Two piece split scroll for a centrifugal compressor

Abstract

A centrifugal compressor assembly is provided.SOLUTION: The centrifugal compressor assembly includes a scroll assembly having a suction plate defining an inlet flow path, a suction plate housing, a diffuser plate, and a collector. The suction plate is removably coupled to the suction plate housing, the suction plate housing is removably coupled to the collector, and the diffuser plate is removably coupled to the collector. The centrifugal compressor assembly further includes an impeller rotatably mounted to the scroll assembly for compressing fluid introduced through the inlet flow path and a variable geometry diffuser system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of U.S. Provisional Patent Application No. 62 / 562,6 filed September 25, 2017. No. 66, and U.S. Provisional Patent Application No. 62 / 612, filed December 29, 2017. The entire disclosure of each application is incorporated herein by reference. Be absorbed. [Background technology]

[0002] Buildings can include heating, ventilation, and air conditioning (HVAC) systems. Summary of the Invention [Means for solving the problem]

[0003] One implementation of the present disclosure is a centrifugal compressor assembly. The centrifugal compressor assembly includes: a suction plate defining an inlet flow path; a suction plate housing; and a diffuser plate. The suction plate includes a scroll assembly having a suction plate housing. the suction plate housing is removably connected to the collector. The centrifugal compressor assembly is configured to include a diffuser plate removably coupled to the collector. , which rotates in the scroll assembly to compress the fluid introduced through the inlet passage. The system further includes a variable geometry diffusion system and an impeller mounted thereto.

[0004] The suction plate comprises a suction base plate having an outer suction flange and a suction base plate. a first suction annular portion extending in a first axial direction from the suction base plate; and a second suction ring extending in the direction of the suction plate housing. a housing base plate having a housing flange; and a first housing annular portion extending in a first axial direction from the suction plate. The outer suction flange is attached to the first half of the suction plate housing using multiple fasteners. The collector may be coupled to the housing annulus. The collector may include a first axial flange, an impeller a body portion defining an outlet flow path for fluid flow exiting the body portion, and a second axial flange. The outer housing flange of the suction plate housing is secured with multiple fasteners. can be used to couple to the first axial flange of the collector.

[0005] The variable geometry diffusion system is rotatable between a first position and a second position by an actuator. a rotatable drive ring and a diffusion ring coupled to the drive ring using drive pins. The drive ring moves the diffuser ring between a retracted position and an extended position. The long position is where the fluid flow exiting the impeller flows through the diffusion gap downstream of the impeller. Suction plate, suction plate housing, diffusion plate and at least one of the collectors can be formed using a casting process. The fluid to be compressed may be a refrigerant. The refrigerant may be R1233zd.

[0006] Another implementation of the present disclosure is a centrifugal compressor assembly. A scroll assembly having a first scroll component and a second scroll component. The first scroll component includes an outer flange and a first scroll member defining an inlet flow passage. The second scroll component includes an axial flange and an annular portion extending axially therefrom. and a body portion defining an outlet passage. The outer flange of the first scroll component includes a plurality of A fastener may be used to connect to the axial flange of the second scroll component. The centrifugal compressor assembly includes a compressor for compressing a fluid introduced through an inlet passage. It further includes an impeller rotatably mounted on the scroll assembly.

[0007] The fluid to be compressed may be a refrigerant. The fasteners connecting the components may be located outside the fluid inlet flow path. At least one of the first scroll component and the second scroll component is cast. The first scroll component may be formed using a process upstream of the impeller. The inlet bails may be connected to multiple inlet bails arranged in a

[0008] Yet another implementation of the present disclosure is a centrifugal compressor assembly. a scroll assembly having a first scroll element and a second scroll element; The second scroll component has a substantially plate-like shape. The scroll component is detachably attached to the first scroll component using a plurality of fasteners. The centrifugal compressor assembly is introduced through an inlet passage. an impeller rotatably mounted on the scroll assembly for compressing the fluid; , and a diffusion system.

[0009] The fasteners connecting the first scroll component to the second scroll component are The second scroll component can be removed to position the second scroll component outside the inlet flow path. This may allow users to access components of the diffusion system. The scroll assembly is coupled to a second scroll element and has a plurality of blades. The first scroll element and the second scroll element may include a flow straightener. At least one of the elements may be formed using a casting process. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a chiller assembly, according to some embodiments.

