WO2019141443A1

WO2019141443A1 - Fluid machine

Info

Publication number: WO2019141443A1
Application number: PCT/EP2018/084340
Authority: WO
Inventors: Tilo SCHÄFER; Bernd Denfeld; Terry THORNTON
Original assignee: Magna Powertrain Bad Homburg GmbH
Priority date: 2018-01-16
Filing date: 2018-12-11
Publication date: 2019-07-25
Also published as: DE102018200645B3

Abstract

The invention relates to a fluid machine (1) having a housing body (3) which comprises an electronic device (16), such as a circuit board, which is embedded in a duroplastic material (13) and has a diagnostic region (24). To improve the fluid machine, in particular in terms of its functionality and/or ease of production, the housing body (3) comprises, in the diagnostic region (24), a diagnostic access point (20), which is closed by a closure element, wherein the closure element (30) can be removed to connect a diagnostic connector (40) to diagnostic points within the diagnostic region (24) via the diagnostic access point (20).

Description

Fluidic machine

The invention relates to a fluidic machine having a housing body, which comprises an electronic device embedded in a duroplastic plastic material, such as a printed circuit board, with a diagnosis area. The invention also relates to a method for producing a housing body for such a fluidic machine. The invention further relates to a tool for producing a housing body for such a fluidic machine.

International Publication WO 2017/054994 A1 discloses a control device comprising a processing device with an electrical connection; a diagnostic circuit electrically connected to the terminal; and an enclosure that completely electrically isolates the terminal, wherein the diagnostic circuit includes an electrical interface and is configured to sense an electrical signal at the terminal and provide the result via the interface, the shell being configured in the region of the interface thereto to be selectively removed. European Patent Application EP 0 986 11 1 A2 discloses a method for producing an electronic component which has electronic components which are arranged in a plastic housing, in particular a Hall sensor, wherein the electronic components are arranged in a hotmelt adhesive composition and subsequently to the Formation of the plastic housing are over-molded. International Publication WO 2006/029944 A1 discloses a method for closing assembly openings of device housings with foil covers, in which a coherent flat material is presented, from which a plurality of foil covers are formed and attached to the respective device housing via its mounting opening. German laid-open specification DE 31 16 519 A1 discloses a laminated material for sealing electrical housings, comprising a composite of rubber-elastic layers with rigid carrier materials, the layers being constructed from laminates of thermosets and / or thermoplastics with metal foils.

WO 2016/087 056 A1 discloses a fluidic machine with a housing body, which comprises an electronic device with a diagnosis area, wherein the housing body has a diagnostic access in the diagnosis area, which is closed by a closure body.

l The object of the invention is to provide a fluidic machine with a housing body which comprises an electronic device embedded in a thermosetting plastic material, such as a printed circuit board, with a diagnosis area, in particular with regard to its functionality and / or with regard to its manufacturability improve.

The object is achieved in a fluidic machine with a housing body, which includes an embedded in a thermosetting plastic material electronic device, such as a printed circuit board, with a diagnostic area, achieved in that the housing body in the diagnostic area comprises a diagnostic access, by a closure body is closed. The fluidic machine is preferably a hydraulic fluid machine or pump that is electrically driven. The electrically driven pump is designed for example as a side channel pump. The fluidic machine is used, for example, as a water pump or oil pump in the automotive sector. The electronic device is preferably a printed circuit board via which, for example, stator currents are passed on to stator windings in the housing body by an electrical connection device provided on the outside of the pump. By means of the printed circuit board, it is also possible, for example, to commutate currents which serve to generate an electromagnetic rotary field with the aid of which a rotor is set in rotation in the housing body. The duroplastic plastic material is, for example, an epoxy resin with which the circuit board is encapsulated in an injection molding process. The printed circuit board is preferably completely encapsulated with the duroplastic plastic material.

The surrounding the circuit board thermoset plastic material has stood in the cured to advantageous a uniform thickness of a few millimeters. For example, a diagnostic connector can be connected to diagnosis points in the diagnostic area via the diagnostic access. Using the diagnostic connector, errors in the operation of the pump, in particular during operation of the printed circuit board, can then be determined via the diagnosis points.

A preferred embodiment of the fluidic machine is characterized in that the closure body of a liquid impermeable, but permeable to gas, in particular water vapor permeable material is formed, which prevents unwanted liquid entry. The breathable material is, for example, a Gore-Tex material. The words Gore-Tex are trademarks protected trade marks. The closure body is embodied, for example, as a sealing plug and preferably detachable, that is to say repeatedly separable non-destructively, connected to the duroplastic material surrounding the diagnostic access. The releasable connection is embodied, for example, as a material-locking connection, preferably as an adhesive connection. A further preferred embodiment of the fluidic machine is characterized in that the diagnostic access is arranged at a readily accessible from the outside of the fluidic machine. This considerably simplifies the attachment of the diagnostic connector for diagnostic purposes.

