CN205307997U - High efficiency filter case - Google Patents

Abstract

The utility model relates to the field of biological safety, and provides a high-efficiency filter box, which includes an air inlet pipe and an air outlet pipe, and a disinfection port is arranged on the air inlet pipe and the air outlet pipe, and at least one is arranged between the air inlet pipe and the air outlet pipe. A group of filter devices; the filter device is provided with a primary filter unit, a medium filter unit and a high efficiency filter unit group in sequence along the air flow direction. The utility model provides a high-efficiency filter box with convenient installation, simple operation and reduced safety risk of accidents.

Description

A high-efficiency filter box

technical field

The utility model belongs to biological safety, that is, the filtration of laboratories, production workshops, experimental animal rooms, hospital negative pressure isolation areas, and industrial chemical production and storage areas where microorganisms or harmful particles will spread through gas, and the air delivery and exhaust systems. Product areas that prevent microorganisms or harmful particles from escaping with the air.

Background technique

Biosafety laboratories, biosafety workshops, infectious disease hospitals and other institutions will produce harmful biological factors during their work. These biological factors can be transmitted through aerosols. Therefore, the air in these areas is not treated and discharged into the atmosphere, which will affect the surrounding environment. The environment causes pollution, and even threatens the life and health of people or animals. Therefore, it must be filtered through a high-efficiency filter before it can be safely discharged. The "General Requirements for Laboratory Biosafety" (GB19489‐2008) clearly stipulates that it should be possible to sterilize, sterilize and detect leaks in situ on the exhaust HEPA filter. And existing technology is to adopt bag-in-bag-out filter equipment and biosafety replacement filter device, and these equipments have following shortcoming:

1. All use sealed plastic bags. Take out the filter to be replaced from the box, seal it with plastic scissors, and then process it. When installing a new filter, you must also tear off the original cut plastic bag and install the filter. Finally, use the same method to take out the old plastic bag for processing, which requires the operator to be very careful. Once the operation is wrong, the bag is broken, and the harmful particles will overflow with the aerosol, which will be irreparable. At the same time, the bag must be replaced every time it is replaced. Pour from one groove to another. During this operation, there is a factor of microbial leakage, which is cumbersome and inefficient, and there is a factor of leakage.

2. Although the biosafety replacement filter device has in-situ disinfection measures, it only targets the disinfection of ventilation pipes and box parts, ignoring the disinfection of auxiliary pipes such as differential pressure detection. There are factors that may cause microbial leakage due to incomplete disinfection, especially When the differential pressure gauge needs to be calibrated and replaced, microbial leakage in the differential pressure gauge pipeline cannot be avoided.

3. Although the existing equipment has an on-line monitoring device, the uniform device after PAO injection is not installed, and the PAO cannot be evenly distributed on the surface of the high-efficiency filter, so the accuracy of the monitoring results cannot be guaranteed.

4. Although the existing equipment has in-situ disinfection measures, it is unable to monitor the disinfection process. When the equipment is abnormal, it cannot fully ensure that all parameters meet the requirements for disinfection within the specified time.

5. The existing equipment is a whole box. The interior of the box is divided into several channels by partitions. Due to the limitation of processing, installation and transportation, too many filters cannot be installed. The processing capacity is limited and it is not suitable for large air volume. occasion use.

Utility model content

In order to solve the technical problems existing in the background technology, the utility model proposes a filter device for a high-efficiency filter box. The filter device includes a plurality of filter units, and each filter unit can handle the difference in air volume and use function. Combination on demand solves the problem of inconvenient processing, installation and transportation, and can meet the requirements of large air volume processing capacity through multi-unit combination. In order to ensure the uniformity of PAO dust generation, the filter unit is specially designed with a PAO uniform unit to ensure the accuracy of the integrity test of the filter unit. The filter unit is designed with a differential pressure gauge installation pipeline disinfection interface and a disinfectant circulation pipeline, and a special sensor is installed inside the filter unit to ensure that each parameter reaches the value required for disinfection during the entire disinfection process, ensuring filtration The unit is thoroughly sterilized, thereby eliminating the need for plastic bags, simplifying the process of replacement operations and avoiding the risk of biosafety accidents during the replacement process.

