Biological safety end disinfection and sterilization device and experiment space

Abstract

The invention relates to a biological safety final disinfection and sterilization device and an experimental space, which are used for solving the problem of residual pollution after formaldehyde disinfection. The device comprises an air supply three-way valve, an air return three-way valve, a formaldehyde generator and an absorption tank, and dual-working-condition operation of disinfection and formaldehyde adsorption is realized by switching valves. Under the disinfection working condition, formaldehyde gas generated by the formaldehyde generator is circulated to the experiment space for sterilization; under the adsorption working condition, residual formaldehyde is discharged after being treated by an absorption tank (containing an adsorption liquid and a gas equalizing pipe), so that no secondary pollution is ensured. The formaldehyde generator adopts silicone oil to heat paraformaldehyde to decompose and produce gas, and the absorption tank prolongs the gas contact time through a backflow cavity, so that the adsorption efficiency is improved. A sensor and a wallboard cleaning robot are integrated in the experimental space, formaldehyde concentration is monitored in real time, and automatic cleaning is achieved. The invention has the advantages of efficient sterilization and environmental protection, and is suitable for biosafety laboratories and other scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of disinfection and sterilization, and more specifically, it relates to a biological safety terminal disinfection and sterilization device and an experimental space. Background Art

[0002] Formaldehyde, a colorless and pungent gas, also known as formic aldehyde, is colorless and irritating to human eyes, nose, etc. It is easily soluble in water and ethanol. The highest concentration of its aqueous solution can reach 55%, usually 40%, which is called formaldehyde water, commonly known as formalin. It has reducibility, especially in alkaline solutions, with stronger reducing ability. It can burn, and its vapor forms an explosive mixture with air, with an explosion limit of 7%-73% and a flash point of about 300°C. It can be prepared by dehydrogenation or oxidation of methanol under the catalysis of metals such as silver and copper, or separated from the oxidation products of hydrocarbons. It can be used as raw materials for phenolic resin, urea-formaldehyde resin, vinylon, hexamine, pentaerythritol, dyes, pesticides, disinfectants, etc.

[0003] Among many disinfection and sterilization schemes, the disinfection and sterilization effect of formaldehyde vapor on the biological safety experimental space is the most ideal. However, on the other hand, the remaining residue after formaldehyde disinfection pollutes the environment and personnel, and is gradually phased out by users. How to clean and eliminate the residual formaldehyde in the experimental space after disinfecting and sterilizing the experimental space with formaldehyde vapor is a difficult point in the prior art. Summary of the Invention

[0004] The present invention overcomes the problem in the prior art that the residual formaldehyde in the experimental space after disinfecting and sterilizing the experimental space with formaldehyde vapor is likely to have an adverse effect on the environment and personnel; provides a biological safety terminal disinfection and sterilization device, which can use the oxidation-reduction principle to recover the excess formaldehyde after formaldehyde disinfects and sterilizes the biological safety experimental space, ensuring that all the residual formaldehyde is removed, ensuring no residual formaldehyde, and no secondary pollution will occur.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A biological safety terminal disinfection and sterilization device, comprising: a supply air three-way valve, a return air three-way valve, and a formaldehyde generator; The three interfaces of the supply air three-way valve are respectively connected to the fresh air pipe, the supply air pipe, and the outlet of the formaldehyde generator; The three interfaces of the return air three-way valve are respectively connected to the recovery pipe, the return air pipe, and the inlet of the formaldehyde generator; The end of the supply air pipe is provided with an air outlet interface connected to the experimental space, and a supply air fan is arranged on the supply air pipe; The end of the return air pipe is provided with an air return interface connected to the experimental space, and a return air fan is arranged on the return air pipe; The end of the recovery pipe far from the return air three-way valve is connected to the air inlet of the absorption tank.

[0006] In this application, by setting the above structure and switching the air supply three-way valve and the return air three-way valve, the switching between the disinfection working condition and the formaldehyde residue adsorption working condition can be achieved. Under the disinfection working condition, the formaldehyde gas in the formaldehyde generator can enter the experimental space to disinfect the interior of the experimental space. After the disinfection is completed, it enters the formaldehyde residue adsorption working condition. Under this working condition, the residual formaldehyde gas in the experimental space can be sucked out. After the residual formaldehyde gas passes through the absorption tank, the formaldehyde gas is absorbed by the absorption tank in the absorption tank and then discharged into the air to achieve the rapid elimination of formaldehyde gas.

