JP4676363B2 - Portable gas alarm - Google Patents

Description

  The present invention relates to a portable gas alarm.

In general, for example, in underground construction sites, tunnels, places where people enter, work areas, etc., there is a risk that dangerous gases such as carbon monoxide gas or hydrogen sulfide gas may be contained in the air of the environment. In many cases, there is a possibility that the air in the environmental atmosphere is in a dangerous state or in a dangerous state, such as when the oxygen gas concentration in the air may be lowered.
And when it becomes dangerous to humans due to the high concentration of dangerous gas contained in the air or low oxygen gas concentration, it is necessary to immediately know that It is.
From such a request, various types of portable gas detectors have been proposed so far (see, for example, Patent Document 1).

  Thus, such a portable gas detector is required to be configured to be sufficiently small so as not to be a major obstacle in performing the intended work, for example, and for example in a manhole. Since it may be used to measure the air condition of the gas measurement target space such as where water is collected, etc., a waterproof structure that prevents water from entering from the outside is adopted. Is desirable.

JP 2002-257768 A

  The present invention has been made based on the above circumstances, and is a portable gas alarm device comprising a gas alarm body and a gas sensor detachably attached to the gas alarm body. It is an object of the present invention to provide a portable gas alarm device that can be configured as a convenient small-sized device, has high convenience in use, and can easily attach and detach a gas sensor.

The portable gas alarm device of the present invention includes a box-shaped casing that can be held and held by hand, and a functional member related to a gas detection operation is disposed in an upper half portion inside the casing and a lower part. The battery compartment and the sensor mounting part are arranged on the left and right side of the gas alarm device body,
A sensor body having a columnar shape as a whole, and a cylindrical holder member that holds the sensor body inside and an adapter made of a cylindrical grip member made of an elastic body provided at the tip of the holder member have one structure. A gas sensor configured as a body is detachably attached to a sensor attachment portion of a gas alarm device main body via a ring-shaped packing provided on an outer peripheral surface of a holder member.

  In the portable gas alarm device of the present invention, the grip member preferably has an axial length of 13 to 20 mm.

In the portable gas alarm device of the present invention, a seal member made of neoprene coated with fluororesin is mounted between the inner peripheral surface of the holder member and the outer peripheral surface of the sensor body. It is preferable.
Furthermore, it is preferable that the grip member has a protruding portion that protrudes outward from the outer end of the sensor body in a state where the sensor body is held inside the holder.
In such a configuration, the calibration gas supply head for supplying the calibration gas for the sensor body related to the gas sensor mounted on the gas alarm body can be mounted on the protruding edge portion of the grip member. It can be configured.

Further, in the portable gas alarm device of the present invention, the sensor mounting portion in the gas alarm device main body is selected from a plurality of identical gas sensors each having a sensor main body with a different type of detection target gas according to the purpose. Any one gas sensor is configured to be exchangeable with other gas sensors,
The sensor main body is preferably configured to include a storage unit in which information unique to the sensor main body is recorded.

  Moreover, it is preferable that the sensor body has a temperature detection means, and a temperature compensation condition for the gas detection signal from the sensor body is set based on temperature information detected by the temperature detection means. .

  According to the portable gas alarm device of the present invention, basically, the casing is of a size that can be held by hand, and a functional member for gas detection is arranged in the upper half of the casing. At the same time, the battery chamber and the sensor mounting part are formed side by side in the lower half, all the necessary components are rationally arranged in the casing, and the sensor body and the specific adapter are Since most of the gas sensors configured as one structure are mounted in a state where they are accommodated in the sensor mounting portion in the gas alarm device main body, the gas alarm device itself can be configured as a small one, Since the grip member of the adapter that constitutes the gas sensor is exposed to the outside, the gas sensor can be easily attached and detached, thus obtaining excellent portability and high convenience. It is possible.

