CN214533711U - Pump device - Google Patents

Abstract

A pump device is helpful for improving the heat dissipation effect of a heating element on a circuit board. The utility model discloses a pump device includes the shell accomodate rotor, stator, ratio in the shell the rotor with the stator leans on axial first side and the thick board direction and the axial unanimous circuit board and with set up in the part for the heat dissipation of the heating element contact of circuit board, the axial first side of shell comprises the section of thick bamboo portion of resin and along the axial with this section of thick bamboo portion butt and the open-ended cover portion of the axial first side of sealing this section of thick bamboo portion, wherein, the cover portion includes metal system part and resin system part, metal system part with heating element from axial both sides with the part butt for the heat dissipation, resin system part with section of thick bamboo portion welding, thereby will metal system part with section of thick bamboo portion is connected.

Description

Pump device

Technical Field

The utility model relates to a pump device.

Background

Conventionally, there is a pump device including a housing in which a stator, a rotor, and a circuit board that is closer to a first side in an axial direction than the stator and the rotor and has a plate thickness direction that coincides with the axial direction are housed, the first side in the axial direction of the housing being configured by a cylindrical portion made of resin and a cover portion that abuts against the cylindrical portion in the axial direction to close an opening in the first side in the axial direction of the cylindrical portion and is fixed to the cylindrical portion by a screw.

In the above-described pump device, a large-power heating element (for example, a power element such as a field effect transistor) is often present on the circuit board, and therefore, it is necessary to take a cooling measure to cool the heating element so as not to affect the operational stability and safety of the pump device due to an excessive temperature rise of the heating element.

As the cooling measure, conventionally, the cover portion is mainly formed of an aluminum casting, and a heat radiating member having elasticity is interposed between the cover portion and a heat generating element provided on the circuit board in the axial direction.

However, in the above case, since it is not easy to precisely control the amount of screw tightening for fixing the cover portion and the cylindrical portion, and variations are likely to occur, it has been conventionally necessary to set the heat radiating member thick to absorb positional variations of the cover portion with respect to the cylindrical portion due to variations in the amount of screw tightening, which has caused a problem that the heat radiating effect of the heat generating element on the circuit board is poor. On the other hand, in the above case, in order to seal between the cover portion and the cylinder portion, it is often necessary to provide a seal such as an O-ring between the cover portion and the cylinder portion, which tends to complicate the assembly work and increase the cost.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pump device which can improve the heat dissipation effect of a heating element on a circuit board.

In order to achieve the above object, the present invention provides a pump device, including a housing, a rotor, a stator, a circuit board, a heat radiating member, and a heat radiating member, the rotor and the stator being located on a first side in an axial direction, the plate thickness direction of the circuit board being identical to the axial direction, the heat radiating member being located on the circuit board, the first side in the axial direction of the housing being formed of a cylindrical portion made of resin, and a cover portion axially abutting against the cylindrical portion and closing an opening of the first side in the axial direction of the cylindrical portion, wherein the cover portion includes a metal portion and a resin portion, the metal portion abutting against the heat radiating member from both sides in the axial direction of the heat radiating member, the resin portion being welded to the cylindrical portion, and the metal portion being connected to the cylindrical portion.

Here, the "axial direction" refers to an extending direction of the rotation axis of the rotor.

According to the pump device of the present invention, the cover portion includes the metal portion and the resin portion, the metal portion abuts against the heat radiating member on both sides of the heating element provided on the circuit board in the axial direction, and the resin portion is welded to the cylindrical portion, thereby connecting the metal portion to the cylindrical portion, so that the heat radiating member is formed thick without considering the dimensional deviation of the cover portion, that is, the thin heat radiating member can be disposed between the metal portion and the heating element by adjusting the welding amount of the welded portion, and thereby the heat radiating effect of the heating element on the circuit board can be improved; further, by welding the resin portion to the cylindrical portion, it is not necessary to add an O-ring or the like between the cover portion and the cylindrical portion in order to seal therebetween, so that the assembling work is simplified, the production efficiency is improved, and the production cost is reduced.

