JP2002022257A - Ventilation damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation damper which is able to close a path by it self utilizing airflow when the airflow of a certain speed is generated by large pressure difference between indoor and outdoor generated to the path, to open the path certainly when the wind speed decreases, to reduce the driving force required to generally force fins directed towards the direction the path opens and to certainly close the path by itself with desired wind speed. SOLUTION: A ventilation damper 1 is provided with a frame 5 in which having a path 4 having an inlet hole 2 and an outlet hole 3, a fin 6 rotatively arranged inside the frame 5 opening and closing the path 4 by the rotation in the direction of R1 and R2, a rotating means rotating forcibly the fin 6 in the direction of R2 to have the fin 6 open and close the path 4 and a resilient means resisting the free rotation in the direction of R2 of the fin 6 heading for the position of closing the path 4, wherein the free rotation in the direction of R2 of the fin 6 heading for the path closing position is allowed when the fin 6 is rotated towards the path opening position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the ventilation between indoor and outdoor areas of business buildings, office buildings, apartment houses, detached houses, warehouses, etc. It relates to a controlled ventilation damper.

[0002]

Generally, in this type of ventilation damper, fins are rotatably arranged in a frame defining a passage, and the degree of opening of the passage is determined by the rotation of the fins. The degree of ventilation through is controlled.

In such a ventilation damper, if a large air pressure difference occurs between the inside and outside of the room due to the blowing of a wind having a certain speed or more outside the room in the open state of the passage, air is unnecessarily drawn out to the room through the passage. When entering the room, unpleasant airflow is generated inside the room, and dust outside the room is brought into the room.
An undesired situation may occur such that the state in which the temperature of the room is set to a predetermined temperature is greatly disturbed, and power consumption of the air conditioning increases to correct this.

For this reason, when the wind speed is higher than a certain value,
Ventilation dampers that can naturally block passages are preferred, but conversely, when the wind speed is reduced, the fact that the passages can be opened naturally and naturally is also a factor in this type of ventilation damper. Therefore, a ventilation damper has been proposed in which the fins for opening and closing the passage are constantly biased in the passage opening direction.

[0005] Such a ventilation damper has characteristics that can satisfy the above-mentioned requirements for the time being. However, in this damper, when the rotation resistance of the portion for supporting the fins is large, the rotation resistance is large. According to the size, the urging force for constantly urging the fins in the direction of opening the passage is increased,
Thus, when the wind speed decreases, it is necessary to ensure that the passage is opened. However, if such an urging force is increased, the passage will not be blocked only at the time of strong wind, and the natural wind speed will be reduced at the desired wind speed. Thus, the original function of being able to close the passage is destroyed.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a method for generating a large air pressure difference between the inside and outside of a room to generate an airflow having a flow rate higher than a certain value in a passage. This air flow can be used to naturally block the passage,
Thus, unpleasant airflow can be prevented from being generated inside the room, dust outside can be prevented from being brought into the room, and power consumption for air conditioning can be reduced, and stable passage opening and closing can be performed. In addition, when the wind speed decreases, the passage can be reliably opened, and the urging force for constantly urging the fins in the passage opening direction can be reduced, so that the passage can be naturally blocked at the desired wind speed. An object of the present invention is to provide a reliable ventilation damper.

[0007]

According to a first aspect of the present invention, there is provided a ventilation damper comprising: a frame having a passage having an entrance hole and an exit hole therein; And a fin arranged movably, and when the fin is turned to the passage opening position, the fin is allowed to freely rotate toward the passage closing position. The frame integrally includes an upper wall, a lower wall disposed to face the upper wall downward, and a pair of side walls facing each other in the axial direction. And a passage having an outlet hole is formed so as to be surrounded by the upper wall portion, the lower wall portion, and the side wall portion, and the fins are formed integrally with the shaft portion and radially opposite to each other in the radial direction from the shaft portion. And a pair of fin body portions And a pair of flange bodies fixed to each other, and is always urged to rotate toward the passage opening position, and the fin body is moved in the direction toward the passage closing position by the airflow passing through the passage. Each flange body is disposed in a circular hole formed in a corresponding side wall portion, and a corresponding bearing is provided via a rolling bearing disposed in the circular hole. It is rotatably supported by the side wall.

