JP2001338365A - Rack built-in type gas alarm system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rack built-in type gas alarm system in which parts can relatively easily be exchanged without needing a special tool. SOLUTION: A pump unit 30 and a gas sensor 23 which are frequently subjected to maintenance are elastically held by a fixing frame 7 with insertable and extractable fixtures 34 and 52, and the fixing frame 7 can also be inserted and extracted into/from a base body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas alarm device for centrally managing gas concentrations at a plurality of sites to be measured at a central monitoring station, and more particularly, to a gas alarm which is used by being intensively mounted on a rack. Related to the device.

[0002]

2. Description of the Related Art A device for centrally controlling gas concentration by mounting a plurality of gas alarm devices on a rack generally includes a pump unit for sampling air at a monitoring site, a gas sensor, a signal processing circuit board, and The display means is configured as a unit housed in a box. Depending on the monitoring site, a monitoring system is constructed by housing several tens of such units in a rack, and in order to maintain the reliability of the monitoring system, maintenance of individual gas alarm devices without shutting down the system Is important.

[0003]

However, such a device is housed in a case having a volume as small as possible,
In order to reduce the installation area, there is a problem that a special tool is required for replacing the pump unit and the gas sensor, which are liable to cause a failure or an inconvenience, and there is a problem that the operation is difficult. The present invention has been made in view of such circumstances, and has as its object the purpose of a rack-integrated type in which parts can be replaced relatively easily without requiring special tools. It is to provide a gas alarm device.

[0004]

According to the present invention, there is provided an outer case having at least a back portion opened, a base insertable from the back portion of the outer case, and gas on the side surface. A window through which a sensor can be inserted, and a connection frame for connecting to a pump unit formed on the back surface, and a mounting frame whose at least bottom portion is guided by the base;
A sensor mounting device fixed to the frame body and connected to the pump unit via a connection unit, and removably engaged with a gas inlet of the gas sensor; and a mounting frame and a rear surface of the pump unit. A first fixing member elastically reciprocally engageable and a second fixing member elastically reciprocally engageable with the mounting frame and the rear surface of the gas sensor.

[0005]

The gas sensor and the pump unit, which are frequently maintained, are elastically held on the mounting frame by means of a movable fixture, and the mounting frame can also be moved forward and backward with respect to the base. By pulling out and removing the fixture, the sensor and pump can be removed from the mounting frame without the need for tools.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 1 shows an embodiment of the present invention, in which an outer case 1 containing a pump unit, a gas sensor, a signal processing circuit board, a display means and the like has an exposed surface when housed in a rack. A cover 2 that allows the built-in display means 3 to be operated and a window 5 that exposes the display surface of the flow meter 22 are provided on the front surface, and a base member 8 to be described below is fixed at a lower part of the front surface by a screw 6 with a grip. Is fixed to the projection 11a.

Next, the structure in the case will be described with reference to FIGS. FIG. 2 shows an embodiment of the base body 8 which is integrated with the outer case 1 to form a box. The base body 8 forms the back cover 10 and the base 11 of the outer case 1. Further, a metal is pressed into a substantially "L" shape having a wall portion 12 serving as a positioning member and a reinforcing member of the outer case 1 on the side surface. In addition, substantially “L” -shaped claws 12 a, 12 a
Are formed so as to protrude, and are configured to engage with the slits 1a, 1a on the opening side of the outer case 1, that is, on the rear side, to define the engagement position between them.

[0008] A terminal plate 13 for electrical connection to an external device is screwed to the back cover 10. On the other hand, through holes 14, 15, and 16 are formed in the base 11, and the first hole is connected to the cable lead-in protection device 17 and the pump unit.
Are connected and fixed to the flow path unit 20.

The upper ends 18a, 1a of these connecting members 18, 19
9a has a first channel in which two flow paths 20a and 20b are formed.
The connection ports 20c and 20d of the connection unit 20 are connected, and are connected to the flow meter 22 and the gas sensor 23 via the second connection unit 21.

The second connection unit 21 is formed with two flow paths 21a and 21b connected to the respective flow paths 20a and 20b of the first connection unit 20, and each has a horizontally extending rear end. Taper portions 21c and 21d are formed in the connection ports 20e and 20f of the first connection unit 20 so as to fit in an airtight and detachable manner.

On the other hand, the flow path 21a on the front side extends horizontally and is connected to a sensor mounting tool 24 having a gas sensor mounting port 24a, and the other flow path 21b is raised upward to form a pump unit. It is communicated with 30 discharge ports b.

