Electrical feedthrough and method for mounting an electrical feedthrough in a corresponding conical housing opening of an electric refrigerant compressor

Abstract

This invention relates to an electrical feeder and a method for installing the electrical feeder in a corresponding conical housing opening of an electric refrigerant compressor. The electrical feeder is an encapsulated electrical component in an electric refrigerant compressor, particularly an electric R744 refrigerant compressor, of an air conditioning system, particularly a vehicle air conditioning system. The electrical feeder has a conical sleeve and conductive metal pins pressed into a corresponding conical housing opening in a metal housing. The conductive metal pins have a conical portion corresponding to the inner cone angle of the conical sleeve. The conical sleeve is formed of a cross-linked thermosetting plastic and has at least one inner circumferential annular protrusion and at least one outer circumferential annular protrusion forming a surrounding sealing press fit in the conical housing opening. No additional binder or connector is introduced between the inner wall of the conical housing opening and the conical sleeve, or between the contact surface of the conductive metal pin and the contact surface of the conical sleeve.

Description

Technical Field

[0001] This invention relates to an electrical feeder for encapsulated electrical components in air conditioning systems, particularly in electric refrigerant compressors of vehicle air conditioning systems, especially electric R744 refrigerant compressors. The invention also relates to a method for installing the electrical feeder, by which the electrical side, i.e., the power electronic devices and inverter, is permanently and dielectrically separated from the pressurization area of ​​the compressor, while simultaneously reliably transmitting power to the motor housing. Background Technology

[0002] Electrically operated refrigerant compressors are central structural components of modern air conditioning and heat pump systems, particularly in the automotive technology sector. These compressors increasingly utilize the natural refrigerant R744 (CO2) because of its exceptionally low global warming potential and high energy efficiency. However, the use of R744 presents significant design challenges. First, the refrigerant operates at very high pressures, significantly higher than those of conventional refrigerants such as R134a or R1234yf. Second, contact with compressor oil can corrode polymer-based seals. Additionally, a permanent and reliable separation must be ensured between the pressurized area and the area exposed to atmospheric pressure in electric compressors. Failure to achieve this separation will immediately result in refrigerant loss, leading to compressor failure.

[0003] To provide electrical contact, so-called E-pins are used, which act as feedthrough elements through the metal motor housing. These E-pins provide both the power supply to the internally located electric motor and a seal between the electrical and mechanical sides of the system. In practice, tapered feedthroughs are used here, in which case a metal pin with a tapered portion is pressed into a corresponding tapered bore in the compressor housing along with a tapered sleeve made of thermosetting plastic. The tapered geometry ensures a force-locking fit and high contact pressure. However, since the refrigerant R744 itself can diffuse through tiny gaps or pores, a simple press fit is insufficient to ensure a strong seal. For this reason, an epoxy resin adhesive is used to wet the tapered surfaces before bonding. The pressing of the tapered sleeve causes the adhesive to distribute in the tapered gaps. Curing then takes place in an oven, typically at a temperature of approximately 160°C for at least 45 minutes.

[0004] However, this approach has drawbacks. It has been shown to be time-consuming and costly because the sealing performance depends on numerous process parameters. These include the exact volume of adhesive applied, the distribution and positioning of the adhesive on the conical surface, the pressing pressure applied during the bonding process, and the insertion path of the E-pin. Temperature management parameters during curing are also included. Even slight deviations can mean too little adhesive or the formation of unwanted air bubbles. Both increase the risk of leakage during operation at high operating pressures.

