JP2018119515A - Fluid pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel electric fluid pump which can stably obtain desired welding rigidity while a welded cross section area becomes uniform even if a height of a welded part is varied, and does not make foreign matters generated by welding flow out to the outside from a welded face.SOLUTION: A cross section shape in a short-side direction of a welded part 42 which is formed at a welded surface 17A side of a vane 17 is formed into a shape which becomes constant in a cross section area toward a direction separating from the welded surface of the vane 17, and a storage part 44 for storing foreign matters which are generated by welding around the welded part is formed. By this constitution, even if a height of the welded part 42 is varied, since the cross section area of the welded part 42 is constant, desired welding rigidity can be stably obtained. Furthermore, since the foreign matters which are generated by welding are stored in the storage part which is formed around the welded part, the foreign matters are prevented from flowing out of a welded face.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a fluid pump used for a cooling system of an automobile, and more particularly to a fluid pump in which an impeller portion constituting the fluid pump is formed of a synthetic resin.

  In recent years, as the demand for reducing fuel consumption of automobiles has increased, commercialization of automobiles with an idling stop function and hybrid cars has progressed. Since these vehicles also stop the fluid pump driven by the internal combustion engine when the internal combustion engine stops, a drive source for a fluid pump other than the internal combustion engine is required. Moreover, in a hybrid vehicle or an electric vehicle, a travel motor, its control device, or a fluid pump for cooling the battery is required. From these backgrounds, there is a tendency to increase the use of electric fluid pumps that perform a pump action by applying a rotational force to a rotor having an impeller portion fixed using an electric motor.

  In the electric fluid pump, the rotor is accommodated in a space communicating with the pump chamber in which the impeller portion is accommodated, and the stator including the winding is accommodated in a space that is liquid-tightly separated from the rotor accommodating space by the partition member. A canned electric fluid pump is in use. And the impeller part is comprised from the shroud main body and the shroud which covers this blade | wing part main body, and these are made from the synthetic tree resin.

  An electric fluid pump having such an impeller portion made of a synthetic resin is described in Japanese Patent Application Laid-Open No. 2015-29480 (Patent Document 1). Here, since the blade body and the shroud cannot generally be integrally molded, they are fixed and integrated by ultrasonic welding.

JP 2015-29480 A

  By the way, in the electric fluid pump provided with the impeller part which consists of such a synthetic resin, the welding part part of a blade | wing part main body and a shroud has a shape as shown in FIG.

  In FIG. 16, reference numeral 50 indicates one blade of the blade body, and a welding portion 51 is formed on the welding surface 50 </ b> S of the blade 50. The entire cross-section of the welded portion 51 is formed in a triangular shape from the welding surface 50S toward the tip side in consideration of the meltability at the start of welding. On the other hand, in the shroud 52 to be welded to the blade body, a welding recess 53, which is a welded portion in which the welded portion 51 is accommodated, is formed, and when the blade body and the shroud are positioned at regular positions, The welding portion 51 and the welding recess 53 are arranged to face each other.

  In this state, the ultrasonic welding apparatus pressurizes between the blade 50 and the shroud 52 of the blade main body to apply ultrasonic vibration, so that the weld 51 and the weld recess 53 are melted and integrated with each other. is there. By the way, in the welding process by the ultrasonic welding apparatus, the welding height of the welding part 51 may vary due to variations in pressure management (stroke management).

  And since the whole cross-sectional shape of the welding part 51 considers the penetration property at the time of a welding start and is formed in the continuous triangle shape, if the height of the welding part 51 varies, the P-line position shown in FIG. There is a possibility that the weld cross-sectional area at the cross section and the cross section at the Q-line position become non-uniform, and the weld strength becomes unstable. Note that the variation in the height of the welded portion 51 occurs not only due to variations in pressure management (stroke management) by the ultrasonic welding apparatus but also due to variations in the dimensions of the blade body and the shroud.

  Further, a foreign matter D such as a melted piece of synthetic resin or “burr” generated at the time of welding may flow out from the welding surface 50S of the blade 50 and the shroud 52 to the outside. If foreign matter D such as molten debris or “burrs” flows out in this way, a phenomenon occurs in which the impeller rotation is locked by entering the impeller portion rotation, which adversely affects pump performance.

  A first object of the present invention is to provide a novel fluid pump that suppresses foreign matter generated by welding from flowing out from a welding surface.

