CN201007660Y

CN201007660Y - Portable flowmeter

Info

Publication number: CN201007660Y
Application number: CNU2007200625111U
Authority: CN
Inventors: 杨志纯; 黄会雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-02-13
Filing date: 2007-02-13
Publication date: 2008-01-16
Anticipated expiration: 2017-02-13

Abstract

The utility model discloses a portable flow measuring instrument, which comprises a housing case, and a fluid flow-in tube, a funnel which is arranged on the upper portion of the fluid flow-in tube, an upper cover is arranged outside the funnel, and a leakage-proof sealing gasket is arranged in the upper cover. An inner cavity of the instrument formed by the housing case is divided into two small cavities by a baffle board, wherein one small cavity is provided with a bearing support and a turbine which is mounted on the bearing support. The inclination of turbine blades is 60 to 70 degrees, one end of the fluid flow-out tube also extends into the small cavity, and the length of the fluid flow-out tube is 3 to 5 times of the fluid flow-in tube. The wall of the other small cavity is provided with a viewfinder board, a front cover and a rear cover, a dry reed relay which is connected with a magnet-control switch is arranged in the small cavity, an electromagnetic converter, a monolithic control circuit and a liquid crystal display. The utility model is applied for the measurement of the liquid flow of a viscosity under 15*10-6M2/S and the accumulation measuring accuracy can achieve within the range between +0.5% and -0.5%. The instrument is small and exquisite, convenient in carrying, easy in operation, which is especially adaptable for oil measuring of automobile fuel.

Description

The portable flow gauge

Technical field

The utility model relates to a kind of flow measurement instrument, especially relates to a kind of portable turbine flow metering instrument.

Background technology

The turbine flow detection technique is used usually in big flow measurement environment, and continuous data is finished by mechanical component, and turbine is made with stainless steel material, and 2-6 sheet helical blade is housed, and blade tilt is 30 ℃-45 ℃., the fluid that guarantees to enter flow instrument distributes flow instrument is built-in rectifier for having even velocity.Based on the kinetic moment equilibrium principle, fluid is through turbine flow through rectifier and mozzle, makes fluid obtain rectification and quickens.Because turbo blade and direction of flow have a certain degree, under the effect of accelerating fluid, turbine begins to rotate, and in the certain flow scope, kinetic moment and moment of friction are during near balance, and the rotating speed of turbine is directly proportional with fluid volume flow.This turbine flow instrument is bigger in low discharge region measurement error.

The utility model content

The purpose of this utility model is to overcome existing turbine flow instrument in the bigger defective of low discharge region measurement error, provides a kind of at low discharge region measurement precision height, and simple in structure, the portable flow gauge that cost is lower.

The purpose of this utility model is achieved through the following technical solutions: comprising housing, the fluid inflow pipe, funnel is arranged at fluid flow ipe top, the funnel outside is provided with loam cake, the sealing gasket that the leakage of preventing is arranged in the loam cake, the instrument inner chamber that housing constitutes is divided into two loculuses by dividing plate, one of them loculus is equipped with bearing seat, turbine, turbine cartridge is on bearing seat, described turbo blade inclination angle (lead angle) is 60 °-70 ° (preferred 63 °-67 °, more preferably 64 °), and an end of described fluid effuser also stretches in this loculus; The length of described fluid effuser is 3-5 times (preferred 3.5-4.5 times, more preferably 4 times) of inflow pipe length, carries out rectification with convection cell, the resistance that reduces to flow out; On another loculus wall the form plate is housed, protecgulum, bonnet, the dry-reed relay that links to each other with magnetic switch is housed in the loculus, magnetoelastic transducer and single chip machine controlling circuit, LCD, described magnetoelastic transducer is made of coil and permanent-magnet steel, and the optimum position of its permanent-magnet steel and coil is as the criterion with the position of testing in oscillograph of waveform the most clearly.

