Guide device of flow meter

Abstract

The invention relates to the technical field of petroleum equipment, in particular to a flow meter guiding device which is particularly suitable for solving the problem that gas-phase substances interfere with liquid-phase flow measurement. The impulse sensing type float flowmeter design is adopted, and a flow guide pipe double-channel structure is combined, so that efficient flow guide of gas-phase substances and stability of air pressure in a cavity are achieved; through the non-contact detection of the linear Hall sensor and the permanent magnet, the influence of mechanical wear on the measurement precision is eliminated. The inlet positions of the flow guide pipe A and the flow guide pipe B are designed in the liquid measuring cavity close to the accumulation position of gas-phase substances, and the gas-phase export efficiency is enhanced by utilizing the flow velocity inertia of the gas-phase substances. According to the guiding device of the flow meter, gas phase interference is effectively eliminated through the design method, the liquid phase flow metering precision is improved, and the guiding device is suitable for precise measurement of gas-liquid mixed media such as crude oil.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum equipment, and in particular to a guide device of a flow meter, which is particularly suitable for solving the scenario where gas phase substances interfere with liquid phase flow measurement. Background Art

[0002] When measuring crude oil containing gas-liquid mixed phases, the traditional float flowmeter accumulates gas phase substances in the liquid measurement chamber, causing the air pressure in the chamber to increase. The float is lifted too high by the air pressure and cannot truly reflect the liquid phase flow, resulting in measurement errors. In the prior art, although attempts have been made to improve it through mechanical isolation or gas-liquid separators, there are problems such as complex structure, low separation efficiency, and high maintenance cost. Therefore, there is an urgent need for a device that can efficiently separate gas phase substances and stably measure liquid phase flow. Summary of the invention

[0003] In order to solve the above technical problems, a flow meter guide device is provided, which optimizes the guide tube structure to quickly guide the gas phase material from the liquid measuring cavity to the liquid outlet, avoiding the pressure fluctuation in the cavity caused by gas phase accumulation, thereby improving the liquid phase flow measurement accuracy. The present invention adopts the following technical solutions: A guide device for a flow meter, the device part of which includes a liquid inlet, a liquid outlet, a liquid measuring chamber shell, a guide tube, a sealing flange, a protective shell, a digital display instrument, a liquid measuring chamber, a liquid measuring tube, a float, a float connecting rod, a permanent magnet, a Hall sensor protective shell, and a linear Hall sensor; wherein a float, a float connecting rod, a permanent magnet, a linear Hall sensor protective shell and a linear Hall sensor are arranged inside the liquid measuring chamber, and the float is connected to the permanent magnet through the float connecting rod; the guide tube system includes a guide tube A and a guide tube B, wherein the guide tube A and the guide tube B are arranged on the side wall of the liquid measuring chamber shell, and the inlet thereof is located inside the liquid measuring chamber near the accumulation of gas phase materials, and the outlet extends to a position close to the liquid outlet; the guide tube B and the guide tube A form a pressure balance channel; the digital display instrument is located on the top of the protective shell, and the digital display instrument calculates and displays the liquid phase flow based on the Hall signal; the sealing flange adopts an explosion-proof sealing structure to ensure the safety of the device in a flammable and explosive environment.

[0004] A guide device for a flow meter, wherein after crude oil enters a liquid measuring cavity, liquid phase material pushes a float to move upward, and gas phase material adjusts the pressure difference between the inside and outside of the liquid measuring cavity through flow guide pipes A and B to avoid gas phase material being retained in the cavity and is quickly guided out to a liquid outlet; a linear Hall sensor generates an electrical signal through the position change of a permanent magnet, and a digital display instrument calculates the real-time flow and the accumulated flow according to the linear relationship between the signal strength and the float displacement.

[0005] Preferably, the guide tube is disposed on the side wall of the liquid measuring cavity, the guide tube inlet is located inside the liquid measuring cavity close to where the gas phase material accumulates, and the guide tube outlet is located close to the liquid outlet.

