A centrifugal compressor

Abstract

The application provides a centrifugal compressor and relates to the technical field of compressors.The centrifugal compressor comprises a primary centrifugal compression assembly, a secondary centrifugal compression assembly and a motor, the primary centrifugal compression assembly and the secondary centrifugal compression assembly are arranged at two ends of the motor and are connected with the motor, the motor comprises a casing and a motor assembly in the casing, a heat dissipation cavity is arranged on the side wall of the casing, a gas guide pipe is arranged in the heat dissipation cavity, the gas guide pipe is connected and communicated with exhaust holes of the primary centrifugal compression assembly and air inlet holes of the secondary centrifugal compression assembly, and a water flow loop is arranged in the heat dissipation cavity.The cooling water of the water flow loop can cool the gas guide pipe and the motor assembly simultaneously, so that the defect that the stator of the motor and the exhaust of the primary centrifugal compressor are cooled respectively and the cost is high in the prior art is overcome, and the cooling process is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to a centrifugal compressor. BACKGROUND

[0002] At present, centrifugal compressors are widely used in large chemical industry. When the centrifugal compressor works, part of the energy is converted into heat. The heat greatly restricts the normal operation of the centrifugal compressor.

[0003] Most of the motors directly connected with high-speed centrifugal compressors adopt high-speed magnetic suspension motors or high-speed air suspension motors. Such motors have the characteristics of high speed, high energy density and small size, so the heat generated in unit volume is large, and cooling water must be used for cooling. The volume of the centrifugal compressor decreases and the temperature rises during the working process. In order to improve the compression efficiency, reduce the power consumption and ensure that the secondary exhaust temperature is not too high, the exhaust temperature of the primary centrifugal machine must be cooled to the required value before entering the secondary centrifugal machine. The cooling process also needs a cooler. At present, the water cooler with good cooling effect and economy is on the market.

[0004] The cooling of the above-mentioned motor is realized by setting a heat dissipation liquid tank, a liquid inlet and a liquid outlet in the motor. As shown in Figure 1 The liquid outlet and the liquid inlet are respectively connected with both ends of the heat dissipation liquid tank, and the cold liquid enters the heat dissipation liquid tank from the liquid inlet and then flows out from the liquid outlet, so as to cool the stator in the motor. In order to prevent the secondary exhaust temperature from being too high, a water cooler is usually connected with the exhaust hole of the primary centrifugal compressor, and the water cooler is also in communication with the air inlet hole of the secondary centrifugal compressor, so as to ensure that the secondary exhaust temperature is not too high.

[0005] The above two cooling methods are two separate processes, and the cost is high. How to ensure the cooling effect and reduce the cost has become a technical problem to be solved by the technical personnel in the field. SUMMARY

[0006] Therefore, the purpose of the present application is to provide a centrifugal compressor to solve the technical problem that two cooling methods are used to cool the stator of the motor and the exhaust of the primary centrifugal compressor respectively in the prior art, and the process is complex, resulting in high manufacturing cost.

[0007] In order to achieve the above object, the application provides a centrifugal compressor, comprising a primary centrifugal compression assembly, a secondary centrifugal compression assembly and a motor, the primary centrifugal compression assembly and the secondary centrifugal compression assembly are arranged at two ends of the motor and connected with the motor, the motor comprises a casing and a motor assembly in the casing, a heat dissipation cavity is arranged on the side wall of the casing, a gas guide pipe is arranged in the heat dissipation cavity, the gas guide pipe is connected with the exhaust hole of the primary centrifugal compression assembly and the air inlet hole of the secondary centrifugal compression assembly at the same time, and a water flow loop is arranged in the heat dissipation cavity, and the cooling water of the water flow loop cools the gas guide pipe and the motor assembly at the same time.

[0008] According to an optional embodiment, two sides of the heat dissipation cavity are respectively provided with a gas distribution cavity communicated with the exhaust hole of the primary centrifugal compression assembly and a gas collection cavity communicated with the air inlet hole of the secondary centrifugal compression assembly.

[0009] According to an optional embodiment, a first partition plate is arranged between the heat dissipation cavity and the gas distribution cavity, and a second partition plate is arranged between the heat dissipation cavity and the gas collection cavity.

[0010] According to an optional embodiment, the gas guide pipe comprises a plurality of pipes, and two ends of the pipes are respectively fixed on the first partition plate and the second partition plate, and the inner cavities of the pipes are communicated with the gas distribution cavity and the gas collection cavity at the same time.

