Sampling device for validity verification of protective poison filtering box for breathing mask

Abstract

The utility model discloses a protective poison filter box effectiveness verification sampling device for breathing mask, including sampling box and be equipped with the dual-purpose air pump and sampling bag in the sampling box, the dual-purpose air pump is equipped with pump chamber, on the pump chamber is equipped with air inlet and air outlet, air inlet and air outlet both are equipped with one-way valve, the sampling bag is equipped with the sampling bag, and the sampling bag is equipped with the sampling bag. A piston is slidably arranged in the pump cavity in a sealed mode, the piston is connected with a piston rod, the piston rod is connected with a driving component, the driving component can drive the piston to move in a reciprocating mode so as to achieve alternate air exhaust and air inflation processes, the air inlet is connected with a sampling inlet through an air exhaust pipeline, and the sampling inlet is used for being connected with a poison filtering box. The air outlet is connected with an inlet of the sampling bag through an air inlet pipeline, an air inlet valve is arranged on the air inlet pipeline, an outlet of the sampling bag is connected with the sampling outlet through an air outlet pipeline, and an air outlet valve is arranged on the air outlet pipeline. The sampling process can meet the non-uniform-speed gas filtering characteristic of the gas filtering box in the actual working process, and the volume of the sampled gas can be conveniently metered.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of respiratory protection, in particular to a protective filter canister effectiveness verification sampling device for respiratory mask. BACKGROUND

[0002] The protective filter canister is an important component of the gas mask, which is usually composed of a filter canister and a mask body. The mask body plays a sealing role to isolate air, and the filter canister is responsible for filtering harmful gases and dust in the air to ensure that the wearer inhales purified air.

[0003] At present, the effectiveness verification process of the protective filter canister uses a constant-speed gas sampling pump to sample, and the sampled gas is directly introduced into a mercury enrichment tube. Then, the mercury content in the mercury enrichment tube is measured by a mercury detector to verify the effectiveness of the filter canister. However, the existing sampling method uses a constant-speed gas sampling pump, which does not conform to the non-constant-speed gas filtration characteristics in the actual working process of the filter canister for respiratory protection masks. Secondly, the sampling rate of the constant-speed gas sampling pump usually differs greatly from the ventilation rate under the actual working condition of the protective filter canister. The above two problems will cause deviation in the determination of the effectiveness of the protective filter canister. SUMMARY

[0004] The utility model aims to provide a protective filter canister effectiveness verification sampling device for respiratory mask, the core principle is to simulate the actual working condition of the protective filter canister through the pumping and charging dual-purpose air pump, and to use the gas sampling bag as a quantitative and transfer device for sampling, so as to solve the deviation in the effectiveness determination caused by the mismatch between the sampling rate and the ventilation rate under the actual working condition of the filter canister.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0006] The utility model provides a protective filter canister effectiveness verification sampling device for respiratory mask, which comprises a sampling box, a pumping and charging dual-purpose air pump arranged in the sampling box, and a sampling bag. The pumping and charging dual-purpose air pump has a pump cavity, and an air inlet and an air outlet are arranged on the pump cavity. A one-way valve is arranged at the air inlet and the air outlet. A piston is sealingly and slidably arranged in the pump cavity. The piston is connected with a piston rod, and the piston rod is connected with a driving component. The driving component can drive the piston to reciprocate to realize the alternating pumping and charging process. The air inlet is connected with a sampling inlet on the side wall of the sampling box through a pumping pipeline. The sampling inlet is used to connect the filter canister to sample the gas filtered by the filter canister. The air outlet is connected with the inlet of the sampling bag through an air inlet pipeline. An air inlet valve is arranged on the air inlet pipeline. The outlet of the sampling bag is connected with a sampling outlet on the side wall of the sampling box through an air outlet pipeline. An air outlet valve is arranged on the air outlet pipeline.

[0007] In an embodiment, the sampling inlet is connected to the canister through a sampling tube, which can be sealed to the outer circumferential surface of the canister.

[0008] In an embodiment, the volume of the pump cavity is 0.5-2L.

[0009] In an embodiment, the volume of the sampling bag is 5-20L.

[0010] In an embodiment, the driving component is a handle, a pedal or an electric push rod; when the driving component is a handle, the handle is held to drive the piston to move back and forth; when the driving component is a pedal, a return spring is arranged between the piston and the bottom surface of the pump cavity, the pedal is pressed to compress the return spring, and the piston is returned by the return spring after the pedal is released; when the driving component is an electric push rod, the electric push rod drives the piston to move back and forth.

