Contact finger clamp spring type temperature sensor

Abstract

The utility model relates to a contact finger clamp spring type temperature sensor which comprises a sensor base and a sensor body. The sensor base is shaped like a Chinese character'ji ', has elasticity and comprises a top platform and connecting parts arranged on the two sides of the top platform respectively. The bottom of the top platform is provided with two positioning edges used for being clamped on a contact finger. The connecting end of each connecting part and the top platform is provided with a bevel edge, and the other end of each connecting part is provided with a barb edge for hooking the bottom of an adjacent contact finger; the sensor body is located on the top platform, adopts a passive working mode and comprises an antenna and a temperature sensor chip arranged on the antenna; the size of the antenna is not greater than the maximum appearance size of the tulip contact; the quincuncial contact is simple and compact in structure and convenient and firm to install, the temperature sensor does not exceed the original outline of the quincuncial contact after being installed, the insulation performance of equipment is not reduced, and the equipment is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature measurement, and particularly refers to a finger-contact spring-type temperature sensor. Background Art

[0002] The function of the plum blossom contact is to realize electrical connection for the moving and static contact arms of the switch cabinet circuit breaker and provide a current path. The load current of the switch cabinet needs to flow through the plum blossom contact. One end of the plum blossom contact is connected to the moving contact arm, and the other end is connected to the static contact arm. Due to the existence of contact resistance, under the action of large load current, local heating is formed at the connection between the plum blossom contact and the moving and static contact arms, resulting in the temperature of the plum blossom contact being significantly higher than that of other components in the switch cabinet. The plum blossom contact is the component with the highest temperature in the switch cabinet and is the main object of temperature monitoring of the switch cabinet.

[0003] The temperature monitoring of the plum blossom contact has always been the core work of the switch cabinet temperature monitoring. Currently, for the existing plum blossom contact monitoring on the market, whether it is the clip-spring type installation or the bundling type installation, ultimately the temperature sensor is installed on the outer periphery of the ring of the plum blossom contact. After installation, the temperature sensor will exceed the original contour of the plum blossom contact. For example, CN207719057U, CN 220454719 U, CN 213067724 U, etc. The consequence of this is that the insulation distance between the plum blossom contact and the contact insulation sheath is shortened, and the insulation performance deteriorates, bringing huge potential safety hazards to the equipment. Content of the Utility Model

[0004] The purpose of the utility model is to provide a finger-contact spring-type temperature sensor to overcome the deficiencies of the prior art. After installation, it does not exceed the original contour of the plum blossom contact and does not reduce the insulation performance of the equipment.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a finger-contact spring-type temperature sensor, which includes a sensor base and a sensor body;

[0006] The sensor base is in a "C" shape and is elastic, including a top platform and connecting parts respectively arranged on both sides of the top platform; two positioning edges for clamping on the finger contacts are arranged at the bottom of the top platform; a bevel edge is arranged at the connection end of each connecting part and the top platform, and a barb edge for hooking the bottom of the adjacent finger contact is arranged at the other end;

[0007] The sensor body is located on the top platform and adopts a passive working mode, including an antenna and a temperature sensor chip arranged on the antenna; the size of the antenna is not higher than the maximum contour size of the plum blossom contact.

[0008] Preferably, the two positioning edges are formed by cutting and bending, and the distance between the two positioning edges is slightly smaller than the thickness of the finger contact.

[0009] Preferably, the two positioning edges are fixed to the bottom of the top platform by welding, and the distance between the two positioning edges is slightly smaller than the thickness of the contact finger.

[0010] Preferably, the connecting parts on both sides of the top platform are symmetrically S-shaped, with the upper part being convex and the lower part being concave.

[0011] Preferably, the sensor base is made of metal material.

[0012] Preferably, the temperature sensor chip can be welded on any side of the length, width and height of the antenna.

[0013] Preferably, the antenna is a printed wire antenna, and the antenna substrate is made of a plate material with a high dielectric constant and low loss.

[0014] Preferably, it also includes a sensor housing; the sensor body is located in the sensor housing; the sensor housing is made of non-metallic material, and is made of a material with high stability, good insulation and strong heat resistance.

[0015] Preferably, a receiving cavity corresponding to the shape of the sensor body is processed inside the sensor housing.

[0016] Preferably, the sensor housing is encapsulated in a colloid to encapsulate the sensor body.

[0017] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0018] The utility model has not only a simple and compact structure, but also convenient and reliable installation. Moreover, after the temperature sensor is installed, it does not exceed the original outline of the plum blossom contact, does not reduce the insulation performance of the equipment, and makes the equipment safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0020] Attached Figure 1 This is a working schematic diagram of the contact spring type temperature sensor of the utility model;

[0021] Attached Figure 2 This is a working explosion diagram of the contact spring type temperature sensor of the utility model;

[0022] Attached Figure 3 This is a schematic diagram of the structure of a sensor base in the utility model;

[0023] Attached Figure 4 It is a structural schematic diagram of another sensor base in the utility model;

[0024] Attached Figure 5This is a schematic structural view of the temperature sensor chip welded in the length direction of the antenna in the present utility model;

[0025] Appendix Figure 6 This is a schematic structural view of the temperature sensor chip welded in the height direction of the antenna in the present utility model;

[0026] Appendix Figure 7 This is a schematic structural view of the temperature sensor chip welded in the width direction of the antenna in the present utility model;

[0027] Appendix Figure 8 This is a schematic installation view of the sensor base in the present utility model.

