JP6622075B2 - Smoke detector - Google Patents

Description

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

  In a clean room in a computer room or a semiconductor manufacturing facility where a server or the like is installed, a high-sensitivity smoke detector capable of detecting minute smoke is installed. The high-sensitivity smoke detector sucks air from the sampling tube installed in the monitoring area, optically detects particles floating in the sucked air using laser light, and the number of particles exceeds a predetermined value. In the case, an alarm is output.

  In addition to such a fixed smoke detector, a portable smoke detector is also known. The portable smoke detector is used by being brought into a monitoring area, and includes a suction nozzle that sucks air and a main body that detects smoke concentration in the air sucked from the suction nozzle. An operator 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 while holding the suction nozzle by hand. And the generation | occurrence | production location of smoke can be pinpointed by directing a suction nozzle to various locations. As such a smoke detection device, for example, there is a device described in Patent Document 1.

Japanese Patent Application No. 2014-182803 Specification

  Since the portable smoke detector is divided into a main body and a suction nozzle, it is necessary to hold the main body with one hand or to be fixed to the body, and in that state the suction with the other hand The nozzle is directed toward the detection target. Although the main body and the suction nozzle are connected by a flexible hose member or the like, it is not always easy to handle the suction nozzle in this form. Further, it is difficult to operate the main body while directing 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 in which a suction nozzle can be easily handled and various operations can be easily performed.

In order to solve the above-mentioned problem, the smoke detection device according to the invention of claim 1 is provided with a suction nozzle having an air suction port at the tip on one surface of the housing ,
The housing has a detection unit for detecting smoke concentration based on smoke particles contained in the air sucked through the suction nozzle inside, and a handle unit gripped by hand on the upper surface ,
The housing is configured to have a center of gravity closer to a side opposite to the one surface on which the suction nozzle is provided than a central position of the handle portion .

According to the first aspect of the present invention, since the suction nozzle is provided in the case that can be gripped by hand, the suction nozzle can be easily directed to various places by holding the case with one hand, and the handling is good. Can be. In addition, when the handle is held by the handle, the case tilts so that the suction nozzle side faces up, making it easier to point the suction nozzle upward and make it easier to point the suction nozzle to the smoke generation location. be able to.

The smoke detector according to the invention of claim 2 is characterized in that the casing has a center of gravity near a lower surface opposite to an upper surface on which the handle portion is provided .

According to the second aspect of the present invention, the casing can be tilted so that the suction nozzle faces upward, whereby the handling property can be improved.

Furthermore, the smoke detection device according to the invention of claim 3 is characterized in that the suction nozzle has a thickness on the tip side thinner than a thickness on the housing side .

According to the third aspect of the invention, the center of gravity of the suction nozzle is biased toward the housing, and the handling performance for directing the suction nozzle to various places can be improved.

  According to the smoke detection device of the present invention, it is possible to easily handle the suction nozzle and to easily operate the operation unit, and to quickly and efficiently identify the smoke generation location.

It is a top view of the smoke detection apparatus in this embodiment. It is a front view of a smoke detection device. It is an enlarged view of an alarm display part. It is a top view of the smoke detection apparatus of the state which hold | gripped the handle part by hand. It is a block diagram showing the structure of the smoke detection apparatus. It is sectional drawing of the suction nozzle made extendable. It is a front view at the time of adjusting the gravity center position of a housing | casing.

  Embodiments of the present invention will be described in detail with reference to the drawings. The smoke detection device of the present embodiment is portable, and is used by an operator to move in a monitoring area by hand and specify a location where smoke is generated. FIG. 1 shows a plan view of the smoke detector in the present embodiment, and FIG. 2 shows a front view of the smoke detector. As shown in these drawings, the smoke detection device of the present embodiment has a housing 1 that can be held by hand.

