Double-sterilization internal circulation sterile isolator

Abstract

The utility model relates to a double-sterilization internal circulation sterile isolator which comprises a main cabin, a vaporized hydrogen peroxide generator (arranged above a high-efficiency filter), a laminar flow fan, the high-efficiency filter, an air return wall, an atomized hydrogen peroxide generator (arranged below the high-efficiency filter), an internal circulation catalytic decomposer, an air inlet fan and the like. And components such as an external discharge pressure-maintaining catalytic decomposer and an external discharge pressure-maintaining catalytic decomposer are also arranged. The two hydrogen peroxide generators are utilized to realize double sterilization, and the internal circulation catalytic decomposer is used for internal circulation residue discharge, so that the replacement rate is improved. The temperature, saturation and other parameters are monitored and controlled through the sensor, the sterilization effect is ensured, and the environment in the main chamber is stable. The isolator solves the problems that an existing isolator is low in sterilization efficiency, long in residue discharging time, high in requirement for fresh air volume, large in energy consumption and the like, and is widely applied to the fields such as medical treatment and pharmacy which have high requirements for the sterile environment.

Description

Technical Field

[0001] The utility model relates to a sterile isolator, in particular to a double-sterilization internal circulation sterile isolator. Background Art

[0002] In many fields such as modern medicine, pharmaceuticals, and biological experiments, the protection of a sterile environment is crucial, and sterile isolators have emerged as the times require. However, the sterilization methods of isolators in the existing technology have many shortcomings.

[0003] First, in terms of the way hydrogen peroxide gas enters most existing isolators, it mainly enters from above the high-efficiency filter. This method causes hydrogen peroxide gas to be easily adsorbed by the high-efficiency filter, which in turn causes the concentration in the main chamber to rise slowly and the residual discharge time to be short, ultimately extending the sterilization cycle and seriously affecting work efficiency.

[0004] Second, some isolators use a temperature-increasing sterilization method, and their hydrogen peroxide generators use a flash sterilization method. While this method has some sterilization effectiveness, it accelerates the decomposition of hydrogen peroxide gas. Furthermore, the resulting temperature difference within the main chamber limits the saturation level, preventing it from being set too high. This reduces sterilization efficiency, inevitably prolongs sterilization time, and increases energy consumption.

[0005] Third, existing isolators generally have high requirements for room fresh air volume, which greatly limits the applicability of the equipment. Not all customer locations can meet its requirements. In addition, the higher fresh air volume demand also means high energy consumption for customers, increasing the cost of use.

[0006] Therefore, there is an urgent need for a new type of sterile isolator to overcome the above problems and meet the needs of various fields for efficient, energy-saving and adaptable sterile environment equipment. Utility Model Content

[0007] The purpose of the utility model is to provide a double sterilization internal circulation aseptic isolator in order to solve the above problems existing in the prior art.

[0008] In order to achieve the above application objectives, the present invention adopts the following technical solutions: a dual sterilization internal circulation aseptic isolator includes a main cabin, and also includes:

[0009] A vaporized hydrogen peroxide generator is located at the air inlet of the high-efficiency filter and is used to vaporize and generate hydrogen peroxide gas;

[0010] A laminar flow fan is located at the air inlet or outlet above the high-efficiency filter and is used to transport the hydrogen peroxide gas generated by the vaporized hydrogen peroxide generator to the high-efficiency filter;

[0011] A high-efficiency filter is installed at the entrance of the main cabin to filter the gas so that the filtered hydrogen peroxide gas enters the main cabin for sterilization;

[0012] The return air wall is located on one side of the main cabin and is used to guide the air coming out of the main cabin to the air inlet of the laminar flow fan to form a circulating sterilization channel to achieve circulating sterilization. A circulating valve is also provided in the circulating sterilization channel;

[0013] The atomized hydrogen peroxide generator is located below the high-efficiency filter and is used to atomize and generate hydrogen peroxide gas, and then send the atomized hydrogen peroxide gas into the main cabin for diffusion sterilization;

[0014] An internal circulation catalytic decomposer is connected to the return air wall and the air inlet of the laminar flow fan, respectively, and is used to decompose hydrogen peroxide gas through internal circulation;

[0015] The air inlet fan provides air from outside the isolator to the main cabin through the air inlet valve.

