Pump device

Abstract

A pump device 1 has a housing 8 that is provided with: a vibration-proof member 30 formed of an elastic body; and an attachment part 10 fixed to a pump attachment surface M by means of a spacer 40 mounted to the vibration-proof member 30. The vibration-proof member 30 is provided with a first end face 33 which faces the pump attachment surface M and a second end face 34 which is oriented toward the opposite side to the first end face 33, has provided therein a through-hole 31 extending from the first end face 33 to the second end face 34, and has provided in the outer circumference thereof an attachment groove 32 extending in the circumferential direction. The spacer 40 is provided with: a cylindrical part 41 that is fitted inside the through-hole 31; and a flange part 42 that overlaps either the first end face 33 or the second end face 34. The attachment part 10 includes a plate-like fitting section 14 that is fitted in the attachment groove 32. On the surface of the fitting section 14, a pedestal part 15 is formed integrally with the fitting section 14 in order to increase the thickness of the fitting section 14.

Description

Pump equipment

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

[0002] Patent Document 1 describes a pump device in which an impeller disposed in a pump chamber is rotated by a motor. The pump device has two mounting portions protruding from the outer circumferential surface of a resin housing that covers a stator. A vibration-isolating rubber bushing, designated by reference numeral 600 in FIG. 1B of Patent Document 1, is attached to each mounting portion. A spacer, designated by reference numeral 500 in FIG. 1B, is attached to the rubber bushing. The spacer has a flange portion that overlaps the end face of the rubber bushing and a cylindrical portion that fits into the through-hole of the rubber bushing. When fixing the pump device to a mounting surface, the tip of a bolt that has passed through the cylindrical portion of the spacer is fixed to a threaded hole in the mounting surface. The rubber bushing is compressed between the flange portion of the spacer and the mounting surface.

[0003] Patent Document 2 describes a vibration-damping grommet as a vibration-damping member used in the same location as the rubber bushing of Patent Document 1. The vibration-damping grommet of Patent Document 2 has a mounting groove extending circumferentially on the outer peripheral surface of a cylindrical elastic body. The vibration-damping grommet is fitted with a spacer (collar) that includes a flange that overlaps the end face of the elastic body and a tubular portion (pipe) that extends from the center of the flange and fits into a through-hole in the elastic body. A washer is placed on the elastic body from the opposite side of the flange, and a bolt is passed through the spacer's pipe and fixed to a threaded hole on the mounting surface. The bolt is then tightened until the tip of the pipe abuts the inner peripheral portion of the washer. Therefore, the compression amount of the vibration-damping grommet is determined by the length of the spacer's pipe.

[0004] Chinese Utility Model No. 209233673 Patent Publication No. 2020-34120

[0005] When a pump device is fixed via a vibration-isolating member such as a rubber bushing, as in Patent Document 1, vibration of the pump device increases if the resonant frequency of the vibration-isolating member matches the frequency component of the pump device's rotational speed. The resonant frequency of the vibration-isolating member changes depending on the amount of compression of the vibration-isolating member. Therefore, when designing a pump device, the amount of compression of the vibration-isolating member is determined so that the rotational speed component and the resonant frequency do not match.

[0006] When changing the design of an existing pump device, changing the rated rotational speed can sometimes cause the rotational speed component to coincide with the resonance frequency. In such cases, changing the compression amount of the vibration-isolating material to shift the resonance frequency requires the use of a vibration-isolating material with a new shape, which cannot be achieved with existing parts. Furthermore, when using a vibration-isolating material with a new shape, the spacer that is attached to the through-hole of the vibration-isolating material and determines the compression amount must also be changed to a new shape. Therefore, the burden of changing parts is significant.

[0007] In view of the above problems, an object of the present invention is to make it possible to change the resonance frequency without changing the vibration-isolating member.

