Electric pump

Abstract

To provide an electric pump that is downsized in an axial direction while reducing a load on one side in the axial direction of a rotor, and whose manufacturing cost is reduced.SOLUTION: An electric pump comprises: a case; and a motor comprising a rotor and a stator, and surrounded by the case. The case includes an introduction pipe part for introducing fluid, and a discharge pipe part for discharging the fluid. The rotor is arranged in a space surrounded by the case and the stator, and communicating with the introduction pipe part and the discharge pipe part. The rotor includes a first impeller member, a second impeller member, and a relay part. The outside diameter of the relay part is smaller than the outside diameter of at least one of the first impeller and the second impeller. The relay part is located between the first impeller member and the second impeller member.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to an electric pump. [Background technology]

[0002] There is an electric pump that includes a blade member having blades on both the front and back surfaces to prevent an excessive load from being applied to one side in the axial direction of the rotor (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-153331 A Summary of the Invention [Problem to be solved by the invention]

[0004] Loads are applied to the blade member from both the front and back sides, which may cause the blade member to warp. To prevent such warping, it is possible to form the blade member thicker. However, if the blade member is too thick, the electric pump may become larger in the axial direction. Furthermore, if the blades are made of resin on both the front and back sides of the blade member, molding defects may occur. Furthermore, the mold for this purpose is complex. This may increase manufacturing costs.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide an electric pump that is axially compact while suppressing the load on one axial side of the rotor, and that also has reduced manufacturing costs. [Means for solving the problem]

[0006] The above object can be achieved by an electric pump comprising: a case; and a motor having a rotor and a stator and surrounded by the case, the case including an inlet pipe section for introducing a fluid and an outlet pipe section for discharging the fluid, the rotor being disposed in a space surrounded by the case and the stator and communicating with the inlet pipe section and the outlet pipe section, the rotor including a first blade member, a second blade member, and a relay section, the outer diameter of the relay section being smaller than the outer diameter of at least one of the first and second blade members, and the relay section being located between the first blade member and the second blade member. Effect of the Invention

[0007] It is possible to provide an electric pump that is compact in the axial direction while suppressing the load on one side of the rotor in the axial direction, and also has reduced manufacturing costs. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is an external perspective view of the electric pump. [Diagram 2] FIG. 2 is an exploded perspective view of the electric pump. [Diagram 3] FIG. 3 is an exploded perspective view of the electric pump. [Figure 4] FIG. 4 is a cross-sectional view of the electric pump. [Diagram 5] FIG. 5 is an external view of the holding portion. [Figure 6] FIG. 6 is an external view of the holding portion. [Figure 7] 7A and 7B are explanatory diagrams of modified examples of the blade members. [Figure 8] 8A and 8B are explanatory diagrams of modified examples of the blade members. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Outline of electric pump configuration] Fig. 1 is an external perspective view of the electric pump 1. Fig. 2 and Fig. 3 are exploded perspective views of the electric pump 1. The electric pump 1 includes a first case 10, a cover 20, a second case 30, a support member 40, and a rotor 50. The first case 10, the cover 20, the second case 30, and the support member 40 are fixed by a plurality of screws S in an overlapping state in the axial direction A of a motor M described later.

[0010] The first case 10 and the second case 30 are made of resin. The cover 20 and the support member 40 are made of metal. The cover 20 is made of, for example, an aluminum alloy. The support member 40 is made of, for example, stainless steel. The first case 10 and the second case 30 overlap in the axial direction A. The support member 40 is sandwiched between the second case 30 and the cover 20. The first case 10 and the second case 30 are examples of a first member and a second member, respectively.

[0011] Positioning bosses 28 and 29 are formed in the cover 20. Positioning holes 48 and 49 are formed in the support member 40. A positioning recess 38 is formed in the second case 30. The positioning boss 28 fits into the positioning hole 48 and the positioning recess 38, thereby defining the positions of the second case 30 and the support member 40 relative to the cover 20. The positioning boss 29 fits into the positioning hole 49, thereby defining the position of the support member 40 relative to the cover 20.

[0012] The first case 10 is formed with an inlet pipe section 11 and an outlet pipe section 12. The inlet pipe section 11 draws the fluid into the electric pump 1. The outlet pipe section 12 discharges the fluid from the electric pump 1. In this embodiment, the fluid is a liquid, but it may be a gas. A connector C2 attached to the tip of the cable C1 is inserted into an opening 27 of the cover 20. As a result, the connector C2 is electrically connected to the printed circuit board P, and power is supplied to a motor M described later.

