Subassembly of a refrigeration compressor and method for assembling an electric motor in an intermediate casing of a refrigeration compressor

Abstract

The subassembly (27) comprises an intermediate casing (4) having a central longitudinal axis (A); a stator assembly (28) located inside the intermediate casing (4); a power connector (29) attached to the intermediate casing (4) and configured to be electrically connected to an external power source; and an intermediate power wire (31) attached to an inner surface of the intermediate casing (4) and comprising an upper end portion and a lower end portion that are axially offset from each other, the power connector (29) being removably connected to a lower end winding (22) of the stator assembly (28) by means of the intermediate power wire (31). Figure 2

Description

Title of the invention: Subassembly of a refrigeration compressor and method for assembling an electric motor in an intermediate casing of a refrigeration compressor. Field of the invention

[0001] The present invention relates to a sub-assembly of a refrigeration compressor and to a method of assembling an electric motor in an intermediate casing of a refrigeration compressor. State of the art

[0002] Refrigeration compressors, for example scroll compressors, having electric motors are well known in the art. An electric motor of a compressor is generally located inside a compressor housing, usually in an intermediate casing, and is powered by electricity supplied from outside the compressor.

[0003] The compressor assembly process requires that an electric motor stator be mounted inside an intermediate housing of the compressor. Once the stator is placed inside the intermediate housing, a harness, being an integral terminal part of a stator conductor wire, must be plugged directly into a power connector, which is soldered onto the intermediate housing.

[0004] The location of the power connector on the intermediate casing is predetermined by the location of an electrical enclosure required by the compressor user. For example, the electrical enclosure must be located at a certain height to allow for easy and convenient connection to the external power source.

[0005] Similarly, the location of the stator conductor wire is predetermined by the compressor assembly process. In the case of a hermetic scroll compressor, the stator conductor wire must be easily accessible before welding the intermediate casing to a base plate. Therefore, the stator conductor wire must be located at the lower end winding, and the stator assembly in the intermediate casing is carried out upside down.

[0006] The above presents two mutually conflicting location requirements for a power connector on an intermediate enclosure: on the one hand, the power connector must be as high as possible (in order to allow easy handling for a compressor user), on the other hand, the power connector must be as low as possible (in order to allow an easy and reliable assembly process).

[0007] One design for scroll compressors is the so-called "tube-in-tube" design, where an electric motor is pre-assembled in a stator tube and then attached to a compression stage of the compressor. The entire subassembly is then inserted into the intermediate casing. The "tube-in-tube" design is particularly useful when the outside diameter of a compressor's compression stage is much larger than the diameter of the motor.

[0008] Currently, in order to assemble the stator with the intermediate casing, an operator at an assembly station must first place the intermediate casing over an inverted internal assembly to access the lower end winding and thus the stator conductor wire with the harness. The operator then connects the harness to the power connector. Because the power connector is some distance from the lower end winding, this process is carried out with minimal visibility and accessibility, creating two main problems. The first is related to a very awkward manual operation for the operator, which, repeated several times a day for a year, can lead to a risk of musculoskeletal disorders.The second is the limited reliability of this assembly process and the potentially high risk of a poor connection that can only be detected when the assembly is fully completed (i.e., once the compressor is welded).

[0009] Furthermore, this process is not suitable for automation because the available space is very limited and it is not possible to ensure repeatable positioning of the various parts during this operation. An automated process would require solutions that are too expensive and incompatible with the compressor's value. The current process is also very time-consuming.

[0010] This manufacturing process for scroll compressors has been used for decades. According to current knowledge, this process presents a high risk to the operator's elbows, neck, and shoulders. Therefore, there is a significant and long-standing need to improve it.

