Liquid seal type breather valve applied to oil storage tank

Abstract

The utility model relates to the technical field of breathing valve, concretely relates to a liquid seal type breathing valve for oil storage tank, it includes: outer tube, inner tube is coaxially fixed and is set in the outer tube, the lateral wall of inner tube outside still respectively penetrates and is opened with the first through -hole of being close to the bottom of inner tube and the second through -hole of top, the outer tube still circumferentially is equipped with a plurality of partition plates and alternately constitutes the exhaust passage of first through -hole communication and the air inlet passage of second through -hole communication between a plurality of partition plates, positive pressure valve unit is coaxially arranged in the inner tube, the positive pressure valve unit is equipped with the exhalation valve core that can along the axis of the outer tube longitudinal slip, negative pressure valve unit is coaxially arranged in the top of inner tube, the positive pressure valve unit is equipped with the inhalation valve core that can along the axis of the outer tube longitudinal slip, the present application not only can effectively solve the oil gas leakage problem, but also can respond quickly under the condition of positive pressure and negative pressure.

Description

Technical Field

[0001] This utility model relates to the field of breather valve technology, specifically to a liquid-sealed breather valve applied to oil storage tanks. Background Technology

[0002] Oil storage tanks are widely used in the petroleum and chemical industries. The large quantities of oil stored inside can cause frequent pressure fluctuations due to temperature changes and oil inlet / outlet operations. To ensure the safe operation of oil storage tanks, breather valves are usually installed on the tank body to discharge oil vapors under positive pressure and replenish air under negative pressure, thereby maintaining the pressure balance inside and outside the tank.

[0003] However, existing breather valves mostly employ mechanical seals or simple valve core structures, which have the following shortcomings: 1. Unstable sealing effect: Traditional breather valves rely on rigid contact for sealing in a static state. The sealing performance is easily affected by valve core wear, machining accuracy, or impurities, leading to valve leakage and increasing oil and gas losses and environmental pollution risks. 2. Insufficient application of liquid seal structures: Although some liquid-sealed breather valves can achieve sealing through liquid, the liquid is easily evaporated, frozen, or diluted by temperature changes, leading to seal failure. Furthermore, liquid level changes are difficult to monitor in a timely manner. 3. Poor reliability of positive and negative pressure response: When positive or negative pressure occurs inside the tank, the valve core of existing breather valves is not sensitive enough, easily exhibiting a delayed response, affecting tank safety. 4. Inconvenient maintenance: Traditional structures involve complex operations when removing, replacing, or replenishing the sealing fluid from the valve core, increasing the difficulty of use and maintenance and hindering rapid on-site emergency response. Utility Model Content

[0004] To address the aforementioned problems, a liquid-sealed breather valve for use in oil storage tanks is provided. This valve not only effectively solves the problem of oil and gas leakage but also responds quickly under both positive and negative pressure conditions, and is easy to maintain and replenish. This solves the technical problems of existing breather valves, such as unstable sealing performance, insufficient application of liquid-sealed structures, and poor reliability of positive and negative pressure response.

[0005] To address the problems of existing technologies, this utility model provides a liquid-sealed breather valve for oil storage tanks, comprising: an outer cylinder; an inner cylinder coaxially fixed inside the outer cylinder, wherein the inner cylinder has a first through hole near the bottom and a second through hole at the top of the inner cylinder, respectively; the inner cylinder also has multiple partition plates circumferentially arranged outside the inner cylinder, and the partition plates alternately form an exhaust channel communicating with the first through hole and an air intake channel communicating with the second through hole; a positive pressure valve unit coaxially arranged inside the inner cylinder; the positive pressure valve unit has an exhalation valve core that can slide longitudinally along the axis of the outer cylinder; when the pressure inside the oil storage tank is higher than the external atmospheric pressure, the exhalation valve core will be longitudinally lifted and connected to the exhaust channel to discharge gas; a negative pressure valve unit coaxially arranged at the top of the inner cylinder; the positive pressure valve unit has an intake valve core that can slide longitudinally along the axis of the outer cylinder; when the pressure inside the oil storage tank is lower than the external atmospheric pressure, the intake valve core will be longitudinally lifted and connected to the intake channel to draw in air.

