JP2010012280A - Mask device with blower - Google Patents

Abstract

A mask device with a blower free from a failure is provided.
SOLUTION: An exhaust valve 7 that moves in the opening direction at the time of exhaust while moving in a closing direction at the time of intake and an intake valve that moves in a direction of closing at the time of exhaust and moves in the direction of opening at the time of intake are provided at the front portion of the face body 2 8, and is driven by a motor 11. In the mask device 1 with a blower provided with a blower 10 that sends outside air into the face body through the intake valve during operation thereof, the exhaust valve is made of a material mixed with a magnetic substance. Constitute.
[Selection] Figure 1

Description

  TECHNICAL FIELD The present invention relates to a mask device with a blower suitable for a full-face mask, a half-face mask, etc. used for the purpose of dust prevention and poison prevention.

  In the conventional mask device with a blower, a blower is attached to the front side or the rear side of the filter medium on the ventilation passage, and the breathing power is used to assist breathing. The mask device with a blower is a type that flows air in a steady flow regardless of the wearer's breathing (called a constant flow type blower) and a type that sends air following the wearer's breathing (called a breath following type blower). Divided into

  As a breath following type blower, Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, and the like disclose ones that detect the in-plane pressure. Patent Document 5 discloses a device that uses a photo interrupter that detects the position of an exhaust valve or an intake valve.

JP-A-10-28744 JP 60-68869 A Japanese Utility Model Publication No. 61-118618 Japanese Utility Model Publication No. 60-49851 Japanese Patent No. 3726886

  In the conventional techniques for detecting the in-plane pressure disclosed in Patent Document 1 to Patent Document 4 described above, the in-plane pressure is detected by using a material that easily responds to pressure such as a diaphragm. In order to be able to detect the internal pressure even with a positive pressure of about several Pascals, it is necessary to sharpen the corresponding pressure response.Since such a diaphragm is very fragile and easily deforms or breaks, failure or misalignment occurs. There are problems such as easy.

  An object of the present invention is to provide a new mask device with a blower that does not have the above-mentioned problems.

  According to the present invention, an exhaust valve that moves in the opening direction during exhaust while moving in the closing direction during intake and an intake valve that moves in the closing direction during exhaust and moves in the opening direction during intake are provided at the front of the face piece. In the mask device with a blower provided with a blower that is provided and driven by a motor and sends outside air into the face body through the intake valve during operation thereof, the exhaust valve is made of a material mixed with a magnetic material. This is a mask device with a blower.

  ADVANTAGE OF THE INVENTION According to this invention, since the intensity | strength of a magnetism can be detected in a non-contact state, the mask apparatus with a blower which is hard to fail can be provided.

It is sectional drawing of a mask apparatus with a blower. It is sectional drawing of the vicinity part of the exhaust valve in a mask apparatus with a blower (when a wearer is an exhaust state). It is sectional drawing of the vicinity part of the exhaust valve in a mask apparatus with a blower (at the time of the initial stage of intake when a wearer changes from exhaust_gas | exhaustion). It is sectional drawing of the vicinity part of the exhaust valve in a mask apparatus with a blower (when a wearer is in an intake state and a blower ventilation volume does not satisfy the wearer's intake volume). It is a circuit diagram which shows a part of control circuit in a mask apparatus with a blower. It is sectional drawing of the vicinity part of the exhaust valve which shows another example of arrangement | positioning of the position detection sensor for a blower control in a mask apparatus with a blower, and an alarm. It is a circuit diagram which shows a part of control circuit in a mask apparatus with a blower (when making a blower and an alarm device control separately by the signal of one position detection sensor). It is sectional drawing of the vicinity part of the exhaust valve in a mask apparatus with a blower (when a wearer is an exhaust state). It is sectional drawing of the vicinity part of the exhaust valve in a mask apparatus with a blower (when a wearer is an exhaust state). It is a circuit diagram which shows a part of control circuit in a mask apparatus with a blower (when making a blower and an alarm device control separately by the signal of one MR sensor).

  The blower-equipped mask device of the present invention moves to the front part of the face plate in the opening direction during exhaust, while moving in the closing direction during intake, and in the closing direction during exhaust, while moving in the opening direction during intake In the mask device with a blower, which is provided with an air intake valve that is driven by a motor and that feeds outside air into the face body through the intake valve during operation thereof, the exhaust valve is made of a material mixed with a magnetic material It is characterized by that.

