Temperature sensor for ship engine

Abstract

The invention relates to a temperature sensor for a ship engine, and the temperature sensor comprises a metal protection outer tube, a thermal resistor element, a high-temperature-resistant wire and a high-temperature signal cable, the metal protection outer tube is formed by sequentially connecting a first metal tube, a variable cross-section sleeve and a second metal tube, and the end part of the second metal tube is welded with a sealing connection end; the thermal resistance element is arranged at the end part of the first section of metal tube; the high-temperature-resistant wire extends to the sealing connecting end from the first section of metal pipe; one end of the high-temperature-resistant wire is welded with the thermal resistor element, the other end is welded with one end of the high-temperature signal cable, and the welding point is located in the sealing connection end; the interior of the temperature measuring end is filled with an inorganic insulating material. High-temperature inorganic glue is filled in gaps among the leads of the thermal resistor element and gaps among the high-temperature-resistant wires; and the sealing connecting end is filled with high-temperature insulating sealant. The sensor can bear vibration, impact, bumping, inclined swinging and the like with a certain margin, and has good mechanical performance.

Description

Technical Field

[0001] The invention belongs to the technical field of temperature sensors, and in particular relates to a temperature sensor for a ship engine. Background Art

[0002] In order to ensure the safe operation of the ship, monitoring temperature sensors are usually installed at key measuring points on the ship engine to detect the temperature of the key points and realize real-time monitoring of the ship engine temperature.

[0003] A temperature sensor is a sensor that can sense temperature and convert it into a usable output signal. Temperature sensors are the core of temperature measuring instruments and come in a wide variety of types. They can be divided into contact and non-contact types based on the measurement method, and into thermal resistors and thermocouples based on the sensor material and electronic component characteristics.

[0004] At present, the temperature sensors used to monitor the key points of domestic ship engines are thermocouple temperature sensors, while the temperature sensors used in foreign ship engines use thermal resistor elements to measure temperature. However, the measurement accuracy of thermocouple temperature sensors is low and cannot meet the needs of accurate temperature monitoring under conditions such as high engine temperature, strong vibration, and sudden accident impact.

[0005] Therefore, under the background of localization, how to design and manufacture temperature sensors for ship engines to meet the requirements of accurately monitoring temperature under conditions of high temperature, strong vibration, sudden accident impact, etc. of the engine has become a problem that needs to be solved urgently. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a temperature sensor for a ship engine. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] The embodiment of the present invention provides a temperature sensor for a ship engine, comprising: a metal protective outer tube, a thermal resistance element, a high temperature resistant wire and a high temperature signal cable, wherein:

[0008] The metal protective outer tube is formed by sequentially connecting a first section of metal tube, a variable-section sleeve and a second section of metal tube, and a sealed connection end is welded at the end of the second section of metal tube;

[0009] The thermal resistance element is arranged at the end of the first section of the metal pipe to form a temperature measuring end, and the temperature measuring end realizes pressure-bearing sealing; the small end of the variable-section sleeve is close to the temperature measuring end;

[0010] The high temperature resistant wire extends from the first section of the metal tube, the variable cross-section sleeve, and the second section of the metal tube to the sealed connection end; one end of the high temperature resistant wire is welded to the thermal resistance element, and the other end is welded to one end of the high temperature signal cable, and the welding point is located inside the sealed connection end;

[0011] The high temperature signal cable is connected to the end of the high temperature resistant wire to form a shielded wire, and the shielded wire is exposed from the sealed connection end; the metal protective outer tube, the sealed connection end and the shielded wire form an anti-electromagnetic interference structure;

[0012] The interior of the temperature measuring end is filled with inorganic insulating material; the gaps between the leads of the thermal resistor element and the gaps between the high-temperature resistant wires are filled with high-temperature inorganic glue to composite the leads of the thermal resistor element, the high-temperature resistant wires, and the metal protective outer tube into one; the interior of the sealed connection end is filled with high-temperature insulating sealant to composite the sealed connection end, the high-temperature resistant wires and the welding points of the high-temperature signal cable into one and achieve sealing.

