Bacterial filter device for medical vacuum negative pressure unit

Abstract

This invention discloses a bacterial filtration device for medical vacuum negative pressure units, relating to the field of medical supplies technology. It includes a support frame installed inside an ultraviolet disinfection hood, with movable frames slidably installed inside two filtration chambers. A primary filter element is installed at equal intervals inside the upper movable frame, and a secondary filter element is installed at equal intervals inside the lower movable frame. Two working modules are installed on the side of the support frame, each including a drive mechanism, a switching mechanism, and a clamping mechanism. The switching mechanism is driven by the movable frame and drives it to slide. The clamping mechanism drives a pressing component to press the connecting pipe, causing the connecting pipe to shift and connect the air passage. This bacterial filtration device for medical vacuum negative pressure units achieves single-drive linkage switching and clamping mechanism operation through the working modules, automatically switching filtration positions and sealing the air passage. Simultaneously, a trigger mechanism monitors filter element lifespan, supporting online filter replacement without shutting down the system.

Description

Technical Field

[0001] This invention relates to the field of medical supplies technology, specifically to a bacterial filtration device for a medical vacuum negative pressure unit. Background Technology

[0002] In the medical environment, medical vacuum negative pressure units are important infrastructure in key areas such as hospital operating rooms, ICUs and isolation wards. They are mainly used to remove waste gas, blood, body fluids generated during surgery and polluted air in the ward. The safety and cleanliness of their operation are directly related to the health of patients and medical staff.

[0003] However, the human body constantly sheds bacteria through the respiratory tract, digestive tract, skin, and hair. These bacteria can be suspended in the air via droplets, dust, and other carriers. When a negative pressure system is used to ventilate the operating room or ward during a procedure, these droplets and dust particles containing bacteria are drawn into the system and participate in the circulation. If these bacteria are not treated, they will contaminate the air in the ward or operating room, affecting the patient's recovery efficiency.

[0004] Existing bacterial filtration devices mostly employ a single filter layer or a simple multi-layer stacked structure, resulting in a relatively limited filtration method. This makes them unable to classify and treat contaminants of different particle sizes, leading to low filtration efficiency. Furthermore, with increased usage time, the filter pores are easily clogged, causing a significant decrease in gas flow and affecting the normal operation of the negative pressure unit. Additionally, these devices typically require shutdown for filter replacement or maintenance, disrupting the continuity of medical operations.

[0005] Therefore, we propose a bacterial filtration device for medical vacuum negative pressure units to solve the problems mentioned above. Summary of the Invention

[0006] 1. The technical problem that the invention aims to solve: The purpose of this invention is to provide a bacterial filtration device for medical vacuum negative pressure units to solve the problems currently found in the market as described in the background art.

[0007] 2. Technical Solution: To achieve the above objectives, the present invention provides the following technical solution: a bacterial filtration device for a medical vacuum negative pressure unit, comprising a support frame installed inside an ultraviolet disinfection hood, an air inlet installed at the upper end of the support frame, and an air outlet installed at the lower end of the support frame, both the upper and lower ends of the support frame having filter chambers, both filter chambers having movable frames slidably installed inside, each filter chamber having connecting pipes installed at both the upper and lower ends, each connecting pipe having a squeezing member, the squeezing member being used to drive the connecting pipe to move to achieve air passage opening and closing; The upper movable frame has primary filter cartridges installed at equal intervals inside, and the lower movable frame has secondary filter cartridges installed at equal intervals inside. The primary and secondary filter cartridges work together to achieve graded filtration of bacteria. Two sets of working modules are installed on the side of the support frame. The two sets of working modules are arranged corresponding to two movable frames. The working modules include a drive mechanism, a switching mechanism and a clamping mechanism. The output end of the drive mechanism is connected to the switching mechanism and the clamping mechanism respectively to provide power; The switching mechanism is connected to the movable frame via a transmission, and is used to drive the movable frame to slide, so that the filter elements inside the movable frame move sequentially to the ventilation position. The clamping mechanism is used to drive the extruder to squeeze the connecting pipe, thereby displacing the connecting pipe and connecting the air passage.