In the pump device according to the present invention, it is preferable that the metal part and the resin part are formed integrally by insert molding.

According to the pump device of the present invention, the metal part and the resin part are integrated by insert molding, and therefore, the assembling work can be further simplified.

In the pump device according to the present invention, it is preferable that at least a part of the metal part on the side opposite to the heat generating element in the axial direction is exposed from the resin part to form an exposed part.

According to the present invention, the metal portion is exposed from the resin portion to form the exposed portion, so that the metal portion can be brought into contact with the outside air, thereby further improving the heat radiation effect.

In the pump device of the present invention, it is preferable that a step portion formed of a protrusion or a depression is formed in the exposed portion.

According to the pump device of the present invention, the step portion formed by the protrusion or the depression is formed on the exposed portion, so that the heat radiation area can be increased, and the heat radiation effect can be further improved; further, in the case where the metal part and the resin part are integrally formed by insert molding, the metal part can be easily positioned in the mold by the step part at the time of insert molding, and the positional accuracy of the metal part can be improved.

In the pump device of the present invention, it is preferable that the heat radiating member is an elastic piece, and the stepped portion abuts against the heat radiating member.

In the pump device according to the present invention, it is preferable that the metal part has a plate shape, and only an outer peripheral edge of the metal part is covered with the resin part.

According to the utility model discloses a pump device, metal part is platelike, and metal part's only outer peripheral edges are covered by resin part, consequently, can further improve the radiating effect.

In the pump device of the present invention, it is preferable that a notch portion and/or a protrusion portion be formed on an outer peripheral edge of the metal portion.

According to the present invention, since the notch portion and/or the protrusion portion is formed on the outer peripheral edge of the metal portion, it is possible to prevent the metal portion from rotating with respect to the resin portion, thereby ensuring the operational stability of the pump device.

In the pump device according to the present invention, it is preferable that the metal part has a plate shape, and an outer peripheral edge of the metal part is bent toward a first side in the axial direction or a second side opposite to the first side.

According to the present invention, since the metal part is plate-shaped and the outer periphery of the metal part is bent toward the first side in the axial direction or the second side opposite to the first side, when the thermal shock test is performed on the pump device (that is, when the pump device is placed in an environment in which the temperature repeatedly changes from top to bottom), the outer periphery of the metal part can suppress the resin part from radially expanding and contracting, and therefore, the occurrence of a gap due to the repeated expansion and contraction of the resin at the overlapping portion between the metal part and the resin part can be suppressed, and the reliability of the waterproof performance can be ensured.

In the pump device of the present invention, it is preferable that the material of the cylindrical portion is the same as the material of the resin portion.

According to the utility model discloses a pump device, the material of section of thick bamboo portion is the same with the material of resin system part, consequently, can improve welded reliability to ensure waterproof performance.

In the pump device according to the present invention, it is preferable that an outer peripheral edge of the resin portion is welded in abutment with an axial end surface of the cylindrical portion in the entire circumferential direction.

According to the present invention, the outer peripheral edge of the resin portion is welded to the axial end face of the cylindrical portion in the entire circumferential direction, and therefore, the sealing performance between the cover portion and the cylindrical portion can be reliably improved, thereby ensuring the waterproof performance.

In the pump device according to the present invention, it is preferable that the casing accommodates an impeller which is rotated by the rotor and is located on a second side opposite to the first side with respect to the rotor and the stator.

(effects of utility model)

According to the present invention, the cover portion includes the metal portion and the resin portion, the metal portion abuts against the heat radiating member with both sides of the heating element provided on the circuit board in the axial direction, and the resin portion is welded to the cylindrical portion, thereby connecting the metal portion to the cylindrical portion, so that the heat radiating member is formed thick without considering the dimensional deviation of the cover portion, that is, the thin heat radiating member can be arranged between the metal portion and the heating element by adjusting the welding amount of the welded portion, whereby the heat radiating effect of the heating element on the circuit board can be improved; further, by welding the resin portion to the cylindrical portion, it is not necessary to add an O-ring or the like between the cover portion and the cylindrical portion in order to seal therebetween, so that the assembling work is simplified, the production efficiency is improved, and the production cost is reduced.

