JP2019167031A - Airflow forming member and air conditioner for railway vehicle - Google Patents

Abstract

To provide an airflow forming member, which hardly contacts with other member even when it is turned over and used, and an air conditioner for a railway vehicle including the same.SOLUTION: A though hole 41 through which a rotating shaft of a motor is inserted is formed in a boss 40. An impeller 50 is fixed to the boss 40 while being in contact with an outer peripheral surface 43 of the boss 40 and generates airflow by being rotated together with the boss 40. Peripheral grooves 46, 47 having the depth in a direction parallel to the height direction and extending in a circumferential direction are formed between a peripheral edge of an opening of the through hole 41 and the outer peripheral surface 43 at each of one end and the other end of the boss 40 in the height direction parallel to the rotating shaft. When the boss 40 is fitted to the rotating shaft in a direction where the one end faces the motor, a cap 70 is fitted to the other end of the peripheral groove 47 to cover the opening of the other end. When the boss 40 is fitted to the rotating shaft in a direction where the other end faces the motor, the cap 70 is fitted to one end of the peripheral groove 46 to cover the opening of the one end.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an airflow forming member and a railway vehicle air conditioner.

  An air conditioner that air-conditions a room includes an outdoor heat exchanger disposed outside the room and an outdoor fan that forms an airflow passing through the outdoor heat exchanger. The outdoor blower includes a motor having a rotating shaft and an airflow forming member that forms an airflow by being rotated by the rotating shaft of the motor. The airflow forming member is configured by a boss fitted to the rotation shaft of the motor and an impeller fixed to the boss and rotating together with the boss.

  As disclosed in Patent Document 1, when the insertion hole for inserting the rotation shaft of the motor passes through the boss, the opening of the through hole on the end surface of the boss far from the motor is a cap. It is blocked by. The cap prevents water, dust and the like from entering from the opening of the through hole. A fitting allowance for fitting the cap is secured at one end portion of the boss in the height direction parallel to the rotation axis of the motor, and the cap is fitted into the fitting allowance.

JP 2003-232542 A

  The railway vehicle air conditioner that air-conditions the passenger compartment of the railway vehicle has a type in which the outdoor blower forms an airflow in the direction from the motor toward the airflow forming member and a type in which the airflow in the direction from the airflow forming member to the motor forms. There are things. The operation of the outdoor blower in the former type is called up blowing, and the operation of the outdoor blower in the latter type is called down blowing.

  If the airflow forming member can be turned upside down and attached to the motor, it is possible to cope with both top blowing and bottom blowing with one type of airflow forming member. For this reason, it is not necessary to manufacture separate airflow forming members for upper blowing and lower blowing. Therefore, a highly versatile airflow forming member that can be used upside down is desired.

  However, in order to realize an airflow forming member that can be used upside down, it is necessary to secure a fitting allowance for fitting the cap at the other end portion in the height direction of the boss. As a result, the height of the boss increases by the amount of the fitting allowance. In particular, in a railway vehicle, there is almost no space around the outdoor blower. Therefore, when the height of the boss increases, the airflow forming member tends to hit another member.

  An object of the present invention is to provide an airflow forming member that is unlikely to come into contact with other members even when used upside down, and a railway vehicle air conditioner including the airflow forming member.

In order to achieve the above object, the airflow forming member according to the present invention is:
The motor has an outer peripheral surface extending in the circumferential direction around the rotation shaft of the motor, and has a through hole into which the rotation shaft is inserted. The rotation shaft is inserted into the through hole in the state where the rotation shaft is inserted. A boss that is fitted and rotated by the rotating shaft;
An impeller that is fixed to the boss in contact with the outer peripheral surface of the boss, and generates an airflow by rotating together with the boss;
With
At each of one end and the other end of the boss in the height direction parallel to the rotation axis, a depth is set in a direction parallel to the height direction between the peripheral edge of the opening of the through hole and the outer peripheral surface. And a circumferential groove extending in the circumferential direction is formed,
When the boss is fitted to the rotating shaft in a direction where the one end faces the motor, a cap that covers the opening at the other end is fitted into the circumferential groove at the other end, while the other end is When the boss is fitted to the rotating shaft in a direction facing the motor, the cap that covers the opening at the one end is fitted into the circumferential groove at the one end.

