High efficiency breather valve for venting positive and negative pressure

Abstract

The utility model relates to the technical field of breathing valve, especially the high -efficient breathing valve for discharging positive and negative pressure, including main valve body, threaded rod and movable disc, the top of main valve body is opened with exhaust port, the right side rotation connection of main valve body top has two threaded rods, the top of exhaust port is provided with positive pressure valve disc, the top fixedly connected with connecting rod of positive pressure valve disc, the whole body of connecting rod is equipped with spring piece, the top slidingly connected with movable disc of connecting rod, the top of spring piece and the bottom of movable disc are pasted, the bottom of spring piece and the top of positive pressure valve disc are pasted, spring piece is used for promoting positive pressure valve disc and exhaust port close adhesion, the top of movable disc is provided with protective head; the utility model discloses through rotating annular handle drive threaded rod rotation, then by threaded rod continues to drive movable disc and goes down along the slide pole compression spring piece, utilizes spring reaction force and promotes positive pressure valve disc to go down to the airtight exhaust port, to realize spring pressure regulating function.

Description

Technical Field

[0001] This utility model relates to the field of breathing valve technology, and in particular to a high-efficiency breathing valve for releasing positive and negative pressure. Background Technology

[0002] As is well known, an explosion-proof breather valve is a type of valve that ensures the storage tank space is isolated from the atmosphere within a certain pressure range, while also allowing communication with the atmosphere when the pressure exceeds or falls below this range. Its function is to prevent damage to the storage tank due to overpressure or vacuum, and at the same time reduce the evaporation loss of the stored liquid. When the pressure inside the tank reaches the rated positive pressure for exhalation, the pressure valve opens, and the steam inside the tank is discharged. When the vacuum inside the tank reaches the rated negative pressure for inhalation, the vacuum valve opens, and air enters.

[0003] Common high-efficiency breather valves used for releasing positive and negative pressure only include the functions of exhaust and intake. They can maintain the pressure balance of the tank area by exhaling and inhaling gas through the breather valve. However, they lack the function of adjusting the spring preload and cannot guarantee the sealing performance of the valve body. The sealing performance of the valve body is prone to decay over the service time. When the spring component undergoes multiple cyclic loads, it will produce cumulative plastic deformation. Its effective elastic force cannot overcome the movement resistance of the connecting rod to accurately press the positive pressure valve disc onto the exhaust port sealing surface, resulting in an increase in the gas leakage rate at the exhaust port. This directly causes the pressure fluctuation range inside the tank to exceed the process control threshold.

[0004] Therefore, to address the problem that the lack of adjustable spring preload leads to elastic decay of the spring after long-term compression cycles, resulting in insufficient residual elasticity to drive the connecting rod to fully press the positive pressure valve disc against the exhaust port sealing surface, causing continuous gas leakage and causing the tank pressure to deviate from the allowable range of the process, a high-efficiency breather valve for releasing positive and negative pressure can be designed. Utility Model Content

[0005] To overcome the problem that the lack of adjustable spring preload leads to spring elasticity decay after long-term compression cycles, and its residual elasticity is insufficient to drive the connecting rod to fully press the positive pressure valve disc against the exhaust port sealing surface, resulting in continuous gas leakage and causing the tank pressure to deviate from the process allowable range.

[0006] The technical solution of this utility model is as follows: a high-efficiency breathing valve for releasing positive and negative pressure, comprising a main valve body, a threaded rod, and a movable disc. The top of the main valve body is provided with an exhaust port. Two threaded rods are rotatably connected to the right side of the top of the main valve body. A positive pressure valve disc is provided at the top of the exhaust port. A connecting rod is fixedly connected to the top of the positive pressure valve disc. A spring is fitted around the connecting rod. The top of the connecting rod is slidably connected to the movable disc. The top of the spring is in contact with the bottom of the movable disc, and the bottom of the spring is in contact with the top of the positive pressure valve disc. The spring is used to push the positive pressure valve disc to fit tightly with the exhaust port. A protective end cap is provided above the movable disc. The threaded rod passes through the movable disc and the protective end cap and is connected to an annular handle.

