CN211778044U

CN211778044U - Pump device

Info

Publication number: CN211778044U
Application number: CN202020144253.7U
Authority: CN
Inventors: 小窪信树; 山本岳; 仓谷大树
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Instruments Corp
Priority date: 2019-01-29
Filing date: 2020-01-22
Publication date: 2020-10-27
Anticipated expiration: 2030-01-22
Also published as: JP2020122397A; CN111486097A

Abstract

The utility model provides a pump device aims at improving the resistance to pressure of device. The pump device is provided with: an impeller (23); a rotor (40) connected to the impeller; a stator (50) disposed around the rotor; a resin sealing member (60) covering the stator; and a metal member (90) having a contact surface that contacts the surface of the resin seal member, wherein the metal member has a plurality of protruding portions (93) that extend from the outer edge portion of the contact surface toward the resin seal member, and wherein portions of the plurality of protruding portions that are located on the central portion side of the contact surface face the resin seal member. Each of the projections (93) has a function of suppressing the expansion deformation of the resin seal member (60).

Description

Pump device

Technical Field

The utility model relates to a pump unit with motor integration.

Background

A conventional pump device integrated with a motor includes, for example, a pump housing, an impeller, a rotor, a stator, a circuit board, and the like.

When the fluid to be sucked and discharged is a liquid such as water, the stator of the motor and the circuit board are sealed by a resin molded body in order to ensure water tightness with respect to the liquid in the pump chamber. A rotor is disposed inside the stator, and the rotor is connected to an impeller disposed in a pump chamber of the pump housing.

The pump casing includes a suction port and a discharge port, and fluid can be sucked into the pump chamber from the suction port and discharged from the discharge port by rotation of the rotor and the impeller (see, for example, patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-166365

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved by the utility model

In recent years, a pump device is required to have high pressure resistance.

For example, in the case where the suction and discharge of the liquid are performed in an environment where the pressure reducer cannot be used, if the flow of the liquid is suddenly blocked on the downstream side of the pump device, a water hammer phenomenon occurs, and a high pressure is applied to the pump chamber of the pump device.

In this case, the resin molded article made of the resin may be deformed by pressure and may be damaged.

The utility model aims to improve the pressure resistance of the device.

Technical scheme for solving technical problem

In order to solve the above technical problem, the utility model provides a pump device, a serial communication port, pump device possesses: an impeller; a rotor connected to the impeller; a stator disposed around the rotor; a resin sealing member covering the stator; and a metal member having a contact surface that contacts a surface of the resin seal member, wherein the metal member has a plurality of protruding portions that extend from an outer edge portion of the contact surface toward the resin seal member, and a portion of the plurality of protruding portions that is located on a central portion side of the contact surface faces the resin seal member.

In the pump device of the present invention, the resin seal member is opposed to a portion of the plurality of projections extending from the outer edge portion of the contact surface of the metal member toward the resin seal member, the portion being located on the central portion side of the contact surface.

Pressure is applied to the resin seal member by pressure of a water hammer phenomenon or the like, and stress is applied that causes the resin seal member to generate deformation that expands outward with respect to the contact surface of the metal member.

However, since the central portion of the contact surface of each of the projecting portions faces the resin seal member, even if the resin seal member expands, the resin seal member can abut against each of the projecting portions to suppress the expansion. Therefore, deformation, damage of the resin seal member caused by expansion of the resin seal member can be suppressed, and deformation of the contact surface of the metal member can also be suppressed.

Therefore, the pressure resistance of the pump device can be improved.

In the pump device of the present invention, a portion of the plurality of protrusions located on the central portion side of the contact surface abuts against the resin seal member.

The pump device of the present invention can effectively suppress the expansion of the resin seal member by causing the portions of the respective projecting portions on the side of the central portion of the contact surface to abut against the resin seal member.

In the pump device of the utility model, it is characterized in that,

some or all of the protruding portions are attached to the resin seal member by screws that pass through the inside of the protruding portions and along the extending direction of the protruding portions.

