Low-temperature formaldehyde sterilization process

Abstract

The invention relates to the technical field of low-temperature formaldehyde sterilization processes, and discloses a low-temperature formaldehyde sterilization process which comprises steps (1) to (6). By adopting the process provided by the invention, the sterilization work can be better carried out by preheating the sterilization work room, and the temperature range in the sterilization work room can be controlled through the heating device; the sterilization working chamber is continuously vacuumized, so that the pressure in the sterilization working chamber is kept at 10kPa, and the vaporization of the formaldehyde liquid can be accelerated; the sterilization operation is circularly carried out, so that the sterilization is more thorough; and finally, catalytic oxidation reaction is carried out through an oxidation catalyst, so that safer gas is discharged. By adopting the process, recycling is not needed, and the environmental pollution is also greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature formaldehyde sterilization technology, in particular to a low-temperature formaldehyde sterilization technology. Background Art

[0002] Formaldehyde has a highly effective sterilizing effect on various microorganisms, including bacterial propagules, spores, mycobacteria, fungi and viruses. Its sterilization mechanism is that formaldehyde is an alkylating agent, which can alkylate and denature the active genes of bacterial proteins, enzymes and nucleic acids. It can generate methine derivatives with amino, sulfhydryl, hydroxyl and carboxyl groups on protein molecules, thereby destroying bacterial proteins (especially enzymes) and causing the death of microorganisms. However, the existing low-temperature formaldehyde sterilization methods mostly use a mixture of formaldehyde vapor and low-temperature water vapor, which has a low sterilization efficiency, and the waste liquid containing formaldehyde is difficult to recycle, and direct discharge will cause environmental pollution and other problems. Summary of the invention

[0003] The present invention mainly provides a low-temperature formaldehyde sterilization process to solve the problems that the existing low-temperature formaldehyde sterilization methods mostly use a mixture of formaldehyde vapor and low-temperature water vapor, the sterilization efficiency is low, and the waste liquid containing formaldehyde is difficult to recover, and direct discharge will cause environmental pollution.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A low-temperature formaldehyde sterilization process, comprising: a frame, a sterilization studio, a puncture structure, a vacuum pump, a formaldehyde purification structure, an air intake filter and a closing cover for closing the sterilization studio; the sterilization studio is provided with an air extraction port and an air intake port, the sterilization studio is provided with a first liquid inlet control valve, the sterilization studio is provided with a first liquid evaporation box, the first liquid inlet control valve is communicated with the first liquid evaporation box, the air extraction port is provided with an air extraction solenoid valve, and the air intake solenoid valve is provided with an air intake solenoid valve; the output end of the puncture structure is communicated with the first liquid inlet control valve, and a first power pump is connected in series between the puncture structure and the first liquid inlet control valve; one end of the vacuum pump is communicated with the air extraction solenoid valve, and the other end is communicated with the formaldehyde purification structure; the air intake filter is communicated with the air intake solenoid valve; the sterilization studio is provided with a detection sensor for detecting the pressure in the room; the sterilization studio is provided with a heating device for heating the room;

[0006] The following steps are also included:

[0007] (1) Place the items in the sterilization chamber and heat the sterilization chamber to a preset temperature threshold;

[0008] (2) evacuating the sterilization chamber by a vacuum pump, and when the pressure is within 20 kPa lower than the atmospheric pressure at the location where the equipment is installed, introducing formaldehyde liquid into the first liquid evaporation box, and heating and evaporating the formaldehyde liquid through the first liquid evaporation box;

[0009] (3) Continue to evacuate the sterilization chamber to maintain a vacuum of 10 kPa, wait for the articles to be exposed to the formaldehyde gas, and maintain the negative pressure for 5 to 10 minutes; then, return the pressure in the sterilization chamber to within 20 kPa below the atmospheric pressure where the equipment is installed;

[0010] (4) Repeating steps (2) to (3) 6 to 12 times;

[0011] (5) After the cycle is completed, all the gas in the sterilization workroom is pumped out by a vacuum pump, and then discharged after being purified by the formaldehyde purification structure, and the temperature in the formaldehyde purification structure in this step is heated to a preset temperature threshold;

[0012] (6) During the process of exhausting all the gas in the sterilization working room in step (5), air is introduced through the air inlet to return the sterilization working room to normal pressure, and then the sterilization working room is opened to take out the objects.

