JP2022062796A - Pump device - Google Patents

Abstract

To provide a pump device comprising an impeller easy to weld.SOLUTION: In a pump device 1 according to an embodiment, an impeller 3 comprises: a circular first plate 31; a plurality of blade parts 32 protruding on one side from the first plate 31, and arranged at regular intervals in a circumferential direction; and a circular second plate 33 in contact with tip parts 321 on the one side of the blade parts 32. The second plate 33 comprises a first surface 331 facing the one side, and a second surface 335 facing the side opposite to the first surface 331. The first surface 331 comprises a flat surface part 332 that is a flat surface orthogonal to a rotation center axis direction, in an outer peripheral portion. The second surface 335 comprises a second surface side inclined part 336 that is an inclined surface approaching the first plate 31 toward the outside in a radial direction from the inside in the radial direction. The second surface 335 and the tip parts 321 are welded at positions overlapping with the flat surface part 332 in an axial direction.SELECTED DRAWING: Figure 7

Description

The present invention relates to a pump device including an impeller having a plurality of blades provided between a pair of circular plates.

In the pump device, the impeller arranged in the pump chamber is rotated by a motor. Such a pump device is described in, for example, Patent Document 1. In the same document, a resin impeller is arranged on one side in the axial direction in which the rotation center axis of the rotor extends. More specifically, the impeller includes a first disk portion integrally formed with the rotor, a blade protruding unilaterally from the first disk portion, and a second disk portion abutting on the tip of the blade. In the second disk portion, the entire surface on one side in the axial direction and the entire surface on the other side in the axial direction are composed of inclined surfaces inclined so that the inner side in the radial direction is located on one side of the outer side in the radial direction.

Japanese Unexamined Patent Publication No. 2018-108024

The impeller of the pump device described in Patent Document 1 has a problem that it is not easy to connect the second disk portion and the brate because the entire surfaces of both sides of the second disk portion are formed of inclined surfaces. For example, when the second disk portion and the brate are bonded by a method such as adhesion or welding, it is necessary to press the second disk portion toward the blade, but at that time, the second disk portion is pressed through the inclined surface. Since the portion is pressed, the position of the second disk portion is likely to be displaced. In particular, when the second disk portion and the brate are joined by welding, it is necessary to press the welding head from one side against the second disk portion, so the second disk portion is positioned by a pressing jig or the like. It is necessary to keep it.

In view of the above problems, an object of the present invention is to provide a pump device including an impeller capable of easily connecting the first plate and the second plate via a blade portion.

In order to solve the above problems, the pump device according to the present invention is a resin that is arranged on one side of a motor provided with a rotor and the axis direction in which the rotation center axis of the rotor extends and rotates integrally with the rotor. The impeller is provided with an impeller made of steel and a case for partitioning a pump chamber for accommodating the impeller, and the impeller protrudes from the circular first plate and the first plate toward the one side, and the rotation center axis. The second plate is provided with a plurality of blade portions extending in the radial direction at a plurality of locations in the circumferential direction centered on the above, and a circular second plate to which the tip portions on one side of the plurality of blade portions abut. Includes a first surface facing the one side and a second surface facing the opposite side of the first surface, so that the radially inner side of the second surface is located on the one side of the radial outer side. The inclined portion on the second surface side inclined diagonally extends in the circumferential direction around the rotation center axis, and on the first surface, the plane portion orthogonal to the rotation center axis rotates around the rotation center axis. The second plate extends in the direction and is characterized in that the second plate is welded to the tip portion at a position where the plurality of blade portions and the flat surface portion overlap when viewed from the axial direction.

In the present invention, a slope portion is provided on the second surface of the second plate used for the impeller on the blade portion side, but the rotation of the rotor is provided on the first surface on the side opposite to the blade portion of the second plate. A plane portion orthogonal to the central axis is provided. Therefore, when the second plate and the tip end portion of the blade portion are joined by welding, the welding head of the welding device can be pressed against the flat surface portion, and the second plate can be pressed against the blade portion in the axial direction. Therefore, welding between the second plate and the tip end portion of the blade portion can be easily performed.

