A welding device for single point liquid ring seal ring

Abstract

The application discloses a kind of welding devices for single point liquid slip ring sealing ring, sealing cabin, welding mechanism, clamping mechanism, transmission mechanism and control unit;Welding mechanism is arranged inside welding cabin;Clamping mechanism includes fixed clamping end, movable clamping end and clamp, fixed clamping end is fixedly arranged in one side of welding mechanism, movable clamping end is slidably arranged in the other side of welding mechanism, and the clamp is detachably arranged on the fixed clamping end and / or movable clamping end;Transmission mechanism includes screw rod transmission assembly, slide rail and servo motor, the slide rail is fixed to the bottom of the sealing cabin, the movable clamping end is slidably installed on the slide rail, the output end of the servo motor is fixedly connected with the screw rod transmission assembly, the output end of the screw rod transmission assembly is fixedly connected with the movable clamping end, the servo motor is electrically connected with the control unit, the servo motor drives the screw rod transmission assembly to drive the movable clamping end to move along the slide rail and provide stable pressure, improve the welding quality.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering equipment maintenance technology, and particularly relates to a welding device for a single-point liquid slip ring seal. Background Technology

[0002] Single-point mooring systems are critical facilities for offshore oil and gas exploration and transshipment. The liquid slip rings within these systems, serving as the core equipment for fluid transfer between the fixed structure and rotating floating units (such as FPSOs and oil tankers), endure high pressure, corrosion, and alternating loads over extended periods. Slip ring failure can lead to crude oil or chemical leaks, causing production shutdowns, environmental pollution, and even safety accidents. In actual service, corrosion, wear, and high-temperature aging of the sealing rings (especially PTFE custom-shaped sealing rings) are the main causes of slip ring leakage.

[0003] Currently, the most common repair method for damaged sealing rings is complete replacement, which is costly, requires reliance on foreign suppliers, and has a long replacement cycle. In recent years, in-situ welding repair technology has emerged, but there is a lack of specialized equipment, and the high humidity and high salinity environment of the marine environment can easily affect the welding quality during on-site operations.

[0004] Therefore, there is an urgent need to design a welding device for single-point liquid slip ring seals to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide a welding device for single-point liquid slip ring seals to improve welding quality.

[0006] To achieve the above objectives, the specific technical solution of the welding device for a single-point liquid slip ring seal according to the present invention is as follows: A welding device for a single-point liquid slip ring seal includes: a sealing chamber, a welding mechanism, a clamping mechanism, a transmission mechanism, and a control unit; The welding mechanism is located inside the welding chamber; The clamping mechanism includes a fixed clamping end, a movable clamping end, and a clamp. The fixed clamping end is fixedly disposed on one side of the welding mechanism, and the movable clamping end is slidably disposed on the other side of the welding mechanism. The clamp is detachably disposed on the fixed clamping end and / or the movable clamping end, and is used to clamp the joint of the sealing ring to be welded. The transmission mechanism includes a screw drive assembly, a slide rail, and a servo motor. The slide rail is fixed to the bottom of the sealed chamber. The movable clamping end is slidably mounted on the slide rail. The output end of the servo motor is fixedly connected to the screw drive assembly, and the output end of the screw drive assembly is fixedly connected to the movable clamping end. The servo motor is electrically connected to the control unit. The control unit controls the servo motor to drive the screw drive assembly to move the movable clamping end along the slide rail.

[0007] Furthermore, both the fixed clamping end and the movable clamping end are provided with arc-shaped guide rails, and the clamp is slidably mounted on the arc-shaped guide rails so that the connector can rotate along the arc-shaped guide rails.

[0008] Furthermore, the clamp includes a wedge block and a groove block, the wedge block and the groove block cooperating, and the connector being snapped between the wedge block and the groove block to prevent the connector from sliding backward during the welding pressure process.

