JP2010092164A - Gas alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy to install and remove compact gas alarm with high operability, requiring small footprint. <P>SOLUTION: In a gas alarm having a back face fixed to a vertical mounted face, a pump mounting part and a gas sensor unit mounting part are formed adjacent to each other in a front side region of an outer housing, the gas sensor unit mounting part being formed so that a pump fixing cover body for opening and closing the pump mounting part is closed. A front cover lid for opening and closing the gas sensor unit mounting part is installed rotatably with a pivotal support axis extending in the width direction supported by the outer housing. A gas sensor unit housing the pump, the gas sensor and a sensor substrate in the sensor case is mounted so as to be detachable on each mounting part. A cover lid for pump fixation is provided with an inclined section extending toward the front upper part. The sensor case fits to the gas sensor unit mounting part including a section formed by the inclined section. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fixed wall-type gas alarm device that is fixed to a wall surface that defines a target space for gas detection, for example.

  For example, in a semiconductor device or liquid crystal device manufacturing factory, or various chemical factories, etc., when a specific hazardous gas is contained in a high concentration in the environmental atmosphere, for example, when it becomes dangerous to workers, A gas alarm device is used to warn that. As the gas alarm device, a fixed wall type is widely used, and various types of dangerous gas can be obtained by arranging a large number of them fixed on the wall surface in a state of being arranged in the horizontal direction. It is done to detect.

  Some types of such wall-fixed gas alarm devices, for example, fix a mounting plate provided with a pair of elastic arm portions engaged with recesses formed on both side surfaces of the gas alarm device main body to the wall surface. The gas alarm device main body is engaged with the elastic arm portion by pushing the elastic arm portion of the mounting plate outward in the width direction by the gas alarm device main body and inserting the gas alarm device main body between the elastic arm portions. It is set as the structure fixed to a wall surface (for example, refer patent document 1).

JP-A-10-105854

As described above, the wall-fixed type gas alarm device is installed and used in a state in which a large number of gas alarm devices are arranged in the horizontal direction, and therefore it is desired that the installation occupation area is small. In fact, it is impossible to secure a sufficiently large working space, and there is a problem that it is difficult to carry out maintenance work in a state where the gas alarm device is fixed to the mounting surface. .
In addition, for example, when performing maintenance, when it is necessary to remove the gas alarm device body from the mounting plate, an engagement portion with the mounting plate is formed on the side surface portion of the gas alarm device. There is a problem that it is difficult to release the engagement between the main body of the gas alarm device and the mounting plate, and the workability is lowered.

  The present invention has been made on the basis of the circumstances as described above, and can be easily installed and removed from the surface to be attached to obtain high workability, and is small in size. An object of the present invention is to provide a gas alarm device that requires a small installation area.

The gas alarm device of the present invention is configured such that the rear back surface is fixed to a vertical mounting surface,
A substantially rectangular parallelepiped outer casing,
A pump unit in which a movable body provided with a magnet is fixed to a rubber diaphragm and is detachably mounted in a pump mounting portion formed in a front side region in the outer casing and an electromagnet for driving the movable body. An electromagnetically driven pump;
A pump fixing lid that opens and closes the pump mounting portion, wherein the portion corresponding to the magnet in the movable body is inclined and extended toward the front upper side,
A gas sensor unit that is detachably mounted on a gas sensor mounting portion formed at a front position of the pump mounting portion by closing the pump fixing lid;
It has a pivot shaft extending in the width direction, and the pivot shaft is supported by the support portion at the lower end position of the front edge of the outer casing, and is closed and opened by the front cover lid lock mechanism. A front cover lid for opening and closing the gas sensor mounting portion, which is provided so as to be rotatable between the open position and the open position,
The gas sensor unit is configured such that a gas sensor and a sensor substrate for processing an output signal of the gas sensor are accommodated in a sensor case corresponding to the type of the gas sensor, and the sensor case is formed by an inclined portion of a pump fixing lid. It has a form suitable for the gas sensor mounting part including the part to be defined.

  In the gas alarm device according to the present invention, the rear back surface is locked to the locking portion of the fixing mounting member and the lower surface by sliding downward with respect to the fixing mounting member fixed to the vertical mounting surface. The part is preferably configured to be detachably mounted by being engaged with a lock member provided on the fixing mounting member.

