JP6413089B2 - Shutter structure and air blower equipped with the same - Google Patents

Description

  The present invention relates to a shutter structure used for preventing a backflow of fluid flowing through a pipeline and a blower provided with the shutter structure.

  Conventionally, this type of shutter structure is known to be composed of a single shutter in which a cross-sectional shape on a plane perpendicular to the rotation axis is smoothly formed by a plurality of arcs (see, for example, Patent Document 1). .

  The shutter structure will be described below with reference to FIG.

  As shown in FIG. 9, the shutter structure 101 is composed of a shutter plate 106 and a rotating shaft 109 provided in the pipe 102. The shutter plate 106 can be rotated by a rotation shaft 109 and opens and closes the conduit 102 by the rotation. With the pipe line 102 open, a portion on the shutter plate 106 on the upstream side of the rotation shaft 109 on the shutter plate 106 is defined as an upstream region 117, and a portion on the downstream side is defined as a downstream region 118. In a state where the pipe line 102 is opened, the cross-sectional shape of the shutter plate 106 in an arbitrary plane passing through the pipe axis 103 is an arc or a plurality of arcs between the cross-sectional shape of the upstream region 117 and the cross-sectional shape of the downstream region 118. It has a smoothly tied shape.

  With the above configuration, fluid can be smoothly guided from the upstream region 117 to the downstream region 118 of the shutter plate 106 in a state where the pipe line 102 is opened. Then, it is possible to suppress the turbulence of the flow, and to reduce the resistance to the fluid and the noise and vibration caused by the turbulence.

  In addition, this type of shutter structure includes a structure in which a shutter composed of two plates can be folded around a rotation axis (see, for example, Patent Document 2).

  Hereinafter, the shutter structure will be described with reference to FIG.

  As shown in FIG. 10, the main body 211 includes a pipe guide 212 and a main body plate 213. A shutter 214 composed of two semicircular plates for opening and closing the air passage is provided in the pipe guide 212 so as to be rotatable about a rotation shaft 215. The main body plate 213 is provided with a drive motor 242 for opening the shutter 214. The shutter 214 and the drive motor 242 are connected by wires 232 and 243 through a pulley 240. The rotary shaft 215 is provided with a spring 219 that applies a force in a direction in which the shutter closes the air path.

  With the above configuration, the shutter 214 described above operates as follows.

  When opening the air path inside the pipe guide 212, the drive motor 242 is driven to wind up the wire 243. When the wire 243 is wound up, the pulley 240 rotates. When the pulley 240 rotates, the wire 232 connected to the shutter 214 is wound around the pulley 240. When the wire 232 is wound up, the shutter 214 is pulled and rotated around the rotation shaft 215, so that the two semicircular plates are folded around the rotation shaft.

  When the air path inside the pipe guide 212 is closed, the wire 243 is loosened by driving the drive motor 242 in the direction opposite to that when opening the air path. Since the shutter 214 always pulls the wire 232 to spread by the spring 219, when the wire 243 is loosened, the pulley 240 rotates in the reverse direction, the wire 232 is rewound, the shutter 214 is expanded, and the air path is closed.

  The shutter 214 opens an air passage when ventilation is necessary, and prevents the air passage from being opened by pressing the shutter 214 even when external air pressure is applied when the air passage is closed. In the state where the air passage is open, the shape of the shutter 214 is V-shaped with the rotary shaft 215 facing the upstream side, so that the pressure loss of the air passage can be reduced.

Japanese Patent No. 4984664 Japanese Patent No. 5059917

  In such a conventional single shutter structure, it is necessary to block the two flow paths (pipe lines) with the rotation axis as a boundary, that is, the upstream side and the downstream side of the rotation shaft 109 in FIG. 9A. For this reason, the shutter plate 106 needs an upstream region 117 protruding upstream from the rotation shaft 109. However, when the upstream region 117 is long, the center of gravity of the shutter plate 106 is shifted to the center, and thus the movement of the shutter becomes unstable with respect to the fluctuation of the fluid flow. Further, when the shutter is open, the upstream region 117 causes an increase in the projected area of the shutter plate 106 in the flow direction, which causes a problem of pressure loss.

  Further, since the conventional two-sheet shutter structure is difficult to open and close under its own weight, a complicated mechanism for opening and closing is required. Furthermore, since it is necessary to provide a complicated structure (mechanism) other than the shutter in the flow path, this has a problem that it becomes a flow resistance, that is, pressure loss increases.