[0013] Among them, the first liquid evaporation box has a heating and evaporation function, which is realized by any existing heating component, so as to realize the evaporation of the liquid therein. The first power pump can adopt existing technology, such as: peristaltic pump. The formaldehyde purification structure has an oxidation catalyst part that can react with formaldehyde for purification. The oxidation catalyst part is a consumable. Heating the temperature in the formaldehyde purification structure to a preset temperature threshold can allow formaldehyde to be better decomposed. The connection method between the various components in this application includes but is not limited to pipe connection, direct connection of ports between components, etc. Each component in this application can be installed on a rack or on other components. The heating device adopts a heating device that can be temperature controlled. Among them, the preset temperature threshold for heating and heating the sterilization studio in step (1) is 50℃-78℃, and the preset temperature threshold for heating the temperature in the formaldehyde purification structure in step (5) is 270℃-400℃, and the best is 300℃-320℃.

[0014] Working principle of the equipment: Place the medical device to be sterilized in the sterilization workroom, close the sealing cover and the sterilization workroom, and evacuate the sterilization workroom through a vacuum pump. When the detection sensor detects that the pressure in the sterilization workroom reaches the preset threshold, the formaldehyde in the puncture structure is passed into the first liquid evaporation box through the first power pump, and then the formaldehyde liquid in the first liquid evaporation box is heated and evaporated, so that the formaldehyde gas fills the sterilization workroom; all the gas in the sterilization workroom is extracted to the formaldehyde purification structure through the vacuum pump, and is purified again by the formaldehyde purification structure before being discharged into the air; at the same time, during the initial air extraction and pressure reduction, the air intake solenoid valve is closed to achieve pressure reduction in the sterilization workroom; before the final exhaust, the air intake solenoid valve is opened and the vacuum pump is working, and the outside air can enter the sterilization workroom after passing through the air intake filter to ensure that the pressure in the sterilization workroom is in a normal state. The structure of the present application reduces the number of working steps and improves working efficiency compared to mixing formaldehyde gas with low-temperature steam. It also eliminates the response structure for generating steam and processing liquid containing formaldehyde condensation, reduces costs, and directly heats and evaporates formaldehyde, which is more efficient. An air intake filter is provided to filter the air entering the sterilization studio.

[0015] By adopting the process of the present application, the sterilization work can be carried out better by preheating the sterilization workroom, and the temperature range in the sterilization workroom can be controlled by a heating device; and the sterilization workroom is continuously evacuated to maintain the temperature at 10 kPa to accelerate the vaporization of the formaldehyde liquid; the sterilization operation is cyclically performed to make the sterilization more thorough; finally, an oxidation catalyst is used to catalyze the oxidation reaction, thereby discharging safer gases; the process does not require recycling, and also greatly reduces environmental pollution.

[0016] Furthermore, it also includes an internal circulation structure, which includes a formaldehyde decomposition chamber, a heat dissipation device and an internal circulation fan; the upper end of the formaldehyde decomposition chamber is connected to one end of the heat dissipation device, the other end of the heat dissipation device is connected to one end of the internal circulation fan, and the other end of the internal circulation fan is connected to the air inlet; the sterilization studio is provided with a circulation upper port, and the lower end of the formaldehyde decomposition chamber is connected to the circulation upper port;

[0017] The following steps are included between step (4) and step (5):

[0018] In step (4.1), before purification and discharge through the formaldehyde purification structure, the internal circulation fan is started to drive the mixed gas containing formaldehyde gas in the sterilization working chamber to circulate in the internal circulation structure, so that the mixed gas containing formaldehyde gas passes through the formaldehyde decomposition chamber for preliminary purification treatment, and the gas discharged from the formaldehyde decomposition chamber is cooled by the heat dissipation device, and the temperature in the formaldehyde purification structure in this step is heated to a preset temperature threshold.