[0011] [Figure 2] FIG. 2 is an elevational view of the chiller assembly of FIG. 1 according to some embodiments.

[0012] [Figure 3] FIG. 3 is a perspective view of a two-piece split scroll assembly for a centrifugal compressor, according to some embodiments.

[0013] [Figure 4] FIG. 4 is a perspective view of a two-piece split scroll assembly with the front cover portion of the scroll assembly removed, according to some embodiments.

[0014] [Figure 5] FIG. 5 is a perspective view of a multi-component scroll assembly, according to some embodiments.

[0015] [Figure 6] FIG. 6 is a cross-sectional view of the multi-component scroll assembly of FIG. 5 according to some embodiments.

[0016] [Figure 7] FIG. 7 is a detailed cross-sectional view of the multi-component scroll assembly of FIG. 6, according to some embodiments.

[0017] [Figure 8] FIG. 8 is a perspective view of a suction plate used in the multi-component scroll assembly of FIG. 5, according to some embodiments.

[0018] [Figure 9] FIG. 9 is a perspective view of a suction plate housing used in the multi-component scroll assembly of FIG. 5, according to some embodiments.

[0019] [Figure 10] FIG. 10 is a perspective view of a diffuser plate used in the multi-component scroll assembly of FIG. 5 according to some embodiments.

[0020] [Figure 11] FIG. 11 is a perspective view of a collector used in the multi-component scroll assembly of FIG. 5 according to some embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0021] Generally, referring to the drawings, there is shown a centrifugal compressor having a two-part split scroll or collector. A centrifugal compressor is used in applications where a fluid, such as a chiller, needs to be compressed. This is useful in a variety of devices where compression is required. utilizes a rotating component to convert angular momentum into a static pressure increase within the fluid.

[0022] A centrifugal compressor consists of four main components: an inlet, an impeller, a diffuser, and The inlet may include a collector or volute. It can include a simple pipe that draws fluid into the compressor and delivers it to the impeller. In some cases, the inlet ensures axial flow of fluid to the impeller inlet. The impeller may include an inlet guide vane. from the outer edge of the impeller (also known as the impeller tip) It is a set of rotating blades that gradually increase the energy of the fluid as it moves through the Downstream of the impeller in the flow path is a diffuser mechanism that slows the fluid, thereby slowing its movement. It acts to convert kinetic energy into static energy. Upon exiting the diffuser, the fluid The fluid enters the collector or volute where, due to the shape of the collector or volute, the kinetic energy Further conversion of energy into static pressure occurs.

[0023] The scroll or outer housing of a centrifugal compressor may be manufactured as a single component. However, this has the drawback of being difficult to manufacture using, for example, a casting process. Can be a large and expensive component. Significant size, weight, and cost of parts In addition, the scroll's one-piece design allows the entire scroll to be aligned during installation. This can make assembly and maintenance of the compressor difficult, as it may be necessary to go through The entire scroll must be removed to access the impeller and / or diffuser during operation. Compressor scroll designs that eliminate or minimize these problems may be needed. may be useful.

[0024] 1-2, an exemplary implementation of a chiller assembly 100 is shown. The chiller assembly 100 includes a compressor 102 driven by an electric motor 104; The refrigerant is shown to include a condenser 106 and an evaporator 108. The refrigerant is compressed in a vapor compression cycle. The chiller assembly 100 also 1 includes a control panel 114 for controlling the operation of the vapor compression cycle within the compressor assembly 100. It can be seen.

[0025] The electric motor 104 may be powered by a variable speed drive (VSD) 110. 0 is supplied with an AC power source (not shown) having a specific fixed line voltage and fixed line frequency. The inverter receives AC power and provides power to the motor 104 with variable voltage and frequency. The motive motor 104 can be any type of electric motor that can be powered by the VSD 110. For example, the electric motor 104 may be a high-speed induction motor. evaporator 108 via suction line 112. The refrigerant vapor is delivered to the condenser 106 via line 124. The compressor 102 may be a centrifugal compressor, a spin compressor, or a A screw compressor, scroll compressor, turbine compressor or any other type of suitable In the embodiment shown in the drawings, compressor 102 is a centrifugal compressor.

