Liquid seal breather valve

Abstract

The utility model relates to the field of storage tank pressure control equipment, in particular to a liquid seal breather valve which comprises a valve body assembly, a valve body outer shell is arranged outside the valve body assembly, a liquid seal component is arranged at the bottom in the valve body outer shell, a valve bonnet used for communicating the valve body outer shell with the outside is arranged at the top of the valve body assembly, and a filtering assembly is arranged at the top in the valve body outer shell. The filtering assembly comprises at least one organic matter filtering assembly and at least one external air filtering assembly, and gas entering or being exhausted out of the valve body shell through the valve bonnet passes through the organic matter filtering assembly and the external air filtering assembly. According to the liquid seal breather valve, pollutants in air can be isolated from outside to inside, volatile matter in the storage tank is prevented from being discharged into the atmospheric environment, and complete isolation of the inside and the outside of the storage tank is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of storage tank pressure control equipment, in particular to a liquid seal breather valve. BACKGROUND

[0002] The function of the liquid breather valve is to prevent harmful gases or vapors from escaping from the breather pipe under any weather conditions. This valve can adapt to certain temperature and pressure environments and has an automatic adjustment function to maintain the sealing performance of the gas. The all-weather breather valve is usually used in toxic, harmful, flammable and explosive, corrosive working environment, such as oil refinery, chemical enterprise, pharmaceutical factory, solvent factory, oil depot and other industrial places where there are toxic, harmful, flammable and explosive medium.

[0003] However, the general liquid breather valve is completely opened when the sealing liquid reaches the pressure threshold, and the inside of the liquid breather valve and the outside environment are directly connected, which has two disadvantages, one is that the particulate matter and aerosol in the external air enter the storage tank, causing pollution inside the storage tank, and the other is that the volatile organic matter stored in the storage tank is directly discharged into the atmosphere, causing environmental pollution. SUMMARY

[0004] To solve the above problems, the utility model provides a liquid seal breather valve, which can realize the isolation of pollutants in the air from the outside to the inside, and avoid the discharge of volatile substances in the storage tank to the atmospheric environment, and realize the complete isolation of the inside and outside of the storage tank.

[0005] To achieve the above purpose, the utility model adopts the technical scheme of:

[0006] A liquid seal breather valve, comprising a valve body assembly, the outside of the valve body assembly is a valve body shell, the bottom in the valve body shell is a liquid seal part, the top of the valve body assembly is provided with a valve cap for the valve body shell and the outside to communicate,

[0007] The top of the inside of the valve body shell is provided with a filter assembly, the filter assembly comprises at least one organic matter filter assembly and at least one external air filter assembly, and the gas entering or discharging from the valve body shell through the valve cap passes through the organic matter filter assembly and the external air filter assembly.

[0008] As preferred, the external air filter assembly is adjacent to the side of the valve cap, and the organic matter filter assembly is adjacent to the side of the liquid seal part, so that the external gas enters the organic matter filter assembly after passing through the external air filter assembly in sequence.

[0009] As preferred, the external air filter assembly is attached and closed at the connection channel of the valve body assembly and the valve cap.

[0010] Preferably, the valve body shell is provided with a support near the top, and the organic matter filtering assembly is mounted on the support.

[0011] Preferably, the support is in the form of a disc structure, the outer periphery of the support is in sealing connection with the inner wall of the valve body shell, the middle part of the base of the support has a passage, and the upper surface of the base of the support forms a tubular structure, and the organic matter filtering assembly is tightly mounted in the tubular structure.

[0012] Preferably, the upper end of the tubular structure extends inwardly to form a blocking structure for limiting the organic matter filtering assembly.

[0013] The beneficial effects of the present application are as follows:

[0014] The liquid seal breathing valve of the present application increases the organic matter filtering assembly and the external air filtering assembly in the valve body shell, and the organic matter filtering assembly and the external air filtering assembly are arranged between the valve cap and the liquid seal component, so that the gas entering or discharging from the valve body shell passes through the organic matter filtering assembly and the external air filtering assembly, thereby realizing isolation of the pollutants in the air from the outside to the inside, avoiding discharge of the volatile matters in the storage tank to the atmospheric environment, and realizing complete isolation between the inside and the outside of the storage tank. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the liquid seal breathing valve of the present application.

[0016] Figure 2 Fig. 2 is a front view of the liquid seal breathing valve of the present application.

