JP2002324283A - Rack incorporated gas alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously attach and detach fluid connecting means and an electric connecting means by connection and disconnection of a unit. SOLUTION: In this rack incorporated gas alarm formed by attachably and detachably providing a pump unit 1, a gas sensor unit 2 in a chassis 5 via the connecting means and storing the chassis 5 in a detachable exterior case and a base 18, the fluid connecting part 33a, 33b, 22a, 22b and the electric connecting part 34 to constitute the connecting means of the pump unit 1 and the gas sensor unit 2 are arranged so that the direction perpendicular to the front surface of the exterior case is defined as the connecting and disconnecting directions and a fluid connector 60 is movably provided in the chassis 5.

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 managing gas concentration by mounting a plurality of gas alarm devices on a rack is usually 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, so maintaining the reliability of the monitoring system requires maintenance of individual gas alarm devices without shutting down the system. Is important. 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 is accompanied by difficulty.

[0003] In order to solve such a problem, the present applicant has previously disclosed in Japanese Patent Application No. 2000-155697 an external case having at least a rear opening and a base insertable from the rear of the external case. A window into which a gas sensor can be inserted is formed on the side surface, and a connecting means for connecting to the pump unit is formed on the back surface, and a mounting frame whose at least bottom portion is guided by the base, and a connecting unit fixed to the frame body and connected to the pump unit. A sensor mounting device communicating with the gas sensor and removably engaging with a gas inlet of the gas sensor; a first fixing device elastically reciprocally engaging with the mounting frame and the rear surface of the pump unit; A rack-installed gas alarm device including a second fixing member elastically removably engaged with a mounting frame and a back portion of a gas sensor has been proposed.

[0004]

According to this, the gas sensor and the pump unit, which require frequent maintenance, are moved forward and backward with respect to the mounting frame only with the mounting frame pulled out from the base. Although they can be removed without the need for a tool, the insertion directions of the flow path connecting means and the electrical connecting means are different, so that there is an inconvenience that each connection must be made separately. Originally, in order to solve such a problem, as shown in JP-A-8-219992, the electrical connector and the fluid connector were arranged in the back side of the housing case in a direction parallel to the insertion / removal direction of the unit. Of the same direction,
In addition, a structure that enables electrical and fluid connection when the unit is inserted by arranging the fluid connectors to be engaged with each other before the electrical connector may be considered. However, there is a problem that cost increases due to an increase in man-hours. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fluid connection unit and an electric connection unit by inserting and removing a unit without requiring high positional accuracy in the arrangement of connectors. It is an object of the present invention to provide a novel rack-mounted gas alarm device that can be simultaneously attached and detached.

[0005]

In order to achieve the above object, according to the present invention, at least a pump unit and a gas sensor unit are detachably provided on a base via connection means, and the base is detachable. In the gas alarm device with a built-in rack housed in a flexible outer case, the pump unit and the fluid connecting portion and the electrical connecting portion constituting the connecting means of the gas sensor unit are inserted and removed in a direction perpendicular to the front surface of the outer case. Direction and fluid connection,
And one of the connectors constituting each of the electrical connection portions is mounted so as to be slightly movable.

[0006]

[Function] By moving the fluid connection part and the electrical connection part of the gas sensor unit and the pump unit, which are frequently maintained, in the same direction, the connector constituting the fluid connection and the electrical connection corresponds to the position of the mating connector. And move slightly to engage.

[0007]

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 a pump unit 1, a gas sensor unit 2, a flow meter unit 3, and a signal processing unit 4 are detachably accommodated in a chassis 5, and an outer case 1
7 is detachably set on a base 18 which can be attached and detached.

The exterior case 17 is provided with a cover 8 on which a display 6 and operation buttons 7 of the signal processing unit 4 can be operated and a display surface 3a of the flow meter unit 3 on the front surface which is an exposed surface when housed in a rack. Is provided, and is fixed to the fixing projection 5a of the chassis 5 at the lower front portion by a screw 10 with a gripping portion.

FIGS. 2 and 3 show a state in which the outer case 17 is removed, respectively. The pump unit 1, the gas sensor unit 2, and the flow meter unit 3 are pushed in by levers 11, 12, and 13, respectively. Alternatively, a fluid connector and an electrical connector are arranged so as to be movable to the front side by a drawer.

