Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed is a thermocouple sensor with a long service life. The thermocouple sensor comprises a junction box (1), wherein a steel tube (3) is fixedly connected to the right side of the junction box (1), the inner surface of the steel tube (3) is covered by a shielding layer (4), the inner surface of the shielding layer (4) is covered by an insulating layer (5), the inner surface of the insulating layer (5) is covered by a thermocouple wire (6), the outer surface of the steel tube (3) is coated with an anti-corrosion layer (7), and the anti-corrosion layer (7) is composed of a chlorosulfonated polyethylene layer (71) and a silicon nitride coating layer (72). By means of providing the insulating layer (5), the insulating effect of the thermocouple sensor is good, and the phenomenon of the thermocouple sensor being prone to conducting electricity during operation is avoided. The chlorosulfonated polyethylene layer (71) has good ageing resistance and chemical atmospheric corrosion resistance, and good durability. The silicon nitride coating layer (72) has the advantages of good lubricity, wear resistance and strong toughness, and does not chemically react with most acids, and by means of providing the silicon nitride coating layer (72), the corrosion resistance can be enhanced.
A: A sample (6) for measuring galvanic corrosion between a conductive coating (3) and a protected substrate (1), and an evaluation method therefor. A microporous insulating layer (2) is arranged between the conductive coating (3) and the substrate (1). The microporous insulating layer (2) is formed of an insulating material, and has a microporous structure therein. The microporous structure is filled with a conductive medium, and then ion channels are formed between the conductive coating (3) and the surface of the substrate (1). The substrate (1) and the conductive coating (3) are each connected to an independent lead (5). The sample (6) can more comprehensively evaluate galvanic corrosion between a conductive coating (3) and other conductive materials.
B: An ultra-small high-sensitivity two-dimensional anemometer, comprising: a base (1), an insulation dielectric layer (2), a square frustum (3), a heating element (4), and four temperature-measuring thermocouple piles (51). The invention provides an ultra-small high-sensitivity two-dimensional anemometer and a corresponding manufacturing method for the ultra-small high-sensitivity two-dimensional anemometer, and has the following advantages: 1) the frustum structure creates a height difference between a measurement plane and a plane where a welding lead is located, thereby facilitating packaging of a sensor; 2) the thermocouple of the sensor is placed approximately vertically, and a cold end thereof is sealed by an encapsulation adhesive and kept at the same temperature as the base and an outer casing, thereby effectively ensuring temperature uniformity of the cold end and causing the sensor to have good resistance to temperature drift; 3) the frustum structure greatly reduces the lateral dimension of the thermocouple and decreases the size of the device; and 4) a high-sensitivity surface of the sensor is closely attached to the outer casing with no encapsulation adhesive exposed to the air, thereby improving reliability of the sensor.
C: A corrosion-resistant graphene oil delivery pipe, comprising a PVC (polyvinyl chloride) polyethylene inner layer (1); adhesion assisting holes (2) are uniformly arranged on the outer wall of the PVC polyethylene inner layer, the outer wall of the PVC polyethylene inner layer (1) is coated with a butyl rubber layer (3), the outer wall of the butyl rubber layer (3) is uniformly coated with an antistatic layer (4), cushion rubber lugs (5) are uniformly and annularly adhered on the outer wall of the antistatic layer (4) by means of an adhesive, the outer wall of the butyl rubber layer (3) is wrapped with a metal mesh layer (6), the cushion rubber lugs (5) are positioned between the butyl rubber layer (3) and the metal mesh layer (6), and the outer wall of the metal mesh layer (6) is coated with a graphene outer layer (7). Further disclosed is a preparation method for the corrosion-resistant graphene oil delivery pipe. The corrosion-resistant graphene oil delivery pipe is provided with an antistatic layer, such that the phenomenon that delivered petroleum is ignited due to static electricity generated in use of the oil delivery pipe is avoided; the PVC polyethylene inner layer, good in corrosion resistance, is disposed to be in a direct contact with petroleum; and the graphene outer layer with anti-corrosion property protects the outer wall of the oil delivery pipe.
D: A thin film type thermocouple, comprising a substrate (10), a thermocouple unit (20) provided on one side of the substrate (10) and comprising a first metal electrode (22) and a second metal electrode (24), one end of the first metal electrode (22) being connected to one end of the second metal electrode (24); and a heat conduction member (30) provided on one side of the substrate (10) distant from the thermocouple unit (20), and corresponding to the position where the first metal electrode (22) is connected to the second metal electrode (24). The thin film type thermocouple is small in size and high in heat conduction rate. Also provided are a temperature sensor (200) having the thin film type thermocouple, and an intelligent wearable device.
Answer: D