[0013] In one embodiment of the present invention, the small end of the variable cross-section sleeve is welded to the outer shell of the first section metal pipe by ring welding, and the large end is connected to the second section metal pipe by crimping process.

[0014] In one embodiment of the present invention, one end of the sealed connection end is welded to the second section of the metal tube by ring welding, and the other end is crimped to the shielding wire of the high-temperature signal cable by a crimping process.

[0015] In one embodiment of the present invention, the high-temperature insulating sealant is filled before the sealed connection end is crimped with the shielding wire, and the crimping process is completed before the high-temperature insulating sealant dries, so that the high-temperature insulating sealant wraps the welding points of the high-temperature resistant wire and the high-temperature signal cable; when the high-temperature insulating sealant dries, the sealed connection end, the high-temperature resistant wire and the welding points of the high-temperature signal cable are composited into one.

[0016] In one embodiment of the present invention, the metal protective outer tube and the sealing connection end are both made of stainless steel.

[0017] In one embodiment of the present invention, the number of the thermal resistance elements is greater than or equal to 2;

[0018] The thermal resistance element includes one or more of Pt100, Pt1000, and Pt2000;

[0019] The high temperature resistant wires and high temperature signal cables corresponding to the thermal resistance elements include a two-wire system, a three-wire system or a four-wire system.

[0020] In one embodiment of the present invention, the high temperature resistant wire comprises a first core wire layer and a first insulating layer wrapped outside the first core wire layer, wherein:

[0021] The material of the first core wire layer includes nickel or nickel alloy;

[0022] The material of the first insulating layer includes glass fiber or ceramic fiber.

[0023] In one embodiment of the present invention, the high temperature signal cable comprises a second core layer and a second insulating layer wrapping the second core layer, wherein the material of the second core layer comprises silver-plated copper or nickel-plated copper; the material of the second insulating layer comprises fluorinated ethylene propylene copolymer;

[0024] The plurality of high-temperature signal cables are wrapped with a shielding layer and a third insulating layer in sequence, wherein the shielding layer is formed by weaving metal wires, and the shielding layer at the end of the high-temperature signal cable is exposed to form the shielding wire; the material of the third insulating layer includes ethylene fluoride propylene copolymer.

[0025] In one embodiment of the present invention, the inorganic insulating material includes one or more of magnesium oxide, aluminum oxide, and silicon dioxide;

[0026] The high temperature inorganic glue comprises magnesium oxide insulating material mixed with water glass slurry;

[0027] The high temperature insulating sealant is an organic sealant with a use temperature greater than 200°C.

[0028] In one embodiment of the present invention, the equal-section section of the variable-section casing is provided with a ferrule, and the ferrule is used to connect the interface to be tested;

[0029] The second section of the metal tube has a bend.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The temperature sensor of the present invention adopts a thermal resistor element as a temperature measuring element, and has higher temperature measuring precision and accuracy than a thermocouple temperature sensor; the metal protective outer tube is adopted, which can not only ensure the stability and reliability of the temperature sensor performance and meet the sealing performance when a ship loses water, but also the metal protective outer tube, the sealing connection end, and the shielding wire form an anti-electromagnetic interference structure, which isolates the thermal resistor element and the high-temperature resistant wire from the outside world, and prevents electromagnetic interference and radio frequency interference; the variable-section casing is adopted, which can improve the thermal response time without reducing the overall strength of the temperature sensor; the inorganic insulating material is filled at the temperature measuring end, which can not only improve the performance of the temperature sensor in resisting mechanical vibration, impact, etc., but also improve the thermal response time. time; by using high-temperature inorganic glue to compound the thermal resistor element lead, high-temperature resistant wire, and metal protective outer tube into one, the mechanical properties of the temperature sensor such as resistance to vibration, impact, vibration, tilt and swing can be improved; by using high-temperature insulating sealant to compound the sealing connection end, the welding point of the high-temperature resistant wire and the high-temperature signal cable into one, the performance of the temperature sensor such as resistance to mechanical vibration, impact and insulation sealing can be improved, and it can work in a high-temperature environment; therefore, the temperature sensor can work in a high-temperature environment for a long time, can withstand a certain degree of vibration, impact, vibration, tilt and swing and other conditions, has good mechanical properties, and at the same time ensures that the required thermal response time is met, the temperature measurement accuracy and precision are high, and it has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a temperature sensor for a ship engine provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the arrangement of a thermal resistor element in a metal protective outer tube provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0035] Embodiment 1

