Electrical connector socket for an electric air conditioning compressor

Abstract

The invention relates to an electrical connector socket, specifically an electrical high-voltage connector socket, for supplying electrical power to an electric air conditioning compressor, specifically an electric air conditioning compressor of a vehicle, comprising a tubular socket housing (1) designed for mounting on an air conditioning compressor housing, in which a contact carrier (4) with electrical vias, an electromagnetic shielding element (EMA element) (6) and an element for transferring the electromagnetic shielding (EMA transfer element) (7) to the electric air conditioning compressor are accommodated on a mounting side (9), wherein the EMA element (6) and the EMA transfer element (7) are made of an electromagnetic radiation (EMS) shielding plastic and are embedded in the tubular socket housing (1) together with the contact carrier (4) and a sealing material (12) introduced from the mounting side (9).

Description

The invention relates to an electrical plug socket, in particular an electrical high-voltage plug socket, for the electrical power supply of an electrical air conditioning compressor, in particular of an electrical vehicle air conditioning compressor.An electric air conditioning compressor is a component in air conditioning systems, in particular in vehicle air conditioning systems, which is responsible for the circulation and the pressure build-up of the refrigerant. In contrast to conventional air conditioning compressors that are mechanically driven by the internal combustion engine of the vehicle, an electric air conditioning compressor is operated by an electric motor. Electric compressors enable more precise control, which enables more efficient and comfortable climate control in the vehicle interior. This technology is increasingly being used in electric vehicles to optimize power consumption and improve comfort.Electric air conditioning compressors generate electromagnetic fields that may interfere with other electronic systems in the vehicle. Shielded lines help minimize these disturbances by shielding the electromagnetic fields generated by the electrical connection lines and preventing them from spreading to other sensitive electronic components. For this reason, electrical connecting lines for the electrical connection and supply of an electric air conditioning compressor have an electromagnetic shield which is electrically connected to the electric air conditioning compressor. The shielded electrical connection lines in electric air conditioning compressors help improve the electromagnetic compatibility of the vehicle, minimize disturbances, and ensure the reliability and safety of the electronic systems.In order to ensure simple assembly and disassembly of electrical connecting lines on electric air-conditioning compressors, electrical plug connectors or electrical plug connections consisting of plug and socket are required. The mounting of the electrical sockets requires housing openings, whereby a risk of leakage is increased. For this reason, plug sockets of electric air conditioning compressors must be fluid-tight and must additionally meet the requirements with respect to sufficient electromagnetic shielding.Up to now, the requirements with regard to electromagnetic shielding and the required fluid tightness have been fulfilled by separate components on the air conditioning compressor housing. This causes an increased installation space requirement and requires larger functional areas on the air conditioning compressor, which overall leads to higher costs. It is also disadvantageous that additional openings in the air conditioning compressor housing increase the risk of leaks and corrosion.The object of the invention is thus to propose an electromagnetically shielded plug socket for an electrical connecting line for the electrical power supply of an electric air-conditioning compressor, which is suitable for reducing the risk of fluids leaking out of the air-conditioning compressor housing via the plug socket.The object is achieved by an electrical plug socket having the features according to claim 1. Further developments are specified in the dependent patent claims.The core of the invention is an electrical plug socket, especially an electrical high-voltage plug socket, for the electrical power supply of an electrical air conditioning compressor, especially an electrical air conditioning compressor of a vehicle. The electrical plug socket, which can also be referred to as a plug socket for short below for the sake of simplicity, is provided for mounting on an opening of an air-conditioning compressor housing and thus forms a plug receptacle on an outer side for plugging in a plug on an outer side of the air-conditioning compressor housing in order to produce a supply with electrical energy. The plug socket has a tubular socket housing which is designed for fastening to an air conditioning compressor housing. The socket housing can be formed from various materials, such as plastic or aluminum. The socket housing accommodates a contact carrier with electrical vias, an electromagnetic shielding element (EMA element) and an electromagnetic shielding transfer element (EMA transfer element) inserted into the electric air conditioning compressor on an assembly side. For simplicity, the electromagnetic shielding member will be referred to as an EMA element hereinafter. Analogously, the element for transferring the electromagnetic shielding is referred to below as an EMA transfer element.The mounting side of the socket housing is located on an inner