CN100424473C - Amorphous alloy flow sensor - Google Patents

Abstract

The invention relates to an amorphous alloy flow sensor, which comprises a sleeve and a sleeve cover above it, a sensing probe, a housing, a front diversion bracket, a rear diversion bracket, a rotor and a bearing, and the sensing probe is sealed in the sleeve and the sleeve cover above it, the sleeve and the sleeve cover are fixed above the shell; the shell is a circular hollow pipe, and its two ends are respectively equipped with a front guide bracket and a rear guide bracket, and the front guide The bracket and the rear deflector bracket are provided with a pit for installing the bearing of the rotor; the sensing probe is composed of a coil, an amorphous iron core, and a permanent magnet. The coil is wound on the outer circumference of the amorphous iron core in a spiral manner, and the permanent magnet Placed above the amorphous core and coil. The invention can not only detect the weak signal very sensitively, but also the signal waveform is relatively stable and simple, can process the signal conveniently, and directly display the measured flow through the designed circuit or connect it with a microcomputer. Take control.

Description

Amorphous alloy flow sensor

technical field

The invention relates to the field of sensing, magnetoelectricity and signal processing for measuring fluid velocity and flow, in particular to an amorphous alloy flow sensor.

Background technique

The accurate measurement and monitoring of industrial fluid has always been concerned by people, so there are many kinds of flowmeters on the market. They use different methods to achieve measurement, and they can be directly measured by mechanical methods. Yes, there are physical methods to measure, and some use chemical or optical methods to achieve measurement, but no matter what method is used to achieve measurement, the field of application is limited due to the characteristics of the method itself; in addition, industrial There are also many types of fluids, including gas, liquid, liquid-solid mixture, liquid-gas mixture, and even multiphase flow mixed with multiple phases, so there is no such thing at present, and it will be difficult to find a general-purpose fluid in the future. Flow measurement equipment for all occasions. Most of the rotameters used in the market, especially in the domestic market, are rotameters. On the one hand, this kind of flowmeter is completely mechanical, and cannot be connected with a computer, and cannot directly display the flow value; on the other hand, In recent years, there have been many direct digital electronic displays in China, but compared with similar foreign products, they all have shortcomings such as short lifespan, poor numerical stability, and low precision or sensitivity.

Contents of the invention

The purpose of the present invention is to provide an amorphous alloy flow sensor for the defects of the existing flowmeters such as short service life and low sensitivity. On the basis of the original mechanical structure, using the sensing probe of the present invention can not only Sensitively measure the weak signal, and the signal waveform is relatively stable and simple, and the signal can be processed conveniently, and the measured flow can be directly controlled by the digital display through the designed circuit or connected with the microcomputer.

The amorphous alloy flow sensor of the present invention comprises a sleeve and a sleeve cover above it, a sensing probe, a housing, a front diversion bracket, a rear diversion bracket, a rotor and a bearing, and the structures of each part are as follows: the sensing probe Sealed in the sleeve and the sleeve cover above it, the sleeve and the sleeve cover are fixed above the shell; the shell is a circular hollow pipe, and its two ends are respectively equipped with a front guide bracket and a rear guide bracket , the front deflector bracket and the rear deflector bracket are provided with recesses for installing rotor bearings.

The sleeve and the sleeve cover are cylindrical and can be tightly sealed with screws.

The signal output line of the sensor probe can be drawn out from the small hole on the sleeve cover;

The sleeve and the sleeve cover can be fixed on the upper middle of the housing in a threaded manner;

There is a step on the left end of the shell for fixing the front deflector bracket, and a thread on the right end to cooperate with the fixing bolt to lock the rear deflector bracket.

The front deflector bracket and the rear deflector bracket can be tripod brackets, and the parts in contact with the fluid face to face are transitioned in a circular arc, and the inner sides of the brackets are all provided with pits for placing bearings, and their sizes match the selected bearings.

The bearing is an angular contact instrument bearing made of stainless steel, and an interference fit is used between the bearing and the bracket.

The rotor can be made into different shapes according to the specific application and sensitivity requirements, such as T-shaped, straight, and spiral; at the same time, it can be made magnetic or non-magnetic according to the application and the structure of the probe. Yes, in some cases direct magnets can be built into the blades.

The rotor blade is a helical blade structure, and the overlap between the blades is 1.1-1.2. The rotor is supported and fixed by the left and right bearings, and the rotor and the bearing adopt interference fit.

The parts inside the shell are installed one by one from right to left, and finally fixed and locked by the bolt on the right end.

The sensing probe is composed of a coil, an amorphous iron core, and a permanent magnet. The coil is wound on the outer circumference of the amorphous iron core in a spiral manner, and the permanent magnet is placed above the amorphous iron core and the coil. Finally, the whole body is sealed tightly with wax. , to prevent damage.

The permanent magnet adopts NdFeB strong magnetism, which is oblate;

The amorphous iron core is made of superimposed layers of iron-based amorphous soft Ci alloy after microcrystallization treatment, and the overall shape is a small cuboid;

The coil is a thin copper wire of 1.1mm, and the number of turns can range from hundreds to thousands of turns according to the design requirements.

The pipes, rotors, bearings, and brackets formed inside the casing are in direct contact with the measured fluid, and the fluid flows through the pipes at a certain speed. It mainly supports and positions the rotor in the middle, and at the same time guides and directs the fluid to a certain extent, allowing the fluid to flow through the rotor better.

Through the diversion of the bracket and the pipe, the fluid flows through the rotor, and the rotor rotates under force;

The speed of rotor blade rotation and the flow of fluid conform to the following relationship: n=K(Q-q)

In the formula, n is the rotation speed of the blade, K is the instrument coefficient, Q is the actual fluid flow rate, and q is the starting flow rate.

