Temperature measurement plug of ring main unit

Abstract

The utility model discloses a ring main unit temperature measurement plug, which belongs to the technical field of temperature measurement plugs, and comprises a base and a circuit board, the outer side wall of the base is provided with a shell, one side of the base is provided with a rectangular groove, the other side of the base is provided with an overheat protection assembly, and one end of the shell far away from the base is provided with a metal connecting piece. An electromagnetic induction assembly is arranged at the end, located in the shell, of the metal connecting piece, and the circuit board is arranged in the overheating protection assembly. According to the utility model, the electromagnetic induction assembly is arranged, the cylindrical electrode plate, the metal connecting piece and the epoxy resin form a suspension capacitor, an alternating electric field is utilized to supply power to the circuit board and the energy storage capacitor bank, passive work is realized, stress concentration of the cylindrical electrode plate is reduced through the round hole, and the overheating protection assembly is arranged to protect the electromagnetic induction assembly. When the detected temperature is greater than or equal to 80 DEG C, the circuit board electrifies the miniature electromagnet, the mounting ring is attracted to compress the reset spring, the circuit board is driven to be separated from the heat conduction copper sheet, and a heat conduction path is blocked.

Description

Technical Field

[0001] This utility model relates to the field of temperature measuring plug technology, and in particular to a temperature measuring plug for a ring main unit. Background Technology

[0002] Ring main units are commonly used in power distribution systems. After long-term operation, the equipment and components inside may experience malfunctions or overheating, especially at the connection points inside the cabinet, which are often the points of failure. By installing temperature sensors at the plug positions of the ring main unit, the internal temperature of the ring main unit can be monitored in real time. When the temperature rises abnormally, an alarm can be set in time and measures can be taken to prevent equipment damage, fires and other safety accidents.

[0003] The existing temperature sensing plug has a circuit board with integrated temperature sensing elements inside. The temperature of the temperature sensing contact is directly conducted to the circuit board. The high temperature critical temperature at which the circuit board is prone to failure is between 80℃ and 120℃. However, the abnormal temperature value at the cable joint of the ring main unit is also between 80℃ and 120℃. This causes the existing temperature sensing plug to be prone to integrated circuit failure, lead wire solder joint breakage and other faults after long-term operation, which in turn leads to the failure of the temperature sensing plug and requires frequent replacement.

[0004] To address this issue, a temperature measuring plug for ring main units is proposed. Utility Model Content

[0005] The purpose of this utility model is to solve the problem that temperature measuring plugs in the prior art are prone to failure after long-term operation, and to propose a temperature measuring plug for ring main units.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A temperature measuring plug for a ring main unit includes a base and a circuit board. An outer shell is fixedly connected to the outer wall of the base. A rectangular groove is opened on one side of the base. An overheat protection component is provided on the other side of the base. A metal connector is fixedly connected to the end of the outer shell away from the base. An electromagnetic induction component is provided at the end of the metal connector located inside the outer shell.

[0008] The overheat protection assembly includes a cylinder and a miniature electromagnet. A mounting ring is slidably disposed inside the cylinder. The circuit board is fixedly mounted on the side of the mounting ring facing the metal connector. A reset spring is disposed between the mounting ring and the base.

[0009] A spring antenna and an energy storage capacitor bank are fixedly installed on the side of the circuit board away from the metal connector, and a temperature measuring contact is fixedly installed on the other side of the circuit board.

[0010] Preferably, the miniature electromagnet is located at the center of one end of the cylinder near the base, the miniature electromagnet is fixedly connected to the base, and the miniature electromagnet is electrically connected to the circuit board.

[0011] Preferably, one end of the reset spring is fixedly connected to the surface of the base, and the other end of the reset spring is fixedly connected to the side of the mounting ring away from the circuit board.

[0012] Preferably, the metal connector has a threaded end located outside the housing, and a bent heat-conducting copper sheet is welded to the outer wall and end of the other end of the metal connector. A wire is welded to the surface of the heat-conducting copper sheet located outside the metal connector, and the wire is electrically connected to the circuit board.

[0013] Preferably, the electromagnetic induction assembly includes a cylindrical electrode sheet and a paper ring. The diameter of the cylindrical electrode sheet is smaller than that of the mounting ring. The inner wall of one end of the cylindrical electrode sheet is bonded to the outer wall of the paper ring. The inner wall of the paper ring is bonded to the outer wall of the metal connector. Epoxy resin is filled between the cylindrical electrode sheet and the metal connector.

[0014] Preferably, the outer wall of the cylindrical electrode sheet has multiple circular holes.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model sets up an electromagnetic induction component, which forms a floating capacitor through a cylindrical electrode sheet, a metal connector and epoxy resin. It uses the alternating electric field of the cable connector to generate an induced current to power the circuit board and the energy storage capacitor bank, thus achieving passive operation. The circular hole alleviates the volume change of the cylindrical electrode sheet during operation, reduces stress concentration and extends the service life.