[0026] The evaporator 108 includes an internal tube bundle (not shown) and a propeller. a supply line 120 for supplying process fluid from the inner tube bundle; and a return line 122 for discharging the supply line 120. The supply line 120 and the return line 122 , through conduits that circulate process fluids to components within the HVAC system (e.g., air The process fluid may be a cooling fluid for cooling the building, such as water. , ethylene glycol, calcium chloride brine, sodium chloride brine or any other The evaporator 108 is a device for evaporating a process fluid into a vapor. The temperature of the process fluid increases as it passes through the tube bundle of the generator 108 and exchanges heat with the refrigerant. The refrigerant liquid is delivered to the evaporator 108 to exchange heat with the process fluid. The refrigerant vapor is formed in the evaporator 108 by undergoing a phase change to a refrigerant vapor.

[0027] The refrigerant vapor delivered by the compressor 102 to the condenser 106 transfers heat to the fluid. The vapor condenses into a refrigerant liquid in the condenser 106 as a result of heat transfer with the fluid. The refrigerant liquid flows through an expansion device and is returned to the evaporator 108 to form the chiller assembly 10. The refrigerant cycle of 0 is completed. The condenser 106 is connected to the outside of the HVAC system. a supply line 116 for circulating fluid between the cooling tower and other components; The fluid supplied to the condenser 106 via the return line 118 is The refrigerant exchanges heat with the refrigerant in the condenser 106 and is discharged from the condenser 106 via a supply line 116. The fluid circulating through the condenser 106 may be water or any other suitable liquid. It can be a body.

[0028] The refrigerant may have an operating pressure of, for example, less than 400 kPa or about 58 psi. In some embodiments, the refrigerant is R1233zd. R1233zd is a commercially available refrigerant. Non-flammable with a lower Global Warming Potential (GWP) than other refrigerants used in the cooler assembly GWP is the ratio of the amount of carbon dioxide emitted to the amount of gas emitted. By quantifying the amount of energy absorbed by gas emissions over a period of time, the geographical distribution of different gases can be It is a scale developed to allow comparison of the effects of global warming.

[0029] Referring now to FIG. 3, a two-piece split screw for a centrifugal compressor is shown, in accordance with some embodiments. The roll assembly is shown. The compressor 102 is coupled to an electric motor 104. The compressor 102 may be driven by a first scroll element 202 and a second scroll element 204. 204. The scroll or collector section 204 is shown to include a scroll or collector section 204. The first scroll element 202 and the second scroll element are integral scroll elements. In contrast to the sophisticated core casting process required by the design, It can be cast as a separate part using a "green sand" casting process. The scroll component 202 and the second scroll component 204 comprise, among other components: The impeller and variable geometry diffuser (VGD) are described in more detail with reference to Figures 4 and 7 below. In some embodiments, the first scrolling mechanism is configured to accommodate the system. The component 202 may be known as a suction plate housing.

[0030] The second scroll element 204 has a substantially plate-like shape and is secured to the fastener 20. 6 to the first scroll component. In some embodiments, the second scroll component The crawl component 204 may be referred to as a suction plate. Removably coupling one scroll element 202 to a second scroll element 204 Any suitable type of fastener (e.g., bolt, screw, pin) that can be utilized to In various embodiments, the two-part split scroll may be a first scroll configuration Any necessary couplings to properly couple element 202 to second scroll element 204. The pattern may include any number of fasteners 206. Importantly, fasteners 206 106 is outside the flow path of the refrigerant fluid as it passes through the compressor 102 and therefore and oriented so as not to obstruct the flow path, thereby preventing any potential degradation of the performance of the compressor 102. In contrast, the flow path obstructed by the fasteners prevents eddy currents and boundary layer separation. may experience flow irregularities, including pressure losses in the compressor 102. Pressure losses can lead to unsteady flow or even stall conditions, which can This can significantly reduce the efficiency of the compressor 102.

[0031] The second scroll element 204 may be coupled to a flow straightener 208. The row rectifier 208 can be a component having multiple blades. It can be installed upstream to ensure axial flow of fluid at the impeller inlet. , thereby improving the performance of the compressor 102.

