Pump device

Abstract

The pump device includes a motor (10) having a rotor, a stator surrounding the rotor on an outer peripheral side, and a resin housing (6) covering the stator, an impeller (8) disposed in a first direction (L1) of the rotor and rotating integrally with the rotor, a resin case (2) covering the impeller from a first direction of the housing and inserted into a mounting hole portion (510) formed in a mounting member (500) from a second direction (L2), a first annular seal member (11) disposed in contact with an outer peripheral surface of the case and elastically deformed in a radial direction perpendicular to an axis of rotation between the case and an inner peripheral surface of the mounting hole portion, a first restriction portion (5) disposed in the first direction of the first seal member and restricting movement of the first seal member in the first direction, and a second restriction portion (9) disposed in the second direction of the first seal member, restricting movement of the first seal member in the second direction, and provided separately from the first restriction portion.

Description

Technical Field

[0001] This invention relates to a pump device. Background Technology

[0002] Patent Document 1 describes a pump device for circulating fluid. The pump device in this document includes a motor housing and a pump housing located at one axial end of the motor housing. The motor housing houses a motor unit that serves as the power source for an electric pump. The pump housing houses a pump rotor connected to the rotating shaft of the motor unit. In use, the motor housing is inserted into a pump mounting recess.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-120568 Summary of the Invention

[0006] In a pump assembly as described in Patent Document 1, a sealing component such as an O-ring is provided between the motor housing and the pump mounting recess to prevent fluid leakage from the pump mounting recess. The sealing component undergoes radial elastic deformation between the motor housing and the pump mounting recess. In this case, the sealing component is positioned within a groove formed on the outer circumferential surface of the motor housing. The axial movement of the sealing component is restricted by the inner circumferential wall of the groove in the axial direction.

[0007] Here, when the motor housing is made of resin, a parting line is formed on the inner side of the groove when the groove is molded with resin. This results in a step on the inner side of the groove. As a result, when the sealing component is tightly attached to the inner side of the groove, a gap can easily form between the outer circumferential surface of the motor housing and the sealing component, reducing the tightness between the motor housing and the pump mounting recess, thus creating a problem where fluid can easily leak from the pump mounting recess.

[0008] In view of the above problems, the object of the present invention is to provide a pump device that is used in a state of being inserted into a mounting hole of a mounting component, wherein axial movement is restricted and the decrease in the tightness of the sealing component disposed on the outer peripheral surface of a resin housing is suppressed.

[0009] To address the aforementioned problems, one aspect of the pump device of the present invention includes: a motor having a rotor, a stator surrounding an outer periphery of the rotor, and a resin housing covering the stator; an impeller disposed in the first direction of the rotor and rotating integrally with the rotor when a direction along the rotation axis of the rotor is designated as a first direction and a direction opposite to the first direction is designated as a second direction; a resin housing covering the impeller from the first direction of the housing and inserted from the second direction into a mounting hole formed in a mounting member; an annular first sealing member disposed in contact with the outer peripheral surface of the housing and elastically deformable radially perpendicular to the rotation axis between the inner peripheral surfaces of the housing and the mounting hole; a first limiting portion disposed in the first direction of the first sealing member and limiting the movement of the first sealing member in the first direction; and a second limiting portion disposed in the second direction of the first sealing member, limiting the movement of the first sealing member in the second direction, and integrally disposed with the first limiting portion. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the pump device in this embodiment.

[0011] Figure 2 This is a perspective view of the pump device of this embodiment as viewed from the first direction.

[0012] Figure 3 This is a perspective view of the pump device of this embodiment viewed from a second direction.

[0013] Figure 4 It is an exploded perspective view of the motor, the first sealing component, and the housing.

[0014] Figure 5 This is a three-dimensional view of the shell as seen from a second direction.

[0015] Figure 6 This is a diagram showing the relationship between the first sealing member, the first limiting part, and the second limiting part.

