JP7369172B2 - smoke detection device - Google Patents

Description

The present invention relates to a portable smoke detection device that detects smoke particles contained in air sucked from a suction nozzle.

Highly sensitive smoke detection devices capable of detecting even the smallest amount of smoke are installed in computer rooms with servers, etc., and clean rooms in semiconductor manufacturing facilities. Highly sensitive smoke detection equipment sucks air through a sampling tube installed in the monitoring area, uses laser light to optically detect particles floating in the sucked air, and detects when the number of particles exceeds a predetermined number. Outputs a warning if the

In addition to such fixed smoke detection devices, portable smoke detection devices are also known. A portable smoke detection device is brought into a monitoring area and used, and has a suction nozzle that sucks air and a main body that detects the smoke concentration in the air sucked from the suction nozzle. The worker grasps the main body of the portable smoke detection device or fixes it to the body with a shoulder strap or the like, and moves by holding the suction nozzle in his hand. By directing the suction nozzle to various locations, the location where smoke is generated can be identified. As such a smoke detection device, there is one listed in Patent Document 1, for example.

Patent Application No. 2014-182803

Portable smoke detectors are separated into a main body and a suction nozzle, so the main body must be held in one hand or fixed to the body, and while the main body is held in one hand, the suction nozzle must be held with the other hand. The nozzle will be directed towards the detection target. Although the main body and the suction nozzle are connected by a flexible hose member or the like, in this form, it is not necessarily easy to maneuver the suction nozzle. Furthermore, it is difficult to operate the main body while pointing the suction nozzle toward the detection target.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a smoke detection device having various functions.

In order to solve the above problem, the smoke detection device according to the invention of claim 1 includes a suction nozzle having an air suction port;
a detection unit that detects smoke concentration based on smoke particles contained in the air sucked through the suction nozzle;
a wind speed switching unit that switches the suction strength by switching the flow speed when sucking air through the suction nozzle;
Equipped with
a smoke concentration display section that displays the smoke concentration detected by the detection section;
When the suction strength is increased by the wind speed switching section, the display range of the smoke concentration display section is changed to a finer numerical range, and when the suction strength is decreased using the wind speed switching section, the smoke The present invention is characterized by comprising a control section that changes the display range of the concentration display section to a range with a larger numerical value .

Further, the smoke detection device according to the invention of claim 2 includes a suction nozzle having an air suction port;
a detection unit that detects smoke concentration based on smoke particles contained in the air sucked through the suction nozzle;
a wind speed switching unit that switches the suction strength by switching the flow speed when sucking air through the suction nozzle;
Equipped with
a smoke concentration display section that displays the smoke concentration detected by the detection section;
The present invention is characterized by comprising a control section that automatically switches the display range of the smoke concentration display section according to the smoke concentration detection sensitivity of the detection section that changes depending on the flow velocity.

Further, the smoke detection device according to the invention of claim 3 includes an airflow sensor that is provided in the flow path of the air sucked through the suction nozzle and can measure the flow velocity of the sucked air,
The control unit is configured to detect a failure occurrence state based on a switching state of the suction strength by the wind speed switching unit and an air flow velocity detected by the airflow sensor.

Further, the smoke detection device according to a fourth aspect of the present invention is characterized in that the control section notifies the occurrence of a failure when the failure occurrence state is detected.

According to the smoke detection device according to the present invention, the air suction state can be changed at any time in the portable smoke detection device.

It is a top view of the smoke detection device in this embodiment. FIG. 3 is a front view of the smoke detection device. It is an enlarged view of an alarm display part. FIG. 3 is a plan view of the smoke detection device with the handle portion being held by hand. FIG. 2 is a block diagram showing the configuration of a smoke detection device. FIG. 3 is a cross-sectional view of a suction nozzle that is expandable and retractable. It is a front view when the center of gravity position of a housing|casing is adjusted.