In the pump device of the present invention, since a part or all of the protruding portions are attached to the resin seal member by screws along the extending direction of the protruding portions, the inclination of the protruding portions is suppressed by the screws. Accordingly, the expansion deformation of the metal member is suppressed, and the deformation of the resin seal member can be suppressed more effectively.

The utility model discloses an among the pump unit, its characterized in that possesses: a housing that houses the impeller and forms a pump chamber; a partition member that isolates the resin seal member from a fluid in the pump chamber, the housing, the partition member, the resin seal member, and the metal member being arranged in this order along an axial direction of the rotor; the screw connects the housing, the partition member, the resin seal member, and the metal member.

In the pump device of the present invention, the housing, the partition member, the resin seal member, and the metal member are connected by the screw, so that the number of parts can be reduced as compared with a case where the members are connected respectively.

In the pump device of the present invention, the protruding portion is formed with a screw hole.

The utility model discloses an among the pump unit, its characterized in that, the screw link up form extremely metal part with the opposite side of resin seal part.

In the pump device of the present invention, the screw hole is formed through to the metal member on the side opposite to the resin seal member, so that the pump device can be fixedly mounted on another external component by using the portion of the screw hole which is not reached by the screw. Thus, the number of screw holes for mounting the pump device can be reduced, the number of manufacturing steps can be reduced, and the reduction in strength due to the formation of other screw holes can be reduced.

In the pump device of the present invention, the metal member has a reinforcing rib on a side opposite to the resin seal member.

The pump device of the present invention has the reinforcing rib on the side of the metal member opposite to the resin seal member, and therefore can suppress the deformation of the contact surface of the metal member expanding outward, and further suppress the deformation of the resin seal member.

The pump device of the present invention is characterized by comprising a circuit board sealed by the resin sealing member, wherein the circuit board is disposed closer to the metal member than the stator.

The utility model discloses a pump unit is because circuit substrate disposes in the resin seal part in the one side that is close to metal parts than the stator, so from the heat transfer that stator and circuit substrate produced to metal parts and heat dissipation, consequently can cool off circuit substrate, protects its influence of being heated.

Effect of the utility model

In the pump device according to the present invention, the resin seal member is opposed to a portion of the plurality of projections extending from the outer edge portion of the contact surface of the metal member toward the resin seal member, the portion being located on the central portion side of the contact surface.

Pressure is applied to the resin seal member by pressure of a water hammer phenomenon or the like, and stress is applied to cause the resin seal member to expand and deform outward with respect to the contact surface of the metal member.

However, since the central portion of the contact surface of each of the projecting portions faces the resin seal member, even if the resin seal member expands, the resin seal member can abut against each of the projecting portions to suppress the expansion. Therefore, even if the extending end portion is inclined in a direction of falling toward the central portion of the contact surface, the projecting portions come into contact with the resin seal member and are pushed back, and the inclination of the extending end portion is suppressed. Therefore, deformation, damage of the resin seal member caused by expansion of the resin seal member can be suppressed, and deformation of the contact surface of the metal member can also be suppressed.

Therefore, the pressure resistance of the pump device can be improved.

Drawings

Fig. 1 is a perspective view of a pump device according to an embodiment of the present invention.

Fig. 2 is a longitudinal section of the pump device along an axis passing through the centre of the rotor.

Fig. 3 is a perspective view of the metal member as viewed from obliquely above.

Fig. 4 is a perspective view of the metal member as viewed obliquely from below.

Fig. 5 is a shaft vertical sectional view of the pump device showing a section perpendicular to an axis passing through the projection.

Fig. 6 is a partial axial cross-sectional view of the pump device showing a cross-section through the center of the threaded hole.

Description of the reference numerals

10 pump device

20 pump mechanism part

21 casing

22 pump chamber

23 impeller

24 column part

30 electric motor

40 rotor

41 rotating shaft

50 stator

54 coil

60 resin sealing member

65 column part

66 recess

70 circuit board

80 separation board (partition wall component)

86 circular part

90 metal component

91 main body part

92 annular Rib

93 projection

94 screw

96 screw hole

241. 861, 651 through hole

L axis

Detailed Description

[ summary of embodiments ]

As an embodiment of the present invention, the pump device 10 will be described with reference to the drawings. Fig. 1 is a perspective view of the pump apparatus 10, and fig. 2 is a longitudinal sectional view of the pump apparatus 10 along an axis L passing through the center of a rotor 40 (described later).

