Bag-in and bag-out filter

Abstract

The invention discloses a bag-in and bag-out filter, and relates to the technical field of ventilation safety protection equipment. Comprising a shell provided with an air inlet and an air outlet in the width direction, a filter installed in the shell and located between the air inlet and the air outlet, and an aerosol diffusion device installed between the air inlet and an inlet of the filter and used for injecting aerosol into the shell. The downstream gas sampling device and the bacterial slice placing device are arranged between the outlet of the filter and the air outlet, and the downstream gas sampling device is used for collecting gas filtered by the filter; the opening end of the single-head sealing pipe is inserted into the connecting hole of the shell, the single-head sealing pipe is connected with the connecting hole in a sealed mode, the multi-section mesh pipe is connected with the opening of the single-head sealing pipe, meshes are formed in the pipe wall of the multi-section mesh pipe, the head and the tail of the mesh pipe are detachably connected in sequence, and the fungus slices are placed in the mesh pipe. The bag-in and bag-out filter is more convenient and safer to use and more efficient in air exhaust.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation safety protection equipment, in particular to a bag-in-bag-out filter. Background Art

[0002] The filter can filter out pathogenic microorganisms, dust and other harmful substances. Bag-in-bag-out filters are special high-efficiency ventilation safety protection equipment for high biological risk facilities and are an important part of biosafety facilities. Their function is to filter out highly pathogenic microorganisms transmitted through aerosols in the air, filter and intercept them in the system pipeline, prevent the spillage of pathogenic microorganisms, effectively prevent secondary air pollution, protect the safety of the surrounding environment, and ensure the safety of operators.

[0003] The existing bag-in-bag-out filter does not have a gas diffusion plate at the air inlet, or the design of the diffusion plate is too complicated, and the high-speed airflow column directly enters the filter, resulting in a small ventilation area and low filtration efficiency. The existing bag-in-bag-out filter does not have an aerosol diffusion device, or uses a hard tube to pass the aerosol to the middle of the device, which causes uneven diffusion and poor diffusion effect. The existing filter clamping device mostly adopts a planar four-bar mechanism, and the clamping force has a large requirement for the stroke change, and the more suitable clamping force cannot be changed according to the change of the sealing material. Most of the existing bag-in-bag-out filters use the solution of adding a handle to the filter to solve the problem of pulling out the filter, but due to the heavy weight of the filter, the handle is prone to breakage and the filter cannot be removed; secondly, there is the problem of inaccurate filter positioning. The scanning leak detection device of the existing bag-in-bag-out filter has a relatively complex structure, and two guide shafts and screw drive are used in the positioning device. In the actual operation process, to check whether the equipment is thoroughly disinfected, it is often necessary to place a bacterial sheet inside the equipment to reflect whether the disinfection effect meets the standard. The existing bag-in-bag-out filter does not take into account the problem of bacterial sheet placement, which makes it difficult to start or operate in an irregular manner during on-site operation. In terms of transmission, the screw transmission resistance is relatively large, and there is a lot of room for optimization and improvement. The existing inspection door corners are mostly arc transitions. The disadvantage is that the bolt fixing points cannot be added to the corners of the inspection door, and the clamping force is not advantageous. When the existing bag-in-bag-out filter pressure differential pipeline is sterilized, an additional sterilization channel is generally provided. The channel is separately equipped with a quick plug, and this plug cannot be used with the in-situ disinfection port of the equipment's high-efficiency filter. The existing bag-in-bag-out filter has no pressure relief port, which poses a safety hazard.

[0004] In summary, how to optimize the problems existing in the safety, reliability and use of bag-in-bag-out filters is an issue that technicians in this field urgently need to solve. Summary of the invention

[0005] The object of the present invention is to provide a bag-in-bag-out filter, which is more convenient and safe to use and has more efficient exhaust.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A bag-in-bag-out filter comprises a shell provided with an air inlet and an air outlet in the width direction, a filter installed in the shell and located between the air inlet and the air outlet, an aerosol diffusion device installed between the air inlet and the filter inlet for injecting aerosol into the shell, a downstream gas sampling device and a bacterial sheet placement device installed between the filter outlet and the air outlet, the downstream gas sampling device being used to collect gas filtered by the filter, the bacterial sheet placement device comprising a single-head sealed tube with an open end inserted into a connecting hole of the shell and sealedly connected to the connecting hole, a multi-section mesh tube connected to the open end of the single-head sealed tube and having mesh holes on the tube wall, the head and tail of the mesh tube being detachably connected in sequence, and bacterial sheets being placed in the mesh tube.

[0008] Optionally, a partition perpendicular to the axis of the mesh tube is provided in the mesh tube, a plug is connected to the end of the last mesh tube, the head and tail of the mesh tube are directly connected by an internal thread, and the single-head sealing tube and the connecting hole are connected by a perforated chuck.

[0009] Optionally, the shell is provided with an upstream gas sampling port between the aerosol diffusion device and the filter inlet; and also includes a gas failure detection mechanism for judging that the injected aerosol is unqualified when the aerosol concentration collected from the upstream gas sampling port is less than a set threshold.

[0010] Optionally, the downstream gas sampling device includes a scanning leak detection device located at the front end of the bacteria sheet placement device and a total filtration efficiency detection port located at the rear end of the bacteria sheet placement device; and also includes an installation detection mechanism for judging that the filter is incorrectly installed when the difference between the aerosol concentration collected from the scanning leak detection device and the aerosol concentration collected from the total filtration efficiency detection port is greater than a set value.

[0011] Optionally, the scanning leak detection device includes a scanning tube arranged vertically and having a vertical slot, a driving mechanism for driving the scanning tube to move along the depth direction of the shell, and a glue outlet pipe connected to the scanning tube, wherein the aerosol outlet of the glue outlet pipe is connected to the aerosol concentration detection device outside the shell, and the vertical slot is oriented toward and close to the central window of the filter.

[0012] Optionally, the installation detection mechanism includes:

[0013] A concentration detection unit for dynamically detecting the aerosol concentration corresponding to the real-time position of the scanning tube during its movement;

[0014] A position sensor for detecting the real-time position of the scanning tube;

[0015] A data acquisition unit connected to the aerosol concentration and the position sensor and used to acquire the corresponding relationship between the real-time position and the real-time concentration of the scanning tube;

[0016] A position detection unit is used to find out the aerosol collection position information corresponding to when the aerosol concentration is greater than a set value according to the data collection unit.

[0017] Optionally, the aerosol diffusion device includes an aerosol main injection tube connected to the aerosol injection port on the shell, a multi-section aerosol diversion tube one end of which is connected to the outlet of the aerosol main injection tube, and a terminal injection tube connected to the other end of the aerosol diversion tube, the aerosol diversion tube and the terminal injection tube are on a vertical plane parallel to the air inlet surface of the filter, and the multi-section aerosol diversion tubes are spaced at a set angle.

[0018] Optionally, it also includes a gas diffusion turbulence plate arranged between the air inlet and the aerosol diffusion device, the gas diffusion turbulence plate is parallel to the cross-section perpendicular to the axis of the air inlet, the gas diffusion turbulence plate is evenly distributed with air holes, and there is a gap between the edge of the gas diffusion turbulence plate and the inner wall of the shell, the terminal glue injection tube and the aerosol diversion tube are both provided with air holes, and the area surrounded by the terminal glue injection tube covers the entire air inlet surface of the filter.

[0019] Optionally, an inspection door is installed on the inspection port of the shell, connecting bolts are provided on the panel on the outer periphery of the inspection port, the right-angled side of the inspection door adopts an equilateral chamfered type, and a connecting sleeve is provided on the triangular plane of the inspection door. The connecting sleeve is sleeved on the connecting bolts, and the cylinder of the connecting sleeve is a conical hole with an increasing inner diameter at the end close to the panel.

[0020] Optionally, a pressure relief device is provided on the housing, and the pressure relief device comprises:

[0021] A pressure sensor for detecting the pressure in the housing;

[0022] A high efficiency filter device connected to the pressure sensor and the pressure relief port of the shell is used to control the pressure relief of the bag-in-bag-out filter when it is detected that the pressure difference between the pressure inside the shell and the external pressure is greater than a set value before opening the inspection door.

[0023] The beneficial effect of the present invention is that an air inlet and an air outlet are provided in the width direction of the shell, and the air inlet and the air outlet are opposite to each other. The filter is installed in the shell and is located between the air inlet and the air outlet. The gas enters from the air inlet and is filtered by the filter and then discharged from the air outlet. The aerosol diffusion device is installed between the air inlet and the filter inlet. During the leak detection test, the aerosol diffusion device evenly disperses the aerosol into the upstream area of ​​the filter. The downstream gas sampling device is installed between the filter outlet and the air outlet. The downstream gas sampling device is used to collect the gas after filtering by the filter to detect the concentration of the aerosol after filtering. The concentration of the aerosol is used to judge whether the filter is tightly attached to the sealing surface of the shell when installed, and whether there is a leakage problem at the connection between the filter and the sealing surface of the shell.

[0024] In order to ensure that the disinfection effect of the bag-in-bag-out filter meets the standard, the bag-in-bag-out filter of the present application is designed with a special bacterial sheet placement device so that the disinfection is directly checked inside the device. This design helps to improve the reliability and safety of disinfection.

[0025] The bacterial sheet placement device includes a single-head sealed tube and a multi-section mesh tube. The single-head sealed tube has a sealed opening at one end and an open opening at the other end. The open end is inserted into the connection hole of the shell and is sealed and connected to the connection hole. The first section of the mesh tube is connected to the open opening of the single-head sealed tube. The mesh tubes are connected end to end in sequence and are detachably connected, so that the bacterial sheets can be easily placed in different positions during the in-situ disinfection of the bag-in-bag-out filter. The tube wall of the mesh tube has mesh holes. Through the design of the mesh tube, the disinfection gas can be evenly distributed, thereby improving the accuracy of the test.

[0026] When placing the bacterial slices, disassemble the mesh tube where the bacterial slices are to be placed; place the bacterial slices in the mesh tube; and directly or indirectly connect the mesh tube to the single-head sealed tube. After the bacterial slices are placed, the disinfecting gas can enter through the mesh holes on the mesh tube wall and contact the bacterial slices, so that the changes in the bacterial slices can be used to evaluate the thoroughness of the disinfection.

[0027] The bag-in-bag-out filter provided by the present invention is provided with a special bacterial sheet placement device, which not only simplifies the placement and replacement process of the bacterial sheets, but also improves the accuracy of the disinfection test and the convenience of operation, making the on-site disinfection test operation more standardized and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] FIG1 is a schematic structural diagram of a bag-in-bag-out filter provided in a specific embodiment of the present invention;

[0030] FIG2 is a top view of FIG1 ;

[0031] Fig. 3 is a left side view of Fig. 1;

[0032] FIG4 is a right side view of FIG1;

[0033] FIG. 5 is a cross-sectional view of FIG. 1

[0034] FIG6 is a schematic diagram of the structure of a diffusion turbulence plate;

[0035] FIG7 is a schematic structural diagram of an aerosol diffusion device;

[0036] FIG8 is a schematic structural diagram of a scanning leak detection device;

[0037] Fig. 9 is an isometric view of the scanning leak detection device;

[0038] Figure 10 is a schematic diagram of the structure of the access door;

[0039] FIG11 is a partial schematic diagram of the corner of the inspection door;

[0040] Fig. 12 is an axonometric view of the access door;

[0041] FIG13 is a schematic diagram of the structure of a bacterial sheet placement device;

[0042] FIG14 is an isometric view of a bacterial sheet placement device;

[0043] FIG15 is a schematic structural diagram of a clamping device;

[0044] Fig. 16 is a cross-sectional view of the clamping device;

[0045] FIG17 is a diagram showing the use state of the clamping device;

[0046] FIG18 is a diagram of the non-compacted state of the compacting device;

[0047] FIG19 is a diagram showing a clamping state of the clamping device;

[0048] FIG20 is a schematic structural diagram of a positioning and pulling device;

[0049] FIG21 is a schematic diagram of pulling out the positioning pull-out device;

[0050] FIG22 is a schematic diagram of the structure of the pull-out rod;

[0051] Fig. 23 is a state diagram of the filter after installation;

[0052] FIG. 24 is a diagram showing the state of the filter after being pulled out.