Embodiments of the present invention will be described in detail with reference to the drawings. The smoke detection device of this embodiment is portable, and is used by a worker to move within a monitoring area while holding it in his/her hand to identify the location where smoke is generated. FIG. 1 shows a plan view of the smoke detection device in this embodiment, and FIG. 2 shows a front view of the smoke detection device. As shown in these figures, the smoke detection device of this embodiment has a housing 1 that can be held by hand.

The housing 1 is formed into a substantially rectangular box shape. A suction nozzle 10 is provided so as to extend in one direction from one side of the housing 1. The suction nozzle 10 has a hollow pipe portion 11 that is directly connected to the housing 1, and the tip thereof is a suction port 12 that is open. The suction port 12 communicates with the inside of the casing 1, and air sucked from the suction port 12 can be taken into the casing 1. Furthermore, an airflow sensor 13 is provided inside the pipe portion 11 to measure the flow velocity of the sucked air.

A handle portion 15, a smoke concentration display portion 16, a power switch 25, and a wind speed changeover switch 22a are provided on a surface of the housing 1 that is perpendicular to the surface on which the suction nozzle 10 is provided. The handle portion 15 is shaped like a handle that can be held by the operator. Further, the smoke concentration display section 16 is a bar graph-shaped display section, and can display the detected smoke concentration in real time. The smoke concentration display section 16 is not limited to a bar graph, and may be of other forms such as one that displays the smoke concentration numerically or an indicator. Further, the smoke concentration display section 16 may be provided with a switch for changing the range of smoke concentration to be displayed, or a volume switch for continuously changing the range. The power switch 25 can turn on and off the power supply to the smoke detection device. The wind speed changeover switch 22a can change the flow speed of air sucked by the suction nozzle 10.

A reset switch 26, an alarm display section 27, and a fan switch 28 which is an operation section are provided on the surface of the housing 1 that is perpendicular to the surface where the suction nozzle 10 is provided and the surface where the handle section 15 and the smoke concentration display section 16 are provided. It will be done. The reset switch 26 is operated to return to a normal state when an error occurs in the smoke detection device. Further, the fan switch 28 can turn on and off a suction fan provided inside the housing 1 . When performing smoke detection, the suction fan inside the housing 1 is turned on, and when the worker moves, the suction fan is turned off, so that the suction fan can be operated only when necessary. Thereby, battery consumption can be suppressed.

FIG. 3 shows an enlarged view of the alarm display section 27. The alarm display unit 27 includes a caution light, a warning light, and a warning light in response to an increase in the detected smoke concentration. It also has a power light that indicates power supply, a fault representative light that indicates the occurrence of a fault, and a suction check light that indicates that the suction system is clogged.

FIG. 4 shows a plan view of the smoke detection device with the handle portion 15 being held by hand. As shown in this figure, the operator can hold the housing 1 by gripping the handle 15 with one hand. Since the handle part 15 and the suction nozzle 10 are both integrally provided in the housing 1, the operator can grasp the handle part 15 with his/her hand and change the direction of the hand to open the suction nozzle 10. You can also change the direction it faces.

FIG. 5 shows a block diagram showing the configuration of the smoke detection device. As shown in this figure, the housing 1 includes a control section 20 that controls the smoke detection device, a smoke detection unit 21 that detects smoke concentration, a suction unit 22 that sucks air, and a control section 20 that controls the smoke detection device. It has a power supply section 23 that supplies power. The operation of the smoke detection unit 21 and the suction unit 22 is controlled by the control section 20. The power supply section 23 consists of a rechargeable battery.

Further, the control section 20 is connected to the smoke concentration display section 16 , a power switch 25 , and a reset switch 26 . When the power switch 25 is operated from off to on, power is supplied from the power supply section 23 to each section, and the control section 20, smoke detection unit 21, suction unit 22, etc. are put into operation.

