JP2011038495A - Jet fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet fan which can reverse a blowing direction, has high aerodynamic performance in any blowing directions, has low running cost and manufacturing cost, and is excellent in reliability. <P>SOLUTION: In the jet fan, an electric motor rotating in one direction is supported in a cylindrical casing via a plurality of stator vanes also serving as support columns. In the jet fan, also an impeller provided with a plurality of rotor vanes each having a shaft unsymmetrical blade-shaped blade cross-sectional surface is rotatably attached to an electric motor shaft protruded from one side end of an electric motor case, to thereby blow air currents whose pressure is increased by rotation of the impeller and whose flow is then straightened to become parallel to each other. The casing includes an inner casing supporting the stator vanes and a casing body disposed outside the inner casing. The inner casing is reversibly and axially supported at a 180-degree angle on a horizontal plane, with respect to respective reverse shafts disposed at an apex and a center of a bottom plane of the inner casing. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a jet fan installed on a ceiling of a tunnel for ventilation in a road tunnel.

  In general, in road tunnels, harmful substances such as soot, carbon monoxide, and nitrogen oxides contained in the exhaust gas of automobiles are exhausted outside the tunnel, and fresh outside air is taken in. In addition, ventilation equipment is used for exhaust in the event of a fire. As a ventilation device that is necessary and is widely used, a jet fan is known which is attached to a ceiling or a side wall in a tunnel along a road extending direction.

  Jet fans can be easily installed in tunnels at low cost even after tunnel construction, and have the advantage of being able to be applied in combination with multiple jet fans even in long distance tunnels. ing.

  By the way, the jet fan is required to ventilate in both directions of the tunnel because it is necessary to change the air blowing direction according to the traffic volume in each traveling direction and the pressure difference between the wellheads. In the jet fan, the moving blades having the axisymmetric blade shape are attached in the same phase, and there is a problem that the efficiency is lowered when the blade rotates in the reverse direction.

  Therefore, means for switching the blowing direction by rotating the jet fan itself is also implemented, but a large-sized and heavy jet fan itself requires a large capacity electric motor and a complicated configuration, which is expensive. In addition, there is a problem that maintenance and inspection are also necessary.

  Therefore, jet fans having means for switching the blowing direction without rotating the jet fan itself are disclosed in, for example, JP-A-8-31588 (Patent Document 1) and JP-A-2004-278349 (Patent Document 2). Is presented.

  As shown in FIG. 4A, the jet fan presented in these publications has an electric motor (not shown) by a support column 3 in a cylindrical motor casing 2 in which cylindrical silencers 1 and 1 are connected to both ends. 1) is mounted so that the motor 4 is rotatably supported with respect to the motor casing 2, and an impeller 7 in which a plurality of blades 5 and an impeller cap 6 are arranged on the motor shaft protruding from the motor 4 is attached. As shown in FIG. 4B, the driving mechanism 8 disposed at the upper end of the support column 3 is reversed 180 degrees to switch the blowing direction without rotating the jet fan itself.

  However, in the jet fan presented in the above publication, since the motor casing is rotated, a stationary blade cannot be provided in the air passage formed between the motor 4 and the motor casing 2.

  For this reason, since the direction of the air flow boosted by the moving blade 5 is swirled in the silencer 1 while being inclined in the circumferential direction with respect to the axial direction, only the axial component of the swirling flow contributes to ventilation, and the wall surface of the silencer 1 There exists a problem that ventilation efficiency becomes low by friction.

JP-A-8-312588 JP 2004-278349 A

  The present invention has been made to solve the above-described problems of conventional jet fans. In addition to reversing the blowing direction, the aerodynamic performance is high in any blowing direction, and the running cost is high. Another object of the present invention is to provide a jet fan with low manufacturing cost and excellent reliability.

  In order to solve the above problems, the jet fan according to the present invention includes an electric motor that rotates in one direction and is supported inside a cylindrical casing via a plurality of stationary blades that also serve as support pillars. An impeller provided with a plurality of moving blades having a cross section of an axially asymmetric blade shape on a motor shaft that protrudes from one side end of the blade is rotatably attached, and the airflow increased by the rotation of the impeller In the jet fan that rectifies and blows air into a parallel flow by the stationary blade, the casing includes an inner casing that supports the stationary blade and a casing body that is disposed outside the inner casing, and a top portion and a bottom portion of the inner casing. The inner casing is pivotally attached to the reversing shafts arranged at the center of each plane so as to be reversible at an angle of 180 degrees in the horizontal plane. To.

  According to the present invention, even if it is a simple structure, not only the air blowing direction is reversed, but also in any air blowing direction can be reversed including the stationary blade, so that the swirling flow boosted by the moving blade is rectified. As a result, almost all of it becomes an axial component, so that the blowing efficiency does not decrease.

  In the present invention, when a drive mechanism for rotating the reversing shaft is installed in the casing body, the reversal can be controlled easily and automatically by controlling the drive mechanism.

  Furthermore, when a positioning mechanism is provided between the casing main body and the inner casing, it can be accurately reversed, and is particularly effective for automation.

