JPH08241475A - Fire detector - Google Patents

Abstract

PURPOSE: To provide the fire detector of high sensitivity which is provided with a connection means and an airflow detector which are superior in mass- productivity, field workability, and maintainability and consist of components having a high performance and a high reliability. CONSTITUTION: A suction fan 91, a filter 5, and a fire detector 30 are stored in a casing 1, and cylindrical connection parts are provided on suction sides and discharge sides of the suction fan 91, the filter 5, and the fire detection part 30, and at least connection parts on the discharge side of the filter 5 and the suction side of the fire detection part 30 and those on the discharge side of the fire detection part 30 and the suction side of the suction fan 91 are connected by flexible tubes 131 and 132 provided with soft and elastic pipe joints in both end parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detection device, and more particularly, to the early occurrence of a fire in a return airflow in which forced air conditioning is performed, such as in a clean room or a computer room in a semiconductor device manufacturing factory. The present invention relates to a high-sensitivity fire detection device capable of detecting fire.

[0002]

2. Description of the Related Art For example, in a computer room, for example, a narrow ventilation room with a low ceiling is generally installed under the floor where a computer and ancillary equipment are installed, and an air conditioner is used to circulate the air in the room through the ventilation room under the floor. , Has been cleaned.

Abnormally generated smoke in such computer equipment or from ancillary equipment is diluted by the return air flow and becomes thin, and the diffused abnormally generated smoke is affected by the flow of the return air flow and does not show a certain behavior. As such, the phenomenon is different in many ways from normal indoor smoke. For this reason,
In such a place, it is difficult to capture smoke with a normal fire detector, and a fire detection device with extremely high sensitivity is required.

As such a fire detection device, for example,
As shown in Japanese Patent Publication No. 5-36836, a sampling tube is provided which is formed of a long tube and has a distal end portion closed and a plurality of suction small holes along the longitudinal direction thereof. There is a fire detection device configured to detect a fire by allowing air containing smoke, which is generated from a fire source and is sucked from a suction small hole by a suction fan, to reach a fire detection unit provided in the.

Further, recently, in order to effectively use the computer room, as shown in FIG. 26, the fire detecting device including the sampling pipe 204, the fire detecting section 205 and the like as described above is provided under the floor of the computer room 201. Aeration chamber 2
It is installed in 02 to detect smoke contained in the return air flow and to detect the occurrence of fire at an early stage. In addition, 206 is an air conditioner, 207 is a computer and ancillary equipment, and 208 is a central control room.

FIG. 27 is a perspective view showing an example of a fire detection device installed in the above-mentioned place. In the figure, 2
Reference numeral 10 denotes a housing in which a smoke detection unit and the like are housed. Reference numeral 211 is a cover of the housing 210. Reference numeral 212 denotes a sampling tube connected to a sampling suction port 213 provided in the housing 210. Both ends are closed and a plurality of suction small holes (not shown) are provided along the longitudinal direction, and a suction fan 218 is provided. The air sucked from the sampling tube 212 by the filter 214 is sent to the optical smoke detector 216 through the hose 215 after the dust and the like are removed by the filter 214, and is discharged to the outside through the hose 217. In addition, 21
Reference numeral 9 is an inlet (outlet) for power lines, signal lines and the like, and 220 is a terminal block. Then, when smoke is detected by the smoke detection unit 216, the signal is sent to a monitoring panel or the like provided in the central control room via a shielded cable, and necessary measures such as issuing an alarm are taken.

[0007]

The above-mentioned fire detection device has been well-received because of its extremely high sensitivity (about 1000 times that of a normal smoke detector) and high performance, but it has hitherto been relatively produced. Since the quantity was small, I didn't use much in terms of mass production, and rather used a lot of handmade processing methods. For this reason, the productivity is low, and in particular, even though it is installed in a narrow ventilation room under the floor, the workability at the site and the maintainability have not been taken into consideration so that it has been difficult to reduce the cost.

The present invention has been made to solve the above problems, and is provided with a high-performance and highly reliable connecting means of components and an air flow detector which are excellent in mass productivity, field workability and maintainability. The purpose is to obtain a highly sensitive fire detection device.

[0009]

[Means for Solving the Problems]

(1) In the fire detection device according to the present invention, a suction fan, a filter, and a fire detection unit are housed in a housing, and a cylindrical connection portion is provided on the intake side and the exhaust side of these suction fan, filter, and fire detection unit. , At least the exhaust side of the filter and the intake side of the fire detection part, and the connection part of the exhaust side of the fire detection part and the intake side of the suction fan were connected with flexible tubes equipped with flexible and elastic pipe joints at both ends. It is a thing.

(2) In the fire detection device of (1) above, the tip of the connecting portion is formed in a bamboo shape, or a ring-shaped projection is provided on the outer periphery near the tip. (3) Further, the flange portion is provided substantially at the center in the height direction of the pipe joint. (4) Furthermore, the suction side joint attached to the housing and the intake side connecting portion of the filter are connected by a flexible tube having a flexible and elastic pipe joint at both ends.

(5) Further, in the fire detecting device according to the present invention, an opening is provided in the connecting portion provided on the exhaust side of the fire detecting portion, and the air volume detector is screwed to the opening through a packing. Is.

(6) Further, the air volume detector of the above (5) has a sensor holder consisting of a substrate and a cylindrical portion, and a printed circuit board on which the air volume sensor is mounted, and the air volume sensor is inserted into the cylindrical portion. It is configured such that the cylindrical portion is projected and the cylindrical portion is inserted into the opening provided in the connecting portion of the fire detector, and the board of the sensor holder and the printed board are integrally screwed to the connecting portion.

