A laboratory fume hood pressure relief device

Abstract

The utility model discloses a laboratory fume hood pressure relief device, including fume hood pressure relief pipe, the top of fume hood pressure relief pipe is fixedly arranged with fixed flange, and the top of fixed flange is installed with release pipe, and the bottom of release pipe is fixedly arranged with fixed flange, and fume hood pressure relief pipe and release pipe are fixedly connected through two groups of fixed flanges, and fume hood pressure relief pipe and release pipe are installed with pressure relief mechanism between, and the middle part of pressure relief mechanism is provided with pressure relief piece, and the top of release pipe is fixedly installed with exhaust pipe, and the end that exhaust pipe is away from release pipe is provided with neutralization groove, and exhaust pipe end is inserted in the inside of neutralization groove. The laboratory fume hood pressure relief device, the gas of acidity in the inside of fume hood enters the inside of exhaust pipe and enters the inside of neutralization groove, makes the acidic gas enter the neutralization work in the inside of neutralization groove, produces harmless salt and water, avoids acidic gas direct drainage to the inside of workshop space, avoids the pollution workshop air environment.

Description

Technical Field

[0001] This utility model relates to the field of fume hood safety equipment, specifically a pressure relief device for a laboratory fume hood. Background Technology

[0002] The most important function of a fume hood is exhaust. In chemical laboratories, various harmful gases, odors, moisture, and flammable, explosive, and corrosive substances are generated during experiments. In order to protect the safety of users and prevent pollutants from spreading into the laboratory, fume hoods are used near the source of pollution. During the use of fume hoods, pressure will be generated. Excessive pressure will cause accidents, so it is necessary to release pressure regularly. Current pressure relief devices have poor pressure relief effect and are troublesome to operate. To address the aforementioned issues, a search revealed Chinese patent CN214367999U, which discloses a safety pressure relief device for a fume hood. The device includes a pressure relief cover, with an integrally formed and connected mounting cover at its bottom. A dustproof component is detachably mounted inside the pressure relief cover near its top. Below the dustproof component is a baffle movably mounted inside the pressure relief cover. One end of the baffle is fixed to the pressure relief cover via a connecting shaft, and the other end is movably mounted to the pressure relief cover via a connector. A limiter fixed to the pressure relief cover is detachably mounted on the connector. A base plate is detachably mounted at the bottom of the mounting cover, and several air inlet slots are provided on one side of the mounting cover. While the aforementioned device can relieve pressure inside the fume hood by opening the limit switch when the pressure is too high, causing the baffle to rotate under pressure and forming a pressure relief channel between the baffle and the pressure relief cover, and the dustproof components can prevent dust from entering the fume hood after entering the pressure relief cover and affecting its use, and it has a good pressure relief effect and is convenient to operate, in actual use, laboratory fume hoods using the above device for pressure relief are prone to releasing acidic gases such as HCl, SO2 and NO2, which can easily pollute the workshop environment. Utility Model Content

[0003] The purpose of this invention is to provide a pressure relief device for a laboratory fume hood to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, a pressure relief device for a laboratory fume hood is provided, comprising a fume hood pressure relief pipe, a fixed flange fixedly installed at the top of the fume hood pressure relief pipe, a release pipe installed above the fixed flange, a fixed flange fixedly installed at the bottom of the release pipe, the fume hood pressure relief pipe and the release pipe being fixedly connected by two sets of fixed flanges, a pressure relief mechanism installed between the fume hood pressure relief pipe and the release pipe, a pressure relief plate provided in the middle of the pressure relief mechanism, an exhaust pipe fixedly installed at the top of the release pipe, a neutralization groove provided at the end of the exhaust pipe away from the release pipe, and the end of the exhaust pipe being inserted into the interior of the neutralization groove.

[0005] Preferably, a fixed platform is provided on the inner wall of the pressure relief pipe of the fume hood, and a positioning frame is screwed into the fixed platform, with a filter cartridge fixedly installed at the end of the positioning frame.

[0006] Preferably, the filter cartridge is conical, with multiple sets of filter holes evenly distributed on it. The filter cartridge and the pressure relief plate are arranged opposite to each other, and the pressure relief plate has an arc-shaped cross-section.

[0007] Preferably, the fume hood pressure relief pipe is connected to the neutralization tank in sequence through a release pipe and an exhaust pipe. The neutralization tank is filled with Na2CO3 solution, and a fixing seat is provided on the side wall of the neutralization tank.

[0008] Preferably, the pressure relief mechanism further includes weft grooves and warp grooves, with multiple sets of weft grooves and warp grooves arranged at equal intervals, and the multiple sets of weft grooves and warp grooves are distributed in a cross pattern.

[0009] Preferably, an installation ring is fixedly provided on the outer circumference of the pressure relief mechanism, and the installation ring is fixedly clamped between the fixed flanges on the pressure relief pipe and the release pipe of the fume hood and fixed by bolts.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. This solution allows acidic gases inside the fume hood to enter the exhaust pipe and then the neutralization tank after the pressure relief plate ruptures. This neutralization process produces harmless salt and water, preventing the acidic gases from being directly discharged into the workshop space and thus avoiding pollution of the workshop air environment.

