Device and method for improving VHP sterilization vaporized hydrogen peroxide concentration of isolator

Abstract

The invention relates to the technical field of isolators, and discloses a device and method for improving the VHP sterilization vaporized hydrogen peroxide concentration of an isolator, and the device comprises a sterilization mechanism, a gas inlet mechanism and a gas return mechanism; the sterilization mechanism comprises an operation cabin and a delivery cabin which are integrally mounted, a first air-tight door and a second air-tight door which are mounted in a switch mode are respectively arranged on the operation cabin and the delivery cabin, and a temperature and humidity sensor, a concentration sensor and a pressure difference transmitter are respectively mounted in the position, above the first air-tight door, of the operation cabin. According to the device and the method for improving the VHP sterilization vaporized hydrogen peroxide concentration of the isolator, the problems that as the sterilization process is carried out, the humidity in the isolator is gradually increased, when the humidity in the isolator is at a higher level, the condensation of vaporized hydrogen peroxide is accelerated and far exceeds a trace condensation state, and the vaporized hydrogen peroxide is decomposed into water and oxygen; further, the concentration of vaporized hydrogen peroxide in the isolator cabin body is influenced, and adverse effects on the killing effect are generated.

Description

Technical Field

[0001] The invention relates to the technical field of isolators, and in particular to a device and method for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in isolators. Background Art

[0002] An isolator is a device used for sterilization in the pharmaceutical industry, more than 90% of which are "sterilized" using vaporized hydrogen peroxide (VHP). After decomposition, hydrogen peroxide turns into only water and oxygen, which is more environmentally friendly and safer than formaldehyde, ozone and other disinfection methods. Therefore, it is currently also widely used in the disinfection of clean rooms, laboratories and other large environments.

[0003] The basic principle of the current sterilization system is to send the hydrogen peroxide solution to the evaporation tray of the isolator, heat it through the evaporation tray and evaporate it into vaporized hydrogen peroxide, which is then circulated inside the isolator cabin, fully contacting the surface of the sterilized environment within a verified time, so that the hydrogen peroxide forms a trace amount of condensation on the surface, thereby quickly killing the microorganisms on the surface.

[0004] The current technical problem is that as the hydrogen peroxide solution evaporates in the evaporating disk, a large amount of water vapor is also produced while producing vaporized hydrogen peroxide. As the sterilization process proceeds, the humidity in the isolator gradually rises. When the humidity in the isolator is at a high level, it will accelerate the condensation of vaporized hydrogen peroxide, far exceeding the state of trace condensation, and decompose into water and oxygen, thereby affecting the concentration of vaporized hydrogen peroxide in the isolator cabin and having an adverse effect on the killing efficacy. Summary of the invention

[0005] In view of the shortcomings of the prior art, the invention provides a device and method for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator, which solves the problems mentioned in the above background.

[0006] The invention provides the following technical solutions: a device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator, comprising: a sterilization mechanism, an air intake mechanism and an air return mechanism;

[0007] The sterilization mechanism comprises an integrally installed operation cabin and a delivery cabin, the operation cabin and the delivery cabin are respectively provided with a first closed door and a second closed door which are open and close, the interior of the operation cabin located above the first closed door is respectively provided with a temperature and humidity sensor, a concentration sensor and a differential pressure transmitter, the displays of the temperature and humidity sensor, the concentration sensor and the differential pressure transmitter are all passed through the front wall of the operation cabin and sealed therewith, an evaporation mechanism is arranged inside the operation cabin near the side, two through slots are through-opened on the partition between the operation cabin and the delivery cabin, and the two through slots are respectively provided with a delivery mechanism and an air duct cover, a storage table is set up in the through slot located just above the air duct cover inside the operation cabin, and a support foot is installed at the bottom of the delivery cabin;

[0008] The air intake mechanism includes an air supply mechanism installed on the top of the operating cabin, the top of the air supply mechanism is connected to the air return mechanism and an air drying mechanism is installed on the side thereof, and the end of the air drying mechanism away from the air supply mechanism is connected to sterile dry compressed air;

[0009] The return air mechanism includes a return air hood installed on the side of the operating cabin, the side surface of the return air hood close to the bottom end and the air guide hood are installed through the end of the delivery cabin, and the bottom of the return air hood is connected to the interior of the delivery cabin through the installation of an air guide pipe, and the return air hood is equipped with a waste filter mechanism and a return air pipe in sequence along the gas flow direction, and a pressure relief valve is installed on the top of the waste filter mechanism.