[0011] Document JP2006029251A describes a hermetic scroll compressor with An electric motor and a power connector located at a certain height on an intermediate housing. In the said document, a stator lead wire is connected to an upper end winding of a stator. However, although this design may be considered easier to assemble, it has lower potential for parts reuse and is not as advantageous for large compressors (i.e., compressors with compression stages whose dimensions are larger than those of electric motors). Summary of the invention

[0012] The object of the present invention is to provide an improved sub-assembly of a refrigeration compressor and a method of assembling a stator assembly in an intermediate casing of a refrigeration compressor which can overcome the disadvantages encountered in conventional compressors.

[0013] In particular, an object of the present invention is to provide a sub-assembly of a refrigeration compressor which ensures a reliable assembly of a stator inside an intermediate casing, is convenient for a manual assembly operation and can allow automation of at least some steps of the assembly process.

[0014] To this end, the present invention relates to a subassembly of a refrigeration compressor, the subassembly comprising an intermediate casing having a central longitudinal axis, a stator assembly located inside the intermediate casing, and a power connector attached to the intermediate casing and configured to be electrically connected to an external power source on one side and to the stator assembly on the other side, the subassembly further comprising an intermediate electrical wire attached to an interior surface of the intermediate casing (i.e. the surface of the intermediate casing which faces an interior space of the intermediate casing where the stator assembly is located), the intermediate electrical wire comprising an upper end portion and a lower end portion which are axially offset from each other,and the power connector being removably connected to a lower end winding of the stator assembly via the intermediate electrical wire.

[0015] Such a configuration of the subassembly according to the present invention ensures that the assembly process of the stator assembly can be carried out practically, repeatably, and reliably. The manual operation for the operator at the assembly station is simplified, and the impact on the operator's health is considerably reduced compared to the prior art solution. Furthermore, a connection between the stator assembly and the power connector can be easily checked to detect any faults, thus helping to reduce the risk of assembly defects. Finally, the assembly time and production cost of a compressor comprising this subassembly are considerably reduced.

[0016] The subassembly according to the present invention is mainly usable for spiral compressors of so-called "tube in tube" design.

[0017] The subset may also include one or more of the following features, taken alone or in combination.

[0018] According to one embodiment of the invention, the intermediate electrical wire, and in particular the upper end part of the intermediate electrical wire, is electrically connected to the power connector.

[0019] According to one embodiment of the invention, the stator assembly comprises a stator including a stator core, also called a stator stack, and stator windings wound on the stator core, the stator windings defining an upper end winding, also called the upper winding head, and a lower end winding, also called the lower winding head. In particular, the upper end winding is formed by portions of the stator windings extending outwards from an upper end face of the stator core, and the lower end winding is formed by portions of the stator windings extending outwards from a lower end face of the stator core.

[0020] According to one embodiment of the invention, the stator assembly comprises a stator tube surrounding the stator and in which the stator is at least partially arranged. The stator can be fixed to the stator tube, for example by press fitting, shrink fitting, welding, screwing, or by other suitable methods.

[0021] According to one embodiment of the invention, the stator tube comprises an upper tube portion configured to be fixed to a support element belonging to the refrigeration compressor and provided with an upper bearing, and a lower tube portion configured to be fixed to a lower bearing belonging to the refrigeration compressor. In particular, the lower bearing and the upper bearing are configured to support the rotation of a drive shaft of the refrigeration compressor.

[0022] According to one embodiment of the invention, the intermediate electrical wire extends substantially parallel to the central longitudinal axis of the intermediate envelope.

[0023] According to one embodiment of the invention, the upper end portion and the lower end portion of the intermediate electrical wire have the same angular position relative to the central longitudinal axis of the intermediate sheath. In other words, the upper end portion and the lower end portion of the intermediate electrical wire are connected on a surface of the intermediate sheath by a straight line.

[0024] According to one embodiment of the invention, the upper end portion and the lower end portion of the intermediate electrical wire have different angular positions with respect to the central longitudinal axis of the intermediate sheath. In other words, the upper end portion and the lower end portion of the intermediate electrical wire are connected on a surface of the intermediate sheath by a curved line.

[0025] According to one embodiment of the invention, the intermediate electrical wire extends in a spiral around the central longitudinal axis of the intermediate envelope.