  In addition, since a sealing member made of neoprene coated with fluororesin is mounted between the inner peripheral surface of the holder member and the outer peripheral surface of the sensor body, high airtightness can be obtained. Gas can be reliably introduced into the sensor body.

Furthermore, since the grip member is made of an elastic body and has a projecting edge portion, the grip member itself also functions as a shock absorber (buffer material) of the sensor body. It can be prevented from being damaged.
And, the gas supply head for calibration for supplying the calibration gas for the gas sensor mounted on the gas alarm device main body is configured to be mountable on the protruding edge portion of the grip member, so that the gas sensor is gas alarmed. Since the calibration work can be performed with the instrument mounted on the main body, high convenience can be obtained.

Furthermore, since the sensor main body constituting the gas sensor has a storage means in which information unique to the sensor main body is recorded, the operating environmental conditions of the gas alarm device main body are attached to the attached gas sensor as the gas sensor is attached. Since it is automatically set according to the requirement, it is not necessary to perform a complicated operation and high convenience can be obtained.
In addition, since the temperature compensation condition is automatically set based on the temperature information from the temperature detection means, it is possible to perform highly reliable gas detection, but it is not necessary to perform complicated operations. Yes, high convenience can be obtained.

The present invention will be described below with reference to the drawings.
1 is a front view showing a configuration example of a portable gas alarm device according to the present invention, FIG. 2 is a plan view of the portable gas alarm device shown in FIG. 1, and FIG. 3 is a portable gas alarm device shown in FIG. 4 is a bottom view of the portable gas alarm shown in FIG. 1, FIG. 5 is a left side view of the portable gas alarm shown in FIG. 1, and FIG. 6 is a portable type shown in FIG. FIG. 7 is a vertical cross-sectional view taken along the line AA in FIG. 1, FIG. 8 is a cross-sectional view taken along the line BB in FIG. 1, and FIG. 9 is a cross-sectional view taken along the line CC in FIG. FIG. 10 is a cross-sectional view taken along the line DD of FIG. Hereinafter, unless otherwise specified, the vertical direction in FIG. 1 is referred to as “vertical direction” and the horizontal direction in FIG. 1 is referred to as “horizontal direction”. However, the usage mode of the gas alarm is limited. is not.
The portable gas alarm (hereinafter simply referred to as “gas alarm”) 10 includes a casing 11 having a generally box shape that can be held and held by hand. A functional member related to the gas detection operation is arranged in the part, and a battery alarm body having a battery chamber 13 and a sensor mounting part 15 arranged side by side in the lower half is provided.

The casing 11 includes a back side casing member 12 and a front side casing member 20 connected and fixed to the back side casing member 12 via a ring-shaped packing 25 with fixing screws 11A, as shown in FIG. As described above, the battery chamber 13 forming the substantially cylindrical sensor mounting portion 15 and the battery receiving portion 13A is formed by the rear casing member 12 alone. Here, the ring-shaped packing 25 is disposed over the entire circumference of the contact surface 26 between the back-side casing member 12 and the front-side casing member 20.
As shown in FIG. 12, the front casing member 20 has a relatively large size of about 25% of the entire front area of the front casing member 20, which forms a display part and an alarm light emitting part in the upper half area. The front opening 21 and the operation portion forming opening 22 having a large occupied area are formed in a position aligned vertically, and the left and right positions are located between the front opening 21 and the operation portion forming opening 22 on the back surface. A flat plate-like reinforcing member 23 is provided.

  The upper half of the casing 11 includes a flat display substrate 46A, a flat power supply substrate 46B including a power supply circuit and a charging circuit, and a gas detection signal processing circuit for processing signals from the gas sensor. The flat CPU board 46C is arranged in three dimensions so as to extend in the vertical direction along the front and back surfaces of the casing 11 in parallel with each other, and the display board 46A is held and fixed to the front casing member 20. At the same time, the power supply board 46B and the CPU board 46C are held and fixed to the back side casing member 12.