[0019] Among them, the formaldehyde decomposition chamber is provided with an oxidation catalyst part that can react with formaldehyde for purification, and the formaldehyde decomposition chamber is provided with a heating structure. When in use, after the sterilization work is completed, the internal circulation fan is started to drive the mixed gas with formaldehyde gas in the sterilization working chamber to circulate in the internal circulation structure, so that the mixed gas with formaldehyde gas is preliminarily purified. At the same time, the heat dissipation device can cool down the gas heated in the formaldehyde decomposition chamber and return it to the sterilization working chamber. With this structure, the formaldehyde in the mixed gas can be preliminarily treated, so that the discharged mixed gas is safer in combination with the formaldehyde purification structure.

[0020] By adopting this step (4.1), all gases in the sterilization chamber can be circulated, so that formaldehyde can be further catalyzed and oxidized by the oxidizing catalyst in the formaldehyde decomposition chamber in the circulation structure, thereby improving safety.

[0021] Furthermore, a first ball valve is connected in series between the lower end of the formaldehyde decomposition chamber and the upper circulation port, and a second ball valve is connected in series between the other end of the internal circulation fan and the air inlet. The first ball valve and the second ball valve are used to close the internal circulation structure when not in use, thereby avoiding excessive consumption of consumables for purifying formaldehyde in the formaldehyde decomposition chamber and reducing the formaldehyde gas concentration in the sterilization chamber.

[0022] Furthermore, the puncture mechanism includes a sealed container for placing a formaldehyde tank, an electric push rod and a puncture needle; the puncture needle is installed at the output end of the electric push rod, a sealing member matching the puncture needle is installed on the sealed container, the puncture needle moves in the sealed container driven by the electric push rod, and the liquid hole of the sealed container is connected to the first liquid inlet control valve through the first power pump. When in use, the formaldehyde tank containing formaldehyde is placed in the sealed container and sealed, and the electric push rod drives the puncture needle to pass through the sealing member to puncture the formaldehyde tank in the sealed container. After puncture, the electric push rod drives the puncture needle to reset, and the formaldehyde liquid in the formaldehyde tank flows into the sealed container. At the same time, the formaldehyde liquid in the sealed container can be transported to the first liquid evaporation box through the first power pump; when the formaldehyde liquid in the sealed container is consumed, the sealed container is opened to replace the formaldehyde tank. This structure replaces the corresponding formaldehyde tank after the formaldehyde in the sealed container is consumed, and the formaldehyde tank will not be punctured open until it enters the sealed container to allow the formaldehyde to flow into the sealed container. Compared with opening the container containing formaldehyde and then pouring the formaldehyde into the corresponding container of the equipment, this can reduce the safety hazards caused by adding formaldehyde to the equipment.

[0023] Furthermore, a heating plate is installed on the outer wall of the sealed container. With this structure, the sealed container can be heated by the heating plate, so that the formaldehyde liquid in the sealed container evaporates and enters the sterilization working room, and then the sealed container is opened to safely replace the formaldehyde tank.

[0024] Furthermore, the formaldehyde purification structure includes a first purification chamber and a second purification chamber, the first purification chamber is provided with a communication port connected to the vacuum pump, the second purification chamber is provided with an exhaust port, and the first purification chamber is connected to the second purification chamber. With this structure, the formaldehyde content in the mixed gas can be further reduced through two purifications.

[0025] Furthermore, it also includes an exhaust gas blower, which is connected to the exhaust port. With this structure, the mixed gas can be better discharged in conjunction with the formaldehyde purification structure.

[0026] Furthermore, the machine also includes a housing mounted on the frame. The housing can protect the components on the frame.

[0027] Beneficial effects: The process of the present application can be used to preheat the sterilization workroom so that the sterilization work can be carried out better. The temperature range in the sterilization workroom can be controlled by a heating device; and the sterilization workroom is continuously evacuated to maintain a pressure of 10 kPa to accelerate the vaporization of the formaldehyde liquid; the sterilization operation is cyclically performed to make the sterilization more thorough; and finally, an oxidation catalyst is used to catalyze the oxidation reaction to discharge safer gases; this process does not require recycling and greatly reduces environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic oblique view of the formaldehyde sterilizer of this embodiment;

[0029] Figure 2 is a schematic rear view of the formaldehyde sterilizer of this embodiment;

[0030] Figure 3 This is a schematic front view of the formaldehyde sterilizer of this embodiment;

[0031] Figure 4 This is a left side schematic diagram of the formaldehyde sterilizer of this embodiment;

[0032] Figure 5 is a cross-sectional schematic diagram of the puncture structure of this embodiment;

[0033] Figure 6 is an oblique schematic diagram of the puncture structure of this embodiment;

[0034] Figure 7 This is a schematic oblique view of the formaldehyde purification structure of this embodiment;

[0035] Figure 8 This is a schematic cross-sectional view of the formaldehyde purification structure of this embodiment;

[0036] Fig. 9 Schematic cross-sectional view of the formaldehyde decomposition chamber of this embodiment.

