TWI717567B - Respiratory protection - Google Patents

Abstract

[Problem] To provide a respiratory protective device that can instantly detect the internal pressure of the face body even for the wearer's irregular breathing, which can provide comfortable breathing without suffocation, and has a simple structure and easy operation. [Solution] It is composed of a face body (1) that at least covers the wearer's mouth and nose, a wearing belt (2), and a filter device (4) equipped with an electric fan unit (3). The face body (1) is designed There is a suction valve (5) and an exhaust valve (6), and an air pressure sensor (7) is installed on the inner wall. Furthermore, a battery unit (13) for supplying electric power to the electric fan unit (3) and the air pressure sensor (7), and an electronic circuit for controlling the air pressure sensor (7) are assembled on the surface body (1).

Description

Respiratory protection

The present invention relates to a respiratory protective device that can be used as a dust mask or a gas mask in places where dust or toxic gas is generated in factories, construction sites, etc.

In the past, this type of breathing protector involves installing an electric fan unit at the center of the face at least covering the nose and mouth of the wearer, and installing a dust-proof or anti-virus filter in front of the electric fan unit. Easy to handle (Patent Document 1).

The above-mentioned breathing protection device can be forced to blow air, so it can eliminate the breathing resistance of the user who passes through the filter to ensure smooth breathing. However, because the user’s breathing requirements are often forced to blow, it has an electric fan unit The battery life or the filter life of the filter device becomes short.

Therefore, a breathing protector has been developed in which the electric fan operates only when the user breathes in and does not operate when the breath is exhausted. The above-mentioned breathing protector is provided with an air introduction path in the face body, and the air inlet path is connected to the outlet of the electric fan unit separated from the face body. Moreover, a support is provided between the outlet and the inlet of the electric fan unit Line, a differential pressure sensor is provided here, and the control of the differential pressure sensor reduces the air volume of the electric fan when the pressure difference increases, and increases the air volume of the electric fan when the pressure difference decreases (Patent Document 2 ).

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Utility Model Registration No. 2549870

[Patent Document 2] Japanese Patent No. 2858131

In the breathing protector described in Patent Document 2, the face body and the electric fan unit are separated, so that the two are connected through an air introduction path. Therefore, it is difficult to measure the correct differential pressure between the face body side and the electric fan unit side. The inability to properly control the air volume of the electric fan has the problem of not being able to breathe comfortably without suffocation for the wearer.

Therefore, in order to accurately measure the correct differential pressure between the face body side and the electric fan unit side of the breathing protector, in recent years, a photo interrupter that detects the action of the exhaust valve or suction valve of the face body has been developed. The sensor, or the sensor formed by the Hall element, is installed in the surface body. Through the detection of these sensors, power is supplied to make the electric fan operate normally when inhaling. When stopping or reducing the power supply of the electric fan.

However, it is difficult to detect subtle changes in the internal pressure of the surface by using a photo interrupter to lightly detect the operation of the suction valve, that is, the diaphragm valve, and there is a problem in that the accuracy of the valve is degraded year by year due to the deterioration of the valve.

In addition, the use of the Hall element to magnetically detect the movement of the magnet on the diaphragm valve will increase the number of parts by installing a magnet on the valve, and has a problem that the structure becomes complicated and difficult to operate.

In addition, both of the aforementioned two indirectly detect the movement of the parts displaced by the wearer's breathing, so there is a problem that the detection sensitivity is reduced or the detection may be delayed.

Therefore, the object of the present invention is to provide a respiratory protective device that directly detects the air pressure in the face with a pressure sensor, so that even for the wearer’s irregular breathing, the internal pressure of the face can be detected immediately, which can become suffocated It is comfortable to breathe, and the structure is simple so the operation is easy.

In addition, the object of the present invention is to provide a respiratory protective device, which can steplessly control the air volume of the electric fan unit through the air pressure sensor installed in the face body, and restrain the electric power by cooperating with the control of the wearer's breathing. The excessive operation of the fan can extend the battery life and suppress the consumption of the filter.

