阅读说明：本技术 一种防泄露的呼吸阀 (Leakage-proof breather valve ) 是由 王尧林 徐顺和 诸悦 吴海明 孙莹 于 2020-07-03 设计创作，主要内容包括：本发明属于呼吸阀技术领域,尤其涉及一种防泄露的呼吸阀,它包括呼吸阀本体,本发明设计的呼吸阀,只有当油罐倾翻到大于20度时,配重块、安装杆和安装底座组成的结构才会倾倒,带动架体和密封板摆动,使得密封板上所开的第二气孔与密封盖上所开的第一气孔相互一一对应错位,使得安装套筒与呼吸阀本体之间的通道关闭,起到防泄漏的效果；而当油罐的倾角小于20度时,因安装底座大于配重块和安装杆在安装底座上的投影面积,所以配重块、安装杆和安装底座组成的结构不会倾倒。本发明设计的呼吸阀,在不需要防泄露机构的时候,按下齿条,然后通过上锁螺栓、齿条上所开的第二锁孔和导向套上所开的第一锁孔将齿条固定在安装壳上。(The invention belongs to the technical field of breather valves, and particularly relates to a breather valve capable of preventing leakage, which comprises a breather valve body, wherein only when an oil tank is tilted to a temperature greater than 20 ℃, a structure consisting of a balancing weight, an installation rod and an installation base can be tilted to drive a frame body and a sealing plate to swing, so that second air holes formed in the sealing plate and first air holes formed in a sealing cover are correspondingly staggered one by one, a channel between an installation sleeve and the breather valve body is closed, and a leakage-preventing effect is achieved; and when the inclination angle of the oil tank is less than 20 degrees, the installation base is larger than the projection area of the balancing weight and the installation rod on the installation base, so that the structure formed by the balancing weight, the installation rod and the installation base cannot topple over. According to the breather valve designed by the invention, when the anti-leakage mechanism is not needed, the rack is pressed down, and then the rack is fixed on the mounting shell through the locking bolt, the second lock hole formed in the rack and the first lock hole formed in the guide sleeve.)

1. The utility model provides a prevent breather valve of leakage, it includes the breather valve body, its characterized in that: also comprises an anti-leakage mechanism;

the anti-leakage mechanism comprises a reset mechanism, an installation sleeve, a sealing plate and a frame body, wherein the lower end of the installation sleeve is installed at an oil port of the oil tank, and the breather valve is installed at the upper end of the installation sleeve; the inner circle surface of the upper end of the mounting sleeve is fixedly provided with a sealing cover, the sealing cover is provided with an inner sphere surface and an outer sphere surface, and the inner sphere surface and the outer sphere surface of the sealing cover are provided with first air holes which are uniformly distributed and run through; the lower end of the frame body is arranged in the mounting sleeve through a universal joint, and the upper end of the frame body is fixedly provided with a sealing plate; the sealing plate is positioned in the mounting sleeve and is provided with an inner spherical surface and an outer spherical surface, and the outer spherical surface of the sealing plate is tightly attached to the inner spherical surface of the sealing cover; the inner spherical surface and the outer spherical surface of the sealing plate are provided with second air holes which are uniformly distributed and communicated, and the second air holes on the sealing plate and the first air holes on the sealing cover are correspondingly matched with each other; the reset mechanism is arranged at the lower end of the mounting sleeve and plays a reset role in the swinging of the frame body;

the inner circular surface of the mounting sleeve is provided with a mounting ring groove, and two through square holes are formed at two ends of the mounting shell; the mounting shell is fixedly mounted on the outer circular surface of the mounting sleeve, and the mounting shell is communicated with the inner side of the mounting sleeve;

the reset mechanism comprises a rack, a gear ring and pull ropes, wherein the gear ring is rotatably arranged in a mounting ring groove formed in the mounting sleeve, and a plurality of pull ropes are uniformly arranged between the inner circular surface of the gear ring and the outer circular surface of the frame body in the circumferential direction; the rack is slidably arranged in the mounting shell and is matched with two square holes formed in the mounting shell; a return spring is arranged between the rack and the inner end surface of the mounting shell, and the rack controls the gear ring to rotate through the transmission of the gear;

when the oil tank is turned over to be greater than 20 degrees, the support body swings relative to the mounting sleeve under the action of the turning force, the support body swings to drive the sealing plate mounted on the support body to swing, the second air hole formed in the sealing plate and the first air hole formed in the sealing cover are correspondingly staggered one by one, the channel between the mounting sleeve and the breather valve body is closed, and the anti-leakage effect is achieved.

