JP2009235907A - Series connection type blower device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a series connection type blower device including a first single-unit axial flow blower and a second single-unit axial flow blower, which are put in relative rotation and connected with each other, capable of precluding such an occurrence when the two are to be connected that, part of their leads are bitten in between two sidewalls of a first web and a second web where a plurality of leads are threaded through, or part of the leads are no more accommodatable in a first and a second lead guide web. <P>SOLUTION: Among a pair of sidewalls 43 and 45 of the first web 19, one 43 located ahead in the relative rotational direction D1 when the first single-unit axial flow blower 1 and the second single-unit axial flow blower 3 are put in relative rotation, is arranged lower in its height from the bottom wall part 41 than the other sidewall 45 positioned behind in the relative rotational direction D1. Among a pair of sidewalls 83 and 85 of the second web 59, one 83 located ahead in the relative rotational direction D2 when the first single-unit axial flow blower 1 and the second single-unit axial flow blower 3 are put in relative rotation, is arranged lower in its height from the bottom wall part 81 than the other sidewall 85 positioned behind in the relative rotational direction D2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a serial connection type blower in which two single axial flow fans are connected in series.

Japanese Patent Application Laid-Open No. 2004-278371 discloses a serial connection type air blower configured by connecting a first single axial flow fan and a second single axial flow fan in series. The first and second single axial flow fans each include a housing, an impeller having a plurality of blades, a motor that rotates the impeller, a motor support that supports a stator of the motor, a housing, and a motor support And three webs connecting the sections. The first and second single axial flow fans have the first single axial flow blower and the second single axial flow blower in a state in which the axes of the first single axial flow blower and the second single axial flow blower coincide with each other. It has a structure in which the single axial flow fan is brought into an engaged state by being relatively rotated by a predetermined angle about the axis. The three first webs of the first single axial flow fan and the three second webs of the second single axial flow fan are the first single axial flow fan and the second single axial flow. Each shape is determined so as to form three stationary blades in alignment with the blower connected. A first lead wire guide groove through which a plurality of first lead wires pass is formed in one of the three first webs, and a plurality of first webs are formed in the first housing. A first lead wire lead-out groove for leading one lead wire to the outside of the first housing is formed. Also, a second lead wire guide groove through which a plurality of second lead wires pass is formed in one second web of the three second webs, and a plurality of second lead wires are also formed in the second housing. A second lead wire lead-out groove is formed to lead out the second lead wire to the outside of the second housing. The first and second webs through which the lead wire passes include a bottom wall portion that constitutes a bottom portion of the lead wire guide groove and a pair of side wall portions that are located on both sides of the lead wire guide groove. And a pair of side wall part is formed so that the height dimension from a bottom wall part may become the same dimension. In this type of serial connection type blower, a plurality of first and second lead wires are respectively disposed in first and second webs through which a plurality of lead wires pass, Both single axial flow fans are connected by relatively rotating the second single axial flow fan.
JP 2004-278371 A

  However, in the conventional serial connection type blower, the end faces of the pair of side walls of the first web 102 through which the plurality of lead wires pass are located in one imaginary plane extending in the direction perpendicular to the axis. Further, the end surfaces of the pair of side walls of the second web 103 through which the plurality of lead wires pass are also located in one imaginary plane extending in a direction orthogonal to the axis. Therefore, as shown in FIG. 9, when a part 101 of the plurality of first and second lead wires protrudes from the first and second webs 102 and 103, the first single axial flow fan and the second single piece When connecting both single axial fans by relatively rotating the axial fan, the protruding lead wire 101 is between the two side walls facing the axial direction of the first and second webs 102, 103. There is a case in which there is a problem that the bite is not caught in the first and second webs 102 and 103.

  An object of the present invention is to connect a single vane with a single lead wire when the first single axial fan and the second single axial fan are relatively rotated to connect the single axial fan. An object of the present invention is to provide a serial connection type air blower capable of preventing being caught in the side wall portions of the first and second webs constituting the above and being prevented from being stored in the first and second webs.