The exhaust valve can be made by mixing a magnetic material with a valve material such as silicone rubber and molding it.
Further, in the mask device with a blower of the present invention, at the time of inhalation, the movement position of the exhaust valve corresponding to the decrease in the internal pressure of the face body relative to the external air pressure is detected in a non-contact state with respect to the exhaust valve, and a signal is output. It is preferable that an alarm sensor is provided and the alarm device is activated by a signal from the alarm sensor. By doing so, when the air supply amount of the blower decreases due to dust clogging of the filtering material or a decrease in battery voltage, the wearer can easily recognize the decrease in the pressure in the face due to the operation of the alarm device. Therefore, the wearer can continue to prevent invasion of harmful substances by exchanging the filter and the battery. Further, since a diaphragm that is very fragile and easily breaks or deforms is not used, it is difficult to break down, and there is no fear that the set value that becomes the moving position of the valve for determining the operation of the alarm device is shifted. In that case, it is preferable that each of the blower control sensor and the alarm sensor is composed of a magnetoresistive element.

  Hereinafter, description will be given with reference to the drawings. FIG. 1 is a sectional view showing a mask device with a blower of the present invention. As shown in FIG. 1, a mask device with a blower 1 has an exhaust port 4 whose outer surface is covered with an exhaust valve cover 3 and an intake port 6 whose outer surface is also covered with a filter material cover 5 at the front portion of a face piece 2. And. Further, the exhaust port 4 is provided with an exhaust valve 7 that moves in the direction of opening during exhaustion while moving in accordance with the wearer's breathing, while moving in the direction of closing during intake, and the intake port 6 moves in the direction of closing during exhaustion. On the other hand, an intake valve 8 that moves in a direction to open during intake is provided. Inside the filter medium cover 5, a filter medium 9 (so-called filter) is disposed outside the intake valve 8 and at the tip of the filter medium cover 5, and between the filter medium 9 and the intake port 6. A blower 10 is provided. The blower 10 includes a driving motor 11 and an impeller 12 connected to an output shaft thereof. When the motor 11 is normally operating, the blower 10 sends outside air into the face body 2 through the filter medium 9 and the intake valve 8. It has become.

First, the present invention will be described based on FIG. 9 and FIG.
FIG. 9 is a cross-sectional view of the vicinity of the exhaust valve in the mask device with a blower of the present invention (when the wearer is in the exhaust state). In the present invention, it is only necessary to know the position (shape) of the exhaust valve 7 in a non-contact manner. As shown in FIG. 9, the exhaust valve 30 to be detected is formed of a material mixed with a magnetic material (silicon rubber). To do. Each of the blower control sensor 28 and the alarm sensor 29 is a magnetoresistive element (hereinafter referred to as an MR sensor) that increases the resistance value in accordance with the detected magnetic strength, instead of a photo interrupter. It is preferable to configure. Even if it comprises in this way and grasps | ascertains the position (shape) of a valve with MR sensor, the same effect can be acquired.

  FIG. 10 is a circuit diagram showing a part of the control circuit (when the blower and the alarm device are individually controlled by a signal of one MR sensor). In the fourth embodiment, only one MR sensor is provided for the movement position of the exhaust valve 30 (MR sensor 28), and the control of the blower 10 and the alarm device (alarm LED 20) are individually performed in the control circuit. I try to make it.

  As shown in FIG. 10, one end of the MR sensor 28 is directly connected to the power supply, the other end of the MR sensor 28 is connected to one end of the resistor r4, and the other end of the resistor r4 is connected to the ground (ground). The signal line is bifurcated with respect to the connection point 22 between the other end of the MR sensor 28 and the resistor r4, and one of the branched signal lines 27a is connected to the + input terminal of the first comparator 23, and the first comparator A first reference output (VREF1) 24 for outputting a certain level signal is connected to the negative input terminal 23. The other branched signal line 27 b is connected to the + input terminal of the second comparator 25, and a second reference output (VREF 2) 26 that outputs a certain level signal to the − input terminal of the second comparator 25. Is connected.