[0008] Furthermore, the connecting pipe includes a telescopic pipe installed on the support frame, a sealing end plate is fixed at one end of the telescopic pipe near the corresponding filter chamber, a sealing ring is installed on the end face of the sealing end plate, and a reset member is connected between the sealing end plate and the support frame. The reset component includes a fixed cylinder fixed on a support frame and a movable rod fixedly installed on a sealing end plate. The movable rod is fitted inside the fixed cylinder, and a reset spring is connected between the fixed cylinder and the movable rod.

[0009] The above technical solution enables the sealing end plate to move under force, causing the sealing ring to adhere to the end face of the filter cartridge or movable frame. Subsequently, when the force is no longer applied, it moves in the opposite direction and resets under the action of the reset component.

[0010] Furthermore, the extrusion member includes a sliding frame that is slidably mounted vertically on the support frame, with rollers rotatably mounted on the side of the sliding frame, and a plurality of extrusion rods fixed on the side of the sliding frame near the corresponding connecting pipe, the extrusion rods being used to extrude the sealing end plate.

[0011] The above technical solution enables the sealing end plate to move by using the extrusion rod when the sliding frame is subjected to force.

[0012] Furthermore, the movable frame is provided with equally spaced vertically penetrating mounting slots, and a mounting plate is installed inside the mounting slot. A sealing ring is installed on the upper surface of the mounting plate.

[0013] The above technical solution allows the primary or secondary filter element to be installed in the mounting groove, and the sealing ring is used to improve the sealing performance. Furthermore, the drive mechanism includes a drive wheel and an intermittent wheel mounted on the support frame via bearings; A lever is installed on the drive wheel, and a limit wheel is fixed on the drive wheel; The intermittent wheel is provided with staggered grooves and limiting grooves; When the drive wheel rotates, the lever extends into the slot and drives the intermittent wheel to rotate synchronously; when the lever disengages from the slot, the limiting wheel fits tightly against the inner wall of the limiting slot, thereby restricting the intermittent wheel from rotating under external force and achieving the positioning of the intermittent wheel.

[0014] The above technical solution enables the intermittent wheel to rotate when the motor drives the drive wheel to rotate, and the intermittent wheel to rotate by the action of the lever and the slot, and the rotation of the intermittent wheel to be restricted by the action of the limit wheel and the limit slot.

[0015] Furthermore, the switching mechanism includes a driving gear, a guide gear, two driven gears, and two force-bearing racks; The drive gear is fixedly sleeved on the end of the intermittent gear; The guide gear and the two driven gears are all mounted on the support frame via bearings, and the guide gear meshes with the driving gear and the two driven gears respectively; The two force-bearing racks are installed on the upper and lower sides of the movable frame, and the two force-bearing racks mesh with the two driven gears respectively.

[0016] The above technical solution enables the intermittent wheel to rotate synchronously, which in turn drives the drive gear to rotate, and then drives the guide gear to rotate, thereby driving the two driven gears to rotate synchronously in the same direction.

[0017] Furthermore, the clamping mechanism includes a rotating wheel and two supports; The rotating wheel is fixedly installed on the end of the driving wheel, and two sets of driving tooth segments are symmetrically installed on the outer wall of the rotating wheel; Each of the brackets is fixedly mounted on the support frame, and a vertical rod is slidably mounted on the bracket. A pressure spring is installed between the vertical rod and the bracket. A driven rack is fixedly installed at one end of the vertical rod near the corresponding rotating wheel. The driven rack meshes with the corresponding driving tooth segment, so that when the limiting wheel is tightly fitted with the inner wall of the limiting groove, the driving tooth segment drives the driven rack to move. A drive rod is fixed to the end of the vertical rod away from the corresponding rotating wheel. A "V"-shaped sliding groove is opened inside the drive rod, and the roller is slidably installed inside the sliding groove.

[0018] The above technical solution enables the driven wheel to move through the drive gear segment to drive the driven rack to move when the driving wheel does not drive the intermittent wheel to rotate, thereby driving the drive rod to move and then applying force to the roller, causing the roller to slide vertically. When the movable frame needs to move in the reverse direction, the motor of the driving wheel is started in the reverse direction, which drives the driven rack to move in the reverse direction. Under the action of the "V" shaped sliding groove, the roller can still drive the extrusion rod to move and extrude towards the corresponding sealing end plate.