  The serial connection type blower to be improved by the present invention includes a first single axial fan and a second single axial fan. A first single axial flow blower includes a first housing having a wind tunnel having a suction side opening and a discharge side opening, a first impeller having a plurality of blades rotating in the wind tunnel, A first motor for rotating the first impeller, a first motor support for supporting the stator of the first motor located in the discharge-side opening, and a discharge-side opening And N (N is an integer of 3 or more) first webs that are arranged at predetermined intervals in the rotation direction of the first impeller and connect the first housing and the first motor support portion; And a plurality of first lead wires extending from lead wire lead holes provided in the first motor support portion. One first web is formed with a first lead wire guide groove that communicates with the lead wire lead hole and through which the plurality of first lead wires pass. The first housing is formed with a first lead wire drawing groove that communicates with the first lead wire guide groove and draws the plurality of first lead wires to the outside of the first housing. A second single axial fan includes a second housing having a wind tunnel having a suction side opening and a discharge side opening, a second impeller having a plurality of blades rotating in the wind tunnel, A second motor arranged to rotate the second impeller, a second motor support that is located in the suction side opening and supports the stator of the second motor, and is located in the suction side opening N second webs arranged at a predetermined interval in the rotation direction of the second impeller and connecting the second housing and the second motor support, and provided on the second motor support And a plurality of second lead wires extending from the formed second lead wire lead-out holes. One second web is formed with a second lead wire guide groove that communicates with the second lead wire lead hole and through which the plurality of second lead wires pass. The second housing is formed with a second lead wire drawing groove that communicates with the second lead wire guide groove and draws a plurality of second lead wires to the outside of the second housing. And in the 2nd housing of the 2nd single axial flow fan, the plurality of engaged parts provided in the end surrounding the circumference of the discharge side opening in the 1st housing of the 1st single axial flow fan The first single axial fan and the second single shaft are engaged with a plurality of engaging portions that are provided at an end portion surrounding the suction side opening and engage with a plurality of engaged portions. A current blower is connected in series. In addition, the first single axial flow fan is configured such that the plurality of engaged portions and the plurality of engaging portions match the respective axes of the first single axial flow fan and the second single axial flow fan. And it has the structure which will be in an engagement state by rotating a 2nd single-axis | shaft axial flow fan relatively by a predetermined angle centering on an axis. The N first webs and the N second webs are aligned with the first single axial fan and the second single axial fan to form N stationary blades. As such, each shape is defined. Then, the first web through which the plurality of first lead wires passes and the second web through which the plurality of second lead wires pass form a single stationary blade. In the present invention, the first web through which the plurality of first lead wires passes is formed integrally with the bottom wall portion constituting the bottom portion of the first lead wire guide groove and the bottom wall portion. And a pair of side wall portions located on both sides of the line guide groove. The second web through which the plurality of second lead wires passes is formed integrally with the bottom wall portion constituting the bottom portion of the second lead wire guide groove, and the second wall guide portion. And a pair of side wall portions located on both sides of the groove. Of the pair of side walls of the first web and the second web through which the plurality of lead wires pass, the first single axial fan and the second single axial fan are relatively rotated. The height of the side wall portion located on the front side in the relative rotation direction is lower than the side wall portion located on the rear side in the relative rotation direction. In the present specification, the “relative rotation direction” refers to the pair of side walls of the first web through which a plurality of lead wires pass. This is the direction of rotation when rotating with respect to the blower, and the second single axial fan is changed to the first single axial fan when the pair of side walls of the second web through which the plurality of lead wires pass is viewed. It is a rotation direction in the case of rotating with respect to it. Further, in the present specification, “relatively rotating” means that when the first single axial fan and the second single axial fan are rotated relative to each other, the first single axial fan and second This includes both cases where one single axial flow fan of the single axial flow blower is fixed and the other single axial flow blower is rotated with respect to one single axial flow blower.

