JP3591637B2 - Rack built-in gas alarm - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas alarm device that centrally manages gas concentrations at a plurality of sites to be measured at a central monitoring station, and more particularly to a gas alarm device that is collectively mounted and used on a rack.
[0002]
[Prior art]
A device for centrally managing gas concentration by mounting a plurality of gas alarm devices on a rack usually includes a pump unit for sampling air at a monitoring site, a gas sensor, a signal processing circuit board, and a display means. It is configured as a unit housed in the.
Depending on the monitoring site, a monitoring system is constructed by housing several tens or more of these units in racks. To maintain the reliability of the monitoring system, maintain individual gas alarm devices without shutting down the system. Is important.
[0003]
[Problems to be solved by the invention]
However, such a device needs to be housed in a case as small as possible to reduce the installation area, and requires special tools to replace the pump unit and gas sensor, which are liable to malfunction and inconvenience. And there is a problem that the work involves difficulty.
The present invention has been made in view of such circumstances, and has as its object the purpose of a rack-integrated type that can relatively easily replace parts without requiring special tools. It is to provide a gas alarm device.
[0004]
[Means for Solving the Problems]
In order to solve such a problem, in the present invention, at least an outer case having an open back portion, a base that can be inserted from the back portion of the outer case, and a window into which a gas sensor can be inserted on the side surface, Further, a connecting means for connecting to the pump unit is formed on the back surface, and at least a bottom portion is fixed to the frame body and is connected to the pump unit via a connecting unit, and the bottom of the mounting frame is guided by the base. A sensor attachment detachably engaged with a gas inlet, a first fixture elastically reciprocally engaged with the attachment frame and a back surface of the pump unit, the attachment frame and the gas sensor And a second fixing member which elastically engages with the rear surface of the second fixing member.
[0005]
[Action]
The gas sensor and the pump unit, which require frequent maintenance, are elastically held on the mounting frame by means of a fixture that can move forward and backward, and the mounting frame can also move forward and backward with respect to the base, so the mounting frame is pulled out from the base and fixed. By removing the fixture, the sensor and pump can be removed from the mounting frame without the need for tools.
[0006]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Therefore, the details of the present invention will be described below based on the illustrated embodiment.
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. The front surface is provided with 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. Is fixed to the projection 11a.
[0007]
Next, the structure in the case will be described with reference to FIGS.
FIG. 2 shows an embodiment of a base body 8 that forms a box integrally with the outer case 1, and the base body 8 forms a back cover 10 and a base 11 of the outer case 1. Further, a metal is pressed into a substantially "L" shape having a wall portion 12 on the side surface which also serves as a positioning member and a reinforcing member of the outer case 1. In addition, substantially “L” -shaped claws 12 a, 12 a are formed so as to protrude from the lower side surface of the back cover 10, and are engaged with the slits 1 a, 1 a on the opening side of the outer case 1, that is, on the back side. It is configured to define the engagement position of both.
[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, 16 are formed in the base 11, and connectors 18, 19 for connecting with the first channel unit 20 connected to the cable draw-in protection 17, the pump unit and the like are fixed through. Have been.
[0009]
The connection ports 20c and 20d of the first connection unit 20 in which two flow paths 20a and 20b are formed are connected to upper ends 18a and 19a of these connection tools 18 and 19, and are connected via the second connection unit 21. It is connected to a flow meter 22 and a gas sensor 23.
[0010]
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. Taper portions 21c and 21d are formed in the connection ports 20e and 20f of the connection unit 20 so as to fit in an airtight and detachable manner.
[0011]
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 discharge the gas from the pump unit 30. It is connected to the outlet b.
[0012]
FIG. 3 shows an embodiment of a mounting frame 7 which is detachably attached to the base 8 and in which the respective members are assembled. The mounting frame 7 has at least one side surface on which a gas sensor 23 described later is inserted. A possible window 7a and a window 7b which can open a sensor mounting opening 24a of the gas sensor mounting tool 24 are formed on the front side.
The gas sensor mounting tool 24 has a cavity formed therein which communicates with the gas inlet 26 of the gas sensor 23, and communicates with the cavity and connects with 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 above a region not located on the same line.
[0013]
The flow meter 22 has a flow path tube 27 having an upper end 27a communicating with a suction port 30a of a pump unit 30 and a connection fixing port of a base 25 having a chamber 25b sealed with a lid 25a. 25c, and the lower end is fixed to the connection fixing port 24b via a connector 29 with a filter 28 interposed.
[0014]
In this embodiment, the pump unit 30 is configured by fixing an electromagnetic vibrator 31 and a diaphragm pump 32 reciprocally driven by the electromagnetic vibrator 31 to a frame 33 with its suction port 30a and discharge port 30b protruding. I have. 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.
[0015]
The first fixing member 34 includes a main body 34 a that abuts on the back surface of the frame 33, a first grip 34 b that protrudes from both sides of the main body 34 a and engages with a long hole of the mounting frame 7, And a second grip portion 34c that engages with the claw 7d. The first grip 34 is relatively short so as to maintain rigidity, and the second grip 34c is provided with a window 34d so as to form a branch on both sides (upper and lower sides in the figure). It is configured to be more easily elastically deformed than the first grip portion 34b. This makes it possible to rotate the fixing member 34 in the horizontal plane with the first holding portion 34b as a fulcrum about the long hole of the mounting frame 7 to advance and retreat from the region of the frame body 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.
