JPS6314263B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention automatically operates a predetermined mechanism at a predetermined temperature, or maintains a predetermined mechanism in an operating state within a predetermined temperature range, and automatically operates a predetermined mechanism at a predetermined temperature. The present invention relates to a temperature fuse used to mainly mechanically control the operation of a predetermined mechanical section depending on a predetermined temperature, such as automatically switching the fuse to an inoperative state when the temperature reaches .

An example of a conventional temperature fuse of this kind is a temperature fuse for smoke prevention or fire prevention dampers. A specific embodiment in which a smoke-proof or fire-proof damper provided in a duct is automatically and mechanically operated according to the temperature of a fluid passing through the duct will be described with reference to FIGS. 1 to 5.

In FIGS. 1 and 2, 1 is a damper for smoke prevention or fire prevention, and this damper 1 is mounted on a rotary shaft 3 which is rotatably mounted in a duct 2.

Reference numeral 4 designates an actuation box for the damper 1, and this actuation box 4 is attached to the outside of the duct 2 by fixing it with screws 7 through a dowel 5 for preventing condensation.

One end (not shown) of the rotating shaft 3 is supported by a bearing (not shown) attached to the side wall of the duct 2, and the other end 3a is attached to the side wall of the duct 2 as shown in FIGS. The actuating box 4 is supported by a bearing 8 (see FIG. 4), and extends through the actuating box 4 to protrude outside of the actuating box 4. The protruding end 3a of this rotating shaft 3
A fan-shaped plate 9 for adjusting the opening of the damper 1 is fixed thereto, and an operating lever 10 of the damper 1 is fixed thereto.

In addition, a coil spring 11 is elastically loaded at the end of the rotating shaft 3 on the operation box 4 side, so that the damper 1
is biased in the closing direction.

In the figure, the damper is held in an open state against the elasticity of the coil spring 11 via an automatic closing mechanism of the damper 1 disposed in the actuating box 4, and the damper is kept open at the temperature shown in FIGS. 4 and 5. When an abnormality occurs in the temperature of the fluid passing through the duct 2 via the fuse 12, the automatic closing mechanism is automatically activated, and the damper 1 can be closed by the elasticity of the coil spring 1. There is.

As shown in the fourth and fifth figures, the temperature fuse 12 has a temperature sensing end 13 protruding into the duct 2, and a case body 20 fixed to a holding case 15 installed in the operation box 4 with a nut 16. be. An actuating shaft 17 of the temperature fuse 12 is housed inside the case body 20, and the actuating shaft 17 can always move its working end 17a to a non-working position by a spring 18 elastically installed in the case body 20. At the same time, the working end 17a is pushed into the nut 16 against the elasticity of the spring 18.
The lower end 17b is connected to the temperature sensing end 13 while protruding to the side.
The working end 17a is held in the working position by being fixed to the working end 17a with a molten metal 19 such as a molten alloy.

Reference numeral 21 denotes a shaft tube that is fitted and fixed to the outside of the operating shaft 17, and the spring 18 is elastically loaded between the upper end 21a of this shaft tube 21 and the nut 16, and the lower end 21b is fixed to the outer side of the operating shaft 1.
7 is configured to be engaged with a stopper 22 attached to the temperature sensing end 13 to prevent the operating shaft 17 from coming off.

Working end 1 of the working shaft 17 of this temperature fuse 12
7a is the molten metal 1 resisting the elasticity of the spring 18.
9, the nut 16 is held in the operating position in a protruding state above the nut 16, and the operating end 17a is located in the operating box 4 as the operating rod 30 in the automatic closing mechanism of the damper 1 of the device, as shown in FIGS. 3 and 5. It is held in the locked position.

The operating rod 30 is rotatably supported around a support shaft 31, and is supported by a spring 3 provided on the support shaft 31.
2, it is constantly biased in the direction of the working end 17a.

The support shaft 31 is provided at one end of an upper support plate 63a fixed to the operation box 4.
A locking arm 35 is rotatably attached to the support shaft 36 via a support shaft 36 provided opposite the support shaft 31, and a locking rod 40 is rotatably attached via a fulcrum 41.

