JPH08338649A - Shutter mechanism for ventilation fan - Google Patents

Abstract

PURPOSE: To prevent a temperature fuse from being influenced by a switching operation of a ventilation fan by a method wherein the direction of a biasing force of a biasing means influencing the temperature fuse for keeping a shutter opening or closing mechanism is set to the direction differing from the direction where an action due to the operation of an operation switch is carried out. CONSTITUTION: A temperature fuse 8 is applied between a fuse fixing claw in a shutter lock plate 5 and a fuse fixing claw of a rod supporting plate 14 and then the shutter lock plate 5 and the rod supporting plate 14 are fixed to each other. A spring 13 biases the shutter lock plate 5 in a shutter closing direction and then a rod 15 has its one end engaged with a through-pass hole formed at a part where a rod engaging groove and a rod supporting groove are overlapped to each other. In this case, an action performed by the operation of a switch 12 transmitted through the rod 15 is applied to the shutter lock plate 5, but is not applied to the rod supporting plate 14. Accordingly, the temperature fuse 8 may be sufficiently one having a force against the biasing force of a spring 13 and so it is not influenced by a strong force generated instantly by the operation of the switch 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter mechanism for a burner fan used in a kitchen or the like for preventing fire from burning when a fire occurs.

[0002]

2. Description of the Related Art FIG. 13 is a sectional view showing a conventional ventilation fan, and FIG. 14 is a partially enlarged view thereof, in which 1 is a ventilation fan main body and 2 is a front surface (inside the room) of the ventilation fan main body. An orifice 3 is provided on the rear side (outdoor side) of the ventilating fan main body 1 and rotates about a shutter pin 1a as a fulcrum to open and close an air passage of the ventilating fan 4, and 4 is a shutter 3
Is a shutter connecting plate for connecting the shutter lock plate 5 and the opening / closing operation in conjunction with each other, 5 is a shutter lock plate for preventing the shutter 3 from opening when the operation of the ventilation fan is stopped, and 6 is an upper rod whose one end is hooked on the shutter lock plate 5.

Reference numeral 7 is a rod slide plate in which a fulcrum 7a is formed on one side and rod grooves 7b are formed in a direction connecting both sides so that the fulcrum 7a side is slightly higher, and the other end of the upper rod 6 is the rod slide plate. It is hooked on the groove 7b. 8 is a thermal fuse attached to the other side of the rod slide plate 7, 9
Is a fuse fixing plate whose one side is pivotally attached to the fulcrum 7a and the other side is attached to the thermal fuse 8. As shown in FIG. 6, the rod slide plate 7 and the fuse fixing plate 9 rotate about the fulcrum 7a with respect to each other. It is constructed freely, and its rotation is restricted by the temperature fuses 8 attached to the other side.

One end of 10 is a fulcrum 7a of the fuse fixing plate 9.
The lower rod 11 is hooked to the side of the fuse fixing plate 9, one end is hooked to the temperature fuse 8 side of the fuse fixing plate 9, and the other end is a support rod hooked to the position fixed to the ventilation fan main body 1, 12
Is a switch that is hooked to the other end of the lower rod 10 and hangs outside the ventilation fan main body 1, and 13 is a spring that biases the shutter lock plate 5 in the shutter closing direction. And this spring 13
The upper rod 6 is normally locked by the fulcrum 7a side by the urging force of.

Next, the operation will be described. Normally, the shutter 3 is opened and closed by operating the switch 12 in conjunction with the rotation of a propeller fan (not shown).
Similarly, it closes in conjunction with the stop of the propeller fan. When the shutter is opened, the lower rod pulls the fulcrum 7a side of the fuse fixing plate 9 by pulling the switch 12, and the fulcrum 7a side of the rod slide plate 7, the upper rod 6, and the shutter lock plate 5 also move downward. Pulled, shutter 3
Is opened and held in the open position. Similarly, when the shutter is closed, the shutter lock plate 5 is pulled downward again to release the holding of the open position and the spring 1 is released.
The tension of 3 holds the shutter closed position.

