CN215256869U

CN215256869U - Multistage vacuum pump structure is stretched to biax

Info

Publication number: CN215256869U
Application number: CN202121474181.3U
Authority: CN
Inventors: 李月仙
Original assignee: Zhenxin Turbine Machinery Co ltd
Current assignee: Zhenxin Turbine Machinery Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-12-21
Anticipated expiration: 2031-06-30

Abstract

A kind of double-shaft stretches the multistage vacuum pump structure, in the field of turbine machinery technology, including multistage vacuum pump, speed-increasing box, electrical machinery, steam turbine, characterized by that the multistage vacuum pump adopts the double-shaft to stretch the structure, its left shaft stretches and cooperates with electrical machinery transmission through the speed-increasing box, the right shaft stretches and cooperates with transmission connection between the steam turbine; this technical scheme novel in design, rational in infrastructure, based on with the biax stretch project organization, can make full use of the unnecessary steam of enterprise's steam power plant provide power for multistage vacuum pump, provide double-circuit power supply in order to realize one open one and prepare or can double-circuit drive for multistage vacuum pump, improve equipment use flexibility and energy comprehensive utilization efficiency, more economic energy-conserving.

Description

Multistage vacuum pump structure is stretched to biax

Technical Field

The utility model belongs to the technical field of turbo machinery, concretely relates to multistage vacuum pump structure is stretched to biax.

Background

In a papermaking vacuum system, a high-speed turbine vacuum pump has been widely applied due to the characteristics of water and electricity saving, complete solution of corrosion and scale deposition and the like, and particularly, the single-shaft multi-stage turbine vacuum pump can be used for pumping vacuum degrees of different grades on one machine, and has the advantages of large pumping capacity, high vacuum grade and the like. The utility model provides a shaft extension end that only designs of common multistage vacuum pump main shaft links with the gear box, and the gear box is by motor drive, and many large-scale papermaking enterprises still possess thermal power plant or other energy units simultaneously, and enterprise's self energy is abundant, and unnecessary steam or other energy all can supply for outside enterprise, consequently, the utility model provides a one division is equipped with the power assumption, and the abundant energy of make full use of enterprise provides double-circuit power supply for multistage vacuum pump.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at based on with the biax stretch structural design thinking, provide a biax and stretch multistage vacuum pump structure technical scheme to overcome the problem that exists among the prior art.

A double-shaft extension multistage vacuum pump structure comprises a multistage vacuum pump, a speed increasing box, a motor and a steam turbine and is characterized in that the multistage vacuum pump adopts a double-shaft extension structure, a left shaft of the multistage vacuum pump is in transmission fit with the motor through the speed increasing box, and a right shaft of the multistage vacuum pump is in transmission connection fit with the steam turbine.

The double-shaft extension multistage vacuum pump structure is characterized in that a left shaft is connected with a high-speed gear shaft in a speed increasing box through a left coupling in a transmission manner, a low-speed gear shaft in the speed increasing box is connected with a motor through a low-speed coupling in a transmission manner, and a right shaft is connected with a steam turbine through a right coupling in a transmission manner.

The double-shaft extension multistage vacuum pump structure is characterized in that a high-speed rotor of a pump of the multistage vacuum pump is of a multistage impeller single-shaft series structure, and a keyless connection structure is adopted between the pump shaft and each impeller.

The double-shaft-extension multistage vacuum pump structure is characterized in that dynamic pressure sliding bearings are respectively arranged at the joints of the multistage vacuum pump, the speed increasing box and the rotating shaft, an oil station is arranged at the bottom of the speed increasing box, and oil supply connection is established between the oil station and the dynamic pressure sliding bearings.

The double-shaft-extension multistage vacuum pump structure is characterized in that the motor and the steam turbine adopt the same rotation direction by taking each driving shaft head as a reference.

The double-shaft extension multistage vacuum pump structure is characterized in that a single or double-shaft key connection is adopted between the left coupling driven end and the left shaft extension of the left coupling and between the right coupling driven end and the right shaft extension of the right coupling respectively.