[0036] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of a temperature sensor for a ship engine provided by an embodiment of the present invention. Figure 2 A schematic diagram of the arrangement of a thermal resistor element in a metal protective outer tube provided in an embodiment of the present invention.

[0037] The temperature sensor for ship engines in this embodiment is used to monitor the temperature on the engine, and includes a metal protective outer tube 1, a thermal resistor element 2, a high temperature resistant wire 3 and a high temperature signal cable 4. The metal protective outer tube 1 is formed by sequentially connecting a first section of a metal tube 11, a variable cross-section sleeve 12 and a second section of a metal tube 13, and a sealed connection end 14 is welded to the end of the second section of the metal tube 13; the thermal resistor element 2 is arranged at the end of the first section of the metal tube 11 to form a temperature measuring end, and the temperature measuring end realizes pressure-bearing sealing; the small end of the variable cross-section sleeve 12 is close to the temperature measuring end; the high temperature resistant wire 3 extends from the first section of the metal tube 11, the variable cross-section sleeve 12, and the second section of the metal tube 13 to the sealed connection end 14; one end of the high temperature resistant wire 3 is welded to the thermal resistor element 2, and the other end is welded to one end of the high temperature signal cable 4, and the welding point is located in the sealed connection end 14; The high-temperature signal cable 4 is connected to the end of the high-temperature resistant wire 3 to form a shielding wire 41, and the shielding wire 41 exposes the sealed connection end 14; the metal protective outer tube 1, the sealed connection end 14 and the shielding wire 41 form an anti-electromagnetic interference structure; the interior of the temperature measuring end is filled with inorganic insulating material; the gaps between the leads of the thermal resistor element 2 and the gaps between the high-temperature resistant wires 3 are filled with high-temperature inorganic glue to composite the leads of the thermal resistor element 2, the high-temperature resistant wires 3, and the metal protective outer tube 1 into one; the interior of the sealed connection end 14 is filled with high-temperature insulating sealant to composite the sealed connection end 14, the high-temperature resistant wire 3 and the welding points of the high-temperature signal cable 4 into one and achieve sealing.

[0038] Specifically, the temperature sensor is formed by a plurality of thermal resistor elements 2 compounded in a metal protective outer tube 1, the thermal resistor element 2 is arranged in the metal protective outer tube 1 to form a temperature measuring end, the thermal resistor element 2 is connected to the high temperature resistant wire 3 by laser welding, and the high temperature resistant wire 3 is connected to the high temperature signal cable 4 by resistance welding. After the thermal resistor element 2 receives the temperature on the engine, it transmits the resistance signal to the monitoring system through the high temperature resistant wire 3 and the high temperature signal cable 4. The position of the thermal resistor element 2 in the temperature measuring end is defined as the measuring point, that is, the temperature measuring end is located at the end of the metal protective outer tube 1, and the measuring point is located in the metal protective outer tube 1. The temperature measuring end of the metal protective outer tube 1 is pressure-sealed by head welding. For example, the temperature measuring end is sealed by argon arc welding.

