CN117589250A - Electromagnetic flowmeter structure of low-power consumption - Google Patents

Abstract

The invention provides a low-power electromagnetic flowmeter structure, which includes a laminated I-shaped iron core and an excitation coil. The laminated I-shaped iron core adopts an I-shaped permalloy iron core as a whole. The I-shaped iron core is installed in a symmetrical form on the top and bottom of the special-shaped measuring pipe. The special-shaped measuring pipe has a gradient rectangular structure as a whole. The surface of the laminated I-shaped iron core is wound with an excitation coil, and the excitation coil is connected to the external Connected to the battery power supply circuit, this low-power electromagnetic flowmeter structure overcomes the shortcomings of the traditional excitation core structure's low magnetic permeability and magnetic induction intensity under low current, and effectively reduces the power consumption under external battery power supply conditions, ensuring In order to ensure the measurement accuracy, I-shaped permalloy laminations are used to make an integrated excitation core with a magnetic yoke. Compared with the iron core with traditional material structure, the magnetic permeability is dozens of times higher, which can effectively increase the intensity of the spatial magnetic field. Ensure uniform magnetic field characteristics in space.

Description

A low-power electromagnetic flowmeter structure

Technical field

The invention relates to the field of electromagnetic flowmeters, specifically a low-power consumption electromagnetic flowmeter structure.

Background technique

Magnetic flowmeter is a common flow detection device in daily life that detects acids, alkalis, salt solutions, water, sewage, corrosive liquids, mud, mineral pulp, paper pulp, etc. with conductivity ≥5 μs/cm. It uses Faraday's law of electromagnetic induction Make flow measurements.

The existing traditional sensor excitation core structure is generally a pair of circular excitation coils wound around a circular iron core made of soft iron, and then wound into a whole by several silicon steel sheets. The excitation core structure produced by this solution cannot form a uniform magnetic field, the magnetic permeability of soft iron and silicon steel is too low, the magnetic shielding effect is not obvious, and the magnetic field intensity generated when the low-power circuit is powered is compared with the magnetic field generated by the traditional power supply method. Strong strength is too low. Therefore, the excitation structure core produced in the prior art has obvious shortcomings. To achieve a reasonable induced electromotive force during the measurement process, the excitation current needs to be increased to achieve accurate measurement. However, the power consumption generated by this process is too high and the nonlinearity is serious.

Contents of the invention

In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a low-power electromagnetic flowmeter structure to solve the problems raised in the above background technology. The present invention solves the problem of electromagnetic flowmeter on the premise of satisfying the measurement accuracy of the electromagnetic flowmeter. It solves the problem of excessive power consumption of the flow meter while ensuring sufficient measurement accuracy.

In order to achieve the above objects, the present invention is realized through the following technical solutions: a low-power electromagnetic flowmeter structure, including an electromagnetic flowmeter structural body and a special-shaped measurement pipe. The electromagnetic flowmeter structural body includes a stacked type I-shaped iron core and excitation coil, the laminated I-shaped iron core adopts I-shaped permalloy iron core as a whole, and the laminated I-shaped iron core is installed in a symmetrical form on the top of the special-shaped measuring pipe and the bottom. The special-shaped measurement pipe has a gradient rectangular structure as a whole. An excitation coil is wound on the surface of the laminated I-shaped iron core, and the excitation coil is connected to an external battery power supply circuit.

Further, the laminated I-shaped iron core includes a plurality of permalloy laminations, and the surfaces of the permalloy laminations are provided with rivet fixing openings.

Furthermore, each permalloy lamination on the laminated I-shaped iron core is combined and fixed by rivets passing through the rivet fixing openings. The laminated I-shaped iron core is close to the special-shaped measuring pipe. The width of one end is the same as the diameter of the pipe under test.

Further, the laminated I-shaped iron core is provided with two groups of excitation coils, and the inner hole of each excitation coil is rectangular, and the two excitation coils are connected in series to form a whole.

Further, the excitation coil is wound at the middle position of the laminated I-shaped iron core, and the number of winding turns of a single coil in the excitation coil increases evenly and the total number of turns is not less than 350.

Further, the battery-powered circuit includes a power supply and low-voltage detection module, a keyboard and display module, a signal amplification processing module, a sampling module, an excitation module, and a data storage module.

Furthermore, the electromagnetic flowmeter structure also includes a micro-power consumption MCU integrated chip machine, which generates an excitation signal by controlling the H-bridge and loads it on the excitation coil to generate an alternating magnetic field.