  The second object of the present invention is to provide a uniform welding cross-sectional area and to obtain a predetermined welding strength stably even if the height of the welded portion varies, and foreign matters generated by the welding from the welding surface to the outside. It is an object of the present invention to provide a novel fluid pump that suppresses outflow.

  The first feature of the present invention resides in that a storage portion for storing foreign matter generated by welding is formed around the welding portion formed on the welding surface side of the blade.

  The second feature of the present invention is that the cross-sectional shape in the short direction of the welded portion formed on the welding surface side of the blade in the state before welding is a constant cross-sectional area from the welding surface of the blade toward the tip direction. Further, a storage part for storing foreign matter generated by welding is formed around the welded part.

  According to the first feature of the present invention, the foreign matter generated by the welding is stored in the storage portion formed around the welding portion, so that the foreign matter can be prevented from flowing out from the welding surface.

  According to the second feature of the present invention, even if the height of the welded portion varies, the cross-sectional area of the welded portion is constant, so that a predetermined weld strength can be obtained stably. Moreover, since the foreign material produced by welding is stored in the storage part formed around the welding part, it can suppress that a foreign material flows out from a welding surface.

It is an axial sectional view of the electric fluid pump which becomes an embodiment of the present invention. It is the top view which looked at the electric fluid pump shown in FIG. 1 from the inlet side. It is a figure which shows the front part and side surface of the pump part and rotor part of an electric fluid pump which are shown in FIG. It is sectional drawing which shows the AA cross section shown in FIG. It is the front view of the blade | wing part main body which looked at the blade | wing part main body provided with the blade | wing from the front. It is an expansion perspective view of the welding part vicinity of the R part shown in FIG. It is the back view of the shroud seen from the welding surface side of the shroud welded to a blade | wing part main body. It is sectional drawing which shows the BB cross section shown in FIG. It is sectional drawing before the welding of the welding recessed part of shroud and the welding part formed in the blade | wing which becomes embodiment of this invention. FIG. 10 is a cross-sectional view of the embodiment shown in FIG. 9 after welding in the vicinity of the weld recess formed on the blade and the weld recess of the shroud. It is sectional drawing before welding of the welding part formed in the blade | wing and the welding recessed part vicinity of the shroud which is the 1st modification of embodiment shown in FIG. FIG. 10 is a cross-sectional view of the second modified example of the embodiment shown in FIG. 9 before welding in the vicinity of the weld recess formed on the blade and the weld recess of the shroud. It is sectional drawing before welding of the welding recessed part formed in the blade | wing and the welding recessed part vicinity which is the 3rd modification of embodiment shown in FIG. It is sectional drawing after welding of the welding part formed in the blade | wing and the welding recessed part vicinity of a shroud which is the 4th modification of embodiment shown in FIG. FIG. 10 is a fifth modification of the embodiment shown in FIG. 9, and is a cross-sectional view before welding in the vicinity of a weld recess formed on the blade and a weld recess of the shroud. It is a front view before welding of the welding part formed in the conventional blade | wing and the welding recessed part vicinity of a shroud.

  Embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and application examples are included in the technical concept of the present invention. It is included in the range. Any fluid pump having a drive unit regardless of electric drive or mechanical drive is included in the scope of the present invention. Embodiments of an electric fluid pump according to the present invention will be described below with reference to the drawings.

  First, the configuration of the electric fluid pump according to the present embodiment will be described. FIG. 1 shows a cross section of the electric fluid pump. The electric fluid pump shown in FIG. 1 is a fluid pump that uses cooling water of a cooling system of an automobile as a working fluid and is incorporated in a circulation circuit connected to a radiator or a thermo core as a heat exchanger. Cooling water is supplied to an engine, a drive motor, an inverter, and the like.

  The electric fluid pump 10 according to the present embodiment includes a pump unit 11, a motor unit 12 as a driving unit that drives the pump unit 11, and a control unit 13 that controls the operation of the motor unit 12. It is configured as a solid.

  The pump unit 11 includes a pump housing 15 that forms a pump chamber 14, and an impeller unit 16 that is rotatably accommodated in the pump chamber 14.

  The pump housing 15 has a suction port (not shown) that opens into the pump chamber 14 and a discharge port (not shown) that opens from the outer periphery of the pump chamber 14 to the outside of the pump chamber 14. The pump unit 11 is a centrifugal pump that applies pressure to the cooling water in the radial direction as the impeller unit 16 rotates. As the impeller unit 16 rotates, the cooling water is sucked into the pump chamber 14 from the suction port, and discharged (pressure-fed) from the discharge port through the discharge channel on the outer peripheral side of the impeller unit 16.