According to the ventilation damper of the first aspect, since the fin body has a tip portion that generates a rotational moment in the direction toward the passage closing position due to the airflow passing through the passage, the fin body can be used inside or outside the room. When a large pressure difference is generated and an air flow having a certain flow rate or more, for example, an air flow of 3 m / sec or more is generated in the passage, the passage can be naturally blocked by using this air flow. By this, air is unnecessarily introduced into and out of the room through the passage, thereby preventing unpleasant airflow from being generated in the room and eliminating the possibility of bringing outside dust into the room. The air conditioning condition of the fins is not greatly disturbed, and the power consumption of the air conditioning can be reduced.In addition, each flange body fixed to the end surface of the fin main body is supported through rolling bearings arranged in a circular hole. Rotatably supported on the side wall As a result, the rotational resistance of the fin becomes extremely small, so that the passage can be reliably opened when the wind speed decreases, and the urging force for constantly urging the fin in the passage opening direction is reduced. Can, and
The passage can be reliably closed naturally at a desired wind speed.

In the ventilation damper of the present invention, preferably, like the ventilation damper of the second aspect, an inner ring of a rolling bearing is fitted on the outer peripheral surface of each flange body so as to be relatively movable in the axial direction. An O-ring is interposed between the outer peripheral surface of each flange body and the corresponding inner ring of the rolling bearing. As in the ventilation damper of the third embodiment, the outer ring of the rolling bearing has side walls formed in the corresponding circular holes. It is tightly fixed to the part.

When the collar body is relatively movable in the axial direction with respect to the rolling bearing as in the ventilation damper of the second aspect, expansion and contraction due to thermal expansion of the fin shaft and the fin body can be absorbed. In addition, if an O-ring is interposed between the flange body and the rolling bearing, it is possible to prevent air from flowing in and out of a gap between the flange body and the bearing.

[0011] In the ventilation damper according to any one of the first to third aspects, preferably, as in the fourth aspect of the present invention, one fin body is heavier than the other fin body. The fins are constantly urged to rotate toward the passage opening position due to the difference in weight between the pair of fin body portions.

In order to obtain a difference in weight between the pair of fin bodies as in the ventilation damper of the fourth aspect, the pair of fin bodies are formed axially symmetric with respect to the shaft, and one of the fin bodies is formed. To make a cavity in the other fin body, or add a weight to one fin body,
Further, one fin body may be formed longer than the other fin body so that the pair of fin bodies are asymmetric with respect to the shaft.

In the present invention, instead of or together with the fin body being constantly biased by the difference in the weight of the fin body so as to rotate the fin toward the passage opening position as described above, a ventilation damper according to a fifth aspect is provided. In addition, further comprising elastic means against the free rotation of the fin toward the passage closed position,
The fins may be constantly biased by elastic means so as to rotate toward the passage opening position.

In the ventilation damper of the present invention, preferably, as in a sixth aspect, the tip and one surface of the fin body near the tip are curved so as to be convex, and Is curved so as to be concave.

In a ventilation damper according to a seventh aspect of the present invention, in the ventilation damper according to any one of the above aspects, a pair of side closing members are fixed to each side wall, and each flange body has a small diameter flange. Part and a large diameter flange are integrally formed, each side closing member has an arcuate surface that is always in contact with the outer peripheral surface of the small diameter flange of the flange body, and the fin is located at the passage closing position. When the fin body is rotated, the fin body has a plane that contacts each edge in the axial direction and a curved surface that is connected to the plane. The large-diameter flange of each flange body has a corresponding side wall. It is arranged in a circular hole formed in the portion, and is rotatably supported on a corresponding side wall portion via a rolling bearing arranged in the circular hole.

The ventilation damper of the present invention further comprises, as in an eighth aspect thereof, a turning means for turning the fin so as to open and close the passage by the fin, wherein the turning means comprises: A rotating power generating means; and a transmitting means for transmitting the rotating power generated by the rotating power generating means to the fin, wherein the transmitting means closes the passage when the fin is rotated to the passage opening position. The free rotation of the fin toward the position is allowed.

The transmission means in the ventilation damper according to the eighth aspect includes a connecting member having one end attached to a flange body, like the ventilation damper according to the ninth aspect of the present invention, and the other end of the connecting member having a fin. Even if it is configured to have a circular arc slit engaged with play in the rotating direction and to have a rotatable member connected to the rotating power generating means, together with or instead of such a configuration, Like the ventilation damper according to the tenth aspect of the present invention, a rotatable member connected to the turning power generating means, an arc slit provided in the flange body, one end is fixed to the rotatable member, and the other end is a fin. And a connecting member engaged with the circular arc slit with play in the rotation direction of.