[0006] Preferably, the upper and lower ends of the inner cylinder are respectively fixedly provided with a first partition plate that can intermittently block the lower end of the exhaust channel and a second partition plate that can staggerly block the upper end of the intake channel.

[0007] Preferably, the positive pressure valve unit is further provided with a guide chamber that can guide the air source into the inner cylinder and a guide column that can guide the breathing valve to slide axially; the guide chamber is coaxially fixedly disposed at the bottom of the inner cylinder and passes through the inner cylinder, and is used to guide the air source into the inner cylinder; the guide column is fixedly disposed at the bottom of the inner cylinder and coaxially disposed outside the guide chamber and forms a second annular cavity with the guide chamber.

[0008] Preferably, the positive pressure valve unit is further provided with a sealing fluid that can seal the breathing valve core in real time; the sealing fluid is disposed in the second annular cavity.

[0009] Preferably, the positive pressure valve unit is further provided with a detection tube that can detect the liquid level of the sealing fluid in real time.

[0010] Preferably, the exhalation valve core consists of an outer guide cover and an inner guide cover coaxially fixed inside the outer guide cover.

[0011] The advantages of this utility model compared to the prior art are:

[0012] 1. This utility model achieves liquid sealing of the breather valve in the non-working state by filling the second annular cavity with sealing liquid, effectively avoiding the problem of oil and gas leakage in the static state, and reducing energy consumption and environmental pollution.

[0013] 2. This utility model, through the first and second partitions set at the bottom and top of the inner cylinder, can physically isolate and directionally guide the air intake and exhaust channels, ensuring that the airflow moves along a predetermined path under different pressure conditions, thereby achieving rapid exhaust under positive pressure and timely air replenishment under negative pressure.

[0014] 3. This utility model, through the coordinated cooperation of the guide column, inner guide cover and outer guide cover, ensures that the exhalation valve core maintains a stable axial movement trajectory during the exhalation process, avoiding jamming and wear caused by deviation or shaking, and improving the valve core's sensitivity and service life.

[0015] 4. This utility model, through the detection tube connected to the second annular cavity, can monitor the liquid level of the sealing fluid in real time, making it easy for operators to quickly determine on-site whether liquid replenishment or maintenance is needed. Attached Figure Description

[0016] Figure 1 This is a three-dimensional diagram of a liquid-sealed breather valve used in oil storage tanks.

[0017] Figure 2 This is a side view of a liquid-sealed breather valve used in oil storage tanks.

[0018] Figure 3 yes Figure 2 Sectional view at point AA.

[0019] Figure 4 yes Figure 3 A magnified view of section B.

[0020] Figure 5 yes Figure 3 A magnified view of a portion of point C.

[0021] Figure 6 This is a top view of a liquid-sealed breather valve used in oil storage tanks.

[0022] Figure 7 yes Figure 6 A three-dimensional sectional view of the section at DD.

[0023] Figure 8 This is an exploded perspective view of a liquid-sealed breather valve used in oil storage tanks.

[0024] The numbers on the map are:

[0025] 1. Outer cylinder; 11. Conical connecting cylinder;

[0026] 2. Inner cylinder; 21. First through hole; 22. Second through hole; 23. Exhaust passage; 24. Intake passage; 25. First partition; 26. Second partition; 27. Divider plate;

[0027] 3. Positive pressure valve unit; 31. Exhalation valve core; 311. Outer guide cover; 312. Inner guide cover; 32. Guide chamber; 33. Guide column; 34. Sealing fluid; 35. Detection tube;

[0028] 4. Negative pressure valve unit; 41. Suction valve core. Detailed Implementation