  The present invention also provides a cylindrical flow path through which a fluid flows from the flow side to the downstream side, and the flow path has a cross-sectional area larger than the main flow path and the main flow path on a cross section perpendicular to the central axis of the flow path A main shaft that opens and closes the main flow path about the rotation axis; and a sub shutter that opens and closes the sub flow path about the rotation axis. When the fluid flow is present, the fluid force of the fluid turns from the closed state parallel to the cross section to the downstream side to shift to the open state perpendicular to the cross section, and there is no fluid flow Has a main opening / closing structure that shifts from the open state to the closed state by its own weight, and when the fluid flows, the sub-shutter rotates from the closed state parallel to the cross section to the downstream side to rotate the sub shutter. Transition to an open state perpendicular to the cross section, When there is no body flow, the shutter structure is provided with a sub-opening / closing structure that shifts to a closed state parallel to the cross-section by using the rotation of the main shutter due to its own weight. Is achieved.

  ADVANTAGE OF THE INVENTION According to this invention, the pressure loss of a flow path can be reduced and the shutter structure and air blower which were stable with respect to the flow can be provided.

The perspective view of the shutter structure which concerns on one embodiment of this invention, and an air blower (A) The perspective view in the closed state of the shutter structure which concerns on one embodiment of this invention (b) The upstream view sectional drawing in the closed state of the shutter structure which concerns on one embodiment of this invention (A) The perspective view in the open state of the shutter structure which concerns on one embodiment of this invention (b) The upstream view sectional drawing in the open state of the shutter structure which concerns on one embodiment of this invention (A) Top perspective view of each shutter according to an embodiment of the present invention, (b) Bottom perspective view of each shutter according to an embodiment of the present invention The elements on larger scale of the sub axial hole of the sub shutter which concerns on one embodiment of this invention The sectional side view in the open state of the shutter structure concerning one embodiment of the present invention The sectional side view in the middle of the process which transfers to the closed state from the open state of the shutter structure concerning one embodiment of the present invention The sectional side view in the closed state of the shutter structure concerning one embodiment of the present invention. (A) Side sectional view showing a conventional one-sheet shutter structure (b) Projection view onto a plane perpendicular to the pipe axis showing a conventional one-sheet shutter structure (A) Closed state sectional view showing a conventional two shutter structure (b) Open state sectional view showing a conventional two shutter structure

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention. Throughout the drawings, the same portions are denoted by the same reference numerals and description thereof is omitted. Further, in each of the drawings, description of details of each part not directly related to the present invention is omitted.

(First embodiment)
Hereinafter, the outline of the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing a shutter structure and a blower according to the present embodiment.

  The blower 8 includes a casing 9 provided with a suction port 13 and a blower outlet 14 inside the outer shell 16, and a blower 12 inside the casing 9.

  The suction inlet 13 is arrange | positioned toward indoors, such as a living room, for example.

  The blower outlet 14 is connected to the shutter structure 1 described later.

  The air blowing unit 12 includes a motor 10 and a fan 11.

  The motor 10 is connected to the fan 11 via a rotation shaft provided in the motor 10, and transmits the rotational power of the motor 10 to the fan 11.

  The fan 11 is a sirocco fan that can maintain a high static pressure, for example, and discharges air sucked from the suction port 13 of the cylindrical end surface (downward in the drawing) from the cylindrical side surface by rotation.

  The casing 9 is provided on the outer periphery of the fan 11 and guides the air discharged from the fan 11 to the air outlet 14 using the inner wall thereof.

  The shutter structure 1, that is, the shutter includes a flow path 2, a rotation shaft 3, a main shutter 4, and a sub shutter 5.

  The flow path 2 has a hollow cylindrical shape and can flow a fluid into the hollow portion. The flow path 2 includes an upstream suction port 6 on the upstream side in the fluid flow 15 and a downstream air outlet 7 on the downstream side. Further, in the flow path 2, the upstream suction port 6 is detachably connected to the blower outlet 14 of the blower 8, that is, the upstream suction port 6 serves as an inlet for the fluid flow 15. Moreover, the flow path 2 is connected to the outdoors via a duct, for example, at the downstream air outlet 7.

  Details of the rotating shaft 3, the main shutter 4, and the sub shutter 5 provided inside the cylinder of the flow path 2 will be described later.

  When the blower 8 is driven, electric power is supplied to the motor 10, and the motor 10 rotates the fan 11 by rotating the rotation shaft. When the fan 11 rotates, air (fluid) is sucked into the casing 9 from the suction port 13, and a fluid flow 15 that is guided to the outlet 14 based on the structure in the casing 9 is generated.

