Sealing device for compressor drive

Abstract

The present invention provides a sealing device for an electrically driven compressor of a water vapor fluid, in particular for a device for driving an electric motor, which can be manufactured in a simple manner and assembled in a time-saving manner. [Solution] A sealing device (19) for a compressor drive unit having a connection device (9) with at least one electrically conductive connection member (16) and a fixing member (17) for guiding an electrical connection through a wall of a housing (2), characterized in that at least one connection terminal member (16a) for accommodating the connection member (16) surrounded by the fixing member (17) and the sealing member (20), respectively, is formed around the entire circumference in the longitudinal direction by the fixing member (17) and the sealing member (20), the sealing member (20) is arranged in the region of the through-connection opening (2a) of the housing (2) between the housing (2) and the connection terminal member (16a) and is fixed to the housing (2) and the connection terminal member (16a), respectively, and seals in a fluid-tight manner in the radial direction, and at least one pressure member (21) is formed to form a seal acting in the radial direction by utilizing pressure acting on the sealing member (20) in the longitudinal direction.

Description

[Technical field]

[0001] The present invention relates to a sealing device for a compressor drive, more particularly to a device for compressing a water vapor fluid, in particular a refrigerant, in particular for an electric motor, for passing electrical connections through a wall of a housing thereof, the compressor being used in the refrigerant circuit of an air conditioning system of a motor vehicle. [Background technology]

[0002] Compressors for mobile applications known from the state of the art, in particular for automotive air conditioning systems that supply refrigerant via a refrigerant circuit, are composed of piston or scroll compressors with variable stroke volume, independent of the refrigerant, whereby the compressor is driven by a pulley or electrically. In addition to the electric motor for driving the compression mechanism, the electrically driven compressor comprises an inverter for driving the electric motor, which converts the direct current of the vehicle battery into alternating current which is supplied to the electric motor via an electrical connection. A conventional electric motor for an electrically driven compressor may consist of a ring-shaped stator core with a coil wound on top and a rotor, the rotor being disposed within the stator core, the rotor and stator being oriented on a common axis of rotation or symmetry with the rotor's axis of rotation.

[0003] The inverter has plug terminals for a plug connector formed with pins for connecting electrical connections to terminals of an electric motor, the plug terminals being electrically connected to terminal wires of the leads of the stator coil, also called phase conductors, the terminals of the electric motor being formed, for example, in a plug housing arranged on the end faces of the stator oriented in the axial direction of the stator. In the compressor assembly process, the plug connector is formed by pins respectively plugged into connection terminals provided on the plug housing, and is in contact with the end portions connected to the lead wires, particularly the terminal wires of the lead wires. Therefore, the end portions are electrically and mechanically connected to the terminal wires of the lead wires so that there is only a slight transition resistance between the plug connector of the inverter and the lead wires.

[0004] To prevent short circuits and damage to the inverter, particularly the electrical components arranged on the inverter board, which may lead to compressor failure, and to prevent the fluid flowing in the compressor, particularly the refrigerant and / or oil, from penetrating into the environment, the plug housing protrudes from the motor housing and is hermetically sealed and electrically insulated from the plug connector arranged towards the inverter located outside the motor housing. Therefore, in particular, the mechanical part of the compressor, which includes an electric motor and a compression mechanism driven by the electric motor and is filled with liquid refrigerant or oil, needs to be sealed from the inverter that functions as the electrical part of the compressor. A conventional glass-metal through connection port of a plug connector, in which the current conducting member is sealed with an elastic member, is used to meet the insulation resistance required for the electrical components and to reliably and completely insulate the current conducting member from the fluid that causes contamination flowing in the motor housing. A metal seal coated with acrylonitrile butadiene rubber abbreviated as NBR (hydrogenated nitrile rubber containing phenol, “Nitrile Butadiene Rubber ”) can be used as the elastic shaped part. The glass used as an insulating material and as the fixing part of each plug connector is configured in a specific shape according to the requirements of dimensions and electrical parameters.

[0005] The shape of the glass projection of a glass-metal feedthrough joint, also called a glass hoist, is difficult to adjust and reproduce, and its shape and quantity can have large manufacturing variations. When manufacturing a glass-metal feedthrough connector, a sintered hollow cylindrical glass is put into a melting tool along with a pin-type plug connector and a fixing body. Therefore, the tolerances of all components to be connected are added up. Many very time-consuming experiments must be performed with different amounts of glass and production parameters to create the desired glass shape and ensure reliability. Also, complex testing and proof of capability must be performed to prove compliance with the required limits. Sleeves with customized surfaces are required to enclose or seal the glass surface. In doing so, the large sealing variations must be balanced with high flexibility and precision. Especially for the elastomeric shaped parts that are the sealing members, it is very difficult to guarantee the high precision requirements.

[0006] Also, for electric compressors with an input voltage of at least 48V, the pin-type plug connector has a larger diameter because more current flows through it compared to compressors with an input voltage of 470V. It is very expensive to put a larger pin-type plug connector into the glass-metal feed-through. To ensure good sealing between the plug connector and the motor housing, it is possible to use separate O-ring seals, but this makes the installation very complicated during assembly. Also, one O-ring seal is provided for each plug connector.