[0026] According to one embodiment of the invention, the intermediate electrical wire is fixed to the inner surface of the intermediate envelope by means of a fixing device.

[0027] According to one embodiment of the invention, the fastening device comprises an upper fastening element and a lower fastening element which are axially offset from each other and which are configured to fix respectively the upper end part and the lower end part of the intermediate electrical wire to the inner surface of the intermediate sheath.

[0028] According to one embodiment of the invention, the stator assembly has a first electrical connector electrically connected to the lower end winding of the stator assembly, and the intermediate electrical wire has a second electrical connector, in which the first and second electrical connectors are removably connected to each other.

[0029] According to one embodiment of the invention, the lower end portion of the intermediate electrical wire comprises the second electrical connector.

[0030] According to one embodiment of the invention, the first electrical connector is a male or female electrical connector and the second electrical connector is respectively a female or male electrical connector.

[0031] According to one embodiment of the invention, the male electrical connector has a male connecting portion that extends axially and the female electrical connector has a female connecting portion that extends axially. For example, the male connecting portion may extend upwards and the female connecting portion may extend downwards, or vice versa.

[0032] According to one embodiment of the invention, the male electrical connector has a male connection portion that extends at least partially radially, and advantageously substantially radially, and more advantageously entirely radially, and the female electrical connector has a female connection portion that extends at least partially radially, and advantageously substantially radially, and more advantageously entirely radially. For example, the male connection portion may be directed inwards (i.e., towards the stator assembly) or may be directed outwards (i.e., towards the intermediate casing).

[0033] According to one embodiment of the invention, the first electrical connector is directly connected to the lower end winding of the stator assembly.

[0034] According to one embodiment of the invention, the first electrical connector is firmly fixed to a stator tube of the stator assembly.

[0035] According to one embodiment of the invention, the first and second electrical connectors are configured to be plugged substantially radially into each other.

[0036] According to one embodiment of the invention, the first and second electrical connectors are configured to be inserted substantially axially into one another. Such an embodiment of the present invention is particularly preferred for automating the assembly process. Indeed, according to such an embodiment, the intermediate casing can be assembled to an internal subassembly including the stator assembly by lowering the intermediate casing onto said internal subassembly (or by inserting the internal subassembly inside the intermediate casing), and the connection between the first and second electrical connectors can be made automatically without requiring any further manual operation.

[0037] According to one embodiment of the invention, the first electrical connector is electrically connected to the lower end winding of the stator assembly by means of a conducting wire.

[0038] According to one embodiment of the invention, the conductor wire has a first wire end part electrically connected to the lower end winding of the stator assembly and a second wire end part electrically connected to the first electrical connector.

[0039] According to one embodiment of the invention, the first electrical connector is located at a distance and outside the stator tube of the stator assembly.

[0040] According to one embodiment of the invention, the second electrical connector is attached to the intermediate casing.

[0041] According to one embodiment of the invention, when the subassembly is in its operating configuration and extended vertically, the power connector is located at a higher position than the lower end winding of the stator assembly. Advantageously, when the subassembly is in its operating configuration and extended vertically, the power connector is located substantially at the same height as an upper end winding of the stator assembly or at a higher position than the upper end winding of the stator assembly.

[0042] According to one embodiment of the invention, the intermediate electrical wire is formed in one piece with the power connector.

[0043] According to one embodiment of the invention, the intermediate electrical wire is removably connected to the power connector.

[0044] The present invention also relates to a spiral compressor comprising a sub-assembly according to the present invention.

[0045] The present invention further relates to a method of assembling a stator assembly in an intermediate casing of a refrigeration compressor, for example a scroll compressor, the method comprising the following steps:

[0046] - the provision of the intermediate casing to which a connector is attached power supply and an intermediate electrical wire, the intermediate electrical wire being attached to an inner surface of the intermediate enclosure and being electrically connected to the power connector,

[0047] - the installation of the stator assembly in the intermediate housing,

[0048] - the connection of a lower end winding of the stator assembly to intermediate electrical wire.