In the present invention, on the surface of the first plate opposite to the second plate, a plane orthogonal to the rotation center axis is provided in a region overlapping the plane portion when viewed from the axis direction. Can be adopted. According to such an embodiment, when welding the second plate and the tip end portion of the blade portion, the surface of the first plate opposite to the second plate can be easily supported.

In the present invention, the plurality of blades can be integrally formed with the first plate. According to such an embodiment, even when a fluid pressure is applied to the blade portion, the fluid pressure is applied to the side of the first plate. Therefore, the second plate is unlikely to fall off from the blade portion.

In the present invention, the rotor includes a magnet and a resin holder for holding the magnet, and the first plate is provided integrally with the holder at one end of the holder. Aspects can be adopted. According to this aspect, it is easy to integrate the rotor and the first plate.

In the present invention, the tip portion is oblique so that the first portion orthogonal to the axial direction and the radially inner side or the radial inner side of the first portion are located on one side of the radial outer side. The contacted portion of the second plate with which the first portion abuts is a surface orthogonal to the rotation center axis, and the first portion and the contacted portion are provided with a second portion inclined to. It is possible to adopt an embodiment in which and is welded. According to this aspect, since both the first portion and the contacted portion are planes orthogonal to the rotation center axis, welding can be reliably performed.

In the present invention, the second surface is provided with a groove including a first accommodating groove into which the first portion fits inward, and the contacted portion is formed by the bottom surface of the first accommodating groove. Can be adopted. According to this aspect, even if burrs are generated when the first portion and the contacted portion are welded, the burrs are not exposed to the outside from the first accommodating groove. Therefore, when the impeller rotates, it is possible to prevent the burr from peeling off from the impeller.

In the present invention, the groove includes a second accommodating groove into which the second portion fits inward, and the bottom surface of the second accommodating groove is slanted so that the radial inner side is located on one side of the radial outer side. An aspect of an inclined surface can be adopted. According to this aspect, when the first portion and the contacted portion are welded, even if burrs are generated at the boundary portion between the first portion and the second portion, the burrs are not exposed to the outside from the second accommodating groove. .. Therefore, when the impeller rotates, it is possible to prevent the burr from peeling off from the impeller.

In the present invention, the first portion can adopt an aspect provided on the radial outer side of the second portion.

In the present invention, it is possible to adopt an embodiment in which the radial outer end portion of the groove does not reach the outer peripheral edge of the second plate. According to this aspect, when the first portion and the contacted portion are welded, even if burrs are generated at the radially outer end portion of the first portion, the burrs are not exposed to the outside from the groove. Therefore, when the impeller rotates, it is possible to prevent the burr from peeling off from the impeller.

In the present invention, on the first surface, the first surface side inclined portion inclined so that the radial inner side is located on the one side of the radial outer side on the radial inner side or the radial outer side of the plane portion is the rotation center. Of the inner walls extending in the circumferential direction around the axis and partitioning the pump chamber of the case, the portion facing the impeller on one side is an inclined surface inclined along the inclined portion on the first surface side. Aspects including the above can be adopted. According to such an embodiment, it is possible to suppress the loss when the fluid in the pump chamber is moved by the impeller.

In the present invention, the opening area of the radial inner first opening sandwiched between the first plate and the second plate by two adjacent blades in the circumferential direction is defined as A, and the first plate is defined as the first plate. When the opening area of the second opening on the outer side in the radial direction sandwiched between the two plates and the second plate adjacent to each other in the circumferential direction is B, the opening areas A and B have the following conditions. Equation 1.2A ≤ B ≤ 1.5A
Aspects satisfying can be adopted. According to such an embodiment, the opening area of the second opening can be configured so as not to be extremely larger than the opening area of the first opening. As a result, it is possible to suppress a decrease in the efficiency of the pump device.

