Built-in pressure tapping structure of plug-in electromagnetic flowmeter

Abstract

The utility model discloses a built-in pressure tapping structure of a plug-in electromagnetic flowmeter, and relates to the technical field of flowmeters. The device comprises an insertion rod, the insertion rod comprises a converter, a straight rod, a pressure measuring mechanism and a flow measuring sensor which are sequentially connected from top to bottom, the pressure measuring mechanism comprises a pressure sensor base, and a pressure tapping hole is formed in one side of the pressure sensor base; a pressure sensor is fixedly arranged in the pressure sensor base, and the bottom of the pressure sensor is communicated with the pressure tapping hole. The internal pressure of the pipeline is transmitted to the diaphragm at the bottom of the pressure sensor through the pressure tapping hole, the diaphragm senses the change of the pressure, and the pressure sensor converts the sensed pressure into an electric signal and transmits the electric signal to the converter, so that the pressure value is tested, the structure is compact, the installation is convenient, and the pressure measurement precision is high.

Description

Technical Field

[0001] The present application relates to the technical field of flowmeters, and in particular to a built-in pressure-taking structure of an insertable electromagnetic flowmeter. Background Art

[0002] Insertion electromagnetic flowmeters operate based on Faraday's law of electromagnetic induction. In an electromagnetic flowmeter, the conductive medium within the measuring tube acts like the conductive metal rod in Faraday's experiment. Two electromagnetic coils at the lower ends generate a constant magnetic field. When the conductive medium flows through, an induced voltage is generated. Two electrodes in the pipe measure this induced voltage. Insertion electromagnetic flowmeters are widely used in the water supply industry due to their ease of installation and ability to maintain continuous flow.

[0003] When installing an insertion flowmeter, first drill a hole in the pipe, then insert the insertion rod into the pipe. During installation, the flow direction mark of the probe should be consistent with the actual flow direction. The flange surface should be parallel to the center line of the pipe, and the center line connecting the front and rear screw holes on the flange should be consistent with the center line of the pipe to ensure that the direction of the sensor probe is perpendicular to the flow direction. The depth of the probe inserted into the pipe should be 1 / 8 or 1 / 2 of the inner diameter of the pipe.

[0004] Electromagnetic flowmeters are a common flow measurement instrument for measuring water flow rate. Common insertion-type electromagnetic flowmeters lack integrated pressure measurement capabilities or mount the pressure sensor outside the pipe. This results in inaccurate pressure measurements due to the small clearance between the insertion rod and the opening in the pipe. Furthermore, since the pressure measurement mechanism is mounted outside the pipe, it is easily damaged and has a high failure rate. Utility Model Content

[0005] The purpose of this application is to solve the problems of inaccurate pressure measurement due to the small pressure guide space and the presence of bubbles in the existing integrated pressure measurement structure of the insertion flowmeter, as well as the external pressure measurement mechanism being easily damaged. This application provides a built-in pressure measurement structure for the insertion electromagnetic flowmeter.

[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0007] The insertion-type electromagnetic flowmeter has a built-in pressure-taking structure, including an insertion rod, which includes a converter, a straight rod, a pressure measuring mechanism, and a flow measurement sensor connected in sequence from top to bottom. The top of the straight rod extends out of the pipeline and passes through the valve to connect to the converter.

[0008] The pressure measuring mechanism includes a pressure sensor base, the top of the pressure sensor base is connected to the bottom of the straight rod, the bottom of the pressure sensor base is fixedly connected to the top of the flow measurement sensor, a pressure taking hole is opened on one side of the pressure sensor base, a pressure sensor is fixedly arranged inside the pressure sensor base, and the bottom of the pressure sensor is connected to the pressure taking hole.

[0009] By adopting the above technical solution, when it is necessary to measure the internal pressure of the pipeline, the straight rod is first inserted into the pipeline. The internal pressure of the pipeline is transmitted to the diaphragm at the bottom of the pressure sensor through the pressure taking hole. The diaphragm senses the change in pressure. At the same time, the pressure sensor converts the sensed pressure into an electrical signal and transmits it to the converter, thereby testing the pressure value. It has a compact structure, is easy to install, and has high pressure measurement accuracy.

[0010] Furthermore, the pressure sensor is installed inside the pressure sensor base, which reduces the possibility of the pressure sensor colliding with external objects, thereby reducing the occurrence of malfunctions of the pressure sensor caused by collision.

[0011] Furthermore, a cavity is provided in the middle of the pressure sensor base, the pressure sensor is fixedly installed in the cavity, the pressure taking hole is connected to the bottom of the cavity, a buffer gasket is provided at the bottom of the cavity, and the buffer gasket is placed at the bottom of the pressure sensor.

[0012] By adopting the above technical solution, the pressure sensor is installed in the cavity, and there is a gap between the buffer gasket and the bottom of the pressure sensor to ensure that the pressure sensor is suspended. The buffer gasket provides a buffer for the pressure sensor to block instantaneous pressure and avoid damage to the pressure sensor.