[0013]

[Function] The intake side of the filter and the suction side joint to which the sampling pipe is connected are connected by a pipe, and the exhaust side of the filter, the intake side of the fire detection unit and the exhaust side of the fire detection unit and the intake side of the suction fan are connected. A flexible tube having flexible and elastic pipe joints at both ends is connected, and an exhaust side and an exhaust side joint of the suction fan are connected by the same flexible tube as described above. Finally, cover the opening of the housing with a screw and fix it.

The fire detection device including the sampling pipe and the fire detection unit as described above is installed, for example, in a narrow ventilation chamber provided under the floor of a computer room and in which air recirculates. Then, the air sucked from the sampling tube by the suction fan is dust-removed by the filter and sent to the fire detection unit, is discharged through the slit hole of the slit plate of the fire detection unit, and is discharged through the suction fan to the exhaust side joint. Is discharged to the ventilation chamber.

During this time, the light of the light emitting portion is projected from the opening provided in the cylindrical portion in the optical chamber, and is always limited to the slit plate having a small slit hole so that the light receiving portion does not receive the light. Has become. If smoke is mixed in the air sucked from the sampling tube, the light emitted from the light emitting unit is diffusely reflected by the smoke, and the light receiving unit receives the light. An electric signal corresponding to the amount of received light is output. As a result, it is possible to detect that the recirculating air contains smoke, and thus a fire has occurred. During this period, the air volume detector detects the amount of air flowing through the exhaust joint to detect whether or not the air normally flows in the fire detection unit.

[0016]

1 is a plan view showing a fire detecting device according to an embodiment of the present invention with a cover removed, and FIG. 2 is a plan view, a front view and a side view showing a state in which internal equipment is removed. In the figure, 1 is a housing with an open upper portion, 5 is a filter for cleaning the air sucked from a sampling tube (not shown), 30 is a fire detection unit consisting of an optical system, and 91 is a suction fan. Reference numeral 105 is a suction side joint to which a sampling tube is connected, 115 is an exhaust side joint which is connected to the suction fan 91 and discharges air to the outside, 131, 13
Reference numerals 2 and 133 are connection hoses that form a flexible tube, 131 is a first connection hose that connects the filter 5 and the fire detection unit 30, and 132 is a second connection hose that connects the fire detection unit 30 and the suction fan 91. 133 is a third connecting hose that connects the suction fan 91 and the exhaust side joint 115. Examples of each of the above components will be described in detail below.

A peripheral edge of the opening of the housing 1 is bent inward to form a flange portion 2, and the flange portion 2 is provided with a plurality of screw holes 2a. Reference numeral 3 denotes a cover (see FIG. 3), which has screw insertion holes corresponding to the screw holes 2 a of the flange portion 2. 3a is a packing, and 4 is a mounting metal fitting provided on the lower end portions of both side walls for mounting the housing 1 on the floor surface of the ventilation chamber or the like. In order to attach the cover 3 to the case 1 as described above, as shown in FIG. 3, the cover 3 covers the opening of the case 1 and is placed on the flange portion 2.
A screw is inserted through the screw insertion hole and screwed into the screw hole 2a of the flange portion 2 to be fixed. It should be noted that the packing 3a may be omitted, and if necessary, an inverted L-shaped mounting member may be fixed to the upper end of the outer wall in the longitudinal direction of the opening, and the cover 3 may be fixed to this mounting member. Good.

Next, as shown in FIGS. 4 and 5, the filter 5 comprises a filter cover 6 made of a synthetic resin molding and a filter mount 13. The filter cover 6 has an opening 7 formed in a substantially cylindrical shape having a large diameter and having a bottom, and is concentric with the ventilation hole 8 provided in the bottom and has a ring-shaped projection 1 on the outer periphery.
A connecting portion 9 which is a connecting portion to which a first connecting hose 131 described later is connected is provided. In addition, a plurality of elastic locking pieces 11a and 11b (having two locking pieces 11a and 11b facing each other in the drawing) are provided on the outer periphery of the opening 7 side and have a locking claw 12 at the tip. Are provided at the same time).

The filter mount 13 has a vent hole 1 at the center thereof.
5, a disk-shaped front plate 14 having a ring-shaped engaging portion 16 provided on the outer peripheral front edge, and a ring-shaped projection 18 on the outer periphery, which are provided concentrically with the ventilation hole 15. A connecting portion 17 which is connected to a suction side joint 105 described later by a pipe 29 through a pipe joint made of a soft synthetic resin (see FIG. 1) and a rear portion of the front plate 14 (opposite to the connecting portion 17) are projected. A plurality of filter mounting plates 19 and a flange portion 20 provided at the base of the front plate 14 and having a lower portion extending rearward to form mounting legs 21. As shown in FIG. 5 (a), cam portions 16a, 1 constituting the releasing means projecting outward at a plurality of locations (the case where they are provided at two locations facing each other in the figure)
6b are formed.

As shown in FIG. 6, the filter 5 comprising the filter cover 6 and the filter mounting base 13 as described above has the filter mounting base 13 having the filter element 22 mounted on the filter mounting plate 19 and the opening portion 7. From the inside into the filter cover 6. At this time, the flange portion 20 of the filter mount 13 abuts on the peripheral edge of the opening 7 of the filter cover 6, and the locking claw 12 of the filter cover 6 locks the locking portion 16 of the filter mount 13. Cover 6
And the filter mount 13 are integrally connected.

When the filter cover 6 is removed from the filter mount 13, the filter cover 6 is rotated so that the locking pieces 11a and 11b are placed on the cam portions 16a and 16b provided on the locking portion 16 of the filter mount 13. Position it. As a result, the locking pieces 11a and 11b open outward and the locking between the locking claw 12 and the locking portion 16 is released. Therefore, the filter cover 6 is pulled backward (to the right in FIG. 6) or the filter cover 6 is pulled. The filter cover 6 can be removed from the filter mount 13 by pulling the mount 13 forward.