[0016] Furthermore, it also includes an external exhaust pressure-maintaining catalytic decomposer, which is equipped with an external exhaust pressure-maintaining high-efficiency filter and an external exhaust pressure-maintaining fan. It borrows one or more catalytic decomposers of the internal circulation catalytic decomposer, uses the external exhaust pressure-maintaining fan to take air from the room, and discharges it back into the room after passing through the catalytic decomposer and the external exhaust pressure-maintaining high-efficiency filter in sequence.

[0017] Furthermore, it also includes an external pressure relief catalytic decomposer, which is connected to the pressure relief pipeline of the main cabin. When the pressure in the isolator is higher than the set value, the pressure relief proportional valve is opened to discharge the hydrogen peroxide gas into the room after passing through the high-efficiency filter, the pressure relief proportional valve and the external pressure relief catalytic decomposer.

[0018] Furthermore, it also includes an ambient temperature sensor outside the main cabin and / or a dew point temperature sensor inside the main cabin.

[0019] Furthermore, the atomized hydrogen peroxide generator is a Venturi atomized hydrogen peroxide generator.

[0020] Furthermore, a saturation sensor is provided in the main cabin, and the vaporized hydrogen peroxide generator is coordinated with the saturation sensor.

[0021] Furthermore, a flow equalizing membrane is provided between the high efficiency filter and the main compartment.

[0022] Furthermore, it also includes a pressure-maintaining external exhaust high-efficiency component that is detachably connected to the external exhaust pressure-maintaining catalytic decomposer. The pressure-maintaining external exhaust high-efficiency component includes an exhaust cavity, an air inlet cavity arranged on the exhaust cavity, and a pressure-maintaining manual valve arranged on the air inlet cavity. The external exhaust pressure-maintaining high-efficiency filter is located in the space formed by the air inlet cavity and the exhaust cavity.

[0023] Furthermore, the external pressure relief catalytic decomposer is also provided with one or more pressure relief valves.

[0024] Furthermore, a pressure relief assist blower is provided on the external pressure relief catalytic decomposer.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. Innovation of dual-mode sterilization method

[0027] Unique combination design: A dual-mode sterilization method combines vaporized and atomized hydrogen peroxide generators. The vaporized hydrogen peroxide generator enters the sterilization process from above the HEPA filter, eliminating sterilization risks in the area above the HEPA filter; the atomized hydrogen peroxide generator enters the sterilization process from below the HEPA filter, reducing HEPA filter adsorption. Furthermore, atomized sterilization offers advantages such as room temperature, low temperature rise, and rapid concentration increase. The two complement each other, comprehensively improving sterilization effectiveness and overcoming the limitations of a single sterilization method. This combination is rare in existing technologies and provides a more comprehensive and efficient solution for isolator sterilization.

[0028] 2. Innovation of internal circulation and residual waste removal system

[0029] High-efficiency internal circulation design: The internal circulation catalytic decomposer plays a key role in the exhaust stage. It adopts a full-inlet and full-exhaust circulation method, relying only on the internal gas circulation of the isolator, and can achieve a high replacement rate (1200 times / h) exhaust process without the need for external fresh air. Compared with the existing technology that relies on the fresh air volume of the room for exhaust (fresh air volume 500m 3 / h, replacement rate 400 times / h), the utility model greatly improves the exhaust efficiency, significantly shortens the exhaust time, and at the same time reduces the requirement for the fresh air volume in the room, enhances the applicability of the equipment, and reduces the customer's energy consumption. This is a major improvement on the traditional exhaust method.

[0030] 3. Precise environmental control innovation

[0031] Temperature and Saturation Control: An ambient temperature sensor installed outside the chamber, in conjunction with a dew point temperature sensor inside the main chamber, precisely regulates the operation of the atomized hydrogen peroxide generator, keeping the dew point temperature within an appropriate range and preventing condensation inside the main chamber, ensuring the stability and efficiency of the atomized sterilization process. Furthermore, feedback from the saturation sensor inside the main chamber precisely controls the operation of the vaporized hydrogen peroxide generator, stabilizing the saturation at 70% ± 5°C and optimizing the sterilization effect. This type of precise environmental control based on sensor feedback is relatively inadequate in existing technologies; the present invention achieves more precise control of sterilization conditions.