[0011] In an embodiment, the air inlet valve and the air outlet valve are both electromagnetic valves or manually controlled valves.

[0012] In an embodiment, when the driving component is an electric push rod and the air inlet valve and the air outlet valve are both electromagnetic valves, a control panel is arranged on the sampling box, and the electric push rod, the air inlet valve and the air outlet valve can be controlled through the control panel.

[0013] The present application has the following technical effects compared with the prior art:

[0014] The present application uses the pumping and charging dual-purpose air pump to realize alternating pumping and charging processes, thereby simulating the non-uniform speed filtering sampling of the canister according to the human respiratory characteristics, meeting the non-uniform gas filtering characteristics in the actual working process of the canister, collecting the gas samples in the gas sampling bag, conveniently measuring the gas volume of the sampling bag, and facilitating subsequent gas detection to verify the effectiveness of the canister. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 FIG. 1 is a schematic diagram of a protective canister effectiveness verification sampling device for a respiratory mask according to an embodiment of the present application;

[0017] Figure 2This is a schematic diagram of a sampling device for verifying the effectiveness of a protective filter cartridge for a respirator according to another embodiment of the present invention.

[0018] In the diagram: 1-Sampling box, 2-Dual-purpose air pump for filling and emptying, 3-Sampling bag, 4-Pump chamber, 5-Air inlet, 6-Air outlet, 7-Air inlet check valve, 8-Air outlet check valve, 9-Piston, 10-Piston rod, 11-Air extraction line, 12-Sampling inlet, 13-Filter cartridge, 14-Air inlet line, 15-Air inlet valve, 16-Air outlet line, 17-Sampling outlet, 18-Air outlet valve, 19-Sampling tube, 20-Reset spring, 21-Electric push rod, 22-Control panel, 23-Pedal. Detailed Implementation

[0019] 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.

[0020] The purpose of this invention is to provide a sampling device for verifying the effectiveness of a protective filter cartridge for a breathing mask, in order to solve the problems existing in the prior art. The sampling process can meet the non-uniform gas filtration characteristics in the actual working process of the filter cartridge, and facilitate the measurement of the gas volume sampled.

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 As shown, this embodiment provides a sampling device for verifying the effectiveness of a protective filter cartridge for a respirator, including a sampling box 1, a pump 2 for filling and pumping, and a sampling bag 3 disposed within the sampling box 1. The pump 2 has a pump chamber 4, with an inlet 5 and an outlet 6. Both the inlet 5 and the outlet 6 are equipped with one-way valves, namely an inlet one-way valve 7 and an outlet one-way valve 8. A piston 9 is slidably and sealed within the pump chamber 4. The piston 9 is connected to a piston rod 10, and the piston rod 10 is connected to a driving component. The driving component can... The piston 9 is driven to reciprocate to achieve alternating suction and inflation processes. The air inlet 5 is connected to the sampling inlet 12 on the side wall of the sampling box 1 through the suction pipe 11. The sampling inlet 12 is used to connect to the filter cartridge 13 to sample the gas filtered by the filter cartridge 13. The air outlet 6 is connected to the inlet of the sampling bag 3 through the air inlet pipe 14. The air inlet pipe 14 is equipped with an air inlet valve 15. The outlet of the sampling bag 3 is connected to the sampling outlet 17 on the side wall of the sampling box 1 through the air outlet pipe 16. The air outlet pipe 16 is equipped with an air outlet valve 18.

[0023] In this embodiment, the sampling inlet 12 is connected to the filter cartridge 13 via a sampling tube 19, which can be sealed onto the outer circumferential surface of the filter cartridge 13. After the sampling tube 19 is sealed onto the outer circumferential surface of the filter cartridge 13, it can be secured with an elastic band.

[0024] In this embodiment, the volume of the pump chamber 4 is 0.5-2L, preferably 1L. The volume of the sampling bag 3 is 5-20L, preferably 10L.

[0025] In this embodiment, the driving component is an electric push rod 21, which drives the piston 9 to reciprocate. Both the inlet valve 15 and the outlet valve 18 are solenoid valves.

[0026] In this embodiment, the sampling box 1 is equipped with a control panel 22, which can control the electric push rod, the air inlet valve 15 and the air outlet valve 18 respectively.

