A hydrogen peroxide gas sterilization system

Abstract

The application discloses a hydrogen peroxide gas sterilization system, which comprises a liquid storage tank, a liquid inlet main pipe connected to the liquid storage tank, an overflow assembly connected to the liquid storage tank through an overflow pipeline, the overflow assembly being capable of being used for pump calibration, an evaporator connected to the liquid storage tank through an injection pipeline, the injection pipeline being provided with an injection metering pump, the evaporator being provided with an exhaust pipe for discharging hydrogen peroxide gas, and a fan connected to the evaporator through an air inlet pipeline and used for blowing out the hydrogen peroxide gas generated by the evaporator. The hydrogen peroxide liquid is extracted from the liquid storage tank by the injection metering pump and is gasified on the evaporator, and then is discharged for sterilization. Therefore, in order to ensure the accuracy of the extraction quantity, the metering pump needs to be calibrated. During the calibration, the metering pump can be calibrated by extracting the liquid to the overflow assembly, and the calibration can be performed without disassembly. Meanwhile, the overflow assembly can also play an overflow role, so that the liquid cannot overflow to the outside and cause pollution.

Description

Technical Field

[0001] This invention relates to the field of sterilization system technology, and more particularly to a hydrogen peroxide gas sterilization system. Background Technology

[0002] In the fields of medical care, biopharmaceuticals, food processing, and laboratories, sterilization is a core step in ensuring product quality, public health safety, and experimental accuracy. Its core requirement is to efficiently kill various microorganisms, including bacterial spores, viruses, and prions, while also taking into account the safety, environmental friendliness, and compatibility with the objects being sterilized, so as to avoid damage to equipment, materials, and operators.

[0003] In the hydrogen peroxide sterilization process, liquid hydrogen peroxide is typically drawn from a storage tank into an evaporator. The evaporator heats and evaporates the liquid hydrogen peroxide into gas, which is then blown out by a fan for sterilization. When drawing liquid hydrogen peroxide from the storage tank to the evaporator, a metering pump is used for extraction and delivery. The metering pump not only delivers the liquid but also measures its quantity, achieving quantitative delivery. However, the metering pump needs to be calibrated periodically to maintain its accuracy and ensure precise delivery of the hydrogen peroxide liquid. Calibration usually requires disassembling the metering pump, a complex and cumbersome process that also necessitates stopping the sterilization system, disrupting the production flow. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a hydrogen peroxide gas sterilization system.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A hydrogen peroxide gas sterilization system includes a liquid storage tank, the liquid storage tank being connected to a liquid inlet main pipe;

[0007] An overflow assembly, connected to the liquid storage tank via an overflow pipe, is used for pump calibration;

[0008] An evaporator is connected to the liquid storage tank via an injection pipe, the injection pipe being equipped with an injection metering pump, and the evaporator being equipped with an exhaust pipe for the discharge of hydrogen peroxide gas.

[0009] A fan, connected to the evaporator via an air inlet duct, is used to blow out the hydrogen peroxide gas produced by the evaporator.

[0010] Preferably, a calibration pipe is connected to the injection pipe, one end of which is connected to the overflow assembly, and the calibration pipe is located at the rear end of the injection metering pump.

[0011] Preferably, the overflow assembly includes a fixed box, a weighing sensor is installed inside the fixed box, an overflow tank is installed on the weighing sensor, and the overflow pipe and the verification pipe are connected to the overflow tank.

[0012] Preferably, a breathing valve is provided on the top of the fixed box to maintain the same air pressure inside and outside the fixed box.

[0013] Preferably, a recovery pipe is provided between the injection pipe and the liquid storage tank for recovering residual liquid in the pipe.

[0014] Preferably, there are two liquid storage tanks, each of which is connected to an inlet branch pipe, and both inlet branch pipes are connected to the main inlet pipe; each of the two liquid storage tanks is connected to the evaporator by an injection pipe, and each injection pipe is connected to the overflow assembly by a verification pipe.

[0015] Preferably, the liquid storage tank is equipped with a high-level switch and a low-level switch to control the liquid level inside the liquid storage tank.