[0017] 2. This utility model incorporates an overheat protection component. When the temperature of the elbow-type cable connector reaches 80°C, the circuit board energizes the miniature electromagnet, which in turn attracts the mounting ring, compresses the reset spring, and causes the circuit board to detach from the heat-conducting copper sheet, thus blocking the heat conduction path and preventing high-temperature damage to circuit components. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a temperature measuring plug for a ring main unit proposed in this utility model;

[0019] Figure 2 This is a structural assembly drawing of a temperature measuring plug for a ring main unit proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of a temperature measuring plug for a ring main unit proposed in this utility model;

[0021] Figure 4This is a cross-sectional view of the internal structure of a temperature measuring plug for a ring main unit under normal conditions, as proposed in this utility model.

[0022] Figure 5 This is a cross-sectional view of the internal structure of a temperature measuring plug for a ring main unit under overheat protection conditions, as proposed in this utility model.

[0023] Figure 6 This is an assembly diagram of the overheat protection component and circuit board in a temperature measuring plug for a ring main unit proposed in this utility model;

[0024] Figure 7 This is a schematic diagram of the back structure of the circuit board in the temperature measuring plug of a ring main unit proposed in this utility model.

[0025] In the diagram: 1. Base; 2. Circuit board; 201. Spring antenna; 202. Energy storage capacitor bank; 203. Temperature measuring contact; 3. Housing; 4. Rectangular slot; 5. Metal connector; 6. Cylinder; 7. Miniature electromagnet; 8. Mounting ring; 9. Return spring; 10. Thermally conductive copper sheet; 11. Wire; 12. Cylindrical electrode sheet; 13. Paper ring; 14. Epoxy resin; 15. Round hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0027] Reference Figure 1-7 A temperature measuring plug for a ring main unit includes a base 1 and a circuit board 2. An outer shell 3 is fixedly connected to the outer wall of the base 1. A rectangular groove 4 is opened on one side of the base 1. An overheat protection component is provided on the other side of the base 1. A metal connector 5 is fixedly connected to the end of the outer shell 3 away from the base 1. An electromagnetic induction component is provided at the end of the metal connector 5 located inside the outer shell 3.

[0028] The overheat protection assembly includes a cylinder 6 and a miniature electromagnet 7. A mounting ring 8 is slidably disposed inside the cylinder 6. A circuit board 2 is fixedly mounted on the side of the mounting ring 8 facing the metal connector 5. A reset spring 9 is disposed between the mounting ring 8 and the base 1.

[0029] A spring antenna 201 and an energy storage capacitor bank 202 are fixedly installed on the side of the circuit board 2 away from the metal connector 5, and a temperature measuring contact 203 is fixedly installed on the other side of the circuit board 2.

[0030] It should be noted that the circuit board 2 integrates a temperature measuring unit and a communication unit. The spring antenna 201 is electrically connected to the communication unit, and the temperature measuring contact 203 is electrically connected to the temperature measuring unit. This is existing technology and will not be described in detail below.

[0031] Furthermore, the miniature electromagnet 7 is located at the center of one end of the cylinder 6 near the base 1, the miniature electromagnet 7 is fixedly connected to the base 1, and the miniature electromagnet 7 is electrically connected to the circuit board 2.

[0032] The further advantage of the above is that after the alarm temperature is reached, the miniature electromagnet 7 is energized through the circuit board 2. After the miniature electromagnet 7 is energized, it magnetically attracts the circuit board 2, causing the fixing ring to slide the circuit board 2 away from the heat-conducting copper sheet 10 inside the cylinder 6. This releases the heat-conducting copper sheet 10 from the temperature measuring contact 203, reduces the rate at which heat is conducted to the circuit board 2, and prevents the circuit board 2 from being in a high-temperature state for a long time.

[0033] Furthermore, one end of the reset spring 9 is fixedly connected to the surface of the base 1, and the other end of the reset spring 9 is fixedly connected to the side of the mounting ring 8 away from the circuit board 2.

[0034] Furthermore, the metal connector 5 has a threaded end located outside the housing 3, and a bent heat-conducting copper sheet 10 is welded to the outer wall and end of the other end of the metal connector 5. A wire 11 is welded to the surface of the heat-conducting copper sheet 10 located outside the metal connector 5, and the wire 11 is electrically connected to the circuit board 2.

[0035] Furthermore, the electromagnetic induction assembly includes a cylindrical electrode sheet 12 and a paper ring 13. The diameter of the cylindrical electrode sheet 12 is smaller than that of the mounting ring 8. The inner wall of one end of the cylindrical electrode sheet 12 is bonded to the outer wall of the paper ring 13. The inner wall of the paper ring 13 is bonded to the outer wall of the metal connector 5. Epoxy resin 14 is filled between the cylindrical electrode sheet 12 and the metal connector 5. Multiple circular holes 15 are opened on the outer wall of the cylindrical electrode sheet 12.

[0036] It should be noted that the elbow-type cable joint of the ring main unit in the existing technology will generate an alternating electric field during operation, which will not be elaborated on later.