  The fluid flow 15 is led into the flow path 2 from the upstream suction port 6 of the shutter structure 1 and then discharged from the downstream air outlet 7.

  Next, details of the open state of the shutter structure will be described with reference to FIG. 2A is a perspective view of the shutter structure in the closed state, and FIG. 2B is a cross-sectional view of the shutter structure in the closed state. For the sake of understanding, the cylindrical flow path 2 is shown in cross section in FIG.

  The shutter structure 1 is closed when there is no fluid flow 15 from the upstream side, that is, the arrow 20 side. The shutter structure 1 is in an open state when there is a fluid flow 15 from the upstream side. In FIG. 2, a case where there is no fluid flow, that is, a closed state will be described.

  The flow path 2 includes a central axis 21 parallel to the flow direction. The flow path 2 includes a rotation shaft 3 that is perpendicular to the central axis 21. However, the rotating shaft 3 is not vertically intersected with the central shaft 21 and is positioned vertically above when the shutter structure 1 is installed, that is, disposed on the upper wall surface side of the flow path 2 with respect to the central shaft 21.

  Here, a cross section perpendicular to the central axis 21 is assumed. Since the flow path 2 is cylindrical, this cross section is circular. When this circular cross section is provided on the rotary shaft 3, as shown in FIG. 2B, the rotary shaft 3 divides the cross section into a main flow path 24 and a sub flow path 25, that is, the rotary shaft 3 is circular. It is provided on the string of the cross section. Since the rotary shaft 3 is closer to the upper wall surface than the central axis, the upper sub-channel 25 has a smaller area on the cross section than the lower main channel 24.

  The shutter structure 1 includes a main shutter 4 that rotates about the rotation shaft 3 and a sub shutter 5 that also rotates about the rotation shaft 3. That is, the main shutter 4 and the sub shutter 5 are provided coaxially with the rotation shaft 3 as the axis center.

  The main shutter 4 has a substantially semicircular shape with a large area when a plate-like disk is cut by a string corresponding to the rotary shaft 3. Further, the main shutter 4 has a double-ended curved structure in which an arc located near both ends of the rotary shaft 3 is pushed upstream from the rotary shaft 3 in a closed state. The string portion of the main shutter 4 is located on the rotation shaft 3, and the main flow path 24 is opened and closed by rotating about the rotation shaft 3.

  Further, the main shutter 4 includes a receiving portion 23 that prevents further upstream rotation from the vertically downward direction in the closed state. The receiving portion 23 is provided at the lower end portion of the upstream side surface of the main shutter 4, and further includes a cushion member 26 that suppresses the generation of sound at the time of contact with a stopper portion 22 described later.

  The sub-shutter 5 has a substantially semicircular shape with a small area when a plate-like disk is cut by a string corresponding to the rotary shaft 3. Here, the small area means that compared to the main shutter 4. The chord portion of the sub shutter 5 is located on the rotary shaft 3, and opens and closes the sub flow path 25 by rotating about the rotary shaft 3.

  A stop portion 22 corresponding to the receiving portion 23 of the main shutter 4 is provided on the lower wall surface side when the flow path 2 is installed. The stop portion 22 is provided at a position where the receiving portion 23 is locked at a position where the main shutter 4 covers the main flow path 24 most widely in the closed state. In the present embodiment, the position where the main shutter 4 is most widely shielded from the main flow path 24 is the lower end (open) of the main shutter 4 in a state where the main shutter 4 is suspended by its own weight with the rotary shaft 3 as the upper end. It is the position of the downstream end portion in the state.

  Further, on the lower wall surface side with respect to the vertical direction of the flow path 2, the flow area increases toward the upstream side from the position of the rotating shaft 3, in other words, the flow area decreases from the upstream suction port 6 toward the downstream side. The constriction structure 27 is provided.

  In the above configuration, when there is no fluid flow, both the main shutter 4 and the sub shutter 5 are closed. In the closed state, the main shutter 4 has the rotating shaft 3 as an upper end portion and the downstream end portion 28 in the vicinity of the receiving portion 23 is positioned vertically downward by its own weight. In this state, the main shutter 4 faces the upstream side on the upstream side and the downstream side on the downstream side. In the closed state, the sub shutter 5 has the rotary shaft 3 as a lower portion and the downstream end portion 29 is positioned vertically upward. In this state, the sub shutter 5 faces the upstream side on the upstream side and the downstream side on the downstream side. A mechanism in which the downstream end 29 of the sub shutter 5 is positioned vertically upward in the closed state will be described later.

