CN209925160U - Electronic pump and circuit board assembly thereof - Google Patents

Abstract

The utility model provides an electronic pump and circuit board assembly thereof. The circuit board assembly comprises a circuit board assembly shell, and the periphery of the circuit board assembly shell is provided with a through vent hole. The electronic pump comprises the circuit board assembly. Compare the air vent in present electronic pump and set up on motor housing's end cover usually, the utility model discloses an electronic pump can avoid taking place the conflict and influence the ventilation and the life of electronic pump during assembly and the use of electronic pump to motor housing's end cover can seal, and no longer need the trompil.

Description

Electronic pump and circuit board assembly thereof

Technical Field

The utility model relates to a circuit board assembly for electronic pump. Furthermore, the present invention relates to an electronic pump comprising such a circuit board assembly.

Background

With the increasing demands for vehicle emissions, energy conservation and automation, there is an increasing demand for electronic pumps. In current electronic pumps, a circuit board assembly is separately mounted within the pump, electrically connected to the motor, to control the operation of the motor. The circuit board assembly includes connectors to provide electrical signals and power to the motor.

In the conventional electronic pump, the connector is generally disposed at an end portion of the motor, and an extending direction thereof is generally different from a direction of an output shaft of the motor. With this arrangement, the length of the connector is typically insufficient to meet the customer's needs. In addition, in order to assemble the motor rotor and ventilate to balance the internal and external pressures, a central (ventilation) hole is usually required to be formed at a bearing seat (a bearing for supporting an output shaft) of the motor housing, which may conflict with the outside during the assembly and use of the electronic pump, affect the ventilation of the electronic pump, and further, adversely affect the service life of the electronic pump.

Disclosure of Invention

Due to the above arrangement of the existing electronic pump, its application is very limited. It is therefore an object of the present invention to provide an improved electronic pump of a new construction compared to the present electronic pumps, which at least alleviates or overcomes the disadvantages associated with the above-mentioned arrangements.

According to a first aspect, the present invention provides a circuit board assembly for an electronic pump. The circuit board assembly includes a circuit board assembly housing having a vent hole formed therethrough at an outer peripheral side thereof. With this arrangement, because no vent hole needs to be formed on the motor end cover, the conflict between the assembly and the use period of the electronic pump and the outside world is avoided, and the motor end cover can be closed, so that the sealing performance is improved.

Preferably, the vent hole extends along the L-shaped passage. To prevent liquids such as water and oil from entering the circuit board assembly, the inside of the vent holes are typically covered with a gas permeable, but oil and water impermeable membrane. The L-shaped arrangement can prevent liquid such as water and the like from directly impacting the diaphragm. Moreover, when in use, the outlet of the air vent always impacts the ground, thereby reducing the possibility of liquid and impurities entering and being beneficial to discharging the liquid and the impurities.

According to the utility model discloses an embodiment, circuit board assembly shell is equipped with the abrupt rib that extends along circumference on the terminal surface edge. Thus, a gap between the pump housing and the circuit board assembly of the electronic pump due to a height error can be eliminated.

According to the utility model discloses an embodiment, circuit board assembly shell is equipped with the semi-circular arc face that circumference distributes in week side. The semi-circular arc surface extends parallel to a longitudinal axis of the circuit board assembly. The semi-circular arc surface facilitates adjusting the concentric arrangement between the magnetic ring of the motor and the hall sensor of the circuit board assembly.

According to the utility model discloses an embodiment, circuit board subassembly shell is equipped with along the fin of circumference distribution in week side. The fins extend perpendicular to a longitudinal axis of the circuit board assembly. Preferably, the fins are arranged on a semicircular arc surface. The fins may engage corresponding slots on the pump housing to secure the circuit board assembly to the pump housing.

According to the utility model discloses, can realize circuit board assembly's location placed in the middle and fixed better.

According to a second aspect, the present invention provides an electronic pump comprising the circuit board assembly described above.

