Pumping device

Abstract

The objective is to provide a pump device that, when used while inserted into a mounting hole of a mounting member, restricts axial movement and suppresses a decrease in the adhesion of a sealing member arranged on the outer surface of a resin case. [Solution] The pump device 100 includes a resin case 2 that covers the impeller 8 from a first direction L1 of the housing 6 and is inserted from a second direction L2 into a mounting hole 510 formed in the mounting member 500; an annular first sealing member 11 that is positioned in contact with the outer circumferential surface of the case and elastically deforms in a radial direction perpendicular to the axis of rotation between the case and the inner circumferential surface of the mounting hole; a first restricting part 5 positioned in the first direction of the first sealing member and restricting the movement of the first sealing member in the first direction; and a second restricting part 9, which is provided separately from the first restricting part 5 and positioned in the second direction of the first sealing member and restricting the movement of the first sealing member in the second direction.

Description

Technical Field

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

Background Art

[0002] A pump device for circulating a fluid is described in Patent Document 1. The pump device of this document includes a motor case and a pump case provided at one axial end of the motor case. Inside the motor case, a motor unit as a power source of an electric pump is accommodated. Inside the pump case, a pump rotor connected to the rotating shaft of the motor unit is accommodated. The pump device is used in a state where the motor case is inserted into a pump mounting recess.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a pump device such as that of Patent Document 1, a sealing member such as an O-ring is provided between the motor case and the pump mounting recess in order to suppress leakage of fluid from the pump mounting recess. The sealing member elastically deforms between the motor case and the pump mounting recess in the radial direction. In this case, the sealing member is disposed in a groove formed on the outer peripheral surface of the motor case. The axial movement of the sealing member is restricted by the inner peripheral wall in the axial direction of the groove.

[0005] In the case where the motor case is made of resin, a parting line is formed on the inside of the groove when the groove is molded from resin. This creates a step on the inside of the groove. As a result, when the sealing member is in close contact with the inside of the groove, a gap is likely to form between the outer surface of the motor case and the sealing member, reducing the airtightness between the motor case and the pump mounting recess, which can lead to fluid leakage from the pump mounting recess.

[0006] In view of the above problems, the object of the present invention is to provide a pump device that, when used while inserted into a mounting hole of a mounting member, restricts movement in the axial direction and suppresses a decrease in the adhesion of a sealing member arranged on the outer surface of a resin case. [Means for solving the problem]

[0007] To solve the above problems, one embodiment of the pump device of the present invention comprises a motor having a rotor, a stator surrounding the outer circumference of the rotor, and a resin housing covering the stator, If we define a first direction along the rotation axis of the rotor and a second direction opposite to the first direction, then an impeller is positioned in the first direction of the rotor and rotates integrally with the rotor, A resin case covers the impeller from the first direction of the housing and is inserted from the second direction into a mounting hole formed in the mounting member, An annular first sealing member is positioned in contact with the outer circumferential surface of the case and elastically deforms in a radial direction perpendicular to the axis of rotation between the case and the inner circumferential surface of the mounting hole, A first restricting portion is positioned in the first direction of the first sealing member and restricts the movement of the first sealing member in the first direction, A second restricting portion, which is provided separately from the first restricting portion, is positioned in the second direction of the first sealing member and restricts the movement of the first sealing member in the second direction. It is characterized by having the following features. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a cross-sectional view of the pump device according to this embodiment. [Figure 2] Figure 2 is a perspective view of the pump device of this embodiment, taken from a first direction. [Figure 3] Figure 3 is a perspective view of the pump device of this embodiment, taken from a second direction. [Figure 4] Figure 4 is an exploded perspective view of the motor, the first sealing member, and the case. [Figure 5] Figure 5 is a perspective view of the case from a second direction. [Figure 6] Figure 6 shows the relationship between the first sealing member, the first restricting section, and the second restricting section. [Figure 7] Figure 7 illustrates the second projection of another embodiment. [Modes for carrying out the invention]

[0009] (Overall structure) Figure 1 is a cross-sectional view of the pump device 100 of this embodiment. Figure 2 is a perspective view of the pump device 100 of this embodiment from a first direction. Figure 3 is a perspective view of the pump device 100 of this embodiment from a second direction. Figure 4 is an exploded perspective view of the motor 10, the first sealing member 11, and the case 2. Figure 5 is a perspective view of the case 2 from a second direction. Figure 6 is a diagram showing the relationship between the first sealing member 11, the first regulating part 5, and the second regulating part 9. Here, in the figure, L1 is the first direction along the rotation axis L, and L2 is the second direction opposite to the first direction L1.