  Next, details of the open state of the shutter structure will be described with reference to FIG. 3A is a perspective view in the open state of the shutter structure, and FIG. 3B is a cross-sectional view in the upstream view in the open state of the shutter structure. For the sake of understanding, the cylindrical flow path 2 is shown in cross section in FIG. FIG. 3 illustrates the case where there is a fluid flow, that is, the open state.

When there is a fluid flow with respect to the closed state shown in FIG. 2, that is, when a fluid flow is generated, the main shutter 4 is shifted to the open state by the fluid flow force, that is, the fluid force.
At the time of transition, the main shutter 4 receives fluid force on the upstream side surface, and rotates from the closed state parallel to the cross section to the open state perpendicular to the cross section about the rotation shaft 3. This rotation is a movement in which the downstream end 28 moves in a circular arc from the vertically lower side to the downstream side of the rotating shaft 3 around the rotating shaft 3.

  Further, the sub shutter 5 receives fluid force on the upstream side surface, and rotates from the closed state parallel to the cross section to the open state perpendicular to the cross section about the rotation shaft 3. This rotation is a movement in which the downstream end 29 moves in a circular arc from the vertically upper side to the downstream side of the rotating shaft 3 around the rotating shaft 3.

  As the downstream end portions 28 and 29 of the main shutter 4 and the sub shutter 5 are turned to the downstream side, the two shutters are folded into a V shape with the rotation shaft 3 as a vertex. With this folding structure, the downstream side surface of the main shutter 4 and the upstream side surface of the sub shutter 5 are superposed to form one superposed shutter.

  In the superposed shutter state, the upstream end portion of the shutter is configured to be close to the rotation shaft 3, that is, the shutter length on the upstream side of the rotation shaft 3 is shortened, so that the shutter behavior is stabilized against the fluid force. That is, the shutter fluctuation is less than that of a single shutter having no folding structure, and pressure loss and noise can be reduced.

  Further, since the shutter length in the flow direction is shortened, the resistance on the shutter surface, that is, the pressure loss can also be reduced.

  Further, since the shutter length in the flow direction is shortened, the cross-sectional area of the cross section of the overlapping shutter can be reduced as a whole, that is, a sufficient flow path can be secured in the open state. This is also apparent from a comparison between FIG. 3B and a cross-sectional view of the prior art conduit 102 composed of a single shutter.

  When there is no fluid flow in the open state, that is, when the fluid flow stops, the main shutter 4 shifts to the closed state due to its own weight. That is, the main shutter 4 rotates by its own weight from the open state perpendicular to the cross section to the closed state parallel to the cross section about the rotation shaft 3 as an axis. At this time, the sub shutter 5 also shifts from the open state to the closed state, details of which will be described later.

  Here, since the main shutter 4 shifts to the closed state by its own weight, a complicated drive device for moving the shutter is unnecessary, and a simple configuration can be achieved. That is, since it is a simple structure, a large ventilation cross-sectional area can be secured and pressure loss can be reduced.

  The structure of the main shutter 4 shown here, which transitions from the closed state to the open state by the fluid force of the fluid when there is a fluid flow, and transitions from the open state to the closed state by its own weight when there is no fluid flow. Is called the main opening / closing structure.

  The structure of the sub-shutter 5 that shifts from the closed state to the open state when there is a fluid flow, and that moves to the closed state by using the rotation of the main shutter 4 due to its own weight when there is no fluid flow. Is called a sub-opening / closing structure.

  Next, the details of the structure of each shutter will be described with reference to FIGS. 4A is a top perspective view of each shutter, and FIG. 4B is a bottom perspective view of each shutter. FIG. 5 is a partially enlarged view of the sub shaft hole in the sub shutter. In FIGS. 4 (a) and 4 (b), the shaft hole of each shutter is shifted for the sake of understanding.

  As shown in FIG. 4, the main shutter 4 includes a main shaft hole 31, a loose fitting portion 32, an urging portion 35, an engaging portion 36, and the both-end curved structure 38 described above.

  The main shaft hole 31 is a hole penetrating in a regular circle, and the main shutter 4 can be rotated by inserting the rotating shaft 3 into the two main shaft holes 31. However, the main shaft hole 31 does not need to be a through hole, and may be a hole with a closed bottom surface.