[0039] In a specific embodiment, the number of thermal resistor elements 2 is greater than or equal to 2, and the plurality of thermal resistor elements 2 are arranged at the same height position of the temperature measuring end of the metal protective outer tube; the thermal resistor element 2 includes one or more of Pt100, Pt1000, and Pt2000. The number of high temperature resistant wires 3 and high temperature signal cables 4 is the same, which is twice, three times, or four times the number of thermal resistor elements 2 in the temperature sensor, that is, the high temperature resistant wire 3 and high temperature signal cable 4 corresponding to one thermal resistor element 2 include a two-wire system (two core wires), a three-wire system (three core wires), or a four-wire system (four core wires).

[0040] The surrounding of the thermal resistor element 2 and the sealing welding place between the thermal resistor element 2 and the temperature measuring end are filled with inorganic insulating materials, that is, the interior of the temperature measuring end is filled with inorganic insulating materials. In a specific embodiment, the inorganic insulating material includes one or more of magnesium oxide, aluminum oxide, and silicon dioxide; the inorganic insulating material selected for the high temperature resistant wire is different according to the use temperature. The inorganic insulating material can not only improve the performance of the temperature sensor in resisting mechanical vibration, impact, etc., but also improve the thermal response time.

[0041] In the metal protective outer tube 1, the gaps between the leads of the thermal resistor element 2 and the gaps between the high temperature resistant wires 3 are filled with high temperature inorganic glue, which is used to ensure that the leads of the thermal resistor element 2, the high temperature resistant wires 3 and the metal protective outer tube 1 are integrated into one body, thereby improving the mechanical properties of the temperature sensor against vibration, impact, vibration, tilt and swing, etc. In a specific embodiment, the high temperature inorganic glue includes magnesium oxide insulating material mixed with water glass slurry.

[0042] A section of variable-section sleeve 12 is provided near the temperature measuring end of the metal protective outer tube 1, dividing the metal protective outer tube 1 into three sections: a first section of the metal tube 11, a variable-section sleeve 12 and a second section of the metal tube 13. The thermal resistor element 2 (temperature measuring end) is located at the end of the first section of the metal tube 11, and the high-temperature resistant wire 3 extends from the first section of the metal tube 11, the variable-section sleeve 12 and the second section of the metal tube 13 in sequence.

[0043] The variable cross-section sleeve 12 includes a variable cross-section section 121 and a constant cross-section section 122. The variable cross-section section 121 is close to the temperature measuring end and the small end of the variable cross-section section 121 is connected to the first section of the metal tube 11. The constant cross-section section 122 is close to the second section of the metal tube 13 and is connected to the second section of the metal tube 13. It can be understood that the small end of the variable cross-section sleeve 12 is connected to the first section of the metal tube 11, and the large end is connected to the second section of the metal tube 13.

[0044] In a specific embodiment, the small end of the variable cross-section sleeve 12 is welded to the outer shell of the first section metal tube 11 by girth welding (for example, laser welding), and the large end is connected to the second section metal tube 13 by crimping. By crimping, the variable cross-section sleeve 12 is firmly fixed to the metal protection outer tube 1. In order to ensure the sealing quality, the girth welding sealing of the variable cross-section sleeve 12 and the metal protection outer tube 1 must be guaranteed.

[0045] For example, the distance from the variable cross-section small end of the variable cross-section sleeve 12 to the ferrule crimping point is 84 mm, and the length of the large end crimping with the second section of the metal tube 13 is 5 mm. The diameter of the small end of the variable cross-section sleeve 12 is 3.2 mm, and the diameter of the large end is 4.5 mm.

[0046] In this embodiment, the variable-section sleeve and the metal protective outer tube are connected by crimping, so that the connection between the two is more firm, thereby ensuring the safety and reliability of the sensor under the operating environment conditions.

