CN2286867Y

CN2286867Y - Flow measuring sensor

Info

Publication number: CN2286867Y
Application number: CN 96236427
Authority: CN
Inventors: 陈尧生
Original assignee: XiAn Institute of Optics and Precision Mechanics of CAS
Current assignee: XiAn Institute of Optics and Precision Mechanics of CAS
Priority date: 1996-11-15
Filing date: 1996-11-15
Publication date: 1998-07-29
Anticipated expiration: 2006-11-15

Abstract

The utility model discloses a flow measurement sensor, it is opened on an anterior segment perisporium has fluid import, and establish a metal rod in its rear portion is equipped with the tube-shape casing of sealed ripple shell fragment, the fixed hemisphere body speculum that is equipped with of its rear end, be equipped with self-focusing lens and a pair of luminotron on its focus point, connect photoelectric converter and circuit board behind the self-focusing lens, it belongs to photoelectric sensing technical field, it is good to have the leakproofness, the survey is accurate, wide use range, do not receive the advantage that ambient temperature influences, be applicable to and measure fluid flow, the flow that is particularly useful for oil well water injection layer and the survey of the great crude oil flow of coefficient.

Description

A kind of flow measurement sensor

The utility model belongs to a kind of architecture advances of measuring flow apparatus, is involved in the photoelectric sense technology field.

At present, the downhole flow of oil well is measured, the general employing with turbine-like blade or spiral blade as rotor, drive the magnet rotation and produce the magnetoelectricity signal that changes with rotating speed, measure its flow size, this determinator is because its rotor requires light and handy, make comparatively complicated, flexible in order to guarantee rotor, also need cause its cost to increase with the support of jewel bearing as rotor, importantly its sealing property be relatively poor, pollute easily, the time and rotating part is blocked, damage, and usable range is limited, big flow measurement or low discharge mensuration all are difficult to be competent at, also need to be subjected to encircling the restriction of mirror temperature in use, otherwise will cause the error that measured value is bigger.

The purpose of this utility model is to provide a kind of no rotor, good seal performance, and usable range is big, the flow measurement sensor that not rung by the photographic fixing of environment temperature.

Technical solution scheme of the present utility model is such: have fluid inlet on the perisporium of tubular shell leading portion, the housing front end is uncovered, at housing inner fluid import rear portion Packed ripple shell fragment is set, be divided into two cavitys in its tubular shell, front end is that fluid is through the chamber, the rear end is a closed chamber, in ripple shell fragment central authorities stationary installation front end being arranged is the metal bar of garden stage body, its tail end is inserted in the enclosed cavity, follower head fixedly is equipped with the hemisphere catoptron, the sphere of catoptron is carved with some concentric garden annular grooves, on focusing mirror point, be fixed with GRIN Lens, symmetry is equipped with a pair of luminotron on the inner walls of GRIN Lens both sides, is connected to the photoelectric commutator and the circuit board of stationary installation after the GRIN Lens.

Because the utility model adopts photoelectric sense technology, eliminated the rotating part of traditional flowmeter, place fluid by a metal bar, working fluid is obstructed at garden stage body place, produces eddy current and causes pressure reduction, cause the generation shake of metal bar, because the chattering frequency of metal bar and rate of flow of fluid are linear, according to f=svd, f is the pressure pulse frequency that eddy current causes, s is the Stroubal constant, v is a flow velocity, and d is the width of metal barred body, can learn from formula, as long as determine the pressure pulse frequency f, can obtain flow velocity v, the caliber with oil well multiplies each other again, just can obtain flow, if measure other fluids, multiply by its flow path and can draw its flow.Because inner metal bar and the welding of ripple shell fragment are fixed into one, its sealing is tight, and do not influence the flexible swing that is caused by pressure reduction, resolution of the present utility model is quite high, sensitivity reaches ± and the amount of movement of 1mm, and its measurement range is enlarged, no matter big flow, still low discharge can both be measured, its cost also reduces a lot, and is not influenced by ambient temperature during use, measure accurately, the life-span is long.

Below in conjunction with accompanying drawing embodiment of the present utility model is described further:

Fig. 1 is the structural representation of the designed sensor of the utility model.

Among the figure, 1 is housing, and 2 is metal bar, and 3 is the ripple shell fragment, and 4 is the hemisphere catoptron, and 5 is the led luminotron, and 6 is GRIN Lens, and 7 is photoelectric commutator, and 8 is circuit board.

