Self-powered birotor flowmeter

Abstract

The invention relates to a self-powered double-rotor flow meter, and belongs to the technical field of flow meters. Comprising a birotor flow meter and a thermoelectric power generation piece, the thermoelectric power generation piece is attached to the side wall of the birotor flow meter, the other side of the thermoelectric power generation piece makes contact with the external environment, and when temperature difference exists at the two ends of the thermoelectric power generation piece, the thermoelectric power generation piece supplies power to the birotor flow meter. The flowmeter performs flow metering, remote transmission and receiving display under the condition that the flowmeter is not connected to a power grid, so that the installation difficulty and cost of the flowmeter are reduced, the applicability and accuracy of the flowmeter under various conditions are improved, and the cost is saved; autonomous power generation is realized by combining with a thermoelectric power generation technology under the condition that the internal structure of the birotor flow meter is not changed, so that the metering accuracy is guaranteed, and flow data acquisition and transmission can be completed without a distribution line.

Description

Technical Field

[0001] The invention relates to a self-powered double-rotor flowmeter, belonging to the technical field of flowmeters. Background Art

[0002] At present, in the production process of oil and gas fields, vortex flowmeters are mostly used to measure gas well flow, and the measured data is transmitted to the well site RTU in real time to achieve real-time measurement and transmission of gas well production data, thereby realizing remote control of gas wells. When the vortex flowmeter measurement is interrupted or the data is lost, it will lead to the inability to achieve remote control of the gas well, affecting the normal production of the gas well. The existing vortex flowmeter is powered by station power or solar batteries at the gas field production site, but the remote station has no mains access and cannot be powered normally. In response to this, the technical research and development of self-generated flowmeters has been carried out. At present, domestic self-generated flowmeters all use the kinetic energy of the metering medium to generate electricity. For example, the patent application publication number CN113465689B discloses a self-generated flowmeter, the patent application publication number CN112796733A discloses a self-generated vortex flowmeter, and the patent application publication number CN114199320A discloses a gas turbine flowmeter with self-generating function. As the call for environmental protection and energy conservation in modern society becomes louder and louder, people are more concerned about how to effectively convert thermal energy such as solar heat, ocean heat, geothermal heat, and industrial waste heat into electrical energy. Thermoelectric generator is a device that uses the Seebeck effect to directly convert thermal energy into electrical energy. When working, one end of the generator is maintained at a high temperature and the other end is maintained at a low temperature. The thermoelectric power generation unit uses the temperature difference between the hot end and the cold end to convert thermal energy into electrical energy output. Thermoelectric generator has the characteristics of no noise, long life, and stable performance. There is no precedent for applying thermoelectric power generation technology to dual rotor flowmeters. Summary of the invention

[0003] In order to enable the flow meter to measure flow, remotely transmit and receive and display without being connected to the power grid, reduce the difficulty and cost of installing the flow meter, improve its applicability and accuracy under various conditions, and save costs, the present invention discloses a self-powered dual-rotor flowmeter, which generates electricity through the temperature difference between the metering medium and the environment, realizes autonomous power generation without changing the internal structure of the dual-rotor flowmeter, and ensures the accuracy of measurement.

[0004] The technical solution adopted by the present invention is to provide a self-powered dual-rotor flowmeter, including a dual-rotor flowmeter and a thermoelectric power generation sheet. The thermoelectric power generation sheet is attached to the side wall of the dual-rotor flowmeter, and the other side of the thermoelectric power generation sheet is in contact with the external environment. When there is a temperature difference at both ends of the thermoelectric power generation sheet, the thermoelectric power generation sheet supplies power to the dual-rotor flowmeter.

[0005] Furthermore, the thermoelectric power generation sheet comprises a hot end substrate, a thermoelectric power generation unit and a cold end substrate, and the thermoelectric power generation unit is arranged between the hot end substrate and the cold end substrate.

[0006] The hot end substrate and the cold end substrate are made of insulating heat-conducting materials, and the insulating heat-conducting material is one of an aluminum oxide ceramic sheet, an aluminum nitride ceramic sheet, and a silicon carbide ceramic sheet.

[0007] Furthermore, the temperature difference power generation unit includes several groups of staggered N-type semiconductor elements and P-type semiconductor elements, the ends of adjacent N-type semiconductor elements and P-type semiconductor elements are connected by metal guide plates, and several metal guide plates are respectively arranged on the inner side of the hot end substrate and the cold end substrate.