  According to the said structure, since a cap can be fitted in both the one end and other end of a boss | hub, the airflow formation member which concerns on this invention can be used inside out. Further, since the cap is fitted into the circumferential groove, an increase in the height of the boss is suppressed by the sum of the depth of the circumferential groove at one end and the depth of the circumferential groove at the other end. Therefore, even when the airflow forming member according to the present invention is used upside down, it does not easily come into contact with other members.

The fragmentary sectional view in the position of the AA-AA line shown in Drawing 5 of the outdoor unit room which the outdoor blower concerning Embodiment 1 is performing top blowing The fragmentary sectional view in the position of the AA-AA line shown in Drawing 5 of the outdoor unit room which the outdoor blower concerning Embodiment 1 is performing bottom blowing The fragmentary sectional view of the airflow formation member for railcar air conditioners concerning Embodiment 1 Sectional drawing of the boss | hub which concerns on Embodiment 1. The partial cross section top view which shows the inside of the outdoor unit room which concerns on Embodiment 1 The top view of the rail vehicle air conditioner concerning Embodiment 1 The block diagram which shows the structure of the air-conditioning equipment concerning Embodiment 1. Sectional drawing of the boss | hub which concerns on Embodiment 2. Partial sectional drawing of the airflow formation member for rail vehicle air conditioners concerning Embodiment 3 Partial sectional drawing of the airflow formation member for rail vehicle air conditioners concerning Embodiment 4 Partial sectional view of an airflow forming member for a railway vehicle air conditioner according to Comparative Embodiment 1 Partial sectional view of an airflow forming member for a railway vehicle air conditioner according to comparative form 2

  Hereinafter, an airflow forming member according to an embodiment of the present invention and a railcar air conditioner including the airflow forming member will be described with reference to the drawings. In the figure, the same or corresponding parts are denoted by the same reference numerals.

[Embodiment 1]
With reference to FIG.5 and FIG.6, the whole structure of the rail vehicle air conditioner 100 which concerns on this embodiment is demonstrated. The railway vehicle air conditioner 100 has a configuration in which the air conditioner 20 shown in FIG. 6 is housed in the housing 10 shown in FIG.

  As shown in FIG. 5, the housing 10 is defined by a box-shaped base frame 11 having an upper opening, a top plate 12 that closes the upper opening of the base frame 11, and the base frame 11 and the top plate 12. A partition plate 13 is provided to partition the internal space into the outdoor unit room R1 and the indoor unit room R2.

  A portion of the top plate 12 that covers the outdoor unit room R1 has a first vent hole 14 and two second vent holes 15 and 16 that are spaced apart from the first vent hole 14. Is formed. Each of the first vent 14 and the second vents 15 and 16 communicates the outdoor unit room R1 with the outside.

  The first vent 14 is formed in a circular shape in plan view. The second vent holes 15 and 16 are each formed in a rectangular shape that extends in the traveling direction of the railway vehicle in plan view. The second vent holes 15 and 16 are spaced apart in the width direction of the railway vehicle with the first vent hole 14 interposed therebetween.

  As shown in FIG. 6, the air conditioner 20 includes an outdoor heat exchanger 21 having a structure in which a refrigerant circulates inside, and a cooperation device group 22 that forms a refrigeration cycle together with the outdoor heat exchanger 21 using the refrigerant. Have

  Hereinafter, the function of the outdoor heat exchanger 21 and the configuration and function of the collaborative device group 22 will be described by taking the case of cooling the passenger compartment of the railway vehicle as an example. The outdoor heat exchanger 21 functions as a condenser that condenses the refrigerant by exchanging heat between the refrigerant and the air.

  The cooperating device group 22 passed through an expander 22a for expanding the refrigerant condensed in the outdoor heat exchanger 21, an indoor heat exchanger 22b as an evaporator for evaporating the expanded refrigerant, and the indoor heat exchanger 22b. It includes a gas-liquid separator 22c that separates the liquid from the refrigerant, and a compressor 22d that compresses the evaporated refrigerant and returns it to the outdoor heat exchanger 21.

  The air conditioner 20 includes an indoor blower 23 that promotes heat exchange between the indoor heat exchanger 22b and air, and an outdoor blower 24 that promotes heat exchange between the outdoor heat exchanger 21 and air. The indoor blower 23 is constituted by a centrifugal blower, and the outdoor blower 24 is constituted by a propeller type axial flow blower.