[0010] Preferably, the air drying mechanism includes a throttle valve, the air outlet end of the throttle valve is installed on the air inlet on the side of the air supply mechanism, the air inlet end of the throttle valve is installed in series with a shut-off valve, a flow meter and a pressure regulating valve through pipelines in sequence along the reverse flow direction of the gas, the air inlet end of the pressure regulating valve is installed with a three-way pipe through the pipeline, and a pressure transmitter and a main switch manual valve are installed on the other two interfaces of the three-way pipe through pipelines respectively, and the air inlet of the main switch manual valve is connected to sterile dry compressed air.

[0011] Preferably, the waste filtering mechanism comprises a waste filtering cover, a second high efficiency filter is installed at the bottom of the inner wall of the waste filtering cover, a second axial flow fan is installed on the side of the inner wall of the waste filtering cover, and the position of the second axial flow fan corresponds to the position of the return air duct.

[0012] Preferably, the air supply mechanism includes an air guide shell, the air drying mechanism is installed on the side of the air guide shell, the return air duct is installed on the top of the air guide shell, a static pressure box is arranged at the center of the interior of the air guide shell, the air guide shell and the static pressure box are both sealed and installed on the top of the operating cabin, a first axial flow fan is installed between the top of the static pressure box and the air guide shell, and the position of the first axial flow fan corresponds to the position of the return air duct outlet.

[0013] Preferably, the front and rear sides of the static pressure box are connected with air inlet channels, and a first high-efficiency filter is installed in the air inlet channel of the static pressure box. The four corners of the bottom of the static pressure box extend downward into the operating cabin and are equipped with air guide plates.

[0014] Preferably, a steam pipe is installed in a through-type manner on the side of the static pressure box, and one end of the steam pipe away from the static pressure box passes through the air guide shell and is installed on the evaporation mechanism arranged in the operating cabin.

[0015] Preferably, the delivery mechanism includes a delivery platform, which is located inside the delivery cabin, with sliding rods installed at the four corners of the delivery platform, a top pressure plate installed on the top of the sliding rod, a placing platform provided on the top pressure plate, an internal threaded sleeve integrally provided on one side of the delivery platform, the internal threaded sleeve of the internal threaded sleeve is provided with a screw rod, the top of the screw rod is rotatably set in the delivery cabin through a bearing, and the bottom of the screw rod passes through the delivery cabin and is assembled with the motor output shaft installed at the bottom of the delivery cabin.

[0016] Preferably, the slide bar is slidably arranged on the partition between the operation cabin and the delivery cabin, and rubber rings are arranged on the outer edge of the upper surface of the delivery platform and the outer edge of the lower surface of the top pressure plate.

[0017] Preferably, the storage table comprises a sterilization plate, one side of the sterilization plate is machined to have a side guide shell, a side surface of the side guide shell is provided with a flow hole, and the ventilation direction of the flow hole is aligned with the delivery mechanism.

[0018] A method for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator, comprising the following steps:

[0019] S1, place the sterilized items in the operation cabin, connect the sterile dry compressed air to the air drying mechanism, and operate the isolator;

[0020] S2, after the vaporized hydrogen peroxide enters the operating cabin, the temperature and humidity sensor, concentration sensor, and differential pressure transmitter begin to monitor the temperature and humidity levels in the isolator cabin, the vaporized hydrogen peroxide concentration, and the pressure difference relative to the background environment;

[0021] S3, when the humidity in the operating cabin is too high and the concentration of vaporized hydrogen peroxide decreases, the air drying mechanism is controlled to inject a certain amount of sterile dry compressed air into the air supply mechanism, and the circulating return air is mixed with the sterile dry compressed air in the air supply mechanism to reduce the humidity in the operating cabin;

[0022] S4, with the injection of sterile dry compressed air, the pressure in the isolator cabin will rise, and the pressure relief valve will be intermittently opened or closed to maintain the pressure in the isolator cabin within the set range.