  Furthermore, in the gas alarm device according to the present invention, the outer casing is substantially flat without projecting outward on both sides, and all the components including the fixing mounting member are within the width range of the outer casing. It is preferable that it is comprised so that it may be in the state accommodated in.

  Furthermore, it is preferable that the gas alarm device according to the present invention is installed and used in a state where a large number of gas sensors of different types are mounted in the width direction.

  According to the gas alarm device of the present invention, the pump and the gas sensor are arranged from the front side in order from the one with the highest replacement frequency in the front side region in the outer casing exposed to the outside when the front cover lid is opened. Since the gas sensor unit including the pump and the gas sensor is rationally arranged by effectively using the space in the outer casing, the gas alarm device can be obtained. It can be configured as a small one.

  When the gas alarm device can be mounted and fixed by sliding downward in a state aligned with the fixing mounting member fixed to the surface to be attached, and when removing the gas alarm device from the fixing mounting member, Since it is configured so that the engagement with the lock member can be released by accessing the lock member from the front side of the gas alarm device using the piping space formed below the gas alarm device. The installation and removal work of the gas alarm device can be easily performed and high workability can be obtained. For example, when a large number of gas alarm devices are arranged in the width direction, adjacent gas alarm devices Since there is no need to secure a space between them, the installation occupation area can be reduced.

  Furthermore, since all of the constituent members including the mounting member for fixing are in a state of being accommodated in the width region of the outer casing, in the case of arranging a large number of units in parallel, between adjacent gas alarm devices Since the space can be made as small as possible, for example, a large number of gas alarm devices can be installed in close contact with each other, the installation occupation area can be further reduced.

1 is a front view showing the configuration of an example of the gas alarm device of the present invention, FIG. 2 is a top view of the gas alarm device shown in FIG. 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 5 is a perspective view showing the configuration of the gas alarm device main body, and FIG. 5 is a perspective view showing the configuration of the inner casing member together with the pump unit.
This gas alarm device has a display unit 68 and an operation unit 69 on the front side and a gas pipe connection unit 29 on the lower surface, and the rear rear surface defines a gas detection target space of a factory and other buildings, for example. A fixing mounting member 80 fixed to a vertical mounting surface and fixed to the mounting surface; and a gas alarm device main body 10 detachably mounted on the fixing mounting member 80; It is comprised by.

  The gas alarm device main body 10 includes a flat (longitudinal) rectangular parallelepiped outer casing 20 formed by a base member 11 and a cover member 17 fixed by screwing to the base member 11. An inner casing member 25 made of an integral resin molded product fixed on the base member 11 and a movable body 42 having a magnet 43 fixed to a rubber diaphragm 41 and the movable body 42 are magnetized. In the position between the electromagnetically driven pump composed of the electromagnet 48 that reciprocates the diaphragm 41 by swinging it using a mechanical action, and the position between the one side wall of the outer casing 20 and the inner casing member 25, along the side wall. The main board 14 (see, for example, FIG. 8) arranged to extend in the front-rear direction, and the front formed in the front region in the outer casing 20 A front cover lid 60 that opens and closes a gas sensor mounting portion formed of a recess to be opened, and the sensor case 71 corresponding to the type of the gas sensor 72 together with the sensor substrate 73 that processes the output signal of the gas sensor 72. The gas sensor unit 70 is unitized by being housed in the gas sensor unit 70 and is detachably mounted on a gas sensor mounting portion (hereinafter referred to as “gas sensor unit mounting portion”) 16 (see FIG. 8).

The base member 11 has a substantially flat bottom surface portion 12 and a back surface portion 13 extending upward from the rear edge of the bottom surface portion 12. The back surface portion 13 has an engagement opening 13 </ b> A for the fixing mounting member 80. Is formed.
At the front edge portion of the base member 11, support portions 15 that rotatably support the pivot shaft 61 </ b> A of the front cover lid 60 are formed at the center portion and both end portions in the width direction.