[0009] Furthermore, the welding mechanism includes a lower base, a top cover, a heating coil, a heat dissipation component, a heat insulation component, a heat conduction component, and a temperature sensor; The lower base is fixedly installed at the bottom of the sealed chamber, and the top cover of the base is fixedly connected to the top of the lower base; The heating coil is fixedly installed between the lower base and the top cover of the base, and is electrically connected to the control unit; Heat dissipation components are fixedly provided on the left and right sides of the heat-conducting component, and the heat insulation component is fixedly connected between the heat dissipation component and the heat-conducting component. The heat-conducting component is in contact with the outer surface of the connector for heat conduction. The temperature sensor is mounted on the heat-conducting component or the heating coil and is electrically connected to the control unit.

[0010] Furthermore, a feed inlet is provided on the side wall of the sealed chamber, and a closable sealing cover is provided at the feed inlet.

[0011] Furthermore, both the heat dissipation component and the heat insulation component are upper and lower parts, which are clamped together by the heating coil.

[0012] Furthermore, the transmission mechanism also includes a pressure sensor and a displacement sensor, which are integrated into the servo motor. Both the pressure sensor and the displacement sensor are electrically connected to the control unit, and the control unit controls the servo motor to operate based on the information from the pressure sensor and the displacement sensor.

[0013] Furthermore, the sides and top of the sealed chamber are openable doors, and the doors are sealed to the main body of the chamber by sealing strips.

[0014] Furthermore, the sealed chamber is provided with a protective gas inlet, which is connected to an external gas source through a pipeline; the sealed chamber is also provided with a pressure sensor, which is fixedly installed on the inner wall of the sealed chamber and electrically connected to the control unit.

[0015] The welding device for single-point liquid slip ring seals of the present invention has the following advantages: Through the integrated design of the sealing chamber, welding mechanism, clamping mechanism, transmission mechanism, and control unit, the coordinated operation of in-situ clamping, axial pressurization, and controllable heating of the seal joint is realized. The movable clamping end is driven by a servo motor to slide along the slide rail, which can precisely control the docking pressure and stroke, avoiding the instability of manual operation; the sealing chamber can isolate the external marine environment, providing a clean and controllable space for welding, significantly improving the welding quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the welding device for a single-point liquid slip ring seal according to the present invention; Figure 2 This is a partial structural schematic diagram of the welding device for a single-point liquid slip ring seal according to the present invention; Figure 3 This is a partial structural cross-sectional view of the welding device for a single-point liquid slip ring seal according to the present invention; Figure 4 This is a schematic diagram of the clamping mechanism of the welding device for a single-point liquid slip ring seal of the present invention.

[0017] Explanation of markings in the diagram: 1. Sealed chamber; 11. Feed inlet; 12. Protective gas inlet; 13. Pressure sensor; 2. Welding mechanism; 21. Lower base; 22. Top cover; 23. Heating coil; 24. Heat dissipation assembly; 25. Heat insulation assembly; 26. Heat conduction assembly; 27. Temperature sensor; 3. Clamping mechanism; 31. Fixed clamping end; 32. Movable clamping end; 33. Fixture; 331. Wedge block; 332. Groove block; 333. Arc-shaped slider; 4. Transmission mechanism; 41. Screw transmission assembly; 42. Slide rail; 43. Servo motor; 5. Control unit; 6. Control wiring harness; 7. Connector. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0020] The following is a reference to the appendix. Figure 1 To be continued Figure 4 This invention describes a welding device for a single-point liquid slip ring seal.

[0021] like Figures 1 to 4 As shown, a welding device for a single-point liquid slip ring seal includes: a sealing chamber 1, a welding mechanism 2, a clamping mechanism 3, a transmission mechanism 4, and a control unit 5. The welding mechanism 2 is located inside the welding chamber; The clamping mechanism 3 includes a fixed clamping end 31, a movable clamping end 32, and a clamp 33. The fixed clamping end 31 is fixedly disposed on one side of the welding mechanism 2, the movable clamping end 32 is slidably disposed on the other side of the welding mechanism 2, and the clamp 33 is detachably disposed on the fixed clamping end 31 and / or the movable clamping end 32 for clamping the connector 7 of the sealing ring to be welded. The transmission mechanism 4 includes a screw drive assembly 41, a slide rail 42, and a servo motor 43. The slide rail 42 is fixed to the bottom of the sealed chamber 1. The movable clamping end 32 is slidably mounted on the slide rail 42. The output end of the servo motor 43 is fixedly connected to the screw drive assembly 41, and the output end of the screw drive assembly 41 is fixedly connected to the movable clamping end 32. The servo motor 43 is electrically connected to the control unit 5. The control unit 5 controls the servo motor 43 to drive the screw drive assembly 41 to move the movable clamping end 32 along the slide rail 42.