When the shutter is opened and an abnormally high temperature such as a fire occurs, the thermal fuse 8 is cut by the heat, and the rod slide plate 7 and the fuse fixing plate 9 are fulcrum 7.
It becomes rotatable about a. Shutter lock plate 5
Is always biased in the shutter closing direction by the spring 13, the upper rod slides in the slide groove 7b of the rod slide plate 7 while the rod slide plate 7 rotates, and the shutter lock plate 5 moves in the biasing direction. And the shutter 3 is closed.

The temperature fuse 8 plays the role of restricting the rotation of the rod slide plate 7 and the fuse fixing plate 9 in this way, and the operation by the switch operation is as shown in FIG. Like the distribution, the thermal fuses 8 are considerably dispersed and applied. Therefore, the thermal fuse 8 is mainly subjected to a force against the biasing force of the spring 13, so that the influence of frequent switch operations can be dispersed,
The life of the thermal fuse is improved.

[0008]

Since the shutter mechanism of the conventional ventilation fan is constructed as described above, a large force may be momentarily applied to the temperature fuse by the switch operation. The force exerted has a great influence on the thermal fuse against a stable sustaining force such as the urging force of the spring, which causes a problem of shortening the life. Therefore, even if the force is distributed, the thermal fuse needs to be durable against switch operation, and a more expensive thermal fuse with good durability must be used, and the options are limited. There was a problem.

Further, the urging force for urging the shutter lock plate in the shutter closing direction at the time of disconnecting the thermal fuse and the operation of the switch operation for opening and closing the shutter by the switch both come from the rod slide plate through the upper rod. Since it is transmitted to the shutter lock plate, the thermal fuse that regulates the biasing force of the spring is naturally subject to the action of the switch operation, and it is difficult to remove only the action of the switch operation. It was And
In the end, the thermal fuse has a problem that it is required to have durability against frequent switch operations.

In order to solve such a problem,
For example, as disclosed in Japanese Utility Model Application Laid-Open No. 56-47428, there is a system in which the action by the switch operation and the urging force of a spring for urging the shutter in the closing direction act separately. However, in the case of the prior art disclosed in the publication, the temperature fuse provided so as to resist the biasing force of the spring is provided between the locking piece of the operating body and the interlocking plate on the shutter side that constitute the operating system by the switch operation. It also has the function of holding the locked state.

When the thermal fuse is cut, the locking state between the locking piece of the operating body and the interlocking plate is released, while the biasing force of the spring guides the shutter in the closing direction.
Since the direction in which the locking state of the locking piece and the interlocking plate is maintained is the same as the direction against the action at the time of operating the switch,
Actually, the tensile force acting on the operating body is dispersed and transmitted to the thermal fuse, and in the end, the same problem as the above-mentioned conventional technique remains.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a shutter mechanism for a ventilation fan that is not deteriorated by the temperature fuse without being affected by the switch operation of the ventilation fan. To do.

[0013]

A shutter mechanism for a ventilation fan according to the present invention includes a shutter for opening and closing an air passage of the ventilation fan,
An operation switch that opens and closes the shutter, a lock mechanism that locks the shutter in a closed state when the operation of the ventilation fan is stopped in conjunction with the operation of the operation switch, and the operation mechanism that locks the lock mechanism by the urging force of an urging unit. A shutter closing mechanism for releasing the shutter to close the shutter, and a temperature fuse for holding the shutter closing mechanism in the non-released state against the urging force of the urging means. The direction of the urging force of the urging means is set to a direction different from the direction in which the action of the operation switch operates.

Further, the shutter closing mechanism is added to the lock mechanism.

The urging means includes a first urging means for urging the lock mechanism to be released from the operation switch, and a first urging means for urging the shutter closing mechanism to close the shutter. And two urging means.

Further, the closed state is locked by the lock mechanism by the urging force of the urging means.

[0017]

In the present invention, the thermal fuse is applied with a force against the biasing force of the biasing means for releasing the lock mechanism by the shutter closing mechanism, and the action when opening and closing the shutter by the operation switch is not affected. Does not reach.

Further, the urging means exerts both the urging force for the shutter closing mechanism to release the lock mechanism and the urging force for the locking mechanism to lock the shutter in the closed state when the operation of the ventilation fan is stopped. .

Further, the thermal fuse receives an urging force from the first urging means for releasing the lock mechanism by the shutter closing mechanism, and the shutter closing mechanism releases the shutter by the second urging means other than this. Energize to close.