[0005] This situation is particularly problematic for use in R744 refrigerant compressors. Due to the high pressure levels, even microscopic leaks can lead to potential or even rapid loss of the medium. Once refrigerant enters the electrical areas of the inverter, there is a risk of electrical short circuits with serious damage. Simultaneously, the electrical feedthrough is exposed to high heat loads because the ambient heat in the vehicle's engine compartment affects the components. This places additional demands on the durability of the adhesives and plastics used. Therefore, for mass production of electric R744 refrigerant compressors, the known method of using conical feedthroughs with epoxy adhesives and oven curing has proven to be particularly sensitive, time-consuming, and costly, exhibiting only low robustness to process and production variations. Summary of the Invention

[0006] Therefore, the object of this invention is to propose a concept for an electrical feeder for use as an encapsulated electrical component in an air conditioning system, particularly in an electric refrigerant compressor of a vehicle air conditioning system, especially an electric R744 refrigerant compressor. This electrical feeder is resistant to refrigerant and compressor oil and allows for simple installation. The invention also aims to provide a method for installing the electrical feeder.

[0007] This objective is achieved by a subject matter having features according to one aspect of the invention and a method having features according to other aspects of the invention. Improvements and variations are presented in the corresponding appended aspects of the invention.

[0008] An electrical feeder is proposed for use as an encapsulated electrical component in an air conditioning system, particularly in an electric refrigerant compressor of a vehicle air conditioning system, especially an electric R744 refrigerant compressor. According to the invention, the electrical feeder has a tapered sleeve and conductive metal leads, which are pressed together into corresponding tapered housing openings in a metal housing. The conductive metal leads have tapered portions corresponding to the inner cone angle of the tapered sleeve. The tapered sleeve is formed of a cross-linked thermosetting plastic and has at least one inner circumferential annular protrusion and at least one outer circumferential annular protrusion. The at least one inner circumferential annular protrusion and at least one outer circumferential annular protrusion form a circumferential sealing press fit in the housing opening without requiring additional binders or adhesives. Therefore, no additional binders or adhesives are introduced between the inner wall of the tapered housing opening and the tapered sleeve, or between the contact surfaces of the conductive metal leads and the contact surfaces of the tapered sleeve.

[0009] It has been discovered that the required sealing performance can be achieved simply by axially pressing a tapered sleeve together with a conductive metal pin into the opening of a tapered housing. This advantage is attributed to the material of the tapered sleeve, along with the inner and outer circumferential annular protrusions formed on it. Therefore, the tapered sleeve, formed of a rigid material, has a greater hardness than the conductive metal pin and the metal housing in which the housing opening is formed. Consequently, at least one inner and at least one outer circumferential annular protrusion induces localized deformation on the corresponding opposing metal surfaces during pressing, i.e., in the housing opening and on the conductive metal pin. This deformation, together with the self-locking effect of the tapered contact surface, forms a particularly leak-proof connection. Since this invention does not require adhesives or additional heat treatment steps, it saves costs and simplifies installation.

[0010] Crosslinked thermosetting plastics can be phenolic resin-based resins filled with rock powder that have been cured by thermal crosslinking, especially phenolic resins.

[0011] According to one embodiment, the conductive metal pin may have at least one annular protrusion along the tapered portion. Compared to a tapered sleeve, the at least one annular protrusion of the conductive metal pin is deformable on the surface of the tapered sleeve, thus further increasing the sealing performance under pressure.

[0012] The tapered contact surface of the tapered sleeve results in gapless alignment and a self-locking connection of the components. In an advantageous embodiment, the inner cone angle of the tapered sleeve can be steeper than the outer cone angle. For example, the tapered sleeve may have an outer cone with a ratio of 1:10, while the inner cone has a ratio of 1:7.5. The flatter outer cone with a ratio of 1:10 means that the tapered sleeve first moves relative to the housing opening and is firmly fixed within the housing opening under axial pressure. Only then does the steeper inner cone with a ratio of 1:7.5 take effect, causing the conductive metal pins to shift relative to the already fixed tapered sleeve. In this way, component tilting is avoided, the component is self-centered, and a defined preload is generated, which improves mechanical stability. Overall, installation becomes easier and thereby reduces the risk of incorrect positioning.

[0013] At least one inner circumferential annular protrusion and at least one outer circumferential annular protrusion may be configured to protrude from the surface of the tapered sleeve by no more than 100 μm. Preferably, at least one inner circumferential annular protrusion and at least one outer circumferential annular protrusion protrude from the surface of the tapered sleeve by at least 30 μm and at most 50 μm.