[0016] Figure 7 This is a diagram illustrating the second protrusion in another embodiment. Detailed Implementation

[0017] (Overall structure)

[0018] Figure 1 This is a cross-sectional view of the pump device 100 of this embodiment. Figure 2 This is a perspective view of the pump device 100 of this embodiment as viewed from the first direction. Figure 3This is a perspective view of the pump device 100 of this embodiment as viewed from a second direction. Figure 4 This is an exploded perspective view of the motor 10, the first sealing component 11, and the housing 2. Figure 5 This is a three-dimensional view of the shell 2 as viewed from the second direction. Figure 6 This is a diagram showing the relationship between the first sealing member 11, the first limiting part 5, and the second limiting part 9. Here, in the diagram, L1 is a first direction along the rotation axis L, and L2 is a second direction opposite to the first direction L1.

[0019] like Figure 1 As shown, the pump device 100 of this embodiment is used with the mounting hole 510 inserted into the mounting member 500. For example, the pump device 100 is a vehicle pump where the ambient temperature and fluid temperature are easily varied, and is mounted on the mounting member 500 provided on the main body of a vehicle or the like. The pump device 100 is mounted on the mounting member 500, which serves as a cover member. At this time, the pump device 100 has a dual structure in which the housing 2 is covered by the cover member, and is fixed to the mating part side of the vehicle or the like via the cover member. When fixed to the mating part side of the vehicle or the like using the cover member, the shape of the cover member can be changed to accommodate various shapes of the mating part side.

[0020] like Figures 1 to 4 As shown, the pump assembly 100 includes: a motor 10; an impeller 8 disposed in a first direction L1 of the motor 10; a housing 2 disposed in the first direction L1 of the motor 10 and defining a pump chamber 20; a first sealing member 11 disposed between the housing 2 and the mounting hole 510; a first limiting member 5 disposed in the first direction L1 of the first sealing member 11; and a second limiting member 9 disposed in the second direction L2 of the first sealing member 11. The second limiting member 9 and the first limiting member 5 are separate components.

[0021] The motor 10 includes: a cylindrical stator 3; a rotor 4 disposed inside the stator 3; a resin housing 6 covering the stator 3; and a support shaft 16 supporting the rotor 4 in a rotatable rod shape. The support shaft 16 is made of metal or ceramic.

[0022] like Figure 1 As shown, the stator 3 includes: a stator core 31; an insulator 32 held by the stator core 31; and a coil 35 wound on the stator core 31 with the insulator 32 in between.

[0023] Rotor 4 rotates around the axis of rotation L. For example... Figure 1As shown, the rotor 4 includes: a radial bearing 13, with a support shaft 16 passing through the inner circumference of the radial bearing 13; a cylindrical portion 40 that holds the radial bearing 13 inside; and a magnet 15 that is held outside the cylindrical portion 40. The cylindrical portion 40 is a resin molded part, and the radial bearing 13 is embedded within the cylindrical portion 40. The cylindrical portion 40 opens into the pump chamber 20. An impeller 8 is connected to the end of the cylindrical portion 40 in the first direction L1. The magnet 15 is a rare-earth magnet.

[0024] The outer casing 6 is composed of resin sealing components that cover the stator 3 from both radial sides and both sides along the rotation axis L. The resin sealing components are the resin portions used when the stator 3 is embedded and molded using polyphenylene sulfide (PPS) or the like.

[0025] like Figures 1 to 3 As shown, the outer casing 6 includes: a main body portion 61 that covers the stator 3 radially outward; and a cylindrical portion 62 disposed at the end of the main body portion 61 in a second direction L2. A circuit board 19 is disposed inside the cylindrical portion 62, which includes circuitry for controlling the power supply to the coil 35. A cover 18 is fixed to the end of the cylindrical portion 62 in the second direction L2.

[0026] The main body 61 includes a second protrusion 63 and a flange 64. The second protrusion 63 and the flange 64 protrude annularly from the outer peripheral surface of the main body 61. The second protrusion 63 is located closer to the center of the main body 61 in the first direction L1 and near the end of the main body 61 in the first direction L1. The flange 64 is located further to the second direction L2 than the second protrusion 63. The outer diameter of the flange 64 is larger than the outer diameter of the second protrusion 63. When the housing 2 is inserted into the mounting hole 510, the flange 64 contacts the mounting surface 530 of the mounting member 500 and positions the pump assembly 100 relative to the mounting member 500 in the first direction L1. In this embodiment, the second limiting portion 9 is the second protrusion 63. The second protrusion 63 is disposed on the first sealing member 11 in the second direction L2, restricting the movement of the first sealing member 11 in the second direction L2.