[0011] According to an optional embodiment, a water inlet and a water return are arranged on the side wall of the heat dissipation cavity, and the water inlet and the water return are spaced apart by a preset distance.

[0012] According to an optional embodiment, a water jacket and a water distribution plate are arranged in the heat dissipation cavity, and the water jacket and the water distribution plate combine to divide the heat dissipation cavity into two independent cavities.

[0013] According to an optional embodiment, the water jacket is annular and is sleeved on the outer wall of the motor assembly.

[0014] According to an optional embodiment, the water distribution plate comprises a first water distribution plate and a second water distribution plate, the first water distribution plate and the second water distribution plate are respectively arranged at two ends of the water jacket and are arranged along the radial direction of the heat dissipation cavity, surfaces of the first water distribution plate and the second water distribution plate are respectively provided with a plurality of fixing holes corresponding to the number of the gas guide pipes, and the gas guide pipes pass through the fixing holes.

[0015] According to an optional embodiment, the first water distribution plate is close to the water inlet, and the water flow of the water inlet is divided into two paths, one path is used for cooling the gas guide pipe, and the other path is used for cooling the motor assembly, the second water distribution plate is close to the water return, and the two paths of water flow converge at the water return.

[0016] According to an optional embodiment, the first water distribution plate moves back and forth along the axial direction of the heat dissipation cavity near the water inlet, and the second water distribution plate moves back and forth along the axial direction of the heat dissipation cavity near the water outlet.

[0017] The centrifugal compressor provided by the application has the following technical effects.

[0018] The centrifugal compressor has the same structure as the conventional compressor, i.e., comprising a primary centrifugal compression assembly, a secondary centrifugal compression assembly and a motor, the primary centrifugal compression assembly and the secondary centrifugal compression assembly are arranged at two ends of the motor and connected with the motor, the motor comprises a casing and a motor assembly in the casing, and the centrifugal compressor is different from the conventional compressor in that a heat dissipation cavity is arranged on the side wall of the casing, a gas guide pipe is arranged in the heat dissipation cavity, the gas guide pipe is connected and communicated with an exhaust hole of the primary centrifugal compression assembly and an air inlet hole of the secondary centrifugal compression assembly, and a water flow loop is arranged in the heat dissipation cavity, the cooling water of the water flow loop can cool the gas guide pipe and the motor assembly at the same time, so that the defect that the stator of the motor and the exhaust of the primary centrifugal compressor are cooled separately to result in high cost in the prior art is overcome, and the cooling process is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0020] Figure 1 is a schematic diagram of the cooling structure of the motor in the prior art;

[0021] Figure 2 is a schematic diagram of the cross-sectional structure of the centrifugal compressor in an embodiment of the present application;

[0022] Figure 3 is Figure 2 is an enlarged view of A in FIG. 4;

[0023] Figure 4 is Figure 2 is a cross-sectional view of the first volute of the primary centrifugal compression assembly or the second volute of the secondary centrifugal compression assembly in FIG. 4.

[0024] wherein, Figures 2-4 :

[0025] 1, primary centrifugal compression assembly; 11, primary volute; 111, exhaust hole; 12, primary flow inducer; 13, primary impeller;

[0026] 2, secondary centrifugal compression assembly; 21, secondary volute; 211, inlet hole; 22, secondary inducer; 23, secondary impeller;

[0027] 3, motor; 31, casing; 311, heat dissipation cavity; 3111, water inlet; 3112, water outlet; 312, air guide pipe; 313, air distribution cavity; 314, air collection cavity; 315, first partition plate; 316, second partition plate; 317, second water distribution plate; 318, first water distribution plate; 319, water jacket; 32, rotating shaft; 33, first end cover; 34, second end cover; 35, stator; 36, rotor; 37, magnetic suspension radial bearing; 38, magnetic suspension axial bearing. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0029] The cooling of the motor in the prior art is by setting a heat dissipation liquid tank, a liquid inlet and a liquid outlet in the motor, as shown in Figure 1 The liquid outlet and the liquid inlet are respectively connected with both ends of the heat dissipation liquid tank, the cold liquid enters the heat dissipation liquid tank from the liquid inlet, and then flows out from the liquid outlet, so as to cool the stator in the motor. The heat dissipation liquid tank is a multi-spiral groove, which can increase the contact area of the cold liquid, thereby improving the cooling effect on the stator in the motor. In order to prevent the secondary exhaust temperature from being too high, a water cooler is usually connected with the exhaust hole of the primary centrifugal compressor, and the water cooler is also connected with the air inlet hole of the secondary centrifugal compressor, so as to ensure that the secondary exhaust temperature is not too high. The above two cooling methods adopt two separate processes, which has a high cost.