  As in the present invention, the height from the bottom wall portion of the side wall portion located on the front side in the rotation direction is lower than the height from the bottom wall portion of the side wall portion located on the rear side in the relative rotation direction. Then, the height from the bottom wall part of the two side wall parts located in the back side of the relative rotation direction of each of the first and second webs through which the plurality of lead wires passes is increased. As a result, in the initial state where relative rotation is started, between the end surface of the side wall portion on the front side of one of the first and second webs and the end surface of the side wall portion on the front side of the other web. The space formed is increased. In addition, since the height of the rear side wall portion is higher than the front side wall portion, there is no possibility that the lead wire crosses the rear side wall portion and moves to the rear side, and a plurality of leads are passed through the large space described above. The wire can be moved into the lead wire guide groove of the mating web. As a result, when the first single axial flow fan and the second single axial flow fan are relatively rotated to connect the two single axial flow fans, the first web 1 passes through the plurality of lead wires. A lead wire is prevented from being caught between one side wall portion and one side wall portion of the second web, or a part of the lead wires is prevented from being stored in the combined first and second webs. be able to.

  The first impeller and the second impeller may rotate in the same direction or in opposite directions.

  According to the present invention, when the first single axial flow fan and the second single axial flow fan are relatively rotated to connect both the single axial flow fans, the lead wires are connected to the first and second lead wires. The first single axial flow blower and the second airflow fan are securely inserted into the lead wire guide grooves of the first web and the second web without being sandwiched between the two side wall portions of the web. The single axial flow fan can be combined.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a serially connected blower according to an embodiment of the present invention in which the present invention is applied to a counter-rotating axial flow blower. As shown in FIG. 1, the serial connection type blower of this example has a structure in which a first single axial flow fan 1 and a second single axial flow blower 3 are connected in series via an engagement structure. is doing. The first single axial fan 1 includes a first case 5, a first impeller 7 and a first motor 9 disposed in the first case 5. The first impeller 7 includes a cup-shaped member 11 fixed to the rotor 9 b of the first motor 9, and five blades 13 provided integrally on the outer peripheral surface of the annular peripheral wall 11 a of the cup-shaped member 11. And have. The first motor 9 has a known structure disclosed in Japanese Patent Application Laid-Open No. 2008-17607, Japanese Patent No. 3904595, and the like. The first motor 9 has a stator 9a, a rotor 9b, and a rotating shaft 9c fixed to the rotor 9b, but detailed description of each member is omitted. The first motor 9 rotates the first impeller 7 counterclockwise when viewed from the left side of FIG. In this example, the first motor 9 rotates the first impeller 7 at a speed faster than the rotational speed of the second impeller 49 described later.

  As shown in detail in FIG. 2, the first case 5 includes a first housing 15, a first motor support portion 17, and N (N is an integer of 3 or more: 4 in this example) first Webs 19, 21, 23, 25. 2 shows that the first single axial flow fan 1 and the second single axial flow fan 3 of the serial connection type blower shown in FIG. It is the perspective view which looked at the case 5 of this from the junction part side with the 2nd single axial fan 3. The first housing 15 has an annular suction side flange 27 on one side in the direction (axial direction) in which the axis A of the rotating shaft 9c of the first motor 9 extends, and an annular discharge side on the other side in the axial direction. A flange 29 is provided. A cylindrical portion 31 is formed between the flanges 27 and 29.

  The suction side flange 27 has a substantially square outline shape, and has an octagonal suction side opening 33 inside (see FIG. 1). At the four corners of the suction side flange 27, through-holes 27a through which mounting screws (not shown) pass are formed.

  The discharge side flange 29 also has a substantially square outline shape, and has a circular discharge side opening 35 inside. In this example, a wind tunnel having a suction side opening 33 and a discharge side opening 35 is configured by the internal space of the suction side flange 27, the cylindrical portion 31, and the discharge side flange 29. The discharge side flange 29 has four corners 29a to 29d. In the vicinity of the corner portion 29d, a first lead wire lead groove 29e is formed to lead out a plurality of first lead wires for driving the first motor 9 to the outside of the first housing 15. The discharge side flange 29 (the end portion surrounding the discharge side opening 35 in the first housing 15) is used for engagement for connecting the first and second single axial flow fans 1, 3 4. One first fitting groove 37 and three second fitting grooves 39 are formed. The four first fitting grooves 37 are respectively formed in the four corners 29 a to 29 d of the discharge side flange 29, and are constituted by through holes that penetrate the discharge side flange 29. The first fitting groove 37 formed in the corner portion 29a will be described with reference numerals. The first fitting groove 37 has a hook passage hole 37a and a hook movement hole 37b continuous to the hook passage hole 37a. is doing. The hook passage hole 37a has a semicircular arc-shaped portion 37c, and also serves as a through hole through which a mounting screw passes. The hook movement hole 37b has an arc shape.