  The first reference output 24 is the same as the potential at the connection point 22 related to the voltage drop due to the resistance value of the MR sensor 28 when the exhaust valve 7 is located at the boundary line d1 in FIG. The second reference output 26 is the same as the potential at the connection point 22 related to the voltage drop due to the resistance value of the MR sensor 28 when the exhaust valve 7 is located at the boundary line d2 in FIG. Or a value slightly smaller than the potential of the connection point 22. Since other circuit configurations are the same as those in FIG. 7 described later, the same parts are denoted by the same reference numerals, and detailed description thereof is omitted here.

  The above operation will be described. When the exhaust valve 30 is in the position shown in FIG. 9 (the exhaust state of the wearer), the exhaust valve 30 mixed with the magnetic material is positioned closest to the MR sensor 28, and thus the detected magnetic strength is increased. Following this, the resistance value of the MR sensor 28 that increases the resistance value is the largest. For this reason, the current flowing toward the ground through the MR sensor 28 and the resistor r4 has a minimum value, and the potential at the connection point 22 (the voltage drop due to the resistor r4) viewed from the ground level (0 V) is the lowest potential. The input voltage at the + input terminal of the first comparator 23 having the same potential as 22 does not exceed the first reference output 24 to be compared. Similarly, the input voltage of the + input terminal of the second comparator 25 having the same potential as the connection point 22 does not exceed the second reference output 26 to be compared.

  Therefore, the outputs of the first comparator 23 and the second comparator 25 are also turned off, the second transistor 19 is turned off, the first transistor 18 is turned off because the second transistor 19 is turned off, and the third transistor 21 is turned on. The motor 11 is stopped (ie, the blower 10 stops air supply) and the alarm LED 20 is turned off.

  Next, when the wearer's breathing turns into inspiration and the exhaust valve 30 moves toward the exhaust valve seat 13 accordingly, the magnetism detected by the MR sensor 28 is weakened as the exhaust valve 30 moves (the magnetic flux density is reduced). The resistance value of the MR sensor 28 changes so as to decrease. For this reason, the current flowing toward the ground through the MR sensor 28 and the resistor r4 increases from the minimum value, and the potential of the connection point 22 (a voltage drop due to the resistor r4) viewed from the ground level (0 V) is the highest. It rises from a low potential (the potential changes in the higher direction).

  When the exhaust valve 30 exceeds the position indicated by the boundary line d1 in FIG. 9 and the exhaust valve 30 moves a little toward the exhaust valve seat 13 by intake air, the potential of the connection point 22 due to the resistance value of the MR sensor 28 at this time is First, the input voltage at the + input terminal of the first comparator 23 having the same potential as the connection point 22 exceeds the first reference output 24 to be compared.

  Therefore, the output of the first comparator 23 is turned on, the second transistor 19 is turned on, the first transistor 18 is turned on when the second transistor 19 is turned on, the power is supplied to the motor 11, and the blower 10 is operated. Then air is sent. On the other hand, in the second comparator 25, the voltage at the + input terminal, which is the same potential as the connection point 22, has not reached the second reference output 26 to be compared, and the output of the second comparator 25 remains off. The third transistor 21 is turned off and the alarm LED 20 is turned off.

  When there is no clogging of the filter or a drop in the power supply voltage, before the exhaust valve 7 reaches the boundary line d2, the air supply amount of the blower 10 exceeds the wearer's intake air amount, and the intracorporeal pressure maintains a positive pressure. Moreover, since excess blower air (reference numeral 17 in FIG. 3) flows out from the exhaust port 4 of the exhaust valve seat 13, the exhaust valve 30 is slightly lifted from the exhaust valve seat 13, and the exhaust valve 30 is set to the set boundary line. The position of d2 is not reached.

  Therefore, in the MR sensor 28, the resistance value maintains a value that turns on the output of the first comparator 23 and simultaneously turns off the output of the second comparator 25. Therefore, the third transistor 21 remains off, power is not supplied to the alarm LED 20, and the alarm device does not operate (the alarm LED 20 is turned off).

  On the other hand, if the filter is clogged or the power supply voltage is lowered, the air supply amount of the blower 10 becomes less than the wearer's intake air amount, so that the pressure in the face is negative (the internal pressure of the face 2 is lower than the external pressure). 4 and the exhaust air that pushes up the exhaust valve 30 disappears, so that the exhaust valve 30 returns to be airtight with the exhaust valve seat 13 as shown in FIG. Accordingly, the exhaust valve 30 exceeds the boundary line d2 set in the MR sensor 28.

