CN104969009A

CN104969009A - Shutter opening/closing mechanism and ventilation fan

Info

Publication number: CN104969009A
Application number: CN201380072381.8A
Authority: CN
Inventors: 安田雄一
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2013-03-05
Filing date: 2013-03-05
Publication date: 2015-10-07
Anticipated expiration: 2033-03-05
Also published as: MY188465A; JPWO2014136209A1; WO2014136209A1; JP5921760B2; CN104969009B

Abstract

A shutter opening/closing mechanism (100) has: a rectangular frame body (10); shutter plates (20a, 20b, 20c) installed rotatably to the frame body (10) at shutter rotary shafts (41a, 41b, 41c) provided to positions towards one side edge (22a, 22b, 22c) of shutter surfaces (21a, 21b, 21c); shutter arms (40a, 40b, 40c) that are affixed towards one side edge (22a, 22b, 22c) and are each inclined with respect to the shutter plates (20a, 20b, 20c); and a spring (50) that is provided across shutter arm (40a) and shutter arm (40b). By means of selectively attaching one end of the spring (50) to either a spring attachment section (45a2) or a spring attachment section (45a1) provided to shutter arm (40a), it is possible to alter the characteristics of the torque assisting the opening/closing of shutter plate (20a).

Description

Shutter switching mechanism and ventilation fan

Technical field

The present invention relates to shutter switching mechanism and ventilation fan, particularly relate to the shutter switching mechanism of wind pressure type and there is the ventilation fan of this shutter switching mechanism.

Background technology

In the past, wall ventilation fan (hereinafter referred to as " ventilation fan ") and its shutter switching mechanism were formed as structure as follows.

That is, ventilation fan is installed on the through hole be formed on wall, has: framework, has and props up support integral and the function being fixed in wall, at indoor and outside opening respectively; Motor, is supported by framework; Fan, is detachably fixed on the rotating shaft of motor by circulator (fixed cell); And the aperture that can load and unload, be fixed in framework, surround fan and form wind-tunnel.

Then, controlled the power supply supplied by power cable by dragline type switch etc., thus drive fan (motor) rotates, and forms air-flow, by indoor air-changing between the air and the air of outside of indoor.

Further, framework has for when not taking a breath by indoor and outdoors cut off shutter.Such as, when fan (motor) starts and forms air-flow by fan, owing to pushing the pressure of shutter, the shutter open (indoor and outdoors connection) of wind pressure type, when fan (motor) stops, fan does not form air-flow, the distress resolves of pushing shutter, shutter is closed (being cut off by indoor and outdoors).

Shutter has the multiple louver boards configured in parallel with each other, the position at multiple louvered top edge rotatably can be arranged at framework on shutter axle parallel respectively, and shutter rotates in the mode that the scope at louvered edge is on the lower outstanding to outside.In addition, the position at multiple louvered top edge is fixed with respectively to the outstanding shutter arm in indoor, the end of the indoor of multiple shutter arm is connected with web respectively on the connection shaft being arranged at this end.

That is, multiple shutter axle and multiple connection shaft parallel to each other, the face (imaginary plane) being configured with multiple shutter axle parallel with the face (imaginary plane) being configured with multiple connection shaft (such as with reference to patent document 1).

Prior art document

Patent document

Patent document 1: the real miniature goods (the 1st page, Fig. 1, Fig. 3) of being willing to clear No. 61-139472 (opening clear No. 63-46738 in fact) of Japan

Summary of the invention

The problem that invention will solve

Fig. 5 A ~ Fig. 6 B illustrates the generation situation of the torque in shutter switching mechanism, Fig. 5 A is the partial side view representing deadweight direction when being installed on wall etc., Fig. 5 B is the partial side view representing deadweight direction when being installed on ceiling etc., to be the correlation curve figure of the relation representing shutter open angle when being installed on wall and torque, Fig. 6 B be Fig. 6 A represents the correlation curve figure of the relation of shutter open angle when being installed on ceiling and torque.

In shutter switching mechanism, based on blast torque from pressure in nature be the torque that shutter is opened and more reduced, therefore under identical flow conditions, in order to open shutter further, need to produce assist torque by having shutter opening and closing auxiliary body, offset the torque in the direction that shutter is closed, or reduce louvered quality to reduce the torque self of closing direction.

