Self-checking alarm radioactive contamination protection airflow distribution device and self-checking method

Abstract

This invention relates to a radioactive contamination protection airflow distribution device and self-testing method with a self-testing alarm. An air inlet is used to introduce incoming airflow; a filter is connected to the air inlet to filter the incoming airflow; a self-testing alarm is installed downstream of the filter to detect the airflow pressure and activate the alarm when the airflow pressure exceeds a threshold range; the self-testing alarm includes a pressure switch, an electrical contact pressure gauge, a normally open relay, and an alarm. The parallel connection of the relay contacts and the pressure switch, along with the relay coil, forms a self-testing circuit, while the relay contacts, the electrical contact pressure gauge, and the alarm form an alarm circuit; a diverter is installed downstream of the self-testing alarm to divide the incoming airflow into multiple outgoing airflows; and an air outlet is used to output multiple outgoing airflows. This device achieves the goal of setting up an alarm and multiple contact switches in series and parallel to form a self-testing mechanism, thereby improving the safety of workers.

Description

Technical Field

[0001] This invention relates to the field of radioactive contamination protection technology, and in particular to a radioactive contamination protection airflow distribution device and self-testing method with self-testing alarm. Background Technology

[0002] Radioactive contamination is unavoidable in activities such as nuclear fuel production, nuclear facility decommissioning, spent fuel reprocessing, and nuclear power plant operation. Workers entering these areas must take appropriate protective measures to prevent radioactive materials from entering the body and causing internal radiation hazards. Compressed air-supplied full-body radioactive contamination protective suits and radioactive contamination protective hoods are commonly used protective equipment. By continuously supplying compressed air to the inside of the suit / hood, they can provide effective respiratory protection and even full-body protection for workers.

[0003] Existing airflow distribution products in the field of radioactive contamination only have basic diversion functions. However, due to their limited functionality or strong application focus, they can only supply airflow. If abnormal airflow supply occurs when personnel enter the relevant area, it will lead to dangerous operations. However, existing airflow distribution devices in the field of radioactive contamination cannot provide warnings of abnormal airflow.

[0004] In addition, some airflow distribution products in other fields have alarms, but there may be situations where the alarm malfunctions and cannot be detected. These products can be used in non-hazardous areas, but in areas with radioactive contamination, abnormal airflow supply when the alarm malfunctions can put workers in dangerous working conditions, posing a significant safety hazard.

[0005] The above problems urgently need to be addressed. Summary of the Invention

[0006] This invention discloses a radioactive contamination protection airflow distribution device and self-testing method with self-testing alarm, aiming to solve the technical problems existing in the prior art.

[0007] The present invention adopts the following technical solution: On one hand, the present invention provides a radioactive contamination protection airflow distribution device with self-testing alarm, comprising: an air inlet for introducing airflow; a filter connected to the air inlet for filtering the airflow; a self-testing alarm installed downstream of the filter for detecting the airflow pressure of the airflow and for activating an alarm when the airflow pressure exceeds a threshold range; the self-testing alarm includes a pressure switch, an electrical contact pressure gauge, a normally open relay, and an alarm; the normally open relay includes a relay contact and a relay coil; the relay contact is connected in parallel with the pressure switch, and the relay coil is connected in series with the relay contact; the parallel structure of the relay contact and the pressure switch, and the relay coil form a self-testing circuit; the electrical contact pressure gauge is connected in series with the relay contact; the alarm is connected in series with the electrical contact pressure gauge; the relay contact, the electrical contact pressure gauge, and the alarm form an alarm circuit; a splitter installed downstream of the self-testing alarm for dividing the airflow into multiple outlet airflows; and an air outlet connected to the splitter for outputting multiple outlet airflows.

[0008] Optionally, the self-test alarm further includes a stop button, connected in series with the relay coil and the pressure switch, for disconnecting the current path of the relay coil and stopping the alarm from working.

[0009] Optionally, the self-test alarm further includes a battery connected in series with the stop button to power the self-test alarm.

[0010] Optionally, the filter includes: a primary filter installed on one side of the air inlet for filtering solid particles; and a secondary filter installed downstream of the primary filter for filtering liquid particles.