[0019] Furthermore, a triggering mechanism is installed between the support frame and the two movable frames. The triggering mechanism includes two fixed electrodes and two movable electrodes. The two fixed electrodes are fixed on the support frame, and the two movable electrodes are symmetrically installed on the two ends of the movable frames. The two fixed electrodes and the two movable electrodes are arranged in a one-to-one correspondence. When the movable electrode comes into contact with the corresponding fixed electrode, the indicator outside the ultraviolet disinfection cover is triggered to emit a prompt signal, reminding medical staff to replace the primary or secondary filter.

[0020] The above technical solution enables the active electrode to contact the fixed electrode when all filter elements except the working filter element have reached the end of their service life, triggering an alarm and realizing real-time monitoring of filter element life. This eliminates the need for manual memorization of replacement cycles and allows for online switching of backup filter elements without downtime.

[0021] Furthermore, the two movable frames are arranged perpendicular to each other, and the sliding directions of the two movable frames are perpendicular to each other.

[0022] The above technical solution makes it easy to remove the used filter cartridge.

[0023] 3. Beneficial effects: Compared with the prior art, the bacterial filtration device for medical vacuum negative pressure units of this invention, using the technical solution provided by this invention, realizes single-drive linkage switching and clamping mechanism through working module, can automatically switch filtration positions and seal the air path, and simultaneously trigger mechanism to monitor filter life, supporting online filter replacement without stopping the machine. Its specific contents are as follows: (1) This device uses a single drive mechanism to link two sets of working modules. The switching mechanism and the pressing mechanism can be driven to work by the rotation of the drive wheel. The switching mechanism achieves automatic switching of the filter element through gear and rack cooperation, without the need for manual pushing of the movable frame. Then, the drive tooth segment in the pressing mechanism meshes with the rack and the "V" shaped sliding groove cooperates with the roller to achieve automatic sealing connection and disconnection of the air path. There is no need for manual operation of the extrusion parts. When switching the filter position, the pipeline can be automatically sealed to prevent gas leakage, and the action is coordinated and reliable. (2) Triggering mechanisms are installed between the support frame and the two movable frames. The two fixed electrodes and the two movable electrodes are set one-to-one. The movable electrodes are installed on the two ends of the movable frame and matched with the station switching stroke of the filter element. When the movable frame drives the filter element to slide to the limit position, that is, when all filter elements except the working filter element have reached the service life, the movable electrode contacts the fixed electrode and triggers the alarm, realizing real-time monitoring of the filter element life. There is no need to manually remember the replacement cycle. At the same time, the spare filter element can be switched online without stopping the machine. (3) The device has two filter chambers at the upper and lower ends of the support frame. The upper movable frame is equipped with a primary filter element and the lower movable frame is equipped with a secondary filter element. After the filtered gas enters from the air inlet, it first passes through the primary filter element to filter out bacteria and impurities with larger particle size, and then passes through the secondary filter element to filter out bacteria and microorganisms with smaller particle size, forming a graded filtration system. It is then used in conjunction with an ultraviolet disinfection hood for secondary sterilization. The multi-stage treatment ensures the purification effect. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the support frame structure of the present invention; Figure 3 This is a schematic diagram of the movable frame structure of the present invention; Figure 4 This is a schematic cross-sectional view of the support frame structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This is a schematic diagram of the extrusion component structure of the present invention; Figure 7 This is a schematic diagram of the working module structure of the present invention; Figure 8 This is a schematic diagram of the clamping mechanism of the present invention; Figure 9 This is a schematic diagram of the overall structure of the present invention from another perspective.

