Contact finger with base for tulip contact, tulip contact and system

Abstract

The contact finger comprises a contact finger body and the base which is arranged on the side face of the contact finger body and used for installing a temperature sensor, and the height difference between the face, used for installing the temperature sensor, of the base and the outer edge is larger than or equal to the height of the temperature sensor. The invention further discloses a tulip contact which comprises a support, a plurality of contact fingers evenly arranged in the circumferential direction of the support and springs arranged at the two ends of the contact fingers in a sleeving mode, gaps are formed between the adjacent contact fingers, the contact fingers comprise at least one contact finger with a base, and the temperature sensors are arranged on the base and located in the gaps between the contact fingers where the temperature sensors are located and the adjacent contact fingers. The invention further discloses a system using the tulip contact. The temperature sensor can be installed by effectively utilizing the space between the contact fingers of the tulip contact, and it is ensured that the installed temperature sensor does not exceed the original contour of the tulip contact.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid equipment, and more specifically to a contact finger with a base for a plum blossom contact, a plum blossom contact with a temperature measurement function using the contact finger, and a system using the plum blossom contact. Background Art

[0002] The function of the plum blossom contact is to realize electrical connection between the moving and static contact arms of the switch cabinet circuit breaker and provide a current path. Usually, they are divided into different specifications according to the current they carry, such as 630A (12 pieces) plum blossom contacts, 125A (30 pieces) plum blossom contacts, 1600A (36 pieces) plum blossom contacts, 2000A (48 pieces) plum blossom contacts, 4000A (84 pieces) plum blossom contacts, etc.

[0003] The current carried by the plum blossom contact is very large, and due to the existence of contact resistance, the plum blossom contact is the most seriously heated part inside the switch cabinet, and is also the part most likely to have local overheating, leading to equipment failure or even serious safety accidents. Therefore, real-time temperature monitoring of the plum blossom contact has always been the focus of switch cabinet temperature monitoring.

[0004] The existing plum blossom contacts with temperature measurement function are actually temperature sensors installed on the plum blossom contacts. The technical principles adopted by this type of temperature sensor are generally wireless, such as CT power supply, RFID, surface acoustic wave, etc. The installation method adopted by these temperature sensors is usually bundling or snap-on. There is a problem with the existing plum blossom contacts with temperature measurement function, that is, after the temperature sensor is installed, the height of the temperature sensor will exceed the original maximum size of the plum blossom contact. The consequence of this practice is that the safety distance between the plum blossom contact and the insulating sheath is shortened, disrupting the original electric field distribution, reducing the insulation performance of the equipment, and bringing huge safety hazards to the switch cabinet.

[0005] The existing structure of the plum blossom contact is that a certain number of contact fingers are clamped on the bracket by two springs to form a hollow cylinder. The plum blossom contact is usually installed on the moving contact arm and can be pushed out with the trolley. When the trolley is pushed to the working position, the static contact arm is inserted into the contact finger of the plum blossom contact, forming an electrical connection with the moving contact arm to realize the transmission of current. In the structure of the entire plum blossom contact, the outermost layer is the spring used for fastening. The diameter of the spring is generally 4mm. That is to say, if a temperature sensor is installed on the outer edge of the plum blossom contact, in order not to reduce the original insulation performance after the temperature sensor is installed, the maximum installation height of the temperature sensor cannot exceed 4mm. However, the existing method of installing the temperature sensor will cause the height of the temperature sensor to exceed the original maximum size of the plum blossom contact and the diameter of the spring after installation. The details are as follows:

[0006] (1) Temperature sensor based on CT power supply: The outer contour of the plum blossom contact is circular, and the current flows on the surface of the contact fingers that make up the contact (skin effect). Therefore, for temperature sensors that use the CT power supply principle, they must be bundled on the outside of the plum blossom contact to form a power supply ring. This method will inevitably cause the installed sensor to exceed the original contour of the plum blossom contact, resulting in a decrease in insulation performance;

[0007] (2) Temperature sensors based on RFID or surface acoustic wave principles are usually square. This shape of temperature sensor is installed on the outer diameter of the plum blossom contact, which will inevitably cause the temperature sensor to exceed the original shape of the plum blossom contact after installation, reducing the insulation performance of the switch cabinet. If the RFID or surface acoustic wave temperature sensor is made into an arc and clamped on the outer diameter of the plum blossom contact, this method can reduce the height of the sensor after installation, but the problem brought by this method is that the antenna of the sensor is a heterosexual antenna, which greatly increases the cost; the second problem is that the space that can be used by this method is only 4mm high for the tightening spring. The space is too small, resulting in a decrease in the performance of the sensor antenna, insufficient stability in temperature data transmission, and a significant increase in the false alarm rate, making the monitored temperature data unreliable. Therefore, this method cannot be applied in practice. Summary of the invention