[0022] In this embodiment, the integrated design of the sealed chamber 1, welding mechanism 2, clamping mechanism 3, transmission mechanism 4, and control unit 5 enables the coordinated operation of in-situ clamping, axial pressurization, and controllable heating of the sealing ring joint 7. The movable clamping end 32 is driven by a servo motor 43 to slide along the slide rail 42 via a screw transmission assembly 41, which can precisely control the docking pressure and stroke, avoiding the instability of manual operation. The sealed chamber 1 can isolate the external marine environment, providing a clean and controllable space for welding, significantly improving the welding quality.

[0023] Specifically, the control unit 5 can be integrated outside the cabin and connected via the control wiring harness 6. The sealed cabin 1 has a box-type structure.

[0024] Furthermore, both the fixed clamping end 31 and the movable clamping end 32 are provided with arc-shaped guide rails, and the clamp 33 is slidably mounted on the arc-shaped guide rails so that the connector 7 can rotate along the arc-shaped guide rails.

[0025] In this embodiment, the arc-shaped guide rail enables the clamp 33 to rotate the connector 7 within a 180° range, which facilitates the operator to adjust the welding angle or flexibly change the orientation of the connector 7 when performing multi-segment welding, thereby improving the adaptability of the device to different working conditions.

[0026] Furthermore, such as Figure 4 As shown, the clamp includes a wedge block 331 and a groove block 332. The wedge block 331 and the groove block 332 cooperate with each other, and the connector 7 is snapped between the wedge block 331 and the groove block 332 to prevent the connector 7 from sliding in the opposite direction during the welding pressure process.

[0027] In this embodiment, the wedge-shaped anti-slip structure of the wedge block 331 and the fitting design of the inclined surface of the groove block 332 can effectively prevent the sealing ring joint 7 from sliding backward due to axial pressure during the welding pressure process, ensuring that the mating surfaces always maintain tight contact, preventing welding misalignment, and thus ensuring the consistency of the welding of the joint 7.

[0028] Specifically, the fixed clamping end 31 is fixedly disposed on the left side of the welding mechanism 2, and the movable clamping end 32 is slidably disposed on the right side of the welding mechanism 2. The clamp 33 is a detachable assembly structure composed of the wedge block 331 and the groove block 332. The cross-section of the inner cavity of the groove block 332 is perfectly matched with the cross-section of the polytetrafluoroethylene sealing ring to be welded. The wedge block 331 and the groove block 332 are fixed by positioning pins and screws. Arc-shaped guide rails are machined on the opposite surfaces of the fixed clamping end 31 and the movable clamping end 32. Corresponding arc-shaped sliders 333 are provided on the back of the wedge block 331 and the groove block 332, allowing the clamp 33 to rotate within a certain angle range (maximum 180°) along the arc-shaped guide rails. The inclined surfaces of the wedge block 331 and the groove block 332 are tightly fitted, and the wedge structure generates a self-locking effect when the axial pressure increases.

[0029] Furthermore, the welding mechanism 2 includes a lower base 21, a top cover 22, a heating coil 23, a heat dissipation component 24, a heat insulation component 25, a heat conduction component 26, and a temperature sensor 27; The lower base 21 is fixedly installed at the bottom of the sealed chamber 1, and the base top cover 22 is fixedly connected to the upper part of the lower base 21; The heating coil 23 is fixedly installed between the lower base 21 and the base top cover 22, and is electrically connected to the control unit 5; Heat dissipation components 24 are fixedly provided on the left and right sides of the heat conduction component 26, and the heat insulation component 25 is fixedly connected between the heat dissipation component 24 and the heat conduction component 26. The heat conduction component 26 contacts the connector 7 for heat conduction. The temperature sensor 27 is mounted on the heat-conducting component 26 or the heating coil 23 and is electrically connected to the control unit 5.