  Therefore, since the exhaust valve 30 mixed with a magnetic material is located farthest from the MR sensor 28, the magnetism detected by the MR sensor 28 is minimized, and the resistance value of the MR sensor 28 is minimized. For this reason, the current flowing toward the ground through the MR sensor 28 and the resistor r4 has a maximum value, and the potential at the connection point 22 (the voltage drop due to the resistor r4) viewed from the ground level (0 V) is the highest potential. The voltage at the + input terminal of the second comparator 25 having the same potential as 22 exceeds the second reference output 26 to be compared. Accordingly, the output of the second comparator 25 is turned on, the third transistor 21 is turned on, the alarm LED 20 is lit, and the wearer is notified that the intracorporeal pressure is negative. As described above, even if there is one MR sensor, the same effect can be obtained.

Next, a description will be given based on FIGS.
In the description of these drawings, an example in which the reflection type photo interrupter is a position detection sensor will be described.

  2 to 4 are cross-sectional views of the vicinity of the exhaust valve 7 in the mask device 1 with a blower. 2 shows the exhaust valve 7 when the wearer is in the exhaust state, and FIG. 3 shows the exhaust valve 7 in the initial intake state when the wearer changes from exhaust to intake. FIG. 4 shows the exhaust valve 7 when the wearer is in the intake state when the blower air flow rate does not satisfy the wearer's intake amount. As shown in FIGS. 2 to 4, an exhaust valve seat 13 is mounted around the exhaust port 4 of the face piece 2, and the exhaust valve 7 is attached to the exhaust valve seat 13.

  The blower-equipped mask device 1 according to the first aspect uses two sensors for blower control and alarm. A position detection sensor 14 and a position detection sensor 15 for detecting the movement position of the exhaust valve 7 are disposed outside the vicinity of the exhaust valve 7. The position detection sensors 14 and 15 have the same configuration, and the position detection sensor 14 will be described as an example. A reflection type photo sensor including a light emitting element (light emitting diode) 14a and a light receiving element (transistor receiver) 14b as one set. When the light receiving element 14b detects infrared rays output from the light emitting element 14a, a signal is output. The position detection sensor (reflection photo interrupter) 14 is disposed with the light emitting surface of the light emitting element 14a and the light receiving surface of the light receiving element 14b facing the exhaust valve 7, respectively. Similarly, the position detection sensor (reflection photo interrupter) 15 is disposed with the light emitting surface of the light emitting element 15a and the light receiving surface of the light receiving element 15b facing the exhaust valve 7, respectively.

  The position detection sensor 14 is for blower control for following the breath, and the position detection sensor 15 is for alarm for operating the alarm device. 2 to 4 is a distance boundary line from which the position detection sensor 14 outputs a signal, and reference numeral d2 is a distance boundary line from which the position detection sensor 15 outputs a signal. Each position detection sensor 14, 15 is an infrared ray output from the light emitting element when the detection target (exhaust valve 7) moves in a direction closer to each boundary line (in a direction away from the exhaust valve seat 13). Is reflected by the exhaust valve 7 and received by the light receiving element, and the light receiving element is turned on.

  2 to 4, the position where the alarm position detection sensor 15 outputs a signal is closer to the exhaust valve seat 13 than the position where the blower control position detection sensor 14 outputs a signal. The position is set. An arrow chain line indicated by reference numeral 16 in FIG. 2 indicates the exhaust air trajectory of the wearer during exhaust. Moreover, the arrow chain line shown with the code | symbol 17 in FIG. 3 has shown the air trajectory of the ventilation by the excess blower 10 which exceeded the wearer's intake air amount.

  FIG. 5 is a circuit diagram showing a part of the control circuit in the mask device with blower 1 of the first preferred embodiment. As shown in FIG. 5, the first transistor (PNP type) 18 that controls power supply to the motor 11 that drives the blower 10 has an emitter connected to the power source and a collector connected to the motor 11. The base of the first transistor 18 is connected to the collector of a second transistor (NPN type) 19 that controls the operation of the first transistor 18. The emitter of the second transistor 19 is connected to the ground (ground), the base of the second transistor 19 is connected to the power supply via the resistor r1, and is connected to one end of the light receiving element 14b of the position detection sensor 14, The other end of the light receiving element 14b of the detection sensor 14 is connected to the ground (ground).

