JP2019190332A - Impeller and fluid pump - Google Patents

Abstract

To provide an impeller in which a plurality of blade parts and a second disc part can be rigidly fixed while improving fluid transportation efficiency.SOLUTION: An impeller 16 comprises: a first disc part 50; a plurality of blade parts 52 which are spirally and radially formed at one side of the first disc part 50 in an axial direction with a center part of the first disc part 50 as a center; and a second disc part 54 arranged at axial one side of the first disc part 50 while opposing the first disc part 50, and abutting on the plurality of blade parts 52. Hole parts 56 opened at a side of the first disc part 50 are formed in the second disc part 54. Protrusions 58 are integrally formed at some blade parts 52 out of the plurality of blade parts 52. The width of each of the protrusions 58 is larger than thicknesses of the blade part 52. The protrusion 58 extends to a side of the second disc part 54 from the first disc part 50, and the distal end of each of the protrusions 58 is fit into the hole part 56.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an impeller and a fluid pump.

  Conventionally, as an impeller used for a fluid pump, there are the following (for example, refer to Patent Documents 1 to 3). That is, the impeller includes a first disk part, a plurality of blade parts formed in a spiral shape around the central part of the first disk part on one axial surface of the first disk part, and the first disk There is one provided with a second disk part that is disposed on one side in the axial direction of the part so as to face the first disk part and is assembled to a plurality of blade parts. In such an impeller, some of the plurality of blade portions are integrally formed with a protruding portion that protrudes toward the second disk portion, and the protruding portion is fitted into the hole of the second disk portion. Thus, the second disk portion is assembled to the plurality of blade portions.

Japanese Utility Model Publication No. 55-142893 Japanese Patent No. 4819570

  In the impeller as described above, if the blade portion is configured to be thin, the volume in the impeller can be ensured, so that the fluid conveyance efficiency can be improved. However, in order to firmly fix the plurality of blade portions and the second disk portion, it is necessary to secure the width of the convex portion.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the impeller which can fix a some blade | wing part and a 2nd disk part firmly, improving fluid conveyance efficiency.

  The impeller according to claim 1 includes a first disc portion and a plurality of blade portions that are formed in a spiral shape around the central portion of the first disc portion on a surface on one axial side of the first disc portion. A second disk part disposed on one side in the axial direction of the first disk part so as to face the first disk part, abutting against the plurality of blade parts, and the second disk part, A hole that opens to the side of the one disk part, and is formed integrally with several of the plurality of blade parts, and wider than the thickness of the blade part, and the first disk A projecting portion extending from the portion toward the second disk portion and having a tip portion fitted in the hole portion.

  According to this impeller, the convex part is formed wider than the thickness of the blade part. Therefore, since the width of the convex portion is ensured, the plurality of blade portions and the second disk portion can be firmly fixed.

  In other words, the blade part is formed thinner than the width of the convex part. Therefore, since the volume in the impeller can be ensured, the fluid conveyance efficiency can be improved.

  In addition, as described in claim 2, in the impeller according to claim 1, the convex portion has a protruding portion that protrudes laterally from a concave curved side surface of the blade portion, and a convex curve in the blade portion. You may be located in the side of the said concave curved side surface rather than a side surface.

  According to this impeller, the convex portion has a protruding portion that protrudes laterally (inward) from the concave curved side surface of the blade portion, but the entire convex portion has a concave curved side surface rather than the convex curved side surface of the blade portion. Located on the side. Therefore, even if the width of the convex portion is ensured, the convex curved side surface can be flattened because the convex portion does not protrude laterally (outside) from the convex curved side surface of the blade portion. Thereby, it can suppress that the flow of the fluid along a convex curve side surface is inhibited.

  According to a third aspect of the present invention, there is provided a fluid pump according to the first or second aspect, a pump chamber that houses the impeller, a rotor that rotates integrally with the impeller, and a rotating magnetic field applied to the rotor. And a stator to be formed.

  According to this fluid pump, the plurality of blade portions and the second disk portion of the impeller can be firmly fixed while improving the fluid conveyance efficiency of the impeller, so that the performance can be improved.

It is a longitudinal cross-sectional view of the fluid pump which concerns on one Embodiment of this invention. It is a perspective view of the impeller member of FIG. It is a disassembled perspective view of the impeller member of FIG. It is a perspective view of the 1st disk part of FIG. 2, and a some blade | wing part. It is a top view of the 1st disk part of Drawing 2, and a plurality of wing parts.

  Hereinafter, a first embodiment of the present invention will be described.