  The impeller portion 16 is an impeller having a plurality of blades 17. The impeller portion 16 is formed integrally with the rotor portion 18 at one end of the rotor portion 18 of the motor portion 12 and is installed in the pump chamber 14. Each blade 17 is arranged radially about the central axis of the rotor portion 18. Each blade 17 is disposed, for example, so as to incline to the opposite side to the rotation direction of the impeller portion 16 toward the outer diameter side, and is installed in a spiral shape as a whole.

  In the pump housing 15, a movement restricting member 19 that restricts movement of the rotor portion 18 and the impeller portion 16 in the axial direction is formed integrally with the pump housing 15. One end of the support shaft 20 of the rotor 18 is inserted in the center of the movement restricting member 19, thereby supporting one end of the support shaft 20.

  The motor unit 12 is a so-called inner rotor type DC brushless motor, and forms a cylindrical stator unit 21, a rotor unit 18 provided on the inner peripheral side of the stator unit 21, and a motor chamber 22 that houses these. The housing 23 has a support shaft 20 that is provided in the motor housing 23 and rotatably supports the rotor portion 18.

  The motor housing 23 is made of synthetic resin, and the stator 21 is integrated with the motor housing 23 by insert molding. Similarly, the support shaft 20 is also integrated by insert molding. The motor housing 23 is made of synthetic resin as described above, and has a bottomed cylindrical shape. And it is embed | buried in the synthetic resin so that the support shaft 20 may be planted in center vicinity of the circular bottom face part 23A.

The stator 21 has a plurality of windings 24, and a magnetic flux is generated on the inner peripheral side by energizing the windings 24. The rotor part 18 has a magnetic pole holding part 25 and a shaft part 26 integrally. For example, the rotor part 18 is formed integrally with the impeller part 16 by injection molding a synthetic resin material. The magnetic pole holding part 25 is composed of a permanent magnet and is firmly attached in the rotor part 18 by a synthetic resin. Since the rotor portion 18 comes into contact with the cooling water, it is important that the magnetic pole holding portion 25 is covered with synthetic resin. The magnetic pole holding portion 25 is connected to the inner peripheral surface of the stator 21 through a slight gap (air gap). It is a columnar member installed so as to be opposed to each other, and a plurality of magnetic poles (permanent magnets in which N poles and S poles are alternately arranged in the circumferential direction) corresponding to the plurality of windings 24 of the stator portion 21 are disposed therein. Is held.

  The shaft portion 26 is a shaft member that transmits power for rotating the impeller portion 16, and is provided coaxially with the magnetic pole holding portion 25 so as to be hollow. A first bearing holding portion and a second bearing holding portion are formed near the magnetic pole holding portion 25 and the impeller portion 16 of the rotor portion 18, and a first bearing 27 and a second bearing 28 are installed in these bearing holding portions, respectively. The bearings 27 and 28 are fixed to the rotor 18. The bearings 27 and 28 are both sliding bearings, and the diameters of the inner peripheral surfaces of the bearings 28 and 28 are slightly larger than the diameter of the support shaft 20.

  The support shaft 20 passes through a support hole formed at the center of the rotor 28, and the inner peripheral surface of the bearings 28, 28 fixed to the rotor 18 and the support shaft 20 with the rotor 18 installed on the support shaft 20. There is a slight gap between the outer peripheral surfaces of the two. That is, the bearings 27 and 28 are slidably provided with respect to the support shaft 20, and the rotor 18 is rotatably supported by the support shaft 20 via the bearings 27 and 28.

  The stator portion 21 has a plurality of salient pole portions 29A formed integrally with an iron core 29 and wound with a winding 24 via a synthetic resin bobbin. The stator portion 21 includes an arc-shaped tooth formed on the salient pole portion 29A. The rotor portion 18 is located around the circumference. Therefore, the rotor portion 18 is rotated by sequentially applying electric power to the winding 24.

  A controller 13 is attached to the opposite surface of the bottom surface 23A of the motor housing 23 on the side where the rotor 18 is located. The control unit 13 is a driver that supplies a drive current for the motor unit 12, and includes a control housing 31 that forms the substrate housing chamber 30, a substrate 32 on which electronic components that are housed in the substrate housing chamber 30 are mounted, and the like. Yes.