Referring again to FIGS. 1 and 2, reference numeral 25 denotes a substantially S-shaped filter fitting which is fixed to the floor plate of the housing 1 so that the position of the filter can be adjusted back and forth. The suction side joint 105 side is located between the floor plate and the suction side joint 105 side. A gap g is formed, and the gap g is sized so that the mounting leg 21 provided on the filter mounting base 13 of the filter 5 can be inserted. Reference numeral 26 denotes the filter 5 and the housing 1
The L-shaped filter holding metal fitting for holding the filter 5 and preventing the vibration of the filter 5 is provided with a hole 27 into which the connecting portion 9 of the filter 5 is inserted, as shown in FIG. The horizontal piece is provided with two elongated holes 28a and 28b, and the housing 1 is formed by utilizing the elongated holes 28a and 28b of the horizontal piece.
It is slidably fixed to the floor plate of.

In order to mount the filter 5 as described above on the housing 1, first, the filter holding metal fitting 26 is loosened and slid backward. Then, the connecting portion 9 of the filter 5 is inserted into the hole 27 of the filter holding metal fitting 26, and the mounting leg 2
1 is inserted into the gap g of the filter fitting 25. At this time, the mounting leg 21 may be fixed by the filter fitting 25. Then, the filter 5 is securely attached to the housing 1 by advancing the filter holding metal fitting 26 and fixing it with a screw. When removing the filter 5, the reverse operation to the above may be performed.

According to the present invention, as described above, the hole 2 of the filter holding metal fitting 26 capable of sliding the connecting portion 9 of the filter 5 back and forth.
7, the mounting leg 21 can be easily mounted on the housing 1 by fitting the mounting leg 21 into the filter fitting 25, and the filter holding fitting 26 can be retracted to rotate the filter cover 6 with one hand. Lever locking pieces 11a, 11b
The filter cover 6 can be easily removed from the filter mounting base 13 by riding on the cam portions 16a and 16b of the filter mounting base 13 and releasing the lock. It becomes easy, and the workability on site and the maintainability can be greatly improved. Especially when the fire detection device is installed in the ventilation room under the floor where the space is small and the work is troublesome, the filter element can be replaced only by rotating the filter cover without removing the screw. Maintenance can be performed in a short time.

The structure of the fire detection unit 30 is shown in FIG. 31
Is a case of the detection unit, and is provided with inverted L-shaped fittings 32a and 32b at both ends in the longitudinal direction. Reference numeral 33 denotes a detection unit main body in which a cylindrical optical chamber 35 is attached. For example, a metal material having a lateral width slightly smaller than the width of the detection unit case 31 and a length substantially equal to that of the cylindrical optical chamber 35 is used. A first printed circuit board of a light source device, which will be described later, is attached to the plate-shaped member in the vertical direction. Further, by providing a similar plate-shaped member below the optical chamber 35, the cylindrical optical chamber 35 is securely held in the detection unit case 31 without rattling. Optical room 3 as smoke detection space
As shown in FIGS. 9, 10 and 11, reference numeral 5 denotes a pair of semi-cylindrical optical cases 37a and 37b in which a cylinder is divided into two.
And a plurality of slit plates 45, a lens 52 and a light receiving element 54a are housed therein, and openings at both ends are formed by an amplifier cap 53 and an exhaust cap 57 which are closing members. It is blocked.

On the inner peripheral surfaces of the semi-cylindrical optical cases 37a and 37b, a plurality of fitting grooves 38 having the same width are provided at intervals adjusted so as to efficiently capture smoke for mounting the slit plate 45. Is provided, and at least one of the optical cases (for example, 37b) is provided with a projection 39 at the bottom of the fitting groove 38. A fitting groove 38a is wider than a fitting groove 38 into which a lens holder 50 described later is fitted. 40a, 40b, 41a, 41b are optical cases 37
Locking claws provided at both ends of a and 37b. Reference numeral 42a denotes a plurality of convex portions projecting from one longitudinal edge of one optical case (for example, 37b), and 42b a plurality of concave portions provided at the other edge, and the other optical case (for example 37a). A plurality of concave portions to which the convex portions 42a are fitted and a plurality of convex portions (not shown) to be fitted to the concave portions 42b are provided on both edges in the longitudinal direction of the optical cases 37a and 37b. The cylindrical portion 36 is formed by coupling.

When connecting the optical cases 37a and 37b, the projections 42a and the recesses 42b provided on the optical cases 37a and 37b may be fitted to each other, so that the positioning is easy and the two can be surely connected to each other. There is no play. The convex portion 42a and the concave portion 42b may be provided on either of the optical cases 37a and 37b, or the convex portions 42a may be formed on both edges of each of the optical cases 37a and 37b.
And the recess 42b may be provided respectively. 43 is an air introducing hole provided in one optical case (for example, 37a), and 44 is a light introducing hole which is also an opening.

Reference numeral 45 is a thin disc-shaped slit plate, which is shown in FIG.
As shown in FIG. 11, a circular slit 46 having a different size depending on the installation position is provided at the center (FIG. 11).
reference). Reference numeral 47 denotes a ring-shaped slit plate holder, which is shown in FIG.
As shown in FIG.
Is formed to have a width (thickness) that can be fitted to the front surface, and a step portion 48 to which the slit plate 45 is fitted and held is provided on the front surface side, and a projection 39 of the optical case 37b is provided on the lower end portion on the rear surface side. A fitting recess 49 is provided. In addition, this slit plate 4
As shown in FIG. 11, the light emitting element 5 has a small slit diameter on the light receiving element side and a large slit diameter on the other side so that light from the light emitting element does not enter the light receiving element. I have to. Further, the flow velocity of the air sampled by the slit plate 45 is set to an appropriate value.