[0023] Compared with the prior art, the invention has the following beneficial effects:

[0024] 1. The device and method for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator, by providing an air drying mechanism, injecting sterile dry compressed air into the isolator, and using an air supply mechanism to mix the filtered airflow containing water vapor after the return air with the sterile dry compressed air, thereby reducing the humidity in the isolator during VHP sterilization, avoiding the condensation of vaporized hydrogen peroxide exceeding a trace condensation, and thus achieving the effect of controlling the concentration of vaporized hydrogen peroxide in the isolator cabin, increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in the isolator, and ensuring the VHP sterilization effectiveness.

[0025] 2. The device and method for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in the isolator, by setting up a delivery mechanism, controlling the raising and lowering of the delivery mechanism during the sterilization process of the isolator, can place sterilized items into the delivery mechanism according to the difference in sterilization time of the sterilized objects, and isolate the delivery cabin by blocking the through slot after the delivery mechanism descends, so that the items in the sterilization process can be taken out directly without waiting for all items to be sterilized before taking them out together. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the invention;

[0027] Figure 2 It is a side view schematic diagram of the structure of the invention;

[0028] Figure 3 This is a schematic diagram of the cross-sectional structure of the invented operating cabin;

[0029] Figure 4 The figure is a schematic diagram of the cross-sectional structure of the invented air supply mechanism;

[0030] Figure 5 For invention Figure 4 The enlarged structural diagram at A in the middle;

[0031] Figure 6 A schematic diagram of the disassembled structure of the invented delivery mechanism;

[0032] Figure 7 The present invention is a schematic diagram of the storage table structure;

[0033] Figure 8 This is a schematic diagram of the disassembled structure of the invented air supply mechanism.

[0034] In the figure: 1. Operation cabin; 2. Delivery cabin; 3. Air supply mechanism; 31. Air guide shell; 32. Static pressure box; 33. First axial flow fan; 34. First high efficiency filter; 35. Steam pipe; 36. Air guide plate; 4. Air drying mechanism; 41. Throttle valve; 42. Shut-off valve; 43. Flow meter; 44. Pressure regulating valve; 45. Three-way pipe; 46. Pressure transmitter; 47. Main switch manual valve; 5. Return air cover; 6. Waste filter mechanism; 61. Waste filter cover; 62. Second axial flow fan; 63. Second high efficiency filter; 7. Pressure relief valve; 8. Return air duct; 9. First closed door; 10. Evaporation mechanism; 11. Temperature and humidity sensor; 12. Concentration sensor; 13. Pressure differential transmitter; 14. Second closed door; 15. Support leg; 16. Delivery mechanism; 161. Delivery platform; 162. Slide rod; 163. Top pressure plate; 164. Placement platform; 165. Internal threaded sleeve; 166. Screw rod; 167. Motor; 17. Air guide hood; 18. Storage platform; 181. Sterilization plate; 182. Side guide shell; 183. Flow hole; 19. Air guide duct. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the invention.

[0036] See also Figure 1-8 , a device and method for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator, comprising: a sterilization mechanism, an air intake mechanism and an air return mechanism;