As shown in FIGS. 4A to 4C, the pump unit 1 has a solenoid 20, a lever 21 which vibrates by receiving an alternating magnetic field thereof, and one surface intermittently pressed by the lever 21. The diaphragm 22 made of an elastic material is accommodated in a frame 23. Frame 2
3 has a terminal 24 for supplying alternating power to the solenoid 20, and a suction port 22 for the diaphragm 22.
a and 22b are formed to protrude.

As shown in FIG. 5, the sensor unit has a sensor main body 30 and a sensor cover 33 having a concave portion 32 which hermetically engages a gas inlet 31 of the sensor main body.
It consists of: The sensor cover 33 has suction and exhaust ports 33 a and 33 b extending in the direction of insertion and removal of the connector 34 of the sensor body 30, and has one end opened in the recess 32.

As described above, the intake and exhaust ports 22a, 22
Since the b, 33a, 33b, the terminal 24, and the connector 34 extend in the same direction, the fluid connectors 40, 41 and the electrical connector 4 are attached to the chassis 5 as shown in FIG.
By arranging 2 so that the opening of the receiving portion faces the front side, the flow path connection and the electrical connection are completed simultaneously.

FIG. 6 shows a flow meter unit comprising a transparent tube 50 constituting a float type flow meter main body and an inlet 51 which seals upper and lower openings thereof and is orthogonal to the axial direction of the transparent tube 50.
a, and connectors 51 and 52 formed with an exhaust port 52a
The intake port 51a and the exhaust port 52a are fixed so as to be located in the same plane, and are configured to be able to be inserted and removed by moving in the front-rear direction, that is, the direction perpendicular to the front surface of the outer case. In addition, the code | symbol 53 in a figure shows a float.

The pump unit 1, the gas sensor unit 2, and the flow meter unit 3 are connected to each other by a flow path, and then connected to a connector 60 connected to the fluid connectors 15, 16 of the base 18 via a flexible connecting member. It is connected.
The connector 60 has a distal end 61 as shown in FIG.
a, 62a are formed of tapered tube portions 61, 62, and a main body portion 64 having a flat portion 63 on a surface facing the chassis 5, and the flat portion 63 has a claw 65 and a projection for preventing falling off. 66 are formed. Note that reference numerals 67 and 68 in the drawing denote connection portions with the above-described flexible connection members.

With such a structure, when the chassis 5 is pushed in using the upper surface of the base 18 as a guide, the distal ends 61a and 62a of the connector 60 are connected to the fluid connector 15 of the base 18,
16 contacts the receptacle 15a (16a) of the
The main body 64 moves so as to face the positions 5 and 16. The circuit board 70 constituting the signal processing unit 4
The connector 71 forming an electrical connection portion formed at the tip of
Engagement with the connector 72 fixed to the base 18 completes the fluid and electrical connections. The connector forming the electrical connection portion can be fixed because it can be mounted with relatively high positional accuracy, but the connector 72 fixed to the base 18 can be slightly movably mounted similarly to the fluid connector. You can also.

When the concentration is detected by forcibly sucking the gas by the pump unit and supplying the gas to the gas sensor unit, the output of the gas sensor unit largely depends on the flow rate of the flowing gas. For this reason, it is necessary to detect the flow rate by the flow meter unit 3 and adjust the power to the drive source of the pump so that the flow rate becomes a predetermined flow rate.

In order to maintain a constant flow rate by such a float type flow meter unit, two optical sensors are arranged in the vertical direction, and the power of the drive source is set so that the float is located between the two sensors. Has been adjusted. However, there is a problem that a plurality of sensors for float detection are required, which complicates the structure and increases the cost.

FIG. 7 shows an embodiment of a flow control device which solves such a problem. A single float detecting means 54, for example, is provided at the position of the float 53 corresponding to the flow to be maintained. An optical sensor is arranged, and the power of the solenoid 20 of the pump unit 1 is adjusted by the flow control means.

The flow control means 55 performs suction at such a large flow rate that the float 53 reaches the upper end of the pipe 50 when the pump unit 1 is started. This allows the float 53
Rises to the upper end through the float detecting means 54.
After the detection of the passage of the float 53 by the float detecting means 54, the control means 55 gradually reduces the power supplied to the solenoid 20 until the detection signal is output again from the float detecting means 54, and thereafter maintains this state. .

