Fire fighting mask breathing valve air tightness detector

Abstract

The utility model discloses a kind of fire mask breathing valve air tightness detector, it is related to fire equipment detection technical field, the device includes humanoid head model, voice coil motor drive unit, three valve linkage plugging mechanism and positive and negative pressure detection system, core innovation is in to adopt single voice coil motor drive three valve linkage plugging mechanism, through the clever design of rotor connecting block, central main push rod and symmetrical linkage swing pole group, the collaborative movement of expiration valve pressure plate and two inhalation valve pressure plate is realized;The utility model is compact in structure, low in cost, action accurate synchronization, using the accurate force control ability of voice coil motor, both can guarantee reliable sealing and avoid damage valve, effectively solve the problem that traditional multi-cylinder scheme structure is complex, control precision is insufficient, provide an advanced solution for fire mask breathing valve air tightness detection.

Description

Technical Field

[0001] This utility model relates to the technical field of fire equipment testing equipment, and in particular to a special device for testing the airtightness of the breathing valve of a fire mask. Background Technology

[0002] Fire masks are essential equipment for protecting firefighters' respiratory systems. The airtightness of their breathing valves is directly related to the user's life safety. Breathing valves typically include one exhalation valve and two inhalation valves, each of which needs to be tested for airtightness. Traditional detection methods often rely on manual operation, which is inefficient and the results are affected by subjective factors. Therefore, there is an urgent need in this field for a compact, precise, and efficient breathing valve detection device. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a fire mask breathing valve airtightness tester with a compact structure, precise operation, and controllable clamping force.

[0004] To solve the above problems, this utility model provides a fire mask breathing valve air tightness tester, which includes a human head model, a positive and negative pressure detection system, a voice coil motor drive unit, and a three-valve linkage sealing mechanism. The voice coil motor drive unit includes a voice coil motor and a fixed bracket, wherein the stator of the voice coil motor is fixedly mounted on the fixed bracket; The three-valve linkage sealing mechanism includes a moving part connecting block, a central main push rod, and a pair of symmetrically arranged linkage swing rods; the moving part connecting block is fixedly connected to the moving part of the voice coil motor; the rear end of the central main push rod is connected to the moving part connecting block, and the front end is connected to an exhalation valve pressure plate; the linkage swing rods include a crank arm and a pull rod, the rear end of the crank arm is hinged to the front end of the central main push rod, the rear end of the pull rod is hinged to the fixed bracket, and the front end is hinged to the center of the crank arm; the front end of the crank arm is connected to an inhalation valve pressure plate. The positive and negative pressure detection system includes a positive pressure air source, a negative pressure generator, and a control system. The positive pressure air source and the negative pressure generator are both connected to the mouth and nose cavities of the humanoid head model. The control system is electrically connected to the voice coil motor, the positive pressure air source, and the negative pressure generator.

[0005] Furthermore, the present invention provides a fire mask breathing valve airtightness tester, wherein elastic sealing gaskets are embedded on the contact surfaces of the exhalation valve pressure plate and the inhalation valve pressure plate.

[0006] Furthermore, this utility model provides a fire mask breathing valve airtightness tester, wherein the voice coil motor is a closed-loop controlled voice coil motor with a built-in position sensor and force sensor.

[0007] Furthermore, this utility model provides a fire mask breathing valve airtightness tester, wherein the surface of the human head model is covered with a silicone layer.

[0008] The airtightness tester for the breathing valve of a fire mask disclosed in this application has the following advantages compared with the prior art: 1. Compact structure and low cost: The core innovation of this utility model lies in the use of a single voice coil motor to drive a three-valve linkage sealing mechanism. Through the ingenious linkage design, the coordinated movement of the three sealing pressure plates is realized, which greatly simplifies the structure and reduces manufacturing costs and maintenance difficulty. 2. Precise action and good synchronization: The mechanical linkage mechanism ensures the strict synchronization and determinism of the movement of the three sealing pressure plates, eliminating the timing error problems that may occur with multiple actuators, and making the action extremely reliable; 3. Controllable clamping force, protecting the valve: The voice coil motor has precise force control capability and can switch to force control mode the moment the pressure plate contacts the valve, providing a constant and smooth sealing force. This ensures reliable sealing and avoids damage to the valve from rigid impacts, solving the technical problem of the difficulty in accurately controlling the clamping force of traditional cylinder drives. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of a fire mask breathing valve airtightness tester in use according to the present invention; Figure 2 This is a schematic diagram of the structure of a fire mask breathing valve airtightness tester according to the present invention.

[0010] The components include: 1. Human head model; 2. Voice coil motor; 3. Fixed bracket; 4. Moving element connecting block; 5. Central main push rod; 6. Exhalation valve pressure plate; 7. Crank arm; 8. Pull rod; 9. Inhalation valve pressure plate; 10. Elastic sealing gasket. Detailed Implementation