[0037] The sterilization mechanism includes an integrally installed operation cabin 1 and a delivery cabin 2, and the operation cabin 1 and the delivery cabin 2 are respectively provided with a first sealed door 9 and a second sealed door 14 installed in a switchable manner, and the interior of the operation cabin 1 located above the first sealed door 9 is respectively installed with a temperature and humidity sensor 11, a concentration sensor 12 and a differential pressure transmitter 13, and the displays of the temperature and humidity sensor 11, the concentration sensor 12 and the differential pressure transmitter 13 all pass through the front wall of the operation cabin 1 and are sealed therewith, and an evaporation mechanism 10 is arranged inside the operation cabin 1 near the side, and two through grooves are through-typely opened on the partition between the operation cabin 1 and the delivery cabin 2, and a delivery mechanism 16 and an air guide hood 17 are respectively arranged on the two through grooves, and a storage table 18 is set up in the through groove located directly above the air guide hood 17 in the operation cabin 1, and a support foot 15 is installed at the bottom of the delivery cabin 2, wherein the temperature and humidity sensor 11 can adopt the common commercially available The concentration sensor 12 can be a model suitable for hydrogen peroxide environment, such as B12-34-7-2000-1C, TEC-H2O2 gas detection probe and Dräger hydrogen peroxide gas sensor HC6809675, which are common models on the market;

[0038] The air intake mechanism includes an air supply mechanism 3 installed on the top of the operating cabin 1, the top of the air supply mechanism 3 is connected to the air return mechanism and an air drying mechanism 4 is installed on the side thereof, and the end of the air drying mechanism 4 away from the air supply mechanism 3 is connected to sterile dry compressed air;

[0039] The air return mechanism includes a return air hood 5 installed on the side of the operating cabin 1. The side surface of the return air hood 5 near the bottom end and the air guide hood 17 are installed through the end of the delivery cabin 2, and the bottom of the return air hood 5 is connected with the interior of the delivery cabin 2 by installing an air guide pipe 19. The return air hood 5 is equipped with a waste filter mechanism 6 and a return air pipe 8 in sequence along the gas flow direction. A pressure relief valve 7 is installed on the top of the waste filter mechanism 6. The pressure relief valve 7 adopts an electric valve. When the isolator is sterilized, as compressed air is injected, the pressure in the cabin will rise. The pressure relief valve 7 is intermittently opened or closed to maintain the pressure in the cabin within a set range.

[0040] The air drying mechanism 4 includes a throttle valve 41, the outlet end of the throttle valve 41 is installed on the air inlet on the side of the air supply mechanism 3, the air inlet end of the throttle valve 41 is sequentially installed with a shut-off valve 42, a flow meter 43 and a pressure regulating valve 44 in series through a pipeline along the reverse flow direction of the gas, the air inlet end of the pressure regulating valve 44 is installed with a three-way pipe 45 through a pipeline, and the other two interfaces of the three-way pipe 45 are respectively installed with a pressure transmitter 46 and a main switch manual valve 47 through pipelines, and the air inlet of the main switch manual valve 47 is connected to sterile dry compressed air;

[0041] In addition, the main switch manual valve 47 adopts a manual valve, which is used to open and close the main gas source. It is normally open under normal conditions and closed during gas line maintenance;

[0042] The pressure transmitter 46 may be a pressure transmitter 46 without a display, which is used to monitor the pressure of the gas supply source;

[0043] The pressure regulating valve 44 may be a filter pressure regulating valve 44, which is used to adjust the gas line pressure and provide suitable pressure for subsequent components;

[0044] The flow meter 43 may be a flow sensor for monitoring the amount of compressed air injected into the isolator;

[0045] The shut-off valve 42 may be an electric valve, which is used to open and close the compressed air injection, and is automatically opened when the sterilization program of the isolator runs to the sterilization stage;

[0046] The throttle valve 41 may be a throttle valve 41 with adjustable gear positions, and is used to adjust the amount of compressed air injected into the isolator.

[0047] Among them, the waste filtering mechanism 6 includes a waste filtering cover 61, a second high-efficiency filter 63 is installed at the bottom of the inner wall of the waste filtering cover 61, and a second axial flow fan 62 is installed on the side of the inner wall of the waste filtering cover 61. The position of the second axial flow fan 62 corresponds to the position of the return air duct 8. As the return air is guided into the waste filtering mechanism 6 through the return air cover 5, the second high-efficiency filter 63 will directly filter the return air, so that the air in the isolator can self-circulate.