On the display substrate 46A, a panel-like display mechanism 47 made of, for example, a liquid crystal display panel in which the detected gas type and its concentration are displayed in a region facing the front opening 21 of the front casing member 20 and this panel. An alarm light-emitting element 48 made of a light-emitting diode (not shown) is disposed above the state display mechanism 47, and there are, for example, three areas in the region facing the operation portion forming opening 22 of the front casing member 20. Switch elements 49A, 49B, 49C are arranged side by side.
A panel-like protective window member 50 in which switch drive portions 54A, 54B, 54C corresponding to the respective switch elements 49A, 49B, 49C are integrally formed includes a panel-like display mechanism 47, an alarm light-emitting element 48, and The front opening 21 in a state where each of the switch driving portions 54A, 54B, 54C is inserted into the operation portion forming opening 22 of the front casing member 20 so as to cover the entire arrangement area of the switch elements 49A, 49B, 49C. Thus, the display unit 51, the alarm light emitting unit 52, and the operation unit 53 are formed.
In addition, a light guide plate is provided at a position on the back side of the panel-like display mechanism 47, and a backlight composed of a light emitting diode (not shown) that irradiates the panel-like display mechanism 47 with light through the light guide plate. Can be configured.

  In the operation unit 53, the first operation button 53A constituting the main switch labeled “POWER” is on the right side, and the second operation button 53B constituting the changeover switch labeled “DISP” is located on the center. , Third operation buttons 53C constituting the function adjustment switch labeled “AIR” are arranged on the left side.

  In the panel-like display mechanism 47, for example, the concentration of the gas detected at the center position is displayed as a numerical value. Moreover, it can also be set as the structure displayed by switching sequentially by automatic or manual operation so that other information may be displayed.

  The CPU board 46C is provided with an electronic circuit having a function of controlling the operation of each part in the gas alarm device 10, and a storage element for storing log data detected by, for example, a gas sensor.

  As described above, the battery chamber 13 and the sensor mounting portion 15 are formed in the lower half inside the casing 11, and the battery insertion port 13B and the sensor mounting port 15 are in the same direction, specifically in the downward direction. The battery and the gas sensor are drawn out in the same direction.

The battery chamber 13 has a battery receiving portion 13A for receiving, for example, two columnar batteries 14, specifically, AA dry batteries (AA size) arranged side by side on the left and right. The battery 14 is loaded in the part 13A with the positive electrode and the negative electrode facing in opposite directions, and the battery cover 30 with the power terminal 45 provided on the back surface is accommodated in the battery insertion slot 13A. Thereby, the two batteries 14 are connected in series. The battery lid 30 is provided with a ring-shaped packing (not shown) on the side surface.
At the opening edge portion of the battery insertion opening 13A, a notch 13C is formed in the right side wall of the casing 11, and for example, even when the battery lid 30 is mounted without the battery 14 loaded, The battery cover 30 can be easily removed.

  In this gas alarm device 10, as shown in FIGS. 13 and 14, the gas sensor main body 56 and the gas sensor 55 in which the specific adapter 60 is configured as a single structure as shown in FIG. Ten sensor mounting portions 15 are detachably mounted.

As shown in FIG. 9, the sensor mounting portion 15 has a gas sensor holding sleeve member 16 mounted on its inner surface, and a connecting connector member on the upper end surface, that is, the end surface on the far side in the mounting direction of the gas sensor structure 55. 18 is installed, and any one gas sensor selected according to the purpose from among a plurality of identical gas sensors each having a sensor body 56 having a different type of gas to be detected can be replaced with another gas sensor. It is set as the structure.
Further, in the state in which the gas sensor 55 is mounted, a visual recognition opening 19 that exposes the gas name of the sensor main body 56 constituting the gas sensor 55 to the outside is formed at an outer surface position close to the sensor mounting port 15A.