Further, the urging means has both the urging force for the locking mechanism to lock the shutter in the closed state and the urging force for the shutter closing mechanism to close the shutter when the operation of the ventilation fan is stopped. Exert.

[0021]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing a shutter mechanism of a ventilation fan according to the present embodiment, and FIG. 2 is a partially enlarged view of FIG.
Is a ventilating fan main body, 2 is an orifice attached to the front surface of the ventilating fan main body, 3 is a metal member that is provided on the rear (outdoor side) side of the ventilating fan main body 1 and rotates around a shutter pin 1a as a fulcrum to open and close the air passage of the ventilating fan. The shutters 4 are shutter connecting plates that connect the three shutters 3 and interlock the opening and closing operations.

Reference numeral 5 denotes a shutter lock plate which prevents the shutter 3 from opening when the ventilation fan is not operating. The shutter lock plate 5 is rotatably provided around a fulcrum 5b which is slightly deviated to the shutter side from the vicinity of the center of the upper part. The connecting plate 4 is operated in the shutter opening / closing direction. Further, in the vicinity of the center of the lower part, a notch-shaped rod hooking groove 5 is formed from the bottom to the shutter side.
c is formed, and a fuse fixing claw 5a is provided on the lower anti-shutter side.

The upper shutter side of 14 is concentrically mounted on a fulcrum 5b, and the shutter lock plate 5 is centered on the fulcrum 5b.
Is a rod support plate that can be rotated independently of each other, and has a notch-shaped rod support groove 14b at its lower end, which is in the shape of a letter "T", so that the rear part comes to a position overlapping with the rear part of the rod hooking groove 5c. And a fuse fixing claw 14a is provided on the upper side opposite to the shutter side.

Numeral 8 is bridged between the fuse fixing claw 5a of the shutter lock plate 5 and the fuse fixing claw 14a of the rod support plate 14, and the shutter lock plate 5 and the rod support plate 14 are provided.
Thermal fuses for fixing and 13, shutter lock plate 5
Is a spring for urging the shutter in the shutter closing direction, 15 is a rod whose one end is locked in a through hole formed in the overlapping portion of the rod hanging groove 5c and the rod supporting groove 14a, and 12 is a rod 15
Is a switch for operation which is hooked at the other end of the fan and hangs down to the outside of the ventilation fan main body 1.

Next, the operation will be described. In the normal state, when the shutter 3 is opened, the switch 12 is temporarily pulled to lock the shutter 3 in the opened state as shown in FIG. Ventilation operation is performed by rotating. 2 shows a state of the shutter lock plate 5 and the rod support plate 14 when the shutter 3 is opened.
Is operated by the switch 12 at that time and the spring 13
FIG. 6 is a conceptual diagram showing how the urging force of (3) acts on the shutter lock plate 5 and the rod support plate 14.

In FIG. 3, the solid line arrow indicates the action by the operation of the switch 12, and the broken line arrow indicates the urging force of the spring 13. As is clear from this figure, the operation of the switch 12 transmitted through the rod 15 is applied to the shutter lock plate 5,
It does not cover the rod support plate 14. Therefore, the thermal fuse 8 only needs to have a force against the biasing force of the spring 13, and is not affected by a large force instantaneously generated by the operation of the switch 12.

FIG. 4 is a sectional view showing a state in which the shutter 3 is closed. When the shutter 3 is closed, the switch 12 is pulled again to release the shutter open state.
As shown in FIG.
Moves in the closing direction of the shutter 3, and the shutter lock plate 5 fixed by the temperature fuse 8 also moves in the closing direction. Also at this time, the operation by the operation of the switch 12 transmitted through the rod 15 is applied to the shutter lock plate 5,
It does not cover the rod support plate 14.

Further, in conjunction with the operation of the switch 12, the energization of the motor (not shown) is stopped at the same time, and the rotation of the propeller fan is also stopped, whereby the ventilation operation is completed. Even after the shutter 3 is closed, the shutter lock plate 5 holds the shutter 3 in the closed state by the urging force of the spring 13.

