CN2796824Y - Side installing leak-less type biosafety cabinet of exhaust filter - Google Patents

Abstract

The utility model relates to a side installing no leakage type biologic safety cabinet of an air discharging filter, which comprises a safety cabinet body, an air conveying opening and an air discharging opening. The utility model is characterized in that a minitype positive pressure blower is arranged at the side of the high-efficiency air discharging filter; the air inlet end of the blower is arranged at the inner side of the cabinet, and is provided with a positive pressure air inlet filter; a positive pressure airflow connecting pipe at the air outlet end of the blower is connected with a positive pressure air sealing cavity between the pipe wall of the air discharging opening and the outer casing of the high-efficiency air discharging filter; the air inlet surface of the high-efficiency air discharging filter is provided with a protecting plate with a magnet. A front plate and a back wall plate of the high-efficiency air discharging filter are pasted with strip-shaped sealing pads to form the positive pressure air sealing cavity which is communicated with the periphery of the high-efficiency air discharging filter. The utility model has the advantages that air is led to the position between the pipe wall of the air discharging opening and the outer casing of the high-efficiency filter after the air is filtered, and thus, the positive pressure air sealing cavity is formed. Once installing gaps exist, high-speed dynamic airflow passing through the gaps is generated, and the high-speed dynamic airflow prevents air at the gaps of the periphery of the high-efficiency filter from flowing reversely, and no leakage air passes through the gaps. The utility model is suitable for no leakage type biologic safety cabinet of an air discharging filter.

Description

Exhaust filter side-mounted leak-free biological safety cabinet

technical field

The utility model belongs to an air conditioning purification device, in particular to a biological safety cabinet used for microbiology, biomedicine, biological products and the like.

Background technique

Biosafety technology has become a cutting-edge technology in the world today, which is directly related to the research and development of bioengineering, and to the security of the people and the country. In order to ensure the "safety" of biosafety technology and the harmlessness of the exhaust, the biosafety cabinet of the biosafety laboratory is the key equipment.

For the safety of operators and those around them, the existing biological safety cabinets isolate the polluting aerosols generated during the treatment of pathogens in the operating area. Its structural form is as follows: there is an operating compartment in the cabinet, a working window or a glove fixing port on the front of the cabinet, a double-fan sterilization pot or a transfer window on the side of the Class III cabinet, and an air supply side by side on the top of the cabinet. High-efficiency filter, air supply port and exhaust air high-efficiency filter, air exhaust port, and air flow passages are arranged inside the cabinet.

The problem is that the high-efficiency exhaust filter is placed in the exhaust port, and it is pressed against the flange frame in the exhaust pipe with a screw. Since the exhaust port and the exhaust pipe are connected as one, the exhaust fan is located on the outdoor side to draw air. , causing the air outlet surface of the exhaust air HEPA filter to be in the exhaust duct, after the exhaust air HEPA filter is installed, it is impossible to detect leaks on the air outlet surface. After it is installed, it is inevitable to leak from the installation gap between the above-mentioned flange frame and the return air tunnel, because the negative pressure difference on both sides of the gap can reach several hundred Pa, which will cause the unfiltered indoor bacterial gas to leak from the installation gap to the outside, causing environmental pollution.

Contents of the invention

The purpose of this utility model is to set a positive pressure air sealing cavity between the wall of the exhaust port and the shell of the exhaust high-efficiency filter, and set up a miniature positive pressure fan nearby, and use the harmless airflow filtered by the positive pressure air inlet filter of the indoor air Enter the positive pressure air-tight chamber. If there is an installation gap, the positive pressure airflow in the positive pressure air-tight chamber will prevent the leaking air from passing through, forming a dynamic clean airflow that squeezes out, and it is impossible to make the negative-pressure airflow inside the cabinet flow into the positive-pressure airtight chamber and then flow to the outside, which can constitute no Biological safety cabinet with leak ventilation.

The technical scheme of the utility model is a non-leakage type biological safety cabinet with a side-mounted air exhaust filter, including a safety cabinet body, a high-efficiency air supply filter and an air supply port, a high-efficiency exhaust air filter and an air exhaust port, and an air exhaust filter. The exhaust inlet of the high-efficiency filter is provided with a main sealing ring, and the exhaust outlet is provided with a compression ring and a secondary sealing ring, which are fixed on the wall of the exhaust outlet with screws and briquetting blocks. The pipe port is equipped with an exhaust fan, and a miniature positive pressure fan is installed beside the exhaust high efficiency filter. There is a positive pressure air inlet detachable orifice plate on the side. The positive pressure air flow connection pipe at the air outlet end of the fan is connected to the positive pressure air seal cavity wall between the exhaust outlet pipe wall and the exhaust high efficiency filter shell. The air outlet end of the fan The positive pressure air flow bypass pipe is connected to the side of the positive pressure air inlet filter for pressure relief when the positive pressure air flow pressure is too high. For the pressure change in the air-tight chamber, there is a protective plate with a magnet for disassembling the filter on the air inlet side of the exhaust high-efficiency filter, and on the front panel and rear wall of the exhaust high-efficiency filter, there are The front panel gasket and the rear wall panel gasket are two parallel and spaced horizontal strip gaskets, which are used to press against the front and back of the exhaust high-efficiency filter, forming a A positive-pressure air-tight cavity that runs through the periphery of the exhaust high-efficiency filter.

