Mechanical filtration-based biosafety cabinet

Abstract

The application discloses a biosafety cabinet based on mechanical filtration, which comprises a shunt cover, a fan and a working area; the air inlet end of the shunt cover is sealingly connected to the air supply port of the fan, and the air extraction end is used for extracting air in the working area; the air outlet end of the shunt cover is sealingly connected to a filter screen; the working area is located below the filter screen; the air volume generated by the fan is blown to the working area after shunting in the shunt cover and filtering in the filter screen, meanwhile, the air volume in the working area is extracted by the air extraction end of the fan and blown to the shunt cover again; a second shunt cover is sleeved on the outer periphery of a third shunt cover, a first shunt cavity is formed between the inner wall of the second shunt cover and the outer wall of the third shunt cover, a first shunt cover is sleeved on the outer periphery of the second shunt cover, and a second shunt cavity is formed between the inner wall of the first shunt cover and the outer wall of the second shunt cover; a third shunt cavity is formed in the third shunt cover; the air volume generated by the fan is blown to the working area through the first shunt cavity, the second shunt cavity and the third shunt cavity.

Description

Technical Field

[0001] This invention relates to the field of biosafety cabinets, specifically a biosafety cabinet based on mechanical filtration. Background Technology

[0002] Biosafety cabinets are classified into types A1, A2, B1, and B2. The dual-fan type B2 biosafety cabinet includes a supply fan and an exhaust fan. The supply fan draws outside air into the supply air box, where it passes through a supply air filter before entering the work area, creating a downward clean airflow. The exhaust fan sends unclean air from the work area, along with some outside air, into the exhaust air box, where it is then discharged into the external environment through an exhaust air filter.

[0003] For backward centrifugal fans, due to their axial air intake and radial air outlet characteristics, the air velocity in the lower area of ​​the centrifugal fan is relatively low. Consequently, when the air in this area passes through the air supply filter to form a downward clean airflow, the air velocity is relatively low. Conversely, the air velocity in the area corresponding to the centrifugal fan outlet is relatively high. Consequently, when the air in this area passes through the air supply filter to form a downward clean airflow, the air velocity is relatively high. This results in uneven downward clean airflow velocity entering the working area, leading to cross-contamination of products. Summary of the Invention

[0004] The purpose of this invention is to provide a biosafety cabinet based on mechanical filtration to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a biosafety cabinet based on mechanical filtration, comprising a hood, a fan, and a working area; the air inlet of the hood is sealed and connected to the air outlet of the fan, and the air outlet of the hood is used to extract air from the working area; the air outlet of the hood is sealed and connected to a filter screen; the working area is located below the filter screen; the airflow generated by the fan is blown to the working area after being diverted by the hood and filtered by the filter screen, while the air outlet of the fan extracts the airflow from the working area and blows it back to the hood;

[0006] The flow divider includes a first flow divider, a second flow divider, and a third flow divider; the second flow divider is fitted around the outer periphery of the third flow divider, forming a first flow divider cavity between the inner wall of the second flow divider and the outer wall of the third flow divider; the third flow divider forms a third flow divider cavity inside the third flow divider; the airflow generated by the fan is blown to the working area through the first flow divider cavity, the second flow divider cavity, and the third flow divider cavity.

[0007] Preferably, the outer wall of the third diverter is fixedly connected with a pair of symmetrically distributed fixing parts, and the side of the pair of fixing parts is provided with a pair of "cross" shaped sliding grooves facing opposite directions; the second diverter is fixedly connected with a pair of symmetrically distributed L-shaped fixing rods, the vertical part of the fixing rods penetrates through the second diverter, and the end near the fixing part is fixedly connected with a horizontal blocking part for matching the sliding groove.