[0011] Optionally, it also includes: a pressure regulating valve, disposed between the filter and the distributor, and disposed in parallel with the self-test alarm, for adjusting the air pressure of the intake airflow entering the distributor.

[0012] Optionally, it also includes: a housing, disposed outside the filter, the self-test alarm and the diverter, the air inlet passing through the side wall of the housing and connecting the filter on the outside and inside of the housing, and the air outlet passing through the side wall of the housing and connecting the diverter on the outside and inside of the housing.

[0013] Optionally, the housing includes swivel casters, which are mounted on the bottom surface of the housing and located at the four corners of the bottom surface.

[0014] Optionally, the enclosure further includes a multi-functional handle, disposed on the top surface of the enclosure and located at the edge of the top surface.

[0015] According to another aspect of the present invention, a self-test alarm method for a radioactive contamination protection airflow distribution device is also provided, comprising: setting a first pressure threshold range for an electrical contact pressure gauge and setting a second pressure threshold for a pressure switch, wherein the second pressure threshold is lower than the first pressure threshold range; connecting an intake airflow to the airflow distribution device based on the intake interface, the self-test alarm entering a working state; when the initial intake airflow is higher than the second pressure threshold and lower than the first pressure threshold range, all pressure switches close, the self-test circuit containing the pressure switches forms a circuit, the relay coil is turned on, controlling the relay contacts to close and self-lock, the electrical contact pressure gauge closes, and the alarm is activated. When the alarm circuit is established, the self-test alarm enters a self-test alarm state. The self-test alarm's operating states include both a self-test alarm state and a protection alarm state. After the intake airflow stabilizes, the self-test alarm adjusts the opening and closing state of the contacts within the electrical contact pressure gauge based on the intake airflow pressure, thus entering a protection alarm state. After the airflow distribution device is used, the intake airflow is disconnected, the airflow pressure becomes 0, the pressure switch opens, the stop button is pressed, the relay coil is de-energized, the relay contacts open, the self-locking state of the normally open relay is released, the alarm circuit containing the alarm is disconnected, and the self-test alarm de-energizes.

[0016] Optionally, after the intake airflow stabilizes, the self-test alarm adjusts the opening and closing state of the contacts in the electrical contact pressure gauge and the opening and closing state of the pressure switch based on the airflow pressure of the intake airflow. The self-test alarm then forms a protective alarm state, including: when the airflow pressure of the intake airflow is within the first pressure threshold range, the contacts in the electrical contact pressure gauge switch from a closed state to an open state, and the alarm in the self-test alarm does not operate; when the airflow pressure of the intake airflow is higher than or lower than the first pressure threshold range, the contacts in the electrical contact pressure gauge switch from an open state to a closed state, and the alarm in the self-test alarm operates.

[0017] The technical solution adopted in this invention can achieve at least one of the following beneficial effects: In this embodiment of the invention, a self-testing alarm is set up to promptly acquire the airflow pressure of the intake airflow. The alarm is activated when the airflow pressure exceeds a threshold range, thus ensuring the safety of the workers. Furthermore, a normally open relay is linked to a pressure switch, and an electrical contact pressure gauge is connected in series with both. During the initial intake airflow, as the air source pressure reaches the required pressure within the first pressure threshold range, an alarm is triggered briefly when the pressure falls between the second pressure threshold and the lowest point of the first pressure threshold range. This indicates that the alarm is functioning correctly, thus creating a self-testing effect. This verifies the alarm's normal function and improves the safety of its use, thereby enhancing the safety of the workers. The invention achieves the goal of setting up an alarm and multiple contact switches in series and parallel to form a self-test, thereby improving the technical effect of improving the safety of workers during operations. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the airflow structure of a radioactive contamination protection airflow distribution device with self-testing alarm in Embodiment 1 of the present invention; Figure 2 This is a connection diagram of the self-testing alarm of a radioactive contamination protection airflow distribution device according to Embodiment 1 of the present invention; Figure 3 This is a flow direction diagram of the airflow in a radioactive contamination protection airflow distribution device with self-checking alarm in Embodiment 1 of the present invention; Figure 4 This is a left rear view of the housing in a radioactive contamination protection airflow distribution device with self-checking alarm according to Embodiment 1 of the present invention; Figure 5 This is a front right view of the housing in a radioactive contamination protection airflow distribution device with self-checking alarm according to Embodiment 1 of the present invention; Figure 6 This is a diagram of the internal structure of the housing in a radioactive contamination protection airflow distribution device with self-checking alarm according to Embodiment 1 of the present invention; Figure 7 This is a flowchart of a self-test alarm method for a radioactive contamination protection airflow distribution device in Embodiment 2 of the present invention.

