CN212838591U - Pump device - Google Patents

Abstract

A pump device that helps simplify the structure of a manufacturing mold without significantly affecting performance. The utility model discloses a pump unit includes pump casing and motor housing, including pump casing and motor housing, the pump casing has fluid sunction inlet, fluid discharge port and casing portion, the impeller is accomodate to casing portion, motor housing accomodate right the impeller carries out driven motor, wherein, fluid discharge port for the rotation axis of impeller extends towards radial outside on the inner peripheral surface of casing portion, winding the rotation axis of impeller upwards be close to the position of fluid discharge port is provided with tongue piece portion, winding upwards the rotation axis of impeller upwards the tongue piece portion with be provided with step portion between the fluid discharge port.

Description

Pump device

Technical Field

The utility model relates to a pump device.

Background

Conventionally, there is a pump device including a pump housing having a fluid inlet, a fluid outlet, and a housing portion that houses an impeller, and a motor housing that houses a motor that drives the impeller.

In the pump device, in order to increase the discharge pressure by allowing the fluid sucked into the casing from the fluid inlet and pressurized by the impeller to flow smoothly toward the fluid outlet, as shown in fig. 7, a tongue portion 1311X may be provided on a portion of the inner wall surface of the pump housing 10X located between the casing 13X and the fluid outlet 12X in the circumferential direction around the rotation axis of the impeller.

However, the pump housing of the pump device is generally formed by casting, and specifically, the outer wall surface of the pump housing and the inner wall surface of the housing are generally formed by a fixed mold, and the fluid discharge port is formed by a slide mold that slides in the extending direction of the fluid discharge port with respect to the fixed mold. In this case, the shape of the mold is easily complicated, and the mold portion for forming the tongue piece portion is easily broken.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pump device which facilitates simplification of a structure of a manufacturing mold without significantly affecting performance.

In order to achieve the above object, the present invention provides a pump device, including a pump housing and a motor housing, the pump housing has a fluid suction port, a fluid discharge port and a housing portion, the housing portion accommodates an impeller, the motor housing accommodates a motor that drives the impeller, wherein the fluid discharge port extends toward a radial outer side with respect to a rotation axis of the impeller, a tongue portion is provided on an inner peripheral surface of the housing portion at a position that is close to the fluid discharge port in a circumferential direction around the rotation axis of the impeller, and a step portion is provided between the tongue portion and the fluid discharge port in the circumferential direction around the rotation axis of the impeller.

According to the pump device of the present invention, the tongue piece portion is provided on the inner peripheral surface of the housing portion at a position close to the fluid discharge port in the circumferential direction around the rotation axis of the impeller, and therefore, the sectional area of the flow path at the boundary between the fluid discharge port and the housing portion is temporarily narrowed, which contributes to smooth flow of the fluid sucked into the housing portion from the fluid suction port and pressurized by the impeller toward the fluid discharge port and improvement of the discharge pressure; further, since the stepped portion is provided between the tongue portion and the fluid discharge port in the circumferential direction around the rotation axis of the impeller, when the pump casing is formed by casting, there is no need to form the tongue portion by fitting a mold for forming the inner wall surface of the casing portion and a mold for forming the fluid discharge port, which contributes to simplification of the structure of the manufacturing mold.

In the pump device according to the present invention, it is preferable that the inner peripheral surface of the casing portion has an involute curve shape when viewed along the rotation axis of the impeller, and the fluid discharge port is located between a start point and an end point of the involute curve.

According to the present invention, when the pump device is observed along the rotation axis of the impeller, the inner periphery of the housing portion is in an involute shape, and the fluid discharge port is located between the start point and the end point of the involute shape, and therefore, compared with the case where the inner periphery of the housing portion is in a perfect circle shape when observed along the axis direction of the impeller, the fluid pressurizing section up to the fluid discharge port can be extended, and the fluid can be conveyed toward the fluid discharge port after being sufficiently pressurized.

In the pump device of the present invention, it is preferable that the fluid discharge port extends along a tangent line at an end point of the involute curve, and the tongue piece portion is provided in the vicinity of a start point of the involute curve.

In the pump device of the present invention, it is preferable that the thickness of the tongue portion of the housing portion increases as the fluid discharge port approaches.

According to the pump device of the present invention, since the wall thickness of the tongue portion of the housing portion increases as the fluid discharge port approaches, the mounting strength can be easily ensured when the portion near the fluid discharge port is used for connection with an external device.