The pump device 10 is suitable for the following purposes: the fluid to be sucked and discharged is a liquid, and is mounted on a water heater, a washing machine, a dishwasher, or the like, and is connected to a tap water pipe for supplying tap water to a device as a parent.

In the following description, as shown in fig. 1 and 2, one direction along the axis L of the rotor shaft of the pump device 10 is simply defined as an "upper" side Z1 of the device, and the opposite direction is simply defined as a "lower" side Z2. The direction perpendicular to the axis L is a horizontal direction. The horizontal direction, i.e., the direction in which the lead connection portions 71 of the circuit board 70 described later extend, is referred to as "front" side Y1 of the device, and the opposite direction is referred to as "rear" side Y2. In addition, when the pump device 10 is viewed from the lead wire connection portion 71 side, the left side is the "left" side X1 of the device, and the opposite direction is the "right" side X2.

The pump device 10 includes a pump mechanism 20 for sucking and discharging a fluid and a motor 30 as a drive source thereof, and is configured to be integrated with each other.

The pump mechanism unit 20 mainly includes a housing 21 having a pump chamber 22 formed therein, and an impeller 23 disposed in the pump chamber 22.

Further, the motor 30 includes: a rotor 40; a stator 50 disposed around the rotor 40; a resin sealing member 60 covering the stator 50; a circuit board 70 connected to the coil 54 of the stator 50; a separation plate 80 as a partition member for isolating the resin seal member 60 from the fluid in the pump chamber 22; and a metal member 90 provided on an upper end surface of the resin sealing member 60.

[ Pump mechanism ]

As shown in fig. 1 and 2, the housing 21 of the pump mechanism 20 includes a substantially cylindrical peripheral wall 211 centered on the axis L, and a bottom plate 212 closing a lower end of the peripheral wall 211. The upper end of the peripheral wall 211 is connected to the lower end of the resin sealing member 60 of the motor 30 via the separation plate 80.

The peripheral wall 211 has a substantially circular cross section perpendicular to the axis L, and the resin sealing member 60 has a substantially circular cross section perpendicular to the axis L. The peripheral wall portion 211 and the resin sealing member 60 are concentrically connected.

A tubular fluid inlet 213 extending downward Z2 is formed in the center of bottom plate 212. Further, a tubular fluid discharge port 214 is formed on the outer periphery of the peripheral wall portion 211.

The fluid suction port 213 is formed concentrically with the peripheral wall portion 211 at the center of the bottom plate portion 212.

On the other hand, the fluid discharge port 214 extends in the horizontal direction parallel to the tangential direction of the circular peripheral wall portion 211 in plan view.

Both the fluid inlet 213 and the fluid outlet 214 communicate with the pump chamber 22, which is the internal space of the housing 21.

In the center of the inside of the housing 21, a cylindrical first rotor support portion 215 centered on an axis L to be described later is provided. The first rotor support portion 215 is open toward the upper side Z1, and supports the lower end portion of the rotary shaft 41 of the rotor 40 by being inserted thereinto.

The first rotor support portion 215 is located directly above the fluid suction port 213 and on the path of the fluid flowing in from the fluid suction port 213. However, since it is supported by three blade-shaped leg portions (one is omitted in the drawing) 216 provided upright on the upper surface of the bottom plate portion 212, fluid can pass between the leg portions 216 without hindering the inflow of fluid.

As described above, the impeller 23 is disposed at the center of the pump chamber 22 with the axis L as the rotation center. The impeller 23 includes a circular rotating plate 232 having an open center, and a plurality of spiral blades 231 provided upright on the upper surface of the rotating plate 232.

The first rotor support portion 215 and the leg portion 216 are loosely inserted into an opening in the center of the rotating plate 232.

The upper end of each blade 231 of the impeller 23 is fixedly connected to the lower end of the rotor 40.