[0007] Patent document 1 discloses an electrically driven compressor with a compressor device, an electric motor for driving a sealing device, and an inverter for supplying current to the electric motor. The electric motor includes a stator and a rotor with an electrically insulated coil body arranged at the end of the stator core and a coil arranged in the coil body, and a plug housing having a connection terminal for electrically connecting the coil to the inverter. In the coil body, the end face of the plug housing is mechanically connected with the stator. The plug connector is guided with a hermetic seal through a plate-type fixing member. An airtight seal is arranged between the fixing member and a separating wall of the motor housing facing the inverter. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] German Patent No. 112015001426 Summary of the Invention [Problem to be solved by the invention]

[0009] The object of the present invention is to provide a sealing device for an electrically driven compressor of a water vapor fluid, in particular for a device for driving an electric motor, which can be manufactured in a simple manner and assembled in a time-saving manner. In order to minimize the costs during production, the device should have a large number of individual components that are as small as possible and structurally easy to implement. In this way, the structure of the sealing device and the associated complexity of the device are minimized, while at the same time the sealing of the sealing system against the environment and the electrical insulation inside the compressor are optimized. [Means for solving the problem]

[0010] The object of the invention is achieved by the subject matter having the features of the independent claims. Further developments are given in the dependent claims. The object of the invention is achieved by a sealing device according to the invention for guiding an electrical connection through a wall of a housing for a compressor drive, the sealing device having a connecting device with at least one electrically conductive connecting member and a fastening member. According to the concept of the invention, the sealing device is formed by at least one connecting terminal element for receiving a connecting element in a longitudinal direction, the connecting terminal element being surrounded radially around the entire circumference by a fixing element and a sealing element respectively, so that the sealing elements, which are respectively radially sealed in the housing, in particular in the opening area of ​​the housing feed-through between the wall of the housing and the connecting terminal element, are fixedly arranged in an oil-tight manner on the housing and on the connecting terminal element.

[0011] According to the invention, the sealing device further comprises at least one pressure member for generating a radially acting seal by pressure against the sealing member acting in the longitudinal direction. As a result, the sealing device is formed in particular of a two-component structure, a sealing member and a pressure member. According to a further development of the invention, the connecting terminal elements are arranged in through-openings formed in a fixing element, preferably having a plate shape with oppositely disposed surfaces, the through-openings serving to accommodate the connecting terminal elements, such that the fixing element is advantageously fixed to the outside of the housing, the connecting terminal elements protruding through the through-openings of the housing into the space enclosed by the housing. Preferably, an end face of the connection terminal member is disposed at the same height as a side of the fixing member oriented in a direction away from the housing.

[0012] According to an advantageous design of the invention, the fastening element is provided on its side facing the housing with a receptacle for the sealing element which is formed around the circumferential through-opening in the form of a protrusion and which protrudes uniformly from the surface of the fastening element, in particular with a constant extension in the radial direction. The side oriented towards the housing and therefore the free end face of the receptacle is preferably provided with a raised portion having a rectangular cross section. Another advantage of the present invention is that the sealing member is formed in a ring shaped manner about the longitudinal axis. The sealing member preferably has an incision, in particular a V-shaped groove in cross section, formed around the entire circumference in the form of a notch in the axially oriented end face.Thereby, the sealing member is preferably formed with at least two axially oriented sealing lips, which are arranged in a first end face around the circumference of the sealing member and are concentric with each other.The sealing lips can be formed such that they are separated from each other by an incision and are tapered in their axially oriented free end section.

[0013] In doing so, advantageously, the first sealing surface is provided on a lateral surface of the inner first sealing lip facing radially inwards, while the second sealing surface is formed on a lateral surface of the outer second sealing lip facing radially outwards. Preferably, the first sealing surface of the sealing member is sealingly fixed to the connection terminal member and the second sealing surface in the feed-through opening area is sealingly fixed to the housing. The sealing member preferably has a shape surrounding the entire periphery of a second end face oriented axially distal to the first end face, the formation being advantageously formed in a corrugated shape having a rectangular cross section, the shape and dimensions of which correspond to the receptacle of the fixing member. The sealing members may be formed of an elastomer to ensure a respective sealing connection on each sealing surface. According to a preferred design of the invention, the pressure member is formed as a hollow cylinder with a tapered wall at its free end surface facing the sealing member substantially in the axial direction, resulting in a wedge shape, whereby the wall of the pressure member preferably protrudes into the incision made in the sealing member, the cross section of the incision in the sealing member and the wall of the pressure member being formed in correspondence with each other.

[0014] The pressure member may be formed with sections having different inner diameters arranged along the longitudinal axis, such that the pressure member preferably has at least two sections having different inner diameters and an internally stepped transition. According to a further advantageous design of the invention, the connecting terminal member is formed in a substantially annular cylindrical shape with sections having different outer diameters arranged along the longitudinal axis. In order to accommodate the connecting member, the connecting terminal member is preferably formed with an annular cylindrical opening, in particular a closed hole, starting from an end face toward the outside of the housing and toward the longitudinal axis direction of the connecting terminal member and extending in the longitudinal direction of the connecting terminal member. The first section of the connecting terminal member is preferably disposed within a through opening formed in the fixing member, whereby the first section of the connecting terminal member advantageously has an outer diameter that matches the inner diameter of the through opening with a clearance. A loose clearance fit radially fixes the connecting terminal member.

[0015] In particular, the connecting terminal member has a second section that connects the first section in the longitudinal direction and is formed with a larger outside diameter than the first section. The second section of the connecting terminal member can be surrounded by the sealing member on its entire periphery at least in a partial area. In this way, the second section of the connecting terminal member advantageously has an outside diameter that corresponds to the inside diameter of the sealing member with play. Further, the connecting terminal member is preferably formed with a third section having a smaller outer diameter than the second section and connecting the second section in a longitudinal direction such that a stepped transition is provided between the second and third sections. The connection terminal member may also have a fourth section that is formed with an outer diameter smaller than that of the third section and connects the third section in the longitudinal direction so that a stepped transition portion is provided between the third and fourth sections. The fourth section of the connection terminal member is preferably surrounded entirely by the lead wires of the stator coil of the electric motor so that the connection terminal member and the lead wires are in electrical contact with each other.

