CN105008811A

CN105008811A - Ventilation fan and shutter opening/closing mechanism

Info

Publication number: CN105008811A
Application number: CN201380073316.7A
Authority: CN
Inventors: 安田雄一
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2013-02-26
Filing date: 2013-02-26
Publication date: 2015-10-28
Anticipated expiration: 2033-02-26
Also published as: JP5901836B2; JPWO2014132330A1; WO2014132330A1; CN105008811B; HK1211686A1

Abstract

A shutter opening/closing mechanism (100) has: a rectangular frame body (10); shutter plates (20a, 20b, 20c) which are mounted on shutter pivot shafts (41a, 41b, 41c) so as to be capable of pivoting relative to the frame body (10), the shutter pivot shafts (41a, 41b, 41c) being each provided close to one side edge (22a, 22b, 22c) of each of shutter faces (21a, 21b, 21c); shutter arms (40a, 40b, 40c) which are each provided close to the one side edge (22a, 22b, 22c) and which are tilted relative to the shutter plates (20a, 20b, 20c); a connection plate (30) which connects the shutter arms (40a, 40b, 40c) to each other; and a spring (50) which is attached straddling both the shutter arm (40a) and the shutter arm (40b).

Description

Ventilation fan and shutter switching mechanism

Technical field

The present invention relates to ventilation fan and shutter switching mechanism, particularly relate to the shutter switching mechanism of ventilation fan and the hinge gate-type shutter possessing hinge gate-type shutter.

Background technology

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

That is, ventilation fan is assemblied in and is formed in the through hole of wall, possesses: framework (frame), and this framework has and ventilation fan entirety support and to be fixed on the function of wall, and opening is distinguished in its indoor and outside; Motor, this motor is supported in framework; Fan, this fan is fixed on the rotating shaft of motor removably by nose shell (fixed mechanism); And hole parts, these hole parts are dismantled and assembled, are fixed on framework, and form wind-tunnel with surrounding fan.

Further, by utilizing power switch etc. to control, via the power supply of power line supply, to make fan (motor) rotary actuation, form air-flow between the air and the air of outside of indoor, take a breath to indoor.

In addition, framework possesses shutter, this used in blinds in when not taking a breath by indoor and outdoor partition.Such as, when forming air-flow being started by fan (motor) by fan, the shutter of wind pressure type is opened (indoor are communicated with outdoor) owing to pushing the pressure of shutter, and fan (motor) is being stopped, when not forming the air-flow of fan, the distress resolves of pushing shutter, shutter is closed (indoor and outdoor partition).

Shutter has the multiple louver boards configured in parallel to each other, position near multiple louvered top edge is rotatably arranged at framework respectively on parallel shutter axle, and the scope near louvered lower limb is rotated in the mode outstanding to outside.

Further, the position near multiple louvered top edge is provided with the connection shaft parallel with shutter axle, and by the web rotatably kept by this web, multiple louver board is interconnected.

In addition, an end of spring (spring) is arranged at web, and another end is arranged at framework.That is, be configured to following mechanism: web is by spring (spring) from top force, and thus, multiple louver board is subject to the moment of torsion along the direction of opening, and the amplitude opened with shutter becomes large, the mode that the capacity of ventilation fan increases is assisted.And, although be configured to the structure that larger, the auxiliary moment of torsion of the amplitude that shutter opens more increases, but shutter is opened, spring reduces, then spring-load more reduces, the increase of auxiliary moment of torsion is milder, therefore, disclose following mechanism: use torsion-coil spring, make auxiliary torque become large relative to the increment rate of the amount of movement of web, obtain for optimal torque characteristics (for example, referring to patent document 1) auxiliary shutter is opened.

Prior art document

Patent document

Patent document 1: the real microfilm (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

But the spring of louvered switching mechanism that patent document 1 is recorded is configured in the front of web, therefore, there is switching mechanism and becomes large-scale, the problem that the depth size of ventilation fan is restricted.

The object of the invention is to solve the problem, provide a kind of and there is effect and small-sized shutter switching mechanism that the increment rate of opening and closing auxiliary torque is increased and the ventilation fan with this shutter switching mechanism.