  Moreover, LED (alarm LED20) is used as one aspect | mode of an alarm device. One end of the alarm LED 20 is connected to a power source through a resistor, and the other end of the alarm LED 20 is connected to the collector of a third transistor (NPN type) 21 that controls the on / off operation of the alarm LED 20. The emitter of the third transistor 21 is connected to the ground, and the base of the third transistor 21 is connected to the power supply via the resistor r2, and is connected to one end of the light receiving element 15b of the position detection sensor 15, and the position detection sensor 15 is connected. The other end of the light receiving element 15b is connected to the ground.

  Next, the operation of the blower-equipped mask device 1 according to the first preferred embodiment will be described. At the time of exhaust, as shown in FIG. 2, the exhaust valve 7 is pushed up from the exhaust valve seat 13 toward the position detection sensors 14 and 15 by the exhaust of the wearer. That is, the in-plane pressure is a positive pressure (a pressure larger than the external atmospheric pressure), and the exhaust valve 7 is located closer to the position detection sensors 14 and 15 than both the boundary lines d1 and d2. For this reason, in the position detection sensor 14, the infrared light output from the light emitting element 14a and reflected by the exhaust valve 7 is received by the light receiving element 14b, so that the light receiving element 14b is turned on (outputs a signal). . Also in the position detection sensor 15, the infrared light output from the light emitting element 15 a and reflected by the exhaust valve 7 is received by the light receiving element 15 b, so that the light receiving element 15 b is turned on (outputs a signal).

  In FIG. 5, since the light receiving element 14 b of the position detection sensor 14 is on, the voltage applied to the base of the second transistor 19 is almost at the ground level, so that the second transistor 19 is turned off, Because the two transistors 19 are off, the first transistor 18 is also off. Therefore, no power is supplied to the motor 11, and the blower 10 stops blowing. Further, since the light receiving element 15b of the position detection sensor 15 is turned on, the voltage applied to the base of the third transistor 21 is almost at the ground level, and therefore the third transistor 21 is turned off. Therefore, power is not supplied to the alarm LED 20, and the alarm LED 20 is turned off.

  When changing from exhaust to intake, as shown in FIG. 3, the exhaust valve 7 moves in the direction of returning toward the exhaust valve seat 13 because there is no pressure to push up the valve due to exhaustion of the wearer. In this case, first, the exhaust valve 7 exceeds the boundary line d 1 set in the position detection sensor 14. Then, the infrared rays irradiated from the light emitting element 14a of the position detection sensor 14 and reflected by the exhaust valve 7 deviate from the light receiving surface of the light receiving element 14b, and no signal is output (the light receiving element 14b turns off).

  In FIG. 5, since the base current flows through the resistor r1 to the base of the second transistor 19 by turning off the light receiving element 14b of the position detection sensor 14, the second transistor 19 is turned on and the second transistor 19 is turned on. Is turned on, a base current flows from the emitter of the first transistor 18 toward the base, and the first transistor 18 is also turned on. Therefore, power is supplied to the motor 11 through the first transistor 18 and the blower 10 is activated. That is, when the signal output from the position detection sensor 14 turns off (by the position detection signal of d1), the blower 10 operates.

  When the filter (filter material 9) is not clogged or the power supply voltage is not lowered, the air supply amount of the blower 10 is increased by the wearer's intake air before the exhaust valve 7 reaches the boundary line d2 set in the position detection sensor 15. 3 and the pressure inside the face maintains a positive pressure, and excess blower air (reference numeral 17 in FIG. 3) flows out from the exhaust port 4 of the exhaust valve seat 13, so that the exhaust valve 7 exhausts as shown in FIG. The exhaust valve 7 does not reach the position of the boundary line d 2 set in the position detection sensor 15. Therefore, in the position detection sensor 15, the infrared light output from the light emitting element 15a and reflected by the exhaust valve 7 is received by the light receiving element 15b, so that the light receiving element 15b remains on (outputs a signal). To do). Therefore, since the light receiving element 15b of the position detection sensor 15 is kept on, the third transistor 21 remains off, power is not supplied to the alarm LED 20, and the alarm device does not operate (the alarm LED 20 is turned off). is doing).