  The loose fitting portion 32 is a space that is recessed toward the center direction of the main shutter 4 from a line connecting the end portion 39 of the both-end curved structure 38 and the main shaft hole 31. In the closed state, the loose fitting portion 32 is fixed with the upstream end portion 34 of the sub shutter 5 entering.

  The urging portion 35 is configured as a projection that is opened from the main shaft hole 31 and protrudes upstream, and urges a later-described urged portion 37 by the rotation of the main shutter 4.

  The engaging portion 36 is a recess that engages with the downstream shape in the opened state of the sub-shutter 5, that is, the substantially semicircular shape with a small area described above. In the superposed shutter state, the vertical upper surface of the superposed shutter has no resistance to the fluid flow direction by engaging the upstream side surface of the sub shutter 5 and the engaging portion 36 constituting the downstream side surface of the main shutter 4. Constructs a smooth curved surface structure.

  As shown in FIG. 4, the sub shutter 5 includes a sub shaft hole 33, an upstream end 34 that is an upstream end in the opened state, and a biased portion 37.

  The sub-shaft hole 33 is a hole that has a substantially elliptical shape and is penetrated, and the sub-shutter 5 can be rotated by inserting the rotary shaft 3 into the two sub-shaft holes 33. The sub-shaft hole 33 is disposed on the outer side of the two main shaft holes 31 so that the holes coincide with each other.

  The biased portion 37 is provided on the downstream side surface of the sub shutter 5 and in the vicinity of the sub shaft hole 33 so as to protrude toward the sub shaft hole 33. The biased portion 37 is biased in a direction away from the main shaft hole 31 by the biasing portion 35 when the main shutter 4 and the sub shutter 5 are rotated.

  As shown in FIG. 5, the sub shaft hole 33 includes a long shaft 40, a bulging portion 41, a center of gravity shaft 42, an upstream end 43, and a downstream end 44.

  The major axis 40 means the major axis of the ellipse, and is substantially parallel to the length direction of the sub-shutter 5, that is, the direction from the upstream side to the downstream side when the substantially elliptical sub-shaft hole 33 is open, that is, in the overlapping shutter state. Has been placed. The term “parallel” as used herein means parallel to the fluid flow, but is included in parallel even if there is a slight inclination.

  The bulging portion 41 is a space that bulges from the elliptical shape toward the main shutter 4 in the open state of the sub-shutter 5, that is, in the overlapping shutter state. In FIG. 5, the elliptical shape including the dotted line bulges to the main shutter 4 side by the length of the arrow 45 to enlarge the elliptical area. The main shutter 4 side here has the same meaning as the direction of the downstream side surface in the sub shutter 5 or the downstream side in the closed state.

  The center of gravity axis 42 is an axis that passes through the center of the substantially elliptical shape and divides the upstream side and the downstream side in the open state of the sub shutter 5. In the open state, the center of the rotary shaft 3 is made to coincide with the center of gravity axis 42, so that the weights of the upstream side and the downstream side are equivalent, that is, the balance between the upstream side and the downstream side of the sub shutter 5 is kept equivalent. Be drunk.

  The upstream end 43 is an upstream end in the open state of the sub shaft hole 33.

  The downstream end 44 is a downstream end portion in the open state of the sub shaft hole 33.

  In the above structure, the rotary shutter 3 is positioned on the upstream end 43 side, so that the sub shutter 5 is in the downstream side gravity center state having the gravity center on the downstream side. Further, since the rotation shaft is positioned on the downstream end 44 side, the sub shutter 5 is in the upstream center of gravity state having the center of gravity on the upstream side. That is, the sub shutter 5 includes a center of gravity switching structure that can switch the center of gravity to the upstream side or the downstream side in the open state.

  Subsequently, an operation at the time of switching the center of gravity will be described with reference to FIGS. 6, 7, and 8. 6 is a side sectional view in the open state, FIG. 7 is a side sectional view in the middle of the transition from the open state to the closed state, and FIG. 8 is a side sectional view in the closed state.

  In the open state, the main shutter 4 and the sub shutter 5 are in the overlapping shutter state shown in FIG. In this state, the sub-shutter 5 is opened by the fluid force and receives pressure from the upstream side to the downstream side. Since the sub shutter 5 moves to the downstream side by this pressure, the rotary shaft 3 is positioned in contact with the upstream end 43. Since this state is the downstream side center of gravity state as described above, the sub-shutter 5 is engaged with the engaging portion 36 of the main shutter 4 by pressure bonding. By engaging, the sub-shutter 5 and the main shutter 4 are firmly connected to each other to form an integrated superposition shutter having a short length in the flow direction. Further, the curved surface structure 51 constituting the vertical upper surface of the superposition shutter can also maintain a smooth state against fluid fluctuations by pressure bonding and engagement.