[0008] Preferably, a pair of symmetrically distributed fixing parts 2 are fixedly connected to the outside of the second diverter, and the pair of fixing parts 2 have a pair of sliding grooves 2 facing opposite directions and are located on the lower side of the horizontal part of the fixing rod 1; a pair of symmetrically distributed fixing rods 2 are fixedly connected to the inner wall of the first diverter, and the ends of the fixing rods 2 near the fixing parts 2 match the sliding grooves 2.

[0009] Preferably, the second fixed rod further includes a limiting block, a balancing block, and a sliding block; the limiting block is fixedly connected to the middle part of the second fixed rod, the balancing block is fixedly connected to the second fixed rod near the bottom end and located on the upper side of the second fixed part; the sliding block is slidably connected to the upper side of the balancing block and is located on one side of the opening of the second sliding groove.

[0010] Preferably, the height of the limiting block corresponds to the horizontal portion of the fixing rod, and the limiting block has a blocking groove on the side facing the fixing rod to prevent the rotation of the fixing rod.

[0011] Preferably, a pair of sliding blocks have a pair of pulleys in frictional contact on their upper sides; a pair of conveyor belts are rotatably connected to the outer periphery of the middle of the pulleys, and the movement of the conveyor belts drives the pulleys to rotate, and the rotation of the pulleys drives the sliding blocks to move laterally left and right.

[0012] Preferably, a blocking block 1 is fixedly connected to the upper side of the fixing part 2. The blocking block 1 is located on the side of the balance block away from the outer wall of the second diverter. The blocking block 2 is fixedly connected to the upper part of the side of the fixing part 2 where the sliding groove 2 is not opened, so that the sliding block matches the groove 1 opened by the blocking block 1, and the side of the balance block away from the pulley matches the groove 2 opened by the blocking block 2.

[0013] Preferably, a pair of symmetrical transmission cavities are fixedly connected to the inner wall of the first diverter, and a roller is rotatably connected to the bottom end of the outer wall; a pair of conversion wheels are provided near the top of the second fixed rod, the transmission belt extends upward from the bottom and passes through the middle of the pair of conversion wheels, changes the direction of extension and enters the transmission cavity, and finally passes through the outer wall of the first diverter near the bottom end, and is rotatably connected to the outer periphery of the roller on the outer wall of the first diverter.

[0014] Preferably, a mating structure is installed on the side of the fixing part 1 and the fixing part 2 near the sliding groove 1 and the sliding groove 2, and the mating structure is snap-fitted with a guide rod; the fixing part 1 has a slot, which is close to the sliding groove 1.

[0015] Preferably, the mating structure includes a mating plate, multiple lifting rods, and a lifting plate; the mating plate is slidably connected in the slot and a spring is fixedly connected to its lower side; the lifting rods are slidably connected in the sliding holes opened in the fixing part one or the fixing part two, one end is fixedly connected to the lifting plate, and the other end is fixedly connected to the mating plate; the lifting plate is located in the transverse groove of the sliding groove one or the sliding groove two and is located below the blocking part.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The airflow generated by the fan is divided into three parts by the diversion hood, so that the airflow and velocity blown towards the filter screen are more uniform, ensuring that the airflow fully covers the filter screen, avoiding cross-infection, and preventing the leakage of polluted air drawn from the work area; thus improving safety.

[0018] The installation and fixing method of the diverter is simple and easy to operate. By rotating the second diverter and the first diverter, and the first diverter and the second diverter, it can be fixed in the vertical direction. At the same time, the sliding block is embedded into the slot one by the conveyor belt, so that the first diverter is completely fixed and cannot be rotated left or right, thus making the diverter completely fixed in the horizontal direction. The connecting structure of fixing part one, fixing rod one, and fixing part two occupies a small area and has a weak impact on air volume.

[0019] Guided by the guide rod, the fixed rod one or fixed rod two can be accurately embedded into the corresponding sliding groove one or sliding groove two, and the guide rod is snapped together with the matching structure, so that the guide rod will not remain in the first or second diversion cavity, thus affecting the airflow. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the interior of the front of the present invention;

[0021] Figure 2 This is a cross-sectional view of the flow divider.

