Pump device

Abstract

To provide a pump device capable of preventing damage of a welding part caused by liquid accumulated between the welding part and a wall part.SOLUTION: In the pump device 2, the case body 6 in which the motor 4 and the impeller 3 are housed includes the resin-made first case body 11 and the resin-made second case body 12 in which the suction portion 12b and the discharge portion for the liquid are formed and which is welded and fixed to the first case body 11, and the portion where the second case body 12 is welded and fixed to the first case body 11 is the annular welded portion 33 surrounding the motor 4 in the radial direction of the rotor 7. An annular wall part 11k surrounding the welding part 33 in the radial direction of the rotor 7 is formed in the first case body 11 or the second case body 12, and a liquid discharge structure 34 for discharging liquid accumulated between the welding part 33 and the wall part 11k is formed in at least one of the first case body 11 and the second case body 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pump device. [Background technology]

[0002] Conventionally, there has been known a fluid pressure pump that circulates cooling water between an engine and a radiator in a vehicle such as an automobile (see, for example, Patent Document 1). In the fluid pressure pump described in Patent Document 1, a pump rotor is arranged in a pump chamber formed inside a housing. The housing includes a first housing made of resin and a second housing made of resin. The first housing and the second housing are joined by thermal welding at a welding position. The welding position is formed in an annular shape. The second housing is formed with an annular outer wall portion that is located outer circumferentially of the welding position. The outer wall portion surrounds the welding position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-155154 Summary of the Invention [Problem to be solved by the invention]

[0004] In the fluid pressure pump described in Patent Document 1, for example, condensation may occur, causing water to accumulate between the welding position and the outer wall. If the water accumulated between the welding position and the outer wall freezes, excessive load may be applied to the welding position, causing damage to the welding position. Furthermore, if the welding position is damaged, the fixing strength between the first housing and the second housing may decrease, causing various problems in the fluid pressure pump.

[0005] Therefore, the object of the present invention is to provide a pump device that has a ring-shaped welded portion, where a second resin case body is welded and fixed to a first resin case body, and a ring-shaped wall portion that surrounds the welded portion from the outer periphery, and that can prevent damage to the welded portion due to liquid that accumulates between the welded portion and the wall portion. [Means for solving the problem]

[0006] In order to solve the above problems, one embodiment of the pump device of the present invention comprises a motor having a rotor and a stator, an impeller that rotates together with the rotor, and a case body in which the motor and impeller are housed, the case body comprising a first case body made of resin and a second case body made of resin in which a liquid intake section and a discharge section are formed and which is welded and fixed to the first case body, the portion where the second case body is welded and fixed to the first case body is an annular welded section that surrounds the motor in the radial direction of the rotor, the first case body or the second case body is formed with an annular wall section that surrounds the welded section in the radial direction of the rotor, and at least one of the first case body and the second case body is formed with a liquid discharge structure for discharging liquid that accumulates between the welded section and the wall section.

[0007] In the pump device of this aspect, at least one of the first case body and the second case body is formed with a liquid discharge structure for discharging liquid that accumulates between the welded portion and the wall portion. Therefore, in this aspect, the liquid discharge structure acts to discharge liquid that accumulates between the welded portion and the wall portion. Therefore, in this aspect, it is possible to prevent damage to the welded portion due to liquid that accumulates between the welded portion and the wall portion. [Effects of the Invention]

[0008] As described above, in one aspect of the present invention, in a pump device having an annular welded portion, where a second resin case body is welded and fixed to a first resin case body, and an annular wall portion surrounding the welded portion from the outer periphery, it is possible to prevent damage to the welded portion caused by liquid accumulating between the welded portion and the wall portion. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view of a pump device according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the pump device shown in FIG. [Figure 3] FIG. 3 is a perspective view of the second case body shown in FIG. [Figure 4] FIG. 4 is a plan view of the second case body shown in FIG. [Figure 5] FIG. 5 is an enlarged view of part E in FIG. [Figure 6] FIG. 6 is a cross-sectional view of a pump device according to another embodiment of the present invention. [Figure 7] FIG. 7 is a bottom view of the first case body shown in FIG. [Figure 8] FIG. 8 is an enlarged cross-sectional view for explaining the configuration of a pump device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] (Overall configuration of the pump device) Fig. 1 is a cross-sectional view of a pump device 2 according to an embodiment of the present invention. Fig. 2 is an exploded perspective view of the pump device 2 shown in Fig. 1. In the following description, the Z1 direction side in Fig. 1 etc. is referred to as the "upper" side, and the Z2 direction side in Fig. 1 etc., which is opposite to the upper side, is referred to as the "lower" side. Note that the "up-down direction" in the following description is defined for the sake of convenience, and does not necessarily coincide with the direction of a plumb line (vertical direction).

[0012] The pump device 2 of this embodiment is a type of pump known as a canned pump (canned motor pump), and is used, for example, to circulate a cooling liquid such as cooling water. The pump device 2 includes an impeller 3, a motor 4 that rotates the impeller 3, a circuit board 5 for controlling the motor 4, and a case body 6 that houses the impeller 3, the motor 4, and the circuit board 5. The motor 4 is composed of a rotor 7 and a stator 8. The axial direction of the rotor 7 coincides with the up-down direction. In other words, the up-down direction is the axial direction of the rotor 7. In this embodiment, the lower side (Z2 direction side) is the first direction side, which is one side of the axial direction of the rotor 7, and the upper side (Z1 direction side) is the second direction side, which is the opposite side of the first direction side.

[0013] The case body 6 includes a first case body 11 made of resin, a second case body 12 made of resin arranged below the first case body 11, and a cover member 13 made of resin arranged above the first case body 11. The case body 6 in this embodiment is composed of the first case body 11, the second case body 12, and the cover member 13. The second case body 12 is fixed to the lower end side of the first case body 11 by welding. The cover member 13 is fixed to the upper end side of the first case body 11 by a plurality of screws.