[0049] According to one embodiment of the invention, the step of connecting the lower end winding of the stator assembly to the intermediate electric wire occurs substantially in a radial direction, and for example in a radial direction, with respect to a central longitudinal axis of the intermediate envelope.

[0050] According to one embodiment of the invention, the step of connecting the lower end winding of the stator assembly to the intermediate electric wire occurs substantially in an axial direction, and for example in a radial direction, with respect to a central longitudinal axis of the intermediate envelope.

[0051] According to one embodiment of the invention, the process is at least partially automated. Advantageously, the step of connecting the lower end winding of the stator assembly to the intermediate electrical wire is automated. During this step, an operator has very limited access, and therefore this process is difficult to control. Automating this step is thus very beneficial in terms of reducing the scrap rate. More advantageously, the process is fully automated.

[0052] The present invention also relates to a process for assembling a hermetic spiral compressor, the process comprising the method according to the present invention. Brief description of the drawings

[0053] The following detailed description of several embodiments of the invention is best understood when read in conjunction with the accompanying drawings, it being understood, however, that the invention is not limited to the specific embodiments described.

[0054] Fig. 1 is a longitudinal cross-sectional view of a spiral compressor according to a first embodiment of the invention.

[0055] Fig. 2 is a schematic longitudinal cross-sectional view of a sub-assembly of the spiral compressor of Fig. 1, showing the sub-assembly before assembly.

[0056] Fig. 3 is a schematic longitudinal cross-sectional view of the sub-assembly of Fig. 2, showing the sub-assembly after assembly.

[0057] Fig. 4 is a schematic longitudinal cross-sectional view of a sub-assembly of a refrigeration compressor according to a second embodiment of the invention.

[0058] Figure 5 is a schematic longitudinal cross-sectional view of a subassembly of a refrigeration compressor according to a third embodiment of the invention. Detailed description of the invention

[0059] Unless otherwise specified, the term "substantially" means, in this document, "exactly or within 10% or 10°". For example, "substantially parallel" means "parallel" or "inclined at an angle of 10°".

[0060] Fig. 1 shows a refrigeration compressor 2, and for example a hermetic scroll compressor, comprising a hermetic casing 3 including an intermediate jacket 4, an upper cap 5 and a base plate 6. The intermediate jacket 4 includes an upper end closed by the upper cap 5 and a lower end closed by the base plate 6. Advantageously, the intermediate jacket 4 is cylindrical and has a central longitudinal axis A.

[0061] The refrigeration compressor 2 further includes a refrigerant suction inlet 7 provided on the intermediate casing 4 and configured to supply the refrigeration compressor 2 with refrigerant to be compressed, and a discharge outlet 8 configured to discharge the compressed refrigerant. For example, the discharge outlet 8 may be provided on the upper cap 5.

[0062] The refrigeration compressor 2 also includes a support element 9 arranged inside the hermetically sealed housing 3 and fixed to the hermetically sealed housing 3, and a compression unit 11 also arranged inside the hermetically sealed housing 3 and disposed above the support frame 9. The compression unit 11 is configured to compress the refrigerant supplied by the refrigerant suction inlet 7, and includes a fixed spiral 12, which is fixed relative to the hermetically sealed housing 3, and an orbiting spiral 13 supported by and in sliding contact with a thrust bearing surface 14 provided on the support frame 9.

[0063] Furthermore, the refrigeration compressor 2 includes a drive shaft 15 configured to drive the orbiting spiral 13 in an orbital motion, and an electric motor 16, which may be a variable speed electric motor, coupled to the drive shaft 15 and configured to drive the drive shaft 15 in rotation about an axis of rotation collinear with the central longitudinal axis A.

