Liquid seal device for micro-pressure system

Abstract

The utility model provides a kind of liquid seal device for micro-pressure system, its technical scheme is: including air chamber and liquid storage chamber, air chamber bottom is connected with liquid storage chamber by connecting pipe, and connecting pipe penetrates the top of liquid storage chamber, and the pipe orifice of connecting pipe is below the liquid level of liquid storage chamber normal pressure time.The top of liquid storage chamber is further provided with exhaust pipe, and the bottom of air chamber is provided with air inlet pipe, and the pipe orifice of air inlet pipe is inserted into the upper half of air chamber, the beneficial effects of the utility model are: (1) completely block sealed liquid reflux, guarantee system safety and material pure;(2) flexible adaptation different micro-pressure working condition, improve device versatility;(3) real-time monitoring and active pressure control, strengthen system operation stability.

Description

Technical Field

[0001] This utility model belongs to the field of liquid seal structure technology, and in particular relates to a liquid seal device for micro-pressure systems. Background Technology

[0002] In a typical liquid seal structure, the inlet pipe is inserted into the sealing fluid. When the system is under positive pressure, the gas phase bubbles out of the sealing fluid under the system pressure. When the system is under negative pressure, the sealing fluid flows back into the inlet pipe under atmospheric pressure, forming a certain liquid column height, thus isolating the system from the external atmosphere.

[0003] When an unexpected event causes the negative pressure in the system to exceed the height of the liquid column formed in the inlet pipe, the sealing fluid may flow back into the system under the influence of the pressure difference. In operating conditions where the sealing fluid can react with or contaminate materials within the system, this structure could potentially lead to safety, environmental, or quality incidents. Summary of the Invention

[0004] To address the problem of sealing fluid backflow into micro-pressure systems in existing technologies, this utility model proposes a liquid sealing device for micro-pressure systems. The technical solution includes a gas chamber and a liquid storage chamber. The bottom of the gas chamber is connected to the top of the liquid storage chamber via a connecting pipe, which penetrates the top of the liquid storage chamber. The opening of the connecting pipe extends below the liquid surface in the liquid storage chamber at normal pressure. An exhaust pipe is also provided at the top of the liquid storage chamber, and an air inlet pipe is also provided at the bottom of the gas chamber. The opening of the air inlet pipe extends into the upper half of the gas chamber.

[0005] In a preferred embodiment, the volume of the portion below the air inlet pipe in the air chamber is greater than the volume of liquid flowing back from the liquid storage chamber to the air chamber.

[0006] In a preferred embodiment, the total volume of the connecting pipe is less than the volume of liquid flowing back from the liquid storage chamber to the gas chamber.

[0007] In a preferred embodiment, the top of the gas chamber is provided with an inert gas inlet pipe, and the side wall of the gas chamber is provided with a pressure measuring port, in which a pressure measuring device is installed.

[0008] In a preferred embodiment, the pressure measuring device inside the pressure measuring port is interlocked with the opening and closing of the inert gas inlet pipe.

[0009] In a preferred embodiment, the bottom of the air chamber is further connected to the connecting pipe via an adjusting pipe, which is used to adjust the allowable negative pressure value inside the air chamber.

[0010] In a preferred embodiment, a level gauge is provided on the side wall of the liquid storage chamber.