The technical scheme of the utility model is: a high-efficiency filter box, including an air inlet pipe and an air outlet pipe, the above air inlet pipe and the air outlet pipe are provided with a disinfection port, and its special feature is that the above air inlet pipe and the air outlet pipe At least one set of filtering devices is arranged between the pipelines; the above-mentioned filtering devices are arranged in sequence along the air flow direction with a primary filter unit, a medium filter unit, and a high efficiency filter unit group;

The above-mentioned high-efficiency filter unit group includes a first high-efficiency filter unit and a second high-efficiency filter unit;

A first PAO flow equalization unit is arranged between the medium-efficiency filter unit and the first high-efficiency filter unit;

A second PAO flow equalization unit is arranged between the first high-efficiency filter unit and the second high-efficiency filter unit;

The first high-efficiency filter unit and the second high-efficiency filter unit are respectively provided with an upstream detection port and a PAO sampling port for monitoring the PAO concentration;

The above-mentioned primary filter unit, medium filter unit and high efficiency filter unit group are all equipped with pressure gauges for judging whether the filter is clogged or leaked;

A humidity probe and a formaldehyde concentration probe are arranged on the air outlet duct.

The two sides of the above-mentioned pressure gauge are also respectively provided with pressure gauge disinfection ports for disinfection of the auxiliary pipeline for pressure detection;

A ball valve and a cam locking quick connector that can be quickly connected during the disinfection process are arranged on the interface of the disinfection port and the pressure gauge disinfection port.

The utility model has the advantages that: the utility model sterilizes the pressure detection auxiliary pipeline while sterilizing the ventilation pipeline of the high-efficiency filter box, and monitors various parameters during the disinfection process, which has ensured that the disinfection is complete and can effectively improve the disinfection efficiency. Effect, reduce the potential safety hazards caused by incomplete disinfection.

The filter device of the utility model includes a plurality of filter units, and each filter unit can be combined according to needs by dealing with the difference in air volume and use function, which solves the problem of inconvenient processing, installation and transportation, and can be combined by multiple units. In order to meet the requirements of large air volume handling capacity.

In order to ensure the uniformity of PAO dust generation, the filter unit of the utility model is specially designed with a PAO uniform unit to ensure the accuracy of the integrity test of the filter unit.

The filter unit of the utility model is designed with a differential pressure meter installation pipeline disinfection interface and a disinfectant circulation pipeline, and a special sensor is installed inside the filter unit to ensure that each parameter reaches the value required for disinfection during the entire disinfection process. Ensure that the filter unit is thoroughly sterilized, thereby eliminating the need for plastic bags, simplifying the process of replacement operations, and avoiding the risk of biosafety accidents during the replacement process.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a side view of the utility model;

Fig. 3 is a structural schematic diagram of the scanning mechanism of the utility model;

Fig. 4 is a structural schematic diagram of the current equalizing unit of the present invention;

Fig. 5 is a top view of the utility current equalizing unit;

Among them: 1‐air inlet duct; 2‐primary filter unit; 3‐medium filter unit; 4‐PAO dust outlet; 5‐flow equalization unit; 6‐PAO upstream sampling port; 7‐high efficiency filter unit group; 8 ‐PAO downstream detection port; 9‐automatic scanning device servo motor connection port; 10‐humidity probe; 11‐formaldehyde concentration probe; 12‐disinfectant outlet; Disinfectant circulation valve; 16-disinfectant outlet valve; 17-disinfectant outlet; 18-pressure gauge; 19-disinfectant injection port; 20-disinfectant injection port valve; 21-pressure gauge high-pressure side valve; 22-high efficiency Filter differential pressure detection device; 23-medium-efficiency filter pressure differential detection device; 24-primary-effect filter pressure differential detection device; 25-disinfectant injection port.