In the present invention, a slope portion is provided on the second surface of the second plate used for the impeller on the blade portion side, but the rotation of the rotor is provided on the first surface of the second plate opposite to the blade portion. A plane portion orthogonal to the central axis is provided. Therefore, when the second plate and the tip end portion of the blade portion are joined by welding, the welding head of the welding device can be pressed against the flat surface portion, and the second plate can be pressed against the blade portion in the axial direction. Therefore, welding between the second plate and the tip end portion of the blade portion can be easily performed.

It is a perspective view of the pump device to which this invention is applied. It is sectional drawing of the pump device shown in FIG. It is a perspective view of an impeller. It is sectional drawing of an impeller. It is an exploded perspective view which looked at the impeller from one side. It is an exploded perspective view which looked at the impeller from the other side. It is a figure which schematically explains the relationship between a blade part and a 2nd plate. It is an exploded perspective view of the impeller of the modification 1. FIG. It is a figure which schematically explains the relationship between the blade part and the 2nd plate in the modification 1. FIG.

Hereinafter, a pump device including an impeller according to the present invention will be described with reference to the drawings. In the following description, the extending direction of the rotation center axis L will be described as the axis direction. Further, in the axial direction, L1 is attached to one side and L2 is attached to the other side. Further, in the following description, the radial direction and the circumferential direction about the rotation center axis are simply referred to as "diameter direction" and "circumferential direction", respectively.

(overall structure)
FIG. 1 is a perspective view of a pump device 1 to which the present invention is applied. FIG. 2 is a cross-sectional view of the pump device 1 shown in FIG. As shown in FIGS. 1 and 2, the pump device 1 includes a motor 2 including a rotor 5 that rotates around a rotation center axis L, and a resin impeller arranged on one side L1 in the axial direction with respect to the rotor 5. 3 and a case 4 for partitioning the pump chamber 20 for accommodating the impeller 3. The pump device 1 moves the fluid in the pump chamber 20 by rotating the impeller 3 integrally with the rotor 5.

(motor)
The motor 2 includes a rotor 5, a stator 6 located radially outside the rotor 5, a resin partition wall member 7 that covers the stator 6, and a support shaft 8 that rotatably supports the rotor 5. The rotor 5 includes a cylindrical holder 51 extending in the axial direction and a cylindrical magnet 10 held on the outer peripheral surface of the holder 51.

The holder 51 is made of resin. The holder 51 has a small diameter portion 52 that holds the magnet 10 on the outer peripheral surface, a circular contact portion 53 that contacts the end of one side L1 of the magnet 10, and a protrusion from the outer peripheral edge of the contact portion 53 to one side L1. The large diameter portion 54 is provided, and the outer diameter dimension of the small diameter portion 52 is smaller than the outer diameter dimension of the large diameter portion 54. The small diameter portion 52 and the large diameter portion 54 are provided coaxially. The small diameter portion 52 holds a bearing 56 inside, and the rotor 5 is rotatably supported by a support shaft 8 via the bearing 56.

The magnet 10 is a neodymium bond magnet. The magnet 10 is entirely covered with a resin skin layer. The outer diameter dimension of the magnet 10 is substantially the same as the outer diameter dimension of the large diameter portion 54. By applying an adhesive between the magnet 10 and the small diameter portion 52, the magnet 10 and the small diameter portion 52 are adhered to each other. At this time, the magnet 10 is positioned by abutting the magnet 10 with the contact portion 53.

The stator 6 has a stator core 61 and a coil 63 wound around the stator core 61 via an insulator 62. Although detailed description will be omitted, the stator core 61 includes an annular portion extending in an annular shape and a plurality of salient poles protruding inward in the radial direction from the annular portion. The coil 63 is wound between the radial inner first flange portion 621 and the radial outer second flange portion 622 of the insulator 62 that covers the salient pole. In the present embodiment, the motor 2 is a three-phase motor, and the coil 63 includes a U-phase coil, a V-phase coil, and a W-phase coil.

The partition member 7 includes a first partition 71 facing L1 on one side, a second partition 72 interposed between the stator 6 and the magnet 10, and a third partition facing the end surface of L2 on the other side of the rotor 5. 73 and is provided. In the present embodiment, the partition wall member 7 is a resin sealing member that covers the stator 6 from both sides in the radial direction and both sides in the axial direction. The material of the partition wall member 7 is formed by, for example, insert molding the stator 6 with polyphenylene sulfide (PPS). Further, for example, the partition wall member 7 may be formed by insert molding the stator 6 with a BMC (Bulk Molding Compound) or the like.