The utility model has the advantage that after the indoor air is filtered through the positive pressure air inlet filter, it is introduced into the space between the pipe wall of the air exhaust port and the shell of the high-efficiency filter nearby to form a positive pressure air-tight cavity. When there is an installation gap, a high-speed dynamic airflow through the gap can be generated to prevent the reverse flow of gas in the gap around the exhaust high-efficiency filter, that is, the gas without leakage passes through. This device has been tested and researched by the Air Conditioning Institute to prove that no matter how big the gap is (the compression nut is completely loosened; a strip is pressed under the sealing strip, resulting in a gap that is not tight; multiple hollow hard tubes are pressed under the sealing strip to form a leak. ), as long as a small pressure difference of ≥1Pa is maintained inside and outside the cavity, only the number of particles ≤3 particles/liter is measured on the other side of the gap. According to the "Biosafety Laboratory Building Technical Specifications" standard, only ≥3 grains/liter can be judged to have leakage, so the exhaust side of the device has no leakage.

Description of drawings

Below in conjunction with accompanying drawing and embodiment, the utility model is further described.

Fig. 1 is a schematic view of the structure of the side-mounted leak-free biological safety cabinet with the exhaust filter of the present invention

Figure 2 is a sectional view of A-A in Figure 1

Fig. 3 is a B-B sectional view of Fig. 2

In the figure, 1-exhaust high-efficiency filter, 2-main sealing ring, 3-compression ring, 4-secondary sealing ring, 5-screw, 6-briquetting block, 7-exhaust pipe, 8-exhaust fan, 9 - Miniature positive pressure fan, 10 - positive pressure air intake filter, 11 - positive pressure air intake detachable orifice plate, 12 - positive pressure air flow connection, 13 - positive pressure air seal cavity, 14 - positive pressure air flow bypass connection, 15 -pressure sensor, 16-gasket of front panel, 17-gasket of rear wall panel, 18-inside of room, 19-inside of safety cabinet, 20-shield with magnet.

Detailed ways

As can be seen from Figure 1, a side-mounted leak-free biological safety cabinet with an exhaust filter of the present invention includes a safety cabinet body, an air supply high-efficiency filter and an air supply port, an exhaust air high-efficiency filter and an air exhaust port, and an exhaust air filter. The air exhaust inlet of the wind high efficiency filter 1 is provided with a main sealing ring 2, and the exhaust air outlet is provided with a compression ring 3 and a secondary sealing ring 4, which are fixed on the wall 7 of the air exhaust port with a screw 5 and a briquetting block 6. The exhaust pipe port behind the high-efficiency air filter is provided with an exhaust fan 8, and a positive-pressure fan 9 is arranged beside the high-efficiency exhaust filter. The indoor air intake side of the positive pressure air intake filter is provided with a positive pressure air intake detachable orifice plate 11, and the positive pressure airflow connection pipe 12 at the air outlet end of the fan is connected between the wall of the exhaust port and the shell of the exhaust high efficiency filter. On the wall of the positive pressure air sealing chamber 13, the positive pressure air flow bypass connection pipe 14 of the air outlet end of the fan is connected to the positive pressure air inlet filter side, and a pressure sensor 15 for detecting pressure changes in the sealing chamber is provided in the positive pressure air sealing chamber. The air intake surface of the exhaust high efficiency filter is provided with a guard plate 20 with a magnet for removing the filter.

It can be seen from Figures 2 and 3 that on the front panel and rear wall of the high-efficiency filter, there are front panel gaskets 16 and rear wall gaskets 17, and both the front panel gasket and the rear wall gasket are two parallel There are horizontal strip-shaped gaskets with a distance between them. It is used to press against the front and back of the exhaust high-efficiency filter, and utilizes the gap of the horizontal strip-shaped gasket to form a positive pressure air-tight cavity that runs through the periphery of the exhaust high-efficiency filter.

The use method of the utility model is: after the indoor air is filtered nearby by a micro positive pressure fan, it is introduced into the air-tight cavity between the pipe wall of the exhaust outlet and the shell of the high-efficiency filter, and the pipe wall of the exhaust port and the shell of the high-efficiency filter are filled. Between them, a positive-pressure air-tight cavity is formed, and the dynamic airflow formed by positive-pressure gas prevents indoor harmful exhaust from passing through the gaps around the high-efficiency filter, and then leaks into the high-efficiency filter and then discharged to the outside, so as to achieve no leakage.

Claims (2)

1, a kind of exhaust-air filter side dress leakless type Biohazard Safety Equipment, comprise the safety cabinet cabinet, air-supply high efficiency particulate air filter and air outlet, air draft high efficiency particulate air filter and exhaust outlet, it is characterized in that, on air draft high efficiency particulate air filter side side miniature positive pressure fan is set, the air intake of blower fan is located at the indoor, be provided with malleation air intake filter, the malleation air-flow of the outlet air end of blower fan is taken over the positive pressure gas annular seal space that is connected between exhaust outlet tube wall and the air draft high efficiency particulate air filter shell, the malleation air-flow bypass of the outlet air end of blower fan is taken over and is connected to malleation air intake filter side, in the positive pressure gas annular seal space, be provided with and detect the pressure sensor that the annular seal space internal pressure changes, be provided with the backplate of the band magnet of using when being used to dismantle filter at the air intake surface of air draft high efficiency particulate air filter.

2, exhaust-air filter side dress leakless type Biohazard Safety Equipment as claimed in claim 1, it is characterized in that, on the front panel and squab panel of air draft high efficiency particulate air filter, post front panel sealing gasket and squab panel sealing gasket, the two is two parallel alternate horizontal stripe shape sealing gaskets that distance is arranged.

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