[0011] 2. This solution ensures that the pressure of the medium within the fume hood system is within the normal range, and the pressure on the pressure relief plate is less than its design burst pressure. At this time, the pressure relief plate remains intact, and the sealing structure blocks the inlet and outlet, ensuring normal flow of the medium within the system without leakage. When the pressure in the fume hood system rises abnormally and exceeds the design impact pressure of the pressure relief plate, the pressure relief plate will rupture due to the stress exceeding the material's strength limit, ensuring rapid release of internal pressure in the fume hood and preventing prolonged overpressure. This allows the fume hood system pressure to quickly drop to a safe range. 3. This solution features weft and warp grooves on the inner wall of the pressure relief plate. The intersecting groove design allows for precise control of the stress concentration point and rupture path of the pressure relief plate, ensuring rapid and neat fracture along the preset groove lines during explosion. This avoids blockage of the pressure relief channel caused by flying fragments or irregular tearing. The equidistantly distributed groove structure ensures uniform stress on the pressure relief plate, guaranteeing the accuracy and consistency of the explosion pressure and reducing explosion pressure errors caused by uneven materials or force deviations. Attached Figure Description

[0012] Figure 1 This is a front view schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A bottom view; Figure 3 for Figure 1 Top view; Figure 4 for Figure 1 Rear view; Figure 5 This is a schematic diagram of the pressure relief mechanism of this utility model; Figure 6 This is a bottom view of the pressure relief mechanism of this utility model.

[0013] The following are the labels in the diagram: 1. Fume hood pressure relief pipe; 2. Fixed platform; 3. Positioning frame; 31. Filter cartridge; 4. Fixed flange; 5. Release pipe; 6. Pressure relief mechanism; 61. Pressure relief plate; 62. Weft groove; 63. Warp groove; 7. Exhaust pipe; 8. Neutralization tank. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-6 This utility model provides a pressure relief device for a laboratory fume hood, including a fume hood pressure relief pipe 1. A fixed flange 4 is fixedly installed on the top of the fume hood pressure relief pipe 1. A release pipe 5 is installed above the fixed flange 4. A fixed flange 4 is fixedly installed at the bottom of the release pipe 5. The fume hood pressure relief pipe 1 and the release pipe 5 are fixedly connected by two sets of fixed flanges 4. A pressure relief mechanism 6 is installed between the fume hood pressure relief pipe 1 and the release pipe 5. A pressure relief plate 61 is provided in the middle of the pressure relief mechanism 6. An exhaust pipe 7 is fixedly installed on the top of the release pipe 5. A neutralization groove 8 is provided at the end of the exhaust pipe 7 away from the release pipe 5. The end of the exhaust pipe 7 is inserted into the interior of the neutralization groove 8.

[0016] Working Principle: In actual use, when the internal pressure of the fume hood is too high and pressure relief is required, the high-pressure gas inside the fume hood impacts the inside of the fume hood pressure relief pipe 1 and strikes the surface of the pressure relief plate 61 on the pressure relief mechanism 6. The pressure relief plate 61 is a metal diaphragm, such as aluminum, copper, or nickel alloy. When the pressure relief plate 61 is not activated, the sealing ring ensures that the fume hood pressure relief pipe 1 and release pipe 5 do not leak. When the medium pressure inside the fume hood system is within the normal range, the pressure on the pressure relief plate 61 is less than its design burst pressure. At this time, the pressure relief plate 61 remains intact. The system uses a sealed structure to block the inlet and outlet, ensuring normal flow of the medium within the system without leakage. When the pressure in the fume hood system rises due to an abnormality and exceeds the design impact pressure of the pressure relief plate 61, the pressure relief plate 61 will rupture due to the stress exceeding the material strength limit, ensuring rapid release of internal pressure in the fume hood and preventing prolonged overpressure. This allows the fume hood system pressure to quickly drop to a safe range. Since the pressure relief plate 61 is completely ineffective once ruptured and cannot be reset, the rupture valve is a one-time use device. After activation, the system must be shut down and the pressure relief plate 61 replaced before it can be put back into use. After the pressure relief plate 61 ruptures, the acidic gas inside the fume hood enters the exhaust pipe 7 and then the neutralization tank 8, allowing the acidic gas to be neutralized inside the neutralization tank 8, producing harmless salt and water. This prevents the acidic gas from being directly discharged into the workshop space and avoids polluting the workshop air environment.

[0017] A fixed platform 2 is provided on the inner wall of the fume hood pressure relief pipe 1. A positioning frame 3 is screwed into the inside of the fixed platform 2, and a filter cartridge 31 is fixedly installed at the end of the positioning frame 3.