[0016] Another advantage of the present invention is that the area of ​​the second section of the connecting terminal member, which connects the third section to the third section, is surrounded by the pressure member over the entire circumference, so that the pressure member is relatively movable with respect to the connecting terminal member, in particular in the longitudinal and circumferential directions. Preferably, the first section of the pressure member is arranged in the area of ​​the second section of the connecting terminal member, and the second section of the pressure member is arranged in the area of ​​the third section of the connecting terminal member. According to a further preferred design of the invention, the connecting element is formed as a cylindrical pin plug connector, preferably with a straight pin shape, in particular in the form of an annular cylinder with a constant outer diameter. The connecting member is preferably inserted into an opening formed as a closed hole in an end surface of the connecting terminal member with a first end located forward and facing the outside of the housing, and is fixed, in particular by a screw. The connecting terminal member can be fixed in the axial direction by passing the connecting terminal member through the printed circuit board and fixing it to the opening of the connecting terminal member with a screw.

[0017] The connection member having a connection terminal member preferably serves to connect electrical terminals arranged inside the housing, in particular the leads of the coils of the electric motor stator, to electrical terminals arranged outside the housing, in particular the inverter, whereby the end faces of the connection terminal member can be electrically connected to conductor paths formed on a printed (circuit) board of the inverter. Alternatively, the connection member can be through-plated through the conductor paths of the printed (circuit) board.

[0018] A method of assembling a sealing device for guiding an electrical connection through a wall of a housing includes the following steps. - connecting at least one connecting terminal member to a fixing member by guiding the connecting terminal member along a longitudinal axis into a through opening formed in the fixing member; - pushing the sealing member onto the connection terminal member in the direction of the fixing member, so that the sealing member is disposed on the fixing member; - using the sealing member to press the pressure member in a longitudinal direction toward the fixing member onto the upper portion of the connection terminal member, so that the pressure member is disposed on the sealing member; - introducing the connecting terminal member in a longitudinal direction into a feed-through opening formed in a wall of the housing, the sealing member being disposed between the housing and the connecting terminal member; - connecting a lead wire, which is a terminal line of the coil, to the connection terminal member at an end surface area of ​​the connection terminal member; and - fastening the fastening member to the housing; - applying pressure to the sealing member disposed longitudinally on the stationary member such that the sealing member deforms longitudinally and radially and seals radially.

[0019] When the pressure member is pressed against the sealing member, the walls of the pressure member are forced in the longitudinal direction into the notches formed in the sealing member, whereby the sealing lips formed on the sealing member are forced apart in the radial direction and the sealing member having the sealing surface is pressed in the direction of the housing and the connecting terminal member. Furthermore, the connection member can be inserted, particularly threadedly inserted, into an opening formed in the connection terminal member in the longitudinal direction so that the connection member and the connection terminal member are coaxially oriented with each other and electrically connected to each other. A device for driving a compressor of a water vapor fluid, in particular an electric motor, has a rotor extending along a common longitudinal axis, a stator held stationary, and a housing, the stator preferably being arranged radially from the outside of the rotor while surrounding it.

[0020] The sealing device according to the present invention is formed on a first end face of the axially oriented stator. In this case, the axial direction is understood to be the direction of the longitudinal axis of the stator, which also coincides with the axis of rotation and the longitudinal axis of the rotor. The axially oriented end faces are arranged in a plane oriented perpendicular to the longitudinal axis. The advantageous design makes it possible to use the device for driving a compressor, in particular an electric motor, to compress water vapor fluid for a refrigerant compressor in a refrigerant circuit of a motor vehicle air conditioning system. Effect of the Invention

[0021] The sealing device according to the invention or the device for driving a steam fluid compressor equipped with a sealing device has, in summary, various additional advantages, such as: - A minimum number of components, corresponding for example to separate sealing elements such as metal seals, are omitted compared to state of the art devices. - Simple, time-saving assembly of less complex parts reduces assembly steps and minimizes production and assembly costs. - Radial sealing maximizes functional safety.

[0022] Further details, features and advantages of the inventive design are set forth in the following description of exemplary embodiments, with reference to the accompanying drawings, in which: [Brief description of the drawings]

[0023] [Figure 1a] 1 is a cross-sectional view of a device for connecting a compression mechanism and an inverter, particularly an electrically driven compressor having an electric motor. [Figure 1b] FIG. 1 is a perspective view of a stator of an electric motor including a stator core, coils, insulators, and fixing members. [Figure 2a] FIG. 2 is a perspective view of a connection arrangement of a sealing device for a connection element with a forming element and a fastening element for electrically connecting a terminal arranged in a plug housing to an inverter terminal of the state of the art; [Figure 2b] FIG. 2b is a detailed cross-sectional view of a sealing device with the connection device of FIG. 2a having a state-of-the-art sealing member; [Figure 2c] FIG. 2c is a detailed view of the sealing device of FIG. 2b, in particular the sealing member. [Figure 3a] 3A-3C are cross-sectional views of different details of a sealing device according to the invention for guiding an electrical connection through a housing of a compressor drive; [Figure 3b]3A-3C are cross-sectional views of different details of a sealing device according to the invention for guiding an electrical connection through a housing of a compressor drive; [Figure 3c] 3A-3C are cross-sectional views of different details of a sealing device according to the invention for guiding an electrical connection through a housing of a compressor drive; [Figure 4a] 3a to 3c , a view of a fixing member with a sealing member of the sealing device; [Figure 4b] FIG. 4 is a view of the sealing member of the sealing device of FIGS. 3a to 3c as a unitary member. [Diagram 5] FIG. 4 is a view of the pressure member of the sealing device of FIGS. 3a to 3c as a single member; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Fig. 1a shows a cross-sectional view of an electrically driven compressor (1) of a water vapor fluid, in particular for an air conditioning system of a motor vehicle for transporting a refrigerant through a refrigerant circuit, in which an electric motor (3) is arranged in a housing (2) as a device for driving an inverter (5) and a compression mechanism (4). The electric motor (3) is supplied with electrical energy via a switching device (6) of the inverter (5). The electric motor (3) has a stator (7) having a stator core with a substantially hollow cylindrical shape, a coil wound around the stator core, and a rotor (8) disposed within the stator (7). The rotor (8) rotates when electrical energy is supplied to the coil of the stator (7) via a connection device (9). Electrical energy is supplied to the stator (7) via the connection device (9). The connection device (9) is formed on an end face of the stator (7) and has a plurality of electrical connections.