[0030] Therefore, the present application provides a centrifugal compressor, which is different from the conventional compressor in that a heat dissipation cavity is arranged on the side wall of the casing of the present application, an air guide pipe is arranged in the heat dissipation cavity, the air guide pipe is connected with the exhaust hole of the primary centrifugal compression assembly and the air inlet hole of the secondary centrifugal compression assembly, and a water flow circuit is arranged in the heat dissipation cavity. The cooling water of the water flow circuit can cool the air guide pipe and the motor assembly at the same time. Thus, the defect that the stator of the motor and the exhaust of the primary centrifugal compressor are cooled separately in the prior art, resulting in a high cost, is overcome, and the cooling process is simplified.

[0031] The present application will be described in detail below with reference to the specific drawings. Figures 2-4 The technical solutions of the present application will be described in detail.

[0032] The centrifugal compressor provided by an embodiment of the present application is shown inFigure 2 and Figure 3 As shown, it includes a primary centrifugal compression assembly 1, a secondary centrifugal compression assembly 2, and a motor 3.

[0033] The motor 3 can be a magnetic levitation motor 3, an air levitation motor 3, or a high-speed motor 3 with a rolling sliding bearing structure. The present invention does not limit the type of motor 3.

[0034] See Figure 2 As shown, the motor 3 includes a housing 31 and a motor 3 assembly, which in turn includes a rotating shaft 32, a first end cover 33, a second end cover 34, a stator 35, a rotor 36, a magnetic levitation radial bearing 37, and a magnetic levitation axial bearing 38.

[0035] The rotating shaft 32 is a hollow structure. The first end cover 33 and the second end cover 34 are respectively connected to the two ends of the housing 31. The rotating shaft 32 is located inside the housing 31, and the two ends of the rotating shaft 32 are rotatably connected to the first end cover 33 and the second end cover 34 respectively.

[0036] The stator 35 and rotor 36 are also installed inside the housing 31. A positioning part is provided on the rotating shaft 32. The rotor 36 is sleeved on the positioning part and the rotor 36 is connected to the positioning part. The positioning part is used to restrict the rotor 36 from moving along the axial direction of the rotating shaft 32. The stator 35 is sleeved on the rotor 36 and the stator 35 is rotatably connected to the rotor 36. The stator 35 is connected to the inner wall of the housing 31.

[0037] The gap between the stator 35 and the housing 31 is filled with curing adhesive. The curing adhesive can be used to fill the gap between the stator 35 and the housing 31. The curing adhesive can improve the heat transfer coefficient between the stator 35 and the housing 31, thereby effectively controlling the temperature rise of the stator 35 during operation.

[0038] The magnetic levitation radial bearing 37 and the magnetic levitation axial bearing 38 are also installed in the housing 31. There are two magnetic levitation radial bearings 37. One magnetic levitation radial bearing 37 is connected to the first end cover 33, and the other magnetic levitation radial bearing 37 is connected to the second end cover 34. There are two magnetic levitation axial bearings 38. Both magnetic levitation axial bearings 38 are connected to the second end cover 34. The annular sleeve is located between the two magnetic levitation axial bearings 38.

[0039] See also Figure 2 As shown, the first-stage centrifugal compression assembly 1 is connected to the first end cap 33.

[0040] The primary centrifugal compression assembly 1 comprises a primary volute 11, a primary guide 12 and a primary impeller 13, the primary impeller 13 and the primary guide 12 are installed in the primary volute 11, and one end of the rotating shaft 32 extends to the primary impeller 13 of the primary centrifugal compression assembly 1 and is in transmission connection with the primary impeller 13 through a pull rod assembly, the primary impeller 13 rotates to form a negative pressure, air enters the primary volute 11 through the primary guide 12 to form primary compressed air.

[0041] Similarly, the secondary centrifugal compression assembly 2 is connected with the second end cover 34.

[0042] The secondary centrifugal compression assembly 2 comprises a secondary volute 21, a secondary guide 22 and a secondary impeller 23, the secondary impeller 23 and the secondary guide 22 are installed in the secondary volute 21, and the other end of the rotating shaft 32 extends to the secondary impeller 23 of the secondary centrifugal compression assembly 2 and is in transmission connection with the secondary impeller 23 through a pull rod assembly, the secondary impeller 23 rotates to form a low pressure area, the primary compressed air entering the secondary volute 21 of the secondary centrifugal compression assembly 2 is guided through the secondary guide 22 and then is discharged as secondary compressed air through the exhaust hole 111 of the secondary volute 21.

