Pump device

Abstract

A pump device contributes to reducing noise during operation. A pump device according to the present invention is provided with a housing in which a pump chamber in which an impeller member is provided, a fluid suction pipe communicating with a suction port of the pump chamber, and a fluid discharge pipe communicating with a discharge port of the pump chamber are formed, the impeller member being rotatably supported by the housing via a shaft portion. The housing is internally provided with a receiving part which restricts the movement of the shaft part on one side in the axial direction close to the suction inlet, and a plurality of supporting parts which connect the receiving part with the housing and are arranged around the center line of the suction inlet. The fluid suction pipe extends in a first direction away from a center line of the suction port when viewed in an extension direction of the center line of the suction port, and in a plurality of support portions closer to a second direction opposite to the first direction than the center line of the suction port when viewed in the extension direction, the fluid suction pipe extends in a first direction away from the center line of the suction port. The bisector of the part between the two supporting parts closest to the second direction coincides with the center line of the fluid suction pipe.

Description

Technical Field

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

[0002] In the past, there was a pump device having a housing, the housing forming a pump chamber for setting an impeller component, a fluid suction pipe connected to the suction port of the pump chamber, and a fluid discharge pipe connected to the discharge port of the pump chamber, the impeller component being rotatably supported on the housing via a shaft, and a receiving portion for limiting the movement of the shaft portion on the axial side close to the suction port, and a plurality of supporting portions connecting the receiving portion to the housing and arranged around the center line of the suction port.

[0003] In the above-mentioned pump device, it is sometimes necessary to arrange the fluid suction pipe to extend from the suction port toward a first direction perpendicular to the extension direction of the center line of the suction port when observed along the extension direction of the center line of the suction port. However, the inventor of the present application found that in this case, the noise generated by the pump device during operation is greater than that in the case where the fluid suction pipe extends from the suction port along the extension direction of the center line of the suction port. Summary of the invention

[0004] The present invention is accomplished in view of the above-mentioned problems, and an object of the present invention is to provide a pump device that helps to reduce noise during operation.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a pump device, comprising a shell, the shell forming a pump chamber for setting an impeller component, a fluid suction pipe connected to the suction port of the pump chamber, and a fluid discharge pipe connected to the discharge port of the pump chamber, the impeller component is rotatably supported on the shell via an axis, and a receiving portion is provided in the shell for limiting the movement of the axis on the axial side close to the suction port, and a plurality of supporting portions are connected to the shell and arranged around the center line of the suction port, the fluid suction pipe extends in a first direction away from the center line of the suction port when viewed along the extension direction, wherein, when viewed along the extension direction, among the plurality of supporting portions that are closer to the center line of the suction port in a second direction opposite to the first direction, the bisector of the portion between the two supporting portions closest to the second direction coincides with the center line of the fluid suction pipe.

[0006] According to the pump device of the present invention, when observed along the extension direction of the center line of the suction port, among the multiple support parts that are closer to the second direction opposite to the first direction than the center line of the suction port, the bisector of the part between the two support parts closest to the second direction is consistent with the center line of the fluid suction pipe, thereby helping to reduce noise during operation.

[0007] Furthermore, in the pump device of the present invention, it is preferable to include a receiving member having the receiving portion and the supporting portion and formed separately from the housing, and having a fixing portion fixed to the housing.

[0008] The pump device according to the present invention has a receiving component, which is formed with a receiving portion and a supporting portion and is formed separately from the shell. The receiving component also has a fixing portion fixed to the shell, thereby helping to simplify the manufacturing process of the fluid suction pipe portion of the shell.

[0009] Furthermore, in the pump device of the present invention, the housing preferably has a cylindrical portion surrounding the suction port, the fixing portion is embedded in the cylindrical portion, and an end portion of one axial side of the fixing portion is closer to the other axial side than an end portion of one axial side of the cylindrical portion.

[0010] According to the pump device of the present invention, the shell has a cylindrical portion surrounding the suction port, the fixing portion is embedded in the cylindrical portion, and the end of one axial side of the fixing portion is closer to the other axial side than the end of one axial side of the cylindrical portion, thereby helping to smoothly introduce the fluid from the fluid suction pipe into the pump chamber.

[0011] Furthermore, in the pump device of the present invention, the support portion preferably includes a first portion extending from the receiving portion toward one side in the axial direction, and a second portion extending in a bent manner from the first portion to the fixing portion.