[0022] Figure 3 This is a disassembled diagram of the fairing;

[0023] Figure 4 This is a schematic diagram of one structure of the fixing part of the present invention;

[0024] Figure 5 This is a schematic diagram of the connection between the fixing rod 2 and the fixing part 2 of the present invention;

[0025] Figure 6 This is an anatomical diagram of the pulley and sliding block of the present invention;

[0026] Figure 7 This is a cross-sectional view of two points on the fixing rod of the present invention;

[0027] Figure 8This is a schematic diagram of the structure at the limiting block of the present invention;

[0028] Figure 9 For the present invention Figure 7 Enlarged view of point A in the middle;

[0029] Figure 10 This is a schematic diagram of the structure of two fixing parts of the present invention;

[0030] Figure 11 This is a cross-sectional view of the transmission cavity on the inner wall of the first flow divider of the present invention;

[0031] Figure 12 This is a schematic diagram showing the direction change of conveyor belt 116 at the top of the second fixed rod.

[0032] Figure 13 This is a schematic diagram of the third flow divider being tilted and pre-rotated outside the second flow divider according to the present invention;

[0033] Figure 14 This is a schematic diagram showing the connection between the third and second flow dividers of the present invention;

[0034] Figure 15 This is a schematic diagram of the first flow divider being tilted and pre-rotated outside the second flow divider according to the present invention;

[0035] Figure 16 This is a schematic diagram showing the connection between the first and second flow dividers of the present invention;

[0036] Figure 17 This is a schematic diagram of the connection between the guide rod 14 and the mating structure 15 of the present invention;

[0037] Figure 18 This is a schematic diagram of the structure at position 142 of the buckle plate of the present invention;

[0038] Figure 19 This is a schematic diagram of the mating structure of the present invention;

[0039] Figure 20 This is a cross-sectional view of the structure of the present invention.

[0040] In the diagram: 1. Diverter shroud, 2. Fan, 3. Filter screen, 4. Working area, 11. First diverter shroud, 111. Fixing rod 2, 112. Limiting block, 113. Balance block, 114. Sliding block, 115. Pulley, 116. Conveyor belt, 12. Second diverter shroud, 121. Fixing rod 1, 122. Blocking part 1, 123. Blocking block 1, 124. Blocking block 2, 125. Fixing part 2, 13. Third diverter shroud, 131. Fixing part 1, 14. Guide rod, 141. Buckle plate, 142. Slot, 15. Mating structure, 151. Mating plate, 152. Spring, 153. Lifting rod, 154. Lifting plate. Detailed Implementation

[0041] Example 1:

[0042] Please see Figure 1-16 This invention provides a technical solution: a biosafety cabinet based on mechanical filtration, such as... Figure 1-3 The diagram shows a flow divider 1, a fan 2, and a working area 4. The air inlet of the flow divider 1 is sealed and connected to the air outlet of the fan 2, and the air outlet of the flow divider 1 is used to draw air from the working area 4. The air outlet of the flow divider 1 is sealed and connected to the filter screen 3. The working area 4 is located below the filter screen 3. The air generated by the fan 2 is blown to the working area 4 after being divided by the flow divider 1 and filtered by the filter screen 3. At the same time, the air outlet of the fan 2 draws the air from the working area 4 and blows it back to the flow divider 1.

[0043] The flow divider 1 includes a first flow divider 11, a second flow divider 12, and a third flow divider 13; the second flow divider 12 is fitted around the outer periphery of the third flow divider 13, forming a first flow divider cavity between the inner wall of the second flow divider 12 and the outer wall of the third flow divider 13; the first flow divider 11 is fitted around the outer periphery of the second flow divider 12, forming a second flow divider cavity between the inner wall of the first flow divider 11 and the outer wall of the second flow divider 12; a third flow divider cavity is formed inside the third flow divider 13; the air volume generated by the fan 2 is blown to the working area 4 through the first flow divider cavity, the second flow divider cavity, and the third flow divider cavity.