[0043] The volute of the primary centrifugal compression assembly 1 is fixed on the first end cover 33, the volute is provided with a primary exhaust passage, the primary compressed air enters the gas distribution chamber 313 through the first end cover 33 and the first casing 31, and then enters the gas collection chamber 314 after being cooled through the gas guide pipe 312; the second volute of the secondary centrifugal compression assembly 2 is fixed on the second end cover 34, the primary compressed air in the gas collection chamber 314 enters the second guide through the gas inlet passage of the casing 31 and the passage on the secondary volute 21, so as to enter the gas inlet hole 211 of the secondary centrifugal compressor and be discharged after being pressurized again.

[0044] The first volute and the second volute of the present application are different from the volute of the centrifugal machine in the prior art, the exhaust hole 111 of the volute in the prior art is radially arranged and flows to other components through a pipeline, while the present application is arranged with a plurality of exhaust holes 111 on the end face of the first volute, as shown in the drawings, which is directly connected with the hole of the casing 31, and a plurality of gas inlet holes 211 are arranged on the end face of the second volute, the first volute and the second volute have two layers, and the gas inlet passage is arranged between the two layers, so that the connecting pipeline is omitted. Figure 4

[0045] In order to simultaneously supply the stator 35 in the casing 31 and the primary centrifugal compression assembly 1 with the primary compressed air in the casing 31 for cooling, the side wall of the casing 31 of the present embodiment is provided with a heat dissipation chamber 311, as shown in the drawings, Figure 1 and Figure 2 ​As shown, the heat dissipation cavity 311 is provided with a gas guide pipe 312, which is connected with the exhaust hole 111 of the first volute of the first centrifugal compression assembly 1 and the air inlet hole 211 of the second volute of the second centrifugal compression assembly 2. The heat dissipation cavity 311 is provided with a water flow loop, and the cooling water of the water flow loop cools the gas guide pipe 312 and the stator 35 in the machine shell 31. The gas guide pipe 312 divides the heat dissipation cavity 311 into two cavities, and the inside of the gas guide pipe 312 is a gas cavity through which the first compressed air flows, and the outside of the gas guide pipe 312 is a water cavity through which the cooling water flows, so that the cooling water can cool the first compressed air in the gas guide pipe 312 and the stator 35 in the machine shell 31.

[0046] Specifically, the heat dissipation cavity 311 is provided with a gas distribution cavity 313 connected with the exhaust hole 111 of the volute of the first centrifugal compression assembly 1 and a gas collection cavity 314 connected with the air inlet hole 211 of the volute of the second centrifugal compression assembly 2. The heat dissipation cavity 311 and the gas distribution cavity 313 are provided with a first partition plate 315, and the heat dissipation cavity 311 and the gas collection cavity 314 are provided with a second partition plate 316.

[0047] The first partition plate 315 and the second partition plate 316 are provided with mounting holes, and the gas guide pipe 312 includes a plurality of pipes, the two ends of which are fixed on the first partition plate 315 and the second partition plate 316. Specifically, the two ends of the gas guide pipe 312 are inserted into the mounting holes, and the mounting holes of the first partition plate 315 and the second partition plate 316 are used to fix the gas guide pipe 312 in the heat dissipation cavity 311. The inner cavity of the gas guide pipe 312 is connected with the gas distribution cavity 313 and the gas collection cavity 314.

[0048] Continuing to refer to Figure 2 As shown, the heat dissipation cavity 311, the gas distribution cavity 313 and the gas collection cavity 314 of the embodiment are annular, and are arranged on the inner side of the machine shell 31 and outside the stator 35. The side wall of the heat dissipation cavity 311 is provided with a water inlet 3111 and a water return port 3112, and the water inlet 3111 and the water return port 3112 are spaced apart by a predetermined distance. The cooling water forms a water flow loop between the water inlet 3111 and the water return port 3112, and the cooling water is cooled in the process of flowing in the water flow loop.

[0049] In order to use the cooling water of the same water inlet 3111, but the gas guide pipe 312 and the stator 35 can be cooled respectively, the heat dissipation cavity 311 is provided with a water jacket 319 and two water distribution plates.