In Fig. 5 A and Fig. 5 B, the torque in the direction that louver board 20c closes due to deadweight by the quality m of louver board 20c and distance L, the line segment OG of gravity acceleration g, the center of gravity G of louver board 20c and the pivot O of louver board 20c when louver board 20c closes and the opening surface angulation ψ of framework 10 and shutter open angle θ determine.

I.e., when wall (with reference to Fig. 5 A), represented by " mgLsin (ψ+θ) ", when ceiling is installed (with reference to Fig. 5 B), represented by " mgLcos (ψ+θ) ".

In addition, with in the multiple louvered situation being linked same shape by the mode of equal angular action on louver board 20c, the total of the torque in the direction closed due to deadweight can be obtained by quality m being replaced as multiple louvered total quality in above-mentioned formula.

In the correlation curve figure of the torque shown in Fig. 6 A and shutter open angle θ, the torque characteristics of closing direction when wall describes sinusoidal (sin) curve.In the correlation curve figure of the torque shown in Fig. 6 B and shutter open angle θ, the torque characteristics of closing direction when ceiling is installed describes cosine (cos) curve.On the other hand, be identical torque characteristics based on the torque of the shutter opening direction of blast and no matter the posture of ventilation fan is how.

The curve map intersection point of the torque of closing direction and the torque of opening direction is the angle that shutter balance stops.Therefore, open shutter further in order under the state that remains unchanged in the torque of the opening direction based on blast described above, need the torque reducing closing direction.

But in the torque characteristics of sinusoidal torque characteristics and cosine curve, the reduction amplitude required for the torque being less than opening direction to make the torque of closing direction is different.

Namely, when utilizing shutter opening and closing auxiliary body to offset the torque of closing direction, the ventilation fan of wall is different with the characteristic of the best assist torque in the ventilation fan that ceiling is installed, when wall, shutter is more opened, and assist torque more needs to increase, on the other hand, when ceiling is installed, no matter how shutter open angle θ produces constant assist torque, or shutter is more opened, and assist torque more reduces.

Due to this difference, use the ventilation fan of shutter switching mechanism when changing its mounting position, there is shutter cannot the danger of action smoothly, therefore wall with and ceiling install with in adopt different shutter switching mechanisms, or use the material of the light weight such as aluminium or resin as louvered material thus become and only utilize blast to open louvered specification.

That is, there are the following problems, needs special-purpose member when being divided into wall ventilation fan and ceiling installation ventilation fan, thus production efficiency is low, when louver board uses light material, material cost uprises, or makes the purposes of ventilation fan be limited due to heat resistance.

The object of the present invention is to provide and to be a kind ofly made up of the parts identical with the ventilation fan of existing band wall special wind pressure type shutter and the ventilation fan that also can be used in that ceiling installs.

For solving the means of problem

The feature of the shutter switching mechanism that the present invention relates to is to have: rectangular-shaped framework; Plural louver board, the position by the lateral edges of a side can rotate freely the earth's axis and be supported on described framework; Web, the mode of simultaneously carrying out on-off action with this louver board links this louver board each other; Spring, installs in the mode connected by a pair louver board in described louver board; And spring mountings, the louver board of at least one party in described a pair louver board is provided with two or more, one square end portion of described spring can be installed, select any one spring mountings in described two or more spring mountings, one square end portion of described spring is installed on this selected spring mountings, thus changes the characteristic to the torque that described louvered opening and closing is assisted.

Invention effect

The shutter switching mechanism that the present invention relates to can, by changing the correlation properties of the installation site of spring and the torque relative to the generation of shutter open angle switching shutter switching mechanism, therefore use identical parts just can provide a kind of ventilation fan (ventilation fan of band wind pressure type shutter) can installing both sides corresponding to wall and ceiling.

In addition, in the present invention, so-called " spring " is also defined in " helical spring etc. " shown in literal, is also included in and strides across a pair parts when linking, can be changed the elastomer of the power acted between this pair object by the distance changed between this pair object.