There is a sensor probe made of amorphous material above the rotor, because the characteristics of the amorphous material determine that it has good magnetic permeability, and a certain number of coils are wound on the outside of the amorphous material, and the rotor below the When moving, it will interfere with the magnetic field in the probe. Due to the interference, the probe will induce a certain waveform signal with the rotation of the rotor. This signal can truly reflect the rotation of the rotor, that is, the flow of the fluid. Condition.

Several important features of this sensor probe are sensitive and passive, that is, no external power supply is required to directly sense the signal, and the signal is filtered, amplified, re-filtered, shaped, digital-analog Conversion, and then the obtained digital signal is recorded, processed and calculated through the chip, and through the display system, the result calculated by the sensor is finally displayed in digital form to the user for reading. At the same time, the signal can also be transmitted through the data interface. The direct input microcomputer is directly connected with the computer, and the signal is processed and calculated in the computer. In addition, it can be redeveloped according to actual needs, that is, according to the calculation and processing results, by means of comparison or setting, and vice versa. Real-time automatic control of fluid flow.

Compared with the prior art, the present invention has the following advantages: the structure is relatively simple, the sensitivity of the measurement is high, the sensing probe is passive, no external power supply is needed, the signal can be automatically induced, and the measured results can be directly read, and at the same time The device can be re-developed according to specific application occasions, and the fluid can be monitored in real time; in addition, the sensed signal can be directly input into the microcomputer, and a comprehensive system can be formed by cooperating with other devices.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of the sensor probe in Fig. 1;

Fig. 3 is a schematic circuit diagram of signal processing and result display connected to the signal output line of the sensor probe in the device of Fig. 1 .

Detailed ways

In Fig. 1, the sensor probe 1 is sealed in the sleeve and the sleeve cover 7 above it, and the sleeve and the sleeve cover 7 are fixed above the housing 2; the housing 2 is a circular hollow pipe, and its two The front guide bracket 4 and the rear guide bracket 3 are respectively installed at the ends, and the front guide bracket 4 and the rear guide bracket 3 are provided with pits for installing the bearing 5 of the rotor 6 .

The rear deflector bracket 3 and the front deflector bracket 4 mainly play a guiding role and support the blades. They are all made of non-magnetic materials. The fluid flows from the front bracket to the rear bracket. If the front and rear brackets are made symmetrical, it can be There is no need to consider the direction; the angular contact bearing 5 and the rotor blade 6 are the main force-bearing parts. According to the actual situation and the requirements of precision sensitivity, its shape can be made into a spiral or T-shaped shape, and its material can also be used according to the structure of the probe. It can be made of better magnetically permeable materials, or it can be made of non-magnetically permeable materials.

In Fig. 2, the sensing probe is composed of a coil 1-2, an amorphous iron core, and a permanent magnet 1-1, and the coil 1-2 is wound on the outer circumference of the amorphous iron core 1-3 in a spiral manner, a , b are the two ends of the coil, the permanent magnet 1-1 is placed above the amorphous iron core 1-3 and the coil 1-2, and finally the whole is sealed tightly with wax to prevent damage.

The permanent magnet adopts NdFeB strong magnetism, because this kind of material has a high magnetic field strength, so the volume can be small, but if the magnet is placed on the blade, the permanent magnet can be removed; the smaller the diameter of the coil 1-2 The better the better, the more turns nine can be wound under the same volume, the stronger the signal will be; the material used for the amorphous iron core 1-3 is an amorphous nanocrystalline soft magnetic material with very good magnetic permeability. It can be in the form of a rod or in the form of multi-layer sheets.

In Fig. 3, the signal processing part circuit 8 amplifies, filters and shapes the signal from the sensor probe, and outputs a square wave digital signal; the cup calculation circuit 9 realizes frequency recording, conversion between flow rates and transmission of display data; the display part Circuit 10 shows the result.

Claims (5)

1. amorphous alloy flow sensor, it is characterized in that comprising socket cover, sensing probe, housing, preceding water conservancy diversion support, back water conservancy diversion support, rotor and the bearing of sleeve and top thereof, sensing probe is sealed in the socket cover of sleeve and top thereof, and sleeve and socket cover are fixed in the top of housing; Housing is a circular hollow pipeline, and its two ends are separately installed with preceding water conservancy diversion support, back water conservancy diversion support, and preceding water conservancy diversion support and back water conservancy diversion support are provided with the pit of the bearing that rotor is installed; Described sensing probe is made of coil, amorphous iron core, permanent magnet, and on the amorphous iron core excircle, permanent magnet places amorphous iron core and coil top to coil in the mode of spiral; Before water conservancy diversion support and back water conservancy diversion support be three-legged support, the part that they head-on contacts with fluid is all with arc transition, the support inboard all has the pit that is used to lay bearing, its big or small and selected bearing mates.

2. amorphous alloy flow sensor according to claim 1 is characterized in that rotor is T-shaped, straight plate shape or spirality.

3. amorphous alloy flow sensor according to claim 2 is characterized in that spinner blade is a screw type blade construction, and its interlobate registration is 1.1-1.2, and rotor is supported by left and right sides two bearings and be fixing, adopts interference fit between rotor and bearing.

4. amorphous alloy flow sensor according to claim 3 is characterized in that described permanent magnet is to be the strong magnetic of oblate neodymium iron boron.

5. amorphous alloy flow sensor according to claim 4 is characterized in that described amorphous iron core is by the Fe-based amorphous soft Ci alloy rectangular parallelepiped that synusia is formed by stacking after micritization is handled.

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