The rolling bearing in the ventilation damper of the present invention may be any of a ball bearing, a roller bearing, and a needle bearing. In short, any rolling bearing that can sufficiently reduce the rotational resistance of the fin with respect to the sliding bearing is used. Good.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention and its embodiments will be described in more detail with reference to preferred examples shown in the drawings. The present invention is not limited to this example.

1 to 7, a ventilation damper 1 according to the present embodiment includes a frame 5 having a passage 4 having an inlet hole 2 and an outlet hole 3 therein, and opening and closing the passage 4 by turning in directions R1 and R2. Fins 6 rotatably arranged in a frame 5 and a rotating means 7 for forcibly rotating the fins 6 in the R2 direction so that the fins 6 open and close the passage 4.
And a resilient means 20 for resisting free rotation of the fin 6 in the R2 direction toward the passage closing position. As described later, the fin 6 rotates to the passage opening position (the position shown in FIG. 2). Then, the fin 6 is allowed to freely rotate in the R2 direction toward the passage closing position.

The frame 5 includes an upper wall 31 and an upper wall 3
1 is integrally provided with a lower wall portion 32 arranged to face downward and side walls 33 and 34 axially facing each other.
2 and a passage 4 including an inlet hole 2 and an outlet hole 3 formed by being surrounded by side wall portions 33 and 34, respectively, to prevent rainwater intrusion and birdproof plate 37 and dustproof mesh 3 from entering the outdoor unit 35 and the indoor unit 36, respectively.
8 open through each of them.

A rainwater intrusion prevention and birdproof plate 37 having a plurality of eaves and openings is provided with a horizontal sash 39 on which the frame 5 is mounted.
, And 40, and the dustproof net 38 is
Mounted on

The fin 6 includes a hollow shaft portion 41 and a shaft portion 41.
And a pair of fin body portions 42 and 43 formed integrally and radially and axially symmetrically in this example, and closely correspond to respective end surfaces of the shaft portion 41 and the fin body portions 42 and 43. And a pair of disk-shaped flange members 8 and 9 integrally fixed to each other, and the fin body portions 42 and 43 are curved at the tip portions 16 and 17 and in the vicinity thereof.

The tip 16 and one surface 101 of the fin body 42 in the vicinity thereof are curved so as to be convex toward a curved surface 83 described later, that is, to be convex. The surface 102 is curved so as to be a concave surface complementary to the surface 101, and similarly, the front surface 17 and one surface 103 of the fin body 43 in the vicinity thereof protrude toward a curved surface 84 described later. That is, the surface 104 is curved so as to be convex, and the other surface 104 is
It is curved so as to have a concave surface complementary to 03. Such tip portions 16 and 17 and the fin body portion 4 in the vicinity thereof
When the air flow A is generated in the passage 4 in the open state of the passage 4 by the fins 6 (the position shown in FIG. 2), the fin body 42 has a lift toward the curved surface 83.
The fin body 43 generates a lift force toward the curved surface 84, and the fin 6 is rotated by a rotation moment based on the lift force so as to move toward the passage closing position.

The collar body 8 includes a small-diameter flange 44 and a small-diameter flange 44.
The flange body 9 integrally has a large-diameter flange portion 53 having a larger diameter than the small-diameter flange portion 45 and the large-diameter flange portion 54 larger than the small-diameter flange portion 45. ing. The large-diameter flange portion 53 is formed with a cylindrical portion 46 that extends integrally from the large-diameter flange portion 53, and one end of a rotatable shaft 52 is fixed to the large-diameter flange portion 54.

The large-diameter flange portion 53 of the collar body 8 is disposed in a circular hole 85 formed in
Are rotatably supported by the side wall portion 33 via a rolling bearing 86 disposed on the side surface. The large-diameter flange portion 54 of the flange body 9 is also disposed in a circular hole 87 formed in the side wall portion 34. The side wall portion 34 is provided via a rolling bearing 88 disposed in the circular hole 87.
The outer peripheral surfaces of the large-diameter flange portions 53 and 54 have inner rings 89 of rolling bearings 86 and 88, respectively.
O-rings 71 and 73 for sealing are provided between the outer peripheral surfaces of the large-diameter flange portions 53 and 54 and the inner rings 89 and 90, respectively. Are interposed, and each of the O-rings 71 and 73 is
The outer rings 91 and 92 of the rolling bearings 86 and 88 are fitted in respective grooves formed on the outer peripheral surfaces of the large diameter flanges 53 and 54, respectively. It is tightly fixed to each of 33 and 34.