Accompanying drawing explanation

Figure 1A be illustrate the shutter switching mechanism that embodiments of the present invention 1 relate to, represent correspond to wall when shutter close time side view.

Figure 1B be illustrate the shutter switching mechanism that embodiments of the present invention 1 relate to, represent the side view of shutter when opening when corresponding to wall.

Fig. 2 A be illustrate the shutter switching mechanism that embodiments of the present invention 1 relate to, represent correspond to ceiling install when shutter close time side view.

Fig. 2 B be illustrate the shutter switching mechanism that embodiments of the present invention 1 relate to, represent the side view of shutter when opening corresponded to when ceiling is installed.

Fig. 3 A schematically shows its length of the shutter switching mechanism shown in Figure 1A and Figure 1B when shutter full cut-off and the side view of torque brachium.

Fig. 3 B schematically shows its length of the shutter switching mechanism shown in Figure 1A and Figure 1B when shutter open angle is 30 ° and the side view of torque brachium.

Fig. 3 C schematically shows its length of the shutter switching mechanism shown in Figure 1A and Figure 1B when shutter open angle is 60 ° and the side view of torque brachium.

Fig. 4 A schematically shows Fig. 2 A and its length of the shutter switching mechanism shown in Fig. 2 B when shutter full cut-off and the side view of torque brachium.

Fig. 4 B schematically shows Fig. 2 A and its length of the shutter switching mechanism shown in Fig. 2 B when shutter open angle is 30 ° and the side view of torque brachium.

Fig. 4 C schematically shows Fig. 2 A and its length of the shutter switching mechanism shown in Fig. 2 B when shutter open angle is 60 ° and the side view of torque brachium.

Fig. 5 A is the partial side view in the deadweight direction representing the shutter switching mechanism shown in Figure 1A and Figure 1B etc.

Partial side view that Fig. 5 B is the generation state of the torque of key diagram 2A and the shutter switching mechanism shown in Fig. 2 B, that represent deadweight direction when being installed on wall etc.

Fig. 6 A is the correlation curve figure representing the shutter open angle of the shutter switching mechanism shown in Figure 1A and Figure 1B and the relation of torque.

Fig. 6 B is the correlation curve figure representing the shutter open angle of Fig. 2 A and the shutter switching mechanism shown in Fig. 2 B and the relation of torque.

Fig. 7 A be illustrate the ventilation fan that embodiments of the present invention 2 relate to, by the stereogram (situation of wall) that schematically shows of each isolation of components ground.

Fig. 7 B be illustrate the ventilation fan that embodiments of the present invention 2 relate to, by the stereogram (ceiling install situation) that schematically shows of each isolation of components ground.

Detailed description of the invention

[embodiment 1]

Figure 1A ~ Fig. 2 B illustrates the shutter switching mechanism that embodiments of the present invention 1 relate to, Figure 1A represents side view when closing corresponding to shutter when wall, Figure 1B represents side view when opening corresponding to shutter when wall, Fig. 2 A is side view when representing that shutter when installing corresponding to ceiling is closed, and Fig. 2 B is the side view of the shutter representing when installing corresponding to ceiling when opening.In addition, have an X-rayed a part (sidewall of framework) for parts and schematically show in each figure, the present invention is not limited to illustrated form.

In Figure 1A ~ Fig. 2 B, shutter switching mechanism 100 has: the rectangular-shaped framework 10 (for sidewall 12,14 and framework 10, please refer to Fig. 7) of being surrounded by sidewall 11,12,13,14; And louver board 20a, 20b, 20c, can rotatably be arranged at sidewall relative in framework 10 12,14 (the below of louver board 20a and above be configured with louver board 20b and louver board 20c respectively).

Louver board 20a, 20b, 20c have shutter face 21a, 21b, 21c of substantially rectangular shape, on shutter rotating shaft 41a, 41b, 41c on the position of lateral edges 22a, 22b, 22c by a side (upside in Fig. 1) being arranged at shutter face 21a, 21b, 21c, louver board 20a, 20b, 20c can rotatably be arranged at framework 10.