For solving the means of problem

The feature of shutter switching mechanism of the present invention is to have: the framework of rectangular shape; Multiple louver board, the position near an one lateral margin is rotatably arranged at above-mentioned framework; Shutter arm, it is fixed near a plurality of louvered lateral margin, and tilts relative to above-mentioned multiple louver board respectively; Web, it is by interconnected for the plurality of shutter arm; Spring, it installs with striding across a pair shutter arm in above-mentioned multiple shutter arm.

The effect of invention

Shutter switching mechanism of the present invention, owing to being said structure, so can becoming small-sized, and by suppressing the decline of spring-load, making the increment rate of opening and closing auxiliary torque become large, thus can obtain suitable auxiliary torque characteristic.

Namely, the spring of shutter switching mechanism of the present invention is installed with striding across a pair shutter arm (carrying out identical movement), therefore the space that the spring as shown in Figure 1 as patent document 1 configures is not needed, correspondingly, can shutter switching mechanism be formed thin (little), in addition, from patent document 1 as shown in Figure 3, structure that spring is installed with striding across web and framework (not moving) is different, the deflection of spring diminishes.

Accompanying drawing explanation

Fig. 1 is the stereogram of the entirety of the shutter switching mechanism representing embodiments of the present invention 1.

Side view when Fig. 2 is the shutter closedown representing the shutter switching mechanism shown in Fig. 1.

Fig. 3 is side view when representing that the shutter of the shutter switching mechanism shown in Fig. 1 is opened.

Fig. 4 A is the side view (when shutter is closed (θ=0 °)) for illustration of the torque arm length C of the shutter shown in Fig. 1, the variation of D.

Fig. 4 B is side view when centre position (shutter open to (θ=30 °)) for illustration of the torque arm length C of the shutter shown in Fig. 1, the variation of D.

Fig. 4 C is the side view (when shutter is significantly opened (θ=60 °)) for illustration of the torque arm length C of the shutter shown in Fig. 1, the variation of D.

Fig. 5 A is the side view (when shutter is closed (θ=0 °)) of relation of open angle θ for explaining the shutter shown in Fig. 1 and torque arm length C, D.

Fig. 5 B is the side view (when shutter is opened (θ > 0 °)) of relation of open angle θ for explaining the shutter shown in Fig. 1 and torque arm length C, D.

Fig. 6 A be the open angle θ of the shutter shown in key diagram 5B and torque arm length C, D relation (when shutter is opened (θ > 0 °), the enlarged side view of the part of a shutter arm.

Fig. 6 B be the open angle θ of the shutter shown in key diagram 5B and torque arm length C, D relation (when shutter is opened (θ > 0 °), the enlarged side view of the part of another shutter arm.

Fig. 7 A illustrates schematic diagram that the deflection of spring suppresses situation, that represent the action of the spring of bindiny mechanism of the present invention and the formula about the parameter in this schematic diagram.

Fig. 7 B illustrates schematic diagram that the deflection of spring suppresses situation, that represent the action of the spring for the bindiny mechanism compared and the formula about the parameter in this schematic diagram.

Fig. 8 be in order to illustrate bindiny mechanism for comparing, the schematic diagram of torque arm length of shutter and the formula about the parameter in this schematic diagram.

Fig. 9 is that the moment of torsion of auxiliary torque of the present invention, the auxiliary torque being used for the bindiny mechanism compared, shutter being closed due to deadweight represents and the chart compared relatively with shutter open angle θ.

Figure 10 is the stereogram each isolation of components of the ventilation fan of embodiments of the present invention 2 represented.

Detailed description of the invention

[embodiment 1]

To be the figure of the shutter switching mechanism that embodiments of the present invention 1 are described, Fig. 1 be Fig. 1 ~ Fig. 3 represents overall stereogram, and Fig. 2 is side view when representing that shutter is closed, and Fig. 3 is side view when representing that shutter is opened.In addition, each figure has an X-rayed a part (sidewall of framework) for parts and schematically represents, therefore the present invention is not limited to illustrated form.

In Fig. 1 ~ Fig. 3, shutter switching mechanism 100 has: framework 10, and this framework 10 is rectangular shapes, is surrounded form by sidewall 11,12,13,14; Louver board 20a, 20b, 20c, this louver board 20a, 20b, 20c be rotatably arranged at relative sidewall in sidewall 11 12,14 (the below of louver board 20a and above, configure louver board 20b and louver board 20c respectively).