[0014] The annular protrusions of the tapered sleeve and at least one annular protrusion of the conductive metal pin can have a segmented cross-section. Due to the arcuate (segmented) shape, the contact force on the opposing surfaces is evenly distributed, which makes the seal more secure. Furthermore, the segmented design does not create any sharp edges that could potentially lead to localized high stress or material damage.

[0015] Alternatively, the circumferential annular protrusions on the inside and outside of the tapered sleeve can have a triangular cross-section formed in a wedge shape.

[0016] According to a preferred embodiment, the conical sleeve has exactly three inner circumferential annular protrusions and exactly three outer circumferential annular protrusions. This three-fold arrangement results in a uniform and stable distribution of force and contact, ensuring a tight seal.

[0017] Preferably, the circumferential annular protrusions of the conical sleeve are evenly spaced.

[0018] According to an advantageous embodiment, the inner and outer circumferential annular protrusions are each arranged along the longitudinal axis of the tapered sleeve such that they lie in the same cross-sectional plane, i.e., radially opposite. In this case, the deformation force acts in a radially cumulative manner, thus locally increasing the pressing effect of the tapered sleeve in the tapered housing opening and on the conductive metal pin. Axial offset of the inner and outer circumferential annular protrusions should be avoided to minimize the risk of destructive shear forces within the tapered sleeve.

[0019] For each of the above embodiments, at least one inner circumferential annular protrusion and at least one outer circumferential annular protrusion of the tapered sleeve may be configured to be formed in the central portion along the longitudinal axis of the tapered sleeve.

[0020] The present invention also relates to a method for installing an electrical feeder in a corresponding conical housing opening of an electric refrigerant compressor. The method is characterized by inserting a conductive metal pin into a conical sleeve and axially pressing the conductive metal pin and the conical sleeve together into the corresponding conical housing opening, wherein no additional binder or adhesive is used between the inner wall of the conical housing opening and the conical sleeve, or between the contact surfaces of the conductive metal pin and the conical sleeve. According to this method, the conical sleeve and the conductive metal pin are pressed against each other in the conical housing opening such that at least one inner circumferential annular protrusion and at least one outer circumferential annular protrusion of the conical sleeve are pressed into the opposing metal surfaces, thus achieving the required seal without the need for additional adhesives.

[0021] Furthermore, according to this method, the axial pressing assembly of the tapered sleeve and the conductive metal pins can be configured without undergoing any additional heat treatment. It has been found that the necessary sealing and durability are achieved without heat treatment.

[0022] Therefore, the installation of the electrical feeder according to the invention is performed simply by axially pressing the conductive metal pin together with the tapered sleeve into the opening of the tapered housing. Thus, additional process steps, such as the introduction of adhesives and subsequent heat treatment, are no longer required, resulting in savings in time and cost. Using the electrical feeder, the pressurized area is permanently and dielectrically separated from the area exposed to atmospheric pressure, while simultaneously enabling reliable power transmission to the housing, particularly the motor housing. Attached Figure Description

[0023] Further details, features, and advantages of embodiments of the present invention can be found in the following description of exemplary embodiments with reference to the associated drawings. In the drawings:

[0024] Figure 1 A schematic diagram of an electrical feeder according to the prior art is shown.

[0025] Figures 2a to 2d A schematic diagram of an exemplary embodiment of the tapered sleeve is shown.

[0026] Figure 3a / Figure 3b A schematic diagram of an exemplary embodiment of the electrical feeder according to the present invention is shown.

[0027] Figure 4 A schematic diagram showing details of the tapered sleeve, and

[0028] Figure 5 A schematic diagram illustrating an exemplary embodiment of a conductive metal pin is shown. Detailed Implementation

[0029] The term axial is used below to describe orientation or extent in the direction of a longitudinal axis or axis of rotation. The term radial is used to describe the direction of orientation outward from the relevant axis.