[0064] The electric motor 16 has a rotor 17 fitted onto the drive shaft 15, and a stator 18 arranged around the rotor 17. The stator 18 comprises a stator stack or stator core 19, and stator windings wound on the stator core 19. The stator windings define an upper end winding 21 which is formed by the portions of the stator windings extending outwards from an upper end face of the stator core 19 which is oriented towards the compression unit 11, and a lower end winding 22 which is formed by the portions of the stator windings extending outwards from a lower end face of the stator core 19 which is opposite the compression unit 11.

[0065] According to the first embodiment of the invention, the refrigeration compressor 2 further comprises a stator tube 23 surrounding the stator 18 and in which the electric motor 16 is mounted at least partially, and for example entirely. However, according to another embodiment of the invention, the refrigeration compressor 2 may be devoid of such a stator tube 23.

[0066] According to the embodiment shown in the figures, an upper end of the stator tube 23 is fixed to the support element 9, and a lower end of the stator tube 23 is fixed to a centering element 24 fixed to the intermediate casing 4. The stator 18 can be fixed to the stator tube 23, for example by press fitting, shrink fitting, welding, screwing or other suitable methods.

[0067] The refrigeration compressor 2 further includes an upper bearing 25 provided on the support element 9 and configured to cooperate with an external circumferential wall surface of an upper end portion of the drive shaft 15, and a lower bearing 26 provided on the centering element 24 and configured to cooperate with an external circumferential wall surface of a lower end portion of the drive shaft 15. The lower bearing 26 and the upper bearing 25 are particularly configured to support the rotation of the drive shaft 15.

[0068] Figure 2 shows a subassembly 27 of the refrigeration compressor 2. The subassembly 27 comprises the intermediate casing 4 and a stator assembly 28 located inside the intermediate casing 4 and partially forming the electric motor 16. According to the first embodiment of the invention, the stator assembly 28 particularly comprises the stator 18 and may include the stator tube 23 if the refrigeration compressor 2 is equipped with such a stator tube 23. Advantageously, the stator assembly 28 is attached to the intermediate casing 4 by means of the stator tube 23 and the support element 9 (if the refrigeration compressor 2 is equipped with such a stator tube 23) or directly by means of the support element 9.

[0069] The subassembly 27 also includes a power connector 29 which is attached to the intermediate casing 4 and which is configured to be electrically connected to an external power source in order to deliver electrical power to the refrigeration compressor 2 in a sealed manner, and an intermediate electrical wire 31 which is attached to an inner surface of the intermediate casing 4 and which is electrically connected to the power connector 29. The power connector 29 can, for example, be welded to the intermediate casing 4.

[0070] Advantageously, when the refrigeration compressor 2 is in an operating configuration and extends vertically, the power connector 29 is located substantially at the same height as the upper end winding 21 of the stator 18 or at a higher position than the upper end winding 21 of the stator 18. According to one embodiment of the invention, the intermediate electrical wire 31 is formed as a single piece with the power connector 29. However, according to another embodiment of the invention, the intermediate electrical wire 31 can be removably connected to the power connector 29.

[0071] The intermediate electrical wire 31 includes, in particular, an upper end portion electrically connected to the power connector 29 and a lower end portion that is axially offset from the upper end portion. Advantageously, the intermediate electrical wire 31 extends substantially parallel to the central longitudinal axis A of the intermediate sheath 4 and is fixed to the inner surface of the intermediate sheath 4 by means of a fastening device. The fastening device may include an upper fastening element 32 and a lower fastening element 33 that are axially offset from each other and are configured to fix the upper and lower ends of the intermediate electrical wire 31 to the inner surface of the intermediate sheath 4, respectively.The lower fixing element 33 may be in the form of an eyelet, and the upper and lower fixing elements 33 could, for example, be welded to the intermediate casing 4.

[0072] According to the first embodiment of the invention, the upper end portion and the lower end portion of the intermediate electrical wire 31 have the same angular position relative to the central longitudinal axis A of the intermediate sheath 4. However, according to another embodiment of the invention, the intermediate electrical wire 31 could extend in a spiral around the central longitudinal axis A of the intermediate sheath 4, and the upper end portion and the lower end portion of the intermediate electrical wire 31 could thus have different angular positions relative to the central longitudinal axis A of the intermediate sheath 4.