Louver board 20a, 20b, 20c have shutter face 21a, 21b, 21c of rectangular shape, and framework 10 is rotatably arranged on shutter turning cylinder 41a, 41b, 41c, described shutter turning cylinder 41a, 41b, 41c are arranged on the position near (upside in Fig. 1) lateral margin 22a, 22b, 22c of shutter face 21a, 21b, 21c.

In addition, position near lateral margin 22a, 22b, a 22c, be fixed with (not parallel with shutter face 21a etc. or not on the same face) shutter arm 40a, 40b, the 40c tilted relative to shutter face 21a, 21b, 21c, shutter arm 40a, 40b, 40c are on link turning cylinder 43a, 43b, 43c of being arranged at shutter arm 40a, 40b, 40c, interconnected by web 30.

In addition, shutter arm 40a, 40b are respectively arranged with spring mountings 45a, 45b, spring 50 is installed with striding across spring mountings 45a and spring mountings 45b.That is, an end of spring 50 is locked to spring mountings 45a, and another end is locked to spring mountings 45b.

Now, spring 50 is mounted with the state of extending or compress, and therefore, on shutter arm 40a and shutter arm 40b (on louver board 20a and louver board 20b), effect has the moment of torsion making them rotate in opposite direction.

Here, spring 50 is installed with striding across shutter arm 40a and shutter arm 40b, but the present invention does not limit therewith, also can replace shutter arm 40b ground, shutter arm 40c arranges spring mountings 45c, strides across shutter arm 40c and shutter arm 40a ground mounting spring 50.

In addition, the present invention is not limited to three pieces of louver boards 20a, 20b, 20c, as long as louver board is multiple, can be any block.

In addition, below, when the common content of all parts (position) is described, the record investing the suffix " a, b, c " of the Reference numeral of parts (position) is omitted.

Further, owing to also by a part of bending machining of louver board 20, shutter arm 40 and louver board 20 can be formed, so shutter turning cylinder 41 is equivalent to the turning cylinder of louver board 20 or the turning cylinder of shutter arm 40.In addition, the structure of shutter turning cylinder 41 does not limit therewith, axle portion or bearing portion can be arranged at respectively any one party of fixation side or rotating side yet.

In figure 3, when making another (downside in Fig. 2) lateral margin 23 in shutter face 21 to the Action of Wind pressure of upper right movement in shutter face 21, louver board 20 and shutter arm 40 rotate for pivot in the counterclockwise direction with shutter turning cylinder 41.

Like this, along with above-mentioned rotation, torque arm length D (with reference to Fig. 3) change of the torque arm length C (with reference to Fig. 4) acting on the moment of torsion of shutter arm 40a and the moment of torsion acting on shutter arm 40b, therefore, as the difference of these two moments of torsion, produce " opening and closing auxiliary torque " (about this, explaining in addition).

Fig. 4 is the side view schematically represented in order to the variation of torque arm length C, D in key diagram 3, when Fig. 4 A represents that shutter is closed (θ=0 °), when Fig. 4 B represents that shutter opens to centre position (θ=30 °), when Fig. 4 C represents that shutter is significantly opened (θ=60 °).

In the diagram, to the line segment of shutter turning cylinder 41a and spring mountings 45a linked as rotation line segment 46a, to the length of line segment 46a and radius of turn be rotated as " A ", to the line segment of shutter turning cylinder 41b and spring mountings 6b be linked as rotation line segment 46b, using when rotating the length of line segment 46b and radius of turn as " B ", about above-mentioned radius of turn, there is the relation of " A > B ".

In addition, using spring 50 (load direction of spring 50) with rotate line segment 46a angulation and load perspective as " α ", using spring 50 (load direction of spring 50) with when rotating line segment 46b angulation and load perspective as " β ", to open along with louver board 20 (open angle " θ " increase), load perspective α increases towards right angle, on the other hand, the mode that load perspective β reduces towards 0 °, configuration spring mountings 45a, 45b.

Thus, spring 50 pulls shutter arm 40a, 40b respectively with " spring-load Q ".