Reference numeral 50 designates a lens holder having a through hole 50a in the center thereof. As shown in FIG.
The width (thickness) is formed so that it can be fitted into the fitting groove 38a of 37b, and the mounting screw 51 of the lens 52 is provided on the rear portion. Reference numeral 53 denotes a bottomed cylindrical amplifier cap having a printed circuit board 54 on which a light receiving element 54a is mounted and a preamplifier (not shown) or the like is formed. As shown in FIG. 15, the engaging claws 40a, 40b of the optical cases 37a, 37b are formed on the upper and lower sides of the opening side so as to fit into the end portions.
Are provided with locking holes 55a and 55b. 5
Reference numeral 6 is a light receiving element which is a light receiving portion, and 54a is a lead wire take-out groove for taking out a lead wire of a preamplifier or the like.

Reference numeral 57 denotes a substantially bottomed cylindrical exhaust cap which constitutes a closing member, and the opening is formed to have a size capable of being fitted into the end of the cylindrical portion 36. As shown in FIG. The locking claws 4 of the optical cases 37a and 37b are provided on the upper and lower sides of the section.
Locking holes 58a and 58b for locking 1a and 41b are provided. Then, the bottom portion is unevenly formed so as to diffusely reflect the light of the light emitting element and attenuate the light. Reference numeral 59 is an air exhaust hole.

In order to assemble the optical chamber 35 consisting of the above-mentioned respective parts, first, the slit plates 45 are fitted into the step portions 48 of the slit plate holder 47, and if necessary, they are fixed by adhering them with an adhesive or the like. To do. Next, the fitting groove 3 of the optical case (37b in this embodiment) provided with the protrusion 39 is provided.
The slit plate holder 47 having the slit plate 45 with a small slit diameter on the light receiving element 54a side of
The slit plate holders 47 each having a slit plate 45 with a large slit diameter are fitted to the 7 side, and the lens 52
The lens holder 50 mounted with is fitted into the fitting groove 38a. At this time, since the slit plate holder 47 is positioned by fitting the concave portion 49 thereof into the projection 39 of the optical case 37b, the slit plate holder 47 will not be erroneously fitted back and forth and will not rattle. And the other optical case 3
7a is overlaid on the optical case 37b, and the concave and convex portions thereof are fitted into the convex portions 42a and the concave portions 42b of the optical case 37b, and the optical case 37a is formed on the slit plate holder 47.
The fitting groove 38 is fitted and both the optical cases 37a and 37b are integrally joined to form a cylindrical portion 36 (see FIG. 11).

Next, the light receiving element 54a, the preamplifier, etc. are accommodated in one end of the cylindrical portion 36, and the lead wire is taken out from the lead wire take-out groove 56 and sealed with silicon rubber or the like. The amplifier cap 53 is fitted, and the locking holes 55a and 55b are locked by the locking claws 40a and 40b provided at the ends of the cylindrical portion 36 to be closed. In addition, the cylindrical portion 36
The exhaust cap 57 is fitted to the other end of the
a and 58b are locking claws 41a provided at the end of the cylindrical portion 36,
Lock at 41b. As a result, the assembly of the optical chamber 35 as shown in FIG. 11 is completed. As a result, both ends of the cylindrical portion 36 are reliably closed, and there is no risk that the amplifier cap 53 and the exhaust cap 57 will fall off.

According to the present invention, as described above, the cylindrical portion 36 has two parts.
Fitting grooves 38 are provided in the divided optical cases 37a and 37b, and predetermined slit plates 45 are provided in the fitting grooves 38, respectively.
Since the optical cases 37a and 37b are joined together by fitting, the slit plate 45 is not mistakenly inserted,
If it is wrong, it can be easily confirmed by dividing the cylindrical portion 36, so that the workability can be greatly improved, and the inside of the cylindrical portion 36 can be easily cleaned. That is,
In the work of making the optical chamber 35 by incorporating the slit plate 45 into the optical cases 37a and 37b,
The interval of the fitting groove 38 of 37b is set in advance so that smoke can be optimally captured, and the interval between the slit plate 45 and the slit plate 45 is always set correctly. Also,
The slit plate 45 is a semi-cylindrical optical case (for example, 37
Since they are successively fitted into the fitting groove 38 of a), the work can be carried out while surely confirming that the slit plate 45 having a small slit diameter comes to the light receiving element 54a side. The other optical case 3 on top
Before the 7b is attached, it is possible to confirm the final stage in which all the slit plates 45 are fitted.
It is possible to surely prevent the mistaken insertion of the smoke, and thus the smoke can be accurately detected. Further, since the fitting method is adopted, even if the slit plate 45 is inserted incorrectly, the replacement work can be easily performed, and as a result, the number of assembling steps can be reduced.

Referring again to FIG. 8, reference numeral 60a denotes an air intake joint made of a hard synthetic resin or a metal material, which is screwed into a screw hole 33a provided in the detection unit main body 33 so as to face the air introduction hole 43 of the optical chamber 35. An exhaust joint 60b is made of a hard synthetic resin or a metal material and is screwed into a screw hole 33b provided in the detection unit body 33 so as to face the exhaust hole 59 (provided in the exhaust cap 57) of the optical chamber 35. An example thereof is shown in FIG. Intake joint 60a
Has a through hole 61 in the center and a detector body 33 at the bottom.
Is provided with a screw 62 that is screwed into the screw hole 33a provided in the main body 63a, the main body 63a having a larger diameter than the screw 62, and the connecting portion 63b having a smaller diameter than the main body 63a and having a tip portion formed in a bamboo shoot 63c. And a step portion 64 formed between the two. The exhaust joint 60b is also the intake joint 6
Although it has almost the same structure as 0a, a flat portion 65 for mounting an air flow detector 70 described later is formed on the outer wall surface, and this flat portion 65 has an air flow sensor insertion hole 66 communicating with the through hole 61. Are provided (see FIG. 18).