  The three second fitting grooves 39 are respectively formed in the three corner portions 29a, 29b, and 29c excluding the corner portion 29d adjacent to the first lead wire lead-out groove 29e. As shown in FIG. 2 and FIG. 3, which is a sectional view taken along the line III-III of FIG. 2, the second fitting groove 39 has a protrusion moving groove 39a and an engaging groove 39b continuous to the protrusion moving groove 39a. is doing. The protrusion moving groove 39 a has an opening 39 c that opens on the side surface of the discharge-side flange 29. The bottom surface 39d of the protrusion moving groove 39a is inclined so as to approach the second single axial fan 3 as it goes from the opening 39c to the engaging groove 39b. Thereby, a step is formed between the engaging groove 39b and the protrusion moving groove 39a.

  The first motor support portion 17 is located in the discharge-side opening 35 and supports the stator 9a of the first motor 9. The first motor support portion 17 is formed from the disk-shaped bottom wall portion 17a and the bottom wall portion 17a. And a cylindrical side wall portion 17b that rises toward the impeller 7 side. In part of the bottom wall portion 17a and the side wall portion 17b, lead wire lead holes 17c from which a plurality of first lead wires are drawn are formed.

  The four first webs 19, 21, 23, 25 are located in the discharge-side opening 35 and arranged at a predetermined interval in the rotation direction of the first impeller 7, so that the first housing 15 And the side wall portion 17b of the first motor support portion 17 are connected. The four first webs 19, 21, 23, 25 are four second webs 59 to be described later in a state where the first single axial fan 1 and the second single axial fan 3 are connected. , 61, 63, and 65, the shapes of the four stationary blades 87, 89, 91, and 93 (see FIG. 7) are determined. As shown in FIG. 4, which is a partially enlarged view of FIG. 2 from another angle, one of the four first webs 19, 21, 23, 25 has a first A first lead wire guide groove 19a through which a plurality of first lead wires used for driving the motor 9 passes is formed. The first lead wire guide groove 19 a communicates with the lead wire lead hole 17 c of the first motor support portion 17 and the first lead wire lead groove 29 e of the first housing 15. The first web 19 is formed integrally with the bottom wall portion 41 constituting the bottom portion of the first lead wire guide groove 19a and the bottom wall portion 41, and is located on both sides of the first lead wire guide groove 19a. A pair of side wall portions 43 and 45 are provided. Of the pair of side wall portions 43, 45, the first single axial fan 1 and the second single axial fan 3 as described later are positioned on the front side in the relative rotation direction when relatively rotating. The one side wall 43 is lower in height from the bottom wall 41 than the other side wall 45 located on the rear side in the relative rotation direction. In this example, one side wall part 43 has the flat surface 43a which opposes the 2nd single axial flow fan 3, and the two inclined surfaces 43b and 43c located in the both ends of the flat surface 43a. The inclined surface 43b is located between the first motor support portion 17 and the flat surface 43a, and is inclined so as to approach the bottom wall portion 41 from the first motor support portion 17 toward the flat surface 43a. is doing. The inclined surface 43 c is located between the flat surface 43 a and the discharge side flange 29, and is inclined so as to be separated from the bottom wall portion 41 as it goes from the flat surface 43 a to the discharge side flange 29. The other side wall 45 has a flat surface 45a facing the second single axial fan 3 and two inclined surfaces 45b and 45c located at both ends of the flat surface 45a. The inclined surface 45b is located between the first motor support portion 17 and the flat surface 45a, and is inclined so as to move away from the bottom wall portion 41 as it goes from the first motor support portion 17 toward the flat surface 45a. is doing. The inclined surface 45 c is located between the flat surface 45 a and the discharge side flange 29, and is inclined so as to approach the bottom wall portion 41 as it goes from the flat surface 45 a to the discharge side flange 29. A mode in which the first single axial flow fan 1 and the second single axial flow fan 3 are relatively rotated and connected to each other will be described in detail later.