[0050] Referring to Figure 1 and Figure 2As shown, the water jacket 319 is annular and is sleeved on the outer wall of the stator 35, the two water distribution plates are a first water distribution plate 318 and a second water distribution plate 317, the first water distribution plate 318 and the second water distribution plate 317 are respectively arranged along the radial direction of the heat dissipation cavity 311 and are respectively installed at two ends of the water jacket 319, the surfaces of the first water distribution plate 318 and the second water distribution plate 317 are respectively provided with a plurality of fixing holes consistent with the number of the air guide pipes 312, the air guide pipes 312 pass through the fixing holes, and the water jacket 319, the first water distribution plate 318 and the second water distribution plate 317 combine to divide the heat dissipation cavity 311 into two independent cavities, the cooling water inside the water jacket 319 can cool the stator 35 of the motor 3, and the cooling water outside the water jacket 319 cools the primary compressed gas flowing through the air guide pipes 312.

[0051] Referring to Figure 3 As shown, the first water distribution plate 318 is close to the water inlet 3111 and divides the water flow of the water inlet 3111 into two paths, one of which is used to cool the air guide pipes 312 and the other of which is used to cool the components of the motor 3, and the second water distribution plate 317 is close to the water outlet 3112, and the two paths of water flow converge at the water outlet 3112.

[0052] The first water distribution plate 318 moves back and forth along the axial direction of the heat dissipation cavity 311 near the water inlet 3111, and the second water distribution plate 317 moves back and forth along the axial direction of the heat dissipation cavity 311 near the water outlet 3112, so that the amount of water entering the water jacket 319 from the inside and the outside can be controlled, and thus the cooling performance of the stator 35 and the primary compressed gas can be controlled.

[0053] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A centrifugal compressor comprising a primary centrifugal compression assembly, a secondary centrifugal compression assembly, and a motor, said primary and secondary centrifugal compression assemblies being disposed at opposite ends of said motor and connected to said motor, said motor comprising a housing and a motor assembly within said housing, characterized in that, The side wall of the shell is provided with a heat dissipation cavity, the heat dissipation cavity is provided with a gas guide pipe, the gas guide pipe is connected and communicated with the exhaust hole of the primary centrifugal compression assembly and the air inlet hole of the secondary centrifugal compression assembly, the heat dissipation cavity has a water flow circuit, and the cooling water of the water flow circuit cools the gas guide pipe and the motor assembly at the same time. The heat dissipation cavity is provided with a water jacket and a water distribution plate, and the water jacket and the water distribution plate combine to divide the heat dissipation cavity into two independent cavities. The water distribution plate includes a first water distribution plate and a second water distribution plate, the first water distribution plate and the second water distribution plate are respectively installed at two ends of the water jacket and are arranged along the radial direction of the heat dissipation cavity, the surfaces of the first water distribution plate and the second water distribution plate are respectively provided with a plurality of fixing holes consistent with the number of the gas guide pipes, and the gas guide pipes pass through the fixing holes. The side wall of the heat dissipation cavity is provided with a water inlet and a water return port, the first water distribution plate is close to the water inlet and divides the water flow of the water inlet into two paths, one path is used for cooling the gas guide pipe, and the other path is used for cooling the motor assembly, the second water distribution plate is close to the water return port, and the two paths of water flow converge at the water return port. The first water distribution plate moves forward and backward along the axial direction of the heat dissipation cavity near the water inlet, and the second water distribution plate moves forward and backward along the axial direction of the heat dissipation cavity near the water return port.

2. The centrifugal compressor of claim 1, wherein, The two sides of the heat dissipation cavity are respectively provided with a gas distribution cavity communicated with the exhaust hole of the primary centrifugal compression assembly and a gas collection cavity communicated with the air inlet hole of the secondary centrifugal compression assembly.

3. The centrifugal compressor of claim 2, wherein, The heat dissipation cavity and the gas distribution cavity are provided with a first partition plate, and the heat dissipation cavity and the gas collection cavity are provided with a second partition plate.

4. The centrifugal compressor of claim 3, wherein The gas guide pipes include a plurality of pipes, and the two ends of the pipes are respectively fixed on the first partition plate and the second partition plate, and the inner cavities of the gas guide pipes are simultaneously communicated with the gas distribution cavity and the gas collection cavity.

5. The centrifugal compressor according to any one of claims 1 to 4, characterized in that, The water inlet and the water return port are spaced apart by a predetermined distance.

6. The centrifugal compressor of claim 1, wherein, The water jacket is annular and is sleeved on the outer wall of the motor assembly.

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