Air supply quantity testing device for power air supply filtering type respirator

Abstract

The utility model belongs to the technical field of respirator inspection, and particularly relates to an air supply quantity testing device for a power air supply filter type respirator, which comprises a head mold, an air port on the head mold is connected with a suction fan through a testing pipeline, a flowmeter, a pressure difference transmitter and an electric ball valve I are arranged on the testing pipeline, and the electric ball valve I is electrically connected with the pressure difference transmitter. By combining the suction fan, the flow meter, the pressure difference transmitter and the electric ball valve, the internal and external pressure difference of the test system can be adjusted and kept to be 0 in real time, and the accuracy of the air supply amount in the test process is ensured. Through real-time monitoring of the pressure difference transmitter and automatic adjustment of the electric ball valve, the test is more accurate, and test errors caused by pressure difference are effectively avoided.

Description

Technical Field

[0001] The utility model relates to an air supply volume testing device for a powered air-purifying respirator, belonging to the technical field of respirator inspection. Background Art

[0002] A powered air-purifying respirator (PAPR) is a respiratory protection device. It provides power through a built-in blower or compressor, sucks in air from the external environment, and conducts multi-stage filtration through a filtering device to intercept harmful substances in the air. Finally, the purified air is conveyed into the mask of the wearer through a pipeline system, thereby ensuring the breathing safety of the wearer.

[0003] The air supply volume of a powered air-purifying respirator needs to be tested to determine whether it meets the usage requirements. And the test needs to be carried out at room temperature (the temperature range is 25 ± 5°C to ensure the accuracy of the test results) and under the state that the pressure difference inside and outside the test system is 0 (during the test process, it is necessary to ensure that there is no pressure difference between the inside and outside of the respirator mask to avoid the influence of the pressure difference on the air supply volume test results). In addition, during the test, when the built-in blower or compressor supplies air to the mask, another blower is required to suck air into the mask to reduce the losses of the air supply pipeline system and the test pipeline system and ensure the accuracy of the test results.

[0004] Currently, such equipment is lacking. Content of the Utility Model

[0005] According to the deficiencies in the above prior art, the technical problem to be solved by the utility model is to provide a powered air-purifying respirator air supply volume testing device that can meet the test requirements.

[0006] The powered air-purifying respirator air supply volume testing device described in the utility model includes a head mold. The air port on the head mold is connected to an air suction fan through a test pipeline. A flow meter, a differential pressure transmitter, and an electric ball valve I are arranged on the test pipeline. The electric ball valve I is electrically connected to the differential pressure transmitter.

[0007] During the test, the mask of the test sample is correctly and tightly worn on the head model, the air supply device of the respirator is turned on, and air is supplied into the mask; the suction fan of the test device is turned on, and air is sucked into the mask. The flow meter on the test pipeline displays the air supply volume of the test sample (the power of the suction fan of the test device needs to be greater than the power of the fan of the respirator itself, so that the suction volume can be adjusted to reduce the suction volume and ensure that the suction volume is equal to the air supply volume). In this process, the differential pressure transmitter can monitor the air pressure in the test pipeline in real time. If the monitoring result is negative pressure, that is, the suction volume of the test device is greater than the air supply volume of the respirator, the differential pressure transmitter sends a signal, and the flux of the electric ball valve I decreases until the monitoring result is "0" (that is, the difference compared with the outside world is 0) and no longer changes, indicating that the suction volume is equal to the air supply volume. At this time, the flow meter displays the accurate air supply volume of the test sample.

[0008] In addition, an electric ball valve II is provided between the electric ball valve I and the suction fan. The electric ball valve II is connected in parallel with the test pipeline and is also electrically connected to the differential pressure transmitter. Since the flux of the electric ball valve I decreases, the suction volume decreases, while the fan speed is constant, which will have an adverse effect on the suction fan. Therefore, the electric ball valve II is set for air supply, and the increase in the flux of the electric ball valve II is equal to the decrease in the flux of the electric ball valve I, to avoid damage to the suction fan.

[0009] The utility model also comprises a cabinet, a head mold is located at the top outside the cabinet, a test pipeline is located inside the cabinet, and a flow meter, a differential pressure transmitter, a switch device and the like are located on a panel on the front side of the cabinet.

[0010] Preferably, a sample placement platform is provided on one side of the cabinet, and an air supply device is used to place the samples.

[0011] Wherein, the sample placement platform is suspended.

[0012] Preferably, the sample placement platform is flush with the top surface of the cabinet.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. Accurately test the air supply volume: By combining the suction fan, flow meter, differential pressure transmitter and electric ball valve, the internal and external pressure difference of the test system can be adjusted and maintained at 0 in real time to ensure the accuracy of the air supply volume during the test. The real-time monitoring of the differential pressure transmitter and the automatic adjustment of the electric ball valve make the test more accurate and effectively avoid the test error caused by the pressure difference.

[0015] 2. Protect the test equipment: add electric ball valve II as an air supply device. When the flux of electric ball valve I decreases, electric ball valve II automatically increases the flux to keep the working state of the suction fan stable, avoiding damage to the suction fan caused by excessive or insufficient suction volume, and extending the service life of the equipment.