The cover member 17 is composed of a top plate 17A and a side plate 17B extending downward from both side edges of the top plate 17A. The cover member 17 has a substantially U-shaped cross section, and the side plate 17B projects outward. There is no flatness.
On the front edge side portion of the top plate 17 </ b> A in the cover member 17, a lock release portion 18 that releases the lock by the lock mechanism that fixes the front cover lid 60 in the closed state is formed. The unlocking portion 18 is configured by two button portions 18A formed by cutting out a part of the top plate 17A in a single piece so as to be elastically deformed when pressed from above. ing.
In addition, a locking hole 19 for the fixing mounting member 80 is formed at a lower position on the rear rear surface of each side plate 17B.

The inner casing member 25 is made of an integral resin molded product, and includes a gas flow path through which the test gas flows, including a gas introduction part 29A for introducing the test gas and a gas discharge part 29B for discharging the test gas, and The pump mounting part, the gas sensor connection part, and all the mounting parts for the component parts into which other test gas is introduced are formed.
That is, at the upper position on the front surface of the inner casing member 25, it is composed of a recess opening upward and forward where the pump unit 40 is accommodated, and the pump unit connection portion 26 </ b> A is formed on the inner surface of the rear wall that defines the recess. A pump unit mounting portion (pump mounting portion) 26 is formed, and a gas sensor connection portion 28 is formed at a position aligned below the pump unit mounting portion 26. A gas flow path extending from the gas introduction part 29A through the buffer space part 25A to the pump unit connection part 26A, and a flow rate sensor 78 provided detachably on the rear rear surface of the inner casing member 25 from the pump unit connection part 26A. A gas flow path extending from the gas sensor connection section 28 to the gas discharge section 29B is formed.
The gas introduction part 29A and the gas discharge part 29B are inserted into a through hole formed in the base member 11 and protrude downward, so that the gas pipe connection part is formed on the lower surface of the gas alarm device body 10. 29 is formed.

A chassis 50 made of sheet metal is fixed to the upper surface of the inner casing member 25. The chassis 50 has a substantially plate-like top surface portion 51 and a plate-like back surface portion 53 extending downward from the rear edge of the top surface portion 51. And two engagement holes 52 for fixing the front cover lid 60 to the closed state by engagement at positions corresponding to the lock release button portions 18A of the cover member 17 in the top surface portion 51. Is formed.
The back surface portion 53 has a form in which a lower half portion thereof is bent forward and extends in a substantially “L” shape, and is attached to the fixing member at a position aligned in the width direction at the corner portion of the bent portion. Two locking holes 54 for 80 are formed, and a connecting connector 55 is provided on the outer surface of the plate-like portion extending downward.

A pump fixing lid 30 that opens and closes the pump unit mounting portion 26 is fixed in a closed state by the pump fixing lid locking mechanism at a position below the front opening edge of the pump unit mounting portion 26 in the inner casing member 25. It is provided so as to be rotatable between a closed position and an open position in which the fixing by the pump fixing lid locking mechanism is released and opened.
The pump fixing lid 30 includes a vertical portion 31 that fixes the pump unit 40 in a pressed state, an inclined portion 32 that extends upward in a state where the pump unit 40 is continuously inclined to the vertical portion 31, and the inclined portion 32. A finger hooking portion 33 extending upward in a state of being inclined rearward, and a tip end portion 34 extending upward continuously from the finger hooking portion 33. An engaging claw portion 34A that is engaged with an engaged portion 51A formed on the chassis 50 and that constitutes the lid locking mechanism is formed.

  The front cover lid 60 has a bearing portion 61B provided so as to protrude rearward at both ends of the lower edge portion, and a lid having a pivot shaft 61A extending in the width direction with both ends fixed to the bearing portion 61B. 61, a display / operation circuit board 62 provided with electronic components including display elements and operation buttons provided inside the lid 61, and the display / operation circuit board 62 are covered. The display / operation circuit board 62 has, for example, a flat cable 64 (see FIG. 7). Thus, the gas alarm device main body 10 is electrically connected to the main board 14, and the pivot shaft 61 </ b> A is supported by the support portion 15 formed on the front edge portion of the base member 11. It is provided rotatably between an open position that is a closed position and an open position that is fixed in the closed state by the mechanism.