[0025] The rotor (8) is coaxially disposed within the stator (7) and is rotatably arranged about an axis of rotation. The drive shaft (10) may be formed integrally with the rotor (8) or may be formed as a separate element. The electric motor (3) and the compression mechanism (4), for example formed by a scroll compressor having a fixed and a rotating helix, are arranged in a volume enclosed by the housing (2), whereby the housing (2) is formed from a first housing member for accommodating the electric motor (3) and a second housing member for accommodating the compression mechanism (4), preferably made from metal, in particular aluminum. The rotating helix of the compression mechanism (4), in which the water vapor fluid, in particular the refrigerant, is compressed, is driven via a drive shaft (10) connected to a rotor (8) of the electric motor (3). According to an embodiment not shown, the compression mechanism may be formed, for example, by a swash plate. The switching device (6) for controlling the operation of the electric motor (3) comprises a printed circuit board (12) formed with different switching members (11). Different drive circuits and components that are supplied with electrical energy from an external power source are assembled on the printed circuit board (12) so as to be electrically connected thereto.

[0026] Figure 1b shows in perspective view the stator (7) of the electric motor (3). The stator (7) is formed of a stator core (7a), coils (7b), insulators (7c) and a stationary element (14) having a receiving member (14a) for a plug housing (14c). The electric motor (3), for example a three-phase AC motor, has a rotor (not shown) and a stator core (7a) arranged radially around the rotor, preferably outside the rotor. The stator core (7a), preferably formed of a lamination stack, and the insulator (7c), formed of an electrically insulating material, extend from a first cross section to a second cross section of the stator (7) along a longitudinal axis (13) that coincides with the longitudinal axis of the stator (7) and the axis of rotation of the rotor, respectively. The coils 7b are each formed of a conductor wire, also called a lead wire 15, wound around a region extending radially inward of the stator core 7a. The unwound ends of the lead wires 15 are guided outside the respective windings as terminal lines.

[0027] The stator core (7a), the insulator (7c) and the coils (7b) form a stator unit of the electric motor (3). A support member (14) having a receiving member (14a) with connection passages (14b) for a plug housing (14c) with connection terminals is arranged on a first end face of the stator (7). The connection terminals of the plug housing (14c) each serve as components of an electrical connection between the coils (7b) of the electric motor (3) and an inverter (5) (not shown), in particular as components corresponding to conductive pin-shaped connection members guided through the connection passages (14b) of the receiving member (14a) of the support member (14) and inserted into the connection terminals of the plug housing (14c). The terminal lines of the lead wires (15) of the coil (7b) and the connection terminals of the plug housing (14c) disposed in the receiving member (14a) are connected to each other in an electrically conductive manner.

[0028] In the assembled state of the stator (7), the support member (14) with the receiving member (14a) and the plug housing (14c) arranged in the receiving member (14a) is fixed axially to the stator (7), in particular to the stator core (7a). In this way, the receiving member (14a) for the plug housing (14c) is formed as a component of the support member (14). The support member (14) with the receiving member (14a) with the connecting passage (14b) for the plug housing (14c) with the connecting terminals is formed as a single unit, in particular as a single-piece injection-molded part. The formation of the single piece is realized within the molding process. The connection passage 14b is provided in the housing of the receiving member 14a to accommodate a connection member as an electric connector to the inverter 5 (not shown) through the housing of the receiving member 14a and into the plug housing 14c. The connection passage 14b is oriented in the axial direction.

[0029] FIG. 2a shows in a perspective view a connection device (9′), in particular a glass-metal electrical feed-through, of a sealing device for a connection element (16) with a fastening element (17′) and a shaping element (18′) for the electrical connection of a terminal arranged in a plug housing (14c) not shown, which is connected to the terminal of a state-of-the-art inverter (5) not shown.

[0030] Figure 2b shows a cross-sectional view of a sealing device (19') with a sealing member (20') for sealing the fixing member (17') to the state-of-the-art housing (2) in the connecting device (9') of figure 2a. Figure 2c shows a detailed view of the sealing member (20') of figure 2b in particular. The connecting elements (16) are arranged to be guided through a plate-like fixed element (17'). All connecting elements (16) having a straight pin shape, hereinafter also called plug connectors (16), are arranged to form three different regions oriented along a common axis, in particular the longitudinal direction, such that the respective first and second regions protrude from opposite surfaces of the plate-like fixed element (17'). The third regions of the plug connectors (16) are respectively arranged within the fixed element (17').

