CN100554696C

CN100554696C - A kind of Roots blower

Info

Publication number: CN100554696C
Application number: CNB2007100239949A
Authority: CN
Inventors: 巢伯新
Original assignee: Fans Manufacture Co Ltd Changzhou City
Current assignee: Fans Manufacture Co Ltd Changzhou City
Priority date: 2007-07-03
Filing date: 2007-07-03
Publication date: 2009-10-28
Anticipated expiration: 2027-07-03
Also published as: CN101092961A

Abstract

The invention belongs to a kind of equipment of conveying gas, particularly relate to a kind of Roots blower with labyrinth-type excluder.It comprises driving gear, driven gear, gearbox cover, left wallboard, casing, rotor, right wallboard, bearing and bearing cap.Have on the impeller shaft of rotor on the labyrinth axle sleeve that overlaps admittedly on the impeller shaft of ladder type external tooth or rotor and have the ladder type external tooth; Has square type internal tooth on the labyrinth bush in the left and right wallboard axis hole.Labyrinth bush preferably adopts casting aluminium material.Labyrinth bush also can be by fastening the forming of cover in labyrinth overcoat and the labyrinth, and the labyrinth overcoat can adopt cast iron materials, and cover can adopt casting aluminium material in the labyrinth.Roots blower with this labyrinth-type excluder, good seal performance, the fan efficiency height, convenient processing and manufacture, and be easy to install and maintenance.

Description

A kind of Roots blower

Technical field

The invention belongs to the equipment of conveying gas, particularly relate to a kind of Roots blower that has labyrinth-type excluder.

Background technique

General Roots blower all can produce the leakage problem of gas when conveying gas, thereby has reduced the efficient of blower fan.Therefore, for preventing gas leakage, between impeller shaft and wallboard, all adopt seal arrangement.In prior art, comparatively generally adopt the contact type motive sealing, as packing seal, the sealing of O type circle etc.Its deficiency is on-stream serious wear, and sealing effect is poor, and working life is short.Also have plenty of and adopt contactless labyrinth gland, its sealing tooth is to be fixed on rotor or the stator, and the sealing tooth is ring-like rectangular gear, maintains the gap between stator that increment is relative with it or the rotor, and the shortcoming of this structure is that sealing is poor.Another kind of contactless labyrinth gland is to have the spiral external tooth on rotor, and on stator, has the spiral internal tooth, its spiral external tooth and spiral internal tooth are rectangular gear, the gap of remaining valid between the increment of tooth and tooth, the volume of this structure between cog is less, and working state lower seal performance neither be fine, the required precision of its processing and assembling is also all very high, in a single day manufacturing and installation are all difficult, and wear and tear, maintenance is just more difficult.

Summary of the invention

The purpose of this invention is to provide a kind of good seal performance that has, convenient processing and manufacture, and be easy to the Roots blower of the labyrinth-type excluder installing and keep in repair.

Technological scheme of the present invention is; A kind of Roots blower, comprise driving gear, driven gear, gearbox cover, left wallboard, casing, rotor, right wallboard, bearing and bearing cap, have on the impeller shaft of rotor on the labyrinth axle sleeve that overlaps admittedly on the impeller shaft of ladder type external tooth or rotor and have the ladder type external tooth; And has square type internal tooth on the labyrinth bush in the left and right wallboard axis hole.

For the sealability of Roots blower of the present invention under high pressure, the condition of high temperature further improved, labyrinth bush preferably adopts casting aluminium material.

Described labyrinth bush can be put in the labyrinth and be had square type internal tooth by fastening the forming of cover in labyrinth overcoat and the labyrinth, and is easy to maintenance like this and reduced cost.

Described labyrinth overcoat can adopt cast iron materials, and cover can adopt casting aluminium material in the labyrinth.

The number of teeth of the square type internal tooth of ladder type external tooth on the described impeller shaft or on the axle sleeve of labyrinth and labyrinth bush is 3～11 teeth.