  Electronic circuit elements (CPU, transistor, etc.) are mounted on the substrate 32, and a converter and a control circuit are constituted by these circuit elements and capacitors. The converter receives power supply from a battery which is a DC power supply and supplies AC power to the winding 24 of the motor unit 12. The control circuit controls on / off of the MOSFET constituting the converter, and is composed of a microcomputer or the like.

  A partition wall member 33 is disposed between the stator portion 21 and the rotor 18. The partition member 33 is made of a thin metal plate having a thin cross section. The partition member 33 is formed in a straight cylindrical shape having open ends that are open at both ends, and extends along the axial direction of the rotor portion 18. One opening end of the partition member 33 is joined to the side surface portion 23B of the motor housing 23 on the impeller portion 16 side, and the other opening end of the partition member 33 is embedded so as to be embedded in the bottom surface portion 23A of the motor housing 23. .

  As can be seen from the figure, the rotor portion 18 is housed inside the partition wall member 33, and cooling water is introduced into the partition wall member 33. Further, the inner peripheral surface of the arc-shaped tooth formed on the salient pole portion 29A of the stator portion 21 is formed in an arc shape that coincides with the outer peripheral surface of the partition wall member 33, and is in metal contact with the outer peripheral surface of the partition wall member 33. ing. As a result, heat from the copper loss of the winding 24 and heat of the internal combustion engine that is input from the surrounding environment are transferred to the partition member 33 via the salient pole portion 29A, and further transferred to the cooling water to be dissipated. It has become.

  FIG. 2 shows the pump inlet side with the pump housing 15 removed, and a discharge passage 34 connected to the pump chamber 14 in which the impeller portion 16 is disposed is formed. The discharge passage 34 is a cooling water flow passage existing between the discharge port and the pump chamber 14. The cooling water of the radiator and the heater core is sucked and collected by the electric fluid pump 10 and then discharged again toward the internal combustion engine.

  Next, the present embodiment will be described in detail with reference to FIGS. 3 and 4 show the configuration of the impeller portion and the rotor portion, FIG. 5 shows the shape of the blade when the blade body is viewed from the front, FIG. 6 shows the shape of the welded portion formed on each blade, and FIG. Fig. 8 shows the back surface of the shroud as seen from the welding surface side of the shroud welded to the blade body, Fig. 8 shows a cross section of the shroud, and Fig. 8 shows the welding portion formed on the blade and the welding portion in the vicinity of the welding recess of the shroud. FIG. 10 shows a cross section after the welding.

  3 and 4, the rotor unit 18 constituting the motor unit 12 includes a magnetic pole made of a permanent magnet inside and is covered with a synthetic resin PR. The synthetic resin PR simultaneously forms the shaft portion 26 and the blade body 40 of the impeller portion 16, and is formed by integrally molding a permanent magnet. As the synthetic resin, PPS (polyphenylene sulfide) resin excellent in heat resistance and dimensional stability is used.

  The blade 17 is formed so as to be planted on the side opposite to the rotor portion 18 side of the blade body 40, and an annular shroud 41 is fixed so as to cover the blade 17. The shroud 41 is also made of PPS resin. An opening 41A for sucking cooling water is formed in the central portion of the shroud 41, and the cooling water sucked from the opening 41A is pressurized by the blades 17 and discharged.

  Here, since the shape of the shroud 41 and the blade body 40 is complicated, it cannot be molded integrally. Therefore, the shroud 41 and the blade body 40 are formed separately and integrated by ultrasonic welding. ing. In addition, although the shroud 41 and the blade | wing part main body 40 are integrated by ultrasonic welding, it can also integrate by "vibration welding" instead of ultrasonic welding. Therefore, the shroud 41 and the blade body 40 are integrated by “friction welding using vibration” including ultrasonic welding and vibration welding. And in this embodiment, the ultrasonic vibration of about 15-50 kilohertz is added to the shroud 41 and the blade | wing part main body 40 with a pressure, and the ultrasonic welding which joins is utilized.

  The location where the shroud 41 and the blade body 40 are welded is an area where the annular shroud 41 and the blade 17 overlap, and a welded portion formed on the blade 17, a weld recess formed on the shroud 41 and where the welded portion is disposed, These will be described later.

  As described above, in the conventional shroud 41 and the blade body 40, the welding height of the welded portion may vary due to variations in pressure management (stroke management) in the welding process by the ultrasonic welding device. And since the entire cross-sectional shape of the welded portion is formed in a continuous triangular shape in consideration of the penetration at the start of welding, if the height of the welded portion varies, the welded cross-sectional area becomes uneven. There is a risk that the welding strength may become unstable.

