JP4648032B2 - Blower and air conditioner using the same - Google Patents

Description

  The present invention relates to a blower and an air conditioner using the blower.

  As a conventional air conditioner using a blower by a multiblade blower fan (hereinafter referred to as “sirocco fan”), for example, one described in Patent Document 1 below is known. As shown in FIG. 8, the air conditioner described in Patent Document 1 has a diffuser 20 disposed so as to surround the sirocco fan 10, and a fin-and-tube heat exchanger is disposed around the diffuser 20. (Not shown) is provided, and the kinetic energy (dynamic pressure) of the air blown from the inner peripheral side to the outer peripheral side of the sirocco fan 10 by the sirocco fan 10 is converted into pressure energy (static pressure) by the diffuser 20. By converting and recovering and sending it to the outer peripheral side of the diffuser 20, the heat exchanger can be blown to perform air conditioning.

Japanese Patent Laid-Open No. 2004-060622

  By the way, in the air conditioner, it is strongly required to further increase the blowing power while maintaining the size reduction. For this reason, for example, in the conventional air conditioner as described above, when the rotational speed of the sirocco fan 10 is increased so as to increase the blowing power, there is a problem that high-frequency noise such as wind noise becomes very large. It has been difficult to further improve the blowing power.

  In view of the above, an object of the present invention is to provide a blower capable of improving silence and improving blowing power, and an air conditioner using the blower.

  The blower according to the first invention for solving the above-described problem is a multiblade blower fan that is driven and rotated by a plurality of main blades arranged in the circumferential direction on the radially outer surface of the hemispherical main plate, A blower comprising an annular diffuser having a plurality of main stator blades disposed in a circumferential direction so as to surround the multiblade fan, wherein the main stator blades of the diffuser are rotated by the multiblade fan. It is characterized by being bent into a substantially S shape so as to have two inflection points in a cross-sectional shape perpendicular to the axial direction.

  The blower according to a second invention is characterized in that, in the first invention, the diffuser includes sub stator vanes provided between the adjacent main stator blades.

  A blower according to a third aspect of the present invention is the blower according to the first or second aspect, wherein a plurality of the multi-blade blow fans are provided on a radially inner side surface of the main plate so as to be positioned between the adjacent main blades. And a vent groove formed between the back surface side of the main rotor blade and the abdominal surface side of the sub rotor blade of the main plate.

  The blower according to a fourth aspect of the present invention is the air blower according to any one of the first to third aspects, wherein the space between the multi-blade fan and the diffuser and the inner side in the rotational radial direction of the multi-blade fan are provided. A labyrinth seal is disposed below the multiblade fan so as to partition.

  An air conditioner according to a fifth aspect of the present invention for solving the above-described problem is disposed so as to surround the blower of any one of the first to fourth aspects of the invention and the periphery of the blower. And a heat exchanger.

  An air conditioner according to a sixth invention is the air conditioner according to the fifth invention, above the diffuser so as to partition between the diffuser and the heat exchanger and between the multiblade fan and the diffuser. And the lower part is shielded.

  According to the blower according to the present invention and the air conditioner using the blower, the silence can be improved and the blowing power can be increased.

  EMBODIMENT OF THE INVENTION Embodiment of the air blower which concerns on this invention, and the air conditioner using this is described based on FIGS. FIG. 1 is a schematic structural diagram of an air conditioner, FIG. 2 is a longitudinal sectional view of the air conditioner of FIG. 1, FIG. 3 is an extracted perspective view of a main part of the air conditioner of FIG. 3 is an extracted perspective view of a moving blade of the air conditioner of FIG. 3, FIG. 5 is a partially extracted enlarged view of the moving blade of FIG. 4, FIG. 6 is an extracted perspective view of a stationary blade of the air conditioner of FIG. FIG. 7 is a partially extracted enlarged view of the stationary blade of FIG. 6.

  As shown in FIGS. 1 and 2, a drive motor 102 is attached to a central portion of a box-shaped case 101. A multi-blade blower fan (hereinafter referred to as “sirocco fan”) 110 is coaxially attached to the drive shaft of the drive motor 102, and the sirocco fan 110 has the following structure.