[0037] A further advantage of the above is that, by using epoxy resin 14 as a dielectric, a floating capacitor is formed between the cylindrical electrode sheet 12 and the metal connector 5. Under the action of an alternating electric field, a current is formed between the cylindrical electrode sheet 12 and the metal connector 5 through a potential difference. The current enters the circuit board 2 through the wire 11 to supply power, and is stored in the energy storage capacitor, thus realizing the function of passive operation. The circular hole 15 alleviates the volume change of the cylindrical electrode sheet 12 during operation, reduces stress concentration, and extends the service life.

[0038] When using this utility model, after connecting the metal connector 5 to the elbow-type cable connector of the ring main unit, the installer uses a tool to insert it into the rectangular groove 4 and rotate it to complete the fastening.

[0039] During operation, under the action of an alternating electric field, a current is formed between the cylindrical electrode 12 and the metal connector 5 through a potential difference. The current enters the circuit board 2 through the wire 11 to supply power, and is stored in the energy storage capacitor, realizing the passive operation function. The heat of the elbow cable connector is conducted to the heat-conducting copper sheet 10 through the metal connector 5, and then to the temperature measuring contact 203 through the heat-conducting copper sheet 10. Finally, the temperature data is transmitted through the spring antenna 201 to realize the temperature measurement function.

[0040] When the temperature of the elbow-type cable joint reaches 80℃, the existing monitoring system will issue an alarm. At this time, no further monitoring is needed. The miniature electromagnet 7 is energized through the circuit board 2. After the miniature electromagnet 7 is energized, it magnetically attracts the circuit board 2. During the attraction process, the circuit board 2 squeezes the fixing ring and the return spring 9, causing the fixing ring to slide the circuit board 2 away from the heat-conducting copper sheet 10 inside the cylinder 6. This causes the temperature measuring contact 203 to leave the heat-conducting copper sheet 10. By releasing the contact between the heat-conducting copper sheet 10 and the temperature measuring contact 203, the rate of heat conduction to the circuit board 2 is reduced, preventing the circuit board 2 from being in a high-temperature state for a long time. This avoids the circuit board 2 from malfunctioning, such as integrated circuit failure or broken lead solder joints, and improves the service life of the temperature measuring plug.

[0041] After troubleshooting is completed, the circuit board 2 receives the reset signal sent by the control center through the spring antenna 201, and then cuts off the power to the miniature electromagnet 7. Then, the reset spring 9 pushes the fixed ring to reset. After the fixed ring is reset, the heat-conducting copper sheet 10 re-contacts the temperature measuring contact 203 and continues to measure the temperature, thus realizing the overheat protection function.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A temperature measuring plug for a ring main unit, comprising a base (1) and a circuit board (2), characterized in that, The outer wall of the base (1) is fixedly connected to the outer shell (3), a rectangular groove (4) is opened on one side of the base (1), an overheat protection component is provided on the other side of the base (1), a metal connector (5) is fixedly connected to the end of the outer shell (3) away from the base (1), and an electromagnetic induction component is provided at the end of the metal connector (5) located inside the outer shell (3). The overheat protection assembly includes a cylinder (6) and a miniature electromagnet (7). An installation ring (8) is slidably disposed inside the cylinder (6). The circuit board (2) is fixedly installed on the side of the installation ring (8) facing the metal connector (5). A reset spring (9) is disposed between the installation ring (8) and the base (1). A spring antenna (201) and an energy storage capacitor bank (202) are fixedly installed on the side of the circuit board (2) away from the metal connector (5), and a temperature measuring contact (203) is fixedly installed on the other side of the circuit board (2).

2. The ring main unit temperature measuring plug according to claim 1, characterized in that: The miniature electromagnet (7) is located at the center of the end of the cylinder (6) near the base (1). The miniature electromagnet (7) is fixedly connected to the base (1) and electrically connected to the circuit board (2).

3. The ring main unit temperature measuring plug according to claim 1, characterized in that: One end of the reset spring (9) is fixedly connected to the surface of the base (1), and the other end of the reset spring (9) is fixedly connected to the side of the mounting ring (8) away from the circuit board (2).

4. The ring main unit temperature measuring plug according to claim 1, characterized in that: The metal connector (5) has a thread at one end outside the outer shell (3), and a bent heat-conducting copper sheet (10) is welded to the outer wall and end of the other end of the metal connector (5). A wire (11) is welded to the surface of the heat-conducting copper sheet (10) outside the metal connector (5), and the wire (11) is electrically connected to the circuit board (2).

5. A temperature measuring plug for a ring main unit according to claim 1, characterized in that: The electromagnetic induction assembly includes a cylindrical electrode sheet (12) and a paper ring (13). The diameter of the cylindrical electrode sheet (12) is smaller than that of the mounting ring (8). The inner wall of one end of the cylindrical electrode sheet (12) is bonded to the outer wall of the paper ring (13). The inner wall of the paper ring (13) is bonded to the outer wall of the metal connector (5). Epoxy resin (14) is filled between the cylindrical electrode sheet (12) and the metal connector (5).

6. A temperature measuring plug for a ring main unit according to claim 5, characterized in that: The outer wall of the cylindrical electrode sheet (12) is provided with a plurality of circular holes (15).

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