CN111120364A

CN111120364A - High-speed centrifugal compressor

Info

Publication number: CN111120364A
Application number: CN201911372021.5A
Authority: CN
Inventors: 方志翔; 张勇; 杜海英; 葛玉柱; 聂湘华
Original assignee: Hunan Fine High Intelligent Equipment Co ltd
Current assignee: Hunan Fine High Intelligent Equipment Co ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-05-08

Abstract

The invention relates to a high-speed centrifugal compressor, which comprises a whole machine base (1), a cabinet body (5), a heat dissipation assembly (12), a motor (11), a lubricating assembly (13), a high-speed gear box (3), a volute assembly (4) and an air outlet pipeline (8), wherein the cabinet body (5) is arranged on the whole machine base (1), the heat dissipation assembly (12), the motor (11), the lubricating assembly (13), the high-speed gear box (3), the volute assembly (4) and the air outlet pipeline (8) are arranged in the cabinet body (5), the output end of the motor (11) is connected with the input end of the high-speed gear box (3) through a coupler (10), the output end of the high-speed gear box (3) is connected with an impeller (40) in the volute assembly (4), the heat dissipation assembly (12) and the lubricating assembly (13) are further arranged on the whole machine base (, Low noise and high power density.

Description

High-speed centrifugal compressor

Technical Field

The invention relates to the field of compressors, in particular to a high-speed centrifugal compressor.

Background

The compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas, and is the heart of a refrigeration system. The refrigerating cycle is powered by sucking low-temperature and low-pressure refrigerant gas from the air suction pipe, driving the piston to compress the refrigerant gas through the operation of the motor, and discharging high-temperature and high-pressure refrigerant gas to the exhaust pipe.

The compressors are mainly classified into a positive displacement type including a screw compressor, a piston compressor, and the like, and a dynamic type including an axial flow compressor, a centrifugal compressor, and a mixed flow compressor. The main components of centrifugal compressors used to compress gases are high speed rotating impellers and diffusers of increasing flow area. In short, the centrifugal compressor works on gas through an impeller, and mechanical energy is converted into pressure energy of the gas by utilizing centrifugal boosting action and speed reduction and diffusion action in a flow passage of the impeller and a diffuser. When gas flows through the impeller of the centrifugal compressor, the impeller which runs at high speed enables the gas to be under the action of centrifugal force, on one hand, the pressure is improved, and on the other hand, the speed is greatly increased, namely, the centrifugal compressor firstly converts the mechanical energy of a prime motor into the static pressure energy and the kinetic energy of the gas through the impeller. Then, when the gas flows through the passage of the diffuser, the section of the flow passage is gradually increased, the flow velocity of the front gas molecules is reduced, and the rear gas molecules continuously flow forwards, so that most kinetic energy of the gas is converted into static pressure energy, namely, the function of boosting is further achieved. The work of the impeller on the gas is the root cause of the increased pressure of the gas, and the work of the impeller on the unit mass of the gas in unit time is closely related to the peripheral speed of the outer edge of the impeller, and the larger the peripheral speed, the larger the work of the impeller on the gas.

In the early days, the compressor was not noticed because it was only suitable for low, medium pressure, large flow applications. Due to the development of chemical industry, the establishment of various large-scale plants and oil refineries, the centrifugal compressor is a key machine for compressing and conveying various gases in chemical production and plays an extremely important role. Centrifugation with the achievement of aerodynamic studiesThe efficiency of the compressor is continuously improved, and due to the successful development of technical keys such as high-pressure sealing, processing of a small-flow narrow impeller, a multi-oil-wedge bearing and the like, a series of problems of the centrifugal compressor developing towards a high-pressure and wide-flow range are solved, so that the application range of the centrifugal compressor is greatly expanded, the reciprocating compressor can be replaced in many occasions, and the application range is greatly expanded. The pressure of the industrial high-pressure centrifugal compressor is (150-350) multiplied by 10^5Pa, and the pressure of the centrifugal compressor for gas injection of the offshore oilfield is up to 700 multiplied by 10^5 Pa. The flow rate of a centrifugal blower used for blast furnace blowing is as large as 7000m³The power is 52900KW, and the rotating speed is generally more than 10000 r/min. Existing centrifugal compressors fall into two categories: the single-stage high-speed centrifugal type and the multi-stage centrifugal type are mainly distinguished by the number and the arrangement mode of impellers.

The single-stage high-speed centrifugal compressor occupies a larger market share, a motor is adopted to drive a gear speed increasing box, the rotating speed of an impeller is increased to 10000-25000 r/min through primary transmission of a gear, and the overall efficiency is improved compared with the multi-stage centrifugal compressor. However, due to the limitation of the working rotating speed of the impeller, the advantages of the impeller cannot be fully shown, and performance parameters such as the operating efficiency and the power density have a large improvement space.