The impeller 23 rotates about the axis L together with the rotor 40 by the driving of the motor 30, and the fluid in the pump chamber 22 flows in the rotational direction by the plurality of vanes 231. As a result, the fluid generates a centrifugal force, and the radially inner side is at a low pressure and the radially outer side is at a high pressure, thereby sucking the fluid from the fluid suction port 213 and discharging the fluid from the fluid discharge port 214.

[ Motor: resin sealing member and separator

As shown in fig. 2, the resin sealing member 60 includes a substantially cylindrical peripheral wall portion 61 centered on the axis L and an upper wall portion 62 closing an upper end portion of the peripheral wall portion 61. The peripheral wall 61 and the upper wall 62 constituting the resin sealing member 60 are integrally molded by Bulk Molding Compound (BMC) as a thermosetting resin material.

The upper surface of the upper wall 62 is flat and horizontal, and a metal member 90 is mounted thereon.

Further, the upper wall portion 62 is embedded in a substantially circular circuit board 70 having an outer diameter slightly smaller than that of the upper wall portion 62 in a horizontal state in most portions.

The peripheral wall portion 61 is formed to seal substantially the entire structure of the stator 50 inside with resin.

The peripheral wall portion 61 is opened downward, and the case 21 is attached via a separation plate 80 to close the opening.

The rotor 40 is disposed in the inner space of the peripheral wall 61. The inner space of the peripheral wall portion 61 communicates with the pump chamber 22 of the housing 21. However, in this state, since the fluid in the pump chamber 22 can enter the stator 50 embedded in the peripheral wall portion 61 through the pump mechanism portion 20, a separation plate 80 for sealing the fluid is provided between the resin seal member 60 and the housing 21.

The separation plate 80 includes: a flange portion 81 closely contacting the lower end surface of the peripheral wall portion 61 of the resin sealing member 60; a cylindrical portion 82 closely contacting the inner circumferential surface of the circumferential wall 61; a top portion 83 closely attached to the lower surface of the upper wall portion 62 of the resin sealing member 60; and an annular bulging portion 84 located between the flange portion 81 and the cylindrical portion 82 and bulging downward Z2.

The flange 81, cylindrical 82, top 83 and bulge 84 of the separator plate 80 are integrally formed of a resin material in a seamless manner, and all of them have a fluid-blocking function.

The flange portion 81 is sandwiched between and seals the lower end surface of the peripheral wall portion 61 of the resin seal member 60 and the upper end surface of the peripheral wall portion 211 of the housing 21.

The bulging portion 84 bulges and fits inside the upper end portion of the peripheral wall portion 211 of the housing 21. An O-ring 841 as a sealing material is provided between the outer periphery of the bulging portion 84 and the inner periphery of the peripheral wall portion 211, and the O-ring 841 also provides a fluid seal.

The rotor 40 is disposed inside the cylindrical portion 82 with a gap. The stator 50 is disposed on the outer peripheral side of the cylindrical portion 82, and the rotor 40 and the stator 50 are disposed close to each other via the cylindrical portion 82.

A cylindrical second rotor support portion 85 centered on the axis L is disposed at the center of the lower surface of the top portion 83. The second rotor support portion 85 is open toward the lower side Z2, and supports the upper end portion of the rotary shaft 41 of the rotor 40 by being inserted thereinto.

The second rotor support portion 85 is formed integrally with the top portion 83 from the same resin material as the top portion 83.

[ Motor: rotor (C)

As shown in fig. 2, the rotor 40 includes: a rotating shaft 41 disposed along the vertical direction with the axis L as the center; a magnet 42 provided on the outer periphery of the rotating shaft 41; and a holding member 43 that holds the magnet 42 at a position concentric with the rotary shaft 41.

The rotary shaft 41 is a stainless steel round bar, and its lower end is supported by the first rotor support part 215 and its upper end is supported by the second rotor support part 85.

The holding member 43 includes a cylindrical portion 431 for holding the magnet 42 at an upper portion thereof, and a circular flange portion 432 at a lower portion thereof.