Next, when a fire or the like occurs when the shutter 3 is in an open state and the temperature inside the ventilation fan rises to an abnormal temperature, the temperature fuse 8 is cut by heat, and the shutter lock plate 5 and the rod support plate 14 are separated. The fixed state is released, and each becomes rotatable about the fulcrum 5b. As a result, the rod support plate 14 starts rotating clockwise due to the biasing force of the spring 13, while the shutter lock plate 5 starts rotating counterclockwise because the fulcrum 5b is slightly biased toward the shutter side. Further, the leftward rotation of the shutter lock plate 5 causes the rod 15 to start moving in a direction away from the rod hooking groove 5c.

FIG. 5 is a sectional view showing the state of the ventilation fan at such an abnormal temperature, and FIG. 6 shows the state of the shutter lock plate 5 and the rod support plate 14 at that time. By rotating both in opposite directions, rod hook groove 5c
The overlapping portions of the rod supporting groove 14 and the rod supporting groove 14 move to the respective inlets of the cutouts, and as shown in FIG.
5 comes out of both grooves. And rod 15
The shutter lock plate 5 and the rod support plate 14 are rotatable, and the shutter 3 is spring 13
The air passage of the ventilation fan is closed by the urging force of.

According to the above structure, when the shutter 3 is opened / closed by the switch 12, its action is transmitted from the rod 15 to the shutter lock plate 5, but not to the rod support plate 14, so that the temperature fuse is used. 8 is not affected at all. Therefore, the thermal fuse 8 has a spring 1
It is sufficient that the durability against the biasing force of No. 3 is sufficient, a cheaper thermal fuse than the conventional one can be used, and the options are expanded.

Further, since the shutter lock plate 5 and the rod support plate 14 are fixed by the thermal fuse 8, the structure from the spring 13 to the thermal fuse 8 is affected by the urging force of the spring 13 and the operation of the switch 12. Since there is no common transmission part, the thermal fuse 8 can be completely unaffected by the switch operation. Further, since the conventional thermal fuse fixing plate can be omitted and the number of rods can be reduced, the structure can be simplified, the reliability of the device can be improved, and the cost can be reduced. Furthermore, the assembly work is greatly improved by reducing the number of rods that are troublesome in the assembly work.

Further, although the thermal fuse 8 is not affected by the switch operation, a spring for urging the shutter in the closing direction in a normal shutter closed state and a spring for urging the shutter in a closed state in an abnormal state. Are commonly used, and it is possible to prevent the number of parts from easily increasing to obtain the above effect.

Embodiment 2 FIG. 7 is a sectional view showing the shutter mechanism of the ventilation fan in the present embodiment, and FIG. 8 is a partially enlarged view of FIG. 7, in which the same or corresponding components as in Embodiment 1 are designated by the same reference numerals and their description Is omitted. 6 is an upper rod whose one end is hooked on the lower center of the shutter lock plate 5, and the other end is hooked on one side of the rod support plate 14, and 9 is a pin 14c which is provided on the rod support plate 14 substantially at its center. The fuse fixing plate 10, which is pivotally attached about a fulcrum, is a lower rod whose one end is hooked on the other side of the rod support plate 14 and the other end is hooked on the switch 12.

A fuse fixing claw 14a is provided below the pin 14c of the rod supporting plate 14, and a notch-shaped rod supporting groove 14b is formed further below the fuse fixing claw 14a. A spring hooking claw 14d is provided above the pin 14c. Pin 1 of fuse fixing plate 9
A fuse fixing claw 9a is provided below 4c, and the temperature fuse 8 is bridged between the fuse fixing claw 9a and the fuse fixing claw 14a.

A notch-shaped rod fixing groove 9c is formed in the center of the lower portion of the fuse fixing plate 9, and the inner portion thereof overlaps with the inner portion of the rod supporting groove 14b to form a through hole, in which the lower rod 10 is formed. Be hung up. A spring hooking claw 9b is provided above the pin 14c. The spring hooking claw 9b and the spring hooking claw 1 are provided.
The fuse holding spring 16 is hung between the 4d and 4d. A line connecting the upper rod 6 and the lower rod 10 of the rod support plate 14 connects the fuse fixing claw 9a and the fuse fixing claw 14a, and the spring hooking claw 9b and the spring hooking claw 1 are connected.
It is orthogonal to the line connecting 4d.

