CN2446498Y

CN2446498Y - Vane swirl generating body

Info

Publication number: CN2446498Y
Application number: CN 00206493
Authority: CN
Inventors: 房兆俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-03-17
Filing date: 2000-03-17
Publication date: 2001-09-05
Anticipated expiration: 2010-03-17

Abstract

The utility model relates to a vane swirl generating body, which is characterized in that the vanes 7 of the generating body 1 are in an arched and spiral shape, and the flow direction at an inlet of the generating body is tangential with a vane port 9 at the inlet of a passage of the generating body. A normal line 11 in the passage 10 between the vanes of the generating body is gradually shortened from the inlet 8 of the passage to an outlet 12 of the passage to form a spiral venturi passage 10. Liquid is first tangential with the vanes at the inlet when flowing, and thus the liquid can be led in without block at the beginning. Then, the flowing speed of the liquid is gradually accelerated with the screwed spiral venturi passage 10, and thus the aim of obviously reducing pressure and energy loss is obtained. The stability and the interference immunity of measuring signals are enhanced.

Description

Blade vortex generation body

The utility model is a kind of signal generator that is used for swirl flowmeter, particularly a kind of blade vortex generation body.

Swirl flowmeter is used for the principle of meter fluid for (as shown in Figure 1): when fluid flows to flowmeter earlier when pipeline axial enters sensor, under the effect of vortex generation body, be forced to around the center rotation, produce eddy current, vortex is precession in Venturi tube, after arriving the contraction section throttling, vortex is quickened, the vortex core forms the spiral precession along a cone, vortex diffusion rectification again at last, this moment at vortex generation body to certain a bit forms the precession pulse between the straightening vanes, this frequency is directly proportional with flow rate of fluid, place the precession pulsed frequency that piezoelectric sensor detects vortex at this point, this frequency signal through flow integrator amplify and calculation process after convert that flow value shows on the spot or signal turns round to.This kind flowmeter biggest advantage is: simple in structure, measured value range is wide, and moderate accuracy is reliable and stable, and Installation Technology is less demanding, does not have mechanical movable piece, so long service life is keeped in repair also very convenient.But it is big that its disadvantage is a pressure loss, and when particularly detecting big flow, energy consumption is bigger, more can not adopt the occasion of paying attention to energy.Therefore flowmeter authoritative institution and flow authoritative sources will not approve this kind flowmeter both at home and abroad at present.This will produce the possibility that swirl flowmeter will be eliminated and use.

Causing the big main cause of swirl flowmeter pressure loss is the structure of vortex generation body.1. as the blade of old-fashioned vortex generation body be equidistantly spiral (as Fig. 2, shown in Figure 3), blade path porch flow axis is not tangent to the vortex blade that flows to the porch, when fluid flows into, vortex blade at first directly block fluid flow is gone into, produce spiral then, fluid flows into back progressively loss of flow velocity energy in interlobate equidistant spiral channel, and pressure obviously increases, and pressure loss is more obvious during particularly big flow.2. a kind of vortex generation body is arranged in the market, its vortex blade be dull and stereotyped linear (as Fig. 4, shown in Figure 5).Though its vortex blade construction improves to some extent, though resistance has minimizing when being the fluid inflow, but the flow axis of its porch becomes X-shape to flowing to blade, also there is certain pressure loss, its measuring-signal stability and anti-interference are relatively poor in addition, be used for liquid flowmeter so can only adapt to, and be not suitable for gas meter.

The purpose of this utility model is the shortcoming that exists at prior art and a kind of big problem of pressure loss that swirl flowmeter exists that can not only overcome is provided, and can also improve the stability of flowmeter pulse signal and blade vortex generation body that anti-interference is used for swirl flowmeter.

Technical solution of the present utility model is: the blade in the vortex generation body is the arc spirality, and blade path porch flow axis is tangent to the vortex blade port that flows to the feeder connection place; Interlobate passage is progressively dwindled by feeder connection to channel outlet, forms spiral venturi passage.

The utility model compared with prior art not only has the simple in structure of former swirl flowmeter, measured value range is wide, installation and maintenance are convenient, advantages such as long service life, and because arc spiral vane structure Design, make that the flow axis that body feeder connection place takes place is tangent to the blade port that flows to the feeder connection place, when flow axis at first tangent when flowing into the blade at feeder connection place, when therefore fluid flows into almost is unobstructed introducing, fluid is along with the spiral venturi passage precession of progressively dwindling between blade then, make fluid flow velocity in this passage progressively quicken, spray at last and have higher-pressure region and the clearly demarcated fluid double-screw bolt shape of low-pressure area, this moment piezoelectric sensor to obtain be stable precession pulse signal, thereby reach the purpose of obvious reduction pressure energy loss, and improved the stability and the anti-interference of measuring-signal.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is the swirl flowmeter schematic diagram.

Fig. 2 is the front view of a kind of vortex generation body the earliest of the prior art.

Fig. 3 is the left view of Fig. 1.

Fig. 4 is the front view of another kind of vortex generation body of the prior art.

Fig. 5 is the blade synoptic diagram in Fig. 4 generation body.

Fig. 6 is the front view of the utility model blade vortex generation body.

Fig. 7 is the left view of Fig. 6.

Fig. 8 is the synoptic diagram of the utility model generation body blade.

Among the figure: 1, vortex generation body; 2, housing; 3, spiral fashion fluid; 4, piezoelectric sensor; 5, flow integrator; 6, rectification body; 7, blade; 8, feeder connection; 9, blade port; 10, passage between blade; 11, passage normal direction line; 12, channel outlet.

Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 describe in detail in above-mentioned prior art, just no longer repeat at this.

As Fig. 6, Fig. 7 and shown in Figure 8, the blade 7 of the utility model blade vortex generation body 1 is the arc spirality, and feeder connection 8 flow axis are tangent to flowing between blade port 9 and the blade, path 10 between the blade 7 is progressively dwindled by feeder connection 8 to channel outlet 12, both the normal direction line 11 of the path 10 between the blade 7 was progressively shortened by feeder connection 8 to channel outlet 12, thereby made the path 10 between the blade 7 that body takes place form spiral venturi passage.

Claims

A kind of blade vortex generation body, the blade (7) that it is characterized in that taking place body (1) is the arc spirality, and the flow axis of feeder connection (8) is tangent to flowing to blade port (9) between the blade (7), passage (10) between the blade (7) is progressively dwindled by feeder connection (8) to channel outlet (12), forms spiral venturi passage (10).