Temperature sensor suitable for duckbilled contact

Abstract

The utility model relates to a temperature sensor suitable for a duckbilled contact. The temperature sensor comprises a mounting base, an outer cover and a temperature sensor body, the mounting base is made of a metal material, takes the shape of a tea table, and comprises a sensor fixing table, buckling edges which are respectively positioned on two sides of the sensor fixing table, and S-shaped buckles which are respectively positioned at two ends of the buckling edges; the outer cover is made of a non-metal material and is fixed on the sensor fixing table; the temperature sensor body is arranged in the outer cover and comprises a temperature sensing chip and an antenna; the temperature sensing chip is a passive temperature sensing chip; according to the structural characteristics of the duckbilled contact, the sensor mounting base is designed into a buckle type, so that the sensor is simple, convenient, firm and reliable to mount and is not influenced by expansion of the duckbilled contact after being mounted, and meanwhile, the height of the sensor body, the height of the sensor outer cover and the thickness of the sensor mounting base are controlled; the purpose that the temperature sensor does not exceed the maximum boundary dimension of the duckbilled contact after being installed is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature sensors, in particular to a temperature sensor suitable for a duckbill contactor. Background Art

[0002] Duckbill contact is a type of circuit breaker contact. It has the characteristics of large load current, simple structure and low cost. It is widely used in various types of circuit breakers.

[0003] The duckbill contact is composed of varying numbers of contact pieces and tension springs. When the circuit breaker is closed, the moving contact is inserted into the static contact, the duckbill contact is stretched open, and the moving and static contacts are brought into close contact by the force of the tension spring, and a large pressure is maintained on the contact surface between the two to reduce the contact resistance of the moving and static contacts and reduce the heating of the contacts. However, the duckbill contact is in a high voltage, high current, and high temperature environment for a long time. Under the combined effect of factors such as surface oxidation and degradation of the tension spring performance, the contact resistance of the moving and static contacts will inevitably increase gradually, resulting in serious heating of the contacts. Therefore, it is necessary to monitor the temperature of the duckbill contact.

[0004] Since the shape of the duckbill contact changes significantly before and after it is combined with the static contact, the front part of the contact (duckbill) opens, so its circumference changes significantly; when the moving and static contacts of the circuit breaker are combined, it means that the circuit breaker is in a closed and energized working state. Circuit breakers using duckbill contacts are generally medium-voltage circuit breakers, and the working voltage is generally 6KV~40.5KV. It is obviously impossible to install the contact temperature sensor when the circuit breaker is in the closed state, so the temperature sensor can only be installed when the duckbill contact is in the open state; therefore, conventional bundled temperature sensors are not applicable, because the bundled installation method cannot accurately estimate the circumference of the duckbill contact after closing, and there is a risk of loosening and falling if the tie is too long, and there is a risk of breaking if the tie is too short.

[0005] There are three types of sensor technologies used for circuit breaker contact temperature monitoring: CT power supply, RFID, and SAW. Temperature sensors based on the CT power supply principle need to be installed in a bundled manner. Therefore, all these types of sensors are not suitable for duckbill contacts.

[0006] At present, the temperature sensors for switch cabinets and circuit breakers on the market are mainly designed for plum blossom contacts, switch cabinet terminals, busbars, etc., and there are no temperature sensors specifically for duckbill contacts. Conventional switch cabinet temperature sensors, in addition to bundling installation, usually adopt snap-on installation or tuning fork installation, such as the snap-on installation described in CN220490257U and CN307630708S, and the tuning fork installation described in CN307630685S and CN308053304S. These conventional temperature sensors are not suitable for duckbill contacts.

[0007] At the same time, when the switch cabinet is closed, the moving contact of the circuit breaker (duckbill contact) is pushed into the switch cabinet and combined with the static contact. The moving and static contacts are wrapped by the outer insulating sheath to ensure the safety of the moving and static contacts; when the switch cabinet is closed, due to the presence of high voltage and large current, the moving and static contacts generate uniform electric and magnetic fields to the outside and are enclosed in the insulating sheath cavity by the insulating sheath; if the temperature sensor installed on the contact exceeds the original maximum external dimensions of the duckbill contact, it will disrupt the original uniform electric and magnetic fields, causing the local electric and magnetic fields to be too strong, causing excessive impact on the insulating sheath, accelerating the aging of the insulating sheath, reducing its insulation performance, and posing huge safety risks to the equipment. Utility Model Content

[0008] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a temperature sensor suitable for duckbill contacts, which is not only easy to install, firm and reliable, but also not affected by the expansion of the duckbill volume contact after installation, and does not exceed the maximum external dimensions of the duckbill contact itself, thereby avoiding safety hazards to the circuit breaker.