[0044] like Figure 2-4 As shown, the outer wall of the third diverter 13 is fixedly connected with a pair of symmetrically distributed fixing parts 131. A pair of "cross" shaped sliding grooves are opened on one side of the pair of fixing parts 131, and the pair of sliding grooves face opposite directions. The second diverter 12 is fixedly connected with a pair of symmetrically distributed fixing rods 121, which are L-shaped. The vertical part of the pair of fixing rods 121 penetrates the second diverter 12. A pair of transverse blocking parts 122 are fixedly connected to the ends of the pair of fixing rods 121 near the fixing parts 131, so that they can be embedded in the corresponding "cross" shaped sliding grooves, thereby movably connecting the second diverter 12 and the third diverter 13 together, so that the second diverter 12 and the third diverter 13 can move unidirectionally in the transverse plane, but cannot move up and down in the vertical plane.

[0045] like Figure 5-10 As shown, a pair of symmetrically distributed fixing parts 125 are fixedly connected to the outside of the second diverter 12 (see Figure 125). Figure 5 A pair of fixing parts 125 are provided with a pair of sliding grooves facing opposite directions; the pair of fixing parts 125 are located on the lower side of the transverse portion of a pair of fixing rods 121 (see...). Figure 2A pair of fixed rods 121 are located on the side of a pair of fixed parts 125 where the sliding grooves are not opened; a pair of symmetrically distributed fixed rods 111 are fixedly connected to the inner wall of the first diverter 11; the pair of fixed rods 111 can be embedded in a pair of sliding grooves; so that the first diverter 11 and the second diverter 12 can move unidirectionally in the horizontal plane, but cannot move up and down in the vertical plane.

[0046] Unlike the pair of fixed rods 121, each pair of fixed rods 111 also includes a limiting block 112, a balancing block 113, and a sliding block 114. The limiting block 112 is fixedly connected to the middle of the fixed rod 111, and its height corresponds to the lateral portion of the fixed rod 121. The limiting block 112 has a blocking groove on the side facing the fixed rod 121 to prevent the fixed rod 121 from rotating. The balancing block 113 is fixedly connected to the fixed rod 111 near its bottom end. The balancing block 113 is located on the upper side of the fixed part 125. The sliding block 114 is slidably connected to the balancing block 113. On one side, the sliding block 114 is located at one side of the opening of the sliding groove; the upper side of the sliding block 114 is in frictional contact with the pulley 115, and the rotation of the pulley 115 can drive the sliding block 114 to move through the friction between the sliding block 114 and the pulley 115; the diameter of the middle part of the pulley 115 is smaller than the diameter of the two ends, so that the outer circumference of the middle part of the pulley 115 is rotatably connected to the conveyor belt 116, and the conveyor belt 116 does not contact the lower sliding block 114; the movement of the conveyor belt 116 drives the pulley 115 to rotate, and the rotation of the pulley 115 drives the sliding block 114 to move laterally left and right;

[0047] Unlike the first fixing part 131, the second fixing part 125 has a first blocking block 123 fixedly connected to its upper side. The first blocking block 123 is located on the side of the balance block 113 away from the outer wall of the second diverter shroud 12. The second blocking block 124 is fixedly connected to the upper part of the side of the second fixing part 125 where the second sliding groove is not opened, so that the sliding block 114 can be inserted into the first groove opened in the first blocking block 123, and the side of the balance block 113 away from the pulley 115 can be inserted into the second groove opened in the second blocking block 124; thereby preventing the pair of fixing rods 111 from moving left and right.