[0011] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0012] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0013] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0014] like Figure 1 and Figure 2 As shown, this embodiment provides a fire mask breathing valve linkage sealing detection device driven by a voice coil motor 2, which includes a human head model 1, a positive and negative pressure detection system, a voice coil motor 2 drive unit, and a three-valve linkage sealing mechanism; the surface of the human head model 1 is covered with a silicone layer; The voice coil motor 2 drive unit includes a voice coil motor 2 and a fixed bracket 3. The stator of the voice coil motor 2 is fixedly installed on the fixed bracket 3. The voice coil motor 2 is a closed-loop controlled voice coil motor 2, and has a built-in position sensor and force sensor. The three-valve linkage sealing mechanism includes a moving part connecting block 4, a central main push rod 5, and a pair of symmetrically arranged linkage swing rods. The moving part connecting block 4 is fixedly connected to the moving part of the voice coil motor 2. The rear end of the central main push rod 5 is connected to the moving part connecting block 4, and the front end is connected to an exhalation valve pressure plate 6. The linkage swing rods include a crank arm 7 and a pull rod 8. The rear end of the crank arm 7 is hinged to the front end of the central main push rod 5. The rear end of the pull rod 8 is hinged to the fixed bracket 3, and the front end is hinged to the center of the crank arm 7. The front end of the crank arm 7 is connected to an inhalation valve pressure plate 9. Elastic sealing gaskets 10 are embedded on the contact surfaces of the exhalation valve pressure plate 6 and the inhalation valve pressure plate 9. The positive and negative pressure detection system includes a positive pressure air source, a negative pressure generator, and a control system. The positive pressure air source and the negative pressure generator are both connected to the mouth and nose cavities of the humanoid head model 1. The control system is electrically connected to the voice coil motor 2, the positive pressure air source, and the negative pressure generator.

[0015] In actual production, it mainly includes a human head model 1, a voice coil motor 2 drive unit, a three-valve linkage sealing mechanism, and a positive and negative pressure detection system; The simulated human head model 1 is made of engineering plastic and covered with a silicone layer to simulate the texture of a human face. The mouth and nose cavities are connected to the detection airway. The model is designed strictly according to the standard human head size to ensure a good seal with the edge of the fire mask. The voice coil motor 2 drive unit includes a voice coil motor 2 and a fixed bracket 3. The stator of the voice coil motor 2 is fixedly mounted on the fixed bracket 3, and its mover can perform precise linear reciprocating motion. The mover connecting block 4 is fixedly connected to the mover. The three-valve linkage sealing mechanism is the core innovation of this utility model. The rear end of the central main push rod 5 is hinged to the moving part connecting block 4, and the front end of the central main push rod 5 is connected to the exhalation valve pressure plate 6. The contact surface of the exhalation valve pressure plate 6 is fitted with an elastic sealing gasket 10. Two sets of symmetrically arranged linkage rocker arm groups, each set of linkage rocker arm groups includes a crank arm 7 and a pull rod 8. The rear end of the crank arm 7 is hinged to the front end of the central main push rod 5. The rear end of the pull rod 8 is hinged to the fixed bracket 3 and the front end is hinged to the center of the crank arm 7. The front end of the crank arm 7 is connected to an air intake valve pressure plate 9. The positive and negative pressure detection system includes a positive pressure air source, a negative pressure generator, and a control system. The positive pressure air source and the negative pressure generator are both connected to the mouth and nose cavities of the humanoid head model 1. The control system is electrically connected to the voice coil motor 2, the positive pressure air source, the negative pressure generator, and the pressure sensor, respectively.

[0016] Work process: The operator puts the fire mask on the mannequin head 1. At the start of the test, the control system controls the mover of the voice coil motor 2 to move forward, causing the exhalation valve pressure plate 6 to press the exhalation valve tightly through the three-valve linkage sealing mechanism. At the same time, the inhalation valve pressure plate 9 is raised, and the positive pressure source fills the mask with positive pressure to test the sealing performance of the inhalation valve. After completion, the mover of the voice coil motor 2 moves backward, causing the inhalation valve pressure plate 9 to press the inhalation valve tightly, and at the same time, the exhalation valve pressure plate 6 is raised. At this time, the negative pressure generator draws negative pressure into the mask to test the sealing performance of the exhalation valve. Throughout the process, the voice coil motor 2 can use force control mode to ensure that the clamping force is constant and moderate.

[0017] Any aspects not detailed in this application are well-known to those skilled in the art.

[0018] The preferred embodiments of this application have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this application without inventive effort. Therefore, any technical solutions that can be obtained by those skilled in the art based on the concept of this application through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A tester for the airtightness of a fire mask breathing valve, characterized in that, Including a human head model (1), a positive and negative pressure detection system, a voice coil motor drive unit and a three-valve linkage sealing mechanism; The voice coil motor drive unit includes a voice coil motor (2) and a fixed bracket (3), and the stator of the voice coil motor (2) is fixedly installed on the fixed bracket (3). The three-valve linkage sealing mechanism includes a moving part connecting block (4), a central main push rod (5), and a pair of symmetrically arranged linkage swing rods; the moving part connecting block (4) is fixedly connected to the moving part of the voice coil motor (2); the rear end of the central main push rod (5) is connected to the moving part connecting block (4), and the front end is connected to an exhalation valve pressure plate (6); the linkage swing rods include a crank arm (7) and a pull rod (8), the rear end of the crank arm (7) is hinged to the front end of the central main push rod (5), the rear end of the pull rod (8) is hinged to the fixed bracket (3), and the front end is hinged to the center of the crank arm (7), and the front end of the crank arm (7) is connected to an inhalation valve pressure plate (9); The positive and negative pressure detection system includes a positive pressure air source, a negative pressure generator and a control system. The positive pressure air source and the negative pressure generator are both connected to the mouth and nose cavity of the humanoid head model (1). The control system is electrically connected to the voice coil motor (2), the positive pressure air source and the negative pressure generator respectively.

2. The airtightness tester for the breathing valve of a fire mask according to claim 1, characterized in that, Elastic sealing gaskets (10) are embedded on the contact surfaces of the exhalation valve pressure plate (6) and the inhalation valve pressure plate (9).

3. The airtightness tester for the breathing valve of a fire mask according to claim 1, characterized in that, The voice coil motor (2) is a closed-loop controlled voice coil motor (2) with a built-in position sensor and force sensor.

4. The airtightness tester for the breathing valve of a fire mask according to claim 1, characterized in that, The surface of the humanoid head model (1) is covered with a silicone layer.

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