JPH0255691B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rooftop ventilation fan, and more particularly to an improvement of a rooftop ventilation fan equipped with a drive mechanism for raising and lowering a covering member that covers a ventilator opening.

[Conventional technology]

Conventionally, such a rooftop ventilation fan is shown in FIG. 8, for example.

That is, a motor 2 is disposed within the ventilator opening 1, and a fan 3 is attached to the motor 2 and driven to rotate. These motor 2 and fan 3 are held and fixed by a support frame 5 to the ventilator body base 4 that forms the ventilator opening 1, and the hood 6 is secured to the flange 8 of the ventilator body base 4 by a fixing member 7. The installation is fixed. A damper 9 serving as a covering member covering the ventilator opening 1 is moved up and down by a drive mechanism 10. The drive mechanism 10 includes a cylindrical lifting member 11 and a motor 45 installed inside the cylindrical guide member 11. A threaded groove 12 is carved on the outer peripheral surface of the cylindrical lifting member 11, and a hole is formed in the center of the damper 9, and a threaded groove 13 is similarly formed on the periphery of the hole. The damper 9 is screwed onto a cylindrical elevating member 11.

When opening the damper 9, the cylindrical elevating member 11 is rotated by driving the motor installed in the cylindrical elevating member 11, and the damper 9 is raised along the thread groove 12 of the cylindrical elevating member 11. The fully open position detection switch 14 detects the fully open position and stops driving the motor. On the other hand, when closing the damper 9, the motor is reversely rotated to reverse the cylindrical lifting member 11 and lower the damper 9 along the thread groove 12.
The fully closed position detection switch 15 is configured to detect the fully closed position and stop driving the motor (see, for example, Japanese Utility Model Application Publication No. 185527/1983).

[Problems with conventional technology]

However, such conventional rooftop ventilation fans 1
6, the thread groove 1 of the cylindrical elevating member 11 is damaged due to wind pressure during ventilation or external wind pressure.
2 and the thread groove 13 of the damper 9 could not be maintained, and the damper 9 would engage diagonally with the cylindrical elevating member 11, causing the damper 9 to not move up and down smoothly. In addition, it is necessary to install rooftop ventilation fans with different exhaust capacities depending on the scale of the factory or warehouse.
It is necessary to change the size of the gap between the hood 6 and the hood 6. Therefore, the distance between the ventilator main body base 4 and the hood 6 varies depending on the level of exhaust capacity, and it is necessary to prepare multiple types of cylindrical lifting members 11 with different lengths, which requires manufacturing time. It had the disadvantage of high cost.

Furthermore, in order to smoothly raise and lower the damper 9, it is necessary to use a cylindrical lifting member 1 having a thickness of a predetermined diameter or more.
1, but the cylindrical lifting member 11
The thicker the cylindrical elevating member 11
Since the sliding resistance between the thread groove 12 of the damper 9 and the thread groove 13 of the damper 9 becomes large, the cylindrical lifting member 11
It is also necessary to prepare a large motor for rotationally driving the motor, which also has the disadvantage of increasing manufacturing costs.

SUMMARY OF THE INVENTION Therefore, a technical object of the present invention is to provide a rooftop ventilation fan that is not affected by wind pressure on the roof of a factory, warehouse, etc. or wind pressure during exhaust, and can reduce manufacturing costs.

[Technical means and actions to solve problems]

In order to solve such technical problems, in the present invention, the drive mechanism includes a screw rod, a pair of runners that are screwed into the screw rod, and one end of which is rotatably attached to the runner. and a pair of arms, the other end of which is rotatably attached to the covered member, and a motor that rotationally drives the screw rod, and as the screw rod rotates, each of the runners is driven. The cover member is moved up and down by changing the expansion angle of the arm by approaching or separating the arm.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings. Incidentally, the same members as those in the prior art are given the same reference numerals, and the explanation thereof will be omitted.

As shown in FIG. 1, the drive mechanism 18 in the rooftop ventilation fan 17 according to the present embodiment is attached to a holder plate 24 provided on the back surface of the hood 22, and the drive mechanism 18 is attached to a screw rod 19 and a screw rod A pair of runners 20 and 21 screwed into 19
and four arms 25, one end of which is rotatably supported by the runners 20, 21, and the other end of which is rotatably supported by the damper 23, which is a covered member, via a holding member 40. , 26, 41, 42 and a motor 2 for rotationally driving the screw rod 19.
7. The screw rod 19 has a forward threaded portion 28 carved from the center toward one end, and a reverse threaded portion 29 carved toward the other end. And the screw rod 19
Guide rods 31 and 32 are respectively provided on both sides of the screw rod 19 and both ends of the guide rods 31 and 32 are fixed by a holder member 30. The forward threaded portion 28 and reverse threaded portion 29 of this screw rod 19 are
The runners 20 and 21 each having a rectangular parallelepiped shape are screwed together with a screw hole 33.
The guide rods 31 and 32 pass through holes 34 and 35 formed on both sides of the rod.