The multistage centrifugal compressor has the disadvantages of complex structural form, large overall size, low overall working efficiency and large energy loss under the condition that the equipment works for a long time.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a high-speed centrifugal compressor, which aims to solve the technical problems of complex overall structure, high noise, low power density and the like in the operation of the conventional centrifugal fan.

The technical scheme adopted by the invention for solving the technical problems is as follows: the high-speed centrifugal compressor comprises a whole machine base 1, a cabinet body 5, a heat dissipation assembly 12, a motor 11, a lubricating assembly 13, a high-speed gear box 3, a volute assembly 4 and an air outlet pipeline 8, wherein the cabinet body 5 is arranged on the whole machine base 1, the heat dissipation assembly 12 is installed in the cabinet body 5, the motor 11, the lubricating assembly 13, the high-speed gear box 3, the volute assembly 4 and the air outlet pipeline 8, the output end of the motor 11 is connected with the input end of the high-speed gear box 3 through a coupler 10, the output end of the high-speed gear box 3 is connected with an impeller 40 in the volute assembly 4, and the high-speed gear box 3.

The gas outlet of the volute component 4 is connected with the gas outlet pipeline 8, and the gas inlet silencing plate 6 mounted on the cabinet body 5 is arranged near the gas inlet of the volute component 4. An oil tank 2 is also arranged in the cabinet body 5, the high-speed gear box 3 is fixed on the oil tank 2, and the oil tank 2 and the motor 11 are fixedly arranged on the base 1 of the whole machine; the power output shaft of the motor 11 is connected to the low speed shaft 31 of the high speed gear box 3 through the coupling 10, and the impeller 40 is fixedly mounted on the high speed shaft 35 of the high speed gear box 3. The lubricating assembly 13 comprises an electric pump 14 which is used for protecting a sliding bearing during starting and stopping, the heat dissipation assembly 12 is used for dissipating heat of lubricating oil, and the lubricating assembly 13 is used for oil circuit distribution and overflow protection.

Preferably, the cabinet body 5 is coated with a sound attenuation material, so that the noise of the whole machine can be greatly improved.

Preferably, the high-speed gearbox 3 is also provided with an air permeable cap 9 which is communicated with the inside of the high-speed gearbox 3 to ensure the pressure inside the gearbox is balanced.

Preferably, a diffuser 39 is also provided in the volute assembly 4;

the high-speed gear box 3 is driven by two-stage parallel shafts and comprises a low-speed shaft 31, a low-speed gearwheel 32, an intermediate shaft 33, an intermediate shaft gearwheel 34 and a high-speed shaft 35, wherein the low-speed shaft 31 is supported by 2

cylindrical roller bearings

314 and 1 four-point contact ball bearing 313; the intermediate shaft is supported by 1 cylindrical roller bearing 311 and 1 self-aligning roller bearing 312; the high-speed shaft is supported by 1 radial sliding bearing 351 and 1 thrust radial composite bearing 352, the box structure of the high-speed gearbox is of a left-right opposite clamping type and consists of a box rear baffle 36, a middle box 37 and a box front baffle 38, and a mechanical pump 41 is fixedly arranged on the low-speed shaft 31 and provides lubricating oil with certain pressure for gears and bearings of the gearbox.

The high-speed gear box 3 is also provided with a sealing structure which is divided into an air sealing part and an oil sealing part, the oil sealing structure comprises an oil slinger 353, an oil baffle plate 354, a labyrinth seal end cover 355 and a wind shield 356, the oil baffle plate 354 can prevent most of lubricating oil from entering the labyrinth seal structure, and a small amount of entering lubricating oil flows back to the oil tank from an oil return hole 359 after passing through a plurality of labyrinths. The wind guard 356 is used to balance the air pressure and prevent the negative pressure generated by the high speed rotation of the impeller seal ring 357 from drawing out the lubricating oil. The air sealing structure comprises an impeller sealing ring 357 and an air sealing piece 358, wherein the air sealing piece 358 is not only provided with a plurality of sealing teeth in the axial direction, but also matched with the impeller sealing ring 357 to block most of high-pressure gas, and only a small amount of low-pressure gas is left after the residual gas passes through a plurality of sealing teeth of the air sealing piece 357. The gas enters the high-speed gear box 3, so that the air tightness is further improved, and the pneumatic performance of the whole machine is improved.

The invention has the beneficial effects that: the centrifugal fan has simple integral structure, low noise and high power density during operation.

Drawings

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

Fig. 1 is a schematic view of a high-speed centrifugal compressor.

FIG. 2 is a schematic sectional view of a high-speed gearbox.

Fig. 3 is a schematic view of a sealing structure.