[0053] Reference numerals:

[0054] 1- zero leakage valve, 2- upstream gas sampling port, 3- disinfection inlet, 4- aerosol injection port, 5- maintenance door, 6- mechanical differential pressure gauge, 7- differential pressure pipeline, 8- scanning detection port, 9- aerosol outlet, 10- bacterial sheet placement device, 11- disinfection outlet, 12- total filtration efficiency detection port, 13- high efficiency filter device, 14- bracket, 15- electronic differential pressure gauge, 16- gas diffusion turbulent plate, 17- aerosol diffusion device, 18- clamping device, 19- positioning pull-out device, 20- scanning leak detection device, 21- filter, 22- sealing surface, 23- panel, 51- maintenance door body, 52- fixed foot assembly welding, 521- triangular plane, 522- U-shaped reinforcement rib, 523- conical hole, 71- card set ball valve one, 72- card set ball valve two, 73- card set ball valve three, 101- single head sealing tube, 102- partition, 1 03-mesh tube, 104-perforated chuck, 105-inner thread, 106-plug, 161-stamped mesh plate, 162-support bar, 171-horizontal single-sided straight tube with holes, 172-quick-release chuck joint, 173-five-way joint, 174-three-way joint, 175-longitudinal single-sided straight tube with holes, 181-U-shaped pressure plate, 182-positioning sleeve, 183-preload spring, 184-rotating shaft, 185-fixed Position piece, 186-tightening nut, 187-bolt, 188-elliptical cam mechanism, 189-reinforcement plate, 1810-fixing seat, 1811-fixing nut, 191-support seat, 192-pull-out rod, 201-rectangular frame, 202-scanning tube, 203-plastic air duct, 204-fixing block, 205-ball screw pair, 206-handwheel, 207-tank chain, 208-skeleton oil seal sealing seat. DETAILED DESCRIPTION

[0055] The core of the present invention is to provide a bag-in-bag-out filter, which is more convenient and safe to use and has more efficient exhaust.

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] Please refer to Figures 1 to 24, which are schematic diagrams of a bag-in-bag-out filter provided in a specific embodiment of the present invention.

[0058] In a specific embodiment, the bag-in-bag-out filter provided by the present invention includes a shell provided with an air inlet and an air outlet in the width direction, a filter 21 installed in the shell and located between the air inlet and the air outlet, an aerosol diffusion device 17 installed between the air inlet and the inlet of the filter 21 for injecting aerosol into the shell, a downstream gas sampling device and a bacterial sheet placement device 10 installed between the outlet of the filter 21 and the air outlet, the downstream gas sampling device is used to collect gas after being filtered by the filter 21, and the bacterial sheet placement device 10 includes a single-head sealed tube 101 whose open end is inserted into the connecting hole of the shell and is sealed with the connecting hole, and a multi-section mesh tube 103 connected to the open end of the single-head sealed tube 101 and having mesh holes on the tube wall, the head and tail of the mesh tube 103 are detachably connected in sequence, and the bacterial sheets are placed in the mesh tube 103.

[0059] In the above structure, the bag-in-bag-out filter is an efficient and safe gas filtration system, including a shell, a filter 21, an aerosol diffusion device 17, a downstream gas sampling device and a bacterial sheet placement device 10. The shell is installed on a bracket 14. The shell can adopt an integrated continuous welding process and a microporous bubble-free design. The weld of the integrated continuous welding process is continuous and not disconnected, and can also effectively reduce the generation of bubbles, thereby improving the welding quality. It not only improves the strength and sealing of the shell, but also reduces the risk of equipment leakage, ensuring the long-term stable operation of the equipment.

[0060] The shell is provided with an air inlet and an air outlet in the width direction, and the air inlet and the air outlet are opposite to each other. A zero leakage valve 1 can be provided at the air inlet and the air outlet to isolate the bag-in-bag-out equipment independently when the machine is shut down for in-situ disinfection or when the filter 21 is replaced to avoid leakage and protect the safety of operators and the environment. The filter 21 is installed in the shell and is located between the air inlet and the air outlet. After the gas enters from the air inlet, it is filtered by the filter 21 and then discharged from the air outlet.

[0061] The aerosol diffusion device 17 is installed between the air inlet and the inlet of the filter 21 to evenly disperse the aerosol into the upstream area of ​​the filter 21 during the leak test.

[0062] The downstream gas sampling device is installed between the outlet of the filter 21 and the air outlet. The downstream gas sampling device is used to collect the gas after being filtered by the filter 21 to detect the concentration of the aerosol after filtration, and to judge whether the filter 21 is installed accurately based on the aerosol concentration, that is, to judge whether the filter 21 is tightly attached to the shell sealing surface 22 when installed, and whether there is a leakage problem at the connection between the filter 21 and the shell sealing surface 22 based on the aerosol concentration.

[0063] In actual operation, in order to check whether the equipment is thoroughly disinfected, it is often necessary to place bacterial slices inside the equipment to reflect whether the disinfection effect is up to standard. For this purpose, a special bacterial slice placement device 10 is provided in the bag-in-bag-out filter of the present application.

[0064] The bacterial sheet placement device 10 comprises a single-end sealed tube 101 and a multi-section mesh tube 103, wherein one end of the single-end sealed tube 101 is a sealed port and the other end is an open port, wherein the open port is inserted into the connection hole of the housing and is sealed and connected with the connection hole. The first section of the mesh tube 103 is connected to the open port of the single-end sealed tube 101, and the mesh tubes 103 are connected end to end in sequence and are detachably connected, so that the bacterial sheets can be easily placed in different positions during the in-situ disinfection of the bag-in-bag-out filter. The tube wall of the mesh tube 103 has mesh holes, and the design of the mesh tube 103 allows the disinfection gas to be evenly distributed, thereby improving the accuracy of the test.

[0065] Method for placing bacterial slices: disassemble the mesh tube 103 where the bacterial slices are to be placed; place the bacterial slices in the mesh tube 103; directly or indirectly connect the mesh tube 103 to the single-end sealed tube 101. After the bacterial slices are placed, the disinfectant gas can enter through the mesh holes on the wall of the mesh tube 103 and contact the bacterial slices, so that the changes in the bacterial slices can be used to evaluate the thoroughness of disinfection.

[0066] The bag-in-bag-out filter provided by the present invention is provided with a special bacterial sheet placement device 10, which not only simplifies the placement and replacement process of bacterial sheets, but also improves the accuracy of disinfection testing and the convenience of operation, making on-site disinfection testing operations more standardized and effective.

[0067] Based on the above-mentioned specific embodiments, a partition 102 perpendicular to the axis of the mesh tube 103 is provided inside the mesh tube 103, a plug 106 is connected to the end of the last section of the mesh tube 103, the head and tail of the mesh tube 103 are directly connected by an internal thread 105, and the single-head sealing tube 101 and the connecting hole are connected by a perforated chuck 104.

[0068] In a specific embodiment, the partition 102 separates the mesh tube 103 into different areas, and each bacterial sheet is placed in a separate area. The partition 102 has a limiting effect on the bacterial sheets, preventing the bacterial sheets from moving and shifting in the mesh tube 103, thereby reducing mutual interference between the bacterial sheets.

[0069] The end of the last mesh tube 103 is connected with a plug 106, and the plug 106 blocks the end opening of the last mesh tube 103 to prevent the bacterial sheet from slipping out of the end opening.

[0070] The head and tail of the mesh tube 103 have external threads, the internal thread 105 has internal threads, and the mesh tube 103 and the internal thread 105 are connected by threads. The connection method is simple and reliable, and the disassembly is convenient, and it is easy to install and maintain.

[0071] The single-head sealing tube 101 and the connecting hole are connected via a perforated chuck 104. This connection method can ensure the sealing of the connection and prevent gas or liquid leakage.

[0072] On the basis of the above-mentioned specific embodiments, the shell is provided with an upstream gas sampling port 2 between the aerosol diffusion device 17 and the inlet of the filter 21; it also includes a gas failure detection mechanism for judging that the injected aerosol is unqualified when the aerosol concentration collected from the upstream gas sampling port 2 is less than a set threshold.

[0073] In practical applications, ensuring that the filter 21 fits tightly with the housing sealing surface 22 to avoid leakage is the key to ensuring the safety and effectiveness of the equipment. To this end, it is necessary to inject aerosol before the filter 21 and detect the concentration change of the aerosol before and after the filter 21. The injection and detection of aerosol are crucial to determine whether the filter 21 is installed accurately and whether there is leakage. In order to ensure that the injected aerosol is qualified and effective, this application specially sets up a gas failure detection mechanism to ensure the quality and effectiveness of the aerosol.

[0074] An upstream gas sampling port 2 is provided between the filter 21 inlet and the aerosol diffusion device 17 for collecting aerosol samples in the area. The function of this sampling port is to monitor the state and concentration of the aerosol before entering the filter 21.

[0075] Since the aerosol with too low concentration does not change much before and after the filter 21, it is impossible to determine whether it is caused by the incorrect installation of the filter 21 or the small change in the low concentration itself. For this reason, it is necessary to first eliminate the influence of the small change in the low concentration itself. When the aerosol concentration collected from the upstream gas sampling port 2 is less than the set threshold, for example, the aerosol concentration is less than 10μm / L, it indicates that the aerosol injected into the device has no concentration or the concentration is too low. The gas failure detection mechanism will judge that the injected aerosol is unqualified and remind you to re-input qualified aerosol.

[0076] Based on the above embodiment, the aerosol concentration collected by the upstream gas sampling port 2 is detected to determine whether the injected aerosol is qualified, thereby ensuring that the filter 21 fits tightly with the sealing surface 22, thereby ensuring the safety and effectiveness of the installation of the filter 21.

[0077] Based on the above-mentioned specific embodiments, the downstream gas sampling device includes a scanning leak detection device 20 located at the front end of the bacterial sheet placement device 10 and a total filtration efficiency detection port 12 located at the rear end of the bacterial sheet placement device 10; and also includes an installation detection mechanism for judging that the filter 21 is incorrectly installed when the difference between the aerosol concentration collected from the scanning leak detection device 20 and the aerosol concentration collected from the total filtration efficiency detection port 12 is greater than a set value.

[0078] In practical applications, the downstream gas sampling device can ensure the correct installation and efficient operation of the filter 21 through two different detection methods: the scanning leak detection device 20 and the total filtration efficiency detection port 12. These two detection methods complement each other and jointly ensure the sealing and filtration efficiency of the filter 21.