side opposite the outer side of the socket, which inner side faces the air conditioning compressor housing inner side. According to the invention, the EMA element and the EMA transfer element are formed from a plastic that shields electromagnetic radiation (EMS) and are embedded together with the contact carrier in the socket housing with a sealing material introduced from the mounting side. The sealing material is introduced in such a way that the inner cross section of the tubular bushing housing is completely filled. Between the EMA element and the EMA transfer element and the inner side of the plug socket, a sealing gap can be formed, which is filled with the sealing material. Likewise, a sealing gap can be formed between the contact carrier and the EMA element accommodating it, which is filled with the sealing material.The contact carrier can have further electrical vias with electrical contact elements formed on both sides, for example for data or signal transmission. The plug socket can thus be formed with multiple poles.The EMS shielding plastic is formulated or coated to block or attenuate electromagnetic radiation. The use of the EMS-shielding plastic ensures the electromagnetic compatibility (EMC) of the plug socket and of the plug connection produced therewith. Due to its EMC property, the EMC-shielding plastic can also be referred to as EMC plastic.According to an advantageous embodiment, the tubular socket housing has at least one stop edge running around the inner circumference, wherein the EMA element, the EMA transfer element and / or the contact carrier are accommodated with an end face in the cylindrical socket housing so as to stop. In the simplest case, the encircling stop edge is formed by an opening cross section which is reduced on the outer side of the plug socket, with the result that the contact carrier, the EMA element and the EMA transfer element can be inserted into the socket housing from the mounting side through a larger opening cross section. The contact carrier, the EMA element and the EMA transfer element can be designed such that they can be inserted into one another in such a way that they are blocked in the direction of the outer side and can be pulled apart in the direction of the inner side. The end stop in the socket housing facilitates the assembly of the elements and blocks a movement of the elements in the direction of the outside. In addition, due to the end-face stop in the interior of the socket housing, a sealing effect towards the outside can be improved.The contact carrier has electrical plated-through holes, which can be formed on the outside as contact sleeves for receiving electrical plug pins of a plug. Alternatively, other shapes of the electrical contact elements of the electrical vias are also possible. Thus, the electrical contact elements of the electrical plated-through holes facing the outer side can be designed as flat plugs or contact blades (blades). The contact carrier is preferably an injection-molded part, wherein the plated-through holes are encapsulated by the material of the contact carrier as electrically conductive insert elements.As sealing material, an electrically insulating potting compound, specifically an epoxy resin, can be introduced into the socket housing in order to embed the EMA element and the EMA transfer element in the socket housing in a fluid-tight manner. Epoxy resin as sealing material permits electrical insulation and at the same time is resistant to moisture, high temperatures and various chemicals. Epoxy resin is advantageous in particular because of its good adhesion, so that a permanent fluid-tight seal of the plug socket can be ensured. Depending on the formulation of the epoxy resin, its elasticity after application can advantageously affect the vibration robustness of the plug socket. A further advantage of using epoxy resin is its flowability, so that undercuts and small regions and sealing gaps can be filled with small volumes.The EMA element and the EMA transfer element can be formed from special EMS-shielding plastics. For example, conductive EMC plastics can be used. These contain conductive fillers, such as carbon fibers, graphite or metallic particles, in order to enable electromagnetic shielding. Examples include polycarbonate (PC) with carbon fibers or polypropylene (PP) with metallic particles. A further possibility for EMC plastics is metalised plastics. In the case of metallized plastics, the electrical conductivity is achieved by a metal coating. This can be done by methods such as vacuum metallization or electroplating. Examples include metallized polyamide (PA) or metallized polyethylene (PE). Furthermore, the EMA element and the EMA transfer element can consist of carbon nanotube plastic as EMC plastic. These materials use carbon nanotubes (CNTs) in order to achieve high conductivity and thus effective shielding.According to a particularly simple embodiment, the EMS-shielding plastic has embedded steel fibers in order to ensure the required electromagnetic shielding of the EMA element and of the EMA transfer element.The EMA transfer element has a contact region made of an electrically conductive material. The contact region may comprise a metal, an electrically conductive coating or a conductive foil. The contact portion is configured to be contacted with the air conditioner compressor housing when the receptacle is mounted to the air conditioner compressor housing.The EMA element and the EMA transfer element can each be formed as individual parts. According to one embodiment of the plug socket, the EMA element and the EMA transfer element are designed