Further, the control section 20 is connected to a sound output section 29 including the above-mentioned alarm display section 27, fan switch 28, wind speed changeover switch 22a, airflow sensor 13, and a speaker capable of outputting sound. The control unit 20 outputs an audio signal depending on the state such as normal, caution, warning, alarm, or failure, and the audio output unit 29 sounds a buzzer or outputs audio based on the audio signal. The wind speed changeover switch 22a can change the suction strength of the suction unit 22 via the control section 20. Thereby, the flow rate of air sucked from the suction port 12 can be changed.

The range of smoke concentration displayed on the smoke concentration display section 16 described above may be automatically switched by the control section 20 as the wind speed changeover switch 22a is switched. For example, if the air velocity changeover switch 22a is operated to increase the flow velocity of the air sucked from the suction port 12, smoke can be detected with higher sensitivity. also change to a finer numerical range. Conversely, when the flow velocity of the air sucked from the suction port 12 is decreased, the smoke concentration display section 16 is changed to a higher value range. Thereby, the range of the smoke density display section 16 can be automatically set to be appropriate.

The smoke detection unit 21 takes in air sucked through the suction nozzle 10 into a lead-in pipe, and forms a smoke detection point of about 1 micrometer by focusing a laser beam on the airflow flowing through the lead-in pipe. The scattered light generated when smoke particles pass through this smoke detection point is received by a photodiode placed parallel to the direction of the electric field component E of the laser beam, and a detection pulse is output and counted. It is possible to detect minute smoke concentrations. Information on the smoke concentration detected by the smoke detection unit 21 is sent to the control section 20, and the control section 20 can cause the smoke concentration display section 16 to display a display according to the smoke concentration detected by the smoke detection unit 21.

The suction unit 22 has a suction fan therein, and can thereby suck air from the suction port 12 of the suction nozzle 10. Air sucked from the suction nozzle 10 is taken into the smoke detection unit 21 as described above. Further, although not shown, an exhaust port is formed on the bottom surface of the casing 1, and air is exhausted from this exhaust port.

The airflow sensor 13 provided within the pipe section 11 of the suction nozzle 10 measures the flow velocity of the air within the pipe section 11 when air is being sucked by the suction unit 22, and transmits the information to the control section 20. . Thereby, the control unit 20 can grasp the switching state of the wind speed changeover switch 22a and the fact that air is not being sucked. If the air flow velocity does not change even though the wind speed changeover switch 22a has been operated, or if it is detected that air is not being sucked, the control unit 20 displays an alarm message on the alarm display unit 27 indicating that a failure has occurred. At the same time, the sound output unit 29 generates a sound indicating that a failure has occurred.

Furthermore, the control unit 20 can control the suction fan and adjust the range of the smoke concentration display unit 16 based on the air flow velocity detected by the airflow sensor 13. Control of the suction fan and adjustment of the range of the smoke concentration display section 16 are performed as follows. First, the suction fan is initially controlled so that the air flow rate detected by the air flow sensor 13 becomes high. At this time, since the amount of suction is large, it is in a highly sensitive state that allows detection even if the amount of smoke is small. Further, in this state, by setting the smoke concentration display section 16 to a fine numerical range, even the detection of a small amount of smoke can be appropriately displayed on the smoke concentration display section 16.

In a high-sensitivity state, the amount of air suction is large and the flow of air around the suction nozzle 10 is disturbed, so it may be difficult to accurately identify the location where smoke is generated. Therefore, when smoke is detected in the high-sensitivity state, the control unit 20 controls the suction fan so that the air flow rate detected by the airflow sensor 13 is reduced, thereby setting the suction fan in a low-sensitivity state. In this state, by setting the smoke concentration display section 16 to a large value range, the smoke concentration display section 16 can accurately specify the location where smoke is generated.

Although the airflow sensor 13 is provided inside the pipe portion 11 in this embodiment, the present invention is not limited thereto, and may be provided in the air flow path within the housing 1. For example, the airflow sensor 13 can be placed immediately before the smoke detection unit 21.

The power supply section 23 is connected to the power supply circuit section 24. The power supply circuit section 24 can be connected to an AC plug connectable to an AC outlet, and by inputting 100 volts of AC, it can convert it into a predetermined DC voltage and output it to the power supply section 23 . As a result, power is inputted to the power supply section 23 from the power supply circuit section 24, and the power supply section 23 is charged.