[0079] The scanning leak detection device 20 is located between the filter 21 and the bacterial sheet placement device 10, and is used to ensure the tightness and correct installation of the filter 21. The device manually or automatically detects the aerosol concentration, scans back and forth between the shell back plate and the panel 23, checks the connection between the filter 21 and the sealing surface 22 one by one, monitors aerosol leakage, and helps the operator locate the leakage point and make necessary position or angle corrections. The ultimate goal is to ensure that the filter 21 fits tightly with the sealing surface 22, ensure the tightness and correctness of the filter 21, so as to improve the filtration efficiency and ensure the safety of the system.

[0080] The core of the design of the total filtration efficiency detection port 12 is to comprehensively evaluate the overall filtration efficiency and installation quality of the filter 21 by directly measuring the aerosol concentration at the outlet of the filter 21. The detection port is located between the bacterial sheet placement device 10 and the air outlet. Through the connection with the ventilation pipe, the gas sample at the center position is derived to determine whether the installation of the filter 21 and the sealing surface 22 is correct and ensure a close fit between the two. Such a design increases the safety and reliability of the equipment. Through the data feedback from the detection port, the installation status of the filter 21 can be evaluated and adjusted in time to ensure the correct installation and sealing of the filter 21 to maintain the efficient operation of the system.

[0081] By collecting aerosols simultaneously in two independent and complementary ways, namely, the scanning leak detection device 20 and the total filtration efficiency detection port 12, the installation condition of the filter 21 can be double judged. The test results are cross-checked to ensure the correctness of the test results. This method can provide a more comprehensive performance evaluation of the filter 21, ensuring that the filter 21 can maintain efficient and safe operation under various operating conditions.

[0082] Exemplarily, the installation quality and filtration efficiency of the filter 21 are verified by comparing the aerosol concentrations collected at two different locations. Specifically, by comparing the aerosol concentrations collected by the scanning leak detection device 20 and the total filtration efficiency detection port 12, it is possible to evaluate whether the installation of the filter 21 meets the standards. When the difference in aerosol concentrations between the two detection points exceeds the preset threshold, it indicates that the test result is abnormal, which means that there is an installation error in the filter 21. Once an abnormality is detected, the installation detection agency can make judgments and reminders in a timely manner so that appropriate corrective measures can be taken. This mechanism helps to promptly discover and correct problems that may occur during the installation of the filter 21, and prevent potential reductions in filtration efficiency and pollution risks. By ensuring the correct installation and efficient operation of the filter 21, the stable operation and filtration effect of the entire system are guaranteed.

[0083] Based on the above-mentioned specific embodiments, the scanning leak detection device 20 includes a scanning tube 202 arranged vertically and having a vertical slot, a driving mechanism for driving the scanning tube 202 to move along the depth direction of the shell, and a glue outlet pipe connected to the scanning tube 202. The aerosol outlet 9 of the glue outlet pipe is connected to the aerosol concentration detection device outside the shell, and the vertical slot is oriented toward and close to the center window of the filter 21.

[0084] In practical applications, the scanning tube 202 is used to perform vertical scanning along both ends of the filter 21 to efficiently and accurately detect possible leakage points. The scanning leak detection device 20 includes a scanning tube 202, a driving mechanism and a rubber outlet tube.

[0085] The scanning tube 202 is arranged vertically, passing through the height of the filter 21, and performs a comprehensive scan along the width of the air outlet surface of the filter 21 to detect possible leakage points. A vertical slot is provided on the scanning tube 202, and a blank is left in the middle of the vertical slot, that is, there is no break in the middle of the slot. Such a design plays a supporting role, strengthens the structure of the scanning tube 202, and reduces the possibility of deformation of the scanning tube 202 during operation. The aerosol sample is sucked in from the central window of the filter 21 for concentration detection. Through the vertical slot, the aerosol sample is sucked into the scanning tube 202 for concentration detection. In order to efficiently and accurately collect the aerosol sample escaping from the central window of the filter 21, the slot can be directed toward and close to the central window of the filter 21 to ensure the accuracy of the detection.

[0086] The driving mechanism drives the scanning tube 202 to reciprocate along the width direction of the air outlet surface of the filter 21 to ensure the continuity of the scanning process, so that the scanning tube 202 can cover the entire air outlet surface of the filter 21, and ensure that the sealing of the filter 21 is detected without omission. The driving mechanism can be a ball screw pair 205, and the ball screw pair 205 is connected to the scanning detection port 8 of the shell through the skeleton oil seal seal seat 208. One end of the ball screw pair 205 passes through the scanning detection port 8 of the shell and is connected to the hand wheel 206 or the driving motor to control the rotation of the ball screw pair 205. The scanning tube 202 is connected to the ball screw pair 205 through the fixed block 204 to realize the reciprocating movement of the scanning tube 202.

[0087] As a part of the scanning leak detection device 20, the rubber outlet pipe is responsible for exporting the aerosol sample from the filter 21 and connecting to the aerosol concentration detection device outside the shell to facilitate real-time monitoring of the concentration change of the aerosol. The rubber outlet pipe can be a plastic air duct 203, which usually has good chemical stability and corrosion resistance and is suitable for a variety of environmental conditions. The tank chain 207 connected thereto provides a flexible connection method, which is convenient for arranging pipelines in a space-constrained environment. Another option for the rubber outlet pipe is to use a hose, which usually has good flexibility, is easy to install and adapt to different layout requirements.

[0088] Preferably, the scanning leak detection device 20 includes a guide rail that is stable and convenient for the scanning tube 202 to move. The bottom and top surfaces of the shell are provided with C-shaped grooves, and the two ends of the scanning tube 202 are respectively connected to the C-shaped grooves on the bottom and top surfaces. This design allows the scanning tube 202 to slide along the C-shaped groove to achieve a flexible movement path. The C-shaped groove provides a guide rail sliding structure that can reduce the friction of the scanning tube 202 during movement and ensure smooth sliding.

[0089] A rectangular frame 201 is provided in the shell, and the edge of the frame also has a C-shaped groove. The two ends of the scanning tube 202 are respectively connected to the bottom and top surfaces of the rectangular frame 201. This structural design can provide better stability and load-bearing capacity. The addition of the rectangular frame 201 provides an additional support structure, which can reduce the vibration or deviation of the scanning tube 202 during movement.

[0090] Based on the above embodiments, the scanning leak detection device 20 takes into account the comprehensiveness of scanning, the collection efficiency of aerosol samples and the compatibility with the aerosol concentration detection device to ensure that the sealing and performance of the filter 21 are effectively monitored and evaluated.

[0091] Based on the above specific embodiments, the installation detection mechanism includes:

[0092] A concentration detection unit for dynamically detecting the aerosol concentration corresponding to the real-time position of the scanning tube 202 during its movement;

[0093] A position sensor for detecting the real-time position of the scanning tube 202;

[0094] A data acquisition unit connected to the aerosol concentration and position sensor for acquiring the corresponding relationship between the real-time position and the real-time concentration of the scanning tube 202;

[0095] A position detection unit is used to find out the aerosol collection position information corresponding to when the aerosol concentration is greater than a set value according to the data collection unit.

[0096] In practical applications, the concentration detection unit is responsible for dynamically detecting the aerosol concentration corresponding to the real-time position during the movement of the scanning tube 202. Specifically, it can be achieved through an aerosol concentration measuring instrument, which can analyze the size of aerosol particles and measure the concentration, and is suitable for sensors with different measuring ranges. The position sensor is used to detect the real-time position of the scanning tube 202. The sensor can be contact or proximity type, and can also be divided into linear position sensors, etc. The data acquisition unit is connected to the aerosol concentration and position sensor, and is responsible for collecting the corresponding relationship between the real-time position and real-time concentration of the scanning tube 202, converting the signal in the real world into a digital signal, and storing the corresponding relationship data. The position detection unit finds the aerosol collection position information corresponding to the aerosol concentration greater than the set value based on the data provided by the data acquisition unit. The collected data is analyzed to determine the specific position where the aerosol concentration exceeds the standard, thereby determining the exact position where the filter 21 is installed incorrectly.

[0097] Based on the above embodiments, the entire installation and detection mechanism can realize real-time monitoring and detection of the installation status of the filter 21 through the coordinated work of these units, and can promptly discover the exact location where problems may occur in the installation process of the filter 21, and make targeted adjustments to ensure the correct installation and effective operation of the filter 21.

[0098] On the basis of the above-mentioned specific embodiments, the aerosol diffusion device 17 includes an aerosol main injection tube connected to the aerosol injection port 4 on the shell, a multi-section aerosol diversion tube one end of which is connected to the outlet of the aerosol main injection tube, and a terminal injection tube connected to the other end of the aerosol diversion tube. The aerosol diversion tube and the terminal injection tube are on a vertical plane parallel to the air inlet surface of the filter 21. The multi-section aerosol diversion tubes are spaced at a set angle, and air holes are provided on the terminal injection tube and the aerosol diversion tube.

[0099] In practical applications, the main aerosol injection pipe is connected to the aerosol injection port 4 on the shell, and is the main channel for aerosol to enter the system. One end of the multi-section aerosol diversion pipe is connected to the outlet of the main aerosol injection pipe, and is used to divert the aerosol in the main injection pipe to different terminal injection pipes. The terminal injection pipe is connected to the other end of the aerosol diversion pipe, and is responsible for finally transporting the aerosol to the designated location.

[0100] The multiple sections of the aerosol diversion tubes are spaced at set angles, and the aerosol diversion tubes and the terminal injection tubes are arranged on a vertical plane, which is parallel to the air inlet surface of the filter 21. The area surrounded by the terminal injection tubes covers the entire air inlet surface of the filter 21. This layout helps to evenly distribute the aerosol on the entire air inlet surface of the filter 21, avoids excessively high or low local concentrations, and improves the filtering effect and the diffusion efficiency of the aerosol.

[0101] Exemplarily, the main aerosol injection tube is connected to the shell through a quick-release chuck joint 172, the number of aerosol diversion tubes is four, the main aerosol injection tube is connected to the four aerosol diversion tubes through a five-way joint 173, and the main aerosol injection tubes are distributed 90° apart, two of which are in the vertical direction and two in the horizontal direction. The terminal injection tube is connected to the aerosol diversion tube through a three-way joint 174, and the terminal injection tube includes a horizontal single-sided straight tube with holes 171 and a longitudinal single-sided straight tube with holes 175. The horizontal single-sided straight tube with holes 171 and the longitudinal single-sided straight tube with holes 175 cover the entire air inlet surface of the filter 21, which can ensure that the aerosol is evenly distributed on the air inlet surface of the filter 21.

[0102] In a preferred embodiment, the aerosol diffusion device 17 further includes an aerosol uniformity detection mechanism for detecting whether the aerosol concentration deviation at each point on the air inlet surface of the filter 21 is less than a set value, and the aerosol uniformity detection mechanism includes:

[0103] a concentration detection unit for detecting aerosol concentrations at multiple measuring points in the upstream region of the filter 21;

[0104] The distribution detection unit is connected to the concentration detection unit and is used to determine that the aerosol distribution is qualified when the deviation between the aerosol concentration test result of the measuring point and the arithmetic mean value of the test results of each measuring point is less than the set value.