[0027] The casing 2 is made of resin. For example... Figure 1 As shown, when the pump assembly 100 is installed on the mounting member 500, the housing 2 is inserted from the second direction L2 into the mounting hole 510 formed in the mounting member 500. Figures 1 to 5As shown, the housing 2 includes: a first sidewall portion 23 that surrounds the impeller 8 radially outward; an annular connecting plate portion 24 that protrudes radially outward from the end of the first sidewall portion 23 in a second direction L2 and faces the first end face 65 of the housing 6 facing the first direction L1; and a second sidewall portion 25 that protrudes from the outer periphery of the connecting plate portion 24 along the second direction L2 to surround the housing 6, and a first sealing member 11 is disposed on its outer peripheral surface. The second sidewall portion 25 is circular about the axis of rotation L.

[0028] The housing 2 includes a first protrusion 29 that projects radially outward from the outer periphery of the second sidewall portion 25 in an annular shape. For example... Figure 6 As shown, the outer diameter of the first protrusion 29 is approximately equal to the outer diameter of the second protrusion 63. In this embodiment, the first limiting part 5 is the first protrusion 29. The first protrusion 29 is disposed on the first sealing member 11 in the first direction L1, limiting the movement of the first sealing member 11 in the first direction L1.

[0029] The housing 2 includes: a top plate portion 26 located in a first direction L1 of the first side wall portion 23 and covering the impeller 8 from the first direction L1; a suction pipe 21 protruding from the center portion of the top plate portion 26 in the first direction; and a discharge pipe 22 extending in a direction perpendicular to the rotation axis L. The suction pipe 21 is cylindrical about the rotation axis L. The suction pipe 21 is inserted into a flow path pipe 520 provided inside the mounting hole portion 510. A stepped portion 211 is provided on the outer peripheral surface of the suction pipe 21, facing the first direction L1. An annular second sealing member 12 is disposed on the stepped portion 211. The second sealing member 12 is an O-ring that elastically deforms between the outer peripheral surface of the suction pipe 21 and the inner peripheral surface of the flow path pipe 520 when the suction pipe 21 is inserted into the flow path pipe 520. The discharge pipe 22 is inserted into an outlet pipe (not shown) provided inside the mounting hole portion 510.

[0030] like Figure 1 As shown, a fixing part 17 for fixing the housing 2 and the outer shell 6 is provided between the connecting plate portion 24 and the first end face 65. In this embodiment, the fixing part 17 is a welded part 171 formed by welding the protrusion 27 provided on the connecting plate portion 24 to the first end face 65. At this time, a gap S is formed between the second side wall portion 25 and the outer peripheral surface of the main body portion 61 of the outer shell 6.

[0031] The first sealing component 11 is an O-ring. The first sealing component 11 is configured to contact the outer peripheral surface of the housing 2, and elastically deforms radially orthogonal to the axis of rotation L between the inner peripheral surface of the housing 2 and the mounting hole 510. Figure 6As shown, when the housing 2 is not inserted into the mounting hole 510, viewed from the second direction L2, the first sealing member 11 protrudes radially outward from the first protrusion 29 by a dimension less than half the radial width of the first sealing member 11. In this embodiment, when the first sealing member 11 elastically deforms between the inner circumferential surface of the housing 2 and the mounting hole 510, the first sealing member 11 also comes into close contact with the first protrusion 29 and the second protrusion 63.

[0032] The impeller 8 is made of resin. The impeller 8 is driven by the motor 10 to rotate about the axis of rotation L. When the impeller 8 and rotor 4 rotate together about the axis of rotation L, driven by the motor 10, the fluid in the pump chamber 20 flows in the direction of rotation. This generates centrifugal force, creating a low pressure on the radially inner side and a high pressure on the radially outer side. The fluid is drawn in through the suction port of the suction pipe 21 and discharged from the discharge port of the discharge pipe 22.

