JP2008267375A - Counter-rotating axial-flow fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a counter-rotating axial-flow fan capable of preventing first and second divided housing units from being damaged when joining the first and second divided housing units. <P>SOLUTION: Engaging members 23A-23D and first stopper parts 25A-25D are integrally formed with a first flange part 19 of the first divided housing unit 11. The first stopper parts 25A-25D are arranged adjacent to the engaging members 23A-23D. Engaged members 41A-41D and second stopper parts 43A-43D are integrally formed with a second flange part 37 of the second divided housing unit 13. The second stopper parts 43A-43D are arranged adjacent to the engaged members 41A-41D, and have leading ends abutted onto leading ends of the first stopper parts 25A-25D in a state of completely engaging the engaging members 23A-23D with the engaged members 41A-41D. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a counter-rotating axial flow fan used for cooling the inside of an electric device.

Japanese Patent No. 3904595 (Patent Document 1) discloses a housing main body having a wind tunnel having a suction port on one side in the axial direction and a discharge port on the other side in the axial direction, and a motor disposed at the center of the wind tunnel. A counter-rotating axial fan with a housing with a support frame is shown. In this counter-rotating axial flow fan, a first impeller rotated by a first motor is disposed in a first space between a motor support frame and a suction port in the housing. A second impeller that is rotated by the second motor is disposed in a second space between the motor support frame and the discharge port in the housing. The first impeller rotates in the opposite direction to the second impeller. In this counter-rotating axial flow fan, the housing is constituted by first and second divided housing units connected by a coupling structure. The first split housing unit includes a first housing main body half having a first cylindrical wind tunnel half having a main portion of the first space therein, and a radial direction in which the motor support frame is orthogonal to the axial direction. And a first support frame half obtained by being divided into two along a virtual reference dividing plane extending in the direction. The second split housing unit includes a second housing body half having a second cylindrical wind tunnel half having a main portion of the second space therein, and a motor support frame along a virtual reference split plane. And a second support frame half obtained by dividing into two. The coupling structure includes a fitting portion formed at the other end of the first cylindrical wind tunnel half and a fitted portion formed at the other end of the second cylindrical wind tunnel half and fitted with the fitting portion. It consists of and.
Japanese Patent No. 3904595

  However, in the conventional counter-rotating axial flow fan, when the first and second split housing units are combined, the fitting portion of the first cylindrical wind tunnel half and the second cylindrical wind tunnel half are covered. When the fitting portion is pressed strongly, an excessive force is applied to the fitting portions of the first and second divided housing units, and the first and second divided housing units may be damaged.

  Further, in the conventional counter-rotating axial flow fan, since the strength of the coupling portion with the first and second divided housing units is low, when a force is applied from the outside, the first and second divided housing units are There was a problem that was easy to come off. Therefore, it was necessary to use screwing or bonding. An object of the present invention is to provide a counter-rotating axial flow fan that can prevent the first and second split housing units from being damaged when the first and second split housing units are joined. There is.

  Another object of the present invention is to provide a counter-rotating axial flow fan capable of preventing the first and second divided housing units from being easily detached even when a force is applied from the outside.

  The counter-rotating axial flow fan of the present invention includes a housing, a first impeller and a first motor, and a second impeller and a second motor. The housing includes a housing main body having a wind tunnel having a suction port on one side in the axial direction and a discharge port on the other side in the axial direction, and a motor support frame disposed at the center of the wind tunnel. The first impeller includes a plurality of blades disposed in a first space between the motor support frame and the suction port in the housing. The first motor includes a first rotation shaft to which the first impeller is fixed, and rotates the first impeller in the first rotation direction in the first space. The second impeller is disposed in a second space between the motor support frame and the discharge port in the housing, and includes a plurality of blades. The second motor includes a second rotation shaft to which the second impeller is fixed, and rotates the second impeller in a second rotation direction opposite to the first rotation direction in the second space. Let

  The motor support frame is disposed at a predetermined interval in the circumferential direction of the rotation shaft between the support frame main body located at the center of the wind tunnel and the support frame main body and the housing main body. And a plurality of webs connecting the two.

  The housing is constituted by first and second divided housing units connected by a coupling structure. The first split housing unit has a first flange portion having a suction port at one end, and a first tubular shape in which one end is integrally formed with the first flange portion and has a main portion of the first space inside. A first housing body half having a wind tunnel half and a first support frame half obtained by dividing the motor support frame into two along a virtual reference dividing plane extending in a radial direction perpendicular to the axial direction. Part. The second divided housing unit includes a second flange portion having a discharge port at one end, and a second tube having one end formed integrally with the second flange portion and having a main portion of the second space inside. A second half of the housing main body provided with a half-shaped wind tunnel half, and a second half of the support frame obtained by dividing the motor support frame into two along the virtual reference dividing plane.

  The coupling structure employed in the present invention is formed at the other end of the first cylindrical wind tunnel half and at the other end of the second cylindrical wind tunnel half and is fitted with the fitting part. A plurality of engaging members formed integrally with the first flange portion, spaced apart in the circumferential direction and extending along the first cylindrical wind tunnel half, A plurality of engaged members that are integrally formed with the flange portion, are arranged at intervals in the circumferential direction, extend along the second cylindrical wind tunnel half, and engage with the plurality of engaging members. ing.

  A plurality of first stopper portions formed integrally with the first flange portion, disposed adjacent to the engaging member and extending along the first cylindrical wind tunnel half, and a second flange portion. Is formed adjacent to the engaged member, extends along the second cylindrical wind tunnel half, and the plurality of engaging members and the plurality of engaged members are completely engaged, A plurality of second stopper portions having tip portions that abut against the tip portions of the plurality of first stopper portions.

  In the present invention, the coupling structure for coupling the first and second divided housing units has a plurality of engaging members formed integrally with the first flange portion and a plurality formed integrally with the second flange portion. The engaged member is used. Therefore, according to the present invention, in addition to the fitting structure formed by fitting the fitting portion of the first cylindrical wind tunnel half and the fitted portion of the second cylindrical wind tunnel half, The coupling of the first and second divided housing units is also achieved by the engagement structure of the engagement member and the plurality of engaged members. As a result, the force does not concentrate on the fitting structure of the first and second cylindrical wind tunnel halves, and the first and second divided housing units do not easily come off. . Furthermore, in the present invention, the plurality of first stopper portions are provided adjacent to the engaging member, and the plurality of second stopper portions are provided adjacent to the engaged member. Even when a force is applied to the engaging member and the engaged member from the first and second flange portions when the second divided housing unit is coupled, the engaging member and the engaged member The tip portions of the plurality of first stopper portions adjacent to each other and the tip portions of the plurality of second stopper portions abut against each other. As a result, even if the plurality of engaging members are strongly pressed against the plurality of engaged members, it is possible to prevent the engaging members or the engaging portions of the engaged members from being damaged.