[0047] The metal protective outer tube 1 is welded with a sealed connection end 14 near the wiring terminal, wherein the wiring terminal refers to the welding point of the high temperature resistant wire 3 and the high temperature signal cable 4. The function of the sealed connection end 14 is to strengthen the connection performance between the high temperature resistant wire 3 and the high temperature signal cable 4, to ensure the stable and reliable connection between the high temperature resistant wire 3 and the high temperature signal cable 4, and to ensure that the resistance signal monitored by the thermal resistor element 2 can be stably and reliably transmitted to the monitoring system through the high temperature resistant wire 3 and the high temperature signal cable 4. Exemplarily, the distance between the end of the sealed connection end 14 near the high temperature resistant wire 3 and the wiring terminal is 12 mm.

[0048] In a specific embodiment, one end of the sealed connection end 14 is welded to the second section of the metal tube 13 by ring welding (such as laser welding), and the other end is crimped to the shielding wire 41 of the high-temperature signal cable 4 by a crimping process. Exemplarily, the crimping length is 5 mm.

[0049] It should be emphasized that all welding points in this embodiment need to be sealed to ensure the sealing between the sensor and the interface and the integrity of the sensor.

[0050] The sealing connection end 14 is made of metal material, so that the metal protection outer tube 1, the sealing connection end 14 and the shielding wire 41 form an anti-electromagnetic interference structure. In a specific embodiment, the metal protection outer tube 1 and the sealing connection end 14 are made of stainless steel, such as Inconel600 stainless steel; the use of stainless steel material can ensure that the performance of the temperature sensor is more stable and reliable, and ensure the sealing performance when a loss of water accident occurs on the ship.

[0051] In order to ensure the insulation performance of the temperature sensor, the sealed connection end 14 and the shielding wire 41 are filled with high-temperature insulating sealant before crimping; before the high-temperature insulating sealant dries, the crimping process is completed so that the high-temperature insulating sealant completely wraps the welding point between the high-temperature resistant wire 3 and the high-temperature signal cable 4, while ensuring the sealing performance of the sealed connection end 14; after the high-temperature insulating sealant dries, the sealed connection end 14, the high-temperature resistant wire 3 and the high-temperature signal cable 4 are combined into one, thereby improving the temperature sensor's resistance to mechanical vibration, impact and insulation sealing. In a specific embodiment, the high-temperature insulating sealant is an organic glue with an operating temperature greater than 200°C, and it still has good insulation and sealing properties when used above 200°C for a long time.

[0052] In a specific embodiment, the high temperature resistant wire 3 is used as a signal transmission line, including a first core wire layer and a first insulating layer wrapped outside the first core wire layer, wherein the material of the first core wire layer includes nickel or nickel alloy, and exemplarily, the cross-sectional area of ​​the first core wire layer is 4×0.5mm 2 The material of the first insulating layer includes glass fiber or ceramic fiber, and the insulating layer material ensures that the sensor still has insulating properties at a high temperature of 700° C. Furthermore, the first insulating layers corresponding to the same resistor element have the same color.

[0053] In this embodiment, the core wire layer material of the high temperature resistant wire 3 is nickel or nickel alloy, which can ensure that the lead wire of the thermal resistance element can have good welding performance and low resistance value with the high temperature resistant wire, and can ensure the service life of the temperature sensor. The insulating layer material is glass fiber or ceramic fiber, which can ensure that the temperature sensor still has good insulation performance at high temperature.

[0054] In a specific embodiment, the high temperature signal cable 4 includes a second core layer and a second insulating layer wrapped around the second core layer, wherein the material of the second core layer includes silver-plated copper or nickel-plated copper; the material of the second insulating layer includes fluorinated ethylene propylene copolymer. A plurality of high temperature signal cables 4 are sequentially wrapped with a shielding layer and a third insulating layer, wherein the shielding layer is formed by braiding metal wires, and the shielding layer at the end of the high temperature signal cable 4 is exposed to form a shielded wire 41; the material of the third insulating layer includes fluorinated ethylene propylene copolymer.

[0055] Specifically, the high temperature signal cable 4 is used as a signal transmission line, and from the inside to the outside, it is a second core layer and a second insulation layer. Exemplarily, the cross-sectional area of ​​the second core layer is 4×0.5 mm 2 The second insulation layer uses FEP, which is used to insulate the core wire materials from each other. The second insulation layer uses the same color to represent the leads of the same element, and the number of colors indicates how many thermal resistor elements the sensor has.