2. A leak-proof breather valve according to claim 1, wherein: the upper end and the lower end of the mounting sleeve of the leakage-proof mechanism are respectively provided with a flange plate, the flange plate at the lower end is fixedly mounted at an oil tank oil port through bolts, and the flange plate at the upper end is fixedly connected with an inlet at the lower end of the breather valve body through bolts.

3. A leak-proof breather valve according to claim 1, wherein: the upper end of the fixed shell is an opening end, and the lower end of the fixed shell is detachably arranged in the mounting sleeve through a support frame and is positioned at the lower end of the mounting sleeve; the lower end of the mounting rod is detachably provided with a mounting base, and the mounting base is placed in the fixed shell; the upper end of the mounting rod is fixedly provided with a balancing weight which is positioned at the upper side of the universal joint; the upper end fixed mounting of telescopic link is on the interior sphere of closing plate, and the lower extreme of telescopic link passes through the ball pivot to be connected with the upper end of balancing weight, the set casing is located the downside of universal joint, and the installation pole passes the center of universal joint.

4. A leak-proof breather valve according to claim 1, wherein: two ends of the fixed shaft are rotatably arranged on the upper end surface and the lower end surface in the mounting shell; the first gear is fixedly arranged on the fixed shaft, the rack is meshed with the first gear, and the first gear is meshed with the gear ring.

5. A leak-proof breather valve according to claim 1, wherein: two ends of the fixed shaft are rotatably arranged on the upper end surface and the lower end surface in the mounting shell; the first gear and the second gear are respectively and fixedly arranged at two ends of the fixed shaft, the diameter of the first gear is 3 times that of the second gear, the rack is meshed with the second gear, and the first gear is meshed with the gear ring.

6. A leak-proof breather valve according to claim 1, wherein: the two guide plates are symmetrically and fixedly installed in the installation shell, and the two guide plates are respectively positioned on the upper side and the lower side of the reset spring.

7. A leak-proof breather valve according to claim 1, wherein: and a spring fixing plate is arranged on the rack, one end of a return spring is fixedly arranged on the spring fixing plate, and the other end of the return spring is fixedly arranged on the inner end surface of the sliding groove.

8. A leak-proof breather valve according to claim 2, wherein: the upper end of the telescopic rod is fixedly arranged on the sealing disc in a welding mode.

9. A leak-proof breather valve according to claim 1, wherein: the upper end surface of the guide sleeve is provided with a first lock hole, the inner circular surface of the first lock hole is provided with an internal thread, the guide sleeve is arranged on the mounting shell, and the guide sleeve is aligned with one square hole of two square holes formed in the mounting shell; a second lock hole is formed in one end, located on the outer side of the mounting shell and the mounting sleeve, of the rack, an internal thread is formed in the inner circular surface of the second lock hole, and the second lock hole is matched with the first lock hole;

when the leakage-proof function of the leakage-proof mechanism is not needed, the rack is pressed down, and then the rack is fixed on the mounting shell through the locking bolt, the second lock hole formed in the rack and the first lock hole formed in the guide sleeve.

10. A leak-proof breather valve according to claim 2, wherein: the lower end of the mounting rod is fixed with the mounting base through a bolt; when the position of the stay cord arranged on the inner circle surface of the gear ring and the position of the same stay cord arranged on the outer circle surface of the frame body are connected and pass through the circle center of the gear ring, the stay cord is in a loose state.

Technical Field

The invention belongs to the technical field of breather valves, and particularly relates to a leak-proof breather valve.

Background

The breather valve consists of a pressure valve and a vacuum valve, is arranged on the air permeability pipe of the storage tank, and can be automatically opened and closed along with the change of positive pressure and negative pressure of oil gas in the storage tank, so that the pressure difference between the inside and the outside of the storage tank is kept within an allowable value range.