In this embodiment, as described above, each of the flange members 8 and 9 is configured to have the small-diameter flange portions 44 and 45 and the large-diameter flange portions 53 and 54, respectively. Each of 53 and 54 is rotatably supported on each of the side wall portions 33 and 34 via each of the rolling bearings 86 and 88. However, each of the flange members 8 and 9 is connected to each of the small-diameter flange portions 44 and 45 and You may comprise only each one of the large diameter flange parts 53 and 54.

The frame 5 constantly contacts the outer peripheral surfaces 10 and 11 of the small-diameter flanges 44 and 45, in addition to the upper wall 31 and the side walls 33 and 34, and the rotating means 7
When the fin 6 is turned to the passage closing position (the position shown in FIG. 1) by the
And a pair of side closing members 14 and 15 made of an elastic body such as rubber attached to the side walls 33 and 34 and protruding toward the passage 4 in the axial direction so as to contact the pair of side closing members 14 and 15. When the fin 6 is turned to the passage closed position by the turning means 7 by bridging the fin 15, the upper wall 31 and the lower wall 32 are brought into contact with the tips 16 and 17 of the fin 6. It further has distal end closing members 18 and 19 each made of an elastic body such as rubber and the like attached thereto.

The side wall 3 is arranged symmetrically with respect to the shaft 41.
Each of the pair of side closing members 14 fixed to the outer surface 3 has an arcuate surface 7 that is always in contact with the outer peripheral surface 10 of the small-diameter flange portion 44 of the flange body 8.
7 and 78, and when the fin 6 is turned to the passage closed position, the fin body portions 42 and 43, which are the axial edges 12 of the fin 6, are attached to the respective axial edges. It has planes 81 and 82 that are in contact and curved surfaces 83 and 84 that are connected to the planes 81 and 82.

The side wall 3 is arranged symmetrically with respect to the shaft 41.
Each of the pair of side closing members 15 fixed to 4 also
Like each of the pair of side closing members 14, each of the pair of side closing members 14 has an arc surface (not shown) that is always in contact with the outer peripheral surface 11 of the small-diameter flange portion 45 of the flange body 9, and the fin 6 is in the passage closing position. When rotated, a plane (not shown) that contacts the respective axial edges of the fin bodies 42 and 43, which are the axial edges 13 of the fin 6, and a curved surface (not shown) connected to the plane. (Not shown).

The distal end closing member 18 is fitted to the upper wall 31 between the side closing members 14 and 15 on the upper wall 31 side, and at both ends thereof, the upper wall 31 side is closed. The tip closing members 19 are fitted to the side closing members 14 and 15, respectively, and the tip closing members 19 are connected to the side closing members 14 and 1 on the lower wall 32 side.
5 is fitted to the lower wall portion 32, and at both ends thereof, the side closing members 14 and 15 on the lower wall portion 32 side.
It is fitted to.

The rotating means 7 includes a reversible electric motor 61 as a rotating power generating means, and a transmitting means 62 for transmitting the rotating power generated by the reversible electric motor 61 to the fins 6. The reversible electric motor 61 is mounted on a base 63 connected to the frame 5, and the transmission means 62 is mounted on the base 63 to reduce the rotation of the output rotation shaft of the reversible electric motor 61. 64, a rotatable shaft 51 which is connected to an output shaft of a reduction gear mechanism 64 and is rotatably supported on a base 63 via a bearing 65, and a disk-shaped rotatable shaft fixed to the rotatable shaft 51. One end of each of the member 47 and a pair of arc slits 48 and 49 formed in the rotatable member 47 has a rotation direction R1 of the fin 6.
And a pair of columnar pins 50 and 55 as a connecting member integrally attached to the large-diameter flange 53 at the other end thereof. The arc slits 48 and 49 are formed on the rotatable member 47 in an axisymmetric manner, and the pins 50 and 55 are also implanted in the large diameter flange 53 in an axisymmetric manner.