  On the other hand, if the filter changes from exhaust to intake and the filter is clogged or the power supply voltage drops, the blower 10 will not be able to supply the intake air to the wearer. 4 and the exhaust valve 7 returns to be airtight with the exhaust valve seat 13, as shown in FIG. Therefore, since the exhaust valve 7 crosses the boundary line d2 set in the position detection sensor 15, the infrared ray irradiated from the light emitting element 15a of the position detection sensor 15 and reflected by the exhaust valve 7 passes through the light receiving surface of the light receiving element 15b. As a result, no signal is output (the light receiving element 15b turns off).

  In FIG. 5, since the base current flows to the base of the third transistor 21 via the resistor r2 when the light receiving element 15b of the position detection sensor 15 is turned off, the third transistor 21 is turned on and the third transistor 21 is turned on. Is turned on, power is supplied to the alarm LED 20 and the alarm LED 20 is lit. Therefore, when the signal output from the position detection sensor 15 turns off (due to the position detection signal of d2), the alarm LED 20 notifies the wearer that the in-body pressure is negative by lighting. .

  In the first aspect described above, the position detection sensor 14 and the position detection sensor 15 are disposed in front of the movement direction of the exhaust valve 7 (in a direction that opens away from the exhaust valve seat 13). 14 and the position detection sensor 15 are not limited to the front in the movement direction of the exhaust valve 7, but, for example, in the movement direction of the exhaust valve 7 so as to sense the side end face of the exhaust valve 7, as shown in FIG. On the other hand, you may arrange | position to the side. In addition, the position detection sensor 14 and the position detection sensor 15 can be expected not only to be a photo interrupter but also to a non-contact sensor that can detect the position of the exhaust valve 7 in a non-contact manner.

  Next, a 2nd aspect is demonstrated. In the first embodiment described above, the position detection sensor 14 for blower control for following the breathing with respect to the movement position of the exhaust valve 7, and the position detection sensor 14 for alarm for operating the alarm device, However, in the second embodiment, only one position detection sensor is provided for the movement position of the exhaust valve 7, and the control of the blower 10 and the alarm device ( The alarm LED 20) is controlled.

  FIG. 7 is a circuit diagram showing a part of the control circuit when the blower 10 and the alarm device are individually controlled in the second mode. As in the first embodiment, an LED (alarm LED 20) is used as an alarm device, and a position detection sensor 14 (configured by a photo interrupter) that detects the movement position of the exhaust valve 7 is disposed outside the vicinity of the exhaust valve 7. ing. As shown in FIG. 7, one end of the light receiving element 14b of the position detection sensor 14 is connected to a power source through a resistor r3, and the other end of the light receiving element 14b of the position detection sensor 14 is connected to the ground.

  One end of the resistor r4 is connected to a connection point 22 between one end of the light receiving element 14b of the position detection sensor 14 and the resistor r3, and the other end of the resistor r4 is connected to the ground (ground). Further, the signal line of the light receiving element 14b of the position detection sensor 14 from the connection point 22 is bifurcated, and one of the branched signal lines 27a is connected to the + input terminal of the first comparator 23, and the first comparator 23 The first reference output (VREF1) 24 for outputting a certain level signal is connected to the negative input terminal. The output terminal of the first comparator 23 is connected to the base of a second transistor (NPN type) 19 that controls the operation of the first transistor 18.

  The other branched signal line 27 b is connected to the + input terminal of the second comparator 25, and a second reference output (VREF 2) 26 that outputs a certain level signal to the − input terminal of the second comparator 25. Is connected. The output terminal of the second comparator 25 is connected to the base of the third transistor 21 (NPN type). The first comparator 23 outputs a signal when the output of the light receiving element 14b of the position detection sensor 14 exceeds the first reference output 24 to be compared. The second comparator 25 outputs a signal when the output of the light receiving element 14b of the position detection sensor 14 exceeds the second reference output 26 to be compared.

  FIG. 8 is a cross-sectional view of the vicinity of the exhaust valve 7 in the mask device 1 with a blower of the second aspect. Reference sign d1 is a boundary line (corresponding to the first movement position) of the output signal for position detection for blower control set for the position detection sensor 14, and reference sign d2 is for the position detection sensor 14. This is a boundary line (corresponding to the second movement position) of the output signal for alarm position detection set in the above. When the detection object (exhaust valve 7) moves in a direction closer to the boundary line d2 (in a direction away from the exhaust valve seat 13), the position detection sensor 14 receives infrared rays output from the light emitting element. 7 is reflected by the light receiving element and turned on.