[0031] The plug connectors (16), preferably formed as straight annular cylinders with a constant diameter along their length, are placed in through-openings in the fixing element (17') with the third section respectively, so that the inner diameter of the through-opening corresponds to the outer diameter of the plug connector (16) with a clearance for assembling and fixing the plug connector (16) in the through-opening. The gap formed between the plug connector (16) and the wall of the fixing element (17') passing around the through-opening is filled by a shaped element (18'), in particular a glass shaped element or a glass body. The gap-filling shaped element (18'), preferably made of glass, serves on the one hand to fix the plug connector (16) in the through-opening and thus on top of the fixing element (17') and on the other hand to insulate the electrically conductive plug connector (16) from the fixing element (17'). In this way, the shaped element (18') protrudes from the plane of the corresponding surface of the fixing element (17') in the direction of the plug connector (16). The projections of the shaping member (18') each have a substantially conical or frusto-conical shape.

[0032] As shown in Figures 2b and 2c, the sealing element 20', which seals the fixing element 17' with the plug connector 16 protruding from the fixing element 17' and the shaping element 18' towards the housing 2, is arranged on the side of the fixing element 17' oriented towards the housing 2. The sealing element 20', which is fixed on the one hand, in particular to the sealing seat surface of the housing 2, and on the other hand to the fixing element 17', serves to hermetically seal the housing 2 and prevents fluids flowing inside the housing 2, in particular the refrigerant and / or oil, from leaking into the environment and entering the inverter 5 (not shown) and the electrical components arranged on the printed (circuit) board 12 of the inverter 5. The sealing member (20') is made of an NBR coated metal seal with a sealing bead (20a') which is compressed by tightening a fixing screw for connecting the fixing member (17') to the housing (2). Differential temperature loads can cause deformation and contraction of the sealing member (20'), which can affect the alignment of the entire component comprising the housing (2), the fixing member (17') and the sealing member (20') and reduce the remaining torque (rotational force) of the housing (20') or cause loosening of the threaded connection or fixing screws, ultimately causing leakage in the area of ​​the fixing member (17').

[0033] Figures 3a to 3c show in different detailed cross-sectional views a sealing device (19) according to the invention for guiding an electrical connection member passing through the compressor housing (2), in particular a plug connector (16) for connection to an electric motor as a compressor driving device. An electric motor stator (7) including a stator core (7a), a coil (7b), an insulator (7c) and a support member (14) is disposed within a housing (2) having side walls and end faces with a through opening (2a) for guiding a plug connector (16) therethrough. The ends of the lead wires (15) wound around the coils (7b) around the region of the stator coils (7a) extending radially inward are guided outside each winding as terminal wires and connected to the connection terminal members (16a) along the support members (14). The connection terminal members (16a) serve as components of the electrical connection between the coils (7b) of the electric motor (3) and the inverter (5), in particular as electrically conductive pin-type plug connectors (16), the first ends of which are guided and arranged to pass through the through-connection openings (2a) formed in the end faces of the housing (2) or are arranged to be accommodated in the through-connection openings (2a) and plugged into the connection terminal members (16a).

[0034] The switch device (6) of the inverter (5) including the printed circuit board (12) and the switch member (11) provided on the printed circuit board is fixed to an end surface of the housing (2) facing the periphery of the housing (2), thereby allowing the printed circuit board (12) to be fixed to the housing (2). The plug connector 16 is plated through conductor paths in the printed circuit board 12 to provide a conductive connection between the switch device 6 of the inverter 5 and the connection terminal member 16a to the leads 15 of the coil 7b of the stator 7 through the plug connector 16. Alternatively, the connection terminal member 16a can be electrically connected to conductor paths formed in the printed circuit board 12 on the end surface facing the printed circuit board 12. The connection terminal member (16a) is disposed within a through-opening (17a) formed in the fixed member (17). In this way, the substantially cylindrical connection terminal member (16a) has regions having different outer diameters along its longitudinal axis. The first section (16a-1) is formed with an outer diameter that matches the inner diameter of the clearance-containing through-opening 17a formed in the fixed member 17. The connection terminal member (16a) is connected to the fixed member (17) via a loose fit in the through-opening (17a).

[0035] The second section (16a-2), which joins the first section (16a-1) in the axial direction, i.e., the longitudinal direction of the connection terminal member (16a), has an outer diameter larger than that of the first section (16a-1). The second section (16a-2) is surrounded at least in part by the ring-shaped sealing member (20) all around the circumference, so that the second section (16a-2) is formed with an outer diameter that matches the inner diameter of the ring-shaped sealing member (20) with a play for pressing the sealing member (20) onto the connection terminal member (16a). On the other hand, the third section (16a-3), which is coupled to the second section (16a-2) in the longitudinal direction of the connection terminal member (16a), has a smaller outer diameter than the second section (16a-2), and therefore a step-type transition portion is formed between the second section (16a-2) and the third section (16a-3).

[0036] The area of ​​the second section (16a-2) of the connecting terminal member (16a) connecting the third section (16a-3) and the third section (16a-3) of the connecting terminal member (16a) is surrounded by a pressure member (21) formed substantially in the shape of a hollow cylinder over the entire circumference. The third section (16a-3) of the connecting terminal member (16a) is formed with an outer diameter that corresponds to the inner diameter of the pressure member (21) with a play for pressing the pressure member (21) into the connecting terminal member (16a). In this way, the inner diameter of the pressure member (21) is larger in the area of ​​the second section (16a-2) of the connecting terminal member (16a) than the outer diameter of the second section (16a-2) of the connecting terminal member (16a), particularly in the assembled state of the sealing device (19) according to FIG. 3c. As a result, the pressure member (21) is formed with at least two sections (21-1, 21-2) having different inner diameters and a stepped transition portion formed thereby. In the assembled state of the sealing device (19), the first section (21-1) of the pressure member (21) is arranged in the region of the second section (16a-2) of the connection terminal member (16a), and the second section (21-2) of the pressure member (21) is arranged in the region of the third section (16a-3) of the connection terminal member (16a).