[0008] In order to solve the above problems, the present invention provides a pump device comprising: a motor including a rotor, a stator surrounding an outer periphery of the rotor, and a housing sealing the stator; a case fixed to the housing to form a pump chamber between the case and the housing; and an impeller disposed in the pump chamber and rotating integrally with the rotor, the housing including a vibration-isolating member made of an elastic body and a mounting portion fixed to a pump mounting surface via a spacer attached to the vibration-isolating member, the vibration-isolating member having a first end surface facing the pump mounting surface, and a second end surface facing the first end surface. The spacer has a second end face facing the opposite direction, a through hole extending from the first end face to the second end face, and a mounting groove extending circumferentially on its outer peripheral surface, the spacer has a tubular portion that fits inside the through hole and a flange portion that overlaps either the first end face or the second end face, the mounting portion has a plate-shaped fitting portion that fits into the mounting groove, and a base portion for increasing the thickness of the fitting portion is formed integrally with the fitting portion on the surface of the fitting portion, or a washer is arranged between the fitting portion and the inner surface of the mounting groove.

[0009] FIG. 1 is a cross-sectional view of a pump device to which the present invention is applied, taken along a plane including the rotation axis. FIG. 2 is a partial side view of the pump device. FIG. 3 is a plan view of a portion where a mounting portion is fixed to a pump mounting surface via a vibration-isolating member and a spacer. FIG. 4 is a perspective view of a portion where the vibration-isolating member and spacer are attached to the mounting portion. FIG. 5 is a perspective view of the mounting portion as seen from the side where the base portion is formed. FIG. 6 is a perspective view of the mounting portion as seen from the opposite side from the base portion. FIG. 7 is a perspective view of the vibration-isolating member and spacer. FIG. 8 is a cross-sectional view (taken at position A-A in FIG. 3) of a portion where a mounting portion is fixed to a pump mounting surface via a vibration-isolating member and a spacer. FIG. 9 is an explanatory diagram of an embodiment in which a washer is attached instead of a base portion.

[0010] Hereinafter, an embodiment of the pump device 1 will be described with reference to the drawings. In the following description, the direction along the rotation axis L of the motor 2 is referred to as the axial direction, one side of the axial direction is referred to as L1, and the other side of the axial direction is referred to as L2.

[0011] (Pump Device) Figure 1 is a cross-sectional view of the pump device 1. The pump device 1 includes a motor 2, an impeller 3 that is driven to rotate about a rotation axis L by the motor 2, and a case 4 that covers the motor 2 from one axial side L1. The motor 2 includes a rotor 5, a stator 7 that surrounds the outer periphery of the rotor 5, a housing 8 that covers the stator 7, and a cover 9 that is fixed to the housing 8 from the other axial side L2. The housing 8 is a resin-sealed member that is integrated with the stator 7 by insert molding.

[0012] The impeller 3 is disposed in a pump chamber 20 defined by the housing 8 and the case 4. The impeller 3 and the rotor 5 rotate together about the rotation axis L. The stator 7 includes a coil 6 wound around a stator core 70 via an insulator 71. A circuit board 19 that supplies power to the coil 6 is disposed between the bottom of the housing 8 and the cover 9. Metallic winding terminals 72 that penetrate the bottom of the housing 8 from the stator 7 and protrude to the other side L2 in the axial direction are soldered to the circuit board 19.

[0013] The case 4 includes a suction pipe 21 extending to one side L1 in the axial direction and a discharge pipe 22 extending in a direction perpendicular to the axial direction. The suction pipe 21 is connected to the radial center of the pump chamber 20, and the discharge pipe 22 is connected to the outer periphery of the pump chamber 20. The housing 8 is provided with a connector portion 80 that holds a plurality of connector terminals for external connection. Connector terminals (not shown) held by the connector portion 80 are soldered to the circuit board 19.

[0014] (Vibration-isolating member) Fig. 2 is a partial side view of the pump device 1. As shown in Fig. 2, the pump device 1 has mounting portions 10 formed on the housing 8. As shown in Figs. 1 and 2, the housing 8 has a body portion 81 that covers the outer periphery of the stator 7. The mounting portions 10 protrude from the body portion 81 of the housing 8 toward the outer periphery. The mounting portions 10 are provided at a plurality of different locations in the circumferential direction.

