CN212106336U

CN212106336U - Four-stage turbine fan for papermaking

Info

Publication number: CN212106336U
Application number: CN202020521948.2U
Authority: CN
Inventors: 陈刚
Original assignee: Hangzhou Sixin Industrial Pump Manufacturing Co ltd
Current assignee: Hangzhou Sixin Industrial Pump Manufacturing Co ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2020-12-08
Anticipated expiration: 2030-04-10

Abstract

A four-stage turbofan for papermaking comprising: the fan case is used for installing an impeller and a volute of the four-stage fan; the driving bevel gear shaft is arranged in the fan case and is hinged with the fan case; two driven bevel gear shafts are arranged in the fan case, are meshed with the driving bevel gear shaft and are hinged with the fan case; the four impellers are arranged on the driven bevel gear shaft, driven by the driven bevel gear shaft to rotate and fixedly connected with the driven bevel gear shaft; the four spiral cases are sleeved outside the impeller, the side face of each spiral case is provided with a shaft hole, and each spiral case is fixedly connected with the fan case. The beneficial effects of the utility model reside in that: the negative pressure requirements of four devices can be provided at the same time; can four turbo fan linkages provide bigger negative pressure, can separately overhaul when the clapping appears in any one of four interlocked turbo fan, reduce the maintenance flow and provide.

Description

Four-stage turbine fan for papermaking

Technical Field

The utility model relates to a centrifugal fan, concretely relates to level four turbofan for papermaking.

Background

Modern paper machines utilize vacuum to assist in dewatering the paper sheet, and thus the vacuum system is an important component of a paper machine. A plurality of vacuum elements with different vacuum degree requirements on a paper machine are required to be connected to a vacuum system. The vacuum system is constructed by selecting the turbo fans, and only one or two or three turbo fans are needed, so that the vacuum system of a large paper machine can be constructed.

The working principle of the turbine fan is that the interaction between the blades and gas is utilized, the impeller rotates at high speed, the gas pressure and the kinetic energy are improved, and the airflow is decelerated by utilizing the sequential through-flow elements, so that the kinetic energy is converted into the pressure improvement. Multiple stages of combined compression are typically used to achieve the final desired pressure. When used as a vacuum generator, the final pressure of the discharge is atmospheric pressure, and the suction pressure is negative. In general, in a paper mill, a multi-stage centrifugal turbine fan is used more frequently, the pressure is increased step by step, each stage is provided with a suction inlet, and each suction inlet has different vacuum degrees. If a single stage turbine fan is used, it can only operate in a single, small vacuum range.

The invention discloses a parallel centrifugal fan which is invented and created by China published patent No. CN108843603A on 2018, 11 and 20, and relates to a fan which comprises a base part and an impeller part. When the centrifugal fan operates, in the process that the motor drives the impeller of the impeller component to rotate, the impeller stirs a part of air flow in the air inlet inner cavity to flow into the inner cavity of the confluence volute, the flow of the air flow entering the inner cavity of the impeller is increased, the large-flow air flow is decelerated and pressurized in the inner cavity of the centrifugal volute, and the whole output air flow pressure of the centrifugal fan is improved. In the process that the airflow enters the inner cavity of the impeller from the inner cavity of the confluence volute, the impeller blades exert force on the airflow, and the airflow flows to the impeller centrifugal section from the impeller confluence section with lower energy loss. The structural characteristics of the inner cavity of the confluence volute increase the sectional area of the air flow entering the inner cavity of the impeller, and the axial length of a confluence section of the impeller is shortened, so that the centrifugal fan is compact in structure. The centrifugal fan has the advantages of unlimited axial length, large output airflow pressure and high efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a machine case to current multistage fan often packs impeller or turbine into quick-witted incasement portion, and the phenomenon of stall or surge appears in the fan, and when the flow of ventilating of local vacuum component actual operation was bigger than normal, multistage turbine fan can also be because associative between at different levels, can appear the phenomenon that the complete machine vacuum is lower than normal, still can cause the sharp decline of turbine fan performance when serious, "jam" operating mode appears, and provide a level four turbine fan for papermaking.

A four-stage turbofan for papermaking comprising:

the fan case is used for installing an impeller and a volute of the four-stage fan;

the driving bevel gear shaft is arranged in the fan case and is hinged with the fan case;

two driven bevel gear shafts are arranged in the fan case, are meshed with the driving bevel gear shaft and are hinged with the fan case;

the four impellers are arranged on the driven bevel gear shaft, driven by the driven bevel gear shaft to rotate and fixedly connected with the driven bevel gear shaft;

the four spiral cases are sleeved outside the impeller, the side face of each spiral case is provided with a shaft hole, and each spiral case is fixedly connected with the fan case.

The four volutes and the impeller are assembled into four turbo fans which are driven by the same fan case. Four turbo fans can use respectively, and single turbo fan spiral case shaft hole intercommunication needs the structure that provides the negative pressure, can carry out the negative pressure output to four structures simultaneously. When a structure needs to be larger than the negative pressure which can be provided by a single turbine fan, the worm port of the first turbine fan can be connected to the shaft hole of the second turbine fan, and the larger negative pressure output is improved through the communication of the turbine fans. At most four turbo fans can be connected in sequence.