[0037] In the region of the second section (16a-2) of the connection terminal member (16a), the connection terminal member (16a) is surrounded by the housing (2) such that the inner lateral surface of the sealing member (20) sealingly seats against the outer lateral surface of the second section (16a-2) of the connection terminal member (16a) and the outer lateral surface sealingly seats against the inner surface of the through-connection opening (2a) of the housing (2). Meanwhile, the fourth section (16a-4) that is coupled to the third section (16a-3) in the longitudinal direction of the connection terminal member (16a) has a smaller outer diameter than the third section (16a-3), so that a step-like transition is formed between the third section (16a-3) and the fourth section (16a-4) of the connection terminal member (16a). The fourth section (16a-4) of the connection terminal member (16a) is surrounded by the lead wire (15) of the coil (7b) of the stator (7) all around. In this way, the lead wire (15) can be seated on the lateral surface of the fourth section (16a-4) of the connection terminal member (16a) all around, and further seated on the end face of the step-like transition formed between the third section (16a-3) and the fourth section (16a-4). Thus, an electrical contact is generated between the lead wire (15) and the connection terminal member (16a).

[0038] The substantially annular cylindrical connecting terminal member 16a is formed as a round bar, starting from a first end face facing the printed circuit board, extending in the longitudinal direction of the connecting terminal member 16a and having an annular cylindrical opening, in particular a closed hole, for receiving the plug connector 16. During assembly of the connecting device 9, the plug connector 16 is inserted in the longitudinal direction into the opening and in particular screwed together, such that the plug connector 16 and the connecting terminal member 16a are coaxially oriented with respect to each other. The plug connector 16 is therefore formed with an outer diameter that corresponds to the inner diameter of the opening formed in the connecting terminal member 16a. A first end surface of the connection terminal member (16a) is disposed at the same height as the surface of the plate-shaped fixing member (17) facing away from the housing (2).

[0039] In particular, Figure 3c shows the ring-shaped sealing member 20 in cross section with the longitudinal axis of the plug connector 16 and the connecting terminal member 16a shown as the main axis of symmetry of the sealing member 20. In so doing, the sealing member 20 is shown as having two cross sections which are symmetrical to each other with respect to the main axis of symmetry. The shapes of the cross sections are identical to each other. However, the two cross sections of the sealing member 20 each have an axis of symmetry oriented parallel to the main axis of symmetry. The radially sealed ring-shaped sealing element (20) has an incision (20a) formed on its axially oriented first end face in the form of a V-shaped cross-section notch or groove around its entire periphery, such that the sealing element (20) is formed with two sealing lips (20b-1, 20b-2). The sealing lips (20b-1, 20b-2) arranged around the first end face of the ring-shaped sealing element (20) in the circumferential direction are separated from each other by the incision (20a) in the first end face region and are tapered towards the free end section.

[0040] The inner lateral surface of the first inner sealing lip (20b-1) is formed with a first radially facing sealing surface (20c-1), and the outer lateral surface of the second outer sealing lip (20b-2) of the ring-shaped sealing member (20) is formed with a second radially facing sealing surface (20c-2), also shown in Figures 4a and 4b, such that the first sealing surface (20c-1) of the sealing member (20) formed on the inner lateral surface of the first sealing lip (20b-1) sealingly seats on the connecting terminal member (16a), and the second sealing surface (20c-2) formed on the outer lateral surface of the second sealing lip (20b-2) sealingly seats on the inner surface of the through-connection opening (2a) of the housing (2). Thus, the sealing member (20) is disposed in a gap-shaped intermediate space formed between the through-connection opening (2a) of the housing (2) and the connection terminal member (16a) to seal the gap.

[0041] In Fig. 4a, the fixing member (17) of the connecting device (9) is shown together with the sealing member (20) of the sealing device (19), whereas in Fig. 4b, the sealing member (20) of the sealing device (19) is shown as a single element. The sealing member (20) is made of an elastomer. The sealing member (20) has a circumferentially continuous formation (20d) on a second end face oriented axially distal to the first end face, the formation (20d) being formed in a wavy shape having a rectangular cross section. The fixing member (17) is provided on its side facing the inside of the housing (2), and therefore the sealing member (20), with a receptacle (17b) for the sealing member (20) formed in a protruding manner around the entire circumference of the through opening (17a). The receptacle (17b) protrudes uniformly from the surface of the fixing member (17). Furthermore, a rectangular cross-sectional raised portion is provided on the free end face of the receptacle (17b), the dimensions of which correspond to the likewise rectangular formation (20d) formed on the second end face of the sealing member (20). As a result, the formation (20d) of the sealing member (20) is attached to the raised portion of the receptacle (17b) and is thereby connected to the fixing member (17). In this way, the end faces of the ring-shaped sealing member (20) and the receptacle (17b) of the fixing member (17) are arranged flush with each other.

[0042] The pressure member (21), which corresponds to the sealing member (20), is formed with an axially tapered wall (21a) on the free end surface of the first section (21-1) facing the sealing member (20), forming a wedge shape, as shown in particular in FIG. 5. The tapered wall (21a) of the pressure member (21) is arranged to protrude into the cutout (20a) provided in the sealing member (20). The cross section of the cutout (20a) of the sealing member (20) and the tapered wall (21a) of the pressure member (21) are formed correspondingly to each other, so that during the pressure member (21), which is formed in particular of a hard plastic, such as a thermoplastic or thermosetting material, gradually penetrates into the cutout (20a) in the axial direction, the sealing lips (20b-1, 20b-2) of the sealing member (20) are radially separated from each other and pressed against the housing (2) on the one hand and against the connecting terminal member (16a) on the other hand. At the same time, the sealing member (20) is pressed against the receptacle (17b) of the fixing member (17) so that a counter pressure is created against the sealing member (20).

