Roots blower

A Roots blower and labyrinth technology, applied in the direction of mechanical equipment, machines/engines, rotary piston machinery, etc., can solve the problems of poor sealing effect, difficulty in manufacturing and installation, poor sealing performance, etc., and meet the requirements of lower precision, installation And maintenance is convenient, the effect of reducing the sealing gap

Inactive Publication Date: 2007-12-26
常州市风机制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings are serious wear and tear during operation, poor sealing effect and short service life
There are also non-contact labyrinth sealing devices, the sealing teeth are fixed on the rotor or stator, the sealing teeth are ring-shaped rectangular teeth, and there is a gap between the tooth end and the opposite stator or rotor. The disadvantage is poor sealing
Another non-contact labyrinth sealing device has spiral outer teeth on the rotor and spiral inner teeth on the stator. Both the spiral outer teeth and the spiral inner teeth are rectangular teeth, and the teeth are kept between the teeth ends. The effective gap, the volume between the teeth of this structure is small, the sealing performance is not very good under the working condition, the precision requirements of its processing and assembly are also very high, the processing, manufacturing and installation are difficult, and once the wear occurs, the maintenance will be difficult. more difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Referring to Fig. 1 and Fig. 2, a Roots blower includes a driving gear 1, a driven gear 2, a gearbox cover 3, a left wallboard 4, a casing 5, a rotor 6, a right wallboard 7, a bearing 8 and a bearing cover 9. The rotor 6 is composed of the impeller shaft 6-1 and the impeller 6-2. Fig. 2 is an enlarged view of part I of Fig. 1. In Fig. 2, the impeller shaft 6-1 has trapezoidal external teeth 12, and the left wallboard has 4 shaft holes There are rectangular internal teeth 13 on the labyrinth cover 10, and the labyrinth cover 10 is made of cast aluminum material. The trapezoidal external teeth 12 on the impeller shaft 6-1 and the rectangular internal teeth 13 on the labyrinth sleeve 10 all adopt ring-shaped teeth, and the number of teeth is 3 to 11 teeth. In the working state, at least three pairs of teeth at the tooth ends of the trapezoidal external teeth 12 and the rectangular internal teeth 13 are opposite to each other, and there is a small gap, which ensures that th...

Embodiment 2

[0022] Embodiment 2 is a modified example of Embodiment 1. Referring to Fig. 1 and Fig. 4, it can be seen that Fig. 4 is a modification example of part I in Fig. 1, that is, a modification example of Fig. 2 . Among Fig. 4, there is trapezoidal outer tooth 12 on the impeller shaft 6-1, and the labyrinth cover 10 in the 4 shaft holes of the left wallboard is formed by fastening the labyrinth outer cover 10-2 and the labyrinth inner cover 10-1. The outer labyrinth 10-2 is made of cast iron, and the inner labyrinth 10-1 is made of cast aluminum. The labyrinth inner sleeve 10-1 has rectangular inner teeth 13, the trapezoidal outer teeth 12 on the impeller shaft 6-1 and the rectangular inner teeth 13 on the labyrinth inner sleeve 10-1 are both annular teeth, and the number of teeth is 3~ 11 teeth. All the other structures are the same as in Embodiment 1.

Embodiment 3

[0024] Embodiment 3 is another transformation of Embodiment 1. Referring to FIG. 1 and FIG. 5 , it can be known that FIG. 5 is a modification example of part II in FIG. 1 , that is, a modification example of FIG. 3 . In Fig. 5, the impeller shaft 6-1 is fixedly sleeved with a labyrinth shaft sleeve 11, and the labyrinth shaft sleeve 11 has trapezoidal outer teeth 12, and a labyrinth sleeve 10 is housed in the 7 shaft holes of the right wallboard, and the labyrinth sleeve 10 is formed by a labyrinth jacket 10- 2 and the labyrinth inner sleeve 10-1 are fastened, and the labyrinth inner sleeve 10-1 has rectangular inner teeth 13. The outer labyrinth 10-1 is made of cast iron, and the inner labyrinth 10-1 is made of cast aluminum. Both the trapezoidal outer teeth 12 on the labyrinth shaft sleeve 11 and the rectangular inner teeth 13 on the inner labyrinth sleeve 10-1 are annular teeth, and the number of teeth is 3 to 11 teeth. All the other structures are the same as in Embodime...

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Abstract

This invention relates to a Roots fan with a maze close device including an active gear, a driven gear, a gear box cover, a left wall plate, a shell, a rotor, a right wall plate, a bearing and a cover, in which a staged outer gear is set on an impeller shaft of the rotor or a staged outer gear is fixedly set on the maze shaft jacket on the impeller shaft and a rectangle inner gear is set on the maze sleeve in the shaft hole of the right and left wall plates, and cast-Al is used for the maze jacket, which is fastened by inner and outer jackets and the outer jacket can be made of cast-iron material.

Description

technical field [0001] The invention belongs to equipment for conveying gas, in particular to a Roots blower with a labyrinth sealing device. Background technique [0002] Generally, the Roots blower will cause gas leakage when transporting gas, thereby reducing the efficiency of the fan. Therefore, in order to prevent gas leakage, a sealing device is used between the impeller shaft and the wallboard. In the prior art, it is more common to use contact type dynamic seals, such as stuffing seals, O-ring seals and the like. Its disadvantages are serious wear and tear during operation, poor sealing effect and short service life. There are also non-contact labyrinth sealing devices, the sealing teeth are fixed on the rotor or stator, the sealing teeth are ring-shaped rectangular teeth, and there is a gap between the tooth end and the opposite stator or rotor. The disadvantage is poor sealing. Another non-contact labyrinth sealing device has spiral outer teeth on the rotor and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C27/00F04C18/14
Inventor 巢伯新
Owner 常州市风机制造有限公司
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