[0105] Specifically, in the upstream area of ​​the filter 21, 9 measuring points with a rectangular central square hole in three rows and three columns are selected, and the deviations between the aerosol concentration test results of the 9 measuring points and the arithmetic mean values ​​of the test results of each measuring point are all less than 20%, indicating that the aerosol distribution is qualified.

[0106] Through this design, the aerosol diffusion device 17 can achieve uniform distribution and effective diffusion of the aerosol, and provide a stable aerosol source for the filter 21, so as to facilitate the detection of aerosol concentration and the performance evaluation of the filter 21.

[0107] On the basis of the above-mentioned specific embodiments, it also includes a gas diffusion turbulence plate 16 arranged between the air inlet and the aerosol diffusion device 17, the gas diffusion turbulence plate 16 is parallel to the cross section perpendicular to the axis of the air inlet, and air holes are evenly distributed on the gas diffusion turbulence plate 16. There is a gap between the edge of the gas diffusion turbulence plate 16 and the inner wall of the shell.

[0108] In practical applications, the gas diffusion turbulent plate 16 can improve the gas flow characteristics. The gas diffusion turbulent plate 16 promotes the uniform distribution of gas through the air holes evenly distributed thereon, which helps to reduce turbulence and eddy currents in the gas flow process, thereby improving the uniformity of gas flow. The gas diffusion turbulent plate 16 is parallel to the cross section perpendicular to the axis of the air inlet, which helps the gas to form a uniform flow field before entering the aerosol diffusion device 17, reducing the non-uniformity of gas flow. There is a gap between the edge of the gas diffusion turbulent plate 16 and the inner wall of the shell, which can prevent the gas from forming a dead angle at the edge of the shell, ensuring the continuity and uniformity of the gas flow.

[0109] By providing the gas diffusion turbulence plate 16 , the high-speed airflow from the air inlet can be evenly spread onto the filter 21 with a larger ventilation area, which helps to improve the filtering efficiency of the filter 21 .

[0110] Exemplarily, a rectangular stamped mesh plate 161 is selected as the high-speed impact gas diffusion turbulence plate 16. The bottom of the stamped mesh plate 161 is connected to the bottom surface of the shell through a support bar 162. It has a simple structure and low manufacturing cost, but significant effect. According to airflow simulation and actual measurement, it is found that when the high-speed columnar airflow impacts the punched mesh plate, part of it will be blocked from diverging outward, and part of it will pass through the dense circular holes in the middle, which can just spread out the columnar airflow and form a gas turbulent state, thereby better mixing the high-speed gas.

[0111] On the basis of the above-mentioned specific embodiments, an inspection door 5 is installed on the inspection port of the shell, and connecting bolts are provided on the panel 23 on the outer periphery of the inspection port. The right-angled sides of the inspection door 5 are equilaterally chamfered, and a connecting sleeve is provided on the triangular plane 521 of the inspection door 5. The connecting sleeve is sleeved on the connecting bolt, and the cylinder of the connecting sleeve is a conical hole 523 with an increasing inner diameter at the end close to the panel 23.

[0112] In a specific embodiment, an inspection port is provided on the housing, and an inspection door 5 is installed on the inspection port to ensure the sealing and integrity of the housing during non-maintenance periods. Connecting bolts are provided on the panel 23 around the inspection port to connect the inspection door 5 and the panel 23 to ensure the sealing of the inspection door 5 in normal working state and the convenient opening in the maintenance state.

[0113] The right angle side of the inspection door 5 is of equilateral chamfered type. The inspection door 5 includes an inspection door body 51. The four right angle sides of the inspection door body 51 are connected to the fixed foot assembly weld 52. The fixed foot assembly weld 52 includes a triangular plane 521, a U-shaped reinforcement rib 522 and a conical hole 523. A connecting sleeve is provided on the triangular plane 521. The connecting sleeve is mounted on the connecting bolt, and then a fastening nut is connected to the end of the connecting bolt. This design can reduce stress concentration, reduce structural weaknesses caused by local sharp angles, and make the door structure more solid.

[0114] A circle of U-shaped sealing ring is connected to the outer periphery of the inspection door 5 to ensure the sealing between the inspection door 5 and the shell. The cylinder of the connecting sleeve is a conical hole 523 with a gradually increasing inner diameter at the end close to the panel 23. The conical hole 523 has a guiding function so that it can be smoothly mounted on the connecting bolt. In order to strengthen the strength of the triangular plane 521, a U-shaped reinforcing rib 522 is provided on the triangular plane 521. The U-shaped reinforcing rib 522 is provided on the outer periphery of the conical hole 523, which not only facilitates the connection between the inspection door 5 and the shell, but also strengthens the connection point between the inspection door 5 and the shell, making it more rigid. Even the plum nut with the strongest tightening force cannot deform the door panel.

[0115] On the basis of the above-mentioned specific embodiments, a pressure relief device is provided on the housing, and the pressure relief device includes:

[0116] A pressure sensor for detecting the pressure inside the housing;

[0117] A high efficiency filter device 13 connected to the pressure sensor and the pressure relief port of the shell is used to control the pressure relief of the bag-in-bag-out filter when it is detected that the pressure difference between the pressure inside the shell and the external pressure is greater than a set value before the inspection door 5 is opened.

[0118] In actual application, during in-situ disinfection, the electric zero leakage valves 1 before and after the bag-in-bag-out filter are closed at the same time. At this time, due to the pressure loss of the filter 21, there is a pressure difference of about 500Pa between the cavity of the bag-in-bag-out filter and the outside world. For the sake of operational safety, pressure relief is required. In addition, in order to prevent the leakage of harmful microorganisms in the bag-in-bag-out filter, the high-efficiency filter device 13 in the pressure relief port can filter the harmful microorganisms to prevent them from leaking out.

[0119] For example, a device that uses a pressure sensor to detect the pressure inside the housing can monitor the pressure changes of the system in real time. The high-efficiency filter device 13 is connected to the pressure sensor and connected to the pressure relief port of the housing. The function of this device is that before opening the inspection door 5, the control system will determine whether pressure relief is required based on the signal of the pressure sensor. When it is detected that the pressure difference between the pressure inside the housing and the external pressure is greater than the set value, the control system will send a signal to open the valve to release the pressure, maintain the pressure of the system within a safe range, and avoid equipment damage or accidents.

[0120] In a preferred embodiment, the bag-in-bag-out filter provided by the present invention and the design of the pressure differential pipeline 7 fully consider the requirements for pipeline sterilization, and select pipeline connectors with low ventilation resistance (such as using a ferrule ball valve instead of a needle stop valve) and pipeline filters with large filtration areas. When the main filter is sterilized, the pressure differential pipeline 7 and the filter can be sterilized at the same time. The dedicated sterilization channel for the pressure differential pipeline 7 is eliminated, thereby improving the disinfection efficiency.

[0121] The mechanical differential pressure gauge 6 and the electronic differential pressure gauge 15 are connected in parallel at both ends of the differential pressure pipeline 7. The differential pressure of the differential pressure pipeline 7 can be detected by the mechanical differential pressure gauge 6 or / and the electronic differential pressure gauge 15. The mechanical differential pressure gauge 6 and the electronic differential pressure gauge 15 can be detected separately or simultaneously. The electronic differential pressure gauge 15 also has an early warning reminder function. For example, when the instantaneous differential pressure is detected to be large, an alarm reminder is issued.

[0122] The in-situ disinfection method includes: the first step is to close the zero leakage valve 1 at both ends of the equipment; the second step is to connect the disinfection pipeline, and the disinfection pipeline is connected to the disinfection inlet 3 and the disinfection outlet 11; the third step is to open the pressure relief valve of the pressure relief port, hold it for one second and then close the pressure relief valve; the fourth step is to close the ferrule ball valve 2 72 and the ferrule ball valve 3 73, and open the ferrule ball valve 1 71; the fifth step is to close the ferrule ball valve 1 71 after the disinfection is completed, and open the ferrule ball valve 2 72 and the ferrule ball valve 3 73.

[0123] In a preferred embodiment, a clamping device 18 for a bag-in-bag-out filter is arranged parallel to the opposite side of the sealing surface 22 of the shell, and includes a U-shaped pressure plate 181 having a pair of long legs and short legs, and a rotating shaft 184 arranged between the long legs and the short legs along the length direction of the U-shaped pressure plate 181. The first end of the rotating shaft 184 extends out of the panel 23 of the shell to connect to a driving mechanism that drives it to rotate. The long legs are farther away from the sealing surface 22 than the short legs, and the long legs and the filter 21 have overlapping projections on the projection of the sealing surface 22; it also includes a cam mechanism connected to the rotating shaft 184 for driving the U-shaped pressure plate 181 to move to the side away from the sealing surface 22, and a clamping mechanism connected to the U-shaped pressure plate 181 for causing the long legs to press the filter 21.

[0124] In the above structure, the pressing device 18 of the bag-in-bag-out filter is arranged parallel to the opposite side of the housing sealing surface 22, and is used to make the filter 21 fit closely with the housing sealing surface 22, thereby ensuring the sealing between the filter 21 and the housing sealing surface 22. The pressing device 18 includes a U-shaped pressing plate 181, a rotating shaft 184, a driving mechanism, a cam mechanism and a pressing mechanism.

[0125] The U-shaped pressing plate 181 is composed of a pair of long foot plates and short foot plates, wherein the short foot plates are close to the sealing surface 22, while the long foot plates are relatively far away from the sealing surface 22. Such a design makes the opening of the U-shaped pressing plate 181 face the side close to the sealing surface 22, and the opening direction of the U-shaped pressing plate 181 is corresponding to the position of the clamping device 18, whether it is located at the bottom or the top, that is, the opening is upward at the bottom and downward at the top.

[0126] The projection of the long foot plate and the filter 21 on the sealing surface 22 can form an overlapping projection, which means that the long foot plate can evenly press the filter 21, thereby achieving effective sealing. By ensuring good contact between the long foot plate and the sealing surface 22, gas leakage caused by uneven pressure or poor sealing can be avoided, which is crucial to maintaining environmental safety and improving filtration efficiency.

[0127] The rotating shaft 184 is arranged along the length direction of the U-shaped pressing plate 181, between the long foot plate and the short foot plate, and more preferably at the center of the two. This layout can ensure uniform distribution of force, thereby providing balanced force when pressing the filter 21. The first end of the rotating shaft 184 extends out of the panel 23 of the housing so as to be connected to an external driving mechanism, such as a motor or a manual handle, to drive it to rotate.

[0128] The rotating shaft 184 rotates flexibly between the long foot plate and the short foot plate of the U-shaped pressure plate 181, which is achieved by the cooperation of the rotating shaft 184 with the connecting hole on the reinforcing plate 189 and the limiting hole on the panel 23. This design allows the rotating shaft 184 to provide necessary adjustment functions while transmitting power.

[0129] The cam mechanism is connected to the rotating shaft 184 through a square shaft. The square hole of the cam mechanism is connected to the square shaft on the rotating shaft 184, and the cam mechanism rotates with the rotating shaft 184, while preventing the cam mechanism from rotating circumferentially relative to the rotating shaft 184, thereby realizing the circumferential positioning of the cam mechanism relative to the rotating shaft 184, and ensuring that the relative positions of the two are fixed. In order to further ensure the stability of the cam mechanism, a socket is provided on the rotating shaft 184 and the cam mechanism, and a pin is connected to the socket to realize the axial positioning of the cam mechanism relative to the rotating shaft 184, and prevent the cam mechanism from moving in the axial direction. Through axial and circumferential positioning, the cam mechanism is firmly fixed on the rotating shaft 184, preventing any movement or rotation relative to the rotating shaft 184, and ensuring the stability and reliability of the mechanism.