And, on the position of lateral edges 22a, 22b, the 22c by a side, be fixed with shutter arm 40a, 40b, the 40c of to tilt relative to shutter face 21a, 21b, 21c (relative to shutter face 21a etc. not parallel or not on the same face), shutter arm 40a, 40b, 40c are connected to each other by web 30 on link rotating shaft 43a, 43b, 43c of being arranged at shutter arm 40a, 40b, 40c.

And then, on shutter arm 40a, spring mountings 45a1 is being provided with away from the position (upside) of shutter arm 40b relative to the imaginary line connecting shutter rotating shaft 41a and link rotating shaft 43a, at the imaginary line relative to connection shutter rotating shaft 41a and link rotating shaft 43a by the position (downside) of shutter arm 40b is provided with spring mountings 45a2, in addition, shutter arm 40b is provided with spring mountings 45b.

And, when corresponding to wall, striding across spring mountings 45a1 and spring mountings 45b and spring 50 (with reference to Figure 1A, Figure 1B) is installed.On the other hand, when corresponding to ceiling and installing, stride across spring mountings 45a2 and spring mountings 45b and spring 50 (with reference to Fig. 2 A, Fig. 2 B) is installed.

That is, when corresponding to wall and when corresponding to ceiling and installing, the position that a square end portion of spring 50 installs to shutter arm 40a is different.Now, because spring 50 is installed under the state of extending or compress, thus have in the upper effect of shutter arm 40a and shutter arm 40b (louver board 20a and louver board 20b) and make its upper torque rotated in the opposite directions to each other.

At this, stride across shutter arm 40a and shutter arm 40b ground mounting spring 50, but the present invention is not limited thereto, also can substitutes shutter arm 40b and spring mountings 45c is set on shutter arm 40c, striding across shutter arm 40c and shutter arm 40a ground mounting spring 50.

And the present invention is not limited to three louver boards 20a, 20b, 20c, as long as louver board two or more, quantity is not limit.

It should be noted that, hereinafter, when common content being described for all parts (position), omitting the suffix " a, b, c " of parts (position) institute target mark.

And also a part for louver board 20 can be carried out bending process, shutter arm 40 and louver board 20 are integrally formed, thus shutter rotating shaft 41 is equivalent to the rotating shaft of louver board 20 or the rotating shaft of shutter arm 40.In addition, the structure of shutter rotating shaft 41 is also unrestricted, axle portion or bearing portion can be arranged at respectively the either side of fixation side or rotary side.

In Figure 1B and Fig. 2 B, when on shutter face 21, effect has the lateral edges 23 of the opposing party's (in the figure for downside) making shutter face 21 to the blast of upper right movement, louver board 20 and shutter arm 40 with shutter rotating shaft 41 for pivot is rotated counterclockwise.So, act on the torque brachium C1 (with reference to Fig. 3 A ~ Fig. 3 C) of the torque of shutter arm 40a, torque brachium C2 (with reference to Fig. 4 A ~ Fig. 4 C), act on the torque brachium D1 (with reference to Fig. 3 A ~ Fig. 3 C) of the torque of shutter arm 40b, torque brachium D2 (with reference to Fig. 4 A ~ Fig. 3 C) change, therefore as the difference of these two torques, produce " opening and closing assist torque " (this is described in detail separately).

Fig. 3 A ~ Fig. 4 C is its length of the shutter switching mechanism related to for illustration of embodiments of the present invention 1 and the long change of torque arm and the side view schematically shown, when Fig. 3 A is shutter full cut-off when corresponding to wall, Fig. 3 B is when being 30 ° corresponding to shutter open angle when wall, Fig. 3 C is when being 60 ° corresponding to shutter open angle when wall, Fig. 4 A is when corresponding to shutter full cut-off when ceiling is installed, Fig. 4 B is when being 30 ° corresponding to shutter open angle when ceiling installation, Fig. 4 C is when being 60 ° corresponding to shutter open angle when ceiling installation.

In Fig. 3 A ~ Fig. 3 C, when spring 50 is engaging in spring mountings 45a1, by connect shutter rotating shaft 41a to be set to the line segment of spring mountings 45a1 rotate line segment 46a1, the radius of turn as the length rotating line segment 46a1 is set to " A1 ", the line segment being connected shutter rotating shaft 41b and spring mountings 45b is set to rotate line segment 46b, using when being set to " B " as the radius of turn of the length rotating line segment 46b, the relation of described radius of turn existence " A1 > B ".