A biax stretch multistage vacuum pump structural design novelty, rational in infrastructure, based on with the biax stretch project organization, can make full use of enterprise's steam power plant unnecessary steam provide power for multistage vacuum pump, provide double-circuit power supply in order to realize one and open one and be equipped with or double-circuit drive for multistage vacuum pump, improve equipment use flexibility and energy comprehensive utilization efficiency, more economic energy-conserving.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of the multistage vacuum pump according to the present embodiment;

in the figure: 1-a multistage vacuum pump, 11-a pump high-speed rotor, 11 a-a pump shaft, 11 b-an impeller, 12-a left shaft extension, 13-a right shaft extension, 2-a left coupling, 21-a left coupling driven end, 3-a speed increasing box, 31-a low-speed gear shaft, 32-a high-speed gear shaft, 4-a low-speed coupling, 5-a motor, 6-a right coupling, 61-a right coupling driven end, 7-a steam turbine and 8-an oil station.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings:

as shown in the figure, the multistage vacuum pump structure is a double-shaft extension multistage vacuum pump structure, a pump high-speed rotor 11 of the multistage vacuum pump 1 is a multistage impeller single-shaft series structure, a non-key connection structure such as a hot sleeve interference installation is adopted between a pump shaft 11a and each impeller 11b, a left shaft extension 12 and a right shaft extension 13 are arranged at two ends of the pump shaft 11a to form the double-shaft extension structure of the multistage vacuum pump 1, wherein the left shaft extension 12 is in transmission connection with a high-speed gear shaft 32 in a speed increasing box 3 through a left coupler 2, a low-speed gear shaft 31 in the speed increasing box 3 is in transmission connection with a motor 5 through a low-speed coupler 4, and the left shaft extension 12 is in transmission fit with the motor 5 through the speed increasing box 3; the right shaft extension 13 is in transmission connection with the steam turbine 7 through the right coupling 6, so that the right shaft extension 13 is in transmission connection with the steam turbine 7; meanwhile, the motor 5 and the steam turbine 7 adopt the same rotating direction by taking the respective driving shaft heads as references, namely the rotating directions are the same when viewed from the respective driving shaft heads; dynamic pressure sliding bearings are respectively arranged at the joints of the multi-stage vacuum pump 1, the speed increasing box 3 and the rotating shaft, an oil station 8 is arranged at the bottom of the speed increasing box 3, and oil supply connection is established between the oil station 8 and the dynamic pressure sliding bearings.

In the above embodiment, the left coupling driven end 21 of the left coupling 2 and the left shaft extension 12, and the right coupling driven end 61 of the right coupling 6 and the right shaft extension 13 are connected by single or double keys.

In the above embodiment, the motor 5, the speed increasing box 3, the oil station 8, the multi-stage vacuum pump 1 and the steam turbine 7 which are sequentially arranged are arranged on the same plane, transmission is performed between the multi-stage vacuum pump 1 and the speed increasing box 3, between the motor 5 and the speed increasing box 3 and between the multi-stage vacuum pump 1 and the steam turbine 7 through the shaft coupling, the outer side of the shaft coupling is provided with the protective cover, and all the parts are compact in arrangement and convenient and reliable to disassemble and maintain.

In the above embodiment, the rotation directions of the motor 5 and the steam turbine 7 are the same when viewed from the respective driving shaft heads, so that the impellers 11b in the multistage vacuum pump 1 rotate only in the designed direction, and the performance parameter requirements required by users are met. When a user has power supply and steam at the same time, the steam turbine 7 is preferably started, and when only the steam turbine 7 is started, the power supply of the motor 5 can be cut off, the fastener of the driven end 21 of the left coupling is disconnected, the oil station normally works, and the multi-stage vacuum pump 1 operates; when only the motor 5 is started, the fastener of the driven end 61 of the right coupling is released, the oil station works normally, and the multi-stage vacuum pump 1 operates; when only a power supply is provided on the site of a user, the motor 5 is connected with the power supply, the speed is increased through the speed increasing box 3, the multistage vacuum pump 1 is driven to run at a high speed, vacuum extraction is realized, and a protective cover is arranged on the outer side of the right coupling driven end 61 of the multistage vacuum pump 1 when equipment leaves a factory; when a user only has steam, the steam turbine 7 drives the multistage vacuum pump 1 to run at a high speed, so that vacuum extraction is realized, and a protective cover is arranged on the outer side of the driven end 21 of the left coupling of the multistage vacuum pump 1 when equipment leaves a factory. In practical application, the three schemes are not limited, and suitable energy equipment can be matched according to the type of field energy to serve as power to drive the multistage vacuum pump 1, wherein the power equipment comprises a high-speed permanent magnet motor, a magnetic suspension motor and the like, the specific application process is the same as that of the steam turbine 7 with steam distribution, and the detailed description is omitted here.