[0056] A plurality of high-temperature signal cables 4 are wrapped with a shielding layer and a third insulating layer in sequence. At the connection between the high-temperature signal cable 4 and the high-temperature resistant conductor 3, the shielding layer is exposed to form a shielding wire 41, and the shielding wire 41 exposes the sealed connection end 14, and the sealed connection end 14 is crimped on the shielding wire 41. The setting of the shielding layer and the crimping method of the shielding layer can prevent electromagnetic interference and radio frequency interference, so that the temperature sensor has good anti-electromagnetic interference performance and ensures the accuracy and reliability of the sensor signal. A layer of FEP insulating material is laid outside the shielding layer as the third insulating layer. The function of this layer of FEP insulating material is to wrap the core wire, the second insulating layer outside the core wire, and the shielding layer together, so that the temperature sensor maintains the insulation of the outer shell. Even under the condition of water loss accident, it still has good insulation performance and continues to realize its monitoring function. At the same time, this layer of FEP insulating material can ensure that the cable as a whole can withstand a high temperature of 200°C.

[0057] In a specific embodiment, the equal-section section 122 of the variable-section sleeve 12 is sleeved with a ferrule 5, and the ferrule 5 is used to connect the interface to be tested.

[0058] Specifically, the function of the ferrule 5 is to match the corresponding temperature measurement interface on the engine, and the position of the ferrule determines the position of the temperature sensor and the interface seal. The ferrule 5 has a G1 / 4A thread, and the G1 / 4A thread and the corresponding interface on the engine are sealed by a gasket. The other end of the ferrule 5 has a cap. By tightening the cap on the ferrule 5, the bead in the ferrule 5 is deformed on the variable cross-section sleeve, and the variable cross-section sleeve is clamped, so that the ferrule 5 and the temperature sensor on the ship engine can be sealed.

[0059] Exemplarily, the distance between the G1 / 4A thread seal of the ferrule 5 and the head welding point is 82 mm.

[0060] In a specific embodiment, in order to facilitate the routing of the temperature sensor in the interface to be tested, a bend 131 is provided on the second section of the metal tube 13 , and the position, angle and length of the bend 131 can be set according to actual installation requirements.

[0061] For example, the second section of the metal tube 13 has a R20 bend at a distance of 123 mm from the sealing weld of the temperature measuring end, and the bend length is 31.4 mm.

[0062] The temperature sensor of this embodiment is manufactured into a temperature sensor for ship engines that meets the requirements according to the required bending position and bending radius after passing the cutting, welding, crimping, positioning, gluing, continuity detection, and insulation detection. The graduation and insulation performance are tested again, and the manufacturing of the temperature sensor for ship engines is completed after passing the test.

[0063] The temperature sensor of this embodiment has an insulation type between the thermal resistor element 2 and the first section of the metal tube 11 at the temperature measuring end. The thermal resistor element has a room temperature insulation performance greater than 100GΩ (measurement voltage 500VDC) and a measurement accuracy of Class A (R 0红-红 =999.752Ω, R 0白-白 =999.998Ω; R 100红-红 =1384.486Ω、R 100白-白 =1384.555Ω), R 100红-红 / R 0红-红 =1.384829, R 100白-白 / R 0白-白 =1.384558, thermal response time is less than τ 0.5红-红 =1.8s, τ 0.5白-白=1.9s. The welded sealing structure ensures that the sealing performance of the sensor meets the IP65 protection level. This temperature sensor is a double-branch type, that is, there are two thermal resistance elements, R 0红-红 The resistance value of a group of thermal resistance elements marked in red for the high-temperature signal cable leads at 0°C; R 0白-白 The resistance value of another group of thermal resistance elements marked in white at 0°C for the high-temperature signal cable leads; R 100红-红 The resistance value of a group of thermal resistance elements marked in red for the high-temperature signal cable leads at 100°C; R 100白-白 is the resistance value of a group of thermal resistance elements with white leads of high temperature signal cable at 100℃; R 100红-红 / R 0红-红 The ratio of the resistance value at 100℃ to the resistance value at 0℃ for a group of thermal resistance elements marked in red for the high-temperature signal cable leads; R 100白-白 / R 0白-白 The ratio of the resistance value at 100℃ to the resistance value at 0℃ for a group of thermal resistance elements marked in white for the high-temperature signal cable leads; τ 0.5红-红 The thermal response time of a group of thermal resistance elements marked in red for the high-temperature signal cable leads under the condition of a coefficient of 0.5; τ 0.5白-白 A group of thermal resistor elements marked in white for high-temperature signal cable leads, with a thermal response time of 0.5 coefficient; IP65 is a level in the protection level standard IEC60529 established by the International Organization for Standardization, indicating that the device can be used outdoors or in places where water splashes frequently.