  In the case where the first flange portion and the second flange portion each have a contour shape having four corners that are arranged in the circumferential direction, the four engaging members and the four Preferably, one stopper portion is disposed in the vicinity of the four corners of the first flange portion, and four engaged members and four second stopper portions are respectively disposed in the vicinity of the four corners of the second flange portion. Then, two engaging members are arranged in the region between the first corner and the second corner of the first flange portion, and in the region between the second corner and the third corner. Two first stopper portions are arranged, two engaging members are arranged in a region between the third corner and the fourth corner, and between the fourth corner and the first corner. Two first stopper portions are arranged in the region. Further, two engaged members are arranged in the region between the first corner and the second corner of the second flange portion, and in the region between the second corner and the third corner. Arranges two second stopper portions, arranges two engaged members in a region between the third corner and the fourth corner, and arranges the fourth corner and the first corner. It is preferable to arrange two second stopper portions in the region between them. In this way, since the four corners of the first and second flange portions can easily secure a space, the four engaging members, the four engaged members, and the four first and second stopper portions are surrounded. Can be arranged side by side in the direction. In particular, the first and second stopper portions are positioned outside the engaging member and the engaged member. Therefore, even when the force applied to the four corners of the first and second flange portions becomes excessive, the first and second stopper portions positioned outside absorb the external force, and the engaging member and the engaged member It is possible to prevent an excessive force from being applied.

  Preferably, the plurality of engaging members are integrally coupled with the first cylindrical wind tunnel half, and the plurality of engaged members are integrally coupled with the second cylindrical wind tunnel half. If it does in this way, mechanical strength of a plurality of engaging members and a plurality of engaged members can be raised. Moreover, after engaging both, an engaging member and a to-be-engaged member play the role which reinforces the 1st and 2nd cylindrical wind tunnel half.

  The arrangement of the engaging member, the engaged member, and the first and second stopper portions may be as follows. That is, when the first virtual diagonal line connecting the two corners facing the radial direction of the rotation axis among the four corners of the first flange portion and the second virtual diagonal line connecting the remaining two corners are assumed, the engagement member And the first stopper member corresponding to the engaging member are arranged so as to sandwich the first or second virtual diagonal line therebetween. Further, neither the engaging member nor the first stopper member is disposed at the four corners through which the first or second virtual diagonal passes. Furthermore, when the third virtual diagonal connecting the two corners facing the radial direction of the rotation axis among the four corners of the second flange portion and the fourth virtual diagonal connecting the remaining two corners are virtually assumed, The member and the second stopper member corresponding to the engaged member are arranged so as to sandwich the third or fourth virtual diagonal line therebetween. In addition, neither the engaged member nor the second stopper member is disposed in the four corner portions through which the third or fourth virtual diagonal passes. If it does in this way, when applying force to four corners of the 1st flange part and the 2nd flange part, and making a joint structure into a joint state, an engagement member, a member to be engaged, and the 1st and 2nd stoppers The force is applied to each part in a well-balanced manner, so that the engaging member and the engaged member can be reliably engaged, and the functions of the first and second stopper parts can be reliably exhibited.

  Various members can be adopted as the engaging member and the engaged member. For example, when one of the engaging member and the engaged member has a claw, the other of the engaging member and the engaged member has a hole with which the claw is engaged. can do. In this case, when the engaging member and the engaged member perform an operation of fitting the engaging member and the engaged member, at least one of the engaging member and the engaged member bends, What is necessary is just to comprise so that a nail | claw part and a hole part may be in an engagement state, when fitting with a to-be-engaged member is completed. And a hole part should just be formed so that an engagement state can be confirmed visually with the nail | claw part engaged with the hole. If it does in this way, an engagement member can be easily engaged with a to-be-engaged member only by elastically inserting a claw part into a hole. Further, since the hole portion is formed so that the engagement state can be visually confirmed in a state in which the claw portion is engaged with the hole portion, the engagement state between the engagement member and the engaged member is determined. It can be easily confirmed.

  The plurality of engaging members and the plurality of first stopper members do not protrude outward from the outline of the first flange portion when the first flange portion is viewed from the first cylindrical wind tunnel half portion side. It is preferable to define their shapes. Further, the plurality of engaged members and the plurality of second stopper members protrude outward from the contour of the second flange portion when the second flange portion is viewed from the second cylindrical wind tunnel half side. It is preferable to define their shapes so that there is no. If it does in this way, even if it provides an engaging member, a to-be-engaged member, and the 1st and 2nd stopper part, it can suppress that the external shape of a counter-rotating axial flow fan becomes large.

  According to the present invention, the coupling structure for coupling the first and second divided housing units is formed integrally with the plurality of engagement members formed integrally with the first flange portion and the second flange portion. And a plurality of engaged members. Therefore, in addition to the fitting structure formed by fitting the fitting portion of the first cylindrical wind tunnel half and the fitted portion of the second cylindrical wind tunnel half, a plurality of engagement members and a plurality of engagement members The first and second divided housing units can also be coupled by the engagement structure with the engaged member. As a result, the force does not concentrate on the fitting structure of the first and second cylindrical wind tunnel halves, and the first and second divided housing units do not easily come off. . Furthermore, in the present invention, the plurality of first stopper portions are provided adjacent to the engaging member, and the plurality of second stopper portions are provided adjacent to the engaged member. Even when a force is applied to the engaging member and the engaged member from the first and second flange portions when the second divided housing unit is coupled, the engaging member and the engaged member The tip portions of the plurality of first stopper portions adjacent to each other and the tip portions of the plurality of second stopper portions abut against each other. As a result, even when the plurality of engaging members are strongly pressed against the plurality of engaged members, there is an advantage that the engaging members or the engaging portions of the engaged members can be prevented from being damaged.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a half sectional view of a counter-rotating axial flow fan according to an embodiment of the present invention. As shown in the figure, the counter-rotating axial flow fan of this example includes a housing 1, a first motor 3, a first impeller 5, a second motor 7, and a second impeller 9. Yes. As shown in FIGS. 2 to 6, the housing 1 is configured by combining a first divided housing unit 11 and a second divided housing unit 13 via a coupling structure. 2 to 4 are a perspective view, a plan view, and a left side view of the housing 1, FIG. 5 is a partial cross-sectional view of FIG. 3 taken along line VV, and FIG. 4 is a sectional view taken along line VI-VI in FIG.