Next, a method of using the smoke detection device of this embodiment will be explained. A fixed smoke detection device is installed in the monitoring area, and when this smoke detection device detects a smoke concentration higher than a predetermined value, a worker takes the smoke detection device of this embodiment and returns to the monitoring area. work to identify the location where smoke is generated. At this time, the operator holds the handle portion 15 of the housing 10 with one hand while performing the work.

The operator operates the power switch 25 from off to on to turn on the power to the smoke detection device. The worker then moves to a location where smoke is likely to occur, for example, near the server if the monitored area is a computer room. When the operator reaches a place where smoke is likely to be generated, the operator operates the fan switch 28 to operate the suction unit 22. Then, the suction ports 12 are directed to various locations to suck air, and the smoke detection unit 21 detects the smoke concentration. Since the smoke density is displayed on the smoke density display section 16 at hand, the operator can grasp the smoke density in real time. In addition, the display state of the alarm display section 27 of the housing 1 changes depending on the level of smoke concentration, and if smoke is generated from the location toward which the suction port 12 is directed, this can be immediately recognized. be able to.

In the smoke detection device of this embodiment, the suction nozzle 10, the smoke detection unit 21, etc. are integrally provided in the housing 1 having the handle portion 15, so that the operator can use the suction port 12 at various locations with one hand. It can be turned around and is easy to handle. Furthermore, the switches provided on the housing 1 can be easily operated even while directing the suction nozzle 10 to various locations.

Although the embodiment of the present invention has been described above, the application of the present invention is not limited to this embodiment, and can be applied in various ways within the scope of the technical idea. For example, in this embodiment, the handle portion 15 is shaped like a handle, but it may have any other shape as long as it allows the housing 1 to be held by hand. Further, a plurality of handle portions may be formed, and in that case, they may be provided in a portion of the suction nozzle 10 that is close to the housing 1.

Further, an actuation switch such as a microswitch may be provided near the suction port 12 at the tip of the suction nozzle 10. The activation switch is connected to the control unit 20 and is switched from off to on by pressing. When the suction nozzle 10 is brought close to the detection target and the activation switch near the suction port 12 comes into contact with the detection target and is turned on, the suction unit 22 is operated to suck air into the smoke detection unit 21. Thereby, the suction unit 22 can be operated only when the suction port 12 approaches the detection target, so battery consumption can be suppressed.

Further, the suction nozzle 10 may be detachably attached to the housing 1. In this case, when storing the smoke detection device, the suction nozzle 10 can be removed from the housing 1 to improve storage performance.

Furthermore, the suction nozzle may be configured to be expandable and retractable. A cross-sectional view of the extensible suction nozzle 30 is shown in FIG. The extensible suction nozzle 30 includes, for example, a first pipe member 31 and a second pipe member 32. One end surface of the first pipe member 31 has a small diameter opening 31a. Further, the other end surface of the first pipe member 31 has an opening 31b that substantially matches the outer diameter of the second pipe member 32. One end of the second pipe member 32 is arranged inside the hollow of the first pipe member 31, and an opening 32a is formed in the end surface. In addition, a protrusion 32b that protrudes in the radial direction is formed in a portion of the second pipe member 32 that is disposed inside the hollow of the first pipe member 31, and is approximately adapted to the inner diameter of the first pipe member 31. are doing. The outer diameter of the protruding portion 32b is larger than the opening 32a of the first pipe member 31. Therefore, when the second pipe member 32 is extended, the protruding portion 32b is removed from the opening 32a of the first pipe member 31. You can't get out and you can stay in that position. Furthermore, the second pipe member 32 can slide relative to the first pipe member 31 and be housed in the hollow interior, as shown by the broken line in the figure. The end of the second pipe member 32 on the protrusion 32b side can contact the end surface of the first pipe member 31 on the opening 31a side, and can be prevented from moving any further. Thereby, the second pipe member 32 can be stored in the first pipe member 31, so the length of the suction nozzle 30 can be shortened and the storage property can be improved. Furthermore, since the hollow interiors of each pipe member are communicated in the length direction through the openings, air can be reliably sucked.