Drawings

Fig. 1 is a side view schematically showing a pump device according to an embodiment of the present invention, in which a cover portion is not shown.

Fig. 2 is a partial side sectional view schematically showing a pump device according to an embodiment of the present invention.

Fig. 3 is a bottom view schematically showing a pump device according to an embodiment of the present invention, and the cover portion is not shown.

Fig. 4 schematically shows a bottom view of a metal portion of a cover portion in a pump device according to a modification of the present invention.

Fig. 5 is a partial side sectional view schematically showing a cover portion of a pump device according to a modification of the present invention.

(symbol description)

1 Pump device

10 impeller part

11 impeller portion casing

111 impeller part casing body part

112 has a fluid suction pipe

113 fluid discharge pipe

20 motor part

211 rotor

2111 shaft part

2112 bearing

2113 cylindrical body

2114 magnet

212 stator

22 barrel part

23 Circuit Board

24 heating element

25 Heat radiating Member

26 terminal portion

261 terminal pin

262 cylindrical shell

28 resin seal part

29 cover part

291 Metal part

2911 stepped part

2912 notch part

2913 projection

292 resin part

Detailed Description

Next, a pump device according to an embodiment of the present invention will be described with reference to fig. 1 to 3, in which fig. 1 is a side view schematically showing the pump device according to the embodiment of the present invention, in which an illustration of a cover portion is omitted, fig. 2 is a partial side sectional view schematically showing the pump device according to the embodiment of the present invention, and fig. 3 is a bottom view schematically showing the pump device according to the embodiment of the present invention, in which an illustration of the cover portion is omitted.

Here, for convenience of explanation, three directions orthogonal to each other are set as an X direction, a Y direction, and a Z direction, and one side in the X direction is set as X1, the other side in the X direction is set as X2, one side in the Y direction is set as Y1, the other side in the Y direction is set as Y2, one side in the Z direction is set as Z1, the other side in the Z direction is set as Z2, and the axial direction of the pump device (i.e., the extending direction of the rotation axis of the rotor included in the motor unit) is set to coincide with the Z direction.

(integral construction of Pump device)

As shown in fig. 1 and 2, the pump device 1 includes an impeller portion 10 and a motor portion 20, wherein the impeller portion 10 has an impeller portion case 11, the motor portion 20 is located on the side of the impeller portion 10 in the Z2 direction (i.e., on the first side in the axial direction), and has a resin cylinder portion 22 that abuts the impeller portion case 11 from the Z2 direction side and a cover portion 29 that abuts the cylinder portion 22 from the Z2 direction side and closes the opening of the cylinder portion 22 in the Z2 direction side, the casing of the pump device 1 is constituted by the impeller portion case 11, the cylinder portion 22, and the cover portion 29, and the casing of the pump device 1 is constituted by the cylinder portion 22 and the cover portion 29 on the Z2 direction side.

Here, as shown in fig. 1 and 2, the rotor 211, the stator 212, the circuit board 23, and the heat radiating member 25 are housed in the housing of the pump device 1, wherein the circuit board 23 is located on the Z2 direction side with respect to the rotor 211 and the stator 212, the plate thickness direction coincides with the Z direction, and the heat radiating member 25 is in contact with the heating element 24 provided on the circuit board 23.

(construction of impeller part)

As shown in fig. 1, the impeller portion 10 includes an impeller portion casing 11, the impeller portion casing 11 includes a cover-shaped impeller portion casing body portion 111, a pump chamber is formed inside the impeller portion casing body portion 111, an impeller (not shown) is provided in the pump chamber, and a fluid suction pipe 112 and a fluid discharge pipe 113 are provided on an outer surface side of the impeller portion casing body portion 111.

Here, as shown in fig. 1 and 2, the fluid suction pipe 112 extends from the impeller portion casing main body portion 111 toward the Z1 direction side, and the fluid discharge pipe 113 extends from the impeller portion casing main body portion 111 toward the direction orthogonal to the Z direction, specifically, as shown in fig. 3, the fluid discharge pipe 112 is inclined with respect to both the X direction and the Y direction.