[0048] Among them, the air supply mechanism 3 includes an air guide shell 31, the air drying mechanism 4 is installed on the side of the air guide shell 31, the return air duct 8 is installed on the top of the air guide shell 31, and a static pressure box 32 is arranged at the center of the inside of the air guide shell 31. The air guide shell 31 and the static pressure box 32 are both sealed and installed on the top of the operating cabin 1. A first axial flow fan 33 is installed between the top of the static pressure box 32 and the air guide shell 31, and the position of the first axial flow fan 33 corresponds to the position of the air outlet of the return air duct 8. The air drying mechanism 4 is used to introduce sterile dry compressed air into the air guide shell 31, so that the sterile dry compressed air is mixed with the return circulating wind, thereby reducing the humidity in the circulating air and avoiding excessive condensation and decomposition of hydrogen peroxide into water and oxygen.

[0049] Among them, the front and rear sides of the static pressure box 32 are connected with air inlet channels, and a first high-efficiency filter 34 is installed in the air inlet channel of the static pressure box 32. The four corners of the bottom of the static pressure box 32 extend downward into the interior of the operating cabin 1 and are installed with air guide plates 36. By installing the first high-efficiency filter 34, the sterile dry compressed air is filtered first to remove impurities before it is mixed with the reflux circulating air.

[0050] Among them, a steam pipe 35 is installed on the side of the static pressure box 32. The end of the steam pipe 35 away from the static pressure box 32 passes through the air guide shell 31 and is installed on the evaporation mechanism 10 arranged in the operation cabin 1. The air outlet of the steam pipe 35 is located below the first axial flow fan 33, and can be directly blown by the first axial flow fan 33, and mixed with the return air and sterile dry compressed air that synchronously enters the static pressure box 32 to form a sterilizing gas that blows downward.

[0051] Among them, the delivery mechanism 16 includes a delivery platform 161, which is located inside the delivery cabin 2. Slide rods 162 are installed at the four corners of the delivery platform 161, and a top pressure plate 163 is installed on the top of the slide rod 162. A placing platform 164 is arranged on the top pressure plate 163. An internal threaded sleeve 165 is integrally arranged on one side of the delivery platform 161. The internal threaded sleeve of the internal threaded sleeve 165 is provided with a screw rod 166. The top of the screw rod 166 is rotatably arranged in the delivery cabin 2 through a bearing, and the bottom of the screw rod 166 passes through the delivery cabin 2 and is assembled with the output shaft of a motor 167 installed at the bottom of the delivery cabin 2. By utilizing the lifting ability of the delivery mechanism 16, the sterilized items can also be directly delivered to the operation cabin 1 from the bottom without opening the first sealed door 9 to cause the operation cabin 1 to be completely exposed to the outside air.

[0052] Among them, the sliding rod 162 is slidably arranged on the partition between the operation cabin 1 and the delivery cabin 2. Rubber rings are provided on the outer edge of the upper surface of the delivery platform 161 and the outer edge of the lower surface of the top pressure plate 163. The delivery mechanism 16 can be pressed on the partition by the delivery platform 161 and the top pressure plate 163 when it rises and falls, respectively, so as to achieve the effect of isolating the operation cabin 1 from the delivery cabin 2. When the delivery mechanism 16 rises, the gas in the operation cabin 1 will enter the delivery cabin 2 through the through groove, and then push the gas in the delivery cabin 2 into the return air hood 5, so as to prevent the air in the delivery cabin 2 from entering the operation cabin 1 and affecting the sterilization effect.

[0053] Among them, the placement table 18 includes a sterilization plate 181, and one side of the sterilization plate 181 is processed to have a side guide shell 182. The side of the side guide shell 182 is provided with a flow hole 183. The ventilation direction of the flow hole 183 is aligned with the delivery mechanism 16. When sterilization is performed, the top pressure plate 163 of the delivery mechanism 16 is pressed against the partition. If sterilized items are placed on the placement table 164, the wind passing through the sterilized items thereon will directly enter the air guide hood 17 through the flow hole 183, thereby preventing the wind passing through the sterilized items on the placement table 164 from blowing onto the sterilization plate 181.