  As shown in FIGS. 2 to 4, a plate-shaped main rotor blade 112 is formed on the radially outer surface of the hemispheric main plate 111 connected to the drive shaft of the drive motor 102 so as to surround the drive motor 102. Are arranged in the circumferential direction (rotation direction), and the main rotor blade 112 is curved in an arc shape with a cross-sectional shape orthogonal to the rotation axis direction so that the center of curvature radius is located on the front side in the rotation direction. ing. As shown in FIG. 5, the main rotor blades 112 are set such that the length (code length) Lm in the rotational radial direction is twice or more as large as the interval (pitch) Pm adjacent to each other. The blade outlet angle θme is set to 110 to 125 °.

  As shown in FIGS. 2 to 5, on the radially inner side surface of the main plate 111, along the circumferential direction (rotation direction) so that the plate-like auxiliary moving blades 113 are respectively positioned between the adjacent main moving blades 112. The auxiliary rotor blades 113 are arranged in a circular arc shape in a cross-sectional shape perpendicular to the rotational axis direction so that the center of curvature radius is located on the front side in the rotational direction, that is, along the main rotor blades 112. And curved.

  A ventilation groove 111a is formed between the back surface side of the main rotor blade 112 and the abdominal surface side of the auxiliary rotor blade 113 of the main plate 111, and the ventilation groove 111a has a radius of curvature centered on the front side in the rotation direction. Is curved in a circular arc shape with a cross-sectional shape orthogonal to the rotational axis direction, that is, along the main rotor blade 112 and the sub rotor blade 113.

  As shown in FIGS. 1 to 3, an annular diffuser 120 is attached to the inside of the case 101 so as to be coaxial with the sirocco fan 110 and surround the sirocco fan 110. 120 has the following structure.

  As shown in FIGS. 1, 2, and 6, a plurality of plate-shaped main stationary blades 122 are disposed in the circumferential direction between a pair of annular casing plates 121 disposed to face each other, The main stationary blade 122 has an inner peripheral side of the casing plate 121 located at the center of the radius of curvature on the front side in the rotational direction of the sirocco fan 110, and an outer peripheral side of the casing plate 121 on the rear side in the rotational direction of the sirocco fan 110. The sirocco fan 110 is bent in a substantially S shape so as to have two inflection points in a cross-sectional shape orthogonal to the rotational axis direction of the sirocco fan 110 so that the center of curvature radius is located at the center. As shown in FIG. 7, these main stationary blades 122 have a blade inlet angle θsi set to 10 to 30 ° and a blade outlet angle θse set to 45 to 75 °.

  As shown in FIGS. 1, 2, and 6, between the casing plates 121, plate-shaped sub stator blades 123 are respectively disposed so as to be positioned between the adjacent main stator blades 122, As shown in FIG. 7, the auxiliary stator blade 123 has a shape and number (this embodiment) so that the equivalent enlarged angle θsp between the adjacent main stator blades 122 is 6 to 8 ° (preferably 7 °). Then, two sheets are set between the main stator blades 122).

  In the diffuser 120, the inner diameter size formed by the above-described arrangement of the main stationary blades 122 is 1.2 times or more the outer diameter size formed by the above-described arrangement of the main rotor blades 112 of the sirocco fan 110. I am doing.

  As shown in FIGS. 1 to 3, a fin & tube heat exchanger 103 is attached to the inside of the case 101 so as to surround the diffuser 120. A drain pan 104 is attached to the lower end of the heat exchanger 103.

  Between the lower end of the main rotor blade 112 of the sirocco fan 110 and the inner peripheral end of the casing plate 121 below the diffuser 120, between the sirocco fan 110 and the diffuser 120, and A labyrinth seal 107 is provided so as to partition the inside of the sirocco fan 110 in the rotational radial direction.

  Between the lower surface of the casing plate 121 below the diffuser 120 and the radially inner end of the drain pan 104 between the diffuser 120 and the heat exchanger 103 and the sirocco fan 110. A pressure bulkhead 108 that shields the lower side of the diffuser 120 is disposed so as to partition the diffuser 120 and the diffuser 120.

  A space between the diffuser 120 and the heat exchanger 103 and a sirocco fan 110 and the diffuser 120 are partitioned between the upper surface of the casing plate 121 at the upper part of the diffuser 120 and the inner surface of the case 101. In this manner, a pressure partition 109 that shields the upper side of the diffuser 120 is provided.

  In FIG. 2, reference numeral 105 denotes an electrical equipment case that stores electrical equipment members.

  Next, the operation of the air conditioner according to this embodiment will be described.