[0037] Figure numerals: frame 1, sterilization studio 2, air extraction port 21, air inlet 22, first liquid inlet control valve 23, first liquid evaporation box 25, air extraction solenoid valve 27, air inlet solenoid valve 28, puncture structure 3, closed container 31, electric push rod 32, puncture needle 33, seal 34, heating plate 35, vacuum pump 5, formaldehyde purification structure 6, first purification chamber 61, second purification chamber 62, connecting port 63, exhaust port 64, purification chamber heating assembly 65, purification chamber temperature sensor 66, air intake filter 7, internal circulation structure 8, formaldehyde decomposition chamber 81, decomposition chamber shell 811, decomposition chamber heating assembly 812, decomposition chamber temperature sensor 813, heat dissipation device 82, internal circulation fan 83, first ball valve 84, second ball valve 85, exhaust fan 9, heating device 10, oxidation catalyst part 11. DETAILED DESCRIPTION

[0038] The low-temperature formaldehyde sterilization process technology scheme of the present invention will be further described in detail below in conjunction with embodiments.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] like Figures 1 to 9As shown, a formaldehyde sterilizer of the present embodiment comprises a frame 1, a sterilization studio 2, a puncture structure 3, a vacuum pump 5, a formaldehyde purification structure 6, an air inlet filter 7 and a closing cover for closing the sterilization studio 2; the sterilization studio 2 is provided with an air suction port 21 and an air inlet 22, the sterilization studio 2 is provided with a first liquid inlet control valve 23, the sterilization studio 2 is provided with a first liquid evaporation box 25, the first liquid inlet control valve 23 is connected to the first liquid evaporation box 25, the air suction port 21 is provided with an air suction solenoid valve 27, the air inlet An air inlet solenoid valve 28 is installed on the air port 22; the output end of the puncture structure 3 is connected to the first liquid inlet control valve 23, and a first power pump is connected in series between the puncture structure 3 and the first liquid inlet control valve 23; one end of the vacuum pump 5 is connected to the air extraction solenoid valve 27, and the other end is connected to the formaldehyde purification structure 6; the air inlet filter 7 is connected to the air inlet solenoid valve 28; a detection sensor for detecting the pressure in the room is installed on the sterilization studio 2; a heating device 10 for heating the room is installed on the sterilization studio 2;

[0041] The following steps are also included:

[0042] (1) Place the items in the sterilization room and heat the sterilization room to a preset temperature threshold;

[0043] (2) evacuating the sterilization chamber by a vacuum pump, and when the pressure is within 20 kPa lower than the atmospheric pressure at the location where the equipment is installed, introducing formaldehyde liquid into the first liquid evaporation box, and heating and evaporating the formaldehyde liquid through the first liquid evaporation box;

[0044] (3) Continue to evacuate the sterilization chamber to maintain a vacuum of 10 kPa, wait for the articles to be exposed to the formaldehyde gas, and maintain the negative pressure for 5 to 10 minutes; then, return the pressure in the sterilization chamber to within 20 kPa below the atmospheric pressure where the equipment is installed;

[0045] (4) Repeating steps (2) to (3) 6 to 12 times;

[0046] (5) After the cycle is completed, all the gas in the sterilization workroom is pumped out by a vacuum pump, and then discharged after being purified by the formaldehyde purification structure, and the temperature in the formaldehyde purification structure in this step is heated to a preset temperature threshold;

[0047] (6) During the process of exhausting all the gas in the sterilization working room in step (5), air is introduced through the air inlet to return the sterilization working room to normal pressure, and then the sterilization working room is opened to take out the objects.