The breathing protector of the present invention is composed of a face body 1, a wearing belt 2, and a filter device 4 equipped with an electric fan unit 3 covering at least the mouth and nose of the wearer. The face body 1 is provided with an inhalation valve 5 and equipped with exhaust valve 6. The air pressure sensor 7 is installed on the inner wall surface. The aforementioned air pressure sensor 7 constantly detects the internal pressure of the surface body 1 and averages the detection information of the surface body 1 as a control The reference pressure is used to steplessly control the air volume of the electric fan unit 3 by the internal pressure of the surface body 1. The air volume control of the electric fan unit 3 mentioned above is to set the control reference pressure in the range of BH pressure to BL pressure. The air volume of the electric fan unit 3 is taken as M% of the full force, and the air volume of the electric fan unit 3 is gradually increased to L before the internal pressure of the face body 1 reaches A pressure lower than the control reference pressure by the wearer’s breathing %. Above this, it becomes fixed. Before the internal pressure of the surface body 1 reaches the C pressure higher than the control reference pressure, the air volume of the electric fan unit 3 is gradually reduced to S%. Below this, it becomes fixed. , The aforementioned BH pressure is the control reference pressure minus 0.2~0.8hPa pressure, the BL pressure is the control reference pressure plus 0.2~0.8hPa pressure, M% is 3~30%, A pressure is the control reference pressure reduction To the pressure of 0.7~1.3hPa, L% is 80~100%, C pressure is the control reference pressure plus 0.7~1.3hPa pressure, S% is 1~3%.

In the breathing protector of the present invention, the internal pressure of the face body 1 is set to a value obtained by subtracting the suction pressure from the exhaust pressure plus the control reference pressure. The control reference pressure is set to a certain interval to shift the range. Take the average of every α second period.

In the breathing protector of the present invention, the α second period is 2 to 10 seconds.

The respiratory protective device of the present invention is constructed as described above, Therefore, even for the irregular breathing of the wearer, the internal pressure of the face body can be detected immediately, which can become a comfortable breathing without suffocation, and the structure is simple and the operation is easy.

In addition, the breathing protector of the present invention can steplessly control the air volume of the electric fan unit through the air pressure sensor arranged in the face body, and restrain the excess of the electric fan by cooperating with the control of the wearer's breathing Action can extend battery life and suppress filter consumption.

1: face

2: Wearing belt

3: Electric fan unit

4: filter device

5: suction valve

6: Exhaust valve

7: Air pressure sensor

7a: Inspection Department

13: battery unit

Fig. 1 is a perspective view showing the state of the breathing protector of the present invention viewed from the front.

Fig. 2 is an exploded perspective view of the breathing protector (with the wearing belt omitted) of the present invention shown in Fig. 1.

Fig. 3 is a perspective view showing the state of the breathing protector (with the wearing belt omitted) of the present invention shown in Fig. 1 viewed from the rear.

Fig. 4 is a cross-sectional view of the respiratory protective device of the present invention shown in A-A in Fig. 3.

Fig. 5 is an explanatory diagram showing the control state of the air volume of the electric fan unit of the breathing protector of the present invention.

Fig. 6 is an explanatory diagram showing a state in which the internal pressure of the face body of the breathing protector of the present invention follows the change in atmospheric pressure.

Hereinafter, the form of the respiratory protective device for implementing the present invention will be described in detail based on the drawings.

The breathing protector of the present invention, as shown in the figure, is composed of: a face covering at least the nose and mouth of the wearer 1, a wearing belt extending from the wearer’s head to the neck 2, and an electric fan unit 3 The filter device 4 is composed of wearing belts 2 on both sides of the face body 1, and an electric fan unit 3 and a filter device 4 are respectively arranged on the vertical center line of the face body 1.