FIG. 3 shows a state in which it is detachably attached to the base 8.
FIG. 4 shows an embodiment of a mounting frame 7 to which each member is assembled. The mounting frame 7 has a window 7a on at least one side surface into which a gas sensor 23 described later can be inserted, and a gas sensor mounting on the front side. Sensor mounting port 24 of tool 24
A window 7b capable of opening a is formed. The gas sensor attachment 24 has a cavity formed therein which communicates with the gas inlet 26 of the gas sensor 23. The cavity communicates with the cavity and is connected to the opening 21 e of the flow path 21 a of the second connection unit 21. Is formed with a connection fixing port 24b which is opened at an upper portion of a region not located on the same line.

The flow meter 22 is provided with a flow pipe 27
However, the upper end 27a is connected to the suction port 30 of the pump unit 30.
a, and a lower end of the filter 2 is connected to a connection fixing port 25c of the base 25 having a chamber 25b sealed with a lid 25a.
8 and is fixed to the connection fixing port 24b via the connection tool 29.

In this embodiment, the pump unit 30 includes an electromagnetic vibrating body 31 and a diaphragm pump 32 driven reciprocally by the electromagnetic vibrating body 31 and a suction port 30 a and a discharge port 3.
Ob is projected and fixed to the frame 33.
The pump unit 30 is detachably fixed to the mounting frame 7 via a first fixture 34, and a pump connection unit 35 connected to the suction port 30a and the discharge port 30b is disposed on the front surface.

The first fixing member 34 has a main body 34a in contact with the back surface of the frame 33, and a first grip 34b protruding from both sides of the main body 34a and engaging with the elongated hole of the mounting frame 7.
And the second gripping portion 34c that engages with the claw 7d of the mounting frame 7.
It is composed of The first grip 34 is relatively short so as to maintain rigidity, and the second grip 34c
Is provided with windows 34d so as to form branches on both sides (upper and lower sides in the figure), and is configured to be more easily elastically deformed than the first grip 34b. This makes it possible to rotate the fixing member 34 in a horizontal plane with the first holding portion 34b as a fulcrum about the long hole of the mounting frame 7 to move the fixing member 34 out of the region of the frame 33, and to use fixing means such as screws. The pump unit 30 can be easily fixed and can be easily removed without any problem.

The connection unit 35 has a suction port 30 on the rear side.
a, a pump connection port for engaging with the discharge port 30b, and upward and downward connection openings 36a, 37 on the front side.
pump unit 30 comprising flow paths 36 and 37 having
Are connected to the second channel unit 21 and the flow meter 22.

The sensor 23 has a connector pin 40 attached to a side surface thereof for supplying operating power and extracting a detection signal. The sensor circuit unit 41 is configured such that a required circuit is mounted on a circuit board 42 and a connector pin 4 is provided on one end side.
The socket 43 connected to the signal processing unit 44 is provided with a connector pin 46 connected to the socket 45 of the signal processing unit 44 at the other end, and is fixed to a side surface of the sensor 23 by a screw 47.

These members are attached to the attachment frame 7 at important points. The mounting frame 7 is screwed to the mounting protrusion 11b of the base 8 via a protrusion 7e as necessary. With the gas inlet 26 inserted into the opening of the gas sensor attachment 24 via the packings 50 and 51, the sensor 23 is attached to the mounting frame 7 by the second fixture 52.
It is fixed to.

The metal fitting 52 has a first arm 52a which engages with the mounting hole 7c of the mounting frame 7 on the front side, and a second arm 52b which contacts the back side of the sensor 40 on the rear side. The metal plate is formed into a substantially U-shape by press working, and the sensor 23 is attached to the gas sensor by the elasticity of the second arm 52b while holding the reference position determined by the mounting frame 7 by the arm 52a. It is pressed and fixed to the tool 24. Reference numeral 60 in the drawing denotes an insulating cover whose one side is semi-fixed to the mounting frame 7 via the claw 60a.

As shown in FIG. 4, the signal processing unit 44 is fixed to the upper surface of the mounting frame 7 by screws so that the signal processing unit 44 is sandwiched between the protection plates 54, and the holding battery 55 is adhered to the fixing portion 56 on both sides. It is detachably attached by a tape 57.

In this embodiment, the sensor mounting member 24 is fixed to the front surface of the mounting frame 7 with screws 61,
Fix 2 etc. Next, the gas sensor 23 is pushed into the other side from the window 7a on the side of the mounting frame 7 to push the gas inlet 2
6 is pushed toward the front side facing the sensor mounting opening 24a. In this state, when the first arm 52a of the second fixture 52 is engaged with the mounting hole 7c of the mounting frame 7 and is pushed inward,
The arm 52a moves while being guided by the mounting hole 7c of the mounting frame 7, and in this process, the second arm 52b is elastically deformed and gets over the back surface of the sensor 23, and the gas sensor 23 is pressed against the gas sensor mounting device 24 by the elastic pressure. Fix it.