When the float 53 is located in a certain area, the output of the detection signal fluctuates, but the float detection means 54 is capable of detecting the detection signal. , The intensity of the signal from the float detecting means 54 decreases. In this state, the power supplied to the solenoid 20 is changed by a small amount so that the float does not deviate from the detection area in a direction in which the signal from the float detection means 54 increases.

On the other hand, the flow rate fluctuates greatly due to external factors, and the float 53
Is deviated and the signal disappears, the drive power to the solenoid 20 is controlled so that the flow rate becomes constant by the same process as that at the time of startup. Hereinafter, by repeating such steps, the flow rate can be kept constant by the single float detecting means 54. If the float 53 cannot be detected even when the power supplied to the solenoid 20 is maximized, the pump unit 1 may be out of order or the flow path may be blocked, so that an alarm is issued and the inspection is prompted. .

FIG. 8 shows an embodiment of the lever 12 for detaching the sensor unit from the connecting means of the chassis 5. The lever 12 has a pressing portion 12 protruding to the front side.
The chassis 5 is formed in a substantially U-shape provided with an a.
Mounted on The lever 12 is connected to the spring 12
e (FIG. 6), the back portion 12f is constantly urged to be vertical.

The pressing rod 12c is provided so as to abut slightly above the connector 34 of the sensor body 30. The shaft 12b and the pressing rod 12c are
g, 12h. Then, one side wall portion 12f and the width W on the back side of the sensor unit 2 from now on
And the middle part 12j formed at a position corresponding to the position is regulated to the position on the back side.

With this configuration, when the sensor unit 2 is inserted from the front side of the chassis 5, the rear area is regulated by the side wall 12 f and the intermediary part 12 j, and the bottom surface is regulated by the upper surface of the chassis 5. It moves to a position facing 42 and is securely engaged with them.

On the other hand, when taking out the sensor unit 2, when the pressing portion 12a is pressed by a finger against the spring 12e,
The lever 12 rotates about the shaft 12b to restrict the rear surface of the sensor unit 2 to the side wall portion 12f and the intermediary portion 12j, and push the sensor unit 2 toward the front surface while restricting the bottom surface by the chassis 5.

[0026]

As described above, according to the present invention,
The fluid connection portion and the electrical connection portion can be inserted and removed by moving in the same direction without mounting the connector with high positional accuracy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a gas alarm device incorporated in a rack of the present invention.

FIG. 2 is a perspective view showing the same device with a cover case removed.

FIG. 3 is a front view showing the same device with a cover case removed.

FIGS. 4A to 4C are a perspective view, a front view, and a side view, respectively, showing an embodiment of a pump unit of the above device.

FIGS. 5A and 5B show an embodiment of a gas sensor unit, and FIGS. 5B and 5C show an embodiment of a gas sensor main body and a sensor cover which constitute the gas sensor unit of the above device, respectively. FIG.

FIG. 6 is a diagram showing a connection state of each unit in the above device.

FIG. 7 is a diagram showing an embodiment of a flow meter unit and a flow control device using the same.

FIG. 8 is a view showing one embodiment of a lever for taking out a sensor unit.

FIGS. 9A to 9C are a front view and a sectional view, respectively, showing an embodiment of the fluid connector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump unit 2 Gas sensor unit 3 Flow meter unit 4 Signal processing unit 5 Base 7 Operation button 11, 12, 13 Lever 20 Solenoid 21 Lever 22 Diaphragm 23 Frame 24 Terminal 30 Sensor main body 31 Gas inlet 33 Sensor cover 34 Connector 40, 41 Fluid connector 42 Electric connector 50 Transparent tube 51, 52 Connector 53 Float 54 Float detection means 55 Flow control means 60 Fluid connector

Continued on the front page F term (reference) 2F030 CA02 CC11 CF07 2G060 AA01 AE19 HD00 5C086 AA02 DA07 GA20

Claims (1)

[Claims] At least a pump unit and a gas sensor unit are detachably provided on a base via connection means,
In the gas alarm device incorporated in a rack in which the base is accommodated in a detachable outer case, the pump unit and a fluid connection unit constituting a connection unit of the gas sensor unit, and an electric connection unit are provided on a front surface of the outer case. A rack-incorporated gas alarm device in which a direction perpendicular to the direction of insertion and withdrawal is set as the insertion / removal direction, and one of the connectors constituting each of the fluid connection portion and the electrical connection portion is slightly movably mounted.