JPH0450042Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a fire damper that is installed in an air conditioning or exhaust duct of a building or other structure, detects a temperature rise when a flame occurs, and closes the duct. In particular, this invention relates to fire dampers used in strongly corrosive atmospheres.

[Conventional technology]

Generally, as part of a device that forms a fireproof zone in buildings such as buildings to prevent the spread of housework fires,
Fire dampers are installed in the air conditioning and exhaust ducts. The fire damper consists of a shaft with blades that opens and closes the duct, a driving device thereof, a temperature fuse device that detects the temperature inside the duct and starts the driving device by a mechanical mechanism, and other accessory devices. 12 and 13 show an example of a conventional temperature fuse device and a conventional temperature fuse.

In the figure, reference numeral 21 denotes a conventional temperature fuse, in which two flange fittings 21a each having a shaft hole are fitted into both ends of a central metal rod 21b.
1a and the central metal rod 21b are fixed on one side with high melting point solder and on the other side with low melting point solder 21c. The temperature fuse 21 is held at one end of the casing pipe 23 of the temperature fuse device C in which a window hole is provided, and the flange fitting 21a is pressed by the rod 22 by the reaction force of the coil spring 24 and set.

[The problem that the invention is trying to solve]

However, in the electronic industry, which includes semiconductors and computers, and the chemical industry, which includes genetic engineering, highly corrosive gases are generated during the manufacturing process, and conventional fire dampers such as those mentioned above are installed in the ducts that process these gases. The following problems arose when using the .

(a) Temperature fuses that take advantage of the properties of metals with low melting points, such as solder, were used, but they corroded and repeatedly malfunctioned.

(b) The temperature fuse rod and the sliding part of the bearing are corroded, resulting in malfunction.

(c) The movable parts of the damper body become malfunctioning due to corrosion.

(d) Internal corrosive gas leaks from around the shaft of the damper body and the rod of the temperature fuse device, corroding related parts and other equipment.

(e) Highly crystalline products are condensed on the sliding part,
Sliding parts may be damaged, causing corrosion or malfunction.

[Means for Solving the Problems] In order to solve the above problems, the present invention has a structure in which the bearing part, shaft and vanes of the damper body are made of stainless steel, and a seal ring is provided between the bearing part and the shaft. At the same time, a self-destructive temperature fuse is used as a temperature fuse, which is made by sealing liquid and gas in a spherical glass container with a protrusion, and a narrow diameter part is formed at the tip of the rod. , this rod is coaxially housed in a casing pipe fixed through the damper casing, and this casing pipe accommodates a temperature fuse in the tip disposed inside the damper body, and has a temperature fuse on the peripheral wall surface of the tip. A window hole is formed for inserting the temperature fuse therein, and a fuse holding hole is formed on the tip surface of the tip portion into which the protrusion of the temperature fuse can be inserted and through which the narrow diameter portion of the rod can be inserted. The coil spring is housed coaxially within the casing pipe, and is characterized in that a seal ring is provided on the distal end side of the coil spring to seal between the rod and the casing pipe.

〔Example〕

An embodiment of the present invention will be described below based on the drawings of FIGS. 1 to 11. What is shown in FIGS. 1 and 2 is a fire prevention damper according to an embodiment of the present invention, in which two shafts 2, 2 are passed through a damper casing 16 having the same cross section as the duct to be installed, and each shaft 2 has a blade 3. The bearing side 1 is attached to the damper casing 16 and is supported by the bearing side 1 provided on the outside of the damper casing 16. A drive device 4 is fixed to one end of one of the shafts 2 outside the damper casing 16,
Further, the two shafts 2, 2 are connected to the connecting rod 1 on the outside of the damper casing 16 on the side opposite to the drive device 4.
7 and 17 by a connecting rod 18, and are interlocked. The fire damper is inserted between air conditioning, exhaust, etc. ducts, and is connected by a flange 19. FIG. 3 shows the bearing part 1 on the connecting rod 17 side of the shaft 2. The bearing part 1 includes a housing 1a housed in a ring-shaped housing base 1d which is welded and fixed to the damper casing 16.
It consists of a bearing plate 1b fixed to a housing base 1d with bolts 1f, and seal rings 2a and 2b made of fluoro rubber are arranged between the housing 1a and the shaft 2, and between the housing 1a and the housing base 1d. A boss 1c is fixed to the outer end of the shaft 2 by a set screw 1e,
A connecting rod 17 is welded to the outer surface of the boss 1c. On the opposite side of the shaft 2 from the attachment end of one of the connecting rods 17, the shaft 2 is extended outside the bearing portion 1, and a drive device 4 is attached.