[0048] like Figure 11-12As shown, a pair of symmetrical transmission chambers are fixedly connected to the inner wall of the first diversion hood 11, and rollers are rotatably connected to the outer wall. The rollers are located near the bottom of the first diversion hood 11 to facilitate the rotation of the rollers by the operator. A pair of conversion wheels are provided near the top of the second fixed rod 111. The conversion wheels are close to the transmission chambers. The conveyor belt 116 extends upward from the bottom and passes through the middle of the pair of conversion wheels, changing its extension direction to enter the transmission chamber. The position of the transmission chamber corresponds to the second fixed part 125. This allows the conveyor belt 116 to extend upward along the second fixed rod 111, pass through the transmission chamber, and finally emerge from the outer wall of the first diversion hood 11 near the bottom, and be rotatably connected to the outer circumference of the rollers on the outer wall of the first diversion hood 11. This allows the left and right movement of the sliding block 114 to be controlled by rotating the conveyor belt 116 from outside the first diversion hood 11.

[0049] Working principle: In use, first tilt the second diffuser 12 at a 5-10 degree angle and place it over the outside of the third diffuser 13 (see...). Figure 13 Then rotate the second distributor shroud 12 toward the opening of the sliding groove so that the bottom ends of a pair of fixed rods 121 are embedded in the sliding groove (see...). Figure 14 Similarly, the first diffuser 11 is tilted 5-10 degrees and fitted over the outside of the second diffuser 12 (see...). Figure 15 Then, the first diverter shroud 11 is rotated toward the opening of the second sliding groove, so that a pair of fixed rods 111 are embedded in the second sliding groove, and the opening directions of the first and second sliding grooves are the same; the lateral portion of the pair of fixed rods 121 is engaged with the blocking grooves opened by the pair of limiting blocks 112 to prevent the second diverter shroud 12 from rotating in the opposite direction; at the same time, the end of the balance block 113 away from the pulley 115 is embedded in the slot 2 opened by the second blocking block 124 to keep the balance block 113 balanced front and back; then the roller is rotated to drive the conveyor belt 116 located on the outer wall of the first diverter shroud 11 (see Figure 11 The conveyor belt 116 rotates, causing the pulley 115 to rotate. The pulley 115 rotates, causing the sliding block 114 to move towards the second slot, so that the sliding block 114 is embedded in the second slot. Then, the roller on the outer wall of the first diversion hood 11 is fixed to prevent the conveyor belt 116 from rotating. At this time, the first diversion hood 11 cannot rotate in the opposite direction, ensuring the overall stability of the first diversion hood 11, the second diversion hood 12, and the third diversion hood 13. Then, the first diversion hood 11 is installed on the upper part of the filter screen 3 and sealed. Finally, the upper end of the first diversion hood 1 is sealed and connected to the air outlet of the fan 2.

[0050] When the biosafety cabinet is started, the airflow generated by the fan 2 is blown into the distribution hood 1, and then through the first distribution chamber, the second distribution chamber, and the third distribution chamber, thereby guiding the airflow to be evenly distributed. After passing through the filter screen 3, the airflow is blown into the work area 4, avoiding uneven airflow into the work area 4 and preventing cross-infection.

[0051] Example 2:

[0052] Based on Embodiment 1, a mating structure 15 is installed on at least one fixing part 131 and fixing part 2 125 on the side near the sliding groove 1 and sliding groove 2, respectively. The mating structure 15 is snapped with a guide rod 14, which is used to guide the fixing rod 121 and fixing rod 2 111 to rotate and embed into the sliding groove 1 and sliding groove 2, making the positioning and installation between the first diversion shroud 11 and the second diversion shroud 12, as well as between the second diversion shroud 12 and the third diversion shroud 13, more convenient and faster; the guide rod 14 is located in the first diversion cavity and the second diversion cavity, respectively.

[0053] like Figure 17-20 As shown, the guide rod 14 is arc-shaped, and a buckle plate 141 is fixedly connected to the end near the fixing part 131; a slot 142 is provided on the side of the fixing part 131 near the sliding groove, and the slot 142 is close to the sliding groove.