[0008] The existing plum blossom contact with temperature measurement function installs the temperature sensor on the outer edge of the plum blossom contact. The temperature sensor exceeds the original outline of the plum blossom contact, shortens the safety distance between the plum blossom contact and the insulating sheath, and reduces the insulation performance of the equipment. The biggest reason for this result is that in order not to shorten the insulation distance between the plum blossom contact and the insulating sheath, the available height of the outer edge of the plum blossom contact is only the size of the spring diameter, but the size of the existing temperature sensor is far greater than this size, so it is necessary to use the other space of the plum blossom contact.

[0009] In order to solve this problem, the present invention proposes a contact finger with a base for a plum blossom contact, comprising: a contact finger body and a base, the base being arranged on the side of the contact finger body, the base being used to install a temperature sensor, and the height difference between the surface of the base for installing the temperature sensor and the outer edge of the contact finger body being at least greater than or equal to the height of the temperature sensor to be installed.

[0010] Furthermore, the base and the stylus body are integrally formed.

[0011] Furthermore, the base is fixedly connected to the contact body.

[0012] Furthermore, the base is in a trapezoidal shape.

[0013] Furthermore, the contact finger body is made of copper plated with silver.

[0014] The present invention provides a plum blossom contact, comprising a bracket, a spring, a temperature sensor and a plurality of contact fingers, wherein the plurality of contact fingers are evenly arranged along the circumference of the bracket, and the outer edge of each of the plurality of contact fingers forms the outer circumferential contour of the plum blossom contact; a gap is provided between any one of the plurality of contact fingers and an adjacent contact finger; the spring is sleeved on both ends of the plurality of contact fingers; wherein the plurality of contact fingers include at least one contact finger with a base as described above, and the base is located in the gap between the contact finger with the base and the adjacent contact finger; and the temperature sensor is arranged on the base.

[0015] Furthermore, the temperature sensor is fixed on the surface of the base that is closest to the outer edge.

[0016] Furthermore, it also includes a sensor housing, wherein the sensor housing is covered outside the temperature sensor.

[0017] Furthermore, the sensor housing is provided with a first mounting hole, the base is provided with a second mounting hole corresponding to the first mounting hole, and a fastener passes through the first mounting hole and the second mounting hole in sequence.

[0018] Furthermore, the height of the surface on the base for mounting the temperature sensor from the outer edge is greater than or equal to the height of the temperature sensor and the wall thickness of the sensor housing.

[0019] Furthermore, the sensor housing is made of insulating, high temperature resistant, and low dielectric constant material.

[0020] Furthermore, the sensor housing is made of PPS.

[0021] Furthermore, the temperature sensor communicates with the outside world wirelessly.

[0022] Furthermore, the temperature sensor includes an antenna and a chip, the antenna is arranged on the base, and the chip is arranged on the antenna.

[0023] Furthermore, the chip is arranged in any direction of the length, width and height of the antenna.

[0024] Furthermore, the base and the contact finger with the base are integrally formed.

[0025] Furthermore, the base is fixedly connected to the contact finger with the base.

[0026] Furthermore, the base is in a trapezoidal shape.

[0027] Furthermore, the contact fingers are made of copper plated with silver.

[0028] The present invention also provides a plum blossom contact system, comprising the plum blossom contact as described above. The plum blossom contact system is preferably a switch cabinet, a circuit breaker, a moving contact, etc.

[0029] The present invention has the following technical effects: the present invention replaces at least one contact finger of the plum blossom contact with a contact finger with a base provided by the present invention instead of a conventional contact finger, so that the temperature sensor can be installed in the gap between the contact fingers of the plum blossom contact, fully utilizing the original space of the plum blossom contact, reducing the height of the temperature sensor after installation, ensuring that the temperature sensor does not exceed the original outline of the plum blossom contact after installation, and facilitating the insulation performance of the plum blossom contact; in addition, by using a temperature sensor with an antenna, real-time online temperature monitoring of the plum blossom contact is realized without reducing the original insulation performance of the equipment.