The locking arm 35 is rotatably supported by a support shaft 36 at a substantially central portion thereof, and is constantly biased in the direction of the locking rod 40 via a spring 37 provided on the support shaft 36. One end (active end) of this locking arm 35
35a is located within the rotation range of the operating rod 30, and the other end 35b is provided to protrude outside of the operating box 4. Furthermore, the working end 35
A locking groove 39 that engages with the locking rod 40 is provided between the support shaft 36 and the support shaft 36, and a long hole that engages with an operating piece 52 of a solenoid actuator 51, which will be described later, is provided between the support shaft 36 and the other end 35b. 35c is provided.

The locking rod 40 is constantly biased in the direction of an arrow 43 by a spring 42 provided at a fulcrum 41, and the engaging end 40 of the locking arm 35 engages with the locking groove 39.
a is formed so that it can be engaged with the locking arm 35 against the biasing force of the spring 42. Further, a locking end 40b that can be engaged with a locking piece 45 fixed to the rotating shaft 3 is provided at the opposite end of the engaging end 40a, and this locking piece 45 and the locking end 40
Damper 1 provided on the rotating shaft by engagement with b
is configured to be held in an open state within the duct against the rotational force of the coil spring 11.

In the figure, reference numeral 70 denotes a torque adjustment lever configured to vary the elasticity of the coil spring 11 with respect to the rotating shaft 3 and adjust the torque of the damper 1. One end 11a of the lever 70 is moored to the rotating shaft 3. The other end 11b of the coil spring 11 is moored, and the operating end 70a of the lever 70 is made to protrude outside the actuating box 4, so that the rotating shaft 3 can be connected from the outside.
The elasticity of the coil spring 11 is adjusted via the elongated hole 71 of the lever 70 by rotating in the direction of arrows 72 and 73 shown in the third figure with the lever 70 as a fulcrum.

Reference numeral 80 denotes glass wool as a heat insulating material filled in the bottom of the operation box 4.

Next, the operation of the fire damper having the above structure will be explained below.

First, when the temperature sensing end 13 of the temperature fuse 12 senses an abnormality in the temperature of the fluid passing through the duct 1, that is, the temperature sensing end 13 is connected to the molten metal 19.
When the temperature of the fluid reaches a point where it melts the molten metal 19, the elasticity of the spring 18 works to slide the operating shaft 17 downward in the direction of arrow 24 in FIG.

Then, when the working end 17a of the operating shaft 17 sinks into the case body 20 and the locking state between the working end 17a and the operating rod 30 is released, the working end 17a
The actuating rod 30, which was locked in the lock, rotates about the support shaft 31 in the direction of arrow 33 shown in FIG. The locking arm 35 is engaged with the working end 35a of the arm 35, and is rotated about the support shaft 36 in the direction of the arrow 38 shown in the third figure against the elasticity of the spring 37.

As the operating rod 30 rotates, the locking arm 3
The engaging end 40a of the locking rod 40 that is engaged and locked in the locking groove 39 of No. 5 is disengaged from the locking groove 39, and the locking rod 40 is moved in the direction of the arrow 43 shown in the third figure by the elasticity of the spring 42 with the support shaft 41 as a fulcrum. Rotate. And the rotation axis 3
The locking end 40b of the locking rod 40 that was locking the locking piece 45 that prevents the rotation of the rotary shaft 3 against the elasticity of the coil spring 11 that urges the damper 1 to rotate in the closing direction of the damper 1 is moved to the locking piece 45. more out of place,
The locking of the rotating shaft 3 is released, the rotating shaft 3 is rotated by the elasticity of the coil spring 11, and the flow path of the duct 2 is closed by the damper 1.

Note that the rear end 35b of the locking arm 35 of the automatic closing mechanism of the damper 1 having the above-mentioned structure is connected to the actuation box 4.
The rear end 35b of the locking arm 35 is projected to the outside of the locking arm 35.
configured so that it can be rotated manually,
The automatic closing mechanism is configured so that the closing operation can be performed without operating the thermal fuse 12.

Therefore, there is an advantage that the damper 1 can be closed not only by checking the same mechanism but also by manual operation as needed without relying on automatic closing via the temperature fuse 12.