[0032] Referring now to FIG. 4, the diagram of the two-piece split scroll assembly of FIG. 3 is now shown with the second scroll. The roll component 204 is shown removed. 02 includes a variable geometry diffuser (VGD) system with a drive ring 210. The VGD system can accommodate various components of the impeller 216. The drive ring 210 is configured to stabilize the fluid flow. an actuation mechanism or actuator 212 coupled to the drive ring 210 via 214; The actuation mechanism 212 may include a diffusion ring (not shown) coupled to the drive ring 210. , moving the drive ring 210 between the first and second positions via a linkage 214. The movement of the drive ring 210 then causes the impeller outlet to be a storage position in which fluid flow through the diffusion gap is substantially unimpeded; The diffusion ring is moved between an extended position where fluid flow through the ring is substantially or completely blocked. Move.

[0033] The two-part design of the scroll assembly offers several advantages over the one-piece scroll design: If it is not a two-part scroll, the compressor assembly engineer will The linkage 212 must be connected to the actuation mechanism through a small access hole located in the This can result in a difficult and time-consuming assembly process. By fastening the second scroll element 204 to the first scroll element 202 During installation, the VGD system may include the final step in the compressor assembly process. The second scroll element 204 provides easy access to all the components of the system. The impeller can be removed in response to signs of impeller failure, so the impeller Replace before damage to the scroll assembly occurs, which can result in scrapping the entire assembly. Similarly, both the impeller and the VGD system can be replaced or repaired. It can be maintained or repaired without the need to remove the O4. In addition, the two-part scroll design The exposed gas flow paths of the meter provide several manufacturing advantages. The foundry that casts the first scroll component 202 and the second scroll component 204 is located in the gas flow path. Manufacturing techniques that result in a better (e.g., smoother) surface finish can be used. A smoother surface finish can result in better aerodynamic performance of the compressor. This allows for improved compressor efficiency.

[0034] While the scroll assembly has been detailed above with reference to a two-part design, it is also possible to design with three or more scrolls. Other scroll assembly designs that include roll components are also within the scope of this disclosure. For example, the first scroll element 202 may be permanently attached or may be attached to one another. It can be most easily manufactured as two or more separate parts that are releasably joined.

[0035] A multi-component scroll implementation is shown in the perspective view of FIG. The roller assembly 300 includes, among other components, a suction plate housing 302 and a suction The filter may include a pull plate 304 and a collector 308, each of which may be a separate structure. The separate components 302, 304, and 306 can then be fabricated as a single component. 8 may be permanently or removably coupled to one another. The suction plate housing 302 may be the same as or substantially the same as the first scroll component 202. Similarly, the suction plate 304 is the same as the second scroll described above with reference to FIGS. The actuation mechanism or actuator 310 is the same as or substantially similar to component 204. The suction plate may be attached adjacent to the outer surface of the housing 302 and the suction portion 304. The actuation mechanism 310 is a diffusion system housed within the multi-component scroll assembly 300. The drive ring may be coupled to the drive ring of the drive shaft.

[0036] With particular reference to FIGS. 6-7, a multi-component split scroll, according to some embodiments, A cross-sectional view of assembly 300 is shown. Multi-component split scroll assembly 300 The passage of the refrigerant through the impeller may be as follows: through a central inlet passage 312 formed by the suction plate 304 which feeds In some embodiments, the central inlet passage 312 may be The diameter may gradually decrease to direct fluid flow to the center of the impeller 314. 4 is the energy of the fluid as it moves from the center of the impeller 314 to the outer peripheral edge. In some embodiments, the rotor may include a set of rotating vanes that gradually raise the rotor. The impeller 314 is directly driven by the electric motor 104 using a drive connection 326. Downstream of the impeller 314 in the flow path is a diffusion gap 318. at least partially on the surfaces of the suction plate housing 302 and the diffusion plate 306 It may be formed by:

[0037] The size of the diffusion gap 318 may vary based on the position of the diffusion ring 324 . The diffusion ring 324 can be positioned in a fully retracted position where flow through the diffusion gap 318 is unimpeded; a fully extended position where flow through the diffusion gap 318 is substantially or completely blocked; The position of the diffuser ring 324 can be controlled by the rotation of the drive ring 316 and Corresponding drive pins 322 used to couple diffusion ring 324 to drive ring 316 The rotation of the drive ring 316 can be changed through the movement of the actuator (e.g. This can be achieved by adjusting the shape of the diffuser at the impeller outlet. By changing the It can be suppressed.