[0130] The present application utilizes the rotation of the cam mechanism to control the opening and closing action of the U-shaped pressure plate 181, thereby achieving the compression and release of the filter 21. Specifically, the cam mechanism has a short side and a long side, and the two parts are smoothly connected, so that the radius of the cam changes during the rotation process. This design allows the cam mechanism to have different contact points with the long foot plate of the U-shaped pressure plate 181 when rotating, thereby achieving different motion trajectories.

[0131] The rotation radius of the short side is smaller than the distance between the rotating shaft 184 and the long foot plate, which means that when this part of the cam rotates, it will not contact the long foot plate. On the contrary, the rotation radius of the long side is larger than the distance between the rotating shaft 184 and the long foot plate, so that the long side can contact the long foot plate when it rotates to a specific position. When the cam rotates to the position where the long side abuts against the long foot plate, it drives the U-shaped pressure plate 181 to move to the side away from the sealing surface 22. This action causes the long foot plate to separate from the filter 21, thereby disengaging the clamping device 18 from the filter 21 and allowing the filter 21 to move out freely.

[0132] The present application utilizes a clamping mechanism to ensure that the long foot plate of the U-shaped pressure plate 181 can accurately and reliably clamp the filter 21 toward the side of the sealing surface 22, so as to achieve the sealing between the filter 21 and the housing. Specifically, the clamping mechanism is connected to the U-shaped pressure plate 181, and when the long side of the cam mechanism is not in contact with the long foot plate, for example, when the long side is parallel to the long foot plate, the clamping mechanism drives the long foot plate to clamp toward the side of the sealing surface 22 until the long foot plate clamps the filter 21, ensuring that the filter 21 is tightly fitted with the sealing surface 22.

[0133] The clamping device 18 for the bag-in-bag-out filter provided by the present invention provides a reliable, accurate and easy-to-operate clamping mechanism to ensure the sealing between the filter 21 and the housing, prevent leakage, make the clamping and release of the filter 21 simple and quick, and improve the efficiency of maintaining and replacing the filter 21. The rotation of the rotating shaft 184 drives the rotation of the cam mechanism, and the change of the rotation radius of the cam mechanism is used to control the position of the U-shaped pressing plate 181, so as to realize the opening and closing action of the U-shaped pressing plate 181, and realize the clamping and release of the filter 21. This mechanism ensures that the clamping device 18 can accurately control the clamping and release of the filter 21, and improves the efficiency and reliability of the operation. Accurate clamping force can be achieved through the clamping mechanism. This precise control helps to prevent excessive or insufficient clamping of the filter 21, and ensures the sealing and safety of the filter 21.

[0134] On the basis of the above-mentioned specific embodiments, a large through hole is provided on the long foot plate, and a small through hole is provided on the short foot plate. The axes of the large through hole and the small through hole coincide to form a through hole of the U-shaped pressure plate 181. The clamping mechanism includes a bolt 187 mounted in the through hole and a preload spring 183 mounted on the bolt 187. One end of the bolt 187 is connected to the fixed seat 1810 of the shell, and the other end is provided with a positioning piece 185 on the outer side of the long foot plate. The diameters of the preload spring 183 and the positioning piece 185 are between the large through hole and the small through hole. One end of the preload spring 183 abuts on the short foot plate, and the other end passes through the large through hole and abuts on the positioning piece 185.

[0135] In a specific embodiment, the clamping mechanism is a carefully designed mechanical structure for ensuring the sealing between the filter 21 and the housing. The clamping mechanism can be spring loaded to prevent over-clamping. This design can provide appropriate preload force while avoiding excessive pressure on the filter 21, thereby protecting the filter 21 from damage. The clamping mechanism can also be limited by a ratchet mechanism to further improve the safety of the filter 21. The ratchet mechanism can ensure that the clamping device 18 will not be accidentally released during the clamping process, thereby enhancing the reliability of the entire system.

[0136] Exemplarily, the clamping mechanism includes a bolt 187 and a pre-stressed spring 183. A large through hole is provided on the long foot plate of the U-shaped pressure plate 181, and a small through hole is provided on the short foot plate, and the diameter of the large through hole is larger than the diameter of the small through hole. The axes of the two through holes coincide, forming a through hole of the U-shaped pressure plate 181, that is, forming a continuous channel for passing the bolt 187 of the clamping mechanism. The bolt 187 is sleeved on the through hole, and one end is connected to the fixed seat 1810 of the shell, and can be specifically fastened to the fixed seat 1810 by a fixing nut 1811, and the fixing nut 1811 is welded to the box fixed seat 1810. The other end of the bolt 187 is provided with a positioning piece 185 on the outside of the long foot plate, and the positioning piece 185 can be positioned by a clamping nut 186. The pre-compression spring 183 is sleeved on the bolt 187, and the bolt 187 is the guide rod of the pre-compression spring 183. When the U-shaped pressure plate 181 moves freely along the bolt 187, the pre-compression spring 183 moves along the bolt 187. The diameter of the pre-compression spring 183 is between the large through hole and the small through hole, one end of which abuts on the short foot plate, and the other end passes through the large through hole and abuts on the positioning piece 185. The positioning piece 185 is used to limit the movement of the pre-compression spring 183, and the large through hole can pass through the positioning piece 185. The pre-compression spring 183 provides a pre-tightening force between the positioning piece 185 and the short foot plate.

[0137] The preload spring 183 is in a compressed state in the initial state, providing the required preload force for the U-shaped pressure plate 181, and this preload force ensures that the U-shaped pressure plate 181 maintains pressure on the filter 21. When the long side of the cam contacts the long foot plate, it drives the U-shaped pressure plate 181 to move along the bolt 187 to the side away from the sealing surface 22, and the compression of the preload spring 183 intensifies. On the contrary, when the U-shaped pressure plate 181 moves to the side close to the sealing surface 22, the preload spring 183 helps to smoothly press the filter 21. When it is necessary to press the filter 21, the driving mechanism rotates the shaft 184, drives the cam mechanism to rotate, pushes the U-shaped pressure plate 181 to move, and makes the long foot plate apply pressure to the filter 21. The function of the preload spring 183 ensures that the filter 21 is quickly replaced while maintaining the sealing between the filter 21 and the housing, preventing the risk of leakage caused by insufficient pressure.

[0138] The clamping force of the clamping mechanism is provided by the elastic force of the compression spring and can be adjusted by adjusting the stroke length of the spring clamping nut 186. In order to ensure the consistency of the clamping force, the stroke lengths of all spring clamping nuts 186 need to be adjusted to be consistent. By ensuring the consistency of the clamping force of all springs, the problem of inconsistent clamping force on both sides is avoided, thereby achieving uniform compression of the filter 21.

[0139] Based on the above embodiment, the clamping device 18 uses the pre-stressing spring 183 to provide a stable pre-stressing force, and accurately controls the movement of the U-shaped pressure plate 181 through the rotation of the cam mechanism to achieve reliable clamping and rapid replacement of the filter 21 while maintaining the sealing and system reliability.

[0140] On the basis of the above-mentioned specific embodiments, the short foot plate is provided with a positioning sleeve 182 facing the long foot plate at the small through hole, and the pre-stress spring 183 is sleeved on the positioning sleeve 182. The positioning sleeve 182 provides a stable installation foundation for the pre-stress spring 183 and has a guiding effect on the pre-stress spring 183, ensuring that the pre-stress spring 183 can be stably and smoothly extended and retracted.

[0141] Based on the above-mentioned specific embodiments, several groups of reinforcing plates 189 are connected between the long foot plates and the short foot plates. The reinforcing plates 189 are perpendicular to the long foot plates. Connecting holes are provided on the reinforcing plates 189. Limiting holes are provided on the panel 23. The rotating shaft 184 is connected to the connecting holes and the limiting holes.

[0142] In a specific embodiment, the reinforcing plate 189 is sandwiched between the long foot plate and the short foot plate to provide a solid support for the U-shaped pressure plate 181, increase the rigidity and strength of the U-shaped pressure plate 181, and prevent deformation or crushing under high pressure or high load.

[0143] The reinforcing plate 189 is provided with a connecting hole for receiving the rotating shaft 184 so that the rotating shaft 184 can pass through the reinforcing plate 189. Preferably, the rotating shaft 184 is normally connected to the connecting hole, and the reinforcing plate 189 provides support for the rotating shaft 184 to ensure the stability of the rotation of the rotating shaft 184.

[0144] A limiting hole is provided on the panel 23, which is aligned with the connecting hole on the reinforcing plate 189 and is used to fix the position of the rotating shaft 184 and limit the movement of the rotating shaft 184, which has only one degree of freedom of rotation, thereby ensuring the precise positioning of the rotating shaft 184, thereby ensuring the reliability and durability of the clamping mechanism.

[0145] In a preferred embodiment, the connecting hole is an elongated hole whose long axis is perpendicular to the long foot plate, and the horizontal position of the connecting hole and the rotating shaft 184 is adjustable to adjust the distance that the long foot plate is separated from the filter 21 .

[0146] In a specific embodiment, the reinforcing plate 189 is perpendicular to the long foot plate, the connecting hole is a long strip hole, the long axis of the long strip hole is perpendicular to the long foot plate, and the rotating shaft 184 can move along the length direction in the long strip hole, so that the horizontal position of the rotating shaft 184 relative to the long foot plate can be adjusted, thereby changing the pressure point where the long side of the cam mechanism contacts the long foot plate, thereby adjusting the distance that the long foot plate is separated from the filter 21, ensuring that the rotating shaft 184 can provide necessary adjustment functions while transmitting power.

[0147] When the filter 21 is pressed, the long foot plate is gradually brought close to the filter 21 by the ability of the pressing mechanism until the required sealing pressure is reached. When the filter 21 needs to be released or replaced, the long foot plate can be gradually separated from the filter 21 by adjusting the position of the rotating shaft 184, so that the filter 21 can be easily removed. By accurately controlling the distance between the long foot plate and the filter 21, the optimal removal clearance of the filter 21 can be ensured to prevent the long foot plate from colliding and rubbing with the filter 21 during the removal process; at the same time, after the cam end is rubbed, fine-tuning can be performed without disassembling the entire pressing device 18 to compensate for the difference in the position change of the cam end due to wear, and ensure the accurate removal distance between the long foot plate and the filter 21; the U-shaped pressing plate 181 can adapt to filters 21 of different sizes, and is flexible and reliable to use.

[0148] Based on the above-mentioned specific embodiments, the cam mechanism is an elliptical cam mechanism 188. When the rotating shaft 184 drives the elliptical cam mechanism 188 to rotate until the long side of the cam mechanism abuts against the long foot plate, the U-shaped pressure plate 181 moves the maximum distance to the side away from the sealing surface 22, and the long side end of the elliptical cam mechanism 188 has a plane in contact with the long foot plate.