[0017] Figure 3 Fig. 3 is a sectional view along the direction of arrow A-A. Figure 2

[0018] The reference signs include:

[0019] 1 - valve body assembly, 11 - upper valve body shell, 12 - lower valve body shell, 13 - liquid storage box, 14 - connecting pipe, 15 - side pipe, 16 - return pipe, 17 - communication pipe, 18 - support, 19 - organic matter filtering assembly, 110 - external air filtering assembly, 2 - valve cap, 3 - liquid level indicator, 4 - liquid discharge valve. DETAILED DESCRIPTION

[0020] To make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with specific embodiments. It should be understood that these descriptions are only exemplary, and are not intended to limit the scope of the present application.

[0021] To solve the problem of bidirectional pollution between the inside and the outside of the storage tank, the liquid seal breathing valve of the present application is provided. Figure 1 and Figure 2 ​As shown, this embodiment proposes a liquid-sealed breather valve, which includes a valve body assembly 1. The upper part of the valve body assembly 1 has a pipe communicating with the interior of the valve body assembly 1. A valve cap 2 is installed on the pipe, and a flame arrestor plate and other related components can be installed in the valve cap 2.

[0022] A liquid level indicator 3 is installed on the side of the valve body assembly 1. The function of the liquid level indicator 3 is to form a connecting pipe 17 with the liquid sealing component inside the valve body assembly 1. The height of the local liquid level inside the liquid sealing component is displayed by the liquid level indicator 3, so as to intuitively observe the working status of the liquid sealing component inside the valve body assembly 1.

[0023] like Figure 3 As shown, a filter assembly is provided at the top inside the valve body housing. The filter assembly includes at least one organic matter filter assembly 19 and at least one external air filter assembly 110. Gas entering or exiting the valve body housing from the valve cap 2 passes through the organic matter filter assembly 19 and the external air filter assembly 110.

[0024] The external air filter assembly 110 is located near the valve cap 2, and the organic filter assembly 19 is located near the liquid seal component. External gas passes through the external air filter assembly 110 before entering the organic filter assembly 19. When external air enters the valve body, it first enters the air filter assembly, where solid impurities and aerosols are effectively filtered, preventing them from entering the storage tank. The volatile organic compounds stored in the storage tank are normally sealed by the liquid in the liquid seal assembly, preventing them from contacting the organic filter assembly 19 and forming a chemical adsorption effect. When the positive pressure in the storage tank exceeds a critical value, the liquid seal opens, and the volatile gases are filtered by the organic filter assembly 19 and then discharged into the air through the valve cap 2.

[0025] In this embodiment, the external air filter assembly 110 is attached to and enclosed in the connection channel between the valve body assembly 1 and the valve cap 2. The organic matter filter assembly 19 is mounted on the bracket 18. Specifically, the bracket 18 is located near the top of the valve body housing, and the organic matter filter assembly 19 is mounted on the bracket 18. The base of the bracket 18 is a disc structure, and the outer periphery of the bracket 18 is sealed to the inner wall of the valve body housing. The base of the bracket 18 has a channel in the middle, and the upper surface of the base of the bracket 18 forms a tubular structure, in which the organic matter filter assembly 19 is tightly installed. The upper end of the tubular structure extends inward to form a blocking structure that limits the movement of the organic matter filter assembly 19.

[0026] In this embodiment, the disc-shaped support 18 base is used to reduce the effective cross-sectional area of the upper valve body shell 11, reduce the diameter of the organic matter filter assembly 19, and reduce the amount of internal filtration. The upper surface of the base of the support 18 forms a tubular structure as the base of the installation of the organic matter filter assembly 19, which tightly matches the outer ring surface of the organic matter filter assembly 19 to form a seal, and the volatile organic matter can only flow to the bonnet 2 after being filtered inside the organic matter filter assembly 19. The blocking structure at the upper end of the tubular structure and part of the upper surface of the disc structure serve as a limiting structure to limit the displacement and deflection of the organic matter filter assembly 19.

[0027] The liquid seal breathing valve described above has an organic matter filter assembly 19 and an external air filter assembly 110 built-in, and the organic matter filter assembly 19 and the external air filter assembly 110 are arranged between the bonnet 2 and the liquid seal component. The gas entering or exiting the valve body shell passes through the organic matter filter assembly 19 and the external air filter assembly 110, which can achieve isolation of pollutants in the air from the outside to the inside, while avoiding the emission of volatile substances in the storage tank to the atmosphere, and achieving complete isolation between the inside and outside of the storage tank.

[0028] In this embodiment, the liquid seal component is arranged at the bottom of the valve body assembly 1 inside, and the corresponding structure can be selected according to the needs. In this embodiment, an embodiment is used to illustrate the selection and use of the liquid seal component in this embodiment.