FIG. 18 shows an embodiment of the air volume detector 70.
Reference numeral 71 is a printed circuit board on which a preamplifier circuit and the like (not shown) is formed, and a lead wire of an air flow sensor 72, which is, for example, a thermistor, is connected to the printed circuit board. A T-shaped sensor holder 73 is composed of a substrate 74 and a cylindrical portion 75. The air volume sensor 72 mounted on the printed substrate 71 is inserted into the cylindrical portion 75 from the substrate 74 side, and the printed substrate 7 is inserted via a packing 76.
1 is brought into contact with the substrate 74, and the cylindrical portion 75 is filled with, for example, silicon rubber 77 to fix the lead wire. Then, the air flow sensor 72 and the cylindrical portion 75 of the sensor holder 73.
Is inserted into the air flow sensor insertion hole 66 of the exhaust joint 60b, and the board 74 is brought into contact with the flat surface 65.
1, the packing 76 and the substrate 74 are integrated and fixed to the exhaust joint 60b with screws. At this time, the air flow sensor 7
2 is located in the through hole 61 of the exhaust joint 60b.

The present invention, as described above, uses the air volume sensor 72.
Since the printed circuit board 71 on which is mounted together with the sensor holder 73 via the packing 76 is screwed to the flat portion 65 of the exhaust joint 60b, the mounting is easy and the airtightness can be secured. Replacing the sensor 72 is also very easy.

In FIG. 8, reference numeral 80 denotes a light source device, an embodiment of which is shown in FIG. Reference numeral 81 is a first printed circuit board provided with a circuit (not shown) for causing the light emitting element to emit light,
Pins 82a, 8 attached to the detector body 33 and made of a conductive material and connected to a circuit pattern (not shown)
2b and 82c are erected. A second printed circuit board 83 is smaller than the first printed circuit board 81 and corresponds to the pins 82a to 82c of the first printed circuit board 81.
4a, 84b, 84c are provided, and these pin holes 84a to 84c are connected to each other by a circuit pattern (not shown), and a light emitting element (a xenon lamp having a large light emission amount is shown in the drawing is a light emitting portion. There is, however, other light emitting element may be used.) Through hole 8 into which lead wire 86 is inserted and connected
5a, 85b, 85c are provided.

The light source device 80 as described above includes the light emitting element 8
Pin hole 84a of second printed circuit board 83 on which No. 6 is mounted
To 84c are the pins 82a to 8 of the first printed circuit board 81.
The first printed circuit board 81 is attached to the detector body 33 by inserting it into the 2c and electrically and mechanically connecting it. At this time, the light emitting element 86 is provided in the detector main body 33 so as to face the light introduction hole 44 of the optical chamber 35, and faces the opening 33c sealed with the transparent conductive film 87 for maintaining airtightness. And located. The light emitting element 86 has the locking portion 88 a locked to the first printed circuit board 81 and the lower surface of the opening portion 33.
It is covered with a cover 88 as shown in FIG. 20 which is screwed around c by a packing to protect the light emitting element 86 and prevent leakage of light. In addition, in FIG.
Reference numeral 9 denotes a connector provided on the top plate of the detection unit case 31 to take in (take out) a power supply line, a signal line and the like into the optical chamber 35.

As described above, according to the present invention, the opening 33c provided in the detection unit main body 33 is sealed with the transparent conductive film 87, and the cover 88 is fixed by screwing. Therefore, the cover 88 can be attached and detached. It is extremely easy and the sealing performance is not impaired. Further, when the xenon lamp 86 is used as the light emitting element, the xenon lamp 86 has a lifespan, and therefore it must be replaced every predetermined period. However, when the xenon lamp 86 is replaced, the xenon lamp 86 is mounted. Then, the second printed circuit board 83 is melted with solder to form the pins 82a to 82 of the first printed circuit board 81.
The new second printed circuit board 86 on which the xenon lamp 86 is mounted can be attached to the pins 82a to 82c of the first printed circuit board 81, so that the replacement work is very easy and the first printed circuit board is removed. It does not adversely affect the light emitting circuit provided on the substrate 81.

The fire detector 30 constructed as described above is
As shown in FIG. 21, the mounting brackets 32a provided on both ends,
The horizontal piece 32b is mounted on the housing 1 by placing the horizontal piece on the upper horizontal piece of the U-shaped fixing metal fittings 90a and 90b whose lower horizontal piece is fixed to the bottom plate of the housing 1 and screwing. The fixing fittings 90a and 90b may be substantially Z-shaped or S-shaped. Further, since the fire detection unit 30 does not come into contact with the bottom of the housing 1 and floats slightly,
It is not easily affected by vibration when it is installed on the floor.

According to the present invention, as described above, the upper horizontal piece of the U-shaped fixing metal fittings 90a, 90b in which the lower horizontal piece is fixed to the bottom plate of the housing 1 is provided on the upper horizontal piece, and the lower horizontal piece is fixed to the detection case. Three
Reverse L-shaped mounting brackets 32a, 32b mounted on both sides of 1
Since the horizontal piece of No. 1 is placed and screwed, the fire detection unit 30 can be installed in the narrow housing 1 without putting the hand deeply or supporting the fire detection unit 30 with the hand. It can be attached to the housing 1 at the top. Therefore, the attachment / detachment work is easy, and the workability on site and the maintainability can be greatly improved.