FIG. 4 shows the structure of the drive device 4 when it is set, and FIGS. 5 to 9 show changes from the time when it is set to when it is in operation. In the figure, reference numeral 8 denotes a starting member which is rotatably fixed by a rotating shaft 8a, and when set, the projecting end 7a of the rod 7 of the temperature fuse device B is pressed against the protrusion 8b by the reaction force of the spring 8d and is locked. ing. The link portion 9 includes a rod-shaped first arm 9a, a second arm 9b, and an L-shaped third arm 9c, which are rotatably pivoted in the above order by a first pin 9d and a second pin 9e. It is rotatably fixed to the drive device base 20 by a first shaft 9f at the end and a second shaft 9g at the third arm bending portion. When the starting member 8 rotates as shown in FIGS. 8 and 9, the end 8 of the first pin 9d
It intersects with c. 3rd arm 9c
A locking roll 10 is provided at the end of the third arm 9c, and when set, as shown in FIG.
Rotates counterclockwise to release the lock. circular cam 1
An arc-shaped cam hole 12a is formed on the inner surface of the cam 2 over approximately three quarters of the circumference, and a cylindrical cam stopper pin 14 vertically installed on the drive device base 20 is inserted into the cam hole 12a, so that the circular cam 12 slides during rotation. and cam stop pin 1
4 hits one end 12b of the cam hole 12a, rotation is stopped. Drive plate 1 on shaft 2
3a is attached, one end of which and the drive unit base 2
A spiral spring 13 is stretched between the members fixedly attached to the shaft 2, and urges the shaft 2 to rotate counterclockwise in FIG. 4 when set. As shown in FIG. 10, the temperature fuse device B is constructed by being housed in casing pipes 15, 15a,
As shown in FIG. 6, the lower casing pipe 15 side is inserted into the duct, the upper casing pipe 15 is fixed to the drive device base 20, and the fuse device holder 15e is fixedly attached to the damper casing 16. Lower casing pipe 15
A fuse holding hole 15b is formed in the center of the end face of the fuse holding part 15c at the tip of the fuse holding part 15c, and a total of four window holes 15d are formed in the peripheral wall surface of the fuse holding part 15c for inserting the temperature fuse 5 therein. It is formed.

As shown in FIG. 11, the temperature fuse 5 has a thermally stable liquid 5b and gas 5c sealed inside a glass container 5a, and when the temperature of the outside air rises to a predetermined temperature, the expansion pressure of the liquid 5b and gas 5c increases. The glass container 5a is crushed by this. Due to the above-described structure, the temperature fuse 5 has the features of having high acid resistance, corrosion resistance, temperature sensing accuracy, operational stability, minimal deterioration over time, and being small and lightweight. The temperature fuse 5 has its protrusion 5d inserted into the fuse holding hole 15.
It is inserted and held in the fuse holding hole 15b of c, and is exposed to the outside air through the window hole 15d.

