CN201251462Y

CN201251462Y - Fluid metering device

Info

Publication number: CN201251462Y
Application number: CNU2008201625221U
Authority: CN
Inventors: 王宾
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-07
Filing date: 2008-08-07
Publication date: 2009-06-03
Anticipated expiration: 2018-08-07

Abstract

The utility model discloses a fluid metering device, comprising a flowing cylinder. A rotatable blade wheel is arranged inside the flowing cylinder, and at least one blade of the blade wheel is provided with magnetic steel or pontil, or the blades themselves have magnetic property or magnetic conductibility. The flowing cylinder is provided outside with corresponding signal counter blocks, a guide apparatus is arranged in front of the blades for guiding fluid and forming vortex, and a plurality of helical guide vanes are arranged inside the guide apparatus. The technical scheme is that the guide apparatus is arranged in front of the blade wheel, a plurality of helical guide vanes (usually 4) are arranged inside the guide apparatus, so the structure has the largest front face area, the whole rectifying effect is better than that of the traditional structure, and fluid in any form can be effectively rectified to rotational flow with a uniform direction. Therefore, all fluid passing through the guide apparatus can be effectively rectified to vortex to impact and drive the blade wheel, which avoids metering error resulted from intermittently passing of fluid, and can control the practical metering error within 1% of the whole oiling quantity when applied to a portable fuel filling metering mechanism.

Description

A kind of apparatus for metering fluids

Technical field

The utility model belongs to field of measuring techniques, particularly relates to a kind of apparatus for metering fluids.

Background technology

Existing apparatus for metering fluids, be divided into two kinds of mechanical metering method and electronics metering methods, the machinery metering method is because complex structure, parts use fewer and feweri more, the electronics metering method then mainly adopts the impeller or the turbine that can be promoted rotation by fluid is set in the overcurrent tube, magnet steel or iron staff are set on impeller or turbine, at overcurrent tube outside signalization counter block (for example Hall element), because fluid can promote impeller or turbine rotation through out-of-date, and the signal-count parts can be counted the rotation of impeller or turbine, can realize the metering of convection cell throughput by converting.But this structure is directly used in when measuring the fluid that intermittently passes through, and but has bigger error in dipping.For example with this structure applications in portable vehicle Fuel-filling metering device; the measuring apparatus that original group refueling metering all only is the dependence refuelling station shows and calculates; the consumer can not measure and detect volume read-out by other means; often cause the consumer to be subjected to the deception of some non-honest refuelling station businessmans; therefore caused the generation of portable vehicle Fuel-filling metering device; electronic type group refueling meter promptly adopts said structure; according to testing the actual metered error at about 2%～3% of total volume read-out; because it is bigger with the measuring apparatus deviation of refuelling station; so usually can cause the friction between consumer and the refuelling station businessman, this also causes this class group refueling meter to apply on market.Study carefully the bigger reason of its measurement deviation mainly: because be that fluid is intermittently to pass through, so can't form evenly lasting pressure in the both sides of impeller or turbine, so in early stage that fluid passes through, later stage and under the less situation of fluid flow, the capital causes impeller or turbine rotation unusual, thereby produces error in dipping.

Summary of the invention

In order to solve above-mentioned technical matters, the purpose of this utility model provides a kind of apparatus for metering fluids, by guides being set in the impeller front, this guides has maximum meeting to area, can make any type of fluid effectively be rectified into the rotating fluid of direction unanimity, thereby make through the fluid formation rotating fluid impact wheel rotation of guides, avoided intermittently error in dipping of fluid by causing.

To achieve the above object, the utility model has adopted following technical scheme:

A kind of apparatus for metering fluids, comprise the overcurrent tube, be provided with rotating impeller in the described overcurrent tube, at least one blade of impeller is provided with magnet steel or iron staff or blade itself and has magnetic or magnetic conductivity, described overcurrent tube outside is provided with corresponding signal-count parts, the front of described impeller is provided with the guides that direct fluid is formed eddy flow, is provided with several spiral stream guidance blades in the guides.

Above-mentioned impeller the place ahead is provided with a guides.