[0025] In the diagram: 1. Support frame; 2. Air inlet; 3. Air outlet; 4. Connecting fittings; 41. Telescopic pipe; 42. Sealing end plate; 43. Sealing ring one; 44. Reset component; 441. Fixed cylinder; 442. Movable rod; 443. Reset spring; 5. Movable frame; 51. Mounting groove; 52. Sealing ring two; 6. Primary filter element; 7. Secondary filter element; 8. Drive mechanism; 81. Drive wheel; 811. Actuating lever; 812. Limiting wheel; 82. Intermittent wheel; 821. Actuating groove; 822. Limiting... 9. Slot; 10. Switching mechanism; 11. Driving gear; 12. Guide gear; 13. Driven gear; 14. Forced rack; 15. Pressing mechanism; 16. Rotary wheel; 17. Drive gear segment; 18. Support; 19. Vertical rod; 100. Pressure spring; 101. Driven rack; 102. Drive rod; 103. Sliding groove; 11. Extrusion piece; 111. Sliding frame; 112. Roller; 113. Extrusion rod; 12. Triggering mechanism; 121. Fixed electrode; 122. Movable electrode. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0027] Please see Figure 1-9 This invention provides a technical solution: a bacterial filtration device for a medical vacuum negative pressure unit, comprising a support frame 1 installed inside an ultraviolet disinfection hood, an air inlet 2 installed at the upper end of the support frame 1, and an air outlet 3 installed at the lower end of the support frame 1. Filter chambers are formed inside both the upper and lower ends of the support frame 1, and movable frames 5 are slidably installed inside each of the two filter chambers. Connecting pipes 4 are installed at both the upper and lower ends of each filter chamber, and each connecting pipe 4 is fitted with a squeezing member 11. The squeezing member 11 is used to drive the connecting pipe 4 to move and achieve airflow / disconnection. Primary filter elements 6 are installed at equal intervals inside the upper movable frame 5, and secondary filter elements 7 are installed at equal intervals inside the lower movable frame 5. The primary filter elements 6 and secondary filter elements 7 work together to achieve graded bacterial filtration. The two movable frames 5 are arranged perpendicularly to each other, and the sliding directions of the two movable frames 5 are perpendicular to each other. First, connect and seal the air outlet 3 of the device to the air inlet pipe of the medical vacuum negative pressure machine. After starting the medical vacuum negative pressure machine, the negative pressure it generates forms a stable airflow, allowing the air in the ward to be drawn into the device through the air inlet 2. After the air enters, it first flows through the primary filter 6 on the upper movable frame 5. The primary filter 6 efficiently filters out large particles such as dust, dander, and hair from the air. The filtered air then flows through the secondary filter 7 on the lower movable frame 5. The secondary filter 7 precisely filters out small particulate pollutants such as bacteria, droplets, and microorganisms. After two stages of filtration, clean and sterile air is smoothly delivered into the medical vacuum negative pressure machine through the air outlet 3. Two sets of working modules are installed on the side of the support frame 1, corresponding to the two movable frames 5. Each working module includes a drive mechanism 8, a switching mechanism 9, and a clamping mechanism 10. The output end of the drive mechanism 8 is connected to the switching mechanism 9 and the clamping mechanism 10 respectively to provide power. The drive mechanism 8 includes a drive wheel 81 and an intermittent wheel 82 mounted on the support frame 1 via bearings. A lever 811 is mounted on the drive wheel 81, and a limit wheel 812 is fixed on the drive wheel 81. The intermittent wheel 82 has staggered slots 821 and limit slots 822. When the drive wheel 81 rotates, the lever 811 extends into the slot 821 and drives the intermittent wheel 82 to rotate synchronously. When the lever 811 disengages from the slot 821, the limit wheel 812 engages with the limit... The inner wall of the groove 822 fits tightly, thus restricting the rotation of the intermittent wheel 82 under external force and achieving the positioning of the intermittent wheel 82; the switching mechanism 9 is connected to the movable frame 5 for transmission, and is used to drive the movable frame 5 to slide, so that the filter elements inside the movable frame 5 move sequentially to the ventilation position; the switching mechanism 9 includes a driving gear 91, a guide gear 92, two driven gears 93 and two force racks 94; the driving gear 91 is fixedly sleeved on the end of the intermittent wheel 82; the guide gear 92 and the two driven gears 93 are all mounted on the support frame 1 through bearings, and the guide gear 92 meshes with the driving gear 91 and the two driven gears 93 respectively; the two force racks 94 are installed on the upper and lower sides of the side of the movable frame 5, and the two force racks 94 mesh with the two driven gears 93 respectively; When the gas flow meter on the medical vacuum negative pressure machine detects that the flow rate is less than the preset threshold, the switching program is automatically triggered, the motor at the end of the drive wheel 81 is started, and the drive wheel 81 is driven to rotate. Through the engagement of the lever 811 with the slot 821 on the intermittent wheel 82, the drive wheel 81 drives the intermittent wheel 82 and the drive gear 91 fixedly sleeved at the end of the intermittent wheel 82 to rotate. The drive gear 91 drives two driven gears 93 to rotate synchronously in the same direction through the guide gear 92. The driven gears 93 mesh with the force rack 94 fixed on the side of the movable frame 5, thereby driving the movable frame 5 to slide in the filter chamber, so that the primary filter element 6 or the secondary filter element 7 moves sequentially between the two corresponding connecting pipes 4, realizing the switching of the filtration station; The clamping mechanism 10 is used to drive the extrusion member 11 to extrude the connecting pipe 4, thereby displacing the connecting pipe 4 to connect the air passage. The connecting pipe 4 includes a telescopic pipe 41 mounted on the support frame 1. A sealing end plate 42 is fixed at one end of the telescopic pipe 41 near the corresponding filter chamber. A sealing ring 43 is installed on the end face of the sealing end plate 42. A reset member 44 is connected between the sealing end plate 42 and the support frame 1. The reset member 44 includes a fixing cylinder 441 fixed on the support frame 1 and a cylinder fixedly mounted on the sealing end plate 42. The movable rod 442 is fitted inside the fixed cylinder 441, and a return spring 443 is connected between the fixed cylinder 441 and the movable rod 442; the extrusion member 11 includes a sliding frame 111 that is slidably mounted vertically on the support frame 1, a roller 112 that is rotatably mounted on the side of the sliding frame 111, and a plurality of extrusion rods 113 that are fixed on the side of the sliding frame 111 near the corresponding connecting pipe 4, the extrusion rods 113 being used to extrude the sealing end plate 42; the movable frame 5 has vertically penetrating openings at equal intervals. Mounting slot 51, inside which a mounting plate is installed, and a sealing ring 52 is installed on the upper end face of the mounting plate; the clamping mechanism 10 includes a rotating wheel 101 and two brackets 103; the rotating wheel 101 is fixedly mounted on the end of the driving wheel 81, and two sets of driving tooth segments 102 are symmetrically mounted on the outer wall of the rotating wheel 101; each bracket 103 is fixedly mounted on the support frame 1, and a vertical rod 104 is slidably mounted on the bracket 103, and a pressure spring 105 is installed between the vertical rod 104 and the bracket 103; the vertical rod A driven rack 106 is fixedly installed at one end of the vertical rod 104 near the corresponding rotating wheel 101. The driven rack 106 meshes with the corresponding driving gear segment 102, so that when the limiting wheel 812 is tightly fitted with the inner wall of the limiting groove 822, the driving gear segment 102 drives the driven rack 106 to move. A driving rod 107 is fixed at one end of the vertical rod 104 away from the corresponding rotating wheel 101. A "V"-shaped sliding groove 108 is opened inside the driving rod 107, and the roller 112 is slidably installed inside the sliding groove 108. While the drive mechanism 8 is in motion, the rotating wheel 101 fixed at the end of the drive wheel 81 rotates synchronously. When the lever 811 disengages from the lever groove 821, the limiting wheel 812 on the drive wheel 81 will fit tightly against the inner wall of the limiting groove 822 of the intermittent wheel 82, restricting the rotation of the intermittent wheel 82. At this time, the drive tooth segment 102 on the outer wall of the rotating wheel 101 meshes with the driven rack 106, pushing the vertical rod 104 to move laterally against the elastic force of the pressure spring 105. The drive rod 107 at the end of the vertical rod 104 drives the roller 112 and the sliding frame 111 to move vertically through the sliding groove 108, so that the extrusion rod 113 extrudes the sealing end plate 42. After the sealing end plate 42 is compressed, the sealing ring 43 fits tightly against the mounting groove 51 on the end of the filter element or the movable frame 5, realizing the sealed connection of the air passage. When the extrusion is released, the return spring 443 pushes the sealing end plate 42 to return to its original position, disconnecting the air passage. A triggering mechanism 12 is installed between the support frame 1 and the two movable frames 5. The triggering mechanism 12 includes two fixed electrodes 121 and two movable electrodes 122. The two fixed electrodes 121 are fixed on the support frame 1, and the two movable electrodes 122 are symmetrically installed on the two ends of the movable frames 5. The two fixed electrodes 121 and the two movable electrodes 122 are set in a one-to-one correspondence. When the movable electrode 122 contacts the corresponding fixed electrode 121, the indicator outside the ultraviolet disinfection cover is triggered to emit a prompt signal, reminding medical staff to replace the first-stage filter 6 or the second-stage filter 7. When the movable frame 5 slides to its limit position, that is, when all filter elements except the working filter element have exhausted their lifespan, the movable electrode 122 installed at the end of the movable frame 5 comes into contact with the fixed electrode 121 on the support frame 1, triggering the indicator outside the ultraviolet disinfection cover to remind medical staff to perform maintenance.