  Further, a foreign matter D such as a melted piece of synthetic resin or “burr” generated when welding may flow out from the welding surface of the blade body 40 and the shroud 41 to the outside. If foreign matter D such as molten debris or “burrs” flows out in this way, a phenomenon occurs in which the impeller rotation is locked by entering the impeller portion rotation, which adversely affects pump performance.

  Therefore, in this embodiment, in order to solve such a problem, the cross-sectional shape of the welded portion formed on the welding surface side of the blade is changed to a shape that has a constant cross-sectional area from the welding surface of the blade toward the tip. In addition, a storage portion for storing foreign matter generated by welding is formed around the welded portion. According to this, even if the height of the welded portion varies, since the cross-sectional area of the welded portion is constant, a predetermined weld strength can be stably obtained. Moreover, since the foreign material which arises by welding is stored by the storage part formed around the welding part, it becomes possible to suppress that a foreign material flows out from a welding surface.

  Next, details of the present embodiment will be described. In the following embodiments and modifications, a second invention using a welded portion having a shape portion having a constant cross-sectional area will be described. However, since it is only necessary to provide a storage portion in order to prevent the foreign matter from flowing out from the welding surface, it is not a welding portion having a shape portion having a constant cross-sectional area as in the first invention. The welded part shown in FIG. 16 may be used.

  FIG. 5 shows the blade side of the blade part main body 40, and a plurality of blades 17 extend radially toward the outer peripheral side, and the height of the blade 17 decreases from the center side toward the outer peripheral side. A weld portion 42 is formed in the middle thereof, and the position where the weld portion 42 is formed is formed on the outer peripheral side from the opening 41 </ b> A (shown by a broken line) of the shroud 41.

  FIG. 6 shows the shape of the welded portion 42 as viewed from obliquely above with the R portion of FIG. 5 enlarged. As shown in FIG. 6, the welding portion 42 is planted from the welding surface 17 </ b> A so as to extend from the welding surface 17 </ b> A of the blade 17 toward the shroud 41, and is integrated with the blade 17 and along the blade 17. A predetermined length is formed in the longitudinal direction. The welding portion 42 is formed from two regions in a direction away from the welding surface 17A (tip end side), and when viewed in the direction in which the blades 17 extend to the outer peripheral side, the rectangular parallelepiped shape portion 42A and the triangular prism shape portion 42B. It is made up of.

  The triangular prism-shaped portion 42B is formed in this way in order to increase the surface pressure with a welding recess described later and to have a function of improving the solubility of the synthetic resin at the start of welding. The rectangular parallelepiped shaped portion 42A is formed in order to make the welding cross-sectional area uniform when the welding height varies. That is, even if the welding height varies in the region of the rectangular parallelepiped portion 42A, the welding cross-sectional area is constant because it is a rectangular parallelepiped, so that the welding strength can be stabilized. In addition, the height to the front-end | tip direction of the rectangular parallelepiped shape part 42A and the triangular prism shape part 42B can be arbitrarily determined according to the dimension with the welding recessed part mentioned later.

  In addition, a storage portion 44 is formed on the intersecting surface of the rectangular parallelepiped portion 42A forming the weld portion 42 and the weld surface 17A. The storage portion 44 is formed in a groove shape dug inward in the axial direction from the welding surface 17A. The storage portion 44 has a function of storing molten debris and “burrs” generated when the welded portion 42 of the blade 17 and the shroud 41 are welded.

  That is, foreign matter such as molten fragments generated when the welded portion 42 and the shroud 41 are welded may flow out of the welding surface 17A and flow out of the welding surface 17A. On the other hand, by forming the storage portion 44, foreign matter D such as molten debris generated when the weld portion 42 and the shroud 41 are welded is stored in the storage portion 44 and does not flow out of the welding surface 17A. Become. In FIG. 6, the storage portion 44 is formed all around the welded portion 42, but foreign matters such as molten fragments generated when the welded portion 42 and the shroud 41 are welded often flow out in the longitudinal direction. The welded portion 44 can be formed only in the longitudinal direction.

  FIG. 7 shows the back surface of the shroud 41 welded to the blade 17 of the blade body 40, and FIG. 8 shows a BB cross section of FIG. A welding recess 43 is formed on the back surface of the shroud 41 along the shape of the blade 17. When the shroud 41 is attached to the blade body 40, the welding portion 42 is fitted into the welding recess 43. Yes.