[0027] During sampling, the filter cartridge 13 is connected to the sampling inlet 12 via the sampling tube 19. The inlet valve 15 is opened, and the outlet valve 18 is closed. When the piston 9 moves upward, the gas is filtered by the filter cartridge 13 and enters the pump chamber 4 through the inlet check valve 7. When the piston 9 moves downward, the gas in the pump chamber 4 is discharged through the outlet check valve 8 and enters the sampling bag 3. By driving the piston 9 to move back and forth, the filter cartridge 13 is subjected to non-uniform filtration sampling, simulating human breathing characteristics, until the sampling bag 3 is full of gas. Then, the inlet valve 15 is closed, and the sampling is completed. During gas detection, the outlet valve 18 is opened to detect the gas composition in the sampling bag 3 to verify the effectiveness of the filter cartridge 13.

[0028] During sampling, the extension frequency, speed and stroke of the electric push rod can be set through the control panel 22, thereby controlling the piston 9 accordingly to achieve control of the sampling frequency, speed and single sampling volume, which facilitates non-uniform filtration sampling of the filter cartridge 13 by simulating human breathing characteristics.

[0029] In other embodiments, the driving component may also be a handle or pedal 23. When the driving component is a handle, the piston 9 is driven to reciprocate by holding the handle. Figure 2 As shown, when the driving component is a pedal 23, a return spring 20 is provided between the piston 9 and the bottom surface of the pump chamber 4. The return spring 20 is compressed by stepping on the pedal 23, and the piston 9 is reset by the return spring 20 after being released. When the driving component is a handle or pedal 23, the handle or pedal 23 is located outside the sampling box 1 to facilitate manual driving of the piston 9.

[0030] In other embodiments, such as Figure 2As shown, the inlet valve 15 and the outlet valve 18 can also be manually controlled valves, with their handwheels located inside the sampling box 1. The handwheels can be operated by opening the door of the sampling box 1. Alternatively, the handwheels of each manual control valve can be located outside the sampling box 1, in which case they can be operated from outside the sampling box 1.

[0031] If manual or foot-operated drive is used, the reciprocating movement of piston 9 is manually controlled to simulate human breathing characteristics and perform non-uniform filtration sampling on filter cartridge 13.

[0032] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A sampling device for verifying the effectiveness of a protective filter cartridge for a respirator, characterized in that: The system includes a sampling box, a dual-purpose pump for both pumping and filling, and a sampling bag disposed within the sampling box. The pump has a pump chamber with an inlet and an outlet, both equipped with one-way valves. A piston is slidably mounted within the pump chamber, connected to a piston rod, which in turn is connected to a drive component. The drive component drives the piston to reciprocate, alternating between pumping and filling. The inlet is connected to a sampling inlet on the side wall of the sampling box via a pumping pipe. This sampling inlet is used to connect to a filter cartridge to sample gas filtered by the cartridge. The outlet is connected to the inlet of the sampling bag via an inlet pipe equipped with an inlet valve. The outlet of the sampling bag is connected to the sampling outlet on the side wall of the sampling box via an outlet pipe equipped with an outlet valve.

2. The sampling device for verifying the effectiveness of the protective filter cartridge for a respirator according to claim 1, characterized in that: The sampling inlet is connected to the filter cartridge via a sampling tube, which can be sealed around the outer periphery of the filter cartridge.

3. The sampling device for verifying the effectiveness of the protective filter cartridge for a respirator according to claim 1, characterized in that: The volume of the pump chamber is 0.5-2L.

4. The sampling device for verifying the effectiveness of the protective filter cartridge for a respirator according to claim 1, characterized in that: The volume of the sampling bag is 5-20L.

5. The sampling device for verifying the effectiveness of the protective filter cartridge for a respirator according to claim 1, characterized in that: The driving component is a handle, a pedal, or an electric push rod; when the driving component is a handle, the piston is driven to reciprocate by holding the handle; when the driving component is a pedal, a return spring is provided between the piston and the bottom surface of the pump chamber, the return spring is compressed by stepping on the pedal, and the piston is reset by the return spring after being released; when the driving component is an electric push rod, the piston is driven to reciprocate by the electric push rod.

6. The sampling device for verifying the effectiveness of a protective filter cartridge for a respirator according to claim 5, characterized in that: Both the inlet valve and the outlet valve are solenoid valves or manually controlled valves.

7. The sampling device for verifying the effectiveness of a protective filter cartridge for a respirator according to claim 6, characterized in that: When the driving component is an electric push rod and both the inlet valve and the outlet valve are solenoid valves, the sampling box is equipped with a control panel, through which the electric push rod, the inlet valve and the outlet valve can be controlled respectively.

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