Connection method for core wires of petroleum pipe electric heating device

Abstract

The invention belongs to the technical field of petroleum pipes, and particularly relates to a connection method for a core wire of a petroleum pipe electric heating device. A connection method for a core wire of an electric heating device of a petroleum pipe comprises the following steps that a matched connector is selected, the connector can bear the working pressure and temperature of the electric heating device, and high-temperature-resistant treatment is conducted on the surface of the connector; stripping an insulating layer of the core wire, stripping the core wire of the petroleum pipe electric heating device from the pipe, and stripping the insulating layer on the outer side of the core wire at the same time; fixing the joint, and inserting the core wire into the joint; the closed joint is used for closing the joint inserted into the core wire; and finishing the connection of the core wires after the inspection is qualified. According to the invention, the surface of the joint is coated with the temperature-resistant epoxy glue and then is coated with the multiple layers of PET adhesive tapes, so that the high-temperature resistance of the joint is improved, the joint cannot be broken down or damaged due to overheating, the safe operation of the electric heating device is ensured, the probability of equipment failure is effectively reduced, and the service life of the joint in a high-temperature environment is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum pipes, and in particular relates to a method for connecting core wires of an electric heating device for petroleum pipes. Background Art

[0002] Petroleum pipes are seamless steel pipes suitable for furnace tubes, heat exchangers and pipelines in oil refineries. They are widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames, and steel scaffolding used in construction. The core wire of the electric heating device is the core component of the electric heating device, mainly including electric heating wire, electric heating tube, electric heating plate, etc.

[0003] During the oil production and transportation process, crude oil generally needs to be heated and insulated to reduce its viscosity and facilitate transportation or delivery. Oil heating devices generally include direct heating furnaces and indirect heating furnaces. In direct heating furnaces, crude oil pipes pass directly through the furnace hearth. The heat generated by fuel combustion exchanges heat with the crude oil pipes in the furnace hearth through radiation and convection. Because there is no intermediate heat transfer medium, the efficiency of converting fuel into crude oil heat is higher than that of indirect heating furnaces. Indirect heating furnaces first heat a heat transfer medium (thermal oil) and then exchange heat with the crude oil through a crude oil heat exchanger to achieve the purpose of heating the crude oil.

[0004] The core wire joints of existing electric heating devices will experience problems such as core wire aging, breakage, and poor contact after being used in a high-temperature environment for a long time. Once a problem occurs, the heating device will not work properly and the oil will eventually solidify in the pipeline, affecting oil transportation. Summary of the Invention

[0005] In response to the above problems, the purpose of the present invention is to provide a method for connecting the core wires of an electric heating device for petroleum pipes. This method improves the high-temperature resistance of the joint by applying heat-resistant epoxy glue on the surface of the joint and then wrapping it with multiple layers of PET tape, so that the joint will not malfunction or be damaged due to overheating, thereby ensuring the safe operation of the electric heating device, effectively reducing the probability of equipment failure, and increasing the service life of the joint in a high-temperature environment.

[0006] The technical solution of the present invention is: a method for connecting core wires of an electric heating device for petroleum tubing, comprising the following steps: S1: Select an appropriate joint that can withstand the working pressure and temperature of the electric heating device, and perform high-temperature resistant treatment on the joint surface; S2: stripping the insulation layer of the core wire, stripping the core wire of the oil pipe electric heating device from the pipe, and stripping the insulation layer on the outside of the core wire at the same time; S3: Fix the connector and insert the core wire into the connector; S4: Close the joint, close the joint with the inserted core wire; S5: Complete the connection of the core wires after passing the inspection.

[0007] In step S1, the joint can withstand the working pressure range of the electric heating device of 800HPa-1000HPa, and the joint can withstand the working temperature range of the electric heating device of 100°C-300°C.

