VHP space sterilization anti-backflow pressure holding safety production system

Abstract

The utility model provides a kind of VHP space sterilization prevents backflow and pressure build-up safety production system, including the main conveying pipeline for connecting VHP sterilization equipment and sterilization space, first high-pressure fan is installed on main conveying pipeline, still include the by-pass conveying pipeline installed in the side of main conveying pipeline, second high-pressure fan is installed on by-pass conveying pipeline and is arranged in parallel with first high-pressure fan.The utility model is in parallel to the design of main conveying pipeline and by-pass conveying pipeline, combines pressure, temperature sensor and current relay, constructs a multiple protection safety production system, not only solves the backflow and pressure build-up problem caused by fan failure in VHP sterilization process, also through real-time monitoring and fast switching, significantly improve the security and reliability of system.

Description

Technical Field

[0001] This utility model relates to the field of air purification and sterilization technology, and in particular to a VHP space sterilization anti-backflow and pressure-locking safety production system. Background Technology

[0002] VHP sterilization technology is widely used in clean environment sterilization in pharmaceutical, biotechnology, and other fields, such as Class B / C cleanrooms, BIBO (Bioisolate-on-Board) systems, airlocks, isolators, and pass-through windows. During sterilization, VHP sterilization equipment uses a built-in high-pressure blower as a power source to deliver vaporized hydrogen peroxide gas to the sterilization space. Hydrogen peroxide solution (typically 35% concentration) is a hazardous chemical with strong oxidizing properties. It can react violently with iron or other impurities on metal surfaces, generating instantaneous high temperatures and potentially igniting open flames or fires. Furthermore, hydrogen peroxide gas leaks (regulations require concentrations exceeding 1 ppm) can harm the health of operators. Therefore, during sterilization, the high-pressure blower must operate continuously to maintain positive pressure in the delivery pipeline and prevent backflow of gas.

[0003] Existing VHP sterilization equipment typically employs a single high-pressure blower system, supplemented by monitoring methods such as pressure sensors, temperature sensors, and current relays to detect the blower's operating status. For example, pressure and temperature sensors are installed at the downstream end of the high-pressure blower to monitor blower performance and pipeline temperature anomalies; simultaneously, current relays are installed on the blower's electrical circuitry to monitor the blower current in real time; if the current is zero, it indicates that the blower has stopped operating. These measures can trigger alarms promptly, alerting operators to handle faults. However, existing systems suffer from response lag: by the time sensors detect abnormal pressure or a sudden temperature rise, a fault may have already occurred, with backflow or pressure buildup leading to hydrogen peroxide leakage or high-temperature risks. Furthermore, single-blower systems lack backup mechanisms in case of failure, making it impossible to immediately restore positive pressure in the pipeline, and safety hazards cannot be completely eliminated.

[0004] Based on this, this utility model proposes a VHP space sterilization anti-backflow and pressure-locking safety production system. By adding a bypass delivery pipeline and a backup high-pressure fan, combined with multiple sensors and intelligent control, it can achieve rapid fault switching and positive pressure maintenance, fundamentally eliminating the risks of backflow and pressure lock-up. Utility Model Content

[0005] The technical problem this invention aims to solve is: addressing the shortcomings of existing technologies by providing a VHP space sterilization anti-backflow and pressure-locking safety production system, which can effectively prevent hydrogen peroxide gas backflow and pipeline pressure lock-up, ensuring the safety and reliability of the sterilization process.

[0006] To solve the above-mentioned technical problems, this utility model adopts the following technical solution:

[0007] A VHP space sterilization anti-backflow and pressure-locking safety production system includes a main delivery pipeline for connecting VHP sterilization equipment and sterilization space, a first high-pressure fan installed on the main delivery pipeline, and a bypass delivery pipeline installed on one side of the main delivery pipeline, wherein a second high-pressure fan is installed on the bypass delivery pipeline in parallel with the first high-pressure fan.

[0008] Preferably, the main delivery pipeline includes a first delivery pipe and a first high-pressure blower and a first pipeline solenoid valve installed on the first delivery pipe, and the first pipeline solenoid valve is located downstream of the first high-pressure blower.

[0009] More preferably, the main delivery pipeline further includes a pressure sensor installed on the first delivery pipeline, the pressure sensor being located downstream of the first pipeline solenoid valve.

[0010] More preferably, the main delivery pipeline further includes a temperature sensor installed on the first delivery pipeline, the temperature sensor being located downstream of the pressure sensor.

[0011] Preferably, the temperature sensor is an RTD temperature probe, and the pressure sensor is a PS-05 ultra-miniature semiconductor pressure sensor.

[0012] Preferably, the first conveying pipeline is made of SUS304 stainless steel rigid pipe, and the first high-pressure blower is a FAN-01 variable frequency high-pressure blower.