[0030] In this embodiment, the welding mechanism 2 uses a control unit 5 to control the annular heating ring 23 in conjunction with the heat-conducting component 26 to directly and uniformly heat the joint 7 circumferentially. The layered arrangement of the heat dissipation component 24 and the heat insulation component 25 ensures energy concentration in the heating area and prevents heat from being conducted to the clamping ends on both sides, which could lead to overheating of the clamp 33 or uncontrolled thermal deformation of the sealing ring. The temperature sensor 27 monitors the temperature of the heat-conducting component 26 in real time, enabling precise closed-loop control of the heating temperature.

[0031] Specifically, the welding mechanism 2 is located slightly below the center inside the sealed chamber 1. The heat dissipation assembly 24 includes a left-side heat dissipation assembly 24 and a right-side heat dissipation assembly 24, and the heat insulation assembly 25 includes a left-side heat insulation assembly 25 and a right-side heat insulation assembly 25. The lower base 21 is bolted to the bottom of the sealed chamber 1, and the top cover 22 is bolted to the upper part of the lower base 21. An annular heating coil 23 is clamped and fixed between the lower base 21 and the top cover 22, and a heating coil is arranged inside it. The left-side and right-side heat dissipation assemblies 24 are respectively fixed by the annular heating coil 23. The left-side heat insulation assembly 25 is fixed to the right side of the left-side heat dissipation assembly 24, and the right-side heat insulation assembly 25 is fixed to the left side of the right-side heat dissipation assembly 24. The heat dissipation assembly 24 is made of pure copper, and the heat insulation assembly 25 is made of zirconia ceramic. The heat-conducting component 26 is made of pure copper. The inner shapes of the heat dissipation component 24, the heat insulation component 25, and the heat-conducting component 26 are all adapted to the outer surface of the sealing ring connector 7. The heat-conducting component 26 is detachably embedded in the inner ring of the annular heating ring 23. The temperature sensor 27 is a type K thermocouple, which is mounted on the heat-conducting component 26 and electrically connected to the control unit 5 through the control wiring harness 6.

[0032] Furthermore, a feed inlet 11 is provided on the side wall of the sealed chamber 1, and a closable sealing cover is provided at the feed inlet 11.

[0033] In this embodiment, the design of the inlet 11 and the sealing cap allows the sealing ring connector 7 to be quickly inserted into the chamber without opening the entire door, which is convenient for operation, reduces the escape of protective gas, and maintains the stability of the protective atmosphere inside the chamber.

[0034] Furthermore, both the heat dissipation component 24 and the heat insulation component 25 are divided into upper and lower parts, which are clamped together by the heating coil 23.

[0035] In this embodiment, the heat dissipation component 24 and the heat insulation component 25 are separate upper and lower parts and clamped by the heating ring 23, which facilitates disassembly and maintenance. At the same time, the corresponding heat conduction component 26, heat insulation component 25 and heat dissipation component 24 can be replaced for different specifications of sealing rings, without having to replace the entire welding mechanism 2, thus reducing the cost of use.

[0036] Furthermore, the transmission mechanism 4 also includes a pressure sensor and a displacement sensor, which are integrated into the servo motor 43. Both the pressure sensor and the displacement sensor are electrically connected to the control unit 5, and the control unit 5 controls the operation of the servo motor 43 based on the information from the pressure sensor and the displacement sensor.

[0037] In this embodiment, the introduction of pressure and displacement sensors, together with the control unit 5, forms a pressure-displacement closed-loop control, which can monitor the axial pressure value and the moving distance of the movable clamping end 32 in real time, and automatically adjust the output of the servo motor 43 according to the preset welding process curve to achieve high-quality welding under low pressure, avoiding the sealing ring from breaking due to excessive pressure or the welding not being firm due to insufficient pressure.