[0048] Further, if Figure 2As shown, it also includes an internal circulation structure 8, which includes a formaldehyde decomposition chamber 81, a heat dissipation device 82 and an internal circulation fan 83; the upper end of the formaldehyde decomposition chamber 81 is connected to one end of the heat dissipation device 82, the other end of the heat dissipation device 82 is connected to one end of the internal circulation fan 83, and the other end of the internal circulation fan 83 is connected to the air inlet 22; the sterilization studio 2 is provided with a circulation upper opening, and the lower end of the formaldehyde decomposition chamber 81 is connected to the circulation upper opening. Fig. 9 As shown, the formaldehyde decomposition chamber 81 includes a decomposition chamber shell 811, and an oxidation catalyst member 11, a decomposition chamber heating component 812 and a decomposition chamber temperature sensor 813 installed in the decomposition chamber shell 811. The decomposition chamber heating component 812 is a heating tube. Fig. 9 The arrow direction is the direction of airflow.

[0049] The following steps are included between step (4) and step (5):

[0050] In step (4.1), before purification and discharge through the formaldehyde purification structure, the internal circulation fan is started to drive the mixed gas containing formaldehyde gas in the sterilization working chamber to circulate in the internal circulation structure, so that the mixed gas containing formaldehyde gas passes through the formaldehyde decomposition chamber for preliminary purification treatment, and the gas discharged from the formaldehyde decomposition chamber is cooled by the heat dissipation device, and the temperature in the formaldehyde purification structure in this step is heated to a preset temperature threshold.

[0051] When in use, after the sterilization work is completed, the internal circulation fan is started to drive the mixed gas with formaldehyde gas in the sterilization workroom to circulate in the internal circulation structure, so that the mixed gas with formaldehyde gas undergoes preliminary purification treatment. At the same time, the heat dissipation device can cool down the gas heated in the formaldehyde decomposition chamber and return it to the sterilization workroom. With this structure, the formaldehyde in the mixed gas can be preliminarily treated, so that the discharged mixed gas is safer in combination with the formaldehyde purification structure.

[0052] By adopting this step (4.1), all gases in the sterilization chamber can be circulated, so that formaldehyde can be further catalyzed and oxidized by the oxidizing catalyst in the formaldehyde decomposition chamber in the circulation structure, thereby improving safety.

[0053] Further, if Figure 4 As shown, a first ball valve 84 is connected in series between the lower end of the formaldehyde decomposition chamber 81 and the upper circulation port, and a second ball valve 85 is connected in series between the other end of the internal circulation fan 83 and the air inlet 22. The first ball valve 84 and the second ball valve 85 are used to close the internal circulation structure when not in use, thereby avoiding excessive consumption of consumables for purifying formaldehyde in the formaldehyde decomposition chamber 81 and reducing the formaldehyde gas concentration in the sterilization studio.

[0054] Further, if Figure 5 , Figure 6 As shown, the puncture mechanism includes a sealed container 31 for placing a formaldehyde tank, an electric push rod 32 and a puncture needle 33; the puncture needle 33 is installed at the output end of the electric push rod 32, and a seal 34 matching the puncture needle 33 is installed on the sealed container 31. The puncture needle 33 moves in the sealed container 31 driven by the electric push rod 32, and the output end of the sealed container 31 is connected to the first liquid inlet control valve 23 through the first power pump. The sealed container 31 and the electric push rod 32 of the puncture structure 3 are both installed on the puncture frame, and the puncture frame is installed on the frame 1. . A liquid cavity is provided at the bottom of the sealed container 31, and the output end of the sealed container 31 is opened on the liquid cavity, and one end of the first power pump is connected to the output end of the liquid cavity. When in use, a formaldehyde tank filled with formaldehyde is placed in a sealed container and sealed, and the electric push rod 32 drives the puncture needle 33 to penetrate the seal 34 to puncture the formaldehyde tank in the sealed container 31. After puncture, the electric push rod 32 drives the puncture needle 33 to reset, and the formaldehyde liquid in the formaldehyde tank flows into the sealed container. At the same time, the formaldehyde liquid in the sealed container 31 can be transported to the first liquid evaporation box 25 through the first power pump; when the formaldehyde liquid in the sealed container 31 is consumed, the sealed container 31 is opened to replace the formaldehyde tank. Compared with opening the container filled with formaldehyde and then pouring the formaldehyde into the corresponding container of the device, this method can reduce the safety hazards caused by adding formaldehyde to the device.