[0018] The filter cylinder 31 is conical, and multiple sets of filter holes are evenly opened on the filter cylinder 31. The filter cylinder 31 and the pressure relief plate 61 are arranged opposite to each other, and the pressure relief plate 61 has an arc-shaped cross section.

[0019] In a preferred embodiment, the fume hood pressure relief pipe 1 is connected to the neutralization tank 8 via the release pipe 5 and the exhaust pipe 7 in sequence. The neutralization tank 8 contains a Na2CO3 solution and has a fixing seat on its side wall.

[0020] The pressure relief mechanism 6 also includes a weft groove 62 and a warp groove 63. Multiple sets of weft grooves 62 and warp grooves 63 are arranged at equal intervals, and the multiple sets of weft grooves 62 and warp grooves 63 are distributed in a cross pattern.

[0021] An installation ring is fixedly installed on the outer circumference of the pressure relief mechanism 6, and the installation ring is fixedly clamped between the fixed flange 4 on the pressure relief pipe 1 and the release pipe 5 of the fume hood and fixed by bolts.

[0022] like Figure 1 , Figure 4 and Figure 5As shown: The inner wall of the pressure relief plate 61 is provided with a weft groove 62 and a warp groove 63. Through the intersecting warp and weft groove design, the stress concentration point and rupture path of the pressure relief plate 61 can be precisely controlled, ensuring that it breaks quickly and neatly along the preset groove line during explosion, avoiding blockage of the pressure relief channel caused by fragments flying or irregular tearing; the equidistantly distributed groove structure makes the pressure relief plate 61 uniformly stressed, ensuring the accuracy and consistency of the explosion pressure, and reducing the explosion pressure error caused by uneven material or force deviation; at the same time, the intersecting groove can further shorten the explosion response time by weakening the thickness of specific areas without reducing the overall strength of the pressure relief plate 61, making the pressure relief during overpressure more rapid and reliable, especially suitable for fume hoods with high requirements for explosion accuracy and action speed.

[0023] The internal positioning of the fume hood pressure relief pipe 1 is equipped with a filter cartridge 31, which can filter the exhaust gas when the fume hood is exhausted through the fume hood pressure relief pipe 1 due to overpressure or other reasons. This effectively intercepts harmful large-sized particles and prevents them from being directly discharged into the environment and causing pollution. At the same time, it protects the downstream pipes or equipment of the fume hood pressure relief pipe 1 from blockage, thus meeting the equipment protection needs.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure relief device for a laboratory fume hood, comprising a fume hood pressure relief pipe (1), characterized in that: A fixed flange (4) is fixedly installed on the top of the fume hood pressure relief pipe (1), a release pipe (5) is installed above the fixed flange (4), a fixed flange (4) is fixedly installed at the bottom of the release pipe (5), the fume hood pressure relief pipe (1) and the release pipe (5) are fixedly connected by two sets of fixed flanges (4), a pressure relief mechanism (6) is installed between the fume hood pressure relief pipe (1) and the release pipe (5), a pressure relief plate (61) is provided in the middle of the pressure relief mechanism (6), an exhaust pipe (7) is fixedly installed on the top of the release pipe (5), a neutralization tank (8) is provided at the end of the exhaust pipe (7) away from the release pipe (5), and the end of the exhaust pipe (7) is inserted into the interior of the neutralization tank (8).

2. The pressure relief device for a laboratory fume hood according to claim 1, characterized in that: A fixed platform (2) is provided on the inner wall of the pressure relief pipe (1) of the fume hood. A positioning frame (3) is screwed into the inside of the fixed platform (2). A filter cartridge (31) is fixedly installed at the end of the positioning frame (3).

3. The pressure relief device for a laboratory fume hood according to claim 2, characterized in that: The filter cylinder (31) is conical, and multiple sets of filter holes are evenly opened on the filter cylinder (31). The filter cylinder (31) and the pressure relief plate (61) are arranged opposite to each other, and the pressure relief plate (61) has an arc-shaped cross section.

4. The pressure relief device for a laboratory fume hood according to claim 1, characterized in that: The pressure relief pipe (1) of the fume hood is connected to the neutralization tank (8) in sequence through the release pipe (5) and the exhaust pipe (7). The neutralization tank (8) is filled with Na2CO3 solution and has a fixing seat on the side wall.

5. A pressure relief device for a laboratory fume hood according to claim 1, characterized in that: The pressure relief mechanism (6) also includes a weft groove (62) and a warp groove (63). Multiple sets of weft grooves (62) and warp grooves (63) are equidistantly arranged, and the multiple sets of weft grooves (62) and warp grooves (63) are distributed in a cross pattern.

6. A pressure relief device for a laboratory fume hood according to claim 5, characterized in that: An installation ring is fixedly provided on the outer circumference of the pressure relief mechanism (6), and the installation ring is fixedly clamped between the fixed flange (4) on the pressure relief pipe (1) and the release pipe (5) of the fume hood and fixed by bolts.

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