  ADVANTAGE OF THE INVENTION According to this invention, the reversal | inversion of a ventilation direction is easy, aerodynamic performance is high, a running cost and a manufacturing cost are low, and the jet fan excellent in reliability can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS The external appearance perspective view which made the cross section the part which shows embodiment in this invention. The longitudinal cross-sectional view in embodiment shown in FIG. FIG. 2 is a cross-sectional view of the embodiment shown in FIG. The perspective view which made the cross section the part which shows a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 3 show a preferred embodiment of the present invention, in which a cylindrical motor casing 2 having cylindrical silencers 1 and 1 connected to both ends is connected to the silencer 1 and 1 outside. The inner casing 22 is supported by reversing shafts 31 and 32 disposed in the center of the top surface 221 and the bottom surface 222, respectively. The casing body 21 is rotatable.

  Inside the inner casing 22, a number of stationary blades 9 are installed between the inner wall of the inner casing 22 and the electric motor 4 that rotates in one direction is supported along the central axis.

  Further, an impeller 7 in which a plurality of moving blades 5 having an axially asymmetric blade shape blade cross section and an impeller cap 6 are arranged on an electric motor shaft protruding from the electric motor 4 is attached. The air sucked from the intake port 223 of the inner casing 22 is converted into a pressurized air flow and rectified into a parallel flow by the stationary blade 9 and exhausted or blown from the exhaust port 224.

  Furthermore, a drive mechanism 8 for rotating the reversing shaft 31 is installed at the top of the casing body 21. This drive mechanism may be any mechanism that can rotate the reversing shaft 31 such as an electric motor and various cylinders and can be reversed and driven at an angle of at least 180 degrees. In particular, a control device (not shown) provided separately. It is preferable to perform reverse control by remote operation.

  Further, the bottom surface 222 of the inner casing 22 includes a positioning projection 10, 10 that is fitted into an arc-shaped locking groove (not shown) formed inside the bottom surface of the casing body 21. Is provided.

  In addition, in the present embodiment, auxiliary frames 23 are provided on both sides of the casing body 21 to reinforce the casing body 21 that supports the inner casing 22.

  The present embodiment having the above configuration is suspended and supported on the ceiling of a tunnel such as a highway by a wire, an anchor member, or the like that is locked to the top of the casing body 21 as in the conventional jet fan of this type. At this time, for example, as shown in FIG. 2A, the inner casing 22 is arranged in a state where the impeller 7 is positioned on the right side of the electric motor 4 in the drawing, and when the electric motor is rotated when necessary, the impeller 7 The air flow boosted by the rotation is rectified into a parallel flow by the stationary blade 9 and blown from the right side to the left side in the figure.

  Then, when it becomes necessary to change the air blowing direction according to the traffic volume in each traveling direction in the tunnel or the pressure difference between the wellheads, in the present embodiment, the drive mechanism 8 is driven by remote control and reversed. As shown in FIG. 2B, the shaft 31 is rotated 180 degrees so as to be reversed in the left-right direction as shown in the figure. The air flow increased by rotating the impeller 7 and rotating the impeller 7 The air can be blown in the direction opposite to that shown in FIG. Moreover, since it can be returned to the original state shown in FIG. 2A by the reverse operation, it can be appropriately selected according to the situation.

  As described above, according to the present embodiment, the air flow boosted by the rotation of the impeller 7 is rectified into a parallel flow by the stationary blades 9 by a very simple operation of simply reversing the reversing shaft 31 by the drive mechanism 8. In particular, not only the flow direction components of the airflow can all contribute to ventilation, but also the efficiency degradation due to the wall friction of the silencer 1 is minimized, so that aerodynamics High performance, low running and manufacturing costs, and excellent reliability.

  In the present embodiment, the inner casing 22 has an excellent configuration such as a substantially circular plane, or a reinforcing auxiliary frame 23 and a side frame 24 projecting from the casing body 21. The present invention is not limited to this embodiment, and an electric motor that rotates in one direction and is rotatably attached to an impeller provided with a plurality of moving blades having a cross section of an asymmetrical blade shape on the motor shaft is accommodated. The motor case is supported inside the cylindrical inner casing via a plurality of stationary blades that also serve as support pillars, and the inner casing is inverted at an angle of 180 degrees in a horizontal plane with respect to the casing main body arranged outside the casing. It only needs to be pivotally attached.

  DESCRIPTION OF SYMBOLS 1 Silencer, 2 Motor casing, 3 support | pillar, 4 Motor case, 5 Rotor blade, 6 Impeller cap, 7 Impeller, 8 Drive mechanism, 9 Stator blade, 21 Casing main body, 22 Inner casing, 31 Reverse shaft

Claims (3)

  A motor rotating in one direction is supported inside a cylindrical casing via a plurality of stationary blades that also serve as support columns, and an asymmetric blade shape is formed on the motor shaft that protrudes from one side end of the motor case. In a jet fan in which an impeller provided with a plurality of moving blades having a blade cross section is rotatably attached, and the air flow boosted by the rotation of the impeller is rectified into a parallel flow by the stationary blade and blown The casing includes an inner casing that supports the stationary vane and a casing body that is disposed outside the inner casing, and the inner casing is in a horizontal plane at a reversing shaft that is disposed at the center of the top and bottom of the inner casing. A jet fan characterized by being pivotally mounted at an angle of 180 degrees so as to be reversible.   The jet fan according to claim 1, wherein a driving mechanism for rotating the rotating shaft is installed in the casing body.   The jet fan according to claim 1, wherein a positioning mechanism is provided between the casing body and the inner casing.

Images