[0013] Preferably, a current relay is installed on the electrical circuit of the first high-pressure blower to monitor the current value of the high-pressure blower in real time. If the value is 0, it means that the blower is not running.

[0014] More preferably, the bypass delivery pipeline includes a second delivery pipeline and a second high-pressure blower installed on the second delivery pipeline;

[0015] The front end of the second conveying pipe is connected to the first conveying pipe upstream of the first high-pressure blower, and the rear end is connected to the first conveying pipe downstream of the first pipe solenoid valve.

[0016] More preferably, the bypass delivery pipeline further includes a second pipeline solenoid valve installed on the first pipeline solenoid valve, and the second pipeline solenoid valve is located upstream of the second high-pressure blower.

[0017] More preferably, the bypass delivery pipeline further includes a third pipeline solenoid valve installed on the first pipeline solenoid valve, and the third pipeline solenoid valve is located downstream of the second high-pressure blower.

[0018] Preferably, the second conveying pipeline is made of SUS304 stainless steel rigid pipe, and the second high-pressure blower is a FAN-01 variable frequency high-pressure blower.

[0019] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0020] (1) Completely eliminate backflow and pressure buildup: Through the parallel design of the main delivery pipeline and the bypass delivery pipeline, when the main fan fails, the system can immediately switch to the bypass fan to maintain positive pressure in the pipeline and prevent hydrogen peroxide gas backflow; this avoids safety risks such as hydrogen peroxide leakage, high temperature flash explosion, open flame or fire caused by gas backflow.

[0021] (2) Real-time monitoring and rapid response: The system integrates pressure sensors, temperature sensors and current relays to monitor the fan operation status, pipeline pressure and temperature in real time; once an abnormality is detected (such as pressure deviating from the set value, temperature rising suddenly or fan current is zero), the system immediately triggers an alarm and automatically starts the bypass fan, reducing response lag time, ensuring timely handling of faults, and protecting equipment safety and personnel health.

[0022] (3) Multiple protections and improved reliability: Both the main fan and the bypass fan are variable frequency high-pressure fans, which are controlled by solenoid valves to achieve system redundancy design; even if the main fan fails completely, the bypass fan can take over seamlessly to ensure the continuity of the sterilization process; at the same time, the use of stainless steel hard pipes and high-precision sensors enhances the durability and monitoring accuracy of the system.

[0023] (4) Easy to operate and convenient to maintain: The system reduces manual intervention through automated control, and operators can quickly locate the fault point through alarm information; the bypass pipeline is independently designed, which facilitates maintenance and replacement of parts and reduces operation and maintenance costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the frame structure of a VHP space sterilization anti-backflow and pressure-locking safety production system according to this utility model;

[0025] The accompanying figures are labeled as follows:

[0026] 100 - Main delivery pipeline, 101 - First delivery pipeline, 102 - First high-pressure blower, 103 - First pipeline solenoid valve, 104 - Pressure sensor, 105 - Temperature sensor; 200 - Bypass delivery pipeline, 201 - Second delivery pipeline, 202 - Second high-pressure blower, 203 - Second pipeline solenoid valve, 204 - Third pipeline solenoid valve. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] like Figure 1 As shown, this embodiment provides a VHP space sterilization anti-backflow and pressure-locking safety production system, which mainly includes a main delivery pipeline 100 and a bypass delivery pipeline 200. The main delivery pipeline 100 is used to connect the VHP sterilization equipment and the sterilization space, and is responsible for the gas delivery during the normal sterilization process; the bypass delivery pipeline 200 is connected in parallel with the main delivery pipeline 100 as a backup system, which is activated when the main delivery pipeline fails.

[0030] A first high-pressure blower 102 is installed on the main delivery pipeline 100, and a second high-pressure blower 202 is installed on the bypass delivery pipeline 200. The second high-pressure blower 202 is arranged in parallel with the first high-pressure blower 102. Through the parallel design of the main delivery pipeline 100 and the bypass delivery pipeline 200, when the first high-pressure blower 102 fails, the system can immediately switch to the bypass second high-pressure blower 202 to maintain positive pressure in the pipeline and prevent hydrogen peroxide gas backflow. This avoids safety risks such as hydrogen peroxide leakage, high-temperature flash explosion, open flame, or fire caused by gas backflow.

[0031] like Figure 1 As shown, the main delivery pipeline 100 includes a first delivery pipeline 101, a first high-pressure blower 102, a first pipeline solenoid valve 103, a pressure sensor 104, and a temperature sensor 105.

[0032] The first conveying pipeline 101 is made of SUS304 stainless steel hard pipe, which has the characteristics of corrosion resistance and high strength, and is suitable for hydrogen peroxide gas conveying.