[0011] The beneficial effects of this utility model are: (1) The device fundamentally avoids the entry of sealing liquid into the micro-pressure system through the layered structure and volume matching design of "gas chamber-connecting pipe-liquid storage chamber": On the one hand, the pipe opening of the connecting pipe extends into the liquid storage chamber below the normal pressure liquid surface to form a basic liquid seal; on the other hand, the volume of the part below the inlet of the gas chamber is greater than the volume of the backflow liquid, which can completely accommodate the liquid backflow from the liquid storage chamber, and the total volume of the connecting pipe is less than the volume of the backflow liquid, which can prevent external air from entering the gas chamber through the liquid storage chamber to a certain extent, thus preventing the negative pressure from being destroyed. The double volume constraint ensures that the backflow liquid only stays in the lower part of the gas chamber and cannot reach the height of the inlet of the gas pipe, while also preventing external gas from entering the gas chamber and destroying the negative pressure, thus completely blocking the path of sealing liquid or external gas into the micro-pressure system, avoiding the reaction of sealing liquid with system materials or contaminating materials, and eliminating safety, environmental protection and quality accidents. (2) The adjustment pipe between the bottom of the gas chamber and the connecting pipe can be flexibly adjusted according to the "allowable negative pressure value" requirements of different micro-pressure systems (such as changing the liquid column height by adjusting the length of the pipe), so that it can be adapted to different micro-pressure scenarios without replacing the entire device; at the same time, the design of the inlet of the gas pipe extending into the upper part of the gas chamber does not affect the normal exhaust function of the gas phase entering the liquid storage chamber through the connecting pipe and then being discharged from the exhaust pipe when under positive pressure, and can also avoid liquid contact when under negative pressure, taking into account the liquid sealing requirements of both positive and negative pressure conditions, and greatly improving the applicability of the device; (3) The pressure measuring port on the side wall of the gas chamber is used in conjunction with the pressure measuring device to monitor the pressure in the gas chamber in real time, allowing maintenance personnel to intuitively grasp the micro-pressure status of the system. More importantly, the pressure measuring device is interlocked with the opening and closing of the inert gas inlet pipe. When the negative pressure of the gas chamber is detected to be close to the "maximum allowable value", the inert gas inlet pipe will automatically open to replenish the gas chamber with inert gas to balance the pressure and prevent the risk of the liquid seal system failure caused by the further increase of negative pressure. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] In the diagram: 1. Inlet pipe; 2. Pressure measuring port; 3. Gas chamber; 4. Inert gas inlet pipe; 5. Adjusting pipe; 6. Connecting pipe; 7. Liquid storage chamber; 8. Liquid level gauge; 9. Exhaust pipe. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Example like Figure 1The liquid sealing device for a micro-pressure system shown includes a gas chamber 3 and a liquid storage chamber 7. The bottom of the gas chamber 3 is connected to the top of the liquid storage chamber 7 via a connecting pipe 6, and the connecting pipe 6 penetrates the top of the liquid storage chamber 7. The top of the liquid storage chamber 7 is also provided with an exhaust pipe 9, and the bottom of the gas chamber 3 is also provided with an air inlet pipe 1. The inlet of the air inlet pipe 1 extends into the upper part of the gas chamber 3, and the inlet of the connecting pipe 6 extends below the liquid surface of the liquid storage chamber 7 at normal pressure.

[0016] Furthermore, the volume of the portion below the inlet of the air inlet pipe 1 within the air chamber 3 is greater than the volume of liquid flowing back from the liquid storage chamber 7 to the air chamber 3. This prevents the sealing liquid from being higher than the inlet of the air inlet pipe 1, causing it to enter the micro-pressure system and potentially react with the system materials or contaminate them. Furthermore, the total volume of the connecting pipe 6 is less than the volume of liquid flowing back from the liquid storage chamber 7 to the air chamber 3.

[0017] Under negative pressure conditions, sufficient liquid will first form a liquid column in the connecting pipe 6. If the volume of the connecting pipe 6 is too large, before a complete liquid column is formed, the external gas in the liquid storage chamber 7 will leak from the connecting pipe 6 into the gas chamber 3, thereby destroying the negative pressure.

[0018] Furthermore, the top of the gas chamber 3 is provided with an inert gas inlet pipe 4, and the side wall of the gas chamber 3 is provided with a pressure measuring port 2, and a pressure measuring device is installed inside the pressure measuring port 2.

[0019] Furthermore, the pressure measuring device inside the pressure measuring port 2 is interlocked with the opening and closing of the inert gas inlet pipe 4.

[0020] Furthermore, the bottom of the air chamber 3 is connected to the connecting pipe 6 via an adjusting pipe 5, which is used to adjust the allowable negative pressure value inside the air chamber 3.

