Nitrogen making equipment for ethylene oxide sterilizer

Abstract

The utility model provides nitrogen making equipment for an ethylene oxide sterilizer, which comprises an air compressor, an air buffer tank and a freezing dryer which are sequentially communicated, the air buffer tank is sequentially communicated, and the tail end of the air buffer tank is communicated with the air inlet end of a nitrogen making machine; the nitrogen making machine is used for completing preparation of nitrogen, the nitrogen making machine is communicated with the nitrogen buffer tank, the nitrogen buffer tank is respectively communicated with the nitrogen replacement storage tank and the door seal nitrogen storage tank, and nitrogen in the nitrogen replacement storage tank enters the sterilizer after passing through the dosing pipeline and the vaporizer; nitrogen in the door seal nitrogen storage tank is connected with a gas control box on the sterilizer, and supply of gas on the door seal and the gas using point is guaranteed through opening and closing of an electromagnetic valve in the gas control box. The independent door seal nitrogen storage tank is used for controlling, nitrogen supply is guaranteed, the service life of a door seal and pneumatic components is prolonged, meanwhile, sufficient release of nitrogen in the nitrogen replacement storage tank is guaranteed, and convenience and practicability are achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of nitrogen generation equipment, specifically relating to a nitrogen generation device for an ethylene oxide sterilizer. Background Technology

[0002] Ethylene oxide (EO) gas is flammable and explosive, and directly introducing it into the sterilizer poses a safety hazard. By covering it with nitrogen inert gas, the concentration of EO gas inside the sterilizer cabinet is kept below the lower explosive limit. Moreover, after adding EO, there will be adhesion or residue in the pipeline, which is difficult to remove over time. All pneumatic components on the sterilizer, especially the air-filled door seal (made of silicone), are made of nitrogen, which helps to extend the service life of the parts.

[0003] Based on this, a nitrogen generation device for ethylene oxide sterilizers is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a nitrogen generator for an ethylene oxide sterilizer, in order to address the shortcomings of the prior art mentioned above.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a nitrogen generating device for an ethylene oxide sterilizer, comprising an air compressor, an air buffer tank, a refrigerated dryer, an air buffer tank, a nitrogen generator, a nitrogen buffer tank, a nitrogen replacement storage tank, a door-sealed nitrogen storage tank, and a sterilizer;

[0006] The air compressor, air buffer tank, refrigerated dryer, and air buffer tank are connected in sequence, and the tail end of the air buffer tank is connected to the air inlet of the nitrogen generator.

[0007] The nitrogen generator is used to prepare nitrogen. The nitrogen generator is connected to the nitrogen buffer tank. The nitrogen buffer tank is connected to the nitrogen replacement storage tank and the door-sealed nitrogen storage tank. The nitrogen in the nitrogen replacement storage tank enters the sterilizer through the dosing pipeline and the vaporizer.

[0008] The nitrogen in the nitrogen storage tank of the door seal is connected to the gas control box on the sterilizer. The gas supply to the door seal and the gas usage point is ensured by opening and closing the solenoid valve in the gas control box.

[0009] As a further explanation of this utility model, impurity filters are respectively connected to the connecting pipes between the refrigerated dryer and the air buffer tank, and an activated carbon micro-oil mist filter is connected between the air buffer tank and the nitrogen generator.

[0010] As a further explanation of this utility model, the nitrogen generator is a PSA variable pressure nitrogen generator, and the purity of the nitrogen gas produced is 99.9%-99.999%.

[0011] As a further explanation of this utility model, the nitrogen generator is also connected to a touch screen control panel.

[0012] As a further explanation of this utility model, the working pressure of the nitrogen replacement tank is 0.1-0.8 MPa, the working pressure of the door-sealed nitrogen tank is 0.4-0.8 MPa, the nitrogen replacement tank and the door-sealed nitrogen tank are connected in parallel, and a first pneumatic valve is provided on the parallel pipeline;

[0013] If the pressure of the nitrogen purging tank is higher than that of the door-sealed nitrogen tank, nitrogen can flow from the nitrogen purging tank to the door-sealed nitrogen tank through the first pneumatic valve. If the pressure of the nitrogen purging tank is lower than that of the door-sealed nitrogen tank, the first pneumatic valve is closed to ensure the gas pressure inside the door-sealed nitrogen tank.