Next, the operation will be described. In the normal state, when the shutter 3 is opened, the switch 12 is pulled once to lock the shutter 3 in the open state as shown in FIG. 7, and at the same time, the motor (not shown) is energized, and the propeller fan is driven by the drive of this motor. Ventilation operation is performed by rotating. FIG. 8 shows a state of the rod support plate 14 and the fuse fixing plate 9 when the shutter 3 is opened, and FIG. 9 shows the action by the operation of the switch 12 and the biasing force of the spring 16 at the rod supporting plate 14 and the fuse fixing plate 9 at that time. It is a conceptual diagram which shows how it extends.

In FIG. 9, the solid line arrow indicates the action by the operation of the switch 12, and the broken line arrow indicates the urging force of the spring 16. As is apparent from this figure, the operation of the switch 12 transmitted through the rod 15 is applied to the rod support plate 14 and is not applied to the fuse fixing plate 9. Further, the biasing force of the spring 13 is not applied. Therefore, the thermal fuse 8 only needs to resist the biasing force of the spring 16 and is not affected by the large force generated momentarily by the operation of the switch 12.

FIG. 10 is a sectional view showing a state in which the shutter 3 is closed. When the shutter 3 is closed, the switch 12 is pulled again to release the shutter open state, and the shutter lock plate 5 is moved in the closing direction by the urging force of the spring 13 as shown in FIG. Also at this time, the operation of the switch 12 transmitted through the rod 15 is applied to the rod support plate 14 and is not applied to the fuse fixing plate 9.

Further, in conjunction with the operation of the switch 12, the energization of a motor (not shown) is stopped at the same time, and the rotation of the propeller fan is also stopped, whereby the ventilation operation is completed. Even after the shutter 3 is closed, the shutter lock plate 5 holds the shutter 3 in the closed state by the urging force of the spring 13.

Next, when a fire or the like occurs while the shutter 3 is in the open state and the temperature inside the ventilation fan rises to an abnormal temperature, the temperature fuse 8 is cut by heat, and the rod support plate 14 and the fuse fixing plate 9 are separated. Fixed state is released, each pin 1
4c is a fulcrum and it becomes a state which can be rotated. As a result, the rod support plate 14 and the fuse fixing plate 9 are pulled above the pin 14c by the urging force of the spring 16, and the pin 1
4c rotate in opposite directions with respect to the fulcrum.

FIG. 11 is a sectional view showing the state of the ventilation fan at such an abnormal temperature, and FIG. 12 shows the state of the rod support plate 14 and the fuse fixing plate 9 at that time. By rotating both in opposite directions, the rod support groove 1
4b and the rod fixing groove 9c are overlapped with each other.
4b, the lower rod 10 moves to the entrance side of the cutout shape, and eventually the lower rod 10 comes out of the rod support groove 14b as shown in FIG. Then, the lower rod 15 falls out of the rod fixing groove 9c by its own weight, the rod support plate 14 is released, and the shutter 3 is closed by the biasing force of the spring 13 to close the air passage of the ventilation fan.

The characteristic feature of this embodiment is that the spring 16 and the shutter 3 that serve as a biasing force for rotating the rod support plate 14 for removing the lower rod 10 and the fuse fixing plate 9 are closed. The point is that the temperature fuse 8 needs only to resist the urging force of the spring 16 and is separate from the spring 13 that serves as the urging force. That is, in the case of Example 1,
The spring 13 needs an urging force for closing the shutter 3, and the thermal fuse 8 has a large force depending on the weight of the shutter 3 and the like.
The force of the spring 16 that closes the does not affect the thermal fuse.

Therefore, the thermal fuse is composed of the rod support plate 14
A simple one that restricts the rotation of the fuse fixing plate 9 and the fuse fixing plate 9 can be used, and the cost can be further reduced. of course,
The same effect as that of the first embodiment can be obtained. Further, even for a conventional product in which a thermal fuse is interposed between the upper rod and the lower rod as shown in FIG. 13, by interposing the rod support plate 14 of this embodiment between these two rods. The configuration of this embodiment can be easily realized.