[0064] The temperature sensor of this embodiment has accurate and reliable temperature measurement, strong pressure resistance, stable monitoring signal, and can be used in the temperature range of 0°C to 700°C.

[0065] The temperature sensor of this embodiment adopts a thermal resistor element as a temperature measuring element, which has higher temperature measurement precision and accuracy than a thermocouple temperature sensor; the use of a metal protective outer tube can not only ensure the stability and reliability of the temperature sensor performance and meet the sealing performance when a ship loses water, but also the metal protective outer tube and the sealed connection end and the shielding wire form an anti-electromagnetic interference structure, which isolates the thermal resistor element and the high-temperature resistant wire from the outside world, preventing electromagnetic interference and radio frequency interference; the use of a variable-section casing can improve the thermal response time without reducing the overall strength of the temperature sensor; filling the temperature measurement end with inorganic insulating material can not only improve the temperature sensor's resistance to mechanical vibration, impact, etc., but also improve the thermal response time; through high-temperature inorganic The mechanical glue combines the leads of the thermal resistor element, the high-temperature resistant wire, and the metal protective outer tube into one, which can improve the mechanical properties of the temperature sensor such as resistance to vibration, impact, shaking, tilting and swaying; the high-temperature insulating sealant is used to combine the sealing connection end, the high-temperature resistant wire and the welding point of the high-temperature signal cable into one, which can improve the temperature sensor's resistance to mechanical vibration, impact and insulation sealing, and can work in a high-temperature environment; therefore, the temperature sensor can work in a high-temperature environment for a long time, can withstand a certain degree of vibration, impact, shaking, tilting and swaying conditions, has good mechanical properties, and at the same time ensures that the required thermal response time is met, the temperature measurement accuracy and precision are high, it has a long service life, and the cost is low, which can meet different environmental requirements.

[0066] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A temperature sensor for a ship engine, characterized in that: include: A metal protective outer tube (1), a thermal resistance element (2), a high temperature resistant wire (3) and a high temperature signal cable (4), wherein: The metal protective outer tube (1) is formed by sequentially connecting a first section of a metal tube (11), a sleeve with a variable cross-section (12), and a second section of a metal tube (13); a sealed connection end (14) is welded to the end of the second section of the metal tube (13); The thermal resistance element (2) is arranged at the end of the first section of the metal tube (11) to form a temperature measuring end, and the temperature measuring end realizes pressure-bearing sealing; the small end of the variable-section sleeve (12) is close to the temperature measuring end; The high temperature resistant wire (3) extends from the first section of the metal tube (11), the variable cross-section sleeve (12), and the second section of the metal tube (13) to the sealed connection end (14); one end of the high temperature resistant wire (3) is welded to the thermal resistance element (2), and the other end is welded to one end of the high temperature signal cable (4), and the welding point is located inside the sealed connection end (14); The high-temperature signal cable (4) is connected to the end of the high-temperature resistant wire (3) to form a shielding wire (41), and the shielding wire (41) is exposed from the sealed connection end (14); the metal protective outer tube (1), the sealed connection end (14) and the shielding wire (41) form an anti-electromagnetic interference structure; The interior of the temperature measuring end is filled with an inorganic insulating material; the gaps between the leads of the thermal resistor element (2) and the gaps between the high-temperature resistant wires (3) are filled with high-temperature inorganic glue to composite the leads of the thermal resistor element (2), the high-temperature resistant wires (3) and the metal protective outer tube (1) into one; the interior of the sealed connection end (14) is filled with a high-temperature insulating sealant to composite the welding points of the sealed connection end (14), the high-temperature resistant wires (3) and the high-temperature signal cable (4) into one and achieve sealing.