[0033] The first high-pressure blower 102 is a FAN-01 variable frequency high-pressure blower, installed on the first conveying pipeline 101, serving as the main power source to provide the positive pressure required for gas conveying. The blower adopts a variable frequency design, which can adjust the air volume according to sterilization requirements.

[0034] The first pipeline solenoid valve 103 is installed downstream of the first high-pressure blower 102 and is used to control the opening and closing of the main delivery pipeline. During normal operation, the solenoid valve is in the open state; when a fault is detected, it can automatically close to isolate the main pipeline.

[0035] Pressure sensor 104 is a PS-05 ultra-miniature semiconductor pressure sensor, installed downstream of the first pipeline solenoid valve 103, for real-time monitoring of pipeline pressure. The pressure data detected by pressure sensor 104 is transmitted to the control system; if the pressure value is lower or higher than the set range, an alarm is triggered.

[0036] Temperature sensor 105 employs an RTD temperature probe, i.e., a resistance temperature detector, installed downstream of pressure sensor 104 for real-time monitoring of pipeline temperature. The RTD probe features high accuracy and fast response characteristics, immediately sending a signal to the control system when a sudden temperature rise is detected (possibly due to backflow or pressure buildup causing an exothermic reaction).

[0037] During normal sterilization, the first high-pressure blower 102 operates continuously to maintain positive pressure within the first delivery pipeline 101. Pressure sensor 104 and temperature sensor 105 monitor the pipeline status in real time. If the pressure is abnormal (a pressure drop indicates a decrease in blower performance or backflow, while a pressure rise indicates pressure buildup) or the temperature rises abnormally, the control system will trigger an audible and visual alarm and automatically execute a switching procedure.

[0038] like Figure 1 As shown, the bypass delivery pipeline 200 mainly includes a second delivery pipeline 201, a second high-pressure blower 202, a second pipeline solenoid valve 203, and a third pipeline solenoid valve 204.

[0039] The second conveying pipe 201 also uses SUS304 stainless steel rigid pipe. Its front end is connected to the first conveying pipe 101 upstream of the first high-pressure blower 102, and its tail end is connected to the first conveying pipe 101 downstream of the first pipe solenoid valve 103, forming a parallel circuit.

[0040] The second high-pressure blower 202 is a FAN-01 variable frequency high-pressure blower, arranged in parallel with the first high-pressure blower 102 as a backup power source. Its specifications are consistent with the main blower to ensure stable air pressure and air volume after switching.

[0041] The second pipeline solenoid valve 203 is installed upstream of the second high-pressure blower 202 and is used to control the air intake of the bypass pipeline.

[0042] The third pipeline solenoid valve 204 is installed downstream of the second high-pressure blower 202 and is used to control the air supply of the bypass pipeline.

[0043] During normal operation, the second pipeline solenoid valve 203 and the third pipeline solenoid valve 204 are in the closed state, and the bypass pipeline is on standby. When the main delivery pipeline 100 fails, these two solenoid valves 203 and 204 automatically open, allowing the bypass pipeline to connect to the system.

[0044] Combination Figure 1As shown, the working principle of this VHP space sterilization anti-backflow and pressure-locking safety production system is based on a multi-monitoring and automatic switching mechanism, as detailed below:

[0045] (I) Normal sterilization process: The first high-pressure blower 102 operates, the first pipeline solenoid valve 103 opens, and gas is delivered to the sterilization space through the main delivery pipeline 100. The pressure sensor 104 and temperature sensor 105 continuously monitor the pipeline status, and the current relay monitors the current of the first high-pressure blower 102 in real time. If the current is zero, it indicates that the blower has stopped operating, and the control system immediately triggers the bypass system.

[0046] (II) Fault Detection and Response:

[0047] Pressure Abnormality: If pressure sensor 104 detects a pressure deviation from the set range, for example, low pressure indicates a decrease in the performance of the first high-pressure blower 102 or gas backflow, while high pressure indicates pipeline pressure buildup, the control system first triggers an alarm, then closes the first pipeline solenoid valve 103, simultaneously opens the second pipeline solenoid valve 203 and the third pipeline solenoid valve 204, and starts the second high-pressure blower 202. The bypass delivery pipeline 200 is then put into operation to maintain positive pipeline pressure.

[0048] Temperature anomaly: If the reaction between hydrogen peroxide and metal is exothermic due to backflow, the temperature sensor 105 will detect a sudden temperature rise. The system will also trigger an alarm and close the first pipeline solenoid valve 103, while opening the second pipeline solenoid valve 203 and the third pipeline solenoid valve 204, and starting the second high-pressure blower 202 to switch to the bypass delivery pipeline 200.

[0049] Current monitoring: The current relay directly monitors the current of the first high-pressure blower 102. If the current is zero, it indicates that the first high-pressure blower 102 has unexpectedly stopped. The system immediately switches to the bypass delivery pipeline 200 without waiting for the pressure or temperature sensor response, thereby reducing the lag time.

