A high-temperature resistant metal head thermocouple

Abstract

This utility model relates to a high-temperature resistant metal-head thermocouple, comprising a metal shell that is closed at the top and open at the bottom, and a thermocouple. The thermocouple is disposed inside the metal shell and abuts against or near the closed surface. The two leads of the thermocouple extend out of the metal shell through the open end, and a signal line shielding sleeve is sleeved between the end of the lead near the thermocouple and the metal shell. This thermocouple has the advantages of simple structure, high temperature resistance, and long service life. The signal line shielding sleeve can reduce signal interference to the lead, making the temperature sensing signal transmission circuit more accurate and faster.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensors, specifically a high-temperature resistant metal-head thermocouple. Background Technology

[0002] Current temperature sensor structures, as shown in Chinese patent document (application number 201820313667.0) concerning thermocouples, cooking pots, and cookers, include a positive electrode wire, a negative electrode wire, and a metal shell encasing both wires. The positive electrode wire comprises a positive main body section and a positive extension section. One end of the positive main body section and one end of the negative main body section are connected to form a temperature sensing end. The thermocouple senses the temperature of the metal shell through the temperature sensing end and then feeds back the temperature data via the loop formed by the positive and negative electrode wires. However, during use, the positive and negative main body sections are susceptible to signal interference, which may cause delays or deviations in the feedback temperature signal. Therefore, further improvements to existing temperature sensors are needed. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned existing problems and provide a high-temperature resistant metal head thermocouple with a simple and reasonable structure.

[0004] A high-temperature resistant metal-head thermocouple includes a metal shell that is closed at the top and open at the bottom, and a thermocouple. The thermocouple is disposed inside the metal shell and is against or close to the closed surface. The two leads of the thermocouple extend out of the metal shell through the open end, and a signal line shielding sleeve is also sleeved between the end of the lead near the thermocouple and the metal shell.

[0005] The objective of this utility model can also be achieved by the following technical measures:

[0006] As a more specific embodiment, the end of the lead wire near the thermocouple is also fitted with a silicone sleeve, which is placed on the outside between the signal wire shield and the metal shell.

[0007] As a further solution, thermally conductive silicone grease is also filled between the metal casing and the thermocouple.

[0008] As a further solution, a heat shrink sleeve is also included, with a portion of the heat shrink sleeve fitted over the outer end of the signal line shielding sleeve and the other portion fitted over the two leads.

[0009] As a further embodiment, a flattening position is provided on the side wall of the metal casing near the opening.

[0010] As a further embodiment, the outer ends of both the signal line shielding sleeve and the silicone sleeve extend beyond the metal casing through an opening; and the length of the signal line shielding sleeve is greater than that of the silicone sleeve.

[0011] As a further embodiment, the lead wire includes a metal wire and a braided sleeve that is wrapped around the metal wire; the braided sleeve is made of flexible fiber filaments, and the signal line shielding sleeve is made of flexible metal wires.

[0012] As a further solution, a grounding terminal piece is also included, which has a through hole adapted to the diameter of the metal casing. The grounding terminal piece is tightly fitted onto the metal casing through the through hole and forms an electrical connection with the metal casing.

[0013] As a further embodiment, the ground terminal piece is provided with a circumferential stamping area near the outer periphery of the metal casing. During stamping, the circumferential stamping area causes the wall of the through hole to narrow or form a protrusion, and the ground terminal piece clamps the metal casing by narrowing or protruding.

[0014] As a further embodiment, during the stamping process, the upper and lower surfaces of the grounding terminal piece form relatively recessed upper and lower indentations corresponding to the circumferential stamping area.

[0015] The beneficial effects of this utility model are as follows:

[0016] This utility model discloses a high-temperature resistant metal head thermocouple. This thermocouple has the advantages of simple structure, high temperature resistance, and long service life. The signal line shielding sleeve can reduce signal interference to the lead wire, making the temperature sensing signal transmission circuit more accurate and faster. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the metal-head thermocouple in this utility model.

[0018] Figure 2 for Figure 1 Enlarged structural diagram at point B.

