CN216381893U

CN216381893U - Two-stage supercharging centrifugal compressor

Info

Publication number: CN216381893U
Application number: CN202123378544.6U
Authority: CN
Inventors: 张学锋; 冀伟星; 白江涛
Original assignee: Shigatuobo Clean Power Rugao Co ltd
Current assignee: Shigatuobo Clean Power Rugao Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-04-26
Anticipated expiration: 2031-12-30

Abstract

The utility model relates to the technical field of compressors, and particularly discloses a two-stage supercharging centrifugal compressor which comprises a first-stage volute, a first-stage impeller, a motor assembly, a second-stage impeller and a second-stage volute, wherein the motor assembly comprises a motor shell, a motor stator and a motor spindle which are sequentially arranged from outside to inside; two ends of the cooling liquid flow channel are respectively communicated with the cooling liquid inlet and the cooling liquid outlet. The middle pipeline arranged at the outlet of the first-stage volute is removed, so that the structure is simple, and the occupied space is small; and a gas channel is additionally arranged in the motor shell to cool a bearing on a motor main shaft, so that the service life of the compressor is prolonged.

Description

Two-stage supercharging centrifugal compressor

Technical Field

The utility model relates to the technical field of compressors, in particular to a two-stage supercharging centrifugal compressor.

Background

The existing two-stage supercharging centrifugal compressor generally adopts the structure that high-pressure gas after first-stage compression enters a second-stage volute through a pipeline arranged between the first-stage volute and the second-stage volute to be compressed for the second time, so that the output of the high-pressure gas is realized. The two-stage supercharging centrifugal compressor of the prior art has the following defects and shortcomings: the existence of the middle pipeline can cause the structure of the volute to be complex, the requirement on assembly precision is high, and the cost of related parts is high; and secondly, the sealing and fixing of the middle pipeline and the two volutes need to be considered structurally, so that the number of parts is large, and the structure is complex.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a two-stage supercharging centrifugal compressor, which is characterized in that gas compressed at one stage enters a two-stage volute after being cooled by a water cooling system arranged on a motor shell, so that the compression efficiency of the two stages is improved.

In order to solve the technical problem, the utility model provides a two-stage supercharging centrifugal compressor, which comprises a first-stage volute, a first-stage impeller, a motor component, a second-stage impeller and a second-stage volute, wherein the first-stage impeller and the second-stage impeller are respectively arranged at two sides of the motor component, the first-stage volute is covered at the outer side of the first-stage impeller and is fixed with the motor component, the second-stage volute is covered at the outer side of the second-stage impeller and is fixed with the motor component,

the motor assembly comprises a motor shell, a motor stator and a motor spindle which are sequentially arranged from outside to inside, a flow guide channel, a cold air channel and a cooling liquid channel are arranged in the shell wall of the motor shell, one end of the flow guide channel is communicated with the primary volute, the other end of the flow guide channel is communicated with the secondary volute, one end of the cold air channel is communicated with the flow guide channel, the other end of the cold air channel penetrates through the motor shell, and the cold air channel is used for allowing cold air to enter the motor spindle; and two ends of the cooling liquid flow channel are respectively communicated with the cooling liquid inlet and the cooling liquid outlet.

Further, a bearing seat is arranged between one end of the motor shell and the motor spindle, an air bearing is arranged between the bearing seat and the motor spindle, an air bearing is also arranged between the other end of the motor shell and the motor spindle, and a secondary back plate is arranged at the end of the air bearing.

Further, the outer side of the bearing seat is provided with a thrust assembly, the outer side of the thrust assembly is provided with a primary back plate, and the primary impeller is arranged on the outer side of the primary back plate.

Furthermore, the thrust subassembly includes thrust dish and footstep bearing, the quantity of footstep bearing is two, overlaps respectively to be established the both sides of thrust dish.

Furthermore, a labyrinth seal structure is arranged between the secondary back plate and the motor spindle.