1-a whole machine base; 2-an oil tank; 3-a high-speed gearbox; 4-a volute assembly; 5-case body outer cover; 6-air intake silencing plate; 7-an emptying valve; 8-an air outlet pipeline; 9-a breathable cap; 10-a coupler; 11-a motor; 12-a heat dissipating component; 13-a lubricating assembly; 14-an electric pump; 31-low speed shaft; 312-cylindrical roller bearings; 313-four point contact ball bearing; 314-cylindrical roller bearings; 32-low speed gear wheel; 311-self-aligning roller bearing; 33-intermediate shaft; 34-countershaft bull gear; 35-high speed shaft; 351-radial slide bearing; 352-thrust radial compound bearing; 353, an oil slinger; 354-oil baffle; 355-labyrinth seal end caps; 356-wind deflector; 357-impeller seal ring; 358-air tight seal; 359-oil return holes 36-tank tailgate; 37-a middle box body; 38-front baffle of the box body; 39-a diffuser; 40-an impeller; 41-mechanical pump.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is also to be noted that the terms "disposed," "mounted," "connected," and the like are to be construed broadly unless otherwise specifically stated or limited. For example, the connection can be fixed, detachable or integrated; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the high-speed centrifugal compressor includes a whole machine base 1, a cabinet 5, a heat dissipation assembly 12, a motor 11, a lubrication assembly 13, a high-speed gear box 3, a volute assembly 4, and an air outlet pipeline 8, wherein the cabinet 5 is disposed on the whole machine base 1, the heat dissipation assembly 12, the motor 11, the lubrication assembly 13, the high-speed gear box 3, the volute assembly 4, and the air outlet pipeline 8 are mounted in the cabinet 5, an output end of the motor 11 is connected with an input end of the high-speed gear box 3 through a coupling 10, an output end of the high-speed gear box 3 is connected with an impeller 40 in the volute assembly 4, and the high-speed gear box 3.

The inside cladding of the cabinet body 5 has noise reducing material, can improve the complete machine noise greatly, and in addition, the gas outlet and the pipeline 8 of giving vent to anger of spiral case subassembly 4 are connected, and near the gas inlet of spiral case subassembly 4 is equipped with the acoustical panel 6 that admits air of installing on the cabinet body 5.

An oil tank 2 is also arranged in the cabinet body 5, the high-speed gear box 3 is fixed on the oil tank 2, and the oil tank 2 and the motor 11 are fixedly arranged on the base 1 of the whole machine;

the high-speed gear box 3 is also provided with a ventilation cap 9 which is communicated with the inside of the high-speed gear box 3 to ensure the pressure balance inside the gear box;

a diffuser 39 is also arranged in the volute component 4;

the power output shaft of the motor 11 is connected to the low speed shaft 31 of the high speed gear box 3 through the coupling 10, and the impeller 40 is fixedly mounted on the high speed shaft 35 of the high speed gear box 3.

The lubricating assembly 13 comprises an electric pump 14 which is used for protecting a sliding bearing during starting and stopping, the heat dissipation assembly 12 is used for dissipating heat of lubricating oil, and the lubricating assembly 13 is used for oil circuit distribution and overflow protection.

Referring to fig. 2, the high-speed gearbox 3 is a two-stage parallel shaft transmission, and comprises a low-speed shaft 31, a low-speed gearwheel 32, an intermediate shaft 33, an intermediate shaft gearwheel 34 and a high-speed shaft 35, wherein the low-speed shaft 31 is supported by 2

cylindrical roller bearings

The high-speed gear box 3 is further provided with a sealing structure which is divided into an air sealing part and an oil sealing part, wherein the oil sealing part is used for preventing lubricating oil inside the gear box from leaking out, and the air sealing part is used for preventing high-pressure gas generated by the impeller 40 from entering the gear box.

Referring to fig. 3, the oil sealing structure includes an oil slinger 353, an oil baffle plate 354, a labyrinth seal end cover 355, and a wind baffle 356, where the oil baffle plate 354 can prevent most of the lubricating oil from entering the labyrinth seal structure, and a small amount of the entering lubricating oil passes through a plurality of labyrinths and then flows back to the oil tank from an oil return hole 359. The wind guard 356 is used to balance the air pressure and prevent the negative pressure generated by the high speed rotation of the impeller seal ring 357 from drawing out the lubricating oil. The air sealing structure comprises an impeller sealing ring 357 and an air sealing piece 358, wherein the air sealing piece 358 is not only provided with a plurality of sealing teeth in the axial direction, but also matched with the impeller sealing ring 357 to block most of high-pressure gas, and only a small amount of low-pressure gas is left after the residual gas passes through a plurality of sealing teeth of the air sealing piece 357. The gas enters the high-speed gear box 3, so that the air tightness is further improved, and the pneumatic performance of the whole machine is improved.