[0015] Figure 3 is a plan view of the location where the mounting portion 10 is fixed to the pump mounting surface M via the vibration-isolating member 30 and the spacer 40. Figure 4 is a perspective view of the location where the vibration-isolating member 30 and the spacer 40 are attached to the mounting portion 10. As shown in Figures 2, 3, and 4, the vibration-isolating member 30 is attached to the mounting portion 10. The spacer 40 is attached to the vibration-isolating member 30. As shown in Figure 3, when installing the pump device 1, the location where the vibration-isolating member 30 and the spacer 40 are attached to the mounting portion 10 is fixed to the pump mounting surface M with bolts 50. In this way, the pump device 1 is fixed to the pump mounting surface M via the vibration-isolating member 30.

[0016] FIG. 5 is a perspective view of the mounting portion 10 as viewed from the side where the base portion 15 is formed. FIG. 6 is a perspective view of the mounting portion 10 as viewed from the opposite side from the base portion 15. As shown in FIGS. 5 and 6 , the mounting portion 10 includes a mounting plate 11 parallel to the axial direction and a pair of reinforcing plates 12 extending perpendicular to the axial direction from an end of the mounting plate 11 on one axial side L1 and an end of the mounting plate 11 on the other axial side L2, respectively, and connected to the body portion 81. As shown in FIG. 3 , the mounting plate 11 includes a first surface S1 facing the pump mounting surface M and a second surface S2 facing the opposite side from the first surface S1. As shown in FIG. 6 , the pair of reinforcing plates 12 are connected to the second surface S2 of the mounting plate 11.

[0017] 5 and 6, the mounting portion 10 is formed with a notch 13 for mounting the vibration-damping member 30. The notch 13 includes a circular portion 131 formed by cutting a circle out of the mounting plate 11, and an opening 132 extending from the circular portion 131 to the tip of the mounting plate 11. The arc-shaped edge surrounding the circular portion 131 forms a fitting portion 14 that fits into a mounting groove 32 of the vibration-damping member 30, which will be described later, when the vibration-damping member 30 is mounted.

[0018] As shown in Fig. 5, the mounting portion 10 is formed with a pedestal portion 15 that extends circumferentially at a constant width along the edge of the circular portion 131. The pedestal portion 15 protrudes at a constant height from the first surface S1 of the mounting plate 11. Therefore, where the pedestal portion 15 is provided, the thickness of the mounting plate 11 is increased by the protruding height of the pedestal portion 15. As shown in Fig. 4, the outer diameter of the pedestal portion 15 is larger than the outer diameter of the vibration-damping member 30 attached to the cutout portion 13. Therefore, the pedestal portion 15 is formed over a wider area than the fitting portion 14, which is the portion that is positioned inside the attachment groove 32 when the vibration-damping member 30 is attached.

[0019] FIG. 7 is a perspective view of the vibration-damping member 30 and the spacer 40. As shown in FIG. 7, the vibration-damping member 30 is made of an elastic body with a through hole 31 formed in its center. For example, the vibration-damping member 30 is a rubber bushing. The outer peripheral surface of the vibration-damping member 30 is provided with a mounting groove 32 extending in the circumferential direction. The vibration-damping member 30 has an annular first end face 33 perpendicular to the central axis LA of the through hole 31, and an annular second end face 34 facing the opposite side from the first end face 33. Recesses 35 are formed on the outer peripheral edges of the first end face 33 and the second end face 34 and are arranged at a constant pitch in the circumferential direction. Note that the recesses 35 do not necessarily have to be formed.

[0020] As shown in Figure 7, the vibration-damping member 30 has large-diameter portions 36 at both ends along the central axis LA of the through-hole 31, and a small-diameter portion 37 in the central portion where the mounting groove 32 is provided. When mounting the vibration-damping member 30 to the mounting part 10, as shown in Figure 4, the small-diameter portion 37 of the vibration-damping member 30 is inserted from the opening 132 of the cutout portion 13 of the mounting plate 11 to the circular portion 131. This causes the fitting portion 14, which is the edge portion of the cutout portion 13, to fit into the mounting groove 32 of the vibration-damping member 30.

[0021] 7, the spacer 40 includes a cylindrical portion 41 and an annular flange portion 42 provided at one end in the direction along the central axis LA of the cylindrical portion 41. As shown in Figures 2, 3, and 4, the spacer 40 is assembled in such a manner that the cylindrical portion 41 is inserted into the through hole 31 of the vibration-damping member 30 and the flange portion 42 overlaps the first end surface 33 of the vibration-damping member 30.