such that they can be inserted into one another to form a component element, so that the two elements are in contact with one another in the assembled state of the plug socket. According to a further embodiment, the EMA element and the EMA transfer element can be configured jointly as a one-piece element, wherein the one-piece element combines the properties of the EMA element and of the EMA transfer element.The tubular socket housing can be formed from plastic. Preferably, the tubular bushing housing is a plastic injection molded part.According to an advantageous embodiment, in which the bushing housing is a plastic injection molded part, the EMA element and the EMA transfer element are designed as injection molded insert elements and are integrated into the bushing housing in an injection molded manner by the material of the bushing housing as a sealing material. According to this embodiment, the EMA element and the EMA transfer element are embedded as insert elements in the plastic housing by a 2k injection molding process. The 2k injection molding method refers to an injection molding method also referred to as overmolding, in which additional plastic layers are added to an existing molded part. During the production of this embodiment, the EMA element, the EMA transfer element and the contact carrier are inserted into an injection mold and subsequently encapsulated by the plastic of the socket housing by injection molding. In this case, the material of the socket housing forms a sealing material for the fluid-tight embedding of the EMA element, the EMA transfer element and the contact carrier. In addition, a second sealing material in the form of an epoxy resin can be introduced into the socket housing from the outer side or from the mounting side. It is important that the electrically conductive contact region of the EMA transfer element and the electrical contact elements of the electrical vias of the contact carrier remain free.The EMA element and the EMA transfer element together preferably form the shape of a sleeve, wherein the electrical contact elements of the electrical vias are arranged at least on the outer side in the interior of the sleeve.In a further advantageous embodiment, the plug connector according to the invention can have a pressure compensation membrane which is arranged in the interior of the socket housing for pressure compensation between the outer side and the housing inner side. The pressure balancing membrane is selectively permeable to gaseous fluids so that liquids can be retained. The pressure compensation membrane can be fastened by adhesive bonding or welding. The pressure compensation membrane bonded or welded in this way contributes to reducing the driving pressure potential in the housing.On the outer circumference, the bushing housing can have a molded part seal, preferably an O-ring seal, for sealing with respect to the air conditioning compressor housing. It is important that a molded part adapted to the sealing situation is used, which radially or axially seals, or combines both sealing directions in a molded part seal.For fastening to the housing of the air conditioning compressor, the bushing housing can have a screw-on flange. A screw-on flange with four fastening points is advantageous. Alternatively, it can be provided that the bushing housing has an external thread, with which it can be screwed into a thread in the housing of the air conditioning compressor.The invention provides a plug socket which meets the requirements for fluid tightness in combination with electromagnetic compatibility.Further details, features and advantages of embodiments of the invention are evident from the following description of exemplary embodiments with reference to the associated drawings. The following are shown: FIG. 1 : shows a schematic exploded illustration of an exemplary embodiment of an electrical plug socket for electrically contacting an air-conditioning compressor, and FIG. 2 : several illustrations a) to e) of different views of the configuration of the electrical plug socket shown in FIG. 1 in the assembled state.Recurring features have the same reference numerals in the figures.FIG. 1 shows a schematic exploded view of an exemplary embodiment of an electrical plug socket for electrically contacting an air conditioning compressor. In this illustration, the components of the electrical jack are drawn apart along an imaginary line to illustrate their cooperation. The plug socket comprises a tubular socket housing 1, which has a screw-on flange 2 on the outer circumference with four openings 2.1 for fastening to an air conditioning compressor housing. Furthermore, the plug socket comprises a contact carrier 4 with electrical plated-through holes, an element for electromagnetic shielding 6 (EMA element) and an element for transferring the electromagnetic shielding 7 (EMA transfer element).The socket housing 1, which is designed as a plastic injection-molded part, has an outer side 8 and a mounting side 9. The outer side 8 of the socket housing 1 is shaped to receive an electrical plug (not shown). The mounting side 9 of the socket housing 1 is located on the inner side opposite the outer side 8 of the electrical socket, which inner side faces an air conditioning compressor housing inner side in the mounted state. In the example shown, the mounting side 9 serves for inserting the contact carrier 4, the EMA element 6 and the EMA transfer element 7 into the socket housing 1.The contact carrier 4 produced as a plastic injection-molded part has on the outer side 8 electrical contact elements 5.1 in the form of sleeves made of