When the impeller of the impeller portion 10 rotates, fluid can be sucked into the pump chamber from the fluid suction pipe 112 and then discharged from the fluid discharge pipe 113.

(Structure of Motor section)

As shown in fig. 1 to 3, the motor section 20 includes: a motor main body 21, the motor main body 21 having a rotor 211 and a stator 212; a cylindrical portion 22, the cylindrical portion 22 surrounding the rotor 211 and the stator 212; a circuit board 23, the circuit board 23 being provided in the vicinity of an end portion of the cylindrical portion 22 on the Z2 direction side so that the thickness direction thereof coincides with the Z direction, and a heating element 24 (for example, three power elements for controlling the rotation of the rotor 211, and the like, in the illustrated example, but not limited thereto) being provided on a surface of the circuit board 23 on the Z2 direction side; a heat radiating member 25, the heat radiating member 25 being in contact with the heating elements 24 (for example, one elastic rubber sheet whose thickness direction coincides with the Z direction, and being in contact with three heating elements 24 at the same time, but not limited thereto); and a cover 29 covering the circuit board 23 from the Z2 direction side, the cover 29 including a metal portion 291 and a resin portion 292, the metal portion 291 and the heat generating element 24 abutting the heat dissipating member 25 from both sides in the Z direction, the resin portion 292 being welded to the tube 22, and the metal portion 291 and the tube 22 being connected to each other.

Here, as shown in fig. 2 and 3, the motor portion 20 further includes a terminal portion 26, the terminal portion 26 includes a plurality of terminal pins 261 penetrating the cylindrical portion 22 in the X direction, one end of each terminal pin 261 is electrically connected to the circuit board 23, and the other end of each terminal pin 261 is surrounded by a cylindrical case 262 formed integrally with the cylindrical portion 22 and protruding from the cylindrical portion 22 in the X1 direction for electrical connection with an external power supply.

As shown in fig. 2, the rotor 211 includes a shaft portion 2111, a cylindrical body 2113 supported by the shaft portion 2111 via a bearing 2112, and a magnet 2114 provided on the outer peripheral side of the cylindrical body 2113, and the stator 212 is opposed to the magnet 2114 on the outer peripheral side with a gap therebetween, and includes a stator core and a coil wound around the stator core. The stator 212 is covered with a resin seal portion 28, the resin seal portion 28 is positioned on the inner peripheral side of the cylindrical portion 22 and is formed integrally with the cylindrical portion 22, a space for accommodating the main body of the rotor 211 is formed on the inner peripheral side of the resin seal portion 28, and the surface of the resin seal portion 28 on the Z2 direction side faces the circuit board 23 with a space in the Z direction. The end portion of the shaft portion 2111 of the rotor 211 on the Z2 direction side is supported by a recessed support portion formed in the resin seal portion 28, and the end portion of the shaft portion 2111 of the rotor 211 on the Z1 direction side (i.e., the second side in the axial direction) is connected to the impeller of the impeller portion 10 and supported by a support portion (not shown) provided in the housing of the pump device 1.