The breather valve is a safe and energy-saving product for maintaining the air pressure balance of the storage tank and reducing the volatilization of media, the breather valve fully utilizes the bearing capacity of the storage tank to reduce the discharge of the media, and the principle of the breather valve is to utilize the weight of a positive-negative pressure valve disc to control the positive exhaust pressure and the negative suction pressure of the storage tank. When the pressure of the medium in the tank is within the control operation pressure range of the breather valve, the breather valve does not work, and the airtightness of the oil tank is kept; when the medium is supplemented into the tank, the pressure of the upper gas space in the tank is raised, and the positive pressure of the operation of the breather valve is reached, the pressure valve is opened, and the gas escapes from the breather valve, so that the pressure in the tank is not increased any more; when the medium is pumped out of the tank, the pressure of the upper gas space in the tank is reduced, and the operation negative pressure of the breather valve is reached, the negative pressure valve disc of the top breather valve is pushed open by the atmosphere outside the tank, so that the external gas enters the tank, the pressure in the tank is not reduced any more, the pressure inside the tank is balanced with the pressure outside the tank, and the safety device of the storage tank is protected.

When the oil tank is dumped, the breather valve can leak due to the fact that the breather valve cannot bear oil pressure, and therefore the breather valve needs to be sealed; in the prior art, a copper semicircular weight is arranged at the bottom of a valve, and is positioned at the bottom of the valve under normal conditions; when the valve is tipped over, the weight turns over under the action of weight to seal the valve port; however, the technology is suitable for the situation that the tank is tilted over at a large angle, generally more than 30 degrees; for the risks of small-angle tipping in reality, such as when a fully loaded oil tank truck goes up and down a slope or the tipping angle of a side slope is more than 20 degrees and less than 30 degrees, and when the tipping angle of the oil tank which is static and filled with oil on the ground is more than 20 degrees and less than 30 degrees after the ground is collapsed, the existing anti-leakage technology cannot meet the anti-leakage requirement in the state, so that the design of the breather valve which can seal and prevent leakage in small-angle tipping is necessary.

The invention designs an anti-leakage breather valve to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a leakage-proof breather valve which is realized by adopting the following technical scheme.

The utility model provides a prevent breather valve of leakage, it includes the breather valve body, its characterized in that: also included is an anti-leak mechanism.

The anti-leakage mechanism comprises a reset mechanism, an installation sleeve, a sealing plate and a frame body, wherein the lower end of the installation sleeve is installed at an oil port of the oil tank, and the breather valve is installed at the upper end of the installation sleeve; the inner circle surface of the upper end of the mounting sleeve is fixedly provided with a sealing cover, the sealing cover is provided with an inner sphere surface and an outer sphere surface, and the inner sphere surface and the outer sphere surface of the sealing cover are provided with first air holes which are uniformly distributed and run through; the lower end of the frame body is arranged in the mounting sleeve through a universal joint, and the upper end of the frame body is fixedly provided with a sealing plate; the sealing plate is positioned in the mounting sleeve and is provided with an inner spherical surface and an outer spherical surface, and the outer spherical surface of the sealing plate is tightly attached to the inner spherical surface of the sealing cover; the inner spherical surface and the outer spherical surface of the sealing plate are provided with second air holes which are uniformly distributed and communicated, and the second air holes on the sealing plate and the first air holes on the sealing cover are correspondingly matched with each other; the resetting mechanism is arranged at the lower end of the mounting sleeve and plays a resetting role in the swinging of the frame body.

The inner circular surface of the mounting sleeve is provided with a mounting ring groove, and two through square holes are formed at two ends of the mounting shell; the mounting shell is fixedly mounted on the outer circular surface of the mounting sleeve, and the mounting shell is communicated with the inner side of the mounting sleeve.

The reset mechanism comprises a rack, a gear ring and pull ropes, wherein the gear ring is rotatably arranged in a mounting ring groove formed in the mounting sleeve, and a plurality of pull ropes are uniformly arranged between the inner circular surface of the gear ring and the outer circular surface of the frame body in the circumferential direction; the rack is slidably arranged in the mounting shell and is matched with two square holes formed in the mounting shell; and a return spring is arranged between the rack and the inner end surface of the mounting shell, and the rack controls the gear ring to rotate through the transmission of the gear.

When the oil tank is turned over to be greater than 20 degrees, the support body swings relative to the mounting sleeve under the action of the turning force, the support body swings to drive the sealing plate mounted on the support body to swing, the second air hole formed in the sealing plate and the first air hole formed in the sealing cover are correspondingly staggered one by one, the channel between the mounting sleeve and the breather valve body is closed, and the anti-leakage effect is achieved.

As a further improvement of the technology, the leakage-proof mechanism is characterized in that the upper end and the lower end of the mounting sleeve are respectively provided with a flange, the flange at the lower end is fixedly mounted at an oil tank oil port through a bolt, and the flange at the upper end is fixedly connected with an inlet at the lower end of the breather valve body through a bolt.