[0012] According to the pump device of the present invention, the supporting part includes: a first part, which extends from the receiving part toward one side in the axial direction; and a second part, which bends and extends from the first part to the fixing part, so it is easy to ensure the inner diameter of the impeller, thereby improving the performance of the pump device.

[0013] In addition, in the pump device of the present invention, it is preferred that the impeller component includes an impeller, and the impeller includes: a first annular plate portion, the first annular plate portion is centered on the center line of the shaft portion; a second annular plate portion, the second annular plate portion is centered on the center line of the shaft portion and is opposite to the first annular plate portion at an interval on the other side in the axial direction; and a plurality of blades, the plurality of blades are arranged between the first annular plate portion and the second annular plate portion, the first annular plate portion is provided with an impeller-side annular protrusion protruding toward one side in the axial direction and centered on the center line of the shaft portion, and the impeller-side annular protrusion is opposite to the fixing portion in the axial direction.

[0014] According to the pump device of the present invention, the impeller component includes an impeller, and the impeller includes: a first annular plate portion, the first annular plate portion is centered on the center line of the shaft portion; a second annular plate portion, the second annular plate portion is centered on the center line of the shaft portion and is opposite to the first annular plate portion at an interval on the other side in the axial direction; and a plurality of blades, the plurality of blades are arranged between the first annular plate portion and the second annular plate portion, the first annular plate portion is provided with an impeller-side annular protrusion protruding toward one side in the axial direction and centered on the center line of the shaft portion, the impeller-side annular protrusion is opposite to the fixing portion in the axial direction, and therefore, it is easy to ensure the inner diameter of the impeller, thereby improving the performance of the pump device.

[0015] Furthermore, in the pump device of the present invention, it is preferable that the annular protrusion faces the support portion at a distance therefrom on the radially outer side.

[0016] In addition, in the pump device of the present invention, the casing is preferably formed with a casing-side annular protrusion protruding from the periphery of the suction port toward the other side in the axial direction, and the casing-side annular protrusion is centered on the center line of the shaft and surrounds the impeller-side annular protrusion.

[0017] According to the pump device of the present invention, the casing is formed with an annular protrusion on the casing side that protrudes from the periphery of the suction port toward the other side in the axial direction. The annular protrusion on the casing side is centered on the center line of the shaft portion and surrounds the annular protrusion. Therefore, it helps to utilize the annular protrusion on the impeller side and the annular protrusion on the casing side to suppress the backflow of the fluid in the pump chamber toward the suction port.

[0018] Furthermore, in the pump device of the present invention, it is preferable that a stator is further provided, and the impeller member includes a rotor provided on the other side in the axial direction of the impeller and surrounded by the stator from the outer peripheral side.

[0019] In addition, in the pump device of the present invention, it is preferred that the receiving portion is provided with a recessed portion recessed from the other axial side toward the one axial side, the end portion of the shaft portion on the one axial side is inserted into the recessed portion in a manner spaced apart in the radial direction, and an elastic component is sleeved on the one axial side of the shaft portion and abuts against the inner circumferential surface of the recessed portion from the radial inside, and the end portion of the shaft portion on the one axial side protrudes toward the one axial side more than the elastic component.

[0020] According to the pump device of the present invention, the receiving portion is provided with a recessed portion which is recessed from the other axial side toward the one axial side, the end portion of the shaft portion on the one axial side is inserted into the recessed portion in a radially spaced manner, and an elastic component is sleeved on the one axial side of the shaft portion which abuts against the inner circumferential surface of the recessed portion from the radial inside, and the end portion of the shaft portion on the one axial side protrudes toward the one axial side more than the elastic component. Therefore, the elastic component can be used to suppress the end portion of the shaft portion on the one axial side from moving slightly in the radial direction due to smaller external vibrations, and the recess can be used to suppress the end portion of the shaft portion on the one axial side from moving significantly in the radial direction due to larger external vibrations.

[0021] Furthermore, in the pump device of the present invention, it is preferable that the plurality of support portions are arranged at equal angular intervals.

[0022] (Effects of the Invention)

[0023] According to the present invention, when observing along the extension direction of the center line of the suction port, among the multiple support parts that are closer to the second direction opposite to the first direction than the center line of the suction port, the bisector of the part between the two support parts closest to the second direction is consistent with the center line of the fluid suction pipe, thereby helping to reduce noise during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a side view schematically showing a pump device according to an embodiment of the present invention.

[0025] Figure 2 It is a side cross-sectional view schematically showing a pump device according to an embodiment of the present invention.