[0009] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a temperature sensor suitable for duckbill contacts, comprising a mounting base, an outer cover and a temperature sensor body;

[0010] The mounting base is made of metal and is in the shape of a tea table, including a sensor fixing platform, buckle edges respectively located on both sides of the sensor fixing platform, and S-shaped buckles respectively located at both ends of the buckle edges;

[0011] The outer cover is made of non-metallic material and is fixed on the sensor fixing platform;

[0012] The temperature sensor body is arranged in the outer cover, and comprises a temperature sensing chip and an antenna; the temperature sensing chip is a passive temperature sensing chip.

[0013] Preferably, the end of the S-shaped buckle faces outwards and presents an open structure.

[0014] Preferably, the temperature sensing chip is an RFID temperature sensing chip or a SAW temperature sensing chip.

[0015] Preferably, the temperature sensing chip is welded on any one side of the length, width and height of the antenna.

[0016] Preferably, the antenna is a printed antenna, and the antenna substrate is made of a plate with a high dielectric constant and low loss.

[0017] Preferably, the outer cover is made of flame retardant, insulating and high temperature resistant material.

[0018] Preferably, the outer cover is bonded to the mounting base by glue.

[0019] Preferably, the outer cover is directly fixed to the mounting base by means of rubber encapsulation.

[0020] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0021] The utility model designs the sensor mounting base into a snap-on type according to the structural characteristics of the duckbill contact, so that the sensor can be installed simply, firmly and reliably, and will not be affected by the expansion of the duckbill volume contact after installation. At the same time, the height of the sensor body, the height of the sensor cover and the thickness of the sensor mounting base are controlled, so that the temperature sensor does not exceed the maximum external dimensions of the duckbill contact after installation, thereby avoiding safety hazards to the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0023] Attached Figure 1 It is an exploded view of the temperature sensor applicable to the duckbill contact according to the utility model;

[0024] Attached Figure 2 This is a schematic diagram of the installation of the temperature sensor suitable for the duckbill contact of the utility model

[0025] Attached Figure 3 This is a schematic diagram of the structure of the mounting base in the utility model.

[0026] Among them: 1. Installation base; 11. Sensor fixing platform; 12. Buckle edge; 13. S-shaped buckle; 2. Outer cover; 3. Temperature sensor body; 31. Temperature sensing chip; 32. Antenna; 4. Duckbill contact; 41. Contact finger protection cover; 42. Contact finger. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Attached Figure 1-3 The temperature sensor suitable for the duckbill contact of the utility model comprises a mounting base 1, an outer cover 2 and a temperature sensor body 3.

[0029] Further, the mounting base 1 is made of metal material, preferably copper plated with silver;

[0030] The thickness of the mounting base 1 is preferably 0.5 mm;

[0031] The mounting base 1 is in the shape of a tea table and includes a sensor fixing platform 11 and two pairs of buckle edges 12;

[0032] The sensor fixing platform 11 is located in the middle of the mounting base 1 and is square in shape;

[0033] The length of the sensor fixing platform 11 is slightly smaller than the width of the contact finger protection cover 41 and larger than the length of the sensor outer cover 2;

[0034] The width of the sensor fixing platform 11 is slightly larger than the width of the sensor cover 2;

[0035] After the sensor is installed, the sensor fixing base is fitted with the contact finger protection cover 41;

[0036] Two pairs of buckle edges 12 are respectively arranged on both sides of the sensor fixing platform 11;

[0037] Each buckle edge 12 has an S-shaped buckle 13 at both ends;

[0038] The end of the S-shaped buckle 13 is in the shape of an open trumpet, which facilitates pressing the buckle into the contact finger 42 of the duckbill contact 4 when installing the sensor;

[0039] The length of the buckle edge 12 matches the width of the duckbill contact 4, ensuring that the mounting base 1 fits the contact finger protection cover 41 on the top of the duckbill contact 4 after installation and does not come loose;

[0040] The width of the buckle edge 12 is as wide as possible without interfering with the duckbill contact 4;

[0041] The width of the buckle edge 12 shall not be less than 10 mm.