[0016]
The connection unit 35 includes a pump connection port that engages with the suction port 30a and the discharge port 30b on the back side, and includes flow paths 36 and 37 that have upward and downward connection openings 36a and 37a on the front side. The unit 30 is connected to the second channel unit 21 and the flow meter 22.
[0017]
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 includes a socket 43 connected to a connector pin 40 at one end and a connector pin 46 connected to a socket 45 of a signal processing unit 44 at the other end. And is fixed to the side surface of the sensor 23 by a screw 47.
[0018]
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. The sensor 23 is fixed to the mounting frame 7 by the second fixture 52 with the gas inlet 26 inserted into the opening of the gas sensor attachment 24 via the packings 50 and 51.
[0019]
The metal fitting 52 has a first arm 52a that engages with the attachment hole 7c of the attachment frame 7 on the front side, and a second arm 52b that contacts the back side of the sensor 40 on the back side. Is formed in a substantially U-shape by pressing, and the sensor 23 is attached to the gas sensor attachment 24 by the elasticity of the second arm 52b while holding the reference position determined by the mounting frame 7 by the arm 52a. The crackdown is fixed. Reference numeral 60 in the figure denotes an insulating cover whose one side is semi-fixed to the mounting frame 7 via the claw 60a.
[0020]
As shown in FIG. 4, the signal processing unit 44 is fixed to the upper surface of the mounting frame 7 with screws so that the signal processing unit 44 is sandwiched between the protection plates 54, and the holding battery 55 is fixed to the fixing portion 56 by a double-sided adhesive tape 57. Removably mounted.
[0021]
In this embodiment, the sensor mounting tool 24 is fixed to the front surface of the mounting frame 7 with screws 61, and the flow meter 22 and the like are fixed. Next, the gas sensor 23 is pushed into the other side from the window 7a on the side of the mounting frame 7, and the gas inlet 26 is pushed toward the front side so as to face 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 is guided by the mounting hole 7c of the mounting frame 7 and moves. In this process, the second arm 52b is elastically deformed and rides over the back surface of the sensor 23, thereby fixing the gas sensor 23 to the gas sensor attachment 24 in a resilient state.
[0022]
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 is connected to the gas sensor mounting tool 24 and the flow meter 22 via the second flow path unit 21. Next, when the first holding portion 34b of the first fixture 34 is rotated by engaging with the mounting frame 7, the second holding portion 34c rides over the frame 33 while being elastically deformed. The pump unit 30 is fixed to the mounting frame 7 by engaging with 7d.
[0023]
Further, after the second connection unit 21 and the signal processing unit 44 are mounted on the mounting frame 7, two parallel guides provided on the base body 8 to which the terminal plate 13 and the first connection unit 20 are fixed. When the protrusion on the bottom surface of the mounting frame 7 is aligned and pushed into the long hole 11c, the connection terminal 44a of the signal processing unit 44 is inserted into the socket 13a of the terminal plate 13 and the tapered portion at the tip of the second connection unit 21. 21 c and 21 d enter the connection ports 20 e and 20 f of the first connection unit 20. The case 1 is inserted and fixed to the fixing protrusion 11 a of the mounting frame 7 with the screw 6 while being pushed to the position regulated by the long hole 11 c and the protrusion 11 d of the base 8.
[0024]
If maintenance is required, the mounting frame 7 is guided by the elongated hole 11c when the mounting frame 7 is pulled forward with the screw 6 removed and the case 1 removed, and when the mounting frame 7 reaches a predetermined position, Engagement with the claw 11e formed on the back side and formed on the back side 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 the claw 11e before engaging with the claw 11e. it can.
[0025]
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 engagement with the mounting frame 7 is released by operating the second fixture 52 or the first fixture 34 in the direction opposite to the direction in which they were fixed. Just fine.
[0026]
【The invention's effect】
As described above, in the present invention, an outer case having at least a back portion opened, a base that can be inserted from the back portion of the outer case, a window into which a gas sensor can be inserted on the side surface, A connection frame with a pump unit is formed, and at least a bottom part is guided by the base body, and is fixed to the frame body, communicates with the pump unit via the connection unit, and is detachable from a gas inlet of a gas sensor. A first fitting that elastically engages with the mounting frame and the back surface of the gas sensor, and a first mounting device that elastically moves with the mounting frame and the back surface of the pump unit. With the second fixing device, the gas sensor and the pump unit, which are frequently maintained, are attached to the mounting frame while the mounting frame is pulled out from the base. Only advancing and retracting Te is, it 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 constitute 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 among 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)

An outer case having at least a back portion opened, a base that can be inserted from the back portion of the outer case, a window into which a gas sensor can be inserted on the side surface, and a connection unit for a pump unit formed on the back surface, and A mounting frame having at least a bottom portion guided by the base body, and a sensor mounting tool fixed to the frame body, connected to the pump unit via a connection unit, and detachably engaged with a gas inlet of the gas sensor. A first fixing member elastically reciprocally engaging with the mounting frame and the back surface of the pump unit; and a first fixing member elastically reciprocatingly engaging with the mounting frame and the back surface of the gas sensor. A rack built-in gas alarm device comprising a second fixture.

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