[0010] As shown in Figure 1, the pump device 100 in this embodiment is used in a state where it is inserted into the mounting hole 510 of the mounting member 500. For example, the pump device 100 is used as an on-board pump where ambient temperature and fluid temperature are prone to change, and is attached to the mounting member 500 provided on the main body of a vehicle or the like. Alternatively, the pump device 100 can be attached to the mounting member 500 as a cover member. In this case, the pump device 100 has a double-layered structure with the case 2 covered by the cover member, and is fixed to the other side, such as a vehicle, via the cover member. When fixed to the other side, such as a vehicle, using the cover member, the shape of the cover member can be changed to accommodate various shapes of the other side.

[0011] In Figures 1 to 4, the pump device 100 includes a motor 10, an impeller 8 positioned in a first direction L1 of the motor 10, a case 2 positioned in the first direction L1 of the motor 10 and partitioning the pump chamber 20, a first sealing member 11 positioned between the case 2 and the mounting hole 510, a first restricting section 5 positioned in the first direction L1 of the first sealing member 11, and a second restricting section 9 positioned in the second direction L2 of the first sealing member 11. The second restricting section 9 is provided separately from the first restricting section 5.

[0012] The motor 10 comprises a cylindrical stator 3, a rotor 4 positioned inside the stator 3, a resin housing 6 covering the stator 3, and a round rod-shaped support shaft 16 that rotatably supports the rotor 4. The support shaft 16 is made of metal or ceramic.

[0013] As shown in Figure 1, the stator 3 comprises a stator core 31, an insulator 32 held by the stator core 31, and a coil 35 wound around the stator core 31 via the insulator 32.

[0014] The rotor 4 rotates about the rotation axis L. As shown in FIG. 1, the rotor 4 includes a radial bearing 13 through which a support shaft 16 is inserted on the inner peripheral side, a cylindrical portion 40 that holds the radial bearing 13 inside, and a magnet 15 held outside the cylindrical portion 40. The cylindrical portion 40 is a resin molded product in which the radial bearing 13 is insert-molded. The cylindrical portion 40 opens in the pump chamber 20. An impeller 8 is connected to an end of the cylindrical portion 40 in the first direction L1. The magnet 15 is a rare earth magnet.

[0015] The housing 6 is composed of a resin sealing member that covers the stator 3 from both sides in the radial direction and both sides along the rotation axis L. The resin sealing member is the resin part when the stator 3 is insert-molded with polyphenylene sulfide (PPS) or the like.

[0016] As shown in FIGS. 1 to 3, the housing 6 includes a body portion 61 that covers the stator 3 from the outside in the radial direction, and a cylindrical portion 62 provided at an end of the body portion 61 in the second direction L2. Inside the cylindrical portion 62, a circuit board 19 provided with a circuit for controlling power supply to the coil 35 and the like is disposed. A cover 18 is fixed to an end of the cylindrical portion 62 in the second direction L2.

[0017] The body portion 61 includes a second protruding portion 63 and a flange portion 64. The second protruding portion 63 and the flange portion 64 project annularly from the outer peripheral surface of the body portion 61. The second protruding portion 63 is in the first direction L1 from the center of the body portion 61 and is located near an end of the body portion 61 in the first direction L1. The flange portion 64 is located in the second direction L2 from the second protruding portion 63. The outer diameter dimension of the flange portion 64 is larger than the outer diameter dimension of the second protruding portion 63. When the case 2 is inserted into the mounting hole portion 510, the flange portion 64 contacts the mounting surface 530 of the mounting member 500 to position the pump device 100 in the first direction L1 with respect to the mounting member 500. In this embodiment, the second regulating portion 9 is the second protruding portion 63. The second protruding portion 63 is disposed in the second direction L2 of the first sealing member 11 and regulates the movement of the first sealing member 11 in the second direction L2.

[0018] Case 2 is made of resin. As shown in FIG. 1, when the pump device 100 is attached to the attachment member 500, the case 2 is inserted into the attachment hole 510 formed in the attachment member 500 from the second direction L2. As shown in FIGS. 1 to 5, the case 2 includes a first side wall portion 23 that surrounds the impeller 8 from the outside in the radial direction, an annular connection plate portion 24 that protrudes radially outward from the end portion of the first side wall portion 23 in the second direction L2 and faces the first end surface 65 of the housing 6 facing the first direction L1, and a second side wall portion 25 that protrudes in the second direction L2 from the outer peripheral edge of the connection plate portion 24 to surround the housing 6 and has the first sealing member 11 disposed on its outer peripheral surface. The second side wall portion 25 has a circular shape centered on the rotation axis L.