Furthermore, the three-valued low-frequency rectangular wave excitation method is used in the process of generating the excitation signal.

Beneficial effects of the present invention:

1. This low-power electromagnetic flowmeter structure overcomes the shortcomings of the traditional excitation core structure in low magnetic permeability and magnetic induction intensity under low current, and effectively reduces the power consumption under external battery power supply conditions to ensure sufficient measurement. Accuracy.

2. The low-power electromagnetic flowmeter structure uses I-shaped permalloy laminations to make an integrated excitation core with a magnetic yoke. Compared with the iron core of traditional material structure, the magnetic permeability is dozens of times higher. Moreover, permalloy has low coercive force and high magnetic shielding effect. When combined with the excitation coil structure with a rectangular inner hole, it can effectively increase the spatial magnetic field intensity and ensure uniform spatial magnetic field characteristics.

Description of drawings

Figure 1 is a front view of the structure of a low-power electromagnetic flowmeter according to the present invention;

Figure 2 is a schematic cross-sectional view of the excitation coil of the present invention;

Figure 3 is a schematic diagram of the basic lamination of the I-shaped iron core of the present invention;

Figure 4 is a laminated diagram of the upper and lower thickness of the I-shaped iron core of the present invention;

In the picture: 1. laminated I-shaped iron core; 2. rivet fixing opening; 3. excitation coil; 4. special-shaped measuring pipe; 5. electrode.

Detailed ways

In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific implementation modes.

Please refer to Figures 1 to 4. The present invention provides a technical solution: a low-power electromagnetic flowmeter structure, including an electromagnetic flowmeter structural body and a special-shaped measurement pipe 4. The electromagnetic flowmeter structural body includes a stacked I-shaped The iron core 1 and the excitation coil 3 are made of I-shaped permalloy laminations to form an integrated laminated I-shaped iron core 1 with a magnetic yoke. The laminated I-shaped iron core 1 has rivets on it. A fixed circular opening, a laminated I-shaped iron core 1 is wound with an insulating excitation coil 3, and the insulating excitation coil 3 is symmetrically placed on the upper and lower sides of the special-shaped measuring pipe 4, and symmetrical electrodes are embedded on both sides of the special-shaped measuring pipe 4 5.

An integrated field core with a magnetic yoke is made from I-shaped permalloy laminations. Compared with the iron core with a traditional material structure, the magnetic permeability is dozens of times higher, and the permalloy has a lower coercive force. As well as a high magnetic shielding effect, combined with the excitation coil 3 structure with a rectangular inner hole, it can effectively increase the spatial magnetic field intensity and ensure uniform spatial magnetic field characteristics.

This embodiment provides a special-shaped measuring pipe 4. The special-shaped measuring pipe 4 is a rectangular measuring pipe with a height of 50 mm and a height of 30 mm. The bottom stack thickness of the I-shaped iron core is 50 mm, and the upward thickness is controlled between 5-10 mm. The length of the three parts of the I-shaped middle-wound insulated excitation coil is controlled between 20-25mm, and the stacking thickness is controlled between 10-15mm. The top shape of the I-shaped laminated iron core is controlled between the stacking thickness of 10-20mm, the rectangular length of the front view is controlled between 30-60mm, and the width is controlled between 10-30mm, as shown in Figure 4. The laminated I-shaped core 1 in this embodiment is made of permalloy material.

According to the above dimensions, use a machine to punch out several 1mm-thick permalloy laminates with a magnetic yoke, as shown in Figures 3 and 4. According to the size, use four Φ1mm iron rivets to pass through the multiple laminations in the attached figure. Rivets secure the opening 2 to form a strong integrated laminated iron core. Use a machine to wind the excitation coil 3 in the middle of the I-shaped iron core. In this embodiment, the inner diameter of the excitation coil 3 is 0.8mm. The upper and lower excitation coils 3 are connected in series with each other. The number of turns in each layer increases evenly and the control number is the same. The number of turns is not the same. Less than 350 turns, the inner hole is rectangular, and is wrapped with insulating cloth. The prepared iron core is symmetrically fixed on the upper and lower sides of the special-shaped measuring pipe 4.