  The front cover lid locking mechanism includes two engaging claws 65 that are provided in the upper edge portion of the front cover lid 60 so as to be spaced apart from each other in the width direction. It is a double lock mechanism in which the front cover lid 60 is fixed in a closed state by being engaged with each of the combination holes 52, and the two buttons 18 </ b> A formed on the cover member 17 allow the front cover lid 60 to be closed. By releasing the engagement between the engaging claw portion 65 and each of the engagement holes 52 of the chassis 50, the front cover lid 60 can be rotated.

  In addition, the front cover lid 60 is formed with a viewing opening 67 for visually recognizing a nameplate 70A indicating information such as the type of the gas sensor related to the mounted gas sensor unit 70 in the closed state. Has been.

Thus, in this gas alarm device, as shown in FIG. 6, the pump unit 40 is inserted into the outer casing 20 from the front side when the pump fixing lid 30 is in the open state, and the pump unit A position regulating rail portion 44 formed to extend in the front-rear direction on the side surface portion 40 is guided along the guide member 26B in the pump unit mounting portion 26, and is accommodated in the pump unit mounting portion 26 as shown in FIG. Arranged. In this state, when the pump fixing lid 30 is closed, the point-like cushion members 27A provided at the four corners on the inner surface of the rear wall of the pump unit mounting portion 26, and the pump fixing lid 30 are provided. A gas suction portion formed on the rear back surface of the pump unit 40 by being pressed through two cushion members 27B provided on the inner surface of the upright portion 31 at locations in contact with both side portions of the front surface of the pump unit 40; The head portion 45 having the gas discharge portion is set in the pump unit connection portion 26A.
On the other hand, when the replacement operation of the pump unit 40 is performed, the pump unit 40 is not mechanically fixed to the inner casing member 25, so that the engagement of the pump fixing lid 30 with the chassis 50 is released. In this state, the pump unit 40 can be removed by simply pulling it out in a state where the locked state is released and the pump fixing lid 30 is opened.

  In general, in a gas alarm device, both the pump device and the gas sensor 72 are normally required to be replaced at a frequency of, for example, once a year with the use of the gas alarm device. In this gas alarm device, in a state where the gas sensor 72 whose maintenance including replacement is performed is higher than the pump device is located on the front side, that is, in a state where the pump unit 40 is accommodated in the pump unit mounting portion 26. By closing the pump fixing lid 30, as shown in FIG. 8, the gas sensor unit mounting portion 16 including a recess opening forward is formed at the front position of the pump unit mounting portion 26. As described above, the gas sensor 72 is unitized and is detachably mounted on the gas sensor unit mounting portion 16.

  As the sensor case 71 constituting the gas sensor unit 70, one according to the type of the gas sensor 72 (the type of the detection target gas or the detection level is different) is used, but the outer shapes are substantially the same. That is, it has an outer shape compatible with the gas sensor unit mounting portion 16 including the portion defined by the inclined portion 32 in the pump fixing lid 30. Therefore, in this gas alarm device, the objects to be detected are mutually detected. A gas sensor unit selected according to the purpose from among a plurality of gas sensor units each having a gas sensor 72 having a different gas type or detection level, and a gas sensor of a different type from the gas sensor according to the gas sensor unit. The gas sensor unit can be exchangeably mounted.

  Examples of the gas sensor 72 include a constant potential electrolytic sensor, a thermal particleization sensor, a galvanic cell sensor, a contact combustion sensor, and a semiconductor sensor.

The gas sensor unit 70 is inserted from the front side (front side) with respect to the gas sensor unit mounting portion 16 in a state where the front cover lid 60 is opened (FIG. 8). As shown in FIG. The gas sensor unit mounting portion 16 is housed and arranged in a state of being electrically connected to the connection connector portion 16 </ b> A in the main body 10. When the front cover lid 60 is closed, the entire gas sensor unit 70 is pressed through the resilient member 63A provided on the inner surface of the front cover lid 60 and set in the gas sensor connection portion 28. It is said.
On the other hand, for example, when the gas sensor 72 is replaced, the gas sensor unit 70 is not mechanically fixed to the inner casing member 25 or the outer casing 20, so that the front cover lid 60 is engaged with the outer casing 20. Can be removed by simply pulling out the gas sensor unit 70 in a state where the locked state is released and the front cover lid 60 is opened.