  Referring back to FIG. 1, the second single axial fan 3 has a second case 47, a second impeller 49 and a second motor 51 arranged in the second case 47. ing. The second impeller 49 includes a cup-shaped member 53 fixed to the rotor 51 b of the second motor 51 and four blades 56 integrally provided on the outer peripheral surface of the annular peripheral wall 53 a of the cup-shaped member 53. And have. Similarly to the first motor 9, the second motor 51 also has a known structure disclosed in Japanese Patent Application Laid-Open No. 2008-17607, Japanese Patent No. 3904595, and the like. The second motor 51 includes a stator 51a, a rotor 51b, and a rotating shaft 51c fixed to the rotor 51b, but detailed description of each member is omitted. The second motor 51 rotates the second impeller 49 in the clockwise direction when viewed from the left side of FIG. That is, the second impeller 49 is rotated in the direction opposite to the rotation direction of the first impeller 7. As described above, the second impeller 49 is rotated at a speed slower than the rotational speed of the first impeller 7.

  As shown in detail in FIG. 5, the second case 47 includes the second housing 55, the second motor support 57, and N (N is an integer of 3 or more: 4 in this example) second Web 59, 61, 63, 65. 5 shows that the first single axial flow fan 1 and the second single axial flow fan 3 of the serial connection type blower shown in FIG. It is the perspective view which looked at the case 47 of this from the junction part side with the 1st single axial flow fan 1. FIG. The second housing 55 has an annular suction side flange 67 on one side in the direction (axial direction) in which the axis A of the rotating shaft 51c of the second motor 51 extends, and an annular discharge side on the other side in the axial direction. A flange 69 is provided. A cylindrical portion 71 is formed between the flanges 67 and 69.

  The suction side flange 67 has a substantially square outline shape, and has a circular suction side opening 73 inside. The four corners 67a to 67d of the suction side flange 67 are respectively formed with through holes 67e through which attachment screws (not shown) pass. In the vicinity of the corner portion 67d of the suction side flange 67, a second lead wire drawing groove 67f is formed for drawing out a plurality of second lead wires for driving the second motor 51 to the outside of the second housing 55. . The suction side flange 67 (the end portion surrounding the suction side opening 73 in the second housing 55) is used for engagement for connecting the first and second single axial flow fans 1 and 3 4. One hook 75 and three protrusions 77 are integrally formed. The four hooks 75 are respectively provided at the four corners 67 a to 67 d of the suction side flange 67. The hook 75 formed on the corner portion 67a will be described with reference numerals. The hook 75 includes a trunk portion 75a that rises from the corner portion along the axis A, and a head portion 75b that is integrally attached to the tip of the trunk portion 75a. And have. The head 75b protrudes from the tip of the body 75a toward the outside in the radial direction. Thereby, a level | step difference is formed between the head 75b and the trunk | drum 75a.

  The protrusion 77 is provided at a position where the through hole 67e is sandwiched between the hook 75 at the three corners 67a, 67b, and 67c excluding the corner 67d adjacent to the second lead wire drawing groove 67f. Similar to the hook 75, the projection 77 protrudes toward the first case 5. The protrusion 77 has an inclined surface 77 a that inclines so as to approach the first case 5 as it moves away from the hook 75 located at the same corner. The inclined surface 77a slides on the bottom surface 39d of the protrusion moving groove 39a shown in FIG. The protrusion 77 has an end surface 77b extending in the axial direction from the tip of the inclined surface 77a toward the second case 47 side. The end surface 77b engages with the inner surface of the engagement groove 39b. In this example, a plurality of engaged portions are constituted by the first fitting groove 37 and the second fitting groove 39, and a plurality of engaging portions are constituted by the hook 75 and the protrusion 77.

  The discharge side flange 69 has a substantially square outline shape, and has an octagonal discharge side opening 79 inside (see FIG. 1). Further, through holes 69 a through which mounting screws pass are formed in the four corners of the discharge-side flange 69, respectively. In this example, a wind tunnel having a suction side opening 73 and a discharge side opening 79 is constituted by the internal space of the suction side flange 67, the cylindrical portion 71, and the discharge side flange 69.