[0032] 4. Pressure regulation and security innovation

[0033] A comprehensive pressure management mechanism: During the pressure maintenance phase, an external pressure-maintaining catalytic decomposer is used to maintain pressure, reducing the temperature rise in the main cabin while ensuring a safe room environment and eliminating the need for fresh air. During the pressure relief phase, an external pressure-relief catalytic decomposer, along with components such as a pressure relief proportional valve, a manual pressure relief valve, and a pressure relief booster fan, ensures stable pressure in the main cabin and ensures that the exhaust gas meets room cleanliness requirements. This comprehensive pressure regulation and assurance mechanism, from pressure maintenance to pressure relief, is more comprehensive and reliable than existing technologies, enhancing the stability and safety of isolator operation.

[0034] 5. Equipment safety and maintenance innovation

[0035] Safe component design: The design of the pressure-maintaining and externally discharged high-efficiency components allows for safe replacement. The pressure-maintaining manual valve is used to seal toxic gases in the air inlet chamber, effectively protecting personnel safety. This design not only improves the convenience of equipment maintenance but also enhances the overall safety of the equipment. It is an innovation point that has been less considered in the existing technology in terms of equipment maintenance safety, and helps to reduce the risks during equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the atomization sterilization of the utility model;

[0037] Figure 2 It is a schematic diagram of the vaporization sterilization of the present utility model;

[0038] Figure 3 It is a schematic diagram of the internal circulation residue discharge of the utility model;

[0039] Figure 4 It is a schematic diagram of the pressure maintenance of the utility model;

[0040] Figure 5 It is a schematic diagram of the pressure maintenance of the utility model;

[0041] Figure 6 It is a structural diagram of the utility model;

[0042] Figure 7 This is a schematic diagram of the high-efficiency pressure-maintaining and external-discharging component of the utility model;

[0043] Figure 8 It is the sterilization temperature curve diagram of atomized hydrogen peroxide catalyst and vaporized hydrogen peroxide catalyst;

[0044] Figure 9 This is a saturation trend chart during the sterilization process of the atomized hydrogen peroxide generator;

[0045] Figure 10 This is the time trend chart of the D value during the sterilization process of the atomized hydrogen peroxide generator;

[0046] Figure 11 This is a comparison chart of the sterilization concentration curves of the atomized hydrogen peroxide generator and the vaporized hydrogen peroxide generator (conventional);

[0047] Figure 12 This is a comparison chart of the residual discharge time between the residual discharge method of the utility model and the residual discharge method of the existing external discharge structure.

[0048] In the figure, 1. Main cabin; 2. Vaporized hydrogen peroxide generator; 3. Laminar flow fan; 4. HEPA filter; 5. Return air wall; 6. Circulation valve; 7. Atomized hydrogen peroxide generator; 9. Internal circulation catalytic decomposer; 10. Inlet fan; 11. Inlet valve; 12. External exhaust pressure-maintaining catalytic decomposer; 13. External exhaust pressure-maintaining HEPA filter; 14. External exhaust pressure-maintaining fan; 15. External exhaust pressure-relief catalytic decomposer; 16. Pressure relief proportional valve; 17. Flow equalizing membrane; 18. Exhaust cavity; 19. Inlet cavity; 20. Pressure-maintaining manual valve; 21. Pressure relief manual valve; 22. Pressure relief booster fan; 23. Inlet filter; 24. Turbine fan; 25. Pressure-maintaining pneumatic valve. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0050] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0051] like Figure 1-7As shown, this dual-sterilization internal circulation aseptic isolator includes two sets of hydrogen peroxide generators, an internal circulation catalytic decomposer 9, an external pressure-maintaining catalytic decomposer 12, an external pressure-releasing catalytic decomposer 15, a turbulent fan 24, and an air inlet fan 10. One set of generators is a vaporized hydrogen peroxide generator 2, which enters the sterilization from above the high-efficiency filter 4. One set of generators is an atomized hydrogen peroxide generator 7, which enters the sterilization from below the high-efficiency filter 4 to achieve a rapid sterilization effect and prevent the high-efficiency filter 4 from adsorbing hydrogen peroxide gas during the sterilization process. The internal circulation catalytic decomposer 9 decomposes the hydrogen peroxide gas in the residual discharge stage, adopting a full-in and full-out method to improve the replacement rate. The external pressure-maintaining catalytic decomposer 12 operates in the pressure-maintaining stage, and fresh air enters the isolator. The gas in the main cabin 1 is discharged from the external pressure-maintaining catalytic decomposer, reducing the temperature rise in the main cabin 1. The sterilization process adopts dew point temperature or saturation control to improve the sterilization efficiency. Turbine fan 24: During the sterilization conditioning phase, it ensures uniform distribution of hydrogen peroxide within the isolator, ensuring uniform airflow and preventing sterilization blind spots. Inlet fan 10 draws indoor air into the isolator via inlet valve 11. Air passes through inlet filter 23 (which functions similarly to HEPA filter 4) and enters the location of laminar flow fan 3. The specific operating principles of vaporized hydrogen peroxide generator 2 and atomized hydrogen peroxide generator 7 are conventional and will not be further elaborated here.