2. The temperature sensor for a ship engine according to claim 1, characterized in that: The small end of the variable cross-section sleeve (12) is welded to the outer shell of the first section metal pipe (11) by ring welding, and the large end is connected to the second section metal pipe (13) by a crimping process.

3. The temperature sensor for a ship engine according to claim 1, characterized in that: One end of the sealed connection end (14) is welded to the second section of the metal tube (13) by ring welding, and the other end is crimped onto the shielding wire (41) of the high-temperature signal cable (4) by a crimping process.

4. The temperature sensor for a ship engine according to claim 3, characterized in that: The high-temperature insulating sealant is filled before the sealed connection end (14) and the shielding wire (41) are crimped, and the crimping process is completed before the high-temperature insulating sealant dries, so that the high-temperature insulating sealant wraps the welding points of the high-temperature resistant wire (3) and the high-temperature signal cable (4); when the high-temperature insulating sealant dries, the sealed connection end (14), the high-temperature resistant wire (3) and the welding points of the high-temperature signal cable (4) are combined into one.

5. The temperature sensor for a ship engine according to claim 1, characterized in that: The materials of the metal protective outer tube (1) and the sealing connection end (14) both include stainless steel.

6. The temperature sensor for a ship engine according to claim 1, characterized in that: The number of the thermal resistance elements (2) is greater than or equal to 2; The thermal resistance element (2) includes one or more of Pt100, Pt1000, and Pt2000; The high temperature resistant wire (3) and the high temperature signal cable (4) corresponding to the thermal resistance element (2) include a two-wire system, a three-wire system or a four-wire system.

7. The temperature sensor for a ship engine according to claim 1, characterized in that: The high temperature resistant wire (3) comprises a first core wire layer and a first insulating layer wrapped outside the first core wire layer, wherein: The material of the first core wire layer includes nickel or nickel alloy; The material of the first insulating layer includes glass fiber or ceramic fiber.

8. The temperature sensor for a ship engine according to claim 1, characterized in that: The high-temperature signal cable (4) comprises a second core layer and a second insulating layer wrapping the second core layer, wherein the material of the second core layer comprises silver-plated copper or nickel-plated copper; the material of the second insulating layer comprises fluorine-ethylene-propylene copolymer; A plurality of the high-temperature signal cables (4) are wrapped with a shielding layer and a third insulating layer in sequence, wherein the shielding layer is formed by braiding metal wires, and the shielding layer at the end of the high-temperature signal cable (4) is exposed to form the shielding wire (41); the material of the third insulating layer includes ethylene fluoride propylene copolymer.

9. The temperature sensor for a ship engine according to claim 1, characterized in that: The inorganic insulating material includes one or more of magnesium oxide, aluminum oxide, and silicon dioxide; The high temperature inorganic glue comprises magnesium oxide insulating material mixed with water glass slurry; The high temperature insulating sealant is an organic sealant with a use temperature greater than 200°C.

10. The temperature sensor for a ship engine according to claim 1, characterized in that: The equal-section section (122) of the variable-section sleeve (12) is sleeved with a ferrule (5), and the ferrule is used to connect to the interface to be tested; The second section of the metal tube (13) has a bend (131).

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