[0028] Working principle: When using the bacterial filtration device in this medical vacuum negative pressure unit, if... Figure 1-9 As shown, a medical vacuum negative pressure machine is first connected via a pipeline. After startup, air from the ward is drawn in through the air inlet 2. Large particles are first intercepted by the primary filter 6, and then small particulate pollutants such as bacteria and microorganisms are filtered by the secondary filter 7. The clean air is then discharged through the air outlet 3. When the negative pressure machine detects insufficient flow, the drive wheel 81 rotates, which, through the cooperation of the lever 811 and the slot 821, drives the intermittent wheel 82 and the drive gear 91 to rotate. Through the meshing of the guide gear 92, the driven gear 93 and the force rack 94, the movable frame 5 is driven to slide, switching the filtration position. Simultaneously, the drive wheel 81 drives the rotating wheel 101 to rotate, and the drive tooth segment 102 pushes the vertical rod 104 to move laterally. The drive rod 107 drives the extrusion rod 113 to extrude the sealing end plate 42 through the sliding groove 108, thereby achieving air circuit sealing and connection. After the extrusion is released, the reset spring 443 pushes the sealing end plate 42 to reset and disconnect the air circuit. When the movable frame 5 slides to the limit position, the movable electrode 122 contacts the fixed electrode 121, triggering the alarm and reminding the filter element to be replaced.