[0054] The mating structure 15 includes a mating plate 151, multiple lifting rods 153, and a lifting plate 154. A spring 152 is fixedly connected to the lower side of the mating plate 151, and both springs are located within a slot 142. The mating plate 151 is slidably connected to the slot 142. Each lifting rod 153 is slidably connected to a sliding hole in a fixing part 131 between the sliding groove and the slot 142. One end is fixedly connected to the lifting plate 154, and the other end is fixedly connected to the mating plate 151. The lifting plate 154 is located within the transverse groove of the sliding groove and is below the blocking part 122. This allows the lifting plate 154 to be lowered when the blocking part 121 is above it, applying a downward force to the lifting plate 154. 4. The lifting rod 153 moves downward, thereby moving the mating plate 151 downward, applying a downward force to the spring 152. The spring 152 is compressed. When the blocking part 121 leaves the upper side of the lifting plate 154, the downward force of the lifting plate 154 disappears, and the spring 152 bounces upward, returning to its natural state, thereby moving the mating plate 151, the lifting rod 153, and the lifting plate 154 upward. A transition block is fixedly connected to the end of the lifting plate 154 to facilitate the smooth movement of the blocking part 121 to the upper side of the lifting plate 154. The mating plate 151 is used for snap-fit ​​connection with the snap-fit ​​plate 141. The second fixing part 125 has the same mating structure 15 as the first fixing part 131.

[0055] In use, first install the second diverter 12 and the third diverter 13 together. The operator first snaps the buckle plate 141 to the mating plate 151. Rotate the second diverter 12, and the fixing rod 121 rotates along the buckle plate 14, guiding the fixing rod 121 to rotate into the sliding groove. When the fixing rod 121 enters the sliding groove, the blocking part 122 retracts and touches the transition block. The contact transition block presses down on the lifting plate 154, thereby causing the mating plate 151 to move downward. The buckle plate 14 and the mating plate... 151 separates, the snap plate 14 falls off from the second diversion cavity until the blocking part 122 passes through the transition block, the spring 152 loses its downward pressure, and drives the mating plate 151, the lifting rod 153 and the lifting plate 154 to move upward, and retract the detached guide plate 14. When the diversion cover 1 is repaired and reinstalled in the future, the staff will snap the guide plate 14 back to the mating plate 151 and continue to perform the above operation; the installation of the first diversion cover 11 and the second diversion cover 12 is the same as described above.

[0056] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A biosafety cabinet based on mechanical filtration, characterized in that: It includes a splitter hood (1), a fan (2), and a working area (4); the air inlet of the splitter hood (1) is sealed and connected to the air outlet of the fan (2), and the exhaust end of the fan (2) is used to extract air from the working area (4); the air outlet of the splitter hood (1) is sealed and connected to the filter screen (3); the working area (4) is located below the filter screen (3); the air volume generated by the fan (2) is blown to the working area (4) after being split by the splitter hood (1) and filtered by the filter screen (3), and at the same time, the exhaust end of the fan (2) extracts the air volume of the working area (4) and blows it back to the splitter hood (1); The flow divider (1) includes a first flow divider (11), a second flow divider (12), and a third flow divider (13); the second flow divider (12) is fitted around the outer periphery of the third flow divider (13), forming a first flow divider cavity between the inner wall of the second flow divider (12) and the outer wall of the third flow divider (13); the first flow divider (11) is fitted around the outer periphery of the second flow divider (12), forming a second flow divider cavity between the inner wall of the first flow divider (11) and the outer wall of the second flow divider (12); a third flow divider cavity is formed inside the third flow divider (13); the air volume generated by the fan (2) is blown to the working area (4) through the first flow divider cavity, the second flow divider cavity, and the third flow divider cavity. The outer wall of the third diffuser (13) is fixedly connected with a pair of symmetrically distributed fixing parts (131), and the side of the pair of fixing parts (131) is provided with a pair of "cross" shaped sliding grooves facing opposite directions; the second diffuser (12) is fixedly connected with a pair of symmetrically distributed L-shaped fixing rods (121), the vertical part of the fixing rods (121) penetrates the second diffuser (12), and the end near the fixing part (131) is fixedly connected with a horizontal blocking part (122) for matching with the sliding grooves; The second diverter (12) is externally fixedly connected to a pair of symmetrically distributed fixing parts (125), and the pair of fixing parts (125) are provided with a pair of sliding grooves facing opposite directions and located on the lower side of the horizontal part of the fixing rod (121); the inner wall of the first diverter (11) is fixedly connected to a pair of symmetrically distributed fixing rods (111), and the ends of the fixing rods (111) near the fixing parts (125) match the sliding grooves. Fixed rod 2 (111) includes a limiting block (112); The height of the limiting block (112) corresponds to the horizontal part of the fixing rod (121). The limiting block (112) has a blocking groove on the side facing the fixing rod (121) to block the rotation of the fixing rod (121).