The cover 15 is fixed to the end of the other side L2 of the partition member 7. A substrate 16 provided with a circuit or the like for controlling power supply to the coil 63 is arranged between the cover 15 and the partition wall member 7. Further, the partition wall member 7 is provided with a connector housing 76. The rotor 5 of the motor 2 rotates by connecting the connector to the connector housing 76 to supply power and the like. As a result, the impeller 3 rotates in the pump chamber 20.

The support shaft 8 is a metal rod-shaped member. The center axis of the support shaft 8 coincides with the rotation center axis of the rotor 5. The end of the other side L2 of the support shaft 8 is press-fitted into the hole 74 formed in the third partition wall 73. An annular plate member 81 is attached to the end of L1 on one side of the support shaft 8. The plate member 81 comes into contact with the end of L1 on one side of the bearing 56 protruding from the contact portion 53.

(Impeller)
FIG. 3 is a perspective view of the impeller 3. FIG. 4 is a cross-sectional view of the impeller 3. FIG. 5 is an exploded perspective view of the impeller 3 as viewed from one side L1. FIG. 6 is an exploded perspective view of the impeller 3 as viewed from the other side L2. FIG. 7 is a diagram schematically explaining the relationship between the blade portion 32 and the second plate 33. That is, the blade portion 32 extends in the radial direction while being curved in the circumferential direction.
In FIG. 7, the blade portion 32 is shown as extending linearly in the radial direction.

As shown in FIGS. 3 to 7, the impeller 3 includes a circular first plate 31 and a plurality of blade portions 32 protruding from the first plate 31 to L1 on one side and arranged at regular intervals in the circumferential direction. A circular second plate 33 that comes into contact with the tip portion 321 on one side L1 side of the blade portion 32 is provided. Each of the plurality of blade portions 32 has a plate shape with the thickness direction directed in the circumferential direction. The first plate 31 is integrally provided at the end of one side L1 of the large diameter portion 54 of the holder 51 of the rotor 5, and projects radially outward from the end on the one side L1 side. That is, the first plate 31 and the holder 51 of the rotor 5 are integrally formed of a resin material. A hole 310 is formed in the center of the first plate 31. In the present embodiment, the surface 311 on one side L1 of the first plate 31 and the surface 312 on the other side L2 are both planes orthogonal to the axial direction.

Seven blade portions 32 of this embodiment are provided in the circumferential direction. The blade portion 32 has a plate shape curved in the circumferential direction when viewed from the axial direction. In the blade portion 32, the side surface portion 324 on the inner side in the radial direction is located on the outer side in the radial direction from the hole portion 310. In the blade portion 32, the radial outer side surface portion 325 coincides with the outer peripheral surface of the first plate 31.

The tip portion 321 is inclined so that the first portion 323 orthogonal to the axial direction and the radial inner side of the first portion 323 are located on one side L1 from the radial outer side on the radial inner side or the radial outer side. It is equipped with two parts 322. In this embodiment, the first portion 323 is provided on the radial outer side of the second portion 322.

The second plate 33 has a circular plate shape. The second plate 33 has a hole 330 in the center. The second plate 33 includes a first surface 331 facing the one side L1 and a second surface 335 facing the other side L2 side. The first surface 331 includes a flat surface portion 332 that is a plane orthogonal to the axial direction, and the flat surface portion 332 extends in the circumferential direction. In the present embodiment, in the first surface 331, the circumferential direction of the first surface side inclined portion 333 inclined so that the radially inner side or the radial inner side of the flat surface portion 332 is located on one side L1 from the radial outer side. It is extended to. In the present embodiment, the flat surface portion 332 is provided in an annular shape on the radial outer side of the first surface side inclined portion 333, and the flat surface portion 332 is the first portion 323 of the blade portion 32 when viewed from the axial direction. Overlap.