The surface body 1 is a hollow body made of synthetic resin, etc., in the shape of an oblique elliptical cone or an oblique polygonal pyramid. The suction valve 5 is installed in the center, and the exhaust valve 6 is installed in the upper center. The air pressure sensor 7 is installed on the inner wall surface. And, above the exhaust valve 6 of the face body 1, a shield 8 is installed through the ventilation space S. In addition, a buffer material 9 is installed on the periphery of the face body 1. In addition, the valve structure of the intake valve 5 and the exhaust valve 6 is not particularly limited. In addition, although the face body 1 shown in the figure is a half face that covers the mouth and nose of the wearer, it may also be a full face that covers the entire face of the wearer.

The wearing belt 2 is made of the following members: a headband 2a made of a ring-shaped soft synthetic resin, etc., and a surface made of stretchable rubber that hangs linearly from both sides of the headband 2a. The body strap 2b, and the neck strap 2c further extended from the face strap 2b. In addition, at the front end of the neck strap 2c, a buckle B for catching the wearer's neck is installed.

The electric fan unit 3 is composed of a fan cover 10 and a motor fan unit 11, and is housed in a storage chamber C provided in the center of the front part of the face body 1, and is supplied with electric power from the battery unit 13 through the fan wire 12. In addition, the battery cell 13 shown in the figure is individually provided outside the surface body 1, but it is also Can be assembled in face body 1. In this way, the respiratory protector is made more compact, and it is convenient to operate or carry.

The filter device 4 is composed of the following components: a cassette-type filter 14 for dust or gas protection, a filter packing 16 for hermetically holding the filter 14 in the holding portion 15 in front of the surface body 1, The splash prevention filter 17 and the holding cover 18 are also provided. The holding mask 18 is provided with a vent hole 19 in the center, and a splash preventive filter 17 is inserted into the vent hole 19 to press the filter 14 held in the holding portion 15 to the filter packing 16, and plug it It is detachably installed in the form of the outer wall of the holding portion 15.

The air pressure sensor 7 is a piezoresistive pressure sensor. The electric power from the battery cell 13 is supplied through the sensor wire 20, and is provided by an electronic circuit (not shown) incorporated in the battery cell 13 control. The detection portion 7a of the air pressure sensor 7 is arranged at a position above the inner wall surface of the side portion of the face body 1, especially installed near the exhaust valve 6. In this way, the detection sensitivity of the air pressure sensor 7 is hardly affected by the wearer's sweat or high-humidity working environment. In addition, the electronic circuit that controls the air pressure sensor 7 is also assembled in the surface body 1 in the same way as the battery unit 13 described above, thereby making the breathing protector more compact and convenient for handling and carrying.

The above-mentioned general air pressure sensor 7 directly detects the internal pressure of the face body 1 in the wearing state, and is controlled by the aforementioned electronic circuit, even for the wearer's irregular breathing. In addition, the air pressure sensor 7 controls the air volume of the electric fan unit 3 steplessly, and cooperates with the breath of the wearer to restrain the excessive rotation of the electric fan to extend the battery life, which can be used for a long time.

In addition, the air pressure sensor 7 detects the internal pressure of the surface body 1 at any time. Moreover, the detection information of the internal pressure of the face body 1 is averaged and used as the control reference pressure, whereby the air volume of the electric fan unit 3 can be steplessly controlled by the internal pressure of the face body 1.

The control of the air volume of the electric fan unit 3 is as shown in Fig. 5. When the atmospheric pressure before wearing the protective gear is, for example, 1008.8hPa, the control reference pressure is set to 1008.3hPa (BH pressure) to 1009.3hPa (BL pressure) range. Furthermore, taking the air volume of the electric fan unit 3 at this time as, for example, 5% (M%) of the full force, the internal pressure of the face body 1 reaches 1007.8hPa (pressure A) which is lower than the control reference pressure by the wearer’s breathing. ), the air volume of the electric fan unit 3 is gradually increased to, for example, 90% (L%), and above this is fixed, and the internal pressure of the surface body 1 reaches 1009.4hPa (C pressure) which is higher than the control reference pressure ) Until now, the air volume of the electric fan unit 3 is gradually reduced to, for example, 1% (S%), and below this is fixed.