[0054] A method for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator, comprising the following steps:

[0055] S1, place the sterilized items in the operation cabin 1, then connect the sterile dry compressed air to the air drying mechanism 4, and operate the isolator;

[0056] S2, after the vaporized hydrogen peroxide enters the operating cabin 1, the temperature and humidity sensor 11, the concentration sensor 12, and the differential pressure transmitter 13 respectively begin to monitor the temperature and humidity levels in the isolator cabin, the vaporized hydrogen peroxide concentration, and the pressure difference relative to the background environment;

[0057] S3, when the humidity in the operating cabin 1 is too high and the concentration of vaporized hydrogen peroxide decreases, the air drying mechanism 4 is controlled to inject a certain amount of sterile dry compressed air into the air supply mechanism 3, and the circulating return air is mixed with the sterile dry compressed air in the air supply mechanism 3 to reduce the humidity in the operating cabin 1;

[0058] S4, with the injection of sterile dry compressed air, the pressure in the isolator cabin will rise, and the pressure in the isolator cabin will be maintained within the set range by intermittently opening or closing the pressure relief valve 7.

[0059] Although embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator, characterized in that: include: Sterilization mechanism, air intake mechanism and air return mechanism; The sterilization mechanism comprises an integrally mounted operation cabin (1) and a delivery cabin (2), wherein the operation cabin (1) and the delivery cabin (2) are respectively provided with a first sealed door (9) and a second sealed door (14) which are switchably mounted, wherein a temperature and humidity sensor (11), a concentration sensor (12) and a differential pressure transmitter (13) are respectively installed in the interior of the operation cabin (1) above the first sealed door (9), and displays of the temperature and humidity sensor (11), the concentration sensor (12) and the differential pressure transmitter (13) are Both penetrate the front wall of the operating cabin (1) and are sealed therewith; an evaporation mechanism (10) is arranged inside the operating cabin (1) near the side; two through slots are arranged through the partition between the operating cabin (1) and the delivery cabin (2); and a delivery mechanism (16) and an air guide cover (17) are arranged on the two through slots respectively; a storage table (18) is arranged in the through slot located directly above the air guide cover (17) inside the operating cabin (1); and a support foot (15) is installed at the bottom of the delivery cabin (2); The air intake mechanism comprises an air supply mechanism (3) installed on the top of the operating cabin (1), the top of the air supply mechanism (3) is connected to the air return mechanism and an air drying mechanism (4) is installed on the side thereof, and the end of the air drying mechanism (4) away from the air supply mechanism (3) is connected to sterile dry compressed air; The air return mechanism comprises an air return cover (5) installed on the side of the operating cabin (1), the side surface of the air return cover (5) close to the bottom end and the air guide cover (17) are installed through the end of the delivery cabin (2), and the bottom of the air return cover (5) is connected to the inside of the delivery cabin (2) by installing an air guide pipe (19), and the air return cover (5) is equipped with a waste filter mechanism (6) and a return air pipe (8) in sequence along the direction of gas flow, and a pressure relief valve (7) is installed on the top of the waste filter mechanism (6).

2. A device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator according to claim 1, characterized in that: The air drying mechanism (4) comprises a throttle valve (41), the air outlet end of the throttle valve (41) is mounted on the air inlet on the side of the air supply mechanism (3), the air inlet end of the throttle valve (41) is serially mounted with a shut-off valve (42), a flow meter (43) and a pressure regulating valve (44) in sequence through a pipeline along the reverse flow direction of the gas, the air inlet end of the pressure regulating valve (44) is mounted with a three-way pipe (45) through a pipeline, and a pressure transmitter (46) and a main switch manual valve (47) are respectively mounted on the other two interfaces of the three-way pipe (45) through pipelines, and the air inlet of the main switch manual valve (47) is connected to sterile dry compressed air.