The insulated excitation coil 3 is connected to an external battery power supply circuit, and the external battery power supply circuit includes a power supply and low voltage detection module, a keyboard and display module, a signal amplification processing module, a sampling module, an excitation module, a data storage module, etc., wherein , the power supply provides electrical energy to generate subsequent alternating magnetic fields; the circuit and monitoring process are controlled through the keyboard and display module and the data output is displayed; the signal amplification processing module and the sampling module amplify and collect the signals transmitted by the sensor, and through conversion The digital signal obtained is then transmitted to the data storage module to realize the storage of monitoring data.

In this embodiment, a micro-power MCU integrated chip is used to generate an excitation signal by controlling the H-bridge, and is loaded on the excitation coil 3 of the sensor to generate an alternating magnetic field. The analog signal generated by the sensor is amplified and sent to the high-precision A/ D converter, the digital signal converted by A/D is sent to the MCU for data processing, the instantaneous flow rate and accumulated flow rate are calculated, and the result data of the instantaneous flow rate and accumulated flow rate are stored and output for display. In the process of generating the excitation signal, a three-valued low-frequency rectangular wave excitation method is used, and a reasonable sampling period is selected so that the excitation current changes according to the rules of positive, zero, negative, zero, and positive, so that it can have zero-point stable characteristics. Finally, by setting the excitation and dormancy two stage to reduce the power consumption required by the system.

Through the above process, the electromagnetic flowmeter structure overcomes the shortcomings of the traditional excitation core structure's low magnetic permeability and magnetic induction intensity under low current, ensuring that the excitation coil 3 provides spatially uniform magnetic field characteristics, effectively reducing the risk of damage under external battery power supply conditions. power consumption to ensure measurement accuracy.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments without departing from the spirit or basics of the present invention. In the case of specific features, the present invention can be implemented in other specific forms. Therefore, the embodiments should be regarded as illustrative and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is therefore intended that all claims falling within the claims All changes within the meaning and scope of equivalent elements are included in the present invention. Any reference signs in the claims shall not be construed as limiting the claim in question.

In addition, it should be understood that although this specification is described in terms of implementations, not each implementation only contains an independent technical solution. This description of the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole. , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (8)

1. A low-power electromagnetic flowmeter structure, including an electromagnetic flowmeter structural body and a special-shaped measurement pipe (4), characterized in that: the electromagnetic flowmeter structural body includes a laminated I-shaped iron core (1) and excitation coil (3). The laminated I-shaped iron core (1) adopts an I-shaped permalloy iron core as a whole. The laminated I-shaped iron core (1) is installed in a symmetrical manner. and The excitation coil (3) is connected to an external battery power supply circuit. 2. A low-power electromagnetic flowmeter structure according to claim 1, characterized in that: the laminated I-shaped iron core (1) includes a plurality of permalloy laminations, and the permalloy The surface of the laminate is provided with rivet fixing openings (2), and electrodes (5) are installed on the sides of the special-shaped measurement pipe (4) in a symmetrical manner. 3. A low-power electromagnetic flowmeter structure according to claim 2, characterized in that: each permalloy lamination on the laminated I-shaped iron core (1) is penetrated by rivets. After passing through the rivet-fixed opening (2), it is assembled and fixed. The width of one end of the laminated I-shaped iron core (1) close to the special-shaped measuring pipe (4) is the same as the diameter of the pipe to be measured. 4. A low-power electromagnetic flowmeter structure according to claim 1, characterized in that: the laminated I-shaped iron core (1) is provided with two groups of excitation coils (3), and The inner hole of each excitation coil (3) is rectangular, and the two excitation coils (3) are connected in series to form a whole. 5. A low-power electromagnetic flowmeter structure according to claim 4, characterized in that: the excitation coil (3) is wound at the middle position of the laminated I-shaped iron core (1), The number of winding turns of a single coil in the excitation coil (3) increases evenly and the total number of turns is not less than 350. 6. A low-power electromagnetic flowmeter structure according to claim 1, characterized in that: the battery power supply circuit includes a power supply and a low voltage detection module, a keyboard and a display module, a signal amplification processing module, a sampling module, and an excitation module. , data storage module. 7. A low-power electromagnetic flowmeter structure according to claim 6, characterized in that: the electromagnetic flowmeter structure further includes a micro-power consumption MCU integrated chip machine, and the micro-power consumption MCU integrated chip machine passes The H-bridge is controlled to generate an excitation signal which is loaded on the excitation coil (3) to produce an alternating magnetic field. 8. A low-power electromagnetic flowmeter structure according to claim 7, characterized in that a three-valued low-frequency rectangular wave excitation method is used in the process of generating the excitation signal.