Passive temperature sensor

Abstract

The utility model provides a passive temperature sensor, which comprises an electrode upper shell, an insulating base, a circuit board and a metal connecting piece, the electrode upper shell and the insulating base are matched to form an accommodating cavity, the circuit board is arranged in the accommodating cavity, the metal connecting piece is arranged on the insulating base, and a first end of the metal connecting piece extends into the accommodating cavity; a first electrode of the circuit board is electrically connected with the electrode upper shell, and a second electrode of the circuit board is electrically connected with a first end of the metal connecting piece; a bolt blind hole is formed in the second end of the metal connecting piece, and an opening of the bolt blind hole is arranged back to the electrode upper shell; the insulating base is provided with an annular skirt edge surrounding an opening of the bolt blind hole, the annular skirt edge extends in the direction of the opening of the bolt blind hole, and the second end of the metal connecting piece is concavely arranged relative to the annular skirt edge. According to the passive temperature sensor, the creepage distance between the electrodes can be increased, the insulating strength is improved, and the working stability is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of passive temperature sensors, and in particular to a passive temperature sensor. Background Art

[0002] In high-voltage power transmission and transformation systems, in order to ensure the safe operation of the system, key parts need to be monitored in real time. Sensors, as terminal products of the monitoring system, are usually close to or directly contact high-voltage objects, such as busbars, cable overhead joints, high and low voltage sides of transformers, etc., in order to obtain important data such as temperature and current. The most common sources of sensor working energy are battery power supply, temperature difference power generation, CT power supply (current mutual inductance) or RF transmission, etc., but they all have various limitations and shortcomings.

[0003] In an existing sensor, a metal connector is provided to connect to a high-voltage object. At the same time, a conductive shell is provided so that the metal connector and the conductive shell become the two poles of the circuit board power supply. Since there is a parasitic capacitance between the conductive shell and the earth, a loop is actually formed between the high-voltage object and the earth, generating a weak current to meet the power supply requirements of the sensor.

[0004] However, the creepage distance between the conductive shell and the metal connector of the sensor is too short, which causes the conductive shell and the metal connector to be easily connected in series by water vapor or water droplets in fog or rainy days, forming a conductive line, destroying the electric field power supply and causing the product to be unable to obtain energy and work normally.

[0005] Therefore, a better optimized sensor structure needs to be considered. Utility Model Content

[0006] The main purpose of the utility model is to provide a passive temperature sensor which can increase the creepage distance between electrodes, improve the insulation strength and ensure the working stability.

[0007] In order to achieve the above-mentioned main purpose, the passive temperature sensor provided by the utility model includes an electrode upper shell, an insulating base, a circuit board and a metal connector. The electrode upper shell and the insulating base cooperate to form a accommodating cavity. The circuit board is installed in the accommodating cavity. The metal connector is arranged on the insulating base, and the first end of the metal connector extends into the accommodating cavity; the first electrode of the circuit board is electrically connected to the electrode upper shell, and the second electrode of the circuit board is electrically connected to the first end of the metal connector; a bolt blind hole is arranged at the second end of the metal connector, and the opening of the bolt blind hole is arranged back to the electrode upper shell; the insulating base is provided with an annular skirt surrounding the opening of the bolt blind hole, and the annular skirt extends in the direction of the opening of the bolt blind hole, and the second end of the metal connector is concave relative to the annular skirt.

[0008] It can be seen from the above scheme that the passive temperature sensor of the utility model is provided with an annular skirt surrounding the opening of the blind bolt hole on the insulating base, so that the second end of the metal connector is concave relative to the annular skirt, thereby increasing the creepage distance between the electrode upper shell and the metal connector and improving the insulation strength. At the same time, in rainy weather, the annular skirt can keep the concave part dry, improve the insulation capacity, and greatly reduce the risk of conduction between the electrode upper shell and the metal connector in harsh environments, which can ensure the stable operation of the sensor in harsh environments.

[0009] In a further solution, a groove is provided at the first end of the metal connector, and a temperature probe is provided on the circuit board, and the temperature probe extends into the groove.

[0010] It can be seen that by providing a groove on the metal connector and extending the temperature probe into the groove, the temperature probe can be brought close to the metal connector, so that the detected temperature is closer to the temperature of the position to be detected, thereby improving the detection accuracy.

[0011] In a further solution, a heat conducting sheet is provided in the groove, the temperature probe abuts against a first side of the heat conducting sheet, and a second side of the heat conducting sheet abuts against the metal connecting piece.

[0012] It can be seen that by arranging a heat conductive sheet in the groove, the temperature probe is abutted against the metal connector through the heat conductive sheet, which can ensure that the temperature probe can quickly and accurately measure the temperature conducted by the metal connector.