The sensor main body 56 constituting the gas sensor 55 includes, for example, a sensor element 56B made of a constant potential electrolysis sensor, a memory integrally provided with the sensor element 56B, in which information unique to the sensor element 56B is recorded, and for temperature compensation A sensor substrate 57 having a thermistor, a sensor protective cover member 58 having one end (lower end in FIG. 14) that holds the sensor element 56B inserted therein, and the sensor protective cover member 58. The cap member 59 is screwed into the end portion and attached.
The sensor element 56B is a gas detection electrode structure in which a working electrode, a counter electrode, and a reference electrode each having a plate-like electrode body in which fluid flow paths are formed are stacked with an electrolyte solution holding member interposed therebetween. Are provided in the cylindrical sensor case 56C, and are pin-shaped with respect to each of the working electrode, the counter electrode, and the reference electrode at positions spaced apart from each other in the circumferential direction on the outer peripheral surface of the sensor case 56C. The external lead member 56D is arranged to extend in the axial direction. In the sensor body 56, a gas inlet 56A is formed on one surface of the sensor case 56C, and a connector portion for connecting the sensor mounting portion 15 in the gas alarm device body 10A is formed on the other surface side of the sensor substrate 57. 18 has a connector portion 57 </ b> A connected to 18. The type of the detection target gas is not particularly limited, and examples thereof include PH ₃ , SO ₂ , CO, H ₂ S, NH ₃ , Cl ₂ , and O ₃ .

  The specific adapter 60 is provided with a transparent resin holder member 61 that holds the sensor body 56 in a state in which the sensor main body 56 is accommodated therein, and an elastic member such as an elastomer that is fitted to one end portion of the holder member 61. It is comprised with the cylindrical grip member 65 which consists of a body. Here, the sensor main body 56 is held in a state where the one end surface where the gas introduction port 56 </ b> A is formed is positioned at the same level as the opening end surface of the holder member 61, for example.

As shown in FIG. 15, the holder member 61 has a grip fitting portion 62 in which a plurality of fitting protrusions 62 </ b> A are formed in one opening side portion at positions spaced apart from each other in the circumferential direction on the outer peripheral surface. An engagement mounting portion 17 (see FIG. 19) of the sleeve member 16 provided in the sensor mounting portion 15 of the gas alarm device main body 10A is provided at a portion continuing to the grip fitting portion 62 via the flange portion 63. ) Is formed.
On the inner surface of the grip fitting portion 62, a seal member made of, for example, a neoprene O-ring 67 coated with fluororesin is provided.
A ring-shaped packing 68 is attached to the outer peripheral surface of the other opening side portion of the holder member 61.

As shown in FIG. 16, the grip member 65 has a plurality of fitting holes 65 </ b> A into which the fitting protrusions 62 </ b> A of the holder member 61 are fitted, and is attached to the holder member 61. In this state, it has a protruding edge portion 66 that protrudes outward from the opening end of the holder 61 and forms a mounting space portion 66A to which a calibration gas supply head 95 described later is fitted and mounted.
The axial length of the grip member 65 is preferably 13 to 20 mm, for example. Accordingly, the gas sensor 55 can be easily attached and detached while the portion protruding outside the casing 11 is made as small as possible.

The gas alarm device 10 is configured such that, for example, a specific calibration gas supply head 95 as shown in FIG. 17 can be used to perform calibration work with the gas sensor 55 attached. ing.
The calibration gas supply head 95 includes a main body portion 96 having a fitting portion 96A that is fitted in a mounting space portion 66A formed by the protruding edge portion 66 of the grip. The gas flow paths 97A and 97B are formed so as to open at the circumferential surface positions facing each other. A connecting pipe member 98 is airtightly attached to the openings of the gas flow paths 97A and 97B on the peripheral surface of the main body 96.
Further, a recess 99 that forms a cylindrical space is formed on the end surface of the main body 96 on the fitting portion 96A side, and one gas flow path 97A is opened at a central position on the bottom surface of the recess 99. At the same time, the gas passages 97B extend in the axial direction parallel to each other in the main body 96 so that the other gas passage 97B opens at a position spaced radially outward from the opening of the one gas passage 97A. It is formed as follows.