[0033] (Effects)

[0034] The pump device 100 of this embodiment includes: a resin housing 2 that covers the impeller 8 from a first direction L1 of the outer casing 6 and is inserted into a mounting hole 510 formed in the mounting member 500 from a second direction L2; an annular first sealing member 11 that is disposed in contact with the outer peripheral surface of the housing 2 and elastically deforms radially perpendicular to the axis of rotation between the inner peripheral surface of the housing 2 and the mounting hole 510; a first limiting portion 5 disposed on the first sealing member 11 in the first direction L1 to limit the movement of the first sealing member 11 in the first direction L1; and a second limiting portion 9 disposed on the first sealing member 11 in the second direction L2 to limit the movement of the first sealing member 11 in the second direction L2, and is separately disposed from the first limiting portion 5. The first limiting portion 5 is a first protrusion 29 that protrudes radially outward from the outer peripheral surface of the housing 2. The second limiting portion 9 is a second protrusion 63 that protrudes radially outward from the outer peripheral surface of the main body portion 61 of the outer casing 6.

[0035] Therefore, by separately providing the first protrusion 29 and the second protrusion 63, a resin housing 2 having the first protrusion 29 can be formed without forming a parting line on the outer peripheral surface of the main body 61 that contacts the first sealing member 11. As a result, no steps are formed on the outer peripheral surface of the main body 61, improving the tightness between the first sealing member 11 and the outer peripheral surface of the main body 61 and suppressing fluid leakage from the mounting hole 510.

[0036] The housing 2 includes: a first sidewall portion 23 that surrounds the impeller 8 radially outward; an annular connecting plate portion 24 that protrudes radially outward from the end of the first sidewall portion 23 in a second direction L2 and faces the first end face 65 of the housing 6 facing the first direction L1; and a second sidewall portion 25 that protrudes from the outer periphery of the connecting plate portion 24 along the second direction L2 to surround the housing 6, and a first sealing member 11 is disposed on its outer peripheral surface. A fixing portion 17 for fixing the housing 2 and the housing 6 is provided between the connecting plate portion 24 and the first end face 65. The fixing portion 17 is a welded portion 171 formed by welding the connecting plate portion 24 and the first end face 65. A gap S is formed between the second sidewall portion 25 and the outer peripheral surface of the main body portion 61 of the housing 6. As a result, molten resin remains in the gap S when the welded portion 171 is formed, which can suppress resin leakage to the outside of the housing 2.

[0037] The housing 2 includes: a top plate portion 26 located in a first direction L1 of the first side wall portion 23 and covering the impeller 8 from the first direction L1; and a suction pipe 21 protruding from the center portion of the top plate portion 26 along the first direction L1 and inserted into a flow path pipe 520 disposed inside the mounting hole portion 510. The second side wall portion 25 and the suction pipe 21 are formed coaxially with the rotation axis L. A second sealing member 12 is disposed at the front end of the suction pipe 21. As a result, the positions of the first sealing member 11 disposed on the outer peripheral surface of the second side wall portion 25 and the second sealing member 12 disposed on the outer peripheral surface of the suction pipe 21 can be appropriately controlled, thereby suppressing the decrease in the tightness of the first sealing member 11 and the second sealing member 12.

[0038] The first sealing member 11 is an O-ring. The first sealing member 11 protrudes radially outward from the first protrusion 29 by a dimension less than half the radial width of the first protrusion 29. As a result, the amount of elastic deformation of the first sealing member 11 can be appropriately controlled.

[0039] (Other implementation methods)

[0040] Figure 7 This is a diagram illustrating the second protrusion 63A of another embodiment. (See diagram) Figure 7 As shown, in another embodiment, when viewed from the second direction L2, the second protrusion 63A extends radially outward than the first protrusion 29. Thus, when the housing 2 is inserted into the mounting hole 510, the second protrusion 63A contacts the mounting surface 530 of the mounting member 500, thereby positioning the pump assembly 100 relative to the mounting member 500 in the first direction L1.