[0022] Figure 8 is a cross-sectional view of the location where the mounting portion 10 is fixed to the pump mounting surface M via the vibration-damping member 30 and the spacer 40, taken along the line A-A in Figure 3. As shown in Figures 3 and 8, when fixing to the pump mounting surface M, the tip of the bolt 50 inserted into the cylindrical portion 41 of the spacer 40 is screwed into the pump mounting surface M. At this time, the head of the bolt 50 is brought into contact with the flange portion 42, and the bolt is screwed until the tip of the cylindrical portion 41 contacts the pump mounting surface M.

[0023] As shown in Figure 8, the axial length LB of the vibration-damping member 30 before attachment to the pump mounting surface M is longer than the axial length LS of the tubular portion 41. Therefore, the vibration-damping member 30 is compressed between the flange portion 42 and the pump mounting surface M. The compression amount P0 of the vibration-damping member 30 at this time increases by the amount of increase in the thickness of the fitting portion 14 due to the provision of the base portion 15 on the fitting portion 14 that fits into the mounting groove 32 of the vibration-damping member 30. The increased compression amount coincides with the protruding height P1 of the base portion 15. The resonant frequency of the pump device 1 changes in accordance with the increased compression amount.

[0024] (Operation and Effect) As described above, the pump device 1 of this embodiment comprises the motor 2 including the rotor 5, the stator 7 surrounding the outer periphery of the rotor 5, and the housing 8 sealing the stator 7, a case fixed to the housing 8 to form the pump chamber 20 between the housing 8 and the impeller 3, and the impeller 3 disposed in the pump chamber 20 and rotating integrally with the rotor 5. The housing 8 includes the vibration-damping member 30 made of an elastic body and the mounting portion 10 fixed to the pump mounting surface M via the spacer 40 attached to the vibration-damping member 30. The vibration-damping member 30 has a first end face 33 facing the pump mounting surface M and a second end face 34 facing the opposite side from the first end face 33, and is provided with a through hole 31 extending from the first end face 33 to the second end face 34, and a mounting groove 32 extending circumferentially on the outer circumferential surface. The spacer 40 includes a cylindrical portion 41 that fits inside the through-hole 31, and a flange portion 42 that overlaps either the first end face 33 or the second end face 34. The mounting portion 10 includes a plate-shaped fitting portion 14 that fits into the mounting groove 32. A pedestal portion 15 for increasing the thickness of the fitting portion 14 is formed integrally with the fitting portion 14 on the surface thereof.

[0025] In this embodiment, a pedestal 15 is provided on the fitting portion 14 that fits into the mounting groove 32 of the vibration-damping member 30, and the compression amount of the vibration-damping member 30 is increased by an amount corresponding to the protruding height P1 of the pedestal 15. By providing the mounting portion 10 with a shape for adjusting the compression amount in this way, when the rotational speed component of the pump device 1 changes due to a change in the rated rotational speed of the pump device 1, it is possible to avoid a situation in which the resonance frequency and the rotational speed component coincide by shifting the resonance frequency without changing the shapes of the vibration-damping member 30 and the spacer 40. To provide the pedestal 15, when manufacturing the mounting portion 10, it is only necessary to change the mold material for the surface on which the pedestal 15 is provided, making it easy to accommodate changes in the compression amount.

[0026] In this embodiment, the base 15 is formed on one surface of the fitting portion 14 over at least the entire area of ​​the portion that is disposed inside the mounting groove 32. In this way, the inner surface of the mounting groove 32 does not come into contact with a step that may occur at the edge of the base 15. This makes it possible to keep the compression amount of the vibration-damping member 30 constant. In addition, it is possible to suppress deterioration of the vibration-damping member 30 that originates from the point where it comes into contact with the step.

[0027] In this embodiment, the outer diameter of the base 15 is larger than the outer diameter of the vibration-isolating member 30, and the base 15 protrudes outside the vibration-isolating member 30. This prevents the inner surface of the mounting groove 32 from coming into contact with the step formed on the edge of the base 15, as described above. The outer diameter of the base 15 only needs to be equal to or larger than the outer diameter of the vibration-isolating member 30.