In addition, using being set to " α 1 " as spring 50 (loading direction of spring 50) and the load angle rotating line segment 46a1 angulation, by when being set to " β 1 " as spring 50 (loading direction of spring 50) with the load angle rotating line segment 46b angulation, spring mountings 45a1,45b are configured to, along with opening (shutter open angle " θ " increase) of louver board 20, load angle α 1 increases towards right angle, and β 1 is towards 0 ° of minimizing.

Thus, spring 50 is respectively with " spring load Q1 " stretching shutter arm 40a, 40b.

So, on shutter arm 40a, effect has " the torque Ta1 " in the direction of opening louver board 20a, should " torque Ta1 " torque brachium C1 long-pending " Q1C1=Q1A1sin α 1 " of being " spring load Q1 " and being calculated by " A1sin α 1 ".On the other hand, shutter arm 40b produces " the torque Tb1 " in the direction closing louver board 20b, should " torque Tb1 " torque brachium D1 long-pending " Q1D1=Q1Bsin β 1 " of being " spring load Q1 " and being calculated by " Bsin β 1 ".Now, shutter arm 40a is connected by web 30 with shutter arm 40b, produces the difference (Ta1-Tb1) of two torques thus on shutter switching mechanism 100, namely produces opening and closing assist torque.

When louver board 20 is subject to blast and rotates to opening direction, spring mountings 45a1 and spring mountings 45b is in rotary moving respectively, due to the torque brachium C1 of shutter arm 40a elongated (C1 > D1), the torque Ta1 to the direction effect of opening louver board 20a that louver board 20a produces increases, on the other hand, the torque brachium D1 in shutter arm 40b shortens.Therefore, the torque Tb1 to the direction effect of closing louver board 20b that louver board 20b produces reduces, thus in shutter switching mechanism 100, louver board 20 is opened larger, and opening and closing assist torque ((Ta1-Tb1) > 0) more increases.

In Fig. 4 A ~ Fig. 4 C, when by spring 50 engaging in spring mountings 45a2, by connect shutter rotating shaft 41a to be set to the line segment of spring mountings 45a2 rotate line segment 46a2, the radius of turn as the length rotating line segment 46a2 is set to " A2 ", the line segment being connected shutter rotating shaft 41b and spring mountings 45b is set to rotate line segment 46b, using when being set to " B " as the radius of turn of the length rotating line segment 46b, the relation of described radius of turn existence " A2 > B ".

In addition, load angle as spring 50 (loading direction of spring 50) and rotation line segment 46a2 angulation is being set to " α 2 ", by when being set to " β 2 " as spring 50 (loading direction of spring 50) in the same manner as rotating the load angle of line segment 46b angulation, spring mountings 45a2,45b are configured to, along with opening (shutter open angle " θ " increase) of louver board 20, load angle α 2 near 90 ° to 180 ° of increases, β 2 is towards 0 ° of minimizing.

Thus, spring 50 is respectively with " spring load Q2 " stretching shutter arm 40a, 40b.

So, when spring 50 is engaging in 45a1, on shutter arm 40a, effect has " the torque Ta2 " in the direction of opening louver board 20a, should " torque Ta2 " torque brachium C2 long-pending " Q2C2=Q2A2sin α 2 " of being " spring load Q2 " and being calculated by " A2sin α 2 ".

On the other hand, shutter arm 40b produces " the torque Tb2 " in the direction closing louver board 20b, should " torque Tb2 " torque brachium D2 long-pending " Q2D2=Q2Bsin β 2 " of being " spring load Q2 " and being calculated by " Bsin β 2 ".Now, shutter arm 40a is connected by web 30 with shutter arm 40b, produces the difference (Ta2-Tb2) of two torques thus on shutter switching mechanism 100, namely produces opening and closing assist torque.

When louver board 20 is subject to blast and rotates to opening direction, spring mountings 45a2 and spring mountings 45b is in rotary moving respectively, because the torque brachium C2 of shutter arm 40a shortens, the torque Ta2 to the direction effect of opening louver board 20a that louver board 20a produces reduces.