The number of teeth of the square type internal tooth of cover is 3～11 teeth in ladder type external tooth on the described impeller shaft or on the axle sleeve of labyrinth and the labyrinth.

Described ladder type external tooth and square type internal tooth are preferably annular tooth.

The invention has the beneficial effects as follows,, improved the efficient of sealability and blower fan owing on the impeller shaft or adopted on the axle sleeve of labyrinth and adopted square type internal tooth on ladder type external tooth and the labyrinth bush, thereby enlarged the volume of between cog in working order down.Simultaneously owing to adopted the square type internal tooth of ladder type external tooth and labyrinth bush to match, and the axial dimension of ladder type tooth increment is less than the axial dimension of the rectangular gear increment that is mated, we only require that again increment gets final product relatively when mounted, therefore, in processing and assembling, allow impeller shaft that a certain amount of axial displacement is arranged, so just reduced the requirement of the precision of processing and installation, thereby easily manufactured, it is also all comparatively convenient to install and keep in repair.In addition, after the employing casting aluminium material is made and is overlapped in labyrinth bush or the labyrinth, because the wallboard that itself and cast iron materials are made or the expansion coefficient of labyrinth overcoat are different, thereby high pressure and cause labyrinth bush under the situation of high temperature or the labyrinth in the square type internal tooth that overlaps can expand to internal diameter direction, further reduce seal clearance, thereby improved sealability.In case move (as bearing wear) when bad, hard ladder type tooth and softer rectangular gear, increment is reconditioning voluntarily, reaches desirable gap state, has guaranteed the stability of fan operation.

Description of drawings

Fig. 1 is the sectional arrangement drawing of a kind of Roots blower of the present invention;

Fig. 2 is the I portion enlarged view of Fig. 1;

Fig. 3 is that the II portion of Fig. 1 is placed on figure;

Fig. 4 is the conversion embodiment of the I portion among Fig. 1, also is the conversion example of Fig. 2;

Fig. 5 is the conversion embodiment of the II portion among Fig. 1, also is the conversion example of Fig. 3.

Embodiment

The present invention is described in further detail below in conjunction with embodiment that accompanying drawing provides.

Embodiment one

Referring to Fig. 1, Fig. 2, a kind of Roots blower, comprise that driving gear 1, driven gear 2, gearbox cover 3, left wallboard 4, casing 5, rotor 6, right wallboard 7, bearing 8 and bearing cap 9, rotor 6 be made up of impeller shaft 6-1 and impeller 6-2, Fig. 2 is the I portion enlarged view of Fig. 1, in Fig. 2, has ladder type external tooth 12 on the impeller shaft 6-1, have square type internal tooth 13 on the labyrinth bush 10 in wallboard 4 axis holes of a left side, labyrinth bush 10 is to be made by casting aluminium material.Ladder type external tooth 12 on the impeller shaft 6-1 and the square type internal tooth 13 on the labyrinth bush 10 all adopt ring-like tooth, and the number of teeth are 3～11 teeth.To have three pairs of teeth at least with square type internal tooth 13 increments be that the tooth tooth is relative to ladder type external tooth 12 during working state, and micro-gap is arranged, and so just guaranteed that between on-stream impeller shaft 6-1 and the labyrinth bush 10 be contactless state, do not have friction, reduced power consumption.And the bigger volume of between cog has further improved the efficient of sealability and blower fan.

Referring to Fig. 1, Fig. 3 as can be known, Fig. 3 is the II portion enlarged view of Fig. 1.Have ladder type external tooth 12 on the labyrinth axle sleeve 11 of solid cover on the impeller shaft 6-1 in Fig. 3, and have square type internal tooth 13 on the labyrinth bush 10 in right wallboard 7 axis holes, labyrinth bush 10 is to be made by casting aluminium material.Ladder type external tooth 12 adopts annular tooth with square type internal tooth 13, and the number of teeth is 3～11 teeth.