As a further improvement of the technology, the upper end of the fixed shell is an open end, and the lower end of the fixed shell is detachably mounted in the mounting sleeve through a support frame and is positioned at the lower end of the mounting sleeve; the lower end of the mounting rod is detachably provided with a mounting base, and the mounting base is placed in the fixed shell; the upper end of the mounting rod is fixedly provided with a balancing weight which is positioned at the upper side of the universal joint; the upper end fixed mounting of telescopic link is on the interior sphere of closing plate, and the lower extreme of telescopic link passes through the ball pivot to be connected with the upper end of balancing weight, the set casing is located the downside of universal joint, and the installation pole passes the center of universal joint.

As a further improvement of the technology, two ends of the fixed shaft are rotatably arranged on the upper end surface and the lower end surface in the mounting shell; the first gear is fixedly arranged on the fixed shaft, the rack is meshed with the first gear, and the first gear is meshed with the gear ring.

As a further improvement of the technology, two ends of the fixed shaft are rotatably arranged on the upper end surface and the lower end surface in the mounting shell; the first gear and the second gear are respectively and fixedly arranged at two ends of the fixed shaft, the diameter of the first gear is 3 times that of the second gear, the rack is meshed with the second gear, and the first gear is meshed with the gear ring.

As a further improvement of the technology, the two guide plates are symmetrically and fixedly installed in the installation shell, and the two guide plates are respectively positioned on the upper side and the lower side of the return spring.

As a further improvement of the technology, a spring fixing plate is installed on the rack, one end of a return spring is fixedly installed on the spring fixing plate, and the other end of the return spring is fixedly installed on the inner end face of the sliding groove.

As a further improvement of the technology, the upper end of the telescopic rod is fixedly arranged on the sealing disc in a welding mode.

As a further improvement of the technology, a first lock hole is formed in the upper end face of the guide sleeve, an internal thread is formed in the inner circular face of the first lock hole, the guide sleeve is installed on the installation shell, and the guide sleeve is aligned with one square hole of two square holes formed in the installation shell; the rack is located the installation shell and installs the sleeve outside one end and opens there is the second lockhole, has the internal thread on the interior disc of second lockhole, and second lockhole and first lockhole mutually support.

When the leakage-proof function of the leakage-proof mechanism is not needed, the rack is pressed down, and then the rack is fixed on the mounting shell through the locking bolt, the second lock hole formed in the rack and the first lock hole formed in the guide sleeve.

As a further improvement of the technology, the lower end of the mounting rod and the mounting base are fixed through a bolt; when the position of the stay cord arranged on the inner circle surface of the gear ring and the position of the same stay cord arranged on the outer circle surface of the frame body are connected and pass through the circle center of the gear ring, the stay cord is in a loose state.

Compared with the traditional breather valve technology, the breather valve has the following beneficial effects:

1. according to the breather valve designed by the invention, only when the oil tank is tilted to a temperature greater than 20 degrees, the structure consisting of the balancing weight, the mounting rod and the mounting base can be tilted to drive the frame body and the sealing plate to swing, so that the second air holes formed in the sealing plate and the first air holes formed in the sealing cover are correspondingly staggered one by one, the channel between the mounting sleeve and the breather valve body is closed, and a leakage-proof effect is achieved; and when the inclination angle of the oil tank is less than 20 degrees, the installation base is larger than the projection area of the balancing weight and the installation rod on the installation base, so that the structure formed by the balancing weight, the installation rod and the installation base cannot topple over.

2. According to the breather valve designed by the invention, when the anti-leakage mechanism is not needed, the rack is pressed down, and then the rack is fixed on the mounting shell through the locking bolt, the second lock hole formed in the rack and the first lock hole formed in the guide sleeve; in this case, the leakage preventing mechanism corresponds to a through pipe installed between the oil tank and the breather valve body.

3. According to the invention, the reset mechanism is designed in consideration of the condition that the reset of the frame body and the mounting rod is not easy, so that the mounting rod and the frame body are ensured to be conveniently reset.

4. The invention has simple structure for resetting through the pull rope.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is an external view of the leakage preventing mechanism.

Fig. 3 is a schematic structural view of the leakage preventing mechanism.

Fig. 4 is a schematic view of the appearance of the mounting sleeve.

Fig. 5 is a schematic view of the mounting sleeve structure.