In the second surface 335, the second surface side inclined portion 336 inclined diagonally so that the inner side in the radial direction is located on one side L1 from the outer side in the radial direction extends in the circumferential direction. In this embodiment, the entire second surface 335 is the second surface side inclined portion 336. The second surface 335 may be configured to partially include the second surface side inclined portion 336. For example, the second surface 335 may include a second surface side inclined portion 336 and a flat surface portion orthogonal to the axial direction on the radial inner side or the radial outer side of the second surface side inclined portion 336.

The second surface 335 is provided with a groove 334 including a first accommodating groove 337 accommodating the first portion 323, and the groove 334 includes a second accommodating groove 338 accommodating the second portion 322. The first accommodating groove 337 and the second accommodating groove 338 are grooves recessed in L1 on one side. In the present embodiment, the first accommodating groove 337 is provided on the radial outer side of the second accommodating groove 338, and the first accommodating groove 337 extends to the outer peripheral edge of the second plate 33. The first accommodating groove 337 overlaps with the first portion 323 when viewed from the axial direction. The bottom surface of the first accommodating groove 337 is a surface orthogonal to the axial direction, and is a contacted portion 337a to which the first portion 323 of the tip portion 321 abuts. The bottom surface 338a of the second accommodating groove 338 is continuous with the contacted portion 337a of the first accommodating groove 337.

As shown in FIGS. 3 and 4, the impeller 3 has a radial inner first opening 34 sandwiched between two blades 32 adjacent to each other in the circumferential direction between the first plate 31 and the second plate 33. And a second opening 35 on the outer side in the radial direction sandwiched between the first plate 31 and the second plate 33 by two blade portions 32 adjacent to each other in the circumferential direction. In this embodiment, seven first openings 34 and seven second openings 35 are formed. The opening area of the second opening 35 is larger than the opening area of the first opening 34. In the present embodiment, since the second surface 335 includes the second surface side inclined portion 336, the opening area of the second opening 35 is configured so as not to be extremely larger than the opening area of the first opening 34. More specifically, assuming that the opening area of the first opening 34 is A and the opening area of the second opening 35 is B, the opening areas A and B are configured to satisfy the following conditional expressions.
1.2A ≤ B ≤ 1.5A

Next, welding of the impeller will be described. As shown in FIG. 7, the second surface 335 and the tip portion 321 are welded at a position overlapping the flat surface portion 332 in the axial direction by the welding head 100 of the welding device. As a result, the second plate 33 is fixed to the tip portion 321 of the one side L1 of the blade portion 32. In this embodiment, the contacted portion 337a, which is the bottom surface of the first accommodating groove 337, and the first portion 323 of the tip portion 321 are welded. In this embodiment, since the flat surface portion 332 is a plane orthogonal to the axial direction, the second plate 33 is pressed against the flat surface portion 332 by pressing the welding head 100 of the welding device against the blade portion 32 at the time of welding. It can be pressed in the axial direction.

Here, burrs are generated during welding. Since the generated burr is accommodated in the first accommodating groove 337, the burr is not exposed to the outside from the first accommodating groove 337. Further, since the burr generated at the end of the first portion 323 connected to the second portion 322 is also accommodated in the second accommodating groove 338, the burr is not exposed to the outside from the second accommodating groove 338.

(Case)
As shown in FIGS. 1 and 2, the case 4 includes an inner wall 43 constituting the pump chamber 20, a facing wall 45 facing the impeller 3 on one side L1 and a side wall 44 extending in the circumferential direction. The case 4 includes a suction pipe 41 extending along the axial direction and a discharge pipe 42 extending in a direction orthogonal to the axial direction. The suction pipe 41 and the discharge pipe 42 are provided with a suction port 41a and a discharge port 42a at their ends, respectively. The suction pipe 41 and the suction port 41a are provided concentrically with respect to the rotation center axis L. The discharge pipe 42 is located on the outer side in the radial direction of the impeller 3.