  The second motor support portion 57 is located in the suction side opening 73 and supports the stator 51a of the second motor 51. The second motor support portion 57 is formed from the disc-shaped bottom wall portion 57a and the bottom wall portion 57a. And a cylindrical side wall portion 57b rising to the impeller 49 side. In part of the bottom wall portion 57a and the side wall portion 57b, lead wire drawing holes 57c from which a plurality of second lead wires are drawn are formed.

  The four second webs 59, 61, 63, 65 are located in the suction side opening 73 and arranged at a predetermined interval in the rotation direction of the second impeller 49, so that the second housing 55. Are connected to the side wall portion 57b of the second motor support portion 57. As shown in FIG. 6 which is a partially enlarged view of FIG. 5 seen from another angle, one of the four second webs 59, 61, 63 and 65 has a second web 59. A second lead wire guide groove 59a through which a plurality of second lead wires for driving the motor 51 is passed is formed. The second lead wire guide groove 59 a communicates with the lead wire lead hole 57 c of the second motor support portion 57 and the second lead wire lead groove 67 f of the second housing 55. The second web 59 is formed integrally with the bottom wall portion 81 constituting the bottom portion of the second lead wire guide groove 59a, and is located on both sides of the second lead wire guide groove 59a. A pair of side wall portions 83 and 85 are provided. Of the pair of side wall portions 83 and 85, the first single axial fan 1 and the second single axial fan 3 as described later are positioned on the front side in the relative rotation direction when relatively rotating. The one side wall 83 is lower in height from the bottom wall 81 than the other side wall 85 located on the rear side in the relative rotation direction. In this example, one side wall 83 has a flat surface 83a facing the first single axial flow fan 1 and two inclined surfaces 83b and 83c located at both ends of the flat surface 83a. The inclined surface 83b is located between the second motor support portion 57 and the flat surface 83a, and is inclined so as to approach the bottom wall portion 81 from the second motor support portion 57 toward the flat surface 83a. is doing. The inclined surface 83 c is located between the flat surface 83 a and the suction side flange 67, and is inclined so as to be separated from the bottom wall portion 81 toward the suction side flange 67 from the flat surface 83 a. The other side wall 85 has a flat surface 85a facing the first single axial fan 1 and two inclined surfaces 85b and 85c located at both ends of the flat surface 85a. The inclined surface 85b is located between the second motor support portion 57 and the flat surface 85a, and is inclined so as to move away from the bottom wall portion 81 from the second motor support portion 57 toward the flat surface 85a. is doing. The inclined surface 85 c is located between the flat surface 85 a and the suction side flange 67, and is inclined so as to approach the bottom wall portion 81 from the flat surface 85 a toward the suction side flange 67.

  In the blower of this example, the first case 5 of the first single axial fan 1 and the second case 47 of the second single axial fan 3 are combined as follows. First, as shown in a partially broken view of FIG. 7A, the end of the first case 5 and the end of the second case 47 are brought close to each other, and the four hooks 75 of the second case 47 are placed. Are inserted into the hook passage holes 37a of the four first fitting grooves 37 of the first case 5, respectively. At this time, the three protrusions 77 of the second case 47 enter the openings 39c of the three second fitting grooves 39 of the first case 5, and the first single axial fan 1 and the second single shaft The axial lines of the air blower 3 coincide with each other. In practice, when the first case 5 and the second case 47 are combined, an impeller and a motor are arranged in the case. However, in FIG. 7, the impeller and the motor are omitted for easy understanding. Further, the first and second lead wires arranged in the first and second webs 19 and 59 are also omitted.