[0028] Wherein: 1. Temperature sensor; 11. Sensor base; 111. Top platform; 112. Connecting part; 113. Positioning edge; 114. Inclined edge; 115. Hooked edge; 12. Sensor body; 121. Antenna; 122. Temperature sensor chip; 13. Sensor housing; 2. Plum blossom contact; 21. Central contact finger; 22. Left adjacent contact finger; 23. Right adjacent contact finger. Detailed implementation mode

[0029] The following further elaborates on the present utility model in conjunction with the attached drawings and specific embodiments.

[0030] Appendix Figure 1-8 The finger contact spring type temperature sensor described in the present utility model includes a sensor base 11, a sensor body 12, and a sensor housing 13;

[0031] The sensor base 11 is in a "Ji" shape and has elasticity, including a top platform 111 and connecting parts 112 respectively arranged on both sides of the top platform 111; two positioning edges 113 for clamping on the contact fingers are arranged at the bottom of the top platform 111; an inclined edge 114 is arranged at the connection end of each connecting part 112 and the top platform 111, and a hooked edge 115 for hooking the bottom of the adjacent contact finger is arranged at the other end;

[0032] The sensor body 12 is located on the top platform 111 and includes an antenna 121 and a temperature sensor chip 122 arranged on the antenna 121;

[0033] The sensor housing 13 is used to accommodate the sensor body 12 and plays a protective role.

[0034] Furthermore, the sensor base 11 is made of a metal material, preferably silver-plated copper.

[0035] Furthermore, the top platform 111 is square;

[0036] The length of the top platform 111 is slightly less than the maximum length of the concave space of the plum blossom contact finger, preferably 20 mm;

[0037] The width of the top platform 111 is greater than the width of the temperature sensor 1 and less than the horizontal distance between the two groups of plum blossom contact fingers; it can be freely changed within a relatively large range, preferably 15 mm.

[0038] Furthermore, the positioning edge 113 has the function of being clamped on the contact finger to ensure that after installation, the platform installed on the top of the contact finger will not shake left and right.

[0039] Further, there are two methods for positioning the edge 113. One method is as follows: Figure 3 As shown, the platform is cut directly in the middle, and the two positioning edges 113 are formed after the central cut. Figure 4 As shown, two metal strips are welded at the bottom of the platform to form a positioning edge 113;

[0040] Furthermore, the length of the positioning edge 113 of the cutting and bending method protruding downward is 2 to 3 mm, preferably 2.5 mm; the width of the positioning edge 113 of the cutting and bending method is 2 to 3 mm, preferably 2.5 mm; that is, the degree of firmness of the installation can be ensured, and at the same time, the size of the hollow part of the top platform 111 can be ensured to be less than 50% of the size of the sensor body 12;

[0041] Furthermore, the size of the positioning edge 113 of the welding method is as large as possible under the premise of ensuring that no interference occurs during installation. Its functions are to increase the firmness of the installation and to increase the contact area with the contact finger, thereby increasing the speed of heat conduction between the sensor base 11 and the contact finger.

[0042] The width of the positioning edge 113 of the welding method is 2 to 18 mm, preferably 15 mm;

[0043] The length of the positioning edge 113 of the welding method is 2 to 7 mm, preferably 5.5 mm;

[0044] The positioning edge 113 processed by welding is more solid and has a larger heat conduction area, but the cost is also higher.

[0045] Furthermore, the distance between the two positioning edges 113 is slightly smaller than the thickness of the contact finger, and is clamped on the contact finger during installation, and the elasticity of the metal copper material is used to ensure that the two are closely fitted, and the top platform 111 will not shake after installation.

[0046] Furthermore, the two positioning edges 113 are closely fitted to the contact fingers and simultaneously play a role of heat conduction, thereby accelerating the heat conduction between the contact fingers and the sensor base 11 .

[0047] Furthermore, the bevel 114 connected to the top platform 111 is used to lower the height of other components outside the top platform 111 to prevent the mounting base of the temperature sensor 1 from exceeding the original outer edge contour of the plum blossom contact 2 .

[0048] Furthermore, the inclination angle of the oblique edge 114 is the inclination angle of the connecting line between the edge of the top platform 111 and the edge of the adjacent plum blossom contact finger.

[0049] Furthermore, the connecting parts 112 on both sides of the top platform 111 are symmetrically S-shaped, with the upper part convex and the lower part concave, so as to allow the metal plate to bend inward to fit the contact finger, increase the angle of the hook edge 115, and thus increase the buckle force.

[0050] Furthermore, the height from the end of the connecting portion 112 to the top platform 111 matches the height of the plum blossom contact finger, and after installation, it is ensured that the end of the transition edge is flush with the end of the plum blossom contact finger.