  The cross-sectional shape of the weld recess 42 in the short direction is a rectangular shape, and the bottom surface is a flat surface, and the ridgeline between the flat surface portion and the triangular prism shaped portion 42B of the weld portion 42 Are in contact with each other, and are pressurized during this time to give ultrasonic vibrations. In this case, the welding part 42 and the welding recessed part 43 have a shape fitted with a gap, and secure a space for the synthetic resin melted in the welding process to escape.

  Next, the welding of the blade 17 of the blade body 40 and the shroud 41 will be described with reference to FIG. FIG. 9 shows a cross section of the welded portion 42 in the short direction, and shows a state before the blades 17 and the shroud 41 are arranged facing each other and welded. That is, the blade 17 and the shroud 41 have an ultrasonic welding region formed by arranging the welding portion 42 formed on the welding surface of the blade 17 in the welding concave portion 43 formed in the shroud 41. In addition, when vibration welding is used, it becomes a “vibration welding region”, but it can be said in other words as “welding region” by “welding using vibration”.

  In this state, when the horn of the ultrasonic welding device is brought into contact with the shroud 41 and ultrasonically vibrated while pressurizing the shroud 41, the bottom of the welding concave portion 43 and the ridge line on the tip side of the triangular prism shaped portion 42B of the welding portion 42 However, welding is started upon contact at a high surface pressure. Thus, since the surface pressure of the ridge line on the front end side of the triangular prism shaped portion 42B is high, the meltability at the start of welding is good.

  In this state, the stroke of the horn of the ultrasonic welding apparatus becomes large, and the welding process proceeds. Then, as the welding process proceeds, the welding portion 42 melts from the tip side, and the shroud 41 also moves to the blade 17 side in accordance with this, and finally the welding process ends at a predetermined position. As shown in the figure, both are firmly bonded.

  Here, the welding height may vary depending on the stroke management of the horn of the ultrasonic welding apparatus. For example, there are a case where the welding process ends at the P line position in FIG. 9 and a case where the welding process ends at the Q line position. As described above, when the welding height varies, there is a problem that the welding strength is not stable because the welding cross-sectional area is different as shown in FIG.

  On the other hand, in this embodiment, since the rectangular parallelepiped shaped portion 42A is formed in the welded portion 42, the welding height varies due to the stroke management of the horn of the ultrasonic welding apparatus, and the welding process is completed at the P-line position. Even when the welding process is completed and when the welding process is completed at the position of the Q line, the welding cross-sectional area is the same, so that the welding strength is stabilized.

  Thus, according to this embodiment, the welding part formed in the welding surface side of a blade | wing is formed with the rectangular parallelepiped shape part and the triangular prism shape part. For this reason, a fixed welding cross-sectional area comes to be obtained by forming a rectangular parallelepiped shape part toward the front-end | tip direction from the welding surface of a blade | wing. As a result, even if the height of the welded portion varies, the cross-sectional area of the welded portion is constant, so that a predetermined weld strength can be stably obtained.

  Further, since the triangular prism-shaped portion is formed on the tip side from the rectangular parallelepiped-shaped portion, the weldability can be improved at the start of welding with the weld recess, so that the welding operation can proceed smoothly.

  Furthermore, as shown in FIG. 10, the synthetic resin molten debris and foreign matter D such as “burrs” generated in the welding process move to the lower side of the drawing by gravity, but are stored by the storage unit 44. Then, the flow out from the welding surface 17A to the outside is suppressed. As a result, it is possible to suppress the phenomenon that the impeller rotation is locked by entering the rotation of the impeller portion due to the outflow of foreign matter D such as molten debris or “burrs”, and the adverse effect on the pump performance is suppressed. become able to.

  Next, some modified examples of this embodiment will be described. The first modified example is an example in which the triangular prism shaped part 42B is reduced, the second modified example is an example in which the triangular prism shaped part 42B is changed to a reduced rectangular parallelepiped shaped part, and the third modified example is a storage part 44. It is an example formed with an annular wall portion planted from the welding surface, and the fourth modified example is an example in which the storage surface is formed by contacting the welding surface 17A and the lower surface of the shroud 41, and the fifth modified example is This is an example in which a storage portion is formed on the side peripheral surface of the welding recess 43 of the shroud 41.