[0038] After traveling through the diffusion gap 318, the fluid enters the collector passages 320 of the collector 308. The collector passage 320 is implemented for the flow path of the fluid exiting the impeller 314. Because they extend in qualitatively orthogonal directions, the collector 308 can be folded or rolled back. The folded collector passages may be known as folded collectors. This reduces the size and therefore may allow for easier transportation of the chiller assembly, but is a single part. Folded collectors require complex manufacturing processes and are difficult to access for cleaning. These drawbacks can be attributed to the many applications where the flow path area is easily exposed for cleaning purposes after fabrication. This can be minimized by the scroll element. This allows for manufacturing methods that produce smoother flowpath surface finishes, resulting in improved compressor Multi-component folded collectors are easier to maintain and clean in the field. The collector passage 320 is advantageous due to its ability to be partially disassembled for cleaning. The diffuser 314 may extend completely or substantially completely 360° around the impeller 314. A gap 318 is configured to collect the fluid exiting the gap 318 and direct the fluid to the discharge outlet of the compressor 102. In some embodiments, the fluid flows along the entire length of the collector passage 320. As the collector passage 320 moves, it may have a non-uniform cross section. has a non-uniform cross-sectional area, the passage may be called a volute rather than a collector.

[0039] Referring now to FIG. 8, a suction plate 800 that may be utilized in a multi-component scroll is shown. In various embodiments, the suction plate 800 is shown in a perspective view. The suction plate 304 may be the same as or substantially similar to the suction plate 304 described above. 800 may include a base plate 802 having an outer flange 814. The ridge 804 extends from the base plate 802 in a first axial direction (i.e., the intake duct of the compressor 102). The second annular portion 806 extends from the base plate 802 toward the first annular portion 806. 2. In summary, the base plate 802, the first annular portion 8 The first annulus 804 and the second annulus 806 direct the refrigerant flow into the compressor 102 and towards the impeller. The inner wall defines a central inlet passage 808 therein.

[0040] The first annular portion 804 has a plurality of holes 810 disposed radially outward of the central passage 808. In the embodiment shown in Figure 8, holes 810 are adapted to receive threaded fasteners. The threaded fastener is a blind tapped hole configured to allow the suction inlet (e.g. 1-2) to couple the suction inlet 112 to the first annular portion 804. In some embodiments, a flow straightener (e.g., For example, a flow straightener 208, described above with reference to FIG. 3, is coupled to the first annular portion 804. That's fine.

[0041] The base plate 802 includes a plurality of holes 812 distributed around an outer flange 814. In the embodiment shown in FIG. 8, the holes 812 are through holes. 12 and a fastener (e.g., a bolt, a screw) is inserted through the In some embodiments, the screw holes can be secured to the suction plate housing. The hole 908 may be a feature of the ring 900 (i.e., hole 908, which is described in more detail below). The orientation and position of 810 and 812 allows the components of the multi-component scroll to be aligned with the central interface. 808 is used to connect the flow path to the inlet flow path outside the flow path in parallel. This allows for placement of fasteners that can be easily removed, reducing the possibility of irregular flow that can lead to poor performance. The suction plate 800 is required to join the components of the multi-component scroll. The hole 810 and hole 812 may include any number and pattern of holes as desired.

[0042] Referring now to FIG. 9, a suction plate housing that may be utilized in a multi-component scroll is shown. 9 shows a perspective view of the suction plate housing 900. In various embodiments, the suction plate housing 900 is the same as or substantially the same as the suction plate housing 302 described above with reference to FIGS. 5 to 7. The suction plate housing 900 has an outer flange 916 and an inner flange The first annular portion 904 may include a base plate 902 having a flange 912. The first annular portion extends in a first axial direction from the base plate 902. 904 may define a central volume region 906. When fully assembled, the central volume 906 is a portion of the suction plate ( For example, the second annular portion 806 described above with reference to FIG. 8), and components of the VGD (e.g. , and drive ring 316 described above with reference to Figures 6-7.

[0043] The first annular portion 904 has a plurality of holes 90 disposed radially outward of a central volume region 906. 8. In the embodiment shown in FIG. 9, the hole 908 is The threaded fastener is a blind tapped hole configured to receive a suction press. Holes 908 are provided for coupling a port (e.g., suction plate 800) to the first annular portion 904. can be screwed into.