[0042] Further, the outer cover 2 is made of non-metallic material;

[0043] The outer cover 2 is made of flame retardant, insulating and high temperature resistant material, preferably polyimide;

[0044] The internal space of the outer cover 2 is slightly larger than the sensor body and does not interfere with the sensor body after installation;

[0045] The outer cover 2 is bonded to the mounting base 1 by glue; the outer cover 2 may also be replaced by a rubber coating.

[0046] Furthermore, the temperature sensor body 3 includes a temperature sensing chip 31 and an antenna 32;

[0047] The temperature sensing chip 31 must be a passive temperature sensing chip;

[0048] The temperature sensing chip 31 can be an RFID temperature sensing chip or a SAW temperature sensing chip; preferably, an RFID temperature sensing chip;

[0049] The temperature sensing chip 31 is welded on the antenna 32;

[0050] The temperature sensing chip 31 can be welded to any side of the length, width, and height of the antenna 32, and the welding position depends on the design of the antenna 32;

[0051] The antenna 32 is a printed antenna, and the antenna substrate is a plate with a high dielectric constant and low loss, preferably a ceramic substrate;

[0052] Due to the high dielectric constant, the size of the antenna 32 can be miniaturized and the height can be made lower, which greatly reduces the height of the entire sensor.

[0053] The dielectric constant of the antenna 32 substrate must not be less than 80.

[0054] The contact finger protection cover 41 at the top of the duckbill contact 4 has a height difference of 6 mm from the highest point of the side wall of the duckbill contact 4. The height of the conventional RFID temperature sensor is 9 mm, and the height of the conventional SAW temperature sensor is more than 20 mm. Therefore, when the conventional RFID and SAW temperature sensors are installed on the duckbill contact 4, they will exceed the original maximum outer dimensions of the duckbill contact 4 and cannot meet the requirement of not exceeding the maximum outer dimensions of the duckbill contact 4 after installation.

[0055] The sensor mounting base 1 of the utility model has a thickness of 0.5 mm, a sensor body height of 3 mm, a sensor cover 2 thickness of 1 mm, and an overall sensor height of 4.5 mm, which is smaller than the height difference (6 mm) between the highest point of the contact cover 2 and the contact side wall, and will not exceed the maximum external dimensions of the duckbill contact 4 after installation.

[0056] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A temperature sensor suitable for a duckbill contact, characterized in that: It includes a mounting base, an outer cover and a temperature sensor body; The mounting base is made of metal and is in the shape of a tea table, including a sensor fixing platform, buckle edges respectively located on both sides of the sensor fixing platform, and S-shaped buckles respectively located at both ends of the buckle edges; The outer cover is made of non-metallic material and is fixed on the sensor fixing platform; The temperature sensor body is arranged in the outer cover, and comprises a temperature sensing chip and an antenna; the temperature sensing chip is a passive temperature sensing chip.

2. The temperature sensor suitable for duckbill contact according to claim 1, characterized in that: The end of the S-shaped buckle faces outwards and presents an open structure.

3. The temperature sensor suitable for duckbill contact according to claim 2, characterized in that: The temperature sensing chip is an RFID temperature sensing chip or a SAW temperature sensing chip.

4. The temperature sensor suitable for duckbill contact according to claim 3, characterized in that: The temperature sensing chip is welded on any one side of the length, width and height of the antenna.

5. The temperature sensor suitable for duckbill contact according to claim 4, characterized in that: The antenna is a printed antenna, and the antenna substrate is a plate with high dielectric constant and low loss.

6. The temperature sensor suitable for duckbill contact according to any one of claims 1 to 5, characterized in that: The outer cover is made of flame-retardant, insulating and high-temperature resistant material.

7. The temperature sensor suitable for duckbill contact according to claim 6, characterized in that: The outer cover is bonded to the mounting base by glue.

8. The temperature sensor suitable for duckbill contact according to claim 6, characterized in that: The outer cover directly fixes the temperature sensor body on the mounting base in a rubber-wrapped manner.

Images