  As shown in FIG. 1, the fluid pump 10 according to this embodiment includes a stator 12, a rotor 14, an impeller 16, a motor shaft 18, a motor housing 20, a pump housing 22, an end housing 24, And a circuit board 26. Arrow A <b> 1 indicates one axial side of the fluid pump 10, and arrow A <b> 2 indicates the other axial side of the fluid pump 10.

  The stator 12 includes a stator core 30, an insulator 32, a winding 34, and a stator holder 36. The stator core 30 has a plurality of teeth portions 31 extending radially. The insulator 32 is attached to the stator 12, and the winding 34 is wound around the tooth portion 31 via the insulator 32. The stator holder 36 is formed in a cylindrical cylindrical shape, and has a cylindrical portion 37 and a top wall portion 38. A stator core 30 is press-fitted inside the cylindrical portion 37. The stator 12 is formed in a substantially annular shape as a whole, and is disposed opposite to the rotor 14 on the radially outer side of the rotor 14 described later.

  The rotor 14 has a main body 40, a bearing 42, a rotor magnet 44, and a rotor core 46. The main body 40 is made of resin and is formed in a substantially cylindrical shape. The bearing 42 is provided on the inner periphery of the main body 40, and the rotor core 46 is provided on the outer periphery of the main body 40. The rotor core 46 has a double cylindrical structure having an inner peripheral portion and an outer peripheral portion, and the rotor magnet 44 is provided between the inner peripheral portion and the outer peripheral portion of the rotor core 46.

  The rotor 14 is formed in a substantially cylindrical shape as a whole (a substantially columnar shape having a hole in the shaft core portion). The motor shaft 18 is inserted inside the bearing 42, and the rotor 14 is rotatably supported by the motor shaft 18. The rotor 14 (rotor magnet 44) is disposed on the radially inner side of the stator 12 so as to face the stator 12. The rotor 14 constitutes a motor unit together with the stator 12.

  The impeller 16 is disposed on one side of the rotor 14 in the axial direction. The impeller 16 is made of resin as an example, and includes a first disk part 50, a plurality of blade parts 52, and a second disk part 54. The first disk part 50 and the second disk part 54 are formed with the axial direction of the impeller 16 as the plate thickness direction. The second disk portion 54 is disposed on one axial side of the first disk portion 50 and faces the first disk portion 50.

  The plurality of blade parts 52 are disposed between the first disk part 50 and the second disk part 54. That is, the impeller 16 is a closed impeller in which both sides in the axial direction of the plurality of blade portions 52 are closed by the disk portions. The impeller 16 constitutes an impeller member 80 together with the rotor 14. A more detailed structure of the impeller 16 will be described later.

  The motor housing 20 has a double structure having an inner cylinder portion 60 and an outer cylinder portion 62, both of which are cylindrical. The inner cylinder part 60 opens on one axial side of the motor housing 20, and the outer cylinder part 62 opens on the other axial side of the motor housing 20. The rotor 14 is rotatably accommodated inside the inner cylinder part 60, and the stator 12 is accommodated between the inner cylinder part 60 and the outer cylinder part 62.

  An end of the inner cylinder portion 60 opposite to the impeller 16 is closed by a bottom wall portion 64. The bottom wall portion 64 is formed with a concave shaft support portion 66 that opens to one side in the axial direction of the motor housing 20. The shaft support portion 66 is disposed along the axial direction of the fluid pump 10. The motor shaft 18 is press-fitted. A connecting wall portion 68 is formed between the inner cylindrical portion 60 and the outer cylindrical portion 62, and the end portions on the impeller 16 side of the inner cylindrical portion 60 and the outer cylindrical portion 62 are connected by the connecting wall portion 68. Has been.

  The pump housing 22 is arranged on one side in the axial direction of the motor housing 20 and is assembled to the motor housing 20. The pump housing 22 is formed in a concave shape that opens to the connecting wall portion 68 side. A space surrounded by the connecting wall portion 68 and the concave pump housing 22 is formed as a pump chamber 70, and the impeller 16 is rotatably accommodated in the pump chamber 70.

  The pump housing 22 has an inlet pipe 72 and an outlet pipe 74. The inlet pipe 72 extends from the center of the pump housing 22 in the axial direction of the pump housing 22, and the outlet pipe 74 extends from the outer periphery of the pump housing 22 in the tangential direction of the pump housing 22. The inlet pipe 72 is formed with a suction port 76 communicating with the pump chamber 70, and the outlet pipe 74 is formed with a discharge port 78 communicating with the pump chamber 70.

  The end housing 24 is disposed on the other axial side of the motor housing 20 and is assembled to the stator holder 36 and the motor housing 20. The end housing 24 is formed in a concave shape that opens to the motor housing 20 side.

