CN2473364Y

CN2473364Y - Multistage centrafugal vacuum pump

Info

Publication number: CN2473364Y
Application number: CN 00259389
Authority: CN
Inventors: 王昌学
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-30
Filing date: 2000-11-30
Publication date: 2002-01-23
Anticipated expiration: 2010-11-30

Abstract

The utility model relates to a multistage centrifuge vacuum pump, comprising a pump body, an electric machine and a base used for bearing the pump body and the electric machine; the pump body comprises a centrifugal wheel, an air inlet section, a middle section, a baffle, a last stage baffle, an air outlet section, a shaft, a D stage bearing and a bearing pedestal; the centrifugal wheel consists of a plurality of blade wheels which are orderly stacked and coated with the shaft, the two ends of the shaft are supported in the bearing pedestal which is provided with a sealing noise device. Compared with the prior art, the utility model has the advantages of simple structure, low cost of facility and running expense, low noise and convenient maintenance, suitable for being used in the industrial region or the living region.

Description

The multistage centrifugal vacuum pump

The utility model relates to vacuum pump, especially a kind of multistage centrifugal vacuum pump.

Existing vacuum pump generally is piston type, water ring type or water jetting stream formula etc., and this vacuum pump structure complexity, equipment cost height, maintenance difficult, noise are bigger, and the operation spending is also bigger.

The purpose of this utility model is exactly that a kind of simple in structure, low price, easy to maintenance, multistage centrifugal vacuum pump that noise is low are provided in order to overcome the defective that above-mentioned prior art exists.

The purpose of this utility model can realize in the following manner: the multistage centrifugal vacuum pump, comprise the pump housing, motor and the base that carries this pump housing and motor, be characterized in, the described pump housing comprises centrifugal impeller, wind inlet section, air intake plate, stage casing, baffle plate, final stage baffle plate, wind outlet section, axle, D level bearing, bearing support, described centrifugal impeller is that a plurality of impellers superpose successively and are set on the axle, described axle two supports is provided with sealing noise device in this bearing support in bearing support.

Described centrifugal impeller forms by eight blades, a front shroud, a back shroud, a core wheel, a pressing plate riveted joint.

Described centrifugal impeller is that seven impellers superpose successively and are set on the axle.

Compared with prior art, the utility model is in order to reach industrial suitable degree of vacuum, carry out multi-stage superimposed with centrifugal impeller, be that the previous stage high-speed rotating impeller pumps to time one-level impeller intake grill with gas, the gas that inferior one-level impeller will have initial velocity continues to pump forward, stack makes wind outlet section have higher static pressure step by step, and produces lower degree of vacuum at wind inlet section.Pump characteristics is relevant with the rotating speed of impeller quantity, impeller, can determine centrifugal impeller quantity and centrifugal impeller rotating speed according to the purposes needs.The utility model is applicable to the complicated gas of big flow on suction or the delivery industry, need to be specially adapted to low noise occasion.

Fig. 1 is a pump body structure schematic representation of the present utility model;

Fig. 2 is the structural representation of centrifugal impeller among Fig. 1;

Fig. 3 is a plan view of the present utility model;

Fig. 4 is a plan view of the present utility model;

Fig. 5 is pump wasted work rate one an exhaust outlet air displacement characteristic curve diagram of the present utility model;

Fig. 6 is exhaust outlet static pressure one an exhaust outlet air displacement characteristic curve diagram of the present utility model.

Below in conjunction with accompanying drawing, and enumerate an embodiment that the vacuum pump of seven centrifugal impeller stack uses is arranged, so that the utility model is described in further detail.

Shown in Fig. 1～4, a kind of seven grades of centrifugal vacuum pumps, comprise the pump housing 1, motor 2, and the base 3 that carries this pump housing and motor, the described pump housing 1 comprises centrifugal impeller 4, wind inlet section 5, air intake plate 6, stage casing 7, baffle plate 8, final stage baffle plate 9, wind outlet section 10, axle 11, bearing support 12, described centrifugal impeller 4 be seven impellers superpose successively and be set in the axle 11 on, described each centrifugal impeller 4 is by front shroud 41, back shroud 42, curved vane 43 (8), pressing plate 44, core wheel 45 forms by rivet 46 riveted joints, described axle 11 two supports are provided with sealing noise device 13 and D level bearing 14 in this bearing support 12 in bearing support 12.

A large amount of gas flow can produce powerful noise, so whether practicality is influenced by the ambient noise of its generation also centrifugal vacuum pump, the utlity model has special seal arrangement, and the powerful noise that a large amount of gas flow are produced is sealed in the pump housing.The noise objective of its sell goods is: behind the pipeline that connects the outlet and inlet section, when (1). ambient pressure is 1016 millibars, 20 ℃ of temperature, humidity 80%; (2). the pump air quantity is 15M ³/ minute; (3). pump exhaust static pressure is 52 millimeter of mercury; (4). when the rotating speed of pump is 3440 rev/mins, record noise all less than 73dBA, obtained Ideal Characteristics curve (Fig. 5, Fig. 6) simultaneously at one meter, distance pump any point.

The utility model basic model is seven grades, with seven impellers with maximum exhaust pressure 143 millimeter of mercury (rotating speed is 3480 rev/mins) that are added to, carry gaseous mediums such as wet gas, impure gas, toxic and harmful with wind inlet section suction or wind outlet section, be applicable to that metallurgy, papermaking, cement, weaving, chemical industry, light industry etc. need the occasion of rough vacuum or big air quantity, particularly need low noise occasion.The ability to work of pump depends on the density of gas pressure difference, speed difference and gas between suction port and exhaust outlet.

Claims

1. multistage centrifugal vacuum pump, comprise the pump housing, motor and the base that carries this pump housing and motor, it is characterized in that, the described pump housing comprises centrifugal impeller, wind inlet section, air intake plate, stage casing, baffle plate, final stage baffle plate, wind outlet section, axle, D level bearing, bearing support, described centrifugal impeller is that a plurality of impellers superpose successively and are set on the axle, described axle two supports is provided with sealing noise device in this bearing support in bearing support.

2. multistage centrifugal vacuum pump according to claim 1 is characterized in that, described centrifugal impeller forms by eight blades, a front shroud, a back shroud, a core wheel, a pressing plate riveted joint.

3. multistage centrifugal vacuum pump according to claim 1 is characterized in that, described centrifugal impeller is that seven impellers superpose successively and are set on the axle.