[0026] Figure 3 It is a bottom view schematically showing a cover and a receiving member in the pump device according to the embodiment of the present invention.

[0027] Figure 4 It is a bottom view schematically showing a cover in the pump device according to the embodiment of the present invention.

[0028] Figure 5 It is a cross-sectional perspective view schematically showing a cover and a receiving member in the pump device according to the embodiment of the present invention.

[0029] Figure 6 It is a perspective view schematically showing a receiving member in the pump device according to the embodiment of the present invention.

[0030] Figure 7 This is another perspective view schematically showing the receiving member in the pump device according to the embodiment of the present invention.

[0031] (Explanation of symbols)

[0032] 1 Pump unit

[0033] 10 Housing

[0034] 11 Pump casing

[0035] 111 Cylinder

[0036] 112 Top

[0037] 1121 Ribs

[0038] 113 Shell side annular protrusion

[0039] 12 Motor housing

[0040] 121 barrel

[0041] 122 Partition wall

[0042] 1221 Ring

[0043] 1222 cylindrical part

[0044] 1223 plate-shaped part

[0045] 13 Hood

[0046] 20 Impeller parts

[0047] 21 Impeller

[0048] 211 first annular plate portion

[0049] 2111 Impeller side annular protrusion

[0050] 212 second annular plate portion

[0051] 213 Blade

[0052] 22 Rotor

[0053] 221 Main body

[0054] 222 Magnet

[0055] 30 Shaft

[0056] 40 Attachment parts

[0057] 41 Undertaking Department

[0058] 411 concavity

[0059] 42 Supporting part

[0060] 421 Part 1

[0061] 422 Part 2

[0062] 43 Fixed part

[0063] 431 Depression

[0064] 50 Stator

[0065] 51 stator core

[0066] 52 Insulator

[0067] 53 Coil

[0068] 60 Circuit board

[0069] 70 Radial bearings

[0070] 80 Elastic components

[0071] IL Fluid Suction Pipe

[0072] OL Fluid discharge pipe

[0073] SP Pump Room

[0074] OP1 Inlet

[0075] LS Centerline of suction port

[0076] LD Bisector

[0077] LI Centerline of fluid suction line

[0078] X1 First direction

[0079] X2 Second direction

[0080] L1 One side on the axis

[0081] L2 The other side of the axis DETAILED DESCRIPTION

[0082] Next, combine Figures 1 to 7 A pump device according to an embodiment of the present invention is described. Figure 1 is a side view schematically showing a pump device according to an embodiment of the present invention, Figure 2 is a side sectional view schematically showing a pump device according to an embodiment of the present invention, Figure 3 is a bottom view schematically showing a cover and a receiving member in a pump device according to an embodiment of the present invention, Figure 4 is a bottom view schematically showing a cover in a pump device according to an embodiment of the present invention, Figure 5 is a cross-sectional perspective view schematically showing a cover and a receiving member in a pump device according to an embodiment of the present invention, Figure 6 is a perspective view schematically showing a receiving member in a pump device according to an embodiment of the present invention, Figure 7 This is another perspective view schematically showing the receiving member in the pump device according to the embodiment of the present invention.

[0083] Here, for convenience of explanation, the extending direction of the rotation center line of the rotor is referred to as the axial direction, the circumferential direction centered on the rotation center line is referred to as the circumferential direction, and the radial direction centered on the rotation center line is referred to as the radial direction.

[0084] (Overall structure of the pump device)

[0085] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the pump device 1 has a housing 10, which forms a pump chamber SP in which an impeller member 20 is arranged, a fluid suction pipe IL connected to a suction port OP1 of the pump chamber SP, and a fluid discharge pipe OL connected to a discharge port of the pump chamber SP. The impeller member 20 is rotatably supported by the housing 10 via a shaft portion 30. A receiving portion 41 for limiting the movement of the shaft portion 30 on one side L1 in the axial direction close to the suction port OP1 and a plurality of supporting portions 42 connecting the receiving portion 41 to the housing 10 and arranged around a center line LS of the suction port OP1 are provided in the housing 10. The fluid suction pipe IL extends in a first direction X1 away from the center line LS when viewed in the extending direction of the center line LS, and, when viewed in the extending direction of the center line LS, among the plurality of supporting portions 42 that are closer to the center line LS in a second direction X2 opposite to the first direction X1, a bisector LD of a portion between two supporting portions 42 closest to the second direction X2 coincides with the center line LI of the fluid suction pipe IL.