[0007] Therefore, this application can utilize the oxidation-reduction principle to recover the excess formaldehyde after disinfecting and sterilizing the biosafety experimental space with formaldehyde, ensure that all the residual formaldehyde is removed, ensure no formaldehyde residue, and prevent secondary pollution.

[0008] Preferably, the formaldehyde generator includes a heat-insulating shell, a heating plate is arranged inside the heat-insulating shell, and the heating plate divides the interior of the heat-insulating shell into an upper cavity and a lower cavity; A silicone oil and a heater for heating the silicone oil are arranged in the lower cavity; The upper cavity is communicated with a paraformaldehyde storage box, and a flow control valve for controlling the flow of paraformaldehyde into the upper cavity is arranged between the paraformaldehyde storage box and the upper cavity; An air outlet and an air inlet communicating with the outside are arranged in the upper space; the air outlet is communicated with the air supply three-way valve; the air inlet is communicated with the return air three-way valve.

[0009] Preferably, the absorption tank includes: a tank body, an air inlet arranged at the bottom of the shell, and a reflux cavity arranged inside the tank body; an air outlet is arranged at the top of the tank body.

[0010] Preferably, an air equalizing pipe is arranged at a position corresponding to the air inlet inside the tank body.

[0011] Preferably, the heat-insulating shell is cylindrical, an installation shaft is arranged at the axis position of the heat-insulating shell, a central hole is penetrated through the center position of the heating plate, and the central hole is rotationally matched with the installation shaft; a hollow ring is sleeved on the installation shaft, and the hollow ring floats upward under the buoyancy of the silicone oil and abuts against the bottom of the heating plate; a plurality of fan plates are arranged in the circumferential direction of the heating plate along its radial direction, the connection line between the air outlet and the air inlet is L, the radius of the heating plate is R, and the perpendicular distance from the installation shaft to L is D, and the size of D is between R / 4 and 3R / 4.

[0012] Preferably, a convex ring is arranged at the edge of the heating plate.

[0013] The present application also provides an experimental space, which includes the above-mentioned biosafety terminal disinfection and sterilization device, and also includes an experimental space inlet and an experimental space outlet that are communicated with the biosafety experimental space; the experimental space inlet is connected to the air outlet interface, and the experimental space outlet is communicated with the return air interface.

[0014] The setting of the return air interface facilitates the connection with the experimental space inlet. The setting of the air outlet interface facilitates the connection with the experimental space outlet.

[0015] Preferably, it also includes a sensor arranged in the experimental space.

[0016] Preferably, it also includes a wall panel cleaning robot arranged in the experimental space.

[0017] Compared with the prior art, the beneficial effects of the present invention are: by setting the above structure, by switching the air supply three-way valve and the return air three-way valve, the switching between the disinfection working condition and the formaldehyde residue adsorption working condition can be realized. Under the disinfection working condition, the formaldehyde gas in the formaldehyde generator can enter the experimental space to disinfect the interior of the experimental space. After the disinfection is completed, it enters the formaldehyde residue adsorption working condition. Under this working condition, the residual formaldehyde gas in the experimental space can be sucked out. After the residual formaldehyde gas passes through the absorption tank, the formaldehyde gas is absorbed by the absorption tank in the absorption tank and then discharged into the air to achieve the rapid elimination of formaldehyde gas.

[0018] Therefore, the present application can utilize the oxidation-reduction principle to recover the excess formaldehyde after disinfecting and sterilizing the biosafety experimental space with formaldehyde, ensure that all the residual formaldehyde is removed, ensure that there is no formaldehyde residue, and there will be no secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the present invention.

[0020] Figure 2 is the structural schematic diagram of the absorption tank of the present invention.

[0021] Figure 3 is the structural schematic diagram of the formaldehyde generator of the present invention.

[0022] Figure 4 is the schematic diagram of the disinfection working condition of the present invention.

[0023] Figure 5 is the schematic diagram of the formaldehyde residue adsorption working condition of the present invention.

[0024] Figure 6 is the structural schematic diagram of the formaldehyde generator in Embodiment 3 of the present invention.