As shown in FIG. 2, the facing wall 45 has a shape along the first surface 331 of the second plate 33 when viewed from a direction orthogonal to the axial direction. More specifically, the facing wall 45 includes an inclined surface 451 inclined along the first surface side inclined portion 333 and a flat surface portion 452 along the flat surface portion 332, and the flat surface portion 452 is the rotation center axis. It is a plane orthogonal to L.

(Action effect)
In the pump device 1 of the present embodiment, the second surface 335 and the tip portion 321 are welded at a position where they overlap with the flat surface portion 332 in the direction of the center axis of rotation. Therefore, even when the second surface 335 of the second plate 33 includes the second surface side inclined portion 336 which is an inclined surface approaching the first plate 31 from the radial inner side to the radial outer side, the welding device is provided. By pressing the welding head 100 of the above against the flat surface portion 332, the second plate 33 can be pressed against the blade portion 32 in the axial direction, so that the second surface 335 and the tip portion 321 can be easily welded. Can be done.

In the pump device 1 of the present embodiment, on the surface 312 of the first plate 31 opposite to the second plate 33, a plane orthogonal to the rotation center axis is provided in a region overlapping the plane portion 332 when viewed from the axial direction. There is. With this configuration, when the second plate 33 and the tip end portion 321 of the blade portion 32 are welded, the surface 312 of the first plate 31 opposite to the second plate 33 can be easily supported.

In the pump device 1 of the present embodiment, the plurality of blade portions 32 are integrally formed with the first plate 31. With this configuration, even when a fluid pressure is applied to the blade portion 32, the fluid pressure is applied to the side of the first plate 31. Therefore, the second plate 33 is unlikely to fall off from the blade portion.

In the pump device 1 of the present embodiment, the rotor 5 includes a holder 51 for holding the magnet 10, and the first plate 31 is integrally provided at the end of the holder 51 on the L1 side. With this configuration, the rotor 5 and the impeller 3 can be integrated, so that the coupling strength is improved as compared with the configuration in which the rotor 5 and the impeller 3 are separated. In addition, the number of parts can be reduced.

In the pump device 1 of the present embodiment, the tip portion 321 has a second portion 322 which is an inclined surface approaching the first plate 31 from the radial inner side to the radial outer side, and the second portion 322 toward the radial outer side. A first portion 323, which is a plane orthogonal to the axial direction, is provided. The second surface 335 includes a contacted portion 337a that abuts on the first portion 323. The contacted portion 337a is a plane orthogonal to the axial direction, and the first portion 323 and the contacted portion 337a are welded. With this configuration, the first portion 323 and the contacted portion 337a are planes that are orthogonal to each other in the axial direction. Therefore, when the second plate 33 is pressed against the blade portion 32 in the axial direction, the first portion 323 and the contacted portion 337a are mutually orthogonal to each other. Makes sure to contact. Therefore, it becomes easy to weld the first portion 323 and the contacted portion 337a.

In the pump device 1 of the present embodiment, the second surface 335 is provided with a groove 334 including a first accommodating groove 337 into which the first portion 323 is fitted inside, and the contacted portion 337a is provided by the bottom surface of the first accommodating groove 337. It is configured. With this configuration, the burrs generated when the first portion 323 and the contacted portion 337a are welded are accommodated in the first accommodating groove 337, so that the burrs are exposed to the outside from the first accommodating groove 337. do not. Therefore, it is possible to prevent the burr from peeling off from the impeller 3 when the pump device 1 is operated.

In the pump device 1 of the present embodiment, the groove 334 includes a second accommodating groove in which the second portion 322 fits inward, and the bottom surface 338a of the second accommodating groove 338 has the radial inner side on one side L1 from the radial outer side. It is a surface that is tilted diagonally so that it is located. With this configuration, when the first portion 323 and the contacted portion 337a are welded, the burrs generated at the end of the first portion 323 connected to the second portion 322 are accommodated in the second accommodating groove 338. Therefore, the burr is not exposed to the outside from the second accommodating groove 338. Therefore, it is possible to prevent the burr from peeling off from the impeller 3 when the pump device 1 is operated.