Like this, on shutter arm 40a, effect has " torque T a " along the direction of being opened by louver board 20a, this " torque T a " is long-pending " the QC=QAsin α " of the torque arm length C that " spring-load Q " calculates with use " Asin α ", on the other hand, on shutter arm 40b, produce " the torque T b " along the direction closed by louver board 20b, this " torque T b " is long-pending " the QD=QBsin β " of the torque arm length D that " spring-load Q " calculates with use " Bsin β ", because shutter arm 40a is connected by web 30 with shutter arm 40b, therefore, as the difference (Ta-Tb) of two moments of torsion, shutter switching mechanism 100 produces opening and closing auxiliary torque.

Then, when louver board 20 is subject to blast and rotates along the direction of opening (with reference to Fig. 4 B and Fig. 4 C), spring mountings 45a and spring mountings 45b is in rotary moving respectively, the torque arm length C of shutter arm 40a is elongated (C > D), thus, the torque T a along the direction effect of being opened by louver board 20a that louver board 20a produces increases, on the other hand, because the torque arm length D of shutter arm 40b shortens, the torque T b along the direction effect of being closed by louver board 20b that louver board 20b produces reduces.Therefore, in shutter switching mechanism 100, the amplitude that louver board 20 is opened is larger, and opening and closing auxiliary torque ((Ta-Tb) > 0) more increases.

In addition, when louver board 20 rotates, spring mountings 45a, 45b are in rotary moving along equidirectional, therefore, compared with one end of spring 50 being installed on the situation of framework 10, the deflection of spring 50 diminishes, thus, suppress the decline of spring-load, the increment rate of the moment of torsion (opening and closing auxiliary torque) of generation can be made to become large.

In addition, in the state (state that open angle θ is little that shutter is closed, with reference to Fig. 4 A) under, due to torque arm length C shorter than torque arm length D (C < D), therefore, the torque T a along the direction effect that louver board 20a is opened louver board 20a the produced torque T b little (Ta < Tb) along direction effect that louver board 20b is closed that produce upper than louver board 20b.Therefore, shutter switching mechanism 100 produces the opening and closing auxiliary torque in the direction closed along shutter, plays function in the mode of louver board 20 being closed (being not easy to open).

As mentioned above, in shutter switching mechanism 100, according to the value of radius of turn A, B and load perspective α, β, there is the situation of " C < D " and " C > D " in torque arm, by suitably selecting these values, thus opening and closing auxiliary torque can be adjusted according to destination.That is, by random giving radius of turn and the load perspective of spring set-point, the correlation properties between shutter open angle and opening and closing auxiliary torque can be adjusted.

In addition, be explained above the situation that spring 50 is extension spring (producing spring-load by extending), but the present invention being not limited to extension spring, also can be Compress Spring (producing spring-load by compression).

In addition, when shutter switching mechanism 100 being applied to the wind pressure type shutter that wall is installed, louver board 20 has following feature usually: the amplitude opened by louver board 20 is larger, " be subject to blast and produce the torque T o along the direction effect of opening " more declines, on the other hand, the amplitude that louver board 20 is opened is larger, and " the torque T s along the direction effect of closing produced by the weight of louver board 20 " more increases.Therefore, in the scope (till opening to a certain degree) that the open angle θ of louver board 20 is little, have " To > Ts ", assisting therefore even without shutter switching mechanism 100, louver board 20 also can be opened.

Therefore, in the scope that the open angle θ of louver board 20 is little, even if torque arm exists the relation of " C < D ", the auxiliary torque along the direction closed that shutter switching mechanism produces is also little than " To-Ts ", there is not the problem in action.

And, the situation needing torque arm to become the relation of " C > D " is that open angle θ becomes situation that is large, that become " To < Ts ", now, following effect can be obtained: the distortion suppressing spring 50, produce the opening and closing auxiliary torque needed.

Fig. 5 and Fig. 6 is the figure of relation of open angle θ for explaining louver board 20 and torque arm length C, D, Fig. 5 A be shutter close time (θ=0 °) side view, Fig. 5 B is shutter side view of (θ > 0 °) when opening, Fig. 6 A is the enlarged side view of shutter part of a shutter arm of (θ > 0 °) when opening, and Fig. 6 B is the enlarged side view of shutter part of another shutter arm of (θ > 0 °) when opening.