Furthermore, a cold air exhaust port for discharging cold air is further arranged on the motor shell.

Preferably, the cooling liquid channel is a spiral cooling liquid channel.

The utility model has the beneficial effects that:

1) according to the utility model, the intermediate pipeline arranged at the outlet of the primary volute is removed, so that the number of related parts is reduced, the structure is simple, and the occupied space is small.

2) According to the utility model, the gas after primary compression is further cooled by the water cooling system arranged on the motor shell and then enters the secondary volute, so that the secondary compression efficiency can be increased.

3) The utility model adds the gas channel in the motor shell, so that the gas channel on the outer layer of the shell enters the front end of the radial bearing of the motor main shaft through the channel arranged on the motor shell, and then the bearing on the motor main shaft is cooled, thereby prolonging the service life of the compressor.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a structural sectional view of a centrifugal compressor according to the present invention;

in the figure: 1-a first-stage volute, 2-a first-stage impeller, 3-a bearing seat, 4-an air bearing, 5-a thrust disc, 6-a first-stage back plate, 7-a motor shell, 8-a motor stator, 9-a motor spindle, 10-a second-stage impeller, 11-a second-stage volute, 12-a second-stage back plate, 13-a labyrinth sealing structure, 71-a flow guide channel, 72-a cold air channel, 73-a cooling liquid channel, 74-a cooling liquid inlet, 75-a cooling liquid outlet and 76-a cold air exhaust port.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the specification of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In an embodiment of the present invention, as shown in fig. 1, a two-stage supercharging centrifugal compressor includes a first-stage volute 1, a first-stage impeller 2, a motor assembly, a second-stage impeller 10, and a second-stage volute 11, wherein the first-stage impeller 2 and the second-stage impeller 10 are respectively disposed on two sides of the motor assembly, the first-stage volute 1 covers the outer side of the first-stage impeller 2 and is fixed to the motor assembly, the second-stage volute 11 covers the outer side of the second-stage impeller 10 and is fixed to the motor assembly, the motor assembly includes a motor housing 7, a motor stator 8, and a motor spindle 9 that are sequentially disposed from outside to inside, a flow guiding channel 71, a cold air channel 72, and a coolant flow channel 73 are disposed in a housing wall of the motor housing 7, one end of the flow guiding channel 71 is communicated with the first-stage volute 1, the other end is communicated with the second-stage volute 11, one end of the cold air channel 72 is communicated with the flow guiding channel 71, the other end penetrates through the motor shell 7, the cold air channel 72 is used for cold air to enter the motor spindle 9, and a cold air exhaust port 76 for cold air exhaust is further arranged on the motor shell 7. Two ends of the cooling liquid channel 73 are respectively communicated with a cooling liquid inlet 74 and a cooling liquid outlet 75, and the cooling liquid channel 73 is a spiral cooling liquid channel.

A bearing seat 3 is arranged between one end of the motor shell 7 and the motor spindle 9, an air bearing 4 is arranged between the bearing seat 3 and the motor spindle 9, the air bearing 4 is also arranged between the other end of the motor shell 7 and the motor spindle 9, a secondary back plate 12 is arranged at the end of the air bearing, and a labyrinth seal structure 13 is arranged between the secondary back plate 12 and the motor spindle 9. The outer side of the bearing seat 3 is provided with a thrust assembly 5, the outer side of the thrust assembly 5 is provided with a first-stage back plate 6, the first-stage impeller 2 is arranged on the outer side of the first-stage back plate 6, preferably, the thrust assembly 5 comprises two thrust discs and two thrust bearings, and the two thrust bearings are respectively sleeved on two sides of each thrust disc.

The working process of the two-stage centrifugal compressor comprises the following steps: the inlet of the first-stage volute 1 is connected with an air inlet pipeline, the outlet of the second-stage volute 11 is connected with a high-pressure air outlet pipeline, the cold air exhaust port 76 is connected with a cold air exhaust pipeline, and the cooling liquid inlet 74 and the cooling liquid outlet 75 are respectively connected with an inlet and outlet pipeline of a cooling system.