Described single chip machine controlling circuit comprises single-chip microcomputer, reset circuit, oscillatory circuit, pulse bandwidth filtering shaping circuit, driving circuit, liquid crystal display circuit, power control circuit, described reset circuit, oscillatory circuit, liquid crystal display circuit and power control circuit directly are connected with single-chip microcomputer, the output terminal of described pulse bandwidth filtering shaping circuit is connected with the input end of driving circuit, and described driving circuit output terminal is connected with single-chip microcomputer; Described pulse bandwidth filtering shaping circuit is made of comparer.

For further reducing fluid resistance, described bearing seat adopts following structure: an end is a cone, and the other end is a bearing socket, and cone is enclosed within on the conduit of two ends; In order not influence the intensity of bearing seat, adopt fixing collar or/and rinforcement bar is reinforced.

The two ends inflow pipe of explosion-proof type structure, effuser are the cast aluminium pipe, and switch is the explosion-proof type switch, and components and parts are no-spark type electron device, and shell is made with flame retardant plastics.

Measured liquid flows into from inflow pipe, after passing loam cake and funnel, promote the magnetic line of force that turbine rotation cutting permanent-magnet steel produces, magnetic flux in the periodic variation coil makes the coil two ends induce the pulse signal that is directly proportional with fluid volume flow, and this signal is after comparer amplification, filtering, shaping, entering single-chip microcomputer handles, after single-chip microcomputer calculating, draw the flow of liquid, be sent to display and show data on flows.

Dry-reed relay is realized the break-make of power supply under the magnetic switch effect.

The utility model can be used for measuring the fluid flow of viscosity below 15 * 10-6M2/S, the measuring accuracy height, and the cumulative measurement precision of flow can reach ± and 0.5%; Instrument is small and exquisite, easy to carry, easy operating; Use the liquid crystal display integrated flow, clear and intuitive, convenient reading.The explosion-proof type structure, also have good explosion-proof function.The utility model is specially adapted to the fuel gauging of vehicle fuel.

Description of drawings

Fig. 1 (a) is the front view of the utility model one embodiment;

Fig. 1 (b) is an A-A cut-open view embodiment illustrated in fig. 1;

Fig. 2 (a) is the bearing seat enlarged front view of fixed turbine shown in Fig. 1 (b);

Fig. 2 (b) is the bearing seat enlarged left view of fixed turbine shown in Fig. 1 (b)

Fig. 2 (c) is the bearing seat amplification plan view of fixed turbine shown in Fig. 1 (b)

Fig. 3 is a control circuit block scheme embodiment illustrated in fig. 1;

Fig. 4 is a kind of realization circuit diagram of control circuit block scheme shown in Figure 2.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

With reference to Fig. 1, present embodiment comprises housing 12, fluid inflow pipe 1, and funnel 6 is arranged at fluid inflow pipe 1 top, funnel 6 outsides are provided with loam cake 2, the sealing gasket 3,4,5 that the leakage of preventing is arranged in the loam cake 2, the instrument inner chamber that housing 12 constitutes is divided into two loculuses by dividing plate, and one of them loculus is equipped with bearing seat 7, turbine 8, turbine 8 is contained in (bearing seat 7 engineering plastics manufacturing is to reduce production costs) on the bearing seat 7, and an end of fluid effuser 9 also stretches in this loculus; Another loculus is equipped with form plate 10, protecgulum 11, bonnet 13, dry-reed relay 14, magnetic switch 15, small washer 16, cross recessed pan head tapping screw 17 (being used for fixing bonnet), O type rubber seal 18; The length of described fluid effuser 9 is 4 times of inflow pipe 1 length, and turbine 8 blade tilts are 64 °, and impeller is four, casts with powder metallurgy precision to form (precision of the light more metering of quality is high more); LCD 20 is housed, magnetoelastic transducer and single chip machine controlling circuit in the form plate 10; Described magnetoelastic transducer is made of coil and permanent-magnet steel; The bonnet inboard is provided with battery cavities 19, for the usefulness of dress power supply (for example dry cell); The pipeline and the effuser 1 that flow into funnel are the cast aluminium pipe, and housing 12 usefulness flame retardant plastics are made; The position of permanent-magnet steel and coil is determined by the position of testing in the oscillograph of waveform the most clearly in the magnetoelastic transducer.