[0073] As shown in Figures 2 and 3, the power connector 29 is removably connected to the lower end winding 22 of the stator assembly 28 by means of the intermediate electrical wire 31. For this purpose, the stator assembly 28 has a first electrical connector 34 electrically connected to the lower end winding 22 of the stator assembly 28, and the lower end portion of the intermediate electrical wire 31 has a second electrical connector 35 which is removably connected to the first electrical connector 34.

[0074] The first electrical connector 34 may be a male or female electrical connector, and the second electrical connector 35 may be a female or male electrical connector, respectively. According to the first embodiment of the invention, the first electrical connector 34 is a male electrical connector, and the second electrical connector 35 is a female electrical connector.

[0075] According to the first embodiment of the invention, the first electrical connector 34 is located at a distance and outside the stator tube 23 of the stator assembly 28, and the stator assembly 28 comprises a conductive wire 36 electrically connected to the lower end winding 22 of the stator assembly 28, and the first electrical connector 34 is electrically connected to the lower end winding 22 of the stator assembly 28 by means of the conductive wire 36. In particular, the conductive wire 36 has a first wire end portion connected to the lower end winding 22 of the stator assembly 28 and a second wire end portion connected to the first electrical connector 34.

[0076] A method for assembling the stator assembly 28 in the intermediate casing 4 of the refrigeration compressor 2 according to the first embodiment of the invention may comprise the following steps:

[0077] - the supply of the intermediate casing 4 to which the connector is attached power supply 29 and intermediate electrical wire 31,

[0078] - the installation of the stator assembly 28 in the intermediate housing 4, and

[0079] - the connection of the lower end winding 22 of the stator assembly 28 to the intermediate electrical wire 31 via the first and second electrical connectors 34, 35.

[0080] Advantageously, said process can be at least partially automated.

[0081] Figure 4 describes a subassembly 27 of a refrigeration compressor 2 according to a second embodiment of the invention which differs from the first embodiment shown in Figures 1 to 3 essentially in that the second electrical connector 35 is attached to the intermediate casing 4 by means of the lower fixing element 33 and in that the first electrical connector 34 is securely fixed to the stator tube 23 of the stator assembly 28.

[0082] According to the second embodiment of the invention, the first and second electrical connectors 34, 35 are configured to be radially inserted into one another. For this purpose, the first electrical connector 34 has a female connection portion 34.1 which extends substantially radially, and advantageously entirely radially, and the second electrical connector 35 has a male connection portion 35.1 which extends substantially radially, and advantageously entirely radially, and which is directed inwards (i.e. towards the stator assembly 28).

[0083] Figure 5 describes a subassembly 27 of a refrigeration compressor 2 according to a third embodiment of the invention which differs from the second embodiment shown in Figure 4 essentially in that the first and second electrical connectors 34, 35 are configured to be axially inserted into one another. To this end, the first electrical connector 34 has a female connection portion 34.1 which extends axially and downwards, and the second electrical connector 35 has a male connection portion 35.1 which extends axially and upwards.

[0084] Such an embodiment of the present invention is particularly preferred for automating the assembly process of a refrigeration compressor. Indeed, according to such an embodiment, the intermediate casing 4 can be assembled to an internal subassembly including the stator assembly 28 by lowering the intermediate casing 4 onto said internal subassembly (or by inserting the internal subassembly inside the intermediate casing 4), and the connection between the first and second electrical connectors 34, 35 can be ensured automatically without requiring any other manual operation.

[0085] According to said third embodiment of the invention, the second electrical connector 35 is fixed to the intermediate casing 4 by means of a lower fixing element 33 in the form of two eyelets in order to ensure better and more reliable positioning of the second electrical connector 35.

[0086] Of course, the invention is not limited to the embodiments described above by way of non-limiting examples, but on the contrary encompasses all embodiments.