  In a state where the gas sensor 55 is mounted on the sensor mounting portion 15 of the gas alarm device main body 10A, the gas sensor 55 is housed in the sensor mounting portion 15 except for the grip member 65 of the adapter 60 so that the outside of the casing 11 is accommodated. The portion that protrudes into the area is made as small as possible. However, since the grip member 65 protrudes to the outside, the gas sensor 55 can be easily attached and detached (replaced).

In the gas alarm device 10 described above, for example, the infrared communication port 28 for reading the gas concentration data detected by the sensor main body 56 of the gas sensor 55 and recorded in the storage element of the CPU board 46C is the right side surface of the gas alarm main body 10A. It is formed in the upper half.
Further, a protect cover 70 made of, for example, a conductive thermoplastic elastomer composition and having a mounting portion that itself is mounted on the gas alarm body 10A is detachably mounted.

As shown in FIG. 18, the protect cover 70 has a shape that matches the shape of a part of the outer surface of the casing 11 of the gas alarm device main body 10A on the inner surface, and the front surface of the gas alarm device main body 10A. A front opening 72 that exposes the display 51, the alarm light emitting unit 52, and the operation unit 53 to the outside is formed, and a gas alarm mounting opening 73 is formed on the back. Further, a gas sensor mounting opening 74 and a battery insertion opening 75 are formed on the bottom surface, and an infrared communication port exposing opening 76 is formed on the right side surface.
The protective cover 70 is configured such that the gas alarm device mounting opening 73 is opened by a human hand so that the gas alarm device main body 10A can pass through, and its shape is restored by its own elasticity. The gas alarm device main body 10 </ b> A received by the mounting portion 71 is held.
When the protect cover 70 is attached, the size of the continuous resin surface portion of the casing 11 of the gas alarm device main body 10A exposed to the outside is regulated to a predetermined size, for example, 100 cm ² or less. Therefore, the countermeasure against static electricity is sufficient and the explosion-proof property is highly reliable. Further, since the material constituting the protective cover 70 also functions as a buffer material (protective material) for the gas alarm device main body 10A due to the impact resistance of the material itself, it is possible to prevent the gas alarm device main body 10A from being broken or damaged. Can be maintained in an appropriate operating state.

  In the configuration example of the gas alarm device 10 of the present invention, the maximum size in the vertical direction (vertical direction in FIG. 1) of the gas alarm main body 10A is 131 mm, and the maximum size in the horizontal direction (left and right direction in FIG. 1) is 77 mm. The maximum dimension in the thickness direction (the direction perpendicular to the paper surface in FIG. 1) is 40 mm, and the total weight in a state in which the gas detection operation is possible (a state where the gas sensor 55 and the two batteries 14 are mounted) is 240 g. It is.

Hereinafter, the operation of the gas alarm device 10 will be described.
First, in a state where the battery 14 is loaded in the battery chamber 13, the gas sensor 55 including the sensor body 56 corresponding to the target detection target gas is selected, and this gas sensor 55 is selected as the gas sensor mounting portion 15 in the gas alarm device body 10A. Attach to.
The mounting method of the gas sensor 55 will be described in detail. As shown in FIG. 19, the gas sensor 55 is inserted into the engagement mounting portion 17 of the sleeve member 16 provided in the sensor mounting portion 15 in the gas alarm device main body 10A. A notch 17A formed so as to extend in the axial direction at one opening edge (lower opening edge in FIG. 19B), and obliquely along the peripheral surface of the sleeve member 16 continuously to the notch 17A. The guide groove 17B extends upward. By inserting the gas sensor 55 into the sensor mounting port 15A, the engagement protrusion 64 of the holder member 61 is inserted into the notch 17A as shown in FIG. Thereafter, by rotating the gas sensor 55, for example, clockwise, the engagement protrusion 64 is moved along the guide groove 17B. 55 are electrically connected to the connection connector member 18 is held stationary by the engagement attachment portion 17 of the sleeve member 16. In the mounted state of the gas sensor 55, the gas name in the sensor body 56 is exposed to the outside through the visual recognition opening 19 in the sensor mounting portion 15. In FIG. 19B, reference numeral 17C denotes an opening that exposes the display of the sensor body 56.