In the first embodiment, the shutter lock mechanism is composed of the shutter lock plate 5 and the spring 13, and the shutter closing mechanism is composed of the shutter lock plate 5, the rod support plate 14 and the spring 13. On the other hand, in the second embodiment, the shutter lock mechanism is composed of the shutter lock plate 5 and the spring 13, and the shutter closing mechanism is the shutter lock plate 5, the spring 13, the upper rod 6, the rod support plate 14, the fuse fixing plate 9 and the spring. It consists of 16. The first biasing means corresponds to the spring 16 and the second biasing means corresponds to the spring 13.

[0046]

As described above, according to the present invention, the shutter that opens and closes the air passage of the ventilation fan, the operation switch that opens and closes the shutter, and the operation of the operation switch when the operation of the ventilation fan is stopped. A lock mechanism that locks the shutter in a closed state; a shutter closing mechanism that releases the lock mechanism from the operation switch by a biasing force of a biasing means to close the shutter; and a biasing force of the biasing means. And a temperature fuse that holds the shutter closing mechanism in a non-released state, and the direction of the urging force of the urging means that acts on the temperature fuse is different from the direction in which the action of the operation switch operates. Since it is set, the thermal fuse does not have the effect of operating the operating switch, and the thermal fuse is not momentarily loaded with a large load. The effect is obtained that the deterioration of the figure can be prevented.

Further, since the shutter closing mechanism is provided in addition to the lock mechanism, the number of parts can be reduced, the cost can be reduced, and the assembling property can be improved.

The urging means includes first urging means for urging the lock mechanism to release from the operation switch, and the shutter closing mechanism for urging the shutter closing mechanism to close the shutter. With the urging means of 2,
Since the thermal fuse is not subjected to the biasing force of the biasing means for closing the shutter, the temperature fuse can be selected without being affected by the weight of the shutter.

Further, since the closed state is locked by the lock mechanism by the urging force of the urging means, it is possible to share an action system having a common function and to simplify the structure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a ventilation fan in a shutter open state according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a conceptual diagram showing the action distribution of FIG.

FIG. 4 is a cross-sectional view showing the ventilation fan in the shutter closed state according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a ventilation fan when the thermal fuse is cut according to the first embodiment of the present invention.

6 is a partially enlarged view of FIG.

FIG. 7 is a sectional view showing a ventilation fan according to a second embodiment of the present invention with a shutter open.

FIG. 8 is a partially enlarged view of FIG.

9 is a conceptual diagram showing the action distribution of FIG.

FIG. 10 is a cross-sectional view showing a ventilation fan with a shutter closed according to a second embodiment of the present invention.

FIG. 11 is a sectional view showing a ventilation fan when a thermal fuse is cut according to a second embodiment of the present invention.

FIG. 12 is a partially enlarged view of FIG.

FIG. 13 is a cross-sectional view showing a conventional ventilation fan.

FIG. 14 is a partially enlarged view of FIG.

FIG. 15 is a conceptual diagram showing the action distribution of FIG.

[Explanation of symbols]

3 shutters, 4 shutter interlocking plate, 5 shutter lock plate, 6 upper rod, 8 thermal fuse, 9
Fuse fixing plate, 10 lower rod, 12 switch, 13 spring, 14 rod support plate, 15 rod, 16 fuse holding spring

Claims (4)

[Claims] 1. A shutter that opens and closes an air passage of a ventilation fan, an operation switch that opens and closes the shutter, and a lock mechanism that locks the shutter in a closed state when the operation of the ventilation fan is stopped in association with the operation of the operation switch. A shutter closing mechanism that releases the lock mechanism from the operation switch by the urging force of the urging means to close the shutter.
A temperature fuse that holds the shutter closing mechanism in a non-released state against the biasing force of the biasing unit, and the direction of the biasing force of the biasing unit that extends to the temperature fuse is determined by operating the operation switch. A shutter mechanism for a ventilation fan, wherein the shutter mechanism is set in a direction different from the direction in which the action is exerted. 2. The shutter mechanism for the ventilation fan according to claim 1, wherein the shutter closing mechanism is provided in addition to the lock mechanism. 3. The first biasing means for biasing the lock mechanism to release the lock mechanism from the operation switch, and the biasing means for biasing the shutter closing mechanism to close the shutter. The shutter mechanism for a ventilation fan according to claim 1, further comprising: 4. A shutter mechanism for a ventilation fan according to claim 1, wherein the locking of the closed state by the lock mechanism is performed by an urging force of the urging means.