  The first divided housing unit 11 is made of synthetic resin or aluminum, and integrally includes a first housing body half 15 and a first support frame half 17 as shown in FIG. The first housing body half 15 includes a first flange 19, a first cylindrical wind tunnel half 21, four engagement members 23 </ b> A to 23 </ b> D, and four first stoppers 25 </ b> A to 25 </ b> D. ing. The first flange portion 19 is first to fourth aligned in the circumferential direction (hereinafter simply referred to as the circumferential direction) of rotating shafts 71 and 171 aligned on the same axis A of the first and second motors 3 and 7 described later. It has a substantially rectangular outline with four corners consisting of the corners 19a to 19d, and has a suction port 11a at one end in the axial direction to be described later. At the four corners of the first flange portion 19, rounded corners are respectively provided, and through holes 19 e into which fittings for attaching the counter-rotating axial flow fan to the electric device are inserted. One end of the first cylindrical wind tunnel half 21 is integrally formed with the first flange portion 19 and has a main portion of the first space S1 inside. The first cylindrical wind tunnel half 21 extends in the axial direction of the rotating shafts 71 and 171 (hereinafter simply referred to as the axial direction). The outer periphery of the other end 21a of the first cylindrical wind tunnel half 21 protrudes outward in the radial direction (hereinafter simply referred to as the radial direction) of the rotary shafts 71 and 171 at four equally spaced intervals in the circumferential direction. A wall portion 21b is formed. A flat surface portion 21c extending linearly to a position corresponding to the wall portion 21b is formed on the inner peripheral portion of the other end 21a of the first cylindrical wind tunnel half portion 21. In this Embodiment, the inner peripheral part of the other end 21a including the flat surface part 21c comprises the fitting part.

  As shown in FIGS. 3, 4, and 7, the four engaging members 23 </ b> A to 23 </ b> D are integrally formed with the first flange portion 19 and the first cylindrical wind tunnel half portion 21, and are spaced apart in the circumferential direction. It is arranged with a gap. The four engaging members 23A to 23D engage with four engaged members 41A to 41D of the second divided housing unit 13 described later, respectively. The four engaging members 23 </ b> A to 23 </ b> D are disposed in the vicinity of the four corners 19 a to 19 d of the first flange portion 19 in a state of being integrally coupled to the first cylindrical wind tunnel half 21. These four engaging members 23 </ b> A to 23 </ b> D do not protrude outward from the outline of the first flange portion 19 when the first flange portion 19 is viewed from the first cylindrical wind tunnel half 21 side. Furthermore, it extends in the axial direction along the first cylindrical wind tunnel half 21. Taking the engaging member 23B shown in FIGS. 5 and 7 as a representative example, the structure of the engaging member will be described with reference numerals assigned to the respective portions of the engaging member 23B. The engaging members 23A to 23D include two plate portions 23a and 23b that are opposed to each other in a direction orthogonal to the vertical direction and the above-described axial direction as viewed on the paper surface of FIGS. And three connecting portions 23c to 23e for connecting the two. The three connection parts 23c-23e are arrange | positioned at predetermined intervals in the axial direction. The two connecting portions 23c and 23d completely extend in the vertical direction between the two plate portions 23a and 23b, thereby partitioning the space between the two plate portions 23a and 23b. The connecting portion 23e extends slightly downward from above between the two plate portions 23a and 23b, and connects only a part of the upper edge portions of the two plate portions 23a and 23b. Therefore, an opening 23f is formed between the two plate portions 23a and 23b, the connecting portion 23e, and the first cylindrical wind tunnel half portion 21. A hole 23g that opens upward is formed between the connecting portion 23d and the connecting portion 23e.

  The four first stopper portions 25 </ b> A to 25 </ b> D have a substantially rectangular flat plate shape formed integrally with the first flange portion 19, and its base portion is integrated with the first cylindrical wind tunnel half portion 21. Are combined. These four first stopper portions 25 </ b> A to 25 </ b> D may protrude outward from the outline of the first flange portion 19 when the first flange portion 19 is viewed from the first cylindrical wind tunnel half portion 21 side. It extends in the axial direction along the first cylindrical wind tunnel half 21 so as not to be present. The arrangement state of these four first stopper portions 25A to 25D will be described later.

  As shown in FIG. 7, the first support frame half 17 includes a first support frame main body half 27 and five first web halves 28 </ b> A to 28 </ b> E. The first support frame main body half portion 27 includes a disc portion 27b having an opening portion 27a at the center portion and a peripheral wall portion 27c extending in the axial direction from the outer peripheral portion of the disc portion 27b. In the opening 27a, a metal first bearing holder 77 made of brass is fitted and fixed (FIG. 1). A stator substrate 85 of the first motor 3 is disposed in a space surrounded by the disc portion 27b and the peripheral wall portion 27c (FIG. 1). Four first through-hole half portions 29 </ b> A to 29 </ b> D that penetrate in the axial direction of the rotation shaft 71 of the first motor 3 are formed in the first support frame main body half portion 27. These four first through-hole halves 29A to 29D are formed at equal intervals in the circumferential direction. Of the four first through-hole halves 29A to 29D, one through-hole half 29A communicates with the inside of the first lead wire guide passage half 31 of the first web half 28A described later. Yes.