[0041] (Modified example)

[0042] In the above embodiment, the first limiting part 5 is a first protrusion 29 that protrudes radially outward from the outer periphery of the second side wall portion 25 of the housing 2, but the first limiting part 5 is not limited to the first protrusion 29. The first limiting part 5 can be provided at a location other than the housing 2.

[0043] The second limiting part 9 is a second protrusion 63 that protrudes in a ring shape from the outer peripheral surface of the outer casing 6, but the second limiting part 9 is not limited to the second protrusion 63. The second limiting part 9 can have any structure, as long as it is separately provided from the first limiting part 5.

[0044] In the above embodiment, the fixing part 17 is a welded part 171 formed by welding the connecting plate part 24 to the first end face 65, but the fixing part 17 is not limited to the welded part 171. For example, the fixing part 17 may be a screw that fixes the connecting plate part 24 and the first end face 65 together.

[0045] In the above embodiment, the second protrusion 63 is located closer to the center of the main body 61 in the first direction L1 and near the end of the main body 61 in the first direction L1. However, the second protrusion 63 is not limited to this location. The second protrusion 63 may be located near the center of the main body 61 or in a position closer to the center of the main body 61 in the second direction.

[0046] This technology can be configured as follows.

[0047] (Technical Solution 1)

[0048] A pump device, comprising:

[0049] A motor having a rotor, a stator surrounding the outer periphery of the rotor, and a resin housing covering the stator;

[0050] When the impeller is positioned along the rotation axis of the rotor as a first direction and the opposite direction as a second direction, the impeller is disposed in the first direction of the rotor and rotates integrally with the rotor.

[0051] A resin housing that covers the impeller from the first direction of the outer shell and is inserted from the second direction into a mounting hole formed in the mounting component;

[0052] An annular first sealing member is configured to contact the outer peripheral surface of the housing and elastically deforms radially perpendicular to the axis of rotation between the inner peripheral surfaces of the housing and the mounting hole.

[0053] A first limiting portion is disposed on the first sealing member in the first direction and limits the movement of the first sealing member in the first direction; and

[0054] A second limiting part is disposed in the second direction of the first sealing member to restrict the movement of the first sealing member in the second direction, and is integrally disposed with the first limiting part.

[0055] (Technical Solution 2)

[0056] According to the pump device described in technical solution 1, wherein,

[0057] The first limiting portion is a first protrusion that protrudes radially outward from the outer peripheral surface of the housing.

[0058] The second limiting portion is a second protrusion that protrudes radially outward from the outer peripheral surface of the housing.

[0059] (Technical Solution 3)

[0060] According to the pump device described in technical solution 2, wherein,

[0061] The housing includes: a first sidewall portion that surrounds the impeller from the radially outer side; an annular connecting plate portion that protrudes from the second-direction end of the first sidewall portion toward the radially outer side and faces a first end face of the housing facing the first direction; and a second sidewall portion that protrudes from the outer periphery of the connecting plate portion toward the second direction to surround the housing, and has the first sealing member disposed on its outer peripheral surface.

[0062] A fixing part is provided between the connecting plate portion and the first end face to fix the housing and the outer shell.

[0063] (Technical Solution 4)

[0064] According to the pump device described in technical solution 3, wherein...

[0065] The fixing part is a welded part formed by fusing the connecting plate part to the first end face.

[0066] A gap is formed between the second sidewall portion and the outer peripheral surface of the outer casing.

[0067] (Technical Solution 5)

[0068] According to the pump device described in technical solution 4, wherein...

[0069] The housing includes: a top plate portion located in the first direction of the first side wall portion and covering the impeller from the first direction; and a suction pipe protruding from the center portion of the top plate portion toward the first direction and inserted into a flow path pipe disposed inside the mounting hole portion.

[0070] The second sidewall portion is formed coaxially with the suction tube and the axis of rotation.

[0071] A second sealing component is provided at the front end of the inhalation tube.