[0052] In this embodiment, the two sets of hydrogen peroxide generators include a vaporized hydrogen peroxide generator 2 and an atomized hydrogen peroxide generator 7. The hydrogen peroxide gas generated by the vaporized hydrogen peroxide generator 2 enters from the laminar flow fan 3, then passes through the high-efficiency filter 4 and the flow equalizing membrane 17, reaches the main cabin 1, and then returns to the air inlet of the laminar flow fan 3 from the back return air wall 5 for circulation and sterilization; the atomized hydrogen peroxide generator 7 enters from the main cabin 1, and the stirring fan is installed between the high-efficiency filter 4 and the flow equalizing membrane 17 (not limited to this installation position, it can also be installed in the main cabin 1), and the hydrogen peroxide gas diffuses and sterilizes in the main cabin 1.

[0053] Preferably, the sterilization method of the atomized hydrogen peroxide generator 7 is as follows: an ambient temperature sensor is installed outside the main cabin 1, and the dew point temperature on the sensor inside the main cabin 1 is compared with the ambient temperature sensor to control the dew point temperature. When the dew point temperature is 0.1°C higher than the ambient temperature, compressed air is introduced to lower the dew point temperature, and the dew point temperature is controlled to be 0.1°C lower than the ambient temperature. The dew point temperature is the temperature at which the air is saturated and the temperature at which the air condenses. Figure 1 It is in the state of atomization sterilization.

[0054] Preferably, the atomized hydrogen peroxide generator 7 adopts the Venturi principle to atomize hydrogen peroxide into small particles with a particle size of less than 20 μm, which are almost invisible to the naked eye. The sterilization method is room temperature sterilization, and the temperature rise during the process is less than 0.1°C.

[0055] Preferably, the sterilization mode of the vaporized hydrogen peroxide generator 2 is: according to the saturation control on the saturation sensor in the main cabin 1, the saturation is controlled at 70% RS ± 5. Figure 2 It is in the vaporization sterilization state.

[0056] In this embodiment, if Figure 3 As shown, the internal circulation catalytic decomposer 9 is connected to the back return air wall 5 and the air inlet of the front laminar flow fan 3. The circulation valve 6 is closed in the exhaust stage, and a full-inlet and full-exhaust circulation method is adopted. The hydrogen peroxide gas is decomposed by multiple sets of internal circulation decomposers (preferably four sets) (the number of internal circulation decomposers is matched according to the size of the cabin), without the help of fresh air from the outside, and the gas circulation is completed only inside the isolator.

[0057] In this embodiment, the external pressure-maintaining catalytic decomposer 12 is connected to the end of one of the catalytic decomposers of the internal circulation catalytic decomposer 9 (shared with one of the internal circulation catalytic decomposers 9), and comprises a catalytic decomposer, an external pressure-maintaining high-efficiency filter 13, several valves (such as a manual pressure-maintaining valve 20 and a pneumatic pressure-maintaining valve 25), and an external pressure-maintaining fan 14. During the pressure-maintaining phase, fresh air is drawn from the room (using the air intake fan 10), and the exhaust air passes through the catalytic decomposer, then passes through the external pressure-maintaining fan 14, several valves, and the external pressure-maintaining high-efficiency filter 13 before being discharged into the room.

[0058] Preferably, the external pressure maintaining catalytic decomposer 12 is also provided with a pressure maintaining external high efficiency component, which includes an air inlet cavity 19, an air outlet cavity 18, and a pressure maintaining manual valve 20. The space formed by the air inlet cavity 19 and the air outlet cavity 18 can accommodate the external pressure maintaining high efficiency filter 13. This component can be safely replaced, and the manual valve is used to seal the toxic gas in the air inlet cavity 19, effectively protecting the safety of personnel. Figure 4-5 It is in the pressure holding state.