[0149] In a specific embodiment, the outer contour of the elliptical cam mechanism 188 is composed of an elliptical line and a tangent circle. This design allows a continuous and smooth change from the minimum outer circle radius to the maximum outer circle radius within a range of 90 degrees of rotation of the rotating shaft 184. This change allows the stroke of the clamping device 18 to be flexibly adjusted to meet different clamping requirements. The elliptical cam mechanism 188 provides a maximum to minimum stroke of the clamping device 18 within a range of 90 degrees, so that the clamping function can be achieved by simply rotating the rotating shaft 184, ensuring that the position control of the U-shaped clamping plate 181 during the clamping and releasing process is accurate.

[0150] The rotating shaft 184 is connected to the cam mechanism. When the rotating shaft 184 rotates, the cam mechanism is driven to rotate. During the rotation of the cam mechanism, its long side gradually abuts against the long foot plate, thereby pushing the U-shaped pressure plate 181 to move. When the long side of the cam mechanism completely abuts against the long foot plate, the U-shaped pressure plate 181 will move to the side away from the sealing surface 22 to the maximum distance. This position is the release position, allowing the filter 21 to be easily inserted or removed. The distance between the U-shaped pressure plate 181 and the filter 21 is large, which improves the convenience of replacing the filter 21.

[0151] The cam mechanism is designed with a flat surface at the end of the long side, and the tip of the oval cam is ground flat to provide a stable contact point. Under the action of spring force, this design can realize a self-locking function, ensuring that when the cam mechanism is rotated into place, it can stably push the long foot plate.

[0152] Based on the above embodiment, the elliptical cam mechanism 188 achieves precise control of the U-shaped pressing plate 181 through its unique design and flexible control method, so as to efficiently press and release the filter 21. This design not only improves the efficiency of replacing the filter 21, but also ensures the sealing and reliability between the filter 21 and the housing.

[0153] Based on the above-mentioned specific embodiments, the second end of the U-shaped pressure plate 181 and the rotating shaft 184 extend to the back plate of the shell, and at least two groups of cam mechanisms and two groups of clamping mechanisms are provided on the rotating shaft 184 to respectively clamp the front and rear of the filter 21.

[0154] In a specific embodiment, the U-shaped pressing plate 181 and the rotating shaft 184 penetrate the front panel 23 and the back panel of the housing, at least one set of cam mechanisms and pressing mechanisms are arranged at the front end of the U-shaped pressing plate 181 and the rotating shaft 184, and one set of cam mechanisms and pressing mechanisms are arranged at the rear end of the U-shaped pressing plate 181 and the rotating shaft 184, respectively pressing the front and rear of the filter 21. Using a set of U-shaped pressing plates 181 and the rotating shaft 184 to simultaneously control multiple sets of cam mechanisms and pressing mechanisms to achieve synchronous pressing and releasing of the front and rear of the filter 21 helps to maintain the sealing between the filter 21 and the housing, prevent air or liquid leakage, and thus improve the reliability of the entire filtering system.

[0155] Based on the above embodiment, linkage is achieved through the cam mechanism and the clamping mechanism on the same group of U-shaped pressure plates 181 and the rotating shaft 184, ensuring that the filter 21 is clamped or released at the same time on the same horizontal plane, which helps to maintain the stability and synchronization of the movement of the filter 21; since multiple clamping points can be controlled at the same time, the time and labor intensity required for replacing the filter 21 are reduced, the filter 21 can be quickly replaced, and the maintenance and operation efficiency are improved; since the front and rear clamping mechanisms work at the same time, the pressure on the filter 21 can be more evenly distributed, reducing the risk of poor sealing or damage to the filter 21 due to uneven pressure; using a group of U-shaped pressure plates 181 and rotating shafts 184 to control multiple groups of cam mechanisms and clamping mechanisms can simplify the structural design and reduce the number of components required, thereby reducing manufacturing costs and maintenance complexity; since the front and rear clamping mechanisms work synchronously, the risk of filter 21 displacement or damage caused by operating each part individually can be reduced, thereby improving the stability of the entire system.

[0156] Based on the above specific embodiments, there are two sets of pressing devices 18 , which respectively press the bottom and the top of the filter 21 .

[0157] In a specific embodiment, there are two sets of clamping devices 18, each set is responsible for clamping different parts of the filter 21, for example, two sets of clamping devices 18 are responsible for the top and bottom of the filter 21 respectively, so that the two parts can be clamped independently. By arranging independent clamping devices 18 at the top and bottom of the filter 21, the sealing performance of the filter 21 and the reliability of the system are improved. At the same time, it also provides the convenience of maintenance and the flexibility of operation, ensuring the stable operation of the filtration system under various working conditions. Accurate sealing pressure control is performed on each part of the filter 21 to adapt to different sealing requirements. By independently controlling the clamping force of the top and bottom, it can more accurately adapt to different sealing requirements and ensure the sealing between the entire filter 21 and the housing. Arranging the clamping devices 18 at the top and bottom of the filter 21 respectively can more evenly distribute the pressure on the filter 21. This uniform pressure distribution helps to reduce the risk of poor sealing or damage to the filter 21 caused by uneven pressure. The two sets of clamping devices 18 provide a certain degree of redundancy, and even if one of them fails, the other can still maintain basic sealing functions. This redundant design improves the reliability of the entire filtration system. If one set of the clamping devices 18 requires maintenance or fails, the other set can maintain the seal of the filter 21, allowing maintenance without affecting the operation of the overall system.

[0158] On the basis of the above-mentioned specific embodiments, the driving mechanism is a motor connected to the first end of the rotating shaft 184, and the motors of the two sets of clamping devices 18 rotate synchronously.

[0159] In practical applications, the two sets of clamping devices 18 can be operated synchronously or independently to meet different working conditions and requirements. For example, the synchronous movement of the two sets of clamping devices 18 can be achieved by a motor connected to the first end of the rotating shaft 184, so that the bottom and top of the filter 21 are compressed or released at the same time, ensuring the sealing between the entire filter 21 and the housing.

[0160] It should be noted that the motor, as a driving source, provides reliable power transmission and reduces errors caused by manual operation. In addition, the stability and durability of the motor ensure the long-term effective operation of the clamping device 18. The motor-driven clamping device 18 can be easily integrated into the automation system to realize the automation of the filter 21 replacement and clamping process, thereby improving efficiency and safety.

[0161] Based on the above-mentioned specific embodiments, the driving mechanism is a handle connected to the first end of the rotating shaft 184. When the cam mechanism is in contact with the long foot plate, the handle is in a non-blocking position of the shell opening; when the cam mechanism is not in contact with the long foot plate, the handle is in a blocking position of the shell opening.

[0162] In a specific embodiment, the clamping device 18 can be manually driven to achieve the clamping and releasing of the U-shaped clamping plate 181 through a handle connected to the first end of the rotating shaft 184. The handle is directly connected to the first end of the rotating shaft 184, and the operator can control the rotation of the rotating shaft 184 by rotating the handle, thereby driving the cam mechanism and the clamping mechanism. This design allows the operator to manually adjust the clamping force as needed, and is suitable for occasions that require frequent manual operation.

[0163] The position of the handle is designed to facilitate operation. When the cam mechanism contacts the long foot plate, the long foot plate is separated from the filter 21, and the handle is located in the non-blocking position of the shell opening, that is, the handle is in a horizontal state and the handle does not overlap with the shell opening, and the clamping device 18 is in a state of loosening and replacing the filter 21, the filter 21 can be pulled out. When the cam mechanism is not in contact with the long foot plate, the long foot plate presses the filter 21, and the handle is located in the blocking position of the shell opening, that is, the handle is in a vertical state and the handle blocks the shell opening, the handle can just prevent the filter 21 from being pulled out.

[0164] When the clamping device 18 is manually driven, the device has a function of preventing misoperation. The position design of the handle helps to prevent misoperation, so as to ensure that the filter 21 will not move outward due to misoperation when it is clamped, thereby ensuring the safety of operation. Manually rotating the shaft 184 has a simple structure, low cost, does not rely on external energy, and is relatively simple to maintain.

[0165] On the basis of the above-mentioned specific embodiments, a fitting judgment mechanism is further included for judging whether the filter 21 fits the sealing surface 22. The fitting judgment mechanism includes:

[0166] A plurality of distance sensors disposed at each corner of the sealing surface 22 for detecting the distance between the sealing surface 22 and the filter 21;

[0167] A first fitting control unit connected to the distance sensors is used to control the driving mechanism to stop running when all the distance sensors detect that the distance between the sealing surface 22 and the filter 21 is zero.

[0168] In practical applications, the fitting judgment mechanism is an automated detection system for ensuring that the filter 21 fits the sealing surface 22 correctly. This system includes a plurality of distance sensors and a first fitting control unit, wherein the distance sensors are arranged at each corner of the sealing surface 22 to detect the distance between the sealing surface 22 and the filter 21. Through these sensors, the system can know whether the filter 21 has been correctly placed on the sealing surface 22.

[0169] The first fitting control unit is connected to all the distance sensors, receives signals from the sensors, and determines whether the filter 21 is completely fitted with the sealing surface 22. When all the distance sensors detect that the distance between the sealing surface 22 and the filter 21 is zero, it is determined that the filter 21 is completely fitted, and the first fitting control unit controls the driving mechanism to stop operating.

[0170] Based on the above embodiment, the fit judgment mechanism can automatically detect whether the filter 21 has been correctly installed, thereby reducing the need for manual inspection and improving the safety and reliability of the system.

[0171] Based on the above specific embodiments, the fitting judgment mechanism further includes:

[0172] A pressure sensor installed on each corner contact surface of the sealing surface 22 and the filter 21 to detect the pressure between the sealing surface 22 and the filter 21;

[0173] A second fitting control unit connected to the pressure sensor is used to control the driving mechanism to stop running when all the pressure sensors detect that the pressures between the sealing surface 22 and the filter 21 are equal.

[0174] In actual application, the fit judgment mechanism is to ensure that the filter 21 and the sealing surface 22 fit correctly and maintain the required pressure during the entire operation. The fit judgment mechanism includes a pressure sensor and a second fit control unit. The pressure sensor is also installed on each corner contact surface between the sealing surface 22 and the filter 21 to detect the pressure between the sealing surface 22 and the filter 21. These sensors ensure that the pressure on the entire sealing surface 22 is evenly distributed after the filter 21 is fitted. The second fit control unit is connected to the pressure sensor to monitor the data of all pressure sensors. When all pressure sensors detect that the pressure between the sealing surface 22 and the filter 21 is equal, it means that the pressure has been evenly distributed, and the control unit will control the drive mechanism to stop running to ensure that it is not over-pressurized, thereby avoiding possible damage or leakage.

[0175] Based on the above embodiment, the fit judgment mechanism can ensure the correct installation and sealing of the filter 21. By real-time monitoring of distance and pressure, the safety and reliability of the filtration system are improved, while reducing the need for manual inspection, ensuring the sealing of the filter 21 during the pressing process, and preventing leakage or other problems caused by improper installation.

[0176] In a preferred embodiment, a positioning and pulling-out device 19 for a bag-in-bag-out filter comprises a support seat 191 installed on the bottom surface of the shell, a guide rail is provided in the inner groove of the support seat 191, the guide rail is perpendicular to the panel 23 of the shell, and a through hole aligned with the guide rail is provided on the panel 23; it also comprises a pull-out rod 192 connected to the guide rail and sleeved in the through hole, the inner end of the pull-out rod 192 has a baffle perpendicular to the guide rail, and the outer end has a handle, the handle is located on the outside of the panel 23, and the support seat 191 is provided with an avoidance groove adapted to the baffle. When in use, the filter 21 is placed on the support seat 191, the back of the filter 21 rests on the baffle, and the pull-out rod 192 moves along the guide rail and the through hole to pull the filter 21 out or send it into the shell.

[0177] In the above structure, the positioning and pulling device 19 for the bag-in-bag-out filter is a device for safely replacing the filter 21. It is used in occasions requiring high safety, such as biosafety laboratories, hospital isolation areas, industrial chemical gas emissions and other environments. It can prevent the leakage of pollutants inside the filter 21, thereby protecting the safety of operators and the environment.

[0178] The positioning and pulling device 19 comprises a support seat 191, a guide rail, a pulling rod 192, a baffle and a handle. The filter 21 is installed in the housing. The support seat 191 is installed on the bottom surface of the housing to support the filter 21. The inner side of the support seat 191 has a groove. Preferably, the support seat 191 is a concave seat. The guide rail is arranged in the inner groove of the support seat 191. The guide rail is perpendicular to the panel 23 of the housing, that is, along the pulling direction of the filter 21. A through hole is arranged on the panel 23, and the through hole is aligned with the guide rail. The pulling rod 192 passes through the through hole and enters the guide rail. The pulling rod 192 moves along the through hole and the guide rail to pull out or put in the filter 21. The baffle is arranged at the inner end of the pulling rod 192, and the baffle is perpendicular to the guide rail to determine the initial position of the filter 21 placed on the support seat 191. The handle is arranged at the outer end of the pulling rod 192, and the handle is located outside the panel 23, which is convenient for the operator to pull. The escape groove is provided on the support seat 191 and is adapted to the baffle plate to provide an escape space for the baffle plate when the pull-out rod 192 moves.

[0179] When in use, the filter 21 is placed on the support seat 191, the back of the filter 21 is against the baffle, and the pull handle is pulled to move the pull-out rod 192 along the guide rail and the through hole, so that the filter 21 is pulled out or sent into the shell. Specifically, when sending the filter 21 into the shell, the filter 21 is placed on the support seat 191, the filter 21 is pushed, the back of the filter 21 is against the baffle, and the filter 21 is continued to be pushed, and the filter 21 is sent into the shell together with the positioning and pulling device 19. When pulling out the filter 21, the handle is pulled outward outside the panel 23, and the pull-out rod 192 and the baffle are pulled out together, and the baffle pushes the filter 21 to be pulled out.

[0180] By using the positioning and pulling-out device 19 provided in the embodiment of the present invention, when replacing the filter 21, people do not need to reach into the equipment on which the filter 21 is installed, and the filter 21 can be pulled out by pulling the handle from the outside, thereby realizing quick replacement of the filter 21; at the same time, the side wall of the filter 21 can be made to fit more closely with the opening of the shell, thereby ensuring the safety and sealing of the operation process; by positively pulling the filter 21 with a larger volume and weight through the positioning and pulling-out device 19, it is easy to apply force, and the operation is convenient and more labor-saving.

[0181] On the basis of the above-mentioned specific embodiments, a limiting mechanism for judging whether the filter 21 is in place is also included, and the limiting mechanism includes:

[0182] The limit block installed on the handle,

[0183] A sensing block mounted on the panel 23 and cooperating with the limit block;

[0184] A first in-position limiting component is connected to the sensing block and is used to send an in-position signal when the limiting block contacts the sensing block.

[0185] In actual application, in order to ensure that the filter 21 can be accurately delivered to the specified position, a limit mechanism is set in the positioning and pulling device 19. The limit mechanism may include a limit block, a sensing block and a first in-place limit component. The limit block is installed on the handle, and the sensing block is installed on the panel 23. The sensing block cooperates with the limit block. The limit block and the sensing block are equivalent to limit switches. When the filter 21 is delivered into the shell and the limit block contacts the sensing block, a signal is triggered, indicating that the filter 21 has reached the correct position, thereby confirming that the filter 21 has reached the correct position. The first in-place limit component is connected to the sensing block. When the limit block contacts the sensing block, the first in-place limit component will send an in-place signal to prompt the operator that the filter 21 has been correctly placed.

[0186] The design of this limiting mechanism can improve the accuracy and safety of replacing the filter 21, ensure that the filter 21 will not be displaced during the replacement process, and ensure the correct installation and sealing of the filter 21, thereby avoiding possible risks of contamination and leakage.

[0187] On the basis of the above-mentioned specific embodiments, the handle is a C-shaped handle, the middle part of the C-shaped handle is connected to the pull-out rod 192, the abutting parts at both ends face the panel 23, the abutting parts at both ends are parallel and equal in length, the limit blocks are the abutting parts at both ends, and the first in-position limit component is used to send a correct in-position signal when the limit blocks at both ends are in contact with the sensing block.

[0188] In actual application, the C-shaped handle is used as an operating part, the middle part of which is connected to the pull-out rod 192, and the abutting parts at both ends face the panel 23. The abutting parts at both ends are parallel and equal in length. This design makes the operation more stable and convenient for the palm to hold when pulling out.

[0189] The limit blocks are detection components, which are the abutment parts at both ends of the C-shaped handle, and are used to detect the position of the baffle in the shell. There are two limit blocks, namely the abutment parts at both ends of the C-shaped handle. Of course, there can be more than one limit block. When two or more limit blocks are in contact with the sensing block, it means that the C-shaped handle is accurately positioned, the filter 21 is straight, and the orientation is correct, that is, the filter 21 is not offset or tilted. The correct signal of the first in-place limit component can inform the operator that the filter 21 has been correctly placed and the next operation in the automatic control system can be carried out.

[0190] Furthermore, when the filter 21 is pushed into the device, after the flat heads of the abutting parts at both ends of the C-shaped handle come into contact with the panel 23, the filter 21 can no longer be pushed forward because the abutting parts press against the panel 23, thereby realizing the function of positioning the filter 21 and preventing the filter 21 from being installed in the wrong position.

[0191] Based on the above specific embodiments, the limiting mechanism further includes:

[0192] A position sensor for detecting the position of the baffle in the housing;

[0193] A second in-position limiting component is connected to the position sensor and is used to send an in-position signal when the detection baffle reaches a set position in the shell.

[0194] In practical applications, in the positioning and pulling device 19, the design of the limiting mechanism adds position detection and in-position signal functions to ensure accurate positioning of the filter 21 and convenient operation.

[0195] The working principle of the limit mechanism is that the sensing block is installed on the panel 23 and cooperates with the limit block. When the limit block contacts the sensing block, it can be confirmed that the baffle has reached the set position in the shell. The first in-place limit component is connected to the sensing block. When the limit block contacts the sensing block, an in-place signal is sent. The first in-place limit component prompts the operator that the filter 21 has reached the correct position. The position sensor is used to detect the position of the baffle in the shell to ensure that the baffle is correctly positioned. The second in-place limit component is connected to the position sensor. When it is detected that the baffle has reached the set position in the shell, an in-place signal is sent, providing double protection to ensure the accurate positioning of the filter 21.

[0196] Based on the above-mentioned limiting mechanism, through the contact between the limiting block and the sensing block, and the cooperation between the position sensor and the second in-place limiting component, double detection of the position of the filter 21 is achieved, further realizing precise control of the position of the filter 21 and improving the safety and accuracy of the operation.

[0197] On the basis of the above-mentioned specific embodiments, a positioning component for detecting parallel contact between the filter 21 and the baffle is further included, and the positioning component includes:

[0198] Three contact sensors are arranged on the baffle plate facing the panel 23, wherein the three contact sensors are not collinear;

[0199] A positioning unit connected to the contact sensor for sending an accurate positioning signal when the filter 21 contacts the contact sensor.

[0200] In practical applications, the newly added positioning component in the positioning and pulling device 19 is to ensure that the filter 21 and the baffle can be in parallel and accurately contact. The positioning component includes a contact sensor and a positioning unit.

[0201] The contact sensor is arranged on the side of the baffle plate facing the panel 23. There are three contact sensors. These three sensors are not collinear, which means that their positions distributed in space are not on the same straight line. In this way, the contact between the filter 21 and the baffle plate can be detected from different angles, ensuring the all-round accurate positioning of the filter 21 and enhancing safety and reliability. The contact sensor can be mechanical, such as a micro switch, or electronic, such as a capacitive or inductive sensor. They can detect small changes in distance, thereby ensuring precise contact between the filter 21 and the baffle plate.

[0202] The positioning unit is connected to the contact sensors. When the filter 21 contacts all the contact sensors, the positioning unit will send out an accurate positioning signal to inform the operator that the filter 21 has been correctly aligned, or for the next operation in the automatic control system.

[0203] In the above embodiment, when the filter 21 is correctly placed on the baffle, the contact sensor will be triggered, and then the positioning unit will send a signal, indicating that the filter 21 has been accurately positioned on the baffle. By using multiple contact sensors, the accuracy and reliability of positioning are improved, and the automation and convenience of operation of the positioning and pulling device 19 are improved. Through precise positioning, it can be ensured that the filter 21 will not be displaced during the replacement process, thereby avoiding possible contamination risks.

[0204] Based on the above-mentioned specific embodiments, the baffle is a T-shaped plate, the lower end of the vertical plate of which is connected to the inner end of the pull-out rod 192, and the upper end is connected to the horizontal plate. The vertical plate is along the vertical direction, and the width of the avoidance groove is equal to the width of the vertical plate. The contact sensors are respectively located at the lower part of the vertical plate and the two ends of the horizontal plate.

[0205] In practical applications, in the positioning and pulling device 19, the baffle is designed as a T-shaped plate, which helps to provide stable support and precise positioning for the filter 21 when the pulling rod 192 moves.

[0206] The T-shaped baffle includes a vertical plate and a horizontal plate. The vertical plate portion is installed along the vertical direction, and its lower end is connected to the inner end of the pull-out rod 192, and the upper end is connected to the horizontal plate. Such a structure allows the baffle to move with the pull-out rod 192, while providing vertical support for the filter 21. The horizontal plate portion is connected to the upper end of the vertical plate, providing horizontal support for the filter 21, ensuring that the filter 21 is stable in the horizontal direction. The T-shaped baffle increases the contact area between the device and the back of the filter 21, ensuring that the filter 21 is pulled out in a straight line, preventing the filter 21 from deviating when being pulled out, thereby preventing the filter 21 from deviating, resulting in an increase in the contact force between the filter 21 sealant and the sealing surface 22, and increasing the additional moving pulling force.

[0207] The width of the avoidance groove on the support seat 191 is equal to the width of the vertical plate, so that the vertical plate can move freely in the avoidance groove without additional friction or resistance, ensuring smooth operation of the pull-out rod 192.

[0208] The contact sensor located at the bottom of the vertical plate is used to detect whether the filter 21 is in contact with the vertical plate portion of the baffle. When the filter 21 is fed in, this sensor first contacts the filter 21 and sends a signal indicating that the filter 21 starts to move. The contact sensors at both ends of the horizontal plate are used to detect whether the edge of the filter 21 is in parallel contact with the horizontal plate portion of the baffle. When both sensors are triggered, it means that the filter 21 has been fully aligned and in parallel contact with the baffle.