On the other hand, when the pump unit 30 is pushed into the specified position of the mounting frame 7 via the connection unit 35, the pump unit 30
And a flow meter 22. Then, the first fixture 34
When the first holding portion 34b is engaged with the mounting frame 7 and rotated, the second holding portion 34c is elastically deformed and the frame 3
3, the pump unit 30 is fixed to the mounting frame 7 by engaging with the claws 7d of the mounting frame 7.

Further, after the second connection unit 21 and the signal processing unit 44 are mounted on the mounting frame 7, the terminal plate 1
When the protrusions on the bottom surface of the mounting frame 7 are aligned and pushed into two parallel long guide holes 11c provided on the base body 8 to which the first and third connection units 20 and the like are fixed, the signal processing unit 44 Is connected to the socket 1 of the terminal plate 13.
3a and the tapered portions 21c and 21d at the tip of the second connection unit 21 are connected to the connection port 20 of the first connection unit 20.
e, enter 20f. The elongated hole 11c and the protrusion 11 of the base 8
With the case 1 pushed to the position regulated by d, the case 1 is inserted and fixed to the fixing protrusion 11 a of the mounting frame 7 with the screw 6.

When maintenance is required, when the screw 6 is removed and the case 1 is removed, and the mounting frame 7 is pulled forward, the mounting frame 7 is guided by the elongated hole 11c and reaches a predetermined position. When it reaches, it engages with the claw 11e formed on the back side formed on the base body 8 and is prevented from moving. This prevents the attachment frame 7 and the units attached thereto from falling due to loss of support of the base 11.
When it is desired to completely remove the mounting frame 7 and the like from the base 11, it is possible to avoid the engagement with the claw 11e by slightly lifting the mounting frame 7 and engaging with the claw 11e before engaging with the claw 11e. it can.

Thus, even if similar devices are arranged adjacent to each other, the user can concentrate on maintenance work without worrying about falling. When the gas sensor 23 and the pump unit 30 are to be removed, the second fixture 52
Alternatively, the engagement with the mounting frame 7 may be released by operating the first fixture 34 in the direction opposite to the direction in which the first fixture 34 is fixed.

[0026]

As described above, according to the present invention, an outer case having at least a back portion opened, a base insertable from the back portion of the outer case, and a window into which a gas sensor can be inserted on the side surface. A mounting frame formed on the back surface with connection means for the pump unit, and at least a bottom portion guided by the base; a mounting frame fixed to the frame body and communicating with the pump unit via the connection unit; A sensor mounting device detachably engaged with the intake, a first fixing device elastically removably engaged with the mounting frame and the back surface of the gas sensor, and a mounting device and a back surface of the pump unit; Since the second fixing device is provided so as to be elastically movable forward and backward, the gas sensor and the pump unit which are frequently required to be maintained can be fixed with the mounting frame pulled out from the base. Only moved forward and backward relative to the mounting frame, can be removed without the need for tools.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are respectively a perspective view showing an embodiment of a gas alarm device incorporated in a rack of the present invention, and a front view showing a state in which a case is removed.

FIG. 2 is an assembled perspective view showing a structure of a base and a flow path unit attached to the base, which constitutes the above device.

FIG. 3 is an assembled perspective view of a mounting frame that constitutes the above device, and members that are located on the rear side among members fixed to the mounting frame.

FIG. 4 is an assembled perspective view of a mounting frame that constitutes the above device, and a member positioned on an upper side of members fixed to the mounting frame.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 outer case 7 mounting frame 8 base 20 first flow path unit 21 second connection unit 22 flow meter 23 gas sensor 24 gas sensor mounting tool 30 pump unit 34 first fixing tool 41 sensor circuit unit 44 signal processing unit 52 Second fixture

Claims (1)

[Claims] 1. An outer case having at least a back portion opened, a base insertable from the back portion of the outer case, a window into which a gas sensor can be inserted on a side surface, and a connection means for connecting a pump unit to the back surface. Is formed, and at least a bottom part is guided by the base body, is fixed to the frame body, communicates with the pump unit via a connection unit, and is detachably engaged with a gas inlet of the gas sensor. A first mounting member elastically reciprocally engaging with the mounting frame and the rear surface of the pump unit; and a first fixing device elastically reciprocating with the mounting frame and the rear surface of the gas sensor. A rack-mounted gas alarm device comprising a second fastener operably engaged.