[0055] Further, if Figure 5 As shown, a heating plate 35 is installed on the outer wall of the sealed container 31. With this structure, the sealed container 31 can be heated by the heating plate 35, so that the formaldehyde liquid in the sealed container 31 evaporates and enters the sterilization studio 2, and then the sealed container 31 is opened to safely replace the formaldehyde tank.

[0056] Further, if Figure 7 As shown, the formaldehyde purification structure 6 includes a first purification chamber 61 and a second purification chamber 62. The first purification chamber 61 is provided with a communication port 63 connected to the vacuum pump 5, and the second purification chamber 62 is provided with an exhaust port 64. The first purification chamber 61 is connected to the second purification chamber 62. The first purification chamber 61 and the second purification chamber 62 are both installed with an oxidation catalyst 11, a purification chamber heating component 65 and a purification chamber temperature sensor 66. Figure 7 The middle arrow indicates the airflow direction. With this structure, the formaldehyde content in the mixed gas can be further reduced through two purifications.

[0057] Further, if Figure 2 , Figure 3 As shown, it also includes an exhaust gas fan 9, and the exhaust gas fan 9 is connected to the exhaust port 64.

[0058] Furthermore, it also includes a shell installed on the frame 1.

[0059] Working principle of the equipment: place the medical device to be sterilized in the sterilization studio 2, close the sealing cover and the sterilization studio 2, and evacuate the sterilization studio 2 through the vacuum pump 5. When the detection sensor detects that the pressure in the sterilization studio 2 reaches the preset threshold, the formaldehyde in the puncture structure 3 is passed into the first liquid evaporation box 25 through the first power pump, and then the formaldehyde liquid in the puncture structure 3 is heated and evaporated by the first liquid evaporation box 25, so that the formaldehyde gas fills the sterilization studio 2; all the gas in the sterilization studio 2 is extracted to the formaldehyde purification structure 6 by the vacuum pump 5, and is purified again by the formaldehyde purification structure 6 and then discharged into the air; at the same time, when the air is initially evacuated and the pressure is reduced, the air intake solenoid valve 28 is closed to achieve pressure reduction in the sterilization studio 2; before the final exhaust, the air intake solenoid valve 28 is opened and the vacuum pump 5 is working, and the outside air can enter the sterilization studio 2 after passing through the air intake filter 7 to ensure that the pressure in the sterilization studio 2 is in a normal state. The structure of the present application reduces the number of working steps, improves working efficiency, and eliminates the response structure for generating steam and processing liquid containing formaldehyde condensation, thereby reducing costs. The formaldehyde can be directly heated and evaporated, which is more efficient. The present application uses the formaldehyde purification structure 6 to purify the mixed gas to be discharged multiple times, thereby reducing the toxicity of the discharged mixed gas. The air intake filter 7 is arranged to filter the air entering the sterilization studio 2.

[0060] By adopting the process of the present application, the sterilization work can be carried out better by preheating the sterilization workroom, and the temperature range in the sterilization workroom can be controlled by a heating device; and the sterilization workroom is continuously evacuated to maintain the temperature at 10 kPa to accelerate the vaporization of the formaldehyde liquid; the sterilization operation is cyclically performed to make the sterilization more thorough; finally, an oxidation catalyst is used to catalyze the oxidation reaction, thereby discharging safer gases; the process does not require recycling, and also greatly reduces environmental pollution.