The flange portion 432 is a disk having substantially the same diameter as the impeller 23, and fixedly supports the impeller 23 on the lower surface side thereof.

An annular magnet 42 is held on the outer periphery of the cylindrical portion 431 concentrically with the rotary shaft 41. The cylindrical portion 431 includes a sleeve 44 therein, and the sleeve 44 is a slide bearing. Therefore, the holding member 43 can rotate integrally with the magnet 42 and the impeller 23 around the rotation shaft 41.

The cylindrical portion 431 has radially enlarged

portions

431a and 431b formed inside the lower end and the upper end thereof, respectively. The first rotor support part 215 is loosely inserted inside the lower enlarged diameter part 431a, and the second rotor support part 85 is loosely inserted inside the upper enlarged diameter part 431 b.

The first rotor support portion 215 and the second rotor support portion 85 can be disposed inside the cylindrical portion 431 by the diameter-enlarged

portions

431a and 431b, and the pump device 10 can be downsized in the vertical direction.

As described above, the magnet 42 has a ring shape, and N poles and S poles are alternately magnetized in the circumferential direction on the outer periphery thereof.

[ Motor: stator)

As shown in fig. 2, the stator 50 includes: an annular stator core 51 facing the outer peripheral surface of the magnet 42 of the rotor 40 via the cylindrical portion 82 of the separator plate 80; a plurality of coils 54 wound around the stator core 51 via the upper and

lower insulators

52 and 53.

The stator core 51 is formed of a magnetic material, and includes an annular portion 511 centered on the axis L and nine salient pole portions 512 extending from the inner peripheral surface of the annular portion 511 toward the axis L at the center. The projecting pole portions 512 are formed at equal angular intervals in the circumferential direction around the axis L. Each of the projecting electrode portions 512 has an opposing portion 513 extending in the circumferential direction around the axis L at an extending end thereof. The opposing portion 513 faces the outer peripheral surface of the magnet 42 of the rotor 40 with a predetermined gap via the cylindrical portion 82 of the separation plate 80.

The upper and

lower insulators

52 and 53 are formed of an insulating material such as resin, are paired up and down, and cover the salient pole portions 512 of the stator core 51 and the periphery thereof.

The insulator 52 on the upper side Z1 includes: a body 521 which is a cylindrical body covering the upper half of the projecting pole 512; an outer flange 522 covering an upper half of an inner peripheral surface of the annular portion 511; an inner flange portion 523 covering the upper half of the outer peripheral surface of the opposing portion 513.

The insulator 53 on the lower side Z2 includes: a body 531 which is a cylindrical body covering the lower half of the projecting pole 512; an outer flange 532 covering the lower half of the inner peripheral surface of the annular portion 511; and an inner flange 533 covering the lower half of the outer peripheral surface of the opposing part 513.

Note that, like the upper and

lower insulators

52 and 53, the periphery of each salient pole portion 512 of the stator core 51 is covered with the upper and lower two-half structure, but the insulator may be integrally formed with the stator core 51 by insert molding with respect to the stator core 51.

The coil 54 is made of a conductive wire made of an aluminum alloy or a copper alloy and wound around the salient pole portion 512 of the stator core 51 via the upper and

lower insulators

52 and 53.

The motor 30 is a three-phase brushless motor, and the nine coils 54 formed on the nine salient-pole portions 512 are each composed of three U-phase coils, three V-phase coils, and three W-phase coils.

[ Motor: circuit board

The circuit substrate 70 is provided with hall elements that detect the rotational position of the rotor 40.

The circuit board 70 is connected to the lead wires of the coils 54 of the stator 50, and is provided with a circuit for controlling the current flowing through each coil 54 in accordance with the rotational position of the rotor 40 detected by the hall element.

The circuit board 70 is circular in overall shape (shape viewed from the direction of the axis L) in plan view, is sealed in the vicinity of the upper end of the resin sealing member 60, and is provided closer to the metal member 90 than the stator 50.

A lead connection portion 71 for connecting a lead 72 for connection to a power circuit or the like outside the apparatus extends radially outward from the circuit board 70.