[0006] Preferably, the float is fixed to the permanent magnet via a float connecting rod, and the linear Hall sensor is installed on the top of the liquid measuring chamber to form a non-contact displacement detection system with the permanent magnet.

[0007] Preferably, the protective housing, sealing flange and liquid measuring chamber housing are designed with corrosion-resistant and explosion-proof materials.

[0008] Preferably, the digital display instrument is a device integrating data acquisition processing and data transmission functional assembly.

[0009] The beneficial effects of the present invention are: adopting the design of impulse-sensing float flowmeter, combined with the dual-channel structure of the guide tube, to achieve efficient flow guidance of gas phase materials and stable gas pressure in the cavity; through non-contact detection of linear Hall sensor and permanent magnet, the influence of mechanical wear on measurement accuracy is eliminated; the inlet position of the guide tube A and the guide tube B is designed to be close to the accumulation of gas phase materials inside the liquid measurement cavity, and the inertia of the gas phase material flow rate is used to enhance the gas phase extraction efficiency. A guide device of a flowmeter uses the above design method to effectively eliminate gas phase interference and improve the liquid phase flow measurement accuracy, which is suitable for the precise measurement of gas-liquid mixed media such as crude oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The present invention is a schematic diagram of the top view structure of a guide device of a flow meter.

[0011] Figure 2 The present invention is a schematic diagram of the three-dimensional structure of a guide device of a flow meter.

[0012] Figure 3 The present invention is a schematic diagram of a cross-sectional structure of a guide device of a flow meter in a liquid-containing and gas-containing state.

[0013] Figure 4 It is a guide device of a flow meter and another structure diagram of a guide tube.

[0014] In the figure: 101-liquid inlet, 102-liquid outlet, 201-liquid measuring chamber housing, 202-flow guide tube A, 203-flow guide tube B, 204-sealing flange, 205-protective housing, 206-digital display instrument, 301-liquid measuring chamber, 302-liquid measuring tube, 303-float, 304-float connecting rod, 305-permanent magnet, 306-Hall sensor protection housing, 307-linear Hall sensor, 308-flow guide tube inlet, 309-flow guide tube outlet, 310-liquid phase substance identification, 401-flow guide tube. DETAILED DESCRIPTION

[0015] The embodiment of the present invention provides a guide device for a flow meter, such as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a guiding device of a flow meter includes a liquid inlet 101, a liquid outlet 102, a liquid measuring chamber housing 201, a guide tube A 202, a guide tube B 203, a sealing flange 204, a protective housing 205, a digital display instrument 206, a liquid measuring chamber 301, a liquid measuring tube 302, a float 303, a float connecting rod 304, a permanent magnet 305, a Hall sensor protective housing 306, a linear Hall sensor 307, a guide tube inlet 308, a guide tube outlet 309, and a liquid phase substance identifier 310. The liquid inlet 101 is the crude oil inlet, and the liquid outlet 102 is the crude oil outlet. A float 303, a float connecting rod 304, a permanent magnet 305, a linear Hall sensor protection shell 306 and a linear Hall sensor 307 are arranged inside the liquid measuring chamber 301. The float 303 is connected to the permanent magnet 305 through the float connecting rod 304. The flow guide pipe system includes a flow guide pipe A202 and a flow guide pipe B203, wherein the flow guide pipe A202 and the flow guide pipe B203 are arranged on the side wall of the liquid measuring chamber shell 201, and the inlet thereof is located inside the liquid measuring chamber 301 near the accumulation of gas phase substances, and the outlet extends to a position close to the liquid outlet 102; the flow guide pipe A202 and the flow guide pipe B203 form a pressure balance channel, Figure 4 It is another design structure of the flow guide tube; the digital display instrument 206 is located on the top of the protective shell 205, and the digital display instrument 206 calculates and displays the liquid phase flow based on the Hall signal; the sealing flange 204 adopts an explosion-proof sealing structure to ensure the safety of the device in a flammable and explosive environment.