[0028] In this embodiment, the protruding height of the base portion 15 is constant. Therefore, since there are no irregularities on the surface of the base portion 15, the amount of compression of the vibration-damping member 30 can be made constant. Furthermore, deterioration of the vibration-damping member 30 originating from the point of contact with the irregularities can be suppressed.

[0029] In this embodiment, the mounting portion 10 has a first surface S1 facing the pump mounting surface M, and the base portion 15 is provided on the first surface S1. In this way, the base portion 15 can be provided in a location on the mounting portion 10 that does not have any protruding parts around it. This makes it possible to avoid a complicated mold structure for molding the base portion 15 on the surface of the mounting portion 10.

[0030] In this embodiment, the housing 8 includes a body portion 81 that surrounds the outer periphery of the stator 7. The mounting portion 10 includes a plate-shaped mounting plate 11 that protrudes from the body portion 81, and a reinforcing plate 12 that connects the mounting plate 11 to the body portion 81. The fitting portion 14 is an edge portion that surrounds a notch portion 13, which is formed by cutting an end of the mounting plate 11 into a shape that corresponds to the mounting groove 32. The first surface S1 is the surface of the mounting plate 11 opposite the surface to which the reinforcing plate 12 is connected. In this manner, even if the reinforcing plate 12 is provided on the mounting portion 10, the base portion 15 can be provided in a location that is not surrounded by the reinforcing plate 12. This avoids the need for a complex mold structure for molding the base portion 15 on the surface of the mounting portion 10.

[0031] (Modification) The base portion 15 may be provided on the second surface S2 of the mounting plate 11 instead of the first surface S1. In this case as well, the compression amount of the vibration-proof member 30 can be increased.

[0032] (Another embodiment) Fig. 9 is an explanatory diagram of an embodiment in which a washer 60 is attached instead of providing a pedestal portion 15. In the embodiment shown in Fig. 9, the pedestal portion 15 is not provided on the surface of the fitting portion 14. Instead, a washer 60 is disposed on the surface of the fitting portion 14, interposed between the surface of the fitting portion 14 and the inner surface of the mounting groove 32. The plate thickness P2 of the washer 60 is the same as the protruding height P1 of the pedestal portion 15. The outer diameter of the washer 60 is larger than the outer diameter of the vibration-damping member 30.

[0033] 9, by interposing a washer 60 between the surface of the fitting portion 14 and the inner surface of the mounting groove 32, the compression amount of the vibration-damping member 30 is increased by an amount corresponding to the thickness P2 of the washer 60. Therefore, as in the above embodiment, if the rotational speed component of the pump device 1 changes due to a change in the rated rotational speed of the pump device 1, it is possible to shift the resonant frequency and prevent the resonant frequency from matching the rotational speed component without changing the shapes of the vibration-damping member 30 and the spacer 40.

[0034] The outer diameter of the washer 60 may be equal to or greater than the outer diameter of the vibration-isolating member 30. The washer 60 may also be disposed on the second surface S2 of the mounting plate 11 instead of the first surface S1.

[0035] (Summary) The summary of the present disclosure is as follows: (1) A motor including a rotor, a stator surrounding the outer periphery of the rotor, and a housing sealing the stator, a case fixed to the housing and forming a pump chamber between the housing and the case, and an impeller disposed in the pump chamber and rotating integrally with the rotor, the housing including a vibration-damping member made of an elastic body and a mounting portion fixed to a pump mounting surface via a spacer attached to the vibration-damping member, the vibration-damping member including a first end face facing the pump mounting surface and a second end face facing the opposite side to the first end face, a through hole extending from the first end face to the second end face, and a mounting groove extending circumferentially on the outer periphery, the spacer including a cylindrical portion fitted inside the through hole and a flange portion overlapping either the first end face or the second end face, the mounting portion including a plate-shaped fitting portion fitted into the mounting groove, A pump device characterized in that a base portion for increasing the thickness of the fitting portion is formed integrally with the fitting portion on the surface of the fitting portion, or a washer is disposed between the fitting portion and the inner surface of the mounting groove.