  Further, the first reference output 24 is equal to the potential of the connection point 22 related to the output of the light receiving element 14b of the position detection sensor 14 when the exhaust valve 7 is at the position of the boundary line d1 in FIG. And the second reference output 26 is the potential of the connection point 22 related to the output of the light receiving element 14b of the position detection sensor 14 when the exhaust valve 7 is located at the position of the boundary line d2 in FIG. Or a value slightly smaller than the potential at the connection point 22.

  The operation of the second aspect will be described. When the exhaust valve 7 is in the position shown in FIG. 8 (the exhaust state of the wearer), the output of the light receiving element 14b of the position detection sensor 14 is on, and in FIG. Since the light receiving element 14b of the position detection sensor 14 is turned on, the current flowing from the power source through the resistor r3 flows to the ground through the light receiving element 14b, so that the + input of the first comparator 23 having the same potential as the connection point 22 is obtained. The input of the terminal and the + input terminal of the second comparator 25 is at the ground level. Accordingly, the outputs of the first comparator 23 and the second comparator 5 are also turned off, the second transistor 19 is turned off, the first transistor 18 is turned off by turning off the second transistor 19, and the third transistor 21 is turned on. The motor 11 is stopped (ie, the blower 10 stops air supply) and the alarm LED 20 is turned off.

  Next, the wearer's breathing turns to intake air, and the exhaust valve 7 moves toward the exhaust valve seat 13 in response to the position, and the exhaust valve 7 exceeds the position indicated by the boundary line d1 in FIG. When moving toward 13, the amount of light received by the light receiving element 14 b decreases, whereby the current signal flowing to the light receiving element 14 b through the resistor r 3 in FIG. 7 decreases, and the current flowing through the resistor r 3 flows to the ground also through the resistor r 4. It becomes like this. As a result, the potential of the connection point 22 rises from the ground level (ground) as the amount of light received by the light receiving element 14b decreases. First, the potential of the first comparator 23 having the same potential as that of the connection point 22 is increased. The voltage at the input terminal exceeds the first reference output 24 to be compared.

  Therefore, the output of the first comparator 23 is turned on, the second transistor 19 is turned on, the first transistor 18 is turned on when the second transistor 19 is turned on, the power is supplied to the motor 11, and the blower 10 is operated. Then air is sent. On the other hand, in the second comparator 25, the voltage at the + input terminal, which is the same potential as the connection point 22, has not reached the second reference output 26 to be compared, and the output of the second comparator 25 remains off. The third transistor 21 is turned off and the alarm LED 20 is turned off.

  When there is no clogging of the filter or a decrease in the power supply voltage, before the exhaust valve 7 reaches the boundary line d2 as shown in FIG. 3, the air supply amount of the blower 10 exceeds the intake amount of the wearer, Since the positive pressure is maintained and excess blower air (reference numeral 17 in FIG. 3) flows out from the exhaust port 4 of the exhaust valve seat 13, the exhaust valve 7 floats slightly from the exhaust valve seat 13 as shown in FIG. The exhaust valve 7 does not reach the position of the boundary line d2 set in the position detection sensor 14.

  Therefore, in the position detection sensor 14, the infrared light output from the light emitting element 14a and reflected by the exhaust valve 7 is still received by the light receiving element 14b, so that the light receiving element 14b is kept on (signal Output). Therefore, since the light receiving element 14b of the position detection sensor 14 is kept on, the voltage at the + input terminal, which is the same potential as the connection point 22, does not reach the second reference output 26 to be compared. Therefore, the third transistor 21 remains off, no power is supplied to the alarm LED 20, and the alarm device does not operate (the alarm LED 20 is turned off).

  On the other hand, if the filter is clogged or the power supply voltage is lowered, the air supply amount of the blower 10 becomes less than the wearer's intake air amount, so that the pressure in the face is negative (the internal pressure of the face 2 is lower than the external pressure). 4) and the exhaust valve 7 returns to be airtight with the exhaust valve seat 13, as shown in FIG. Accordingly, the exhaust valve 7 exceeds the boundary line d2 set in the position detection sensor 14. Therefore, the infrared rays irradiated from the light emitting element 14a of the position detection sensor 14 and reflected by the exhaust valve 7 deviate from the light receiving surface of the light receiving element 14b, and no signal is output (the light receiving element 14b turns off).