[0008] The step S1 of performing high temperature resistant treatment on the joint surface specifically includes: S11: applying heat-resistant epoxy glue to the joint surface. The heat-resistant epoxy glue comprises epoxy resin and curing agent. When used, the epoxy resin and curing agent are mixed and stirred in a weight percentage ratio of 2:1. The chemical component of the curing agent is polyethylene polyamine. S12: Apply heat-resistant epoxy adhesive to the joint surface and then wrap it with multiple layers of PET tape.

[0009] The working temperature range of the heat-resistant epoxy adhesive is 200°C-300°C, and the temperature-resistant range of the PET tape is -40°C-150°C.

[0010] In step S2, the insulation layer of the core wire is stripped manually. The specific process is: the operator uses wire strippers, shackle pliers, and a rotary cutter to manually strip the insulation layer of the core wire. By manually stripping the insulation layer, the connector directly contacts the metal part of the core wire.

[0011] In step S3, the connector is fixed, and the core wires with the insulation layers stripped off are vertically inserted into the connector in sequence.

[0012] In step S4, the joint is closed and the core wire is wrapped with a heat shrink tube. Specifically, a heat shrink tube of appropriate length is cut and inserted into the core wire and moved to an appropriate position. Then, the heat shrink tube is heated using an oven, a hot air gun or a hair dryer. The heating direction is to move the heat shrink tube unidirectionally from left to right or from right to left. The temperature range of the heat shrink tube heating is 70°C-100°C.

[0013] The inspection in step S5 includes the integrity of the core wire, the tightness of the interface, and whether the joint can withstand the working pressure and temperature of the electric heating device.

[0014] The process of checking whether the joint can withstand the working pressure of the electric heating device is as follows: S511: Select the specified pressure measuring instrument; S512: Turn on the electric heating device to heat the oil pipe and measure the pressure at the joint at the same time. The measurement can be performed on both sides or one side of the joint. S513: Install the pressure measuring instrument at the determined position and record the pressure value change of the joint; S514: Compare the measured pressure value with the normal working pressure range to determine whether there is any abnormal pressure.

[0015] The process of checking whether the joint can withstand the operating temperature of the electric heating device is as follows: S521: Select a specified temperature measuring instrument or infrared thermometer to measure the temperature; S522: Turn on the electric heating device to heat the oil pipe and measure the temperature of the surface or interior of the joint at the same time; S523: Install the temperature measuring instrument at the determined position and record the temperature value of the joint; S524: Compare the measured temperature value with the normal operating temperature range to determine whether there is a temperature abnormality.

[0016] The technical effects of the present invention are: 1. The present invention improves the high-temperature resistance of the joint by coating the joint surface with heat-resistant epoxy glue and then wrapping it with multiple layers of PET tape, so that the joint will not malfunction or be damaged due to overheating, thereby ensuring the safe operation of the electric heating device, effectively reducing the probability of equipment failure, and increasing the service life of the joint in a high-temperature environment; 2. The present invention can better ensure the connection strength between the core wire and the joint by vertically inserting the core wire into the joint in sequence, making it less likely to fall off or loosen, reducing contact resistance, and improving the electrical performance of the connection device. At the same time, vertically inserting the joint can complete the installation more quickly and accurately without the need for excessive Adjust or process the core wire. When the core wire or joint needs to be replaced or repaired, the vertically inserted core wire is easier to take out from the joint; 3. The present invention can effectively protect the core wire from external interference and damage by using a heat shrink tube to seal the joint, and effectively prevent short circuits between the core wires. At the same time, the heat shrink tube has excellent insulation performance and high temperature resistance, and can be used in high temperature environments to protect the core wire from wear and other sources of danger. The heat shrink tube has a high shrinkage rate and can be made into various shapes as needed, so that the core wire is evenly protected, enhancing the reliability and safety of the wiring. After using the heat shrink tube to seal the joint, the appearance of the electronic wiring harness can be made more beautiful and neat.

[0017] The following is a further description with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flowchart of a method for connecting core wires of an electric heating device for petroleum tubing according to an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the working pressure detection process according to an embodiment of the present invention.