  When the sirocco fan 110 is rotated by operating the drive motor 102, air in the room or the like is sucked from below in the radial direction of the sirocco fan 110 due to the rotational motion of the main rotor blade 112, thereby causing the main rotor blade 112 to move. The kinetic energy (dynamic pressure) is converted into pressure energy (static pressure) and collected by passing through the main stationary blade 122 and the auxiliary stationary blade 123 from the radially inner side of the diffuser 120. It is sent to the outside in the radial direction, passes through the heat exchanger 103 and exchanges heat, thereby adjusting the temperature and returning it to the room.

  On the other hand, the air on the radially inner side surface of the main plate 111 of the sirocco fan 110 is moved to the radially outer surface side of the main plate 111 via the ventilation groove 111a of the main plate 111 by the rotational movement of the main rotor blade 122. It flows out from the sirocco fan 110 together with the air that has flowed out and sucked from the room, and a part of the air sent out from the sirocco fan 110 is from the upper side of the sirocco fan 110 to the radially inner side of the main plate 111. The air flows into the main plate 111 to generate an air flow on the radially inner side surface, so that the drive motor 102 can be cooled.

  In the air conditioner according to this embodiment that performs air conditioning in the room or the like in this way, the diffuser 120 is substantially S-shaped so that the main stationary blade 122 has two inflection points as described above. Since it is bent, the air sent from the sirocco fan 110 can be taken in smoothly, and the swirl of the flow of air sent to the heat exchanger 103 can be greatly reduced. Therefore, air can be supplied to the heat exchanger 103 from substantially the front, and the generation of high-frequency wind noise when air flows in an oblique direction with respect to the fins of the heat exchanger 103 is greatly suppressed. be able to.

  Further, since the diffuser 120 has the auxiliary stationary blade 123 as described above between the adjacent primary stationary blades 122, the separation flow of the air flowing through the inside is suppressed, and the kinetic energy (dynamic pressure) is suppressed. Since the efficiency of conversion and recovery into pressure energy (static pressure) can be increased, the blowing power can be increased.

  In addition, the sirocco fan 110 is erected on the radially inner side surface of the main plate 111 so that the auxiliary moving blade 113 is positioned between the main moving blades 112, and the back side of the main moving blade 112 of the main plate 111 and the Since there is a ventilation groove 111a between the auxiliary rotor blade 113 and the abdominal surface side, the static pressure that has flowed in again from above into the radially inner side surface of the main plate 111 due to the rotational movement of the auxiliary rotor blade 113. Since a part of high air can be sent out from the ventilation groove 111a to the back side (negative pressure surface side) of the main rotor blade 112, the radial inner end of the main rotor blade 112 (inlet end portion, front edge portion) The air can be sent radially outward without being in direct contact, and the generation of high-frequency wind noise due to the contact can be greatly suppressed, and is generated on the back side (negative pressure surface side) of the main rotor blade 112. Easy peeling flow It can be suppressed to the width, very stabilized passage between the flow of the driving blade 112, it is possible to significantly improve the blowing force.

  On the other hand, since the labyrinth seal 107 is provided so as to partition between the sirocco fan 110 and the diffuser 120 and the inside in the rotational radial direction of the sirocco fan 110, the diffuser 120 for the air sent from the sirocco fan 110 Since it is possible to prevent the influence of the nonuniform velocity field or pressure field in the circumferential direction caused by the interference from being transmitted to the inside of the sirocco fan 110 in the rotational radial direction, the generation of high-frequency wind noise due to the influence is greatly suppressed. be able to.

  In addition, pressure partitions 108 and 109 are provided so as to separate the diffuser 120 and the heat exchanger 103 and the sirocco fan 110 and the diffuser 120 so as to shield the lower and upper sides of the diffuser 120. Therefore, it is possible to prevent the air having the highest static pressure sent from the diffuser 120 from flowing back into the radial inner side of the diffuser 120, and to increase the static pressure of the air to be supplied to the heat exchanger 103. Since it can utilize effectively, ventilation power can be raised.

  Therefore, according to the air blower which concerns on this embodiment, and the air conditioner using this, silence can be improved and an air blowing force can be raised.

  In addition, the length (code length) Lm of the main rotor blade 112 of the sirocco fan 110 in the rotational radial direction is set to be twice or more the interval (pitch) Pm adjacent to each other, and the blade outlet angle θme is set. Since it is set in the range of 110 to 125 °, the air sending angle with respect to the main stationary blade 122 of the diffuser 120 and the effect of increasing the static pressure can be maintained in the most balanced manner, improving the quietness and improving the blowing power. Can be achieved most effectively.