  The connector part 16A for connection in the gas alarm device main body 10 is provided with a slight play, so that the gas sensor 72 is securely connected to the gas sensor connection part 28 in a state where high gas tightness is obtained. In addition, it is possible to reduce the load on the connector part 16A for connection that acts during the connection work of the gas sensor unit 70, and reliably prevent a connection failure or failure.

  The gas alarm device main body 10 is provided with an operation state confirmation light emitting means 14A that is exposed when the front cover lid 60 is opened. For example, when the gas sensor unit 70 is in an operation state, the front surface is covered. The operator is notified by light emission when the cover lid 60 is opened.

In this gas alarm device, as described above, the gas alarm device main body 10 is attached to the fixing mounting member 80 fixed to a vertical mounting surface such as a wall surface defining a gas detection target space of a factory and other buildings, for example. Used detachably.
As shown in FIG. 10, the fixing mounting member 80 has a substantially plate-like vertical portion 82 fixed to the surface to be attached and a plate-like horizontal portion 87 extending forward from the lower edge of the vertical portion 82. The fixed board (wall-hanging angle) 81 and a lock member 90 that is detachably mounted on the horizontal portion 87 of the fixed board 81 are configured.

  The vertical portion 82 of the fixed substrate 81 has a bent portion 82A in which a substantially central portion in the vertical direction is deformed so that a cross-sectional shape becomes a substantially “U” shape inward, and the bent portion 82A. At a position where two upper locking portions 83 each formed of a claw-like projection 83A in which a part of the suspending portion 82 is cut out in a single piece are aligned in the width direction at a substantially central position in the width direction in the upper side portion, Two downward locking portions 84 made up of claw-like projections 84A facing upward are formed inward on both side edges of the lower portion of the bent portion 82A. It is formed in a state protruding to the side. Reference numeral 85 in FIG. 10 denotes an opening for mounting, for example, a fixing screw on the surface to be attached, 86 denotes a connector for electrical connection with the gas alarm device body 10, and 88 denotes an opening for drawing in the power cable. Part.

  The dimensions in the vertical direction of the claw-like projections 83A constituting the upper locking portion 83 and the claw-like projections 84A constituting the lower locking portion 84 in the fixed substrate 81 are both 7 to 8 mm, for example. Thereby, the gas alarm device main body when the gas alarm device main body 10 is mounted while limiting the sliding amount in the vertical direction required when removing the gas alarm device main body 10 from the fixing mounting member 80 as small as possible. Thus, it is possible to obtain a state in which the movement of 10 in the front-rear direction is reliably prohibited.

The lock member 90 includes a main body 91 having an arcuately curved shape so as to protrude upward, a lever portion 93 extending downward continuously from the lower end of the front side plate-like portion of the main body 91, and the main body 91. And a mounting portion 95 continuous with the lower end of the back side plate-like portion.
In the main body 91, an engaging claw portion 92 that is engaged with an engaging opening 13 </ b> A formed in the base member 11 of the gas alarm device main body 10 is formed on the front surface of the front side plate-like portion. A locking portion 94 having a notch locked to the upper surface of the horizontal portion 87 is formed on the outer surface of the back side plate-like portion.