On the other hand, the torque brachium D2 on shutter arm 40b shortens.Therefore, the torque Tb2 to the direction effect of closing louver board 20b louver board 20b produced reduces.Due to now " A2 > B ", in shutter switching mechanism 100, louver board 20 is opened larger, and opening and closing assist torque ((Ta2-Tb2) > 0) more slowly reduces.

In Fig. 6 A and Fig. 6 B, utilize and represent the torque (in figure shown in dotted line) produced by the deadweight of louver board 20 and the torque (in figure shown in fine line) produced by the blast from fan 215 (with reference to Fig. 7) with the correlation curve figure of shutter open angle θ, if confirm that shutter open angle θ changes due to the applying of assist torque, then the profile of equilibrium figure intersection point of the torque of closing direction and the torque of opening direction is exactly the angle that shutter stops.

In fig. 6, when wall, the torque characteristics (dotted line) of the closing direction produced due to the deadweight of louver board 20 is the function " mgLsin (ψ+θ) " of shutter open angle θ as mentioned above, therefore at " ψ > 0 ° " and in the scope of " 0 ° < (ψ+θ) < 90 ° ", " θ=0 ° " is for minimum, θ is larger, and described torque characteristics more increases.

Therefore, with in the same manner as increase along with θ and the assist torque (Ta1-Tb1) increased is offset time, the torque (in figure shown in heavy line) of the closing direction after auxiliary characteristic be though that the shutter open angle θ of louver board 20 becomes and also increases hardly greatly, thus the shutter open angle θ of torque balance becomes greatly.

In fig. 6b, when ceiling is installed, the torque characteristics (in figure shown in dotted line) of the closing direction produced due to louvered deadweight is the function " mgLcos (ψ+θ) " of shutter open angle θ, therefore at " ψ > 0 ° " and in the scope of " 0 ° < (ψ+θ) < 90 ° ", " θ=0 ° " is for maximum, θ is larger, and described torque characteristics more reduces.

On the other hand, the characteristic of assist torque (Ta2-Tb2) is for maximum and slowly reduce near " θ=0 ° ", the characteristic of the torque (in figure shown in heavy line) of the closing direction after therefore assisting is, the state exceeding the torque of the opening direction produced by blast is improved and reduces with the inclination that the minimizing of the torque than the opening direction produced by blast relaxes, thus in the torque balance of louver board 20 angle opened significantly and the opening direction produced by blast.

So, shutter switching mechanism 100, by changing the catch positions of the spring of switching mechanism, is installed both sides for the wall and ceiling needing different assist torque, all can be obtained the effect of the opening and closing of auxiliary louver board 20.

[embodiment 2]

Fig. 7 A, Fig. 7 B illustrate the ventilation fan that relates to of embodiments of the present invention 2, and Fig. 7 A is for the situation of used in air exchange fan in wall, and the situation that Fig. 7 B installs in ceiling for used in air exchange fan is by the stereogram that schematically shows of each isolation of components ground.In addition, identical label is marked with to the part identical with embodiment 1 or suitable part, clipped explanation.

In Fig. 7 A, Fig. 7 B, ventilation fan 200 is arranged in the through hole (not shown) of wall or the ceiling being formed at building, has: the shutter switching mechanism 100 illustrated in embodiment 1; Stride across the sidewall 11,13 of the framework 10 of shutter switching mechanism 100 and fixing motor built-in beam 211; Be fixed on the motor 212 of motor built-in beam 211; The fan 215 on the motor rotation axis 213 of motor 212 is detachably fixed on by circulator (fixed cell) 214; And can be arranged on freely loading and unloading in framework 10, to surround fan 215 and form the aperture 216 that can load and unload of wind-tunnel (forming the wind path guided towards louver board 20 by the wind from fan 215).

And, be connected with motor 212 via distributing cabinet 222 for the power line 221 of powering to motor 212.

