CN201163203Y

CN201163203Y - Light elliptic gear flowmeter

Info

Publication number: CN201163203Y
Application number: CNU2007200435672U
Authority: CN
Inventors: 朱操胜; 甘晓梅; 郭炜炎; 林琳
Original assignee: HEFEI JINGDA INSTRUMENT CO Ltd
Current assignee: HEFEI JINGDA INSTRUMENT CO Ltd
Priority date: 2007-10-10
Filing date: 2007-10-10
Publication date: 2008-12-10
Anticipated expiration: 2017-10-10

Abstract

A light oval gear flowmeter consists of a casing and a pair of oval gears which are arranged inside the casing and can roll relative to each other so as to carry out contact rotation, wherein the oval gears are supported on a gear shaft through bearings; and one end of the gear shaft is fixed on the bottom plate of the casing, while the other end is fixed on the cover plate of the casing. The light oval gear flowmeter is characterized in that: the casing is made of aluminum alloy, while the oval gears are made of engineering plastics; and the bearing is set as a rolling bearing. Through reasonable material selection and structure improvement, the light oval gear flowmeter effectively reduces deadweight, pressure loss and abrasion, and broadens small flow measurable range.

Description

Light-duty oval gear flowmeter

Technical field:

The utility model relates to volumeter, the oval gear flowmeter of more specifically saying so.

Background technology:

Oval gear flowmeter is a kind of of volumeter, its measuring sensor is a pair of intermeshing oval gear, utilize a pair of so oval rotor that the measuring room inner fluid continuously is divided into single known volume part, one by one, repeatedly be full of and the number of times that discharges this volume segment fluid flow is measured the flow volume total amount according to measuring room.Its principle of work is illustrated in fig. 1 shown below.

Referring to Fig. 1, two elliptic gears have the special shape that mutual rolling contacts rotation.P1 and p2 represent inlet pressure and top hole pressure respectively, obviously p1＞p2.Fig. 1 (a) below gear produces rotation counterclockwise under the effect of pressure at both sides difference, be driving wheel; The top gear does not produce turning moment because of pressure at both sides equates, is engaged wheel, by the below gear driven, and the clockwise direction rotation.When Fig. 1 (b) position, two gears all produce turning moment under the differential pressure effect, continue rotation.When rotating to Fig. 1 (c) position, the top gear becomes driving wheel, and the below gear then becomes engaged wheel, continues to rotate to and Fig. 1 (a) same position, finishes a circulation.One time do action is discharged four fluid volumes by the crescent cavity that surrounds between gear and shell wall, and this volume is called " the circulation volume " of flowmeter.If flowmeter " circulation volume " is υ, certain hour annular wheel number of revolutions is N, and the fluid volume that then flows through flowmeter in this time is V, then V=N υ.The rotation of elliptic gear passes to the total amount that counter directly indicates the flowmeter of flowing through by magnetic seal shaft coupling and transmission speed reducer structure.If behind the additional transmitting device, be equipped with electric Displaying Meter again and can realize that teletransmission shows instantaneous delivery or integrated flux.

Oval gear flowmeter measuring accuracy height, and have long-term behaviour retentivity and good reproducibility, at the total amount or the flow of industrial sectors such as oil, chemical industry, coating, medicine, food and energy metering expensive media.In these process industries as: soup injection, extraction or mixing match control, catalyst, rigidizer, polymerization prevent the quantitative injection of adjuvant such as agent in the chemical liquids, add spices, the weight feed of paint line coating etc. to food fluids and cosmetics.Maximum purposes is meterings such as the accumulating handing-over of petroleum product etc. and distribution, and these applications can be used as the foundation of financial accounting or as the legal metering of paying taxes and both parties implement contract.

Because the oval gear flowmeter usable range is extensive, the medium of metering is complicated and changeable, and in different use occasions, the corrosivity condition has nothing in common with each other, and therefore will select the material of instrument according to the corrosivity of fluid.The oval gear flowmeter of selling on the existing market, the material of its core component housing and elliptic gear is cast iron, cast steel or stainless steel, every kind of material all has usable range separately.What adopt between the rotor of flowmeter and the axle is sliding bearing.Oval gear flowmeter is a water engine that absorbs less energy from fluid in principle, and this energy is used for overcoming the friction force of flow detecting element and annex rotation, flows into and flows out two ends formation pressure in instrument simultaneously and fall.But, above-mentioned material select setting with structure for use, make that existing oval gear flowmeter is very heavy, the scope surveyed of the large and small flow of the pressure loss is little, wearing and tearing big.