Hereinafter, a method for attaching and detaching the gas alarm device main body 10 to / from the fixing mounting member 80 will be described.
Since the fixing mounting member 80 has a size that fits within the width region of the outer casing 20 in the gas alarm device main body 10, the horizontal portion 87 of the fixed substrate 81 in the fixing mounting member 80 fixed to the mounting surface. The gas alarm device main body 10 is moved rearwardly along the line to automatically obtain a state where the gas alarm device main body 10 is aligned at an appropriate position with respect to the mounting member 80 for fixing. By sliding, the upper locking portion 83 of the fixing mounting member 80 is locked to the locking hole 54 of the chassis 50 in the gas alarm device main body 10 and the lower locking portion 84 of the fixing mounting member 80 is locked. The gas alarm device main body 10 is locked in the locking hole 19 of the cover member 17. On the other hand, in a state where the gas alarm device main body 10 is aligned with the mounting member 80 for fixation (FIG. 11 (A)), the gas alarm device main body 10 is slid downward, so that FIG. As shown, the lock member 90 is elastically deformed by the base member 11 of the gas alarm device main body 10 and is further slid downward, whereby the shape of the lock member 90 is restored and the engaging claw portion 92 of the lock member 90 is restored. Is engaged with the engaging opening 13A of the base member 11 in the gas alarm device main body 10, so that the gas alarm device main body 10 is mounted on and fixed to the fixing mounting member 80 in a state where movement in the vertical direction is prohibited. (FIG. 11C).
In a state where the gas alarm device main body 10 is mounted on the fixing mounting member 80, all the constituent members including the fixing mounting member 80 are stored in the width region of the outer casing 20.

  On the other hand, when removing the gas alarm device main body 10 from the mounting member 80 for fixing, the lock member 90 is elastically pressed by pushing the lever portion 93 of the lock member 90 backward using, for example, a screwdriver or the like as necessary. (FIG. 11 (b)), thereby disengaging the engagement claw portion 92 of the lock member 90 and the engagement opening 13A in the base member 11 of the gas alarm device main body 10 to release the gas alarm device main body. 10 is released from the locked state with respect to the fixing mounting member 80, and then the gas alarm device main body 10 and the mounting member 80 for fixing are released by sliding the gas alarm device main body 10 upward, The gas alarm device main body 10 can be removed.

For example, the gas alarm device can be configured to install an environmental monitoring system by arranging a plurality of gas sensor units 70 each having a different type of gas sensor and having the same configuration arranged in the width direction. Can be built and used.
In such an environmental monitoring system, the size of the space in the width direction between the adjacent gas alarm devices can be, for example, 10 mm or less, or can be substantially 0 mm.

Thus, according to the above gas alarm device, in the front side region in the outer casing 20 exposed to the outside when the front cover lid 60 is opened, that is, in the space on the front side of the inner casing member 25. Since the pump unit 40 and the gas sensor 72 are arranged side by side from the front side in descending order of replacement frequency, high maintainability can be obtained.
Moreover, the pump unit 40 and the gas sensor unit 70 are rationally arranged by effectively using the space on the front side of the inner casing member 25 in the outer casing 20, that is, the pump fixing lid 30 is used as the pump unit. A configuration that can be fixed so as to obtain the desired airtightness but does not hinder the operation of the movable body 42. Specifically, the vertical portion 31 and the inclined portion 32 that is continuous with the vertical portion 31 are provided. The sensor case 71 constituting the gas sensor unit 70 has a form suitable for the gas sensor mounting portion 16 including the portion defined by the inclined portion 32 of the pump fixing lid 30, thereby enabling compactness. Since it is arranged, the gas alarm device itself can be miniaturized.

  In addition, the gas alarm device main body 10 is slid downward in a state where the gas alarm device main body 10 is aligned with the fixing mounting member 80 fixed to the surface to be attached, whereby the upper locking portion 83 of the fixing mounting member 80 is moved. The lower locking portion 84 of the fixing mounting member 80 is locked to the locking hole 19 of the cover member 17 in the gas alarm device body 10, and the lock 50 is further locked. The engaging claw portion 92 of the member 90 is engaged with the engaging opening 13 </ b> A of the base member 11 in the gas alarm device main body 10, whereby the gas alarm device main body 10 can be mounted and fixed to the fixing mounting member 80. In addition, when removing the gas alarm device main body 10 from the fixing mounting member 80, a piping space formed below the gas alarm device is used. Since the lock member 90 can be accessed from the front side of the gas alarm device and the engagement between the gas alarm device main body 10 and the lock member 90 can be released, installation work and removal of the gas alarm device Work can be easily performed and high workability can be obtained. Moreover, for example, when multiple units are arranged in the width direction, a space between adjacent gas alarm devices is secured. Since it is not necessary, the installation area can be reduced.