According to the utility model discloses an embodiment, the electronic pump still includes the motor, and the motor includes the output shaft, and circuit board components includes the connector, and wherein the output shaft stretches out outside the motor, and the extending direction of output shaft and connector is the same. This arrangement facilitates specific installation requirements.

According to the utility model discloses an embodiment, the connector has the connector terminal, and circuit board assembly still includes the fixed pin of circuit board and fixed circuit board, and the extending direction of connector terminal is the same with the direction of stretching out of fixed pin. This arrangement facilitates the manufacture of the circuit board assembly.

According to the utility model discloses an embodiment, the electronic pump still includes the pump, and circuit board assembly is located between motor and the pump. With this arrangement, the size of the electronic pump can be reduced, and the length of the connector can be satisfied by the customer.

According to the utility model discloses an embodiment, motor and pump include motor housing and pump housing respectively, and motor housing and pump housing are fixed with the help of first fixing device each other. The first fixing means may be a bolt.

According to the utility model discloses an embodiment, the output shaft is installed on the corresponding first and second bearing frame of motor through first bearing and second bearing respectively, wherein first bearing and first bearing frame clearance fit to/or second bearing and second bearing frame interference fit. Optionally, the second bearing is a spin-on bearing. The arrangement is convenient for the assembly of the bearing, the protruding end of the output shaft is small in jumping, the sealing effect is good, and the assembly of the electronic pump is convenient.

According to an embodiment of the invention, the spring washer is mounted to the first bearing seat, and it presses against the first bearing. Preferably, the spring washer has a catch which catches on the bearing block. This arrangement facilitates a concentric arrangement between the spring washer and the bearing and facilitates assembly of the electronic pump.

According to the utility model discloses an embodiment, the end that stretches out of output shaft is flat. The flat projecting end facilitates alignment of the magnetic ring and rotor poles of the motor.

According to the utility model discloses a circuit board subassembly has the centre bore, supplies the output shaft to extend through, and the partial cover that passes this centre bore at least of output shaft has the shield sleeve. The shield sleeve may be made of plastic, whereby the circuit board assembly may be protected from static electricity of the output shaft.

According to the utility model discloses an embodiment, the pump still includes the pump cover, and it is fixed in the pump shell with the help of second fixing device. The second fixing means may be a bolt.

Other features and advantages of the present invention will be apparent from the following detailed description and the accompanying drawings.

Drawings

In the drawings, embodiments of the invention are shown in simplified form for the sake of clarity. Like reference numerals refer to like parts throughout the drawings.

The figures show:

fig. 1 is a schematic perspective view of an electronic pump of an embodiment of the present invention;

fig. 2A is a schematic cross-sectional view of an electronic pump of an embodiment of the present invention, wherein the gerotor pump is not shown;

FIG. 2B is a perspective view of the electronic pump of FIG. 2A from below;

FIG. 2C is a perspective view of the electronic pump of FIG. 2A from above;

FIG. 2D is an enlarged partial view of the electronic pump of FIG. 2A;

FIG. 3A is a perspective view of a circuit board assembly of the electronic pump of FIG. 2A from above;

FIG. 3B is a perspective view of a circuit board assembly of the electronic pump of FIG. 2A from below;

FIG. 3C is a perspective view of a circuit board assembly of the electronic pump of FIG. 2A from another angle above;

FIG. 4 is a perspective view of an end cap subassembly of the motor of the electronic pump of FIG. 2A;

FIG. 4A is a perspective view of a spring washer of the end cap subassembly of FIG. 4;

fig. 5 is an assembly schematic of the electronic pump of fig. 2A.

Detailed Description

Embodiments of the present invention are described below with reference to the drawings.

Fig. 1 shows a perspective view of an electronic pump according to an embodiment of the present invention. As shown in the drawings, the electronic pump 1 includes a motor 100, a circuit board assembly 200, and a rotor pump (gerotor)300, the circuit board assembly 200 being located between the motor 100 and the rotor pump 300. The circuit board assembly 200 is electrically connected to the motor 100 to control the operation of the motor. Circuit board assembly 200 includes a connector 210 to provide electrical signals and power to motor 100.