[0013] In a further solution, a boss is further provided at the first end of the metal connector, and the circuit board is provided with a torsion spring connected to the second electrode, and the torsion spring is sleeved on the outer periphery of the boss.

[0014] It can be seen that the circuit board is connected to the boss of the metal connector by arranging a torsion spring, and the elasticity of the torsion spring is utilized to avoid poor contact between the second electrode and the metal connector during the assembly process.

[0015] In a further embodiment, the groove is located on the boss.

[0016] It can be seen that setting the groove on the boss can make full use of the space and simplify the structural setting.

[0017] In a further solution, the outer peripheral wall of the insulating base is provided with a multi-faceted structure whose cross section is an even-numbered regular polygon; in the multi-faceted structure, a chamfer is provided between any two adjacent planes.

[0018] It can be seen that the cross section of the outer wall of the insulating base is an even-numbered regular polygonal structure, which can facilitate the rotation operation of the insulating base during installation. At the same time, a chamfer is set between any two adjacent planes to reduce the damage to the operator's hands during manual operation.

[0019] In a further solution, the electrode upper shell is detachably connected to the insulating base.

[0020] It can be seen from this that the electrode upper shell and the insulating base are detachably connected, which can facilitate the disassembly and assembly of the product.

[0021] In a further solution, the circuit board is provided with a compression spring connected to the first electrode, and a spring installation groove is provided on one side of the electrode upper shell located at the accommodating cavity, and the compression spring is inserted into the spring installation groove.

[0022] It can be seen that the electrode upper shell is provided with a spring installation groove, which can facilitate the positioning and installation of the compression spring, improve the stability of the connection between the first electrode and the electrode upper shell, and ensure that the first electrode and the electrode upper shell form a circuit path.

[0023] In a further solution, an RFID anti-metal electronic tag is also provided on the circuit board.

[0024] It can be seen that by providing an RFID anti-metal electronic tag, it is convenient to read the RFID anti-metal electronic tag through a reader to obtain product information.

[0025] In a further solution, the outer periphery of the upper shell of the electrode is arranged in a hemispherical surface.

[0026] It can be seen that the outer periphery of the upper shell of the electrode is designed in a hemispherical shape, which can reduce wind resistance, repel dust, accumulation, etc. from adsorbing it, and reduce the interference of external factors on the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of an embodiment of the passive temperature sensor of the utility model.

[0028] Figure 2 It is a structural cross-sectional view of an embodiment of the passive temperature sensor of the utility model.

[0029] Figure 3 It is a structural exploded view of an embodiment of the passive temperature sensor of the utility model.

[0030] Figure 4 It is a structural diagram of the electrode upper shell in the embodiment of the passive temperature sensor of the utility model.

[0031] Figure 5 It is a structural diagram from the top perspective of a circuit board in an embodiment of the passive temperature sensor of the utility model.

[0032] Figure 6 It is a structural diagram from the bottom perspective of the circuit board in an embodiment of the passive temperature sensor of the utility model.

[0033] Figure 7 It is a structural diagram from the top perspective of the insulating base in an embodiment of the passive temperature sensor of the utility model.

[0034] Figure 8 It is a structural diagram from the bottom perspective of the insulating base in an embodiment of the passive temperature sensor of the utility model.

[0035] Fig. 9 It is a structural cross-sectional view of an insulating base in an embodiment of the passive temperature sensor of the utility model.

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0037] Passive temperature sensor first embodiment:

[0038] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the passive temperature sensor includes an electrode upper shell 1, an insulating base 2, a metal connector 3, a circuit board 4 and a bolt 5. The electrode upper shell 1 and the insulating base 2 cooperate to form a receiving cavity 6, the circuit board 4 is installed in the receiving cavity 6, the metal connector 3 is arranged on the insulating base 2, and the first end of the metal connector 3 extends into the receiving cavity 6. In order to improve the stability of the connection between the metal connector 3 and the insulating base 2, the metal connector 3 and the insulating base 2 are integrated, and the insulating base 2 wraps the outer periphery of the metal connector 3. In this embodiment, the electrode upper shell 1 is made of semiconductor material. The outer periphery of the electrode upper shell 1 is set in a hemispherical shape, which can reduce wind resistance, repel dust, accumulation and other adsorption, and reduce the interference of external factors on the product. The insulating base 2 is injection molded with a hot-melt material mixed with glass fiber. The metal connector 3 is made of stainless steel material, which serves as a heat conduction member for the temperature measurement point of the electric high-voltage system and has a conductive function.