[0020] Figure 3 The figure is a schematic diagram of the working temperature detection process according to an embodiment of the present invention. DETAILED DESCRIPTION Example 1

[0021] like Figure 1 As shown, a method for connecting core wires of an electric heating device for petroleum tubing includes the following steps: S1: Select an appropriate joint that can withstand the working pressure and temperature of the electric heating device, and perform high-temperature resistant treatment on the joint surface; S2: stripping the insulation layer of the core wire, stripping the core wire of the oil pipe electric heating device from the pipe, and stripping the insulation layer on the outside of the core wire at the same time; S3: Fix the connector and insert the core wire into the connector; S4: Close the joint, close the joint with the inserted core wire; S5: Complete the connection of the core wires after passing the inspection.

[0022] In step S1, the joint can withstand the working pressure range of the electric heating device of 800HPa-1000HPa, and the joint can withstand the working temperature range of the electric heating device of 100°C-300°C.

[0023] The step S1 of performing high temperature resistant treatment on the joint surface specifically includes: S11: applying heat-resistant epoxy glue to the joint surface. The heat-resistant epoxy glue comprises epoxy resin and curing agent. When used, the epoxy resin and curing agent are mixed and stirred in a weight percentage ratio of 2:1. The chemical component of the curing agent is polyethylene polyamine. S12: Apply heat-resistant epoxy adhesive to the joint surface and then wrap it with multiple layers of PET tape.

[0024] The working temperature range of the heat-resistant epoxy adhesive is 200°C-300°C, and the temperature-resistant range of the PET tape is -40°C-150°C.

[0025] The pressure value that the joint of the present invention can withstand is 900HPa-1000HPa. The high-temperature resistant treatment of the joint surface is to apply heat-resistant epoxy glue. The materials of the heat-resistant epoxy glue are epoxy resin and curing agent. The ratio between the epoxy resin and the curing agent is 2:1. After the heat-resistant epoxy glue is applied to the joint surface, it is wrapped with multiple layers of PET tape. The advantage is that, through the above technical solution, by requiring the joint to withstand a pressure value of 1000HPa, the operating pressure of the joint of the electric heater device is prevented from being lower than the operating pressure of the system, which may cause leakage at the interface. If the leakage is serious, it will affect the heating efficiency, increase energy loss, and even damage the electric heater itself. By applying a heat-resistant epoxy adhesive on the surface of the joint, the operating temperature of the heat-resistant epoxy adhesive is between 200°C and 300°C, which has the effect of resisting high temperatures. By mixing the epoxy resin and the curing agent in a ratio of 2:1, a heat-resistant epoxy adhesive with strong adhesion, low shrinkage, and strong corrosion resistance is obtained. Finally, the joint surface coated with the heat-resistant epoxy adhesive is wrapped with multiple layers of PET tape. The PET tape has a temperature resistance range of between -40°C and 150°C, which can further improve the high-temperature resistance of the joint. This prevents the joint from malfunctioning or being damaged due to overheating, ensures the safe operation of the electric heater, and effectively reduces the probability of equipment failure.

[0026] In step S2, the insulation layer of the core wire is stripped manually. The specific process is: the operator uses wire strippers, shackle pliers, and a rotary cutter to manually strip the insulation layer of the core wire. By manually stripping the insulation layer, the connector directly contacts the metal part of the core wire.

[0027] The method for stripping the insulation layer of the core wire of the present invention is manual stripping. The operator uses wire strippers, shackle pliers, and a rotary cutter to manually strip the insulation layer of the core wire. During the operation, care is taken not to damage the wire core and to ensure that the insulation layer is stripped cleanly. The advantage is that by manually stripping the insulation layer, the operation can be performed more carefully, avoiding damage to the core wire and affecting the use of the electric heating equipment. At the same time, stripping the insulation layer allows the connector to directly contact the metal part, improving contact reliability, reducing resistance, and making current transmission smoother. If the connector fails and needs to be repaired or replaced, the presence of the insulator will increase the difficulty of the operation, while stripping the insulator can facilitate repair and replacement.

