CN116981849A

CN116981849A - Pump with electronic device housing and cooling body

Info

Publication number: CN116981849A
Application number: CN202280016171.6A
Authority: CN
Inventors: D·克里尔; A·克
Original assignee: KSB SE and Co KGaA
Current assignee: KSB SE and Co KGaA
Priority date: 2021-02-22
Filing date: 2022-02-21
Publication date: 2023-10-31
Also published as: WO2022175520A1; DE102021000933A1; EP4295050A1

Abstract

The invention relates to a pump comprising a drive motor, at least one electronics housing and at least one thermally conductive cooling body for removing heat from the electronics housing, wherein an intermediate piece for thermally decoupling the cooling body from the motor housing is inserted between the cooling body and the motor housing, and wherein the intermediate piece has at least one passage opening for at least one component to pass through between the motor housing and the cooling body, characterized in that the intermediate piece is made of a resilient material and in that the intermediate piece is geometrically pressed in the region surrounding the at least one passage opening in order to seal the region of the passage opening from the surroundings.

Description

Pump with electronic device housing and cooling body

The invention relates to a pump comprising a drive motor, at least one electronics housing and at least one cooling body for removing heat from the electronics housing, wherein an intermediate piece for thermally decoupling the cooling body from the motor housing is introduced between the cooling body and the motor housing, and wherein the intermediate piece has at least one through-opening for passing at least one component between the motor housing and the cooling body.

Pumps are made up of different components that generate waste heat independently of each other during operation of the pump. As a pump drive, an electric motor is often used, the waste heat of which is produced during operation being dissipated via the motor housing. For controlling/regulating the pump or the motor, control electronics, in particular a frequency converter, are provided, which are arranged in a separate electronics housing. The electronics housing is mounted on the motor housing in the sense of a compact pump structure. In order to reduce the thermal load on each other, the two housings, i.e. the motor housing and the electronics housing, must be thermally decoupled from each other. The latter is usually equipped with its own cooling body in order to optimize the heat removal.

For the necessary thermal decoupling, in the past, an intermediate piece has been inserted between the cooling body of the electronics housing and the motor housing. The intermediate piece is, for example, a plastic part, which separates the facing sides of the cooling body and of the motor housing from one another.

Since connecting wires are required between the electronics of the pump and the electric motor in order to connect the stator to the power electronics of the frequency converter, for example, the intermediate piece, the electronics housing with the cooling body and the motor housing must have openings for providing lead-through openings for connecting wires. The entry of splashes through these lead-through openings must be prevented, and these openings must therefore be sealed from the surroundings by separate measures. In the past, the sealing lips were either injection molded directly into the region of the intermediate piece, or a separate sealing element, for example an O-ring, was used. However, this solution increases the assembly costs and the manufacturing costs of the pump.

The object of the invention is to simplify the previous handling and to achieve an improved sealing in the region of the lead-through opening of the intermediate piece.

This object is achieved by a pump according to the features of claim 1. Advantageous embodiments of the pump are the subject matter of the dependent claims.

According to the invention, it is proposed that the intermediate piece which is inserted between the motor housing and the cooling body is made of a resilient material. The elasticity of the intermediate piece allows it to be compressed in a defined manner in the region of the lead-through opening, which is achieved by a specific geometry of the cooling body, of the motor housing and/or of the intermediate piece, i.e. by a suitable shaping. The shaping of the pressing edge on the cooling body and/or motor housing or the increase in the material thickness of the intermediate piece in the region of its passage opening causes an increased compression of the intermediate piece around its passage opening when the pump is assembled. The surface section of the intermediate piece, which is pressed more strongly there, increases the tightness in this region around the insertion opening in a targeted manner, so that adequate water-repellent properties are ensured and water is prevented from entering the electronics housing and/or the motor housing from the outside via the insertion opening. Instead of injection molding of individual seals or sealing elements, a significantly simpler construction is achieved in this way, with a concomitant saving in production costs.

Advantageously, the cooling body of the motor housing and/or the electronics housing is provided with a shaped projection in the region of the insertion opening of the intermediate piece in the region of its mutual contact surfaces. Such a profiled projection serves for a geometrically defined compression (vercompression) of the intermediate piece in the region of abutment. The bulge-like shaped projections on the contact surface of the motor housing and/or the cooling body are advantageous. It is also advantageous if such a shaped projection extends around the opening of the motor housing and/or the cooling body. The opening of the motor housing and/or the cooling body in combination with the threading opening of the intermediate piece serve to thread the at least one component between the motor housing and the cooling body.