The rotating means 7 rotates the rotatable member 47 in the R1 and R2 directions via the reduction gear mechanism 64 and the rotatable shaft 51 by the operation of the reversible electric motor 61, and the rotation of the rotatable member 47 causes an arc. The large-diameter flange portion 53 is rotated through the cylindrical pins 50 and 55, each of which is engaged with one end of each of the slits 48 and 49, thereby rotating the fin 6 so as to open and close the passage 4. It has become.

The elastic means 20 has one end 56 connected to the large-diameter flange 53 of the flange body 8 and the other end 57 connected to the side wall 33 of the frame 5 via a connection fitting 58, and is disposed around the cylindrical portion 46. The torsion coil spring 59 is provided.
Has one end fixed to the side wall portion 33 via a screw 60, the other end of which is hooked to the other end 57 of a coil spring 59. The coil spring 59 moves the fin 6 toward the open position of the passage 4. The large-diameter flange portion 53 of the flange body 8 is always elastically urged in the R1 direction so that is rotated in the R1 direction. Thus, the fin 6 is constantly urged in the R1 direction by the coil spring 59 so as to rotate toward the open position of the passage 4.

The rotatable shaft 52 fixed to the large-diameter flange portion 54 is rotatably supported via a bearing 76 on a base 75 connected to the frame 5.

The ventilation damper 1 is moved from the state in which the fin 6 closes the passage 4 (the position shown in FIGS. 1, 6 and 7).
And a detector (not shown) for detecting the position of each fin 6 up to a state where the fins are opened (positions shown in FIGS. 2, 8 and 9). Based on the detection signal from the vessel, the operation is controlled so that the opening of the passage 4 by the fins 6 is set to a predetermined value.

In the above-described ventilation damper 1, when the reversible electric motor 61 is operated at its fully opened position in the passage 4 shown in FIGS.
Correspond to the pins 50 and 5 with the arc slits 48 and 49, respectively.
5 is rotated in the R2 direction through engagement with each of the two, and both edges 12 and 13 thereof come into contact with the side closing members 14 and 15, respectively, as shown in FIG. 17 are arranged in a state of contacting the distal end closing members 18 and 19 to close the passage 4. In this state, the flow of air through the passage 4 is blocked by the fins 6.

When the reversible electric motor 61 is operated and its output rotation shaft is reversed from the state of the fins 6 shown in FIGS. 1, 6 and 7, the elastic force of the coil spring 59 urges the reversible electric motor to rotate the fins. Reference numeral 6 is rotated so that the passage 4 shown in FIGS. 2, 8 and 9 is fully opened. In this state, the air outside the room 35 and inside the room 36 is circulated through the passage 4.

In the ventilation damper 1, as shown in FIGS. 2, 8 and 9, when the fin 6 is turned to the passage opening position, the fin 6 freely rotates in the R2 direction toward the passage closing position. In addition to the above, the fin body portions 42 and 43 are bent as described above in the vicinity of the tip portions 16 and 17 and the rotational moment in the R2 direction is applied to the fin 6 by the air flow A in the passage 4. Since the elastic force of the coil spring 59 against the free rotation in the R2 direction of the fin 6 toward the passage closed position is appropriately set, the elastic force of the coil spring 59 is set based on the large pressure difference between the indoor and outdoor 36 and 35. From outdoor 35 to indoor 36 or from indoor 36 to outdoor 3
Air flow A at a flow rate above a certain value to 5, for example 3 m / sec
When the above airflow A is generated in the passage 4, the fin 6 can be naturally rotated in the direction R <b> 2 toward the passage closed position, and the passage 4 can be reliably closed. Due to the large pressure difference between the indoor and outdoor 36 and 35, air is unnecessarily introduced into and out of the indoor 36 through the passage 4,
Unpleasant airflow A can be prevented from being generated in the room 36, dust from the outside 35 can be prevented from being brought into the room 36, and power for air conditioning can be reduced.

Further, in the ventilation damper 1, the fin body 4
Each of the flange bodies 8 and 9 fixed to the end faces of 2 and 43,
Since the fins 6 are rotatably supported in the R1 and R2 directions by the corresponding side walls 33 and 34 via the rolling bearings 86 and 88 disposed in the circular holes 85 and 87, the fin 6 rotates in the R1 and R2 directions. The resistance can be made very small and therefore
Stable passage opening and closing can be performed, and when the wind speed decreases, the passage can be surely opened. In addition, the coil spring 59 that constantly biases the fins 6 in the R1 direction toward the passage opening position is provided. As a result of the elastic force being sufficiently small, natural passage blockage by the air flow can be started at a desired air flow velocity, and the degree of freedom in design can be increased.