[0029] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0030] See Figures 1 to 8 As shown: A liquid-sealed breather valve for an oil storage tank includes: an outer cylinder 1; an inner cylinder 2, coaxially fixed inside the outer cylinder 1, wherein the inner cylinder 2 has a first through hole 21 near the bottom and a second through hole 22 at the top of the inner cylinder 2, respectively; the inner cylinder 2 also has a plurality of partition plates 27 circumferentially arranged on its outer side, and the partition plates 27 alternately form an exhaust channel 23 communicating with the first through hole 21 and an intake channel 24 communicating with the second through hole 22; and a positive pressure valve unit 3, coaxially arranged inside the inner cylinder 2; The positive pressure valve unit 3 is equipped with an exhalation valve core 31 that can slide longitudinally along the axis of the outer cylinder 1; when the pressure inside the oil tank is higher than the external atmospheric pressure, the exhalation valve core 31 will be lifted longitudinally and connected to the exhaust channel 23 to discharge gas; the negative pressure valve unit 4 is coaxially arranged at the top of the inner cylinder 2; the positive pressure valve unit 3 is equipped with an intake valve core 41 that can slide longitudinally along the axis of the outer cylinder 1; when the pressure inside the oil tank is lower than the external atmospheric pressure, the intake valve core 41 will be lifted longitudinally and connected to the intake channel 24 to draw in air.

[0031] The outer cylinder 1 is a hollow cylindrical body with openings at both ends. A conical connecting cylinder 11 is coaxially connected to the lower opening to form an air inlet. The top of the outer cylinder 1 has an annular air outlet for discharging gas from the oil storage tank. The inner cylinder 2 is also a hollow cylindrical body with an air outlet only at the top. The diameter of the inner cylinder 2 is smaller than the inner diameter of the outer cylinder 1, and it is coaxially positioned inside the outer cylinder 1, thus forming a first annular cavity between them. This first annular cavity is alternately divided by several partitions, forming an exhaust channel 23 that communicates with the first through hole 21 and an intake channel 24 that communicates with the second through hole 22, thus forming independent intake and exhaust channels 23.

[0032] When the pressure inside the oil tank is higher than the external atmospheric pressure, the air source applies a force to the exhalation valve core 31, causing it to move longitudinally upward along the inner cavity of the inner cylinder 2 until the top height of the exhalation valve core 31 exceeds the position of the first through hole 21. Then, the gas inside the tank enters the exhaust channel 23 through the first through hole 21 and flows sequentially to the air outlet at the top of the outer cylinder 1, and is finally discharged, thus realizing the automatic exhaust function under positive pressure.

[0033] When the pressure inside the oil storage tank is lower than the external atmospheric pressure, outside air enters through the air inlet of the outer cylinder 1, flows into the first through hole 21 through the exhaust channel 23, and pushes the intake valve core 41 upward after entering the inner cylinder 2. Then, it enters the intake channel 24 through the second through hole 22 and is conducted to the air inlet of the outer cylinder 1 to introduce air into the oil storage tank, thereby realizing the automatic air replenishment function under negative pressure.

[0034] By coaxially arranging the inner cylinder 2 and the outer cylinder 1 and using the multi-channel separation structure of the first annular cavity, the physical separation of the air intake and exhaust paths is achieved, avoiding mutual interference between positive and negative pressure channels. At the same time, by utilizing the automatic response actions of the exhalation valve core 31 and the inhalation valve core 41, the system can quickly and accurately complete the automatic exhaust or replenishment functions under different pressure conditions.

[0035] See Figure 8 As shown: The inner cylinder 2 is also fixedly provided with a first baffle 25 that can block the lower end of the exhaust channel 23 at intervals and a second baffle 26 that can block the upper end of the intake channel 24 in an alternating manner.

[0036] A first baffle 25 is provided at the bottom of the inner cylinder 2 to intermittently block the lower end of the exhaust passage 23. This structure can effectively prevent outside air from directly entering the exhaust passage 23 when it enters through the air inlet at the bottom of the outer cylinder 1, thereby preventing gas from being discharged without valve control and ensuring that the exhaust passage is only opened under positive pressure.