  Further, the blade inlet angle θsi of the main stator blade 122 of the diffuser 120 is set to 10 to 30 °, and the blade outlet angle θse is set to 45 to 75 °, while the equivalent enlarged angle θsp between the main stator blades 122 is set to 6 Since the auxiliary stationary blade 123 is provided so as to be ˜8 ° (preferably 7 °), the smooth flow of air and the effect of increasing the static pressure until it is received from the sirocco fan 110 and sent to the heat exchanger 103 are most effective. The balance can be maintained, and the balance between the improvement of the silence and the improvement of the blowing power can be most effectively obtained.

  Further, since the inner diameter size of the diffuser 120 is set to be 1.2 times or more the outer diameter size of the sirocco fan 110, the periodic sound is reduced by potential interference between the sirocco fan 110 and the diffuser 120, and the diffuser 120 is moved to. It is possible to suppress the dynamic pressure of the air to be fed, and it is possible to further enhance the coexistence between the improvement of silence and the improvement of the blowing power.

  In this embodiment, between the lower surface of the casing plate 121 at the lower part of the diffuser 120 and the end of the drain pan 104 on the radially inner side of the diffuser 120, and the upper surface of the casing plate 121 at the upper part of the diffuser 120, By disposing the pressure bulkheads 108 and 109 between the inner surface of the case 101, the lower part of the diffuser 120 is separated from the diffuser 120 and the heat exchanger 103 and between the sirocco fan 110 and the diffuser 120. For example, the casing plate 121 between the lower surface of the lower casing plate 121 of the diffuser 120 and the end of the drain pan 104 on the radially inner side of the diffuser 120, and the upper portion of the diffuser 120. The upper surface of 121 and the inner surface of case 101 are in direct contact with each other. By Unisuru, it is possible to shield the lower and upper diffuser 120 to partition and between the between the sirocco fan 110 and the diffuser 120 of the diffuser 120 and the heat exchanger 103.

  Since the air blower according to the present invention and the air conditioner using the air blower can improve the silence and increase the air blowing force, they can be used extremely beneficially industrially.

It is a schematic structure figure of an embodiment of an air harmony machine concerning the present invention. It is longitudinal direction sectional drawing of the air conditioner of FIG. It is an extraction perspective view of the principal part of the air conditioner of FIG. It is the extraction perspective view of the moving blade of the air conditioner of FIG. It is a partial extraction enlarged view of the moving blade of FIG. It is the extraction perspective view of the stationary blade of the air conditioner of FIG. It is a partial extraction enlarged view of the stationary blade of FIG. It is a schematic block diagram of an example of the conventional air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Case 102 Drive motor 103 Heat exchanger 104 Drain pan 105 Electrical case 107 Labyrinth seal 108,109 Pressure partition 110 Multiblade fan (sirocco fan)
111 Main plate 111a Ventilation groove 112 Main blade 113 Sub blade 120 Diffuser 121 Casing plate 122 Main vane 123 Sub vane

Claims (6)

A multi-blade fan that rotates by driving a plurality of main rotor blades in the circumferential direction on the radially outer surface of the hemispherical main plate;
A blower comprising: an annular diffuser that is disposed so as to surround the multi-blade fan and has a plurality of main stator blades in the circumferential direction;
The blower, wherein the main stationary blade of the diffuser is bent in a substantially S shape so as to have two inflection points in a cross-sectional shape orthogonal to the rotational axis direction of the multiblade fan. In claim 1,
The blower, wherein the diffuser includes sub stator blades provided between the adjacent main stator blades. In claim 1 or claim 2,
The multi-blade fan is
A plurality of auxiliary blades erected on the radially inner side surface of the main plate so as to be positioned between the adjacent main blades;
A blower comprising: a ventilation groove formed between a back surface side of the main rotor blade and a ventral surface side of the sub rotor blade of the main plate. In any one of Claims 1-3,
A labyrinth seal is disposed below the multi-blade fan so as to partition between the multi-blade fan and the diffuser and the inner side in the rotational radial direction of the multi-blade fan. Blower. A blower according to any one of claims 1 to 4,
An air conditioner comprising: a heat exchanger disposed so as to surround the blower. In claim 5,
An air conditioner characterized in that the upper and lower sides of the diffuser are shielded so as to partition between the diffuser and the heat exchanger and between the multi-blade fan and the diffuser.

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