  The five first web halves 28 </ b> A to 28 </ b> E are predetermined in the circumferential direction between the peripheral wall portion 27 c of the first support frame main body half portion 27 and the inner peripheral surface of the first housing main body half portion 15. The first support frame body half part 27 and the first housing body half part 15 are connected to each other with a space therebetween. Of the five first web halves 28A to 28E, one first web halve 28A is a web half (hereinafter simply referred to as a half of the first lead wire guide passage half 31). The first lead wire guide web half 28A). As shown in FIGS. 7 and 8, the first lead wire guide web half portion 28A has a bottom wall 28a and a pair of side wall portions 28b rising from the bottom wall 28a to the second motor 7 side. A region surrounded by the bottom wall 28a and the pair of side wall portions 28b constitutes the first lead wire guide passage half 31 (FIG. 7). As shown in FIG. 8, the pair of side wall portions 28b includes a convex portion 28d that protrudes toward the second lead wire guide web half portion 55A, which will be described later, and a concave portion 28e that is recessed toward the bottom wall 28a. Are formed respectively. In this example, the convex portion 28d and the concave portion 28e provided on one side of the pair of side wall portions 28b respectively oppose the convex portion 28d and the concave portion 28e provided on the other side of the pair of side wall portions 28b in the circumferential direction. The contour shape of the convex portion 28d and the contour shape of the concave portion 28e each have an isosceles trapezoidal shape. The convex portion 28d and the concave portion 28e are formed such that adjacent inclined surfaces 28d1 and 28e2 are continuous. The convex portion 28d extends beyond the virtual reference dividing plane F, which is a dividing plane when the first supporting frame half 17 and a second supporting frame half 35 described later are divided into two parts. It protrudes to the wire guide web half 55A side. And the end surface 28f of a pair of side wall part 28b except the part in which the convex part 28d and the recessed part 28e are formed is located in the virtual reference | standard division surface F. FIG. Further, as shown in FIG. 4, in the vicinity of the portion where the first lead wire guide web half portion 28A of the first cylindrical wind tunnel half portion 21 is joined, the first lead wire guide web half portion 28A is located within the first lead wire guide web half portion 28A. An opening 21d that opens is formed. The lead wire l is led out through the opening 21d.

  The second divided housing unit 13 is also made of synthetic resin or aluminum, and integrally includes a second housing body half 33 and a second support frame half 35 as shown in FIG. The second housing main body half portion 33 includes a second flange portion 37, a second cylindrical wind tunnel half portion 39, four engaged members 41A to 41D, and four second stopper portions 43A to 43D. is doing. The second flange portion 37 has a quadrangular outline having four corners including first to fourth corners 37a to 37d arranged in the circumferential direction, and has a discharge port 13a at the other end of the axial method. . At the four corners 37a to 37d of the second flange portion 37, corners are rounded, and through holes 37e into which fittings for attaching the counter-rotating axial flow fan to the electric device are inserted are formed. Yes. One end of the second cylindrical wind tunnel half 39 is integrally formed with the second flange portion 37 and has a main portion of the second space S2 therein.

  Four flat surface portions 45 are formed on the outer peripheral surface portion (fitted portion) of the other end 39a of the second cylindrical wind tunnel half portion 39 at equal angular intervals in the circumferential direction. These four flat surface portions 45 are in contact with the flat surface portion 21c of the wall portion 21a of the first cylindrical wind tunnel half 21 when the first divided housing unit 11 and the second divided housing unit 13 are coupled. To do. By such contact between the flat surface portion 21c and the flat surface portion 45, the first and second divided housing units 11 and 13 are positioned in the circumferential direction.

  The four engaged members 41 </ b> A to 41 </ b> D are formed integrally with the second flange portion 37 and are arranged at intervals in the circumferential direction. These four engaged members 41 </ b> A to 41 </ b> D are disposed in the vicinity of the four corners 37 a to 37 d of the second flange portion 37 in a state of being integrally coupled to the second cylindrical wind tunnel half 39. The four engaged members 41 </ b> A to 41 </ b> D do not protrude outward from the outline of the second flange portion 37 when the second flange portion 37 is viewed from the second cylindrical wind tunnel half side 39. Thus, it extends in the axial direction along the second cylindrical wind tunnel half 39. Taking the engaged member 41B of FIGS. 5 and 9 as a representative example, the engaged member 41B is denoted by a reference numeral, and the configuration of the engaged member will be described. The engaged members 41 </ b> A to 41 </ b> D include a support portion 47 provided integrally with the second flange portion 37, a rib 49 coupled to the support portion 47 and the second cylindrical wind tunnel half 39, and a support portion 47. It has a nail structure 51 supported at one end. The nail | claw structure 51 has the plate-shaped part 51a and the nail | claw part 51b and the protrusion 51c which were integrally formed in the plate-shaped part 51a. The plate-like portion 51 a is connected to the support portion 47 with a space between the plate-like portion 51 a and the rib 49. The plate-like portion 51a extends from the support portion 47 toward the first divided housing unit 11 side. The nail | claw part 51b protrudes in the direction orthogonal to the plate | board surface of the plate-shaped part 51a from the front-end | tip part of the plate-shaped part 51a (FIG. 5 upper direction of the paper surface). The upper surface of the claw portion 51b has an inclined surface 51d that is inclined so that the thickness of the claw portion increases from the tip toward the support portion 47 side. Specifically, each claw portion 51b of the engaged members 41A and 41B protrudes upward in the paper surface of FIG. 9, and each claw portion 51b of the engaged members 41C and 41D is on the paper surface of FIG. It protrudes downward. The protrusion 51c is arranged at an interval in the axial direction from the claw 51b, and protrudes in the same direction as the direction in which the claw 51b protrudes from the plate-like part 51a. The cross section of the protrusion 51b has a substantially rectangular parallelepiped shape. A mode in which the four engaged members 41A to 41D engage with the four engaging members 23A to 23D of the second divided housing unit 13 will be described in detail later.

  The four second stopper portions 43A to 43D have a rectangular flat plate shape formed integrally with the second flange portion 37, and are disposed adjacent to the four engaged members 41A to 41D, respectively. ing. The four second stopper portions 43 </ b> A to 43 </ b> D are integrally coupled to the second cylindrical wind tunnel half 39, and the second flange portion 37 is viewed from the second cylindrical wind tunnel half 39. It extends in the axial direction along the second cylindrical wind tunnel half 39 so that it does not protrude outward from the contour of the second flange portion 37 at the time. Specifically, as shown in FIGS. 6 and 9, among the four corners 37 a to 37 d of the second flange portion 37, two first and third corners 37 a and 37 c that are opposed to each other in the radial direction of the axis A are formed. When the virtual diagonal line D3 to be connected is hypothesized, the engaged members 41A and 41C opposed in the radial direction and the second stopper members 43A and 43C respectively corresponding to the engaged members 41A and 41C are the virtual diagonal line D3. Are arranged with a gap between them. Further, when the virtual diagonal line D4 connecting the remaining two second and fourth corners 37b and 37d facing the radial direction of the axis A among the four corners 37a to 37d of the second flange portion 37 is assumed, the diameter The engaged members 41B and 41D facing each other and the second stopper members 43B and 43D respectively corresponding to the engaged members 41B and 41D are arranged so as to sandwich the virtual diagonal line D4 therebetween. Then, none of the engaged members 41A to 41D and the second stopper members 43A to 43D are arranged at the portions of the four corners 37a to 37d through which the third or fourth virtual diagonal lines D3 and D4 pass. In other words, the engaged members 41A and 41B are arranged in the region between the first corner 37a and the second corner 37b of the second flange portion 37, and the second corner 37b and the third corner 37b The second stopper members 43B and 43C are arranged in the area between the corner 37c, and the engaged members 41C and 41D are arranged in the area between the third corner 37c and the fourth corner 37d. In addition, second stopper members 43D and 43A are arranged in a region between the fourth corner 37d and the first corner 37a.