[0051] Furthermore, the barbed edge 115 is like the barb of a fishhook, and after installation, it hooks the bottom of the adjacent plum blossom contact finger to ensure that the temperature sensor 1 will not loosen or fall off after installation.

[0052] Furthermore, the width of the barbed edge 115 is as wide as possible, preferably 8 mm, on the premise that it does not interfere with the oblique convex part of the bottom of the plum blossom contact finger during installation.

[0053] Furthermore, the length of the barbed edge 115 is as long as possible, preferably 3 mm, while ensuring that it does not exceed the width of the plum blossom contact finger after installation.

[0054] Furthermore, the temperature sensor chip 122 adopts a passive working mode and can work without battery power or power supply, such as a temperature sensor based on SAW or RFID technology.

[0055] Further, if Figure 5-7 As shown, the temperature sensor chip 122 can be welded to any side of the length, width, and height of the antenna 121 , and the welding position depends on the design of the antenna 121 .

[0056] Furthermore, the sensor housing 13 is made of non-metallic material, and is made of a material with high stability, good insulation and strong heat resistance, preferably PPS.

[0057] Furthermore, the sensor housing 13 can be processed into a square shape to match the size of the antenna 121, or the temperature sensor chip 122 and the antenna 121 can be encapsulated in a colloid.

[0058] Furthermore, if the encapsulation method is adopted, the material of the glue used must be able to withstand the temperature for a long time and needs to cover the temperature measurement range of the temperature sensor, which is usually -25℃~125℃, or -40℃~125℃; at the same time, the colloid needs to be insulating and flame retardant.

[0059] Furthermore, the antenna 121 is a printed wire antenna, and the antenna substrate is made of a plate with a high dielectric constant and low loss, preferably a ceramic substrate.

[0060] Furthermore, the size of the antenna 121 is not greater than the maximum outer size of the plum blossom contact 2, preferably 19*12*3mm;

[0061] When installing: Figure 8 As shown, a set of plum blossom contact fingers is selected as the central contact finger 21, and the contact fingers adjacent to it are the left contact finger 22 and the right contact finger 23, and the sensor is inserted from top to bottom;

[0062] The positioning edge 113 is clamped on both sides of the central contact finger 21 and fits tightly with the side of the central contact finger 21 to ensure that the sensor does not shake;

[0063] The connecting portion 112 is inserted from the hollowed-out portion between the left adjacent contact finger 22, the right adjacent contact finger 23 and the central contact finger 21 respectively;

[0064] When the sensor is inserted into place, the barbed edge 115 will hook the bottom of the left adjacent contact finger 22 and the right adjacent contact finger 23 respectively to ensure that the sensor does not fall off.

[0065] The temperature sensor 1 of the present invention is engaged with the top of the central contact finger 21 by the positioning edge 113, and the two side hook edges 115 are respectively fitted with the bottom of the left adjacent contact finger 22 and the right adjacent contact finger 23 to form a stable triangular fixation, thereby ensuring the installation reliability of the sensor.

[0066] 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 finger-type spring-type temperature sensor, characterized in that: It includes a sensor base and a sensor body; The sensor base is in a "ji" shape and is elastic, including a top platform and connecting parts respectively arranged on both sides of the top platform; two positioning edges for clamping on the contact fingers are arranged at the bottom of the top platform; a bevel edge is arranged at the connecting end of each connecting part and the top platform, and a barb edge for hooking the bottom of the adjacent contact finger is arranged at the other end; The sensor body is located on the top platform and operates in a passive mode, including an antenna and a temperature sensor chip arranged on the antenna; the size of the antenna is not higher than the maximum external dimension of the plum blossom contact.

2. The finger-type spring-type temperature sensor according to claim 1, characterized in that: The two positioning edges are formed by cutting and bending, and the distance between the two positioning edges is smaller than the thickness of the contact finger.

3. The finger-type spring-type temperature sensor according to claim 1, characterized in that: The two positioning edges are fixed to the bottom of the top platform by welding, and the distance between the two positioning edges is smaller than the thickness of the contact finger.

4. The finger-type spring-type temperature sensor according to any one of claims 1 to 3, characterized in that: The connecting parts on both sides of the top platform are in a symmetric S shape, with the upper part protruding outward and the lower part concave inward.

5. The finger-type spring-type temperature sensor according to claim 4, characterized in that: The sensor base is made of a metal material.

6. The finger-type spring-type temperature sensor according to claim 1, characterized in that: The temperature sensor chip is welded on any one of the length, width and height of the antenna.

7. The finger-type spring-type temperature sensor according to claim 6, characterized in that: The antenna is a printed wire antenna, and the antenna substrate is made of a plate with a high dielectric constant and low loss.

8. The finger-type spring-type temperature sensor according to claim 1, characterized in that: It further includes a sensor housing; the sensor body is located inside the sensor housing; the sensor housing is made of a non-metal material.

9. The finger-type spring-type temperature sensor according to claim 8, characterized in that: A receiving cavity corresponding to the shape of the sensor body is machined inside the sensor housing.

10. The finger-type spring-type temperature sensor according to claim 8, characterized in that: The sensor housing adopts a potting method to pot the sensor body in the colloid.

Images