Claims

Demands

1. Subassembly (27) of a refrigeration compressor (2), the subassembly (27) comprising an intermediate casing (4) having a central longitudinal axis (A), a stator assembly (28) located inside the intermediate casing (4), and a power connector (29) attached to the intermediate casing (4) and configured to be electrically connected to an external power source and to the stator assembly (28), characterized in that the subassembly (27) further comprises an intermediate electrical wire (31) attached to an inner surface of the intermediate casing (4), the intermediate electrical wire (31) comprising an upper end portion and a lower end portion which are axially offset from each other, and in that the power connector (29) is removably connected to a lower end winding (22) of the stator assembly (28) by means of the intermediate electrical wire (31).

2. Subassembly (27) according to claim 1, wherein the intermediate electric wire (31) extends substantially parallel to the central longitudinal axis (A) of the intermediate envelope (4).

3. Subassembly (27) according to claim 1 or 2, wherein the intermediate electrical wire (31) is fixed to the inner surface of the intermediate envelope (4) by means of a fixing device.

4. Subassembly (27) according to claim 3, wherein the fastening device comprises an upper fastening element (32) and a lower fastening element (33) which are axially offset from each other and which are configured to fix respectively the upper end portion and the lower end portion of the intermediate electrical wire (31) to the inner surface of the intermediate sheath (4).

5. Subassembly (27) according to any one of claims 1 to 4, wherein the stator assembly (28) has a first electrical connector (34) electrically connected to the lower end winding (22) of the stator assembly (28), and the intermediate electrical wire (31) has a second electrical connector (35), wherein the first and second electrical connectors (34, 35) are removably connected to each other.

6. Subassembly (27) according to claim 5, wherein the first electrical connector (34) is a male or female electrical connector and the second electrical connector (35) is respectively a female or male electrical connector.

7. Subassembly (27) according to claim 5 or 6, wherein the first electrical connector (34) is directly connected to the lower end winding (22) of the stator assembly (28).

8. Subassembly (27) according to any one of claims 5 to 7, wherein the first electrical connector (34) is firmly fixed to a stator tube (23) of the stator assembly (28).

9. Subassembly (27) according to claim 8, wherein the first and second electrical connectors (34, 35) are configured to be plugged substantially radially into each other.

10. Subassembly (27) according to claim 8, wherein the first and second electrical connectors (34, 35) are configured to be inserted substantially axially into each other.

11. Subassembly (27) according to claim 5 or 6, wherein the first electrical connector (34) is electrically connected to the lower end winding (22) of the stator assembly (28) by means of a conducting wire (36).

12. Subassembly (27) according to any one of claims 5 to 11, wherein the second electrical connector (35) is attached to the intermediate housing (4).

13. Spiral compressor comprising a subassembly (27) according to any one of claims 1 to 12.

14. Method of assembling a stator assembly (28) in an intermediate casing (4) of a refrigeration compressor (2), the method comprising the following steps: - supplying the intermediate casing (4) to which are attached a power connector (29) and an intermediate electrical wire (31), the intermediate electrical wire (31) being attached to an inner surface of the intermediate casing (4) and being electrically connected to the power connector (29), - placing the stator assembly (28) in the intermediate casing (4),

15.

16.

17.

18. - the connection of a lower end winding (22) of the stator assembly (28) to the intermediate electrical wire (31). Method according to claim 14, wherein the step of connecting the lower end winding (22) of the stator assembly (28) to the intermediate electric wire (31) occurs substantially in a radial direction with respect to a central longitudinal axis (A) of the intermediate envelope (4). Method according to claim 14, wherein the step of connecting the lower end winding (22) of the stator assembly (28) to the intermediate electric wire (31) occurs substantially in an axial direction with respect to a central longitudinal axis (A) of the intermediate envelope (4). A method according to any one of claims 14 to 16, wherein the method is at least partially automated. Assembly process of a hermetic spiral compressor, the process comprising the method according to any one of claims 14 to 17.

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