[0014] The second case body 12 is formed with a liquid intake portion 12b and a discharge portion 12c. A pump chamber 14 is formed inside the case body 6, in which the impeller 3 and the rotor 7 are disposed. Liquid sucked in from the intake portion 12b flows into the pump chamber 14. Liquid flowing out from the pump chamber 14 is discharged from the discharge portion 12c. The pump chamber 14 is defined by the first case body 11 and the second case body 12. In the pump device 2, liquid is sucked in from the lower side of the pump device 2 and discharged radially outward from the rotor 7.

[0015] The rotor 7 includes a cylindrical drive magnet 15, a resin magnet holding member 16 that holds the drive magnet 15, and a cylindrical sleeve 17 that is held by the magnet holding member 16. The magnet holding member 16 is formed in a substantially cylindrical shape. The axial directions of the drive magnet 15, the magnet holding member 16, and the sleeve 17 are aligned vertically. A flange-shaped collar portion 16b that extends radially outward from the rotor 7 is formed at the vertical center of the magnet holding member 16. The drive magnet 15 is attached to the outer peripheral surface of the upper portion of the magnet holding member 16. The lower end surface of the drive magnet 15 is in contact with the upper surface of the collar portion 16b. The sleeve 17 is disposed on the inner peripheral side of the upper portion of the magnet holding member 16.

[0016] The rotor 7 is rotatably supported on a fixed shaft 20 and rotates around the fixed shaft 20. The fixed shaft 20 is arranged so that the axial direction of the fixed shaft 20 coincides with the up-down direction. A recess is formed in the second case body 12 in which the lower end of the fixed shaft 20 is arranged. The upper end of the fixed shaft 20 is held by the first case body 11. A portion of the fixed shaft 20 is arranged on the inner circumferential side of the sleeve 17. A thrust bearing member 21 that contacts the lower end surface of the sleeve 17 is attached to the fixed shaft 20. In this embodiment, the sleeve 17 functions as a radial bearing for the rotor 7, and the sleeve 17 and the thrust bearing member 21 function as a thrust bearing for the rotor 7.

[0017] The impeller 3 is installed at the lower end of the rotor 7. The impeller 3 rotates together with the rotor 7. The impeller 3 is composed of a first blade member 22 made of resin having a plurality of blades arranged at a constant pitch around the circumferential direction of the rotor 7, and a second blade member 23 made of resin that is formed separately from the first blade member 22 and to which the first blade member 22 is fixed. The first blade member 22 is fixed to the underside of the second blade member 23. The first blade member 22 is composed of a plurality of blades and a bottom plate portion 22b to which the lower ends of the plurality of blades are connected. The blades protrude upward from the bottom plate portion 22b.

[0018] The second blade member 23 is formed integrally with the magnet holding member 16 by injection molding. The second blade member 23 is formed in a flange shape that widens from the lower end of the magnet holding member 16 toward the outside in the radial direction of the rotor 7. The second blade member 23 is formed in an annular, flat plate shape. The multiple blades are joined and fixed to the lower surface of the second blade member 23 by welding such as ultrasonic welding. The second blade member 23 formed separately from the magnet holding member 16 may also be fixed to the lower end of the magnet holding member 16.

[0019] The stator 8 is formed in a generally cylindrical shape as a whole. The stator 8 is disposed on the outer periphery of the rotor 7. The stator 8 is disposed so that the axial direction of the stator 8 coincides with the up-down direction. The stator 8 includes a drive coil 25, a stator core 26, and an insulator 27. The stator core 26 includes an outer circumferential ring portion formed in an annular shape, and a plurality of salient pole portions that protrude from the outer circumferential ring portion toward the inside in the radial direction of the rotor 7. The tip surfaces of the salient pole portions (inner surfaces in the radial direction of the rotor 7) face the outer circumferential surface of the drive magnet 15 via an inner cylindrical portion 11b (described later) that constitutes a part of the first case body 11.

[0020] The insulator 27 is made of an insulating material such as resin. The drive coil 25 is wound around the salient pole portion of the stator core 26 via the insulator 27. A plurality of terminal pins 28 are attached to the insulator 27. Ends of the drive coil 25 are electrically connected to and fixed to the terminal pins 28. The terminal pins 28 are electrically connected to and fixed to the circuit board 5.

[0021] The first case body 11 includes a cylindrical inner cylindrical portion 11b disposed between the tip end surface of the salient pole portion of the stator core 26 and the outer peripheral surface of the drive magnet 15, an upper surface portion 11c closing the upper end of the inner cylindrical portion 11b, and an outer cylindrical portion 11d disposed on the outer peripheral side of the inner cylindrical portion 11b. The inner cylindrical portion 11b is disposed so that the axial direction of the inner cylindrical portion 11b coincides with the up-down direction, and the outer cylindrical portion 11d is disposed so that the axial direction of the outer cylindrical portion 11d coincides with the up-down direction. The first case body 11 also includes an annular bottom portion 11e connecting the lower end of the inner cylindrical portion 11b to the lower end of the outer cylindrical portion 11d, and a terminal block 11f on which terminal pins 29 for electrically connecting the pump device 2 to an external device are installed. The terminal block 11f protrudes radially outward from the outer peripheral surface of the outer cylindrical portion 11d. A more specific configuration of the first case body 11 will be described later.

[0022] The stator 8 is disposed between the inner cylindrical portion 11b and the outer cylindrical portion 11d. The stator 8 is also disposed above the bottom portion 11e. The circuit board 5 is a rigid board such as a glass epoxy board, and is formed in a flat plate shape. The circuit board 5 is disposed so that the thickness direction of the circuit board 5 coincides with the up-down direction. The circuit board 5 is fixed to the first case body 11. The circuit board 5 is disposed above the top surface portion 11c, and is disposed outside the pump chamber 14. The terminal pins 29 are electrically connected to and fixed to the circuit board 5.