Fig. 6 is a schematic view of the reset mechanism installation.

Fig. 7 is a schematic view of the reset mechanism and the leak prevention mechanism in cooperation.

Fig. 8 is a schematic structural view of the return mechanism.

Fig. 9 is a schematic view of the structure of the leakage preventing mechanism.

Fig. 10 is a schematic view of the mounting rod and stationary housing structure.

Number designation in the figures: 1. a breather valve body; 2. an anti-leakage mechanism; 3. a reset mechanism; 4. mounting a barrel sleeve; 5. a telescopic rod; 6. a frame body; 7. a balancing weight; 8. mounting a rod; 9. a stationary case; 10. a sealing cover; 11. a first air hole; 12. a guide sleeve; 13. mounting a shell; 14. mounting a ring groove; 15. a square hole; 16. a first lock hole; 17. a first gear; 18. a ring gear; 19. pulling a rope; 20. locking the bolt; 21. a rack; 22. a second lock hole; 23. a second air hole; 24. a sealing plate; 25. a support frame; 26. a universal joint; 27. a second gear; 28. a guide plate; 29. a return spring; 30. a spring mounting plate; 31. spherical hinge; 32. installing a base; 33. and fixing the shaft.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in figure 1, the breather valve comprises a breather valve body 1, wherein the breather valve body 1 designed by the invention has the same structure and function as the existing breather valve; the pressure difference between the inside and the outside of the storage tank is kept within an allowable value range. The method is characterized in that: also included is an anti-leak mechanism 2.

As shown in fig. 2 and 3, the leakage-proof mechanism comprises a reset mechanism 3, an installation sleeve 4, a sealing plate 24 and a frame body 6, wherein the lower end of the installation sleeve is installed at an oil port of the oil tank, and a breather valve is installed at the upper end of the installation sleeve; as shown in fig. 4 and 5, a sealing cover 10 is fixedly mounted on the inner circular surface of the upper end of the mounting sleeve, the sealing cover 10 is provided with inner and outer spherical surfaces, and the inner and outer spherical surfaces of the sealing cover 10 are provided with first air holes 11 which are uniformly distributed and run through; as shown in fig. 3, the lower end of the frame body 6 is mounted in the mounting sleeve through a universal joint 26, and the upper end of the frame body 6 is fixedly provided with a sealing plate 24; the sealing plate 24 is positioned in the mounting sleeve, the sealing plate 24 is provided with an inner spherical surface and an outer spherical surface, and the outer spherical surface of the sealing plate 24 is tightly attached to the inner spherical surface of the sealing cover 10; the inner and outer spherical surfaces of the sealing plate 24 are provided with second air holes 23 which are uniformly distributed and run through, and the second air holes 23 formed on the sealing plate 24 are correspondingly matched with the first air holes 11 formed on the sealing cover 10; as shown in fig. 6, the reset mechanism 3 is installed at the lower end of the installation sleeve, and the reset mechanism 3 plays a reset role in the swinging of the frame body 6.

The universal joint 26 designed by the invention has the functions of supporting the frame body 6 and the sealing plate 24 on one hand, and ensuring that the sealing plate 24 is tightly attached to the sealing cover 10 through the universal joint 26 on the other hand, so that the second air hole 23 formed in the sealing plate 24 is matched with the first air hole 11 formed in the sealing cover 10.

The inner circle surface of the mounting sleeve is provided with a mounting ring groove 14, and two through square holes 15 are arranged at two ends of the mounting shell 13; the mounting shell 13 is fixedly mounted on the outer circular surface of the mounting sleeve, and the mounting shell 13 is communicated with the inner side of the mounting sleeve.

As shown in fig. 7, the reset mechanism 3 comprises a rack 21, a gear ring 18 and a pull rope 19, wherein the gear ring 18 is rotatably mounted in a mounting ring groove 14 formed in a mounting sleeve, and a plurality of pull ropes 19 are uniformly mounted between the inner circumferential surface of the gear ring 18 and the outer circumferential surface of the frame body 6 in the circumferential direction; the rack 21 is slidably mounted in the mounting shell 13, and the rack 21 is matched with the two square holes 15 formed in the mounting shell 13; a return spring 29 is arranged between the rack 21 and the inner end surface of the mounting shell 13, and the rack 21 controls the gear ring 18 to rotate through the transmission of the gear.