  The indoor blower 23 sends the air heat-exchanged with the indoor heat exchanger 22b into the passenger compartment of the railway vehicle. The outdoor blower 24 takes in air from the outside of the railway vehicle, and passes the taken-in air through the outdoor heat exchanger 21 to form an airflow that is discharged to the outside of the railway vehicle.

  Among the components of the air conditioner 20 described above, the outdoor heat exchanger 21 and the outdoor blower 24 are accommodated in the outdoor unit room R1 shown in FIG. The collaborative device group 22 and the indoor blower 23 are accommodated in the indoor unit room R2 shown in FIG.

  The railway vehicle air conditioner 100 according to the present embodiment is particularly characterized in the outdoor unit room R1. Therefore, the inside of the outdoor unit room R1 will be described in detail below.

  As shown in FIG. 4, the outdoor heat exchanger 21 includes a first outdoor heat exchanger 21 a and a second outdoor heat exchanger 21 b that are arranged with the outdoor blower 24 sandwiched in the width direction of the railway vehicle in a plan view. And have. An outdoor blower 24 is disposed between the first outdoor heat exchanger 21a and the second outdoor heat exchanger 21b.

  As shown in FIG. 1A, the outdoor blower 24 is placed on the bottom surface 11 a of the base frame 11. The central portion of the top plate 12 facing the bottom surface 11a of the base frame 11 in the width direction of the railcar is formed horizontally, and the first vent 14 shown in FIG. 5 is formed in the horizontal portion.

  Both shoulder portions of the top plate 12 in the width direction of the railway vehicle are inclined downward. The second vents 15 and 16 shown in FIG. 5 are formed on the inclined shoulder portions. And the 1st outdoor heat exchanger 21a is arrange | positioned in the position which faces one 2nd vent hole 15. As shown in FIG. A second outdoor heat exchanger 21 b is disposed at a position facing the other second vent 16.

  The first outdoor heat exchanger 21 a and the second outdoor heat exchanger 21 b are inclined downward along the inclination of both shoulders of the top plate 12. Thus, the first outdoor heat exchanger 21a and the second outdoor heat exchanger 21b are inclined so that the total height of the outdoor unit room R1, that is, the height from the bottom surface 11a of the base frame 11 to the first vent 14 is as much as possible. This is in order to realize heat exchange as efficiently as possible while a low profile is required.

  The outdoor blower 24 includes a motor 30 having a rotating shaft 31, an airflow forming member 60 for a railway vehicle air conditioner that is rotated by the rotating shaft 31 of the motor 30, and a cap 70 attached to the airflow forming member 60 for the railway vehicle air conditioner. With.

  As shown in FIG. 2, the airflow forming member 60 for a railway vehicle air conditioner includes a propeller-type impeller 50 and a boss 40 to which the impeller 50 is fixed. The boss 40 is rotated by the rotating shaft 31 of the motor 30 shown in FIG. 1A, and the impeller 50 rotates together with the boss 40.

  The boss 40 and the impeller 50 are made of different materials. Specifically, the boss 40 is made of metal, and the impeller 50 is made of resin. The impeller 50 is formed by injection molding.

  The boss 40 is formed with a through hole 41 into which the rotating shaft 31 of the motor 30 shown in FIG. 1A is inserted. The cap 70 is for closing the opening on the opposite side of the through hole 41 from the opening into which the rotating shaft 31 of the motor 30 is inserted.

  Returning to FIG. 1A, the description will be continued. The motor 30 is placed on the bottom surface 11 a of the base frame 11. The rotating shaft 31 of the motor 30 extends in the direction of the normal to the bottom surface 11a. The first air vent 14 is disposed at a position facing the airflow forming member 60 for a railway vehicle air conditioner fitted to the rotary shaft 31.

  Further, a bell mouth BM surrounding the railroad vehicle air conditioner airflow forming member 60 is provided on the outer periphery of the railcar air conditioner airflow forming member 60. The bell mouth BM is formed in a cylindrical shape that opens in a trumpet shape toward the bottom surface 11 a of the base frame 11.

  The railroad vehicle air conditioner airflow forming member 60 is rotated by the rotating shaft 31 of the motor 30, and thereby the airflow in the direction from the motor 30 toward the railcar air conditioner airflow forming member 60 is generated inside the outdoor unit R <b> 1. Form. The bellmouth BM plays a role of adjusting the airflow.