[0014] As a further explanation of this utility model, the nitrogen replacement storage tank is also connected to an EO cylinder, and a second pneumatic valve is connected to the pipeline between the EO cylinder and the dosing pipeline.

[0015] This utility model has the following advantages compared with the prior art:

[0016] This invention uses an independent door-sealed nitrogen storage tank for control, ensuring nitrogen supply, extending the service life of door seals and pneumatic components, and ensuring the full release of nitrogen in the nitrogen replacement tank. The nitrogen replacement tank and the door-sealed nitrogen storage tank work together for easy control and management, making it convenient and practical. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Explanation of reference numerals in the attached figures:

[0019] 1-Air compressor; 2-First air buffer tank; 3-Refrigerated dryer; 4-Impurity filter; 5-Second air buffer tank; 6-Activated carbon micro-oil mist filter; 7-Nitrogen generator; 8-Touch screen control panel; 9-Nitrogen buffer tank; 10-Nitrogen replacement storage tank; 11-Door-sealed nitrogen storage tank; 12-EO cylinder; 13-Second pneumatic ball valve; 14-First pneumatic ball valve; 15-Dosing pipeline; 16-Vaporizer; 17-Pneumatic control box; 18-Sterilizer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 As shown, this utility model provides a technical solution: a nitrogen generating device for an ethylene oxide sterilizer, including an air compressor 1, a first air buffer tank 2, a refrigerated dryer 3, a second air buffer tank 5, a nitrogen generator 7, a nitrogen buffer tank 9, a nitrogen replacement storage tank 10, a door-sealed nitrogen storage tank 11, and a sterilizer 18;

[0022] The air compressor 1, the first air buffer tank 2, the refrigerated dryer 3, and the second air buffer tank 5 are connected in sequence. The tail end of the second air buffer tank 5 is connected to the air inlet end of the nitrogen generator 7. The connecting pipes between the refrigerated dryer 3 and the first air buffer tank 2 and the second air buffer tank 5 are respectively connected to impurity filters 4. The second air buffer tank 5 and the nitrogen generator 7 are connected to activated carbon micro-oil mist filters 6.

[0023] When in use, the gas is prepared by the air compressor 1 and then enters the first air buffer tank 2 for cooling, oil removal and drainage. Then it enters the refrigerated dryer 3 to cool the gas to below the dew point and further remove water. During this process, it needs to pass through the impurity filter 4 for dust removal, water removal and oil removal. The treated compressed gas enters the second air buffer tank 5 for storage. After passing through the activated carbon micro oil mist filter 6 to absorb oil vapor and hydrocarbon vapor, it enters the nitrogen generator 7 to produce nitrogen.

[0024] The nitrogen generator 7 is used to prepare nitrogen gas. The nitrogen generator 7 is a PSA variable pressure nitrogen generator, and the purity of the prepared nitrogen gas is 99.9%-99.999%.

[0025] The nitrogen generator 7 is also connected to a touch screen control panel 8, which is used to display the operating parameters of the nitrogen generator in real time, and has a reserved communication interface and is equipped with a pressure transmitter. Flow, purity, pressure, dew point, maintenance and fault alarm data are transmitted to the user's DCS through the MODBUS communication protocol.

[0026] The nitrogen generator 7 is connected to the nitrogen buffer tank 9, which is connected to both the nitrogen replacement storage tank 10 and the door-sealed nitrogen storage tank 11. The nitrogen in the nitrogen replacement storage tank 10 enters the sterilizer 18 through the dosing pipeline 15 and the vaporizer 16, replacing the air in the sterilizer 18, primarily the oxygen content, and simultaneously reducing the partial pressure of EO gas, ensuring that the EO gas content is below the lower explosive limit. This process is achieved through… Figure 1 proceed along path a in the middle.

[0027] The nitrogen purging tank 10 is also connected to an EO cylinder 12. A second pneumatic valve 13 is connected to the pipeline between the EO cylinder 12 and the dosing pipeline 15. After the sterilization and purging stage is completed, the nitrogen is purged through... Figure 1The second pneumatic valve 13 on the a-line is closed, allowing any EO gas adhering to or remaining in the pipeline to enter the sterilizer 18 and be replaced and discharged.

