CN203098404U

CN203098404U - Multistage turbine vacuum pump detachable backflow device

Info

Publication number: CN203098404U
Application number: CN 201320051494
Authority: CN
Inventors: 李月仙; 杨媛媛
Original assignee: HANGZHOU ZHENXING INDUSTRIAL PUMP MANUFACTURE Co Ltd
Current assignee: HANGZHOU ZHENXING INDUSTRIAL PUMP MANUFACTURE Co Ltd
Priority date: 2013-01-30
Filing date: 2013-01-30
Publication date: 2013-07-31
Anticipated expiration: 2023-01-30

Abstract

A multistage turbine vacuum pump detachable backflow device belongs to the technical field of vacuum pumps and is characterized by comprising a backflow device body and a backflow device base which are matched and connected. Backflow device blades are arranged between the backflow device body and the backflow device base, and the backflow device body is sleeved on a spindle between a front-stage impeller and a rear-stage impeller through a middle shaft sleeve. The multistage turbine vacuum pump detachable backflow device is novel in conception and reasonable in structure, integrates traditional two adjacent stages of partition plates on the front portion and partition plates on the rear portion and a traditional backflow device, adopts a detachable mode in structure, achieves the purpose of being simple in structure and optimizing the structure, meanwhile is convenient to cast and process, wholly reduces processing procedures, optimizes assembling programs and is convenient for a user to overhaul and clean.

Description

The removable return channel of multistage turbine vacuum pump

Technical field

The utility model belongs to the vacuum pump technology field, is specifically related to a kind of removable return channel that is applicable to multistage turbine vacuum pump.

Background technique

The complete machine performance of multistage turbine vacuum pump not only depends on the aeroperformance of rotary blades at different levels itself, and closely related with the aeroperformance of the bend of inter-stage, return channel.The effect of return channel is that higher level's impeller outlet air-flow radially is transformed into vertically and mobile uniform airflow, to make it into people's next stage impeller, but the mobile phase in the return channel is when complicated, there is strong energy loss, and the number with the increase return channel of progression increases synchronously, and the energy of loss can produce a very large impact performances such as the flow of whole unit, degree of vacuum.Therefore, return channel is the important stationarity element of high-speed multistage turbine vacuum pump, reasonably design the return channel structure, and the outlet smoothness of assurance stator blade, even, can make that flow losses reduce, the operating mode range widens, reducing adverse effect, thereby improve the complete machine performance to the following stages impeller.

In the common technique, the return channel that inter-stage Diffuser, bend constitute is the cast inblock structure, bend is encirclement type structure, make the blade of inter-stage Diffuser be difficult to cleaning, especially work as multistage turbine vacuum pump and be applied to the papermaking vacuum system, the pulp residue that each vacuum dehydration element is come is constantly gathered, and stops up inter-stage bend and Diffuser gradually, cause degree of vacuum to descend, have a strong impact on the normal performance of complete machine performance.

The model utility content

The utility model aims to provide a kind of removable return channel technological scheme of multistage turbine vacuum pump, to overcome problems of the prior art.

The removable return channel of described multistage turbine vacuum pump, it is characterized in that comprising the return channel body, the return channel base that are connected, between return channel body and the return channel base return channel blade is set, the return channel body is arranged on the main shaft between the front and back stages impeller by the socket of jack shaft cover.

The removable return channel of described multistage turbine vacuum pump is characterized in that adopting between described return channel body and the return channel base attachment screw to fixedly connected, and described attachment screw passes the return channel blade and is connected cooperation with return channel body, return channel base.

The removable return channel of described multistage turbine vacuum pump is characterized in that described return channel body adopts Pierced structure, and hollow out position correspondence is provided with the return channel cover plate, and the return channel cover plate is fixedlyed connected with the return channel body by set screw.

The removable return channel of described multistage turbine vacuum pump is characterized in that described return channel base comprises bend dividing plate, back level backflow dividing plate, constitutes integral structure by connecting tendon between bend dividing plate, the back level backflow dividing plate.