  Specifically, after flowing into the outdoor unit room R1 from the outside of the outdoor unit room R1 through the second vents 15 and 16, passing through the first outdoor heat exchanger 21a and the second outdoor heat exchanger 21b, the bell mouth An airflow that flows out from the first vent 14 to the outside of the outdoor unit room R1 is formed through the BM. Hereinafter, the operation of the outdoor blower 24 that forms such an air flow is referred to as top blowing.

  FIG. 1B shows an airflow in a direction from the airflow forming member 60 for a railway vehicle air conditioner toward the motor 30 in the opposite direction to the airflow shown in FIG. 1A. Hereinafter, the operation of the outdoor blower 24 that forms such an air flow is referred to as bottom blowing. In addition, when the bottom blowing is performed, the bell mouth BM is attached to the top plate 12 in an open direction like a trumpet.

  Specifically, the air flow shown in FIG. 1B flows into the outdoor unit room R1 from the first vent hole 14, passes through the bell mouth BM, and passes through the first outdoor heat exchanger 21a and the second outdoor heat exchanger 21b. Then, it flows out from the second vent holes 15 and 16 to the outside.

  The airflow forming member 60 for a railway vehicle air conditioner according to this embodiment is characterized by a highly versatile shape that can handle both the upper blowing shown in FIG. 1A and the lower blowing shown in FIG. 1B. Hereinafter, Comparative Examples 1 and 2 will be described with reference to FIGS. 10A and 10B in order to clarify the significance of the shape of the airflow forming member 60 for a railway vehicle air conditioner.

  As shown in FIG. 10A, a railcar air conditioner airflow forming member 90A according to Comparative Example 1 includes a boss 91A in which a through hole 92 is formed, and an impeller 97 that generates an airflow by rotating together with the boss 91A. Prepare. The boss 91A has an outer peripheral surface 93 extending in the circumferential direction around the rotation shaft 31 of the motor 30 shown in FIG. 1A. The impeller 97 is fixed to the boss 91 </ b> A while being in contact with the outer peripheral surface 93.

  A plurality of protruding portions 94 are formed on the outer peripheral surface 93 so as to protrude outward in the radial direction perpendicular to the rotation shaft 31 of the motor 30. The relative rotation of the impeller 97 around the rotation shaft 31 of the motor 30 with respect to the boss 91 </ b> A is prevented by the protrusion 94. For this reason, the impeller 97 rotates together with the boss 91A.

  A cap fitting portion 95 as a fitting allowance for fitting the cap 70 is provided at one end portion of the boss 91 </ b> A in the height direction parallel to the rotation shaft 31 of the motor 30. A cap 70 is fitted into the cap fitting portion 95.

  However, the cap fitting portion 95 is not provided at the other end portion in the height direction of the boss 91A. For this reason, the cap 70 cannot be mounted on the boss 91 </ b> A when the railcar air conditioner airflow forming member 90 </ b> A is turned over and fitted to the rotating shaft 31 of the motor 30. Here, “turn over” means that the airflow forming member 90 </ b> A for the railway vehicle air conditioner is turned upside down so that one end portion of the boss 91 </ b> A faces the motor 30.

  For the above reasons, the railroad vehicle air conditioner airflow forming member 90 </ b> A according to the comparative example 1 is exclusively used for lower blowing and is not used for upper blowing. Next, Comparative Example 2 in which the airflow forming member 90A for a railway vehicle air conditioner is modified so as to be applicable to both upper blowing and lower blowing will be described.

  As shown in FIG. 10B, the boss 91B of the railroad vehicle air conditioner airflow forming member 90B according to the comparative example 2 has not only a cap fitting portion 95 at one end portion in the height direction but also the other end in the height direction. The portion also has a cap fitting portion 96.

  For this reason, even when the airflow forming member 90B for a railway vehicle air conditioner is turned upside down and fitted to the rotating shaft 31 of the motor 30, the cap 70 can be attached to the boss 91B. By turning the railroad vehicle air conditioner airflow forming member 90B upside down, an airflow opposite to the airflow formed by the railcar air conditioner airflow forming member 90A according to the comparative example 1 can be formed.