[0036] (2) The pump device according to (1) above, wherein the seat portion is formed on one surface of the fitting portion over at least the entire area of ​​the portion disposed inside the mounting groove.

[0037] (3) The pump device according to (1) or (2) above, wherein the base portion protrudes from the surface of the fitting portion by a constant height.

[0038] (4) The pump device according to any one of (1) to (3) above, wherein the mounting portion has a first surface facing the pump mounting surface, and the base portion is provided on the first surface.

[0039] (5) The pump device described in (4) above, wherein the housing includes a body portion surrounding the outer periphery of the stator, the mounting portion includes a plate-shaped mounting plate protruding from the body portion and a reinforcing plate connecting the mounting plate and the body portion, the fitting portion is an edge portion surrounding a notch portion formed by cutting an end of the mounting plate into a shape corresponding to the mounting groove, and the first surface is a surface of the mounting plate opposite to a surface to which the reinforcing plate is connected.

[0040] (6) The pump device according to (1) above, wherein the washer is disposed on the surface of the fitting portion, and the outer diameter of the washer is equal to or greater than the outer diameter of the vibration-proof member.

[0041] 1... pump device, 2... motor, 3... impeller, 4... case, 5... rotor, 6... coil, 7... stator, 8... housing, 9... cover, 10... mounting portion, 11... mounting plate, 12... reinforcing plate, 13... notch portion, 14... fitting portion, 15... base portion, 19... circuit board, 20... pump chamber, 21... suction pipe, 22... discharge pipe, 30... vibration-proof member, 31... through hole, 32... mounting groove, 33... first end surface, 3 4...second end surface, 35...recess, 36...large diameter portion, 37...small diameter portion, 40...spacer, 41...cylindrical portion, 42...flange portion, 50...bolt, 60...washer, 70...stator core, 71...insulator, 72...winding terminal, 80...connector portion, 81...body portion, 131...circular portion, 132...opening, L...rotation axis, LA...central axis, M...pump mounting surface, S1...first surface, S2...second surface

Claims

1. A motor comprising a rotor, a stator surrounding the outer periphery of the rotor, and a housing sealing the stator; a case fixed to the housing and forming a pump chamber between the housing and the case; and an impeller disposed in the pump chamber and rotating integrally with the rotor, wherein the housing comprises a vibration-damping member made of an elastic body, and a mounting portion fixed to a pump mounting surface via a spacer attached to the vibration-damping member, the vibration-damping member having a first end face facing the pump mounting surface and a second end face facing the opposite side to the first end face, a through hole extending from the first end face to the second end face, and a mounting groove extending circumferentially on the outer periphery, the spacer having a cylindrical portion fitted inside the through hole and a flange portion overlapping either the first end face or the second end face, and the mounting portion having a plate-shaped fitting portion fitted into the mounting groove, A pump device characterized in that a base portion for increasing the thickness of the fitting portion is formed integrally with the fitting portion on the surface of the fitting portion, or a washer is disposed between the fitting portion and the inner surface of the mounting groove.

2. The pump device according to claim 1, wherein the seat portion is formed on one surface of the fitting portion over at least the entire area of ​​the portion that is disposed inside the mounting groove.

3. The pump device according to claim 2, wherein the base portion protrudes a constant height from the surface of the fitting portion.

4. The pump device according to claim 1, wherein the mounting portion has a first surface facing the pump mounting surface, and the base portion is provided on the first surface.

5. The pump device described in claim 4, characterized in that the housing comprises a body portion surrounding the outer periphery of the stator, the mounting portion comprises a plate-shaped mounting plate protruding from the body portion and a reinforcing plate connecting the mounting plate and the body portion, the fitting portion is an edge portion surrounding a notch portion formed by cutting out an end of the mounting plate in a shape corresponding to the mounting groove, and the first surface is the surface of the mounting plate opposite to the surface to which the reinforcing plate is connected.

6. The pump device according to claim 1, wherein the washer is disposed on the surface of the fitting portion, and the outer diameter of the washer is equal to or greater than the outer diameter of the vibration-proof member.

Images