The intermediate piece is advantageously made of a thermally insulating material, so that thermal decoupling between the two components, i.e. the motor housing and the cooling body or the electronics housing, is achieved. Furthermore, it may be particularly important that the material for the intermediate piece is additionally made of a non-conductive material. Typically, the cooling body and/or the motor housing are made of an electrically conductive material, such as a metal, in particular aluminum. In passing the electrical element through a corresponding opening in the motor housing or cooling body, electrical insulation is obviously important, which is achieved in addition by a minimum distance between the conductor and the opening wall. The intermediate piece made of electrically insulating material can be used to additionally insulate the pass-through region with respect to the routed wire. For this purpose, it is advantageous if the intermediate part has a skirt extending from the surface of the intermediate part in the region of the passage opening, which skirt preferably protrudes into the adjoining opening of the cooling body and/or of the motor housing. The skirt thus acts as an insulating sheath extending around the led-through electrical conductors. It is particularly preferred that the apron engages precisely against the opening wall of the cooling body and/or motor housing, i.e. the opening periphery of the cooling body and/or motor housing is ideally completely lined.

There are viable solutions that are: the electronics housing or the cooling body arranged therein is arranged on the circumferential side to the motor housing and, alternatively or additionally, to the axial end of the motor housing. In this case, it is preferable if the intermediate piece is arranged at the axial end of the motor housing, i.e. at the end face there, which is in turn connected to the cooling body. It can be provided here that the contact surface of the cooling body with the intermediate piece is formed mainly by rib-shaped cooling ribs.

The pump can be any pump type with an integrated electronic control mechanism. The pump is preferably designed as a centrifugal pump, particularly preferably as a heating circulation pump, which is operated by an integrated control unit, preferably in a rotational speed-regulated manner.

Further advantages and characteristics of the invention are explained in detail below with the aid of embodiments shown in the drawings. Wherein:

figure 1 shows a cross-section along the motor axis of the pump in the axial direction,

fig. 2 shows a detail view of the contact area between the motor housing and the cooling body and the intermediate piece interposed therebetween; and is also provided with

Fig. 3 shows a top view of the axial end side of the motor housing.

Fig. 1 shows a section through the entire pump assembly 1 along its pump axis. The entire structure comprises a hydraulic part 1 with a pump impeller 1a, which is here embodied as a centrifugal pump, in particular as a heating circulation pump. The impeller 1a is connected to a rotor 6 of the electric motor 2 via a pump shaft 1b.

The electric motor 2 composed of the rotor 6 and the stator 5 is supported inside a motor housing 2a, and the motor housing 2a is directly adjacent to the pump housing 1c in the axial direction. On the axial end of the motor housing 2a facing away from the pump 1, a cooling body 4 is adjoined, which serves to dissipate heat from the electronics housing 3. The cooling body 4 is provided with individual rib-like cooling fins 4a extending from a cooling body base plate 4b in the direction of the axial end of the motor housing 2. The cooling body substrate is directly connected to the electronics housing 3 or is an integral part of the electronics housing 3.

The electric connection of the electric motor 2 to the pump electronics, for example the power electronics of a frequency converter, takes place via one or more stator plugs 7, which can be accessed via openings 2b (see fig. 3) in the axial end face of the motor housing 2, which faces the electronics housing. The electronics housing 3 encloses corresponding bores 8 in the cooling body base plate 4b, which bores are aligned with the openings 2a of the motor housing in the fully assembled pump. The electrical connection leads (not shown here) can thus be led from the electronics housing 3 all the way through the cooling body 4 and the wall of the motor housing 2a to the stator plug 7. In addition to the openings for the stator connections, further openings for further connections can also be provided in the motor housing 2a and the cooling body base plate 4 b.

Both the motor housing 2a and the cooling body 4 are made of aluminum and are thus both thermally conductive and electrically conductive. During pump operation, waste heat is generated not only by the electric motor 2 but also by the electronics in the electronics housing 3, which waste heat must be conducted out into the external environment.

In order to avoid thermal influences of the electronics and the electric motor 2 on each other, thermal decoupling is to be achieved between the electronics housing 3 and the motor housing 2a by: an intermediate member 10 is interposed between the cooling body 4 and an axial end surface of the motor housing 2a facing the electronic device housing 3. The intermediate piece 10 is made of rubber and therefore has a significantly smaller heat conductivity than the motor housing 2a or the cooling body 4. Through the intermediate piece, a direct contact of the cooling body 4 and the motor housing 2a and thus a thermal decoupling is achieved. In order to pass through electrical and other connecting lines between the electronics housing 3 and the motor housing 2a, corresponding pass-through openings 10a have to be provided in the intermediate piece 10.