[0019] Explanation of reference numerals in the attached figures: 01. Housing; 02. Electrical contact pressure gauge; 03. Alarm; 04. Stop button; 05. Air inlet; 06. Air outlet; 07. Charging port; 08. Primary filter; 09. Secondary filter; 10. Pressure regulating valve; 11. Pressure switch; 12. Diverter; 13. Battery; 14. Universal casters; 15. Multifunctional handle; 16. Device door; 17. Relay contacts; 18. Relay coil. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0021] 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 a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0022] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] First, to facilitate understanding of the embodiments of the present invention, some terms or nouns involved in the present invention will be explained below: A pressure switch is a mechanical pressure detection switch that has a built-in pressure sensing element and contact switch. It detects the pressure of fluids (gas, liquid) and directly switches the circuit on or off when a preset value is reached.

[0024] An electric contact pressure gauge is a type of pressure gauge with contacts. It consists of a pointer-type pressure gauge and an electric contact device. It displays the pressure value in real time and triggers the circuit to open or close when the pressure reaches the upper or lower limit contacts.

[0025] A normally open relay is an electromagnetic control switch that has no independent detection function. It uses a small current to control a large current, amplifies the contact capacity, and isolates the control side from the controlled side circuit.

[0026] To address the problems existing in related technologies, this application provides a radioactive contamination protection airflow distribution device and self-testing method with self-testing alarm.

[0027] Example 1 This embodiment provides a self-checking alarm-equipped radioactive contamination protection airflow distribution device, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of the airflow structure of a self-checking alarm radioactive contamination protection airflow distribution device according to Embodiment 1 of the present invention. The device includes: Air intake port 05 is used to introduce intake airflow; a filter, connected to air intake port 05, is used to filter the intake airflow; a self-test alarm, installed downstream of the filter, detects the airflow pressure and activates the alarm when the airflow pressure exceeds a threshold range; the self-test alarm includes a pressure switch 11, an electrical contact pressure gauge 02, a normally open relay, and an alarm 03. The normally open relay includes a relay contact 17 and a relay coil 18. The relay contact 17 is connected in parallel with the pressure switch 11, and the relay coil 18... 8 is connected in series with relay contact 17. The parallel structure of relay contact 17 and pressure switch 11, along with relay coil 18, forms a self-test circuit. Electrical contact pressure gauge 02 is connected in series with relay contact 17. Alarm 03 is connected in series with electrical contact pressure gauge 02. Relay contact 17, electrical contact pressure gauge 02, and alarm 03 form an alarm circuit. Diverter 12 is installed downstream of the self-test alarm and is used to divide the intake airflow into multiple exhaust airflows. Exhaust port 06 is connected to diverter 12 and is used to output multiple exhaust airflows.

[0028] Optionally, the device includes an electrical contact pressure gauge 02, an alarm 03, an air inlet 05, and an air outlet 06. It has one air inlet 05 and six air outlets 06. The air inlet 05 is a quick-connect male connector, and the air outlets 06 are self-locking quick-connect female connectors. In application, the air inlet 05 is connected to an air source, and the air outlets 06 are connected to one or more sets of protective clothing or hoods as needed. The air outlets 06 are closed when not connected to a corresponding male connector and automatically open to supply air after being connected to a corresponding male connector. All components are connected via sanitary chucks or sealing threads. The maximum flow rate of each component is greater than the total flow rate required when six sets of protective clothing or hoods are used simultaneously.