As preferably, the number of above-mentioned impeller blade is identical with the number of guides inside spin guide vane.Each eddy flow outlet that can guarantee guides like this can both corresponding impeller blade, has improved rectification effect, reduces error in dipping.

Be provided with 4 spiral stream guidance blades that direct fluid formed 4 strands of eddy flows in the above-mentioned guides, described impeller is provided with and corresponding 4 blades of these four strands of eddy flows.Certainly, also the number of impeller blade can be designed to guides swirling number purpose integral multiple.

As preferably, above-mentioned impeller blade direction is axial.The impulsive force of eddy flow effectively can be converted into the rotation of impeller like this, because the impeller blade direction is axially, outlet does not have guides, and therefore reverse fluid can not cause the rotation of impeller, the error of having avoided fluid to flow backwards and cause.

In order to improve measuring accuracy, be equipped with magnet steel or iron staff or blade itself on each blade of above-mentioned impeller and have magnetic or magnetic conductivity.

As preferably, the impeller shaft support and connection of above-mentioned impeller are on overcurrent tube and guides.Be in order to reduce volume, to improve the rectification effect of guides like this.

The utility model is owing to adopted above technical scheme, in the impeller front guides is set, several spiral stream guidance blades (being generally 4) are arranged in the guides, because this structure has maximum meeting to area, therefore its rectification effect is far above traditional structure, can make any type of fluid effectively be rectified into the rotating fluid of direction unanimity, like this, make that the fluid of process guides all effectively is rectified into eddy flow impact impeller and makes its rotation, avoided intermittently error in dipping of fluid by causing, be applied on the portable heating oil measurement device, make the actual metered error control total volume read-out 1% in.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the A-A cut-open view of Fig. 1.

Fig. 3 is the B-B cut-open view of Fig. 1.

Fig. 4 is an explosive view of the present utility model.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is made a detailed explanation.

Embodiment 1:

As Fig. 1-a kind of apparatus for metering fluids shown in Figure 4, comprise overcurrent tube 1, be provided with rotating impeller 3 in the described overcurrent tube 1, impeller 3 has four blades, all is provided with a magnet steel 32 on each blade, and described overcurrent tube 1 outside is provided with corresponding signal-count parts (not drawing on the figure), the front of described impeller 3 is provided with the guides 2 that makes fluid form eddy flow, be provided with 4 spiral stream guidance blades 21 in the guides 2, wherein, described impeller 3 blade directions are axial; Described guides 2 is fixed on the inflow point of overcurrent tube 1, and the impeller shaft 31 of described impeller 3 is connected on overcurrent tube 1 and the guides 2 by bearings.

Claims

1. apparatus for metering fluids, comprise overcurrent tube (1), be provided with rotating impeller (3) in the described overcurrent tube (1), at least one blade of impeller (3) is provided with magnet steel or iron staff or blade itself and has magnetic or magnetic conductivity, described overcurrent tube (1) outside is provided with corresponding signal-count parts, it is characterized in that the front of described impeller (3) is provided with the guides (2) that direct fluid is formed eddy flow, be provided with several spiral stream guidance blades (21) in the guides (2).

2. a kind of apparatus for metering fluids according to claim 1 is characterized in that, described impeller (3) the place ahead is provided with a guides (2).

3. a kind of apparatus for metering fluids according to claim 1 is characterized in that, the number of described impeller (3) blade is identical with the number of guides (2) inside spin guide vane (21).

4. a kind of apparatus for metering fluids according to claim 2, it is characterized in that, be provided with 4 the spiral stream guidance blades (21) that direct fluid formed 4 strands of eddy flows in the described guides (2), described impeller (3) is provided with and corresponding 4 blades of these four strands of eddy flows.

5. a kind of apparatus for metering fluids according to claim 1 is characterized in that, described impeller (3) blade direction is axial.

6. according to each described a kind of apparatus for metering fluids in the claim 1 to 5, it is characterized in that, be equipped with magnet steel or iron staff or blade itself on each blade of described impeller (3) and have magnetic or magnetic conductivity.

7. a kind of apparatus for metering fluids according to claim 6 is characterized in that, impeller shaft (31) support and connection of described impeller (3) are on overcurrent tube (1) and guides (2).