A heat conducting oil heating system

Abstract

This utility model discloses a heat transfer oil heating system, including a circulating pipeline system, an oil tank, an oil pump, a heating device, a differential pressure flow meter, and a control system. The circulating pipeline system includes interconnected main pipes and heat exchange pipes. The oil tank is connected to the main pipe and supplies heat transfer oil. The oil pump is located on the main pipe, between the oil tank and the heat exchange pipes, and is used to pump the heat transfer oil for circulation. The heating device is located on the main pipe, between the oil pump and the heat exchange pipes, and is used to heat the heat transfer oil. The differential pressure flow meter is located on the main pipe, between the oil pump and the heating device. The heating device and the differential pressure flow meter are electrically connected to the control system. The control system can control the switching on and off of the heating device based on the detection data from the differential pressure flow meter. The aforementioned differential pressure flow meter is suitable for high-temperature environments and heat transfer oils, operates stably, is less prone to false alarms, and can more reliably detect the flow of heat transfer oil.

Description

Technical Field

[0001] This utility model relates to the technical field of transformer manufacturing, and in particular to a heat transfer oil heating system. Background Technology

[0002] In the drying process of power transformers, the drying equipment often uses electric heating rods to heat the heat transfer oil. The heat transfer oil pipes heat the transformer through heat exchange with kerosene, air, and thermal radiation. This heating method has a high power, so it generates a lot of heat in a short time. It is necessary to circulate the heat transfer oil through a heat transfer oil pump to remove the heat for heat exchange. If the heat transfer oil does not flow during the heating process, it will cause the heater to generate too much heat in a short time, resulting in high temperature and accidents. In some technologies, microswitches are installed in the pipeline. When the heat transfer oil flows, it pushes the microswitch to move its dial. When the heat transfer oil stops flowing, the microswitch disconnects the signal for flow detection. However, the heating equipment often heats continuously without interruption. Under high temperature conditions, the heat transfer oil may carbonize and form impurities. There may also be certain welding slag and impurities inside the pipeline. The microswitch dial often gets stuck or cannot reset, causing malfunctions, stopping the equipment, affecting production, and the detection effect is not stable and reliable. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a heat transfer oil heating system that can solve the problem of unstable heat transfer oil flow detection.

[0004] A heat transfer oil heating system according to a first aspect of the present invention includes: a circulating pipeline system, an oil tank, an oil pump, a heating device, a differential pressure flow meter, and a control system. The circulating pipeline system includes a main pipe and a heat exchange pipe connected to each other. The oil tank is connected to the main pipe and supplies heat transfer oil. The oil pump is located on the main pipe and between the oil tank and the heat exchange pipe, and is used to pump the heat transfer oil for circulation. The heating device is located on the main pipe and between the oil pump and the heat exchange pipe, and is used to heat the heat transfer oil. The differential pressure flow meter is located on the main pipe and between the oil pump and the heating device. The heating device and the differential pressure flow meter are electrically connected to the control system, and the control system can control the switching of the heating device based on the detection data of the differential pressure flow meter.

[0005] According to an embodiment of the present invention, a heat transfer oil heating system has at least the following beneficial effects: the differential pressure flow meter detects the flow rate by detecting the pressure difference before and after the flow meter; the control system can control the heating device to stop heating based on the detection data of the differential pressure flow meter to avoid accidents; the aforementioned differential pressure flow meter is suitable for high-temperature environments and also for almost insulating heat transfer oils; it operates stably; and even if there are impurities in the pipeline, it will not affect the pressure detection, and it is not easy to cause false alarms, thereby enabling more stable and reliable detection of the flow of heat transfer oil.

[0006] According to some embodiments of this utility model, the differential pressure flow meter is configured as an orifice plate flow meter.

[0007] According to some embodiments of the present invention, the heating device is provided with a first temperature sensor, which is electrically connected to the control system.

[0008] According to some embodiments of the present invention, a second temperature sensor is provided between the heating device and the heat exchange tube, and the second temperature sensor is electrically connected to the control system.

[0009] According to some embodiments of the present invention, the heating device includes a plurality of heating rods, and the first temperature sensor is disposed close to the heating rods.

[0010] According to some embodiments of the present invention, it also includes a furnace body, wherein multiple heat exchange tubes are provided, and each heat exchange tube is arranged in parallel with the main tube, and the heat exchange tubes are located in the furnace body.