  Further, the curved surface structure 51 suppresses flow separation and vortex generation on the shutter surface, so that pressure loss due to the shutter can be reduced.

  When the flow of the fluid stops, that is, when the state shifts from the open state to the closed state, as shown in FIG. 7, the main shutter 4 is rotated vertically downward about the rotation shaft 3 by an own weight (arrow 52).

  In the course of this rotation, the urging portion 35 urges the urged portion 37 far from the rotating shaft 3, here upstream and vertically upward.

  When the biased portion 37 is biased upstream and vertically upward, the rotating shaft 3 moves from the upstream end 43 to the downstream end 44. During this movement, the rotating shaft 3 reaches the downstream end 44 after passing through the bulging portion 41 from the upstream end 43 (lower left diagram in FIG. 7). By passing through the bulging portion 41, the sub shutter 5 is lifted with respect to the urging force of the urging portion 35, and shifts to the upstream side gravity center state. That is, it becomes possible to smoothly shift to the closed state without causing any catch when moving the center of gravity.

  When the rotary shaft 3 moves to the downstream end 44, the sub shutter 5 shifts to the upstream side gravity center state. As a result, the sub-shutter 5 is closed by its own weight in the direction of the arrow 52, that is, the upstream end 34 rotates in the direction of the central axis 21. Further, the main shutter 4 is closed by its own weight, in the direction of the arrow 53, that is, the downstream end 28 is rotated in the direction of the central axis 21.

  That is, since the sub shutter 5 is in the upstream center of gravity state in the transition from the open state to the closed state, the sub shutter can surely transition to the closed state without a complicated mechanism.

  When each shutter is in the closed state, as shown in FIG. 8, the upstream end portion 34 (the central axis side end portion in the closed state) enters the loose fitting portion 32, and the upstream end portion 34 is upstream of the main shutter 4. Supported by the side surface 60.

  That is, in the shutter structure 1, the sub shutter 5 is supported by the main shutter 4 in the closed state and the sub shutter 5 is supported by the main shutter 4, so that the sub shutter further rotates upstream. Can be prevented. Further, since the sub shutter 5 and the main shutter 4 are firmly pressure-bonded in a headwind, the stability similar to that of the single shutter can be provided although the shutter is two.

  In the closed state, the main shutter 4 is locked to the flow path 2 by the stop portion 22 coming into contact with the cushion member 26 of the receiving portion 23.

(Modification)
In the first embodiment, the sub shutter 5 is configured to open the sub flow path 25 by the fluid force of the fluid when there is a fluid flow.

  This eliminates the need for a driving device for opening the sub-shutter 5, so that the shutter structure can be simplified. On the other hand, the sub shutter 5 may be configured to open the sub flow path 25 by the rotational force generated by the transition of the main shutter 4 to the open state when there is a fluid flow. Specifically, the main shutter 4 and the sub shutter 5 are engaged with each other by a gear, and the sub shutter 5 is rotated in conjunction with the rotation of the main shutter 4.

  This also eliminates the need for a driving device for opening the sub-shutter 5, so that the shutter structure can be simplified. Further, since the rotational force is transmitted from the main shutter 4 to the sub shutter 5 without slipping, the certainty of opening and closing the shutter can be increased.

  However, in this configuration, when the main shutter 4 follows the fluid fluctuation, the strong connection between the main shutter 4 and the sub shutter 5 is released, so care must be taken.

(Outline of the embodiment)
A shutter structure according to an embodiment of the present invention includes a cylindrical flow channel through which a fluid flows from an upstream side to a downstream side, and the main channel on the cross section perpendicular to the central axis of the flow channel. A rotary shaft that is divided into sub flow paths having a smaller cross-sectional area than the main flow path, a main shutter that opens and closes the main flow path with the rotation axis as an axis, and a sub that opens and closes the sub flow path with the rotation axis as an axis A shutter, and when the fluid flows, the main shutter is rotated downstream from a closed state parallel to the cross section by a fluid force of the fluid to shift to an open state perpendicular to the cross section. A main opening / closing structure that transitions from the open state to the closed state by its own weight when there is no fluid flow, and the sub-shutter from a closed state parallel to the cross section when the fluid flows. Rotate downstream to A sub-opening / closing structure that shifts to an open state perpendicular to the surface and shifts to a closed state parallel to the cross section by using the rotation of the main shutter due to its own weight when the fluid does not flow.