[0025] Figure 7 is the Figure 6 cross-sectional view taken along the A-A direction in the present invention. Detailed Implementation Modes

[0026] The following will further specifically describe the technical solution of the present invention through specific embodiments in conjunction with the accompanying drawings: Embodiment 1: As shown in Figures 1 to 5 FIG., a terminal disinfection and sterilization device includes: an air supply three-way valve 8, a return air three-way valve 11, and a formaldehyde generator 4; it further includes a control system 12 for controlling the terminal disinfection and sterilization device and a sensor 13 disposed in the biosafety space 5.

[0027] The three interfaces of the air supply three-way valve 8 are respectively communicated with the fresh air pipe 161, the air supply pipe 162, and the outlet of the formaldehyde generator 4; the three interfaces of the return air three-way valve 3 are respectively communicated with the recovery pipe 164, the return air pipe 163, and the inlet of the formaldehyde generator 4; The end of the air supply pipe 162 is provided with an air outlet interface 141 communicated with the experimental space 5, and an air supply fan 2 is provided on the air supply pipe 162; the end of the return air pipe 163 is provided with an air return interface 142 communicated with the experimental space 5, and a return air fan 3 is provided on the return air pipe 163; the end of the recovery pipe 164 far from the return air three-way valve 11 is communicated with the air inlet 75 of the absorption tank 7.

[0028] As shown in Figure 3 FIG., the formaldehyde generator 4 includes a heat preservation housing 47, a heating plate 43 is disposed in the heat preservation housing 47, and the heating plate 43 divides the interior of the heat preservation housing 47 into an upper cavity and a lower cavity; A silicone oil 42 and a heater 41 for heating the silicone oil 42 are disposed in the lower cavity; The upper cavity is communicated with a paraformaldehyde storage box 48, and a flow control valve 49 for controlling the flow of paraformaldehyde into the upper cavity is disposed between the paraformaldehyde storage box 48 and the upper cavity; The upper space is provided with an air outlet 44 and an air inlet 46 communicated with the outside; the air outlet 44 is communicated with the air supply three-way valve 8; the air inlet 46 is communicated with the return air three-way valve 11. The upper space is provided with a paraformaldehyde outlet 40, and the paraformaldehyde in the paraformaldehyde storage box 48 enters the upper cavity from the paraformaldehyde outlet 40.

[0029] As shown in Figure 2 FIG., the absorption tank 7 includes: a tank body 74, an air inlet 75 disposed at the bottom of the housing, and a reflux cavity 72 disposed in the tank body 74; an air outlet 76 is provided at the top of the tank body 74. An adsorption liquid 73 for adsorbing formaldehyde is disposed in the tank body 74. The tank body 74 is made of stainless steel material. The gas is discharged from the air outlet 76 after passing through the reflux cavity 75, and an air equalizing pipe 71 is disposed at a position corresponding to the air inlet 75 in the tank body 74.

[0030] The working principle of the absorption tank 7 is as follows: The waste gas enters from the air inlet 75, first forms uniform bubbles at the air distribution pipe 71, the bubbles pass through the adsorption liquid 73, and reciprocate in the reflux cavity 72. The waste gas with the maximum flow path acts on the adsorption liquid 73, reducing the formaldehyde content in the waste gas at the air outlet 76 to below the allowable value, and then is discharged through the air outlet 76.

[0031] A fresh air filter 9 is provided on the fresh air pipe 161.

[0032] The working principle of this application is as follows: Before using the terminal disinfection and sterilization device, first connect the air outlet interface 141 to the experimental space 5, then connect the air return interface 142 to the experimental space 5, and then set the sensor 13 in the experimental space 5. This application includes two working conditions, namely the disinfection working condition and the formaldehyde residue adsorption working condition; specifically: Disinfection working condition (as Figure 4 shown): According to the volume of the experimental space 5, control the flow rate of the flow control valve 49, automatically put the amount of paraformaldehyde in the paraformaldehyde storage box 48, and the paraformaldehyde drips onto the heating plate 43. The heater 41 heats the silicone oil, and the silicone oil makes the heating plate 43 heat up and controls the silicone oil to be heated to the set temperature. The paraformaldehyde dripping on the heating plate 43 smokes, and control the return air fan 3 and the supply air fan 2 to start running. Control the supply air three-way valve 8 to connect the air outlet 44 of the formaldehyde generator to the supply air pipe 162. Control the return air three-way valve 11 to connect the air inlet 46 of the generator 4 to the return air pipe 163. Therefore, the flow direction of the formaldehyde gas at this time is in turn: formaldehyde generator 4 - supply air three-way valve 8 - supply air pipe 162 - supply air fan 2 - air outlet interface 141 - experimental space 5 - air return interface 142 - return air fan 3 - return air pipe 163 - return air three-way valve 11, and finally return to the formaldehyde generator 4 through the air inlet 46. The control system 12 controls the cycle time. After the sensor 13 detects that the formaldehyde gas concentration in the experimental space 5 reaches the set value, it starts timing. When the timing time arrives, the disinfection working condition ends.