[0072] (Technical Solution 6)

[0073] The pump device according to any one of technical solutions 2 to 5, wherein,

[0074] The first sealing component is an O-ring.

[0075] The first sealing member protrudes radially outward from the first protrusion by a dimension less than half the radial width of the first sealing member.

[0076] (Technical Solution 7)

[0077] The pump device according to any one of technical solutions 2 to 6, wherein,

[0078] The second protrusion extends outward in the radial direction compared to the first protrusion.

[0079] Symbol Explanation

[0080] 100... Pump assembly, 2... Housing, 3... Stator, 4... Rotor, 5... First limiting part, 6... Outer casing, 8... Impeller, 9... Second limiting part, 10... Motor, 11... First sealing component, 12... Second sealing component, 13... Radial bearing, 15... Magnet, 16... Support shaft, 17... Fixing part, 18... Cover, 19... Circuit board, 20... Pump chamber, 21... Suction pipe, 22... Discharge pipe, 23... First side wall, 24... Connecting plate, 25... Second side wall Part, 26...top plate part, 27...protrusion, 29...first protrusion, 31...stor core, 32...insulator, 35...coil, 40...cylindrical part, 61...main body part, 62...cylindrical part, 63, 63A...second protrusion, 64...flange part, 65...first end face, 171...welded part, 211...step part, 221...outlet, 500...mounting component, 510...mounting hole part, 520...flow path pipe, 530...mounting surface, L...rotation axis, S...gap.

Claims

1. A pump device, characterized in that, include: A motor having a rotor, a stator surrounding the outer periphery of the rotor, and a resin housing covering the stator; When the impeller is positioned along the rotation axis of the rotor as a first direction and the opposite direction as a second direction, the impeller is disposed in the first direction of the rotor and rotates integrally with the rotor. A resin housing that covers the impeller from the first direction of the outer casing and is inserted from the second direction into a mounting hole formed in the mounting member; An annular first sealing member is configured to contact the outer peripheral surface of the housing and elastically deforms radially perpendicular to the axis of rotation between the inner peripheral surfaces of the housing and the mounting hole. A first limiting part is disposed in the first direction of the first sealing member and restricts the movement of the first sealing member in the first direction; as well as A second limiting part is disposed in the second direction of the first sealing member to restrict the movement of the first sealing member in the second direction, and is integrally disposed with the first limiting part.

2. The pump device according to claim 1, characterized in that, The first limiting portion is a first protrusion that protrudes radially outward from the outer peripheral surface of the housing. The second limiting portion is a second protrusion that protrudes radially outward from the outer peripheral surface of the housing.

3. The pump device according to claim 2, characterized in that, The housing includes: a first sidewall portion that surrounds the impeller from the radially outer side; an annular connecting plate portion that protrudes from the second-direction end of the first sidewall portion toward the radially outer side and faces a first end face of the housing facing the first direction; and a second sidewall portion that protrudes from the outer periphery of the connecting plate portion toward the second direction to surround the housing, and has the first sealing member disposed on its outer peripheral surface. A fixing part is provided between the connecting plate portion and the first end face to fix the housing and the outer shell.

4. The pump device according to claim 3, characterized in that, The fixing part is a welded part formed by fusing the connecting plate part to the first end face. A gap is formed between the second sidewall portion and the outer peripheral surface of the outer casing.

5. The pump device according to claim 3 or 4, characterized in that, The housing includes: a top plate portion located in the first direction of the first sidewall portion and covering the impeller from the first direction; and a suction pipe protruding from the center portion of the top plate portion toward the first direction and inserted into a flow path pipe disposed inside the mounting hole portion. The second sidewall portion and the suction tube are formed to be coaxial with the axis of rotation. A second sealing component is provided at the front end of the inhalation tube.

6. The pump device according to claim 2, characterized in that, The first sealing component is an O-ring. The first sealing member protrudes radially outward from the first protrusion by a dimension less than half the radial width of the first sealing member.

7. The pump device according to claim 2, characterized in that, The second protrusion extends outward in the radial direction compared to the first protrusion.

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