[0013] Furthermore, a fixing plate is provided at the top of the cavity, a fixing bolt is provided at the bottom of the straight rod, the fixing bolt is threadedly connected to the fixing plate, and the fixing plate is abutted against the top of the pressure sensor.

[0014] By adopting the above technical solution, the threaded bolt and the fixing plate cooperate with each other, the fixing bolt passes through the pressure sensor base to reach the cavity, and is then threadedly connected to the fixing plate, ensuring the tightness of the fixed connection between the straight rod and the pressure sensor base.

[0015] Furthermore, the pressure-taking hole includes a horizontal hole portion and a vertical hole portion, the top of the vertical hole portion is communicated with the cavity, and the bottom of the vertical hole portion is communicated with the horizontal hole portion.

[0016] Through the above technical solution, the vertical hole portion connects the horizontal hole portion and the bottom of the pressure sensor, the vertical hole portion is connected to the horizontal hole portion, the horizontal hole portion is parallel to the extension direction of the pipeline, and measures the pressure in the pipeline in the opposite direction of the water flow, thereby ensuring the accuracy of the water pressure detected by the pressure sensor.

[0017] Furthermore, the outer side wall of the pipeline is provided with a fixing structure.

[0018] Through the above technical solution, the fixed structure is used to limit the position of the straight rod in the pressure-taking structure.

[0019] In summary, the present application includes at least one of the following beneficial effects:

[0020] 1. In this application, when measuring the internal pressure of a pipeline, the insertion rod in the built-in pressure measuring structure is first inserted into the pipeline, with the top of the straight rod extending out of the pipeline and the bottom of the straight rod immersed in the pipeline; the pressure taking hole transmits the pressure in the pipeline to the diaphragm at the bottom of the pressure sensor. The diaphragm senses the change in pressure, causing the pressure sensor to generate an electrical signal corresponding to the pressure. The converter calculates the pressure value based on the pressure electrical signal output by the pressure sensor.

[0021] 2. The built-in pressure measurement structure in this case is directly extended into the interior of the pipeline when in use. The measuring body is built into the pipeline instead of being exposed. Compared with the existing technology of exposing the pressure measurement mechanism outside the pipeline, it obviously saves more installation space and reduces the risk of human damage. At the same time, the built-in pressure sensor can reduce bubbles and thus improve measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the pressure taking structure in this application;

[0023] Figure 2 yes Figure 1 Schematic cross-section of the detection structure;

[0024] Figure 3 This application Figure 2 Enlarged structural diagram at point A in the middle.

[0025] Figure numerals: flow measurement sensor 1, straight rod 2, pipeline 3, valve 4, pressure measurement mechanism 5, converter 6, pressure sensor base 7, pressure tapping hole 8, pressure sensor 9, buffer gasket 10, fixing plate 11, fixing part 15, restraining belt 16. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-3 This application is described in further detail.

[0027] The embodiments of the present application disclose a built-in pressure-taking structure for an insertion-type electromagnetic flowmeter.

[0028] The utility model provides an insertion type electromagnetic flowmeter with a built-in pressure taking structure, such as Figure 1 and Figure 2As shown, the built-in pressure-taking structure includes an insertion rod, which includes a converter 6, a straight rod 2, a pressure measuring mechanism 5 and a flow measurement sensor 1 connected in sequence from top to bottom. The top of the straight rod 2 in the insertion rod extends out of the pipe 3 and passes through the valve 4 to be connected to the converter 6. The bottom of the straight rod 2 extends below the horizontal plane of the pipe 3 along with the insertion rod, so that the pressure measuring mechanism 5 and the flow measurement sensor 1 are both located underwater in the pipe 3.

[0029] The pressure measurement mechanism 5 includes a pressure sensor base 7, the top of which is connected to the bottom of the straight rod 2, which in turn is fixedly connected to the top of the flow measurement sensor 1. A pressure tapping hole 8 is defined on one side of the pressure sensor base 7, and a pressure sensor 9 is fixedly connected to the interior of the pressure sensor base 7, the bottom of which is in communication with the pressure tapping hole 8. A fixing mechanism is provided on the outer wall of the pipe 3 to limit the position of the inserted rod 2. Typically, the fixing mechanism is fixedly connected to the valve 4 and includes a fixing member 15 and a restraining strap 16.

[0030] Before the pressure-taking mechanism in this solution is officially deployed, the straight rod 2 in the insert rod is passed through the valve and then extended into the pipe 3. The valve 4 is connected to the pipe 3 using a fixing mechanism, with the tie band 16 pressed against the outer wall of the pipe 3. The tie band 16 is tightened by the fixing member 15, and the valve 4 is fixed to the top of the fixing mechanism. The measuring pipe 3 is then secured between the two conveying pipes 3 using flanges. The straight rod 2, along with the pressure measuring mechanism 5 and sensor at its bottom, is then inserted into the pipe 3.