[0033] In this process, the sensor 13 detects the air pressure in the disinfection space 5, controls the frequencies of the supply air fan 2 and the exhaust fan 3, and always controls the air pressure in the experimental space 5 to be negative pressure.

[0034] Formaldehyde residue adsorption working condition (as Figure 5As shown in the figure: Turn off the heater 41 of the formaldehyde generator 4. Control the air supply three-way valve 8 to connect the fresh air pipe 161 and the air supply pipe 162. Control the return air three-way valve 11 to connect the return air pipe 163 and the recovery pipe 164. At this time, the direction of the air flow is: The outside air enters from the fresh air inlet 10 - fresh air filter 9 - fresh air pipe 161 - air supply three-way valve 8 - air supply pipe 162 - air supply fan 2 - air outlet interface 141 - experimental space 5 - air return interface 142 - air return fan 3 - return air pipe 163 - return air three-way valve 11 - recovery pipe 164 - absorption tank 7. The waste gas flows into the tank body 74 from the air inlet 75 of the absorption tank 7, is adsorbed in the reflux chamber 72, and then is discharged from the air outlet 76 of the tank body 74, and finally is discharged from the waste gas interface 143. The sensor 13 detects the concentration of formaldehyde gas. When the lower limit value is reached, the formaldehyde residue adsorption working condition ends. Control the wall panel cleaning robot 6 to start running and start wiping the wall to clean the remaining formaldehyde gas. Thus, the disinfection work of the disinfection space is all completed.

[0035] Embodiment 2: Refer to Figures 1 to 5 As shown in the figure, an experimental space includes the above-mentioned biological safety terminal disinfection and sterilization device, and also includes an experimental space inlet 151 and an experimental space outlet 152 communicated with the experimental space 5; the experimental space inlet 151 is connected to the air outlet interface 141, and the experimental space outlet 152 is communicated with the air return interface 142.

[0036] The setting of the air return interface 142 facilitates the connection with the experimental space inlet 151. The setting of the air outlet interface 141 facilitates the connection with the experimental space outlet 152.

[0037] The wall panel cleaning robot 6 of the experimental space. The wall panel cleaning robot 6 can automatically clean the inner wall of the experimental space.

[0038] Embodiment 3: Refer to Figure 6 and Figure 7 As shown in the figure, the structure of this embodiment is similar to that in Embodiment 1 or Embodiment 2. The difference is that the heat preservation housing 47 is cylindrical, and an installation shaft 471 is arranged at the axis position of the heat preservation housing 47. A central hole 431 is penetrated through the center position of the heating plate 43, and the central hole 431 is rotationally matched with the installation shaft 471; a hollow ring 472 is sleeved on the installation shaft 471, and the hollow ring floats upward under the buoyancy of silicone oil and abuts against the bottom of the heating plate 43 to support the heating plate 43; a plurality of fan plates 432 are arranged in the circumferential direction of the heating plate 43 along its radial direction. The connection line between the air outlet 44 and the air inlet 46 is L, the radius of the heating plate is R, and the perpendicular distance from the installation shaft 471 to L is D. The size of D is between R / 4 and 3R / 4. In this embodiment, D is R / 2.