Further, the locking arm 35 is connected to an operating piece 52 of a solenoid actuator 51 through a pin 50 in its elongated hole 35c, and the solenoid actuator 51 is actuated to move the operating piece 52 in the direction of the arrow 53 shown in the third figure. By pulling, the locking arm 35 can be rotated in the direction of the arrow 38 about the support shaft 36,
The above-mentioned manual unlocking operation can be operated electrically and remotely, thereby solving the difficulty of the above-mentioned manual unlocking operation, that is, the duct 2 is often hidden from the outside by the ceiling etc. If the solenoid actuator 51 is installed in a location where manual operation is difficult, the solenoid actuator 51 can be used to easily operate the solenoid actuator 51.

Furthermore, 60a and 60b (see Fig. 4) are limit switches that detect the rotational displacement of the damper 1.
They are fixed to upper and lower support plates 63a and 63b, respectively.
Movable contact lever 61 of both switches 60a, 60b
A switch actuating body 64 that comes into contact with a and 61b is arranged to be interlocked with the rotating shaft 3. The switch is configured to be able to remotely detect the operation of the automatic closing mechanism of the damper 1, or to be used to supply a starting signal for a required exhaust blower or ventilation blower. There is.

Now, as is clear from the above explanation, the temperature fuse 12 biases the working end 17a of the operating shaft 17 so that it can be displaced to the non-working position by the spring 18,
Conversely, the lower end 17b of the operating shaft 17 is fixed to the temperature sensing end 13 with molten metal 19 against the elasticity of the spring 18, and the damper 1 is closed by melting the molten metal 19 at the temperature sensing end 13. Although an embodiment has been shown in which the mechanism is configured to operate, this temperature fuse 12 is conversely connected to the operating shaft 17.
The working end 17a of the temperature sensing end 13 is biased by the spring 18 so that it can be displaced to the working position (the position where the working end 17a and the operating rod 30 are released from the locked state), and the molten metal 19 of the temperature sensing end 13 is applied to the lower end. An embodiment in which the spring 17b is fixed in a non-active position against the elasticity of the spring 18 may also be mentioned.

However, since the temperature fuse with such a configuration has a structure in which the molten metal 19 of the temperature sensing end 13 is fixed, there is a variation in the melting of the molten metal 19 depending on the temperature, and the temperature fuse 12 itself at a required temperature varies. The uniformity of the operation cannot be properly maintained, and there are undeniable variations in the product itself between each temperature fuse, and this drawback is partly due to the difficulty in adjusting the molten metal 19. This is even more true in the case of alloys.

In addition, the molten metal 19 deteriorates over time, especially when the device is used for a long time, resulting in deterioration of the molten metal 19, resulting in poor durability.

Furthermore, since the lower end 17b of the operating shaft 17 is fixed with the molten metal 19, product checking must be done by sampling inspection, which has the drawback that not all products can be inspected, and once checked, Regeneration must be supplemented by a separate temperature fuse, and when the operation of the damper closing mechanism described above is periodically inspected, the temperature fuse must be inspected with the assumption that it is operating properly. However, there are drawbacks such as the need for measures such as the provision of other means for inspecting the operation, and the necessity of replacing the thermal fuse depending on its durability period.

Therefore, the inventor conducted research to eliminate the various drawbacks of the temperature fuse constructed as described above, and as a result, developed the temperature fuse of the present invention.

That is, by locking the operating shaft, which is biased in the acting or non-acting direction by a spring in the case, through the bimetal in the non-acting or working position, the engagement of the operating shaft is caused by the deformation of the bimetal due to temperature. It is configured so that the lock can be released and the operating shaft can be moved to the active or non-active position by the elasticity of the spring, improving the uniformity of product operation and making it possible to inspect all products and incorporating it at the required location. , post-equipment inspections can be carried out whenever necessary, and in addition to improved durability, it also has the advantage of being able to be easily repaired by simply converting the bimetal, as mentioned above. This has succeeded in solving the various drawbacks of conventional temperature fuses.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 90 denotes a cylindrical case, and the upper end of this case 90 is provided with a threaded portion 91, and the lower portion thereof is provided with openings 92 and 93 for temperature sensing on both left and right sides.

Reference numeral 94 denotes an operating shaft that is vertically movably inserted through the case 90. The lower end 94b of this operating shaft 94 is flat with a rectangular cross section, and a stopper ring 95 is fixed to the upper end.

96 is a bimetal, and this bimetal 96 is formed into a flat plate shape and has a curved lower end. A locking hole 97 for the actuating shaft 94 is bored at the lower end, and a bimetallic retaining ring 10 whose upper end is fitted and fixed to the approximate center of the case 90
7 with screws 98, and the opening 9 of the case 90.
The entire surface is exposed through 2.