[0031] When measuring the flow velocity in the pipeline, the flow measurement sensor 1 located in the water in the pipeline 3 uses the principle of electromagnetic induction to convert the detected water flow velocity into an electrical signal, generating a flow velocity electrical signal, so that the subsequent converter 6 can measure the flow velocity and flow rate of the fluid in the pipeline according to the size of the flow velocity electrical signal.

[0032] When measuring the internal pressure of the pipeline, the pressure hole 8 transmits the pressure in the pipeline 3 to the diaphragm at the bottom of the pressure sensor 9. The diaphragm senses the change in pressure, causing the pressure sensor 9 to generate a pressure electrical signal corresponding to the pressure. Then the converter 6 calculates the pressure value based on the pressure electrical signal output by the pressure sensor 9.

[0033] In some examples, reference Figure 2 A cavity is provided in the middle of the pressure sensor base 7, in which the pressure sensor 9 is fixedly installed. The pressure taking hole 8 is connected to the bottom of the cavity. A buffer gasket 10 is provided at the bottom of the cavity, and the buffer gasket is placed at the bottom of the pressure sensor.

[0034] The pressure sensor 9 is installed in the cavity, and a gap is left between the buffer gasket 10 and the sensor to provide a buffer for the pressure sensor and avoid damage caused by instantaneous pressure impact.

[0035] In some examples, reference Figure 2 A fixing plate 11 is provided on the top of the cavity, and a fixing bolt is provided on the upper part of the fixing plate 11. The fixing bolt is connected to the thread on the pressure sensor base 7, and the fixing plate 11 is against the top of the pressure sensor 9. The bolt fixes the fixing plate 11 to prevent the pressure sensor 9 from moving upward.

[0036] Pressure tapping hole 8 consists of a horizontal portion and a vertical portion. The top of the vertical portion connects to the cavity, while the bottom of the vertical portion connects to the horizontal portion. During installation, workers ensure that the horizontal portion is parallel to the extension of the pipe and measure the pressure inside the pipe in the opposite direction of the water flow, ensuring the accuracy of the water pressure detected by pressure sensor 9.

[0037] Working Principle: When the flow velocity inside pipe 3 needs to be measured, flow measurement sensor 1 can accurately detect the flow velocity inside pipe 3. During measurement, the water flow velocity is converted into an electromotive force through the measuring mechanism using the principle of electromagnetic induction. Then, the electromotive force is converted into flow rate through converter 6. When the pressure inside pipe 3 needs to be measured, pressure tapping hole 8 transmits the pressure inside pipe 3 to the diaphragm at the bottom of pressure sensor 9. The diaphragm senses the pressure change, causing pressure sensor 9 to generate a pressure signal corresponding to the pressure. Converter 6 calculates the pressure value based on the pressure signal output by pressure sensor 9.

[0038] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. The insertion type electromagnetic flowmeter has a built-in pressure taking structure, which is characterized by: The invention comprises an insertion rod, wherein the insertion rod comprises a converter (6), a straight rod (2), a pressure measuring mechanism (5) and a flow measurement sensor (1) connected in sequence from top to bottom; The pressure measuring mechanism (5) comprises a pressure sensor base (7), the top of the pressure sensor base (7) is connected to the bottom of the straight rod (2), the bottom of the pressure sensor base (7) is fixedly connected to the top of the flow measurement sensor (1), a pressure taking hole (8) is provided on one side of the pressure sensor base (7), a pressure sensor (9) is fixedly provided inside the pressure sensor base (7), and the bottom of the pressure sensor (9) is connected to the pressure taking hole (8).

2. The built-in pressure-taking structure of the insertion-type electromagnetic flowmeter according to claim 1 is characterized in that: A cavity is provided in the middle of the pressure sensor base (7), the pressure sensor (9) is fixedly arranged in the cavity, the pressure taking hole (8) is communicated with the bottom of the cavity, a buffer gasket (10) is provided at the bottom of the cavity, and the buffer gasket (10) is placed at the bottom of the pressure sensor (9).

3. The built-in pressure-taking structure of the insertion-type electromagnetic flowmeter according to claim 2, characterized in that: A fixing plate (11) is provided at the top of the cavity, a fixing bolt is provided on the upper portion of the fixing plate (11), the fixing bolt is threadedly connected to the pressure sensor base (7), and the fixing plate (11) abuts against the top of the pressure sensor (9).

4. The built-in pressure-taking structure of the insertion-type electromagnetic flowmeter according to claim 2, characterized in that: The pressure-taking hole (8) comprises a horizontal hole portion and a vertical hole portion, wherein the top of the vertical hole portion is communicated with the cavity, and the bottom of the vertical hole portion is communicated with the horizontal hole portion.

5. The built-in pressure-taking structure of the insertion-type electromagnetic flowmeter according to claim 1, characterized in that: The outer side wall of the pipeline (3) is provided with a fixing structure.

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