  The circuit board 26 is disposed on the other axial side of the stator 12 and the rotor 14, and is accommodated in the end housing 24. A terminal portion of a winding 34 extending from the stator 12 is connected to the circuit board 26. The circuit board 26 is mounted with a motor driver for supplying current to the winding 34, a control element for controlling the motor driver, and the like.

  In the fluid pump 10, when a rotating magnetic field is formed by the stator 12, a suction and repulsive force acts on the rotor magnet 44 and the rotor 14 rotates. Further, the impeller 16 rotates integrally with the rotor 14. Then, the fluid is sucked from the suction port 76 of the inlet pipe 72, and this fluid flows into the impeller 16. The fluid that has flowed into the pump chamber 70 inside the impeller 16 is discharged to the outside from the outlet discharge port 78.

  Next, the detailed structure of the impeller 16 will be described. As shown in FIGS. 2 and 3, the plurality of blade portions 52 are formed on the surface on the one axial side of the first disk portion 50. The plurality of blade portions 52 are formed in a spiral shape with the central portion of the first disk portion 50 as the center. The second disk part 54 is configured separately from the first disk part 50 and the plurality of blade parts 52.

  The upper end portions in the height direction of the plurality of blade portions 52 are formed as contact portions 52A. In the state where the second disk portion 54 is assembled to the plurality of blade portions 52, the contact portions 52A It contacts the disk part 54. The impeller 16 includes a plurality of hole portions 56 and a plurality of convex portions 58 as a configuration for assembling the second disk portion 54 to the plurality of blade portions 52.

  The plurality of holes 56 are formed in the second disk portion 54. The plurality of hole portions 56 are arranged at equal intervals on the same circumference of the second disk portion 54. Each hole 56 penetrates in the axial direction of the second disk part 54 as an example of “a hole opening on the first disk part side”. The plurality of convex portions 58 are formed integrally with some blade portions 52 among the plurality of blade portions 52. The convex portion 58 extends from the first disc portion 50 to the second disc portion 54 side. The front end 58A of the convex portion 58 protrudes from the contact portion 52A toward the second disk portion 54.

  The plurality of convex portions 58 are formed at positions corresponding to the plurality of hole portions 56, and are arranged at equal intervals on the same circumference of the first disk portion 50. And the front-end | tip part 58A of the some convex part 58 is each fitted with the several hole part 56, and the 2nd disc part 54 is made into a plurality by the welding of the front-end | tip part 58A with the hole part 56 after that, for example. The blade portion 52 is fixed.

  As shown in FIGS. 4 and 5, the plurality of blade portions 52 have the same shape. The plurality of blade portions 52 are shaped on the assumption that the impeller 16 rotates to one side, as indicated by an arrow R.

  That is, each blade portion 52 has a curved shape so as to protrude toward the front side in the rotation direction of the impeller 16. The outer side surface of each blade portion 52, that is, the side surface located on the front side in the rotation direction of the impeller 16 in each blade portion 52 is formed as a convex curved side surface 52 </ b> B that becomes the positive pressure side when the impeller 16 rotates.

  The inner side surface of each blade portion 52, that is, the side surface located on the rear side in the rotation direction of the impeller 16 in each blade portion 52 is formed as a concave curved side surface 52 </ b> C that becomes a negative pressure side when the impeller 16 rotates. The convex curved side surface 52B is formed to be curved so as to be convex toward the front side in the rotational direction of the impeller 16, and the concave curved side surface 52C is configured to be concaved toward the front side in the rotational direction of the impeller 16. It is curved.

  By the way, in the impeller 16 of such a fluid pump 10, when the blade | wing part 52 is comprised thinly, since the volume in the impeller 16 can be ensured, fluid conveyance efficiency can be improved. However, in order to firmly fix the plurality of blade portions 52 and the second disk portion 54, it is necessary to secure the width of the convex portion 58.

  Here, it is conceivable to secure the width of the convex portion 58 while making the blade portion 52 thin. In this case, the convex portion 58 protrudes from the convex curved side surface 52B of the blade portion 52 to the side (outside). It is possible. However, since the convex curved side surface 52B in the blade portion 52 is a positive pressure surface through which fluid flows along the blade portion 52, when the convex portion 58 protrudes laterally from the convex curved side surface 52B in the blade portion 52, as described above. There is a possibility that the flow of fluid along the convex curved side surface 52B may be hindered.