  Furthermore, when all of the constituent members including the fixing mounting member 80 are accommodated in the width region of the outer casing 20, the adjacent gas alarm device can be used in the case where a large number of units are arranged in parallel. Since the space between them can be made as small as possible, for example, a large number of gas alarm devices can be installed in close contact with each other, the installation occupation area can be further reduced.

  Furthermore, according to the gas alarm device having the above configuration, the following effects can be obtained.

(1) Since the front cover lid 60 is configured to open downward, the movable range (direction) of the front cover lid 60 matches the access direction (front direction) when the gas alarm device body 10 is installed / removed. In other words, since the working space is secured, the opening / closing operation of the front cover lid 60 is not hindered and can be reliably rotated between the closed position and the open position. Therefore, in a state where the front cover lid 60 is in the predetermined open position (see FIG. 9), the intended work can be performed and high workability can be obtained.

(2) The gas sensor unit 70 and the pump unit 40 can be attached and detached by opening and closing the front cover lid 60 without removing the gas alarm device main body 10 from the fixing mounting member 80 (attached surface). Maintenance work including replacement of the gas sensor 72 can be easily performed, and the sensor case 71 constituting the gas sensor unit 70 has a shape suitable for the gas sensor unit mounting portion 16, so that the gas sensor unit 70 is attached to the gas sensor unit mounting portion. The gas sensor unit 70 is accommodated in the gas sensor unit mounting portion 16 in a state where the gas sensor unit 70 is regulated to an appropriate position by simply inserting the gas sensor unit 16, and the gas sensor unit 70 is closed by closing the front cover lid 60 in this state. On the inner surface of the front cover lid 60 By being configured to be pressed through the elastic member 63A and set in the gas sensor connection portion 28, the gas sensor unit 70 can be reliably and easily maintained in a state where high airtightness is ensured. It is possible to obtain a high workability in implementation of installation work and maintenance work of the gas alarm device.

(3) The front cover lid 60 is opened because the front cover lid 60 is provided with a visual recognition opening 67 that allows the nameplate of the gas sensor 72 mounted on the gas alarm device body 10 to be visually recognized from the outside. Since it is possible to easily check the type of the gas sensor 72 that is mounted without setting the state, for example, a large number of gas sensors 72 having different types of detection target gases or different detection levels are mounted side by side. In such a case, it is possible to easily identify a gas alarm device that requires maintenance work, identify a type of gas sensor to be mounted, and the like, and obtain high workability.

(4) A configuration in which one selected from a plurality of gas sensor units 70 having various types of gas sensors 72 with respect to the gas alarm device main body 10 according to the purpose can be mounted in a replaceable manner. Thus, various types of gas components can be detected by one common gas alarm device, so that it can be configured to be multifunctional, and the gas alarm device main body 10 The main board 14 in FIG. 5 has a signal processing system common to all the gas sensor units 70, and the sensor board 73 in the gas sensor unit 70 has a function of creating measurement data of a unified standard, so that a gas alarm is provided. The state in which the target gas component can be detected without changing the setting of the apparatus body 10 is Only attaching the capacitors unit 70, it can be obtained, can be easily mounted gas sensor unit 70 which is selected according to the purpose.

  As described above, in the fixed wall type gas alarm device, it is actually difficult to secure a sufficiently large working space. However, according to the gas alarm device configured as described above, the gas sensor unit 70 and the pump unit are provided. 40 can be easily set by a simple operation, and the apparatus itself is configured as a small one, which makes it extremely useful as a fixed wall type.

As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment, A various change can be added.
For example, as long as the gas sensor and the pump are arranged in order from the front side, the specific configuration such as the arrangement position of other components is not particularly limited.