[0037] Meanwhile, a second baffle 26 is provided at the top of the inner cylinder 2 to partially block the upper end of the air intake channel 24. When the oil storage tank is under negative pressure, the suction valve core 41 is opened by the external air source, and the airflow enters the air intake channel 24 through the second through hole 22. Under the guidance of the second baffle 26, it flows along a predetermined path to the air inlet of the outer cylinder 1, thereby achieving the purpose of controlled air entering the oil storage tank.

[0038] By setting a first baffle 25 and a second baffle 26 at the bottom and top of the inner cylinder 2 respectively, effective physical isolation and directional guidance of the intake and exhaust passages are formed. This structure not only avoids energy loss caused by external air sources directly entering the exhaust passage 23 when not in operation, but also ensures the stability and control of the intake airflow direction under negative pressure.

[0039] See Figure 4As shown: The positive pressure valve unit 3 is further provided with a guide chamber 32 that can guide the air source into the inner cylinder 2 and a guide column 33 that can guide the breathing valve to slide axially; the guide chamber 32 is coaxially fixedly disposed at the bottom of the inner cylinder 2 and passes through the inner cylinder 2, and is used to guide the air source into the inner cylinder 2; the guide column 33 is fixedly disposed at the bottom of the inner cylinder 2 and coaxially disposed outside the guide chamber 32, and forms a second annular cavity with the guide chamber 32.

[0040] The guide chamber 32 is coaxially disposed at the bottom of the inner cylinder 2 to connect the outer cylinder 1 and the inner cylinder 2. Its internal structure forms a gas guiding channel, which can stably guide the gas source in the tank into the inner cylinder 2 through the guide chamber 32 when the oil storage tank is in the venting state, thereby ensuring that the airflow direction is clear and the flow path is smooth.

[0041] The guide post 33 is vertically arranged in the middle of the inner cylinder 2 and is used to longitudinally limit and guide the exhalation valve core 31 during the exhaust process, so that it can always move smoothly along the axial direction when subjected to the pressure of the air source, and avoid valve core movement delay, jamming or sealing failure caused by lateral offset or shaking.

[0042] See Figure 4 As shown: The positive pressure valve unit 3 is also provided with a sealing fluid 34 that can seal the breathing valve core in real time; the sealing fluid 34 is disposed in the second annular cavity.

[0043] By filling the second annular cavity with sealing fluid 34, when the breather valve is not in operation, the sealing fluid 34 can cover and seal the valve port of the breather valve core, thereby achieving real-time sealing of the breather valve core without the need for additional mechanical seals. This liquid seal structure can automatically adjust the sealing state according to the pressure difference between the inside and outside of the oil storage tank. When the pressure difference is insufficient to open the valve core, the sealing fluid 34 always remains in a covering state, preventing gas from escaping and effectively ensuring a tight seal under static conditions.

[0044] See Figure 2 As shown: The positive pressure valve unit 3 is also equipped with a detection tube 35 that can detect the liquid level of the sealing liquid 34 in real time.

[0045] The detection tube 35 is arranged in an L-shape. Its horizontal section is fixedly connected to the guide post 33 and communicates with the second annular cavity to transmit the liquid level information of the sealing fluid 34 to the inside of the detection tube 35. The vertical section of the detection tube 35 is located outside the outer cylinder 1 and extends vertically perpendicular to the ground, facilitating direct observation by the user. By observing the changes in the liquid level of the sealing fluid 34 in the vertical section of the detection tube 35, the actual height and quantity of the sealing fluid 34 in the second annular cavity can be reflected in real time, thus enabling intuitive monitoring and judgment of the state of the sealing fluid 34 without disassembling the structure.

[0046] By installing an L-shaped detection tube 35 connected to the second annular cavity outside the outer cylinder 1, real-time monitoring of the sealing fluid 34 level is achieved, greatly improving the operator's visual visibility of the sealing status on-site. This design avoids breather valve failure caused by insufficient or excessive sealing fluid 34, facilitating timely replenishment and maintenance.