[0016] 3. Rational structural design: The head mold is placed on the top of the cabinet body, and the test pipelines and key test instruments (such as flow meters and differential pressure transmitters) are placed inside the cabinet body, which is convenient for operation and protects the test equipment, improving the cleanliness and safety of the test environment. At the same time, the design of the sample placement platform on the cabinet body enables the convenient handling of the sample air supply device.

[0017] 4. Convenient operation: The automatic control of the differential pressure transmitter and the electric ball valve is realized through electrical connection, simplifying the test process, reducing the errors caused by manual operation, and improving the test efficiency. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the pipeline connection principle of the present utility model;

[0019] Figure 2 is a schematic diagram of the front structure of the cabinet body.

[0020] In the figure: 1. Head mold; 2. Flow meter; 3. Suction fan; 4. Differential pressure transmitter; 5. Electric ball valve I; 6. Electric ball valve II; 7. Face mask; 8. Air supply device; 9. Cabinet body; 10. Sample placement platform. Detailed Embodiment

[0021] The following further describes the present utility model in conjunction with specific embodiments.

[0022] However, the description of the present utility model is only an embodiment of the structural and even functional description, and the scope of the rights of the present utility model is not limited by the embodiments described in the text.

[0023] For example, multiple embodiments can have various changes and various forms, and it should be understood that the scope of the rights of the present utility model includes equivalents that can implement the technical idea.

[0024] Such as Figure 1 、 2 As shown, this embodiment is realized through the following technical solutions: It includes a head mold 1. The air port on the head mold 1 is connected to a suction fan 3 through a test pipeline. A flow meter 2, a differential pressure transmitter 4, and an electric ball valve I 5 are provided on the test pipeline. An electric ball valve II 6 is provided between the electric ball valve I 5 and the suction fan 3. The electric ball valve II 6 is in parallel with the test pipeline. Both the electric ball valve I 5 and the electric ball valve II 6 are electrically connected to the differential pressure transmitter 4.

[0025] This embodiment also includes a cabinet 9, wherein the head mold 1 is located at the top outside the cabinet 9, the test pipeline is located inside the cabinet 9, and the flow meter 2, the differential pressure transmitter 4, the switch device, etc. are located on the panel on the front of the cabinet 9. In addition, a sample placement platform 10 is provided on one side of the cabinet 9. The sample placement platform 10 is suspended and flush with the top surface of the cabinet 9, and is used to place the air supply device 8 of the sample, which can be easily taken and placed.

[0026] During the test, the mask 7 of the test sample is correctly and tightly worn on the head mold 1, the air supply device 8 of the respirator is turned on, and air is supplied to the mask 7; the suction fan 3 of the test device is turned on, and air is sucked into the mask 7, and the flow meter 2 on the test pipeline displays the air supply of the test sample (the power of the suction fan of the test device needs to be greater than the power of the fan of the respirator itself, so that the suction volume can be adjusted to reduce the suction volume and ensure that the suction volume is equal to the air supply volume). In this process, the differential pressure transmitter 4 can monitor the air pressure in the test pipeline in real time. If the monitoring result is negative pressure, that is, the suction volume of the test device is greater than the air supply volume of the respirator, the differential pressure transmitter 4 sends a signal, and the flux of the electric ball valve I5 is reduced until the monitoring result is "0" (that is, the difference compared with the outside world is 0) and no longer changes, which means that the suction volume is equal to the air supply volume. At this time, the flow meter 2 displays the accurate air supply volume of the test sample.

[0027] Of course, the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and any equivalent changes and improvements made by ordinary technicians in the technical field within the essential scope of the present invention shall fall within the scope of the patent coverage of the present invention.

Claims

1. A powered air-purifying respirator air volume test device, characterized in that: The invention comprises a head mold (1), wherein the air port on the head mold (1) is connected to a suction fan (3) through a test pipeline, and a flow meter (2), a pressure differential transmitter (4) and an electric ball valve I (5) are arranged on the test pipeline, and the electric ball valve I (5) is electrically connected to the pressure differential transmitter (4); an electric ball valve II (6) is arranged between the electric ball valve I (5) and the suction fan (3), and the electric ball valve II (6) is connected in parallel with the test pipeline, and the electric ball valve II (6) is also electrically connected to the pressure differential transmitter (4).

2. The powered air-purifying respirator air volume test device according to claim 1, characterized in that: It also includes a cabinet (9), a head mold (1) is located at the top outside the cabinet (9), a test pipeline is located inside the cabinet (9), and a flow meter (2) and a differential pressure transmitter (4) are located on a panel on the front of the cabinet (9).

3. The powered air-purifying respirator air volume test device according to claim 2, characterized in that: A sample placement platform (10) is provided on one side of the cabinet (9).

4. The powered air-purifying respirator air volume test device according to claim 3, characterized in that: The sample placement platform (10) is suspended in the air.

5. The device for testing the air flow rate of a powered air-purifying respirator according to claim 3 or 4, characterized in that: The sample placement platform (10) is flush with the top surface of the cabinet (9).

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