metal, which are designed to receive plug pins of a plug. The electrical contact elements 5.1 form a first end of the electrical vias of the contact carrier 4. On the mounting side 9, the contact carrier 4 has two elongate electrical contact elements 5.2 which emerge from the electrical vias and which, in the mounted state of the plug socket, project out of the socket housing 1 as a second end of the electrical vias. The elongated electrical contact elements 5.2 serve for electrical contacting in the interior of the air conditioning housing when the plug socket is mounted on the air conditioning compressor housing. The through-contacts are embedded as electrically conductive insert parts from the material of the contact carrier 4 and are thereby electrically insulated from the environment, wherein the electrical contact elements 5.1 and 5.2 are exposed for electrical contacting. The contact carrier 4 is a plastic injection molded part.The contact carrier 4, the EMA element 6 and the EMA transfer element 7 are designed such that they can be inserted into one another. By virtue of the mating connection, the contact carrier 4 is accommodated in the sleeve-shaped EMA element 6 (see FIG. 2 ). The EMA element 6 has a guide groove 6.1, wherein a guide web 7.1 is formed on the EMA transfer element 7. When the EMA element 6 and the EMA transfer element 7 are plugged together, the guide groove 6.1 and the guide web 7.1 cooperate in such a way that a forced positioning of both elements to form a component element is achieved. Together with the contact carrier 4, the EMA element 6 and the EMA transfer element 7 can be inserted into the tubular socket housing 1 on the mounting side 9. In this case, the EMA transfer element 7 has a crown-shaped widened contact region 7.2 at one end, with which contact region the plugged-together elements can be fixed in a clamping manner on the inner circumference of the tubular socket housing 1 (see FIG. 2 ). The component element formed from the EMA element 6 and the EMA transfer element 7 can thus be fixed in a clamping manner in the tubular bushing housing 1.According to the invention, the EMA element 6 and the EMA transfer element 7 are formed from a plastic that shields electromagnetic radiation (EMS). This plastic, which is referred to as EMC plastic, has an embedding of steel fibers in the example shown. The EMA element 6 and the EMA transfer element 7 are likewise designed as injection molded parts made of the EMC plastic.Furthermore, according to the invention, the EMA element 6 and the EMA transfer element 7 are embedded together with the contact carrier 4 with an epoxy resin introduced from the mounting side 9 as sealing material 12 in the tubular socket housing 1, as the mounted state of the plug socket of FIG. 2 in FIG. c) shows. The epoxy resin is introduced in a flowable form in such a way that the inner cross section of the tubular bushing housing 1 is completely filled. In this case, according to one configuration, the epoxy resin can be introduced into the tubular socket housing 1 from both sides, that is to say from the outer side 8 and from the mounting side 9, and can seal the inserted components EMA element 6, EMA transfer element 7 and contact carrier 4.On the mounting side 9, the tubular bushing housing 1 has a seal 3. In the exemplary embodiment shown, the seal 3 is designed as an O-ring seal, which is positioned in an annular groove formed on the tubular bush housing 1.FIG. 2 shows a plurality of illustrations a) to e) of different views of the configuration of the electrical plug socket shown in FIG. 1 in the assembled state. The central illustration a) of FIG. 2 shows a front view of the electrical jack, illustration b) showing a side view, FIG. c ) showing a plan view of the mounting side 9 and FIG. d ) showing a plan view of the outer side 8. To the right next to the illustration a) is illustration e), this being a sectional illustration along the section line A-A drawn in illustration a).FIG. d ) allows a plan view of the plug socket into a sleeve-shaped opening in which the electrical contact elements 5.1 of the electrical plated-through holes of the contact carrier 4 are located protected by the tubular socket housing 1. The electrical contact elements 5.1 are sleeve-shaped, so that stretcher pins of an electrical plug can be inserted. The screw-on flange 2 with its four openings 2.1 serves for fastening the plug socket to an air-conditioning compressor housing.FIG. c ) of FIG. 2 shows the mounting side 9 opposite the outer side 8, which is thus a plan view of the side of the electrical plug socket facing the air conditioner compressor housing interior. The electrical contact elements 5.2 protrude on this side.As can be seen from FIGS. a), b) and e), the tubular socket housing 1 has a cylindrical shank 10 below the screwing flange 2. At the periphery of the shaft 10, an annular groove is formed in which a seal 3 in the form of an O-ring is fitted. The seal 3 is provided for sealing the electrical receptacle at its outer periphery when it is mounted in an opening on an air conditioning compressor housing.The sectional view of FIG. 2 ) of FIG. 2 allows a view into the interior of the plug socket along the section line A-A. The contact carrier 4, the EMA element 6 and the EMA transfer element 7 are accommodated in a fitted manner in the tubular socket housing 1. In this case, the contact carrier 4, the EMA element 6 and the EMA transfer element 7 are inserted into the tubular socket housing 1 in a plugged-together manner from the mounting side 9 as far as a stop edge 11. The stop edge 11 is formed on the inner periphery