[0086] Here, if Figure 2 As shown, the center line LS of the suction port OP1 coincides with the center line of the shaft portion 30 and coincides with the rotation center line of the rotor.

[0087] In addition, if Figure 2 and Figure 5 As shown, the pump device 1 includes a receiving member 40 , which includes a receiving portion 41 and a supporting portion 42 and is formed separately from the housing 10 . The receiving member 40 also includes a fixing portion 43 fixed to the housing 10 .

[0088] In addition, if Figure 2 As shown, the pump device 1 further includes a stator 50, and the impeller member 20 includes an impeller 21 and a rotor 22. The rotor 21 is disposed on the other side L2 of the impeller 21 in the axial direction and is surrounded from the outer peripheral side by the stator 50. In addition, the pump device 1 further includes a circuit substrate 60, which is disposed in the housing 10, is electrically connected to the stator 50, and controls the operation of the pump device 1.

[0089] Furthermore, when the pump device 1 is in operation, the impeller 21 is rotated by the rotation of the rotor 22, and a working fluid such as water is sucked into the pump chamber SP from the fluid suction pipe IL and discharged from the fluid discharge pipe OL after being pressurized.

[0090] (Structure of the housing)

[0091] As described above, the housing 10 is formed with the pump chamber SP, the fluid suction pipe IL, and the fluid discharge pipe OL.

[0092] Here, the housing 10 is made of resin, for example, and Figure 1 and Figure 2 As shown, it includes a pump housing 11 , a motor housing 12 and a cover 13 .

[0093] like Figure 2 As shown, the pump housing 11 includes a cylindrical portion 111 extending axially with the center line of the shaft portion 30 as the center, and a top portion 112 that blocks an opening on one axial side L1 of the cylindrical portion 111. The cylindrical portion 111 is formed with a discharge port, and a fluid discharge pipe OL extending from the discharge port in a direction perpendicular to the axial direction is formed. A cylindrical portion surrounding the suction port OP1 is provided in the center of the top portion 112, and a fluid suction pipe IL extending from the suction port OP1 toward one axial side L1 and then toward a first direction X1 as a radially outer side is formed.

[0094] In addition, if Figure 2 As shown, the motor housing 12 is assembled to the pump housing 11 from the other side L2 in the axial direction, and includes a cylindrical portion 121 extending axially with the center line of the shaft portion 30 as the center, and a partition wall 122 connected to the end of the one side L1 in the axial direction of the cylindrical portion 121. The partition wall 122 includes an annular portion 1221 extending radially inward from the end of the one side L1 in the axial direction of the cylindrical portion 121, a cylindrical portion 1222 extending from the inner peripheral edge of the annular portion 1221 toward the other side L2 in the axial direction, and a plate-shaped portion 1223 closing the opening of the other side L2 in the axial direction of the cylindrical portion 1222, and a bearing portion for fixing the end of the other side L2 in the axial direction of the shaft portion 30 is provided on the plate-shaped portion 1223. The partition wall 122 and the pump housing 11 together enclose a pump chamber SP.

[0095] In addition, if Figure 2 As shown, the cover 13 is assembled to the motor case 12 from the other side L2 in the axial direction, and a space for accommodating the stator 50 and the circuit board 60 is formed between the cover 13 and the motor case 12 .

[0096] In addition, if Figure 2 As shown, the housing 10 is formed with a housing side annular protrusion 113 protruding from the periphery of the suction port OP1 toward the other side L1 in the axial direction, and the housing side annular protrusion 113 is centered on the center line of the shaft portion 30. Specifically, at the top of the pump housing 11, a housing side annular protrusion 113 protruding toward the other side L2 in the axial direction is formed at the periphery of the suction port OP1, and the housing side annular protrusion 113 surrounds the impeller side annular protrusion 2111 described below.

[0097] (Structure of impeller components)

[0098] As described above, the impeller member 20 includes the impeller 21 and the rotor 22 .

[0099] Here, if Figure 2 As shown, the impeller 21 includes: a first annular plate portion 211, which is centered on the center line of the shaft portion 30; a second annular plate portion 212, which is centered on the center line of the shaft portion 30 and is opposite to the first annular plate portion 211 at a distance on the other side L2 in the axial direction; and a plurality of blades 213, which are arranged between the first annular plate portion 211 and the second annular plate portion 212.