[0023] The first case body 11 functions to prevent the liquid in the pump chamber 14 from flowing into the locations where the stator 8 and the circuit board 5 are disposed. The cover member 13 is fixed to the upper end side of the first case body 11 so as to cover the circuit board 5 from above. A seal member 30 is disposed between the first case body 11 and the cover member 13 to prevent the liquid from entering the locations where the stator 8 and the circuit board 5 are disposed. The seal member 30 is an O-ring.

[0024] (Configuration of the first case body and the second case body) Fig. 3 is a perspective view of second case body 12 shown in Fig. 1. Fig. 4 is a plan view of second case body 12 shown in Fig. 1. Fig. 5 is an enlarged view of part E in Fig. 1. In the following description, the radial direction of rotor 7 is referred to as the "radial direction," and the circumferential direction (circumferential direction) of rotor 7 is referred to as the "circumferential direction."

[0025] As described above, the second case body 12 is fixed to the first case body 11 by welding. For example, the second case body 12 is joined to the first case body 11 by ultrasonic welding or vibration welding. The portion where the second case body 12 is welded to the first case body 11 is the welded portion 33. The welded portion 33 is formed in an annular shape that surrounds the outer peripheral surface of the outer tubular portion 11d of the first case body 11. The welded portion 33 is also formed in an annular shape that surrounds the motor 4 in the radial direction (i.e., surrounds the motor 4 from the outer peripheral side of the motor 4). The welded portion 33 is formed in an annular shape. Specifically, the welded portion 33 is formed in an annular shape that is centered on the axis of the rotor 7.

[0026] The first case body 11 has a fixed portion 11g to which the second case body 12 is welded and fixed. The fixed portion 11g is formed in a flange shape that spreads radially outward from the outer peripheral surface of the outer cylindrical portion 11d. The fixed portion 11g is formed in an annular shape. The fixed portion 11g is disposed below the center of the outer cylindrical portion 11d in the up-down direction. The fixed portion 11g has a recess 11h that recesses upward from the lower surface of the fixed portion 11g. The recess 11h is formed in an annular shape that surrounds the outer peripheral surface of the outer cylindrical portion 11d. The recess 11h is formed in an annular shape that is centered on the axis of the rotor 7.

[0027] The welded portion 33 is formed in the recess 11h. The outer wall of the recess 11h in the radial direction is an annular wall 11k that surrounds the welded portion 33 in the radial direction. That is, the first case body 11 is formed with an annular wall 11k that surrounds the welded portion 33 in the radial direction. The wall 11k is formed in a tubular shape that extends downward. Specifically, the wall 11k is formed in a cylindrical shape that extends downward. The wall 11k constitutes the outer portion of the fixing portion 11g in the radial direction. Burrs that are generated when the second case body 12 is welded to the first case body 11 accumulate in the recess 11h. That is, the recess 11h functions as a burr reservoir, and the wall 11k prevents the burrs from protruding radially outward from the fixing portion 11g.

[0028] As described above, the second case body 12 is disposed below the first case body 11. The second case body 12 includes a lower cylindrical portion 12d formed in a thin-walled cylindrical shape, and an upper cylindrical portion 12e formed in a thick-walled cylindrical shape and disposed above the lower cylindrical portion 12d. The lower cylindrical portion 12d is disposed so that its axial direction coincides with the up-down direction, and the upper cylindrical portion 12e is disposed so that its axial direction coincides with the up-down direction.

[0029] The lower cylindrical portion 12d and the upper cylindrical portion 12e are formed into a cylindrical shape with a short length in the vertical direction. The outer diameter of the upper cylindrical portion 12e is larger than that of the lower cylindrical portion 12d. The inner diameter of the upper cylindrical portion 12e is larger than that of the lower cylindrical portion 12d. The upper cylindrical portion 12e forms the upper end portion of the second case body 12. The impeller 3 is disposed on the inner peripheral side of the lower cylindrical portion 12d. The second case body 12 also has an annular bottom portion 12f that is connected to the lower end of the lower cylindrical portion 12d.

[0030] Intake portion 12b is formed in a cylindrical shape with its axial direction extending in the vertical direction. Intake portion 12b is connected to the center of bottom portion 12f. Intake portion 12b protrudes downward from bottom portion 12f. Discharge portion 12c is formed in a rectangular shape with its axial direction extending perpendicular to the vertical direction. Discharge portion 12c is connected to lower cylindrical portion 12d. Discharge portion 12c protrudes toward the outer periphery from lower cylindrical portion 12d. The inner periphery of intake portion 12b and the inner periphery of discharge portion 12c are connected to the inner periphery of lower cylindrical portion 12d.

[0031] The second case body 12 is formed with a plurality of mounting portions 12g for mounting the pump device 2 to an external structure. In this embodiment, three mounting portions 12g are formed on the second case body 12. The three mounting portions 12g protrude radially outward from the outer circumferential surface of the upper cylindrical portion 12e. The three mounting portions 12g are arranged at equal intervals in the circumferential direction. The mounting portions 12g are formed in a flat plate shape with the thickness direction being the up-down direction. The upper surface of the mounting portion 12g is arranged on the same plane as the upper end surface of the upper cylindrical portion 12e. The thickness (thickness in the up-down direction) of the mounting portion 12g is thinner than the length of the upper cylindrical portion 12e in the up-down direction. The mounting portion 12g is formed with a circular through-hole that penetrates the mounting portion 12g in the up-down direction.