Ends of a pair of arms 25, 26 are rotatably supported on the side surfaces of the respective runners 20, 21, and the other ends of the arms 25, 26 have a U-shaped side surface. Each of the holding members 40 is pivotally supported by the rising pieces 37, and this holding member 40 is fixed to the surface portion of the damper 23. Therefore, in the rooftop ventilation fan 17 according to this embodiment, the plurality of arms 25, 26, 41, 42 and the runner 20,
21 and the holding member 40 constitute a link mechanism. In addition, the reference numeral 36 is a control unit for the motor 27, and in FIG. 2, the reference numeral 38 is a conduit, and 39
is a resin packing attached to the periphery of the damper 23.

In the rooftop ventilation fan 17 according to this embodiment, the damper 23 is normally in the lowest position as shown in FIG. The ventilator opening 1 is closed in the pressed state. During ventilation, the motor 27 is energized to rotate the screw rod 19. In this case, as the screw rod 19 rotates, the runner 20 screwed into the forward threaded portion 28
The runner 21 screwed into the reverse threaded part 29 moves along the thread grooves of the normal threaded part 28 and the reverse threaded part 29 so as to be separated from each other. Then, as shown in FIG. 3, the arms 25, 26, 41, 42
The tip of the damper 2 gradually moves upward.
Lift 3 upward. Then, the fully open position of the damper 23 is detected by an appropriate fully open position detection means, and by stopping the voltage supply to the motor 27, the rotation of the screw rod 19 is stopped, and the damper 23 is stopped in the fully open state.

On the other hand, when closing the ventilator opening,
Voltage is supplied to the motor 27 to drive the motor 27 in reverse, thereby causing the screw rod 19 to rotate in the reverse direction. In this case, contrary to the above, two runners 2
0 and 21 move toward each other along the thread grooves of the forward threaded portion 28 and the reverse threaded portion 29. The tips of the arms 25, 26, 41, and 42 suspend the damper 23 downward while gradually moving downward.
Then, the fully closed position of the damper 23 is detected by an appropriate fully closed position detection means, the voltage supply to the motor 27 is stopped, the rotation of the screw rod 19 is stopped, and the damper 23 is fully closed as shown in FIG. Stops in closed state.

In the rooftop ventilation fan 17 according to this embodiment, the drive mechanism 18 is attached to a holder plate 24 provided on the back side of the hood 22, and the damper 23 is lifted and suspended from above to open the ventilator opening 1. It is configured to open and close, and the drive mechanism 18 is covered by the damper 23 when soot and smoke from the factory is discharged outdoors, so soot and smoke do not directly hit the drive mechanism 18. . Therefore, it is possible to prevent the conventional situation in which dirt due to soot or oil smoke adheres between the cylindrical lifting member and the damper, and the damper does not move up and down smoothly after many years of use.

Further, in the above embodiment, the drive mechanism 18 is attached to the holder plate 2 disposed on the back surface of the hood 22.
4 and the ventilator opening 1 is opened and closed by lifting or suspending the damper 23. However, as shown in FIGS. 4 and 5, the drive mechanism 18 is installed directly above the fan 3. The damper 23 may be arranged in the ventilator opening 1, and the ventilator opening 1 may be opened and closed by lifting or lowering the damper 23. That is, in this embodiment, the ventilator main body base 4 forming the ventilator opening 1
Attach the frame material 43 across the upper end of the
The drive mechanism 18 is mounted on the frame member 43. Therefore, in this embodiment, when opening the ventilator opening 1, the motor 27 is driven to rotate the screw rod 19 and bring the runners 20 and 21 closer together. In this case, as shown in FIG.
1 and 42 gradually rise, and each arm 25 and 2
The tips of 6, 41, and 42 move upward, and the damper 23 also rises. Then, as in the embodiment described above, the fully open position of the damper 23 is detected by an appropriate fully open position detection means, and the damper 23 is brought into the fully open state.

Furthermore, FIGS. 6 and 7 show a third embodiment of the rooftop ventilation fan according to the present invention. In the rooftop ventilation fan 44 according to this embodiment, unlike the first and second embodiments, the hood 22 itself is used as the covering member, and the damper is omitted. That is, the drive mechanism 18 is attached to the ventilator opening 1 via the frame material 43 as in the second embodiment, and the drive mechanism 18 is attached to the ventilator opening 1 via the frame material 43, and
The tips of 26, 41, and 42 are fixed to the hood 22 via the holding member 40, and under normal conditions, the hood 22 is placed so as to cover the ventilator main body base 4, as shown in FIG. Occasionally, the arms 25, 26, 41, 42 are raised to lift the hood 22 above the ventilator opening 1, as shown in FIG.