  However, since the boss 91B according to the comparative form 2 has the cap fitting portion 96 secured at the other end portion, the height of the boss is equivalent to the boss 91A according to the comparative form 1 by the amount of the cap fitting part 96. Has increased.

  Specifically, the total height of the boss 91A according to the comparative example 1 shown in FIG. 10A is the sum H1 + H2 of the height H1 of the outer peripheral surface 93 and the height H2 of the cap fitting portion 95. On the other hand, the total height of the boss 91B according to the comparative form 2 shown in FIG. 10B is the height H1 of the outer peripheral surface 93, the height H2 of the cap fitting portion 95, and the height H2 of the cap fitting portion 96. The sum is H1 + H2 + H2.

  For this reason, the railroad vehicle air conditioner airflow forming member 90 </ b> B according to the comparative example 2 cannot secure a sufficient gap with the surrounding members. Specifically, as shown in FIG. 1B, it is desirable to secure an interval equal to or greater than a predetermined safety distance XS between the railcar air conditioner airflow forming member 60 and the top plate 12. However, the railroad vehicle air conditioner airflow forming member 90B shown in FIG. 10B cannot secure the safe distance XS with the top plate 12 because the height of the boss 91B is too large.

  In FIG. 1B, if the distance between the top plate 12 and the bottom surface 11a is large, a safety distance XS is secured between the rail vehicle air conditioner airflow forming member 90B shown in FIG. 10B and the top plate 12. obtain. However, in a railway vehicle, since it is required to reduce the height of the outdoor unit room R1, it is not desirable to increase the distance between the top plate 12 and the bottom surface 11a.

  In FIG. 10B, if the height H1 of the outer peripheral surface 93 of the boss 91B is decreased, an increase in the overall height of the boss 91B can be suppressed. However, if the height H1 of the outer peripheral surface 93 is reduced, the boss 91B may not be able to hold the impeller 97 stably.

  This is because the impeller 97 is fixed to the boss 91 </ b> B in a state where the outer peripheral surface 93 is pressed toward the rotation shaft 31 of the motor 30, that is, radially inward, and the height H <b> 1 of the outer peripheral surface 93 is reduced. This is because the force with which the impeller 97 presses the boss 91B is reduced. For this reason, it is not desirable to reduce the height H1 of the outer peripheral surface 93.

  Based on the problem of the comparative example 2 described above, the description returns to the description of the present embodiment with reference to FIG.

  As shown in FIG. 2, the railway vehicle air conditioner airflow forming member 60 according to this embodiment includes a boss 40 and an impeller 50 fixed to the boss 40. The boss 40 is formed with a through hole 41 into which the rotating shaft 31 of the motor 30 shown in FIGS. 1A and 1B is inserted.

  The boss 40 is fitted to the rotation shaft 31 in a state where the rotation shaft 31 is inserted into the through hole 41 and is rotated by the motor 30. The impeller 50 has a plurality of wings projecting radially outward from the boss 40, and generates an airflow by rotating together with the boss 40.

  The boss 40 has a plurality of protrusions 42A that protrude outward in the radial direction. The protrusions 42 </ b> A are discretely arranged at intervals in the circumferential direction around the rotation shaft 31 of the motor 30, and prevent the impeller 50 from rotating relative to the boss 40 around the rotation shaft 31.

  The boss 40 has an outer peripheral surface 43 extending in the circumferential direction around the rotation shaft 31 of the motor 30. A part of the outer peripheral surface 43 is constituted by a protruding portion 42A. The height of the outer peripheral surface 43 is H1, and the impeller 50 is fixed to the boss 40 in a state in which the outer peripheral surface 43 of the boss 40 is pressed inward in the radial direction over the entire height. It is.

  The boss 40 is provided at one end portion in the height direction parallel to the rotation shaft 31 of the motor 30 and is provided at the cap fitting portion 44 that fits the cap 70 and at the other end portion in the height direction of the boss 40. And a cap fitting portion 45 that fits with the cap 70. The point that the height of each of the cap fitting portions 44 and 45 is H2 is the same as that of the comparative embodiment 2.