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

  A handle portion 15, a smoke density display portion 16, a power switch 25, and a wind speed changeover switch 22 a are provided on a surface orthogonal to the surface on which the suction nozzle 10 of the housing 1 is provided. The handle portion 15 is formed in a handle shape that can be gripped by the operator. The smoke density display unit 16 is a bar graph-like display part, and can display the detected smoke density in real time. Note that the smoke density display unit 16 is not limited to a bar graph type, and may be another form such as a smoke density display with a numerical value or an indicator. In addition, the smoke density display unit 16 can be provided with a switch for switching the range of smoke density to be displayed or a volume switch for continuously changing the range. The power switch 25 can perform an on / off operation of power supply in the smoke detection device. The wind speed switching switch 22a can switch the flow rate of the air sucked by the suction nozzle 10.

  A reset switch 26, an alarm display unit 27, and a fan switch 28 serving as an operation unit are provided on the surface of the housing 1 on which the suction nozzle 10 is provided and on the surface orthogonal to the surface on which the handle portion 15 and the smoke density display portion 16 are provided. It is done. The reset switch 26 is operated when returning to a normal state when an error occurs in the smoke detection device. The fan switch 28 can turn on and off a suction fan provided in the housing 1. When performing smoke detection, the suction fan in the housing 1 is turned on, and when the operator 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 unit 27. The alarm display unit 27 includes a caution light, a warning light, and a warning light corresponding to the detected increase in smoke density. In addition, a power lamp indicating power supply, a fault representative lamp indicating occurrence of a fault, and a suction check lamp indicating clogging of the suction system are provided.

  In FIG. 4, the top view of the smoke detection apparatus of the state which hold | gripped the handle part 15 with the hand is shown. As shown in this figure, the case 1 can be held by the operator holding the handle portion 15 with one hand. Since both the handle portion 15 and the suction nozzle 10 are integrally provided in the housing 1, the operator holds the handle portion 15 by hand and changes the direction of the hand, whereby the suction nozzle 10. You can also change the direction of the.

  FIG. 5 is a block diagram showing the configuration of the smoke detection device. As shown in this figure, the housing 1 includes a control unit 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 smoke detection device. And a power supply unit 23 for supplying power. The operations of the smoke detection unit 21 and the suction unit 22 are controlled by the control unit 20. The power supply part 23 consists of a rechargeable battery.

  Further, the smoke density display unit 16, the power switch 25 and the reset switch 26 are connected to the control unit 20. When the power switch 25 is operated from OFF to ON, power is supplied from the power supply unit 23 to each unit, and the control unit 20, the smoke detection unit 21, the suction unit 22 and the like are in operation.

  Further, the control unit 20 is connected to the above-described alarm display unit 27, fan switch 28, wind speed changeover switch 22 a, airflow sensor 13, and sound output unit 29 including a speaker capable of sound output. An audio signal is output from the control unit 20 in accordance with states such as normal, caution, alert, alarm, failure, and the sound output unit 29 performs a buzzer sound or audio output based on the audio signal. The wind speed changeover switch 22 a can change the suction intensity by the suction unit 22 via the control unit 20. Thereby, the flow velocity of the air sucked from the suction port 12 can be changed.

  The smoke density range displayed on the smoke density display section 16 described above may be automatically switched by the control section 20 in accordance with the switching of the wind speed switch 22a. For example, when the wind speed 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. Change to a finer numerical range. Conversely, when the flow velocity of the air sucked from the suction port 12 is reduced, the smoke concentration display unit 16 is changed to a large numerical range. As a result, the range of the smoke density display unit 16 can be automatically set appropriately.

  The smoke detection unit 21 takes in the air sucked through the suction nozzle 10 into a drawing tube and forms an image of a laser beam on the airflow flowing through the drawing tube to form a smoke detection point of about 1 micrometer. Scattered light generated when smoke particles pass through this smoke detection point is received by a photodiode arranged in parallel with the direction of the electric field component E of the laser light, and a detection pulse is output and counted. A minute smoke density can be detected. Information on the smoke density detected by the smoke detection unit 21 is sent to the control unit 20, and the control unit 20 can cause the smoke density display unit 16 to display according to the smoke density detected by the smoke detection unit 21.