[0008] Furthermore, the self-powered dual-rotor flowmeter is also connected to a pulse signal transceiver, the temperature difference power generation unit is electrically connected to the pulse signal transceiver, the pulse signal transceiver is divided into a pulse signal transmitting end and a pulse signal receiving end, the pulse signal transmitting end converts the flow information into a pulse signal related to the flow and transmits it to the pulse signal transmitting and receiving end for display and remote transmission.

[0009] The present invention discloses a self-powered dual-rotor flowmeter, which has the beneficial effects of performing flow metering, remote transmission and receiving display without being connected to a power grid, thereby reducing the difficulty and cost of installing the flowmeter, improving its applicability and accuracy under various conditions, and saving costs; without changing the internal structure of the dual-rotor flowmeter, it is combined with a temperature difference power generation technology to achieve autonomous power generation, thereby ensuring the accuracy of the measurement, and completing the flow data collection and transmission without the need for a distribution line. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0011] Figure 1 The figure shows the flow detection principle diagram of the double rotor flowmeter;

[0012] Figure 2 Shown is a schematic structural diagram of Embodiment 1 of the present invention;

[0013] Figure 3 Shown is a schematic diagram of a temperature difference power generation sheet in Example 1 of the present invention.

[0014] As shown in the figure: 1. Temperature difference power generation sheet; 2. Dual rotor flowmeter; 3. Precision adjustment system; 401. Pulse signal transmitting end; 402. Pulse signal receiving end; 5. Flow meter display dial; 6. Hot end substrate; 7. Cold end substrate; 8. Temperature difference power generation unit; 9. Metal guide plate.

[0015] Specific implementation methods

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In order to further understand the content of the present invention, the present invention is further described below in conjunction with specific implementation methods.

[0018] Example 1: Figures 1-2 As shown, the self-powered dual rotor flowmeter includes a dual rotor flowmeter 2 and a thermoelectric power generation sheet 1. The heat absorbing end of the thermoelectric power generation sheet 1 is attached to the side wall of the dual rotor flowmeter 2, and the heat dissipating end of the thermoelectric power generation sheet 1 is in contact with the external environment. When there is a temperature difference between the two ends of the thermoelectric power generation sheet 1, the thermoelectric power generation sheet 1 supplies power to the dual rotor flowmeter 2. The thermoelectric power generation sheet 1 includes a hot end substrate 6, a thermoelectric power generation unit 8 and a cold end substrate 7. The thermoelectric power generation unit 8 is arranged between the hot end substrate 6 and the cold end substrate 7. The hot end substrate 6 and the cold end substrate 7 are insulating thermal conductive materials, and the insulating thermal conductive materials are one of alumina ceramic sheets, aluminum nitride ceramic sheets, and silicon carbide ceramic sheets. The thermoelectric power generation unit 8 includes a plurality of groups of staggered N-type semiconductor elements and P-type semiconductor elements. The ends of adjacent N-type semiconductor elements and P-type semiconductor elements are connected by metal guide sheets 9. The plurality of metal guide sheets 9 are respectively arranged on the inner sides of the hot end substrate 6 and the cold end substrate 7.

[0019] The self-powered dual rotor flowmeter 2 is also connected to a pulse signal transceiver, the temperature difference power generation unit is electrically connected to the pulse signal transceiver, and the pulse signal transceiver is divided into a pulse signal transmitter 401 and a pulse signal receiver 402. The heat absorption surface of the temperature difference power generation sheet 1 is fixed on the side of the dual rotor flowmeter 2 (the hot end temperature is about 80°C), and the heat dissipation surface of the temperature difference power generation sheet 1 is in contact with the air (the cold end temperature is about equal to the ambient temperature -20°C). When there is a temperature difference between the two ends of the temperature difference power generation sheet 1, the temperature difference power generation sheet 1 can generate continuous direct current, and the greater the temperature difference between the two ends, the greater the direct current power it generates; the dual rotor flowmeter 2 displays the detected flow on the dual rotor flowmeter display dial 5 by driving the transmission gear to rotate. The pulse signal transmitter 401 converts the flow information into a pulse signal related to the flow and transmits it to the pulse signal receiver 402, thereby realizing the remote transmission of the flow data.