When the oil tank is turned over to be more than 20 degrees and less than 30 degrees, the support body 6 swings relative to the mounting sleeve under the effect of the turning force, the support body 6 swings to drive the sealing plate 24 mounted on the support body to swing, the second air hole 23 formed in the sealing plate 24 and the first air hole 11 formed in the sealing cover 10 are correspondingly staggered one by one, a channel between the mounting sleeve and the breather valve body 1 is closed, and the anti-leakage effect is achieved. Under the normal not state of tipping, the insert surface of closing plate 24 and the interior sphere of sealed lid 10 closely laminate, and the second gas pocket 23 that opens on the closing plate 24 and the first gas pocket 11 that opens on the sealed lid 10 correspond mutual intercommunication for installation sleeve and breather valve body 1 become the intercommunication state each other, the gas in the oil tank and breather valve body 1 switch-on, this kind of state is the same with the state that normal breather valve installed on the oil tank, has only increased one section pipeline that link up between breather valve and oil tank.

As shown in fig. 1, the leakage-proof mechanism 2 has flanges at the upper and lower ends of the mounting sleeve, the flange at the lower end is fixedly mounted at the oil port of the oil tank by bolts, and the flange at the upper end is fixedly connected with the inlet at the lower end of the breather valve body 1 by bolts. The joint of each flange is sleeved with a sealing washer to seal the channel between the oil tank, the leakage-proof mechanism and the breather valve.

As shown in fig. 10, the upper end of the fixing casing 9 is an open end, and as shown in fig. 3, the lower end of the fixing casing 9 is detachably mounted in the mounting sleeve through a support bracket 25 and is located at the lower end of the mounting sleeve; as shown in fig. 9, the lower end of the mounting rod 8 is detachably mounted with a mounting base 32, and the mounting base 32 is placed in the fixed shell 9; the upper end of the mounting rod 8 is fixedly provided with a balancing weight 7, and the balancing weight 7 is positioned on the upper side of the universal joint 26; the upper end of the telescopic rod 5 is fixedly arranged on the inner spherical surface of the sealing plate 24, the lower end of the telescopic rod 5 is connected with the upper end of the balancing weight 7 through the spherical hinge 31, the fixed shell 9 is positioned on the lower side of the universal joint 26, and the mounting rod 8 penetrates through the center of the universal joint 26.

The lower end of a fixed shell 9 is detachably arranged in a mounting sleeve through a support frame 25 and is positioned at the lower end of the mounting sleeve; the lower end of the installation rod 8 is detachably provided with an installation base 32, and the lower end of the installation rod 8 is installed in the fixed shell 9 through the installation base 32; the reason for the detachable installation is that the installation base 32 and the fixed shell 9 with different sizes are selected and replaced according to the state of the road surface on which the tank truck frequently runs or the actual state of the storage area of the tank truck, so that the requirements of the tank on different tipping angles are met.

As shown in fig. 7, both ends of the fixed shaft 33 are rotatably mounted on both upper and lower end surfaces in the mounting case 13; the first gear 17 is fixedly mounted on the fixed shaft 33, the rack 21 is engaged with the first gear 17, and the first gear 17 is engaged with the ring gear 18.

As shown in fig. 8, both ends of the fixed shaft 33 are rotatably mounted on both upper and lower end surfaces in the mounting case 13; the first gear 17 and the second gear 27 are respectively and fixedly arranged at two ends of the fixed shaft 33, the diameter of the first gear 17 is 3 times of that of the second gear 27, the rack 21 is meshed with the second gear 27, and the first gear 17 is meshed with the gear ring 18. The reason why the diameter of the first gear 17 is 3 times of the diameter of the second gear 27 is to reduce the sliding length of the rack 21, and after the rack 21 slides for a short period, the gear ring 18 can drive the rack body 6 to reset, thereby reducing the installation space of the rack 21.

As shown in fig. 8, two guide plates 28 are symmetrically and fixedly installed in the mounting case 13, and the two guide plates 28 are respectively located at upper and lower sides of the return spring 29.

As shown in fig. 8, a spring fixing plate is mounted on the rack 21, one end of a return spring 29 is fixedly mounted on the spring fixing plate, and the other end of the return spring 29 is fixedly mounted on the inner end surface of the sliding groove.