The temperature fuse 5 is held down by one end of a rod 7 which is slidably supported by a rod bearing 7d. The fuse holding end 7b (small diameter part) of the rod 7 has a small diameter across the tapered part 7c, and is smaller than the inner diameter of the fuse holding hole 15b.
It is larger than the inner diameter of 5b. The coil spring 6 is held in a compressed state by the upper casing pipe 15a and the spring receivers 6a and 6b provided on the rod 7, and the rod 7 is brought into pressure contact with the temperature fuse 5, and when the temperature fuse 5 is crushed, the rod 7 is tapered. The part 7c is the fuse holding hole 15
b, and then pull the protruding end 7a of the rod 7 protruding outside the upper casing pipe 15a into the upper casing pipe 15a. Rod 7
A fuse device seal ring 7e made of fluorine rubber is disposed between the rod bearing 7d and the fuse device holder 15e, and a second fuse device seal ring 7f made of fluorine rubber is disposed between the fuse device holder 15e and the rod bearing 7d. Maintains airtightness.

In the fire prevention damper described above, the shaft 2, the blade 3, the housing base 1d and the housing 1a in the bearing part 1 of the damper body A, and the lower casing pipe 15 and the rod 7 of the temperature fuse device B.
The rod bearing 7d is made of stainless steel and coated with fluorine resin before assembly.
The damper casing 16 is also made of stainless steel and has an inner surface coated with fluorine resin.

Next, the operation of the fire damper configured as described above will be explained. A handle (not shown) is fixed to the outer end of the shaft 2 outside the drive device 4, and the handle rotates the shaft 2 so as to bring the blades 3 into the open position. The locking roll 10 at the end of the third arm 9c of the link portion 9 is fitted into the locking groove 11. Also, the starting member 8
is rotated to the left in FIG. 4 against the spring 8d, and the protruding end 7 of the rod 7 of the temperature fuse device B
a to protrude, return the activation member 8 to the right, and remove the convex portion 8.
Lock b. Furthermore, as shown in FIG. 5, the temperature fuse 5 is inserted into the fuse holder 15c through one of the window holes 15d, and is held down by the fuse holding end 7b of the rod, thereby completing the setting of the fire damper. When a flame occurs, when the temperature inside the duct exceeds a predetermined temperature, the temperature fuse 5 is damaged by the expansion pressure of the internal liquid 5b and gas 5c, and the rod 7 is pushed into the duct by the reaction force of the coil spring 6, as shown in FIG. direction, the protruding end 7a and the activation member 8
The lock is released. The activation member 8 rotates clockwise as shown in FIG.
is pushed up, the third arm 9c is rotated counterclockwise, the locking roll 10 and the locking groove 11 are disengaged, and the locking of the circular cam 12 is released. The shaft 2 is rotated counterclockwise by the reaction force of the spiral spring 13, and is braked by the cam stop pin 14 hitting the cam hole end 12b, and the blade 3 is brought to the closed position.

Note that the power source of the drive device, the mechanism of the link part, the shape and number of blades and shafts, the method of locking the temperature fuse device and the starting member, etc. are not limited to those of the above embodiments.

[Effect of idea]

This invention is a fire damper that detects the temperature inside the duct and closes the duct.The bearing, shaft and vanes are made of stainless steel, the bearing is provided outside the duct, and a seal ring is installed between the bearing and the shaft. At the same time, a self-destructive temperature fuse made of a glass container filled with liquid and gas is used as the temperature fuse in the temperature fuse device,
A seal ring is placed between the rod and the rod bearing, so even when installed in a duct that processes highly corrosive gases, there is little chance of malfunction due to corrosion of the temperature fuse, and the movable parts of the damper body and temperature fuse device will not operate due to corrosion. It does not cause any defects. Moreover, since it is airtightly sealed, the corrosive gas inside will not leak outside and corrode related parts and other equipment.

In addition, a window hole is formed on the peripheral wall surface of the tip of the casing pipe, and the temperature fuse can be inserted through this window hole, and the protruding part of the temperature fuse is inserted into the fuse holding hole at the tip of the casing pipe to position it. This makes replacing the fuse extremely easy. At the same time, the spherical part of the temperature fuse directly contacts the airflow in the duct through the window hole, and the protruding part is exposed to the airflow through the fuse holding hole, and the tip of the rod that touches the fuse has a narrow diameter part. Because the amount of heat escaping from the fuse to the rod is reduced through this narrow diameter section, the fuse responds sharply to changes in airflow temperature and reacts quickly even when the temperature of the airflow increases rapidly. , there is no risk of delay in closing the fire damper.