In the pump device 1 of the present embodiment, in the first surface 331, the first surface side inclined portion 333 inclined so that the radially inner side of the flat surface portion 332 is located on one side L1 from the radial outer side is the center of rotation. It extends in the circumferential direction around the axis L. Of the inner wall 43 that partitions the pump chamber 20 of the case 4, the facing wall 45 facing the impeller 3 on one side L1 includes an inclined surface 451 inclined along the first surface side inclined portion 333. With this configuration, it is possible to suppress the loss when the fluid in the pump chamber is moved by the impeller.

In the pump device 1 of the present embodiment, the opening area of the radial inner first opening 34 sandwiched between the first plate 31 and the second plate 33 by two blades 32 adjacent to each other in the circumferential direction is defined as A. When the opening area of the second opening 35 on the outer side in the radial direction sandwiched between the first plate 31 and the second plate 33 by two adjacent blades 32 in the circumferential direction is B, the opening area A, B is the following conditional expression 1.2A ≦ B ≦ 1.5A
Meet. With this configuration, the opening area of the second opening 35 can be configured so as not to be extremely larger than the opening area of the first opening 34. As a result, it is possible to suppress a decrease in the efficiency of the pump device.

(Modification 1)
FIG. 8 is an exploded perspective view of the impeller 3 of the modified example 1. FIG. 9 is a diagram schematically explaining the relationship between the blade portion 32 and the second plate 33 in the first modification. The impeller 3 of the modified example 1 is different in the configuration of the first accommodating groove 337 and the side surface portion 325 of the above-mentioned impeller 3, but the other configurations are the same. Therefore, in the description of the impeller 3 of the modification 1, the same reference numerals are given to the configurations corresponding to the above-mentioned impeller 3, and the description thereof will be omitted.

As shown in FIGS. 8 and 9, in the second plate 33, the radial outer end of the groove 334 does not reach the outer peripheral edge of the second plate 33. Therefore, the side surface portion 325 of the blade portion 32 includes a notch portion 326 notched at the end portion of one side L1. The first accommodating groove 337 comprises a facing wall portion 339 at the radial outer end. The facing wall portion 339 closes the radial outside of the first accommodating groove 337. As shown in FIG. 9, the facing wall portion 339 covers the notch portion 326 from the radial outside. In this embodiment, since the radial outer side of the first accommodating groove 337 is blocked by the facing wall portion 339, the burr generated at the radial outer end of the first portion 323 during welding is described above. Compared with the form, it is surely accommodated in the first accommodating groove 337. Therefore, the burr is not exposed to the outside from the first accommodating groove 337. Therefore, as compared with the above embodiment, it is possible to further suppress the burr from peeling off from the impeller 3 when the pump device 1 is operated.

(Other variants)
In the above embodiment, the second plate 33 is provided with the second accommodating groove 338, but may be configured not to include the second accommodating groove 338.

In the above embodiment, the first plate 31 and the large diameter portion 54 of the rotor 5 are integrally formed of the resin material, but may be configured to be separate.

1 ... pump device, 2 ... motor, 3 ... impeller, 4 ... case, 5 ... rotor, 6 ... stator, 7 ... partition member, 8 ... support shaft, 10 ... magnet, 15 ... cover, 16 ... board, 20 ... pump Room, 31 ... 1st plate, 32 ... Blade, 33 ... 2nd plate, 34 ... 1st opening, 35 ... 2nd opening, 41 ... Suction pipe, 41a ... Suction port, 42 ... Discharge pipe, 42a ... Discharge port, 43 ... Inner wall, 44 ... Side wall, 45 ... Opposing wall, 51 ... Holder, 52 ... Small diameter part, 53 ... Contact part, 54 ... Large diameter part, 56 ... Bearing, 61 ... Stator core, 62 ... Insulator, 63 ... Coil, 71 ... 1st partition, 72 ... 2nd partition, 73 ... 3rd partition, 74 ... hole, 76 ... connector housing, 81 ... plate member, 100 ... welding head, 310 ... hole, 321 ... Tip part, 322 ... Second part, 323 ... First part, 324 ... Side part, 325 ... Side part, 326 ... Notch part, 330 ... Hole part, 331 ... First surface, 332 ... Flat part, 333 ... 1st surface side inclined portion 334 ... groove 335 ... 2nd surface 336 ... 2nd surface side inclined portion 337 ... 1st accommodating groove 337a ... contacted portion 338 ... 2nd accommodating groove 338a ... bottom surface 339 ... Opposing wall part, 621 ... 1st bearing part, 622 ... 2nd bearing part, L ... Rotation center axis