2. A biosafety cabinet based on mechanical filtration according to claim 1, characterized in that: The second fixed rod (111) also includes a balance block (113) and a sliding block (114); the limiting block (112) is fixedly connected to the middle of the second fixed rod (111), the balance block (113) is fixedly connected to the second fixed rod (111) near the bottom end and is located on the upper side of the second fixed part (125); the sliding block (114) is slidably connected to the upper side of the balance block (113) and is located on one side of the opening of the second sliding groove.

3. A biosafety cabinet based on mechanical filtration according to claim 2, characterized in that: A pair of sliding blocks (114) have a pair of pulleys (115) in frictional contact on their upper sides; a pair of conveyor belts (116) are rotatably connected to the outer periphery of the middle part of the pulleys (115). The movement of the conveyor belts (116) drives the pulleys (115) to rotate, and the rotation of the pulleys (115) drives the sliding blocks (114) to move laterally left and right.

4. A biosafety cabinet based on mechanical filtration according to claim 3, characterized in that: A blocking block 1 (123) is fixedly connected to the upper side of the fixing part 2 (125). The blocking block 1 (123) is located on the side of the balance block (113) away from the outer wall of the second diverter (12). A blocking block 2 (124) is fixedly connected to the upper part of the side of the fixing part 2 (125) where the sliding groove 2 is not opened, so that the sliding block (114) matches the slot 1 opened by the blocking block 1 (123), and the side of the balance block (113) away from the pulley (115) matches the slot 2 opened by the blocking block 2 (124).

5. A biosafety cabinet based on mechanical filtration according to claim 3, characterized in that: The inner wall of the first diversion hood (11) is fixedly connected to a pair of symmetrical transmission cavities, and the bottom of the outer wall is rotatably connected to a roller; the second fixed rod (111) is provided with a pair of conversion wheels near the top, the conveyor belt (116) extends upward from the bottom and passes through the middle of the pair of conversion wheels, changes the direction of extension and enters the transmission cavity, and finally passes through the outer wall of the first diversion hood (11) near the bottom and is rotatably connected to the outer circumference of the roller on the outer wall of the first diversion hood (11).

6. A biosafety cabinet based on mechanical filtration according to claim 1, characterized in that: The first fixing part (131) and the second fixing part (125) are fitted with a mating structure (15) on the side near the first sliding groove and the second sliding groove, and the mating structure (15) is snapped with a guide rod (14); the first fixing part (131) has a slot (142) which is close to the first sliding groove.

7. A biosafety cabinet based on mechanical filtration according to claim 6, characterized in that: The mating structure (15) includes a mating plate (151), multiple lifting rods (153) and a lifting plate (154); the mating plate (151) is slidably connected in the slot (142) and a spring (152) is fixedly connected to its lower side; the lifting rods (153) are slidably connected in the sliding holes opened in the first fixing part (131) or the second fixing part (125), one end is fixedly connected to the lifting plate (154), and the other end is fixedly connected to the mating plate (151); the lifting plate (154) is located in the transverse groove of the first sliding groove or the second sliding groove and is located below the first blocking part (122).

Images