[0030] Figure 1 A schematic diagram of an electrical feeder 1 from a variant known in the prior art is shown. Each electrical feeder 1 has an electrically insulating conical sleeve 2 and a conductive metal pin 3. The conical sleeves 2 are characterized by their outer conical shape and inner conical shape. Figure 1 The diagram shows an electrical feeder 1 in its installed state within a conical housing opening in a motor housing 4. The housing opening is a conical hole corresponding to the external shape of a conical sleeve 2. Each conductive metal pin 3 has a conical portion 5 corresponding to the internal conical shape of the conical sleeve 2. A contact surface with the interior of the conical sleeve 2 is formed along the conical portion 5. According to the prior art, an epoxy resin adhesive is introduced between the contact surface of the conical sleeve 2 and the contact surface of the motor housing 4, and between the contact surface of the conical sleeve 2 and the contact surface of the conductive metal pin 3, respectively. To cure the epoxy resin adhesive, a time-consuming heat treatment can be provided, which is associated with additional costs.

[0031] Figure 2a and Figure 2b A schematic diagram of an exemplary embodiment of the conical sleeve 20 according to the present invention is shown, wherein, Figure 2a An external view of the tapered sleeve 20 is shown, and in which, Figure 2b A cross-sectional view of the tapered sleeve 20 is shown.

[0032] The tapered sleeve 20 has a tapered outer surface 21, wherein three peripheral annular protrusions 61, 62, and 63, in the form of sealing strips, are formed along the longitudinal direction of the tapered sleeve 20 in the central region. In the example shown, each of the peripheral annular protrusions 61, 62, and 63 protrudes 50 μm from the tapered outer surface 21 of the tapered sleeve 20. The arrangement of the peripheral annular protrusions 61, 62, and 63 is chosen such that each peripheral annular protrusion 61, 62, and 63 is evenly spaced. The distance between two adjacent peripheral annular protrusions 61, 62, and 63 is, in each case, greater than the axial extent of the peripheral annular protrusions 61, 62, and 63, i.e., greater than the width of the peripheral annular protrusions 61, 62, and 63.

[0033] Figure 2b It shows Figure 2aThe cross-sectional view of the tapered sleeve 20 shown allows observation of its interior. Inside, the tapered sleeve 20 has a tapered interior 22, which serves as a conductive metal pin 80 (see [reference]). Figure 3a or Figure 5 The seat portion of the tapered sleeve 20. Due to its tapered shape, the tapered sleeve 20 has axial openings of different sizes, wherein the larger opening is configured for introducing a conductive metal pin 80 (not shown). The opening for introducing the conductive metal pin 80 (not shown) is slightly chamfered.

[0034] On the conical interior 22 of the conical sleeve 20, three inner circumferential annular protrusions 71, 72, and 73 are formed at uniform intervals in the axial direction. The distance between two adjacent inner circumferential annular protrusions 71, 72, and 73 is, in each case, greater than the width of the inner circumferential annular protrusions 71, 72, and 73. The inner circumferential annular protrusions 71, 72, and 73 are configured to seal the conductive metal pin 80 (see...). Figure 3a or Figure 5 In the example shown, the inner circumferential annular protrusions 71, 72, and 73 each protrude 50 μm from the conical interior 22 of the conical sleeve 20.

[0035] Regarding the axial arrangement of the outer circumferential annular protrusions 61, 62, and 63, the inner circumferential annular protrusions 71, 72, and 73 are located together with the outer circumferential annular protrusions 61, 62, and 63 in a cross-sectional plane, such that the outer circumferential annular protrusions 61, 62, and 63 and the inner circumferential annular protrusions 71, 72, and 73 are radially opposite to each other.

[0036] The tapered sleeve 20 has an outer cone 23 and an inner cone 24, wherein the inner cone 24 is designed to receive the tapered portion 81 of the conductive metal pin 80 (see [reference]). Figure 3a or Figure 5 The angle of the inner cone 24 is steeper than the angle of the outer cone 23.

[0037] The outer circumferential annular protrusions 61, 62, and 63 and the inner circumferential annular protrusions 71, 72, and 73 each have a triangular cross-section in a wedge shape.

