CN204730394U - The cleaning apparatus of induced draft method in application - Google Patents

Abstract

The utility model discloses a kind of cleaning apparatus applying interior induced draft method, described cleaning apparatus has and is arranged on plenum chamber in casing and aseptic operation box, this plenum chamber is connected with air-supply arrangement, negative pressuren zone is had outside this plenum chamber, air pressure in this aseptic operation box is higher than atmospheric pressure but lower than plenum chamber internal gas pressure, arrange high efficiency particulate air filter between plenum chamber and aseptic operation box.The utility model changes the pressure condition of high efficiency particulate air filter frame periphery, becomes present negative pressuren zone by original zone of positive pressure, and this change will thoroughly solve the industry difficult problem that in present all cleaning apparatus, high efficiency particulate air filter frame leaks out.

Description

Clean equipment using internal negative pressure air supply method

technical field

The utility model relates to equipment using an internal negative pressure air supply method, in particular to cleaning or purification equipment using an internal negative pressure air supply method, which changes the problem of air leakage in existing cleaning/purification equipment and is mainly suitable for biological Safety cabinets, clean benches, clean transfer windows, negative pressure weighing rooms and other clean equipment or purification equipment with local aseptic operation areas.

Background technique

The existing cleaning equipment and purification equipment on the market adopt positive pressure air supply mode, which is likely to cause leakage between the high-efficiency filter and its frame, causing indoor air to leak directly into the local sterile operation area, resulting in experimental failure Or the experimental data is inaccurate.

Contents of the invention

The purpose of this utility model is to solve the shortcomings of the above-mentioned prior art, and apply the negative pressure air supply method to clean/purify equipment, so as to completely solve the industry problem of air leakage in clean/purify equipment.

The technical solution of the utility model is based on the following internal negative pressure air supply method, which comprises:

Set up a static pressure zone;

forming a negative pressure zone outside said static pressure zone;

Set up a local aseptic operation area with an air pressure higher than atmospheric pressure but lower than the static pressure area;

A high-efficiency filter is arranged between the static pressure zone and the local sterile operation zone, and the air in the static pressure zone passes through the high-efficiency filter and enters the local sterile zone.

Further, the static pressure zone is connected to the air supply device. When the air supply device blows air into the static pressure zone, the static pressure zone forms a positive pressure zone externally, and the periphery of the static pressure zone forms a Negative pressure zone.

Due to the inflow of air in the local aseptic operation area, an air pressure slightly higher than that of the outside will be formed when it is discharged through the lower space.

There are sealing devices between the static pressure zone and the high efficiency filter and between the high efficiency filter and the local aseptic operation zone.

The negative pressure mentioned in the utility model refers to the air pressure which is relatively lower than the atmospheric pressure, and the said positive pressure refers to the air pressure which is relatively higher than the atmospheric pressure.

In the above-mentioned internal negative pressure air supply method, when the air supply device supplies air to the static pressure zone, the pressure in the static pressure zone increases, and outside the static pressure zone, due to the suction of the air supply device, an air pressure ratio of atmospheric pressure will be formed. Low negative pressure, and because the air pressure in the local aseptic operation area is lower than the static pressure area due to the air supply device sending the wind into the air and higher than the external atmospheric pressure, even if the seal between the high-efficiency filter and the local aseptic operation area exists When there is a small gap, since the negative pressure area is in a negative pressure state relative to the external atmospheric pressure, the air in the local aseptic operation area will enter the negative pressure area through the gap, so that as long as the high-efficiency filter does not leak, it will The air filtered by the filter will not enter the local sterile operation area. That is to say, as long as the high-efficiency filter itself does not leak, the local sterile operation area will never be contaminated.

The cleaning equipment provided by the utility model using the above-mentioned internal negative pressure air supply method is characterized in that: the cleaning equipment has a static pressure box and an aseptic operation box arranged in the box of the cleaning equipment, the static pressure The box is connected with the air supply device. There is a negative pressure area outside the static pressure box. The air pressure in the aseptic operation box is higher than the atmospheric pressure but lower than the air pressure in the static pressure box. The static pressure box and the aseptic operation box Set high-efficiency filter between.

The negative pressure zone is provided with an initial effect filter, and outside air enters the negative pressure zone after being filtered by the primary effect filter.

The aseptic operation box is provided with an exhaust port.

A sealing device is arranged between the static pressure box and the high efficiency filter and between the high efficiency filter and the aseptic operation box.

The cleaning equipment provided by the utility model uses the principle of the above-mentioned internal negative pressure air supply method to connect a static pressure box with the air supply device, and the lower part of the static pressure box is connected with a high-efficiency filter. When the air supply device is in operation, air is supplied (pressurized) into the static pressure box, and the air enters the aseptic operation box below through the high-efficiency filter. Since the air flows downward during the operation of the air supply device, and the primary filter has a certain wind resistance, a negative pressure zone lower than the atmospheric pressure will be formed around the static pressure box and the high efficiency filter. Even if the seal between the aseptic operation box and the high-efficiency filter frame is not tight, the air will only flow from the aseptic operation box to the negative pressure area, which will not affect the cleanliness of the aseptic operation box.

The utility model changes the pressure around the frame of the high-efficiency filter, from the original positive pressure area to the current negative pressure area. This change will completely solve the industry problem of air leakage from the frame of the high-efficiency filter in all cleaning equipment.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model cleaning equipment;

Fig. 2 is a schematic diagram of the air pressure inside the equipment when the embodiment of the cleaning equipment of the present invention is in operation.