[0019] Figure 3 This is a schematic diagram of the flattened structure of the metal shell in this utility model.

[0020] Figure 4 This is a schematic diagram of the disassembly and lead wire structure of the metal head thermocouple in this utility model.

[0021] Figure 5 This is a schematic diagram showing the narrowing or protrusion of the circumferential stamping area before and after stamping in this utility model.

[0022] Figure 6 This is a schematic diagram of the grounding terminal block structure in this utility model. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] See Figure 1 and Figure 4 As shown, a high-temperature resistant metal-head thermocouple includes a metal shell 1 that is closed at the top and open at the bottom, and a thermocouple 2. The thermocouple 2 is disposed inside the metal shell 1 and abuts against or is close to the closed surface 101. The two leads 3 of the thermocouple 2 extend out of the metal shell 1 through the open opening 102, and a signal line shielding sleeve 4 is also sleeved between the end of the lead 3 near the thermocouple 2 and the metal shell 1.

[0025] This thermocouple has the advantages of simple structure, high temperature resistance and long service life. The signal line shielding sleeve can reduce signal interference to the lead wire, making the temperature sensing signal transmission circuit more accurate and faster.

[0026] The end of the lead wire 3 near the thermocouple 2 is also fitted with a silicone sleeve 5, which is placed on the outside between the signal line shielding sleeve 4 and the metal shell 1; the silicone sleeve 5 can achieve insulation and isolation between the metal shell 1 and the signal line shielding sleeve 4.

[0027] The metal casing 1 and the thermocouple are filled with thermally conductive silicone grease 6. The thermally conductive silicone grease 6 fills the gap between the thermocouple 2 and the metal casing 1, and uses the thermally conductive silicone grease 6 to transfer the heat of the metal casing 1 to the thermocouple 2.

[0028] It also includes a heat shrink sleeve 7, a part of which is fitted over the outer end of the signal line shielding sleeve 4, and the other part of which is fitted over the two leads 3; the heat shrink sleeve 7 can fix the signal line shielding sleeve 4 and prevent the signal line shielding sleeve 4 from sliding down along the leads 3.

[0029] A flattening position 103 is provided on the side wall of the metal shell 1 near the opening 102; the flattening position 103 is formed during stamping, and the flattened metal shell 1 can clamp and fix the two lead wires 3, the signal line shielding sleeve 4 and the silicone sleeve 5.

[0030] The outer ends of the signal line shielding sleeve 4 and the silicone sleeve 5 extend out of the metal shell 1 through the opening 102; and the length of the signal line shielding sleeve 4 is greater than that of the silicone sleeve 5; the length of the signal line shielding sleeve 4 and the silicone sleeve 5 is greater than that of the metal shell 1, ensuring that the silicone sleeve 5 can insulate and isolate the signal line shielding sleeve 4 from the metal shell 1.

[0031] The lead wire 3 includes a metal wire 31 and a braided sleeve 32 that is wrapped around the metal wire 31; the braided sleeve 32 is made of flexible fiber filaments, and the signal line shielding sleeve 4 is made of flexible metal wires.

[0032] See Figure 5 As shown, it also includes a ground terminal piece 8, which has a through hole 81 that is adapted to the diameter of the metal housing 1. The ground terminal piece 8 is tightly fitted onto the metal housing 1 through the through hole 81 and forms an electrical connection with the metal housing 1.

[0033] The grounding terminal piece 8 has a circumferential stamping area M near the outer periphery of the metal casing 1 (e.g., Figure 5 As shown in Figure A1, the circumferential stamping zone M causes the hole wall 811 of the through hole 81 to narrow during stamping (as shown in Figure A1). Figure 5 (as shown in Figure A1) or forming a protrusion 812 (such as...) Figure 5 As shown in Figure A1, the ground terminal piece 8 clamps the metal housing 1 by narrowing or protruding 812.