[0032] An annular recess 12h is formed on the upper surface of the upper cylindrical portion 12e, in which the wall portion 11k of the first case body 11 is disposed. The recess 12h is recessed downward from the upper end surface of the upper cylindrical portion 12e. The recess 12h is formed in a circular ring shape that surrounds the outer cylindrical portion 11d in the radial direction. The recess 12h is also formed in a circular ring shape that is centered on the axis of the rotor 7. The inner wall of the recess 12h in the radial direction forms an annular welding protrusion 12j for welding the second case body 12 to the first case body 11. The outer wall of the recess 12h in the radial direction forms an annular second wall portion 12k that surrounds the wall portion 11k in the radial direction. That is, the second case body 12 is formed with the welding protrusion 12j and the second wall portion 12k.

[0033] The fusion bonding projection 12j and the second wall portion 12k are formed in a cylindrical shape extending upward. Specifically, the fusion bonding projection 12j and the second wall portion 12k are formed in a cylindrical shape extending upward. The second wall portion 12k forms the radially outer portion of the upper end portion of the upper cylindrical portion 12e. The three mounting portions 12g protrude radially outward from the second wall portion 12k. The upper end surface of the second wall portion 12k is arranged on the same plane as the upper surface of the mounting portion 12g. The upper end surface of the second wall portion 12k is arranged slightly below the upper surface of the fixing portion 11g.

[0034] The fusion bonding projection 12j is disposed in the recess 11h of the first case body 11. The upper end of the fusion bonding projection 12j is in contact with the bottom surface (upper surface) of the recess 11h. When the second case body 12 is fixed to the first case body 11, the fusion bonding projection 12j melts to form a welded portion 33. The vertical length of the fusion bonding projection 12j before melting is shorter than the vertical length of the second wall portion 12k.

[0035] The bottom surface (lower surface) of the recess 12h forms an annular opposing surface 12n that faces the lower end surface of the wall portion 11k. That is, the second case body 12 is formed with an annular opposing surface 12n. The opposing surface 12n is formed in an annular shape. The inner circumferential surface of the second wall portion 12k is connected to the opposing surface 12n. The lower end surface of the wall portion 11k and the opposing surface 12n face each other in the vertical direction with a small gap between them. In addition, the second case body 12 is formed with a discharge hole 12p that penetrates the second case body 12 in the vertical direction and is connected to the opposing surface 12n.

[0036] The discharge holes 12p are disposed below the opposing surface 12n. The discharge holes 12p are formed in the base portions of the attachment portions 12g in the radial direction, and are formed radially outward from the wall portion 11k. In this embodiment, two discharge holes 12p are formed in the base portions of each of the three attachment portions 12g, and are spaced apart in the circumferential direction. That is, six discharge holes 12p are formed in the second case body 12. The upper ends of the discharge holes 12p are connected to the radially outer end of the opposing surface 12n. When viewed from above and below, the discharge holes 12p have a triangular shape.

[0037] The opposing surface 12n is formed with inclined surfaces 12r and 12s that slope downward as they approach the discharge hole 12p in the circumferential direction. That is, the opposing surface 12n is formed with inclined surfaces 12r and 12s that slope downward as they approach the discharge hole 12p in the circumferential direction. In this embodiment, three inclined surfaces 12r and three inclined surfaces 12s are formed on the opposing surface 12n.

[0038] 4 is defined as the "clockwise direction" and the direction opposite to the clockwise direction is defined as the "counterclockwise direction." Inclined surface 12r is formed clockwise from the center position of two mounting portions 12g in the circumferential direction and is slightly inclined downward as it approaches discharge hole 12p located on the clockwise end of inclined surface 12r. Inclined surface 12s is formed counterclockwise from the center position of two mounting portions 12g in the circumferential direction and is slightly inclined downward as it approaches discharge hole 12p located on the counterclockwise end of inclined surface 12s.

[0039] Between the clockwise end of inclined surface 12r and the counterclockwise end of inclined surface 12s, there is a flat surface 12t that is perpendicular to the up-down direction. Flat surface 12t is formed on the radially inner side of mounting portion 12g. Inclined surface 12r or inclined surface 12s is connected to the flat surface 12t at the upper end of discharge hole 12p. A water repellent agent is applied to inclined surfaces 12r and 12s. In this embodiment, a water repellent agent is applied to the entire opposing surface 12n, and also to flat surface 12t.

[0040] The inner peripheral surface of the second wall portion 12k forms a second inclined surface 12v that slopes radially outward as it extends upward. As shown in Fig. 1, a relatively large space S is formed above the second wall portion 12k. The space S is large enough to allow liquid to pass through the upper side of the second wall portion 12k under atmospheric pressure.

[0041] In this embodiment, opposing surface 12n, drain hole 12p, and second inclined surface 12v form a liquid drainage structure 34 for draining liquid that accumulates between welded portion 33 and wall portion 11k. That is, liquid drainage structure 34 is formed in second case body 12. Liquid drainage structure 34 in this embodiment functions to drain liquid that accumulates between welded portion 33 and second wall portion 12k.

[0042] For example, when the pump device 2 is installed so that the Z2 direction side coincides with the lower side in the vertical direction, the opposing surface 12n and the drain hole 12p function to drain the liquid that accumulates between the welded portion 33 and the wall portion 11k, and the opposing surface 12n and the drain hole 12p constitute a part of the liquid drainage structure 34. More specifically, for example, when the pump device 2 is installed so that the Z2 direction side coincides with the lower side in the vertical direction, the opposing surface 12n and the drain hole 12p function to drain the liquid that accumulates between the welded portion 33 and the second wall portion 12k.

[0043] Second inclined surface 12v functions to drain liquid that accumulates between welded portion 33 and wall portion 11k, for example, when pump device 2 is installed so that the axial direction of rotor 7 coincides with the horizontal direction, and second inclined surface 12v constitutes a part of liquid drainage structure 34. More specifically, second inclined surface 12v functions to drain liquid that accumulates between welded portion 33 and second wall portion 12k, for example, when pump device 2 is installed so that the axial direction of rotor 7 coincides with the horizontal direction.