[0039] The first electrode (not shown) of the circuit board 4 is electrically connected to the electrode upper shell 1, and the second electrode (not shown) of the circuit board 4 is electrically connected to the first end of the metal connector 3, wherein the first electrode and the second electrode are two electrodes for supplying power to the circuit board.

[0040] In this embodiment, see Figure 4 and Figure 5 The circuit board 4 is provided with a compression spring 41 connected to the first electrode, and the electrode upper shell 1 is provided with a spring installation groove 11 on one side of the accommodating cavity 6, and the compression spring 41 is inserted into the spring installation groove 11. The electrode upper shell 1 is provided with the spring installation groove 11, which can facilitate the positioning and installation of the compression spring 41, improve the stability of the connection between the first electrode and the electrode upper shell 1, and ensure that the first electrode and the electrode upper shell 1 form a circuit path.

[0041] See also Figure 6 and Figure 7The first end of the metal connector 3 is provided with a boss 32, and the circuit board 4 is provided with a torsion spring 42 connected to the second electrode, and the torsion spring 42 is sleeved on the outer periphery of the boss 32. The circuit board 4 is connected to the boss 32 of the metal connector 3 by providing the torsion spring 42, and the elasticity of the torsion spring 42 is utilized to avoid poor contact between the second electrode and the metal connector 3 due to rotation and other operations during the assembly process.

[0042] The first end of the metal connector 3 is also provided with a groove 33. In order to make full use of the space and simplify the structural setting, the groove 33 is located on the boss 32. The circuit board 4 is also provided with a temperature probe 43, and the temperature probe 43 extends into the groove 33. By providing the groove 33 on the metal connector 3 and allowing the temperature probe 43 to extend into the groove 33, the temperature probe 43 can be brought close to the metal connector 3, so that the detected temperature is closer to the temperature of the position to be detected, thereby improving the detection accuracy.

[0043] In this embodiment, the groove 33 is provided with a heat conductive sheet 7, the temperature probe 43 abuts against a first side of the heat conductive sheet 7, and a second side of the heat conductive sheet 7 abuts against the metal connector 3. By providing the heat conductive sheet 7 in the groove 33, the temperature probe 43 abuts against the metal connector 3 through the heat conductive sheet 7, which can ensure that the temperature probe 43 can quickly and accurately measure the temperature conducted by the metal connector 3. The heat conductive sheet 7 is made of heat conductive silica gel or heat conductive silicone grease.

[0044] See, Figure 8 and Fig. 9 The second end of the metal connector 3 is provided with a blind bolt hole 31, the opening of the blind bolt hole 31 is arranged to face away from the electrode upper shell 1, and the blind bolt hole 31 is used to connect the bolt 5. When the sensor is installed at the temperature detection position, the sensor can be fixed at the temperature detection position through the bolt 5 and the blind bolt hole 31. The insulating base 2 is provided with an annular skirt 21 surrounding the opening of the blind bolt hole 31, and the annular skirt 21 extends in the direction of the opening of the blind bolt hole 31. The second end of the metal connector 3 is concave relative to the annular skirt 21.

[0045] The outer wall of the insulating base 2 is provided with a multifaceted structure 22 whose cross section is an even-numbered regular polygon, and two opposite planes in the multifaceted structure 22 are parallel. In the multifaceted structure 22, a chamfer 221 is provided between any two adjacent planes. The cross section of the outer wall of the insulating base 2 is provided with an even-numbered regular polygon structure, which can facilitate the rotation operation of the insulating base 2 during installation. At the same time, a chamfer 221 is provided between any two adjacent sides, which can reduce the damage to the operator's hands during manual operation. Preferably, the chamfer 221 adopts an R9 fillet. In addition, the outer wall surface of the insulating base 2 forms a VDI27 texture sunburn pattern, and the texture is close to the peaks and valleys of human fingerprints. In addition to being beautiful and having a good feel, it also has an anti-slip effect.

[0046] The electrode upper shell 1 is detachably connected to the insulating base 2. In the present embodiment, the electrode upper shell 1 is provided with an internal thread 12, and the top position of the insulating base 2 is provided with an external thread 23, and the internal thread 12 and the external thread 23 are arranged in coordination. Of course, the electrode upper shell 1 and the insulating base 2 can also be detachably connected by a snap-on structure. The insulating base 2 is also provided with a waterproof ring placement groove 24, and the waterproof ring placement groove 24 is arranged near the external thread 23. A waterproof ring 8 is installed in the waterproof ring placement groove 24, so that when the electrode upper shell 1 and the insulating base 2 are installed, the gap between the internal thread 12 and the external thread 23 is sealed to play a waterproof role.