[0043] In reaction to the pressure, the pressure member (20) is subjected to a force radially outward and inward to create a radial pressure, thereby pressing the sealing surfaces (20c-1, 20c-2) of the sealing member (20) against the housing (2) and the connecting terminal member (16a) so as to ensure a radial seal. In order to ensure the mobility of the pressure member (21) relative to the connecting terminal member (16a), the pressure member (21) has a smaller axial extension or length in the region of the second section (21-2) than the connecting terminal member (16a) located in the region of the third section (16a-3). By doing so, the pressure member (21) with the free end face of the second section (21-2) opposite to the end of the first end face (21-1) with the tapered wall (21a) and the connecting terminal member (16a) with the end face formed between the third section (16a-3) and the fourth section (16a-4) at the stepped transition are fixed to the lead wire (15), while the lead wire is pressed against the support member (14). The second end face of the connecting terminal member (16a) oriented distal to the first end face protrudes into the interior of the support member (14). During the firm positioning of the stator (7) and the support member (14) in the housing (2) and fixing to the housing (2), by moving the fixing member (17) axially, e.g. via a screw connection, the sealing member (20) arranged on the fixing member also moves axially and is pressed against the pressure member (21) so that a sealing effect between the housing (2) and the connecting terminal member (16a) is achieved. [Explanation of symbols]

[0044] 1 Compressor 2. Housing 2a Housing (2) feed-through connection port 3. Equipment, electric motor 4. Compression mechanism 5. Inverter 6 Switching device 7 Stator 7a Stator core 7b Coil 7c Insulation 8 Rotor 9, 9′ Connection device 10 Drive shaft 11 Switch parts 12 Printed circuit board 13 Vertical axis 14 Support member 14a Receiving member 14b Connecting passage 14c Plug Housing 15 Lead Wiring 16 Connection parts, plug connectors 16a Connection terminal material 16a-1 First section of the connection terminal portion (16a) 16a-2 Second section of the connection terminal portion (16a) 16a-3 Third section of the connection terminal portion (16a) 16a-4 Fourth section of the connection terminal portion (16a) 17, 17′ Fixing member 17a Through opening of fixing member (17) 17b Receptacle for sealing member (20) 18' Shaped Member 19, 19′ Sealing device 20, 20' sealing member 20a Groove of sealing member (20) 20a' Sealing bead of sealing member (20') 20b-1 First sealing lip of the sealing member (20) 20b-2 second sealing lip of the sealing member (20) 20c-1: First sealing surface of the sealing member (20) 20c-2 the second sealing surface of the sealing member (20) 20d Formation portion of sealing member (20) 21 Pressure member 21-1 First section of sealing member (20) 21-2 Second section of sealing member (20) 21a Wall surface of pressure member (21)

Claims

1. A sealing device (19) for a compressor drive for guiding an electrical connection through a wall of a housing (2), the sealing device (19) having a connection device (9) with at least one electrically conductive connection member (16) and a fastening member (17), at least one connection terminal member (16a) for receiving said connection member (16) surrounded by said fixing member (17) and said sealing member (20), respectively, is formed around said entire circumference in said longitudinal direction by said fixing member (17) and said sealing member (20); - said sealing member (20) is arranged in the region of the through-connection opening (2a) of said housing (2) between said housing (2) and said connecting terminal member (16a) and is fixed to said housing (2) and said connecting terminal member (16a) and seals respectively in said radial direction in a fluid-tight manner; a sealing device for a compressor drive, characterized in that at least one pressure member (21) is configured to create a seal acting in said radial direction by means of a pressure acting in the longitudinal direction against said sealing member (20).

2. In paragraph 1, The connection terminal member (16a) is disposed in a through opening (17a) formed in the fixing member (17).

2. The sealing device for a compressor drive unit according to claim 1, characterized in that the fixing member (17) is seated on the outside of the housing (2), and the connecting terminal member (16a) passes through the through-connection opening (2a) of the housing (2) and protrudes inside the volume enclosed by the housing (2).

3. In claim 1 or 2, the fixing member (17) is formed in a plate shape having oppositely arranged surfaces and at least one through opening (17a) for accommodating the at least one connecting terminal member (16a).

4. In paragraph 2 or paragraph 3, the sealing device for a compressor drive unit as described in claim 2 or 3, characterized in that an end face of the connection terminal member (16a) is arranged at the same height as a surface of one side of the fixing member (17) oriented away from the housing (2).

5. A sealing device for a compressor drive according to any one of claims 2 to 4, characterized in that, on one side oriented towards the housing (2), the fixing member (17) has a receptacle (17b) for the sealing member (20) formed in a protruding manner around the entire circumference of the through opening (17a).

6. 6. A sealing device for a compressor drive as claimed in claim 5, characterized in that a raised portion having a rectangular cross section is formed on the one side of the receptacle (17b) oriented towards the housing (2).

7. The sealing device for a compressor drive device according to any one of claims 1 to 6, characterized in that the sealing member (20) is formed in a ring shape around the longitudinal axis.

8. The sealing device for a compressor drive unit according to claim 7, characterized in that the sealing member (20) is formed around the entire circumference from the axially oriented end face in the form of a notch, in particular a groove having a V-shaped cross section.

9. In claim 7 or claim 8, the sealing device for a compressor drive device according to claim 7 or 8, characterized in that the sealing member (2) is formed with at least two sealing lips (20b-1, 20b-2) oriented in the axial direction, arranged on an end face of the sealing member (20), continuing around the periphery of the sealing member (20) and concentric with each other.