[0007] Preferably, the screw rod is rotated by rotating the ring handle. The rotating screw rod drives the movable disc to move downward. At the same time, the movable disc slides downward along the slide rod. During this process, the movable disc applies pressure to the spring, thereby compressing the spring. The characteristics of the spring push the positive pressure valve disc downward until the positive pressure valve disc is tightly fitted with the exhaust port, thus realizing the function of adjusting the spring pressure.

[0008] Preferably, a slide rod is fixedly connected to the left side of the top of the main valve body, and the top of the slide rod passes through the movable disc and the protective end cap to connect to a limit block.

[0009] Preferably, a flange is fixedly connected to the bottom of the main valve body, and a support ring is fixedly connected to the upper end of the outer side of the main valve body.

[0010] Preferably, the protective end cap has a ring-shaped array of supporting arc plates inside, and a protective frame is fixedly connected to the bottom of the supporting arc plates.

[0011] Preferably, a protective net is provided on the inner side of the protective frame, and the bottom end of the protective frame is fixedly connected to the top of the support ring.

[0012] Preferably, an air intake pipe is fixedly connected to the right side of the main valve body, and an air intake frame is fixedly connected to the end of the air intake pipe away from the main valve body.

[0013] Preferably, a sealing cover is fixedly connected to the top of the air intake frame, a telescopic rod is provided at the bottom of the sealing cover, and a negative pressure valve disc is fixedly connected to the bottom end of the telescopic rod.

[0014] The beneficial effects of this utility model are:

[0015] The adjustment mechanism achieves linear compensation of spring preload through threaded transmission, effectively compensating for the elastic force attenuation caused by spring plastic deformation, ensuring that the valve disc and the exhaust port sealing interface maintain uniform contact stress, thereby accurately maintaining the set operating pressure threshold and significantly improving the sealing reliability and pressure balance stability of the breather valve throughout its entire life cycle. Attached Figure Description

[0016] Figure 1 The diagram shown is a schematic representation of the overall structure of this utility model.

[0017] Figure 2 The diagram shown is a schematic cross-sectional view of the overall structure of this utility model.

[0018] Figure 3 The diagram shown is a schematic representation of the main valve body structure of this utility model.

[0019] Figure 4 The diagram shown is a schematic representation of the explosion structure of the protective component of this utility model.

[0020] Figure 5 The diagram shown is a schematic representation of the exhaust assembly structure of this utility model.

[0021] Explanation of reference numerals in the attached diagram: 1. Main valve body; 2. Exhaust port; 3. Slide rod; 4. Threaded rod; 5. Movable disc; 6. Connecting rod; 7. Positive pressure valve disc; 8. Spring component; 9. Protective end cap; 10. Limiting block; 11. Annular handle; 12. Flange; 13. Support ring; 14. Support arc plate; 15. Protective frame; 16. Protective net; 17. Inlet pipe; 18. Inlet circular frame; 19. Sealing cover; 20. Telescopic rod; 21. Negative pressure valve disc. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please see Figures 1-5 This utility model provides an embodiment: a high-efficiency breathing valve for releasing positive and negative pressure, including a main valve body 1, threaded rods 4, and a movable disc 5. The top of the main valve body 1 has an exhaust port 2. Two threaded rods 4 are rotatably connected to the right side of the top of the main valve body 1. A positive pressure valve disc 7 is provided at the top of the exhaust port 2. A connecting rod 6 is fixedly connected to the top of the positive pressure valve disc 7. A spring 8 is fitted around the connecting rod 6. The top of the connecting rod 6 is slidably connected to the movable disc 5. The top of the spring 8 is in contact with the bottom of the movable disc 5, and the bottom of the spring 8 is in contact with the top of the positive pressure valve disc 7. The spring 8 is used to push the positive pressure valve disc 7 to fit tightly against the exhaust port 2. A [missing information - likely a design feature] is provided above the movable disc 5. A protective end cap 9 is provided, and a threaded rod 4 passes through the movable disc 5 and the protective end cap 9 and is connected to an annular handle 11. By rotating the annular handle 11, torque is applied to drive the threaded rod 4 to generate a helical motion. This rotational kinetic energy is converted into a precise axial displacement of the movable disc 5 through the transmission ratio of the threaded pair. During the displacement process, the movable disc 5 applies progressive compression loading to the spring 8. Based on the nonlinear stress and strain characteristics of the elastic body, the mechanical energy is converted into a directional force, driving the positive pressure valve disc 7 to move towards the sealing end face of the exhaust port 2 at a constant rate. Finally, a full circumferential contact stress field is established between the sealing cone surface of the positive pressure valve disc 7 and the pressure-bearing end face of the exhaust port 2, forming a precisely adjustable sealing preload compensation structure.