[0019] The case 2 includes a first protrusion 29 that protrudes annularly radially outward from the outer peripheral surface of the second side wall portion 25. As shown in FIG. 6, the outer diameter dimension of the first protrusion 29 is substantially equal to the outer diameter dimension of the second protrusion 63. In this embodiment, the first restricting portion 5 is the first protrusion 29. The first protrusion 29 is disposed in the first direction L1 of the first sealing member 11 and restricts the movement of the first sealing member 11 in the first direction L1.

[0020] The case 2 includes a top plate portion 26 that is located in the first direction L1 of the first side wall portion 23 and covers the impeller 8 from the first direction L1, a suction pipe 21 that protrudes in the first direction from the central portion of the top plate portion 26, and a discharge pipe 22 that extends in a direction orthogonal to the rotation axis L. The suction pipe 21 has a cylindrical shape centered on the rotation axis L. The suction pipe 21 is inserted into a flow path pipe 520 provided inside the attachment hole 510. A step portion 211 facing the first direction L1 is provided on the outer peripheral surface of the suction pipe 21. An annular second sealing member 12 is disposed on the step portion 211. The second sealing member 12 is an O-ring and is in an elastically deformed state 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 outflow pipe (not shown) provided inside the attachment hole 510.

[0021] As shown in Figure 1, a fixing portion 17 is provided between the connecting plate portion 24 and the first end face 65 to fix the case 2 and the housing 6. In this embodiment, the fixing portion 17 is a welded portion 171 formed by welding a projection 27 provided on the connecting plate portion 24 to the first end face 65. Here, a gap S is formed between the second side wall portion 25 and the outer circumferential surface of the body portion 61 of the housing 6.

[0022] The first sealing member 11 is an O-ring. The first sealing member 11 is positioned in contact with the outer circumferential surface of the case 2 and elastically deforms radially perpendicular to the axis of rotation L between the case 2 and the inner circumferential surface of the mounting hole 510. As shown in Figure 6, when the case 2 is not inserted into the mounting hole 510, when viewed from the second direction L2, the first sealing member 11 extends radially outward from the first protrusion 29 by a dimension less than half the radial width of the first sealing member 11 than the radial width of the first protrusion 29. In this embodiment, when the first sealing member 11 elastically deforms between the case 2 and the inner circumferential surface of the mounting hole 510, it comes into close contact with both the first protrusion 29 and the second protrusion 63.

[0023] The impeller 8 is made of resin. The impeller 8 is driven to rotate around the rotation axis L by the motor 10. When the impeller 8 rotates together with the rotor 4 around the rotation axis L by the drive of the motor 10, the fluid in the pump chamber 20 flows in the direction of rotation. As a result, the fluid generates centrifugal force, causing low pressure on the radially inner side and high pressure on the radially outer side, and is drawn in through the inlet of the suction pipe 21 and discharged through the outlet of the discharge pipe 22.

[0024] (Effects and Benefits) The pump device 100 in this embodiment includes a resin case 2 that covers the impeller 8 from a first direction L1 of the housing 6 and is inserted from a second direction L2 into a mounting hole 510 formed in the mounting member 500; an annular first sealing member 11 that is positioned in contact with the outer circumferential surface of the case 2 and elastically deforms radially perpendicular to the axis of rotation between the case 2 and the inner circumferential surface of the mounting hole 510; a first restricting part 5 positioned in the first direction L1 of the first sealing member 11 and restricting the movement of the first sealing member 11 in the first direction L1; and a second restricting part 9, which is provided separately from the first restricting part 5 and positioned in the second direction L2 of the first sealing member 11 and restricting the movement of the first sealing member 11 in the second direction L2. The first restricting part 5 is a first protrusion 29 that protrudes radially outward from the outer circumferential surface of the case 2. The second restricting part 9 is a second protrusion 63 that protrudes radially outward from the outer circumferential surface of the body 61 of the housing 6.

[0025] As a result, since the first protrusion 29 and the second protrusion 63 are provided separately, a resin case 2 equipped with the first protrusion 29 can be molded without forming a parting line on the outer circumferential surface of the body portion 61 that contacts the first sealing member 11. As a result, no steps are created on the outer circumferential surface of the body portion 61, improving the adhesion between the first sealing member 11 and the outer circumferential surface of the body portion 61, and suppressing fluid leakage from the mounting hole portion 510.