  As a result, the main shutter and the sub-shutter overlap in the open state to shorten the shutter length in the flow direction, so that the resistance on the shutter surface, that is, pressure loss, can be reduced while maintaining the occlusion in the closed state. There is an effect.

  In addition, since it shifts to the closed state due to its own weight, a complicated drive device for moving the shutter is unnecessary, and a simple configuration can be achieved.In other words, the simple configuration makes it possible to expand the ventilation cross-sectional area and reduce pressure loss. There is an effect.

  In addition, since the shutter length on the upstream side of the rotating shaft in the open state is shortened, the shutter behavior is stabilized, and it is possible to reduce pressure loss and noise.

  Further, in the shutter structure according to an embodiment of the present invention, the sub shutter may be configured to open the sub flow path by the fluid force of the fluid when the fluid flows.

  This eliminates the need for a driving device for opening the sub-shutter, thereby providing an effect that the shutter structure can be simplified.

  Further, in the shutter structure according to an embodiment of the present invention, when the sub-shutter has the fluid flow, the sub-flow path is opened by a rotational force due to the transition to the open state of the main shutter. It may be configured to do.

  This eliminates the need for a driving device for opening the sub-shutter, thereby providing an effect that the shutter structure can be simplified. In addition, since the rotational force is transmitted from the main shutter to the sub shutter without slipping, the reliability of opening and closing the shutter can be increased.

  Further, in the shutter structure according to an embodiment of the present invention, in the opened state, the sub shutter has an upstream center of gravity state having a center of gravity on the upstream side with respect to the rotation axis, and a downstream side having a center of gravity on the downstream side. A center of gravity switching structure capable of switching between the center of gravity state is provided, and the upstream center of gravity state shifts from the open state to the closed state by its own weight, and the main shutter moves the sub shutter by rotating from the open state to the closed state. You may make it the structure which switches from the said downstream gravity center state to the said upstream gravity center state.

  As a result, the downstream center of gravity is in the open state, so that the shutter behavior is stabilized, and pressure loss and noise can be reduced. Further, in the transition from the open state to the closed state, the center of gravity is in the upstream side, so that the sub-shutter can be reliably shifted to the closed state without a complicated mechanism.

  Further, in the shutter structure according to an embodiment of the present invention, the center of gravity switching structure is such that the shaft hole of the sub shutter corresponding to the rotation axis has a substantially elliptical shape, and the major axis of the substantially elliptical shape is the It is arranged in parallel with the length direction of the sub-shutter, and the rotation shaft is located at the upstream end of the shaft hole in the open state of the sub-shutter so that the downstream side gravity center state is maintained, and from the open state of the main shutter The main shutter may urge the sub-shutter to the upstream side during the transition to the closed state, and the rotation shaft may be positioned at the downstream end of the shaft hole to switch to the upstream gravity center state.

  As a result, the sub shutter moves to the upstream center of gravity using the rotational force when the main shutter moves to the closed state due to its own weight, so no external force is required when switching the center of gravity and the switching structure is configured with a simple structure. There is an effect that can be done.

  In the shutter structure according to an embodiment of the present invention, the substantially elliptical shaft hole may further include a bulging portion that bulges toward the main shutter in the open state of the sub shutter. Good.

  Accordingly, the center of gravity shifts to the upstream center of gravity while being lifted by the urging force of the main shutter, so that it is possible to smoothly shift to the closed state.

  Further, the shutter structure according to one embodiment of the present invention has a curved surface structure that is smooth in the fluid flow direction in the open state due to the downstream side surface when the main shutter is closed and the upstream side surface when the sub shutter is closed. You may make it the structure provided with.

  As a result, flow separation and vortex generation on the shutter surface are suppressed, so that the pressure loss due to the shutter can be reduced.

  Further, the shutter structure according to an embodiment of the present invention may be configured to include a support structure that supports the central shaft side end of the sub-shutter on the upstream side surface of the main shutter in the closed state.

  Thereby, when there is a back wind from the downstream side, the sub shutter is supported by the surface of the main shutter, so that the sub shutter can be prevented from rotating upstream. Further, since the sub-shutter and the main shutter are firmly pressure-bonded in a headwind, the stability similar to that of the single shutter can be provided even though the shutter is two.

  Moreover, you may make it the structure which equips the air blower with the shutter structure which concerns on one embodiment of this invention.