[0100] In addition, if Figure 2 As shown, the first annular plate portion 211 is provided with an impeller-side annular protrusion 2111 protruding toward one axial side L1 and centered on the center line of the shaft portion 30 , and the impeller-side annular protrusion 2111 is axially opposite to the fixing portion 43 of the receiving member 40 .

[0101] In addition, if Figure 2 As shown, the rotor 22 includes a main body 221 and a magnet 222. The main body 221 is cylindrical and extends axially with the center line of the shaft 30 as the center. The magnet 222 is arranged on the outer peripheral side of the main body 221. In addition, a radial bearing 70 is fixed inside the main body 221. The radial bearing 70 is rotatably sleeved on the shaft 30, and the rotor 22 is supported on the shaft 30 via the radial bearing 70.

[0102] (Structure of stator)

[0103] As described above, the stator 50 surrounds the rotor 22 from the outer peripheral side.

[0104] Here, if Figure 2 As shown, the stator 50 includes a stator core 51 having pole teeth and a coil 53 wound around the pole teeth via an insulator 52 .

[0105] In addition, the coil 53 is electrically connected to the circuit board 60 via a connector, for example.

[0106] (Structure of receiving parts)

[0107] As described above, the receiving member 40 is formed with the receiving portion 41 , the supporting portion 42 , and the fixing portion 43 .

[0108] Here, if Figure 2As shown, the receiving portion 41 is provided with a recessed portion 411 which is recessed from the other axial side L2 toward the one axial side L1, and the end of the one axial side L1 of the shaft portion 30 is inserted into the recessed portion 411 in a manner spaced apart in the radial direction. An elastic component 80 is sleeved on the one axial side L1 of the shaft portion 30 and abuts against the inner circumferential surface of the recessed portion 411 from the radial inside, and the end of the one axial side L1 of the shaft portion 30 protrudes toward the one axial side L1 than the elastic component 80.

[0109] In addition, if Figures 5 to 7 As shown, the support portion 42 includes: a first portion 421, which extends from the receiving portion 41 toward one side L1 in the axial direction; and a second portion 422, which bends from the first portion 421 toward the radially outer side and extends to the fixing portion 43. In addition, the plurality of support portions 42 are arranged at equal angles (in the example shown in the figure, they are arranged at 60 degrees in the circumferential direction). Figure 3 As shown, one of the plurality of support portions 42 that is closer to the first direction X1 is located on the center line LI of the fluid suction pipe IL.

[0110] In addition, if Figures 5 to 7 As shown, the fixing portion 43 is annular and is embedded in the cylindrical portion formed in the center of the top 112 of the pump housing 11. In addition, the end of the one side L1 of the fixing portion 43 in the axial direction is closer to the other side L2 in the axial direction than the end of the one side L1 of the cylindrical portion in the axial direction. In addition, a recess 431 is formed on the outer periphery of the fixing portion 43, and the recess 431 is provided for the rib 1121 formed in the top 112 of the pump housing 11 (see Figure 4 ) to position the receiving member 40 relative to the pump housing 11 in the circumferential direction (to prevent the receiving member 40 from rotating relative to the pump housing 11). Specifically, three recesses 431 are provided at equal angles on the outer circumferential surface of the fixing portion 43, and a rib 1121 is formed on the inner circumferential surface of the cylinder portion formed in the center of the top 112 of the pump housing 11, and the rib 1121 is engaged with one of the three recesses 431.

[0111] (Main Effects of the Present Embodiment)

[0112] According to the pump device 1 of the present embodiment, when observed along the extension direction of the center line of the suction port OP1, among the multiple support portions 41 closer to the second direction X2 opposite to the first direction X1 than the center line LS of the suction port OP1, the bisector of the portion between the two support portions 42 closest to the second direction X2 coincides with the center line LI of the fluid suction pipe IL. Therefore, the two support portions 42 closest to the second direction X2 avoid the portion with a high flow rate when the pump device 1 is working, which helps to reduce the noise when the pump device 1 is working.

[0113] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned embodiments.

[0114] For example, in the above embodiment, the center line LS of the suction port OP1 coincides with the center line of the shaft 30 , but the present invention is not limited thereto. The center line LS of the suction port OP1 may be offset from the center line of the shaft 30 .

[0115] Furthermore, in the above embodiment, the fluid suction pipe IL extends from the suction port OP1 toward one side L1 in the axial direction and then toward the first direction X1 as the radial outer side, but the present invention is not limited thereto. The fluid suction pipe IL may extend from the suction port OP1 toward a direction inclined relative to the axial direction.