Reference numeral 99 denotes a locking pin screwed into a threaded groove provided at the lower end of the operating shaft 94, so that the length of the protruding end of the pin 99 can be adjusted while screwing the locking pin 99 forward and backward. It is structured as follows.

Thus, while the spring 100 is fitted onto the upper end of the operating shaft 94, its lower end 100a is locked to the stopper ring 95, and the upper end 100b is
The spring 100 is loaded between the nut 101 on the inside of the case 90 and the stopper ring 95, and the spring 100 is activated. The shaft 94 is always biased toward the lower side of the case 90.

In addition, after pulling the operating shaft 94 upward in the case 90 against the elasticity of the spring 100, the locking pin 99 attached to the lower end of the operating shaft 94 is engaged with the locking hole 97 of the bimetal 96. , the actuating shaft 94 is connected to the spring 1 via the bimetal 96.
The upper end 94a of the actuating shaft 94 is supported in a protruding state above the nut 101 against the elastic force of the nut 101.

Incidentally, reference numeral 102 denotes a screw screwed into a threaded portion provided at the lower end of the operating shaft 94, and the screw 102 is configured to force and adjust the deformation of the bimetal 96. That is, the bimetal 96 is set while being forcibly deformed in advance using the screw 102 so that the bimetal 96 does not deform within a predetermined temperature range, for example, within the range of 0 to 40°C.

In addition, by providing a wear-resistant coating layer (not shown) on the outer peripheral edge of the locking hole 97 of the bimetal 96, the locking hole can be opened by sliding with the locking pin 99 when the bimetal 96 is deformed. It is configured to prevent wear on the peripheral edge of 97, and furthermore, 10
Reference numeral 3 denotes a heat insulating plate interposed between the fixed ends of the bimetal 96, which ensures proper operation of the bimetal 96 by blocking heat conduction from the case 90 or the operating shaft 94. 106 is a cap fitted into the opening at the lower end of the case 90.

Now, as an explanation of a specific embodiment of the temperature fuse of the present invention having the above-mentioned configuration, as an explanation of an embodiment of a conventional temperature fuse, the duct shown in the drawings will be described. An example can be given in which the temperature fuse of the present invention is installed in place of the temperature fuse 12 in the automatic closing mechanism section of the damper 1 of No. 2.

Specifically, as shown in FIG. 10, the case 90 is attached to the holding case 15 of the actuation box 4 by screwing together the screw 105 screwed on the outer periphery of the nut 101, and the openings 92, 93 of the case 90 are screwed together.
is set in the duct 2, and the upper end 94a of the operating shaft 94 becomes the operating end, and the operating rod 3
0 is locked in a non-operating position.

For other configurations, the temperature fuse 12
Since this is the same as in the case of , detailed illustration and explanation thereof will be omitted.

According to the temperature fuse of this embodiment having the above configuration, the upper end 94a of the operating shaft 94 is curved and deformed by the bimetal 96 due to the temperature of the fluid passing through the duct 2, and is engaged from the locking hole 97. When the stop pin 99 is removed, the spring 100 works to lower the operating shaft 94, and the upper end 94, which is the operating end, moves downward.
As a result of displacing a to the inactive position, the operating rod 30
The damper 1 can be automatically closed through the operation of each mechanical section similar to that described above.

Furthermore, in the above, the upper end 94a of the actuating shaft 94 is held at the operating position through the bimetal 96 against the elasticity of the spring 100, and is released by the deformation of the bimetal 96, so that the upper end 94a of the operating shaft 94 becomes the operating end. Although the embodiment has been described in which the upper end 94a is moved to the non-acting position, on the contrary, by making the lower end 94b of the operating shaft 94 the active end, the spring 1
00 is a structure in which the lower end 94b of the operating end 94 is always biased to be displaced to the operating position, and the lower end 94b of the operating shaft 94 is held in the non-operative position by the bimetal 96, and the lower end 94b of the operating shaft 94 is displaced to the operating position by its deformation. This is something that can be done.

That is, depending on whether the upper or lower end of the operating shaft 94 in the above embodiment is used as the active end, it is possible to select and use either of the modes of operation or inaction as necessary. Of course, all embodiments within the technical scope of the present invention can be implemented while selecting various other embodiments.