[0039] In this embodiment, a hollow ring 472 is sleeved on the mounting shaft 471. The hollow ring 472 floats upward under the action of the buoyancy of the silicone oil, and plays a supporting role for the heating plate 43. The buoyancy received by the hollow ring 472 cooperates with the gravity of the heating plate 43, so that the heating plate 43 can just maintain the state of contacting with the silicone oil, and at the same time, the upper end surface of the heating plate 43 is located above the silicone oil, so that as the evaporation of the silicone oil decreases, the heating plate 43 can always maintain the best contact state with the silicone oil. When the wind enters the heat preservation housing 47 from the air inlet 46 and then flows out from the air outlet 44, the wind can act on the fan plate 432, blowing the fan plate 432 to rotate around the mounting shaft 471. The paraformaldehyde outlet 40 is eccentrically arranged above the heating plate 43. Therefore, with the action of the wind, the paraformaldehyde can be evenly dripped on the upper end surface of the heating plate 43, so that the plane on the heating plate 43 can be fully utilized to heat the paraformaldehyde. And with the rotation of the heating plate 43, the heating of the heating plate 43 can be more uniform, thereby improving the utilization rate of paraformaldehyde and the production efficiency of formaldehyde. In addition, the fan plate 432 can also conduct heat, and the paraformaldehyde dripped on the fan plate 432 can also be heated to form formaldehyde, further improving the production efficiency of formaldehyde. A convex ring 433 is arranged at the edge of the upper end surface of the heating plate 43 to prevent the paraformaldehyde from dripping into the silicone oil.

[0040] The above-described embodiments are only preferred solutions of the present invention, and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. A biological safety terminal disinfection and sterilization device, characterized in that, Including: A supply air three-way valve, a return air three-way valve, and a formaldehyde generator; The three interfaces of the supply air three-way valve are respectively connected to the fresh air pipe, the supply air pipe, and the outlet of the formaldehyde generator; The three interfaces of the return air three-way valve are respectively connected to the recovery pipe, the return air pipe, and the inlet of the formaldehyde generator; An air outlet interface communicating with the experimental space is provided at the end of the supply air pipe, and a supply air fan is provided on the supply air pipe; An air return interface communicating with the experimental space is provided at the end of the return air pipe, and a return air fan is provided on the return air pipe; The end of the recovery pipe far from the return air three-way valve is connected to the air inlet of the absorption tank.

2. The biosafety terminal disinfection and sterilization device according to claim 1, wherein, The formaldehyde generator includes a heat preservation housing, a heating plate is arranged in the heat preservation housing, and the heating plate divides the interior of the heat preservation housing into an upper cavity and a lower cavity; A silicone oil and a heater for heating the silicone oil are arranged in the lower cavity; The upper cavity is connected to a paraformaldehyde storage box, and a flow control valve for controlling the flow of paraformaldehyde into the upper cavity is arranged between the paraformaldehyde storage box and the upper cavity; An air outlet and an air inlet communicating with the outside are arranged in the upper space; the air outlet is connected to the supply air three-way valve; the air inlet is connected to the return air three-way valve.

3. The biosafety terminal disinfection and sterilization device according to claim 1, wherein The absorption tank includes: a tank body, an air inlet arranged at the bottom of the housing, and a reflux cavity arranged in the tank body; an air outlet is arranged at the top of the tank body.

4. The biosafety terminal disinfection and sterilization device according to claim 3, characterized in that, An air distribution pipe is arranged at a position corresponding to the air inlet in the tank body.

5. The biosafety terminal disinfection and sterilization device according to any one of claims 1 to 4, characterized in that, A fresh air filter is arranged on the fresh air pipe.

6. The biosafety terminal disinfection and sterilization device according to claim 2, characterized in that, The heat preservation housing is cylindrical, an installation shaft is arranged at the axis position of the heat preservation housing, a central hole is penetrated through the center position of the heating plate, and the central hole is rotationally matched with the installation shaft; a hollow ring is sleeved on the installation shaft, and the hollow ring floats upward under the buoyancy of the silicone oil and abuts against the bottom of the heating plate; a plurality of fan plates are arranged in the circumferential direction of the heating plate along its radial direction, the connection line between the air outlet and the air inlet is L, the radius of the heating plate is R, the perpendicular distance from the installation shaft to L is D, and the size of D is between R / 4 and 3R / 4.

7. The biosafety terminal disinfection and sterilization device according to claim 6, characterized in that, A convex ring is arranged at the edge of the heating plate.

8. An experimental space, characterized in that, Including the biological safety terminal disinfection and sterilization device according to any one of claims 1 to 7, further including an experimental space inlet and an experimental space outlet communicating with the biological safety experimental space; the experimental space inlet is connected to the air outlet interface, and the experimental space outlet is connected to the air return interface.

9. The experimental space according to claim 8, characterized in that, Further including a sensor arranged in the experimental space.

10. The experimental space according to claim 8, characterized in that, Further including a wall panel cleaning robot arranged in the experimental space.

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