[0116] Furthermore, in the above-mentioned embodiment, a recess 431 is formed in the fixing portion 43, and a rib 1121 engaging with the recess 431 is formed on the pump housing 11, but the present invention is not limited thereto. The rib may be formed in the fixing portion 43, and a recess engaged with the rib may be formed on the pump housing 11. Furthermore, the number and positions of the recess 431 and the rib 1121 are not limited to the positions shown in the figure, and may be appropriately set as needed.

[0117] Furthermore, in the above-mentioned embodiment, the receiving member 40 and the housing 10 are formed separately, but the present invention is not limited thereto, and the receiving member 40 may be formed integrally with the housing 10 .

[0118] Furthermore, in the above-mentioned embodiment, the specific shape of the receiving member 40 is not limited to the shape shown in the figure, and can be appropriately changed as needed. For example, the number and shape of the supporting parts 42 are not limited to the number and shape shown in the figure.

[0119] It should be understood that within the scope of the present invention, various parts in the embodiments can be freely combined, or various parts in the embodiments can be appropriately deformed or omitted.

Claims

1. A pump device having a housing, wherein the housing is formed with a pump chamber in which an impeller component is arranged, a fluid suction pipe connected to the suction port of the pump chamber, and a fluid discharge pipe connected to the discharge port of the pump chamber, wherein the impeller component is rotatably supported by the housing via a shaft, wherein a receiving portion is provided in the housing on one side of the axial direction close to the suction port for limiting the movement of the shaft portion, and a plurality of supporting portions are connected to the housing and are arranged around the center line of the suction port, wherein the fluid suction pipe extends in a first direction away from the center line of the suction port when viewed in the extension direction of the center line of the suction port, and wherein When viewed along the extending direction, among the plurality of support portions located closer to a second direction opposite to the first direction than the center line of the suction port, a bisector of a portion between two of the support portions closest to the second direction coincides with the center line of the fluid suction pipe.

2. The pump device according to claim 1, characterized in that With receiving parts, The receiving component is formed with the receiving portion and the supporting portion, and is formed separately from the shell. The receiving component is further formed with a fixing portion fixed to the housing.

3. The pump device according to claim 2, characterized in that The housing has a cylindrical portion surrounding the suction port, The fixing portion is embedded in the cylindrical portion, An end portion of the fixing portion on one axial direction is located closer to the other axial direction side than an end portion of the cylindrical portion on one axial direction.

4. The pump device according to claim 2, characterized in that The support portion comprises: A first portion extending from the receiving portion toward one side in the axial direction; and The second portion is bent and extends from the first portion to the fixing portion.

5. The pump device according to claim 2, characterized in that The impeller component comprises an impeller, The impeller comprises: a first annular plate portion, the first annular plate portion being centered on the center line of the shaft portion; a second annular plate portion, the second annular plate portion being centered on the center line of the shaft portion and facing the first annular plate portion with a gap therebetween on the other side in the axial direction; and a plurality of blades, the plurality of blades being arranged between the first annular plate portion and the second annular plate portion, The first annular plate portion is provided with an impeller-side annular protrusion protruding toward one side in the axial direction and centered on the center line of the shaft portion. The impeller-side annular protrusion is opposed to the fixing portion in the axial direction.

6. The pump device according to claim 5, characterized in that The housing is formed with a housing-side annular protrusion protruding from the peripheral edge of the suction port toward the other side in the axial direction. The casing-side annular protrusion is centered on the center line of the shaft portion and surrounds the impeller-side annular protrusion.

7. The pump device according to claim 5, characterized in that It also has a stator, The impeller component comprises a rotor, The rotor is provided on the other side of the impeller in the axial direction, and is surrounded by the stator from the outer peripheral side.

8. The pump device according to claim 1, characterized in that The receiving portion is provided with a recessed portion which is recessed from the other side in the axial direction toward the one side in the axial direction. One end of the shaft portion in the axial direction is inserted into the recessed portion at a distance in the radial direction. An elastic member is sleeved on one side of the shaft portion in the axial direction and contacts the inner peripheral surface of the recessed portion from the radial inner side. An end portion of the shaft portion on one side in the axial direction protrudes toward one side in the axial direction from the elastic member.

9. The pump device according to claim 1, characterized in that The plurality of support portions are arranged at equal angular intervals.

10. The pump device according to claim 1, characterized in that The center line of the shaft portion coincides with the center line of the suction port.

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