate, driving the torsion spring 20 to twist. The elastic ratchet teeth 23 store force for the torsion spring 20 by engaging with the ratchet wheel 22. After the elasticity of the upper sealing gasket 4 and the lower sealing gasket 2 decreases with the increase of usage time, the stored force torsion spring 20 can promptly drive the worm 18 to rotate, and promptly drive the sealing tube 9 downward to press the upper sealing gasket 4 and the lower sealing gasket 2.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing device for an oil tank breathing valve, comprising an oil tank body (1), characterized in that: The oil tank body (1) is provided with a connection port (3) at the upper end thereof. The connection port (3) is in a conical shape. A lower sealing gasket (2) is installed on the inner wall of the connection port (3). A sealing cylinder (9) is provided above the oil tank body (1). The sealing cylinder (9) is in a conical shape matching the connection port (3). An upper sealing gasket (4) is installed on the outer ring surface of the lower end of the sealing cylinder (9). The upper sealing gasket (4) contacts the lower sealing gasket (2). A main valve tube (5) is installed at the upper end of the sealing cylinder (9). A gear ring (8) is provided on the outer ring side of the main valve tube (5). A plurality of gears (6) are meshed on the inner ring surface of the gear ring (8). A threaded rod (10) is fixedly passed through the axis of the upper surface of the gear (6). A threaded cylinder (7) is threadedly sleeved on one end of the threaded rod (10) located below the gear (6). The lower end of the threaded cylinder (7) is installed on the outer surface of the oil tank body (1).

2. A sealing device for an oil tank breathing valve according to claim 1, characterized in that: A reducer A (11) and a reducer B (12) are fixedly passed through the upper surface of the main valve tube (5); the inner diameter of the upper end of the reducer A (11) is smaller than the inner diameter of the lower end, and the inner diameter of the upper end of the reducer B (12) is larger than the inner diameter of the lower end; a plug A (13) is slidably inserted into the large-diameter end of the reducer A (11); a supporting telescopic rod (14) is installed on the bottom surface of the plug A (13); the lower end of the supporting telescopic rod (14) is fixed to the inner wall of the main valve tube (5); a plug B (16) is slidably inserted into the large-diameter end of the reducer B (12); a tension telescopic rod (15) is installed on the bottom surface of the plug B (16); the lower end of the tension telescopic rod (15) is fixed to the inner wall of the main valve tube (5).

3. A sealing device for an oil tank breathing valve according to claim 2, characterized in that: The connection between the large diameter end and the small diameter end of the reducer A (11) and the connection between the large diameter end and the small diameter end of the reducer B (12) are both tapered, the maximum outer diameter of the plug A (13) is smaller than the maximum inner diameter of the reducer A (11) and larger than its minimum inner diameter, and the maximum outer diameter of the plug B (16) is smaller than the maximum inner diameter of the reducer B (12) and larger than its minimum inner diameter.

4. A sealing device for an oil tank breathing valve according to claim 1, characterized in that: The inner ring surface of the gear ring (8) is concave, the height of the concave structure of the gear ring (8) is equal to the thickness of the gear (6), and the gear (6) is located inside the concave structure of the gear ring (8).

5. The sealing device for an oil tank breathing valve according to claim 1, characterized in that: The outer ring surface of the gear ring (8) is fixedly sleeved with a worm wheel ring (17), the right side of the worm wheel ring (17) is meshed with a worm (18), a coaxial shaft (21) is rotatably inserted at the axis of the worm (18), both ends of the concentric shaft (21) are rotatably sleeved with bent plates (19), the other end of the bent plate (19) is fixed to the main valve tube (5), one end of the worm (18) is fixedly sleeved with a torsion spring (20), the other end of the torsion spring (20) is fixed to the concentric shaft (21), and the concentric shaft (21) is located on the inner ring side of the torsion spring (20).

6. A sealing device for an oil tank breathing valve according to claim 5, characterized in that: A ratchet (22) is fixedly sleeved on one end of the coaxial shaft (21), an elastic ratchet tooth (23) is meshed on one side of the ratchet (22), a ridge rod (24) is slidably inserted on the other end of the elastic ratchet tooth (23), and the other end of the ridge rod (24) is fixed to an adjacent bent plate (19).

7. A sealing device for an oil tank breathing valve according to claim 1, characterized in that: The axis of the gear (6) is coaxially arranged with the connected threaded rod (10), a plurality of gears (6) are arranged, and the plurality of gears (6) are distributed in a circular array around the axis of the gear ring (8), and the gear ring (8) is coaxially arranged with the sealing cylinder (9).

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