  As a result, the pressure loss and noise due to the shutter in the open state can be reduced while maintaining the closing property in the closed state, so that it is possible to provide a blower device that improves the efficiency of air blowing while preventing malfunctions due to headwinds and reduces noise. There is an effect.

  The shutter structure according to the present invention increases the ventilation cross-sectional area in the open state, reduces pressure loss due to the shutter, and increases the sense of stability. Therefore, the shutter structure flows mainly through a ventilation fan or a pump. It is useful as a shutter structure used for preventing fluid backflow.

DESCRIPTION OF SYMBOLS 1 Shutter structure 2 Flow path 3 Rotating shaft 4 Main shutter 5 Sub shutter 6 Upstream inlet 7 Downstream outlet 8 Blower 9 Casing 10 Motor 11 Fan 12 Blower 13 Inlet 14 Outlet 15 Fluid flow 16 Outer 20, 45 , 52, 53 Arrow 21 Central shaft 22 Stopping portion 23 Receiving portion 24 Main flow path 25 Sub flow path 26 Cushion member 27 Narrow structure 28, 29 Downstream side end portion 31 Main shaft hole 32 Free fitting portion 33 Sub shaft hole (shaft hole) Fall under)
34 upstream end 35 biasing portion 36 engaging portion 37 biased portion 38 curved structure at both ends 39 end 40 long shaft 41 bulging portion 42 center of gravity axis 43 upstream end 44 downstream end 51 curved surface structure

Claims (9)

A cylindrical flow path through which fluid flows from the upstream side to the downstream side;
A rotating shaft that divides the flow path into a main flow path and a sub flow path having a smaller cross-sectional area than the main flow path on a cross section perpendicular to the central axis of the flow path;
A main shutter that opens and closes the main flow path about the rotation axis;
A sub shutter that opens and closes the sub flow path with the rotation axis as an axis,
The main shutter is
When there is a flow of the fluid, the fluid force of the fluid turns from the closed state parallel to the cross section to the downstream side to shift to the open state perpendicular to the cross section,
When there is no flow of the fluid, the main opening and closing structure that shifts from the open state to the closed state by its own weight,
The sub shutter is
When there is a flow of the fluid, it moves from the closed state parallel to the cross section to the downstream side and shifts to the open state perpendicular to the cross section,
A shutter structure comprising a sub-opening / closing structure that shifts to a closed state parallel to the cross section by utilizing the rotation of the main shutter by its own weight when there is no fluid flow. The sub shutter is
The shutter structure according to claim 1, wherein when there is a flow of the fluid, the sub flow path is opened by a fluid force of the fluid. The sub shutter is
2. The shutter structure according to claim 1, wherein when there is a flow of the fluid, the sub flow path is opened by a rotational force due to the transition of the main shutter to the open state. The sub shutter is
A center of gravity switching structure capable of switching between an upstream center of gravity state having a center of gravity on the upstream side and a downstream side center of gravity state having a center of gravity on the downstream side in the open state;
In the upstream center of gravity state, it shifts from the open state to the closed state by its own weight,
The main shutter is
The shutter structure according to any one of claims 1 to 3, wherein the sub shutter is switched from the downstream side gravity center state to the upstream side gravity center state by rotation from an open state to a closed state. The center of gravity switching structure is
The shaft hole of the sub shutter corresponding to the rotation axis has a substantially elliptical shape, and the major axis of the substantially elliptical shape is arranged in parallel to the length direction of the sub shutter,
In the open state of the sub-shutter, the rotating shaft is located at the upstream end of the shaft hole so as to maintain the downstream side gravity center state,
When the main shutter shifts from the open state to the closed state, the main shutter urges the sub shutter to the upstream side, and the rotation shaft is positioned at the downstream end of the shaft hole, thereby switching to the upstream side gravity center state. The shutter structure according to claim 4. The substantially elliptical shaft hole is
Furthermore, the shutter structure of Claim 5 provided with the bulging part which bulges in the said main shutter side in the open state of the said sub shutter. In the open state
The shutter structure according to any one of claims 1 to 6, further comprising a curved surface structure smooth in a fluid flow direction by a downstream side surface when the main shutter is closed and an upstream side surface when the sub shutter is closed. In the closed state,
The shutter structure according to any one of claims 1 to 7, further comprising a support structure that supports an end of the sub shutter on the central axis side on an upstream side surface of the main shutter. The air blower provided with the shutter structure of any one of Claim 1 to 8.

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