  In the boss 40 according to this embodiment, a circumferential groove 46 is formed between the peripheral edge of the opening of the through hole 41 at one end in the height direction and the outer peripheral surface 43, and the through hole 41 at the other end in the height direction. The greatest feature is that a circumferential groove 47 is also formed between the peripheral edge of the opening and the outer peripheral surface 43. Each of the circumferential grooves 46 and 47 extends in the circumferential direction around the rotation shaft 31 of the motor 30.

  Each of the circumferential grooves 46 and 47 has a depth in a direction parallel to the height direction of the boss 40. Specifically, at one end of the boss 40, the depth of the peripheral groove 46 from the peripheral end region 48 between the outer peripheral surface 43 and the outer peripheral edge of the peripheral groove 46 is DP. Further, at the other end of the boss 40, the depth of the peripheral groove 47 from the peripheral end region 49 between the outer peripheral surface 43 and the outer peripheral edge of the peripheral groove 47 is also DP.

  FIG. 2 illustrates a case where the boss 40 is fitted to the rotary shaft 31 in a direction in which the other end of the boss 40 faces the motor 30. In this case, as shown in FIG. 2, a cap 70 that covers the opening of the through hole 41 at one end is fitted into the circumferential groove 46 at one end of the boss 40.

  Thereby, as shown in FIG. 1B, the outdoor blower 24 can perform the bottom blowing in a state where water, dust, and the like are prevented from entering from the opening of the through hole 41 at one end.

  On the other hand, when the airflow forming member 60 for a railway vehicle air conditioner is turned upside down, that is, when the boss 40 is fitted to the rotating shaft 31 in a direction where one end of the boss 40 faces the motor 30, the other end of the boss 40 A cap 70 that covers the opening of the through hole 41 at the other end is fitted into the circumferential groove 47.

  Thereby, as shown in FIG. 1A, the outdoor blower 24 can perform top blowing in a state where water, dust, and the like are prevented from entering from the opening of the through hole 41 at the other end.

  In this way, since the cap 70 can be fitted into either the circumferential groove 46 at one end of the boss 40 or the circumferential groove 47 at the other end, the airflow forming member 60 for a railway vehicle air conditioner can be It is possible to deal with any of the bottom blowing, and in any case, it is possible to prevent water, dust and the like from entering the through hole 41.

  The circumferential groove 46 surrounds the cap fitting portion 44, and the cap fitting portion 44 rises from the bottom surface of the circumferential groove 46. Similarly, the circumferential groove 47 surrounds the cap fitting portion 45, and the cap fitting portion 45 rises from the bottom surface of the circumferential groove 47. For this reason, an increase in the height of the boss 40 is suppressed by the sum of the depth of the circumferential groove 46 at one end and the depth of the circumferential groove 47 at the other end.

  Specifically, the height of the boss 91B according to the comparative form 2 shown in FIG. 10B is H1 + H2 + H2, whereas the height of the boss 40 according to the present embodiment is suppressed to H1 + H2 + H2- (DP + DP). Therefore, the airflow forming member 60 for a railway vehicle air conditioner according to the present embodiment is not only less likely to come into contact with other members even when used upside down, and as shown in FIG. A safe distance XS can be secured during

  Details of the boss 40 will be described with reference to FIG. At one end of the boss 40, the radial width WD of the peripheral end region 48 between the outer peripheral surface 43 and the outer peripheral edge of the peripheral groove 46 perpendicular to the rotation shaft 31 of the motor 30 is from the peripheral end region 48. The circumferential groove 46 is designed to have a depth DP or more. Also at the other end of the boss 40, the radial width WD of the peripheral end region 49 between the outer peripheral surface 43 and the outer peripheral edge of the peripheral groove 47 is equal to or greater than the depth DP of the peripheral groove 47 from the peripheral end region 49. Designed to.

  As a result, despite the formation of the circumferential grooves 46 and 47, portions of the boss 40 that receive a radial inward force from the impeller 50 through the outer circumferential surface 43, particularly the circumferential grooves 46 and 47 and the outer circumferential surface 43. Sufficient durability is given to the part between.

  In the present embodiment, the cap fitting portion 44 is formed with a concave portion 44a having a depth in the radial direction and extending in the circumferential direction. The convex part 70a which protrudes in the radial direction and is formed in the cap 70 shown in FIG. 2 fits into the concave part 44a. Similarly, the other cap fitting portion 45 is formed with a recess 45a having a depth in the radial direction and extending in the circumferential direction. The convex part 70a of the cap 70 shown in FIG. 2 can also be fitted into the concave part 45a.

