JP5208660B2 - Gas alarm device - Google Patents

Description

  The present invention relates to a fixed wall-type gas alarm device that is fixedly installed on 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 particular 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

In such a gas alarm device, as a gas supply mechanism for supplying a gas to be detected to a gas sensor, for example, a pump unit in which a movable body having a magnet is fixed to a rubber diaphragm, and a movable body with a magnetic action In general, an electromagnetically driven pump device including an electromagnet that reciprocates the diaphragm by swinging using a gas pump is used. It is necessary to change the frequency about once a year.
However, in the conventional pump device, the pump unit and the electromagnet are integrally formed, and the electromagnet that is not necessarily required to be replaced together with the pump unit is replaced together. The work itself is troublesome and wasteful in terms of resources, and is disadvantageous in terms of cost when producing a gas alarm device.

  The present invention has been made on the basis of the circumstances as described above, and at the time of replacement of the pump device, it is possible to replace only the necessary components, thereby saving resources and replacing the pump device. An object of the present invention is to provide a gas alarm device that is easy to perform maintenance work and has high maintainability.

The gas alarm device according to the present invention includes a pump unit in which a movable body having a magnet is fixed to a rubber diaphragm that forms a pump chamber therein, and a movable body separated from the pump unit. And a pump device composed of an electromagnet that reciprocates and moves the diaphragm.
The pump unit is detachably attached to the pump unit mounting portion in the gas alarm device main body, and an electromagnet is provided fixed to the gas alarm device main body ,
In the gas alarm device main body, the pump fixing lid that opens and closes the pump unit mounting portion consisting of a recess opening forward is set to a closed position and an open state where the pump fixing lid is fixed to the closed state by the pump fixing lid locking mechanism. It is provided so as to be rotatable between the open position and
In a state where the pump unit is inserted and arranged in the pump unit mounting portion from the front side, the pump fixing lid is closed, whereby the pump unit is pressed inward by the pump fixing lid and the pump It is set in the pump unit connection part formed in the unit mounting part .

  Further, in the gas alarm device of the present invention, the position restricting rail portion is formed on the side surface portion of the pump unit so as to extend in the front-rear direction, and the position restricting rail portion is formed in the pump unit mounting portion. It is preferable that the pump unit is accommodated in the pump unit mounting portion by being guided along the guide member.

  Furthermore, in the gas alarm device of the present invention, it is preferable that a cushion member is provided on each of the inner surface of the rear wall defining the pump unit mounting portion and the inner surface of the pump fixing lid. .

Furthermore, in the gas alarm device of the present invention, the gas alarm device main body is provided with a substantially flat, rectangular parallelepiped outer casing whose both side surfaces do not protrude outward, and the pump fixing lid is in a closed state. The front cover lid having a pivot shaft extending in the width direction that opens and closes the gas sensor mounting portion formed of a recess opening forward is formed at the lower end position of the front edge of the outer casing. It is supported by the support part, and is rotatably provided between a closed position that is fixed in a closed state by a front cover lid lock mechanism and an open position that is tilted downward by its own weight and opened.
When the gas alarm device body is slid downward relative to the fixing mounting member fixed to the vertical mounting surface, the rear rear surface is locked to the locking portion of the fixing mounting member and the lower surface portion is fixed. It can be set as the structure attached to the lock member provided in the mounting member for attachment so that attachment or detachment is possible.

  According to the gas alarm device of the present invention, when replacing the pump device, an electromagnet that is not necessarily replaced with the pump unit can be used as it is, and only the pump unit can be replaced. Resource saving can be achieved and high maintainability can be obtained.

  In addition, since the pump unit can be attached and detached by opening and closing the pump fixing lid, maintenance work including replacement of the pump unit can be easily performed, and the pump unit is mounted on the pump unit mounting portion. When the pump fixing lid is closed in the state of being housed in the pump unit, the pump unit is pressed by the pump fixing lid and set in a predetermined connection portion. Thus, the pump unit can be reliably and easily mounted in a state in which high airtightness is ensured, and thus high workability can be obtained in maintenance work and the like.

  Furthermore, the position regulating rail portion formed to extend in the front-rear direction on the side surface portion of the pump unit is guided along the guide member formed on the pump unit mounting portion, so that the pump unit is accommodated in the pump unit mounting portion. Since the pump unit is accommodated in the pump unit mounting portion in a state where the pump unit is regulated at an appropriate position by simply inserting the pump unit into the pump unit mounting portion. It can be set easily and reliably.