[0013] FIG. 4 is a cross-sectional view of the electric pump 1. The motor M is surrounded by the first case 10, the second case 30, and the cover 20. The motor M includes a rotor 50, a stator 64, a coil 66, and a shaft member 82. The rotor 50 includes a holding portion 52, a magnet 62, and a plain bearing 70. The magnet 62 is held at a position radially outside the holding portion 52. The holding portion 52 is made of resin. The magnet 62 is cylindrical. The magnet 62 is magnetized with different polarities in the circumferential direction. The plain bearing 70 is held radially inside the holding portion 52. A blade member 54 is formed at one end of the holding portion 52. A blade member 57, which will be described in detail later, is formed at the other end of the holding portion 52. The stator 64 is disposed radially outside the magnet 62. A plurality of coils 66 are wound around the stator 64. The stator 64 is supported in a press-fitted state in the support member 40 .

[0014] The second case 30 is annular. A partition member 34 is attached to the inside of the second case 30. The partition member 34 is made of metal. The partition member 34 separates the rotor 50 and the stator 64. The fluid introduced from the inlet pipe 11 is introduced into a space defined by the partition member 34 and the first case 10. A rubber O-ring R is disposed between the inner surface of the second case 30 and between the partition member 34 and the first case 10.

[0015] The shaft member 82 is inserted into the plain bearing 70. A washer W1 is fitted to one end of the shaft member 82. The washer W1 is sandwiched between the first case 10 and the plain bearing 70. The other end of the shaft member 82 is fixed to a support plate 84 via a washer W2. In this manner, the shaft member 82 is fixed so as not to rotate. A rubber damper D is disposed between one end of the shaft member 82 and the first case 10. The support plate 84 is disposed at the bottom of the partition member 34.

[0016] When the coils 66 are energized, a magnetic force is generated between the stator 64 and the magnets 62. This causes the rotor 50 to rotate. In this manner, the blade members 54 rotate.

[0017] The rotor 50 is disposed in a space surrounded by the first case 10 and the partition member 34 and communicating with the inlet pipe section 11 and the outlet pipe section 12. As a result, when the rotor 50 rotates, the fluid introduced into this space from the inlet pipe section 11 is discharged from the outlet pipe section 12.

[0018] [Detailed configuration of holding portion 52] 5 and 6 are external views of the holding portion 52. In addition, the magnet 62 is omitted in FIG. 5 and FIG. 6. The holding portion 52 includes the blade member 54, the cylindrical portion 53, the reduced diameter portion 55, the flange portion 56, and the blade member 57. The blade member 54 is an example of a first blade member. The blade member 57 is an example of a second blade member. The cylindrical portion 53, the reduced diameter portion 55, and the flange portion 56 are located between the blade member 54 and the blade member 57. The outer diameters of the cylindrical portion 53 and the reduced diameter portion 55 are smaller than the outer diameters of the blade members 54 and 57. The outer diameter of the flange portion 56 is smaller than the blade member 54. Therefore, the cylindrical portion 53, the reduced diameter portion 55, and the flange portion 56 are an example of a relay portion. The cylindrical portion 53 is located radially inward from the magnet 62. The cylindrical portion 53 is cylindrical. The cylindrical portion 53 fits into the magnet 62. The reduced diameter portion 55 is located between the blade member 54 and the flange portion 56. The outer diameter of the reduced diameter portion 55 is smaller than the outer diameters of the blade member 54, the flange portion 56, the cylindrical portion 53, the magnet 62, and the blade member 57. The outer diameter of the flange portion 56 is larger than the outer diameters of the reduced diameter portion 55 and the cylindrical portion 53, and smaller than the outer diameter of the blade member 54. The outer diameter of the flange portion 56 is approximately the same as the outer diameter of the magnet 62.

[0019] The flange portion 56 and the blade member 57 sandwich the magnet 62 in the axial direction A. The blade member 54 is located on one side of the magnet 62, and the blade member 57 is located on the other side of the magnet 62. That is, the blade members 54 and 57 are separated from each other in the axial direction A. The blade member 54 is surrounded by the first case 10 as shown in FIG. 4. The blade member 57 is surrounded by the stator 64 and the partition member 34 as shown in FIG. 4. As shown in FIG. 6, the blade member 54 has uneven blades formed on the front side, but no blades are formed on the back side. Therefore, the shape of the blade member 54 is not complicated, and the holding portion 52 can be easily manufactured. Therefore, the manufacturing cost is suppressed.

[0020] The blade member 57 includes a flange portion 571 and a blade portion 572. The flange portion 571 and the blade portion 572 are both annular. The outer diameter of the flange portion 571 is larger than the outer diameter of the blade portion 572. The blade portion 572 is formed on the flange portion 571. In this embodiment, four grooves 573 are formed in the blade portion 572. The four grooves 573 are provided at equal angular intervals. That is, the four grooves 573 are provided at 90 degree intervals. The grooves 573 extend linearly in the radial direction. The grooves 573 extend from a midpoint in the radial direction of the blade portion 572 to the outer periphery of the blade portion 572. The width of the grooves 573 perpendicular to the direction in which the grooves 573 extend is constant in the radial direction. The depth of the grooves 573 is constant in the radial direction. The blade portion 572 is formed with two recesses 574 for positioning the magnet 62 when it is magnetized.