When the gas sensor body 10A is operated by operating the first operation button 53A of the gas alarm body 10A in a state where the gas sensor 55 is mounted, the gas sensor 55, the panel-like display mechanism 47 and other parts are in an operating state. And the operating environment conditions of the gas alarm device main body 10A according to the sensor element 56B related to the attached gas sensor 55 based on the information specific to the sensor element 56B recorded in the memory of the sensor substrate 57 related to the gas sensor 55. The temperature compensation condition is automatically set according to the temperature information from the thermistor.
In this state, air in the environmental atmosphere reaches the sensor main body 56 by natural diffusion, the concentration of the target detection target gas is detected, and the result is displayed on the panel display mechanism 47.

The concentration of the gas detected by the sensor body 56 is sent as a current signal or a voltage signal to the signal processing circuit of the CPU board 46C for processing, whereby the concentration of the detection target gas is set to a reference value (set for the gas). When the alarm point is exceeded, an alarm operation signal is issued, whereby the alarm light-emitting unit 52 is driven to generate an alarm by light emission.
When performing concentration detection for different types of gases, the gas sensor 55 may be replaced and the same operation may be repeated. To replace the gas sensor 55, the grip member 65 is held and rotated counterclockwise to release the lock by the engagement mounting portion 17 of the sleeve member 16, the gas sensor 55 is pulled downward, and another gas sensor is mounted on the sensor. A state in which a gas detection operation can be performed by automatically setting the operating environment condition and the temperature compensation condition of the gas alarm device main body 10A on the basis of the information unique to the sensor element related to the gas sensor by being attached to the unit 15 It is said.

  In practice, the gas alarm device 10 is used by being carried by an operator, for example, by being held in the hand of the operator, but the environment atmosphere in which the operator is present has a high concentration of dangerous gas, or When the oxygen gas concentration is low and the state becomes dangerous, the fact is notified by the display on the display unit 51 and the light emission from the alarm light-emitting unit 52. Measures can be taken, or measures such as evacuation from the spot can be taken.

  Thus, according to the gas alarm device 10, basically, the casing 11 is of a size that can be held and held in the hand, and the upper half of the casing 11 is necessary for gas detection. In addition, the battery chamber 13 and the sensor mounting portion 15 are formed in parallel in the lower half, and all the necessary components are rationally arranged in the casing 11. Since the gas sensor 55 in which the sensor main body 56 and the specific adapter 60 are configured as one structure is mostly mounted in the sensor mounting portion 15 of the gas alarm main body 10A, the gas alarm 10 Since the grip member 65 of the adapter 60 constituting the gas sensor 55 is exposed to the outside, the gas sensor 55 can be configured as a small one. Can be detachable to the easy, therefore, it is possible to obtain an excellent portability and high convenience.

  Further, since the grip member 65 is made of an elastic body and has a projecting edge portion 66, the grip member 65 itself functions as an impact absorbing material (buffer material) of the sensor body 56. It is possible to prevent 56 from being broken or damaged.

  Further, since an O-ring 67 made of neoprene coated with fluororesin is mounted between the inner peripheral surface of the holder member 61 and the outer peripheral surface of the sensor body 56, high airtightness can be obtained. The test gas can be reliably introduced into the sensor body 56. The calibration gas supply head 95 for supplying the calibration gas for the sensor main body 56 attached to the gas alarm device main body 10A is configured to be attachable to the protruding portion 66 of the grip member 65. Thus, the calibration work can be performed with the gas sensor 55 attached to the gas alarm device main body 10A, so that high convenience can be obtained.