By adjusting the center of gravity position of the suction nozzle 10 or the housing 1, handling can be made easier. Since the suction nozzle 10 is elongated, it is difficult to handle it if the tip side is heavy. Therefore, by configuring the suction nozzle 10 so that the center of gravity is biased toward the base by making the wall thickness smaller toward the tip side, the suction nozzle 10 can be easily maneuvered to various locations. I can do it.

Furthermore, the position of the center of gravity of the housing 1 can be adjusted by arranging heavy objects inside the housing 1. FIG. 7 shows a front view when the center of gravity position of the housing 1 is adjusted. Since a heavy object such as a battery is installed inside the casing 1, by adjusting its placement position, the center of gravity 1a of the casing 1 can be moved closer to the surface where the suction nozzle 10 is provided than the center position of the handle part 15. It can be set to the opposite side. Further, it is desirable that the center of gravity position 1a of the housing 1 be located near the lower surface of the housing 1 opposite to the upper surface where the handle portion 15 is provided. By holding the handle portion 15 provided on the housing 1 by hand, the housing 1 is tilted so that the suction nozzle 10 side faces upward. Since smoke rises upward, the suction nozzle 10 is often directed at high places. Therefore, in the smoke detection device, the housing 1 is tilted so that the suction nozzle 10 faces upward, thereby making it easier to handle the device.

The position of the center of gravity of the housing 1 does not necessarily have to be rearward than the center position of the handle portion 15, and the arrangement of the heavy object may be adjusted so that it is as rearward as possible. This also makes it possible to improve the ease of handling the suction nozzle 10 when holding the housing 1. Furthermore, a weight member may be disposed within the housing 1 in order to adjust the center of gravity of the housing 1. Furthermore, by adjusting the position of the handle portion 15 in the housing 1, the relative position with respect to the center of gravity of the housing 1 can be changed so that the suction nozzle 10 can easily face upward.

1 Housing 10 Suction nozzle 11 Pipe section 12 Suction port 15 Handle section 16 Smoke concentration display section 20 Control section 21 Smoke detection unit 22 Suction unit 23 Power supply section 24 Power supply circuit section 25 Power switch 26 Reset switch 27 Alarm display section 28 Fan switch

Claims (4)

a suction nozzle having an air suction port;
a detection unit that detects smoke concentration based on smoke particles contained in the air sucked through the suction nozzle;
a wind speed switching unit that switches the suction strength by switching the flow speed when sucking air through the suction nozzle;
Equipped with
a smoke concentration display section that displays the smoke concentration detected by the detection section;
When the suction strength is increased by the wind speed switching section, the display range of the smoke concentration display section is changed to a finer numerical range, and when the suction strength is decreased using the wind speed switching section, the smoke A portable smoke detection device, comprising: a control section that changes the display range of the concentration display section to a higher numerical value range. a suction nozzle having an air suction port;
a detection unit that detects smoke concentration based on smoke particles contained in the air sucked through the suction nozzle;
a wind speed switching unit that switches the suction strength by switching the flow speed when sucking air through the suction nozzle;
Equipped with
a smoke concentration display section that displays the smoke concentration detected by the detection section;
A portable smoke detection device comprising: a control section that automatically switches a display range of the smoke concentration display section according to a smoke concentration detection sensitivity of the detection section that changes depending on the flow velocity. An airflow sensor is provided in the flow path of the air sucked through the suction nozzle and is capable of measuring the flow velocity of the sucked air,
3. The control unit detects a failure occurrence state based on a switching state of the suction strength by the wind speed switching unit and an air flow velocity detected by the airflow sensor. portable smoke detection device. The smoke detection device according to claim 3, wherein the control unit notifies the occurrence of a failure when the failure occurrence state is detected.

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