  FIG. 11 showing the first modification shows an example in which the triangular prism shape portion is reduced. FIG. 11 shows a cross section in the short direction of the welded portion 42, and a triangular prism-shaped portion 42C that is slightly smaller than the triangular prism-shaped portion 42B shown in FIG. 9 is formed on the distal end side of the rectangular parallelepiped-shaped portion 42A. Is. Further, as shown in FIG. 9, the storage portion 44 has a groove shape dug in the axial direction from the welding surface 17 </ b> A.

  In this case as well, as in the example shown in FIG. 9, even if the height of the welded portion varies, the cross-sectional area of the welded portion is constant, so that a predetermined weld strength can be obtained stably. Further, since the triangular prism-shaped portion is formed on the tip side from the rectangular parallelepiped-shaped portion, the weldability can be improved at the start of welding with the weld recess, so that the welding operation can proceed smoothly. The tip shape of the welded portion is not limited to a triangular shape, and may be a shape such as an arc.

  Similarly, a foreign matter D such as a melted piece of synthetic resin or “burr” generated in the welding process moves to the lower side of the drawing due to gravity, but is stored by the storage portion 44, and thus is externally transferred from the welding surface 17 </ b> A. It will be suppressed from flowing out.

  FIG. 12 which shows a 2nd modification has shown the example changed into the rectangular parallelepiped shape part which reduced the triangular prism shape part. FIG. 12 shows a cross section in the short direction of the welded portion 42. A rectangular parallelepiped portion 42D that is slightly smaller than the rectangular parallelepiped portion 42A is formed on the distal end side of the rectangular parallelepiped portion 42A. Further, as shown in FIG. 9, the storage portion 44 has a groove shape dug in the axial direction from the welding surface 17 </ b> A.

  In this case as well, as in the example shown in FIG. 9, even if the height of the welded portion varies, the cross-sectional area of the welded portion is constant, so that a predetermined weld strength can be obtained stably. In addition, since the rectangular parallelepiped portion reduced from the rectangular parallelepiped shape portion is formed on the front end side, the weldability can be improved at the start of welding with the welding concave portion, so that the welding operation can proceed smoothly.

  Similarly, a foreign matter D such as a melted piece of synthetic resin or “burr” generated in the welding process moves to the lower side of the drawing due to gravity, but is stored by the storage portion 44, and thus is externally transferred from the welding surface 17 </ b> A. It will be suppressed from flowing out.

  FIG. 13 which shows a 3rd modification has shown the example which formed the storage part 44 by the wall part which protruded from 17 A of welding surfaces. In FIG. 13, an annular wall 45 that forms the reservoir 44 is formed along the axial direction in which the weld 42 extends from the weld surface 17 </ b> A. Even in such a configuration, the molten debris of the synthetic resin and foreign matter D such as “burrs” generated in the welding process move to the lower side of the drawing by gravity, but are stored by the storage unit 44. Outflow from the surface 17A to the outside is suppressed.

  FIG. 14 showing a fourth modification shows an example in which the storage portion 44 is formed by the welding plane 17 </ b> A and the lower surface of the shroud 41. In FIG. 14, the width WS of the weld recess 43 is formed shorter than the width WL of the weld surface 17A. For this reason, when welding is performed such that the welding surface 17A and the lower surface 41B of the shroud 41 forming the welding recess 43 are in contact with each other, the storage portion 44 is formed by the welding surface 17A and the lower surface 41B of the shroud 41. become.

  In such a structure, the synthetic resin molten debris and foreign matter D such as “burrs” generated in the welding process move to the lower side of the drawing by gravity, but the lower surface 41B of the shroud 41 precedes the welded portion. Approaches and comes into contact with the welding surface 17A. For this reason, the foreign matter D is sealed in the storage portion 44 formed by the welding surface 17A and the lower surface 41B of the welding recess 43, and is prevented from flowing out from the welding surface 17A.

  FIG. 15 showing a fifth modification shows an example in which the storage portion 44 is formed on the side peripheral surface where the welding concave portion 43 of the shroud 41 is formed. In FIG. 15, the storage portion 44 is formed by providing an annular groove 46 on the side peripheral surface 43 </ b> A that forms the weld recess 43.

  Even in such a configuration, the melted pieces of synthetic resin and foreign matter D such as “burrs” generated in the welding process move to the lower side of the drawing by gravity, but are taken into the annular groove 46 on the way. become. For this reason, the foreign matter D is stored in the storage portion 44 including the annular groove 46 provided on the side peripheral surface 43A, and is prevented from flowing out from the welding surface 17A.