The first-stage volute 1 and the first-stage impeller 2 form a matching relation, work is performed and pressure is increased through the first-stage impeller 2, then pressure is increased through a diffuser formed by the first-stage volute 1 and a first-stage back plate 6, the pressure enters a flow guide channel 71 of a motor shell 7 through a flow channel, then the pressure enters an inlet of the second-stage impeller 10 through an outer layer channel of the second-stage volute 11, the pressure is continuously increased through the work and pressure increase of the second-stage impeller, the pressure enters the second-stage back plate and the diffuser of the second-stage volute, the pressure is discharged out of the second-stage volute 11 through an exhaust chamber, and the pressure enters a high-pressure gas outlet pipeline.

The coolant enters the spiral cooling channel 73 of the motor housing 7 through the coolant inlet 74, takes away heat generated by the motor, ensures that the motor works at a safe working temperature, and simultaneously cools the primary pressurized air flowing through the flow guide channel 71 of the motor housing 7 and finally flows out through the coolant outlet 75.

The air bearing 4 is cooled by the air introduced through the air passage 72, and the cooled high-pressure air is discharged to a cold air discharge pipeline through a cold air discharge port 76 installed on the motor housing 9.

The above disclosure is only one preferred embodiment of the present invention, and certainly should not be construed as limiting the scope of the utility model, which is defined by the claims and their equivalents.

Claims

1. The utility model provides a two-stage supercharging centrifugal compressor, includes one-level spiral case (1), one-level impeller (2), motor element, second grade impeller (10) and second grade spiral case (11), one-level impeller (2) and second grade impeller (10) set up respectively motor element's both sides, one-level spiral case (1) cover is established the outside of one-level impeller (2) and with motor element is fixed, second grade spiral case (11) cover is established the outside of second grade impeller (10) and with motor element is fixed, its characterized in that:

the motor assembly comprises a motor shell (7), a motor stator (8) and a motor spindle (9) which are sequentially arranged from outside to inside, a flow guide channel (71), a cold air channel (72) and a cooling liquid channel (73) are arranged in the shell wall of the motor shell (7), one end of the flow guide channel (71) is communicated with the primary volute (1), the other end of the flow guide channel is communicated with the secondary volute (11), one end of the cold air channel (72) is communicated with the flow guide channel (71), and the other end of the cold air channel penetrates through the motor shell (7); and two ends of the cooling liquid flow channel (73) are respectively communicated with a cooling liquid inlet (74) and a cooling liquid outlet (75).

2. A two-stage booster centrifugal compressor according to claim 1, characterized in that a bearing seat (3) is provided between one end of the motor housing (7) and the motor spindle (9), an air bearing (4) is provided between the bearing seat (3) and the motor spindle (9), an air bearing (4) is also provided between the other end of the motor housing (7) and the motor spindle (9), and a secondary back plate (12) is mounted at the end.

3. A two-stage centrifugal booster compressor according to claim 2, characterised in that the bearing block (3) is provided on its outside with a thrust assembly (5), the thrust assembly (5) is provided on its outside with a one-stage back plate (6), and the one-stage impeller (2) is provided on the outside of the one-stage back plate (6).

4. A two-stage centrifugal booster compressor according to claim 3, characterised in that the thrust assembly (5) comprises two thrust disks and two thrust bearings, which are respectively fitted on both sides of the thrust disks.

5. A two-stage booster centrifugal compressor according to claim 2, characterized in that a labyrinth seal (13) is provided between the secondary backplate (12) and the motor shaft (9).

6. A two-stage booster centrifugal compressor according to claim 1, characterised in that the motor housing (7) is further provided with a cold air discharge opening (76) for discharging cold air.

7. A two-stage booster centrifugal compressor according to claim 1, characterised in that the coolant flow channel (73) is a spiral coolant flow channel.