[0029] Optionally, an electrical contact pressure gauge 02 is connected between the air inlet 05 and the air outlet 06 to set and display the alarm pressure of the airflow within the entire device. An alarm 03 is connected to the electrical contact pressure gauge 02 to provide an alarm when the airflow pressure exceeds a threshold range. The alarm 03 can be an audible and visual alarm 03, capable of providing both sound and light alarms simultaneously. A pressure switch 11 is connected to the electrical contact pressure gauge 02 and can automatically open or close under a set pressure.

[0030] like Figure 2 As shown, Figure 2 This is a connection diagram of a self-testing alarm for a radioactive contamination protection airflow distribution device according to Embodiment 1 of the present invention. The alarm function relies on the setting of the threshold pressure of the electrical contact pressure gauge 02 and the pressure switch 11. The electrical contact pressure gauge 02 can be set with two pressures, P1 and P2 (P1 < P2), that is, a first pressure threshold range is set. When the airflow pressure is between P1 and P2, the contact of the electrical contact pressure gauge 02 is in the open state. When the pressure is lower than P1 or higher than P2, the contact of the electrical contact pressure gauge 02 is in the closed state. The pressure switch 11 can be set with a pressure threshold P0 (P0 < P1). When the airflow pressure is lower than P0, the contact of the pressure switch 11 is in the open state. When the airflow pressure is higher than P0, the contact of the pressure switch 11 is in the closed state. During the process of reaching the required pressure between P1 and P2 after connecting to the air source (intake airflow), when the pressure is between P0 and P1, the pressure switch 11 closes, the relay coil 18 in the self-test circuit is energized, thereby triggering the relay contact 17 to close and self-lock. The alarm circuit will trigger the alarm for a short time, indicating that the alarm 03 can work normally. The alarm range is determined by the pressures P1 and P2 set by the electric contact pressure gauge 02. After the device enters the normal use state, as long as the pressure is not within this range, a continuous alarm can be triggered.

[0031] In some preferred embodiments, the self-test alarm further includes a stop button 04, connected in series with the relay coil 18 and the pressure switch 11, for disconnecting the current path of the relay coil and stopping the alarm from working.

[0032] Optionally, the stop button 04 is connected in series in the self-test circuit. When the radioactive contamination protection airflow distribution device is used up, the normally open relay is in the closed state, which will cause the alarm 03 to work continuously. At this time, the current of the entire self-test circuit needs to be disconnected by the stop button 04 to de-energize the relay coil 18, thereby controlling the relay contact 17 to turn off the alarm prompt.

[0033] In some preferred embodiments, the self-test alarm further includes a battery 13, connected in series with the stop button 04, for powering the self-test alarm.

[0034] Optionally, a battery 13 is installed inside the device to provide the necessary power to the alarm 03 and the entire series circuit. A charging structure is connected to the battery 13, and a charging port 07 is provided to charge the battery 13, so as to enable the device to be used repeatedly.

[0035] In some preferred embodiments, the filter includes: a primary filter 08, installed on one side of the air inlet 05, for filtering solid particles; and a secondary filter 09, installed downstream of the primary filter 08, for filtering liquid particles.

[0036] Optionally, the primary filter 08 and the secondary filter 09 can further purify the gas supplied by the intake airflow, so that the size of solid particles in the breathing air is ≤0.01μm and the content of liquid particles is ≤0.01mg / m3.

[0037] Optionally, when the intake airflow has undergone sufficient filtration or the airflow distribution device is arranged in a clean environment, the two-stage filter in the distribution device can be omitted to reduce the size and weight of the distribution device and improve portability.

[0038] In some preferred embodiments, it also includes: a pressure regulating valve 10, which is disposed between the filter and the distributor 12 and is disposed in parallel with the self-test alarm, for regulating the air pressure of the intake airflow entering the distributor 12.