  As described above, according to the first invention, the storage portion for storing the foreign matter generated by the welding is formed around the welding portion formed on the welding surface side of the blade. According to this, since the foreign material produced by welding is stored in the storage part formed around the welding part, it can suppress that a foreign material flows out from a welding surface.

  According to the second invention, the cross-sectional shape in the short direction of the welded portion formed on the welding surface side of the blade is formed into a shape having a constant cross-sectional area in a direction away from the welding surface of the blade. Further, a storage part for storing foreign matter generated by welding is formed around the welded part. According to this, even if the height of the welded portion varies, since the cross-sectional area of the welded portion is constant, a predetermined weld strength can be stably obtained. Moreover, since the foreign material produced by welding is stored in the storage part formed around the welding part, it can suppress that a foreign material flows out from a welding surface.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Electric fluid pump, 11 ... Pump part, 12 ... Motor part, 13 ... Control part, 14 ... Pump chamber, 15 ... Pump housing, 16 ... Impeller part, 17 ... Blade | wing, 17A ... Welding surface, 18 ... Rotor part, DESCRIPTION OF SYMBOLS 19 ... Movement control member, 20 ... Support shaft, 21 ... Stator part, 22 ... Motor chamber, 23 ... Motor housing, 24 ... Winding, 25 ... Magnetic pole holding part, 26 ... Shaft part, 27, 28 ... Bearing, 29 ... Iron core, 29A ... salient pole part, 34 ... discharge passage, 40 ... blade part body, 41 ... shroud, 42 ... welded part, 42A ... rectangular parallelepiped shaped part, 42B ... triangular prism shaped part, 43 ... welded recessed part, 44 ... storage part, 45 ... annular wall, 46 ... annular groove.

Claims (10)

A pump section;
A drive unit for driving the pump unit;
A wing part body made of synthetic resin, which is rotated by the drive part that constitutes the pump part and conveys the fluid sucked from the suction port to the discharge port, and the wings formed on the wing part body are fixed. It consists of an impeller with a shroud made of synthetic resin,
The blade and the shroud include a welding region formed by arranging a welding portion formed on the welding surface of the blade in a welding recess formed in the shroud, and the welding surface around the welding portion. In addition, a fluid pump is formed in which a reservoir for storing foreign matter generated by welding is formed. The fluid pump of claim 1,
The welded portion is formed in a shape along the blade,
Furthermore, the storage part is formed in the shape surrounding the welding part or on both sides in the longitudinal direction of the welding part. The fluid pump according to claim 2, wherein
The fluid storage pump is characterized in that the storage part is formed from a groove part dug into the welding surface or a wall part extending from the welding surface along the welding part. A pump section;
A drive unit that drives and controls the pump unit;
A wing part body made of synthetic resin, which is rotated by the drive part that constitutes the pump part and conveys the fluid sucked from the suction port to the discharge port, and the wings formed on the wing part body are fixed. It consists of an impeller with a shroud made of synthetic resin,
The blade and the shroud include a welding region formed by arranging a welding portion formed on the welding surface of the blade in a welding recess formed in the shroud, and in a state before welding, the blade The cross-sectional shape of the weld portion formed in the short direction is formed into a shape having a constant cross-sectional area in a direction away from the weld surface of the blade, and further on the weld surface around the weld portion. A fluid pump characterized in that a reservoir for storing foreign matter generated by welding is formed. The fluid pump according to claim 4.
The welded portion is formed in a shape along the blade,
Furthermore, the storage part is formed in the shape surrounding the welding part or on both sides in the longitudinal direction of the welding part. The fluid pump according to claim 5, wherein
2. The fluid pump according to claim 1, wherein the storage portion is a groove portion dug into the welding surface, or extends from the welding surface along the welding portion, or is formed from a wall portion. The fluid pump according to claim 6.
The fluid pump according to claim 1, wherein a surface of the welding concave portion formed on the shroud is opposed to the welding portion. The fluid pump according to claim 6.
The fluid pump, wherein the welded portion formed on the blade includes a rectangular parallelepiped-shaped portion formed along the blade and formed integrally with the blade. The fluid pump according to claim 8.
The fluid pump according to claim 1, wherein the welded portion formed on the blade includes a triangular prism-shaped portion formed on a tip side of the rectangular parallelepiped-shaped portion. The fluid pump according to claim 8.
The fluid pump according to claim 1, wherein the welding portion formed on the blade includes a rectangular parallelepiped portion smaller than the rectangular parallelepiped shape portion formed on a distal end side with respect to the rectangular parallelepiped shape portion.

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