Today, I will introduce a national invention authorized patent - valve and electromagnetic flowmeter integrated device and its application. The patent was applied for by Hangzhou Yungu Technology Co., Ltd. and the authorization announcement was obtained on August 31, 2016.
Content descriptionThe valve and electromagnetic flowmeter integrated device of the present invention relates to the field of electromagnetic flowmeters, in particular to the field of flow measurement and flow control that require battery power, such as heat metering, water metering, and sewage metering.
Background of the InventionElectromagnetic flowmeter is a flow measuring instrument based on Faraday's electromagnetic induction principle. It is proportional to the flow rate of the fluid, so as to obtain the flow rate of the fluid, and then obtain the flow rate of the fluid. In order to generate a magnetic field, an excitation coil is installed around the measuring tube, and the generated magnetic field passes through the fluid, thereby generating an induced potential in the fluid, and installing electrodes at the positive and negative positions of the induced potential can measure the magnitude of the induced potential. Electromagnetic flowmeters are widely used in flow measurement, and have the advantages of high measurement accuracy, good linearity, no structural parts in the measurement tube, and anti-pollution.
The valve is a device used to control the flow rate of the fluid. In the prior art electromagnetic flowmeters and electromagnetic flowmeters with valves, usually, the excitation coil is installed around the measuring tube, usually the two coils are installed relative to each other, or A coil and a magnetic core are installed relative to each other, and the magnetic field passes through the entire measuring tube. The larger the diameter, the longer the magnetic circuit and the greater the excitation power. It cannot meet the low power consumption applications such as battery power supply, especially the application of heat meters. . In the prior art, there is also a method of reducing the diameter of the measuring tube, shortening the magnetic circuit, and reducing the excitation power consumption. This method leads to a large pressure loss of the measuring tube and is not suitable for the application of heat meters.
In the prior art flowmeter with valve, the valve and the flowmeter are generally separated. With the development of urban central heating heat metering, the invention of a low-power excitation electromagnetic heat meter with a valve to solve the battery power supply problem of the electromagnetic heat meter with a valve is becoming more and more important in heat supply metering. In the prior art, there is no method for adding a magnetic conducting plate in the measuring tube, thereby reducing the excitation power and realizing the integration of the valve and the electromagnetic flowmeter.
SUMMARY OF THE INVENTIONThe purpose of the present invention is to provide a valve and electromagnetic flowmeter integrated device and its application, to solve the problem of high power consumption of the electromagnetic flowmeter with valve in the prior art, especially to solve the electromagnetic household heat meter and household water meter battery power issue.
The invention is specifically an integrated device of a valve and an electromagnetic flowmeter. The device includes a valve body, a valve core and a valve cover; the valve body and the valve cover form a cavity with a top and a horizontal opening, and the valve core is located in the cavity; the valve body It includes a measuring tube and a coil, and the coil is located below the valve core; the valve core is provided with a horizontal through hole connecting the horizontal opening of the measuring tube, and includes a magnetic conducting plate, a first electrode and a second electrode, and the horizontal through hole of the valve core is divided by the magnetic conducting plate. They are the upper through hole and the lower through hole, and the first electrode and the second electrode are respectively located on the left and right sides of the lower through hole. The valve body is provided with a magnetic core, the magnetic core is located inside the coil, and the magnetic core is a magnetic conductor. The valve body is provided with a U-shaped steel sleeve, the coil is located in the U-shaped cavity of the U-shaped steel sleeve, the U-shaped steel sleeve is a magnetic conductor, the valve body includes a skeleton, and the coil is wound in the I-shaped groove of the skeleton. The valve core further includes a first lead, a second lead, and a circuit board, the first electrode is connected to the circuit board through the first lead, and the second electrode is connected to the circuit board through the second lead, and is located in the middle and lower position of the lower through hole, The first lead and the second lead are made of conductive plastic material.
The valve and electromagnetic flowmeter integrated device of the present invention is used for a balance heat meter, a cooling meter and a water meter with a valve. The invention provides the arrangement of the valve and the electromagnetic flowmeter integrated device. The electrodes and lead parts of the electromagnetic flowmeter are built into the valve core, so that the valve core and the electromagnetic flowmeter sensing part are integrated and the volume is reduced.
In one aspect, the present invention provides a method for enhancing the magnetic field strength at an electrode location, thereby improving the magnetic field distribution efficiency. In the prior art, coils are arranged above and below the measuring tube, electrodes are arranged on both sides, and the excitation magnetic field generated by the coils passes through the entire fluid section, thereby reducing the magnetic field distribution efficiency. In the present invention, a magnetic conductive plate is added to the through hole of the valve core, the through hole of the valve core is divided into an upper through hole and a lower through hole, the magnetic field is distributed in the lower through hole with the measuring electrode, and the upper through hole is almost not A magnetic field is distributed, thereby improving the distribution efficiency of the excitation magnetic field.
In another aspect, the present invention provides an electromagnetic flow sensor arrangement method with low pipeline pressure loss. In the prior art, in order to achieve the necessary excitation power, the diameter of the measuring tube is reduced to a certain ratio, which increases the pressure loss of the pipeline. The magnetic field in the measuring tube of the present invention is distributed in the lower through hole, and the cross-sectional area of ​​the upper through hole basically does not affect the distribution of the magnetic field, so that the diameter of the pipeline does not need to be reduced.
In addition, the present invention also provides a low power consumption excitation arrangement method for measuring tubes with different diameters. In the prior art, coils are arranged above and below the measuring tube, and electrodes are arranged on both sides. The larger the diameter of the measuring tube, the larger the coil, and the greater the excitation power. The invention divides the through hole of the valve core into an upper through hole and a lower through hole, the excitation magnetic field only acts on the lower through hole, and the cross-sectional area of ​​the upper through hole can change with the diameter of the measuring tube, thereby adapting to measuring tubes of different diameters. The excitation coil does not change with the diameter of the measuring tube, providing a low-power excitation method.
Compared with the prior art, the invention has the following advantages: the valve core and the measuring tube have an integrated structure, and the volume is small; the distribution efficiency of the exciting magnetic field is high; the pipeline pressure loss of the measuring tube is small; the measuring tubes of different diameters all realize low power consumption Excitation excitation.
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