In Figure 5, when linking the straight line of shutter turning cylinder 41a with shutter turning cylinder 41b (identical with the straight line of shutter turning cylinder 41b with link shutter turning cylinder 41c) as datum line 15, using datum line 15 with rotate line segment 46a angulation as " α ＇ ", using datum line 15 with rotate line segment 46b angulation as " β ＇ ", during using the distance of shutter turning cylinder 41a and shutter turning cylinder 41b as " E ", utilize the relation with the open angle θ of louver board 20 (being equivalent to datum line 15 and shutter face 21 angulation), torque arm length C, the length S of D and spring 50 can represent by following formula.

In addition, using spring mountings 45a and spring mountings 45b, with the distance on the vertical direction of datum line 15 as " x ", using spring mountings 45a with the distance on spring mountings 45b, parallel with datum line 15 direction as " y ".

[formula 1]

C＝Asin(α′+θ-γ)

D＝Bsin{180-(β′+θ)+γ}

γ = \tan^{- 1} \frac{x}{y}

S = \sqrt{x^{2} + y^{2}}

x＝Asin(α′+θ)-Bsin(β′+θ)

y＝Acos(α′+θ)-Bcos(β′+θ)+E

α′+θ-γ＝α

180-(β′+θ)+γ＝β

Namely, by utilizing above-mentioned formula, shutter switching mechanism 100 can determine following structure (angle between the length of each several part and each several part): this structure is used for guaranteeing to make torque arm become the scope (becoming the higher limit of the open angle θ of the relation of " C < D ") of the open angle θ of the relation of " C > D ".

Therefore, it is possible to while small-sized (slim), select and there is desired closing characteristic.

(effect that spring deflection suppresses)

Fig. 7 A and Fig. 7 B illustrates that the deflection of spring suppresses the figure of situation, Fig. 7 A is the schematic diagram of the action of the spring represented in bindiny mechanism of the present invention and the formula about the parameter in this schematic diagram, and Fig. 7 B represents the schematic diagram of the action of the spring in the bindiny mechanism shown in Fig. 3 of the patent document 1 for comparing and the formula about the parameter in this schematic diagram.

In fig. 7, as mentioned above, the length " S " of the spring 50 when shutter switching mechanism 100 carries out action (rotation) is represented by formula 1a ~ formula 2c.

In addition, its length (S) after distortion is relative to its length (S during shutter full cut-off ₀(following, about the symbol of the function as shutter open angle θ, to add suffix 0 after the symbol when representing shutter full cut-off and represent)) ratio (S/S ₀) be formula 3a, therefore, it is possible to above-mentioned formula is substituted into and is write as the such form of formula 3b.In addition, in Pythagorean theorem, the denominator in the square root on the right of formula 3b and molecule are all positive numbers.Launch in the square root of this formula, and arrange by the addition theorem of trigonometric function, then can be write as the such form of formula 3c.

[table 1]

In addition, in figure 7b, its length (R) after distortion is relative to its length (R during shutter full cut-off ₀) ratio (R/R ₀) according to said process, can be write as the form that formula 4a ~ formula 4c is such.

Here, if the ratio (S/S of its length after the distortion in syndeton of the present invention ₀) than the ratio (R/R for its length after the distortion in the syndeton that compares ₀) large, be connected with inequality, then become formula 5a, therefore, it is possible to write as the such form of formula 5b according to said process.

Further, in order to simplify formula, the size at each position being arranged, substituting into " F=A ", " ε=α ＇ ", " G=E-Bcos β ＇ " and " H=Bsin β ＇ " arrange on the right, obtaining formula 5c.Now, each parameter in formula 5c is formula 6a ~ formula 6g.

Further, the both sides of formula 5c square are arranged common item, obtains formula 7, formula 6 to be brought back in each parameter in formula 7 and to calculate, then obtaining formula 8.

That is, if formula 8 is set up, then the effect that spring deflection suppresses can be obtained.

(making the effect that the increment rate of opening and closing auxiliary torque becomes large)

By the increment rate of opening and closing auxiliary torque now, utilize spring constant ks, the spring natural length S of the structure of invention _f, and spring constant kr, the spring natural length R of syndeton for comparing _f, the torque arm length J shown in Fig. 8 compares, then become following formula 9a.But according to the purposes of embodiment 1, the increment rate of opening and closing auxiliary torque is positive number, in addition, has " S _f< S < S ₀, R _f< R < R ₀".