As is clear from the above explanation, the temperature fuse of the present invention is such that the operating shaft, which is biased by the bimetal in the acting or non-working direction, can be locked in the non-working or working position via the flat bimetal. With this structure, the strength of the spring in the direction of the biasing force can be improved, and deformation of the bimetal due to the biasing force can be prevented, so that malfunction of the operating shaft due to deformation can be prevented. In addition, unlike conventional temperature fuses that are fixed using molten metal, it is possible to eliminate variations between metallurgical techniques and greatly improve the uniformity of precision between a large number of products. In addition to the fact that bimetal temperature setting is easier and more accurate than normal temperature setting, it is also possible to conduct product performance tests on all products, which not only improves product accuracy but also greatly improves reliability. It offers significant advantages.

Moreover, in addition to being able to carry out repairs by simply replacing the bimetal, compared to fixing with molten metal, it is also possible to carry out operational tests as necessary after setting up the required mechanical parts, thereby preventing malfunctions. It has great effects, such as being useful for this purpose, ensuring accurate operation at all times when needed, and being able to solve problems caused by changes over time all at once.

[Brief explanation of the drawing]

Figures 1 to 5 show an example in which a conventional temperature fuse is implemented in the closing mechanism of a damper in a duct, with Figure 1 being a front view of the actuation box, Figure 2 being a side view of the same, and Figure 3 being a front view of the actuating box. 4 is an enlarged plan view of the operating box with the lid removed, FIG. 4 is a sectional view of the same side, and FIG. 5 is a partial sectional side view showing how the temperature fuse is installed.
6 to 10 show an embodiment of the temperature fuse in the closing device for fire prevention and smoke prevention dampers of the present invention, in which FIG. 6 is a front view, FIG. 7 is a longitudinal sectional view, and FIG.
Figure a is a plan view of the same, Figure 8b is a bottom view of the same, Figure 9 is a plan view of only the retaining ring, and Figure 10 is a closing mechanism of the damper shown in Figures 1 to 6 in place of the conventional temperature fuse described above. It is a partial side sectional view showing the installation state in the case of implementation.

Claims (1)

[Scope of Claims] 1. An operation box provided outside the duct to control opening and closing of a damper in the duct, a coil spring wound around the rotation shaft of the damper to bias the damper in the closing direction, and rotation of the damper. A locking piece fixed to a shaft, and a lock pivotably pivoted in a direction in which the locking end is locked to the locking piece to hold the damper in an open state and the locking end is released from the locked state with respect to the locking piece. A locking groove is engaged with the engaging end of the locking rod to maintain the locked state of the locking end of the locking rod and the locking piece, and the engaging state of the locking groove with the engaging end of the locking rod is maintained. a locking arm pivotably pivoted in a direction to release the lock; an operating rod pivotably pivotable in a direction to release the engagement between the locking groove of the locking arm and the engaging end of the locking rod; and the operating rod. An operating shaft that locks the operating end of the operating rod to prevent the operating rod from pivoting is slidably inserted in the axial direction of the case body, and the operating shaft is constantly biased in the non-acting direction by a spring, and the operating shaft is A locking pin is provided protruding from the end of the shaft, and a locking groove is provided at the other end of a flat bimetal whose one end is fixedly attached to the case body side. A bimetallic temperature fuse configured by engaging a locking pin on the shaft to lock the operating shaft in a locking position with the operating rod against the elasticity of the spring. damper closure device. 2. The locking pin of the operating shaft of the bimetallic temperature fuse is configured such that the locking pin can be moved in either the front or rear direction by screwing the locking pin into the threaded groove screwed into the operating shaft. 2. The fire prevention and smoke prevention damper closing device according to claim 1, wherein the locking pin is configured so that the protruding length of the locking pin can be adjusted while the locking pin is screwed forward. 3. The fire prevention and smoke prevention damper closing device according to claim 1, wherein the flat bimetal is constructed by providing a wear-resistant coating layer in the locking groove. 4. The fire prevention and smoke prevention device according to claim 1, wherein the flat bimetal is configured such that deformation can be forced and adjusted by a screw provided at one end of the operating shaft. Damper closure device. 5. The closing device for a damper for fire prevention and smoke prevention according to claim 1, wherein the flat bimetal is fixed to the case body with a heat insulating plate interposed therebetween.