[0021] The allowable negative pressure value inside the air chamber 3 is adjusted by adjusting the length of the adjusting pipe 5.

[0022] Furthermore, a level gauge 8 is provided on the side wall of the liquid storage chamber 7.

[0023] The above-mentioned device operates as follows: the air inlet pipe 1 is connected to the micro-pressure system, and the liquid storage chamber 6 maintains a certain liquid level height h, which is monitored on-site by the liquid level gauge 7. Gas in the micro-pressure system is discharged into the air chamber 3 through the air inlet pipe 1. When the system pressure increases to P ≥ ρ... 液 When gh (ρ 液 (where g is the density of the sealing fluid and g is the gravitational constant), the gas enters the storage chamber 7 through the adjusting pipe 5 and the intermediate connecting pipe 6, and is discharged into the external system through the exhaust pipe 9.

[0024] When the system pressure decreases and enters a negative pressure state, the liquid in the lower storage chamber 7, under the action of external pressure, forms a liquid column in the intermediate connecting pipe 6 and adjusting pipe 5, maintaining pressure balance. When the system pressure continues to decrease and reaches a vacuum degree P... 真 ≥-ρ 液 When g(Hh) (H is the length of connecting pipe 6; if there is adjusting pipe 5, it is the sum of the length of adjusting pipe and the length of connecting pipe 6); P 真 (For system vacuum), the sealing fluid flows back up from the liquid storage chamber 7 to the gas chamber 3. Since the inlet of the air inlet pipe 1 extends into the upper part of the gas chamber, the sealing fluid will not enter the micro-pressure system through the air inlet pipe 1.

[0025] Install a pressure measuring instrument at pressure measuring port 2 and interlock it with the inert gas protection system. When the system vacuum degree P 真 Approaching or equal to -ρ 液 g(Hh) automatically activates the inert gas filling protection, filling the gas chamber 3 with inert gas through the inert gas inlet pipe 4 to reduce the negative pressure.

Claims

1. A liquid sealing device for a micro-pressure system, comprising a gas chamber (3) and a liquid storage chamber (7), characterized in that, The bottom of the gas chamber (3) is connected to the top of the liquid storage chamber (7) through a connecting pipe (6), and the connecting pipe (6) passes through the top of the liquid storage chamber (7). The opening of the connecting pipe (6) extends into the liquid storage chamber (7) below the liquid surface at normal pressure. The top of the liquid storage chamber (7) is also provided with an exhaust pipe (9), and the bottom of the gas chamber (3) is also provided with an air inlet pipe (1). The opening of the air inlet pipe (1) extends into the upper part of the gas chamber (3).

2. The liquid sealing device for a micro-pressure system according to claim 1, characterized in that, The volume of the portion below the inlet of the air inlet pipe (1) in the air chamber (3) is greater than the volume of liquid flowing back from the liquid storage chamber (7) to the air chamber (3).

3. The liquid sealing device for a micro-pressure system according to claim 1, characterized in that, The total volume of the connecting pipe (6) is less than the volume of liquid flowing back from the liquid storage chamber (7) to the gas chamber (3).

4. The liquid sealing device for a micro-pressure system according to claim 1, characterized in that, The top of the gas chamber (3) is provided with an inert gas inlet pipe (4), and the side wall of the gas chamber (3) is provided with a pressure measuring port (2), and a pressure measuring device is installed inside the pressure measuring port (2).

5. The liquid sealing device for a micro-pressure system according to claim 4, characterized in that, The pressure measuring device in the pressure measuring port (2) is interlocked with the opening and closing of the inert gas inlet pipe (4).

6. The liquid sealing device for a micro-pressure system according to claim 1, characterized in that, The bottom of the air chamber (3) is also connected to the connecting pipe (6) by an adjusting pipe (5), which is used to adjust the allowable negative pressure value inside the air chamber (3).

7. The liquid sealing device for a micro-pressure system according to claim 1, characterized in that, The side wall of the liquid storage chamber (7) is equipped with a level gauge (8).

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