The lead wire connection portion 71 protrudes outward from the vicinity of the upper end portion of the front side Y1 of the resin sealing member 60, and the lead wire 72 is connected to the outside of the resin sealing member 60.

A case member 75 is attached to the upper end of the front side Y1 of the resin sealing member 60, and surrounds and protects the lead connecting portion 71 protruding to the outside.

[ Motor: metal parts

Fig. 3 is a perspective view in which the upper surface of the metal member 90 can be seen, and fig. 4 is a perspective view in which the lower surface can be seen.

As described above, the metal member 90 is a reinforcing member provided on the upper surface of the resin sealing member 60.

The metal member 90 includes: a disc-shaped body 91 having a lower surface serving as a contact surface and closely contacting an upper surface (front surface) of the resin sealing member 60; an annular rib 92 formed on the outer peripheral portion of the upper surface of the main body 91; four protruding portions 93 (only two are shown in fig. 1) provided at the outer peripheral portion of the lower surface of the main body portion 91 at uniform intervals in the circumferential direction. In the metal member 90, the main body portion 91, the annular rib 92, and the protruding portion 93 are integrally formed of a metal material, for example, by aluminum die casting.

The annular rib 92 is a convex strip having a rectangular cross section, and is formed in a ring shape along the outer periphery of the body 91. The annular rib 92 has a wider width in the radial direction and a wider width in the axial direction in cross section than the thickness of the main body 91, and imparts high rigidity to the flat plate-shaped main body 91, thereby effectively suppressing flexure of the main body 91 or protrusion and depression of the central portion of the main body 91.

The projecting portion 93 is cylindrical projecting downward Z2 from the outer peripheral portion of the lower surface of the main body 91, and has a screw hole 96 penetrating through the center. The projection 93 and the screw hole 96 are parallel to the axis L. The screw hole 96 penetrates from the lower end surface of the projection 93 to the upper end surface of the annular rib 92, and a thread groove is formed in the screw hole 96 throughout the entire length thereof. A screw 94 for fixing the metal member 90 to the resin seal member 60 is screwed into the screw hole 96.

In addition, four protrusions 93 and screw holes 96 are formed at 90 ° intervals in the circumferential direction on the outer peripheral portion of the lower surface of the metal member 90.

Fig. 5 is an axial vertical sectional view showing the pump apparatus 10 in a section perpendicular to the axis L passing through the projection 93, and fig. 6 is a partial axial sectional view showing the pump apparatus 10 in a section passing through the center of the screw hole 96.

As shown in fig. 5, the center of each projection 93 is located slightly radially outward of the outer periphery of the resin seal member 60. On the other hand, recesses 66 are formed at four circumferential positions at the upper end portion of the outer periphery of the resin seal member 60, and the recesses 66 are recessed in an arc shape so as to face a portion of the outer peripheral surface of each projection 93 on the center side (the axis L side) of the resin seal member 60.

The inner peripheral surface of the recess 66 faces the center side portion of the resin seal member 60 on the outer peripheral surface of each projection 93, and the lower end portion of each projection 93 is suppressed from being deviated toward the center side of the resin seal member 60.

A part of the outer peripheral surface of each projection 93 on the center side (the axis L side) of the resin seal member 60 may be in contact with each recess 66. Further, even when they are not in contact with each other, they are preferably closer to each other.

Further, four columnar portions 65 are formed at positions on the lower end surface of each projection 93 that become the lower side Z2, and these four columnar portions 65 are formed integrally with the resin sealing member 60 on the outer peripheral surface of the resin sealing member 60. Each columnar portion 65 has a columnar shape having an outer diameter substantially equal to that of the protruding portion 93, and is formed with a through hole 651 concentric with the threaded hole 96 of the protruding portion 93. The through hole 651 has an inner diameter slightly larger than the screw hole 96, and a screw 94 can be inserted therethrough.