In the pump device of the present invention, it is preferable that a flat surface portion is provided on the outer peripheral surface of the housing portion at a position corresponding to the tongue portion.

According to the utility model discloses a pump unit is provided with plane portion in the position that corresponds with tongue portion on the outer peripheral face of casing portion, consequently, simplifies the structure of manufacturing the mould easily.

Further, in the pump device of the present invention, it is preferable that the pump housing is provided on one side in the extending direction of the rotation axis with respect to the motor housing, a vibration welded portion connecting the pump housing to the motor housing and a pump housing side step portion and a motor housing side step portion which are radially inward of the vibration welded portion are formed at a butt portion of the pump housing and the motor housing, and the pump housing side step portion and the motor housing side step portion have axially opposing surfaces which are opposed to each other in a manner close to each other in the extending direction at a position closer to one side in the extending direction of the rotation axis than the vibration welded portion.

According to the pump device of the present invention, the vibration welded portion connecting the pump housing and the motor housing, and the pump housing side step portion and the motor housing side step portion which are radially inward of the vibration welded portion are formed at the abutting portion of the pump housing and the motor housing, and the pump housing side step portion and the motor housing side step portion have the axially opposing faces which are opposed to each other so as to be close to each other in the extending direction at the position on one side in the extending direction of the rotation axis from the vibration welded portion, even if a certain radial gap needs to be provided between the pump housing and the motor housing in order to perform vibration welding of the pump housing and the motor housing (welding one of the pump housing and the motor housing by vibrating the other in the radial direction), the welding slag generated during vibration welding of the pump housing and the motor housing is easily received by the pump housing side stepped portion and the motor housing side stepped portion and is not discharged to the pump side.

In the pump device according to the present invention, it is preferable that the motor housing side stepped portion has a guide portion facing the pump housing side stepped portion on a radially inner side in an extending direction of the fluid discharge port, and the guide portion has an inclined surface on a side closer to a radially outer side in the extending direction of the rotation axis.

According to the present invention, the motor housing side step portion has the guide portion opposed to the pump housing side step portion on the radial inner side at the position opposed to the fluid discharge port, and the guide portion has the inclined surface which is closer to the one side in the extending direction of the rotation axis more than the radial outer side, and therefore, compared with the case where the guide portion having the inclined surface is not provided, the loss of momentum of the fluid pressurized by the impeller can be reduced, the rotation speed of the impeller can be reduced without changing the output characteristic, the power consumption can be reduced, and the obstruction on the flow path can be reduced without greatly reducing the volume of the flow path, and the pump device is less susceptible to the influence of the height of the impeller and the height position of the fluid discharge port in the design, and the degree of freedom in design is high.

In the pump device according to the present invention, it is preferable that a height of a portion of the guide portion which is away from the fluid discharge port and protrudes from the axially facing surface of the motor housing side step portion gradually increases as the guide portion approaches the fluid discharge port.

According to the present invention, the height of the guide portion projecting from the axial opposite surface of the motor housing-side step portion is gradually increased as the guide portion approaches the fluid discharge port, and therefore, the loss of momentum of the fluid pressurized by the impeller can be further reduced.

In the pump device according to the present invention, it is preferable that the leading end of the guide portion protrudes toward one side in the extending direction of the rotation axis from a bottom surface of the fluid discharge port on the other side in the extending direction of the rotation axis.

According to the pump device of the present invention, the front end of the guide portion protrudes toward one side in the extending direction of the rotation axis than the bottom surface of the other side in the extending direction of the rotation axis of the fluid discharge port, and therefore, the height of the guide portion constituting the wall portion for preventing the welding slag from flowing out is easily increased, and even if the flow velocity of the fluid at the fluid discharge port side is high, the welding slag is not easily flowed out.