The high-speed centrifugal compressor works as follows:

the motor 11 drives the low-speed shaft 31 of the high-speed gear box 3 to rotate through the coupler 10, the power is transmitted to the high-speed shaft 35 through the low-speed shaft 31 after the speed is increased through the high-speed gear box 3, the high-speed shaft 35 is connected with the impeller 40, the impeller 40 rotates at a high speed, external air enters the volute component 4 from the outside through the air inlet silencing plate 6 and is sucked in under the driving of the impeller 40, the external air is changed into high-pressure air under the stirring of the impeller, and the output high-pressure air is diffused through the diffuser 39 and then is output to the outside through the air outlet pipeline 8.

Claims

1. The utility model provides a high-speed centrifugal compressor, includes complete machine base (1), the cabinet body (5), radiator unit (12), motor (11), lubricated subassembly (13), high-speed gear box (3), spiral case subassembly (4), pipeline (8) of giving vent to anger, wherein is equipped with cabinet body (5), its characterized in that on complete machine base (1): the improved multifunctional cabinet is characterized in that a heat dissipation assembly (12), a motor (11), a lubricating assembly (13), a high-speed gear box (3), a volute assembly (4) and an air outlet pipeline (8) are installed in the cabinet body (5), the output end of the motor (11) is connected with the input end of the high-speed gear box (3) through a coupler (10), the output end of the high-speed gear box (3) is connected with an impeller (40) in the volute assembly (4), and the heat dissipation assembly (12) and the lubricating assembly (13) are further arranged on the whole machine base (1).

2. A high speed centrifugal compressor as claimed in claim 1 wherein: the high-speed gearbox (3) is driven by two stages of parallel shafts and comprises a low-speed shaft (31), a low-speed gearwheel (32), an intermediate shaft (33), an intermediate shaft gearwheel (34) and a high-speed shaft (35), wherein the low-speed shaft (31) is supported by 2 cylindrical roller bearings (314) and 1 four-point contact ball bearing (313); the intermediate shaft is supported by 1 cylindrical roller bearing (311) and 1 self-aligning roller bearing (312); the high-speed shaft is supported by 1 radial sliding bearing (351) and 1 thrust radial composite bearing (352), the box body structure of the high-speed gear box is of a left-right opposite clamping type and consists of a box body rear baffle (36), a middle box body (37) and a box body front baffle (38), and a mechanical pump (41) is fixedly arranged on the low-speed shaft (31); the air outlet pipeline is provided with the emptying valve 7, the emptying valve is opened in the starting and stopping processes of the unit, the unit surging caused by pipeline blockage is prevented, and meanwhile, the emptying valve can be automatically opened in an emergency state, so that the unit is prevented from being impacted too much by gas.

3. A high speed centrifugal compressor as claimed in claim 1 wherein: high-speed gear box (3) still be equipped with seal structure, it is divided into and seals gas and oil two parts, seal oil including oil slinger (353), oil baffle (354), labyrinth end cover (355), deep bead (356), oil baffle (354) can prevent most lubricating oil to get into labyrinth seal structure, the lubricating oil of a small amount of entering is after multichannel maze, all flows back to the oil tank from oil gallery (359), deep bead (356) are used for balanced atmospheric pressure, prevent that impeller sealing ring (357) high-speed rotatory negative pressure that produces from drawing lubricating oil, seal gas including impeller sealing ring (357) and air seal (358), air seal (358) have increased sealed tooth in the axial, cooperate with impeller sealing ring (357).

4. Compressor according to claim 1, characterized in that the cabinet (5) is internally coated with a sound dampening material.

5. A compressor according to claim 3, wherein the gas outlet of the volute assembly (4) is connected to the gas outlet pipe (8), and a gas inlet muffling plate (6) mounted on the cabinet (5) is provided near the gas inlet of the volute assembly (4).

6. The compressor according to claim 1, wherein an oil tank (2) is further arranged in the cabinet body (5), the high-speed gear box (3) is fixed on the oil tank (2), and the oil tank (2) and the motor (11) are fixedly arranged on the whole machine base (1).

7. Compressor according to claim 1, characterized in that the high-speed gearbox (3) is also provided with a ventilation cap (9) which communicates with the interior of the high-speed gearbox (3).

8. The compressor of claim 1, wherein a diffuser (39) is further provided within the volute assembly (4).

9. Compressor according to claim 1, characterized in that the lubricating package (13) comprises an electric pump (14) for protecting the slide bearings during start-up and shut-down.

10. Compressor according to claim 2, characterized in that the heat dissipating assembly (12) is used for dissipating heat from the lubricating oil, and the lubricating assembly (13) is used for oil circuit distribution and overflow protection.