  Furthermore, since the cushion member is provided on each of the inner surface of the rear wall defining the pump unit mounting portion and the inner surface of the pump fixing lid, the pump unit and the pump unit connecting portion are The desired airtightness can be reliably obtained, and the influence on the output of the gas sensor due to vibration can be reduced, so that the desired gas detection can be performed with high reliability.

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, FIG. 5 is a perspective view showing the configuration of the inner casing member together with the pump unit, and FIG. 6 is a state where the gas sensor unit of the gas alarm device shown in FIG. FIG.
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. A gas sensor comprising a main substrate 14 arranged to extend in the front-rear direction and a recess opening forwardly formed in the outer casing 20. A front cover lid 60 that opens and closes the mounting portion, and the gas sensor 72 is housed in a sensor case 71 corresponding to the type of the gas sensor 72 together with a sensor substrate 73 that processes an output signal of the gas sensor 72. The gas sensor unit 70 is unitized and is detachably mounted on a gas sensor mounting portion (hereinafter referred to as “gas sensor unit mounting portion”) 16.

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 unit mounting portion, the gas sensor connecting portion, and all other mounting portions for the component parts into which the 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 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 end portions of the lower edge portion, and has a pivot shaft 61A extending in the width direction with both end portions 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. 9). Thus, the gas alarm device main body 10 is electrically connected to the main board 14 and the pivot shaft 61A is supported by the support portion formed at the front edge portion of the base member 11, so that the front cover lid lock machine 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.

  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.

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

  In this gas alarm device, when the pump fixing lid 30 is closed, as shown in FIG. 6, the gas sensor unit is mounted at the front position of the pump unit mounting portion 26 with a recess opening forward. 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 that matches the gas sensor unit mounting portion 16. Therefore, in this gas alarm device, a plurality of gas sensor units including gas sensors 72 having different types of detection target gases or different detection levels from each other. Any one of the gas sensor units selected according to the purpose is configured to be replaceable with another gas sensor unit including a gas sensor of a different type from the gas sensor according to the gas sensor unit.

  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, and is electrically connected to the connection connector portion 16A in the gas alarm device main body 10. In a state of being connected to the gas sensor unit, the gas sensor unit mounting portion 16 is accommodated and arranged. 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.

  Thus, in this gas alarm device, as described above, an electromagnetically driven pump device is used. In this pump device, the pump unit 40 and the electromagnet 48 are separated. Yes.

  As shown in FIG. 7, the pump unit 40 includes a casing 401 in which a head portion 45 having a gas suction portion 45 </ b> A and a gas discharge portion 45 </ b> B is integrally formed on the back surface, and a columnar shape accommodated in the casing 401 or A bottomed cylindrical pump that forms a truncated cone-shaped internal space, for example, a diaphragm 41 made of rubber, and a pump chamber S of variable capacity inserted between the diaphragm 41 and the inner peripheral surface of the diaphragm 41. The chamber 46, the disc-shaped check valve 47 disposed in contact with the outer surface of the bottom wall of the pump chamber 46, and the diaphragm 41 is inserted and the pump chamber 46 and the head portion are inserted through the peripheral wall of the diaphragm 41. 45, the ring-shaped hobbed and held by engaging portions 402 formed on both side walls of the casing 401. The shaft 49 is fixed by a screw member 411 and a fixing nut 412 in a state of being in horizontal contact with the bottom of the diaphragm 49 and the diaphragm 41 and swings around a pivot shaft 421 (see FIG. 5) extending in the width direction. The movable body 42 is movably supported by the casing 401, and the magnet 43 is formed of a permanent magnet such as a ferrite magnet or a rare earth magnet held by a magnet holding portion 422 in the movable body 42. Reference numerals 46A and 46B in FIG. 7 are through holes connected to the gas suction part 45A and the gas discharge part 45B in the head part 45, respectively.

The electromagnet 48 includes a core material 481 formed by laminating a plurality of plate materials made of, for example, a silicon steel plate so that the magnetic pole forming surface has an area of a predetermined size, A bobbin 482 attached to one leg of the core member 481 and a coil 483 wound around the peripheral wall of the shaft part of the bobbin 482 (see FIG. 3). Here, the area of the magnetic pole forming surface of the core material 481 is, for example, 800 to 1000 mm ² , and the distance between the centers of the magnetic pole forming surfaces is, for example, 8 to 10 mm.