The designed sensor of the utility model is to have fluid inlet on the perisporium of tubular shell leading portion, the housing front end is uncovered, at housing inner fluid import rear portion Packed ripple shell fragment 3 is set, be divided into two cavitys in its tubular shell, front end is that fluid is through the chamber, the rear end is a closed chamber, in ripple shell fragment 3 central stationary installations front end being arranged is the metal bar 2 of garden stage body, its tail end places in the enclosed cavity, metal bar 2 follower head stationary installations have the catoptron 4 of half sphere shape, be carved with some concentric garden annular grooves on the sphere of catoptron 4, on catoptron 4 focus points, be fixed with GRIN Lens 6, symmetry is equipped with a pair of led luminotron 5 on the inner walls of GRIN Lens 6 both sides, is connected to the photoelectric commutator 7 and the circuit board 8 of stationary installation after the GRIN Lens 6.

During making, make cylindrical case with stainless steel, and on the perisporium of front end, have fluid inlet, the housing front end is uncovered, the housing external diameter is generally φ 25-38mm, at housing inner fluid import rear portion Packed ripple shell fragment 3 is set, be divided into two cavitys in its tubular shell, front end is that fluid is through the chamber, the rear end is a closed chamber, bluff body made by metal bar and its front end is the garden stage body, its maximum gauge is decided by housing 1 internal diameter, general desirable φ 6-12mm gets final product, metal bar passes ripple shell fragment 3 central authorities and fixes with its welding, and tail end is inserted in the enclosed cavity, the half sphere shape catoptron is equipped with in the termination, be carved with several concentric ring grooves on the sphere of catoptron 4, the place is fixed with GRIN Lens 6 at the focusing mirror point, symmetry is equipped with a pair of led luminotron 5 on housing 1 inwall of GRIN Lens 6 both sides, be connected to the photoelectric commutator 7 and the circuit board 8 of stationary installation after the GRIN Lens, be respectively equipped with amplifying circuit on the circuit board, the linearity correction circuit, the simulation outlet line is joined by cable and Ground Processing System by housing at last.

During use, the utility model is inserted in the fluid of down-hole, opening power, at this moment, the generation eddy current caused pressure reduction after fluid entered in the housing from import, cause metal bar to produce shake, the shake of metal bar drives the mirror tilt of its termination again, because the chattering frequency and the fluid of metal bar are linear, simultaneously the led luminotron as the fixed light source direct irradiation on the hemisphere catoptron, at this moment the concentric garden groove of hemisphere mirror surface obviously changes after with a part of light absorption, to carry out opto-electronic conversion in the light pulse signal reception back input photoelectric commutator by self-focus lens, become and enter circuit board again behind the electric impulse signal and carry out a series of processing and amplifying, linearity correction, simulation output digital signal is delivered to Ground Processing System again and handles, obtain the determination data of fluid flow, photoelectric commutator described here and the amplifying circuit in the circuit board, the linearity correction circuit, the simulation outlet line all belongs to prior art, general technician can both realize this technology, therefore repeats no more.

The related parameter that has that the utility model is designed is primarily aimed in underground water-injection flow or oil flow, uses on ground as need, can suitably strengthen its physical dimension and get final product.The utility model can be under any environment temperature operate as normal, do not influence measurement effect.

Claims

1. flow measurement sensor, it is by housing (1), photoelectric commutator (7), circuit board (8) is formed, it is characterized in that, on the perisporium of tubular shell (1) leading portion, have fluid inlet, the housing front end is uncovered, at housing inner fluid import rear portion Packed ripple shell fragment (3) is set, be divided into two cavitys in its tubular shell, front end is that fluid is through the chamber, the rear end is a closed chamber, in the central stationary installation of ripple shell fragment (3) front end being arranged is the metal bar (2) of garden stage body, its tail end is inserted in the enclosed cavity, metal bar (2) follower head fixedly is equipped with the catoptron (4) of half sphere shape, be carved with some concentric garden annular grooves on the sphere of catoptron (4), on catoptron (4) focus point, be fixed with GRIN Lens (6), be arranged with a pair of luminotron (5) on the inner walls of GRIN Lens (6) both sides, be connected to the photoelectric commutator (7) and the circuit board (8) of stationary installation after the GRIN Lens (6).

2. sensor according to claim 1 is characterized in that, described metal bar (2) is a bluff body; Be respectively equipped with amplifying circuit, linearity correction circuit and simulation outlet line on the described circuit board (8).