[0034] By stamping and transforming, the ground terminal piece 8 is fixed to the metal shell 1, making the connection between the ground terminal piece 8 and the metal shell 1 more secure and stable. This improves assembly efficiency and solves the problem that welding can easily damage the metal shell 1 and cause damage to the temperature sensing components inside the temperature probe due to the high temperature generated during welding. This greatly reduces the scrap rate of thermocouples.

[0035] During stamping, the upper and lower end faces of the grounding terminal piece 8 form relatively recessed upper indentations 801 and lower indentations 802 corresponding to the circumferential stamping area; during assembly, the grounding terminal piece 8 is pressed by the upper and lower pressure heads of the equipment (such as... Figure 5 (As shown by the mark N) After relative movement in the circumferential stamping zone M, after the upper indentation 801 and the lower indentation 802 are pressed out respectively, the hole wall 811 of the through hole 81 will narrow or protrude 812.

[0036] Additionally, see Figure 6 As shown, one end of the ground terminal piece 8 is provided with an insertion hole 81, and the other end of the ground terminal piece 8 extends with a terminal 82. A connection through hole 83 is also provided on the ground terminal piece 8 between the terminal 82 and the insertion hole 81. The metal head thermocouple is assembled onto the bracket or platform of the temperature sensing environment by using the connection through hole 83 and the screw.

[0037] The above describes the preferred embodiments of this utility model, illustrating and describing its basic principles, main features, and advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A high-temperature resistant metal-head thermocouple, characterized in that: It includes a metal shell (1) that is closed at the top and open at the bottom and a thermocouple (2). The thermocouple (2) is disposed inside the metal shell (1) and abuts against or close to the closed surface (101). The two leads (3) of the thermocouple (2) extend out of the metal shell (1) through the open opening (102). A signal line shielding sleeve (4) is also sleeved between the end of the lead (3) close to the thermocouple (2) and the metal shell (1). It also includes a ground terminal piece (8), on which a through hole (81) adapted to the diameter of the metal shell (1) is provided. The ground terminal piece (8) is tightly fitted onto the metal shell (1) through the through hole (81) and forms an electrical connection with the metal shell (1). The ground terminal piece (8) has a circumferential stamping area (M) on the outer periphery near the metal shell (1). During stamping, the circumferential stamping area (M) causes the hole wall (811) of the through hole (81) to narrow or form a protrusion (812). The ground terminal piece (8) clamps the metal shell (1) by narrowing or protruding (812).

2. The high-temperature resistant metal-head thermocouple according to claim 1, characterized in that: The lead wire (3) is also fitted with a silicone sleeve (5) at one end near the thermocouple (2). The silicone sleeve (5) is fitted on the outside between the signal line shielding sleeve (4) and the metal shell (1).

3. The high-temperature resistant metal-head thermocouple according to claim 1, characterized in that: Thermally conductive silicone grease (6) is also filled between the metal casing (1) and the thermocouple.

4. A high-temperature resistant metal-head thermocouple according to claim 1, characterized in that: It also includes a heat shrink sleeve (7), a part of which is fitted on the outer end of the signal line shield sleeve (4), and the other part of which is fitted on the outside of the two leads (3).

5. A high-temperature resistant metal-head thermocouple according to claim 1, characterized in that: The metal casing (1) has a flattened part (103) on the side wall near the opening (102).

6. A high-temperature resistant metal-head thermocouple according to claim 2, characterized in that: The outer ends of the signal line shielding sleeve (4) and the silicone sleeve (5) extend out of the metal shell (1) through the opening (102); and the length of the signal line shielding sleeve (4) is greater than that of the silicone sleeve (5).

7. A high-temperature resistant metal-head thermocouple according to claim 1, characterized in that: The lead wire (3) includes a metal wire (31) and a braided sleeve (32) that is wrapped around the metal wire (31); the braided sleeve (32) is made of flexible fiber filaments, and the signal line shielding sleeve (4) is made of flexible metal wires.

8. A high-temperature resistant metal-head thermocouple according to claim 1, characterized in that: When the ground terminal piece (8) is stamped, the upper and lower end faces of the ground terminal piece (8) form relatively recessed upper indentation (801) and lower indentation (802) in the circumferential stamping area.

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