The removable return channel of described multistage turbine vacuum pump is characterized in that described return channel body, return channel base adopt the horizonally split structure respectively.

The removable return channel of described multistage turbine vacuum pump is characterized in that described return channel blade adopts wing-shaped structure.

The removable return channel of described multistage turbine vacuum pump is characterized in that described return channel blade is equipped with on the return channel body, and return channel blade and return channel body employing integral structure.

The removable return channel of described multistage turbine vacuum pump is characterized in that being equipped with the wheel cap sealer between described back level backflow dividing plate and the corresponding impeller.

The removable return channel of above-mentioned multistage turbine vacuum pump, novel, rational in infrastructure, dividing plate, the return channel of traditional adjacent two-stage in front and back are implemented to integrate, and structurally adopt split-type, realize the effect of structure simple optimizing, be convenient to casting, processing simultaneously, reduced manufacturing procedure on the whole, optimize linkage editor, also be convenient to the user maintenance cleaning.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is a K-K sectional drawing among Fig. 1;

Among the figure: axle sleeve in the middle of level backflow dividing plate, 6-wheel cap sealer, the 7-behind 1-return channel blade, 2-attachment screw, 3-first stage impeller, 4-return channel body, 5-return channel base, 5a-bend dividing plate, 5-connecting tendon b, the 5c-, 8-time grade of impeller, 9-main shaft, 10-set screw, 11-return channel cover plate, 12-spiral case, 13-chopped-off head dividing plate, 14-chopped-off head wheel cap sealer.

Embodiment

Now, describe embodiment of the present utility model in detail in conjunction with Figure of description:

As shown be the removable return channel of multistage turbine vacuum pump, comprise the return channel body 4, the return channel base 5 that are connected, constitute air-flow path respectively between the return channel body 4 of return channel base 5 and forward and backward two-stage; Return channel body 4 is arranged on the main shaft 9 between the front and back stages impeller by middle axle sleeve 7 sockets, return channel body 4 adopts Pierced structure to reduce manufacture cost to save material, hollow out position correspondence is provided with return channel cover plate 11, and return channel cover plate 11 is fixedlyed connected with return channel body 4 by set screw 10; Return channel base 5 comprises bend dividing plate 5a, back level backflow dividing plate 5c, constitute integral structure by connecting tendon 5b between bend dividing plate 5a, the back level backflow dividing plate 5c, be bend dividing plate 5a, back level backflow dividing plate 5c, the moulding of connecting tendon 5b integrally casting, return channel base 5 adopts this integrally casting structure can reduce manufacturing procedure, optimizes linkage editor; Constitute air-flow path between bend dividing plate 5a and the return channel body 4, be wholely set return channel blade 1 on the return channel body 4 in this air-flow path, be return channel blade 1 and the 4 integrally casting moulding of return channel body, return channel blade 1 adopts wing-shaped structure simultaneously, promptly have certain camber, two is the pointed structure that is similar to wing, adopts that this blade structure flow losses are less, aeroperformance is better; Back level backflow dividing plate 5c constitutes return flow lines with the return channel body 4 of back one-level, is equipped with wheel cap sealer 6 to prevent inter-stage gas blowby, leakage between back level backflow dividing plate 5c and the corresponding impeller; Adopt attachment screw 2 to fixedly connected between return channel body 4 and the return channel base 5, attachment screw 2 is mounted on the hollow out position of return channel body 4, passing return channel blade 1 simultaneously is connected with the bend dividing plate 5a of return channel base 5, attachment screw 2 adopts and passes return channel blade 1 and be connected the space that does not take air-flow path with between return channel body 4 and the return channel base 5, can not hinder runner, and attachment screw 2 is located at the hollow out position of return channel body 4, the hollow out position is by 11 sealings of return channel cover plate, can make attachment screw 2 avoid not contacting with gas.