3. A device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator according to claim 1, characterized in that: The waste filtering mechanism (6) comprises a waste filtering cover (61), a second high-efficiency filter (63) is installed at the bottom of the inner wall of the waste filtering cover (61), and a second axial flow fan (62) is installed on the side of the inner wall of the waste filtering cover (61), and the position of the second axial flow fan (62) corresponds to the position of the return air duct (8).

4. A device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator according to claim 1, characterized in that: The air supply mechanism (3) comprises an air guide shell (31), the air drying mechanism (4) is installed on the side of the air guide shell (31), the return air duct (8) is installed on the top of the air guide shell (31), a static pressure box (32) is arranged at the center of the inside of the air guide shell (31), the air guide shell (31) and the static pressure box (32) are both sealed and installed on the top of the operating cabin (1), a first axial flow fan (33) is installed between the top of the static pressure box (32) and the air guide shell (31), and the position of the first axial flow fan (33) corresponds to the position of the air outlet of the return air duct (8).

5. A device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator according to claim 4, characterized in that: The front and rear sides of the static pressure box (32) are connected with air inlet channels, and a first high-efficiency filter (34) is installed in the air inlet channel of the static pressure box (32). The four corners of the bottom of the static pressure box (32) extend downward into the interior of the operating cabin (1) and are equipped with air guide plates (36).

6. A device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator according to claim 4, characterized in that: A steam pipe (35) is installed in a through-type manner on the side of the static pressure box (32); one end of the steam pipe (35) away from the static pressure box (32) passes through the air guide shell (31) and is installed on an evaporation mechanism (10) arranged in the operating cabin (1).

7. A device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator according to claim 1, characterized in that: The delivery mechanism (16) comprises a delivery platform (161), the delivery platform (161) is located inside the delivery cabin (2), sliding rods (162) are installed at the four corners of the delivery platform (161), a top pressure plate (163) is installed on the top of the sliding rod (162), a placement platform (164) is arranged on the top pressure plate (163), an internal threaded sleeve (165) is integrally arranged on one side of the delivery platform (161), the internal threaded sleeve of the internal threaded sleeve (165) is provided with a screw rod (166), the top of the screw rod (166) is rotatably arranged in the delivery cabin (2) through a bearing, and the bottom of the screw rod (166) passes through the delivery cabin (2) and is assembled with the output shaft of a motor (167) installed at the bottom of the delivery cabin (2).

8. A device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator according to claim 7, characterized in that: The slide bar (162) is slidably arranged on the partition between the operation cabin (1) and the delivery cabin (2), and rubber rings are arranged at the outer edge of the upper surface of the delivery platform (161) and the outer edge of the lower surface of the top pressure plate (163).

9. The device for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator according to claim 1, characterized in that: The storage table (18) includes a sterilization plate (181), one side of which is machined to have a side guide shell (182), a side of which is provided with a flow hole (183), and the ventilation direction of the flow hole (183) is aligned with the delivery mechanism (16).

10. A method for increasing the concentration of vaporized hydrogen peroxide for VHP sterilization in an isolator, characterized in that: The following steps are involved: S1, placing the sterilized items in the operation cabin (1), then connecting sterile dry compressed air to the air drying mechanism (4), and operating the isolator; S2, after the vaporized hydrogen peroxide enters the operating cabin (1), the temperature and humidity sensor (11), the concentration sensor (12), and the differential pressure transmitter (13) respectively begin to monitor the temperature and humidity levels in the isolator cabin, the vaporized hydrogen peroxide concentration, and the pressure difference relative to the background environment; S3, when the humidity in the operating cabin (1) is too high and the concentration of vaporized hydrogen peroxide decreases, the air drying mechanism (4) is controlled to inject a certain amount of sterile dry compressed air into the air supply mechanism (3), and the circulating return air is mixed with the sterile dry compressed air in the air supply mechanism (3) to reduce the humidity in the operating cabin (1); S4, with the injection of sterile dry compressed air, the pressure in the isolator cabin will rise, and the pressure in the isolator cabin will be maintained within the set range by intermittently opening or closing the pressure relief valve (7).

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