The electromagnet 48 has an appropriate size in a state where the arrangement position of the movable body 42 with respect to the magnet 43 in the front-rear direction is restricted and the magnet 43 of the movable body 42 is positioned between the magnetic pole forming surfaces of the core material 481. It is arranged so as to face the magnet 43 of the movable body 42 through a gap restricted by the thickness.
Here, the size of the gap between the magnetic pole forming surface of the core material 481 and the magnetic pole surface of the magnet 43 in the movable body 42 (the vertical separation distance) is, for example, 1 to 3 mm.

  As an example of the configuration of the pump device, the stroke of the diaphragm 41 (displacement amount in the width direction of the fixed portion) is, for example, 2 mm, and the gas discharge amount is, for example, a flow rate of 0.5 to 1.5 liters / min. Of gas to be supplied to the gas sensor 72, for example, 0.5 liter / min, and the degree of vacuum is, for example, 10 kPa.

In this gas alarm device, as shown in FIG. 8, 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 side portion of the pump unit 40 is 9 is guided along the guide member 26B in the pump unit mounting portion 26, and is housed and disposed in the pump unit mounting portion 26 as shown in FIG. . 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. The head portion 45 is set to the pump unit connecting portion 26A by being pressed inward via two cushion members 27B provided at the inner surface of the vertical portion 31 at the portions contacting both side portions of the front surface of the pump unit 40. It is assumed that it was done.
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 this pump device, for example, when high-frequency AC power having a frequency of 90 Hz or more is applied to the electromagnet 48, the magnet 43 in the movable body 42 is reciprocated between the magnetic pole forming surfaces of the core member 481, and the entire movable body 42 is moved. Oscillating about the pivot shaft 421 (the fixed portion with respect to the diaphragm 41 is displaced along the axial direction of the diaphragm 41), whereby the diaphragm 41 is reciprocated in the axial direction and is pumped from the gas suction portion 45A. The test gas is sucked into S and the test gas is discharged through the gas discharge part 45B. By applying a high frequency of 90 Hz or higher, the required gas flow rate can be ensured not by increasing the volume change amount of the pump chamber S but by increasing the number of times of expansion and contraction of the diaphragm 41. The degree of deterioration of the diaphragm 41 due to deformation in the direction in which the gas is stretched can be suppressed to a small size, the apparatus can be miniaturized, and the influence on gas detection due to pulsation can be reduced.

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 adjacent gas alarm devices may be set to, for example, 10 mm or less by fixing the gas alarm device by the above-described attachment / detachment method. It can also be substantially 0 mm.

  Thus, according to the gas alarm device having the above configuration, when the pump device is replaced, the electromagnet 48 that is not necessarily replaced with the pump unit 40 can be used as it is, and only the pump unit 40 is used. Since they can be exchanged, it is possible to save resources and obtain high maintainability. Further, the gas alarm device can be advantageously produced in terms of cost.

Moreover, since the pump unit 40 can be attached and detached by opening and closing the pump fixing lid 30, maintenance work including replacement of the pump unit 40 can be easily performed. When the pump fixing lid 30 is closed in the state accommodated in the pump unit mounting part 26, the pump unit 40 is provided with a cushion member 27B provided on the inner surface of the rear wall that defines the pump unit mounting part 26, and Since the pump unit 40 is pressed through a cushion member 27A provided on the inner surface of the pump fixing lid 30 and is set in the pump unit connection portion 26A, the pump unit 40 has high airtightness. It can be easily installed in the secured state, and the side surface of the pump unit 40 The position regulating rail portion 44 formed in the minute is guided along the guide member 26B formed in the pump unit mounting portion 26, so that the pump unit 40 is accommodated in the pump unit mounting portion 26. Thus, simply inserting the pump unit 40 into the pump unit mounting portion 26 allows the pump unit 40 to be accommodated in the pump unit mounting portion 26 in a state of being regulated at an appropriate position. And it can set reliably, Therefore High workability | operativity can be acquired in a maintenance operation | work etc.
Furthermore, these cushion members 27A and 27B can reduce the influence on the output of the gas sensor due to vibrations of the pump unit 40 and the like, and desired gas detection can be performed with high reliability.