  The suction unit 22 has a suction fan inside, and can thereby suck air from the suction port 12 of the suction nozzle 10. The air sucked from the suction nozzle 10 is taken into the smoke detection unit 21 as described above. Moreover, although not shown in figure in the bottom face of the housing | casing 1, the discharge port is formed and air is discharged | emitted from this discharge port.

  The airflow sensor 13 provided in the pipe part 11 of the suction nozzle 10 measures the flow velocity of the air in the pipe part 11 and transmits the information to the control part 20 when the air is sucked by the suction unit 22. . Thereby, the control part 20 can grasp | ascertain that the switching state by the wind speed switch 22a and the suction of air are not being carried out. When it is detected that the air flow rate has not changed even though the wind speed changeover switch 22a has been operated, or the air has not been sucked, the control unit 20 causes the alarm display unit 27 to fail. In addition to the display, the sound output unit 29 generates a failure sound.

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

  In the high sensitivity state, the amount of air sucked is large, and the flow of air around the suction nozzle 10 is disturbed, so it may be difficult to accurately identify the smoke generation location. Therefore, when smoke is detected in the high sensitivity state, the control unit 20 controls the suction fan so that the flow velocity of the air detected by the airflow sensor 13 becomes small, thereby setting the low sensitivity state. In this state, by setting the smoke concentration display unit 16 to a large numerical range, the smoke generation location can be accurately specified by the smoke concentration display unit 16.

  Note that the airflow sensor 13 is provided in the pipe portion 11 in the present embodiment, but is not limited thereto, and may be provided in an air flow path in the housing 1. For example, the airflow sensor 13 can be disposed immediately before the smoke detection unit 21.

  The power supply unit 23 is connected to the power supply circuit unit 24. The power supply circuit unit 24 can be connected to an AC plug that can be connected to an AC outlet. By inputting 100 VAC, the power supply circuit unit 24 can be converted into a predetermined DC voltage and output to the power supply unit 23. As a result, power is input to the power supply unit 23 from the power supply circuit unit 24 and charging is performed.

  Next, the usage method of the smoke detection apparatus of this embodiment is demonstrated. A fixed smoke detector is installed in the monitoring area, and when a smoke concentration higher than a predetermined level is detected in the smoke detector, the operator holds the smoke detector of the present embodiment, and the monitoring area Work to identify the location of smoke generation. At this time, the worker works by holding the handle portion 15 of the housing 10 with one hand.

  The operator operates the power switch 25 from off to on to turn on the smoke detector. Next, the worker moves to a location where smoke is likely to occur, for example, if the monitored area is a computer room, close to the server. When reaching 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 port 12 is directed to various places to suck air, and the smoke detection unit 21 detects the smoke density. Since the smoke density is displayed on the hand smoke density display section 16, the operator can grasp the smoke density in real time. Further, when the display state of the alarm display unit 27 of the housing 1 changes according to the smoke concentration level and smoke is generated from the place where the suction port 12 is directed, the fact is immediately grasped. be able to.

  In the smoke detection device of the present embodiment, the suction nozzle 10 and the smoke detection unit 21 are integrally provided in the housing 1 having the handle portion 15, so that the operator can place the suction port 12 in various places with one hand. Can be directed and easy to handle. In addition, a switch or the like provided on the housing 1 can be easily operated while the suction nozzle 10 is directed to various places.

  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 its technical idea. For example, in the present embodiment, the handle portion 15 is formed in a handle shape, but may have another shape as long as the housing 1 can be gripped by hand. In addition, a plurality of handle portions may be formed. In that case, the handle portion may be provided in a portion of the suction nozzle 10 close to the housing 1.

  Further, an operation switch composed of a micro switch or the like may be provided in the vicinity of the suction port 12 at the tip of the suction nozzle 10. The operation 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 operation 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, since the suction unit 22 can be operated only when the suction port 12 approaches the detection target, battery consumption can be suppressed.

  Further, the suction nozzle 10 may be detachable from 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 the storage property.