[0059] In this embodiment, the external pressure relief catalytic decomposer 15 is connected to the pressure relief pipeline (actually, it is installed on the air inlet cavity 19 through the pressure relief manual valve 21, and the outlet of the pressure relief manual valve is connected to the pressure relief proportional valve 16. Due to drawing reasons, the attached drawings may not show the connecting pipes, resulting in the appearance that they are not connected together. The content of the specification shall prevail). The external pressure relief catalytic decomposer 15 plays a role in the adjustment and sterilization stages. When the pressure in the isolator is higher than the set value in the adjustment and sterilization stage, the pressure relief proportional valve 16 opens, and the hydrogen peroxide gas is discharged from the pressure relief proportional valve 16 to the external pressure relief catalytic decomposer into the room. After passing through the external pressure relief catalytic decomposer, the concentration drops to below 1 ppm, ensuring the cleanliness requirements in the room). The gas in the main cabin 1 passes through the high-efficiency filter 4 to the pressure relief proportional valve 16, and then passes through the external pressure relief catalytic decomposer 15 to the pressure relief booster fan 22 and is discharged into the room.

[0060] Example 2

[0061] In this embodiment, the atomized hydrogen peroxide generator 7 was tested using the Venturi principle to atomize hydrogen peroxide into small particles with a particle size of less than 20 μm, which are almost invisible to the naked eye. The sterilization method is room temperature sterilization, and the temperature difference with the ambient temperature during the process is ±0.5°C. The temperature curve of the sterilization process is as follows Figure 8 As shown, the temperature difference of atomization sterilization is within ±0.5℃, and the temperature rise of vaporization sterilization is 4-5℃.

[0062] Since the temperature difference between the main cabin 1 and the isolator temperature is very small, the saturation value of the sterilization process can be controlled at 85-90%. There will be no condensation in the main cabin 1 during the process. The saturation control curve is as follows: Figure 9 As shown in the figure, using vaporization sterilization, due to the temperature rise of 5℃, the saturation can only be controlled at about 60%. Under the same temperature and concentration conditions during the sterilization process, the higher the saturation value is controlled, the better the sterilization effect is, such as Figure 10 As shown, at 500 ppm, with a saturation of 80% or higher, the D-value time is less than 1 minute; at 500 ppm, with a saturation of 60%, the D-value time is 2 minutes. The D-value time refers to the time required to kill one logarithm of bacteria. To kill six logarithms, the required time is D-value time * 6. In summary, to kill six logarithms of bacteria, the kill time is less than 6 minutes at a saturation of 80% RS; and 12 minutes at a saturation of 60% RS.

[0063] The atomized hydrogen peroxide generator 7 enters the main cabin 1 from below the equalizing membrane 17 for sterilization, reducing the adsorption of the high-efficiency filter, and the concentration rises quickly. The concentration curve is as follows Figure 11 As shown, the red curve represents the concentration curve for atomization sterilization, showing a rapid rise in concentration, reaching 500 ppm in just 19 minutes. The blue curve represents the concentration curve for conventional vaporization sterilization from above the HEPA filter, reaching 500 ppm in nearly 70 minutes. Clearly, the atomization sterilization method of the present invention achieves a rapid rise in concentration, shortens sterilization time, and reduces hydrogen peroxide consumption.

[0064] The exhaust adopts internal circulation full air volume replacement exhaust, and the catalytic decomposer decomposes hydrogen peroxide to replace the mixed gas in the main cabin 1, with a replacement rate of 1200 times / h. The existing external exhaust structure exhausts the exhaust, and the fresh air volume is generally 500m 3 / h, the replacement rate can only reach 400 times / h, the residual discharge time comparison chart is as follows Figure 12 As shown in the figure, the red rapid sterilization residual discharge time is 12 minutes and the concentration is less than 1ppm, while the blue conventional sterilization residual discharge time is 60 minutes and the concentration is less than 1ppm. Obviously, the residual discharge time of the utility model is significantly shorter than that of the fresh air replacement isolator.

[0065] The parts not described in detail in this utility model are prior art, so this utility model does not describe them in detail.