(effects of utility model)

According to the present invention, in the pump device, the tongue piece portion is provided on the inner peripheral surface of the housing portion at a position close to the fluid discharge port in the circumferential direction around the rotation axis of the impeller, and therefore, the sectional area of the flow path at the boundary between the fluid discharge port and the housing portion is temporarily narrowed, which contributes to smooth flow of the fluid sucked into the housing portion from the fluid suction port and pressurized by the impeller toward the fluid discharge port and improvement of the discharge pressure; further, since the stepped portion is provided between the tongue portion and the fluid discharge port in the circumferential direction around the rotation axis of the impeller, when the pump casing is formed by casting, there is no need to form the tongue portion by fitting a mold for forming the inner wall surface of the casing portion and a mold for forming the fluid discharge port, which contributes to simplification of the structure of the manufacturing mold. Further, according to the present invention, since the motor housing side step portion has the guide portion facing the pump housing side step portion on the radially inner side at the position facing the fluid discharge port and the guide portion has the inclined surface on the side closer to the radially outer side in the extending direction of the rotation axis, the loss of momentum of the fluid pressurized by the impeller can be reduced as compared with the case where the guide portion having the inclined surface is not provided, the rotation speed of the impeller can be reduced and the power consumption can be reduced without changing the output characteristic, the obstruction on the flow path can be reduced without greatly reducing the volume of the flow path, and the influence of the height of the impeller and the height position of the fluid discharge port is not easily received at the time of design, and the degree of freedom of design is high.

Drawings

Fig. 1 is a side sectional view schematically showing a pump device according to an embodiment of the present invention.

Fig. 2 is a partial sectional view schematically showing a pump device according to an embodiment of the present invention, and shows a state viewed from a fluid suction port side of a pump housing.

Fig. 3 is a partial sectional view schematically showing a pump device according to an embodiment of the present invention, and shows a state viewed from a fluid suction port side of a pump housing.

Fig. 4 is a partial sectional view schematically showing a pump device according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view schematically showing a pump device according to an embodiment of the present invention, and shows a state viewed from a fluid discharge port side of a pump housing.

Fig. 6 is a partial sectional view schematically showing a pump device according to an embodiment of the present invention.

Fig. 7 is a cross-sectional view schematically showing an example of a pump housing of the pump device.

(symbol description)

1 Pump device

10 pump casing

11 fluid suction inlet

12 fluid discharge port

13 housing part

131 casing barrel

1311 tongue piece

1312 step part

1313 plane part

132 Top of the housing portion

20 motor shell

211 barrel part of motor shell

212 Top of Motor housing

213 bottom of motor housing

30 impeller

40 Motor

41 rotor

411 cylindrical part

412 magnet

42 stator

43 bearing

44 fixed shaft

50 circuit board

VW vibration welding part

PP pump housing side step part

MP motor shell side step part

GP guide part

Part of the GP1 guide

Axial direction opposite surface of P1 pump casing side step part

Axial opposite surface of P2 motor shell side step part

CP connector section

IP installation part

RP annular wall

Starting point of ST involute

End point of ED involute

L rotation axis of impeller

One side in the extending direction of the rotation axis of the L1 impeller

The other side in the extending direction of the rotation axis of the L2 impeller

Detailed Description

Next, a pump device according to an embodiment of the present invention will be described with reference to fig. 1 to 6, in which fig. 1 is a side sectional view schematically showing the pump device according to the embodiment of the present invention, fig. 2 is a partial sectional view schematically showing the pump device according to the embodiment of the present invention, and shows a state observed from the fluid suction port side of the pump housing, fig. 3 is a partial sectional view schematically showing the pump device according to the embodiment of the present invention, and shows a state observed from the fluid suction port side of the pump housing, fig. 4 is a partial sectional view schematically showing the pump device according to the embodiment of the present invention, fig. 5 is a sectional view schematically showing the pump device according to the embodiment of the present invention, and shows a state observed from the fluid discharge port side of the pump housing, and fig. 6 is a partial sectional view schematically showing the pump device according to the embodiment of the present invention.

(integral construction of Pump device)

As shown in fig. 1, the pump device 1 includes a pump housing 10 and a motor housing 20, wherein the pump housing 10 includes a fluid suction port 11, a fluid discharge port 12, and a housing 13, the housing 13 houses an impeller 30, and the motor housing 20 houses a motor 40 that drives the impeller 30.

Here, when the motor 40 is operated, the impeller 30 is rotated, whereby fluid is sucked into the pump chamber of the pump device 1 from the fluid suction port 11, pressurized, and then discharged to the outside from the fluid discharge port 12.