[0038] Specifically, the slide rail 42 is a linear guide rail, fixed to the bottom of the sealed chamber 1 by screws. A slider is installed at the bottom of the movable clamping end 32, which slides in engagement with the slide rail 42. The servo motor 43 is a high-precision servo motor, its base fixed to the inner right wall of the sealed chamber 1. The output shaft of the servo motor 43 is fixedly connected to the screw end of the screw drive assembly 41 via a coupling. The servo motor 43, pressure sensor, and displacement sensor are all electrically connected to the control unit 5 via the control wiring harness 6.

[0039] Optionally, the pressure sensor and the displacement sensor are also disposed outside the servo motor.

[0040] Furthermore, the sides and top of the sealed chamber 1 are openable doors, and the doors are sealed to the main body of the chamber by a sealing strip.

[0041] In this embodiment, the openable doors on the side and top facilitate cleaning of the equipment interior, replacement of the clamp 33, and maintenance of the welding mechanism 2; the sealing strip ensures that the chamber is in a good sealed state during welding, preventing external moisture and salt spray from entering.

[0042] Specifically, the sealing strip is made of silicone rubber.

[0043] Furthermore, the sealed chamber 1 is provided with a protective gas inlet 12, which is connected to an external gas source through a pipeline; the sealed chamber 1 is also provided with a pressure sensor 13, which is fixedly installed on the inner wall of the sealed chamber 1 and electrically connected to the control unit 5.

[0044] In this embodiment, the protective gas inlet 12 can be vented with inert gases such as nitrogen. Combined with the pressure sensor 13 to monitor the cabin pressure in real time, it can actively expel the air inside the cabin, forming a stable positive pressure protective atmosphere. This effectively prevents the polytetrafluoroethylene material from oxidizing and degrading during high-temperature welding, while also isolating the humid and high-salt marine environment from affecting the welding interface.

[0045] Specifically, the sealed chamber 1 is equipped with a protective gas inlet 12, which is connected to an external nitrogen cylinder via a pipeline. A miniature pressure sensor 13 is fixedly installed on the inner wall of the sealed chamber 1 to monitor the pressure of the protective gas inside the chamber.

[0046] The working process of a welding device for a single-point liquid slip ring seal is as follows: Open the side door of the sealing chamber 1. Based on the cross-sectional model of the sealing ring to be repaired, select the appropriate clamp 33, heat dissipation component 24, heat insulation component 25, and heat conduction component 26, and install them onto the clamping end and the inner ring of the heating ring 23, respectively. Place the sealing chamber 1 at a suitable position next to the single-point liquid slip ring. Open the sealing cover of the inlet 11 and insert the cleaned and assembled PTFE sealing ring connector 7 into the chamber through the inlet 11, ensuring that the connector 7 is positioned precisely in the middle of the heat conduction component 26 of the welding mechanism 2. Then, insert both sides of the connector 7 into the left and right clamps 33 respectively. Manually rotate the clamps 33 along the arc-shaped guide rail to adjust to the optimal welding angle, and close the sealing cover of the inlet 11. Close the side and top doors, and fill the chamber with nitrogen through the protective gas inlet 12. Simultaneously, monitor the pressure inside the chamber through the pressure sensor 13. Once the pressure reaches the set value, maintain a small flow of air to maintain a positive pressure environment inside the chamber. Set the target heating temperature, heating rate, axial pressure, and holding time through the control unit 5. First, control unit 5 starts servo motor 43, driving screw drive assembly 41 to push movable clamping end 32 to the left. Pressure sensor provides real-time feedback of contact pressure. When the pressure reaches the set value, feeding stops and is maintained. Then, control unit 5 starts annular heating coil 23, heating according to the set heating rate. Temperature sensor 27 provides real-time temperature feedback, and control unit 5 performs PID adjustment. After reaching the set temperature, timing and pressure holding welding begin. After the welding time ends, control unit 5 turns off heating, maintaining pressure until temperature sensor 27 shows a drop below room temperature. Open the hatch and feed port 11, remove clamp 33, take out the welded sealing ring, and check the quality of joint 7.