[0044] (Main effect of this form) As described above, in this embodiment, second case body 12 is formed with liquid discharge structure 34 for discharging liquid that accumulates between welded portion 33 and wall portion 11k. Therefore, in this embodiment, liquid discharge structure 34 functions to discharge liquid that accumulates between welded portion 33 and wall portion 11k. More specifically, in this embodiment, liquid discharge structure 34 functions to discharge liquid that accumulates between welded portion 33 and second wall portion 12k. Therefore, in this embodiment, it is possible to prevent damage to welded portion 33 caused by liquid that accumulates between welded portion 33 and second wall portion 12k.

[0045] In this embodiment, a cylindrical second wall portion 12k is formed on the second case body 12 on which the attachment portion 12g is formed, and the attachment portion 12g protrudes radially outward from the second wall portion 12k. Therefore, in this embodiment, the strength of the second case body 12 on which the attachment portion 12g is formed can be ensured by the second wall portion 12k. Therefore, in this embodiment, it is possible to prevent damage to the second case body 12 when excessive external force is applied to the pump device 2 attached to an external structure. Meanwhile, in this embodiment, the second wall portion 12k is formed on the second case body 12, which is disposed radially outward from the wall portion 11k. Therefore, liquid tends to accumulate between the welded portion 33 and the second wall portion 12k. However, in this embodiment, the liquid discharge structure 34 allows the liquid that accumulates between the welded portion 33 and the second wall portion 12k to be discharged.

[0046] In this embodiment, the opposing surface 12n and the drain hole 12p that constitute part of the liquid drainage structure 34 function to drain the liquid that accumulates between the welded portion 33 and the second wall portion 12k, for example, when the pump device 2 is installed so that the Z2 direction side coincides with the lower side in the vertical direction. Therefore, in this embodiment, when the pump device 2 is installed so that the Z2 direction side coincides with the lower side in the vertical direction, it becomes possible to efficiently drain the liquid that accumulates between the welded portion 33 and the second wall portion 12k.

[0047] In particular, in this embodiment, facing surface 12n is formed with inclined surfaces 12r and 12s that incline toward drain hole 12p in the vertical direction as they approach drain hole 12p in the circumferential direction, so that when pump device 2 is installed so that the Z2 direction side coincides with the lower side in the vertical direction, it is possible to effectively discharge liquid that accumulates between welded portion 33 and second wall portion 12k. Also, in this embodiment, a water repellent is applied to inclined surfaces 12r and 12s, so that when pump device 2 is installed so that the Z2 direction side coincides with the lower side in the vertical direction, it is possible to more effectively discharge liquid that accumulates between welded portion 33 and second wall portion 12k.

[0048] In this embodiment, the drain hole 12p is formed radially outward from the wall portion 11k. Therefore, in this embodiment, it is possible to efficiently drain liquid that accumulates between the wall portion 11k and the second wall portion 12k. Furthermore, in this embodiment, the drain hole 12p is formed in the base portion of the attachment portion 12g that protrudes radially outward from the second wall portion 12k, and the drain hole 12p is formed in the base portion of the attachment portion 12g, where it is easy to ensure a sufficient thickness. Therefore, in this embodiment, even if the drain hole 12p is formed in the second case body 12, it is possible to suppress a decrease in the strength of the second case body 12.

[0049] In this embodiment, the space S formed above the second wall portion 12k is large enough to allow liquid to pass above the second wall portion 12k under atmospheric pressure, and the second inclined surface 12v constituting part of the liquid discharge structure 34 functions to discharge liquid that accumulates between the welded portion 33 and the second wall portion 12k, for example, when the pump device 2 is installed so that the axial direction of the rotor 7 coincides with the horizontal direction. Therefore, in this embodiment, it becomes possible to efficiently discharge liquid that accumulates between the welded portion 33 and the second wall portion 12k, for example, when the pump device 2 is installed so that the axial direction of the rotor 7 coincides with the horizontal direction.

[0050] (Pump device modification example 1) Fig. 6 is a cross-sectional view of a pump device 2 according to another embodiment of the present invention. Fig. 7 is a bottom view of the first case body 11 shown in Fig. 6. In Figs. 6 and 7, the same reference numerals are used to designate the same components as those in the above-described embodiment.

[0051] In the above-described embodiment, as shown in Fig. 6, the second wall portion 12k may not be formed in the second case body 12. In this case, for example, the wall portion 11k has a notch portion 11p cut out from the lower end surface of the wall portion 11k toward the upper side. For example, as shown in Fig. 7, the wall portion 11k has a plurality of notches 11p arranged at equal intervals in the circumferential direction. In this modification, the notches 11p are formed over the entire area of ​​the wall portion 11k in the up-down direction.

[0052] In this modified example, for example, first case body 11 is formed integrally with stator 8 so as to cover drive coil 25 and stator core 26. Specifically, first case body 11 is molded integrally with stator 8 by insert molding. Also, in this modified example, cover member 13 is welded and fixed to the upper end side of first case body 11. Furthermore, in this modified example, for example, first case body 11 is formed with a plurality of mounting portions for mounting pump device 2 to an external structure.

[0053] In this modified example, cutout portion 11p forms liquid drainage structure 34 for draining liquid that accumulates between welded portion 33 and wall portion 11k. That is, in this modified example, liquid drainage structure 34 is formed in first case body 11. In this modified example, as in the above-described embodiment, the action of liquid drainage structure 34 makes it possible to drain liquid that accumulates between welded portion 33 and wall portion 11k.