[0020] The twin-rotor flowmeter 2 is divided into a flow detection system and a precision adjustment system 3. The flow detection system mainly has a sealed cavity composed of a pair of spiral rotors and a cover plate as a unit of flow measurement. The rotor rotates under the pressure of the liquid, and the closed space formed between the rotor and the wall of the metering cavity discharges a fixed volume each time it rotates. Therefore, based on this relationship, the accumulated flow can be calculated by measuring the number of times the rotor rotates, and the instantaneous flow can be measured based on the number of revolutions per second. The rotor is driven to rotate by the pressure difference at the inlet and outlet of the twin-rotor flowmeter 2, thereby continuously sending the liquid at the inlet to the outlet after being measured through the sealed cavity. The amount of liquid flowing through each revolution is Figure 1 The seal coupling transmits the total number of rotor rotations and the speed of rotation to the counting mechanism, and the pointer displays and the word wheel accumulates, so the total amount of liquid passing through the pipeline can be known. The precision adjustment system consists of a magnetic coupling, a speed reduction mechanism, an adjustment gear, and a counter. The rotation of the rotor of the dual rotor flowmeter 2 drives the magnetic coupling to move. After the speed reduction mechanism slows down, the rotation of the rotor drives the adjustment gear to rotate. After being measured by the counter, the flow rate flowing through the dual rotor flowmeter 2 is displayed. The flowmeter accuracy can be adjusted by adjusting the gear structure of the gear set.

[0021] The innovation of the present invention is that the temperature difference power generation technology and the dual rotor flow meter 2 detection technology are integrated into a set of equipment, and the power demand of the flow meter and the remote transmission device can be met through temperature difference power generation.

[0022] Principle of temperature difference power generation system

[0023] Since different metals have different electron densities, when the two metals come into contact with each other, electrons will flow at the contact point. The electrons will flow from the end with high density to the end with low density. The diffusion rate of electrons is proportional to the temperature, so as long as the temperature difference between the two metals is maintained, the flow of electrons can be maintained, and a potential difference will be formed at both ends of the metal.

[0024] Take the installation of a dual rotor flowmeter in a joint station that needs to be connected to the power grid as an example:

[0025] The flow meter is 280 meters away from the power distribution room. Because it needs to avoid buildings, roads and underground pipelines, the cable laying distance needs to be increased by 200 meters, and a total of 480 meters of cables need to be laid. The required cable unit price is 22 yuan / meter, the cable protection tube is 5 yuan / meter, and the laying labor cost is 30 yuan / meter. The total cable laying cost M = (22+5+30) × 480 = 27,360 yuan; the total cost of the temperature difference power generation system is 2,200 yuan, which can save 25,160 yuan in installation cost J.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Self-powered dual rotor flowmeter, characterized in that, The invention comprises a dual rotor flow meter (2) and a temperature difference power generation sheet (1), wherein the temperature difference power generation sheet (1) is attached to the side wall of the dual rotor flow meter (2), and the other side of the temperature difference power generation sheet (1) is in contact with the external environment. When a temperature difference exists between the two ends of the temperature difference power generation sheet (1), the temperature difference power generation sheet (1) supplies power to the dual rotor flow meter (2).

2. The self-powered dual rotor flowmeter according to claim 1, characterized in that: The thermoelectric power generation sheet (1) comprises a hot end substrate (6), a thermoelectric power generation unit (8) and a cold end substrate (7), wherein the thermoelectric power generation unit (8) is arranged between the hot end substrate (6) and the cold end substrate (7).

3. The self-powered dual rotor flowmeter according to claim 2, characterized in that: The hot end substrate (6) and the cold end substrate (7) are made of insulating heat-conducting materials.

4. The self-powered dual rotor flowmeter according to claim 3, characterized in that: The insulating thermal conductive material is one of an aluminum oxide ceramic sheet, an aluminum nitride ceramic sheet, and a silicon carbide ceramic sheet.

5. The self-powered dual rotor flowmeter according to claim 4, characterized in that: The temperature difference power generation unit (8) comprises a plurality of groups of staggeredly arranged N-type semiconductor elements and P-type semiconductor elements, the ends of adjacent N-type semiconductor elements and P-type semiconductor elements are connected via metal guide plates (9), and the plurality of metal guide plates (9) are respectively arranged on the inner side of a hot end substrate (6) and a cold end substrate (7).

6. The self-powered dual rotor flowmeter according to claim 1, characterized in that: The self-powered dual-rotor flowmeter (2) is also connected to a pulse signal transceiver, the temperature difference power generation unit (8) is electrically connected to the pulse signal transceiver, the pulse signal transceiver is divided into a pulse signal transmitting end (401) and a pulse signal receiving end (402), the pulse signal transmitting end (401) converts flow information into a pulse signal related to the flow and transmits it to the pulse signal transmitting and receiving end for display and remote transmission.

7. The self-powered dual-rotor flowmeter according to any one of claims 1 to 6, characterized in that: The double rotor flow meter (2) drives the transmission gear to rotate and displays the detected flow on the double rotor flow meter display dial (5).

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