[0061] Although embodiments of the present 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 present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature formaldehyde sterilization process, characterized in that: include: A frame, a sterilization studio, a puncture structure, a vacuum pump, a formaldehyde purification structure, an air intake filter and a closing cover for closing the sterilization studio; the sterilization studio is provided with an air extraction port and an air intake port, the sterilization studio is provided with a first liquid inlet control valve, the sterilization studio is provided with a first liquid evaporation box, the first liquid inlet control valve is communicated with the first liquid evaporation box, the air extraction port is provided with an air extraction solenoid valve, and the air intake port is provided with an air intake solenoid valve; the output end of the puncture structure is communicated with the first liquid inlet control valve, and a first power pump is connected in series between the puncture structure and the first liquid inlet control valve; one end of the vacuum pump is communicated with the air extraction solenoid valve, and the other end is communicated with the formaldehyde purification structure; the air intake filter is communicated with the air intake solenoid valve; the sterilization studio is provided with a detection sensor for detecting the pressure in the room; the sterilization studio is provided with a heating device for heating the room; The following steps are also included: (1) Place the items in the sterilization chamber and heat the sterilization chamber to a preset temperature threshold; (2) evacuating the sterilization chamber by a vacuum pump, and when the pressure is within 20 kPa lower than the atmospheric pressure at the location where the equipment is installed, introducing formaldehyde liquid into the first liquid evaporation box, and heating and evaporating the formaldehyde liquid through the first liquid evaporation box; (3) Continue to evacuate the sterilization chamber to maintain a vacuum of 10 kPa, wait for the articles to be exposed to the formaldehyde gas, and maintain the negative pressure for 5 to 10 minutes; then, return the pressure in the sterilization chamber to within 20 kPa below the atmospheric pressure where the equipment is installed; (4) Repeating steps (2) to (3) 6 to 12 times; (5) After the cycle is completed, all the gas in the sterilization workroom is pumped out by a vacuum pump, and then discharged after being purified by the formaldehyde purification structure, and the temperature in the formaldehyde purification structure in this step is heated to a preset temperature threshold; (6) During the process of exhausting all the gas in the sterilization working room in step (5), air is introduced through the air inlet to return the sterilization working room to normal pressure, and then the sterilization working room is opened to take out the objects.

2. A low-temperature formaldehyde sterilization process according to claim 1, characterized in that: It also includes an internal circulation structure, which includes a formaldehyde decomposition chamber, a heat dissipation device and an internal circulation fan; the upper end of the formaldehyde decomposition chamber is connected to one end of the heat dissipation device, the other end of the heat dissipation device is connected to one end of the internal circulation fan, and the other end of the internal circulation fan is connected to the air inlet; the sterilization studio is provided with a circulation upper opening, and the lower end of the formaldehyde decomposition chamber is connected to the circulation upper opening; The following steps are included between step (4) and step (5): In step (4.1), before purification and discharge through the formaldehyde purification structure, the internal circulation fan is started to drive the mixed gas containing formaldehyde gas in the sterilization working chamber to circulate in the internal circulation structure, so that the mixed gas containing formaldehyde gas passes through the formaldehyde decomposition chamber for preliminary purification treatment, and the gas discharged from the formaldehyde decomposition chamber is cooled by the heat dissipation device, and the temperature in the formaldehyde purification structure in this step is heated to a preset temperature threshold.

3. A low-temperature formaldehyde sterilization process according to claim 1, characterized in that: A first ball valve is connected in series between the lower end of the formaldehyde decomposition chamber and the upper circulation port, and a second ball valve is connected in series between the other end of the internal circulation fan and the air inlet.

4. A low-temperature formaldehyde sterilization process according to claim 1, characterized in that: The puncture mechanism includes a closed container for placing a formaldehyde tank, an electric push rod and a puncture needle; the puncture needle is installed at the output end of the electric push rod, and a seal that matches the puncture needle is installed on the closed container. The puncture needle moves in the closed container driven by the electric push rod, and the liquid hole of the closed container is connected to the first liquid inlet control valve through the first power pump.

5. A low-temperature formaldehyde sterilization process according to claim 4, characterized in that: A heating plate is installed on the outer side wall of the closed container.

6. A low-temperature formaldehyde sterilization process according to claim 1, characterized in that: The formaldehyde purification structure comprises a first purification chamber and a second purification chamber. The first purification chamber is provided with a communication port connected to the vacuum pump. The second purification chamber is provided with an exhaust port. The first purification chamber is connected to the second purification chamber.

7. A low-temperature formaldehyde sterilization process according to claim 6, characterized in that: It also includes an exhaust gas fan, which is connected to the exhaust port.

8. A low-temperature formaldehyde sterilization process according to claim 1, characterized in that: Also included is a shell mounted on the frame.

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