  The above-described four first stopper portions 25A to 25D shown in FIGS. 4 and 7 are also arranged adjacent to the four engaging members 23A to 23D, respectively. The positional relationship between the four first stopper portions 25A to 25D and the four engaging members 23A to 23D is such that the four second stopper portions 43A to 43D and the four engaged members 41A to 41D shown in FIG. It is the same as the positional relationship. Specifically, as shown in FIG. 7, a virtual diagonal line connecting two first and third corners 19 a and 19 c facing each other in the radial direction of the axis A among the four corners 19 a to 19 d of the first flange portion 19. When D1 is hypothesized, the engaging members 23A and 23C facing in the radial direction and the first stopper members 25A and 25C corresponding to the engaging members 23A and 23C sandwich the virtual diagonal line D1 therebetween. Has been placed. In addition, when the virtual diagonal line D2 connecting the remaining two second and third corners 19b and 19d facing each other in the radial direction of the axis A among the four corners 19a to 19d of the first flange portion 19 is hypothesized, The engaging members 23B, 23D facing each other and the first stopper members 25B, 25D respectively corresponding to the engaging members 23B, 23D are arranged so as to sandwich the virtual diagonal line D2 therebetween. And neither engagement member 23A-23D nor 1st stopper member 25A-25D is arrange | positioned in the part of the four corners 19a-19d through which the 1st or 2nd virtual diagonal D1, D2 passes. In other words, the engaging members 23A and 23B are arranged in the region between the first corner 19a and the second corner 19b of the first flange portion 19, and the second corner 19b and the third corner 19b are arranged. The first stopper members 25B and 25C are disposed in the region between the first corner 19c and the engaging members 23C and 23D are disposed in the region between the third corner 19c and the fourth corner 19d. In addition, first stopper members 25D and 25A are arranged in a region between the fourth corner 19d and the first corner 19a. The four first stopper portions 25A to 25D and the four second stopper portions 43A to 43D are formed in a state where the claw portion 51b and the hole portion 23g of the engaging members 23A to 23D are completely engaged. Each stopper portion 25A to 25D has a shape and a size such that the tips of the four stopper portions 25A to 43D abut against the tips of the four second stopper portions 43A to 43D.

  As shown in FIG. 9, the second support frame half portion 35 includes a second support frame main body half portion 53 and five second web half portions 55A to 55E. The second support frame main body half 53 includes a disc part 53b having an opening 53a at the center part and a peripheral wall part 53c extending in the axial direction from the outer periphery of the disc part 53b. In the opening 53a, a metal second bearing holder 177 made of brass is fitted and fixed (FIG. 1). A stator substrate 185 of the second motor 7 is disposed in a space surrounded by the disc portion 53b and the peripheral wall portion 53c (FIG. 1). The second support frame body half 53 is formed with four second through-hole halves 57A to 57D penetrating in the axial direction of the rotation shaft 171 of the second motor 7 described later. The four second through-hole halves 57A to 57D are formed at equal intervals in the circumferential direction of the rotating shaft 171 (FIG. 1). Of the four second through-hole half portions 57A to 57D, one through-hole half portion 57A communicates with the inside of the second lead wire guide passage half portion 59 of the second web half portion 55A described later. Yes. The four second through-hole halves 57A to 57D are formed in the same shape as the four first through-hole halves 29A to 29D of the first support frame main body half 27, respectively. The five second web halves 55 </ b> A to 55 </ b> E are predetermined in the circumferential direction between the peripheral wall 53 </ b> C of the second support frame main body half 53 and the inner peripheral surface of the second housing main body half 33. The second support frame main body half 53 and the second housing main body half 33 are connected to each other at an interval. Of the five second web halves 55A to 55E, one second web halve 55A is a web half (hereinafter simply referred to as “half web lead”) having a second lead wire guide channel half 59 therein. Second lead wire guide web half 55A). The second lead wire guide web half portion 55A has a bottom wall 55a and a pair of side wall portions 55b rising from the bottom wall 55a toward the first single axial fan 1 side. A second lead wire guide passage half portion 59 is configured by a region surrounded by the bottom wall 55a and the pair of side wall portions 55b. The pair of side wall portions 55b are respectively formed with one convex portion 55d projecting toward the first lead wire guide web half portion 28A side and one concave portion 55e dented toward the bottom wall 55a side. In this example, the convex part 55d and the recessed part 55e provided in one of a pair of side wall part 55b are facing the convex part 55d and the recessed part 55e provided in the other of a pair of side wall part 55b in the circumferential direction, respectively. As shown in FIG. 8, the convex portion 55 d has the first lead wire beyond the virtual reference dividing plane F in which the first support frame half portion 17 and the second support frame half portion 35 are divided into two. Projecting toward the guide web half 28A. In addition, an opening 39d that opens into the second lead wire guide web half 55A is provided in the vicinity of the portion where the second lead guide web half 55A is joined to the second cylindrical wind tunnel half 39. It is formed (FIGS. 4 and 9). The manner in which the first lead wire guide web half 28A and the second lead wire guide web half 55A are coupled will be described in detail later.