Unlike the above embodiments, the rooftop ventilation fan 44 according to this embodiment does not include a damper, so the number of component parts can be reduced and manufacturing costs can be reduced. Furthermore, they do not usually protrude above the roof of a warehouse or factory as a rooftop ventilation fan, but only protrude above the roof during ventilation.
Since it does not constantly protrude from the roof of a warehouse or factory as in the past, it is possible to improve the appearance quality of the warehouse or factory.

〔Effect of the invention〕

The present invention has the above-mentioned configuration, and unlike the conventional art, since a plurality of arms support the covering member, it can be used even when wind pressure on the roof of a factory, warehouse, etc. or wind pressure during exhaust is applied. However, it is possible to prevent the situation where the covering member is affected and cannot be opened or closed as in the conventional case.

Further, in the present invention, even if the size of the gap between the ventilator main body base and the hood changes depending on the exhaust capacity of the rooftop ventilation fan, the air gap provided at the ventilator opening By changing the interval at which the runners screwed together with the screw rods approach and separate, and by changing the degree of expansion of each arm, it is possible to adjust the interval at which the covered member rises and falls. Therefore, even if the size of the gap between the ventilator main body base and the hood changes depending on the difference in exhaust capacity, it can be accommodated, and it can be accommodated even if the size of the gap between the ventilator body base and the hood changes depending on the difference in exhaust capacity of rooftop ventilation fans. Accordingly, there is no need to prepare multiple types of drive mechanisms, and manufacturing costs can be reduced.

Furthermore, in the present invention, the drive mechanism is configured by supporting the covered member by a plurality of arms, and screwing a pair of runners, each of which is supported by the arms, onto a screw rod. The load can be distributed and supported by a pair of runners via multiple arms, and the torque acting on the screw rod can be smaller than before, so the motor used can also be made smaller than before. This has the effect of reducing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of a drive mechanism for a rooftop ventilation fan according to the present invention, and FIG. 2 is a perspective view showing a first embodiment of a rooftop ventilation fan according to the present invention.
- A sectional view corresponding to line A, showing a fully closed state of the damper as a covered member; FIG. 3 is a cross-sectional view taken along the line A-A of FIG. 1 showing the first embodiment of the rooftop ventilation fan according to the present invention 4 and 5 show a second embodiment of the rooftop ventilation fan according to the present invention;
FIG. 4 is a sectional view corresponding to the line A-A in FIG. 1, showing a case where the drive mechanism is attached to the ventilator opening and moves up and down a damper as a covered member disposed above the drive mechanism; FIG. 4 is a sectional view of the damper; 5 shows the damper in the fully closed state, and FIGS. 6 and 7 show the third part of the rooftop ventilation fan according to the present invention.
FIG. 6 is a cross-sectional view corresponding to the line A-A in FIG. 1 showing a case where a hood is used as a covering member in the embodiment, FIG. 6 is a diagram showing the hood in a fully closed state, and FIG. FIG. 8, which shows the fully open state, is a sectional view showing a conventional rooftop ventilation fan. 1... Ventilator opening, 2, 27... Motor, 3... Fan, 10... Drive mechanism, 19...
Screw Rott, 20, 21...Runner, 2
2...Hood, 23...Damper, 25, 26,
41, 42...Arm.

Claims (1)

[Claims] 1. A motor disposed within a ventilator opening, a fan rotationally driven by the motor, a covering member covering the ventilator opening, and a drive for opening and closing the covering member. In the rooftop ventilation fan having a mechanism, the drive mechanism includes a screw rod, a pair of runners screwed to the screw rod, one end of which is rotatably attached to the runner, and the other end of which is attached to a covering member. It has a pair of arms rotatably attached to the screw rod, and a motor that rotationally drives the screw rod, and as the screw rod rotates, the respective runners approach or separate, thereby expanding the arms. A rooftop ventilation fan characterized in that the covering member is raised and lowered by changing the opening angle. 2. The rooftop ventilation fan according to claim 1, wherein the covering member comprises a flat damper having approximately the same diameter as the ventilator opening. 3. The rooftop ventilation fan according to claim 1, wherein the covering member comprises a hood having a larger diameter than the ventilator opening. 4. Claim 2, wherein the drive mechanism is installed in the ventilator opening and moves up and down a damper disposed above the drive mechanism.
Rooftop ventilation fan as described in section. 5. The rooftop ventilation fan according to claim 3, wherein the drive mechanism is provided on the back side of the hood and moves up and down a damper disposed below the drive mechanism. 6. Claim 3, wherein the drive mechanism is installed in the ventilator opening and moves up and down a hood disposed above the drive mechanism.
Rooftop ventilation fan as described in section.