Furthermore, the suction nozzle may be configured to be extendable and contractible. FIG. 6 shows a cross-sectional view of the suction nozzle 30 that can be expanded and contracted. The expandable / contractible 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. In addition, the other end surface of the first pipe member 31 has an opening 31 b that substantially matches the outer diameter of the second pipe member 32. One end of the second pipe member 32 is disposed inside the hollow of the first pipe member 31, and an opening 32a is formed on the end surface. Further, a projecting portion 32b protruding 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 substantially conforms to the inner diameter of the first pipe member 31. are doing. The outer diameter of the protrusion 32b is larger than the opening 31b of the first pipe member 31, thus, when the stretched second pipe member 32, the protrusion 32b from the opening 31b of the first pipe member 31 Can't get out, can stop at that position. Moreover, the 2nd pipe member 32 can be slid with respect to the 1st pipe member 31, and can be accommodated in a hollow interior, as shown with the broken line in the figure. The end of the second pipe member 32 on the protruding portion 32b side abuts on the end surface of the first pipe member 31 on the opening 31a side, and can be prevented from moving any further. Thereby, since the 2nd pipe member 32 can be stored in the 1st pipe member 31, the length of the suction nozzle 30 can be shortened and storage property can be made more favorable. Moreover, since the hollow interior of each pipe member communicates in the length direction by the opening, air can be reliably sucked.

  By adjusting the position of the center of gravity of the suction nozzle 10 or the housing 1, the handling can be made easier. Since the suction nozzle 10 is long, it is difficult to handle it if the weight on the tip side is large. Therefore, by making the center of gravity the center of the suction nozzle 10 by deviating the thickness toward the tip end side of the suction nozzle 10 or the like, the handling performance for directing the suction nozzle 10 to various places is improved. Can do.

  Further, the position of the center of gravity of the housing 1 can be adjusted by the arrangement of heavy objects inside the housing 1. FIG. 7 shows a front view when the position of the center of gravity of the housing 1 is adjusted. Since a heavy object such as a battery is provided in the housing 1, a surface on which the suction nozzle 10 is provided more than the center position of the handle portion 15 at the center of gravity 1 a of the housing 1 by adjusting the arrangement position thereof. And on the opposite side. The center of gravity position 1a of the housing 1 is desirably close to the lower surface opposite to the upper surface on which the handle portion 15 of the housing 1 is provided. By holding the handle portion 15 provided in the housing 1 by hand, the housing 1 is inclined so that the suction nozzle 10 side faces upward. Since smoke rises upward, there are many places where the suction nozzle 10 is directed. For this reason, in the smoke detection device, the housing 1 can be tilted so that the suction nozzle 10 faces upward, whereby the handling property can be improved.

  The position of the center of gravity of the housing 1 does not necessarily have to be rearward of the center position of the handle portion 15, and the arrangement of heavy objects may be adjusted to be as rearward as possible. Also by this, the handling property of the suction nozzle 10 when holding the housing 1 can be improved. Further, a weight member may be arranged in the housing 1 in order to adjust the position of 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.

DESCRIPTION OF SYMBOLS 1 Case 10 Suction nozzle 11 Pipe part 12 Suction port 15 Handle part 16 Smoke density display part 20 Control part 21 Smoke detection unit 22 Suction unit 23 Power supply part 24 Power supply circuit part 25 Power switch 26 Reset switch 27 Alarm display part 28 Fan switch

Claims (3)

A suction nozzle having an air suction port at the tip is provided on one surface of the housing ,
The housing has a detection unit for detecting smoke concentration based on smoke particles contained in the air sucked through the suction nozzle inside, and a handle unit gripped by hand on the upper surface ,
The portable smoke detector according to claim 1, wherein the casing has a center of gravity closer to a side opposite to the one surface on which the suction nozzle is provided than a center position of the handle portion . The smoke detection apparatus according to claim 1, wherein the casing has a center of gravity near a lower surface opposite to an upper surface on which the handle portion is provided. 3. The smoke detection device according to claim 1, wherein the suction nozzle has a tip-side wall thickness thinner than the casing-side wall thickness.

Images