[0030] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of a conventional plum blossom contact in the prior art;

[0032] Figure 2 It is a structural schematic diagram of a contact finger with a base according to a preferred embodiment of the present invention;

[0033] Figure 3 yes Figure 2 A schematic diagram of the structure of the stylus body in FIG.

[0034] Figure 4 yes Figure 2 An exploded schematic diagram of a finger-mounted temperature sensor in FIG. 1 , wherein the temperature sensor chip is mounted in the length direction of the antenna;

[0035] Figure 5 The temperature sensor chip is shown mounted in the width direction of the antenna;

[0036] Figure 6 The temperature sensor chip is shown mounted in the height direction of the antenna;

[0037] Figure 7 It is a schematic diagram of the structure of a plum blossom contact with a temperature measurement function according to a preferred embodiment of the present invention, without showing a temperature sensor;

[0038] Figure 8 yes Figure 7 Schematic diagram of the structure after the temperature sensor is installed;

[0039] Fig. 9 yes Figure 8 Schematic diagram of the structure from another perspective, without the outer shell.

[0040] Among them, 1-touch finger, 2-spring, 3-bracket,

[0041] 10-contact finger with base, 20-contact finger body, 21-side, 22-outer edge, 30-base, 31-top surface, 32-second mounting hole, 40-temperature sensor, 41-antenna, 42-chip, 50-housing, 51-first mounting hole,

[0042] 100-Plum blossom contact with temperature measurement function. DETAILED DESCRIPTION

[0043] The following describes several preferred embodiments of the present invention with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0044] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0045] The plum blossom contact is an electrical connector contact with a plum blossom-shaped diameter. Its main function is electrical connection, especially in the power system for the transmission of primary power. The plum blossom contact is mainly composed of a contact finger, a fixed bracket, and a fixed spring. Figure 1 The existing plum blossom contact is shown, comprising a plurality of contact fingers 1, a spring 2 and a bracket 3. The main body of the bracket 3 is annular, and a plurality of contact fingers 1 are evenly distributed around the circumference of the bracket. The outer edges of the contact fingers 1 form the original outline of the plum blossom contact, which is generally cylindrical, and the outer edges of the contact fingers 1 are on the outer circumferential surface of the cylinder. The number of contact fingers is determined by the size of the load current, and is generally divided into 12 pieces (rated load 630A), 30 pieces (rated load 1250A), 36 pieces (rated load 1600A), 48 pieces (rated load 2000A), and 84 pieces (rated load 4000A). Springs 2 are respectively arranged on the periphery of both ends of the contact fingers 1, so as to tightly clamp the contact fingers 1 on the bracket 3. Figure 1 The plum blossom contact shown is a well-known structure. It should be understood that the plum blossom contact applicable to the present invention is not limited to Figure 1 The structure shown and other known plum blossom contacts can all be applied to the technical solution of the present invention.

[0046] The existing plum blossom contact with temperature measurement function installs the temperature sensor on the outer circumference of the plum blossom contact. The temperature sensor exceeds the original outline of the plum blossom contact (i.e., protrudes radially outward from the outer circumference of the plum blossom contact), shortening the safety distance between the plum blossom contact and the insulating sheath, and reducing the insulation performance of the equipment. The biggest reason for this result is that in order not to shorten the insulation distance between the plum blossom contact and the insulating sheath, the available height of the outer edge of the plum blossom contact is only the diameter of the spring. For example, when the diameter of the spring is 4mm, the available height of the outer edge of the plum blossom contact is only 4mm. However, the size of the existing temperature sensor is far beyond this size. The thickness of the conventional temperature sensor is 4mm or 5mm. With the shell and the fixed base, this height exceeds the maximum available height of the outer edge of the plum blossom contact by 4mm. To solve this problem, without additionally designing a matching temperature sensor, to use the existing conventional temperature sensor, it is necessary to find a way to use the other space of the plum blossom contact.

[0047] The inventor analyzed the structure of the plum blossom contact and found that the space between the contact fingers of the plum blossom contact can be used to install a temperature sensor. Figure 1 , the plum blossom contact with a rated load power of 630A, the spacing between two adjacent groups (a total of 12 pieces, each 2 pieces in one group) of contact fingers is 11mm, the length of the finger gap is 20mm, and the length of the conventional temperature sensor is 13mm, and the width is 9mm, which is enough to install the temperature sensor. This requires the temperature sensor to be installed downward, and downward here refers to the radial inward direction from the outer surface of the circumferential contour of the plum blossom contact. In other words, the temperature sensor is installed in the gap between the two contact fingers. Since there is no supporting structure for installing the temperature sensor between the contact fingers, based on this, the present invention provides a contact finger of a plum blossom contact.