[0029] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 bacterial filtration device for a medical vacuum negative pressure unit, characterized in that: The device includes a support frame (1) installed inside the ultraviolet disinfection hood. The upper end of the support frame (1) is equipped with an air inlet (2), and the lower end of the support frame (1) is equipped with an air outlet (3). Both the upper and lower ends of the support frame (1) are provided with filter chambers. Movable frames (5) are slidably installed inside the two filter chambers. Both the upper and lower ends of each filter chamber are equipped with connecting pipes (4). Each connecting pipe (4) is equipped with a pressing component (11). The pressing component (11) is used to drive the connecting pipe (4) to move to realize the opening and closing of the air passage. The upper movable frame (5) is equipped with a primary filter element (6) at equal intervals inside, and the lower movable frame (5) is equipped with a secondary filter element (7) at equal intervals inside. The primary filter element (6) and the secondary filter element (7) work together to achieve graded filtration of bacteria. Two sets of working modules are installed on the side of the support frame (1). The two sets of working modules are correspondingly arranged with two movable frames (5). The working modules include a drive mechanism (8), a switching mechanism (9) and a pressing mechanism (10). The output end of the drive mechanism (8) is connected to the switching mechanism (9) and the pressing mechanism (10) respectively to provide power; The switching mechanism (9) is connected to the movable frame (5) for driving the movable frame (5) to slide, so that the filter element inside the movable frame (5) moves to the ventilation station in sequence; The pressing mechanism (10) is used to drive the extrusion component (11) to press the connecting pipe (4), so that the connecting pipe (4) can be displaced to realize the connection of the air passage.

2. The bacterial filtration device for a medical vacuum negative pressure unit according to claim 1, characterized in that: The connecting pipe (4) includes a telescopic pipe (41) installed on the support frame (1). A sealing end plate (42) is fixed at one end of the telescopic pipe (41) near the corresponding filter chamber. A sealing ring (43) is installed on the end face of the sealing end plate (42). A reset member (44) is connected between the sealing end plate (42) and the support frame (1). The reset component (44) includes a fixed cylinder (441) fixed on the support frame (1) and a movable rod (442) fixed on the sealing end plate (42). The movable rod (442) is fitted inside the fixed cylinder (441), and a reset spring (443) is connected between the fixed cylinder (441) and the movable rod (442).