It is a front view which shows the structure in an example of the gas alarm apparatus of this invention. It is a top view of the gas alarm device shown in FIG. It is the sectional view on the AA line in FIG. It is a perspective view which shows the structure of a gas alarm device main body. It is a perspective view which shows the structure of an inner casing member with a pump unit. It is a perspective view which shows the state from which the pump unit of the gas alarm device shown in FIG. 1 was removed. It is a front view which shows the state by which the pump unit of the gas alarm device shown in FIG. 1 was accommodated in the pump unit mounting part. It is a perspective view which shows the state from which the gas sensor unit of the gas alarm device shown in FIG. 1 was removed. It is a front view which shows the state by which the gas sensor unit shown in FIG. 1 accommodated the gas sensor unit in the gas sensor unit mounting part. It is a perspective view which shows the structure of the mounting member for fixation. It is an expanded sectional view for demonstrating the mounting method with respect to the mounting member for fixation of a gas alarm device main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gas alarm apparatus main body 11 Base member 12 Bottom surface part 13 Back surface part 13A Engagement opening part 14 Main board | substrate 14A Light emission means for operation state confirmation 15 Support part 16 Gas sensor unit mounting part 16A Connection connector part 17 Cover member 17A Top plate 17B side Face plate 18 Unlocking part 18A Button part 19 Locking hole 20 Outer flange 25 Internal casing member 25A Buffer space part 26 Pump unit mounting part 26A Pump unit connection part 26B Guide member 27A, 27B Cushion member 28 Gas sensor connection part 29 Gas piping Connection portion 29A Gas introduction portion 29B Gas discharge portion 30 Pump fixing lid 31 Vertical portion 32 Inclined portion 33 Finger hook portion 34 Tip portion 34A Engaging claw portion 40 Pump unit 41 Diaphragm 42 Movable body 43 Magnet 44 Position control lever Portion 45 head portion 48 electromagnet 50 chassis 51 top surface portion 51A engaged portion 52 engaging hole 53 back surface portion 54 locking hole 55 connector for connection 60 front cover lid 61 lid body 61A pivot shaft 61B bearing portion 62 for display / Circuit board for operation 63 Inner lid 63A Elastic member 64 Flat cable 65 Claw part for engagement 67 Visual opening 68 Display part 69 Operation part 70 Gas sensor unit 70A Name plate 71 Sensor case 72 Gas sensor 73 Sensor board 78 Flow sensor 80 For fixing Mounting member 81 Fixed substrate (wall hanging angle)
82 Standing portion 82A Bending portion 83 Upper side locking portion 83A Claw-like projection 84 Lower side locking portion 84A Claw-like projection 85 Mounting opening 86 Connecting connector portion 87 Horizontal portion 88 Power cable drawing opening portion 90 Locking member 91 Body portion 92 Claw portion for engagement 93 Lever portion 94 Locking portion 95 Mounting portion

Claims (4)

A gas alarm device whose rear back surface is fixed to a vertical mounting surface,
A substantially rectangular parallelepiped outer casing,
A pump unit in which a movable body provided with a magnet is fixed to a rubber diaphragm and is detachably mounted in a pump mounting portion formed in a front side region in the outer casing and an electromagnet for driving the movable body. An electromagnetically driven pump;
A pump fixing lid that opens and closes the pump mounting portion, wherein the portion corresponding to the magnet in the movable body is inclined and extended toward the front upper side,
A gas sensor unit that is detachably mounted on a gas sensor mounting portion formed at a front position of the pump mounting portion when the pump fixing lid is closed;
It has a pivot shaft extending in the width direction, and the pivot shaft is supported by a support portion at the lower end position of the front edge of the outer casing, and is closed and opened by the front cover lid lock mechanism. A front cover lid for opening and closing the gas sensor mounting portion, which is provided so as to be rotatable between the open position and the open position,
The gas sensor unit is configured such that a gas sensor and a sensor substrate that processes an output signal of the gas sensor are accommodated in a sensor case corresponding to the type of the gas sensor, and the sensor case is formed by an inclined portion of a pump fixing lid. A gas alarm device having a configuration suitable for a gas sensor mounting portion including a portion to be defined.   By sliding downward with respect to the fixing mounting member fixed to the vertical mounting surface, the rear back surface is locked to the locking portion of the fixing mounting member, and the lower surface portion is provided to the fixing mounting member. The gas alarm device according to claim 1, wherein the gas alarm device is detachably mounted by being engaged with the lock member.   Both sides of the outer casing are substantially flat with no protrusions outward, and all of the components including the mounting member for fixing are housed in the width area of the outer casing. The gas alarm device according to claim 1 or 2.   The gas alarm device according to any one of claims 1 to 3, wherein a large number of gas sensors having different types of gas sensors are arranged in the width direction.

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