[0039] Optional, such as Figure 3 As shown, Figure 3 This is a flow diagram of the airflow in a radioactive contamination protection airflow distribution device with self-testing alarm in Embodiment 1 of the present invention. The main body of the air path includes, from air inlet 05, primary filter 08, secondary filter 09, pressure regulating valve 10, distributor 12 and air outlet 06 in sequence from air inlet to air outlet. A three-way connector is installed at the pressure detection port of pressure regulating valve 10, which is connected to electrical contact pressure gauge 02 and pressure switch 11. Pressure regulating valve 10 can adjust the output pressure to meet the air supply pressure requirements of different protective suits or hoods.

[0040] In some preferred embodiments, such as Figure 4 , 5 As shown in Figure 6, Figure 4 This is a left rear view of the housing 01 in a radioactive contamination protection airflow distribution device with self-checking alarm according to Embodiment 1 of the present invention. Figure 5 This is a right front view of the housing 01 in a radioactive contamination protection airflow distribution device with self-testing alarm according to Embodiment 1 of the present invention. Figure 6This is an internal structural diagram of the housing 01 in a radioactive contamination protection airflow distribution device with self-testing alarm according to Embodiment 1 of the present invention. It also includes: housing 01, which is disposed outside the filter, self-testing alarm and diverter 12; air inlet 05 passes through the side wall of housing 01 and connects the filter on the outside and inside of housing 01; air outlet 06 passes through the side wall of housing 01 and connects the diverter 12 on the outside and inside of housing 01.

[0041] In some preferred embodiments, the housing 01 includes: swivel casters 14, which are mounted on the bottom surface of the housing 01 and located at the four corners of the bottom surface.

[0042] In some preferred embodiments, the housing 01 further includes a multi-functional handle 15, which is disposed on the top surface of the housing 01 and located at the edge of the top surface.

[0043] Optionally, the bottom of the housing 01 is equipped with four omnidirectional casters 14 for moving the entire device on flat ground; the top of the housing 01 is designed with two multi-functional handles 15, which can be used for pushing, pulling, carrying and hoisting the entire device when moving; the side of the housing 01 is provided with a device door 16, which can be used to open the housing 01 to inspect the internal device.

[0044] Example 2 Based on the above embodiments, the present invention also proposes an implementation method for a self-test alarm method. Figure 7 This is a flowchart of a self-test alarm method for a radioactive contamination protection airflow distribution device according to Embodiment 2 of the present invention, as shown below. Figure 7 As shown, the method includes: Step S1: Set a first pressure threshold range for the electrical contact pressure gauge 02 and a second pressure threshold for the pressure switch 11, wherein the second pressure threshold is lower than the first pressure threshold range; Optionally, the alarm function relies on the setting of the threshold pressure of the electrical contact pressure gauge 02 and the pressure switch 11. The electrical contact pressure gauge 02 can be set with two pressures, P1 and P2 (P1 < P2), which is the first pressure threshold range. When the airflow pressure is between P1 and P2, the contact is in the open state. When the airflow pressure is lower than P1 or higher than P2, the contact is in the closed state. The pressure switch 11 can be set with one pressure, P0 (P0 < P1), which is the second pressure threshold. When the airflow pressure is lower than P0, the contact is in the open state. When the airflow pressure is higher than P0, the contact is in the closed state.

[0045] Step S2: Connect the airflow to the airflow distribution device based on the air intake interface 05. The self-test alarm enters the working state. When the initial airflow is higher than the second pressure threshold and lower than the first pressure threshold range, the pressure switch 11 closes, the self-test circuit where the pressure switch 11 is located forms a circuit, the relay coil 18 is turned on, the control relay contact 17 closes and self-locks, the electrical contact pressure gauge 02 closes, the alarm circuit where the alarm 03 is located forms a circuit, and the self-test alarm forms a self-test alarm state. The working state of the self-test alarm includes the self-test alarm state and the protection alarm state. Optionally, when the air intake port 05 is not connected to the air intake flow or the pressure is lower than P0 after the initial connection to the air intake flow, the pressure switch 11 contact and the relay contact 17 are both disconnected, and the alarm 03 does not work.