(Structure of one side of Pump case)

As described above, the pump housing 10 has the fluid suction port 11, the fluid discharge port 12, and the housing portion 13. As shown in fig. 1, the fluid inlet 11 extends in the extending direction (vertical direction in the drawing) of the rotation axis L of the impeller 30. The fluid discharge port 12 extends radially outward with respect to the rotation axis L of the impeller 30 (not limited to extending strictly perpendicular to the rotation axis L). The housing portion 13 forms a pump chamber, and includes a cylindrical portion 131 and a top portion 132, the cylindrical portion 131 rotatably accommodating the impeller 30 and being provided with a discharge pipe constituting the fluid discharge port 12, and the top portion 132 closing one end of the cylindrical portion 131 and being provided with a suction pipe constituting the fluid suction port 11. The impeller 30 has a flat disk shape and includes a plurality of blades that are arranged at intervals around the rotation axis L of the impeller 30 and extend in an arc shape from the rotation axis L side of the impeller 30 toward the radially outer side.

As shown in fig. 2 and 3, a tongue piece portion 1311 is provided on the inner peripheral surface of the housing portion 13 at a position close to the fluid discharge port 12 in the circumferential direction around the rotation axis L of the impeller 30, and a step portion 1312 is provided between the tongue piece portion 1311 and the fluid discharge port 12 in the circumferential direction around the rotation axis L of the impeller 30. The tongue portion 1311 is a triangle having a substantially vertex angle as viewed along the rotation axis L of the impeller 30, and includes a first side wall surface forming a part of an involute curve, a second side wall surface intersecting the first side wall surface and located between the first side wall surface and the step portion 1312, and a chamfered portion connecting the first side wall surface and the second side wall surface.

As shown in fig. 3, the inner peripheral surface of the housing portion 13 has an involute curve shape when viewed along the rotation axis L of the impeller 30, and the fluid discharge port 12 is located between the start point ST and the end point ED of the involute curve. The fluid discharge port 12 extends along a tangent line at the end point ED of the involute curve, and the tongue piece 1311 is provided near the start point ST of the involute curve.

As shown in fig. 3, the wall thickness of the tongue portion 1311 of the housing portion 13 increases as it approaches the fluid discharge port 12. A flat portion 1313 is provided on the outer peripheral surface of the case portion 13 at a position corresponding to the tongue portion 1311.

Further, as shown in fig. 4 to 6, the pump housing 10 is provided on one side L1 (upper side in the drawing) in the extending direction of the rotation axis L of the impeller 30 with respect to the motor housing 20. A vibration welding portion VW (for example, but not limited to, continuously formed in the entire circumferential direction around the rotation axis L of the impeller 30) that connects the pump casing 10 and the motor casing 20, and a pump casing side step PP and a motor casing side step MP that are radially inward of the vibration welding portion VW are formed at the abutting portion between the pump casing 10 and the motor casing 20, and the pump casing side step PP and the motor casing side step MP have axial facing surfaces P1 and P2 that closely face each other in the extending direction at a position on one side L1 in the extending direction of the rotation axis L from the vibration welding portion VW.

(Structure of one side of Motor case)

As described above, the motor housing 20 houses the motor 40 that drives the impeller 30.

As shown in fig. 1, the motor housing 20 includes a cylindrical portion 211 in which the motor 40 is accommodated, a top portion 212 that closes one end (upper end in the drawing) of the cylindrical portion 211, and a bottom portion 213 that closes the other end (lower end in the drawing) of the cylindrical portion 211, wherein the top portion 212 encloses a pump chamber together with the housing portion 13, the top portion 212 is formed integrally with one end of the cylindrical portion 211, and a recessed portion that is recessed from one side L1 to the other side L2 in the extending direction of the rotation axis L of the impeller 30 and is accommodated in a rotor 41, which will be described later, of the motor 40 is formed in the center thereof, and the bottom portion 213 is formed separately from the cylindrical portion 211 and is fixed to the other end of the cylindrical. As shown in fig. 5, a connector portion CP for electrically connecting to the outside and provided with a terminal pin, and an attachment portion IP for connecting the pump device 1 to an external device are provided on a side surface of the motor case 20. Also, the motor 40 has a rotor 41 and a stator 42 surrounding the rotor 41; the rotor 41 has a cylindrical portion 411 provided coaxially with the impeller 30 and having one end connected to the impeller 30, and a magnet 412 provided on the outer peripheral side of the cylindrical portion 411, and is rotatably supported by the fixed shaft 44 via a bearing 43, wherein the bearing 43 has a cylindrical shape extending along the rotation axis L of the impeller 30 and is penetrated by the fixed shaft 44, the fixed shaft 44 extends along the rotation axis L of the impeller 30, the one end (upper end in the figure) is supported by the pump housing 10, and the other end (lower end in the figure) is supported by the motor housing 20; the stator 42 includes a stator core facing the magnet 412 of the rotor 41 at an interval on the outer circumferential side, and a coil wound around the stator core. As shown in fig. 1, the cylindrical portion 211 of the motor housing 20 also houses a circuit board 50, and the circuit board 50 is provided on the other side L2 in the extending direction of the rotation axis L of the impeller 30 with respect to the motor 40, and is electrically connected to the coil of the stator 42 of the motor 40.