The aforementioned BH pressure, BL pressure, M%, A pressure, L%, C pressure, and S% can be set to any value according to the working content or working environment of the operator who uses the protective gear, but no matter what In order to ensure comfortable breathing without suffocation, the BH pressure is better to subtract 0.2~0.8hPa from the control reference pressure, the BL pressure is to add 0.2~0.8hPa to the control reference pressure, and M% is better. 3~30% is better, A pressure is better to subtract 0.7~1.3hPa from control reference pressure, L% is better to 80~100%, C pressure is to control reference pressure plus 0.7~1.3hPa pressure Preferably, S% is preferably 1~3%.

In addition, the internal pressure of the face body 1 is determined by the pressure sensor 7 The actual measured value is analyzed and processed to follow the changing atmospheric pressure at any time and serve as the control reference pressure.

The internal pressure, exhaust pressure, suction pressure, and atmospheric pressure of the face body 1 act. Although the atmospheric pressure fluctuates, the sum of the inspiratory volume and the exhaust volume of breathing is almost the same. Therefore, in the present invention, the moving average method is used to average the fluctuation of the atmospheric pressure and control it as the control reference pressure. In addition, the so-called moving average method is a type of numerical forecasting method. It is a statistical method for calculating the predicted value of change that eliminates the influence of fluctuation by setting a certain interval and averaging while staggering the range.

The atmospheric pressure, which becomes the air volume control of the electric fan unit 3, changes over time with time beyond the aforementioned control area. However, in order to control the air volume of the electric fan unit 3 by detecting the internal pressure of the face body 1 that changes by breathing, it is necessary to grasp the atmospheric pressure that changes with time at all times. However, the addition of the atmospheric pressure sensor 7 for atmospheric pressure detection will cause Increase in cost or size.

Therefore, in the breathing protector of the present invention, the detection data of the air pressure sensor 7 installed on the inner wall surface of the face body 1 is used to reliably control the air volume of the electric fan unit 3 and eliminate the suffocation during use.

That is, the internal pressure of the face body 1 is set to a value obtained by subtracting the suction pressure from the exhaust pressure plus the control reference pressure. The control reference pressure is set to a certain interval to shift the range, for example, after wearing a protective device The average value of every α second period is used to calculate the predicted value of change that excludes the influence of atmospheric pressure changes, and the control reference value can be updated at any time. In this way, the internal pressure of the face body 1 is as shown in FIG. 6 and can follow the atmospheric pressure change. Again, this situation At this time, the aforementioned α second period is preferably a period of 2 to 10 seconds. In the α second period, if the period is less than 2 seconds, the measurement time will be short and the wave value of the respiratory component will remain, and the control reference value cannot be smoothed, so it is not good. If the period exceeds 10 seconds, it can be an accurate atmospheric pressure prediction, but A long measurement time will make the action reactivity worse, and give the wearer a feeling of suffocation, which is not good.

Moreover, in the breathing protector of the present invention, the air pressure sensor 7 may be of waterproof design. In the case of a waterproof design, it is installed on the inner wall surface of the face body 1, and in addition to the inner wall surface of the face body 1, it may be It is mounted on the outer wall surface or the battery cell 13, for example. By making the air pressure sensor 7 a waterproof design, the air pressure sensor 7 installed on the inner wall of the face body 1 can be used even in an extremely high humidity environment in the face body 1, and the inner wall of the face body 1 It is also possible to wash with water, and the air pressure sensor 7 installed on the outer wall of the surface body 1 will not be affected when it rains. Therefore, it can also be used in sports fields such as running and cycling in sweaty environments, or as a respiratory protection device for traveling on motorcycles and mountaineering. Moreover, when the air pressure sensor 7 is installed on the inner and outer walls of the face body 1, the inner pressure and the atmospheric pressure of the face body 1 are always detected, and the air volume of the electric fan unit 3 can be controlled by measuring the differential pressure.