[0016] Preferably, a preheater is provided on the air inlet duct, the preheater being located between the fan and the evaporator, for heating the airflow blown out by the fan.

[0017] Preferably, an air filter and a dehumidifier are provided on the air intake duct, and the air filter and the dehumidifier are located at the front end of the fan for filtering and dehumidifying the air.

[0018] Preferably, the main inlet pipe is equipped with a hydrogen peroxide filter for filtering the hydrogen peroxide liquid.

[0019] The beneficial effects of adopting the above technical solution are as follows:

[0020] 1. In this invention, in the hydrogen peroxide gas sterilization system, liquid hydrogen peroxide is stored in a liquid storage tank. A metering pump draws the liquid hydrogen peroxide from the storage tank and delivers it to an evaporator. The evaporator heats the hydrogen peroxide gas into steam, which is then discharged for sterilization. The liquid in the evaporator is connected to an overflow tank via an overflow pipe, allowing excess liquid in the storage tank to overflow into the overflow tank, ensuring a normal liquid level. Furthermore, if calibration of the metering pump is required, liquid hydrogen peroxide can be directly drawn into the overflow tank using the metering pump. A weighing sensor weighs the liquid hydrogen peroxide in the overflow tank, and the resulting data is compared with the metering pump data to calibrate the metering pump. The calibration process does not require disassembly of the metering pump or shutdown, making the metering process simpler and more convenient.

[0021] 2. In this invention, there are two liquid storage tanks, which are set up separately. Each liquid storage tank is connected to the overflow component and the evaporator separately through a pipeline. Therefore, during use, real-time switching can be performed. If a problem occurs in one liquid storage tank, it can be switched to the other liquid storage tank to avoid the sterilization system from shutting down. Attached Figure Description

[0022] Figure 1 This is a system diagram of the present invention;

[0023] Figure 2 This is a three-dimensional schematic diagram of the overflow component of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the fixed box of the present invention.

[0025] In the diagram: 1 is the liquid storage tank, 2 is the main inlet pipe, 3 is the overflow assembly, 4 is the overflow pipe, 5 is the evaporator, 6 is the injection pipe, 7 is the exhaust pipe, 8 is the fan, 9 is the air inlet pipe, 10 is the injection metering pump, 11 is the calibration pipe, 12 is the fixed box, 13 is the load cell, 14 is the overflow tank, 15 is the inlet branch pipe, 16 is the high level switch, 17 is the low level switch, 18 is the preheater, 19 is the air filter, 20 is the dehumidifier, 21 is the hydrogen peroxide filter, 22 is the liquid addition pump, 23 is the first valve, 24 is the first tee connector, 25 is the second valve, 26 is the second tee connector, 27 is the third valve, 28 is the liquid level sensor, 29 is the preheater temperature sensor, 30 is the flow sensor, 31 is the temperature sensor, 32 is the humidity sensor, 33 is the injection head, 34 is the evaporator heating rod, and 35 is the breather valve. Detailed Implementation

[0026] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] like Figure 1 As shown, a hydrogen peroxide gas sterilization system includes a liquid storage tank 1 for storing liquid hydrogen peroxide. A liquid inlet pipe 2 is connected to the liquid storage tank 1, and a liquid inlet pump 22 and a first valve 23 are installed on the liquid inlet pipe 2. The liquid storage tank 1 is connected to an overflow assembly 3 via an overflow pipe 4. When there is too much liquid hydrogen peroxide in the liquid storage tank 1, it can be transported to the overflow assembly 3 through the overflow pipe 4, preventing the liquid storage tank 1 from bursting due to increased pressure caused by excessive liquid. The overflow assembly also has a calibration function to calibrate the pump and ensure its accuracy. The liquid storage tank 1 is connected to an evaporator 5 via an injection pipe 6, and an injection metering pump 10 is installed on the injection pipe 6. An exhaust pipe 7 is installed on the evaporator 5 to discharge the hydrogen peroxide vapor generated by the evaporator 5 for sterilization. The evaporator 5 is also connected to an air supply pipe 9, and the airflow generated by the fan 8 can blow the hydrogen peroxide gas generated by the evaporator 5 out through the exhaust pipe 7.