[0026] Case 2 comprises a first side wall portion 23 that surrounds the impeller 8 from the radial outside, an annular connecting plate portion 24 that protrudes radially outward from the end of the first side wall portion 23 in the second direction L2 and faces the first end face 65 of the housing 6 facing the first direction L1, and a second side wall portion 25 that protrudes in the second direction L2 from the outer peripheral edge of the connecting plate portion 24, surrounds the housing 6, and has a first sealing member 11 arranged on its outer peripheral surface. A fixing portion 17 is provided between the connecting plate portion 24 and the first end face 65 to fix the case 2 and the housing 6. 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 side wall portion 25 and the outer peripheral surface of the body portion 61 of the housing 6. As a result, the molten resin when forming the welded portion 171 remains in the gap S, so that the resin does not leak out to the outside of case 2.

[0027] Case 2 comprises a top plate portion 26 located in a first direction L1 on the first side wall portion 23 and covering the impeller 8 from the first direction L1, and an intake pipe 21 that protrudes from the central portion of the top plate portion 26 in the first direction L1 and is inserted into a flow channel pipe 520 provided inside the mounting hole portion 510. The second side wall portion 25 and the intake pipe 21 are formed so that their rotation axis L is coaxial. A second sealing member 12 is positioned at the tip of the intake pipe 21. This is positioned on the outer circumferential surface of the second side wall portion 25. Since the positions of the first sealing member 11 and the second sealing member 12, which is positioned on the outer surface of the suction pipe 21, can be appropriately controlled, a decrease in the airtightness between the first sealing member 11 and the second sealing member 12 can be suppressed.

[0028] The first sealing member 11 is an O-ring. The first sealing member 11 extends radially outward from the first protrusion 29 by a dimension less than half the radial width of the first sealing member 11 than the radial width of the first protrusion 29. This allows for appropriate control of the elastic deformation of the first sealing member 11.

[0029] (Other embodiments) Figure 7 illustrates the second projection 63A of another embodiment. As shown in Figure 7, in the other embodiment, the second projection 63 is radially wider outward than the first projection 29 when viewed from the second direction L2. As a result, when the case 2 is inserted into the mounting hole 510, the second projection 63 contacts the mounting surface 530 of the mounting member 500, allowing the pump device 100 to be positioned relative to the mounting member 500 in the first direction L1.

[0030] (modified version) In the above embodiment, the first restricting portion 5 was a first protrusion 29 that projected radially outward in an annular shape from the outer peripheral surface of the second side wall portion 25 of the case 2. However, the first restricting portion 5 is not limited to the first protrusion 29. The first restricting portion 5 may be provided in a location other than the case 2.

[0031] The second restricting portion 9 was a second protrusion 63 that projected in an annular shape from the outer circumferential surface of the housing 6, but the second restricting portion 9 is not limited to the second protrusion 63. The second restricting portion 9 may have any configuration as long as it is provided separately from the first restricting portion 5.

[0032] In the above embodiment, the fixing portion 17 was a welded portion 171 formed by welding the connecting plate portion 24 and the first end face 65 together, but the fixing portion 17 is not limited to a welded portion 171. For example, the fixing portion 17 may be a screw that fixes the connecting plate portion 24 and the first end face 65 together.

[0033] In the above embodiment, the second projection 63 is located in a first direction L1 from the center of the body 61 and near the end of the body 61 in the first direction L1. However, the second projection 63 is not limited to this position. The second projection 63 may be located near the center of the body 61, or it may be located in a second direction L2 from the center of the body 61.

[0034] Furthermore, this technology can be configured as follows:

[0035] (Note 1) A motor comprising a rotor, a stator surrounding the outer circumference of the rotor, and a resin housing covering the stator, If we define a first direction along the rotation axis of the rotor and a second direction opposite to the first direction, then an impeller is positioned in the first direction of the rotor and rotates integrally with the rotor, A resin case covers the impeller from the first direction of the housing and is inserted from the second direction into a mounting hole formed in the mounting member, An annular first sealing member is positioned in contact with the outer circumferential surface of the case and elastically deforms in a radial direction perpendicular to the axis of rotation between the case and the inner circumferential surface of the mounting hole, A first restricting portion is positioned in the first direction of the first sealing member and restricts the movement of the first sealing member in the first direction, A second restricting portion, which is provided separately from the first restricting portion, is positioned in the second direction of the first sealing member and restricts the movement of the first sealing member in the second direction. A pump device characterized by comprising the following features.

[0036] (Note 2) The first restricting portion is a first protrusion that protrudes radially outward from the outer circumferential surface of the case, The pump device according to Appendix 1, characterized in that the second restricting portion is a second protrusion that protrudes radially outward from the outer circumferential surface of the housing.