[0011] According to some embodiments of this utility model, the flow rate sensed by the differential pressure flow meter is Q1, and the rated flow rate is Q2. When Q1 < 0.3Q2, the control system can control the heating device to stop heating.

[0012] According to some embodiments of the present invention, the orifice plate flow meter includes a first pressure sensor, an orifice plate structure, and a second pressure sensor. The orifice plate structure is connected to the main pipe. The first pressure sensor is located at the input end of the orifice plate structure, and the second pressure sensor is located at the output end of the orifice plate structure.

[0013] According to some embodiments of the present invention, the first pressure sensor detects a pressure value of P1, and the second pressure sensor detects a pressure value of P2. When both P1 and P2 are greater than 0.3 MPa, the control system controls the heating device to stop heating.

[0014] According to some embodiments of the present invention, the first pressure sensor detects a pressure value of P1, and the second pressure sensor detects a pressure value of P2. When both P1 and P2 are less than 0.1 MPa, the control system controls the heating device to stop heating.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 These are schematic diagrams of some embodiments of the present utility model;

[0018] Figure 2 These are schematic diagrams of some embodiments of the present utility model;

[0019] Figure 3 This is a schematic diagram of some embodiments of the present invention.

[0020] Figure label:

[0021] Main tube 110, heat exchange tube 120;

[0022] Fuel tank capacity: 200;

[0023] Oil pump 300;

[0024] Heating device 400, first temperature sensor 410, second temperature sensor 420;

[0025] Orifice plate flow meter 500, first pressure sensor 510, orifice plate structure 520, second pressure sensor 530;

[0026] Furnace body 600;

[0027] Filter 710, first on / off valve 720, second on / off valve 730, heating valve 740. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Reference Figures 1 to 3 According to a first aspect of the present invention, a heat transfer oil heating system includes a circulation pipeline system, an oil tank 200, an oil pump 300, a heating device 400, a differential pressure flow meter, and a control system. The circulation pipeline system includes a main pipe 110 and a heat exchange pipe 120 connected to each other. The oil tank 200 is connected to the main pipe 110 and supplies heat transfer oil. The oil pump 300 is located in the main pipe 110 and between the oil tank 200 and the heat exchange pipe 120. The oil pump 300 is used to pump the heat transfer oil for circulation. The heating device 400 is located in the main pipe 110 and between the oil pump 300 and the heat exchange pipe 120. The heating device 400 is used to heat the heat transfer oil. The differential pressure flow meter is located in the main pipe 110 and between the oil pump 300 and the heating device 400. The heating device 400 and the differential pressure flow meter are electrically connected to the control system. The control system can control the switching of the heating device 400 according to the detection data of the differential pressure flow meter. Differential pressure flowmeters detect flow rate by measuring the pressure difference across the flowmeter. The control system can control the heating device 400 to stop heating based on the detection data of the differential pressure flowmeter to prevent accidents. The aforementioned differential pressure flowmeter is suitable for high-temperature environments and also for almost insulating heat transfer oils. It operates stably, and even if there are impurities in the pipeline, it will not affect the pressure detection, and it is not prone to false alarms. Therefore, it can more stably and reliably detect the flow of heat transfer oil.

[0032] Specifically, the oil tank 200 supplies heat transfer oil, and the oil pump 300 pumps the heat transfer oil to the heating device 400 for heating. The heated heat transfer oil is then transported to the heat exchange tube 120 to heat external equipment or media, and then transported back to the oil pump 300 for circulation. The control system can link the differential pressure flow meter with the heating device 400. The differential pressure flow meter has a simple structure, low cost, high reliability, and wide applicability. It is suitable for high-temperature scenarios and also for insulating heat transfer oil media. The differential pressure flow meter can detect the flow rate of the heat transfer oil, thereby indirectly detecting the flow status of the heat transfer oil. When the flow rate is too low, it can be determined that there is a blockage in the pipeline. The control system can then control the heating device 400 to stop heating to avoid overheating and high-temperature accidents. Furthermore, for low-precision flow detection, the presence of impurities in the pipeline will not affect the flow judgment. It has high reliability, reduces false alarms, and reduces downtime losses.

[0033] Reference Figures 1 to 3 In some embodiments of this utility model, the differential pressure flow meter is configured as an orifice plate flow meter 500. Specifically, the orifice plate flow meter 500 is heat-resistant and suitable for high-temperature heat transfer oil. The flow calculation formula of the orifice plate flow meter 500 is derived based on Bernoulli's equation and the continuity equation. The specific calculation formula is common knowledge and will not be described in detail here. The orifice plate flow meter 500 can reliably detect the flow of heat transfer oil.