[0030] In this invention, hydrogen peroxide liquid is drawn by the liquid pump 22 and transported to the liquid storage tank 1 through the liquid inlet pipe 2. The hydrogen peroxide liquid is stored in the liquid storage tank 1. The first valve 23 is used to control the opening and closing of the liquid inlet pipe 2. When too much hydrogen peroxide liquid enters the liquid storage tank 1, the excess liquid can enter the overflow assembly 3 through the overflow pipe 4 to prevent the liquid from overflowing from the liquid storage tank 1. When using the hydrogen peroxide liquid, the hydrogen peroxide liquid in the liquid storage tank 1 can be transported to the evaporator 5 through the injection pipe 6. The injection pipe 6 is equipped with an injection metering pump 10, which can extract the hydrogen peroxide liquid in the liquid storage tank 1. The injection metering pump also has a metering function and can accurately extract a set amount of liquid. After the hydrogen peroxide liquid is transported to the evaporator 5, the evaporator heats the hydrogen peroxide liquid to evaporate into hydrogen peroxide gas and discharge it from the exhaust pipe 7 for sterilization and disinfection. The airflow generated by the fan 8 is transported to the evaporator 5 through the air inlet pipe 9, which can accelerate the discharge speed of hydrogen peroxide gas.

[0031] In one embodiment of the present invention, an injection metering pump 10 is provided on the injection pipeline 6 for conveying hydrogen peroxide liquid in the liquid storage tank 1 to the evaporator 5, and also for measuring the weight of the extracted liquid to ensure accurate liquid delivery; a verification pipeline 11 is connected to the injection pipeline 6, one end of which is connected to the overflow assembly 3, and the verification pipeline 11 is located at the rear end of the injection metering pump 10; in this embodiment, the injection metering pump 10 extracts hydrogen peroxide liquid from the liquid storage tank 1 and delivers it to the evaporator 5 through the injection pipeline 6 for vaporization. While delivering liquid, the metering pump 10 also has a metering function, which can accurately control the amount of liquid delivered. However, the metering pump 10 needs to be calibrated after a period of use to avoid errors in accuracy. The overflow component 3 in this application has a calibration function. Therefore, hydrogen peroxide liquid can be delivered to the overflow component 3 through the calibration pipe 11 via the metering pump 10 for calibration to determine whether the metering pump 10 is accurate. The connection between the calibration pipe 11 and the injection pipe 6 is located at the rear end of the metering pump 10, so the metering pump 10 can deliver liquid to the calibration pipe 11.

[0032] It should be noted that a first tee connector 24 is provided on the injection pipe 11 at the rear end of the injection metering pump 10. One end of the calibration pipe 11 is connected to the first tee connector 24, and the other end is connected to the overflow assembly 3. A second valve 25 is provided on the injection pipe 6 at the rear end of the first tee connector 24. When calibrating the injection metering pump 10, the second valve 25 is closed, and the injection metering pump 10 can completely draw the liquid in the liquid storage tank 1 into the overflow assembly 3. By comparing the liquid data in the overflow assembly 3 with the liquid delivery data in the injection metering pump 10, it can be determined whether the injection metering pump 10 is accurate.

[0033] Furthermore, an on / off valve is installed on the verification pipeline 11 to control the on / off state of the verification pipeline 11. The on / off valve is opened during verification and closed during normal operation.

[0034] refer to Figure 2 and Figure 3As shown, in one embodiment of the present invention, the overflow assembly includes a fixed box 12, a weighing sensor 13 is provided at the bottom of the fixed box 12, an overflow tank 14 is provided on the weighing sensor 13, and an overflow pipe 4 and a calibration pipe 11 are connected to the overflow tank 14. In this embodiment, when there is too much liquid in the liquid storage tank 1, it can enter the overflow tank 14 through the overflow pipe 4. When calibrating the injection metering pump 10, the liquid is transported to the overflow tank 14 through the calibration pipe 11. After the liquid enters the overflow tank 14, its weight increases, and the weighing sensor 13 can weigh it. The obtained weight is the weight of the liquid in the overflow tank 14. By observing the weight detected by the weighing sensor 13 and comparing it with the delivery volume of the injection metering pump 10, it can be determined whether the injection metering pump 10 is accurate. Calibration can be performed without disassembling the injection metering pump 10, making the calibration process simpler and more convenient.