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

(1) The gas alarm device main body 10 is slid downward in a state in which the gas alarm device main body 10 is aligned with the fixing mounting member 80 fixed to the attachment surface, thereby causing the upper side locking portion 83 of the fixing mounting member 80 to move. 10, the lower side 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 main body 10, The engaging claw portion 92 of the lock member 90 is engaged with the engaging opening 13A of the base member 11 in the gas alarm device main body 10, whereby the gas alarm device main body 10 is 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.

(2) 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.

(3) When all of the constituent members including the fixing mounting member 80 are housed in the width region of the outer casing 20, when a large number of the members are arranged in parallel, the adjacent gas alarm device The space between them can be made as small as possible, in particular, the gas alarm device can be installed closely, and the installation occupation area can be further reduced.

  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. Since 40 can be easily set by a simple operation, it is 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, the gas sensor need not be configured to be unitized with the sensor substrate and mounted on the gas sensor mounting portion.

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 gas sensor unit of the gas alarm device shown in FIG. 1 was removed. It is sectional drawing which shows the structure of 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 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 part 29A Gas introduction part 29B Gas discharge part 30 Pump fixing cover 31 Vertical part 32 Inclination part 33 Finger hook part 34 Tip part 34A Engaging claw part 40 Pump unit 401 Casing 402 Engagement part 41 Diaphragm 411 Screw part 412 Fixing nut 42 Movable body 421 Pivot shaft portion 422 Magnet holding portion 43 Magnet 44 Position regulating rail portion 45 Head portion 45A Gas suction portion 45B Gas discharge portion 46 Pump chamber 46A, 46B Through hole 47 Check valve 48 Electromagnet 481 Core material 482 Bobbin 483 Coil 49 Holder S Pump chamber 50 Chassis 51 Top surface portion 51A Engaged portion 52 Engagement hole 53 Back surface portion 54 Locking hole 55 Connector for connection 60 Front cover lid 61 Lid body 61A Pivoting shaft 61B Bearing Display unit 62 Display / operation circuit board 63 Inner lid 63A Elastic member 64 Flat cable 65 Engaging claw 67 Visual recognition opening 68 Display unit 69 Operation unit 70 Gas sensor unit 70A Name plate 71 Sensor case 72 Gas sensor 73 Sensor substrate 78 Flow rate Sensor 0 fixing the mounting member 81 fixed substrate (wall-mounted 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 movable body having a magnet is fixed to a rubber diaphragm that forms a pump chamber inside, and the movable body separated from the pump unit is swung using a magnetic action. A gas alarm device comprising a pump device composed of an electromagnet that reciprocates the diaphragm,
The pump unit is detachably attached to the pump unit mounting portion in the gas alarm device main body, and an electromagnet is provided fixed to the gas alarm device main body ,
In the gas alarm device main body, the pump fixing lid that opens and closes the pump unit mounting portion consisting of a recess opening forward is set to a closed position and an open state where the pump fixing lid is fixed to the closed state by the pump fixing lid locking mechanism. It is provided so as to be rotatable between the open position and
In a state where the pump unit is inserted and arranged in the pump unit mounting portion from the front side, the pump fixing lid is closed, whereby the pump unit is pressed inward by the pump fixing lid and the pump A gas alarm device that is set in a pump unit connection portion formed in a unit mounting portion . A position restricting rail portion is formed on the side surface portion of the pump unit so as to extend in the front-rear direction, and the position restricting rail portion is guided along a guide member formed on the pump unit mounting portion. The gas alarm device according to claim 1, wherein the unit is accommodated in a pump unit mounting portion . The gas alarm device according to claim 1 or 2 , wherein a cushion member is provided on each of the inner surface of the rear wall defining the pump unit mounting portion and the inner surface of the pump fixing lid . The main body of the gas alarm device is provided with a substantially flat rectangular parallelepiped outer casing whose both side surfaces do not protrude outwardly, and opens to the front formed by closing the pump fixing lid. A front cover lid that has a pivot shaft extending in the width direction that opens and closes the gas sensor mounting portion made of a recess, and the pivot shaft is supported by a support portion at the lower end position of the front edge of the outer casing, and a front cover lid lock mechanism It is provided so as to be rotatable between a closed position fixed in a closed state by an open position and an open position tilted downward by its own weight to be opened.
When the gas alarm device body is slid downward relative to the fixing mounting member fixed to the vertical mounting surface, the rear rear surface is locked to the locking portion of the fixing mounting member and the lower surface portion is fixed. The gas alarm device according to any one of claims 1 to 3, wherein the gas alarm device is detachably mounted by being engaged with a lock member provided on the mounting member .

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