Further, as shown in fig. 2, the metal portion 291 and the resin portion 292 of the cover 29 are formed integrally by insert molding. Specifically, as shown in fig. 2, the metal portion 291 has a plate shape (in the illustrated example, a circular plate shape having a center through which the rotation axis of the rotor 211 passes, but not limited to this), at least a portion of the side of the metal portion 291 opposite to the heat generating element 24 in the Z direction (i.e., the side in the Z2 direction) is exposed from the resin portion 292 to form an exposed portion (in the illustrated example, only the outer peripheral edge of the metal portion 291 is covered with the resin portion 292, that is, portions of the surfaces of both sides of the metal portion 291 in the Z direction other than the outer peripheral edge are exposed from the resin portion 292), a step portion 2911 (in the illustrated example, a protrusion protruding in the Z2 direction and formed at the center of the metal portion 291 as viewed in the Z direction, but not limited thereto) formed by a protrusion or a recess is formed in the exposed portion, and a portion of the metal portion 291 located on the outer peripheral side of the step portion 2911 abuts against the heat radiating member 25 from the Z2 direction side; the resin portion 292 is made of the same material as the tube 22, the resin portion 292 is formed in a substantially annular shape (in the illustrated example, an annular shape having a center penetrated by the rotation axis of the rotor 211, but not limited thereto), the inner peripheral side of the resin portion 292 is connected to the outer peripheral edge of the metal portion 291, the outer peripheral edge of the resin portion 292 is in contact with the axial end face of the tube 22 over the entire circumference, and is connected to the axial end face of the tube 22 by, for example, vibration welding or ultrasonic welding (in the illustrated example, the resin portion 292 includes a main body portion having a U-shape having a cross section taken in the Z direction and being symmetrical with respect to the rotation axis of the rotor 211 and opening in the Z1 direction, and a flange portion extending from the main body portion in the direction perpendicular to the Z direction at the opening of the U-shape and having an engaging portion protruding in the Z1 direction formed thereon, an engaged portion recessed in the Z1 direction is formed on the end surface of the tube portion 22 on the Z2 direction side, and the outer peripheral edge of the resin portion 292 is welded to the end surface of the tube portion 22 on the Z2 direction side over the entire circumference by welding in a state where the engaged portion is engaged with the engaged portion.

(main effect of the present embodiment)

According to the pump device 1 of the present embodiment, the cover 29 includes the metal portion 291 and the resin portion 292, the metal portion 291 and the heat radiating member 25 provided on the circuit board 23 are abutted from both sides in the Z direction (i.e., the axial direction) and the resin portion 292 is welded to the tube portion 22 to connect the metal portion 291 and the tube portion 22, and therefore, the heat radiating member 25 is formed thick without considering the dimensional deviation of the cover 29, that is, the thin heat radiating member 25 can be arranged between the metal portion 291 and the heat radiating element 24 by adjusting the amount of welding of the welded portion, and thus, the heat radiating effect of the heat radiating element 24 on the circuit board 23 can be improved; further, by welding the resin portion 292 to the cylindrical portion 22, it is not necessary to add an O-ring or the like between the cover 29 and the cylindrical portion 22 in order to seal them, so that the assembling work is simplified, the production efficiency is improved, and the production cost is reduced.

Further, according to the pump device 1 of the present embodiment, the metal portion 291 and the resin portion 292 are integrally formed by insert molding, and therefore, the assembly work can be further simplified.

Further, according to the pump device 1 of the present embodiment, since at least a part of the metal portion 291 on the side opposite to the heat generating element 24 in the Z direction (i.e., the axial direction) is exposed from the resin portion 292 to form the exposed portion, the metal portion 291 can be brought into contact with the outside air, and the heat radiation effect can be further improved.

Further, according to the pump device 1 of the present embodiment, since the step portion 2911 formed by the protrusion or the depression is formed in the exposed portion of the metal portion 291 exposed from the resin portion 292, the heat radiation area can be increased, and the heat radiation effect can be further improved; further, since the metal portion 291 and the resin portion 292 are integrally formed by insert molding, the metal portion 291 can be easily positioned in the mold by the step portion 2911 at the time of insert molding, and the positional accuracy of the metal portion 291 can be improved.

The present invention has been described above by way of example with reference to the accompanying drawings, and it is to be understood that the specific implementations of the present invention are not limited to the above-described embodiments.

For example, in the above embodiment, the metal portion 291 and the resin portion 292 are formed integrally by insert molding, but the present invention is not limited to this, and the metal portion 291 and the resin portion 292 may be formed integrally by caulking, for example.

In the above embodiment, the metal portion 291 has a plate shape, but the present invention is not limited to this, and the metal portion 291 may be formed in a block shape.

In the above embodiment, the portion of the metal portion 291 located on the outer peripheral side of the step portion 2911 is in contact with the heat radiation member 25 from the Z2 direction, but the present invention is not limited to this, and the step portion 2911 may be in contact with the heat radiation member 25.