[0047] The device described in this application achieves true in-situ welding of the liquid slip ring seal, avoiding complete replacement, significantly shortening repair time, and improving welding quality. Closed-loop pressure-displacement control and low-pressure thermoforming minimize damage to the PTFE material, resulting in high joint strength. The hull sealing with gas protection completely solves the limitations imposed on welding quality by the high-salt and high-humidity marine environment. The modular replacement of the clamp 33, heat dissipation component 24, heat insulation component 25, and heat conduction component 26 allows for the adaptation to various cross-sectional sizes of the seal, making it a multi-purpose device. The overall design is lightweight and easy to carry for operation on offshore platforms.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A welding device for a single-point liquid slip ring seal, characterized in that, include: Sealed chamber, welding mechanism, clamping mechanism, transmission mechanism and control unit; The welding mechanism is located inside the welding chamber; The clamping mechanism includes a fixed clamping end, a movable clamping end, and a clamp. The fixed clamping end is fixedly disposed on one side of the welding mechanism, and the movable clamping end is slidably disposed on the other side of the welding mechanism. The clamp is detachably disposed on the fixed clamping end and / or the movable clamping end, and is used to clamp the joint of the sealing ring to be welded. The transmission mechanism includes a screw drive assembly, a slide rail, and a servo motor. The slide rail is fixed to the bottom of the sealed chamber. The movable clamping end is slidably mounted on the slide rail. The output end of the servo motor is fixedly connected to the screw drive assembly, and the output end of the screw drive assembly is fixedly connected to the movable clamping end. The servo motor is electrically connected to the control unit. The control unit controls the servo motor to drive the screw drive assembly to move the movable clamping end along the slide rail.

2. The welding device for a single-point liquid slip ring seal according to claim 1, characterized in that, Both the fixed clamping end and the movable clamping end are provided with arc-shaped guide rails, and the clamp is slidably mounted on the arc-shaped guide rails so that the connector can rotate along the arc-shaped guide rails.

3. The welding device for a single-point liquid slip ring seal according to claim 1, characterized in that, The clamp includes a wedge block and a groove block, the wedge block and the groove block cooperate, and the connector is snapped between the wedge block and the groove block to prevent the connector from sliding backward during the welding pressure process.

4. The welding device for a single-point liquid slip ring seal according to claim 1, characterized in that, The welding mechanism includes a lower base, a top cover, a heating coil, a heat dissipation component, a heat insulation component, a heat conduction component, and a temperature sensor; The lower base is fixedly installed at the bottom of the sealed chamber, and the top cover of the base is fixedly connected to the top of the lower base; The heating coil is fixedly installed between the lower base and the top cover of the base, and is electrically connected to the control unit; Heat dissipation components are fixedly provided on the left and right sides of the heat-conducting component, and the heat insulation component is fixedly connected between the heat dissipation component and the heat-conducting component. The heat-conducting component is in contact with the outer surface of the connector for heat conduction. The temperature sensor is mounted on the heat-conducting component or the heating coil and is electrically connected to the control unit.

5. The welding device for a single-point liquid slip ring seal according to claim 1, characterized in that, The sealed chamber has a feed inlet on its side wall, and the feed inlet is equipped with an openable and closable sealing cover.

6. The welding device for a single-point liquid slip ring seal according to claim 4, characterized in that, Both the heat dissipation component and the heat insulation component consist of two parts, an upper and an lower part, which are clamped together by the heating coil.

7. The welding device for a single-point liquid slip ring seal according to claim 1, characterized in that, The transmission mechanism also includes a pressure sensor and a displacement sensor, which are integrated into the servo motor. Both the pressure sensor and the displacement sensor are electrically connected to the control unit, and the control unit controls the servo motor to work based on the information from the pressure sensor and the displacement sensor.

8. The welding device for a single-point liquid slip ring seal according to claim 1, characterized in that, The sides and top of the sealed chamber are openable doors, which are sealed to the main body of the chamber by sealing strips.

9. The welding device for a single-point liquid slip ring seal according to claim 1, characterized in that, The sealed chamber is provided with a protective gas inlet, which is connected to an external gas source through a pipeline; the sealed chamber is also provided with a pressure sensor, which is fixedly installed on the inner wall of the sealed chamber and electrically connected to the control unit.

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