While the coil spring 59 is omitted, the fin body 42 is made heavier than the fin body 43, and the fin 6 is rotated toward the passage opening position due to the difference in weight between the fin bodies 42 and 43. Even when the fins 6 are constantly urged as described above, the rolling bearings 86 and 88 extremely reduce the rotational resistance of the fins 6 in the R1 and R2 directions, so that the same effect as described above can be obtained.

In the ventilation damper 1, the side closing member 1
4 and 15 and the distal end closing members 18 and 19 are made of an elastic material, so that both edges 12 and 13 of the fin 6 and the distal ends 16 and 17 can be pressed tightly against each other with an elastic reaction force. Thus, the passage 4 can be more completely closed. In addition, the outer peripheral surface 10 of the flange members 8 and 9 corresponding to the side closing members 14 and 15 of the ventilation damper 1
And 11 come into contact with each other in an arc surface, so that the side
And 15 and the outer peripheral surfaces 10 and 11 of the collar bodies 8 and 9 can completely eliminate air leakage.

In addition, in the ventilation damper 1, the side closing members 14 and 15 and the fins 6 each have a curved surface, and the curved surfaces come into contact with each other. Since the closure can be achieved more completely and the collar bodies 8 and 9 are axially movable with respect to the rolling bearings 86 and 88, the shaft 41 of the fin 6 and the fin body 42 and 43 Since O-rings 71 and 73 are interposed between the flanges 8 and 9 and the rolling bearings 86 and 88, expansion and contraction due to thermal expansion can be absorbed.
, 9 and the rolling bearings 86 and 88 can be prevented from flowing in and out of the gap.

In the ventilation damper 1, the fins 6 are rotated by electric power, the passage 4 is inclined,
And the outlet hole 3 is opened in the horizontal direction, respectively. However, the present invention is not limited to these. For example, the fin 6 may be manually rotated, and the passage 4 may be extended horizontally. Further, the outlet hole 3 may be opened in the vertical direction.

[0045]

According to the present invention, when a large air pressure difference occurs between the inside and outside of a room and an air flow having a flow velocity of a certain level or more is generated in the passage, the passage can be naturally blocked by utilizing the air flow. Therefore, unpleasant airflow can be prevented from being generated in the room, and the introduction of dust outside the room into the room can be eliminated.
In addition to being able to reduce the power consumption of the air conditioning, it is possible to open and close the passage stably, and furthermore, to reliably open the passage when the wind speed decreases, and to always urge the fins in the passage opening direction. It is possible to provide a ventilation damper which can reduce the urging force and can surely naturally block the passage naturally at a desired wind speed.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a preferred embodiment of the present invention in a state in which a passage is closed.

FIG. 2 is a longitudinal sectional view of the example shown in FIG. 1 in a state where a passage is opened.

FIG. 3 is a longitudinal sectional view of the example shown in FIG. 1 without fins.

FIG. 4 is an explanatory diagram of the example shown in FIG.

FIG. 5 is an enlarged explanatory view of the example shown in FIG. 1 from the inside of the room.

FIG. 6 is a view showing VI in FIG. 4 in a state where a passage is closed by a fin;
FIG. 6 is a sectional view taken along line VI.

FIG. 7 is a view showing VI in FIG. 4 in a state where the passage is closed by the fins;
FIG. 7 is a cross-sectional view taken along line I-VII.

FIG. 8 is a view showing VI in FIG. 4 in a state where the passage is opened by the fins;
FIG. 6 is a sectional view taken along line VI.

FIG. 9 shows the VI shown in FIG. 4 in a state where the passage is opened by the fins.
FIG. 7 is a cross-sectional view taken along line I-VII.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ventilation damper 2 Inlet hole 3 Outlet hole 4 Passage 5 Frame 6 Fin 8 and 9 Flange body 16 and 17 Tip part 31 Upper wall part 32 Lower wall part 33 and 34 Side wall part 41 Shaft part 42 and 43 Fin body part 85 and 87 Circular holes 86, 88 Rolling bearing

