High-speed compartmentalized compressor including a cooling system for the pivoting mechanism of said compressor

Abstract

COMPARTMENTED HIGH-SPEED COMPRESSOR INCLUDING A COOLING SYSTEM FOR THE PIVOTORY OF SAID COMPRESSOR The invention relates to a high-speed compressor comprising a casing and at least one refrigerant circulation channel, a plurality of pivoting elements, said compressor being characterized in that it comprises a plurality of coaxial compartments hermetically connected to each other to form the body of said casing, each compartment comprising respectively: a plurality of bores configured to form said at least one refrigerant circulation channel by alignment of said plurality of compartments a pivoting element of said plurality of pivoting elements;and in that at least one compartment of said plurality of compartments, said regulated compartment, further comprises a heat transfer system arranged in the vicinity of a pivoting element of said regulated compartment, said heat transfer system comprising a heat exchanger configured to provide heat transfer between said pivoting element in the vicinity of which it is arranged and said at least one refrigerant circulation channel. Figure for the abbreviation: Figure 1;

Description

Title of the invention: Compartmentalized high-speed compressor comprising A COOLING SYSTEM FOR THE SWIVEL MOUNT OF SAID COMPRESSOR Technical field of the invention

[0001] The invention relates to the field of compressors. More specifically, the invention concerns a compartmentalized high-speed compressor comprising a cooling system dedicated to the pivoting mechanism of said compressor. Technological background

[0002] In steam cooling systems equipped with motorized positive displacement compressors, the cooling of the motor is ensured by a direct circulation of the refrigerant fluid around the motor and the pivoting elements before the refrigerant is drawn in for compression.

[0003] In the case of a high-speed compressor, such as a centrifugal or screw compressor, the pivoting elements constitute a source of heat requiring cooling. However, for such compressors, this cooling solution is not suitable, particularly due to the compact size of the pivoting elements, such as the bearings and gas thrust bearings for centrifugal compressors, or the roller bearings for screw compressors.

[0004] Indeed, the direct circulation of refrigerant around the aforementioned pivoting elements results in significant pressure losses. Furthermore, the compactness of these elements does not allow for the exchange surface area necessary for direct contact cooling of the refrigerant in vapor form, which is prohibitive for the cooling capacity of the fluid and the overall coefficient of performance of the cooling cycle.

[0005] In addition, circulating refrigerant directly around the motor is not suitable for high-speed compressors due to the increased energy consumption of the compressor to achieve satisfactory cooling.

[0006] High-speed compressors are generally cooled by injecting liquid refrigerant, which significantly impacts the overall cycle performance. Furthermore, this solution makes the system more complex, notably requiring refrigerant flow control valves.

[0007] There are high-speed compressors using one or more air streams for cooling components and various pivoting elements.

[0008] In these known compressors, a first airflow feeds the compression wheel and, at the outlet of this wheel, a major part of the outlet flow provides the main outlet airflow of the compressor and a leakage flow from this first airflow forms a second cooling airflow intended to circulate between the bearings and the shaft of the compressor.

[0009] These arrangements are not entirely satisfactory, however, because they do not allow for targeted and efficient cooling of each element of the high-speed compressor pivot. Furthermore, known compressors do not include dedicated cooling for a specific part of the compressor pivot due to the incompatibility with the pivot pressure in the case of high-speed electric compressors with gas bearings.

[0010] Compressors comprising cooling devices are also known in which a cooling fluid circulation circuit is housed in a casing sealed to the external environment. There is a risk, in the event of a sealing failure, that the engine coolant may mix with the compressed cycle gas, leading to undesirable pollution and costly repairs due to the dismantling of the entire compressor to locate the leaks.

[0011] There is therefore a need to overcome the disadvantages of the prior art mentioned above. Objectives of the invention

[0012] The invention aims to provide a high-speed compressor that avoids the disadvantages of injecting coolant near the pivot and the engine.

[0013] The invention also aims to provide, in at least one embodiment, a high-speed compressor that limits pressure losses at the suction side.

[0014] The invention also aims to provide, in at least one embodiment, a high-speed compressor comprising a cooling system integrated as close as possible to the pivot.

[0015] The invention also aims to provide, in at least one embodiment, a high-speed compressor allowing freedom of pressure adjustment in the pivot.

[0016] The invention also aims to provide, in at least one embodiment, a compartmentalized high-speed compressor enabling optimization of the pivoting cooling.

[0017] The invention also aims to provide, in at least one embodiment, a high-speed compressor comprising a heat transfer system linked to a cooling flow.

[0018] The invention also aims to provide, in at least one embodiment, a high-speed compressor whose structure allows the integrity of a heat-conducting element, such as a heat pipe, to be preserved during maintenance in order to avoid purging and recharging the latter.

[0019] The invention also aims to provide, in at least one embodiment, a high-speed compressor that is easy to maintain, reliable, and easy to disassemble. Description of the invention

[0020] To this end, the invention relates to a high-speed compressor comprising:

[0021] - a casing having a substantially cylindrical body extending along a longitudinal direction, at least one refrigerant circulation channel extending along the longitudinal direction, around the periphery of said cylindrical body, said channel having a refrigerant inlet and outlet;

[0022] - a plurality of pivoting elements arranged coaxially inside the housing;

[0023] said compressor being characterized in that it comprises a plurality of coaxial compartments hermetically connected to each other to form the body of said casing, each compartment comprising respectively:

[0024] - a plurality of longitudinal bores extending around the periphery of said compartment, said bores being configured to form said at least one refrigerant circulation channel by alignment of said plurality of compartments;

[0025] - a pivoting element of said plurality of pivoting elements;

[0026] and in that at least one compartment of said plurality of coaxial compartments, said regulated compartment, further comprises a heat transfer system arranged in the vicinity of a pivoting element of said regulated compartment, said heat transfer system comprising a heat exchanger configured to ensure heat transfer between said pivoting element in the vicinity of which it is arranged and said at least one refrigerant circulation channel.

[0027] Throughout the text, a high-speed compressor is defined as a compressor used to compress gases or fluids at high rotational speeds, in particular compressors capable of reaching a rotational speed of more than 8000 revolutions per minute.

[0028] Throughout the following text, the terms pivoting or pivoting element refer to specific rotating parts of the high-speed compressor. These parts may include, in particular, parts driven in rotation by at least one motor or equivalent means, notably by means of a rotating shaft. These specific rotating parts constitute the pivoting and are preferably selected from rotating elements such as gas bearings and axial gas thrust bearings in the case of a high-speed compressor such as an electric centrifugal compressor, or among the axial or radial bearings used in high-speed screw compressors. The bearings can be ball bearings, tapered roller bearings, or cylindrical roller bearings and can be arranged in the bearing housings and / or thrust bearings of screw compressors.

[0029] Throughout the text, "regulated compartment" means a compartment of the compressor according to the invention comprising an additional heat transfer system, in thermal connection with at least one refrigerant circulation channel.

[0030] For the purposes of this invention, the refrigerant is understood to be a two-phase fluid whose change of state allows for heat transfer. The refrigerant can thus exist in a subcooled state, in which it is entirely liquid; a two-phase state, in which it is partially liquid and partially gaseous; and a superheated state, in which it is entirely gaseous. Preferably, the fluid is a superheated gaseous fluid exhibiting a low pressure at the inlet of the refrigerant circulation channel.

[0031] Throughout this text, the term longitudinal bore means a through bore that can be considered a cavity produced by a machining technique known to those skilled in the art. This bore may be conical, cylindrical, polygonal, or any other shape capable of forming a refrigerant circulation channel by aligning the plurality of coaxial compartments of the compressor.

[0032] Throughout this text, a circulation channel is defined as a fluid flow channel formed by the alignment of said longitudinal bores, said channel being configured to extend around the compressor. Furthermore, the circulation channel may include a heat exchanger and exhibit annular circulation of refrigerant fluid around said compressor, within said heat exchanger, or directly within said circulation channel.

[0033] Thus and according to the invention, the compressor benefits from dedicated and more efficient cooling at the level of the most heat-generating pivoting elements.

[0034] The invention thus proposes a compressor comprising compartments integrating their own heat transport loop, the loops being integrated as close as possible to the pivoting elements to be cooled.

[0035] Advantageously and according to the invention, said plurality of pivoting elements comprises at least one bearing and at least one axial stop.

[0036] Advantageously and according to the invention, said regulated compartment comprises a pivoting element selected from a bearing, an axial stop or bearings.

[0037] Thus, according to the invention, the power of the high-speed compressor is not limited by the cooling capacity of the pivot. Indeed, the rotating parts are critical and limiting elements in the context of compressor operation in the event of excessive heating.

[0038] Advantageously and according to the invention, the compressor comprises a plurality of regulated compartments.

[0039] Thus and according to the invention, the compressor allows targeted cooling of the different pivoting elements, the correct cooling power can be supplied to each pivoting element.

[0040] Advantageously and according to the invention, the heat transfer system further comprises a cooling loop arranged peripherally around the pivoting element of said regulated compartment, said loop being configured to ensure heat transfer by a two-phase or conductive means between said refrigerant circulation channel and said pivoting element.

[0041] Thus and according to the invention, the compressor allows efficient and optimal cooling of the various pivoting elements without requiring a specific regulating device.

[0042] Advantageously and according to the invention, the cooling loop comprises a plurality of heat exchangers, including a first heat exchanger arranged in the vicinity of said refrigerant circulation channel, a second heat exchanger arranged in the vicinity of said bearing and a third heat exchanger arranged at the level of said stop, said first, second and third heat exchangers being configured to carry out heat exchanges by conduction between said cooling loop and said refrigerant circulation channel.

[0043] Thus and according to the invention, the compressor makes it possible to improve the overall cooling performance of the cooling cycle.

[0044] Advantageously and according to the invention, the high-speed compressor is a centrifugal compressor and said plurality of pivoting elements further comprises at least one centrifugal wheel fluidically connected by at least one refrigerant circulation channel.

[0045] Advantageously and according to the invention, the compressor further comprises at least one compartment comprising a centrifugal wheel.

[0046] Thus and according to the invention, the compressor makes it possible to obtain a ventilation flow rate specific to the compartment of said centrifugal wheel.

[0047] Advantageously and according to the invention, the compressor comprises two compartments including a centrifugal wheel, with a first centrifugal wheel, referred to as the low-pressure wheel, and a second centrifugal wheel, referred to as the high-pressure wheel, said first and second centrifugal wheels respectively comprising a refrigerant inlet and outlet, the refrigerant outlet of said low-pressure wheel pressure being fluidly connected to the refrigerant fluid inlet of said high-pressure wheel.

[0048] Thus and according to the invention, the compressor comprises two distinct compression stages while preserving the compactness of said compressor thanks to the compartmentalization.

[0049] Advantageously and according to the invention, the compressor further comprises at least one regulated compartment comprising at least one electric motor, said regulated compartment further comprising a bypass of at least one refrigerant circulation channel arranged in the vicinity of said electric motor.

[0050] Thus and according to the invention, the compressor makes it possible to preserve the performance of the engine during use.

[0051] Advantageously and according to the invention, the heat transfer system of the compartment comprising said electric motor includes a heat exchanger configured to ensure heat exchange by conduction between said motor and said bypass.

[0052] Thus and according to the invention, the compressor allows for efficient cooling of the engine compartment.

[0053] Advantageously and according to the invention, the compressor further comprises a second casing arranged around the first casing.

[0054] Thus and according to the invention, the compressor can benefit from a second casing enveloping all the compartments, which makes it possible to ensure an overall seal that can replace the installation of sealing gaskets between each compartment.

[0055] The invention also relates to a high-speed compressor characterized in whole or in part by the characteristics mentioned above and / or below. List of figures

[0056] Other objects, features and advantages of the invention will become apparent from the following description, given by way of non-limiting example only, and which refers to the single accompanying figure in which: • [Fig.1] schematically represents a longitudinal section of a high-speed compressor, in particular an electric centrifugal compressor according to an embodiment of the invention. • [Fig.2] schematically illustrates examples of longitudinal bores.

[0057] Detailed description of an embodiment of the invention

[0058] In the figures, the scales and proportions are not strictly respected, for the purposes of illustration and clarity.

[0059] In the entire detailed description that follows with reference to the figures, unless otherwise indicated, each element of the centrifugal compressor according to the invention is described as it is arranged during its use.

[0060] Identical, similar or analogous elements are designated by the same references in all figures.

[0061] Figure 1 schematically illustrates a centrifugal compressor 100 according to an embodiment of the invention, particularly in longitudinal section. The centrifugal compressor 100 is an electric compressor comprising a casing 110 having a skin in which a plurality of refrigerant circulation channels 120 are arranged. Each of the refrigerant circulation channels 120 comprises a refrigerant inlet 121 and an outlet 122 at each of the longitudinal ends of the centrifugal compressor 100.

[0062] In the embodiment shown, the centrifugal compressor 100 and the casing 110 have a substantially cylindrical shape and extend along a longitudinal direction. The circulation channels 120 are arranged around the periphery of the longitudinal axis of the compressor, within the casing 110.

[0063] The centrifugal compressor 100 comprises a plurality of pivoting elements arranged coaxially within the housing 110. Furthermore, the centrifugal compressor 100 according to the invention is a compartmentalized compressor formed by a plurality of coaxial compartments. Thus, the compressor 100 can be considered as an assembly of said plurality of compartments, each compartment being hermetically connected to an adjacent compartment by means known to those skilled in the art for maintaining the overall hermeticity of said compressor 100 between each compartment.

[0064] In the described embodiment, the centrifugal compressor comprises six distinct compartments 300, 301, 302, 303, 304, and 305. Each of the compartments 300 to 305 corresponds to a section of the casing 110 and has a general shape of a straight cylinder with a circular base. Furthermore, each of the compartments 300 to 305 comprises a plurality of longitudinal bores 310 passing through the thickness of the casing 110 of each compartment. The compartments 300 to 305 are aligned and arranged in such a way that the through bores 310 of each compartment 300 to 305 can form a continuous channel in the compressor 100. The alignment of the longitudinal bores 310 thus forms the circulation channels 120 of refrigerant fluid extending longitudinally in the skin of the casing 110 of said centrifugal compressor 100.

[0065] The centrifugal compressor 100 comprises a plurality of pivoting elements arranged coaxially within said compressor. In the embodiment As described, the pivoting elements include the bearings and gas thrust bearings of said electric centrifugal compressor.

[0066] The compressor 100 according to the described embodiment comprises an electric motor 202 including a rotor 210 and a stator 211, said rotor 210 being mounted on a rotating shaft extending longitudinally between compartments 300 and 305. The stator 211 extends radially around said rotor 210. The electric motor 202 is configured to drive said rotating shaft.

[0067] The rotor 210 is guided in rotation and held in the housing 110 of the compressor 100 by the gas bearings 201 and 203 respectively located on either side of the motor 202, on the rotating shaft and along its longitudinal direction. The gas bearings 201 and 203 are respectively arranged in compartments 301 and 303 and are configured to support the rotating shaft of the compressor 100.

[0068] The stator 211 of the electric motor 202 is a tooth-wound stator and comprises a plurality of coils having coil heads 212 extending longitudinally outside said stator 211.

[0069] The compressor 100 also includes an axial thrust bearing 204 arranged in compartment 304. The axial thrust bearing 204 comprises a thrust flange 204a extending into compartments 303 and 304 and a thrust body 204b arranged around the rotating shaft. The axial thrust bearing 204 is arranged on the rotating shaft and is configured to limit the longitudinal displacement of said rotating shaft within the housing 110 of the compressor 100.

[0070] The compressor 100 also comprises, according to the described embodiment, two respective compression stages, each having a centrifugal impeller. According to the diagram shown [Fig. 1], the compressor 100 thus comprises a first centrifugal impeller 200, referred to as the low-pressure impeller, and a second centrifugal impeller 205, referred to as the high-pressure impeller. The centrifugal impellers 200 and 205 can be mounted longitudinally opposite each other on a respective end of the rotary shaft of the compressor 100. Each impeller is thus configured to compress all or part of the refrigerant flow from at least one refrigerant circulation channel 120.

[0071] In the described embodiment, each compartment 301, 303 and 304 comprises a respective pivoting element 201, 203 and 204.

[0072] In addition, compartments 301, 303 and 304 are so-called regulated compartments, advantageously each comprising a heat transfer system designed to specifically cool a respective pivoting element of each of the compartments 301, 303 and 304.

[0073] The pivoting element of compartment 301 corresponds to a first gas bearing 201 configured to support the rotating shaft of the motor 202.

[0074] The compartment 302 includes an electric motor 202. This electric motor 202 is configured to rotate the rotary shaft of the compressor 100 and drive at least one centrifugal wheel of the compressor 100.

[0075] The pivoting element of compartment 303 corresponds to a second gas bearing 203.

[0076] The pivoting element of compartment 304 corresponds to an axial stop 204.

[0077] The centrifugal compressor 100 thus makes it possible to obtain optimized cooling around the sensitive elements of the pivoting such as the bearings 201 and 203 as well as the axial thrust bearing 204. A compressor according to the invention advantageously makes it possible to efficiently cool the compressor shaft, where the heat is greatest by thermal bonding of the specific elements of the shaft with a refrigerant fluid channel.

[0078] The regulated compartments 301, 303 and 304 each include a heat transfer system 400 comprising a heat exchanger configured to ensure heat transfer between a respective pivoting element 201, 203 or 204 in the vicinity of which it is arranged and at least one refrigerant circulation channel 120.

[0079] More specifically, the heat transfer system 400 of the controlled compartments 301, 303, and 304 respectively comprises a cooling loop 401, 403, or 404 arranged peripherally around the respective pivoting elements 201, 203, and 204. In the described embodiment, the compartment 302 comprising the electric motor 202 is arranged between the controlled compartments 301 and 303. The heat transfer system 400 of the compartment 302 comprising the electric motor 202 includes a cooling loop 402 comprising a branch 120b of the refrigerant circulation channel 120. The branch 120b is configured to cool the coils 212 and the stator 211 of the motor 202.

[0080] The bypass 120b may be a conduit or any other means known to a person skilled in the art for making a bypass of a refrigerant fluid flow.

[0081] In the described embodiment, the bypass 120b can result from a permeability / restriction play between the compartments 303 and 302 made during assembly and defined by the shape and / or size of the restrictors, in particular for limiting the flow of the compressor 100 while preserving the hermeticity between the two regulated compartments.

[0082] The cooling loops 401, 403 and 404 each comprise a two-phase or conductive means 410 arranged between at least one refrigerant circulation channel 120 and a respective pivoting element 401, 403 or 404 of the compressor 100.

[0083] Each of the cooling loops 401, 403 and 404 also includes at least one heat exchanger 411 configured to provide heat transfer between said pivoting element in the vicinity of which it is arranged and at least one refrigerant circulation channel 120.

[0084] In the described embodiment, the heat transfer system 400 of the regulated compartment 301 includes a cooling loop 401, said loop 401 comprising a two-phase / conductive means 410 and two heat exchangers 411 of the heat pipe type arranged respectively at the pivoting element 201 and the refrigerant circulation channel 120.

[0085] The heat transfer system 400 of compartment 302 includes a cooling loop 402 formed by the branch 120b of the refrigerant circulation channel 120. The loop 402 can be configured to perform heat exchanges between the motor 202 and, more particularly, between the coils 211 and the stator 211 of said motor 202. For this purpose, a heat pipe-type heat exchanger 411 can be arranged at the stator 211 of the electric motor 202.

[0086] The heat transfer system 400 of the regulated compartment 303 includes a cooling loop 403, said loop 403 comprising three heat exchangers 411. Said heat exchangers 411 of said loop 403 are respectively arranged at the level of the refrigerant circulation channel 120 and at the level of the pivoting element 203. Said loop further includes a heat exchanger 411 arranged at the level of the stop flange 204a of the axial stop 204 of the adjacent regulated compartment 304.

[0087] In the described embodiment, the heat transfer system 400 of the regulated compartment 304 includes a cooling loop 404, said loop 404 also including three heat exchangers 411 arranged in the same way as for the cooling loop 403 of the adjacent regulated compartment 303.

[0088] Advantageously, a pivoting element such as the axial stop 204 comprises at least a portion extending into the respective regulated compartments 203 and 204, so the same regulating loop 403 or 404 in the same respective regulated compartment 303 or 304 can be thermally connected with several heat sinks, in particular the pivoting elements 203 and 204.

[0089] Notwithstanding the different cooling loops of the heat transfer systems of the compressor 100, the compartmentalization of said compressor 100 advantageously allows freedom of pressure adjustment at the level of each compartment allowing or not leakage flows and / or a bypass from the refrigerant circulation channel 120.

[0090] During operation of the electric centrifugal compressor 100, a refrigerant in a gaseous state and at a pressure PI is drawn through the bores 310 of each compartment and forms a circulating flow from the inlet 121 to the outlet 122 of each circulation channel 120 formed in the casing skin 110 of the centrifugal compressor 100. The cooling of the different compartments of the electric centrifugal compressor 100 is thus carried out in whole or in part by the heat exchanges between the pivoting elements and the refrigerant circulation channels 120, the refrigerant circulating in said channels 120 having a pressure Pb. The outlet 122 of each refrigerant circulation channel 120 thus feeds a first centrifugal wheel 200, called the low pressure wheel, configured to compress the refrigerant of pressure Pi and provide at the outlet a refrigerant having a pressure P2 greater than Pb. The refrigerant having a pressure P2 is then mostly drawn towards a second centrifugal wheel 205, called the high pressure wheel, configured to compress the refrigerant of pressure P2 and provide at the outlet a refrigerant having a pressure P3 greater than P2.

[0091] Residual leakage rates from the refrigerant at the outlet of each of the wheels 200 and 205 can advantageously enhance the cooling of the pivoting of each of the compartments of the compressor 100.

[0092] More generally, a centrifugal compressor according to the invention can be supplied with a refrigerant at the level of an inlet 121 of a circulation channel 120 at the level of point A. This point A can for example correspond to a fluidic connection with an external cooling system comprising an evaporator configured to supply said compressor 100 with a low pressure refrigerant in the gaseous or two-phase state at the outlet of the evaporator in particular.

[0093] The set of channels 120 thus allows said refrigerant fluid to be drawn in and converge by a centrifugal wheel 200 at point B before arriving at point C corresponding to the second centrifugal wheel 205.

[0094] At the outlet of wheel 205, the refrigerant is then compressed and has a pressure greater than its inlet pressure, thus enabling it to supply an external cooling circuit in fluidic connection with said compressor 100 at point D. This latter fluidic connection being capable of supplying a condenser of the external cooling circuit.

[0095] It should be noted that the arrangement and number of regulated or unregulated compartments, or the number of pivoting elements of the centrifugal compressor, may vary according to requirements.

[0096] The invention cannot therefore be limited to the single embodiment described above.

[0097] [Fig.2] schematically illustrates several embodiments of the bores longitudinal formed on the coaxial compartments and capable of being used to form the refrigerant circulation channels 120.

[0098] In one embodiment, the 310A bores formed in a compartment have a hexagonal shape.

[0099] In another embodiment, the compartments of the high-speed compressor have annular-shaped bores 310B.

[0100] In another embodiment, the compartments of the high-speed compressor have a combination of bores 310C and 310D.

[0101] In addition, each of the coaxial compartments forming the high-speed compressor according to the invention has an identical through bore shape 310, 310A, 310B, 310C, 310B so as to form a refrigerant circulation channel extending longitudinally around the periphery of the compartments of said compressor.

[0102] It is understood that the invention cannot be limited to these embodiments.

Claims

Demands

1. High-speed compressor (100) comprising: • a casing (110) having a substantially cylindrical body extending in a longitudinal direction, at least one circulation channel (120) of a refrigerant fluid extending along the longitudinal direction, around the periphery of said cylindrical body, said channel (120) having an inlet (121) and an outlet (122) of refrigerant fluid; • a plurality of pivoting elements (201, 203, 204) arranged coaxially inside the casing (110);said compressor (100) being characterized in that it comprises a plurality of coaxial compartments (300, 301, 302, 303, 304, 305) hermetically connected to each other to form the body of said casing (110), each compartment comprising respectively: • a plurality of longitudinal bores (310) extending around the periphery of said compartment, said bores (310) being configured to form said at least one refrigerant circulation channel (120) by alignment of said plurality of compartments; • a pivoting element of said plurality of pivoting elements;and in that at least one compartment of said plurality of coaxial compartments, said regulated compartment, further comprises a heat transfer system (400) arranged in the vicinity of a pivoting element of said regulated compartment, said heat transfer system (400) comprising a heat exchanger configured to ensure heat transfer between said pivoting element in the vicinity of which it is arranged and said at least one refrigerant circulation channel (120).

2. High-speed compressor according to claim 1 characterized in that said plurality of pivoting elements comprises at least one bearing (201, 203) and at least one axial stop (204).

3. Compressor according to claim 1 or 2, characterized in that said regulated compartment comprises a pivoting element chosen from a bearing (201, 203), an axial thrust bearing (204) or bearings.

4. Compressor according to any one of the preceding claims, characterized in that it comprises a plurality of regulated compartments.

5. Compressor according to any one of the preceding claims, characterized in that the heat transfer system (400) further comprises a cooling loop (401, 403, 404) arranged peripherally around the pivoting element of said regulated compartment, said loop being configured to ensure heat transfer by a two-phase or conductive means between said refrigerant circulation channel (120) and said pivoting element.

6. Compressor according to claim 5, characterized in that the cooling loop comprises a plurality of heat exchangers (411) of which a first heat exchanger is arranged in the vicinity of said refrigerant circulation channel (120), a second heat exchanger is arranged in the vicinity of said bearing and a third heat exchanger is arranged at said stop, said first, second and third heat exchangers being configured to carry out heat exchanges by conduction between said cooling loop and said refrigerant circulation channel.

7. Compressor according to any one of the preceding claims, characterized in that said compressor is a centrifugal compressor further comprising at least one centrifugal wheel fluidically connected by at least one refrigerant circulation channel (120).

8. Compressor according to claim 7, characterized in that it further comprises at least one compartment comprising a centrifugal wheel.

9. Compressor according to claim 8, characterized in that it comprises two compartments (300, 305) comprising a centrifugal wheel, with a first centrifugal wheel (200), referred to as the low pressure wheel, and a second centrifugal wheel (205), referred to as the high pressure wheel, said first and second centrifugal wheels (200, 205) comprising respectively an inlet and an outlet of refrigerant fluid, the outlet of refrigerant fluid of said low pressure wheel being fluidly connected to the inlet of refrigerant fluid of said high pressure wheel.

10. Compressor according to any one of the preceding claims, characterized in that it further comprises at least one compartment (302) comprising at least one electric motor (202), said compartment (302) further comprising a bypass (120b) of at least one refrigerant circulation channel (120) arranged in the vicinity of said electric motor (202).

11. Compressor according to claim 10, characterized in that the heat transfer system of the compartment (302) comprising said electric motor (202) includes a heat exchanger configured to ensure heat exchange by conduction between said electric motor (202) and said bypass (120b).

12. Compressor according to any one of the preceding claims, characterized in that it further comprises a second casing arranged around the first casing (110).

Images