With reference to Fig. 2, described bearing seat 7 one ends are cone 21, and the other end is a bearing socket 24, and cone 21 is enclosed within on the conduit of two ends; For the resistance that reduces fluid does not as far as possible influence the intensity of bearing seat 7, bearing socket 24 is provided with fixing collar 22 and rinforcement bar 23 is reinforced.

With reference to Fig. 3, described single chip machine controlling circuit comprises single-chip microcomputer, reset circuit, oscillatory circuit, pulse bandwidth filtering shaping circuit, driving circuit, liquid crystal display circuit, power control circuit, described reset circuit, oscillatory circuit, liquid crystal display circuit and power control circuit directly are connected with single-chip microcomputer, the output terminal of described pulse bandwidth filtering shaping circuit is connected with the input end of driving circuit, and described driving circuit output terminal is connected with single-chip microcomputer; Described pulse bandwidth filtering shaping circuit is made of comparer.

With reference to Fig. 4, singlechip CPU adopts the AT89C2051 chip, and its ROM space is 2K, and RAM is 128 bytes, and frequency of operation is the 6M hertz; When turbine cuts the magnetic line of force of permanent-magnet steel, produce the pulse that is directly proportional with speed, after comparer U3 shaping, drive through reverser U2 again, send into the T1 pin of CPU.Displaying contents is by P _1.2And P _1.3Pin is according to I ₂C communication protocol is sent to LCDs.Display screen is that 6 characters show that its radix point can be determined automatically.In order to improve the interference free performance of product, hold and be connected to 104 leaded multilayer ceramic capacitor on the power supply and the ground of each chip.Power supply adopts No. 5 dry cell power supplies of 4 joints, and the complete machine power consumption can continuous working more than 250 hours about 4 milliamperes.

Present embodiment with ten thousand/ the gauging instrument test after, draw 5 and be raised in 10 liters the low discharge scope, measuring accuracy can reach about 0.5%.

Claims

1. portable flow gauge, comprise housing, the fluid inflow pipe, funnel is arranged at fluid inflow pipe top, there is loam cake the funnel outside, and the sealing gasket of the leakage of preventing is arranged in the loam cake, and the instrument inner chamber that housing constitutes is divided into two loculuses by dividing plate, one of them loculus is equipped with bearing seat, turbine, turbine cartridge are equipped with the form plate on another loculus wall on bearing seat, protecgulum, bonnet is equipped with the dry-reed relay that links to each other with magnetic switch in the loculus, magnetoelastic transducer and single chip machine controlling circuit, LCD, described magnetoelastic transducer is made of coil and permanent-magnet steel, and an end of described fluid effuser also stretches in this loculus, it is characterized in that, described turbo blade inclination angle is 60 °-70 °, and the length of described fluid effuser is 3-5 times of inflow pipe length;

2. portable flow gauge according to claim 1 is characterized in that, described turbo blade inclination angle is 63 °-67 °.

3. portable flow gauge according to claim 1 and 2 is characterized in that, the length of described fluid effuser is 3.5-4.5 times of inflow pipe length.

4. portable flow gauge according to claim 1 and 2 is characterized in that, described bearing seat one end is a cone, and the other end is a bearing socket, and cone is enclosed within on the conduit of two ends.

5. portable flow gauge according to claim 3 is characterized in that, described bearing seat one end is a cone, and the other end is a bearing socket, and cone is enclosed within on the conduit of two ends.

6. portable flow gauge according to claim 4 is characterized in that, described bearing socket is provided with fixing collar or/and rinforcement bar.