A further preferred exemplary embodiment of the fluidic machine is characterized in that the diagnostic access comprises a diagnostic recess which eliminates the diagnostic area in the thermosetting plastic material. Depending on the design, the fluidic machine may also include more than one diagnostic access. The diagnostic recess is advantageously so large that advantageously all diagnostic points in the diagnostic area can be contacted with a diagnostic plug inserted into the diagnostic recess.

Another preferred exemplary embodiment of the fluidic machine is characterized in that the diagnostic area in the diagnostic recess is provided with a protective layer of the thermosetting plastic material, which has a significantly smaller thickness than the duroplastic material outside the diagnostic recess. As a result, undesired ingress of liquid during operation of the pump into the diagnostic area is prevented in a simple manner. Due to the small thickness of the protective layer, which is preferably only a few tenths of a millimeter, a penetration of the protective layer with needles is provided in a simple manner, which are provided on the diagnostic connector for the sem purpose.

Another preferred embodiment of the fluidic machine is characterized in that the shape of the diagnostic recess is adapted to the shape of a diagnostic connector. This simplifies the insertion and holding of the diagnostic connector in the diagnosis recess.

Another preferred embodiment of the fluidic machine is characterized in that the fluidic machine comprises a stator with stator windings embedded in the thermosetting plastic material. The stator windings belong to a stator which, for example, comprises a laminated stator core, which is likewise embedded in the thermosetting plastic material. The printed circuit board is preferably embedded together with the stator in an injection process in the thermosetting plastic material. As a result, a stable, multifunctional housing body for the fluidic cal machine is created in a simple manner. In a method for producing a housing body for a previously described fluidic machine, the above-stated object is alternatively or additionally achieved by omitting the diagnosis area in the case of encapsulation of the electronic device in order to represent the diagnostic access. This provides the advantage that a subsequent processing of the housing body can be omitted.

In a tool for producing a housing body for a previously described fluidic machine, in particular according to a previously described method, the above-mentioned object is alternatively or additionally achieved in that the tool comprises a stamp which is arranged in the diagnosis area in order to fix the To spare the diagnostic area during encapsulation of the electronic device. In this case, the diagnostic area, in particular one or the diagnosis recess, can be omitted completely or partially. If the diagnostic area is completely recessed by the stamp during encapsulation with the thermosetting plastic material, then the diagnostic points are exposed in the diagnostic area after the injection process in the housing body. If the diagnostic area is only partially recessed with the stamp, then a protective layer is formed during the overmolding with the thermosetting plastic material, which seals the diagnostic area from the surroundings.

The invention further relates to a closure body and / or a diagnostic connector for a previously described fluidic machine. The closure body and the diagnostic connector can be traded separately.

Where appropriate, the invention also relates to a diagnostic method for testing a previously described fluidic machine. In order to diagnose the fluidic machine, in particular the printed circuit board, one or the diagnostic connector is arranged in the diagnostic area, in particular the diagnostic recess, such that needles advantageously provided on the diagnostic connector come into contact with the diagnosis points in the diagnosis area.

If appropriate, the invention also relates to an electronic device, in particular a printed circuit board, with a plastic encapsulation which has a diagnostic access described above.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawing, various embodiments are described in detail. Show it: 1 shows a fluidic machine with a housing body, which includes a material embedded in a thermosetting plastic material circuit board having a diagnostic area in which a diagnostic connector is arranged, in longitudinal section;

FIG. 2 shows the fluidic machine from FIG. 1 in a plan view of the diagnostic area without a diagnostic plug; and

FIG. 3 shows the same plan view as in FIG. 2 with a closure body in the diagnostic area.

1 shows a fluidic machine 1 with a housing 2 is shown in section. In the fluidic machine 1 is a hydraulic pump, which is designed for example as a side channel pump. The housing 2 of the fluidic machine 1 comprises a housing body 3 with a stator 5.

The stator 5 comprises a laminated stator core 6 having a multiplicity of stator laminations, which are not described in more detail, and windings, likewise not designated in more detail, which are arranged on at least one winding carrier 7, 8. The windings comprise winding heads 9, 10,

11, 12, which are arranged outside of the stator lamination stack 6.

The laminated stator core 6 with the windings, the winding carriers 7, 8 and the winding heads 9 to 12 is encapsulated with a thermosetting plastic material 13 in order to depict the stator 5. The stator 5 includes radially inwardly a receiving space 14 for a magnetically active part of a (not shown) rotor.

The rotor and the stator 5 represent an electromotive drive for the fluidic machine 1. In the housing body 3 of the housing 2, a receiving space 15 for a hydraulically effective part of the rotor is provided. The hydraulically effective part of the rotor comprises, for example, an impeller which is non-rotatably connected to the magnetically active part of the rotor.

In addition, the stator 5 comprises an electronic device 16, which is embodied, for example, as a printed circuit board or printed circuit board and which is likewise encapsulated with the plastic material 13. The electronic device 16 in turn is equipped with electronic components 17, such as coils or capacitors. In addition, the stator 5 comprises an electrical connection device 18. The electronic components 17 are encapsulated with the plastic material 13. The Electrical connection device 18 is, at least partially, accessible outside of the stator 5 in order to connect an electrical line to the stator 5.