Among them: 1-primary filter, 2-blower, 3-static pressure box, 4-high efficiency filter, 5-filter frame, 6-box, 7-sterile operation box, 8-upper box, 9 -Exhaust port.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the specific embodiment of the present utility model is further described:

The cleaning equipment provided in this embodiment is based on the following method concept:

Set a static pressure zone A, the air pressure in the static pressure zone is positive relative to the atmospheric pressure, that is, greater than the atmospheric pressure;

forming a negative pressure zone B outside the static pressure zone A;

Set up a local aseptic operation area C with an air pressure slightly higher than atmospheric pressure but lower than the static pressure area;

A high-efficiency filter is set between the static pressure area A and the local aseptic operation area C, and the air in the static pressure area A passes through the high-efficiency filter and enters the local aseptic operation area C.

The static pressure zone A is connected to the air supply device, when the air supply device blows air into the static pressure zone A, due to the resistance formed by the high efficiency filter, the static pressure zone A forms a positive pressure zone to the outside , that is, a negative pressure zone is formed on the periphery of the static pressure zone A. Due to the effect of the air supply device, the air flows from the outside of the static pressure zone A to the inside of the static pressure zone, and the outside of the static pressure zone A will generate a state of negative pressure relative to the atmospheric pressure, forming a negative pressure zone B. Since there are gaps around and above the static pressure area A, in addition to the local aseptic operation area C, the entire static pressure area A will be surrounded by negative pressure.

Due to the inflow of air in the local aseptic operation area C, when it is discharged through the lower gap, the air pressure will be slightly higher than that of the outside world, that is, the air pressure in the static pressure area A > the air pressure in the local aseptic operation area C > the atmospheric pressure > the negative pressure area B's air pressure. The size of the local aseptic operation area C higher than the external air pressure is related to the area of the lower gap. The larger the area of the lower gap, the more air is discharged, and the value of the local aseptic operation area C higher than the external air pressure is smaller. If The smaller the area of the lower gap, the less the amount of air discharged, and the larger the value of the local aseptic operation area C higher than the external air pressure.

There is a sealing device between the static pressure area A and the high-efficiency filter and between the high-efficiency filter and the local sterile operation area C.

Fig. 1 is an embodiment of a kind of cleaning equipment provided according to the principle of the above-mentioned internal negative pressure air supply method. The blower 2 of wind device is arranged on the top of this static pressure box 3, and the below of this static pressure box 3 is an aseptic operation box 7, and the bottom of this aseptic operation box 7 is provided with air outlet 9, static pressure box 3 and A high-efficiency filter 4 is arranged between the bacteria operation boxes 7, and the high-efficiency filter 4 is fixed on the filter frame 5. The static pressure box 3 is a static pressure area A, and the upper box body 8 outside the static pressure box 3 is a negative pressure area B. The aseptic operation box 7 forms a local aseptic operation area C, and the local aseptic operation area The air pressure in C is higher than the atmospheric pressure but lower than the air pressure in the static pressure box 3, that is, the static pressure zone A.

The top of the upper box body 8 outside the static pressure box 3 is provided with a primary effect filter 1, and the outside air enters the negative pressure zone B after being filtered by the primary effect filter 1.

A sealing strip as a sealing device is arranged between the static pressure box 3 and the high efficiency filter 4 and between the high efficiency filter 4 and the aseptic operation box 7 .

Please refer to shown in Figure 2, when air blower 2 is running, air is sucked into static pressure box 3, and pressure in static pressure box 3 increases, and air is sent into high-efficiency filter 4, and air flows through high-efficiency filter 4, and the air in the air is removed After the dust is filtered, the clean air enters the aseptic operation box 7 . When the air blower 2 is running, air is sucked into the static pressure box 3, and a negative pressure area B is formed in the upper box body 8 to generate a negative pressure lower than atmospheric pressure. The outside air enters the negative pressure area after being filtered by the primary filter 1. B, the greater the resistance generated by the primary filter 1, the greater the negative pressure in the negative pressure area B relative to the outside world.

Due to the inflow of air in the aseptic operation box 7, it will form slightly higher than the outside world but less than the air pressure in the static pressure box 3 when it is discharged through the lower air outlet 9. When the seal between the high-efficiency filter 4 and the filter frame 5 is not better, or when there is a small gap between the filter frame 5 and the box body 6 of the equipment, since the negative pressure zone B is in a negative pressure state relative to the outside world, the air in the aseptic operation box 7 will enter the negative pressure zone B through the gap, so that , as long as the high-efficiency filter 4 itself does not leak, the entire aseptic operation box 7 will not have air that has not been filtered by the high-efficiency filter 4 to enter, as long as the high-efficiency filter 4 does not leak, the aseptic operation box 7 will never appear Contamination.

Claims (4)

1. A kind of clean equipment that uses internal negative pressure air supply method, it is characterized in that: described clean equipment has a static pressure box and an aseptic operation box that are arranged on the casing of described clean equipment, this static pressure box and The air supply device is connected. There is a negative pressure area outside the static pressure box. The air pressure in the aseptic operation box is higher than the atmospheric pressure but lower than the air pressure in the static pressure box. Set up high efficiency filters. 2. The cleaning equipment using the internal negative pressure air supply method according to claim 1, characterized in that: the negative pressure zone is provided with a primary filter, and the outside air enters the filter after being filtered by the primary filter. Negative pressure zone. 3. The cleaning equipment applying the internal negative pressure air supply method according to claim 1, characterized in that: the aseptic operation box is provided with an exhaust port. 4. The cleaning equipment using the internal negative pressure air supply method according to claim 1, characterized in that: a seal is set between the static pressure box and the high-efficiency filter and between the high-efficiency filter and the aseptic operation box device.