Further, four circular portions 86 are formed at positions on the lower end surface of each columnar portion 65 of the resin sealing member 60 that become the lower side Z2, and these four circular portions 86 are formed integrally with the flange portion 81 of the separation plate 80 on the outer peripheral surface of the flange portion 81. Each circular portion 86 is disc-shaped having an outer diameter substantially equal to that of the columnar portion 65, and has a through hole 861 formed concentrically with and having the same diameter as the through hole 651.

In addition, four columnar portions 24 are formed at a position that becomes a lower side Z2 of the lower end surface of each circular portion 86 of the separation plate 80, and these four columnar portions 24 are formed integrally with the peripheral wall portion 211 of the housing 21 on the outer peripheral surface of the peripheral wall portion 211. Each columnar portion 24 is columnar having an outer diameter substantially equal to that of the circular portion 86, and has a through hole 241 formed concentrically with the through hole 861 and having the same diameter.

The metal member 90, the resin seal member 60, the separation plate 80, and the case 21 are arranged in this order from the top to the bottom Z2 along the direction of the axis L. Further, a screw 94 is inserted from the lower end of each through hole 241 of the housing 21 toward the upper side Z1, and the upper end of the screw 94 is screwed into the screw hole 96 of each protruding portion 93 through the through

holes

241, 861, 651. By the connection of the screws 94, the metal member 90, the resin sealing member 60, the partition plate 80, and the housing 21 are pressed in the direction of the axis L and closely connected without a gap.

The respective screws 94 are set to have lengths that are slightly different from each other at the axial intermediate portion of the respective screw holes 96 in the coupled state.

Therefore, each screw hole 96 is opened from its upper end to about half of the depth.

The unused portion extending from the upper end of each screw hole 96 to about half the depth may be used as a mounting hole for mounting the pump device 10 to an external installation site or the like.

[ operation of Pump device ]

In the pump device 10 having the above-described configuration, the outer ends of the lead wires 72 are connected to a power supply or the like outside the device, and the plurality of coils 54 of the motor 30 are energized in a predetermined order by the circuit board 70, whereby the rotor 40 rotates.

As the impeller 23 of the pump mechanism 20 rotates, the fluid flows in the pump chamber 22 in the circumferential direction around the axis L, and the fluid is sucked into the pump chamber 22 through the fluid suction port 213 and discharged through the fluid discharge port 214.

[ technical effects of embodiments of the present invention ]

The portions of the outer peripheral surface of the plurality of protrusions 93 of the metal member 90 of the pump device 10, which portions are located on the center side (on the axis L side) of the lower surface of the metal member 90, face the recessed portions 66 of the resin seal member 60. Therefore, even when the resin sealing member 60 is pressurized upward from the inside, the protrusions 93 are supported by the recesses 66, and the lower end portions thereof are suppressed from being deflected toward the center side, whereby the upward bulge of the main body portion 91 of the metal member 90 is suppressed.

Further, since the portions of the outer peripheral surfaces of the respective projections 93 that become the center portion side (the axis L side) of the lower surface of the metal member 90 face the recess 66 of the resin seal member 60, even if the resin seal member 60 expands, the resin seal member 60 can be brought into contact with the respective projections 93 to suppress the expansion.

Therefore, deformation of the resin seal member 60 is suppressed, and the pressure resistance of the pump device 10 can be improved.

In addition, in the case of the configuration in which the portions of the outer peripheral surfaces of the plurality of projecting portions 93 of the metal member 90 of the pump device 10, which portions are on the central portion side of the lower surface of the metal member 90, are in contact with the recessed portions 66 of the resin seal member 60, there is no gap between the projecting portions 93 and the recessed portions 66, and deformation of the resin seal member 60 can be more effectively suppressed.

Further, since the respective projecting portions 93 of the metal member 90 are attached to the resin seal member 60 by screws 94 parallel to the axis L, the screws 94 can suppress the deflection of the respective projecting portions 93, suppress the bulging of the main body portion 91 of the metal member 90 and the expansion of the resin seal member 60, and suppress the deformation of the resin seal member 60.