  Next, with the first case 5 of the first single axial flow fan 1 and the second case 47 of the second single axial flow fan 3 aligned with the respective axes A, the first case 5 Then, the second case 47 is relatively rotated about the axis A by a predetermined angle. Specifically, the first case 5 is rotated in the clockwise direction (arrow D1) toward the second case 47, and the second case 47 is rotated clockwise toward the first case 5. In the direction (arrow D2). FIG. 7B is a perspective view after rotation. In this rotation, both cases may be rotated with each other, or one case may be fixed and the other case may be rotated with respect to the one case. By this rotation, the body 75 a of the hook 75 moves in the hook moving hole 37 b of the first fitting groove 37, and the step between the head 75 b of the hook 75 and the body 75 a becomes the discharge side flange 29. And the hook 75 is prevented from coming off from the first fitting groove 37. Further, the protrusion 77 moves in the protrusion moving groove 39a of the second fitting groove 39 and is fitted in the engaging groove 39b (see FIG. 3). Also, the four first webs 19, 21, 23, 25 and the four second webs 59, 61, 63, 65 are aligned to form four stationary blades 87, 89, 91, 93, respectively. It is configured (the vane 89 is not shown, but the reference numeral is described in the specification for convenience). In the first web 19 and the second web 59 in which lead wires are disposed, the flat surface 43 a of one side wall 43 of the first web 19 and the other side wall 85 of the second web 59 are arranged. The flat surface 85a faces, and the inclined surfaces 43b, 43c of one side wall 43 of the first web 19 and the inclined surfaces 85b, 85c of the other side wall 85 of the second web 59 face each other. Further, the flat surface 45a of the other side wall 45 of the first web 19 and the flat surface 83a of the one side wall 83 of the second web 59 face each other, and the other side wall 45 of the first web 19 The inclined surfaces 45b and 45c and the inclined surfaces 83b and 83c of one side wall 83 of the second web 59 face each other (see FIGS. 4 and 6).

  In the serial connection type blower of this example, as shown in FIG. 1, the first impeller 7 rotates in one direction, and the second impeller 49 rotates in the other direction opposite to the first impeller 7. Then, as shown by an arrow F, the air is blown from the suction side opening 33 of the first housing 15 to the discharge side opening 79 of the second housing 55.

  Moreover, in the serial connection type air blower of this example, as shown in FIG. 8, among the pair of side wall portions 43 and 45 of the first web 19, the first single axial flow fan 1 and the second single axial flow are provided. The side wall portion 43 located on the front side in the relative rotation direction (arrow D1) when the blower 3 is relatively rotated is more than the side wall portion 45 located on the rear side in the relative rotation direction (arrow D1). Also, the height from the bottom wall portion 41 is low. Further, of the pair of side wall portions 83 and 85 of the second web 59, the relative rotation direction when the first single axial fan 1 and the second single axial fan 3 are relatively rotated ( The side wall 83 located on the front side of the arrow D2) has a lower height from the bottom wall 81 than the side wall 85 located on the rear side in the relative rotation direction (arrow D2). Therefore, the distance L1 (space) between the side wall 43 of the first web 19 and the side wall 83 of the second web 59 is longer than the distance L101 of the conventional blower shown in FIG. Become). Further, the height from the bottom wall portion 41 of the side wall portion 45 is higher than that of the conventional portion by the amount 45d of the side wall portion 45 of the first web 19, and the height of the portion 85d of the side wall portion 85 of the second web 59 is increased. Since the height of the side wall 85 from the bottom wall 81 is higher than that of the prior art, there is no possibility that the lead wire gets over the side walls 45 and 85 on the rear side and moves to the rear side. In addition, the plurality of lead wires can be moved into the lead wire guide groove of the mating web through the large space described above. As a result, when the first single axial flow fan 1 and the second single axial flow fan 3 are relatively rotated to connect both single axial flow fans, the first web through which the plurality of lead wires pass is provided. A lead wire is inserted between one side wall portion of 19 and one side wall portion of the second web 59, or some of the lead wires are inserted into the combined first and second webs 19 and 59. It can be prevented from being stored.

It is sectional drawing of the serial connection type air blower of embodiment of this invention. It is a perspective view of the 1st case of the serial connection type air blower shown in FIG. It is the III-III sectional view taken on the line of FIG. It is the elements on larger scale which looked at FIG. 2 from another angle. It is a perspective view of the 2nd case of the serial connection type air blower shown in FIG. It is the elements on larger scale which looked at FIG. 5 from another angle. (A) and (B) are the serial connection type air blowers shown in FIG. 1, wherein the first case of the first single axial flow fan and the second case of the second single axial flow fan are combined. It is a figure used in order to explain. (A)-(C) are figures which show the aspect which a 1st web and a 2nd web join in the serial connection type air blower shown in FIG. (A)-(C) are figures which show the aspect which a 1st web and a 2nd web join in the conventional serial connection type air blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st single axial flow fan 3 2nd single axial flow fan 7 1st impeller 9 1st motor 15 1st housing 17 1st motor support part 17c Lead wire extraction hole 19, 21, 23, 25 1st web 19a 1st lead wire guide groove 29e 1st lead wire extraction groove 37 1st fitting groove 39 2nd fitting groove 41 Bottom wall part 43,45 Side wall part 49 2nd impeller 51 1st Second motor 55 Second housing 57 Second motor support portion 57c Lead wire lead-out holes 59, 61, 63, 65 Second web 59a Second lead wire guide groove 67f Second lead wire lead-out groove 75 Hook 77 Protrusion 81 Bottom wall 83, 85 Side wall 87, 89, 91, 93