detailed description

Referring to Figure 1-3, a high-efficiency filter box includes an air inlet duct 1 and an air outlet duct 13, and a disinfection port is arranged on the air inlet duct 1 and the air outlet duct 13, and at least A group of filter devices is provided; the filter device is provided with a primary filter unit 2, a medium filter unit 3, and a high efficiency filter unit group 7 in sequence along the air flow direction; the high efficiency filter unit group 7 includes a first high efficiency filter unit and a second high efficiency filter unit; A first PAO flow equalizing unit is arranged between the medium-effect filter unit 3 and the first high-efficiency filter unit; a second PAO flow-equalizing unit is arranged between the first high-efficiency filter unit and the second high-efficiency filter unit; the first high-efficiency filter unit and the The second high-efficiency filter unit is respectively provided with an upstream detection port and a PAO sampling port 6 for monitoring the PAO concentration; the primary filter unit 2, the medium-efficiency filter unit 3, and the high-efficiency filter unit group 7 are all provided with filters for judging whether the filter is blocked Or a leaking pressure gauge 18; a humidity probe 10 and a formaldehyde concentration probe 11 are arranged on the air outlet duct 1. The two sides of the pressure gauge 18 are respectively provided with a pressure gauge disinfection port for disinfection of the pressure detection auxiliary pipeline; the connection between the disinfection port and the pressure gauge disinfection port is provided with a ball valve and a cam lock quick connector that can be quickly connected during the disinfection process.

The air inlet duct 1 is connected to the exhaust duct of the biosafety area, and the air outlet duct 13 is connected to the exhaust fan. After the number handle of the filter box is selected with reference to the air volume, the utility model can be practical. The exhaust air in the biosafety area is filtered by the primary filter unit 2, the medium filter unit 3, and two high-efficiency filter boxes 7 to remove the microorganisms that pollute the environment and endanger the safety of personnel and then discharge into the natural environment. Wherein the primary filter unit 2 and the medium filter unit 3 have a certain protective effect on the high-efficiency filter box 7, and avoid frequent replacement of the high-efficiency filter box 7. During use, the pressure detection pipeline is located on the right side of the filter box, together with the two sides of the filter, the pressure on both sides is displayed by the pressure gauge 18, and it can be judged whether the filter is blocked or leaked according to the pressure data. If the pressure is abnormal, replace the filters of the primary filter unit 2 and the medium filter unit 3, and perform an integrity test on the high-efficiency filter box. Inject PAO into the upstream of the high-efficiency filter through the dust-generating port 4, pass through the PAO uniform section to make the concentration uniform, and monitor the PAO concentration at both ends of the high-efficiency filter at the upstream detection port and PAO sampling port 6 respectively, and calculate the leakage rate. If the leakage rate exceeds the standard, the high-efficiency filter must be replaced. When the equipment is used for a certain period of time or when leak detection is required, it must be disinfected in situ. A circulation disinfection system can be formed through the disinfection port to disinfect the equipment and pressure detection pipelines. During the disinfection process, the disinfection parameters are monitored by the humidity probe 10 and the formaldehyde concentration probe 11 to ensure the disinfection effect.

The preferred implementation of exhaust air in biosafety areas:

According to the regulations of GB19489‐2008 and GB50346‐2011, the exhaust air in the biosafety area must be filtered through a double-layer high-efficiency filter before being discharged. Filter unit + air flow uniform unit + high-efficiency filter unit + air outlet duct combination to select the unit function, and at the same time select the number of filter units according to the air volume and unit specifications, and assemble the units. After the assembly is completed, put the air inlet pipe 1 Link to each other with the exhaust duct of biosafety area, the air outlet duct 13 links to each other with exhaust fan, the utility model just can use. The exhaust air in the biosafety zone is filtered by the primary filter unit 2, the medium filter unit 3, and the two high-efficiency filter units 7 to remove the microorganisms that pollute the environment and endanger the safety of personnel and then discharge into the natural environment. Among them, the role of primary filter unit 2 and intermediate filter unit 3 is to protect high-efficiency filter unit 7, prolong the service life of high-efficiency filter unit, and reduce operating costs. In the actual situation, the primary filter unit is omitted, or the primary filter unit and the medium filter unit are omitted at the same time. During use, the differential pressure detection devices 20, 21, and 22 monitor the differential pressure on both sides of each layer of filter in real time, and display the differential pressure on both sides on the differential pressure gauge 17. The differential pressure gauge 17 has a signal output function. The differential pressure is transmitted to the monitoring computer. When the differential pressure is lower or higher than the set value, it indicates that the filter is leaking or blocked, and the system will automatically alarm. At this time, the filter in the corresponding filter unit should be replaced.