  Therefore, the impeller 16 according to the present embodiment has the following structure. That is, the convex portion 58 is formed wider than the thickness of the blade portion 52. The thickness of the blade portion 52 is the length between the convex curved side surface 52B and the concave curved side surface 52C. The convex portion 58 protrudes laterally (inward) from the concave curved side surface 52C of the blade portion 52, but is positioned closer to the concave curved side surface 52C than the convex curved side surface 52B of the blade portion 52. That is, a part of the convex portion 58 protrudes as the protruding portion 58B on the concave curved side surface 52C, but the convex curved side surface 52B is a flat surface on which the convex portion 58 does not protrude. The protruding portion 58B corresponds to the proximal end portion of the convex portion 58 that connects the first disc portion 50 and the distal end portion 58A.

  Next, the operation and effect of this embodiment will be described.

  As described above in detail, according to the impeller 16 according to the present embodiment, the convex portion 58 is formed wider than the thickness of the blade portion 52. Therefore, since the width of the convex portion 58 is ensured, the plurality of blade portions 52 and the second disk portion 54 can be firmly fixed.

  In other words, the blade portion 52 is formed thinner than the width of the convex portion 58. Therefore, since the volume in the impeller 16 can be secured, the fluid conveyance efficiency can be improved.

  Furthermore, although the convex part 58 has the protrusion part 58A which protrudes to the side (inner side) from the concave curved side surface 52C in the blade | wing part 52, it is located in the said concave curved side surface side rather than the convex curved side surface 52B in the blade | wing part 52. . Therefore, even if the width of the convex portion 58 is ensured, the convex curved side surface 52B can be flattened because the convex portion 58 does not protrude laterally (outside) from the convex curved side surface 52B of the blade portion 52. Thereby, it can suppress that the flow of the fluid along the convex curved side surface 52B is inhibited.

  Further, according to the fluid pump 10 according to the present embodiment, the plurality of blade parts 52 and the second disk part 54 of the impeller 16 can be firmly fixed while improving the fluid conveyance efficiency of the impeller 16, thereby improving performance. Can be made.

  Next, a modification of this embodiment will be described.

  In the above embodiment, the convex portion 58 is welded to the hole portion 56, but may be simply press-fitted into the hole portion 56 without being welded.

  Moreover, in the said embodiment, although the hole part 56 is penetrated and formed in the 2nd disk part 54, for example, when the convex part 58 is press-fit in the hole part 56, the hole part 56 is the 1st disk. You may form in the concave shape opened to the part 50 side.

  In the above embodiment, the impeller 16 is formed integrally with the rotor 14. However, the impeller 16 may be configured separately from the rotor 14 and fixed so as to be rotatable integrally with the rotor 14.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 ... Fluid pump, 12 ... Stator, 14 ... Rotor, 16 ... Impeller, 18 ... Motor shaft, 20 ... Motor housing, 22 ... Pump housing, 24 ... End housing, 26 ... Circuit board, 30 ... Stator core, 31 ... Teeth part 32 ... Insulator, 34 ... Winding, 36 ... Stator holder, 37 ... Cylindrical part, 38 ... Top wall part, 40 ... Body part, 42 ... Bearing, 44 ... Rotor magnet, 46 ... Rotor core, 50 ... First disc 52, blade portion, 52A, contact portion, 52B, convex curved side surface, 52C, concave curved side surface, 54 ... second disk portion, 56 ... hole portion, 58 ... convex portion, 58A ... tip portion, 58B ... projecting , 60 ... inner cylinder part, 62 ... outer cylinder part, 64 ... bottom wall part, 66 ... shaft support part, 68 ... coupling wall part, 70 ... pump chamber, 72 ... inlet pipe, 74 ... outlet pad Flop, 76 ... inlet, 78 ... discharge port, 80 ... impeller member

Claims (3)

The first disk part,
A plurality of blade portions formed in a spiral shape around the central portion of the first disc portion on the surface on one side in the axial direction of the first disc portion;
A second disk part disposed on one side in the axial direction of the first disk part so as to face the first disk part, and in contact with the plurality of blade parts;
A hole formed in the second disk portion and opening on the first disk portion side;
The blades are formed integrally with several blades of the plurality of blades, are wider than the blades, and extend from the first disk to the second disk. A convex portion having a tip portion fitted in the hole portion;
Impeller with. The convex portion has a protruding portion that protrudes laterally from the concave curved side surface of the blade portion, and is located on the concave curved side surface side of the convex curved side surface of the blade portion.
The impeller according to claim 1. The impeller according to claim 1 or 2,
A pump chamber for housing the impeller;
A rotor that rotates integrally with the impeller;
A stator that forms a rotating magnetic field with respect to the rotor;
A fluid pump comprising: