Compressor and refrigeration system

Abstract

The present invention relates to compressors and refrigeration systems. The compressor includes a motor including a rotor and a stator having a plurality of stator teeth. Each stator tooth includes a winding tooth portion extending along and defining at least one of the winding slots, and a cooling fin portion extending radially inward from the winding tooth portion. The cooling fin portion of each stator tooth is circumferentially spaced from the other cooling fin portions to define a plurality of cooling channels between the cooling fin portions.

Description

Technical Field

[0001] The field of this disclosure generally relates to compressors used in refrigeration systems, and more specifically to motors including stator cooling fins for such compressors. Background Technology

[0002] The compressor includes a cooling system for supplying coolant to the motor and bearings associated with the compressor drive shaft to maintain them within a suitable operating temperature range. For example, the stator can be cooled by coolant flowing axially along cooling ducts or tubes that extend through winding slots formed between adjacent stator teeth to deliver coolant fluid for removing heat from the stator and / or rotor. The shape and configuration of such coolant ducts to facilitate coolant flow through the motor may have limitations.

[0003] This section is intended to introduce the reader to various aspects of the prior art that may be related to the aspects of this disclosure described below and / or claimed. This discussion is intended to help provide the reader with background information to facilitate a better understanding of the various aspects of this disclosure. Therefore, it should be understood that these statements should be read in this light, rather than as an admission of prior art. Summary of the Invention

[0004] In one aspect, the compressor includes a compressor housing, a shaft rotatably supported within the compressor housing by at least one bearing, at least one impeller operably connected to the shaft, and a motor operably connected to the shaft. The motor includes a rotor connected to the shaft and a stator, the stator including an annular hub and a plurality of stator teeth extending radially inward from the hub. The stator teeth are circumferentially spaced apart to define a plurality of winding slots therebetween. The motor includes stator windings positioned in each of the winding slots and wound around at least one of the stator teeth. Each stator tooth includes a winding tooth portion extending along and defining at least one winding slot, and a cooling fin portion extending radially inward from the winding tooth portion. The cooling fin portion of each stator tooth is circumferentially spaced apart from other cooling fin portions to define a plurality of cooling channels therebetween. Each cooling channel extends a certain circumferential width between adjacent cooling fin portions and a certain radial length from the winding tooth portion toward the distal end of the cooling fin portion. The radial length is greater than the circumferential width, and each cooling channel has no stator winding.

[0005] On the other hand, the compressor includes a compressor housing, a shaft rotatably supported within the compressor housing by a first bearing and a second bearing, a first impeller operably connected to the shaft at a first end, a second impeller operably connected to the shaft at a second end, and a cooling passage defined by the compressor housing and fluidly connected to a coolant inlet passage. The cooling passage includes a first portion and a second portion, such that an inlet coolant flow is divided into a first coolant flow along the first portion and a second coolant flow along the second portion. The first coolant flow is delivered to the first bearing, and the second coolant flow is delivered to the second bearing. The compressor includes a motor operably connected to the shaft. The motor includes a rotor connected to the shaft and a stator including an annular hub and a plurality of stator teeth extending radially inward from the hub. The stator teeth are circumferentially spaced apart to define a plurality of winding slots therebetween. The motor includes stator windings positioned in each winding slot and wound around at least one of the stator teeth. Each stator tooth includes a winding tooth portion extending along and defining at least one winding slot in the winding slot, and a cooling fin portion extending radially inward from the winding tooth portion. The cooling fin portion of each stator tooth is circumferentially spaced from the other cooling fin portions to define a plurality of stator cooling channels therebetween. Each stator cooling channel has no stator winding to receive a portion of the second coolant flow after the second coolant flow is delivered to the second bearing.

[0006] In another aspect, the refrigeration system includes an evaporator, a condenser, an expansion device, a coolant supply line fluidly connected to the condenser to receive coolant from the condenser, and a compressor. The compressor includes a compressor housing and a motor, the compressor housing defining a coolant inlet connected to the coolant supply line. The motor includes: a stator comprising an annular hub and a plurality of stator teeth extending radially inward from the hub, wherein the stator teeth are circumferentially spaced apart to define a plurality of winding slots therebetween; and a stator winding positioned within each winding slot and wound around at least one of the stator teeth. Each stator tooth includes a winding tooth portion extending along and defining at least one winding slot, and a cooling fin portion extending radially inward from the winding tooth portion. The cooling fin portion of each stator tooth is circumferentially spaced apart from other cooling fin portions to define a plurality of cooling channels therebetween for guiding coolant through the motor. Each cooling channel extends a certain radial length from the winding tooth portion toward the distal end of the cooling fin portion. Each cooling channel has no stator winding to receive coolant from the coolant supply line.

[0007] Various modifications exist to the features indicated in relation to the aspects mentioned above in this disclosure. Other features may also be included in the aspects mentioned above in this disclosure. These modifications and additional features may exist individually or in any combination. For example, various features discussed below with respect to any embodiment of the illustrated embodiments of this disclosure may be incorporated individually or in any combination into any of the foregoing aspects of this disclosure. Attached Figure Description

[0008] Figure 1 This is a 3D view of an example compressor.

[0009] Figure 2 yes Figure 1 The compressor shown is a side view.

[0010] Figure 3 It is along Figure 1 The line 3-3 shown is the cut Figure 1 A cross-sectional view of the compressor.

[0011] Figure 4 It can be implemented within it. Figure 1 A schematic diagram of an example refrigeration system with a compressor.

[0012] Figure 5 It is along Figure 1 The line shown is cut from line 5-5. Figure 1 Another cross-sectional view of the compressor.

[0013] Figure 6 yes Figure 5 The image shows a perspective view of the compressor stator.

[0014] Figure 7 It is along Figure 6 The cross-sectional view of the stator is shown by line 7-7.

[0015] Figure 8 It is suitable for and Figure 1 A perspective view of another embodiment of the stator used in conjunction with a compressor.

[0016] In all the accompanying drawings, the corresponding reference numerals indicate the corresponding parts. Detailed Implementation

[0017] The compressor motor embodiments described herein include multiple cooling fins that define axially extending cooling channels without stator windings, thereby achieving improved flow dynamics of coolant flow through the motor and stator, such as reduced turbulence and / or increased flow rate and / or flow volume. In the embodiments described herein, the motor includes a rotor, a stator, and stator windings. The stator includes an annular hub and multiple stator teeth extending radially inward from the hub. The stator teeth are circumferentially spaced apart from each other to define multiple winding slots between the stator teeth. Each stator tooth includes a winding tooth portion and a cooling fin portion. The winding tooth portion extends along at least one winding slot and defines at least one winding slot. In the embodiments described herein, the cooling fin portions extend radially inward from the winding tooth portions. The cooling fin portions of each stator tooth are circumferentially spaced apart from other cooling fin portions to define multiple cooling channels therebetween. Each cooling channel extends a circumferential width between adjacent cooling fin portions and a radial length from the winding tooth portion toward the distal end of the cooling fin portion. In some embodiments described herein, the radial length of the cooling channel is greater than the circumferential width, and each cooling channel lacks stator windings and / or other structures such as insulators or coolant pipes, such that multiple axially extending cooling channels provide a radially elongated path for supplying coolant flow through the motor to cool the various components of the motor. Therefore, the motor and stator embodiments described herein provide improved cooling, for example, by allowing unobstructed flow of coolant along axially extending radially elongated cooling channels located radially adjacent to the compressor shaft or rotor.

[0018] In the embodiments described herein, the cooling fin portion and the winding portion are integrally formed together, for example, during a stamping process. In alternative embodiments, the cooling fin portion and the winding portion are integrally formed together during a molding process, allowing the stator teeth to be formed without significant manufacturing costs or additional assembly time. In alternative embodiments, the cooling fin portion and the winding tooth portion can be formed separately and joined together using any suitable fastener or connection method, such as welding, allowing the cooling fin portion to be retrofitted to existing motor assemblies.

[0019] This document describes in detail exemplary embodiments of the compressor motor and stator. The aspects of the compressor motor and stator are not limited to the specific embodiments described herein, but rather, components of the compressor motor and stator can be used independently and separately from other components described herein. For example, in some embodiments, the cooling fin portion includes a boot-shaped portion, and in other embodiments, the boot-shaped portion may be omitted.

[0020] As used herein, the terms “about,” “approximately,” “basically,” and “about” when used in conjunction with a range of size, concentration, temperature, or other physical or chemical properties or characteristics mean to cover variations that may exist in the upper and / or lower limits of the range of the property or characteristic, including variations caused, for example, by rounding, measurement methods, or other statistical variations.

[0021] For the sake of brevity, an example of a two-stage centrifugal compressor will be described. However, the methods and systems described herein can be applied to other suitable compressors. The compressor's bearings, motor, and other components can be cooled using steam injected into the coolant path inlet by diverting portions of the main flow of the refrigeration system to the coolant circuit to selectively provide coolant flow paths for cooling these components based on measured and desired temperatures of the bearings, motor, or other driven components. In other embodiments, the coolant flow can be introduced into the motor from any suitable source.

[0022] Figure 1 This is a perspective view of an example two-stage refrigeration compressor 100. The compressor 100 is operable to compress a working fluid (e.g., refrigerant), and includes a compressor housing 102 forming at least one sealed cavity within which each stage of refrigerant compression is performed. The compressor 100 includes: a first refrigerant inlet 110 for introducing refrigerant vapor into a first compression stage 124; a first refrigerant outlet 114; a refrigerant transfer conduit 112 for transferring compressed refrigerant from the first compression stage 124 to a second compression stage 126; a second refrigerant inlet 118 for introducing refrigerant vapor into the second compression stage 126; and a second refrigerant outlet 120. The refrigerant transfer conduit 112 is operatively connected at opposite ends to the first refrigerant outlet 114 and the second refrigerant inlet 118. The refrigerant transfer conduit 112 also includes a port 122 for adding or removing flow between the first compression stage 124 and the second compression stage 126. The second refrigerant outlet 120 delivers compressed refrigerant from the second compression stage 126 to... Figure 4 The cooling system 200 shown incorporates a compressor 100.

[0023] See also Figure 3The compressor housing 102 encloses a first compression stage 124 and a second compression stage 126 located at opposite ends of the compressor 100. The first compression stage 124 includes a first impeller 106 configured to increase kinetic energy into the refrigerant entering via the first refrigerant inlet 110. The kinetic energy imparted to the refrigerant by the first impeller 106 is converted into increased refrigerant pressure as the refrigerant velocity decreases during its transfer to a sealed cavity (e.g., a diffuser) formed within the volute 132. The first compression stage 124 also includes a first variable inlet guide vane (VIGV) 134 disposed upstream of the first impeller 106 in the first refrigerant inlet 110. The first variable inlet guide vane 134 includes a plurality of blades whose positions can be controlled to introduce a pre-vortex into the gaseous refrigerant entering the first refrigerant inlet 110.

[0024] Similarly, the second compression stage 126 includes a second impeller 116 configured to increase the kinetic energy of the refrigerant entering from the first compression stage 124 via the second refrigerant inlet 118. The kinetic energy imparted to the refrigerant by the second impeller 116 is converted into increased refrigerant pressure as the refrigerant velocity decreases during its transfer to a sealed cavity (e.g., a diffuser) formed within the volute 138. The compressed refrigerant exits the second compression stage 126 via the second refrigerant outlet 120.

[0025] The second compression stage 126 also includes a second variable inlet guide vane (VIGV) 136 disposed upstream of the second impeller 116 in the second refrigerant inlet 118. The second variable inlet guide vane 136 includes a plurality of blades whose positions can be controlled to introduce a pre-vortex into the gaseous refrigerant entering the second refrigerant inlet 118.

[0026] The first impeller 106 and the second impeller 116 are connected at opposite ends of the shaft 104, which includes a longitudinal axis A extending between the first shaft end 140 and the second shaft end 142. 104Shaft 104 is operably connected to motor 300 (e.g., operably connected to motor 300 via magnetic interaction between rotor and stator 394). Motor 300 is positioned between first impeller 106 and second impeller 116, for example, approximately midway between the first impeller 106 and second impeller 116, such that the first impeller 106 and second impeller 116 rotate at a selected rotational speed to compress refrigerant to a pre-selected pressure exiting second refrigerant outlet 120. Typically, motor 300 includes one or more components associated with an electric motor (e.g., a three-phase induction motor), as further described herein. In some embodiments, compressor 100 may include a motor temperature sensor (not shown) operable to determine the temperature of motor 300. The motor temperature sensor may be a thermocouple, thermistor, resistance temperature detector (RTD), or any other suitable sensor.

[0027] Shaft 104 is rotatably supported by a first bearing assembly 160 associated with a first compression stage 124 and positioned within a first bearing housing 162, and a second bearing assembly 164 associated with a second compression stage 126 and positioned within a second bearing housing 166. Each of the first bearing housing 162 and the second bearing housing 166 includes a mounting structure for connecting the respective bearing housing to the compressor housing 102. The first bearing assembly 160 and the second bearing assembly 164 rotatably support shaft 104 at opposite ends, wherein a motor 108 is disposed between the first bearing assembly 160 and the second bearing assembly 164. In some embodiments, the first bearing assembly 160 and the second bearing assembly 164 may each include a radial bearing and / or a thrust bearing. In some embodiments, the first bearing assembly 160 and the second bearing assembly 164 may include a gas foil bearing.

[0028] Figure 4 It can be implemented within it. Figure 1 A schematic diagram of an example refrigeration system 200 with compressor 100. Refrigeration system 200 includes compressor 202 (e.g., compressor 100), condenser 204, expansion device 206 (e.g., expansion valve, orifice, capillary tube), and evaporator 208. Without departing from the scope of this disclosure, refrigeration system 200 may include, in addition to those shown in the reference diagram, other components. Figure 4 Additional or other components in addition to those shown and described.

[0029] In operation, compressor 202 receives a working fluid, such as refrigerant, as a low-pressure gas through suction line 210. Compressor 202 compresses the low-pressure refrigerant gas, thereby increasing the temperature and pressure of the refrigerant. The compressed, high-temperature refrigerant leaving compressor 202 is directed toward and through condenser 204, where it is condensed into a high-pressure liquid or a high-pressure liquid-gas mixture. The compressed, condensed refrigerant leaving condenser 204 is directed toward and through expansion device 206, which expands the refrigerant, thereby reducing its pressure. The expanded (or "uncompressed") refrigerant leaving expansion device 206 may be a gas or a mixture of gas and liquid after passing through expansion device 206. The uncompressed refrigerant leaving expansion device 206 is directed toward and through evaporator 208. Evaporator 208 may include a heat exchanger through which a relatively hot fluid circulates and is cooled by an uncompressed refrigerant fluid. The uncompressed refrigerant fluid evaporates into a gas in evaporator 208. The uncompressed refrigerant gas leaving evaporator 208 is guided back to compressor 202 via suction line 210, where the working fluid is compressed again, and the process is repeated.

[0030] Example refrigeration system 200 includes a compressor cooling system 212 that draws working fluid (e.g., refrigerant) from a portion of the main refrigeration circuit (i.e., a refrigeration circuit in which working fluid is compressed using compressor 202, condensed using condenser 204, expanded using expansion device 206, and evaporated using evaporator 208). The working fluid used in compressor cooling system 212 is transferred from the main refrigeration circuit and directed toward compressor 202 via coolant supply line 220 to cool components of compressor 202, such as the motor and bearings of compressor 202. The working fluid used in compressor cooling system 212 may also be referred to herein as “coolant” or coolant 222. The coolant is returned to the refrigeration circuit via coolant return line 214, directed toward compressor 202 or a low-pressure line (e.g., suction line 210) of the refrigerant circuit. As used herein, a “low-pressure line” of a compressor (e.g., compressor 202) refers to a refrigerant flow passage within the main refrigeration circuit of the compressor or compressor 202 as part thereof, which is in front of one or more impellers in the compressor stages (e.g., the first-stage impeller of the compressor) and directs refrigerant toward one or more impellers in the compressor stages. The low-pressure line of compressor 202 may include, for example, but not limited to, a passage extending between the inlet of the first stage of compressor 202 and the first-stage impeller, the first-stage inlet of compressor 202, and a suction line 210 connected to the first-stage inlet of compressor 202.

[0031] The coolant used in the cooling system 212 is appropriately drawn from the low-temperature, high-pressure side of the main refrigeration circuit, downstream of the condenser 204 and upstream of the expansion device 206 (i.e., from the refrigerant line connecting the condenser 204 and the expansion device 206), or alternatively, drawn from the condenser 204.

[0032] Drawing refrigerant from the main refrigeration circuit at this stage offers several advantages. The pressure difference in the cooling circuit of cooling system 212—that is, the pressure difference between the high-pressure refrigerant leaving condenser 204 and the low-pressure refrigerant entering compressor 202 via suction line 210—facilitates the driving of refrigerant through compressor 202 and back into the refrigeration circuit. The relatively low temperature of the refrigerant leaving condenser 204 compared to the refrigerant temperature at downstream stages of the main refrigeration circuit (e.g., leaving evaporator 208 and / or expansion device 206) contributes to increased cooling capacity of cooling system 212.

[0033] Reference Figure 3 as well as Figures 5 to 8 The motor 300 includes a stator 302, a rotor 304 connected to a shaft 104, and a stator winding 332 (e.g., Figure 6 and Figure 7(As shown). The stator 302 includes an annular hub 330 and a plurality of stator teeth 310 extending radially inward from the hub 330. The stator teeth 310 are circumferentially spaced apart to define a plurality of winding slots 322 therebetween. Each stator tooth 310 extends in a radial direction perpendicular to the axial direction A, which is parallel to the longitudinal axis A. 104 Each stator tooth 310 extends radially between a first radial end 312 and a second radial end 314, the second radial end 314 being positioned radially inward from the first radial end 312 by a radial length L. 310R (like Figure 7 (As shown). Each stator tooth 310 also extends along, for example, the longitudinal axis A of shaft 104. 104 The axial length L extends in the parallel axial direction A. 310A .exist Figure 6 As shown in the image.

[0034] Each of the plurality of stator teeth 310 includes a winding tooth portion 320 extending along and defining at least one winding slot in the winding slot 322, and a cooling fin portion 324 extending radially inward from the winding tooth portion 320. The cooling fin portion 324 of each stator tooth 310 is circumferentially spaced from the cooling fin portions 324 of the other stator teeth 310 to define a plurality of cooling channels 326 therebetween. The cooling channels 326 defined by the plurality of cooling fin portions 324 provide for the flow of coolant F 300 Along the axial direction A, for example, the longitudinal axis A parallel to shaft 104. 104 The path travels for cooling components of the motor 300 and / or the compressor 100. In the illustrated embodiment, the cooling channel 326 may be positioned radially adjacent to the rotor 304 or the shaft 104.

[0035] In the embodiments described herein, the cooling fin portion 324 and the winding tooth portion 320 are integrally formed together, for example, during a stamping process. In other embodiments, the cooling fin portion 324 and the winding tooth portion 320 may be formed separately and joined together using any suitable fastener or connection method, such as welding.

[0036] Stator windings 332 are disposed within winding slots 322. For example, stator windings 332 are wound around winding tooth portions 320 along an axial direction A. In some embodiments, motor 300 is a three-phase induction motor having three sets of stator windings 332. Typically, winding 332 refers to a single winding 332, which is composed of a number of turns of conductive wire (e.g., copper wire) wound around winding teeth 320. In some embodiments, multiple stator windings 332 are disposed within a single winding slot in winding slot 322. In some embodiments, motor 300 further includes an insulator 338 surrounding the stator windings 332 (in... Figure 8 (As shown in the image).

[0037] Each winding tooth portion 320 includes a first radial end portion 340 and a second radial end portion 342 disposed radially inside the first radial end portion 340. Each winding tooth portion 320 extends axially between the first axial end portion 346 and the second axial end portion 344 by an axial length L. 320A The winding tooth portions 320 are radially equidistant from each other, such that the winding slots 322 defined between adjacent winding tooth portions 320 are sized and shaped to receive the stator windings 332 therein.

[0038] Further reference Figure 4 and Figure 6 The cooling fin portion 324 extends along the axial direction A between the first axial end 352 and the second axial end 350 for an axial length L. 324A To limit the axial length L of the cooling channel 326 326A The cooling fin portion 324 and winding tooth portion 320 of each stator tooth portion 310 have a common axial length. For example, the axial length L 324A and L 326A With axial length L 320A They are substantially the same, such that the axial inlet 356 and axial outlet 354 of the cooling channel 326 share a common terminal with the first axial end 346 and the second axial end 344 of the winding tooth portion 320. The cooling fin portion 324 and the cooling channel 326 extend the entire axial length of the stator 302.

[0039] Reference Figure 6 and Figure 7 The cooling fin portion 324 extends radially by a length L between the first radial end 360 and the second distal radial end or the second free radial end 362. 324R The first radial end portion 360 is connected to or integrally formed with the second radial end portion 342 of the winding tooth portion 320. The radial length L of the cooling fin portion 324 is... 324RThe diameter can be between 5 mm and 12 mm, between 4 mm and 15 mm, or between 10 mm and 20 mm. In some embodiments, the radial length L of the cooling fin portion 324 is... 324R The radial length L is greater than the 320mm of the winding tooth portion. 320R .

[0040] The cooling fin portion 324 is elongated in the radial direction, wherein the radial length L 324R Greater than thickness t 324 In some embodiments, the cooling fin portion 324 can be relatively thin. For example, a thickness t 324 It can be between 3 mm and 5 mm, between 1 mm and 8 mm, or between 2 mm and 6 mm. In some embodiments, the thickness t 324 and length L 324R It can be scaled based on the compressor's capacity ratio, for example, in tons. In some embodiments, the cooling fin portion 324 can be scaled along the entire radial length L of the cooling fin portion 324. 324R With a substantially constant thickness t 324 In some other embodiments, the thickness t of the cooling fin portion 324 is... 324 The cooling fin portion 324 can taper from the first radial end 360 to the second radial end 362. In some embodiments, the thickness t of the cooling fin portion 324 is... 324 The thickness t is less than 320 of the winding tooth portion. 320 In some embodiments, the thickness t of the winding tooth portion 320 is... 320 The thickness t gradually decreases and transitions to the cooling fin section 324. 324 For example, the thickness t of the second radial end 342 of the winding tooth portion 320 320 The thickness t of the cooling fin portion 324 can be used. 324 The same. In some embodiments, the thickness t of the cooling fin portion 324 is... 324 The thickness t is not greater than 320 mm in the winding tooth portion. 320 .

[0041] Cooling channel 326 extends circumferentially by a width W between adjacent cooling fin portions 324. 326 And extending radially by a length L from the second distal radial end 362 of the winding tooth portion 320 to the cooling fin portion 324. 326R In the embodiments described herein, the radial length L 326R Greater than the circumferential width W 326 The elongated cooling channel 326 can be approximately trapezoidal in shape, having a base circumferential width W. 326a The circumferential width of the base W326a Greater than the end circumferential width W 326b .

[0042] As described above, the cooling channel 326 has no stator winding 332 at all. In the illustrated embodiment, the stator winding 332, positioned within the winding slot 322, is spaced radially from the rotor 304 and / or shaft 104 by a certain distance, for example, by the radial length L of the cooling fin portion 324. 324R and / or the radial length L of the cooling channel 326 326R In some other embodiments, the radial distance between the rotor 304 or shaft 104 and the stator winding 332 is greater than the radial length L of the cooling fin portion 324. 324R and / or the radial length L of the cooling channel 326 326R .

[0043] In some embodiments, the second radial end portion 362 of the cooling fin portion 324 includes a boot-shaped portion 370 having a circumferential width greater than the thickness t of the cooling fin portion 324. 324 The boot-shaped portion 370 of the cooling fin portion 324, positioned near the rotor 304 and / or shaft 104, distributes the magnetic field over an increased area. In some embodiments, the winding tooth portion 320 may also have a boot-shaped portion (not shown) for retaining the stator winding 332 within the winding slot 322. In some embodiments, both the winding tooth portion 320 and the cooling fin portion 324 have boot-shaped portions.

[0044] In some embodiments, the stator teeth 310, including the winding tooth portion 320 and the cooling fin portion 324, are made of stainless steel, silicon steel, or any other suitable material. In some embodiments, the cooling fin portion 324 is made of the same material as the winding tooth portion 320 and / or may be integrally formed with the winding tooth portion 320. In some alternative embodiments, the cooling fin portion 324 is made of a different material than the winding tooth portion 320.

[0045] Reference Figure 8 The winding tooth portion 320 and the stator winding 332 can be encased in an insulator 338. In the embodiment described herein, the cooling channel 326 also lacks an insulator 338. Instead, the stator winding 332, encased in the insulator 338, is radially spaced from the rotor 304 or shaft 104 by an elongated cooling channel 326. The insulator 338 can be any type of insulator, such as insulating cloth, and / or the insulator 338 can contain insulating resin or other suitable insulating materials such as polyetheretherketone (PEEK).

[0046] Motor 300 may be a component of cooling system 400, which includes components for directing coolant flow F 入口 A coolant supply line 402 is introduced from a coolant source into the compressor 100 through a coolant inlet passage 404. In the illustrated embodiment, the coolant source is a working fluid, such as coolant 222, drawn from the refrigeration system 200 via supply line 220. Figure 4 As shown in the illustration, in the embodiment depicted, the working fluid is drawn from the refrigerant circuit downstream of the condenser 204. However, the working fluid may be drawn from any suitable portion of the refrigerant circuit that enables the compressor cooling system 212 to function as described herein, such as downstream of the expansion device 206 or from the evaporator 208. In an alternative embodiment, the coolant source may be any suitable coolant source for supplying any suitable coolant, such as a coolant separate from the working fluid.

[0047] Refer again Figure 3 In some embodiments, the compressor 100 includes a cooling passage 406 defined by a compressor housing 102, the cooling passage 406 receiving a flow of coolant F supplied to the compressor 100. 入口 The coolant inlet channel 404 is in fluid communication. The cooling channel 406 includes a first portion 408 and a second portion 409, allowing the coolant to flow F... 入口 It was divided into the first coolant stream F A Second coolant flow F B First coolant flow F A A first amount of coolant is delivered to the first bearing assembly 160 to cool the first bearing assembly 160, and a second coolant flow F B A second amount of coolant is delivered to the second bearing assembly 164 to cool it. The cooling channel 406, including the first portion 408 and the second portion 409, may extend at least partially around the motor 300, either wound or spirally. When installed in the compressor housing 102, the cooling channel 406 opens to and communicates with the interior of the compressor housing 102 and the motor 300. Furthermore, when the compressor 100 is assembled, the motor 300 forms the inner boundary 420 of the cooling channel 406. For example, the outer surface 422 of the motor 300 forms the inner boundary 420 of the cooling channel 406. The cooling channel 406 runs along the longitudinal axis A of the shaft 104. 104 The direction extends spirally along the entire axial length or total axial length, which may be approximately the same as the axial length of the motor 300.

[0048] In some embodiments, the first portion 408 and the second portion 409 have the same number of turning portions per unit axial length, such that the cooling channel 402 has a uniform helical winding portion along its entire axial length. In some alternative embodiments, the first portion 408 and the second portion 409 have different numbers of turning portions per unit axial length. For example, the first portion 408 may have more turning portions per unit axial length than the second portion 409. Alternatively, the second portion 409 may have more turning portions per unit axial length than the first portion 408.

[0049] In the embodiments described herein, the coolant flow F 300 It is in the second coolant flow F B The second coolant flow F, which has already cooled the second bearing assembly 164, is introduced into the axial inlet 356 of the cooling channel 326. B Coolant flow F 300 The coolant flows axially through multiple cooling channels 326 to cool the components of the motor 300. Then, in the first coolant flow F... A After the first bearing assembly 160 has been cooled, the coolant flow F 300 At axial outlet 354, the coolant exits the cooling channel 326, and at axial outlet 354, the coolant flow F... 300 With the first coolant flow F A Combined to form a combined flow F C Then the combined flow F C Discharge is made through outlet line 410, which includes outlet 412 located at the first compression stage 124, so that the combined flow is introduced into the first refrigerant inlet 110.

[0050] In the embodiments described herein, the cooling fin portions defining multiple axially extending cooling channels have no stator windings or any other structural elements, such as insulating material or restrictive structures like tubes or conduits, allowing the coolant flow F 300 The cooling fins travel unimpeded along their axial length. The cooling fin portions are elongated in the radial direction, thus having a radial length greater than their thickness, and the cooling fin portions define axially extending trapezoidal cooling channels with a radial length longer than their circumferential width, such that the coolant flows axially not only near the shaft, but also near the winding tooth portions and near the stator windings disposed in the winding tooth portions.

[0051] When elements or embodiments of this disclosure are introduced, the terms “a,” “an,” “the,” and “the” are intended to indicate the presence of one or more elements. The terms “comprising,” “including,” “containing,” and “having” are intended to be inclusive and mean that additional elements may be present in addition to the listed elements. The use of terms indicating a particular orientation (e.g., “top,” “bottom,” “side,” etc.) is for ease of description and does not require any particular orientation of the object being described.

[0052] Since various changes can be made to the above-described constructions and methods without departing from the scope of this disclosure, all content contained in the above description and shown in the accompanying drawings should be interpreted as illustrative and not restrictive.

Claims

1. A compressor, comprising: Compressor housing; A shaft, which is rotatably supported within the compressor housing by at least one bearing; At least one impeller, the impeller being operably connected to the shaft; as well as A motor operably connected to the shaft, wherein the motor includes: Rotor, the rotor being connected to the shaft; A stator, the stator comprising an annular hub and a plurality of stator teeth extending radially inward from the hub, wherein the stator teeth are circumferentially spaced apart to define a plurality of winding slots between the stator teeth; and A stator winding, wherein the stator winding is positioned in each of the winding slots and wound around at least one of the stator teeth; Each stator tooth includes: A winding tooth portion, the winding tooth portion extending along at least one winding slot in the winding slots and defining at least one winding slot in the winding slots; and The cooling fin portion extends radially inward from the winding tooth portion, wherein the cooling fin portion of each stator tooth is circumferentially spaced from the other cooling fin portions to define a plurality of cooling channels between the cooling fin portions, wherein each cooling channel extends a certain circumferential width between adjacent cooling fin portions and extends a certain radial length from the winding tooth portion toward the distal end of the cooling fin portion, wherein the radial length is greater than the circumferential width, and wherein each cooling channel has no stator winding.

2. The compressor according to claim 1, wherein, Each cooling fin section is elongated in the radial direction and has a radial length greater than its radial thickness.

3. The compressor according to claim 1, wherein, Each cooling fin portion has a thickness no greater than the thickness of each winding tooth portion in the winding tooth portion.

4. The compressor according to claim 1, wherein, The cooling fin portion and the cooling channel extend the entire axial length of the stator.

5. The compressor according to claim 1, wherein, Each cooling fin section has a thickness between 3 mm and 5 mm.

6. The compressor according to claim 1, wherein, The cooling fin portion and the winding tooth portion of each stator tooth have a common axial length, such that the axial inlet of each cooling channel shares a common end with the first axial end of each winding tooth portion, and the axial outlet of each cooling channel shares a common end with the second axial end of each winding tooth portion.

7. The compressor according to claim 1, wherein, Each cooling fin portion has a radial thickness that is approximately constant along the radial length of the cooling fin portion.