[0034] Reference Figures 2 to 3 In some embodiments of this utility model, a first temperature sensor 410 is provided inside the heating device 400, and the first temperature sensor 410 is electrically connected to the control system. Specifically, the first temperature sensor 410 inside the heating device 400 can detect the heating temperature inside the heating device 400, and when the temperature is abnormal, the control system can promptly control the heating device 400 to stop heating.

[0035] Reference Figures 2 to 3 In some embodiments of this utility model, a second temperature sensor 420 is provided between the heating device 400 and the heat exchange tube 120, and the second temperature sensor 420 is electrically connected to the control system. Specifically, before the heat transfer oil output by the heating device 400 reaches the heat exchange tube 120, it is detected by the second temperature sensor 420. When the pipeline is blocked, the heat transfer oil does not flow, the temperature of the first temperature sensor 410 rises sharply, while the temperature rise of the second temperature sensor 420 is not significant. Through the control system, the temperature values ​​of the first temperature sensor 410 and the second temperature sensor 420 can be compared to determine whether the pipeline system is blocked, thereby stopping the heating device 400 from heating. Combined with a differential pressure flow meter, the protection scheme of this embodiment can have safety redundancy.

[0036] In some embodiments of this invention, the heating device 400 includes multiple heating rods, and a first temperature sensor 410 is positioned close to the heating rods. Specifically, the first temperature sensor 410 is positioned as close as possible to the heating rods to accurately detect the temperature inside the heating device 400, thereby enabling faster detection of overheating and greater safety.

[0037] Reference Figure 3 In some embodiments of this utility model, a furnace body 600 is also included, with multiple heat exchange tubes 120 arranged in parallel with the main pipe 110, and the heat exchange tubes 120 are located in the furnace body 600. Specifically, multiple heat exchange tubes 120 can be connected in parallel with the main pipe 110, and multiple heat exchange tubes 120 can be spirally connected to the periphery of the furnace body 600 to expand the heat exchange area and improve heating efficiency.

[0038] In some embodiments of this invention, the differential pressure flow meter senses a flow rate of Q1, and the rated flow rate is Q2. When Q1 < 0.3Q2, the control system can control the heating device 400 to stop heating. Specifically, when the detected flow rate Q1 is less than 30% of the rated flow rate Q2, it indicates that the heat transfer oil has very poor fluidity, and the pipeline system may experience blockage, damage to the oil pump 300, or malfunctions such as the corresponding valves being closed. The system enters a protection program, and the control system forcibly stops the heating device 400 from heating.

[0039] It is conceivable that when Q1 is less than 0.8Q2, the filter needs to be checked, whether the relevant valves are fully open, and the performance of the heat transfer oil pump 300 will decrease. If used for a long time, the oil may carbonize and deteriorate, but the equipment can still continue to be used.

[0040] Reference Figures 1 to 3 In some embodiments of this utility model, the orifice plate flow meter 500 includes a first pressure sensor 510, an orifice plate structure 520, and a second pressure sensor 530. The orifice plate structure 520 is connected to the main pipe 110. The first pressure sensor 510 is located at the input end of the orifice plate structure 520, and the second pressure sensor 530 is located at the output end of the orifice plate structure 520. Specifically, when fluid passes through the orifice plate structure 520, the flow channel contracts, leading to an increase in flow velocity and a decrease in pressure, creating a pressure difference across the orifice plate structure 520. The first pressure sensor 510 and the second pressure sensor 530 can detect this pressure difference. Based on Bernoulli's equation and the continuity equation, the flow rate Q can be derived.

[0041]

[0042] in,

[0043] Q is the fluid flow rate (volume / time), measured in cubic meters per second (m³ / s). 3 / s) or liters per second (L / s), etc.

[0044] C d It is the flow coefficient of the orifice plate structure, representing the influence of the orifice plate's design and geometry on flow measurement. It is a dimensionless constant whose value depends on the type, size, and installation method of the orifice plate.

[0045] A is the cross-sectional area of ​​the orifice plate, which is the effective area through which fluid flows, measured in square meters (㎡).

[0046] ΔP is the pressure difference when the fluid passes through the orifice plate, i.e., the pressure difference before and after the orifice plate, and the unit is Pascal (Pa).

[0047] ρ is the density of the fluid, with units such as kilograms per cubic meter (kg / m³). 3 ).