Preferably, the blower housing includes:

the gear cavity is arranged in the fan case, is symmetrical about a central axis plane of the short side of the fan case and a central axis plane of the long side of the fan case, and is used for arranging a driving bevel gear shaft and a driven bevel gear shaft;

the two driving bevel gear bearings are arranged on the central axis of the long edge of the gear cavity, are used for reducing the rotation loss of the driving bevel gear shaft, are matched with the driving bevel gear shaft to work and are not communicated with the gear cavity;

the speed measuring gear cavity is arranged on the rear side of the driving bevel gear bearing, is used for arranging a speed measuring device and is not communicated with the gear cavity;

the lubricating oil way is arranged in the box body, is used for supplying circulating cooling lubricating oil to the gear cavity and is communicated with the gear cavity;

and the speed measuring device is arranged in the speed measuring gear cavity and is hinged with the driving helical gear shaft.

Preferably, the four-stage turbo fan for papermaking further comprises at least one cascade pipe;

the cascade pipe is used for guiding the gas discharged from the volute outlet of the first volute into the shaft hole of the second volute and increasing the negative pressure of the shaft hole of the first volute in a cascade mode.

Preferably, the impeller is of a semi-open structure.

Preferably, the top of the gear cavity of the fan case is further provided with an observation hole.

The beneficial effects of the utility model reside in that: the negative pressure requirements of four devices can be provided at the same time; can four turbo fan linkages provide bigger negative pressure, can separately overhaul when the clapping appears in any one of four interlocked turbo fan, reduce the maintenance flow and provide.

Drawings

Fig. 1 is a schematic plan view of the present invention;

in the figure: 1. The device comprises a volute, a driving bevel gear shaft, a driven bevel gear shaft, a fan case, a fan, a speed measuring gear chamber and a driving bevel gear bearing, wherein the volute is 2, the driving bevel gear shaft is 3, the driven bevel gear shaft is 4, the fan case is 5, an impeller is 6, the gear chamber is 7, and the speed measuring gear chamber is 8.

Detailed Description

The technical solution of the present invention is further specifically described below by way of specific embodiments and with reference to the accompanying drawings.

Example 1

As shown in FIG. 1, said

A four-stage turbofan for papermaking comprising:

the fan case 4 is used for installing an impeller 5 and a volute 1 of the four-stage fan;

the driving bevel gear shaft 2 is arranged in the fan case 4 and is hinged with the fan case 4;

two driven bevel gear shafts 3 are arranged in the fan case 4, are meshed with the driving bevel gear shaft 2 and are hinged with the fan case 4;

four impellers 5 are arranged on the driven bevel gear shaft 3, driven by the driven bevel gear shaft 3 to rotate and fixedly connected with the driven bevel gear shaft 3;

the four spiral cases 1 are sleeved outside the impeller 5, the side surface of the spiral case is provided with a shaft hole, and the spiral case is radially provided with a spiral opening and is fixedly connected with the fan case 4.

The four volutes 1 and the impellers 5 are assembled into four turbo fans which are driven by the same fan case 4. Four turbo fans can use respectively, and 1 shaft hole intercommunication of single turbo fan spiral case needs the structure that provides the negative pressure, can carry out the negative pressure output to four structures simultaneously. When a structure needs to be larger than the negative pressure which can be provided by a single turbine fan, the worm port of the first turbine fan can be connected to the shaft hole of the second turbine fan, and the larger negative pressure output is improved through the communication of the turbine fans. At most four turbo fans can be connected in sequence.

The fan case 4 includes:

the gear cavity 6 is arranged in the fan case 4, is symmetrical about a central axis plane of the short side of the fan case 4 and a central axis plane of the long side of the fan case 4, and is used for arranging the driving bevel gear shaft 2 and the driven bevel gear shaft 3;

two driving bevel gear bearings 8 are arranged on the central axis of the long edge of the gear cavity 6, are used for reducing the rotation loss of the driving bevel gear shaft 2, are matched with the driving bevel gear shaft 2 to work and are not communicated with the gear cavity 6;

the speed measuring gear cavity 7 is arranged on the rear side of the driving bevel gear bearing 8, is used for arranging a speed measuring device and is not communicated with the gear cavity 6;

the lubricating oil path is arranged in the box body, is used for supplying circulating cooling lubricating oil for the gear cavity 6 and is communicated with the gear cavity 6;

the speed measuring device is arranged in the speed measuring gear cavity 7 and is hinged with the driving bevel gear shaft 2.

The four-stage turbine fan for papermaking also comprises at least one cascade pipe;

the cascade pipe is used for guiding the gas discharged from the volute port of the first volute 1 into the shaft hole of the second volute 1 and increasing the negative pressure of the shaft hole of the first volute 1 in a cascade mode.

The impeller 5 is of a semi-open structure.

And an observation hole is also formed in the top of the gear cavity 6 of the fan case 4.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A four-stage turbofan for use in papermaking comprising:

2. The four-stage turbofan for papermaking of claim 1 wherein the blower housing comprises:

3. The four-stage turbofan for papermaking according to claim 1 or 2, further comprising at least one cascade tube;

4. A four-stage turbofan for use in papermaking according to claim 1 or 2 wherein the impeller is of semi-open construction.

5. The four-stage turbofan for papermaking according to claim 2, wherein the top of the gear chamber of the blower housing is further provided with a viewing aperture.