  Furthermore, in the gas alarm device 10, as the gas sensor 55 is attached, the operating environment conditions and temperature compensation conditions of the gas alarm device body 10 </ b> A are automatically changed to those corresponding to the attached gas sensor 55. Therefore, it is not necessary to perform complicated operations and high convenience can be obtained.

  In the gas alarm device, (1) the casing 11 is connected to the front casing member 20 and the rear casing member 12 via a ring-shaped packing 25 disposed over the entire circumference of the contact surface 26. (2) the ring-shaped packing 68 is interposed between the inner surface of the sensor mounting portion 15 of the gas alarm device body 10A and the outer surface of the holder member 61 associated with the gas sensor structure 55; and (3) the battery lid 30. Since a sufficiently reliable waterproof structure is formed by mounting the ring-shaped packing on the side of the water, it is possible to reliably prevent water from entering the gas alarm device main body 10A from the outside. For example, the gas alarm device main body 10A is extremely useful for detecting gas in an environment where water may enter from the outside.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to said embodiment, A various change can be added.
For example, the method of using the gas alarm is not limited to the method of holding and holding the gas alarm by hand, and the gas alarm can be used by being attached to the body with an appropriate attachment.
For example, as shown in FIG. 21, a sensor mounting portion 82 having the same configuration as the sensor mounting portion 15 of the gas alarm device main body 10A is provided at one end and the sensor mounting portion 15 of the gas alarm device main body 10A is mounted at the other end. Using a remote cable 80 having a mounted portion 85, for example, a length of 0.5 to 20 m, the gas inlet 56A associated with the gas sensor 55 is arbitrarily held by gripping only the distal end portion to which the gas sensor 55 is mounted. The gas alarm device main body 10A is held by hand or attached to the body, and the tip end portion to which the gas sensor 55 is attached is inserted into a manhole, for example. it can.

Furthermore, in the gas alarm device of the present invention, it may be used by directly attaching to a person's body using an appropriate attachment member or attaching to a person's clothes. A clip, a pin, etc. can be mentioned.
In addition, as an alarm notification mechanism in a gas alarm device, for example, an alarm buzzer and an alarm vibration generator (which emits a low frequency of about several tens of hertz) can be provided. In addition to light emission by the light emitting unit, an alarm is generated by a buzzer sound by an alarm buzzer and vibration by an alarm vibration generator.