Referring again to FIGS. 1 and 2, reference numeral 91 is a suction fan having an intake port 92 and an exhaust port 93 each having a ring-shaped projection at its tip, and as shown in FIG. 22, mounting pieces 95a and 95b are provided on both sides. Is formed to have a substantially convex shape, one mounting piece 95a is provided with a screw insertion hole 96, and the other mounting piece 95b is provided with a U-shaped cutout portion 97 to form the housing 1 It is mounted on a mounting bracket 94 fixed to the bottom plate of the above, and a terminal plate 98 is mounted on the suction fan 91. 100 is a mount 1 fixed to the bottom plate of the housing 1.
01 is a terminal block provided on.

Reference numeral 105 denotes a suction side joint made of, for example, a metal material, and as shown in FIG.
06 is penetrated. A sampling pipe connection portion 108 to which a sampling pipe (not shown) is connected is provided on one side of the flange 107 provided on the outer periphery of the substantially central portion in the longitudinal direction, and an internal thread is formed on the inner peripheral surface thereof. 109
Is provided so that either a fitting type or a screw type sampling tube can be connected. Further, a filter connecting portion 110 having a diameter smaller than that of the sampling pipe connecting portion 108 is provided on the other side of the flange 107, and a tip end portion thereof is formed in a large-diameter frusto-conical shape, forming a so-called bamboo shoot-like shape 111. There is.

Reference numeral 112 designates a plate having a hole 113 into which the filter connecting portion 110 can be inserted, which is inserted into the filter connecting portion 110, abuts against the flange 107, and is integrally connected by welding or the like. The exhaust side joint 115 also has substantially the same structure as the suction side joint 105.

Suction side joint 1 constructed as described above
05 and the exhaust side joint 115, as shown in FIG. 2, the sampling pipe connecting portion 108 is inserted from the inside into the openings 116 and 117 provided in the side wall of the housing 1, and the plate 112 is attached to the inner surface of the side wall via packing. It is attached by screwing.

Reference numeral 120 denotes a cable inlet through which a cable such as a power line and a signal line is inserted.
As shown in (c), the mounting hole 1 of the cable inlet 120
18 is provided, and a mounting bracket 121 is screwed inside the mounting hole 118 via packing.
As shown in FIG. 24, the mounting bracket 121 has a substantially U-shaped cross section and is provided with two large and small holes 122 and 123.
The large hole 122 is formed to have substantially the same size as the mounting hole 118 provided in the housing 1. Since there are two types of cable inlets 120 having different sizes in relation to the surrounding pipes, either the hole 122 or 123 is made to face the mounting hole 118 depending on the size, and the mounting bracket 120 is mounted on the casing. Body 1
The cable inlet 120 can be attached to the housing 1 without a gap by screwing the cable. In addition, when using the cable inlet 120 having a further special diameter, it can be easily dealt with by manufacturing a mounting member having a hole aligned with this.

Reference numeral 131 is a first connection hose connecting the filter 5 and the fire detection unit 30, 132 is a second connection hose connecting the fire detection unit 30 and the suction fan 91, and 133 is a suction fan 91 and the exhaust side joint 115. Third to connect
It is a connecting hose.

FIG. 25 shows the first to third connecting hoses 131 to
The reference numeral 133 denotes a bellows-shaped hose 134 which constitutes a flexible tube made of a soft synthetic resin.
135 is made of a soft synthetic resin such as polyvinyl chloride (PVC) connected to both ends of the hose 134,
A substantially cylindrical pipe joint having elasticity, a double structure hose connecting portion 136 having a gap h between the large diameter portion 137 and a small diameter portion 138 longer than the large diameter portion 137, and a diameter substantially the same as the large diameter portion 137. Connecting part 139 and connecting part 139
140 around the outer periphery of the flange
It consists of This collar portion 140 has hoses 131 to 1
Although it is for hanging a finger when the 33 is attached or detached, it may be omitted. Then, both ends of the hose 134 are inserted into the gap h of the hose connecting portion 136, and are integrally connected by an adhesive to form the first to third connecting hoses 131 to 133.
Is configured.

Of the first to third connection hoses 131 to 133 constructed as described above, one end of the first connection hose 131 has one pipe joint 1 as shown in FIG.
35 is inserted into the opening 31a provided in the detection part case 31 and press-fitted into the connection part 63b of the intake joint 60a which is the intake side of the fire detection part 30 attached to the detection part body 33, and the other pipe joint 135 is filtered. 5 is press-fitted into the connecting portion 9 on the exhaust side. At this time, pipe joint 1
Since 35 and 135 are made of a soft synthetic resin having elasticity, they are in close contact with the connecting portion 63b of the intake joint 60a of the fire detecting portion 30 and the connecting portion 9 of the filter 5 and airtightness is maintained.

Similarly, one pipe joint 135 of the second connecting hose 132 is press-fitted into the exhaust joint 60b which is the exhaust side of the fire detection unit 30, and the other pipe joint 135 is the intake side of the suction fan 91. It is pressed into the intake port 92. Further, the third connecting hose 133
One pipe joint 135 is press-fitted into the exhaust port 93 of the suction fan 91, and the other pipe joint 135 is press-fitted into the connection portion 110 of the exhaust side joint 115.
In addition, the connecting portion 1 between the suction side joint 105 and the filter 5
7 may also be connected by the connecting hose as described above. By doing so, even if the position of the filter 5 deviates from the suction side joint 105, both can be reliably connected and airtightness can be maintained. First to third above
When connecting the connection hoses 131 to 133 to the filter 5, the suction fan 91, and the exhaust side joint 115, a ring-shaped projection or a bamboo shoot portion is provided in these connection portions or connection portions, so that a pipe of a flexible tube. The joint and the like can be more closely adhered and kept airtight, and can be prevented from coming off.