Return channel body 4 described in the foregoing description, return channel base 5 adopt the horizonally split structure respectively, return channel blade 1 is wholely set on return channel body 4, return channel base 5 splits with top and spiral case 12 splits to pass through screw between the top, when opening the loam cake of spiral case 12, the part of each subdivision is all removed with spiral case, convenient maintenance.

Below to be applied to the papermaking vacuum system be example and in conjunction with Fig. 1 mounting structure of the present utility model and working procedure are described further with the utility model:

Return channel body 4 is arranged on the main shaft 9 between first stage impeller 3, the secondary impeller 8 by middle axle sleeve 7 sockets, first stage impeller 3 entry end settings are connected the chopped-off head dividing plate 13 that cooperates with the bend dividing plate 5a of return channel base 5, corresponding first stage impeller 3 is equipped with chopped-off head wheel cap sealer 14 on the chopped-off head dividing plate 13, is equipped with wheel cap sealer 6 between back level backflow dividing plate 5c and the secondary impeller 8; Saturated vapour enters the mouth from spiral case 12 from one-level and is sucked up to first stage impeller 3 inlets, process is by first stage impeller 3 superchargings of the high speed rotating of main shaft 9 drives, arrive chopped-off head dividing plate 13 and the passage that first order return channel body 4 forms, be sucked into secondary impeller 8 inlets through first order return channel blade 1; The saturated vapour of coming from the secondary inlet of spiral case 12 passes first order return channel base 5 and also is sucked into secondary impeller 8 inlets simultaneously; Be pooled to secondary impeller 8 superchargings of the gas process of secondary impeller 8 inlets by the high speed rotating of main shaft 9 drives, arrive the passage that first order return channel base 5 and second level return channel body 4 form, the next stage return channel roughly the same.

In the foregoing description, the linkage structure of impeller, main shaft, spiral case and chopped-off head dividing plate is a prior art, does not repeat them here.

Claims

1. the removable return channel of multistage turbine vacuum pump, it is characterized in that comprising the return channel body (4), the return channel base (5) that are connected, between return channel body (4) and the return channel base (5) return channel blade (1) is set, return channel body (4) is arranged on the main shaft (9) between the front and back stages impeller by middle axle sleeve (7) socket.

2. the removable return channel of multistage turbine vacuum pump as claimed in claim 1, it is characterized in that adopting attachment screw (2) to fixedly connected between described return channel body (4) and the return channel base (5), described attachment screw (2) passes return channel blade (1) and is connected cooperation with return channel body (4), return channel base (5).

3. the removable return channel of multistage turbine vacuum pump as claimed in claim 1, it is characterized in that described return channel body (4) adopts Pierced structure, hollow out position correspondence is provided with return channel cover plate (11), and return channel cover plate (11) is fixedlyed connected with return channel body (4) by set screw (10).

4. the removable return channel of multistage turbine vacuum pump as claimed in claim 1, it is characterized in that described return channel base (5) comprises bend dividing plate (5a), back level backflow dividing plate (5c), constitutes integral structure by connecting tendon (5b) between bend dividing plate (5a), the back level backflow dividing plate (5c).

5. the removable return channel of multistage turbine vacuum pump as claimed in claim 1 is characterized in that described return channel body (4), return channel base (5) adopt the horizonally split structure respectively.

6. the removable return channel of multistage turbine vacuum pump as claimed in claim 1 is characterized in that described return channel blade (1) adopts wing-shaped structure.

7. the removable return channel of multistage turbine vacuum pump as claimed in claim 1 is characterized in that described return channel blade (1) is equipped with on return channel body (4), and return channel blade (1) adopts integral structure with return channel body (4).

8. the removable return channel of multistage turbine vacuum pump as claimed in claim 4 is characterized in that being equipped with wheel cap sealer (6) between described back level backflow dividing plate (5c) and the corresponding impeller.