[0038] The tapered sleeve 20 is designed as a monolithic component made of a rigid body filled with rock powder cured by thermal cross-linking. Therefore, as... Figure 3a / Figure 3b As shown, the tapered sleeve 20 is formed of a material harder than the adjacent metal surfaces when the tapered sleeve 20 and the conductive metal pin 80 are pressed together into the tapered housing opening 90. Therefore, in the pressed state ( Figure 3a / Figure 3bThe metal surface of the conical housing opening 90 and the conical portion 81 of the conductive metal pin 80 are deformed in the areas of the outer circumferential annular protrusions 61, 62, 63 and the inner circumferential annular protrusions 71, 72, 73 formed on the surface of the conical sleeve 20, which helps to improve the sealing performance.

[0039] Figure 2c An enlarged view of a conical sleeve 20 with an outer circumferential annular protrusion 61 on the conical exterior 21 is shown. The wedge shape of the outer circumferential annular protrusion 61 can be seen.

[0040] Another cross-sectional view of the tapered sleeve 20 is shown in Figure 2d As shown in the image. Figure 2d An axial longitudinal section through the tapered sleeve 20 is shown, revealing the outer circumferential annular protrusions 61, 62, 63 formed on the outer circumferential shape of the outer cone 23 (outer circumferential shape) and the inner circumferential annular protrusions 71, 72, 73 formed on the inner circumferential shape of the inner cone 24 (inner circumferential shape). The outer circumferential annular protrusions 61, 62, 63 and the inner circumferential annular protrusions 71, 72, 73 are arranged radially oppositely on the tapered sleeve 20.

[0041] Figure 3a A schematic diagram of an exemplary embodiment of the electrical feeder 10 according to the present invention is shown. The electrical feeder 10 is shown as having a conical sleeve 20 and conductive metal pins 80 in an installed, pressed state in a conical housing opening 90 located in a metal housing 91 of an electrically powered refrigerant compressor. For better illustration, the design of the conical housing 20 is shown in a transparent manner and in conjunction with... Figures 2a to 2d Corresponding to the design shown, peripheral annular protrusions 61, 62, and 63 are formed on the conical outer surface 21. The electrical feeder 10 is configured for electrical contact of an electrical load encapsulated in the metal housing 91.

[0042] The conductive metal pin 80 has a cylindrical body with a tapered portion 81 along its longitudinal axis. The tapered portion 81 contacts the surface of the tapered interior 22 of the tapered sleeve 20, such that the tapered portion 81 completely fills the inner cone 24. For better illustration, the tapered portion 81 of the conductive metal pin 80 is shown in a transparent manner, allowing the inner cone 24 with inner circumferential annular protrusions 71, 72, and 73 to be seen. In the installed state, the inner circumferential annular protrusions 71, 72, and 73 are pressed into the surface of the tapered portion 81 of the conductive metal pin 80. Due to the contact force, the tapered portion 81 of the conductive metal pin 80 undergoes slight local deformation in the areas of the inner circumferential annular protrusions 71, 72, and 73, thus creating an improved seal between the tapered sleeve 20 and the conductive metal pin 80.

[0043] The inner protrusions 71, 72, 73 and the outer protrusions 61, 62, 63 are arranged on the tapered sleeve 20 and are not offset in the axial direction. Therefore, the arrangement of the outer circumferential annular protrusions 61, 62, 63 and the inner circumferential annular protrusions 71, 72, 73 makes the inner protrusions 71, 72, 73 and the outer protrusions 61, 62, 63 radially opposite to each other in their respective cases. For example, the outer circumferential annular protrusion 61 and the inner circumferential annular protrusion 71 are radially opposite to each other, and the outer circumferential annular protrusion 62 is radially opposite to the inner circumferential annular protrusion 72, and so on.