As shown in fig. 5 and 6, the motor housing side step portion MP has a guide portion GP facing the pump housing side step portion PP on the radially inner side at a position facing the fluid discharge port 12 (i.e., at a position overlapping the fluid discharge port 12 as viewed in the extending length direction of the fluid discharge port 12), and the guide portion GP has an inclined surface facing the one side L1 in the extending direction of the rotation axis L on the radially outer side. The guide portion GP is located on the outer circumferential side of the impeller 30. Further, the height of the portion GP1 of the guide portion GP remote from the fluid discharge port 12 protruding from the axially facing surface P2 of the motor case side step portion MP gradually increases as it approaches the fluid discharge port 12. As shown in fig. 6, the tip (upper end in the drawing) of the guide portion GP protrudes to one side L1 in the extending direction of the rotation axis L from the bottom surface of the other side L2 in the extending direction of the rotation axis L of the fluid discharge port 12.

As shown in fig. 1 and 6, the motor case 20 has an annular wall RP surrounding the vibration welding portion VW, and the annular wall RP and the motor case-side stepped portion MP are opposed to each other in the radial direction with the vibration welding portion VW interposed therebetween.

(main technical effects of the present embodiment)

According to the pump device 1 of the present embodiment, the tongue portion 1311 is provided on the inner peripheral surface of the housing portion 13 of the pump housing 10 at a position close to the fluid discharge port 12 in the circumferential direction around the rotation axis L of the impeller 30, and therefore, the cross-sectional area of the flow path at the boundary between the fluid discharge port 12 and the housing portion 13 is temporarily narrowed, which contributes to smooth flow of the fluid sucked into the housing portion 13 from the fluid suction port 11 and pressurized by the impeller 30 toward the fluid discharge port 12 and improvement of the discharge pressure; further, since the stepped portion 1312 is provided between the tongue piece portion 1311 and the fluid discharge port 12 in the circumferential direction around the rotation axis L of the impeller 30, when the pump housing 10 is formed by casting, there is no need to form the tongue piece portion by fitting a mold for forming the inner wall surface of the housing portion 10 and a mold for forming the fluid discharge port 12, which contributes to simplification of the structure of the manufacturing mold.

Further, according to the pump device 1 of the present embodiment, the motor housing side step portion MP has the guide portion GP facing the pump housing side step portion PP on the radially inner side at the position facing the fluid discharge port 12, and the guide portion GP has the inclined surface on the one side L1 in the extending direction of the rotation axis L toward the radially outer side, so that the loss of momentum of the fluid pressurized by the impeller 30 can be reduced as compared with the case where the guide portion having the inclined surface is not provided, the rotation speed of the impeller 30 can be reduced and the power consumption can be reduced without changing the output characteristics, the obstruction on the flow path can be reduced without greatly reducing the volume of the flow path, and the design is not easily affected by the height of the impeller and the height position of the fluid discharge port, and the degree of freedom in design is high.

The present invention has been described above by way of example with reference to the accompanying drawings, and it is to be understood that the specific implementations of the present invention are not limited to the above-described embodiments.

For example, in the above-described embodiment, the tongue piece portion 1311 is formed in a substantially triangular shape with a chamfered corner when viewed along the rotation axis L of the impeller 30, but the present invention is not limited to this and may be formed in other shapes, and a protruding portion protruding toward the fluid discharge port 12 side may be formed on a second side wall surface of the tongue piece portion 1311 facing the fluid discharge port 12.

Further, in the above embodiment, the inner peripheral surface of the housing portion 13 has the shape of an involute curve when viewed along the rotation axis L of the impeller 30, and the fluid discharge port 12 is located between the start point ST and the end point ED of the involute curve, but the present invention is not limited to this, and the inner peripheral surface of the housing portion 13 may be formed in a circular shape, and in this case, the fluid discharge port 12 may extend along a tangent line of the circular shape so as to be offset from the rotation axis L of the impeller 30, or may extend in a radial direction around the rotation axis L of the impeller 30.