[0209] The above embodiment ensures that the filter 21 can be accurately docked with the baffle in three dimensions when being pulled out or put into the housing. The signal of the contact sensor can be used to confirm the position of the filter 21, and the structure of the T-shaped baffle provides the necessary mechanical support to ensure the stability and safety of the operation, so that the positioning and pulling device 19 can realize the rapid, accurate and safe replacement of the filter 21.

[0210] On the basis of the above-mentioned specific embodiments, at least two sliding blocks cooperating with the guide rails are provided on the pull-out rod 192 .

[0211] In practical applications, at least two sliders are provided on the pull-out rod 192, which cooperate with the guide rail and can be two, three or more, and the specific number depends on the length of the pull-out rod 192 and the required stability. Multiple sliders can provide better support and stability and reduce the shaking of the pull-out rod 192 during movement. The slider can be designed to fit the shape of the guide rail tightly to ensure smooth sliding. The slider can be made of plastic, metal or other wear-resistant materials to reduce friction and wear. The shape and size of the guide rail need to match the slider to ensure that the slider can move freely in the guide rail without getting stuck. The guide rail can be linear or curved, depending on the design of the device and the moving path of the filter 21. The design and position of the slider can affect the positioning accuracy of the pull-out rod 192. By accurately controlling the position and movement of the slider, the precise positioning of the pull-out rod 192 can be achieved.

[0212] In the above embodiment, the pull-out rod 192 is connected to the guide rail through a plurality of sliders, which can disperse the weight of the pull-out rod 192 and reduce the pressure on a single slider, thereby improving the smoothness of movement; the wear of the pull-out rod 192 and the guide rail can be reduced because they can share the friction force generated when the pull-out rod 192 moves, ensuring the precise positioning and smooth movement of the filter 21 when it is inserted into or pulled out of the shell, thereby improving the safety and efficiency of the operation.

[0213] Preferably, the slider and the pull-out rod 192 are detachably connected to facilitate quick replacement when worn or damaged, easy replacement and maintenance, and reduced equipment downtime.

[0214] On the basis of the above-mentioned specific embodiments, a linear bearing is provided in the through hole of the panel 23. Different types of linear bearings can be selected according to application requirements, such as plastic linear bearings or metal linear bearings. The pull-out rod 192 is slidably connected to the linear bearing, that is, the pull-out rod 192 can move smoothly in the linear bearing. This connection method allows the pull-out rod 192 to slide freely in the linear bearing, and the pull-out rod 192 moves precisely along a straight path, reducing friction and wear, improving the stability and accuracy of movement, and achieving smooth linear motion.

[0215] Based on the above-mentioned specific embodiments, the front part of the pull-out rod 192 is connected with a limit plate parallel to the baffle, the vertical distance between the baffle and the limit plate is equal to the thickness of the filter 21, and the support seat 191 is provided with an avoidance opening that cooperates with the limit plate.

[0216] In actual application, the limit plate connected to the front of the pull-out rod 192 is parallel to the baffle plate, ensuring that the edge of the filter 21 is properly aligned with the baffle plate when the filter 21 is installed in the housing. The vertical distance between the baffle plate and the limit plate is set to be equal to the thickness of the filter 21, ensuring that the filter 21 can be correctly placed on the baffle plate when installed to achieve precise positioning.

[0217] The support seat 191 is provided with an avoidance opening that cooperates with the limit plate. When the pull-out rod 192 is pulled out or pushed in, the limit plate can pass through the avoidance opening smoothly, allowing the limit plate to pass smoothly during the movement of the pull-out rod 192 to avoid interference with the support seat 191, thereby ensuring smooth operation and smooth movement of the filter 21.

[0218] When the filter 21 is installed into the housing, the limit plate is flush with the support seat 191, or is lower than the support seat 191, or the limit plate is not connected to the pull-out rod 192, so as to ensure that the back of the filter 21 rests against the baffle smoothly. When the back of the filter 21 rests against the baffle, the limit plate is perpendicular to the support plate, that is, parallel to the baffle. At this time, the distance between the limit plate and the baffle ensures the correct placement of the filter 21, ensures the positioning accuracy of the filter 21 during the pulling out and loading process, and reduces the risk of damage to the filter 21 or poor sealing due to inaccurate positioning. When the filter 21 needs to be pulled out, the pull-out rod 192 can smoothly pass through the avoidance port and pull out the filter 21 together with the limit plate, avoiding the displacement or tilting of the filter 21 during the removal process. When the filter 21 is pulled out of the panel 23 and lifted down from the installation port, similar to when the filter 21 is installed into the shell, the limit plate is flush with the support seat 191, or lower than the support seat 191, or the limit plate is not connected to the pull-out rod 192, so that the filter 21 can be moved out from the support seat 191.

[0219] In the above embodiment, when the positioning and pulling device 19 pulls the filter 21, the front and back of the filter 21 are positioned on both sides through the baffle and the limit plate to prevent the filter 21 from rotating, tilting, and shifting, thereby ensuring the precise positioning of the filter 21 during the loading and unloading process, thereby improving the operating convenience, speed, accuracy and safety of the entire device.

[0220] On the basis of the above-mentioned specific embodiments, the limiting plate is rotatably connected to the pulling rod 192 so that the limiting plate is flush with or perpendicular to the supporting seat 191 .

[0221] In actual application, in order to realize different connection states of the limit plate, the limit plate and the pull-out rod 192 are set to be rotatably connected, that is, when the filter 21 is placed on the support seat 191 or removed from the support seat 191, the limit plate can be adjusted to a position flush with the support seat 191 through the rotation connection, providing more space for the filter 21 and the operator. When pulling the filter 21 into the housing or removing it from the housing, the limit plate can be adjusted to a position perpendicular to the support seat 191, providing additional support and positioning for the filter 21, ensuring the precise positioning of the filter 21 during the loading and unloading process.

[0222] Of course, the rotational connection between the limit plate and the pull-out rod 192 is only a preferred implementation mode, and is not the only one. The limit plate and the pull-out rod 192 may also be detachably connected or liftably connected, so that the position of the limit plate can be easily adjusted as needed, providing precise positioning during operation to ensure the smooth installation of the filter 21.

[0223] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0224] The bag-in-bag-out filter provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this article, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bag-in-bag-out filter, characterized in that: The invention comprises a shell provided with an air inlet and an air outlet in the width direction, a filter installed in the shell and located between the air inlet and the air outlet, an aerosol diffusion device (17) installed between the air inlet and the filter inlet for injecting aerosol into the shell, a downstream gas sampling device and a bacterial sheet placement device (10) installed between the filter outlet and the air outlet, wherein the downstream gas sampling device is used to collect gas filtered by the filter, and the bacterial sheet placement device (10) comprises a single-head sealed tube (101) whose open end is inserted into a connecting hole of the shell and is sealedly connected to the connecting hole, and a multi-section mesh tube (103) connected to the open end of the single-head sealed tube (101) and having mesh holes on the tube wall, wherein the head and tail of the mesh tube (103) are detachably connected in sequence, and bacterial sheets are placed in the mesh tube (103).

2. The bag-in-bag-out filter according to claim 1, characterized in that: The mesh tube (103) is provided with a partition (102) perpendicular to its axis, the end of the last mesh tube (103) is connected to a plug (106), the head and tail of the mesh tube (103) are directly connected via an internal thread (105), and the single-head sealing tube (101) and the connecting hole are connected via a perforated chuck (104).

3. The bag-in-bag-out filter according to claim 1, characterized in that: The shell is provided with an upstream gas sampling port (2) between the aerosol diffusion device (17) and the filter inlet; and also includes a gas failure detection mechanism for judging that the injected aerosol is unqualified when the aerosol concentration collected from the upstream gas sampling port (2) is less than a set threshold value.

4. The bag-in-bag-out filter according to claim 3, characterized in that: The downstream gas sampling device comprises a scanning leak detection device (20) located at the front end of the bacterial sheet placement device (10) and a total filtration efficiency detection port (12) located at the rear end of the bacterial sheet placement device (10); and also comprises an installation detection mechanism for judging that the filter is incorrectly installed when the difference between the aerosol concentration collected from the scanning leak detection device (20) and the aerosol concentration collected from the total filtration efficiency detection port (12) is greater than a set value.

5. The bag-in-bag-out filter according to claim 4, characterized in that: The scanning leak detection device (20) comprises a scanning tube (202) arranged vertically and having a vertical slot, a driving mechanism for driving the scanning tube (202) to move in the depth direction of the shell, and a glue outlet pipe connected to the scanning tube (202), wherein an aerosol outlet (9) of the glue outlet pipe is connected to the aerosol concentration detection device outside the shell, and the vertical slot faces and is closely attached to the central window of the filter.

6. The bag-in-bag-out filter according to claim 5, characterized in that: The installation detection mechanism comprises: A concentration detection unit for dynamically detecting the aerosol concentration corresponding to the real-time position of the scanning tube (202) during its movement; A position sensor for detecting the real-time position of the scanning tube (202); A data acquisition unit connected to the aerosol concentration and the position sensor and used to acquire the corresponding relationship between the real-time position and the real-time concentration of the scanning tube (202); A position detection unit is used to find out the aerosol collection position information corresponding to when the aerosol concentration is greater than a set value according to the data collection unit.

7. The bag-in-bag-out filter according to claim 1, characterized in that: The aerosol diffusion device (17) comprises an aerosol main injection tube connected to the aerosol injection port (4) on the shell, a multi-section aerosol shunt tube one end of which is connected to the glue outlet of the aerosol main injection tube, and a terminal injection tube connected to the other end of the aerosol shunt tube, wherein the aerosol shunt tube and the terminal injection tube are on a vertical plane parallel to the air inlet surface of the filter, and the multi-section aerosol shunt tubes are spaced at a set angle.

8. The bag-in-bag-out filter according to claim 7, characterized in that: It also includes a gas diffusion turbulence plate (16) arranged between the air inlet and the aerosol diffusion device (17), the gas diffusion turbulence plate (16) is parallel to the cross section perpendicular to the axis of the air inlet, the gas diffusion turbulence plate (16) is evenly distributed with ventilation holes, there is a gap between the edge of the gas diffusion turbulence plate (16) and the inner wall of the shell, the terminal injection tube and the aerosol diversion tube are both provided with ventilation holes, and the area surrounded by the terminal injection tube covers the entire air inlet surface of the filter.

9. The bag-in-bag-out filter according to any one of claims 1 to 8, characterized in that: An inspection door (5) is mounted on the inspection opening of the housing, a panel (23) on the outer periphery of the inspection opening is provided with connecting bolts, the right-angled side of the inspection door (5) is of equilateral chamfered type, a connecting sleeve is provided on the triangular plane (521) of the inspection door (5), the connecting sleeve is sleeved on the connecting bolt, and the cylinder of the connecting sleeve has a conical hole (523) with a gradually increasing inner diameter at one end close to the panel (23).

10. The bag-in-bag-out filter according to claim 9, characterized in that: The housing is provided with a pressure relief device, and the pressure relief device comprises: A pressure sensor for detecting the pressure in the housing; A high efficiency filter device (13) connected to the pressure sensor and to the pressure relief port of the housing, for controlling the pressure relief of the bag-in-bag-out filter when it is detected that the pressure difference between the pressure inside the housing and the external pressure is greater than a set value before the inspection door (5) is opened.

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