8. The compressor according to claim 1, wherein, Each cooling fin portion is integrally formed with the winding tooth portion.

9. The compressor according to claim 1, wherein, Each cooling fin portion includes a boot-shaped portion located at the distal end of the cooling fin portion, wherein the boot-shaped portion has a width greater than the thickness of the cooling fin portion.

10. The compressor according to claim 1, wherein, The at least one bearing includes a first bearing and a second bearing, wherein the compressor further includes a coolant flow path that delivers a first amount of coolant to the first bearing assembly and a second amount of coolant to the second bearing assembly, and wherein, after the first amount of coolant cools the first bearing assembly, the first amount of coolant flows axially through the plurality of cooling channels.

11. A compressor, comprising: Compressor housing; A shaft, which is rotatably supported within the compressor housing by a first bearing and a second bearing; A first impeller is operably connected to the shaft at a first end of the shaft; A second impeller is operably connected to the shaft at a second end of the shaft; A cooling passage, defined by the compressor housing and fluidly connected to a coolant inlet passage, comprising a first portion and a second portion such that an inlet coolant flow is divided into a first coolant flow along the first portion and a second coolant flow along the second portion, wherein the first coolant flow is delivered to the first bearing and the second coolant flow is delivered to the second bearing; and A motor operably connected to the shaft, wherein the motor includes: Rotor, the rotor being connected to the shaft; A stator, the stator comprising an annular hub and a plurality of stator teeth extending radially inward from the hub, wherein the stator teeth are circumferentially spaced apart to define a plurality of winding slots between the stator teeth; and A stator winding, wherein the stator winding is positioned in each of the winding slots and wound around at least one of the stator teeth; Each stator tooth includes: A winding tooth portion, the winding tooth portion extending along at least one winding slot in the winding slots and defining at least one winding slot in the winding slots; and The cooling fin portion extends radially inward from the winding tooth portion, wherein the cooling fin portion of each stator tooth is circumferentially spaced from the other cooling fin portions to define a plurality of stator cooling channels between the cooling fin portions, wherein each stator cooling channel has no stator winding to receive a portion of the second coolant flow after the second coolant flow is delivered to the second bearing.

12. The compressor according to claim 11, wherein, Each cooling fin section is elongated in the radial direction and has a radial length greater than its radial thickness.

13. The compressor according to claim 11, wherein, Each cooling fin portion has a thickness no greater than the thickness of each winding tooth portion in the winding tooth portion.

14. The compressor according to claim 11, wherein, The cooling fin portion and the stator cooling channel extend the entire axial length of the stator.

15. The compressor according to claim 11, wherein, Each cooling fin section has a thickness between 3 mm and 5 mm.

16. The compressor according to claim 11, wherein, The cooling fin portion and the winding tooth portion of each stator tooth have a common axial length, such that the axial inlet of each stator cooling channel shares a common end with the first axial end of each winding tooth portion, and the axial outlet of each stator cooling channel shares a common end with the second axial end of each winding tooth portion.

17. The compressor according to claim 11, wherein, Each cooling fin portion has a radial thickness that is approximately constant along the radial length of the cooling fin portion.

18. The compressor according to claim 11, wherein, Each cooling fin portion is integrally formed with the winding tooth portion.

19. The compressor according to claim 11, wherein, The cooling channel extends spirally around the motor, and each of the first and second portions includes a plurality of channel deflectors around the motor, wherein the first portion includes more channel deflectors than the second portion.

20. A refrigeration system, comprising: Evaporator; Condenser; Expansion device; A coolant supply line is connected to the condenser in fluid communication to receive coolant from the condenser; as well as The compressor includes: The compressor housing defines a coolant inlet connected to the coolant supply line; A motor, the motor comprising: A stator, the stator comprising an annular hub and a plurality of stator teeth extending radially inward from the hub, wherein the stator teeth are circumferentially spaced apart to define a plurality of winding slots between the stator teeth; and A stator winding, wherein the stator winding is positioned in each of the winding slots and wound around at least one of the stator teeth; Each stator tooth includes: A winding tooth portion, the winding tooth portion extending along at least one winding slot in the winding slots and defining at least one winding slot in the winding slots; and The cooling fin portion extends radially inward from the winding tooth portion, wherein the cooling fin portion of each stator tooth is circumferentially spaced from the other cooling fin portions to define a plurality of cooling channels between the cooling fin portions for guiding coolant through the motor, wherein each cooling channel extends a certain radial length from the winding tooth portion toward the distal end of the cooling fin portion, and wherein each cooling channel has no stator winding to receive coolant from the coolant supply line.

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