[0048] like Figure 2 As shown in FIG. 1 , the contact finger 10 for the plum blossom contact provided by the present invention comprises a contact finger body 20 and a base 30 disposed on the contact finger body 20. The structure of the contact finger body 20 may be a contact finger structure of a plum blossom contact existing in the prior art, and its specific structure does not constitute a limitation to the present invention. The base 30 is disposed on the side 21 of the contact finger body 20, see FIG. Figure 3 The side surface 21 is the side surface facing the adjacent contact finger when the contact finger body 20 is installed on the plum blossom contact.

[0049] The base 30 is disposed on the side surface 21 of the contact body 20, and the height of the top surface 30 of the base 30 from the outer edge 22 of the contact body 20 is greater than or equal to the height of the temperature sensor 40 installed on the base 30. This can prevent the temperature sensor 40 from being greater than the outer circumference of the plum blossom contact after it is installed. The outer edge 22 of the contact body 20 here refers to the outer circumference of the plum blossom contact formed after the contact body 20 is installed on the bracket to form the plum blossom contact. Figure 4 As shown, the top surface 30 of the base 30 can be used to install the temperature sensor 40. The top surface 30 here is the surface of the base 30 closest to the outer edge 22 of the contact body 20. When the contact finger 10 is installed on the plum blossom contact, the top surface 30 of the base 30 faces the outer circumference of the plum blossom contact.

[0050] In some embodiments, the base 30 and the stylus body 20 are integrally formed, that is, the base 30 and the stylus body 20 are an inseparable whole.

[0051] In some embodiments, the base 30 is a separate component, and is fixed to the stylus body 20 by welding, bonding, or fastener connection.

[0052] In some embodiments, the base 30 may be in a trapezoidal shape. The contact fingers on the plum blossom contact are distributed along the circumferential direction, and the gap distance between adjacent contact fingers decreases along the radial direction. The base 30 is in a trapezoidal shape, which can better ensure that the base 30 will not interfere with adjacent contact fingers.

[0053] The material of the contact body 20 can be the same as that of the contact in the prior art. The specific material does not constitute a limitation to the present invention. Preferably, the material of the contact body 20 is copper plated with silver.

[0054] In some embodiments, the temperature sensor 40 is fixedly connected to the top surface of the base 30. For example, the temperature sensor 40 can be fixed to the top surface of the base 30 by bonding, welding or fastener connection.

[0055] In some embodiments, a sensor housing 50 is further disposed outside the temperature sensor 40. In this case, the height of the top surface 30 of the base 30 from the outer edge 22 of the stylus body 20 is greater than or equal to the height of the temperature sensor 40 plus the wall thickness of the sensor housing 50. In this case, the temperature sensor 40 can also be fixed by fixing the sensor housing 50 on the base 30. For example, Figure 4 As shown, the temperature sensor 40 is arranged on the top surface 30 of the base 30, the shape of the sensor housing 50 matches the shape of the temperature sensor 40, and covers the outside of the temperature sensor 40, the sensor housing 50 is provided with a first mounting hole 51, and the top surface of the base 30 is provided with a corresponding second mounting hole 32, and the fastener passes through the two holes in sequence, so as to install the sensor housing 50 on the base 30. The sensor housing 50 can be made of insulating, high temperature resistant, and low dielectric constant materials, such as PPS material.

[0056] The temperature sensor 40 is preferably a wireless transmission sensor, including a sensor antenna 41 and a sensor chip 42, wherein the chip 42 is connected to the sensor antenna 41. Figure 4 , Figure 5 and Figure 6 As shown, the chip 42 can be located in any direction of the length, width, and height of the sensor antenna 41. The sensor antenna 41 can communicate with an external control device by wireless communication. The sensor antenna 41 can be located on the top surface or the bottom surface of the temperature sensor 40, the bottom surface refers to the surface where the temperature sensor 40 contacts the base 30, and the top surface is the surface opposite to the bottom surface. The temperature sensor 40 can select an existing sensor in the prior art without additional design, thereby reducing the cost of the plum blossom contact.