Embodiment two

Embodiment two is a kind of conversion examples of embodiment one.Participate in Fig. 1, Fig. 4 as can be known, Fig. 4 is the conversion example of I portion among Fig. 1, also is the conversion example of Fig. 2.Among Fig. 4, have ladder type external tooth 12 on the impeller shaft 6-1, the labyrinth bush 10 in left wallboard 4 axis holes is that 10-1 is fastening to form by overlapping in labyrinth overcoat 10-2 and the labyrinth.Labyrinth overcoat 10-2 is made by cast iron materials, and cover 10-1 is made by casting aluminium material in the labyrinth.Cover 10-1 has square type internal tooth 13 in the labyrinth, and the square type internal tooth 13 in ladder type external tooth 12 on the impeller shaft 6-1 and the labyrinth on the cover 10-1 all adopts annular tooth, and the number of teeth is 3～11 teeth.All the other structures are identical with embodiment one.

Embodiment three

Embodiment three is another conversion of embodiment one.Referring to Fig. 1, Fig. 5 as can be known, Fig. 5 is the conversion example of II portion among Fig. 1, also is the conversion example of Fig. 3.Be installed with labyrinth axle sleeve 11 among Fig. 5 on the impeller shaft 6-1, has ladder type external tooth 12 on the labyrinth axle sleeve 11, in right wallboard 7 axis holes labyrinth bush 10 is housed, labyrinth bush 10 is that 10-1 is fastening to form by overlapping in labyrinth overcoat 10-2 and the labyrinth, has square type internal tooth 13 on the cover 10-1 in the labyrinth.Labyrinth overcoat 10-1 is made by cast iron materials, and cover 10-1 is made by casting aluminium material in the labyrinth.Square type internal tooth 13 in ladder type external tooth 12 on the labyrinth axle sleeve 11 and the labyrinth on the cover 10-1 all adopts annular tooth, and the number of teeth is 3～11 teeth.All the other structures are identical with embodiment one.

In the foregoing description, ladder type external tooth 12 and square type internal tooth 13 can be helical tooth simultaneously also, but it is good to be annular dental transition.

Claims

1, a kind of Roots blower, comprise driving gear (1), driven gear (2), gearbox cover (3), left wallboard (4), casing (5), rotor (6), right wallboard (7), bearing (8) and bearing cap (9), it is characterized in that: the impeller shaft (6-1) that has ladder type external tooth (12) or rotor (6) on the impeller shaft (6-1) of rotor (6) upward has ladder type external tooth (12) on the labyrinth axle sleeve (11) of cover admittedly; And have square type internal tooth (13) on the labyrinth bush (10) in left and right wallboard (4, the 7) axis hole.

2, Roots blower according to claim 1 is characterized in that: labyrinth bush (10) adopts casting aluminium material to make.

3, Roots blower according to claim 1 is characterized in that: labyrinth bush (10) is that (10-1) is fastening to form by overlapping in labyrinth overcoat (10-2) and the labyrinth, has square type internal tooth (13) on the cover (10-1) in the labyrinth.

4, Roots blower according to claim 3 is characterized in that: labyrinth overcoat (10-2) adopts cast iron materials to make, and cover (10-1) adopts casting aluminium material to make in the labyrinth.

5, Roots blower according to claim 1 and 2 is characterized in that: impeller shaft (6-1) go up or labyrinth axle sleeve (11) on the number of teeth of ladder type external tooth (12) and the square type internal tooth (13) of labyrinth bush (10) be 3～11 teeth.

6, according to claim 3 or 4 described Roots blowers, it is characterized in that: impeller shaft (6-1) go up or labyrinth axle sleeve (11) on ladder type external tooth (12) and labyrinth in overlap the square type internal tooth (13) on (10-1) the number of teeth be 3～11 teeth.

7, according to claim 1 or 2 or 3 or 4 described Roots blowers, it is characterized in that: ladder type external tooth (12) is annular tooth with square type internal tooth (13).