[0047] See Figure 8 As shown: The call valve core consists of an outer guide cover 311 and an inner guide cover 312 coaxially fixed inside the outer guide cover 311.

[0048] The outer guide cover 311 is a hollow cylindrical shell with an opening at the bottom, which is installed with a clearance fit to the inner wall of the inner cylinder 2, thereby ensuring the flexibility of movement while providing necessary guiding and limiting functions. The inner guide cover 312 is located inside the exhalation valve core 31 and fits into the inner wall of the guide post 33, so that it maintains a stable center position during axial movement and avoids displacement and shaking.

[0049] When the pressure inside the oil storage tank is higher than the external atmospheric pressure, the gas source inside the tank first acts on the inner cavity space of the inner guide cover 312, and under the push of the airflow pressure, drives the inner guide cover 312 to move upward along the guide column 33; at the same time, the outer guide cover 311, under the combined action of airflow and structural limitation, rises together with the inner guide cover 312, thereby driving the exhalation valve core 31 to achieve a smooth axial rise until the exhaust channel 23 is opened to complete the exhaust action under positive pressure.

[0050] This invention can not only effectively solve the problem of oil and gas leakage, but also respond quickly under both positive and negative pressure conditions.

[0051] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A liquid-sealed breather valve for use in oil storage tanks, characterized in that, include: outer cylinder; The inner cylinder is coaxially fixed inside the outer cylinder. The side wall of the inner cylinder is also provided with a first through hole near the bottom and a second through hole near the top of the inner cylinder. The outer side of the inner cylinder is also provided with multiple partitions, and the multiple partitions alternately form an exhaust channel that communicates with the first through hole and an air intake channel that communicates with the second through hole. A positive pressure valve unit is coaxially disposed inside the inner cylinder; the positive pressure valve unit is provided with an exhalation valve core that can slide longitudinally along the axis of the outer cylinder; when the pressure inside the oil tank is higher than the external atmospheric pressure, the exhalation valve core will be longitudinally lifted and connected to the exhaust channel to discharge gas; The negative pressure valve unit is coaxially disposed at the top of the inner cylinder; the positive pressure valve unit is provided with an air intake valve core that can slide longitudinally along the axis of the outer cylinder; when the pressure inside the oil tank is lower than the external atmospheric pressure, the air intake valve core will be longitudinally lifted and connected to the air intake channel to draw in air.

2. The liquid-sealed breather valve for oil storage tanks according to claim 1, characterized in that, The inner cylinder is also fixedly provided with a first baffle that can intermittently block the lower end of the exhaust channel and a second baffle that can staggerly block the upper end of the intake channel at the upper and lower ends.

3. The liquid-sealed breather valve for oil storage tanks according to claim 1, characterized in that, The positive pressure valve unit is also provided with a guide chamber that can guide the air source into the inner cylinder and a guide column that can guide the breathing valve to slide axially. The guide chamber is coaxially fixed to the bottom of the inner cylinder and passes through the inner cylinder, and is used to guide the air source into the inner cylinder; The guide post is fixedly installed at the bottom of the inner cylinder and coaxially installed outside the guide chamber, forming a second annular cavity with the guide chamber.

4. A liquid-sealed breather valve for use in oil storage tanks according to claim 3, characterized in that, The positive pressure valve unit is also equipped with a sealing fluid that can seal the breathing valve core in real time; the sealing fluid is located in the second annular cavity.

5. A liquid-sealed breather valve for use in oil storage tanks according to claim 4, characterized in that, The positive pressure valve unit is also equipped with a detection tube that can detect the liquid level of the sealing fluid in real time.

6. A liquid-sealed breather valve for use in oil storage tanks according to claim 1, characterized in that, The exhalation valve core consists of an outer guide cover and an inner guide cover coaxially fixed inside the outer guide cover.

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