Therefore, when user is energized to power line 221 by not shown switch on wall etc. and motor 212 is started (ON), louver board 20 is subject to the blast produced by the wind from fan 215.Now, on louver board 20 effect have illustrate in embodiment 1 to the opening and closing assist torque of direction effect opening louver board 20, thus louver board 20 can be smooth and easy and open effectively under the effect of blast and opening and closing assist torque.

And, when motor 212 is stopped (OFF) by switch on wall etc. by user again, the blast acting on shutter face 21 disappears, and therefore cannot support the weight of louver board 20 by means of only opening and closing assist torque, louver board 20 rotates to closing direction.In addition, diminish in shutter aperture, after torque brachium becomes " C < D ", on louver board 20, effect has the opening and closing assist torque of closing direction, therefore, under the state that shutter is closed, even if the wind of blowing over from outdoor and indoor and outdoor produce draught head, louver board 20 also can keep closed condition effectively.

Now, because ventilation fan 200 has shutter switching mechanism 100, as implied above, by means of only the installation site of changing spring 50, and do not need for this reason special parts just can replace to wall or ceiling installation.

Symbol description

10: framework; 11: sidewall; 12: sidewall; 13: sidewall; 14 sidewalls; 20a: louver board; 20b: louver board; 20c: louver board; 21a: shutter face; 21b: shutter face; 21c: shutter face; The lateral edges of 22a: one side; The lateral edges of 22b: one side; The lateral edges of 22c: one side; 23a: the lateral edges of the opposing party; 23b: the lateral edges of the opposing party; 23c: the lateral edges of the opposing party; 30: web; 40a: shutter arm; 40b: shutter arm; 40c: shutter arm; 41a: shutter rotating shaft; 41b: shutter rotating shaft; 41c: shutter rotating shaft; 43a: link rotating shaft; 43b: link rotating shaft; 43c: link rotating shaft; 45a1: spring mountings; 45a2: spring mountings; 45b: spring mountings; 46a1 rotates line segment; 46a2 rotates line segment; 46b: rotate line segment; 50: spring; 100 shutter switching mechanisms; 200: ventilation fan; 211: motor built-in beam; 212: motor; 213: motor rotation axis; 214 circulators; 215: fan; 216: aperture; 221: power line; 222: distributing cabinet.

Claims

1. a shutter switching mechanism, is characterized in that, has:

Rectangular-shaped framework;

Plural louver board, the position by the lateral edges of a side can rotate freely the earth's axis and be supported on described framework;

Web, the mode of simultaneously carrying out on-off action with this louver board links this louver board each other;

Spring, installs in the mode connected by a pair louver board in described louver board; And

Spring mountings, the louver board of at least one party in described a pair louver board is provided with two or more, can install a square end portion of described spring,

Select any one spring mountings in described plural spring mountings, a square end portion of described spring is installed on this selected spring mountings, thus change the characteristic to the torque that described louvered opening and closing is assisted.

2. shutter switching mechanism according to claim 1, is characterized in that,

The louver board of the side in described a pair louver board has the first spring mountings and these two spring mountings of the second spring mountings, and the louver board of the opposing party in described a pair louver board has a spring mountings i.e. the 3rd spring mountings,

Louvered from the described distance of position to described 3rd spring mountings supported by axle all than described the opposing party of distance from described position of being supported by axle to described first spring fitting of one louvered and the distance from described position of being supported by axle to described second spring fitting

When the louver board of one rotates, connect described first spring attachment positions and the described imaginary line of position that supported by axle and the loading direction angulation of described spring to increase in the scope of 0 ° ~ 90 °, connect described second spring attachment positions and the described imaginary line of position that supported by axle and the loading direction angulation of described spring to increase in the scope of 90 ° ~ 180 °

When the louver board of described the opposing party rotates, connect described 3rd spring attachment positions and the described imaginary line of position that supported by axle and the loading direction angulation of described spring and reduce in the scope of 0 ° ~ 90 °.

3. a ventilation fan, is characterized in that, has:

Shutter switching mechanism according to claim 1 or claim 2;

Motor, is arranged at described framework;

Fan, can be arranged at the rotating shaft of this motor with freely loading and unloading; And

Aperture, can be arranged at described framework with freely loading and unloading, and is guided by louver board plural described in the wind direction from described fan.