in the tubular bushing housing 1, so that the EMA element 6 together with the EMA transfer element 7 strike the stop edge 11 with a common end face. The stop edge 11 prevents a movement of the contact carrier 4, the EMA element 6 and the EMA transfer element 7 in the direction of the outer side 8. The contact carrier 4 with the electrical contact elements 5.1 is located within the sleeve-shaped EMA element 6. Thus, the contact carrier 4 and the electrical contact elements 5.1 are located within the electromagnetic shielding of the EMA element 6 and the EMA transfer element 7.Between an outer lateral surface of the component element plugged together from the EMA element 6 and the EMA transfer element 7 and the opposite inner surface of the tubular socket housing 1, a sealing material 12 in the form of an epoxy resin is introduced in a sealing gap provided for this purpose. Furthermore, the sealing material 12 is introduced into a sealing gap between the contact carrier 4 and the inner periphery of the component element plugged together from the EMA element 6 and the EMA transfer element 7. The sealing material 12 thus fills the intermediate spaces formed by the respective sealing gaps between the plugged-together component element and the tubular socket housing 1 and between the contact carrier 4 and the component element comprising the EMA element 6 and the EMA transfer element 7. The flowable epoxy resin penetrates into the intermediate spaces formed by the sealing gaps at the aforementioned positions and can cure there, whereby the tightness is produced.List of reference characters1 Tubular socket housing 2 screw-on flange 2.1 openings 3 seal 4 contact carriers with electrical through-contacts 5.1 electrical contact elements 5.2 electrical contact elements 6 EMA element 6.1 guide groove 7 EMA transfer element 7.1 guide web 7.2 contact region 8 outer side 9 mounting side 10 cylindrical shank 11 stop edge 12 sealing material

Claims

Electrical plug socket, especially high-voltage electrical plug socket, for the electrical power supply of an electrical air conditioning compressor, especially of an electrical air conditioning compressor of a vehicle, having a tubular socket housing (1) which is designed for fastening to an air conditioning compressor housing and in which a contact carrier (4) with electrical plated-through holes, an element for electromagnetic shielding (EMA element) (6) and an element for transferring the electromagnetic shielding (EMA transfer element) (7) to the electrical air conditioning compressor are accommodated on a mounting side (9), wherein the EMA element (6) and the EMA transfer element (7) are formed from a plastic which shields electromagnetic radiation (EMS) and are embedded together with the contact carrier (4) in the tubular socket housing (1) with a sealing material (12) introduced from the mounting side (9).Electrical jack according to Patent Claim 1, characterized in that the tubular jack housing (1) has at least one stop edge (11) which runs circumferentially on the inner circumference, wherein the EMA element (6), the EMA transfer element (7) and / or the contact carrier (4) are accommodated in the tubular jack housing (1) with an end face in a manner such that they stop.Electrical plug socket according to Patent Claim 1 or 2, characterized in that an electrically insulating casting compound, especially an epoxy resin, is introduced as sealing material (12) in the tubular socket housing (1).Electrical plug socket according to Patent Claims 1 to 3, characterized in that the EMS-shielding plastic is a conductive plastic with an electrically conductive embedding or filling and / or an electrically conductive coating.Electrical plug socket according to one of Patent Claims 1 to 4, characterized in that the EMA transfer element (7) has an electrically conductive contact region (7.2).Electrical plug socket according to one of Patent Claims 1 to 5, characterized in that the EMA element (6) and the EMA transfer element (7) are designed such that they can be inserted into one another to form a component element.Electrical plug socket according to one of Patent Claims 1 to 6, characterized in that the tubular socket housing (1) is designed as a plastics injection-moulded part.Electrical plug socket according to claim 7, characterised in that the EMA element (6) and the EMA transfer element (7) as injection-moulded insert elements are integrated in the tubular socket housing (1) in the form of a sealing material (12), over-moulded by the material of the tubular socket housing (1).Electrical plug socket according to one of Patent Claims 1 to 8, characterized in that the EMA element (6) and the EMA transfer element (7) together form the shape of a sleeve, electrical contact elements (5.1) of the electrical plated-through holes being arranged at least on an outer side (8) in the interior of the sleeve.The electrical jack according to any one of claims 1 to 9, further comprising a pressure compensation membrane arranged inside the tubular jack housing (1) for pressure compensation between the outer side (8) and the mounting side (9).Electrical plug socket according to one of Patent Claims 1 to 10, characterized in that the tubular socket housing (1) has on the outer circumference a seal (3), preferably an O-ring seal, for sealing with respect to the air-conditioning compressor housing.Electrical plug socket according to one of Patent Claims 1 to 11, characterized in that the tubular socket housing (1) has a screw-on flange (2) for fastening to the air-conditioning compressor housing.

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