[0035] It should be noted that the fixed box 12 is a sealed box with a door hinged to the front side. The door is made of a transparent material, such as glass, allowing direct observation of the contents of the fixed box 12. The overflow tank 14 is an open bottle with the overflow pipe 4 and the output ends of the calibration pipe 11 both extend to the top of the overflow tank 14 inside the fixed box 12, allowing the output liquid to fall directly into the overflow tank 14. A fixed rod is also fixedly installed inside the fixed box 12, and a bracket is fixedly installed on the fixed rod. The bracket has an arc-shaped structure that wraps around the overflow tank 14 to prevent it from tipping over. A gap is left between the bracket and the side wall of the overflow tank 14 to avoid affecting the balance. The overflow tank 14 can be placed and removed through the notch in the bracket.

[0036] In one embodiment of the present invention, a breathing valve 35 is provided on the top of the fixed box 12 to maintain the same air pressure inside and outside the fixed box 12.

[0037] In one embodiment of the present invention, a recovery pipe 14 is provided between the injection pipe 6 and the liquid storage tank 1 for the recovery of residual liquid in the pipe; in this embodiment, when sterilization is completed or the system is under maintenance, in order to avoid the liquid remaining in the pipe from corroding the pipe, the liquid in the pipe can be returned to the liquid storage tank 1 by providing the recovery pipe 14.

[0038] It should be noted that a second tee connector 26 is provided on the injection pipe 6 at the rear end of the second valve 25. One end of the recovery pipe 14 is connected to the second tee connector 26, and the other end is connected to the liquid storage tank 1, so that the liquid can flow back into the liquid storage tank 1.

[0039] In one embodiment of the present invention, two liquid storage tanks 1 are provided, and each of the two liquid storage tanks 1 is connected to an inlet branch pipe 15. Both inlet branch pipes 15 are connected to the main inlet pipe 2. Both liquid storage tanks 1 are connected to the evaporator 5 by an injection pipe 6, and both injection pipes 6 and overflow assembly 3 are connected by a check pipe 6. In this embodiment, a third valve 27 is provided on the inlet branch pipe 15 to control the opening and closing of the inlet branch pipe 15. By setting two sets of liquid storage tanks 1, maintenance can be carried out without stopping the machine, so that the sterilization work can continue.

[0040] In one embodiment of the present invention, a high-level switch 16 and a low-level switch 17 are provided on the liquid storage tank 1 to control the liquid level in the liquid storage tank 1; when the liquid level in the liquid storage tank 1 touches the high-level switch 16, the delivery of liquid into the liquid storage tank 1 is stopped; when the liquid level in the liquid storage tank 1 touches the low-level switch 17, the delivery of liquid into the liquid storage tank 1 begins; the overflow component is used when the high-level switch 16 fails or the delivery speed is too fast, thereby improving the safety of the system.

[0041] It should be noted that a liquid level sensor 28 is also installed on the liquid storage tank 1, which can monitor the liquid level height in the liquid storage tank 1 in real time.

[0042] In one embodiment of the present invention, a preheater 18 is provided on the air inlet duct 9. The preheater 18 is located between the fan 8 and the evaporator 5 and is used to heat the airflow blown out by the fan 8. In this embodiment, the airflow blown out by the fan 8 flows into the evaporator 5 through the air inlet duct 9. During the flow, the airflow is heated by the preheater 18, which raises the airflow temperature. When the airflow blows out the hydrogen peroxide gas generated by the evaporator 5, it can prevent the hydrogen peroxide gas temperature from dropping and condensing into liquid, thereby enhancing the sterilization effect.

[0043] It should be noted that a preheater temperature sensor 29 is installed on the preheater 18, which can monitor the temperature of the preheater 18 in real time; and a flow sensor 30 is installed on the air intake pipe 9, which can monitor the gas flow rate in the pipe.

[0044] In one embodiment of the present invention, an air filter 19 and a dehumidifier 20 are provided on the air intake pipe 9. The air filter 19 and the dehumidifier 20 are located at the front end of the fan 8 and are used to filter the air and dehumidify the air.