Claims (2)

A first housing having a wind tunnel having a suction-side opening and a discharge-side opening, a first impeller having a plurality of blades rotating in the wind tunnel, and the first housing disposed in the wind tunnel A first motor that rotates the impeller, a first motor support that is located in the discharge side opening and supports the stator of the first motor, and is located in the discharge side opening and the first N (N is an integer of 3 or more) first webs arranged at a predetermined interval in the rotational direction of one impeller and connecting the first housing and the first motor support; And a plurality of first lead wires extending from lead wire lead holes provided in the first motor support portion, wherein one of the first webs communicates with the lead wire lead holes and A plurality of first leads A first lead wire guide groove is formed, and the first housing communicates with the first lead wire guide groove so that the plurality of first lead wires are disposed outside the first housing. A first single axial blower in which a first lead wire pull-out groove is formed;
A second housing having a wind tunnel having a suction side opening and a discharge side opening, a second impeller having a plurality of blades rotating in the wind tunnel, and the second housing disposed in the wind tunnel A second motor that rotates the impeller, a second motor support that is located in the suction side opening and supports the stator of the second motor, and is located in the suction side opening and the second N second webs arranged at a predetermined interval in the rotation direction of the two impellers to connect the second housing and the second motor support, and the second motor support A plurality of second lead wires extending from the provided second lead wire lead-out holes, and the second web communicates with the second lead wire lead-out holes in the plurality of second lead wires. The second lead passes through Lead wire guide grooves are formed, and the second housing communicates with the second lead wire guide grooves and draws the plurality of second lead wires to the outside of the second housing. A second single axial flow fan in which a lead wire lead-out groove is formed,
A plurality of engaged portions provided at an end portion surrounding the discharge side opening in the first housing of the first single axial fan, and the second of the second single axial fan. The first single axial flow blower is engaged with a plurality of engaging portions that are provided at an end portion of the housing surrounding the suction side opening and engage with the plurality of engaged portions. And the second single axial fan are connected in series,
The plurality of engaged portions and the plurality of engaging portions are configured so that the first single unit axial flow blower and the second single unit axial flow blower have their axes aligned with each other. The axial flow fan and the second single axial flow fan have a structure that is brought into an engaged state by being relatively rotated by a predetermined angle around the axis,
The N first webs and the N second webs are aligned in a state where the first single axial fan and the second single axial fan are connected to each other. Each shape is determined so as to constitute a stationary blade,
The serial connection type blower in which the first web through which the plurality of first lead wires pass and the second web through which the plurality of second lead wires pass are configured to constitute one stationary blade. Because
The first web through which the plurality of first lead wires passes is formed integrally with the bottom wall portion constituting the bottom portion of the first lead wire guide groove and the bottom wall portion, and the first lead. A pair of side wall portions located on both sides of the line guide groove,
The second web through which the plurality of second lead wires pass is formed integrally with the bottom wall portion constituting the bottom portion of the second lead wire guide groove and the bottom wall portion, and the second lead. A pair of side wall portions located on both sides of the line guide groove,
Of the pair of side walls of each of the first web and the second web, the relative rotation when the first single axial fan and the second single axial fan are relatively rotated. The serial connection type blower characterized in that the side wall portion located on the front side in the moving direction has a lower height from the bottom wall portion than the side wall portion located on the rear side in the relative rotation direction. .   The serial connection type blower according to claim 1, wherein the first impeller and the second impeller rotate in opposite directions.

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