  In the counter-rotating axial flow fan of this example, the first divided housing unit 11 and the second divided housing unit 13 are coupled as follows. Actually, the first motor 3 (FIG. 1), the first impeller 5 and the like are arranged in the first divided housing unit 11, and predetermined lead wires are placed in the first lead wire guide web half portion 28A. Arrange to make the first single axial fan. Further, the second motor 7 (FIG. 1), the second impeller 9 and the like are arranged in the second divided housing unit 13, and predetermined lead wires are arranged in the second lead wire guide web half 55A. To make a second single axial fan. And the 1st division | segmentation housing unit 11 and the 2nd division | segmentation housing unit 13 are couple | bonded by combining a 1st single axial flow fan and a 2nd single axial flow fan. First, the first divided housing unit 11 and the second divided housing unit 13 are brought close to each other, and the second divided housing unit is inserted into the openings 23f of the four engaging members 23A to 23D of the first divided housing unit 11. The tips of the claw portions 51b of the 13 four engaged members 41A to 41D are respectively inserted. Referring to FIG. 5, after such insertion, when the engaged member 41B and the engaging member 23B are brought close to each other, the inclined surface 51d of the claw portion 51B and the lower edge of the connecting portion 23e come into contact with each other. To do. Due to the contact between the inclined surface 51d and the connecting portion 23e, the plate-like portion 51a bends so as to approach the rib 49 side. Further, when the engaged member 41B and the engaging member 23B are brought closer to each other and the contact between the inclined surface 51d and the connecting portion 23e is released, the connecting portion 23e is connected to the claw portion 51a and the convex portion 51b of the engaged member 41B. The claw portion 51b engages with the hole portion 23g. Thereby, the engagement between the engaging member 23B and the engaged member 41B is completed. In this structure, the rib 49 functions as a stopper that prevents the claw constituting body 51 from being bent more than necessary. In addition, the protrusion 51c serves as a stopper that prevents the claw portion 51bc from moving to the first cylindrical wind tunnel half 21 side. In this example, the claw portion 51b and the hole portion 23g are configured such that the engagement state can be visually confirmed in a state where the claw portion 51b is engaged with the hole portion 23g.

  When making such an engagement state, the fitting portion constituted by the inner peripheral surface portion of the other end 21a of the first cylindrical wind tunnel half 21 and the other end 21a of the second cylindrical wind tunnel half 39 are provided. A fitting structure is configured by fitting with a fitted portion constituted by the outer peripheral surface portion. Due to such a fitting structure and the engagement structure of the claw portion 51b and the hole 23g of the engagement members 23A to 23D described above, the first divided housing unit 11 and the second divided housing unit 13 are coupled. The structure is structured. Further, in the state in which the first divided housing unit 11 and the second divided housing unit 13 are coupled in this way, the tips of the four first stopper portions 25A to 25D are the four second stopper portions 43A to 43D. It is abutting against the tip of.

  Further, as shown in FIG. 2, the first housing main body half portion 15 included in the first divided housing unit 11 and the second housing main body included in the second divided housing unit 13 are obtained by such coupling. A housing body 61 is constituted by the half portion 33. A motor support frame 63 is constituted by the first support frame half 17 included in the first split housing unit 11 and the second support frame half 35 included in the second split housing unit 13. . In other words, the first support frame half 17 and the second support frame half 35 are obtained by dividing the motor support frame 63 into two along the virtual reference dividing plane F extending in the radial direction. (See FIG. 8). Further, the support frame main body 65 includes a first support frame main body half 27 included in the first support frame half 17 and a second support frame main half 53 included in the second support frame half 35. Is configured. Thereby, the four first through-hole halves 29A to 29D of the first divided housing unit 11 and the four second through-hole halves 57A to 57D of the second divided housing unit 13 are combined. Four through holes 67A to 67D are formed. The five first web halves 28A to 28E included in the first support frame half 11 and the five second web halves 55A to 55E included in the second support frame half 35 are also described. Thus, five webs 69A to 69E are formed. The five webs 69A to 69E constitute a stationary blade having a meteor section in cross section. Of the five webs 69A to 69E, the web 69A constitutes a lead wire guide web 69A in which the first lead wire guide web half 28A and the second lead wire guide web half 55A are combined. ing. In the lead wire guide web 69A, as shown in FIG. 8, the convex portion 28d of the first lead wire guide web half portion 28A is fitted with the concave portion 55e of the second lead wire guide web half portion 55A. The concave portion 28e of the first lead wire guide web half portion 28A is fitted with the convex portion 55d of the second lead wire guide web half portion 55A. A lead wire guide passage (not shown) is formed in the lead wire guide web 69A. In the lead wire guide path, a plurality of lead wires and signal wires for supplying power to the first and second motors 3 and 7 are guided. Then, as shown in FIG. 4, a plurality of lead wires L indicated by broken lines are led out from the openings 21d and 39d from the lead wire guide passage of the lead wire guide web 69A. The remaining four webs 69B to 69E among the five webs 69A to 69E are the four first web half portions 28B to 28E and the four webs so that the virtual reference division plane F becomes the division plane, respectively. Are divided into second web halves 55B to 55E.

  Returning to FIG. 1, the first motor 3 has a rotating shaft 71, a stator 73, and a rotor 75. The rotating shaft 71 is rotatably supported by the first bearing holder 77 by two bearings 79 fitted to the first bearing holder 77.

  The stator 73 includes a stator core 81, an excitation winding 83, and a circuit board 85. The stator core 81 is configured by laminating a plurality of steel plates, and is fixed to the first bearing holder 77. The stator core 81 has a plurality of salient pole portions 81 a arranged in the circumferential direction of the rotating shaft 71. The exciting winding 83 is attached to each salient pole portion 81a via an insulator 84. The circuit board 85 is disposed along the first support frame main body half 27 at a predetermined interval from the first support frame main body half 27. The circuit board 85 is mounted with an exciting current energizing circuit for causing an exciting current to flow through the exciting winding 83. In this example, the exciting current energizing circuit and the exciting winding 83 on the circuit board 85 are passed through the through-holes of the circuit board 85 and soldered to the electrodes on the circuit board 85 to the exciting winding 83. The lead wire is wound and electrically connected. The circuit board 85 has a plurality of substrate through holes 85a. The plurality of substrate through-holes 85 a are formed at equal intervals in the circumferential direction of the rotating shaft 71, and the four first through-hole half portions 29 </ b> A of the first support frame main body half portion 27 from the periphery of the stator 73. Air to ~ 29D passes.

  The rotor 75 includes an annular member 89 and a plurality of permanent magnets 91 fixed to the inner peripheral surface of the annular member 89. The annular member 89 is fixed inside the peripheral wall portion 93a of the cup-shaped member 93 of the first impeller 5 described later.