This type of fire detection device monitors fires by sucking only the air in the monitoring area (for example, a computer room), and it is necessary to maintain the inside of the housing in a highly airtight state. For this purpose, it is necessary to prevent air from entering through the filter, the fire detection part, and the suction fan connection part in the housing connected by piping. As described above, the present invention connects the pipe joint 135 made of a soft synthetic resin having elasticity to both ends of the flexible tube, and connects the pipe joint 135 to the filter 5, the fire detection unit 30, and the suction fan 91 (or Since the joints are press-fitted to connect between the joints (or joints), the adhesion between the joints (or joints) and the pipe joint 135 can be improved, and the intrusion of air can be reliably prevented. Therefore, it is possible to obtain a highly accurate and highly reliable fire detection device. Further, in this fire detection device, since the suction fan 91 constantly sucks air to generate a negative pressure, the flexible pipe joint 135 is connected to the connecting portion 63.
It adheres to b and has improved airtightness. In this way, since the adhesion of the connecting portion in the housing 1 is enhanced, high airtightness can be obtained without interposing packing or the like between the housing 1 and the cover 3.

The power supply line taken in from the cable taking-in port 120 is connected to the terminal block 100, is connected to the suction fan 91 via the terminal plate 98, and is also the first of the light source device 80 via the connector 89. The printed circuit board 81, the printed circuit board 71 of the air volume detector 70, and the printed circuit board 54 of the amplifier cap 53 are respectively connected. Further, the output signal lines of the light receiving element 54a and the air flow sensor 72 are taken out from the printed circuit boards 54, 71, the connector 89, the terminal board 98, the terminal block 100, and the cable inlet 120 to the outside.

Next, the operation of the present invention configured as described above will be described. When the power is turned on, the suction fan 91 operates to suck the air flowing back from the computer room to the ventilation room under the floor through the sampling tube. The sucked air is guided to the filter 5 through the vent hole 106 of the suction side joint 105 and the pipe 29, and fine dust and the like are removed by the filter element 22 and sent from the first connection hose 131 to the fire detection unit 30. , The optical chamber 35 through the intake joint 60a
Be led to. Then, it passes through the inside of the optical chamber 35, the exhaust joint 60b, the second connection hose 132, and the suction fan 9
Exhaust side joint 1 via 1 and 3rd connecting hose 133
It is discharged from 15 to the outside (ventilation chamber). It should be noted that the terms intake, suction, and suction used in this specification have almost the same meaning.

In the meantime, in the optical chamber 35, the light emitting element 86 of the light source device 80 is intermittently turned on, for example, in a predetermined cycle, and the light is projected into the optical chamber 35 through the light introducing hole 44 provided in the cylindrical portion 36. Be illuminated. As shown in FIG. 11, the slit 46 of the slit plate 45 installed in the optical chamber 35 becomes smaller toward the side of the amplifier cap 53 having the light receiving element 54a, and light from the light emitting element 86 enters the light receiving element 54a. The exhaust cap 57 side is enlarged. Therefore, the light receiving element 54a normally does not receive light.

Now, when a fire occurs and smoke is mixed in the air sent into the optical chamber 35, the light from the light emitting element 86 is diffusely reflected by the smoke and is scattered by the light receiving element 54a. As a result, the amount of light converged by the lens 52 is added, and the light receiving element 54a outputs an electric signal corresponding to this, so that the occurrence of a fire can be detected. Further, the air volume detector 70 detects the amount of air flowing through the exhaust joint 60b during this period, and the optical chamber 35
Detects whether air is flowing normally.

In the above description, the suction side joint 105
The exhaust side and the intake side of the exhaust side joint 115, the intake joint 60a of the fire detection unit 30 and the exhaust joint 6
The connection portion 63b of 0b is formed in the shape of a bamboo and the ring-shaped protrusions are provided on the outer periphery of the connection portions 9 and 17 of the filter 6, the intake port 92 and the exhaust port 93 of the suction fan 91. May have a bamboo shoot-like shape or a ring-like projection. Further, the structure of each of the other parts and devices is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the present invention.

[0057]

As is apparent from the above description, according to the present invention, the following effects can be obtained. (1) A suction fan, a filter, and a fire detection unit are housed in a housing, and a cylindrical connection portion is provided on the intake side and the exhaust side of these suction fan, filter, and fire detection unit, and at least the exhaust side of the filter and the fire detection unit. Since the intake side of the section, the exhaust side of the fire detection section, and the intake side of the suction fan are connected by flexible tubes with pipe joints with soft elasticity at both ends, the pipe joint is press-fitted into the connection section. It is kept in close contact and is kept airtight. Therefore, there is no possibility that air will be sucked from the joint between the connecting portion and the pipe joint, and the airtightness can be improved.

(2) Since the tip of the connecting portion is formed in the shape of a bamboo or a ring-shaped projection is provided on the outer periphery in the vicinity of the tip, the pipe joint does not easily come off from the connecting portion and is unlikely to fall off. (3) Since the flange portion is provided at approximately the center in the height direction of the pipe joint, it is easy to grasp when pulling out from the connection portion.

(4) Since the suction side joint attached to the casing and the intake side connecting portion of the filter are connected by the flexible tube having the flexible and elastic pipe joints at both ends, the casing is Even if the hole provided at the position where the suction side joint is mounted is displaced from the connection portion of the filter, the hermeticity is not impaired.

(5) Since the opening is provided in the connecting portion provided on the exhaust side of the fire detecting portion and the air volume detector is screwed to the opening through the rubber packing, the hermeticity of the opening may be impaired. In addition, since it is fixed by screwing, it can be easily attached and detached, and field work can be improved.

(6) The air flow detector has a sensor holder consisting of a substrate and a cylindrical portion, and a printed circuit board on which the air flow sensor is mounted. Since the cylindrical part is inserted into the opening provided in the connection part of the sensor holder and the printed circuit board of the sensor holder is integrally screwed to the connection part, attachment and detachment and replacement of the air flow sensor are extremely easy. Site workability can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a cover of an embodiment of the present invention is removed.