[0044] In the example shown, the outer circumferential annular protrusions 61, 62, and 63 press into the surface of the conical housing opening 90, thus creating an improved seal between the conical sleeve 20 and the conical housing opening 90. In general, the necessary seal is achieved through the interaction of the conductive metal pin 80 and the conical sleeve 20, wherein the radial contact pressures of the radially opposite inner circumferential annular protrusions 71, 72, and 73 and the outer circumferential annular protrusions 61, 62, and 63 are locally added at the contact surfaces.

[0045] Figure 3b An electrical feeder 10, comprising a tapered sleeve 20 and conductive metal leads 80, is shown in cross-section within a tapered housing opening 90 of a metal housing 91. Due to the axial length of the tapered sleeve 20, a portion of the outer cone 23 protrudes beyond the tapered housing opening 90. Peripheral annular protrusions 61, 62, 63 formed on the tapered exterior 21 of the outer cone 23 are arranged such that, in a pressed state, the peripheral annular protrusions 61, 62, 63 are axially located in the central portion of the tapered housing opening 90 relative to the wall thickness of the metal housing 91 at the tapered housing opening 90.

[0046] Figure 4 A schematic diagram showing details of the conical sleeve 20 in its installed state, located within the conical housing opening 90 of the metal housing 91, is illustrated. This is an enlarged view of the contact area between the surface of the conical housing opening 90 and the conical outer surface 21, where peripheral annular protrusions 61, 62, and 63 are formed on the conical outer surface 21. Due to contact pressure, the peripheral annular protrusions 61, 62, and 63 are pressed into the surface of the conical housing opening 90, thereby creating an additional sealing surface with increased contact pressure between the conical sleeve 20 and the conical housing opening 90.

[0047] Figure 5 A schematic diagram of an exemplary embodiment of a conductive metal pin 80 is shown. In the example shown, the conductive metal pin 80 has an outer circumferential annular protrusion 82 in the tapered portion 81. This protrusion is formed of the material of the conductive metal pin 80 and is therefore larger than the tapered sleeve 20 (see, for example...). Figures 2a to 2dThe rigid material is soft. Therefore, when the conductive metal pin 80 is introduced into the tapered sleeve 20, the outer circumferential annular protrusion 82 deforms in the contact area on the inner tapered part 22, which results in an additional sealing effect.

[0048] The axial position of the outer circumferential annular protrusion 82 on the tapered portion 81 is selected such that, when the conductive metal pin 80 is in the mounted state, the outer circumferential annular protrusion 82 lies in the same plane as one of the annular protrusions 61, 62, 63, 71, 72, 73 of the tapered sleeve 20 in the axial direction. The outer circumferential annular protrusion 82 preferably has a segmented shape in cross-section. Due to the arcuate (segmented) shape, the contact force on opposite surfaces is evenly distributed, resulting in a stronger seal.

[0049] According to another embodiment (not shown here), the conductive metal pin 80 may have exactly three evenly spaced annular protrusions 82 on the tapered portion 81. These spaced annular protrusions 82 are arranged such that, when in the installed state, they lie in the same plane as the inner circumferential annular protrusions 71, 72, 73 and the outer circumferential annular protrusions 61, 62, 63 of the tapered sleeve 20. List of reference numerals 1 Electrical feeder 2 conical sleeves 3 conductive metal pins 4 Motor housing 5 cone-shaped sections 10 electrical feeders 20 tapered sleeve 21 Conical exterior 22 cone-shaped interior 23 outer cone 24 inner cone 61, 62, 63 circumferential annular protrusions 71, 72, 73 Inner circumferential annular protrusions 80 conductive metal pins 81 Conical section 82 peripheral annular protrusion 90-degree conical shell opening 91 Metal Casing