[0021] In this manner, the blade members 54 and 57 are integrally formed with the retaining portion 52. This prevents the load on one side of the rotor 50 in the axial direction A from becoming excessively large. Also, the thicknesses of the blade members 54 and 57 can be reduced. As a result, the electric pump 1 is made smaller in size in the axial direction A.

[0022] Furthermore, the radial size of the blade member 57 does not depend on the radial size of the blade member 54. This improves the freedom in designing the blade member 57. In this embodiment, the outer diameter of the blade member 57 is smaller than the outer diameter of the magnet 62. This makes it possible to prevent the force that the blade member 57 receives from the fluid from becoming excessive.

[0023] Moreover, the blade members 57 are not limited to being arranged so as to be surrounded by the partition member 34 as in this embodiment. The blade members 57 may be arranged anywhere within the space surrounded by the first case 10 and the partition member 34 as long as the location is where the fluid pressure is high.

[0024] [Modifications of the blade components] 7A to 8B are explanatory diagrams of modified examples of the blade member. The same components as those in the above-mentioned embodiment are denoted by the same reference numerals and description thereof will be omitted. As shown in FIG. 7A, eight grooves 573a are provided in blade portion 572a of blade member 57a of holding portion 52a. The eight grooves 573a are provided at equal angular intervals. In other words, the eight grooves 573a are provided at 45 degree intervals. The depth of grooves 573a increases radially outward.

[0025] As shown in Fig. 7B, eight grooves 573b are provided in blade portion 572b of blade member 57b of holder 52b. Groove 573b extends from the inner peripheral edge of blade portion 572b to the outer peripheral edge of blade portion 572b. The width of groove 573b is wider than the widths of grooves 573 and 573b described above. The depth of groove 573b is shallower than the depth of groove 573 described above.

[0026] 8A, eight grooves 573c are provided in blade portion 572c of blade member 57c of holding portion 52c. The depth of groove 573c is shallower than the depth of groove 573 described above.

[0027] 8B, eight grooves 573d are provided in blade portion 572d of blade member 57d of holder 52d. Groove 573d extends from the inner peripheral edge of blade portion 572d to the outer peripheral edge of blade portion 572d. The depth of groove 573d increases radially outward.

[0028] The contents of the above-described embodiment can also be applied to an electric pump that introduces and exhausts gas, that is, the electric pump includes a so-called electric blower that introduces and exhausts gas.

[0029] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0030] 1 Electric pump 10 Case 1 11 Inlet pipe section 12 Discharge pipe section 34 Partitioning material 50 rotors 52 Holding part 53 Cylindrical section (relay section) 54 Blade member (first blade member) 55 Reduced diameter section (relay section) 57 Blade member (second blade member) 571 Flange part 572 Wing 573 Groove 62 Magnet 64 Stator Medium motor

Claims

1. Case and a motor having a rotor and a stator and enclosed in the case; The case includes an inlet pipe portion for introducing a fluid and a discharge pipe portion for discharging the fluid, the rotor is disposed in a space surrounded by the case and the stator and communicating with the inlet pipe portion and the outlet pipe portion, The rotor includes a first blade member, a second blade member, and a relay portion, an outer diameter of the relay portion is smaller than an outer diameter of at least one of the first and second blade members; the relay portion is located between the first blade member and the second blade member, a blade portion is provided on a surface of the first blade member opposite to the relay portion, A blade portion is provided on a surface of the second blade member opposite to the relay portion, A partition member is provided to separate the rotor and the stator, the rotor is disposed in a space surrounded by the case and the partition member and communicating with the inlet pipe portion and the outlet pipe portion, The second blade member is surrounded by the partition member.

2. The electric pump of claim 1 , wherein the second blade member includes a plurality of grooves extending linearly in a radial direction.

3. 3. The electric pump according to claim 2, wherein a width of said groove perpendicular to a radial direction is constant.

4. The rotor includes a magnet.

4. The electric pump according to claim 2, wherein an outer diameter of the second blade member is smaller than an outer diameter of the magnet.

5. The first blade member is surrounded by the case, 4. The electric pump of claim 1, wherein the second blade member is surrounded by the stator.

6. The rotor includes a magnet, the first blade member is located on one side of the magnet, 4. The electric pump according to claim 1, wherein the second blade member is located on the other side of the magnet.

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