In addition, in the breathing protector of the present invention, the control of the air volume of the electric fan unit 3 adopts PWM control, whereby when the residual battery capacity is reduced or the filter is clogged, the frequency of the PWM control is set to the audio range , The vibrating sound of the motor can inform the wearer that the remaining battery is reduced or the filter is clogged. In addition, control is performed so that the air volume M% of the electric fan unit 3 is set to the BH pressure ~ BL pressure in the above-mentioned control reference pressure. At this time, it becomes 5% with one switching action, and 20% with two consecutive switching actions.

The breathing protector of the present invention constructed as described above can instantly detect the internal pressure of the face body 1 even for the wearer's irregular breathing, and can provide comfortable breathing without any obstruction, and has a simple structure and easy operation.

In addition, the breathing protector of the present invention can steplessly control the air volume of the electric fan unit 3 through the air pressure sensor 7 provided in the face body 1, and restrain electric power by cooperating with the control of the wearer's breathing. The excessive operation of the fan can extend the battery life and suppress the consumption of the filter.

1‧‧‧Hedron

2‧‧‧Wearing belt

2a‧‧‧Headband

2b‧‧‧Hedron lanyard

2c‧‧‧Neck strap

4‧‧‧Filter device

8‧‧‧Mask

9‧‧‧Buffer material

12‧‧‧Wire

17‧‧‧Filter

18‧‧‧Keep the mask

20‧‧‧Wire

B‧‧‧buckle

Claims (3)

A breathing protector, characterized in that it is composed of a face body (1) covering at least the nose and mouth of a wearer, a wearing belt (2), and a filter device (4) equipped with an electric fan unit (3), The face body (1) is provided with an intake valve (5) and an exhaust valve (6), and an air pressure sensor (7) is installed on the inner wall surface. The aforementioned air pressure sensor (7) is always The internal pressure of the surface body (1) is detected, the detection information of the internal pressure of the surface body (1) is averaged, and this is used as the control reference pressure, so that the internal pressure of the surface body (1) can be stepless Control the air volume of the electric fan unit (3). The air volume control of the aforementioned electric fan unit (3) is to set the control reference pressure in the range of (BH) pressure to (BL) pressure, and set the electric fan unit (3) at this time The air volume is regarded as the full force (M)%. Before the internal pressure of the face body (1) reaches the pressure (A) lower than the control reference pressure by the wearer’s breathing, the electric fan unit (3) The air volume is increased to (L)%, and above this, it becomes fixed. The air volume of the electric fan unit (3) is gradually reduced until the internal pressure of the surface body (1) reaches the pressure (C) higher than the control reference pressure. Decrease to (S)%, below which it becomes fixed, the aforementioned (BH) pressure is the pressure of 0.2~0.8hPa subtracted from the control reference pressure, and the (BL) pressure is the control reference pressure plus 0.2~0.8hPa Pressure, (M)% is 3~30%, (A) pressure is the pressure minus 0.7~1.3hPa from the control reference pressure, (L)% is 80~100%, (C) pressure is the control reference pressure plus For the pressure of 0.7~1.3hPa, (S)% is 1~3%. The respiratory protective device according to claim 1, wherein the internal pressure of the surface body (1) is set to the value obtained by subtracting the suction pressure from the exhaust pressure plus the control reference pressure, and the control reference pressure is set A certain interval to stagger the range, and take the average of every (α) second period. The respiratory protective device according to claim 2, wherein the (α) second period is 2 to 10 seconds.

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