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Nobutaka Sato, Inventor Nippon Sekkei Co., Ltd. 6-5-1, Nishishinjuku, Shinjuku-ku, Tokyo (72) Koji Hirose, Inventor Koji Hirose 6-5-1, Nishishinjuku, Shinjuku-ku, Tokyo Nippon Sekkei Co., Ltd. (72) The inventor Takashi Yanai 6-5-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Nippon Sekkei Co., Ltd. (72) Inventor Tsugio Kuroki 1-3-2, Shibadaimon, Minato-ku, Tokyo OILES INDUSTRIES Co., Ltd. (72) Inventor Hiroshi Yamamoto 1118, Ideniwa, Ritsuto-cho, Kurita-gun, Shiga Prefecture Inside the Oil Industry Co., Ltd. (72) Inventor Takashi Hasegawa 1-3-2 Shiba-Daimon, Minato-ku, Tokyo F-term (reference) 3L081 AA03 AB01 FC03 HA01 HA02 HA07 HB04

Claims (10)

[Claims] 1. A frame having a passage having an inlet hole and an outlet hole therein, and a fin rotatably disposed in the frame so as to open and close the passage by rotation. Is a ventilation damper adapted to allow free rotation of the fin toward the passage closing position when it is turned to the passage opening position, wherein the frame has an upper wall and And a pair of side walls that are opposed to each other in the axial direction and are integrally provided, and a passage having an inlet hole and an outlet hole is an upper wall portion and a lower wall. The fin is formed so as to be surrounded by the portion and the side wall portion, and the fin includes a shaft portion, a pair of fin body portions integrally formed to extend in opposite directions in the radial direction from the shaft portion, and a fin body portion. A pair of flanges integrally fixed to the end surface. In addition, the fin body is constantly urged to rotate toward the passage opening position, and the fin body has a tip portion that generates a rotational moment in a direction toward the passage closing position by an airflow passing through the passage, A ventilation damper in which each flange is disposed in a circular hole formed in a corresponding side wall and is rotatably supported on the corresponding side wall via a rolling bearing disposed in the circular hole. 2. An inner race of a rolling bearing is relatively movably fitted in an axial direction on an outer peripheral surface of each flange body, and is provided between an outer peripheral surface of each flange body and an inner race of a corresponding rolling bearing. The ventilation damper according to claim 1, wherein an O-ring is interposed. 3. The ventilation damper according to claim 1, wherein the outer ring of the rolling bearing is tightly fixed to the side wall at the corresponding circular hole. 4. The one fin body is heavier than the other fin body, and the fins are constantly urged to rotate toward the passage opening position due to the difference in weight between the pair of fin bodies. The ventilation damper according to any one of claims 1 to 3, wherein 5. The apparatus according to claim 1, further comprising elastic means for preventing free rotation of the fin toward the passage closing position, wherein the fin is constantly urged by the elastic means to be rotated toward the passage opening position. The ventilation damper according to any one of claims 1 to 4. 6. The fin body according to claim 1, wherein one surface of the fin body and the fin body in the vicinity thereof are curved so as to be convex, and the other surface is curved so as to be concave. 5
A ventilation damper according to any one of the preceding claims. 7. A pair of side closing members are fixed to each side wall portion, each flange body has a small diameter flange portion and a large diameter flange portion integrally, and each side closing member is Has an arcuate surface that is constantly in contact with the outer peripheral surface of the small-diameter flange portion of the flange body, and contacts the respective axial edges of the fin body when the fin is rotated to the passage closing position. And a curved surface connected to the flat surface, and the large-diameter flange portion of each flange body is arranged in a circular hole formed in a corresponding side wall portion and is arranged in the circular hole. The ventilation damper according to any one of claims 1 to 6, wherein the ventilation damper is rotatably supported on a corresponding side wall portion via a rolling bearing. 8. A rotating means for rotating the fin so as to open and close the passage by the fin, wherein the rotating means includes a rotating power generating means and a rotating power generated by the rotating power generating means. Transmitting means for transmitting the fins to the fins, wherein the transmitting means allows free rotation of the fins toward the passage closing position when the fins are rotated to the passage opening position. Item 8. The ventilation damper according to any one of Items 1 to 7. 9. The transmission means has a connecting member having one end attached to the flange body, and an arc slit in which the other end of the connecting member engages with play in the rotating direction of the fin, and generates a rotating power. 9. A ventilation damper according to claim 8, comprising a rotatable member coupled to the means. 10. The transmitting means includes a rotatable member connected to the rotating power generating means, an arc slit provided in the flange, and one end fixed to the rotatable member, and the other end in the rotation direction of the fin. The ventilation damper according to claim 8, further comprising: a connecting member engaged with the arc slit with play.