[0066] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0067] Although this document frequently uses terms such as main cabin 1, vaporized hydrogen peroxide generator 2, laminar flow fan 3, high-efficiency filter 4, return air wall 5, circulation valve 6, atomized hydrogen peroxide generator 7, internal circulation catalytic decomposer 9, air inlet fan 10, air inlet valve 11, external pressure-maintaining catalytic decomposer 12, external pressure-maintaining high-efficiency filter 13, external pressure-maintaining fan 14, external pressure-relieving catalytic decomposer 15, pressure-relieving proportional valve 16, flow-equalizing membrane 17, exhaust cavity 18, air inlet cavity 19, pressure-maintaining manual valve 20, pressure-relieving manual valve 21, pressure-relieving booster fan 22, air inlet filter 23, flow-disturbing fan 24, and pressure-maintaining pneumatic valve 25, the use of other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

[0068] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any product with the same or similar technical solutions as the present invention falls within the scope of protection of the present invention.

Claims

1. A double sterilization internal circulation aseptic isolator, comprising a main cabin, characterized in that: Also includes: A vaporized hydrogen peroxide generator is located at the air inlet of the high-efficiency filter and is used to vaporize and generate hydrogen peroxide gas; A laminar flow fan is located at the air inlet or outlet of the high-efficiency filter and is used to transport the hydrogen peroxide gas generated by the vaporized hydrogen peroxide generator to the high-efficiency filter; A high-efficiency filter is installed at the entrance of the main cabin to filter the gas so that the filtered hydrogen peroxide gas enters the main cabin for sterilization; A return air wall is provided on one side of the main cabin, and is used to guide the air coming out of the main cabin to the air inlet of the laminar flow fan to form a circulating sterilization channel to achieve circulating sterilization. A circulating valve is also provided in the circulating sterilization channel; An atomized hydrogen peroxide generator is provided below the high efficiency filter and is used to generate hydrogen peroxide gas by atomization and send the atomized hydrogen peroxide gas into the main cabin for diffusion sterilization; An internal circulation catalytic decomposer is connected to the return air wall and the air inlet of the laminar flow fan, respectively, and is used to decompose hydrogen peroxide gas through internal circulation; The air inlet fan provides air from outside the isolator to the main cabin through the air inlet valve.

2. A double sterilization internal circulation aseptic isolator according to claim 1, characterized in that: It also includes an external exhaust pressure-maintaining catalytic decomposer, which is equipped with an external exhaust pressure-maintaining high-efficiency filter and an external exhaust pressure-maintaining fan. One or more catalytic decomposers of the internal circulation catalytic decomposer are used, and the external exhaust pressure-maintaining fan is used to draw air from the room, which is then discharged back into the room after passing through the catalytic decomposer and the external exhaust pressure-maintaining high-efficiency filter in sequence.

3. A double sterilization internal circulation aseptic isolator according to claim 1, characterized in that: It also includes an external pressure relief catalytic decomposer, which is connected to the pressure relief pipe of the main cabin. When the pressure in the isolator is higher than the set value, the pressure relief proportional valve is opened to discharge the hydrogen peroxide gas into the room through the high-efficiency filter, the pressure relief proportional valve and the external pressure relief catalytic decomposer.

4. A double sterilization internal circulation aseptic isolator according to claim 1, characterized in that: It also includes an ambient temperature sensor outside the main cabin and / or a dew point temperature sensor inside the main cabin.

5. A double sterilization internal circulation aseptic isolator according to claim 1, characterized in that: The atomized hydrogen peroxide generator is a Venturi atomized hydrogen peroxide generator.

6. A double sterilization internal circulation aseptic isolator according to claim 1, characterized in that: A saturation sensor is also provided in the main cabin, and the vaporized hydrogen peroxide generator is coordinated with the saturation sensor.

7. A double sterilization internal circulation aseptic isolator according to claim 1, characterized in that: A flow equalizing membrane is provided between the high efficiency filter and the main compartment.

8. A double sterilization internal circulation aseptic isolator according to claim 2, characterized in that: It also includes a pressure-maintaining external exhaust high-efficiency component that is detachably connected to the external exhaust pressure-maintaining catalytic decomposer. The pressure-maintaining external exhaust high-efficiency component includes an exhaust cavity, an air inlet cavity arranged on the exhaust cavity, and a pressure-maintaining manual valve arranged on the air inlet cavity. The external exhaust pressure-maintaining high-efficiency filter is located in the space formed by the air inlet cavity and the exhaust cavity.

9. A double sterilization internal circulation aseptic isolator according to claim 3, characterized in that: The external exhaust pressure relief catalytic decomposer is also provided with one or more pressure relief valves.

10. A double sterilization internal circulation aseptic isolator according to claim 3, characterized in that: The external exhaust pressure relief catalytic decomposer is also provided with a pressure relief boosting blower.

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