[0045] It should be noted that a temperature sensor 31 and a humidity sensor 32 are also installed on the air intake pipe 9. The temperature sensor 31 and the humidity sensor 32 are located at the front end of the fan 8 and are used to monitor the temperature and humidity of the intake air.

[0046] In one embodiment of the present invention, a hydrogen peroxide filter 21 is provided on the liquid inlet pipe 2 for filtering the hydrogen peroxide liquid to ensure the cleanliness of the peroxide liquid.

[0047] Furthermore, the evaporator 5 includes an injection head 32 connected to an injection pipe, and an evaporator heating rod 33 is provided on the evaporator 5. The injection head 32 faces the evaporator heating rod 33. After the hydrogen peroxide liquid sprayed through the injection head 32 falls onto the evaporator heating rod 33, the evaporator heating rod 33 heats the liquid, causing it to evaporate rapidly into gas and be discharged through the exhaust pipe 7.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen peroxide gas sterilization system, characterized in that, Includes a liquid storage tank (1), on which a liquid inlet pipe (2) is connected; An overflow assembly (3) is connected to the liquid storage tank (1) via an overflow pipe (4), and the overflow assembly (3) can be used for pump calibration; An evaporator (5) is connected to the liquid storage tank (1) via an injection pipe (6). An injection metering pump (10) is installed on the injection pipe (6). An exhaust pipe (7) is installed on the evaporator (5) for the discharge of hydrogen peroxide gas. A fan (8) is connected to the evaporator (5) via an air inlet pipe (9) and is used to blow out the hydrogen peroxide gas generated by the evaporator (5).

2. The hydrogen peroxide gas sterilization system according to claim 1, characterized in that, The injection pipe (6) is connected to a verification pipe (11), one end of which is connected to the overflow assembly (3), and the verification pipe (11) is located at the rear end of the injection metering pump (10).

3. The hydrogen peroxide gas sterilization system according to claim 2, characterized in that, The overflow assembly includes a fixed box (12), a weighing sensor (13) is installed inside the fixed box (12), an overflow tank (14) is installed on the weighing sensor (13), and the overflow pipe (4) and the verification pipe (11) are connected to the overflow tank (14).

4. The hydrogen peroxide gas sterilization system according to claim 3, characterized in that, The top of the fixed box (12) is provided with a breathing valve (35) to maintain the same air pressure inside and outside the fixed box (12).

5. The hydrogen peroxide gas sterilization system according to claim 1, characterized in that, A recovery pipe (14) is provided between the injection pipe (6) and the liquid storage tank (1) for the recovery of residual liquid in the pipe.

6. The hydrogen peroxide gas sterilization system according to claim 1, characterized in that, Two liquid storage tanks (1) are provided, and each of the two liquid storage tanks (1) is connected to an inlet branch pipe (15). Both of the inlet branch pipes (15) are connected to the inlet main pipe (2). Both liquid storage tanks (1) are connected to the evaporator (5) by an injection pipe (6). Both the injection pipe (6) and the overflow assembly (3) are connected by a verification pipe (6).

7. The hydrogen peroxide gas sterilization system according to claim 1, characterized in that, The liquid storage tank (1) is equipped with a high liquid level switch (16) and a low liquid level switch (17) to control the liquid level in the liquid storage tank (1).

8. The hydrogen peroxide gas sterilization system according to claim 1, characterized in that, A preheater (18) is provided on the air inlet duct (9). The preheater (18) is located between the fan (8) and the evaporator (5) and is used to heat the airflow blown out by the fan (8).

9. The hydrogen peroxide gas sterilization system according to claim 1, characterized in that, An air filter (19) and a dehumidifier (20) are provided on the air intake pipe (9). The air filter (19) and the dehumidifier (20) are located at the front end of the fan (8) and are used to filter the air and dehumidify the air.

10. A hydrogen peroxide gas sterilization system according to claim 1, characterized in that, The liquid inlet pipe (2) is equipped with a hydrogen peroxide filter (21) for filtering hydrogen peroxide liquid.

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