Summary of the invention:

The utility model is for avoiding above-mentioned existing in prior technology weak point, providing a kind of low wearing and tearing light-duty oval gear flowmeter.By the improvement of rational Material Selection and structure, alleviate himself weight, reduce the pressure loss, widen low discharge measurable range, reduce wearing and tearing, and make and install easily at low-pressure or gravity flow situation down-off meter.

The technical scheme that the utility model technical solution problem is adopted is:

The utility model is had two elliptic gears that mutual rolling contacts rotation and is constituted by a pair of in housing and the housing, and elliptic gear is bearing on the gear shaft by bearing, and an end of gear shaft is fixed on the base plate of housing, and the other end is fixed on the housing cover;

Design feature of the present utility model is that housing is material with the aluminium alloy, and elliptic gear is material with engineering plastics, and bearing is set to rolling bearing.

Compared with the prior art, the beneficial effects of the utility model are embodied in:

1, the density of aluminium alloy is about 1/3 of cast iron and steel, and the density of engineering plastics is littler, has only 1/7 to 1/4 of iron and steel, and therefore, the utility model has alleviated the weight of flowmeter greatly by the choose reasonable of material.

2, aluminium alloy all has good anti-corrosion in the solution of atmosphere, water and weak acid and weak base and other well-oxygenated environments, the corrosion of anti-organic acid and solvent, and therefore, the utility model can be suitable for wider working environment.

3, engineering plastics are as a kind of new construction material, use more and more extensivelyr in daily use, and it is except light weight, the incomparable advantage of Other Engineering material is also arranged, comprise good resistance to chemical corrosion, outstanding anti-attrition, anti-wear performance, good noise reduction absorbing etc.The utility model is also therefore applicable to wider medium scope.

4, because of the characteristic of engineering plastics light weight and anti-attrition, be equipped with the version of rolling bearing, the utility model has effectively reduced rotor and housing, friction force between rotor and cover plate and rotor and the gear shaft, the pressure loss of flowmeter and measurable lower limit flow thereby effectively reduced.Noise when the wear resistance of while plastics and the serviceable life that the noise reduction absorbing has also prolonged instrument and big flow operation.

Description of drawings:

Fig. 1 (a), Fig. 1 (b), Fig. 1 (c) and Fig. 1 (d) are the utility model principle of work synoptic diagram.

Fig. 2 is the utility model sectional structure synoptic diagram.

Number in the figure: 1 housing, 2 elliptic gears, 3 pads, 4 bearings, 5 gear shafts, 6 housing covers.

Below by embodiment, the utility model is described in further detail in conjunction with the accompanying drawings:

Embodiment:

Referring to Fig. 1, Fig. 2, identical with prior art is, present embodiment is had two elliptic gears 2 that mutual rolling contacts rotation and is constituted by a pair of in housing 1 and the housing 1, elliptic gear 2 is bearing on the gear shaft 5 by bearing 4, one end of gear shaft 5 is fixed on the base plate of housing 1, and the other end is fixed on the housing cover 6;

To what prior art made improvements be, in the present embodiment, housing 1 is a material with the aluminium alloy, and elliptic gear 2 is a material with engineering plastics, and bearing 4 is set to rolling bearing.

The corresponding structure setting also comprises, in order to guarantee sealing and lubricated, between the bottom surface and housing cover 6 of rolling bearing 4 and housing 1, teflon gasket 3 is set.

In concrete the enforcement, be applicable to that engineering plastics as elliptic gear comprise epoxy plastics in the thermosetting plastics, poly-right-hydroxybenzoic acid fat plastics; Polycarbonate in the thermoplastics, chlorinated polyether, polysulfones and polyphenylene sulfide etc.

In concrete the enforcement, be applicable to that aluminum alloy materials as housing can be aluminium-silicon-copper-magnesium series in the Birmasil and high strength, high-air-tightness and the Lo-Ex in the aluminium silicon zinc-magnesium system, as ZL111 and ZL115 etc.

Claims

1, light-duty oval gear flowmeter, two elliptic gears (2) that contacted rotation by housing (1) with a pair of mutual rolling in the housing (1) constitute, described elliptic gear (2) is bearing on the gear shaft (5) by bearing (4), one end of gear shaft (5) is fixed on the base plate of housing (1), and the other end is fixed on the housing cover (6); It is characterized in that described housing (1) is material with the aluminium alloy, described elliptic gear (2) is material with engineering plastics, and described bearing (4) is set to rolling bearing.

2, light-duty oval gear flowmeter according to claim 1 is characterized in that being provided with teflon gasket (3) between the base plate and housing cover (6) of described bearing (4) and housing (1).