[0044] The base plate 902 also has a plurality of holes 910 distributed around an outer flange 916. and a plurality of holes 914 distributed around the inner flange 912. In the embodiment shown in Figure 9, hole 910 is a through hole, while hole 914 is a threaded hole. A fastener (e.g., a bolt, a screw) is inserted through 910 and placed on another component. In some embodiments, the screw holes can be secured to the collector 110. 0 (i.e., hole 1110, described in more detail below). It may be used to couple components of the VGD to the suction plate housing 900. The plate housing 900 is required to join the components of the multi-component scroll. The hole 908, 910, and 914 may include any number and pattern of holes.

[0045] Referring now to FIG. 10, a diffuser plate 100 that may be utilized in a multi-component scroll is shown. 5-7. In various embodiments, the diffuser plate 1000 is The diffuser plate 306 may be the same as or substantially similar to the diffuser plate 306 described above with reference to Plate 1000 is shown to include a base plate 1002 and a first annular portion 1004. In various embodiments, the first annular portion 1004 may be a collector (e.g., a collector 1100) to the first annular portion 1004. include.

[0046] In some embodiments, the diffusion vanes 1006 are stationary relative to the base plate 1002. In other embodiments, an actuation mechanism is utilized to expand the base plate 1002. The direction of the diffuser vane 1006 can be rotated. Before the fluid leaves the compressor 102 through the collector, the kinetic energy of the high-velocity fluid is converted into static pressure. The diffusion vanes 1006 are arranged around the central passage 1008. The central passage 1008 may be a mechanical connection (e.g., a drive connection) between the electric motor and the impeller. A connecting member 326) can be provided.

[0047] Referring now to FIG. 11, a collector 1100 that may be utilized in a multi-component scroll is shown. In various embodiments, the collector 1100 may be any of the collectors shown in FIGS. The collector 1100 may be the same as or substantially similar to the collector 308 described above. , a first axial flange 1102, a body portion 1104, and a second axial flange 1106. is shown to include

[0048] The body portion 1104 defines a complete or substantially complete 360° flow path to the discharge portion 1112. In the implementation shown in FIG. 11, the body portion 1104 defines a collector passage. 1114 may be connected to the emitter 1112. In some embodiments, the emitter 1112 has a substantially frusto-conical shape with a gradually increasing diameter. , and may terminate in a discharge flange 1116. The discharge flange 1116 may have a plurality of holes 1118 to connect to a discharge line (e.g., discharge line 124 described above with reference to Figures 1-2). They may be combined.

[0049] The first axial flange 1102 is shown to include a plurality of holes 1110. In the embodiment shown in FIG. 1, the holes 1110 are configured to receive threaded fasteners. The threaded fastener is attached to the suction plate housing (e.g., To couple the plate housing 900 to the first axial flange 1102, holes 11 The second axial flange 1106 may be threaded into the axial flange 1104. The second axial flange 1106 may include a plurality of holes 1108. In the embodiment shown in Figure 11, the holes 1108 are through holes. A fastener (e.g., a bolt, a screw) is inserted through the 8 and placed on another component. In some embodiments, the screw holes can be fixed to the diffuser plate 100. 0 feature. The collector 1100 combines the components of the multi-component scroll. The holes 1108, 1110, and 1118 may be in any number and pattern required for That's fine too.

[0050] In various embodiments, the suction plate 800, the suction plate housing 900, the diffusion plate The port 1000 and / or the collector 1100 may be made of any suitable material. , can be manufactured using a casting process. As described above with reference to FIG. The process may be a "green sand" casting process. Certain components (e.g., suction plate 800 and suction plate housing 900) Other components of the multi-component scroll assembly as described above may be manufactured as a unitary component. The collector 1100 may be coupled to a component (e.g., collector 1100).

[0051] The construction and configuration of the systems and methods shown in the various exemplary embodiments are Although only exemplary embodiments have been described in detail in this disclosure, many modifications may be made. The shape, size, dimensions, structure, shape and proportions of the various elements, parameters (changing values, mounting configurations, material use, color, orientation, etc.) For example, reversing the position of an element or otherwise vary, changing the nature or number of individual elements or positions. Accordingly, such modifications are intended to be included within the scope of this disclosure. The order or sequence of any process or method steps is intended to be consistent with alternatives. may be modified or reordered according to various embodiments without departing from the scope of the present disclosure. Other substitutions, modifications, and variations in the design, operating conditions, and configuration of the exemplary embodiments. and abbreviations may be made.