3. The bacterial filtration device for a medical vacuum negative pressure unit according to claim 2, characterized in that: The extrusion member (11) includes a sliding frame (111) that is slidably mounted on the support frame (1) in a vertical direction. Rollers (112) are rotatably mounted on the side of the sliding frame (111). Multiple extrusion rods (113) are fixed on the side of the sliding frame (111) near the corresponding connecting pipe (4). The extrusion rods (113) are used to extrude the sealing end plate (42).

4. A bacterial filtration device for a medical vacuum negative pressure unit according to claim 1, characterized in that: The movable frame (5) has mounting slots (51) that extend vertically through it at equal intervals. A mounting plate is installed inside the mounting slot (51), and a sealing ring (52) is installed on the upper surface of the mounting plate.

5. A bacterial filtration device for a medical vacuum negative pressure unit according to claim 1, characterized in that: The drive mechanism (8) includes a drive wheel (81) and an intermittent wheel (82) mounted on the support frame (1) via bearings. A lever (811) is installed on the drive wheel (81), and a limit wheel (812) is fixed on the drive wheel (81). The intermittent wheel (82) is provided with staggered grooves (821) and limiting grooves (822); When the drive wheel (81) rotates, the lever (811) extends into the groove (821) and drives the intermittent wheel (82) to rotate synchronously; when the lever (811) disengages from the groove (821), the limiting wheel (812) fits tightly against the inner wall of the limiting groove (822), thereby restricting the intermittent wheel (82) from rotating under external force and realizing the positioning of the intermittent wheel (82).

6. A bacterial filtration device for a medical vacuum negative pressure unit according to claim 5, characterized in that: The switching mechanism (9) includes a driving gear (91), a guide gear (92), two driven gears (93) and two force-bearing racks (94). The drive gear (91) is fixedly sleeved on the end of the intermittent gear (82); The guide gear (92) and the two driven gears (93) are all mounted on the support frame (1) by bearings, and the guide gear (92) meshes with the driving gear (91) and the two driven gears (93) respectively; The two force-bearing racks (94) are installed on the upper and lower sides of the movable frame (5), and the two force-bearing racks (94) are respectively engaged with the two driven gears (93).

7. A bacterial filtration device for a medical vacuum negative pressure unit according to claim 5, characterized in that: The clamping mechanism (10) includes a rotating wheel (101) and two supports (103). The rotating wheel (101) is fixedly installed on the end of the driving wheel (81), and two sets of driving tooth segments (102) are symmetrically installed on the outer wall of the rotating wheel (101). Each of the brackets (103) is fixedly installed on the support frame (1), and a vertical rod (104) is slidably installed on the bracket (103). A pressure spring (105) is installed between the vertical rod (104) and the bracket (103). A driven rack (106) is fixedly installed at one end of the vertical rod (104) near the corresponding rotating wheel (101). The driven rack (106) meshes with the corresponding driving tooth segment (102), so that when the limiting wheel (812) is tightly fitted with the inner wall of the limiting groove (822), the driving tooth segment (102) drives the driven rack (106) to move. A drive rod (107) is fixed at one end of the vertical rod (104) away from the corresponding rotating wheel (101). A "V"-shaped sliding groove (108) is provided inside the drive rod (107), and the roller (112) is slidably installed inside the sliding groove (108).

8. A bacterial filtration device for a medical vacuum negative pressure unit according to claim 1, characterized in that: Triggering mechanisms (12) are installed between the support frame (1) and the two movable frames (5). The triggering mechanism (12) includes two fixed electrodes (121) and two movable electrodes (122). The two fixed electrodes (121) are fixed on the support frame (1), and the two movable electrodes (122) are symmetrically installed on the two ends of the movable frame (5). The two fixed electrodes (121) and the two movable electrodes (122) are set in a one-to-one correspondence. When the movable electrode (122) contacts the corresponding fixed electrode (121), the indicator outside the ultraviolet disinfection cover is triggered to issue a prompt signal, reminding medical staff to replace the primary filter (6) or the secondary filter (7).

9. A bacterial filtration device for a medical vacuum negative pressure unit according to claim 1, characterized in that: The two movable frames (5) are arranged perpendicular to each other, and the sliding directions of the two movable frames (5) are perpendicular to each other.

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