[0054] In this modified example, instead of the notch portion 11p, a plurality of through holes penetrating the wall portion 11k in the radial direction may be formed in the first case body 11. In this case, the through holes form a liquid discharge structure 34 for discharging liquid that accumulates between the welded portion 33 and the wall portion 11k. In this modified example, instead of or in addition to the notch portion 11p, a through hole that penetrates the upper cylindrical portion 12e in the vertical direction and is disposed between the welded portion 33 and the wall portion 11k in the radial direction may be formed in the second case body 12, or a through hole that penetrates the fixing portion 11g in the vertical direction and is disposed between the welded portion 33 and the wall portion 11k in the radial direction may be formed in the first case body 11. In these cases, the through hole forms a part of the liquid discharge structure 34 for discharging liquid that accumulates between the welded portion 33 and the wall portion 11k.

[0055] (Pump device modification example 2) Fig. 8 is an enlarged cross-sectional view for explaining the configuration of a pump device 2 according to another embodiment of the present invention. Fig. 8 is an enlarged cross-sectional view corresponding to the enlarged view of part E in Fig. 1. In Fig. 8, the same components as those in the above-described embodiment are denoted by the same reference numerals.

[0056] In the above-described embodiment, as shown in FIG. 8, a recess 12x corresponding to the recess 11h of the first case body 11 and a wall portion 12y corresponding to the wall portion 11k may be formed in the upper tubular portion 12e of the second case body 12, and a recess 11s corresponding to the recess 12h of the second case body 12, a fusion welding protrusion 11t corresponding to the fusion welding protrusion 12j, a second wall portion 11u corresponding to the second wall portion 12k, and an opposing surface 11v corresponding to the opposing surface 12n may be formed in the fixing portion 11g of the first case body 11.

[0057] In this modified example, for example, a drain hole 11w is formed in the first case body 11, which penetrates the fixing portion 11g in the vertical direction and is disposed between the welded portion 33 and the second wall portion 11u in the radial direction. A plurality of drain holes 11w are formed in the first case body 11. The drain hole 11w is connected to the opposing surface 11v. In addition, in this modified example, the inner circumferential surface of the second wall portion 11u is a second inclined surface 11x corresponding to the second inclined surface 12v. The second inclined surface 11x is inclined so as to widen radially outward as it extends downward. A space S is formed below the second wall portion 11u, which is large enough to allow liquid to pass under atmospheric pressure.

[0058] In this modified example, for example, first case body 11 is formed with a plurality of mounting portions for mounting pump device 2 to an external structure. Also, in this modified example, facing surface 11v, drain hole 11w, and second inclined surface 11x form a liquid drainage structure 34 for draining liquid that accumulates between welded portion 33 and wall portion 12y. That is, first case body 11 is formed with liquid drainage structure 34. This liquid drainage structure 34 functions to drain liquid that accumulates between welded portion 33 and second wall portion 11u.

[0059] The opposing surface 11v and the drain hole 11w function to drain liquid that accumulates between the welded portion 33 and the wall portion 12y when the pump device 2 is installed so that the Z1 direction side coincides with the lower side in the vertical direction, for example, and the opposing surface 11v and the drain hole 11w form part of the liquid drainage structure 34. More specifically, the opposing surface 11v and the drain hole 11w function to drain liquid that accumulates between the welded portion 33 and the second wall portion 11u when the pump device 2 is installed so that the Z1 direction side coincides with the lower side in the vertical direction, for example.

[0060] For example, when the pump device 2 is installed so that the axial direction of the rotor 7 coincides with the horizontal direction, the second inclined surface 11x functions to discharge liquid that accumulates between the welded portion 33 and the wall portion 12y, and the second inclined surface 11x constitutes a part of the liquid discharge structure 34. More specifically, when the pump device 2 is installed so that the axial direction of the rotor 7 coincides with the horizontal direction, the second inclined surface 11x functions to discharge liquid that accumulates between the welded portion 33 and the second wall portion 11u.

[0061] In this modified example, similarly to the above-described embodiment, it is possible to discharge liquid that accumulates between the welded portion 33 and the second wall portion 11u by the action of the liquid discharge structure 34. In this modified example, the upper side (Z1 direction side) is the first direction side, which is one side in the axial direction of the rotor 7, and the lower side (Z2 direction side) is the second direction side, which is the opposite side to the first direction side.

[0062] (Other embodiments) The above-described embodiment and modified examples are examples of preferred embodiments of the present invention, but the present invention is not limited to these and various modifications can be made within the scope of the present invention.

[0063] In the above-described embodiment, the number of discharge holes 12p formed in the second case body 12 may be five or less, or seven or more. Furthermore, in the above-described embodiment, the discharge holes 12p may be formed in a portion other than the base portion of the mounting portion 12g. Furthermore, in the above-described embodiment, the water repellent agent may be applied only to the inclined surfaces 12r and 12s. Furthermore, the water repellent agent may not be applied to the inclined surfaces 12r and 12s. Furthermore, in the above-described embodiment, the opposing surface 12n may be a flat surface perpendicular to the vertical direction. In other words, the inclined surfaces 12r and 12s may not be formed on the opposing surface 12n.

[0064] In the above-described embodiment, the inner circumferential surface of the second wall portion 12k may not be inclined. That is, the inner circumferential surface of the second wall portion 12k may be parallel to the vertical direction. In this case, the liquid drainage structure 34 is formed by the opposing surface 12n and the drain hole 12p. Similarly, in the above-described second modification, the inner circumferential surface of the second wall portion 11u may not be inclined. In this case, the liquid drainage structure 34 is formed by the opposing surface 11v and the drain hole 11w. Also, in the above-described embodiment, the drain hole 12p may not be formed in the second case body 12. In this case, the liquid drainage structure 34 is formed by the second inclined surface 12v. Similarly, in the above-described second modification, the drain hole 11w may not be formed in the first case body 11. In this case, the liquid drainage structure 34 is formed by the second inclined surface 11x.