The preferred implementation of air supply as a biosafety area:

The high-efficiency air supply filter in the biosafety area is the boundary of the biosafety area. The traditional method is to install the high-efficiency filter at the air supply outlet of the room, so that once it needs to be replaced, the entire biosafety area needs to be disinfected, and then the high-efficiency filter can be removed. This equipment can be installed on the air supply system of the biosafety area. When it needs to be replaced, close the biological airtight valves on both sides, carry out independent disinfection, and then replace the high-efficiency filter, so as not to affect the operation of the entire biosafety area. When it is implemented as an air supply, since the primary filter and medium filter are generally installed inside the air conditioning unit, we select the function in the form of a combination of air inlet pipe + airflow uniform unit + high efficiency filter unit + air outlet pipe. At the same time, according to the air volume and unit specifications, select the number of filter units and assemble the units. After the assembly is completed, connect the air inlet duct 1 with the air supply duct of the air conditioner in the biosafety area, and connect the air outlet duct 13 with the room air supply duct. , the utility model just can use. The air supply in the biosafety area enters the room after being filtered by the high-efficiency filter unit 7.

Prefer filter equipment for integrity testing.

Connect the servo motor of the detection device to the connection port of the servo motor, connect the dust generation equipment to the dust generation port 4, connect the detection instrument to the upstream detection port 6 and the PAO sampling port 8, inject PAO from the dust generation port 4, and pass through the airflow The uniform section makes the concentration uniform. After the detection instrument shows that the upstream concentration reaches the standard, observe the downstream PAO concentration value and calculate the leakage rate. If the leakage rate exceeds the standard, the high efficiency filter must be replaced.

Preferable overall in-situ disinfection of filtration equipment:

Close the biological airtight valves of the air inlet and air outlet of the device, open the disinfectant circulation valve 15 of the pressure difference detection device, connect the interface of the disinfection equipment with the disinfection equipment injection port 25 and the disinfectant outlet 12 respectively, open the disinfection equipment, and the disinfectant passes through the filter The device circulates to sterilize the filter device, while the sensors 10 and 11 monitor the disinfection parameters to ensure the disinfection effect. When the disinfection time arrives and the disinfection is completed, the filter device can be opened to replace the filter.

Preferred differential pressure gauge replacement, calibration and disinfection:

Close the valve 14 on the low pressure side of the differential pressure gauge and the valve 21 on the high pressure side of the differential pressure gauge, connect the disinfection equipment with the disinfectant injection port 17 and the disinfectant outlet 19, open the disinfectant injection port valve 16, the disinfectant outlet valve 20, and the disinfectant circulation The valve 15 is used to open the disinfection equipment for circulation disinfection. After the disinfection is finished, the differential pressure gauge can be removed for replacement and calibration.

Claims (4)

1. an efficient strumbox, comprises intake stack and wind pipe, and described intake stack and wind pipe are provided with sterilization mouth, it is characterised in that: at least it is provided with one group of filtration unit between described intake stack and wind pipe; Described filtration unit is along flow of air to being disposed with primarily efficient filter unit, medium air filtration unit, efficient filtering unit group;

Described efficient filtering unit group comprises the first efficient filtering unit and the 2nd efficient filtering unit;

It is provided with a PAO current-sharing unit between described medium air filtration unit and the first efficient filtering unit;

It is provided with the 2nd PAO current-sharing unit between described first efficient filtering unit and the 2nd efficient filtering unit;

Described first efficient filtering unit and the 2nd efficient filtering unit are respectively arranged with and carry out the upstream detection mouth monitored and PAO thief hole for PAO concentration;

Described primarily efficient filter unit, medium air filtration unit, efficient filtering unit group are provided with for judging the tensimeter whether strainer blocks or reveal.

2. the efficient strumbox of one according to claim 1, it is characterised in that: described wind pipe is provided with moisture probe and concentration of formaldehyde probe.

3. the efficient strumbox of one according to claim 1 and 2, it is characterised in that: described tensimeter both sides are also respectively arranged with the sterilization mouth of the tensimeter for being sterilized by pressure detection subsidiary pipeline.

4. the efficient strumbox of one according to claim 3, it is characterised in that: the interface of described sterilization mouth and tensimeter sterilization mouth is provided with the ball valve and cam lock rapid-acting coupling that can connect fast in sterilizing process.