[0037] (Note 3) The case comprises a first side wall portion that surrounds the impeller from the radially outside, an annular connecting plate portion that protrudes radially outward from the end of the first side wall portion in the second direction and faces the first end face of the housing facing the first direction, and a second side wall portion that protrudes in the second direction from the outer peripheral edge of the connecting plate portion and surrounds the housing, with the first sealing member disposed on its outer peripheral surface. The pump device according to Appendix 2, characterized in that a fixing portion for fixing the case and the housing is provided between the connecting plate portion and the first end face.

[0038] (Note 4) The fixing portion is a welded portion formed by welding the connecting plate portion and the first end face, The pump device according to Appendix 3, characterized in that a gap is formed between the second side wall and the outer circumferential surface of the housing.

[0039] (Note 5) The case comprises a top plate portion located in the first direction of the first side wall portion and covering the impeller from the first direction, and an intake pipe protruding from the central portion of the top plate portion in the first direction and inserted into a flow path pipe provided inside the mounting hole portion, The second side wall and the suction pipe are formed such that their rotational axes are coaxial. The pump device according to Appendix 3 or 4, characterized in that a second sealing member is arranged at the tip of the suction pipe.

[0040] (Note 6) The first sealing member is an O-ring, The pump device according to any one of the appendices 2 to 5, characterized in that the first sealing member extends radially outward from the first protrusion by a dimension less than half the radial width of the first sealing member than the radial width of the first protrusion.

[0041] (Note 7) The pump device according to any one of the appendices 2 to 6, characterized in that the second projection is wider radially outward than the first projection. [Explanation of symbols]

[0042] 100...Pump device, 2...Case, 3...Stator, 3...Note, 4...Rotor, 5...First regulating section, 6...Housing, 8...Impeller, 9...Second regulating section, 10...Motor, 11...First sealing member, 12...Second sealing member, 13...Radial bearing, 15...Magnet, 16...Support shaft, 17...Fixed section, 18...Cover, 19...Circuit board, 20...Pump chamber, 21...Suction pipe, 22...Discharge pipe, 23...First side wall section, 24...Connecting plate section, 2 5...Second side wall section, 26...Top plate section, 27...Protrusion, 29...First projection section, 31...Stator core, 32...Insulator, 35...Coil, 40...Cylindrical section, 61...Body section, 62...Tube section, 63·63A...Second projection section, 64...Flange section, 65...First end face, 171...Welded section, 211...Step section, 221...Discharge port, 500...Mounting member, 510...Mounting hole section, 520...Flow tube, 530...Mounting surface, L...Rotation axis, S...Gap.

Claims

1. A motor comprising a rotor, a stator surrounding the outer circumference of the rotor, and a resin housing covering the stator, If we define a first direction along the rotation axis of the rotor and a second direction opposite to the first direction, then an impeller is positioned in the first direction of the rotor and rotates integrally with the rotor, A resin case covers the impeller from the first direction of the housing and is inserted from the second direction into a mounting hole formed in the mounting member, An annular first sealing member is positioned in contact with the outer circumferential surface of the case and elastically deforms in a radial direction perpendicular to the axis of rotation between the case and the inner circumferential surface of the mounting hole, A first restricting portion is positioned in the first direction of the first sealing member and restricts the movement of the first sealing member in the first direction, A second restricting portion, which is provided separately from the first restricting portion, is positioned in the second direction of the first sealing member and restricts the movement of the first sealing member in the second direction. A pump device characterized by comprising the following features.

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

3. The case comprises a first side wall portion that surrounds the impeller from the radially outward direction, an annular connecting plate portion that protrudes radially outward from the end of the first side wall portion in the second direction and faces the first end face of the housing facing the first direction, and a second side wall portion that protrudes in the second direction from the outer peripheral edge of the connecting plate portion and surrounds the housing, with the first sealing member disposed on its outer peripheral surface. The pump device according to claim 2, characterized in that a fixing portion for fixing the case and the housing is provided between the connecting plate portion and the first end face.

4. The fixing portion is a welded portion formed by welding the connecting plate portion and the first end face, The pump device according to claim 3, characterized in that a gap is formed between the second side wall and the outer circumferential surface of the housing.

5. The case comprises a top plate portion located in the first direction of the first side wall portion and covering the impeller from the first direction, and an intake pipe protruding from the central portion of the top plate portion in the first direction and inserted into a flow path pipe provided inside the mounting hole portion, The second side wall and the suction pipe are formed such that their rotational axes are coaxial. The pump device according to claim 3 or 4, characterized in that a second sealing member is arranged at the tip of the suction pipe.

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

7. The pump device according to claim 2, characterized in that the second protrusion is wider radially outward than the first protrusion.

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