[0046] Step S3: After the intake airflow stabilizes, the self-test alarm adjusts the opening and closing state of the contacts inside the electrical contact pressure gauge 02 based on the airflow pressure of the intake airflow, and the self-test alarm forms a protection alarm state. Optionally, after the initial connection to the gas source, when the airflow pressure rises above P0, the pressure switch 11 contacts close, the relay coil 18 is energized, and the control relay contact 17 closes and self-locks. After this, if the airflow pressure is between P1 and P2, the contacts of the electrical contact pressure gauge 02 open, and the alarm 03 does not work; if the airflow pressure is lower than P1 (including lower than P0) or higher than P2, both the relay contact 17 and the contacts of the electrical contact pressure gauge 02 are closed, and the alarm 03 will continue to sound.

[0047] In some preferred embodiments, after the intake airflow stabilizes, the self-test alarm adjusts the opening and closing state of the contacts in the electrical contact pressure gauge 02 based on the intake airflow pressure, and the self-test alarm forms a protective alarm state, including: when the intake airflow pressure rises to within a first pressure threshold range, the contacts in the electrical contact pressure gauge 02 switch from a closed state to an open state, and the alarm 03 in the self-test alarm does not work; when the intake airflow pressure is higher than the first pressure threshold range or lower than the first pressure threshold range, the contacts in the electrical contact pressure gauge 02 switch from an open state to a closed state, and the alarm 03 in the self-test alarm works.

[0048] Step S4: After the airflow distribution device is used, the airflow is disconnected, the airflow pressure becomes 0, the pressure switch 11 is disconnected, the stop button 04 is pressed, the relay coil 18 is de-energized, the control relay contact 17 is disconnected, the self-locking state of the normally open relay is released, the alarm circuit where the alarm 03 is located is disconnected, and the self-test alarm is deactivated.

[0049] Optionally, after the airflow distribution device is used, disconnect the airflow connection. When the airflow pressure is lower than P0, the pressure switch 11 contacts open. However, since the relay contact 17 is still in the self-locking state, the alarm 03 will continue to alarm. At this time, it is necessary to press the stop button 04 to disconnect the circuit of the relay coil 18, which will disconnect the self-locking of the relay contact 17 and eliminate the alarm.

[0050] Through the above steps S1 to S4, the designed alarm function has a self-test function. That is, when the gas source is connected and the pressure reaches the required pressure between P1 and P2, the alarm will be triggered for a short time when the pressure is between P0 and P1, indicating that the alarm 03 can work normally. The alarm range is determined by the threshold pressures P1 and P2 set by the electric contact pressure gauge 02. After the device enters the normal use state, as long as the pressure is not within the range, a continuous alarm will be triggered, which effectively ensures the safety of the workers.

[0051] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A radioactive contamination protection airflow distribution device with self-checking alarm, characterized in that, include: Air intake port (05) is used to introduce air intake airflow; A filter, connected to the air intake port (05), is used to filter the intake airflow; A self-testing alarm is installed downstream of the filter to detect the airflow pressure of the intake airflow and to activate an alarm when the airflow pressure exceeds a threshold range. The self-testing alarm includes a pressure switch (11), an electrical contact pressure gauge (02), a normally open relay, and an alarm (03). The normally open relay includes a relay contact (17) and a relay coil (18). The relay contact (17) is connected in parallel with the pressure switch (11), and the relay coil (18) is connected in series with the relay contact (17). The parallel structure of the relay contact (17) and the pressure switch (11) and the relay coil (18) form a self-testing circuit. The electrical contact pressure gauge (02) is connected in series with the relay contact (17), and the alarm (03) is connected in series with the electrical contact pressure gauge (02). The relay contact (17), the electrical contact pressure gauge (02), and the alarm (03) form an alarm circuit. The splitter (12) is installed downstream of the self-test alarm and is used to divide the intake airflow into multiple exhaust airflows. The air outlet (06) is connected to the splitter (12) and is used to output multiple streams of the air outlet.

2. The radioactive contamination protection airflow distribution device with self-checking alarm as described in claim 1, characterized in that, The self-test alarm also includes: The stop button (04) is connected in series with the relay coil (18) and the pressure switch (11) to disconnect the current path of the relay coil (18) and stop the alarm from working.