  Thus, since the convex part 70a of the cap 7 and the concave part 44a or 45a of the boss 40 are fitted, the cap 70 is not easily detached from the boss 40 even during rotation of the boss 40.

[Embodiment 2]
In the first embodiment, the boss 40 has the concave portions 44a and 45a, and the cap 70 has the convex portion 70a. However, the boss 40 has a convex portion protruding in the radial direction, and the concave portion is fitted with the convex portion. The cap 70 may have. Specific examples thereof will be described below.

  As shown in FIG. 7, in the present embodiment, the cap fitting portion 44 is formed with a convex portion 44 b that protrudes outward in the radial direction and extends in the circumferential direction. A concave portion (not shown) formed in the cap 70 is fitted into the convex portion 44b. Similarly, the other cap fitting portion 45 is formed with a convex portion 45b protruding outward in the radial direction and extending in the circumferential direction. A concave portion (not shown) formed in the cap 70 is also fitted to the convex portion 45b.

  Even in the configuration of the present embodiment, the convex portion 44b or 45b of the boss 40 and the concave portion (not shown) of the cap 70 are fitted, so that the cap 70 is unlikely to come off the boss 40.

[Embodiment 3]
In the first embodiment, as shown in FIG. 2, the cross section of the projecting portion 42 </ b> A that transmits torque to the impeller 50 parallel to the rotation shaft 31 of the motor 30 is formed in a rectangular shape. The shape is not particularly limited as long as torque can be transmitted to the impeller 50. Hereinafter, a specific example in which the shape of the protruding portion 42A is modified will be described.

  As shown in FIG. 8, in the present embodiment, the cross section of the protrusion 42 </ b> B that transmits torque to the impeller 50 parallel to the rotation shaft 31 of the motor 30 is formed in a smoothly curved mountain shape. Thus, by making the protrusion 42B have a smoothly curved shape, it is difficult for stress to concentrate on the protrusion 42B.

[Embodiment 4]
In the first embodiment, as shown in FIG. 2, when the cap 70 is fitted to one cap fitting portion 44, no other member is fitted to the other cap fitting portion 45. Of the cap fitting portions 44 and 45, a member other than the cap 70 may be fitted to the side where the cap 70 is not fitted. Specific examples thereof will be described below.

  As shown in FIG. 9, in the present embodiment, the ring member 80 is fitted to the cap fitting portion 44 and 45 that is not fitted with the cap 70. The ring member 80 is formed in a ring shape that fills the circumferential groove 46 and 47 where the cap 70 is not fitted and releases the opening of the through hole 41.

  According to the present embodiment, since the ring member 80 fills the circumferential groove 46 and 47 where the cap 70 is not fitted, the fatigue of the boss 40 against the radial stress orthogonal to the rotation shaft 31 of the motor 30 is reduced. can do.

  Since the ring member 80 releases the opening of the through hole 41, the insertion of the rotating shaft 31 of the motor 30 into the through hole 41 is not hindered.

  In addition, the ring member 80 is formed with a convex portion 80 a protruding in the radial direction, like the convex portion 70 a of the cap 70. As shown in FIG. 3, a recess 44 a is formed in the cap fitting portion 44, and a recess 45 a is formed in the cap fitting portion 45. Each of the concave portions 44 a and 45 a is used not only for fitting with the convex portion 70 a of the cap 70 but also for fitting with the convex portion 80 a of the ring member 80.

  Thus, since the convex part 80a of the ring member 80 fits into the concave part 44a or 45a of the boss 40, the ring member 80 is less likely to rattle in a direction parallel to the rotation shaft 31 of the motor 30.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this. The following modifications are possible.

  1A and 1B exemplify a case where the rotating shaft 31 of the motor 30 is oriented in the vertical direction and the outdoor blower 24 performs top blowing and bottom blowing. However, the rotating shaft 31 of the motor 30 does not necessarily have the vertical direction. It does not have to be suitable. Further, the direction of the air flow formed by the outdoor blower 24 may not be the vertical direction, and may be the horizontal direction or the oblique direction. Moreover, the installation location of the outdoor unit room R1 is not necessarily the roof portion of the railway vehicle, and may be under the floor.