The fluidic machine 1 is, for example, a water pump or an oil pump that is installed in a motor vehicle. After installation of the pump in the motor vehicle, a suitable electrical connector is connected to the electrical connection device 18. In operation of the pump 1, a rotor (not shown in FIG. 1) rotates in the stator 5 to convey a liquid such as water or oil. In case of malfunction, the pump 1 can be removed and examined in a laboratory.

For diagnostic purposes, the pump 1 is equipped with a diagnostic access 20 in addition to the electrical connection device 18. In FIG. 1, a diagnostic connector 40 is arranged in the diagnostic access 20. Diagnostic points can be contacted with the diagnostic connector 40 in a diagnostic area 24 of the electronic device 16 designed as a printed circuit board.

In FIGS. 2 and 3, it can be seen that the diagnostic access 20 comprises a diagnostic recess 25 in the thermosetting plastics material 13. As can be seen in FIG. 2, the diagnostic recess 25 surrounds four diagnostic points in the diagnostic area 24. The shape of the diagnostic recess 25 is adapted to the shape of the diagnostic plug (40 in FIG. 1).

In FIG. 3, the diagnostic recess 25, which represents the diagnostic access 20, is closed by a closure body 30. The closure body 30 is formed of a Gore-Tex material. This reliably prevents a simple manner in the operation of the pump 1 liquid in the diagnostic area 24 with the diagnostic points on the circuit board 16 passes.

This prevents, for example, unwanted corrosion of the printed circuit board 16 in the diagnostic area 24. At the same time, the non-absolutely liquid-tight material from which the closure body 30 is formed allows passage of gas, such as water vapor. For example, liquid, such as water, which may or may not be present in an undesirable manner in the area of the printed circuit board 16, can escape into the environment in the form of gas, in particular in the form of water vapor. The printed circuit board 16 and the stator 5 are completely encapsulated with the plastic material 13. The plastic material 13 surrounding the printed circuit board 16 and the stator 5 has, for example, a thickness of a few millimeters. The diagnostic area 24 was intentionally recessed from the plastic material 13 during encapsulation.

For this purpose, when injecting the plastic material 13 into a suitable injection molding tool, the diagnostic area 24 is filled, preferably with a corresponding stamp. In this case, the stamp can come into contact with the diagnostic area 24. However, the stamp can also be arranged during injection at a small distance from the diagnostic area 24, so that a protective layer of the plastic material 13 results via the diagnostic area 24.

LIST OF REFERENCES

Fluidic machine

casing

housing body

stator

stator lamination

winding support

winding head

Plastic material

accommodation space

Electronic device

Electronic component

Electrical connection device

diagnostic access

diagnostic area

Diagnoseausnehmung

closure body

diagnostic connector

Claims

claims

A fluidic machine (1) comprising a housing body (3) comprising an electronic device (16) embedded in a thermosetting plastic material (13), such as a printed circuit board, having a diagnostic area (24), characterized in that Housing body (3) in the diagnostic area (24) comprises a diagnostic access (20) which is closed by a closure body (30), wherein the closure body (30) can be removed to the diagnosis access (20) a diagnostic connector (40 ) to connect to diagnostic points in the diagnostic area (24).

2. A fluidic machine according to claim 1, characterized in that the closure body (30) is formed of a liquid-impermeable, but gas-permeable, in particular water vapor-permeable, material which prevents undesired liquid entry.

3. Fluidic machine according to one of the preceding claims, characterized in that the diagnostic access (20) is arranged at a readily accessible from the outside of the fluidic machine (1).

4. A fluidic machine according to one of the preceding claims, characterized in that the diagnostic access (20) comprises a diagnostic recess (25) which eliminates the diagnostic area (24) in the thermosetting plastic material (13).

5. A fluidic machine according to claim 4, characterized in that the diagnostic area (24) in the diagnostic recess (25) is provided with a protective layer of the duroplastic plastic material (13), which has a significantly smaller thickness than the thermosetting plastic material ( 13) outside the diagnostic recess (25).

6. A fluidic machine according to claim 4 or 5, characterized in that the shape of the diagnostic recess (25) is adapted to the shape of the diagnostic connector (40).

7. Fluidic machine according to one of the preceding claims, characterized in that the fluidic machine (1) comprises a stator (5) with stator windings, which are embedded in the thermosetting plastic material (13).

8. A method for producing a housing body (3) for a fluidic machine (1) according to any one of the preceding claims, characterized in that the diagnostic nose area (24) is omitted in an encapsulation of the electronic device (16) to represent the diagnostic access (20).

9. Tool for producing a housing body (3) for a fluidic machine (1) according to one of claims 1 to 7, in particular according to a method according to claim 8, characterized in that the tool comprises a stamp which in the diagnostic area ( 24) is arranged in order to save the diagnosis area (24) during the encapsulation of the electronic device (16).

10. Closure body (30) and / or diagnostic connector (40) for a fluidic machine (1) according to one of claims 1 to 7.