The upper end of the telescopic rod 5 is fixedly arranged on the sealing disc in a welding mode. Because the center of the universal joint 26 and the hinge point of the spherical hinge 31 are not in the same position, the center of the mounting rod 8 driving the sealing plate 24 to swing and the center of the frame body 6 driving the sealing plate 24 to swing are not in the same position, and in order to prevent interference, the spherical hinge 31 and the sealing plate 24 are connected through the telescopic rod 5, and the interference is prevented through the expansion and contraction of the telescopic rod 5.

As shown in fig. 5, a first locking hole 16 is formed on the upper end surface of the guide sleeve 12, an internal thread is formed on the inner circumferential surface of the first locking hole 16, the guide sleeve 12 is mounted on the mounting shell 13, and the guide sleeve 12 is aligned with one of two square holes 15 formed on the mounting shell 13; as shown in fig. 8, one end of the rack 21 located outside the mounting case 13 and the mounting sleeve is provided with a second locking hole 22, and the inner circumferential surface of the second locking hole 22 is provided with an internal thread, as shown in fig. 6, and the second locking hole 22 and the first locking hole 16 are engaged with each other.

When the leakage preventing function of the leakage preventing mechanism 2 is not required, the rack 21 is pressed down, and then the rack 21 is fixed to the mounting case 13 through the locking bolt 20, the second locking hole 22 formed in the rack 21, and the first locking hole 16 formed in the guide sleeve 12.

The lower end of the mounting rod 8 is fixed with the mounting base 32 through bolts; when the position of the pulling rope 19 arranged on the inner circle surface of the gear ring 18 and the position of the same pulling rope 19 arranged on the outer circle surface of the frame body 6 are connected to pass through the circle center of the gear ring 18, the pulling rope 19 is in a loose state.

The specific working process is as follows: when the breather valve designed by the invention is applied, when the oil tank is tipped over, the gravity center of the balancing weight 7 shifts, when the tipping angle of the oil tank is less than 20 degrees, the gravity center of the balancing weight 7 does not shift enough to enable the balancing weight 7 to drive the installation base 32 to turn over relative to the fixed shell 9 through the installation rod 8 under the action of the self weight, and the bottom surface of the installation base 32 is always kept in a contact state with the bottom surface in the fixed shell 9; the tipping angle is not enough to ensure that the breather valve cannot bear the oil pressure in the oil tank to cause leakage or the oil poured into the oil tank by the oil tank cannot flood the breather valve; when the oil tank is tilted to a position larger than 20 degrees, the gravity center offset angle of the balancing weight 7 is enough to enable the balancing weight 7 to drive the installation base 32 to turn laterally relative to the fixed shell 9 through the installation rod 8 under the action of the self weight of the balancing weight 7 by taking the outer circular surface on one side of the installation base 32 as a fulcrum, the bottom surface of the installation base 32 is separated from the bottom surface in the fixed shell 9, at the moment, the balancing weight 7 swings to drive the telescopic rod 5 to swing through the spherical hinge 31, the telescopic rod 5 swings to drive the sealing plate 24 to swing relative to the installation sleeve, and the sealing plate. The frame body 6 and the sealing plate 24 of the invention also have the tendency of toppling in the toppling process of the oil tank, but whether the toppling is mainly influenced by the counterweight 7 and the mounting rod 8, so the weight of the counterweight 7 is heavier than that of the related structure.

When the anti-leakage mechanism is triggered, the mounting rod 8 and the frame body 6 are tilted and then reset, firstly the rack 21 is manually pressed, so that the rack 21 slides towards the inner side of the mounting shell 13, the sliding of the rack 21 drives the second gear 27 to rotate, the second gear 27 drives the first gear 17 to rotate through the fixed shaft 33, the first gear 17 drives the gear ring 18 to rotate, the gear ring 18 rotates to pull the pull rope 19 between the gear ring 18 and the frame body 6, so that the pull rope 19 is wound on the frame body 6, in tensile winding process, stay cord 19 will drive support body 6 swing gradually and make collective vertical just, reset to initial state, the in-process that support body 6 resets can drive balancing weight 7, installation base 32, installation pole 8 and closing plate 24 reset, finally make the bottom surface in installation base 32 and the bottom surface in the set casing 9 in close contact with, the vertical distribution of balancing weight 7, second gas pocket 23 that opens on the closing plate 24 and the sealed 11 one-to-one alignments of first gas pocket that open on the lid 10.

When the rack 21 is released, the rack 21 slides towards the outside of the mounting shell 13 under the action of the return spring 29, and the ring gear 18 drives the pull rope 19 to release through the transmission of the second gear 27 and the first gear 17.