[0050] Bypass pipeline operation: After the second high-pressure blower 202 starts, gas is transported through the second delivery pipeline 201, bypassing the faulty first high-pressure blower 102 section, ensuring that the positive pressure in the sterilization space is maintained. At the same time, the system continues to monitor the pipeline status through pressure sensor 104 and temperature sensor 105 to ensure the normal operation of the bypass pipeline.

[0051] In practical applications, this VHP space sterilization anti-backflow and pressure-locking safety production system can also be integrated with a PLC controller to achieve automated control. When the pressure sensor 104 detects that the pressure is lower than the threshold (e.g., 0.5 bar), the PLC issues a switching command within 1 second; when the current relay detects that the current of the first high-pressure blower 102 is zero, it automatically switches to the second high-pressure blower 202, and the switching time can be shortened to within 0.5 seconds.

[0052] This invention utilizes a parallel design of the main delivery pipeline 100 and the bypass delivery pipeline 200, combined with pressure and temperature sensors and current relays, to construct a multi-protected safe production system. It not only solves the problems of backflow and pressure buildup caused by fan failure during VHP sterilization, but also significantly improves the system's safety and reliability through real-time monitoring and rapid switching.

[0053] Furthermore, the preferred selection of components such as SUS304 stainless steel and models such as FAN-01 fan and PS-05 pressure sensor in the above specific embodiments further optimizes the system performance, making it suitable for sterilization scenarios in various pharmaceutical and biotechnology fields.

[0054] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0055] Secondly, the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0056] Finally, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A VHP space sterilization anti-backflow and pressure-locking safety production system, comprising a main delivery pipeline (100) for connecting VHP sterilization equipment and sterilization space, wherein a first high-pressure blower (102) is installed on the main delivery pipeline (100), characterized in that, It also includes a bypass delivery pipeline (200) installed on one side of the main delivery pipeline (100), on which a second high-pressure blower (202) is installed in parallel with the first high-pressure blower (102).

2. The VHP space sterilization anti-backflow and pressure-locking safety production system according to claim 1, characterized in that, The main delivery pipeline (100) includes a first delivery pipeline (101) and a first high-pressure blower (102) and a first pipeline solenoid valve (103) installed on the first delivery pipeline (101), and the first pipeline solenoid valve (103) is located downstream of the first high-pressure blower (102).

3. The VHP space sterilization anti-backflow and pressure-locking safety production system according to claim 2, characterized in that, The main delivery pipeline (100) also includes a pressure sensor (104) installed on the first delivery pipeline (101), the pressure sensor (104) being located downstream of the first pipeline solenoid valve (103).

4. The VHP space sterilization anti-backflow and pressure-locking safety production system according to claim 3, characterized in that, The main delivery pipeline (100) also includes a temperature sensor (105) installed on the first delivery pipeline (101), the temperature sensor (105) being located downstream of the pressure sensor (104).

5. The VHP space sterilization anti-backflow and pressure-locking safety production system according to claim 4, characterized in that, A current relay is installed on the electrical circuit of the first high-pressure blower (102) to monitor the current value of the high-pressure blower in real time.

6. The VHP space sterilization anti-backflow and pressure-locking safety production system according to claim 2, characterized in that, The first conveying pipeline (101) is made of SUS304 stainless steel hard pipe, and the first high-pressure blower (102) is a FAN-01 variable frequency high-pressure blower.

7. The VHP space sterilization anti-backflow and pressure-locking safety production system according to claim 2, characterized in that, The bypass delivery pipeline (200) includes a second delivery pipeline (201) and a second high-pressure blower (202) installed on the second delivery pipeline (201); The front end of the second conveying pipe (201) is connected to the first conveying pipe (101) upstream of the first high-pressure blower (102), and the rear end is connected to the first conveying pipe (101) downstream of the first pipe solenoid valve (103).

8. The VHP space sterilization anti-backflow and pressure-locking safety production system according to claim 7, characterized in that, The bypass delivery pipeline (200) also includes a second pipeline solenoid valve (203) installed on the first pipeline solenoid valve (103), and the second pipeline solenoid valve (203) is located upstream of the second high-pressure blower (202).

9. The VHP space sterilization anti-backflow and pressure-locking safety production system according to claim 8, characterized in that, The bypass delivery pipeline (200) also includes a third pipeline solenoid valve (204) installed on the first pipeline solenoid valve (103), and the third pipeline solenoid valve (204) is located downstream of the second high-pressure blower (202).

10. The VHP space sterilization anti-backflow and pressure-locking safety production system according to claim 8, characterized in that, The second conveying pipeline (201) is made of SUS304 stainless steel hard pipe, and the second high-pressure blower (202) is a FAN-01 variable frequency high-pressure blower.

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