Further, arrange size and the spring performance at each position of two structures, make " S ₀=R ₀, D ₀=J ₀, ks=kr, S _f=R _f", then arrange formula 9a, obtain formula 9b.

Therefore, if formula 9a or formula 9b sets up, then the increment rate that can obtain opening and closing auxiliary torque becomes large effect.In addition, in formula 9b, (S/S ₀) more than (R/R ₀) large, (left side-the right) is larger, therefore known, and by suppressing spring deflection, the increment rate of opening and closing auxiliary torque becomes large.

[table 2]

On the other hand, the increment rate of opening and closing auxiliary torque, also according to torque arm length C, D, J change, therefore, needs to consider that this point is to determine each size and angle.The condition that formula 9b easily sets up is (C-D) and D ₀value large, the calculating formula according to formula 1 and Fig. 8 can infer that C and J is more close value, and therefore, as long as obtain, D diminishes, D ₀become large condition.

Consider that D diminishes, D ₀become large condition, according to formula 1, due to D=Bsin{180-(β ＇+θ)+γ }=Bsin (β ＇+θ-γ), D ₀=Bsin (β ＇-γ ₀), as long as therefore angle (β ＇+θ-γ) is close with 0 °, angle (β ＇-γ ₀) close with 90 °.Here, angle θ, γ, γ is considered ₀scope, angle θ is shutter open angle, so be 0 ° ~ about 70 °, about angle γ and γ ₀, according to the object making the depth size of shutter switching mechanism diminish of the present invention, make the structure that size A is little relative to size E, then according to the formula of formula 1, γ is about 25 °, γ ₀it is about 0 ~ 10 °.Therefore, if make β ＇ be 100 ° ~ about 120 °, then D diminishes, D ₀become large, easily obtain the effect making the increment rate of opening and closing auxiliary torque become large.

As an example, when being " θ=60 °, α ＇=30 °, β ＇=120 ° " when making angle, formula 8 becomes " 0.5E >-0.866A ", i.e. " (A/E) >-0.577 ", due to " A > 0, E > 0 ", therefore regardless of the length of A, B, E, the effect that spring deflection suppresses can both be obtained.Here, size is made to be " A=45, B=20, E=90, S _f=50 " when, formula 9b becomes " 28.195 > 16.765 " and set up, therefore, it is possible to obtain the effect making the increment rate of opening and closing auxiliary torque become large.

Fig. 9 is the chart that the torque T s in the direction opening and closing auxiliary torque of two structures now, louver board closed due to deadweight and shutter open angle θ represent relatively.Ts is the function of the horizontal level of " the shutter center of gravity rotated centered by shutter axle ", therefore increase on sin curve, the opening and closing auxiliary torque of structure of the present invention depicts the characteristic of the curve along Ts, in whole slewing areas of shutter, all obtains the characteristic that shutter is easily opened.

In addition, in the syndeton for comparing, by making angle ε and size H close to 0, computationally also can obtain the torque characteristics close with structure of the present invention, but in fact, in order to do not make web or spring and shutter axle too close to and disturb, have to make as Fig. 3 of patent document 1 spring mountings become from shutter axle away from size, and cannot to realize.

[embodiment 2]

Figure 10 is the figure of the ventilation fan that embodiments of the present invention 2 are described, is by each isolation of components and the stereogram schematically represented.In addition, identical Reference numeral is accompanied by for the part identical with embodiment 1 or suitable part, and clipped explanation.

In Fig. 10, ventilation fan 200 is assemblied in the through hole (not shown) of the wall being formed at building, possesses: the shutter switching mechanism 100 described in embodiment 1; Motor built-in beam 211, sidewall 11,13 ground that this motor built-in beam 211 strides across the framework 10 of shutter switching mechanism 100 is fixed; Motor 212, this motor 212 is fixed on motor built-in beam 211; Fan 215, this fan 215 is fixed on the motor rotation axis 213 of motor 212 removably by nose shell (fixed mechanism) 214; Removable hole parts 216, this hole parts 216 dismounting is arranged at framework 10 freely, surrounds fan 215 ground and forms wind-tunnel (forming the wind path air-supply from fan 215 guided to louver board 20).