Claims

1. 1. A scroll assembly comprising: a suction plate defining an inlet flow path; a suction plate housing; A diffusion plate; a scroll assembly comprising: The scroll assembly is adapted to compress fluid introduced through the inlet passage. an impeller rotatably mounted on the a variable geometry diffusion system; The suction plate is removably coupled to the suction plate housing, The suction plate housing is removably coupled to the collector, and the diffusion plate a suction plate removably coupled to the collector; Machine assembly.

2. The suction plate is a suction base plate having an outer suction flange; a first suction annulus extending in a first axial direction from the suction base plate; a second suction annular portion extending in a second axial direction from the suction base plate.

2. The centrifugal compressor assembly of claim 1.

3. The suction plate housing a housing base plate having an outer housing flange; a first housing annular portion extending from the housing base plate in the first axial direction; The centrifugal compressor assembly of claim 2 , comprising:

4. The outer suction flange of the suction plate is secured to the suction plate using a first plurality of fasteners.

4. The pull plate of claim 3, wherein the pull plate is coupled to the first housing annular portion of the housing. Centrifugal compressor assembly.

5. The collector is a first axial flange; a body defining a discharge passage for fluid flow exiting the impeller; The centrifugal compressor assembly of claim 4 , further comprising: a second axial flange.

6. The outer housing flange of the suction plate housing is secured with a second plurality of fasteners.

6. The method of claim 5, wherein the collector is coupled to the first axial flange using a Centrifugal compressor assembly.

7. the variable geometry diffusion system is a drive ring rotatable by an actuator between a first position and a second position; a diffusion ring coupled to said drive ring using drive pins, said drive ring configured to move the diffusion ring between a retracted position and an extended position, However, the fluid flow exiting the impeller flows through a diffusion gap downstream of the impeller. and a diffusion ring that substantially blocks the flow of the centrifugal compressor according to claim 1 . Machine assembly.

8. The suction plate, the suction plate housing, the diffusion plate, and the collector 10. The method of claim 1, wherein at least one of the rotors is formed using a casting process. Centrifugal compressor assembly.

9. The centrifugal compressor assembly of claim 1 , wherein the fluid is a refrigerant.

10. 10. The centrifugal compressor assembly of claim 9, wherein the refrigerant is R1233zd.

11. 1. A scroll assembly comprising: an outer flange; and a first axially extending annular portion defining an inlet flow passage. a first scrolling component; a second scroll component including an axial flange and a body portion defining a discharge passage; a scroll assembly comprising: The scroll assembly is adapted to compress fluid introduced through the inlet passage. an impeller rotatably mounted on the a plurality of fasteners coupled to the axial flange of the second scroll component; and the outer flange of the first scroll component. Li.

12. The centrifugal compressor assembly of claim 11 , wherein the fluid is a refrigerant.

13. the plurality of fasteners are disposed outside the inlet flow path of the fluid. Item 12. A centrifugal compressor assembly according to item 11.

14. At least one of the first scroll component and the second scroll component 12. The centrifugal compressor assembly of claim 11, wherein one is formed using a casting process. Yellowtail.

15. The first scroll element has a plurality of inlets disposed upstream of the impeller. The centrifugal compressor assembly of claim 11 coupled to a bail.

16. 1. A centrifugal compressor assembly comprising: Scroll assembly comprising a first scroll component and a second scroll component wherein the second scroll component has a substantially plate-like shape. a roller assembly; a scroll assembly for compressing a fluid introduced through an inlet passage; a rotatably mounted impeller; A diffusion system; the first scroll component removably coupled to the second scroll component by a plurality of fasteners; a second scroll component.

17. the plurality of fasteners are disposed outside the inlet flow path of the fluid. Item 17. A centrifugal compressor assembly according to item 16.

18. Removing the second scroll component allows the user to reconfigure the diffusion system.

17. The centrifugal compressor assembly of claim 16, wherein the centrifugal compressor assembly allows access to components.

19. The scroll assembly further includes a flow straightener having a plurality of vanes, 17. The centrifugal separator of claim 16, wherein a flow straightener is coupled to the second scroll component. Compressor assembly.

20. At least one of the first scroll component and the second scroll component 17. The centrifugal compressor assembly of claim 16, wherein one is formed using a casting process. Yellowtail.

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