Fig. 1 also shows that the pump 300 includes a pump housing 310 and a pump cover 320, the pump housing 310 and the motor 100 are fixed to each other by bolts 400, and the pump cover 320 is fixed to the pump housing 310 by bolts 500.

Fig. 2A to 2D are schematic views showing the electronic pump without the pump cover 320 of the gerotor pump 300, fig. 2A being a sectional view, and fig. 2B to 2D being perspective views.

As shown in fig. 2A to 2D, the circuit board assembly 200 includes a circuit board assembly housing 270 (see fig. 3A) provided with a vent hole 220 penetrating through the outer peripheral side. As shown in fig. 2D, the vent is L-shaped with the end covered with a breathable membrane 230.

The output shaft 110 of the motor 100 extends outside the motor 100 and extends through the circuit board assembly 200 and the pump housing 310. As shown in fig. 2B, the protruding end of the output shaft 110 is flat to facilitate alignment with the magnetic ring 130 and the rotor poles of the motor 100 when assembled. Further, as shown in fig. 2A-2B, the protruding direction of the output shaft 110 is the same as the extending direction of the connector 210.

Fig. 2A also shows that the circuit board assembly 200 has a central bore 280 (see fig. 3B) through which the output shaft 100 extends, and that the portion of the output shaft passing through the central bore is sheathed by a shielding sleeve 240, which is adjacent to the magnetic ring 130 of the electric machine 100. Further, the output shaft 100 is mounted at both ends on respective bearing housings (not labeled) of the motor 100 through a bearing 120 and a bearing 330, respectively, wherein the bearing 120 is clearance-fitted with an upper bearing housing of the motor 100, and the bearing 330 is interference-fitted with a lower bearing housing of the motor 100.

The connector 210 has a connector terminal 250, and the circuit board assembly further includes a circuit board 290 and a fixing pin 260 for fixing the circuit board, and the extending direction of the connector terminal 250 and the extending direction of the fixing pin 260 are also the same.

The circuit board assembly 200 of an embodiment of the present invention is shown in detail in fig. 3A-3C. As shown in the figure, the component case 270 is provided with 4 protruding ribs 271 extending in the circumferential direction on the end face edge, and is provided with 4 semicircular arc surfaces 272 and 4 fins 273 distributed in the circumferential direction on the outer circumferential side, the semicircular arc surfaces 272 extend parallel to the longitudinal axis of the circuit board component, the fins 273 extend perpendicular to the longitudinal axis of the circuit board component, and the fins 273 are arranged on the semicircular arc surfaces 272.

The ribs 271 function to eliminate a gap between the pump housing 310 and the circuit board assembly 200 due to a height error. The function of the semi-circular arc surface 272 is to adjust the concentricity between the magnetic ring 130 of the motor 100 and the hall sensor (not labeled) on the circuit board 290. The fins 272 engage corresponding slots (not shown) on the pump housing 310 to secure the circuit board assembly 200 to the pump housing 310.

Fig. 4 shows that the bearing seat on the housing end cap 140 of the motor 100 mounts a spring washer 150 to press against the bearing 120 (see fig. 2A). Fig. 4A shows a detail of a spring washer 150 comprising a body 151 and a pawl 152 bent relative to the body, the pawl 152 being snapped onto the bearing seat. The figure shows 3 jaws. In this way, the motor housing end cap may be placed upside down when assembled and facilitate the concentric arrangement between the bearing 120 and the spring washer 150 by pressing against the bearing.

Fig. 5 shows an assembly process of the electronic pump 1. First, the pump housing and circuit board assembly are assembled together: preparing a pump shell, installing a bearing on the output shaft, then installing the bearing in the pump shell, then installing a sealing ring, fixing a circuit board assembly on the pump shell, and sleeving a shielding sleeve on the output shaft. Next, the motor is assembled: the magnetic ring and the rotor are first installed, then the bearing is installed, and then the motor housing, to which the stator has been fitted, is fixed to the pump housing. And finally, mounting pump teeth and a pump cover to complete the electronic pump.