Furthermore, since a seal ring seals between the rod and the casing pipe on the tip side of the coil spring, corrosive gas will not enter into the coil spring side even though a window hole is formed. In addition to preventing corrosion of the coil spring, which is an important element in operation, it also prevents hard crystal products from adhering to the rear end of the rod and worsening the sliding properties of the rod, increasing operational reliability. Is possible.

Furthermore, when the temperature fuse ruptures, the protrusion is pushed out of the casing pipe by the small diameter part of the rod, and other pieces of the fuse also fall outside through the window hole, making it easy to remove the pieces. There is no risk that residual debris will cause trouble in setting the fuse or hinder the rod operation.

[Brief explanation of drawings]

1 and 2 are a front view and a side view showing the whole fire prevention damper according to an embodiment of the present invention, FIG. 3 is a sectional view of the bearing part, FIG. 4 is a front view of the drive device, and FIG. 7 and 8 are partial front views showing changes during operation of the drive device, and FIGS. 6 and 9 are partial side views showing the operation of the temperature fuse and starting member.
Figure 0 is a front view with half of the temperature fuse device cut away, Figure 11 is a sectional view of the temperature fuse, and Figures 12 and 13 are front views of a conventional temperature fuse device and a half cutaway of the conventional temperature fuse. be. A...Damper body, B...Temperature fuse device,
1...Bearing part, 1a...Housing (metal member),
1d...Housing base (metal member), 2...
Shaft, 2a, 2b... Seal ring, 3...
Blade, 4... Drive device, 5... Temperature fuse, 5
a...Glass container, 5b...Liquid, 5c...Gas, 5d...Protrusion, 6...Coil spring,
7... Rod, 7b... Fuse holding end (small diameter part), 7d... Rod bearing, 7e... Seal ring of fuse device, 8... Starting member, 15... Casing pipe, 15b... Fuse holding hole ,1
5d... Window hole, 16... Damper casing.

Claims (1)

[Claims for Utility Model Registration] 1. A damper main body, in which a shaft 2 rotatably supported by a bearing 1 attached to a damper casing 16 is provided with blades 3, and the blades 3 are rotated by a drive device 4 so as to be openable and closable. A, and a rod 7 in which a temperature fuse 5 for detecting the temperature inside the duct is biased by a coil spring 6.
The starting member 8 of the drive device 4 is locked and set at the rear end of the rod 7, and the drive device 4 is stopped when the temperature is below a predetermined temperature, and the temperature fuse is closed when the temperature is above a predetermined temperature. 5 is crushed, the rod 7 moves, and the temperature fuse device B is released from the starting member 8 to start the drive device 4. is made of stainless steel, seal rings 2a and 2b are arranged between the bearing part 1 and the shaft 2, and the temperature fuse 5 is a spherical glass container 5a having a protrusion 5d. 5b and a gas 5c are used, and the rod 7 has a narrow diameter portion 7b formed at its tip, and this rod 7 is fixed by penetrating through the damper casing 16. The casing pipe 15 is housed coaxially within a damper body A.
The temperature fuse 5 is accommodated in the tip disposed inside, and a window hole 15d is formed on the peripheral wall surface of the tip for inserting the temperature fuse 5 therein. A fuse holding hole 1 into which the protrusion 5d of the temperature fuse 5 can be inserted and into which the rod narrow diameter portion 7b can be inserted.
5b is formed, and the coil spring 6 is housed coaxially within the casing pipe 15, and a seal ring 7e sealing between the rod 7 and the casing pipe 15 is provided on the distal end side of the spring 6.
A fire damper characterized by being provided with. 2 Metal members 1a, 1d of bearing part 1, shaft 2
and a fire prevention damper according to claim 1, wherein the entire surface of the blade 3 and the inner surface of the damper casing 16 are coated with fluororesin.