  As shown in FIG. 10, the first impeller 5 includes a cup-shaped member 93 and nine blades 95. The cup-shaped member 93 includes a peripheral wall portion 93a to which nine blades 95 are fixed, and a bottom wall portion 93b that is integrally provided at one end of the peripheral wall portion 93a and to which one end of the rotary shaft 71 of the first motor 3 is fixed. And have. A plurality of ventilation holes 93c are formed in the bottom wall portion 93b. The plurality of ventilation holes 93 c are formed at equal intervals in the circumferential direction of the rotation shaft 71. The plurality of ventilation holes 93 c have elongated shapes extending in the radial direction of the rotation shaft 71 of the first motor 3. The plurality of ventilation holes 93 c play a role of introducing the air sucked from the suction port 11 a into the internal space of the first motor 3.

  As described above, the annular member 89 of the rotor 75 is fixed to the inside of the peripheral wall portion 93a of the cup-shaped member 93 of the first impeller 5, so that the first impeller 5 is in the first space S1. The first motor 3 rotates in the first rotation direction (counterclockwise direction toward FIG. 10) R1.

  As shown in FIG. 1, the second motor 7 has a rotating shaft 171, a stator 173, and a rotor 175. The rotating shaft 171 is rotatably supported by the second bearing holder 177 by two bearings 179 fitted to the second bearing holder 177. The rotating shaft 171 rotates in the direction opposite to the rotating direction of the rotating shaft 71 of the first motor 3. Since the structure of the rotating shaft 171, the stator 173, and the rotor 175 is the same as the structure of the rotating shaft 71, the stator 73, and the rotor 75 of the first motor 3, a code obtained by adding 100 to the code attached to the first motor 3 A description thereof will be omitted.

  As shown in FIG. 11, the second impeller 9 includes a cup-shaped member 193 and seven blades 195. The cup-shaped member 193 includes a peripheral wall portion 193a to which the seven blades 195 are fixed, and a bottom wall portion 193b that is integrally provided at one end of the peripheral wall portion 193a and to which one end of the rotating shaft 171 of the second motor 7 is fixed. And have. A plurality of ventilation holes 193c are formed in the bottom wall portion 193b. The plurality of ventilation holes 193c are formed at equal intervals in the circumferential direction of the rotation shaft 171 at positions away from the rotation shaft 171 of the bottom wall portion 193b. The plurality of ventilation holes 193 c have an elongated arc shape extending in the circumferential direction of the rotation shaft 171. The plurality of ventilation holes 193c serve to discharge the air introduced into the internal space of the second motor 7 to the outside. As shown in FIG. 1, an annular member 189 of the rotor 175 of the second motor 7 is fixed inside the peripheral wall portion 193 a of the cup-shaped member 193 of the second impeller 9. As described above, since the rotation shaft 171 of the second motor 7 rotates in the direction opposite to the rotation direction of the rotation shaft 71 of the first motor 3, the second impeller 9 is moved in the second space S2. The second motor 7 rotates in the second rotation direction (clockwise direction toward FIG. 11) R2 opposite to the first rotation direction.

  In the counter-rotating axial flow fan of this example, as shown in FIG. 1, the first impeller 5 rotates in the first rotation direction, and the second impeller 9 rotates in the reverse direction to the first rotation direction. When rotated in the direction of rotation 2, the air sucked from the suction port 11a is discharged from the discharge port 13a, and the inside of the electric device is cooled.

  According to the counter-rotating axial flow fan of the present example, the one or more convex portions 28d provided on the pair of side wall portions (28b, 55b) of the first and second web half portions 28A to 28E, 55A to 55E, The so-called height of the pair of side wall portions (28b, 55b) can be increased by the amount that 55d extends beyond the virtual reference dividing plane F. As a result, the possibility that the lead wire protrudes from between the pair of side wall portions (28b, 55b) is greatly reduced. When the first divided housing unit 11 and the second divided housing unit 13 are coupled, a plurality of lead wires are coupled. The possibility of occurrence of a situation where the lead wire is sandwiched between the side wall portions of the first and second web halves 28A to 28E and 55A to 55E can be greatly reduced.

  Further, according to the counter-rotating axial flow fan of the present example, the engagement member formed integrally with the first flange portion 19 in the coupling structure for coupling the first and second divided housing units 11 and 13. 23A to 23D and engaged members 41A to 41D formed integrally with the second flange portion 37 are used. Therefore, in addition to the fitting structure formed by fitting the other end 21a of the first cylindrical wind tunnel half 21 and the other end 39a of the second cylindrical wind tunnel half 39, there are four engagements. The coupling of the first and second divided housing units 11 and 13 is also achieved by the engagement structure of the members 23A to 23D and the four engaged members 41A to 41D. As a result, the force does not concentrate on the fitting structure of the first and second cylindrical wind tunnel halves, and the first and second divided housing units do not easily come off. . Further, a plurality of first stopper portions 25A to 25D are provided adjacent to the engaging members 23A to 23D, and a plurality of second stopper portions 43A to 43D are provided adjacent to the engaged members 41A to 41D. Therefore, when the first divided housing unit 11 and the second divided housing unit 13 are coupled, the engaging members 23A to 23D and the engaged members 41A to 41D are connected from the first and second flange portions 19 and 37. Even when force is applied intensively to the front end portions of the first stopper portions 25A to 25D and the second stopper portions 43A to 43D adjacent to the engaging members 23A to 23D and the engaged members 41A to 41D. The tip part hits each other. As a result, even if the engaging members 23A to 23D are strongly pressed against the engaged members 41A to 41D, the engaging members 23A to 23D or the engaging portions of the engaged members 41A to 41D are prevented from being damaged. Can do.

It is half part sectional drawing of the counter-rotating type axial flow fan of embodiment of this invention. It is a perspective view of the housing of the counter-rotating axial flow fan shown in FIG. It is a top view of the counter-rotating axial-flow fan shown in FIG. It is a left view of the counter-rotating axial flow fan shown in FIG. It is a figure of a part of cross section which cut | disconnected FIG. 3 by the VV line. It is the VI-VI sectional view taken on the line of FIG. It is a perspective view of the 1st division | segmentation housing unit of the counter-rotating axial-flow fan shown in FIG. It is a figure for demonstrating the aspect of the lead wire guide web of the counter-rotating axial-flow fan shown in FIG. It is a perspective view of the 2nd division | segmentation housing unit of the counter-rotating axial flow fan shown in FIG. It is a perspective view of the 1st impeller of the counter-rotating axial-flow fan shown in FIG. It is a perspective view of the 2nd impeller of the counter-rotating axial flow fan shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 3 1st motor 5 1st impeller 7 2nd motor 9 2nd impeller 11 1st division | segmentation housing unit 13 2nd division | segmentation housing unit 15 1st housing main body half part 17 1st support frame Half portion 19 First flange portion 21 First cylindrical wind tunnel half portion 21b Half portion (fitting portion)
23A to 23D Engaging member 23g Hole portion 25A to 25D First stopper portion 27 First support frame main body half portion 28A to 28E First web half portion 31 First lead wire guide passage half portion 33 Second housing Main body half part 35 Second support frame half part 37 Second flange part 39 Second cylindrical wind tunnel half part 39a Outer peripheral surface (fitting part)
41A to 41D Engaged members 43A to 43D Second stopper portion 45 Flat surface 51b Claw portion 53 Second support frame main body half portion 55A to 55E Second web half portion 59 Second lead wire guide passage half portion A Axis D1-D4 Virtual diagonal F F Virtual reference split plane