Claims (11)

With a motor equipped with a rotor,
A resin impeller that is arranged on one side in the axial direction in which the rotation center axis of the rotor extends and rotates integrally with the rotor,
A case for partitioning the pump chamber for accommodating the impeller, and
Have,
The impeller has a circular first plate, a plurality of blades protruding from the first plate toward the one side, and extending radially at a plurality of circumferential directions centered on the rotation center axis. A circular second plate with which the tip of the plurality of blades on one side abuts is provided.
The second plate comprises a first surface facing the one side and a second surface facing the opposite side of the first surface.
On the second surface, a second surface-side inclined portion inclined so that the inner side in the radial direction is located on one side of the outer side in the radial direction extends in the circumferential direction around the rotation center axis.
On the first surface, a plane portion orthogonal to the rotation center axis extends in the circumferential direction around the rotation center axis.
The second plate is a pump device characterized in that the second plate is welded to the tip portion at a position where the plurality of blade portions and the flat surface portion overlap when viewed from the axial direction. In the pump device according to claim 1,
A pump characterized in that a plane orthogonal to the rotation center axis is provided in a region of the first plate opposite to the second plate in a region overlapping the plane portion when viewed from the axis direction. Device. In the pump device according to claim 1 or 2.
A pump device characterized in that the plurality of blades are integrally formed with the first plate. In the pump device according to any one of claims 1 to 3,
The rotor comprises a magnet and a resin holder that holds the magnet.
The first plate is a pump device provided at one end of the holder integrally with the holder. In the pump device according to any one of claims 1 to 4.
The tip portion is tilted diagonally so that the first portion orthogonal to the axial direction and the radial inner side of the first portion are located on one side of the radial outer side on the radial inner side or the radial outer side. With two parts,
In the second plate, the contacted portion with which the first portion abuts is a surface orthogonal to the rotation center axis.
A pump device characterized in that the first portion and the contacted portion are welded together. In the pump device according to claim 5,
The second surface is provided with a groove including a first accommodating groove into which the first portion is fitted.
A pump device characterized in that the contacted portion is formed by the bottom surface of the first accommodating groove. In the pump device according to claim 6,
The groove includes a second accommodating groove into which the second portion fits inward.
A pump device characterized in that the bottom surface of the second accommodating groove is a surface inclined obliquely so that the inner side in the radial direction is located on one side of the outer side in the radial direction. In the pump device according to claim 6 or 7.
The pump device is characterized in that the first portion is provided on the radial outer side of the second portion. In the pump device according to claim 7 or 8.
A pump device characterized in that the radially outer end of the groove does not reach the outer peripheral edge of the second plate. In the pump device according to any one of claims 1 to 9.
On the first surface, the first surface-side inclined portion inclined so that the radial inner side is located on one side of the radial outer side on the radial inner side or the radial outer side of the plane portion is centered on the rotation center axis. Extends in the circumferential direction,
A pump device comprising an inclined surface inclined along the first surface side inclined portion in a portion of the inner wall for partitioning the pump chamber of the case, which faces the impeller on one side. In the pump device according to any one of claims 1 to 10.
Let A be the opening area of the radial inner first opening sandwiched between the first plate and the second plate by the two blades adjacent to each other in the circumferential direction, and the first plate and the second plate. When the opening area of the second opening on the outer side in the radial direction sandwiched between the two blades adjacent to each other in the circumferential direction is B, the opening areas A and B are the following conditional expressions 1.2A. ≦ B ≦ 1.5A
A pumping device characterized by satisfying.

Images