In the above embodiment, as shown in fig. 4, the step portion 2911 formed in the metal portion 291 may have a rectangular shape or another shape.

In the above embodiment, as shown in fig. 4, the notched portion 2912 and the protruding portion 2913 may be formed on the outer peripheral edge of the metal portion 291, or only one of the notched portion 2912 and the protruding portion 2913 may be formed (in the illustrated example, the notched portion 2912 and the protruding portion 2913 are formed in plural at equal intervals, but the present invention is not limited thereto, and the number and the installation position of the notched portion 2912 and the protruding portion 2913 may be appropriately selected as necessary). This helps prevent the metal portion 291 from rotating with respect to the resin portion 292, thereby ensuring the operational stability of the pump device.

In the above embodiment, the metal portion 291 may not be formed with the step portion 2911.

In the above embodiment, as shown in fig. 5, the outer peripheral edge of metal portion 291 may be bent toward the Z1 direction (the bending angle shown in the drawing is close to 90 degrees, but the bending angle is not limited to this, and may be slightly bent), or the outer peripheral edge of metal portion 291 may be bent toward the Z2 direction. Thus, when a thermal shock test needs to be performed on the pump apparatus 1 (that is, when the pump apparatus is placed in an environment in which the temperature repeatedly fluctuates), the outer peripheral edge of the metal portion 291 can suppress the resin portion 292 from expanding and contracting in the radial direction (see the arrow in fig. 5), and therefore, the occurrence of a gap due to the repeated expansion and contraction of the resin at the overlapping portion between the metal portion 291 and the resin portion 292 can be suppressed, and reliability of the waterproof performance can be ensured.

In the above embodiment, the material of the resin portion 292 is the same as the material of the tube 22, but the present invention is not limited to this, and the material of the resin portion 292 may be different from the material of the tube 22.

It should be understood that the present invention can freely combine the respective components in the embodiments or appropriately change or omit the respective components in the embodiments within the scope thereof.

Claims (10)

1. A pump device comprising a housing in which a rotor, a stator, a circuit board located on a first axial side of the rotor and the stator and having a thickness direction that coincides with an axial direction, and a heat radiating member that comes into contact with a heating element provided on the circuit board are housed, wherein the first axial side of the housing is composed of a cylindrical portion made of resin and a cover portion that comes into contact with the cylindrical portion in the axial direction and closes an opening on the first axial side of the cylindrical portion,

the cover portion includes a metal portion and a resin portion,

the metallic part and the heat generating element are in contact with the heat radiating member from both sides in the axial direction,

the resin portion is welded to the tube portion, thereby connecting the metal portion to the tube portion.

2. The pump apparatus of claim 1,

the metal part and the resin part are formed integrally by insert molding.

3. The pump apparatus of claim 1,

at least a part of the metal portion on the side opposite to the heat generating element in the axial direction is exposed from the resin portion to form an exposed portion.

4. Pump apparatus according to claim 3,

a step portion formed of a protrusion or a recess is formed in the exposed portion.

5. The pump apparatus of claim 4,

the heat dissipation member is an elastic sheet,

the step portion is in contact with the heat radiating member,

the metal part is in the shape of a plate,

only an outer peripheral edge of the metal portion is covered with the resin portion.

6. The pump apparatus of claim 2,

a notch portion and/or a protrusion portion is formed on an outer peripheral edge of the metal portion.

7. The pump apparatus of claim 2,

the metal part is in the shape of a plate,

the outer peripheral edge of the metal portion is bent toward a first side in the axial direction or a second side opposite to the first side.

8. The pump apparatus of claim 1,

the material of the cylindrical portion is the same as that of the resin portion.

9. The pump apparatus of claim 1,

the outer peripheral edge of the resin portion is welded in contact with the axial end surface of the cylindrical portion in the entire circumferential direction.

10. The pump apparatus of claim 1,

the casing accommodates an impeller that is located on a second side opposite to the first side with respect to the rotor and the stator and is driven by the rotor to rotate.

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