The requirements placed on the pump, in particular the heating circulation pump, are splash protection requirements, for example according to IP 44. In order to achieve this, the previously mentioned region through which the wire is routed must also be protected. In order to provide an additional seal in the region of the lead-through, a more intense compression 12 of the elastic material of the intermediate piece 10 is specifically produced in the region surrounding the lead-through opening 10a. By such a reinforced material compression 12 in the area surrounding the lead-through opening 10a, the lead-through opening can be better sealed outwards and splash water is effectively prevented from entering the electronics housing and/or motor housing. In particular, this solution can be used without additional insertion of a separate sealing element.

The contact 12 is achieved by a special geometric shaping of the surface that contacts the intermediate piece 10 in the region of the insertion opening 10a. In the embodiment presented here, the end side of the motor housing 2a shows a profiled bead 2c extending around the edge of the opening 2a in the entire circumferential direction, which bead bulges in the direction of the intermediate piece 10. Thus, during assembly of the pump, the pressure exerted by the motor housing 2a on the inserted intermediate piece 10 around the lead-through opening 10a is increased, which results in the desired compression in the edge region of the intermediate piece 10 around its lead-through opening 10a. The use of additional O-rings or injection molding of the sealing lip can be dispensed with, so that the overall construction according to the invention is less costly.

The intermediate piece 10 can additionally have a skirt 11a, 11b which extends around the through opening 10a and extends perpendicularly from the upper side and/or the lower side of the intermediate piece 10. These skirts 11a, 11b project into the bore 8 of the cooling body 4 and into the opening 2a of the motor housing 2, and line the respective opening wall over the entire circumference thereof. The electrical insulation properties of the intermediate piece material serve as an additional protection, that is to say the insulation of the stator connection lines in the region of the bores 2a, 8 from the metallic motor housing wall or cooling body wall. Thereby avoiding possible electrical flashovers from the conductive stator connection to the housing wall.

Claims

1. Pump comprising a drive motor, at least one electronics housing (3) and at least one cooling body (4), the cooling body (4) being used for removing heat from the electronics housing (3), wherein an intermediate piece (10) for thermally decoupling the cooling body (4) from the motor housing (2 a) is inserted between the cooling body (4) and the motor housing (2 a) of the drive motor (2), and wherein the intermediate piece (10) has at least one through-opening (10 a) for guiding at least one component through between the motor housing (2 a) and the cooling body (4),

it is characterized in that the method comprises the steps of,

the intermediate piece (10) is made of a resilient material, and the intermediate piece (10) is geometrically compressed in the region surrounding the at least one lead-through opening (10 a) in order to seal the region of the lead-through opening (10 a) from the surrounding environment.

2. Pump according to claim 1, characterized in that the contact surface of the motor housing (2 a) and/or of the cooling body (4) has a shaped projection (2 c), in particular a bulge-like shaped projection (2 c), in the region of the lead-through opening (10 a) of the intermediate piece (10) in order to produce a geometrically defined compression (12) of the intermediate piece (10) in the region of the lead-through opening (10 a).

3. Pump according to claim 2, characterized in that the profiled projection (2 c) extends annularly around the opening (2 b, 8) of the motor housing (2 a) and/or the cooling body (4) adjoining the lead-through opening (10 a) of the intermediate piece (10).

4. Pump according to any one of the preceding claims, characterized in that the intermediate piece (10) is made of an electrically and/or thermally insulating material.

5. Pump according to any one of the preceding claims, characterized in that the intermediate piece (10) is made of rubber.

6. Pump according to any of the preceding claims, characterized in that the intermediate piece (10) has at least one apron (11 a, 11 b) extending from the surface in the region of the lead-through opening (10 a), which apron projects into the opening (8, 2 b) of the cooling body (4) and/or of the motor housing (2 a) adjoining the lead-through opening (10 a).

7. Pump according to claim 6, characterized in that the apron (11 a, 11 b) fits precisely against the opening wall of the cooling body (4) and/or motor housing (2 a), in particular lining the periphery of the opening (8, 2 b) of the cooling body (4) and/or motor housing (2 a).

8. Pump according to any of the preceding claims, characterized in that openings (10 a, 2b, 8) in the intermediate piece (10), motor housing (2 a) and cooling body (4) are used for threading to at least one electrical connection line (7), in particular for threading an electrical connection between stator and pump electronics.

9. Pump according to any of the preceding claims, characterized in that the cooling body (4) and the motor housing (2 a) are made of metal, in particular aluminum.

10. Pump according to any of the preceding claims, characterized in that the intermediate piece (10) is fitted between the axial end side of the motor housing (2 a) and the cooling body (4) and/or that the contact side of the cooling body (4) facing the intermediate piece (10) is provided with rib-like cooling fins (4 a), the free ends of which are in contact with the intermediate piece (10).

11. Pump according to any of the preceding claims, characterized in that the pump is a centrifugal pump, in particular a heating circulation pump.