[0047] In addition, in the present embodiment, an RFID anti-metal electronic tag (not shown) is also provided on the circuit board 4. By providing an RFID anti-metal electronic tag, it is convenient to read the RFID anti-metal electronic tag through a reader to obtain product information. Of course, the circuit board 4 also integrates circuit modules such as a power supply circuit, a temperature acquisition circuit, and a wireless communication circuit, wherein the power supply circuit can be set with reference to the Chinese patent application with application number CN201620252145.5, which is a technology well known to those skilled in the art and will not be repeated here. In the present embodiment, the metal connector 3 is connected to the high-voltage end, the second electrode of the circuit board 4 is electrically connected to the metal connector 3, and the second electrode of the circuit board 4 is electrically connected to the electrode upper shell 1. Since there is a parasitic capacitance between the electrode upper shell 1 and the earth, a loop is actually formed between the high-voltage end and the earth, generating a weak current to supply power to the circuit board 4 to meet the power supply requirements of the sensor.

[0048] It can be seen from the above scheme that the passive temperature sensor of the utility model is provided with an annular skirt 21 surrounding the opening of the blind bolt hole 31 on the insulating base 2, so that the second end of the metal connector 3 is concave relative to the annular skirt 21, thereby increasing the creepage distance between the electrode upper shell 1 and the metal connector 3 and improving the insulation strength. At the same time, in rainy weather, the annular skirt 21 can keep the concave part dry, improve the insulation capacity, and greatly reduce the risk of conduction between the electrode upper shell 1 and the metal connector 3 in harsh environments, which can ensure the stable operation of the sensor in harsh environments.

[0049] It should be noted that the above are only preferred embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any non-substantial modifications made to the present invention using this concept also fall within the protection scope of the present invention.

Claims

1. A passive temperature sensor, characterized in that: The invention comprises an electrode upper shell (1), an insulating base (2), a circuit board (4) and a metal connecting piece (3), wherein the electrode upper shell (1) and the insulating base (2) cooperate to form a receiving cavity (6), the circuit board (4) is installed in the receiving cavity (6), the metal connecting piece (3) is arranged on the insulating base (2), and the first end of the metal connecting piece (3) extends into the receiving cavity (6); The first electrode of the circuit board (4) is electrically connected to the electrode upper shell (1), and the second electrode of the circuit board (4) is electrically connected to the first end of the metal connecting piece (3); A bolt blind hole (31) is provided at the second end of the metal connecting piece (3), and the opening of the bolt blind hole (31) is arranged to face away from the electrode upper shell (1); The insulating base (2) is provided with an annular skirt (21) surrounding the opening of the blind bolt hole (31); the annular skirt (21) extends in the direction of the opening of the blind bolt hole (31); and the second end of the metal connecting piece (3) is concavely arranged relative to the annular skirt (21).

2. The passive temperature sensor according to claim 1, characterized in that: The first end of the metal connecting piece (3) is provided with a groove (33), and the circuit board (4) is provided with a temperature probe (43), and the temperature probe (43) extends into the groove (33).

3. The passive temperature sensor according to claim 2, characterized in that: The groove (33) is provided with a heat conducting sheet (7), the temperature probe (43) abuts against a first side of the heat conducting sheet (7), and the second side of the heat conducting sheet (7) abuts against the metal connecting piece (3).

4. The passive temperature sensor according to claim 2, characterized in that: The first end of the metal connecting piece (3) is also provided with a boss (32), and the circuit board (4) is provided with a torsion spring (42) connected to the second electrode, and the torsion spring (42) is sleeved on the outer periphery of the boss (32).

5. The passive temperature sensor according to claim 4, characterized in that: The groove (33) is located on the boss (32).

6. The passive temperature sensor according to any one of claims 1 to 5, characterized in that: The outer peripheral wall of the insulating base (2) is provided with a multi-faceted structure (22) whose cross section is an even-numbered regular polygon; In the multi-faceted structure (22), a chamfer (221) is provided between any two adjacent planes.

7. The passive temperature sensor according to any one of claims 1 to 5, characterized in that: The electrode upper shell (1) is detachably connected to the insulating base (2).

8. The passive temperature sensor according to any one of claims 1 to 5, characterized in that: The circuit board (4) is provided with a compression spring (41) connected to the first electrode, and the electrode upper shell (1) is provided with a spring installation groove (11) on one side of the accommodating cavity (6), and the compression spring (41) is inserted into the spring installation groove (11).

9. The passive temperature sensor according to any one of claims 1 to 5, characterized in that: The circuit board (4) is also provided with an RFID anti-metal electronic tag.

10. The passive temperature sensor according to any one of claims 1 to 5, characterized in that: The outer periphery of the electrode upper shell (1) is arranged in a hemispherical surface.

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