3. A radioactive contamination protection airflow distribution device with self-checking alarm as described in claim 2, characterized in that, The self-test alarm also includes: The battery (13), connected in series with the stop button (04), is used to power the self-test alarm.

4. The radioactive contamination protection airflow distribution device with self-checking alarm according to claim 1, characterized in that, The filter includes: A primary filter (08) is installed on one side of the air inlet (05) for filtering solid particles; A secondary filter (09) is installed downstream of the primary filter (08) for filtering liquid particles.

5. A radioactive contamination protection airflow distribution device with self-checking alarm as described in claim 1, characterized in that, Also includes: A pressure regulating valve (10) is located between the filter and the distributor (12) and is set in parallel with the self-test alarm. It is used to regulate the air pressure of the intake airflow entering the distributor (12).

6. A radioactive contamination protection airflow distribution device with self-checking alarm as described in claim 1, characterized in that, Also includes: The housing (01) is located outside the filter, the self-test alarm and the diverter (12). The air inlet (05) passes through the side wall of the housing (01) and connects the filter on the outside and inside of the housing (01). The air outlet (06) passes through the side wall of the housing (01) and connects the diverter (12) on the outside and inside of the housing (01).

7. A radioactive contamination protection airflow distribution device with self-checking alarm as described in claim 6, characterized in that, The housing (01) includes: The omnidirectional casters (14) are installed on the bottom surface of the housing (01) and located at the four corners of the bottom surface.

8. A radioactive contamination protection airflow distribution device with self-checking alarm according to claim 6, characterized in that, The housing (01) also includes: A multi-functional handle (15) is provided on the top surface of the housing (01) and located at the edge of the top surface.

9. A self-testing alarm method for a radioactive contamination protection airflow distribution device, applied to a self-testing alarm radioactive contamination protection airflow distribution device according to any one of claims 1 to 8, characterized in that, include: A first pressure threshold range is set for the electrical contact pressure gauge (02), and a second pressure threshold is set for the pressure switch (11), wherein the second pressure threshold is lower than the first pressure threshold range; Based on the air intake interface (05), the airflow is connected to the airflow distribution device, and the self-test alarm enters the working state. When the initial airflow is higher than the second pressure threshold and lower than the first pressure threshold range, the pressure switch (11) closes, the self-test circuit where the pressure switch (11) is located forms a circuit, the relay coil (18) is turned on, and the relay contact (17) is closed and self-locked. The electrical contact pressure gauge (02) closes, the alarm circuit where the alarm (03) is located forms a circuit, and the self-test alarm forms a self-test alarm state. The working state of the self-test alarm includes the self-test alarm state and the protection alarm state. After the intake airflow stabilizes, the self-test alarm adjusts the opening and closing state of the contacts inside the electrical contact pressure gauge (02) based on the airflow pressure of the intake airflow, and the self-test alarm forms a protection alarm state. After the airflow distribution device is used, the airflow is disconnected, the airflow pressure becomes 0, the pressure switch (11) is disconnected, the stop button (04) is pressed, the relay coil (18) is de-energized, the relay contact (17) is disconnected, the self-locking state of the normally open relay is released, the alarm circuit where the alarm (03) is located is disconnected, and the self-test alarm is deactivated.

10. The self-test alarm method for a radioactive contamination protection airflow distribution device according to claim 9, characterized in that, After the intake airflow stabilizes, the self-test alarm adjusts the opening and closing state of the contacts inside the electrical contact pressure gauge (02) and the opening and closing state of the pressure switch (11) based on the airflow pressure of the intake airflow. The self-test alarm then forms a protective alarm state, including: When the airflow pressure of the intake airflow is within the first pressure threshold range, the contact in the electrical contact pressure gauge (02) switches from the closed state to the open state, and the alarm (03) in the self-test alarm does not work. When the airflow pressure of the intake airflow is higher than or lower than the first pressure threshold range, the contact in the electrical contact pressure gauge (02) switches from the open state to the closed state, and the alarm (03) in the self-test alarm device is activated.

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