[0028] The nitrogen in the nitrogen storage tank 11 of the door seal is connected to the gas control box 17 on the sterilizer 18. The gas supply to the door seal and the gas usage point is ensured by opening and closing the solenoid valve in the gas control box 17.

[0029] The working pressure of the nitrogen replacement tank 10 is 0.1-0.8 MPa, and the working pressure of the door-sealed nitrogen tank 11 is 0.4-0.8 MPa. The nitrogen replacement tank 10 and the door-sealed nitrogen tank 11 are connected in parallel, and a first pneumatic valve 14 is installed on the parallel pipeline.

[0030] If the pressure of nitrogen replacement tank 10 is higher than the pressure of door-sealed nitrogen tank 11, nitrogen can flow from nitrogen replacement tank 10 to door-sealed nitrogen tank 11 through the first pneumatic valve 14. If the pressure of nitrogen replacement tank 10 is lower than the pressure of door-sealed nitrogen tank 11, the first pneumatic valve 14 is closed to ensure the gas pressure inside door-sealed nitrogen tank 11.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nitrogen generator for an ethylene oxide sterilizer, characterized in that: It includes an air compressor (1), a first air buffer tank (2), a refrigerated dryer (3), a second air buffer tank (5), a nitrogen generator (7), a nitrogen buffer tank (9), a nitrogen replacement storage tank (10), a door-sealed nitrogen storage tank (11), and a sterilizer (18); The air compressor (1), the first air buffer tank (2), the refrigerated dryer (3), and the second air buffer tank (5) are connected in sequence, and the tail end of the second air buffer tank (5) is connected to the air inlet end of the nitrogen generator (7). The nitrogen generator (7) is used to prepare nitrogen. The nitrogen generator (7) is connected to the nitrogen buffer tank (9). The nitrogen buffer tank (9) is connected to the nitrogen replacement storage tank (10) and the door-sealed nitrogen storage tank (11). The nitrogen in the nitrogen replacement storage tank (10) enters the sterilizer (18) through the dosing pipeline (15) and the vaporizer (16). The nitrogen in the nitrogen storage tank (11) of the door seal is connected to the gas control box (17) on the sterilizer (18). The gas supply to the door seal and the gas usage point is ensured by opening and closing the solenoid valve in the gas control box (17).

2. The nitrogen generator for an ethylene oxide sterilizer according to claim 1, characterized in that, Impurity filters (4) are connected to the connecting pipes between the refrigerated dryer (3) and the first air buffer tank (2) and the second air buffer tank (5), respectively. An activated carbon micro-oil mist filter (6) is connected between the second air buffer tank (5) and the nitrogen generator (7).

3. The nitrogen generator for an ethylene oxide sterilizer according to claim 1, characterized in that, The nitrogen generator (7) is a PSA variable pressure nitrogen generator, which produces nitrogen with a purity of 99.9%-99.999%.

4. The nitrogen generator for an ethylene oxide sterilizer according to claim 1, characterized in that, The nitrogen generator (7) is also connected to a touch screen control panel (8).

5. A nitrogen generator for an ethylene oxide sterilizer according to claim 1, characterized in that, The working pressure of the nitrogen replacement tank (10) is 0.1-0.8 MPa, and the working pressure of the door-sealed nitrogen tank (11) is 0.4-0.8 MPa. The nitrogen replacement tank (10) and the door-sealed nitrogen tank (11) are connected in parallel, and a first pneumatic valve (14) is installed on the parallel pipeline. If the pressure of the nitrogen replacement tank (10) is higher than the pressure of the door-sealed nitrogen tank (11), nitrogen can flow from the nitrogen replacement tank (10) to the door-sealed nitrogen tank (11) through the first pneumatic valve (14). If the pressure of the nitrogen replacement tank (10) is lower than the pressure of the door-sealed nitrogen tank (11), the first pneumatic valve (14) is closed to ensure the gas pressure inside the door-sealed nitrogen tank (11).

6. A nitrogen generator for an ethylene oxide sterilizer according to claim 1, characterized in that, The nitrogen replacement storage tank (10) is also connected to an EO cylinder (12), and a second pneumatic valve (13) is connected to the pipeline between the EO cylinder (12) and the dosing pipeline (15).

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