Claims (6)

A housing provided with a housing body having a wind tunnel having a suction port on one side in the axial direction and a discharge port on the other side in the axial direction; and a motor support frame disposed in a central portion of the wind channel;
A first impeller having a plurality of blades disposed in a first space between the motor support frame in the housing and the suction port;
A first motor having a first rotating shaft to which the first impeller is fixed, and rotating the first impeller in a first rotation direction in the first space;
A second impeller having a plurality of blades disposed in a second space between the motor support frame and the outlet in the housing;
A second rotation shaft to which the second impeller is fixed; and a second rotation shaft that rotates the second impeller in a second rotation direction opposite to the first rotation direction in the second space. Two motors,
The motor support frame is disposed at a predetermined interval in a circumferential direction of the rotating shaft between a support frame main body located at a central portion of the wind tunnel, and the support frame main body and the housing main body. A plurality of webs connecting the support frame main body and the housing main body,
The housing is constituted by first and second divided housing units connected by a coupling structure;
The first split housing unit includes a first flange portion having the suction port at one end, and a first flange portion integrally formed with the first flange portion and having a main portion of the first space inside. A first housing body half having a cylindrical wind tunnel half and a motor reference frame obtained by dividing the motor support frame into two along a radial reference dividing plane extending in a radial direction perpendicular to the axial direction. One support frame half,
The second split housing unit includes a second flange portion having the discharge port at one end, and a second flange portion formed integrally with the second flange portion and having a main portion of the second space inside. A second half of the housing body having a cylindrical wind tunnel half and a second support frame half obtained by dividing the motor support frame into two along the virtual reference dividing plane. And
The coupling structure is formed at the other end of the first cylindrical wind tunnel half and the other end of the second cylindrical wind tunnel half and is fitted with the fitting portion. A plurality of engaging members formed integrally with the fitted portion, the first flange portion, spaced apart in the circumferential direction and extending along the first cylindrical wind tunnel half; A plurality of engaged members that are formed integrally with the second flange portion and are spaced apart from each other in the circumferential direction, extend along the second cylindrical wind tunnel half, and engage with the plurality of engaging members. Composed of joint members,
A plurality of first stopper portions formed integrally with the first flange portion, disposed adjacent to the engaging member, and extending along the first cylindrical wind tunnel half;
A plurality of engaging members and a plurality of engaged members formed integrally with the second flange portion, disposed adjacent to the engaged members, extending along the second cylindrical wind tunnel half; A counter-rotating shaft comprising a plurality of second stopper portions having tip portions that abut against the tip portions of the plurality of first stopper portions in a state in which the combined member is completely engaged. Current blower. Each of the first flange portion and the second flange portion has a contour shape having four corners including first to fourth corners arranged in the circumferential direction,
The four engaging members and the four first stopper portions are arranged near the four corners of the first flange portion, respectively.
The four engaged members and the four second stopper portions are arranged in the vicinity of the four corners of the second flange portion, respectively.
Two engagement members are disposed in a region between the first corner and the second corner of the first flange portion, and are disposed between the second corner and the third corner. Two first stopper portions are disposed in the region, two engagement members are disposed in the region between the third corner and the fourth corner, and the fourth In the region between the corner and the first corner, the two first stopper portions are arranged,
Two engaged members are disposed in a region between the first corner and the second corner of the second flange portion, and between the second corner and the third corner. In the region, two second stopper portions are disposed, and in the region between the third corner and the fourth corner, the two engaged members are disposed, 2. The counter-rotating axial flow fan according to claim 1, wherein two second stopper portions are disposed in a region between four corners and the first corner.   The plurality of engaging members are integrally coupled to the first cylindrical wind tunnel half, and the plurality of engaged members are integrally coupled to the second cylindrical wind tunnel half. The counter-rotating axial flow fan according to 1 or 2. When the first virtual diagonal line connecting the two corners facing the radial direction of the rotation axis among the four corners of the first flange portion and the second virtual diagonal line connecting the remaining two corners are hypothesized. The engaging member and the first stopper member corresponding to the engaging member are arranged so as to sandwich the first or second virtual diagonal line therebetween,
Neither the engagement member nor the first stopper member is disposed at the four corner portions through which the first or second virtual diagonal passes,
When imagining a third virtual diagonal line connecting the two corners facing the radial direction of the rotation axis among the four corners of the second flange portion and a fourth virtual diagonal line connecting the remaining two corners The engaged member and the second stopper member corresponding to the engaged member are arranged so as to sandwich the third or fourth virtual diagonal line therebetween,
2. The counter-rotating shaft according to claim 1, wherein neither the engaged member nor the second stopper member is arranged at the four corner portions through which the third or fourth virtual diagonal passes. Current blower. One of the engaging member and the engaged member includes a claw portion,
The other of the engaging member and the engaged member includes a hole portion with which the claw portion is engaged,
When the engaging member and the engaged member perform an operation of fitting the engaging member and the engaged member, at least one of the engaging member and the engaged member bends, When the engagement between the engaging member and the engaged member is completed, the claw portion and the hole portion are configured to be in an engaged state,
2. The counter-rotating axial flow fan according to claim 1, wherein the hole portion is formed so that the engagement state can be visually confirmed in a state where the claw portion is engaged with the hole portion. The plurality of engaging members and the plurality of first stopper members are outward from an outline of the first flange portion when the first flange portion is viewed from the first cylindrical wind tunnel half side. Their shape is determined so as not to protrude,
The plurality of engaged members and the plurality of second stopper members are outside the outline of the second flange portion when the second flange portion is viewed from the second cylindrical wind tunnel half side. The counter-rotating axial-flow fan according to claim 1, wherein the shape thereof is determined so as not to protrude.