[0065] In the above-described embodiment, a notch 11p may be formed in wall portion 11k. In this case, the liquid drainage structure 34 is formed by opposing surface 12n, drain hole 12p, second inclined surface 12v, and notch 11p. That is, the liquid drainage structure 34 is formed in first case body 11 and second case body 12. Similarly, in the above-described second modification, a notch corresponding to notch 11p may be formed in wall portion 12y. In this case, the liquid drainage structure 34 is formed by this notch, opposing surface 11v, drain hole 11w, and second inclined surface 11x, and the liquid drainage structure 34 is formed in first case body 11 and second case body 12.

[0066] (Configuration of this technology) The present technology can be configured as follows: (1) A motor having a rotor and a stator, an impeller that rotates together with the rotor, and a case body that houses the motor and the impeller, the case body includes a first case body made of resin, and a second case body made of resin in which a liquid intake section and a liquid discharge section are formed and which is welded and fixed to the first case body, a portion where the second case body is welded and fixed to the first case body forms an annular welded portion that surrounds the motor in the radial direction of the rotor, the first case body or the second case body has an annular wall portion that surrounds the welded portion in the radial direction of the rotor, A pump device characterized in that at least one of the first case body and the second case body is formed with a liquid discharge structure for discharging liquid that accumulates between the welded portion and the wall portion. (2) When one side of the rotor in the axial direction is defined as a first direction side and the opposite side of the first direction side is defined as a second direction side, the wall portion is formed in one of the first case body and the second case body, and is formed in a cylindrical shape extending toward the first direction side, the other of the first case body and the second case body is formed with an annular opposing surface opposing an end face of the wall portion on the first direction side, and a discharge hole penetrating the other of the first case body and the second case body in the axial direction of the rotor and connected to the opposing surface, The pump device according to (1), wherein the opposing surface and the discharge hole constitute at least a part of the liquid discharge structure. (3) A pump device as described in (2), characterized in that the opposing surface has an inclined surface that slopes toward the discharge hole in the axial direction of the rotor as it approaches the discharge hole in the circumferential direction of the rotor. (4) The pump device according to (3), wherein the inclined surface is coated with a water repellent agent. (5) The other of the first case body and the second case body is formed with an annular second wall portion surrounding the wall portion in the radial direction of the rotor, and a plurality of mounting portions for mounting the pump device to an external structure, The second wall portion is formed in a cylindrical shape extending toward the second direction side, an inner circumferential surface of the second wall portion is connected to the opposing surface, The pump device according to any one of (2) to (4), wherein the attachment portion protrudes from the second wall portion toward the outside in the radial direction of the rotor. (6) The pump device according to (5), wherein the discharge hole is formed radially outward of the rotor than the wall portion. (7) The pump device according to (6), wherein the discharge hole is formed at the base of the mounting portion in the radial direction of the rotor. (8) The wall portion is formed on the first case body, The pump device described in any one of (5) to (7) is characterized in that the opposing surface, the discharge hole, the second wall portion, and the mounting portion are formed in the second case body. (9) The inner circumferential surface of the second wall portion is a second inclined surface that inclines toward the outer side in the radial direction of the rotor as it extends toward the second direction side, a space is formed on the second direction side of the second wall portion, through which liquid can pass under atmospheric pressure on the second direction side of the second wall portion; The pump device according to any one of (5) to (8), wherein the second inclined surface constitutes at least a part of the liquid discharge structure. (10) When one side of the rotor in the axial direction is defined as a first direction side and the opposite side of the first direction side is defined as a second direction side, The wall portion is formed in a cylindrical shape extending toward the first direction side, The wall portion has a notch portion cut out from an end surface of the wall portion on the first direction side toward the second direction side, or a through hole penetrating the wall portion in a radial direction of the rotor, The pump device according to any one of (1) to (9), wherein the notch or the through hole constitutes at least a part of the liquid discharge structure.

[0067] In this aspect, for example, if one side of the rotor in the axial direction is defined as the first direction side and the side opposite the first direction side is defined as the second direction side, the wall portion is formed in either the first case body or the second case body and is formed in a cylindrical shape extending toward the first direction side, and the other of the first case body and the second case body is formed with an annular opposing surface opposing the end face of the wall portion on the first direction side, and a drain hole that penetrates the other of the first case body and the second case body in the axial direction of the rotor and is connected to the opposing surface, the opposing surface and the drain hole constituting at least a part of the liquid drainage structure. In this case, for example, when the pump device is installed so that the first direction side coincides with the vertically lower side, it is possible to efficiently drain liquid that accumulates between the welded portion and the wall portion.

[0068] In this aspect, the opposing surface preferably has an inclined surface that inclines toward the drain hole in the axial direction of the rotor as it approaches the drain hole in the circumferential direction of the rotor. With this configuration, for example, when the pump device is installed so that the first direction side coincides with the lower side in the vertical direction, it is possible to effectively discharge liquid that accumulates between the welded portion and the wall portion.

[0069] In this aspect, it is preferable that the inclined surface be coated with a water repellent agent, which makes it possible to more effectively discharge liquid that accumulates between the welded portion and the wall portion, for example, when the pump device is installed so that the first direction side is aligned with the lower side in the vertical direction.

[0070] In this embodiment, for example, the other of the first case body and the second case body is formed with a ring-shaped second wall portion that surrounds the wall portion in the radial direction of the rotor, and a plurality of mounting portions for mounting the pump device to an external structure, the second wall portion is formed in a cylindrical shape extending toward the second direction, the inner surface of the second wall portion is connected to the opposing surface, and the mounting portions protrude from the second wall portion toward the outside in the radial direction of the rotor.

[0071] In this case, the strength of the other of the first case body and the second case body on which the attachment portion is formed can be ensured by the second wall portion. Therefore, it is possible to prevent damage to the other of the first case body and the second case body when excessive external force is applied to the pump device attached to an external structure. In this case, since the second wall portion is formed on the other of the first case body and the second case body, liquid tends to accumulate between the welded portion and the second wall portion, but the liquid discharge structure makes it possible to discharge the liquid that accumulates between the welded portion and the second wall portion.