10. A sealing device for a compressor drive according to claim 9, characterized in that the sealing lips (20b-1, 20b-2) are tapered in their axially directed free end sections.

11. The sealing device for a compressor drive device according to claim 9 or 10, characterized in that the first sealing surface (20c-1) is formed on a lateral surface of the inner first sealing lip (20b-1) facing radially inward, and the second sealing surface (20c-2) is formed on a lateral surface of the outer second sealing lip (20b-2) facing radially outward.

12. In claim 11, the first sealing surface (20c-1) of the sealing member (20) is arranged to be sealingly seated against the connection terminal member (16a), and the second sealing surface (20c-2) is arranged to be sealingly seated against the housing (2).

13. 13. The sealing device for a compressor drive according to claim 8, wherein the sealing member (20) extends around the entire circumference from a second end face oriented distally relative to the first end face in the axial direction.

14. The sealing device for a compressor drive unit according to any one of claims 6 to 13, characterized in that the forming portion (20d) is formed in a wave shape having a rectangular cross section, and its shape and dimensions match those of the receptacle (17b) of the fixing member (17).

15. 15. The sealing device for a compressor drive device according to claim 1, wherein the pressure member (21) has a tapered ring wall (21a) on the free end surface facing the sealing member (20) in the axial direction and is formed substantially in the shape of a hollow cylinder.

16. In claims 8 and 15, the pressure member (21) is arranged so that the wall (21a) protrudes into the incision (20a) formed in the sealing member (20). The sealing device for a compressor drive device according to any one of claims 6 to 15,

17. 17. A sealing device for a compressor drive as claimed in claim 15 or 16, characterized in that the pressure member (21) is formed in sections having different internal diameters arranged along the longitudinal axis.

18. The sealing device for a compressor drive device according to claim 17, characterized in that the pressure member (21) is formed with at least two sections (21-1, 21-2) having different inner diameters and a step-type transition portion on the inside.

19. 19. The sealing device for a compressor drive unit according to any one of claims 1 to 18, characterized in that the connection terminal member (16a) is composed of sections having different outer diameters arranged along the longitudinal axis and is formed into a substantially annular cylindrical shape.

20. In any one of claims 1 to 19, the connecting terminal member (16a) is formed with an annular cylindrical, in particular closed hole-shaped, opening for accommodating the connecting member (16), starting from the end face facing toward the outside of the housing (2) and extending in the longitudinal direction of the connecting terminal member (16a). A sealing device for a compressor drive unit as claimed in any one of claims 1 to 19, characterized in that the connecting terminal member (16a) is formed with an annular cylindrical, in particular closed hole-shaped, opening for accommodating the connecting member (16), starting from the end face facing toward the outside of the housing (2) and extending in the longitudinal direction of the connecting terminal member (16a).

21. In claim 19 or claim 20, the sealing device for a compressor drive unit as described in claim 19 or 20, characterized in that the first section (16a-1) of the connection terminal member (16a) is arranged in a through opening (17a) formed in the fixed member (17), and the first section (16a-1) of the connection terminal member (16a) has a clearance and is formed with an outer diameter that matches the inner diameter of the through opening (17a).

22. In claim 21, the connection terminal member (16a) has a first section (16a-2) connected to the first section (16a-1) in the longitudinal axis direction and formed with an outer diameter larger than that of the first section (16a-1).

23. In claim 22, the second section (16a-2) of the connection terminal member (16a) is surrounded by the sealing member (20) around the entire periphery, at least in an area, of the sealing device for a compressor drive unit.

24. 24. The sealing device for a compressor drive device according to claim 23, characterized in that the second section (16a-2) of the connection terminal member (16a) has a clearance and is formed with an outer diameter that matches the inner diameter of the sealing member (20).

25. In claims 22 to 24, the connection terminal member (16a) has a third section (16a-3) connected to the second section (16a-2) in the longitudinal axis direction and formed with an outer diameter smaller than that of the second section (16a-2). A sealing device for a compressor drive unit as described in any one of claims 22 to 24.

26. In claim 25, the third region (16-2) and a region of the second section (16a-2) of the connecting terminal member (16a) arranged in connection with the third section (16a-3) are surrounded by the pressure member (21) around the entire periphery, and the pressure member (21) is arranged to be movable relative to the connecting terminal member (16a). A sealing device for a compressor drive unit as described in claim 25,

27. The sealing device for a compressor drive unit according to claim 26, characterized in that the first section (21-1) of the pressure member (21) is arranged within the region of the second section (16a-2) of the connecting terminal member (16a), and the second section (21-2) is arranged within the region of the third section (16a-3) of the connecting terminal member (16a).

28. In any one of claims 25 to 27, the connection terminal member (16a) has a fourth section (16a-4) connected to the third section (16a-3) in the vertical axis direction and formed with an outer diameter smaller than that of the third section (16a-3). A sealing device for a compressor drive unit as described in any one of claims 25 to 27.

29. 29. The sealing device for a compressor drive unit according to any one of claims 1 to 28, characterized in that the connecting member (16) is formed of a cylindrical pin-type plug connector.

30. 30. The sealing device for a compressor drive unit according to claim 29, characterized in that the connecting member (16) is formed into the annular cylindrical shape having a constant outer diameter.

31. In claim 29 or 30, the sealing device for a compressor drive unit as described in claim 29 or 30, characterized in that the connecting member (16) is inserted and arranged, in particular screwed, inside an opening formed with a closed hole on an end face of the connecting terminal member (16a) whose first end is in the front and oriented toward the outside of the housing (2).

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