In the above embodiment, a set of dynamic pressure sliding bearings is arranged between the bearing box of the multistage vacuum pump 1 and the pump high-speed rotor 11 to bear axial and radial loads of the rotor, two sets of dynamic pressure sliding bearings are respectively arranged between the speed increasing box 3 and the high-speed gear shaft 32 and between the speed increasing box and the low-speed gear shaft 31, the sliding bearings are lubricated by oil films, and have night shops with reliable bearing, small vibration and the like, and the lubricating oil is provided by the oil station 8. The oil station 8 is positioned at the bottom of the speed increasing box 3 and is designed in a container type with the speed increasing box 3, the space is compact, lubrication is provided for all sliding bearings, heat is taken away, and guarantee is provided for effective meshing of large gears and small gears in the speed increasing box 3.

In the above embodiment, the pump high-speed rotor 11 of the multistage vacuum pump 1 is designed as a multistage impeller single-shaft series structure, and the pump shaft 11a and each impeller 11b are designed to be in keyless connection and are installed by adopting shrink fit interference, etc., so that the impeller 11b and the pump shaft 11a are not loosened in a high-temperature state during high-speed operation, the fit is tight, the centering precision is high, and an overload protection effect is achieved; the two ends of the pump shaft 11a are respectively provided with a left shaft extension 12 and a right shaft extension 13 at the shaft extension ends to form a double-shaft extension structure of the multistage vacuum pump 1, the traditional motor driving concept is changed, multiple new energy sources are fully utilized to provide power for the multistage vacuum pump 1, and the applicability of the equipment is improved.

In the above embodiment, the left coupling 2, the right coupling 6 and the low-speed coupling 4 may be a diaphragm coupling, a laminated flexible coupling, a diaphragm coupling or the like according to the load condition; the left shaft extension 12 and the right shaft extension 13 at the extending ends of two shafts of the pump shaft 11a are both designed into cylindrical shaft heads, the left shaft extension 12 and the driven end 21 of the left coupling, and the right shaft extension 13 and the driven end 61 of the right coupling are both designed into flat key connections, and are in interference fit and shrink fit assembly, and the number of the key connections is one or two, so that the multistage vacuum pump 1 can be well adapted to the working conditions of large torque variation and strong impact load.

Claims

1. The utility model provides a multistage vacuum pump structure is stretched to biax, includes multistage vacuum pump (1), acceleration rate case (3), motor (5), steam turbine (7), and its characterized in that multistage vacuum pump (1) adopts the biax to stretch the structure, and its left axle is stretched (12) and is cooperated through acceleration rate case (3) and motor (5) transmission, and right axle is stretched (13) and is connected the cooperation with steam turbine (7) transmission between.

2. A double-shaft-extension multistage vacuum pump structure as claimed in claim 1, wherein the left shaft extension (12) is in transmission connection with a high-speed gear shaft (32) in the speed increasing box (3) through a left coupling (2), a low-speed gear shaft (31) in the speed increasing box (3) is in transmission connection with the motor (5) through a low-speed coupling (4), and the right shaft extension (13) is in transmission connection with the steam turbine (7) through a right coupling (6).

3. A double-shaft-extension multistage vacuum pump structure as defined in claim 1, wherein the pump high-speed rotor (11) of the multistage vacuum pump (1) is a multistage-impeller single-shaft series structure, and a keyless connection structure is adopted between the pump shaft (11 a) and each impeller (11 b).

4. A double-shaft multi-stage vacuum pump structure as defined in claim 1, wherein dynamic pressure sliding bearings are respectively disposed at the joints of the multi-stage vacuum pump (1), the speed-increasing box (3) and the rotating shaft, an oil station (8) is disposed at the bottom of the speed-increasing box (3), and an oil supply connection is established between the oil station (8) and the dynamic pressure sliding bearings.

5. A twin-shaft multi-stage vacuum pump structure as defined in claim 1, wherein said motor (5) and said steam turbine (7) use the same direction of rotation with respect to their respective drive shaft heads.

6. A twin-shaft multi-stage vacuum pump structure as defined in claim 2, wherein the left coupling driven end (21) of the left coupling (2) is connected with the left shaft extension (12), and the right coupling driven end (61) of the right coupling (6) is connected with the right shaft extension (13) by single or double keys.