[0024] Please see Figures 2-5In this embodiment, a sliding rod 3 is fixedly connected to the left side of the top of the main valve body 1. The top of the sliding rod 3 passes through the movable disc 5 and the protective end cap 9 and is connected to a limit block 10. When the threaded rod 4 drives the movable disc 5 to move downward, the movable disc 5 slides downward along the sliding rod 3. A flange 12 is fixedly connected to the bottom of the main valve body 1. A support ring 13 is fixedly connected to the upper end of the outer side of the main valve body 1. The flange 12 is fixedly connected to the top of the tank. The protective end cap 9 has a support arc plate 14 arranged in a ring array inside. A protective frame 15 is fixedly connected to the bottom end of the support arc plate 14. The protective end cap 9 blocks rainwater from the outside.

[0025] Please see Figures 1-5 In this embodiment, a protective net 16 is provided on the inner side of the protective frame 15. The bottom end of the protective frame 15 is fixedly connected to the top of the support ring 13. Exhaust is carried out through the protective net 16, and external debris is blocked by the protective net 16. An air inlet pipe 17 is fixedly connected to the right side of the main valve body 1. An air inlet round frame 18 is fixedly connected to the end of the air inlet pipe 17 away from the main valve body 1. After the external gas enters the air inlet round frame 18, it enters the interior of the main valve body 1 through the air inlet pipe 17, and then passes through the main valve. When gas 1 enters the tank, the pressure inside the tank stops decreasing, allowing the air pressure inside and outside the tank to balance. A sealing cover 19 is fixedly connected to the top of the air inlet frame 18, and a telescopic rod 20 is provided at the bottom of the sealing cover 19. A negative pressure valve disc 21 is fixedly connected to the bottom end of the telescopic rod 20. When gas is drawn out of the tank, the pressure in the upper gas space inside the tank decreases. When the operating negative pressure of the breathing valve is reached, the atmosphere outside the tank pushes the negative pressure valve disc 21 upward, allowing outside gas to enter the interior of the air inlet frame 18.

[0026] During operation, the pressure inside the tank rises. When it reaches the positive operating pressure of the breather valve, the gas inside the tank pushes the positive pressure valve disc 7 upwards. At this time, the gas inside the tank is discharged to the outside through the exhaust port 2. When the valve body is depressurized, the protective end cap 9 blocks rainwater from the outside, while the protective net 16 blocks debris from the outside, preventing rainwater and debris from entering the valve body. When gas is drawn out of the tank, the pressure in the upper gas space inside the tank drops. When it reaches the negative operating pressure of the breather valve, the atmosphere outside the tank pushes the negative pressure valve disc 21 upwards, allowing outside gas to enter the interior of the air inlet frame 18. After entering the air inlet frame 18, the outside gas passes through... The intake pipe 17 enters the interior of the main valve body 1, and then enters the tank through the main valve body 1, so that the pressure inside the tank no longer continues to drop, and the air pressure inside the tank is balanced with that outside the tank. When the elastic force of the spring element 8 decays, the screw rod 4 is driven by rotating the ring handle 11 to generate a helical motion. This rotational displacement is converted into the axial translation of the movable disc 5 along the slide rod 3 through the threaded pair. During the downward movement of the movable disc 5, an axial compressive load is applied to the spring element 8, forcing the spring element 8 to store elastic potential energy and transmit linear driving force to the positive pressure valve disc 7, until the sealing surface of the positive pressure valve disc 7 and the exhaust port 2 form a full-area contact stress field, thus completing the continuously adjustable function of the spring preload.