It is a front view which shows the example of 1 structure of the portable gas alarm device of this invention. It is a top view of the portable gas alarm device shown in FIG. FIG. 2 is a rear view of the portable gas alarm device shown in FIG. 1. FIG. 2 is a bottom view of the portable gas alarm device shown in FIG. 1. It is a left view of the portable type gas alarm device shown in FIG. It is a right view of the portable gas alarm device shown in FIG. It is a longitudinal cross-sectional view in AA of FIG. It is a cross-sectional view in BB of FIG. It is a longitudinal cross-sectional view in CC of FIG. It is a cross-sectional view in DD of FIG. It is a front view of a back side casing member. It is a rear view of a front casing member. It is explanatory drawing which shows the outline of a structure in an example of a gas sensor structure. FIG. 14 is an exploded view of the gas sensor structure shown in FIG. 13. It is explanatory drawing which shows the structure of the holder member which comprises an adapter, Comprising: (A) Side view, (B) It is sectional drawing in aa of (A). It is explanatory drawing which shows the structure of the grip member which comprises an adapter, Comprising: (A) Front view, (B) It is sectional drawing in bb of (A). It is explanatory drawing which shows one structural example of the calibration gas supply head used for the portable gas alarm device of this invention, Comprising: (A) Front view, (B) Rear view, (C) cc of (A) FIG. It is a perspective view which shows the structure of a protect cover. It is explanatory drawing which shows the structure of the sleeve member in a gas alarm device main body, Comprising: It is sectional drawing in dd of (A) front view, (B) side view, (C) (A). It is explanatory drawing which shows the state with which the gas sensor structure was mounted | worn with the sleeve member. It is a perspective view for explanation which shows the state where the remote cable was connected to the gas alarm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Portable type gas alarm device 10A Gas alarm device main body 11 Casing 11A Fixing screw 12 Back side casing member 13 Battery chamber 13A Battery receiving part 13B Battery insertion port 13C Notch part 14 Battery 15 Sensor mounting part 15A Sensor mounting port 16 Sleeve member DESCRIPTION OF SYMBOLS 17 Engagement mounting part 17A Notch part 17B Guide groove 17C Opening part 18 Connection connector member 19 Visual opening part 20 Front side casing member 21 Front opening part 22 Opening part for operation part formation 23 Reinforcement member 25 Ring-shaped packing 26 Pair Contact surface 28 Infrared communication port 30 Battery cover 45 Power supply terminal 46A Display board 46B Power supply board 46C CPU board 47 Panel-like display mechanism 48 Light emitting element for alarm 49A, 49B, 49C Switch element 50 Protection window member 51 Display section 52 For alarm Light emitting part 3 Operation Unit 53A First Operation Button 53B Second Operation Button 53C Third Operation Button 54A, 54B, 54C Switch Drive Port 55 Gas Sensor 56 Sensor Body 56A Gas Inlet 56B Sensor Element 56C Sensor Case 56D External Lead Member 57 Sensor board 57A Connector part 58 Sensor protection cover member 59 Cap member 60 Adapter 61 Holder member 62 Grip fitting part 62A Fitting protrusion 63 Flange part 64 Engaging protrusion 65 Grip member 65A Fitting hole 66 Protruding edge part 66A For mounting Space portion 67 O-ring 68 Ring-shaped packing 70 Protect cover 71 Mounting portion 72 Front opening 73 Gas alarm mounting opening 74 Gas sensor mounting opening 75 Battery insertion opening 76 Infrared communication port exposure opening 80 remote cable 82 sensor mounting portion 85 to be mounted 96 main body portion 95 the calibration gas supply head 96A mating portion 97A, 97B gas passage 98 connecting pipe member 99 recess

Claims (7)

A box-shaped casing that can be held and held by hand is provided, a functional member for gas detection operation is arranged in the upper half inside the casing, and a battery chamber and a sensor mounting part are arranged in the lower half It is equipped with a gas alarm body formed side by side,
A sensor body having a columnar shape as a whole, and a cylindrical holder member that holds the sensor body inside and an adapter made of a cylindrical grip member made of an elastic body provided at the tip of the holder member have one structure. A portable gas alarm device, wherein a gas sensor configured as a body is detachably mounted on a sensor mounting portion of a gas alarm device body via a ring-shaped packing provided on an outer peripheral surface of a holder member. The portable gas alarm device according to claim 1, wherein the grip member has an axial length of 13 to 20 mm.   The portable member according to claim 1 or 2, wherein a seal member made of fluororesin-coated neoprene is mounted between the inner peripheral surface of the holder member and the outer peripheral surface of the sensor body. Gas alarm.   4. The grip member according to claim 1, wherein the grip member has a protruding edge portion that protrudes outward from the outer end of the sensor main body in a state where the sensor main body is held inside the holder. 5. Portable gas alarm.   A calibration gas supply head for supplying a calibration gas for a sensor body related to a gas sensor mounted on a gas alarm body is configured to be mountable on a protruding edge portion of a grip member. The portable gas alarm device according to claim 4. The sensor mounting part in the main body of the gas alarm is replaced with one of the other gas sensors, which is selected according to the purpose from a plurality of identical gas sensors with different sensor bodies. Configured to be possible,
The portable gas alarm device according to any one of claims 1 to 5, wherein the sensor main body includes storage means in which information unique to the sensor main body is recorded.   The sensor main body has a temperature detection means, and temperature compensation conditions for a gas detection signal from the sensor main body are set based on temperature information detected by the temperature detection means. Portable gas alarm.