[0048] In some embodiments of this utility model, the first pressure sensor 510 detects a pressure value of P1, and the second pressure sensor 530 detects a pressure value of P2. When both P1 and P2 are greater than 0.3 MPa, the control system controls the heating device 400 to stop heating. Specifically, the first pressure sensor 510 and the second pressure sensor 530 can be used not only to deduce the flow rate but also to detect pipeline pressure. When the pipeline downstream of the flow meter becomes blocked, the pressure at the orifice plate flow meter 500 will increase. When the pressure values ​​detected by P1 and P2 are greater than 0.3 MPa, it can be confirmed that the pipeline is indeed blocked. At this time, the control system forcibly stops the heating device 400 to ensure the safety of the heating system.

[0049] In some embodiments of this invention, the first pressure sensor 510 detects a pressure value of P1, and the second pressure sensor 530 detects a pressure value of P2. When both P1 and P2 are less than 0.1 MPa, the control system controls the heating device 400 to stop heating. Specifically, when the orifice plate flow meter 500 is blocked, the pressure at the flow meter drops. When both P1 and P2 are less than 0.1 MPa, it can be confirmed that the flow meter is indeed blocked. At this time, the control system can forcibly control the heating device 400 to stop heating to ensure the safety of the heating system.

[0050] Understandably, the oil pump 300 can also be electrically connected to the control system. In the event of a blockage or overheating problem, the oil pump 300 can be stopped to prevent damage to the oil pump 300.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A heat transfer oil heating system, characterized in that, include: A circulating piping system, including interconnected main pipes (110) and heat exchange pipes (120); An oil tank (200) is connected to the main pipe (110), and the oil tank (200) supplies heat transfer oil. An oil pump (300) is provided in the main pipe (110) and located between the oil tank (200) and the heat exchange tube (120). The oil pump (300) is used to pump heat transfer oil for circulation. A heating device (400) is provided in the main pipe (110) and located between the oil pump (300) and the heat exchange tube (120). The heating device (400) is used to heat the heat transfer oil. A differential pressure flow meter is installed in the main pipe (110) and located between the oil pump (300) and the heating device (400); The control system is electrically connected to both the heating device (400) and the differential pressure flow meter. The control system can control the switching of the heating device (400) based on the detection data of the differential pressure flow meter.

2. The heat transfer oil heating system according to claim 1, characterized in that, The differential pressure flow meter is configured as an orifice plate flow meter (500).

3. The heat transfer oil heating system according to claim 1, characterized in that, The heating device (400) is equipped with a first temperature sensor (410), which is electrically connected to the control system.

4. The heat transfer oil heating system according to claim 3, characterized in that, A second temperature sensor (420) is provided between the heating device (400) and the heat exchange tube (120), and the second temperature sensor (420) is electrically connected to the control system.

5. The heat transfer oil heating system according to claim 4, characterized in that, The heating device (400) includes a plurality of heating rods, and the first temperature sensor (410) is disposed close to the heating rods.

6. The heat transfer oil heating system according to claim 1, characterized in that, It also includes a furnace body (600), wherein multiple heat exchange tubes (120) are provided, and each heat exchange tube (120) is arranged in parallel with the main tube (110), and the heat exchange tubes (120) are located in the furnace body (600).

7. The heat transfer oil heating system according to claim 1, characterized in that, The differential pressure flow meter senses a flow rate of Q1 and a rated flow rate of Q2. When Q1 < 0.3Q2, the control system can control the heating device (400) to stop heating.

8. The heat transfer oil heating system according to claim 2, characterized in that, The orifice plate flow meter (500) includes a first pressure sensor (510), an orifice plate structure (520), and a second pressure sensor (530). The orifice plate structure (520) is connected to the main pipe (110). The first pressure sensor (510) is located at the input end of the orifice plate structure (520), and the second pressure sensor (530) is located at the output end of the orifice plate structure (520).

9. A heat transfer oil heating system according to claim 8, characterized in that, The first pressure sensor (510) detects a pressure value of P1, and the second pressure sensor (530) detects a pressure value of P2. When both P1 and P2 are greater than 0.3 MPa, the control system controls the heating device (400) to stop heating.

10. A heat transfer oil heating system according to claim 8, characterized in that, The first pressure sensor (510) detects a pressure value of P1, and the second pressure sensor (530) detects a pressure value of P2. When both P1 and P2 are less than 0.1 MPa, the control system controls the heating device (400) to stop heating.

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