[0057] like Figure 7 , Figure 8 and Fig. 9 As shown, the present invention further provides a plum blossom contact 100 with a temperature measurement function using the above-mentioned contact finger. The plum blossom contact 100 includes a plurality of contact fingers 1, and the plurality of contact fingers 1 are evenly arranged along the circumference of the plum blossom contact, and gaps 101 are formed between adjacent contact fingers 1. Among them, one contact finger uses the contact finger 10 with a base 30 provided by the present invention, and the remaining contact fingers 1 can use conventional contact fingers in the prior art, and the base 30 is located in the gap 101 between the contact finger 10 and the adjacent contact finger 1. A temperature sensor 40 is installed on the contact finger 10 with a base 30. Using the plum blossom contact 100 with a temperature measurement function provided by the present invention, as Figure 8 As shown, after the temperature sensor 40 is installed, any part of the temperature sensor 40 will not exceed the original outline of the plum blossom contact 100, thereby not affecting the safety distance between the plum blossom contact 100 and the insulating sheath, not reducing the insulation performance of the equipment, and realizing online temperature monitoring of the plum blossom contact 100.

[0058] The present invention further provides a plum blossom contact system, comprising the above-mentioned plum blossom contact 100. The plum blossom contact system described in the present invention refers to equipment that needs to use plum blossom contacts, such as moving contacts, circuit breakers, switch cabinets and other equipment.

[0059] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in the field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A contact finger with a base for a plum blossom contact, characterized in that: The device comprises a stylus body and a base, wherein the base is arranged on the side of the stylus body and is used to install a temperature sensor. The height difference between the surface of the base for installing the temperature sensor and the outer edge of the stylus body is at least greater than or equal to the height of the temperature sensor to be installed.

2. The stylus according to claim 1, characterized in that: The base and the contact finger body are integrally formed.

3. The stylus according to claim 1, characterized in that: The base is fixedly connected to the contact body.

4. The stylus according to claim 1, characterized in that: The base is in a trapezoidal shape.

5. The stylus according to claim 1, characterized in that: The contact finger body is made of copper plated with silver.

6. A plum blossom contact, characterized in that: It comprises a bracket, a spring, a temperature sensor and a plurality of contact fingers, wherein the plurality of contact fingers are evenly arranged along the circumference of the bracket, and the outer edge of each of the plurality of contact fingers forms the outer circumferential contour of the plum blossom contact; there is a gap between any one of the plurality of contact fingers and an adjacent contact finger; the spring is sleeved on both ends of the plurality of contact fingers; wherein the plurality of contact fingers comprise at least one contact finger with a base as claimed in claim 1, and the base is located in the gap between the contact finger with the base and the adjacent contact finger; and the temperature sensor is arranged on the base.

7. The plum blossom contact according to claim 5, characterized in that: The temperature sensor is fixed on the surface of the base closest to the outer edge.

8. The plum blossom contact according to claim 7, characterized in that: It also includes a sensor housing, which is covered outside the temperature sensor.

9. The plum blossom contact according to claim 8, characterized in that: The sensor housing is provided with a first mounting hole, the base is provided with a second mounting hole corresponding to the first mounting hole, and a fastener passes through the first mounting hole and the second mounting hole in sequence.

10. The plum blossom contact according to claim 9, characterized in that: The height of the surface on the base for mounting the temperature sensor from the outer edge is greater than or equal to the height of the temperature sensor and the wall thickness of the sensor housing.

11. The plum blossom contact according to claim 8, characterized in that: The sensor housing is made of insulating, high temperature resistant and low dielectric constant material.

12. The plum blossom contact according to claim 11, characterized in that: The sensor housing is made of PPS.

13. The plum blossom contact according to claim 6, characterized in that: The temperature sensor communicates with the outside world wirelessly.

14. The plum blossom contact according to claim 13, characterized in that: The temperature sensor comprises an antenna and a chip. The antenna is arranged on the base, and the chip is arranged on the antenna.

15. The plum blossom contact according to claim 14, characterized in that: The chip is arranged in any direction of the length, width and height of the antenna.

16. The plum blossom contact according to claim 6, characterized in that: The base and the contact finger with the base are integrally formed.

17. The plum blossom contact according to claim 6, characterized in that: The base is fixedly connected to the contact finger with base.

18. The plum blossom contact according to claim 6, characterized in that: The base is in a trapezoidal shape.

19. The plum blossom contact according to claim 6, characterized in that: The contact fingers are made of copper plated with silver.

20. A plum blossom contact system, characterized in that: It comprises the plum blossom contact as described in any one of claims 6-19.

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