  In FIG. 7, when the light receiving element 14b of the position detection sensor 14 is turned off, the current flowing through the resistor r3 flows to the ground through the resistor r4. As a result, the potential at the connection point 22 is increased by the amount of current flowing through the resistor r4 as seen from the ground, and the voltage at the + input terminal of the second comparator 25 having the same potential as the connection point 22 is compared. The second reference output 26 is exceeded. Accordingly, the output of the second comparator 25 is turned on, the third transistor 21 is turned on, the alarm LED 20 is lit, and the wearer is notified that the intracorporeal pressure is negative. As described above, even if there is only one position detection sensor (photo interrupter), the same effect as in the first embodiment can be obtained.

  In the above-described embodiment, the LED is used as an example of performing alarm notification by light as the alarm device. However, the present invention is not limited to this, and the alarm device may also be an alarm device that emits sound or vibration. . It is also possible to combine at least two of light, sound and vibration.

  In the above-described aspect, power is supplied to operate the motor 11 by a signal from the position detection sensor 14 during intake, while power supply to the motor 11 is stopped during exhaust. The electric power may be supplied to the motor 11 so as to normally operate, while the electric power supply to the motor 11 may be reduced during exhaust.

DESCRIPTION OF SYMBOLS 1 Mask apparatus with a blower 2 Face body 3 Exhaust valve cover 4 Exhaust port 5 Filter material cover 6 Intake port 7 Exhaust valve 8 Intake valve 9 Filter material 10 Blower 11 Motor 12 Impeller 13 Exhaust valve seat 14 Position detection sensor (for blower control)
14a Light emitting element 14b Light receiving element 15 Position detection sensor (for alarm)
15a Light emitting element 15b Light receiving element 16 Exhaust air trajectory of the wearer 17 Excess air blower air trajectory exceeding the wearer's intake air amount 18 First transistor 19 Second transistor 20 Alarm LED (alarm device)
21 Third transistor 22 Node 23 First comparator 24 First reference output (VREF1)
25 Second comparator 26 Second reference output (VREF2)
27a signal line 27b signal line 28 MR sensor (for blower control)
29 MR sensor (for alarm)
30 Exhaust valve (mixed with magnetic material)
r1 resistance r2 resistance r3 resistance r4 resistance

Claims (4)

  At the front part of the face plate, there are provided an exhaust valve that moves in the direction to open during exhaust and moves in the direction to close during intake, and an intake valve that moves in the direction to close in exhaust and moves in the direction to open during intake In the mask device with a blower provided with a blower that is driven by the air pump and is operated to send outside air through the intake valve into the face body, the exhaust valve is made of a material mixed with a magnetic material. apparatus.   A blower control sensor that detects a movement position of the exhaust valve during intake in a non-contact state with respect to the exhaust valve and generates a signal is disposed in the vicinity of the exhaust valve. In response to the signal, power is supplied to the motor during intake to operate the blower, while power supply to the motor is stopped or reduced during exhaust, and the exhaust valve is An alarm sensor for detecting a movement position of the exhaust valve corresponding to a decrease in the internal pressure of the face body from the atmospheric pressure in a non-contact state with respect to the exhaust valve and outputting a signal is provided. An alarm device is activated by a signal from the alarm sensor, and each of the blower control sensor and the alarm sensor is a contactless sensor that monitors the state of the exhaust valve. In blower respirator apparatus according to claim 1, characterized in that it is configured.   3. The mask device with a blower according to claim 1, wherein the contactless sensor is configured by a magnetoresistive effect element that changes a resistance value in accordance with a detected magnetic strength. 4.   The blower control sensor also serves as the alarm sensor. The movement position of the exhaust valve during intake is relative to the blower control sensor based on the first movement position and the first movement position. A second movement position positioned in the closing direction is set, and the control circuit compares a signal output of the blower control sensor with a first reference output corresponding to the first movement position, and A first comparator that outputs a signal when the signal output of the blower control sensor exceeds the first reference output and supplies power to the motor; and the signal output of the blower control sensor and the second movement A second comparator that compares a second reference output corresponding to the position and outputs a signal when the signal output of the blower control sensor exceeds the second reference output to activate the alarm device. Blower respirator apparatus according to any one of claims 1 to 3, characterized in that a motor.

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