[0072] In this aspect, for example, the drain hole is formed radially outward of the wall portion of the rotor, which makes it possible to efficiently drain liquid that accumulates between the wall portion and the second wall portion.

[0073] In this aspect, the drain hole is preferably formed in a root portion of the mounting portion in the radial direction of the rotor. That is, the drain hole is preferably formed in a root portion of the mounting portion that protrudes from the second wall portion toward the outside in the radial direction of the rotor. This configuration makes it possible to form the drain hole in the root portion of the mounting portion, where it is easy to ensure a sufficient thickness. Therefore, even if a drain hole is formed in the other of the first case body and the second case body, it is possible to suppress a decrease in the strength of the other of the first case body and the second case body.

[0074] In this embodiment, for example, the wall portion is formed in the first case body, and the opposing surface, the discharge hole, the second wall portion, and the attachment portion are formed in the second case body.

[0075] In this aspect, for example, the inner circumferential surface of the second wall portion forms a second inclined surface that inclines toward the radially outer side of the rotor as it approaches the second direction side, and a space is formed on the second direction side of the second wall portion through which liquid can pass under atmospheric pressure through the second direction side of the second wall portion, and the second inclined surface constitutes at least a part of the liquid discharge structure. In this case, for example, when the pump device is installed so that the axial direction of the rotor is aligned with the horizontal direction, it is possible to efficiently discharge liquid that accumulates between the welded portion and the second wall portion.

[0076] In this embodiment, if one axial side of the rotor is defined as the first direction side and the opposite side to the first direction side is defined as the second direction side, for example, the wall portion is formed in a cylindrical shape extending toward the first direction side, and the wall portion has a notch portion cut out from the end face of the wall portion on the first direction side toward the second direction side, or a through hole is formed that penetrates the wall portion in the radial direction of the rotor, and the notch portion or through hole forms at least a part of the liquid discharge structure. [Explanation of symbols]

[0077] 2. Pumping equipment 3 impeller 4 motors 6 Case body 7 rotor 8 Stator 11 First case body 11k wall 11p Notch 11u 2nd wall section 11v opposing surface 11w discharge hole 11x 2nd slope 12 Second case body 12b Suction part 12c Discharge part 12g Mounting part 12k 2nd wall 12n Opposite surface 12p discharge hole 12r, 12s slope 12v 2nd slope 12y wall 33 Welded area 34 Liquid discharge structure S Space Z1 Second Direction Side Z2 First Direction Side

Claims

1. The motor includes a rotor and a stator, an impeller that rotates together with the rotor, and a case body that houses the motor and the impeller. the case body includes a first case body made of resin, and a second case body made of resin in which a liquid intake section and a liquid discharge section are formed and which is welded and fixed to the first case body, a portion where the second case body is welded and fixed to the first case body forms an annular welded portion that surrounds the motor in the radial direction of the rotor, an annular wall portion is formed in the first case body or the second case body to surround the welded portion in the radial direction of the rotor; A pump device characterized in that at least one of the first case body and the second case body is formed with a liquid discharge structure for discharging liquid that accumulates between the welded portion and the wall portion.

2. When one side of the rotor in the axial direction is defined as a first direction side and the side opposite to the first direction side is defined as a second direction side, the wall portion is formed in one of the first case body and the second case body, and is formed in a cylindrical shape extending toward the first direction side, the other of the first case body and the second case body is formed with an annular opposing surface opposing an end face of the wall portion on the first direction side, and a discharge hole penetrating the other of the first case body and the second case body in the axial direction of the rotor and connected to the opposing surface, 2. The pump device according to claim 1, wherein the opposing surface and the drain hole form at least a part of the liquid drainage structure.

3. 3. The pump device according to claim 2, wherein the opposing surface is formed with an inclined surface that inclines toward the discharge hole in the axial direction of the rotor as it approaches the discharge hole in the circumferential direction of the rotor.

4. 4. The pump device according to claim 3, wherein the inclined surface is coated with a water repellent agent.

5. the other of the first case body and the second case body is formed with an annular second wall portion that surrounds the wall portion in the radial direction of the rotor, and a plurality of mounting portions for mounting the pump device to an external structure; The second wall portion is formed in a cylindrical shape extending toward the second direction side, an inner circumferential surface of the second wall portion is connected to the opposing surface, 5. The pump device according to claim 2, wherein the attachment portion protrudes from the second wall portion toward an outer side in a radial direction of the rotor.

6. 6. The pump device according to claim 5, wherein the discharge hole is formed radially outward of the rotor relative to the wall portion.

7. 7. The pump device according to claim 6, wherein the discharge hole is formed at a base portion of the mounting portion in a radial direction of the rotor.

8. the wall portion is formed on the first case body, 6. The pump device according to claim 5, wherein the opposing surface, the discharge hole, the second wall portion, and the mounting portion are formed on the second case body.

9. an inner circumferential surface of the second wall portion forms a second inclined surface that inclines toward an outer side in the radial direction of the rotor as it extends toward the second direction; a space through which liquid can pass through the second direction side of the second wall portion under atmospheric pressure is formed on the second direction side of the second wall portion; 6. The pump device according to claim 5, wherein the second inclined surface forms at least a part of the liquid discharge structure.

10. When one side of the rotor in the axial direction is defined as a first direction side and the side opposite to the first direction side is defined as a second direction side, The wall portion is formed in a cylindrical shape extending toward the first direction side, The wall portion has a notch portion cut out from an end surface of the wall portion on the first direction side toward the second direction side, or a through hole penetrating the wall portion in a radial direction of the rotor, 5. The pump device according to claim 1, wherein the notch or the through hole constitutes at least a part of the liquid discharge structure.

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