Claims

1. An electrical feeder (10) for use as an encapsulated electrical component in an air conditioning system, particularly in an electric refrigerant compressor of a vehicle air conditioning system, particularly in an electric R744 refrigerant compressor, the electrical feeder (10) having a conical sleeve (20) and conductive metal leads (80), the conical sleeve (20) and the conductive metal leads (80) being pressed into corresponding conical housing openings (90) in a metal housing, wherein, The conductive metal pin (80) has a tapered portion (81) corresponding to the inner cone angle of the tapered sleeve (20), wherein the tapered sleeve (20) is formed of cross-linked thermosetting plastic and has at least one inner circumferential annular protrusion (71, 72, 73) and at least one outer circumferential annular protrusion (61, 62, 63), the inner circumferential annular protrusion (71, 72, 73) and the outer circumferential annular protrusion (61, 62, 63) forming a circumferential sealing press fit in the tapered housing opening (90), wherein no additional binder or connector is introduced between the inner wall of the tapered housing opening (90) and the tapered sleeve (20) or between the contact surface of the conductive metal pin (80) and the contact surface of the tapered sleeve (20).

2. The electrical feeder (10) according to claim 1, characterized in that, The cross-linked thermosetting plastic forming the conical sleeve (20) is a phenolic resin-based resin, particularly a phenolic resin, filled with rock powder and cured by thermal cross-linking.

3. The electrical feeder (10) according to any one of claims 1 or 2, characterized in that, The inner cone angle of the conical sleeve (20) is steeper than the outer cone angle of the conical sleeve (20).

4. The electrical feeder (10) according to any one of claims 1 to 3, characterized in that, The at least one inner circumferential annular protrusion (71, 72, 73) and the at least one outer circumferential annular protrusion (61, 62, 63) protrude from the surface of the conical sleeve (20) by no more than 100 μm, preferably at least 30 μm and at most 50 μm.

5. The electrical feeder (10) according to any one of claims 1 to 4, characterized in that, The conductive metal pin (80) is formed of metal and has at least one outer circumferential annular protrusion (82) along the tapered portion (81).

6. The electrical feeder (10) according to any one of claims 1 to 5, characterized in that, The annular protrusions (61, 62, 63, 71, 72, 73) of the tapered sleeve (20) and at least one annular protrusion (82) of the conductive metal pin (80) have a segmented cross-section.

7. The electrical feeder (10) according to any one of claims 1 to 5, characterized in that, The annular protrusions (61, 62, 63, 71, 72, 73) of the conical sleeve (20) have a triangular cross-section formed in a wedge shape.

8. The electrical feeder (10) according to any one of claims 1 to 7, characterized in that, The conical sleeve (20) has exactly three inner circumferential annular protrusions (71, 72, 73) and exactly three outer circumferential annular protrusions (61, 62, 63).

9. The electrical feeder (10) according to claim 8, characterized in that, The inner circumferential annular protrusions (71, 72, 73) and the outer circumferential annular protrusions (61, 62, 62) of the conical sleeve (20) are evenly spaced apart.

10. The electrical feeder (10) according to claim 8 or 9, characterized in that, The inner circumferential annular protrusions (71, 72, 73) and the outer circumferential annular protrusions (61, 62, 63) of the tapered sleeve (20) are arranged in a radially superimposed manner along the longitudinal axis of the tapered sleeve (20).

11. The electrical feeder (10) according to any one of claims 1 to 10, characterized in that, The at least one inner circumferential annular protrusion (71, 72, 73) and the at least one outer circumferential annular protrusion (61, 62, 63) of the tapered sleeve (20) are formed in the central portion along the longitudinal axis of the tapered sleeve (20).

12. A method for installing an electrical feeder (10) according to any one of claims 1 to 11 in a corresponding conical housing opening (90) of an electric refrigerant compressor, characterized in that, The conductive metal pin (80) is inserted into the tapered sleeve (20), and the conductive metal pin (80) and the tapered sleeve (20) are pressed together into the corresponding tapered housing opening (90) by applying axial pressure, wherein no additional binder or connector is used between the inner wall of the tapered housing opening (90) and the tapered sleeve (20) or between the contact surface of the conductive metal pin (80) and the contact surface of the tapered sleeve (20).

13. The method according to claim 12, characterized in that, The axial pressing assembly consisting of the tapered sleeve (20) and the conductive metal pin (80) is not subjected to any additional heat treatment.

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