[0029] The valve body assembly 1 in this embodiment includes a valve body shell, which includes an upper valve body shell 11 and a lower valve body shell 12. The upper valve body shell 11 is connected to the breathing inlet and outlet device at the top; the lower valve body shell 12 is provided with a liquid storage box 13 storing liquid seal liquid, and the center of the liquid storage box 13 is provided with a connecting pipe 14 penetrating the liquid storage box 13. The top of the connecting pipe 14 is sealed, and the top of the connecting pipe 14 is connected to a side pipe 15 with one end corresponding to the liquid storage box 13. The top of the liquid storage box 13 is provided with a return pipe 16 corresponding to the lower valve body shell 12, and a communication pipe 17 with a top higher than the top of the liquid storage box 13.

[0030] In addition, a liquid discharge valve 4 is arranged at the bottom of the liquid storage box 13, which can discharge the liquid inside the liquid storage box 13.

[0031] In general state, the liquid seal uses liquid in the liquid storage box, when the positive pressure in the storage tank does not reach the opening pressure, the liquid seal liquid blocks the communication pipe 17 and the return pipe 16, so that the storage tank is isolated from the outside, and the purpose of sealing is achieved. When the positive pressure in the storage tank reaches the opening pressure, the positive pressure in the storage tank extrudes part of the liquid seal liquid to the lower valve body shell 12 through the communication pipe 17 and the return pipe 16, so that the storage tank is communicated with the upper valve body shell 11 through the connecting pipe 14, the side pipe 15 and the communication pipe 17, and the purpose of communication between the storage tank and the outside is achieved, so that the gas in the storage tank is discharged through the breathing inlet and outlet device 2, and the problem of overpressure of the storage tank is avoided. When the negative pressure in the storage tank reaches the opening pressure, the external pressure extrudes part of the liquid seal liquid to the negative pressure liquid collecting groove at the top of the liquid storage box 13 through the communication pipe 17 and the return pipe 16, so that the tank is communicated with the upper valve body shell 11 through the connecting pipe 14, the side pipe 15 and the communication pipe 17, and the purpose of communication between the storage tank and the outside is achieved, so that the external gas can enter the storage tank through the breathing inlet and outlet device 2, and the pressure balance in the storage tank is ensured; the negative pressure liquid collecting groove at the top of the liquid storage box 13 is communicated with the liquid storage box 13 through a small opening, when the negative pressure in the storage tank decreases, the liquid seal liquid flows back to the liquid storage box 13, blocks the communication pipe 17 and the return pipe 16, so that the storage tank re-achieves the sealing state.

[0032] The above description of the liquid seal component is not a limitation of the liquid seal component, but is a description of an embodiment.

[0033] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the technical content of the present application, many changes can be made in the specific implementation mode and application range, as long as these changes do not deviate from the concept of the present application, and all belong to the protection scope of the present application.

Claims

1. A liquid sealed breathing valve, comprising a valve body assembly, a valve body shell outside the valve body assembly, a liquid seal component inside the valve body shell, and a valve cap provided at the top of the valve body assembly for the valve body shell to communicate with the outside, characterized in that: a filter assembly is provided at the top inside the valve body shell, the filter assembly comprises at least one organic matter filter assembly and at least one outside air filter assembly, and the gas entering or discharging the valve body shell from the valve cap passes through the organic matter filter assembly and the outside air filter assembly. The outside air filter assembly is adjacent to the side of the valve cap, and the organic matter filter assembly is adjacent to the side of the liquid seal component, so that the outside air passes through the outside air filter assembly and then enters the organic matter filter assembly.

2. The liquid sealed breathing valve of claim 1, wherein: The outside air filter assembly is attached and closed at the connecting channel of the valve body assembly and the valve cap.

3. The liquid sealed breathing valve of claim 1, wherein: A support is provided at the position close to the top of the valve body shell, and the organic matter filter assembly is installed on the support.

4. The liquid sealed breathing valve of claim 1, wherein: The base of the support is a disc structure, the outer periphery of the support is sealingly connected with the inner wall of the valve body shell, the base of the support has a channel in the middle, the upper surface of the base of the support forms a tubular structure, and the organic matter filter assembly is tightly installed in the tubular structure.

5. The liquid sealed breathing valve of claim 4, wherein: The upper end of the tubular structure extends inwardly to form a blocking structure for limiting the organic matter filter assembly.

6. The liquid sealed breathing valve of claim 5, wherein: ​

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