[0028] In step S3, the connector is fixed, and the core wires with the insulation layers stripped off are vertically inserted into the connector in sequence.

[0029] The present invention can better ensure the connection strength between the core wire and the connector by vertically inserting the core wire into the connector in sequence, making it less likely to fall off or loosen, reducing contact resistance, and improving the electrical performance of the connecting device. At the same time, vertically inserting the connector can complete the installation more quickly and accurately without the need for excessive adjustment or processing of the core wire. When the core wire or connector needs to be replaced or repaired, the vertically inserted core wire is easier to remove from the connector.

[0030] In step S4, the joint is closed and the core wire is wrapped with a heat shrink tube. Specifically, a heat shrink tube of appropriate length is cut and inserted into the core wire and moved to an appropriate position. Then, the heat shrink tube is heated using an oven, a hot air gun or a hair dryer. The heating direction is to move the heat shrink tube unidirectionally from left to right or from right to left. The temperature range of the heat shrink tube heating is 70°C-100°C.

[0031] The present invention can effectively protect the core wire from external interference and damage by using heat shrink tube to seal the joint, and effectively prevent short circuit between the core wires. At the same time, the heat shrink tube has excellent insulation performance and high temperature resistance, and can be used in high temperature environment to protect the wire from wear and other dangerous sources. The heat shrink tube has a high shrinkage rate and can be made into various shapes as needed, so that the wire is evenly protected and the reliability and safety of the wiring are enhanced. After using the heat shrink tube to seal the joint, the appearance of the electronic wiring harness can be made more beautiful and neat.

[0032] The inspection in step S5 includes the integrity of the core wire, the tightness of the interface, and whether the joint can withstand the working pressure and temperature of the electric heating device.

[0033] The present invention performs a power supply integrity check by connecting the core wire connector and carefully observing whether the wire is damaged, cracked or broken. The integrity of the core wire directly affects whether the equipment can be used normally. The tightness of the interface is checked to prevent the electric heating device from suddenly falling off during use due to loosening or falling off due to unstable fixation of the interface, thereby preventing damage to the machine.

[0034] like Figure 2 As shown, the process of checking whether the joint can withstand the working pressure of the electric heating device is as follows: S511: Select the specified pressure measuring instrument; S512: Turn on the electric heating device to heat the oil pipe and measure the pressure at the joint at the same time. The measurement can be performed on both sides or one side of the joint. S513: Install the pressure measuring instrument at the determined position and record the pressure value change of the joint; S514: Compare the measured pressure value with the normal working pressure range to determine whether there is any abnormal pressure.

[0035] The present invention can verify the reliability of the connection strength of the joint by detecting the working voltage of the joint when the electric heating device is running, and test whether the joint can withstand normal operating pressure. If the connection strength is insufficient, the joint will become loose or fall off, affecting the normal operation of the entire heating device. By observing the working status and detection data of the joint, it can be determined whether there is a potential fault in the joint. If an abnormality is found, measures can be taken in time to repair and replace it to ensure the temperature operation of the electric heating device.

[0036] like Figure 3 As shown, the process of checking whether the joint can withstand the operating temperature of the electric heating device is as follows: S521: Select a specified temperature measuring instrument or infrared thermometer to measure the temperature; S522: Turn on the electric heating device to heat the oil pipe and measure the temperature of the surface or interior of the joint at the same time; S523: Install the temperature measuring instrument at the determined position and record the temperature value of the joint; S524: Compare the measured temperature value with the normal operating temperature range to determine whether there is a temperature abnormality.

[0037] The present invention monitors the working temperature of the joint when the electric heating device is running, so as to understand the working status of the joint, detect abnormal conditions in time and take measures to ensure the safety of the electric heating device. Under high temperature conditions, the temperature of the outer surface of the joint is overheated, which may cause fire and other safety problems. Therefore, by checking the working temperature of the joint, such accidents can be prevented.