[0016] The embodiment of the present invention is that when the guide device of a flow meter is in working state, crude oil flows through the liquid inlet 101 through the liquid measuring tube 302 into the liquid measuring chamber 301. When the crude oil flows into the liquid measuring tube 302, the float 303 will be lifted up, and the oil-encapsulated gas contained in the crude oil will accumulate at the top of the internal space of the liquid measuring chamber 301 in the form of bubbles, air masses, etc. after the crude oil flows into the liquid measuring chamber 301. At this time, the accumulated gaseous substances will be introduced into the guide tube A202 and the guide tube B203 respectively through the guide tube inlet 308 located inside the liquid measuring chamber 301 near the accumulation of gaseous substances, and then discharged into the liquid outlet 102 through the guide tube outlet 309 located near the position of the liquid outlet 102 and then discharged from the metering pipeline. The guide device of a flow meter guides the gaseous substances from the liquid measuring chamber 301 through the dual-channel design of the guide tube, and detects the displacement of the float 303 in combination with the linear Hall sensor 307, effectively eliminating gas phase interference and improving the measurement accuracy of liquid phase flow.

[0017] The above are preferred embodiments of the present invention. It should be pointed out that a person skilled in the art may make several improvements and modifications without departing from the principles of the invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A guide device for a flow meter, characterized in that: The device part includes a liquid inlet, a liquid outlet, a liquid measuring chamber shell, a guide tube, a sealing flange, a protective shell, a digital display instrument, a liquid measuring chamber, a liquid measuring tube, a float, a float connecting rod, a permanent magnet, a Hall sensor protective shell, and a linear Hall sensor; wherein, a float, a float connecting rod, a permanent magnet, a linear Hall sensor protective shell and a linear Hall sensor are arranged inside the liquid measuring chamber, and the float is connected to the permanent magnet through the float connecting rod; the guide tube system includes a guide tube A and a guide tube B, wherein the guide tube A and the guide tube B are arranged on the side wall of the liquid measuring chamber shell, and the inlet thereof is located inside the liquid measuring chamber near the accumulation of gas phase materials, and the outlet extends to a position close to the liquid outlet; the guide tube B and the guide tube A form a pressure balance channel; the digital display instrument is located on the top of the protective shell, and the digital display instrument calculates and displays the liquid phase flow based on the Hall signal; the sealing flange adopts an explosion-proof sealing structure to ensure the safety of the device in flammable and explosive environments.

2. A flow meter guide device according to claim 1, characterized in that: The method is as follows: after the crude oil enters the liquid measuring cavity, the liquid phase material pushes the float to move upward, and the gas phase material adjusts the pressure difference between the inside and outside of the liquid measuring cavity through the guide tube A and the guide tube B to avoid the gas phase material from being retained in the cavity and is quickly guided to the liquid outlet; The linear Hall sensor generates an electrical signal through the change in the position of the permanent magnet, and the digital display instrument calculates the real-time flow rate and the accumulated flow rate based on the linear relationship between the signal strength and the float displacement.

3. A flow meter guide device according to claim 1, characterized in that: The flow guide tube is disposed on the side wall of the liquid measuring cavity, the flow guide tube inlet is located inside the liquid measuring cavity close to where the gas phase material accumulates, and the flow guide tube outlet is located close to the liquid outlet.

4. A flow meter guide device according to claim 1, characterized in that: The float is fixed to the permanent magnet through a float connecting rod, and the linear Hall sensor is installed on the top of the liquid measuring cavity to form a non-contact displacement detection system with the permanent magnet.

5. A flow meter guide device according to claim 1, characterized in that: The protective shell, sealing flange and liquid measuring chamber shell are designed with anti-corrosion and explosion-proof materials.

6. A flow meter guide device according to claim 1, characterized in that: The digital display instrument is a device integrating data acquisition processing and data transmission functions.

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