When the motor housing is fixed to the pump housing, two pins can be used to align the two housings, then 2 bolts can be fixed, and after the pins are removed, the other 2 bolts can be fixed.

The embodiments discussed in the detailed description and illustrated in the figures are merely illustrative exemplary embodiments. For example, in the electronic pump of the embodiment, the pump is a gerotor pump (gerotor). However, the pump may be other types of pumps. In some cases, the features disclosed in the present invention may be used independently of other features. On the other hand, when necessary, the features disclosed in the present invention may be combined to provide various combinations.

List of reference numerals

1 electronic pump

100 motor

110 motor shaft

120 bearing

130 magnetic ring

140 end cap

150 spring washer

151 main body

152 jaw

200 circuit board assembly

210 connector

220 air vent

230 breathable film

240 shield sleeve

250 connector terminal

260 fixed pin

270 assembly housing

271 Rib

272 semi-circular arc surface

273 fin

280 center hole

290 circuit board

300 rotor pump

310 pump casing

320 pump cover

330 bearing

400 bolt

500 bolt

Claims (18)

1. A circuit board assembly for an electronic pump, characterized in that the circuit board assembly comprises a circuit board assembly housing, the outer periphery of which is provided with a through vent hole, and the vent hole is covered with a breathable membrane at the tail end.

2. The circuit board assembly of claim 1, wherein the vent hole extends along an L-shaped path.

3. A circuit board assembly according to claim 1 or 2, characterised in that the circuit board assembly housing is provided with a circumferentially extending rib on the end face edge.

4. A circuit board assembly according to claim 1 or 2, wherein the circuit board assembly housing is provided with a circumferentially distributed semi-circular arc surface on the outer circumferential side.

5. The circuit board assembly of claim 4, wherein the semi-circular arc surface extends parallel to a longitudinal axis of the circuit board assembly.

6. A circuit board assembly according to claim 1 or 2, characterized in that the circuit board assembly housing is provided with circumferentially distributed fins on the outer circumferential side.

7. The circuit board assembly of claim 6, wherein the fins extend perpendicular to a longitudinal axis of the circuit board assembly.

8. An electronic pump, characterized in that it comprises a circuit board assembly according to any one of claims 1-7.

9. The electronic pump of claim 8, further comprising a motor, the motor including an output shaft, the circuit board assembly including a connector, wherein the output shaft extends out of the motor, and wherein the output shaft extends in the same direction as the connector.

10. The electronic pump of claim 9, wherein the connector has a connector terminal, the circuit board assembly further includes a circuit board and a fixing pin fixing the circuit board, and the connector terminal extends in the same direction as the fixing pin.

11. The electronic pump of claim 9, further comprising a pump, wherein the circuit board assembly is positioned between the motor and the pump.

12. The electronic pump of claim 11, wherein the motor and the pump each comprise a motor housing and a pump housing, the motor housing and the pump housing being secured to one another by a first securing means.

13. The electronic pump of claim 11, wherein the output shaft is mounted on respective first and second bearing housings of the motor by first and second bearings, respectively, wherein the first bearing is a clearance fit with the first bearing housing and/or the second bearing is an interference fit with the second bearing housing.

14. The electronic pump of claim 13, wherein the first bearing mount mounts a spring washer that presses against the first bearing.

15. The electronic pump of claim 14, wherein the spring washer has a detent that snaps over the bearing seat.

16. Electronic pump according to any of claims 9-15, characterized in that the protruding end of the output shaft is flat.

17. The electronic pump of any of claims 9-15, wherein the circuit board assembly has a central bore through which the output shaft extends, at least a portion of the output shaft extending through the central bore being sheathed with a shielding sleeve.

18. The electronic pump of claim 12, wherein the pump further comprises a pump cover secured to the pump housing by a second securing means.

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