[0038] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A method for connecting core wires of an electric heating device for petroleum tubing, characterized in that: The following steps are involved: S1: Select an appropriate joint that can withstand the working pressure and temperature of the electric heating device, and perform high-temperature resistant treatment on the joint surface; S2: stripping the insulation layer of the core wire, stripping the core wire of the oil pipe electric heating device from the pipe, and stripping the insulation layer on the outside of the core wire at the same time; S3: Fix the connector and insert the core wire into the connector; S4: Close the joint, close the joint with the inserted core wire; S5: Complete the connection of the core wires after passing the inspection.

2. A method for connecting core wires of an electric heating device for petroleum tubing according to claim 1, characterized in that: In step S1, the joint can withstand the working pressure range of the electric heating device of 800HPa-1000HPa, and the joint can withstand the working temperature range of the electric heating device of 100°C-300°C.

3. A method for connecting core wires of an electric heating device for petroleum tubing according to claim 1, characterized in that: The step S1 of performing high temperature resistant treatment on the joint surface specifically includes: S11: applying heat-resistant epoxy glue to the joint surface. The heat-resistant epoxy glue comprises epoxy resin and curing agent. When used, the epoxy resin and curing agent are mixed and stirred in a weight percentage ratio of 2:

1. The chemical component of the curing agent is polyethylene polyamine. S12: Apply heat-resistant epoxy adhesive to the joint surface and then wrap it with multiple layers of PET tape.

4. A method for connecting core wires of an electric heating device for petroleum tubing according to claim 3, characterized in that: The working temperature range of the heat-resistant epoxy adhesive is 200°C-300°C, and the temperature-resistant range of the PET tape is -40°C-150°C.

5. The method for connecting core wires of an electric heating device for petroleum tubing according to claim 1, characterized in that: In step S2, the insulation layer of the core wire is stripped manually. The specific process is: the operator uses wire strippers, shackle pliers, and a rotary cutter to manually strip the insulation layer of the core wire. By manually stripping the insulation layer, the connector directly contacts the metal part of the core wire.

6. A method for connecting core wires of an electric heating device for petroleum tubing according to claim 1, characterized in that: In step S3, the connector is fixed, and the core wires with the insulation layers stripped off are vertically inserted into the connector in sequence.

7. The method for connecting core wires of an electric heating device for petroleum tubing according to claim 1, characterized in that: In step S4, the joint is closed and the core wire is wrapped with a heat shrink tube. Specifically, a heat shrink tube of appropriate length is cut and inserted into the core wire and moved to an appropriate position. Then, the heat shrink tube is heated using an oven, a hot air gun or a hair dryer. The heating direction is to move the heat shrink tube unidirectionally from left to right or from right to left. The temperature range of the heat shrink tube heating is 70°C-100°C.

8. The method for connecting core wires of an electric heating device for petroleum tubing according to claim 1, characterized in that: The inspection in step S5 includes the integrity of the core wire, the tightness of the interface, and whether the joint can withstand the working pressure and temperature of the electric heating device.

9. A method for connecting core wires of an electric heating device for petroleum tubing according to claim 8, characterized in that: The process of checking whether the joint can withstand the working pressure of the electric heating device is as follows: S511: Select the specified pressure measuring instrument; S512: Turn on the electric heating device to heat the oil pipe and measure the pressure at the joint at the same time. The measurement can be performed on both sides or one side of the joint. S513: Install the pressure measuring instrument at the determined position and record the pressure value change of the joint; S514: Compare the measured pressure value with the normal working pressure range to determine whether there is any abnormal pressure.

10. A method for connecting core wires of an electric heating device for petroleum tubing according to claim 8, characterized in that: The process of checking whether the joint can withstand the operating temperature of the electric heating device is as follows: S521: Select a specified temperature measuring instrument or infrared thermometer to measure the temperature; S522: Turn on the electric heating device to heat the oil pipe and measure the temperature of the surface or interior of the joint at the same time; S523: Install the temperature measuring instrument at the determined position and record the temperature value of the joint; S524: Compare the measured temperature value with the normal operating temperature range to determine whether there is a temperature abnormality.

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