Further, in the above embodiment, the fluid discharge port 12 extends along a tangent line at the end point ED of the involute curve, but the present invention is not limited thereto, and the fluid discharge port 12 may not extend along a tangent line at the end point ED of the involute curve.

In the above embodiment, the wall thickness of the tongue portion 1311 of the housing portion 13 is increased as it approaches the fluid discharge port 12, but the present invention is not limited to this, and the wall thickness of the tongue portion 1311 of the housing portion 13 may be formed to be constant.

Further, in the above embodiment, the height of the portion GP1 of the guide portion GP, which is distant from the fluid discharge port 12, protruding from the axially facing surface P2 of the motor case side step portion MP is gradually increased as it approaches the fluid discharge port 12, but is not limited thereto, and the portion GP1 may not be included.

Further, in the above embodiment, the tip of the guide portion GP protrudes toward the one side L1 in the extending direction of the rotation axis L from the bottom surface of the other side L2 in the extending direction of the rotation axis L of the fluid discharge port 12, but the present invention is not limited thereto, and the tip of the guide portion GP may be formed flush with the bottom surface of the other side L2 in the extending direction of the rotation axis L of the fluid discharge port 12 or flush with the other side L2 in the extending direction of the rotation axis L from the bottom surface.

In the above embodiment, the motor housing side step portion MP has the guide portion GP facing the pump housing side step portion PP on the radially inner side at the position facing the fluid discharge port 12, but the present invention is not limited to this, and the guide portion GP may not be provided.

Further, in the above-described embodiment, the fluid suction port 11 extends in the extending direction of the rotation axis L of the impeller 30, but is not limited to this, and the orientation of the fluid suction port 11 may be appropriately adjusted according to circumstances.

It should be understood that the present invention can freely combine the respective components in the embodiments or appropriately change or omit the respective components in the embodiments within the scope thereof.

Claims (9)

1. A pump device comprising a pump housing having a fluid suction port, a fluid discharge port, and a housing portion that houses an impeller, and a motor housing that houses a motor that drives the impeller,

the fluid discharge port extends radially outward with respect to the rotational axis of the impeller,

a tongue portion is provided on an inner peripheral surface of the housing portion at a position close to the fluid discharge port in a circumferential direction around a rotational axis of the impeller,

a step portion is provided between the tongue portion and the fluid discharge port in a circumferential direction around a rotational axis of the impeller.

2. The pump apparatus of claim 1,

when viewed along the rotation axis of the impeller, the inner peripheral surface of the housing portion is in the shape of an involute, and the fluid discharge port is located between the start point and the end point of the involute.

3. The pump apparatus of claim 2,

the fluid discharge port extends along a tangent line at an end point of the involute,

the tongue piece is provided near the start point of the involute.

4. The pump apparatus of claim 1,

the wall thickness at the tab portion of the housing portion increases as the fluid discharge port is approached.

5. The pump apparatus of claim 4,

a flat surface portion is provided on the outer peripheral surface of the housing portion at a position corresponding to the tongue portion.

6. The pump apparatus of claim 1,

the pump housing is disposed on one side in an extending direction of the rotation axis with respect to the motor housing,

a vibration welded portion connecting the pump housing and the motor housing, and a pump housing-side stepped portion and a motor housing-side stepped portion radially inward of the vibration welded portion are formed at a butted portion between the pump housing and the motor housing,

the pump housing-side step portion and the motor housing-side step portion have axially opposing surfaces that are opposed to each other so as to be close to each other in the extending direction at a position closer to one side in the extending direction of the rotation axis than the vibration welded portion.

7. The pump apparatus of claim 6,

the motor housing side step portion has a guide portion facing the pump housing side step portion on a radially inner side in an extending direction of the fluid discharge port,

the guide portion has an inclined surface on one side in the extending direction of the rotation axis, the inclined surface being located radially outward.

8. The pump apparatus of claim 7,

a height of a portion of the guide portion that is away from the fluid discharge port, which protrudes from the axially opposing face of the motor housing-side step portion, gradually increases as it approaches the fluid discharge port.

9. The pump apparatus of claim 7,

the leading end of the guide portion protrudes toward one side in the extending direction of the rotation axis from a bottom surface of the fluid discharge port on the other side in the extending direction of the rotation axis.

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