2 is a plan view showing a state in which the internal device of FIG. 1 is removed,
It is a front view and a side view.

FIG. 3 is a schematic diagram showing a detached state of the cover of FIG.

FIG. 4 is a plan view, a partial side view, and a sectional view of a filter cover of a filter.

5A and 5B are a front view and a cross-sectional view of a filter mount.

FIG. 6 is a side view of the filter.

7A and 7B are a plan view, a front view, and a side view of a holding member of a filter.

FIG. 8 is a partial cross-sectional view of a fire detection unit.

FIG. 9 is an exploded view of an optical chamber of the fire detection unit.

FIG. 10 is a plan view, a front view, and a side view of an optical case with a part omitted.

FIG. 11 is a sectional view of an optical chamber.

FIG. 12 is a side view and a front view of a slit plate.

FIG. 13 is a sectional view and a front view of a slit plate holder.

FIG. 14 is a side view of the lens holder.

FIG. 15 is a front view and a side view of an amplifier cap.

FIG. 16 is a front view of an exhaust cap.

FIG. 17 is a cross-sectional view showing a connected state of an intake joint.

FIG. 18 is a sectional view of an air volume detector.

FIG. 19 is an exploded perspective view of a light source device.

FIG. 20 is a plan view, front view, and side view of the cover.

FIG. 21 is a partial cross-sectional view of the housing showing a mounting state of the fire detection unit.

22A and 22B are a plan view and a front view of a mounting member of a suction fan.

FIG. 23 is a front view, a plan view and a sectional view of a suction side joint.

FIG. 24 is a plan view and a front view of a fitting for a cable intake port.

FIG. 25 is a partial cross-sectional view of a connection hose.

FIG. 26 is a schematic view showing an installation example of a fire detection device.

FIG. 27 is a perspective view showing an example of a conventional fire detection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 case 1a cover 3 cover mounting bracket 4 mounting bracket 5 filter 6 filter cover 9 connecting part 10 protrusions 11a, 11b locking piece 12 locking claw 13 filter mounting base 16 locking part 16a, 16b cam part 17 connecting part 18 protrusion 21 Mounting Leg 22 Filter Element 25 Filter Fitting Metal Fitting 26 Filter Holding Metal Fitting 28a, 28b Oblong Hole 30 Fire Detecting Part 32a, 32b Mounting Fitting 35 Optical Chamber 36 Cylindrical Part 37a, 37b Optical Case 38, 38a Fitting Groove 39 Protrusion 40a, 40b, 41a, 41b Locking claw 42 Convex part 43 Air introducing hole 44 Light introducing hole 45 Slit plate 47 Slit plate holder 49 Recess 50 Lens holder 53 Amplifier cap 54a Light receiving element 55a, 55b Locking hole 57 Exhaust cap 58a, 58b Stop hole 59 Exhaust hole 60a Intake port 60 b Exhaust joint 63 b Connection part 70 Air flow detector 71 Printed circuit board 72 Air flow sensor 73 Sensor holder 75 Cylindrical part 80 Light source device 81 First printed circuit board 82 a to 82 c Pin 83 Second printed circuit board 84 a to 84 c Pin hole 86 Light emitting element 87 Conductive Film 88 Cover 90a, 90b Fixing Fixture 91 Suction Fan 92 Intake Port 93 Exhaust Port 105 Suction Side Joint 108 Sampling Pipe Connection Part 110 Filter Connection Part 111 Bamboo Bar 115 Exhaust Side Joint 120 Cable Intake Port 121 Mounting Fitting 131th 1 connection hose 132 2nd connection hose 133 3rd connection hose 134 hose 135 pipe joint

Claims (6)

[Claims] 1. A filter having a sampling tube provided in a monitoring area, a suction fan for sucking air in the monitoring area from the sampling tube, a filter for removing dust of the sucked air, and a light emitting section and a light receiving section. And a suction fan, a fire detection device comprising a photoelectric fire detection unit for detecting smoke in the sucked air, wherein the suction fan, the filter, and the fire detection unit are housed in a housing. Cylindrical connection parts are provided on the intake side and the exhaust side of the suction fan, the filter and the fire detection part, and at least the exhaust side of the filter and the intake side of the fire detection part, the exhaust side of the fire detection part and the intake of the suction fan. A fire detection device, characterized in that the connecting portions on the side are connected by flexible tubes having pipe joints having softness and elasticity at both ends. 2. The fire detection device according to claim 1, wherein the tip portion of the connection portion is formed in a bamboo shoot shape, or a ring-shaped projection is provided on the outer periphery in the vicinity of the tip portion. 3. The fire detection device according to claim 1, wherein a flange is provided substantially at the center of the pipe joint in the height direction. 4. A flexible tube having a flexible and elastic pipe joint at both ends connects the suction side joint attached to the housing and the intake side connecting portion of the filter. Item 1. The fire detection device according to item 1. 5. A sampling pipe provided in a monitoring area, a suction fan for sucking air in the monitoring area from the sampling tube, a filter for removing dust of the sucked air, and a light emitting portion and a light receiving portion, A fire detection device comprising a photoelectric fire detection unit that is provided between a filter and a suction fan to detect smoke in the air that has been sucked in, and an opening is provided at a connection portion provided on the exhaust side of the fire detection unit. A fire detection device, characterized in that the air flow detector is screwed to the opening through a packing. 6. An air flow detector has a sensor holder consisting of a substrate and a cylindrical portion, and a printed circuit board on which the air flow sensor is mounted, and the air flow sensor is inserted into and protruded from the cylindrical portion of the fire detection unit. The cylindrical portion is inserted into the opening provided in the connection portion, and the board of the sensor holder and the printed board are integrally screwed around the opening provided in the connection portion. The fire detection device according to claim 5.