Further, the screws 94 penetrate the case 21, the partition member 80, the resin seal member 60, and the metal member 90 vertically and are fastened to the screw holes 96, so that the case 21, the partition member 80, the resin seal member 60, and the metal member 90 are pressed from above and below, and downward tension is applied to the protrusions 93. Therefore, a function of suppressing the deflection of each projecting portion 93 by the tension generated by the screw 94 is also generated, whereby the bulging of the main body portion 91 of the metal member 90 can be suppressed, and the deformation of the resin seal member 60 can also be suppressed.

Further, since each screw hole 96 penetrates the upper surface of the metal member 90, the upper portion of the screw hole 96 can be used as a mounting hole of the pump device 10, the number of parts for mounting can be reduced, and the number of manufacturing steps of the mounting structure can be reduced.

Further, by providing the annular reinforcing rib 92 on the upper surface of the main body 91 of the metal member 90, the expansion of the main body 91 of the metal member 90 is suppressed, and the deformation of the resin seal member 60 can be further suppressed.

The circuit board 70 is embedded in the vicinity of the upper end surface of the resin sealing member 60, and the metal member 90 is provided to face the upper end surface of the resin sealing member 60. Therefore, the metal member 90 is disposed closer to the circuit board 70 than the stator 50, and heat generated from the stator 50 and the circuit board 70 is conducted to the metal member 90, and the metal member 90 radiates heat well due to its thermal conductivity, so that the circuit board 70 can be cooled and protected from heat.

Further, since the metal member 90 is fastened by the screw 94, the adhesion with the resin sealing member 60 can be improved, and heat can be dissipated more effectively.

[ others ]

The details shown in the embodiments may be appropriately modified without departing from the spirit and scope of the present invention.

For example, the number of the protruding portions 93 of the metal member 90 is not limited to four, and may be increased or decreased, but it is desirable to have a plurality of protruding portions. Preferably, the lower surface of the body 91 is disposed so as to be dispersed toward the outer periphery.

In the case where a plurality of projections 93 are provided, the screw holes 96 may not be provided in all the projections 93.

The metal member 90 is not limited to the screw 94, and may be attached to the resin sealing member 60 by another method.

The metal member 90 may be provided with a coating material that radiates with high efficiency, a heat dissipation structure that applies a coating, a heat sink, or the like on a surface other than the surface that contacts the resin sealing member 60, thereby effectively cooling the circuit board 70.

Further, a heat radiation lubricating oil may be added between the contact surface of the metal member 90 and the resin seal member 60 to improve heat radiation.

In the circuit board 70, heat-generating components may be exposed from the upper surface of the resin sealing member 60 and may be in direct contact with the metal member 90, thereby improving heat dissipation.

Claims

1. A pump device is characterized by comprising:

an impeller;

a rotor connected to the impeller;

a stator disposed around the rotor;

a resin sealing member covering the stator;

a metal member having a contact surface that contacts a surface of the resin sealing member,

the metal member has a plurality of protruding portions extending from an outer edge portion of the contact surface toward the resin seal member,

the resin sealing member is disposed between the plurality of projections and the resin sealing member.

2. Pump apparatus according to claim 1,

portions of the plurality of protruding portions on a central portion side of the contact surface abut against the resin seal member.

3. Pump apparatus according to claim 2,

4. The pump device according to claim 3, characterized in that the pump device comprises:

a housing that houses the impeller and forms a pump chamber;

a partition member that isolates the resin sealing member from a fluid in the pump chamber,

the housing, the partition member, the resin sealing member, and the metal member are arranged in this order along an axial direction of the rotor,

the screw connects the housing, the partition member, the resin seal member, and the metal member.

5. The pump arrangement according to claim 4,

the protruding portion is formed with a screw hole.

6. Pump apparatus according to claim 5,

the screw hole is formed through to the side of the metal member opposite to the resin sealing member.

7. The pump arrangement according to claim 6,

the metal member has a reinforcing rib on a side opposite to the resin sealing member.

8. Pump apparatus according to claim 1,

9. Pump apparatus according to claim 1,

10. Pump arrangement according to any one of claims 1 to 9,

the pump device comprises a circuit board sealed by the resin sealing member,

the circuit board is disposed on a side closer to the metal member than the stator.