Further, the power line 221 for supplying electric power to motor 212 is connected with motor 212 via distributing cabinet 222.

Therefore, when user utilizes not shown switch on wall etc. to start (ON) motor 212 to power line 221 energising, louver board 20 is subject to the blast formed by the air-supply from fan 215.Now, the opening and closing auxiliary torque along the direction effect making louver board 20 open illustrated in embodiment 1 acts on louver board 20, and therefore, due to blast and opening and closing auxiliary torque, louver board 20 smoothly and reliably open.

And, when again utilizing stopping (OFF) motor 212 such as switch on wall as user, the blast acting on shutter face 21 disappears, therefore, only rely on opening and closing auxiliary torque cannot support the weight of louver board 20, louver board 20 rotates along the direction closed.In addition, diminish in shutter aperture, after torque arm length becomes " C < D ", opening and closing auxiliary torque along the direction closed acts on louver board 20, therefore, under the state that shutter is closed, even if louver board 20 is moved by the wind from outdoor, produce draught head in indoor and outdoor, louver board 20 also reliably keeps the state of closing.

As mentioned above, ventilation fan 200 can promote miniaturized shutter switching mechanism 100 by having, thus can become small-sized.

In addition, the present invention is not limited to the scheme being arranged on by ventilation fan 200 and being formed at and taking a breath to these indoor in the through hole of indoor wall surface, also can towards a Lateral supply " pressure fan ".

Description of reference numerals

10 frameworks, 11 sidewalls, 12 sidewalls, 13 sidewalls, 14 sidewalls, 15 datum lines, 20a louver board, 20b louver board, 20c louver board, 21a shutter face, 21b shutter face, 21c shutter face, 22a (upside) lateral margin, 22b (upside) lateral margin, 22c (upside) lateral margin, another (downside) lateral margin of 23a, another (downside) lateral margin of 23b, another (downside) edge of 23c, 30 webs, 40a shutter arm, 40b shutter arm, 40c shutter arm, 41a shutter turning cylinder, 41b shutter turning cylinder, 41c shutter turning cylinder, 43a links turning cylinder, 43b links turning cylinder, 43c links turning cylinder, 45a spring mountings, 45b spring mountings, 46a rotates line segment, 46b rotates line segment, 50 springs, 100 shutter switching mechanisms (embodiment 1), 200 ventilation fans (embodiment 2), 211 motor built-in beams, 212 motor, 213 motor rotation axis, 214 nose shells, 215 fans, 216 hole parts, 221 power lines, 222 distributing cabinets.

Claims

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

The framework of rectangular shape;

Multiple louver board, the position near a described multiple louvered lateral margin is rotatably arranged at described framework;

Shutter arm, described shutter arm is fixed near a described multiple louvered lateral margin, and tilts relative to described multiple louver board respectively;

Web, described web is by interconnected for described multiple shutter arm; And

Spring, described spring is installed with striding across a pair shutter arm in described multiple shutter arm.

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

Described spring is the extension spring of the state installation of extending, or with the Compress Spring that the state of compression is installed.

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

The described louver board being provided with on a shutter arm of described spring, to be provided with described spring position and spring mountings and being fixed with a described shutter arm is relative to the distance between the center of rotation of described framework and shutter axle, from on another shutter arm being provided with described spring, the position that is provided with described spring and spring mountings and the described louver board that is fixed with another shutter arm described relative to the center of rotation of described framework and the distance of shutter axle different

Link the described spring mountings of a described shutter arm and the line of described shutter axle and described spring angulation, different with described spring angulation with the line of described shutter axle from the described spring mountings linking another shutter arm described.

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

In described structure, by making the size of the moment of torsion produced on a shutter by spring convert with the size of the moment of torsion produced on another shutter in the scope of rotating at shutter, thus under the state of closing at shutter, produce the opening and closing auxiliary torque that the direction closed along shutter acts on.

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

Shutter switching mechanism according to any one of Claims 1 to 4;

Motor, described motor is arranged at described framework;

Fan, described fan dismounting is arranged at the rotating shaft of described motor freely; And

Hole parts, the parts dismounting of described hole is arranged at described framework freely, and the air-supply from described fan is guided to described multiple louver board.