[0027] Through the above steps, rotating the annular handle 11 drives the threaded rod 4 to generate synchronous rotational motion. This rotational energy is converted into the vertical displacement of the movable disc 5 through threaded transmission. Under the guidance and constraint of the slide rod 3, the movable disc 5 moves stably downward along the axial direction. During its motion trajectory, it continuously applies an axial compressive load to the spring 8. Based on the elastic energy storage characteristics of the spring 8, the accumulated elastic potential energy is converted into a continuous force pushing the positive pressure valve disc 7, forcing the positive pressure valve disc 7 to gradually approach the exhaust port 2 along the axial direction, ultimately forming a complete contact state between the valve disc sealing surface and the end face of the exhaust port 2. This achieves a linear adjustment mechanism for the spring preload, thus solving the problem of common high-efficiency breathing valves used for releasing positive and negative pressure, which only include exhaust and intake functions, allowing exhalation and... The system draws in gas to maintain pressure balance in the tank area, but lacks the function of adjusting the spring preload. During long-term operation, the valve body sealing interface is prone to gradual deterioration of sealing performance. As the internal lattice structure of the spring element 8 gradually accumulates irreversible residual deformation under periodic reciprocating load, the combined value of its dynamic elastic restoring force and static preload is lower than the minimum starting force threshold required to drive the connecting rod 6 to move axially. This causes the positive pressure valve disc 7 to be unable to obtain sufficient contact pressure to maintain geometric conformal fit with the sealing cone surface of the exhaust port 2, thereby causing a continuous increase in the microscopic leakage flux at the exhaust channel interface. Ultimately, this leads to an abnormal operating condition where the pressure amplitude inside the sealed tank oscillates more intensely and exceeds the allowable fluctuation range of the preset process parameters.

Claims

1. A high-efficiency breather valve for releasing positive and negative pressure, comprising a main valve body (1); characterized in that: It also includes a threaded rod (4) and a movable disc (5). The top of the main valve body (1) is provided with an exhaust port (2). Two threaded rods (4) are rotatably connected to the right side of the top of the main valve body (1). A positive pressure valve disc (7) is provided at the top of the exhaust port (2). A connecting rod (6) is fixedly connected to the top of the positive pressure valve disc (7). A spring (8) is fitted around the connecting rod (6). The top of the connecting rod (6) is slidably connected to the movable disc (5). The top of the spring (8) is in contact with the bottom of the movable disc (5). The bottom of the spring (8) is in contact with the top of the positive pressure valve disc (7). The spring (8) is used to push the positive pressure valve disc (7) to fit tightly with the exhaust port (2). A protective end cap (9) is provided above the movable disc (5). The threaded rod (4) passes through the movable disc (5) and the protective end cap (9) and is connected to a ring handle (11).

2. The high-efficiency breather valve for releasing positive and negative pressure according to claim 1, characterized in that: A slide rod (3) is fixedly connected to the left side of the top of the main valve body (1). The top of the slide rod (3) passes through the movable disc (5) and the protective end cap (9) and is connected to the limit block (10).

3. The high-efficiency breather valve for releasing positive and negative pressure according to claim 1, characterized in that: A flange (12) is fixedly connected to the bottom of the main valve body (1), and a support ring (13) is fixedly connected to the upper end of the outer side of the main valve body (1).

4. The high-efficiency breather valve for releasing positive and negative pressure according to claim 3, characterized in that: The protective end cap (9) has a ring array of supporting arc plates (14) inside, and a protective frame (15) is fixedly connected to the bottom of the supporting arc plates (14).

5. The high-efficiency breather valve for releasing positive and negative pressure according to claim 4, characterized in that: A protective net (16) is provided on the inner side of the protective frame (15), and the bottom end of the protective frame (15) is fixedly connected to the top of the support ring (13).

6. The high-efficiency breather valve for releasing positive and negative pressure according to claim 1, characterized in that: An air inlet pipe (17) is fixedly connected to the right side of the main valve body (1), and an air inlet frame (18) is fixedly connected to the end of the air inlet pipe (17) away from the main valve body (1).

7. The high-efficiency breather valve for releasing positive and negative pressure according to claim 6, characterized in that: A sealing cover (19) is fixedly connected to the top of the air intake frame (18), and a telescopic rod (20) is provided at the bottom of the sealing cover (19). A negative pressure valve disc (21) is fixedly connected to the bottom end of the telescopic rod (20).

Images