  FIG. 2 illustrates the case where the depth DP of one circumferential groove 46 and the depth DP of the other circumferential groove 47 are equal, but the circumferential groove 46 and the circumferential groove 47 may have different depths. Good.

  Although FIG. 4 illustrates the impeller 50 having three blades, the number of blades included in the impeller 50 is not particularly limited. The impeller 50 may have only two wings, or may have four or more wings.

  9 illustrates a configuration in which the convex portion 70a is formed on the cap 70, the convex portion 80a is formed on the ring member 80, and the concave portions 44a and 45a are formed on the boss 40. Each of them may be formed with a concave portion that is recessed in the radial direction, and a convex portion that fits into the concave portion may be formed on the boss 40. That is, it is only necessary that a convex portion protruding in the radial direction is formed on one of the cap 70 and the ring member 80 and the cap fitting portions 44 and 45 and a concave portion that fits the convex portion is formed on the other.

  DESCRIPTION OF SYMBOLS 10 ... Housing | casing, 11 ... Base frame, 11a ... Bottom surface, 12 ... Top plate, 13 ... Partition plate, 14 ... 1st ventilation hole, 15, 16 ... 2nd ventilation hole, 20 ... Air-conditioning equipment, 21 ... Outdoor heat Exchanger, 21a ... first outdoor heat exchanger, 21b ... second outdoor heat exchanger, 22 ... cooperating device group, 22a ... expander, 22b ... indoor heat exchanger, 22c ... gas-liquid separator, 22d ... compression 23 ... Indoor fan, 24 ... Outdoor fan, 30 ... Motor, 31 ... Rotating shaft, 40 ... Boss, 41 ... Through hole, 42A, 42B ... Projection, 43 ... Outer peripheral surface, 44 ... Cap fitting part, 44a ... concave part, 44b ... convex part, 45 ... cap fitting part, 45a ... concave part, 45b ... convex part, 46, 47 ... peripheral groove, 48, 49 ... peripheral edge part region, 50 ... impeller, 60 ... railway vehicle air conditioning Airflow forming member for machine (airflow forming member), 70 ... cap, 70a ... convex part, 80 ... ring Material: 80a ... convex part, 90A, 90B ... airflow forming member for railway vehicle air conditioner, 91A, 91B ... boss, 92 ... through hole, 93 ... outer peripheral surface, 94 ... projecting part, 95, 96 ... cap fitting part, 97 ... Impeller, 100 ... Railroad vehicle air conditioner, BM ... Bellmouth, R1 ... Outdoor unit room, R2 ... Indoor unit room.

Claims (3)

The motor has an outer peripheral surface extending in the circumferential direction around the rotation shaft of the motor, and has a through hole into which the rotation shaft is inserted. The rotation shaft is inserted into the through hole in the state where the rotation shaft is inserted. A boss that is fitted and rotated by the rotating shaft;
An impeller that is fixed to the boss in contact with the outer peripheral surface of the boss, and generates an airflow by rotating together with the boss;
With
At each of one end and the other end of the boss in the height direction parallel to the rotation axis, a depth is set in a direction parallel to the height direction between the peripheral edge of the opening of the through hole and the outer peripheral surface. And a circumferential groove extending in the circumferential direction is formed,
When the boss is fitted to the rotating shaft in a direction where the one end faces the motor, a cap that covers the opening at the other end is fitted into the circumferential groove at the other end, while the other end is When the boss is fitted to the rotating shaft in a direction facing the motor, the cap covering the opening at the one end is fitted into the circumferential groove at the one end.
Airflow forming member. In each of the one end and the other end of the boss, a radial width perpendicular to the rotation axis of the peripheral end region between the outer peripheral surface and the outer peripheral edge of the peripheral groove is the peripheral end region. More than the depth of the circumferential groove from
The airflow forming member according to claim 1. An outdoor heat exchanger that has a structure in which a refrigerant circulates inside and performs heat exchange with air;
The airflow forming member according to claim 1, the motor that rotates the boss of the airflow forming member, and the cap that covers the opening, and the air is taken in and taken in from the outside of the railway vehicle. An outdoor blower that forms an air flow that passes air through the outdoor heat exchanger and is discharged to the outside of the railway vehicle;
A collaborative device group that constitutes a refrigeration cycle together with the outdoor heat exchanger using the refrigerant;
A rail vehicle air conditioner.