Carbon composite energy absorbing resistor

Abstract

The application relates to the technical field of circuit elements, in particular to a carbon composite energy-absorbing resistor which comprises connecting cores, resistor sheets, aluminum foil sheets, copper bars and fixing nuts, the number of the resistor sheets and the number of the aluminum foil sheets are both multiple, the multiple resistor sheets and the multiple aluminum foil sheets are all divided into four groups, the four groups of resistor sheets are sequentially arranged, the axes of each group of resistor sheets coincide with each other, one aluminum foil sheet is arranged between each group of adjacent resistor sheets, the axes of each group of aluminum foil sheets coincide with the axes of the corresponding group of resistor sheets, the four groups of resistor sheets are sequentially arranged, the number of the connecting cores is four, the four connecting cores respectively pass through the four groups of resistor sheets, the number of the copper bars is two, the two ends of the connecting cores pass through the two copper bars, and the fixing nuts are threadedly connected to the two ends of the connecting cores. The application has the effect that users can conveniently adjust the resistance value of the resistor.

Description

Technical Field

[0001] This application relates to the technical field of circuit elements, and in particular to a carbon composite energy-absorbing resistor. Background Technology

[0002] A resistor is a current-limiting element. When a resistor is connected in a circuit, its resistance value is fixed. It usually has two leads and can limit the amount of current passing through the branch it is connected to.

[0003] The resistance value of the resistors used in circuit breakers is fixed. The resistors are cylindrical, one-piece molded resistors. Multiple resistors are connected to copper busbars to form a parallel resistor. If you want to select a resistor with a different resistance value according to your needs, you need to remanufacture the resistors and assemble them, which consumes a lot of manpower and resources. Utility Model Content

[0004] To facilitate user adjustment of resistor values, this application provides a carbon composite energy-absorbing resistor.

[0005] This application provides a carbon composite energy-absorbing resistor, which adopts the following technical solution:

[0006] A carbon composite energy-absorbing resistor includes connecting cores, resistive sheets, aluminum foil sheets, copper busbars, and fixing nuts. The resistive sheets and aluminum foil sheets are in multiples, each divided into four groups. The four groups of resistive sheets are arranged sequentially, with the axes of each group coinciding. An aluminum foil sheet is sandwiched between adjacent resistive sheets in each group, and the axis of each aluminum foil sheet coincides with the axis of the corresponding group of resistive sheets. The four groups of resistive sheets are arranged sequentially. There are four connecting cores, each passing through one of the four groups of resistive sheets. There are two copper busbars, with both ends of each connecting core passing through them. The fixing nuts are threaded to both ends of the connecting cores.

[0007] By adopting the above technical solution, when the user needs to adjust the resistance value of the resistor, the fixing nut is removed from both ends of the connecting core, the copper busbar is released from the constraint of each group of resistors, and the number of each group of resistors is increased or decreased according to the user's needs, thereby achieving the purpose of changing the resistance value of the resistor. The user does not need to re-fire the resistor, which makes it convenient for the user to adjust the resistance value of the resistor.

[0008] Optionally, the two ends of the connecting core are set as electrodes, and the connecting core portion between the two electrodes is made of glass fiber.

[0009] By adopting the above technical solution, the electrodes can achieve the purpose of conducting electricity, and the glass fiber is an insulator, which realizes the purpose of four sets of resistors being connected in parallel and resistors in the same set being connected in series, thus realizing the basic function of the resistor.

[0010] Optionally, the outer surface of the electrode is provided with external threads, and the fixing nut is threadedly connected to the outside of the electrode.

[0011] By adopting the above technical solution, the fixed connection between the fixing nut and the connecting core is achieved, while the resistor is confined between the two copper busbars.

[0012] Optionally, both the center of the resistor sheet and the center of the aluminum foil sheet are provided with a connecting hole, and the connecting core passes through the connecting hole and is threaded to the fixing nut.

[0013] By adopting the above technical solution, the purpose of the connecting core passing through the resistor sheet and the aluminum foil sheet is achieved, thus realizing the connection between the resistor sheet and the aluminum foil sheet.

[0014] Optionally, the resistor is made of carbon composite ceramic material.

[0015] By adopting the above technical solution, the performance of this application is improved, enabling it to absorb high pulse energy and making it suitable for harsh working environments such as strong pulse overload.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. This application uses a connecting core to fix multiple resistors in series, allowing users to adjust the number of resistors in series as needed, thereby adjusting the resistance value of the resistor. This eliminates the need for users to invest manpower and resources in producing new resistors, making it convenient for users to adjust the resistance value of the resistor.

[0018] 2. The resistor is made of carbon composite ceramic material, which enables this application to absorb high pulse energy and is suitable for harsh working conditions such as strong pulse overload. Attached Figure Description

[0019] Figure 1 This is a front view of a carbon composite energy-absorbing resistor in one of the embodiments.

[0020] Figure 2 This is a top view of the resistor.

[0021] Figure 3 This is a cross-sectional view of the resistor.

[0022] Figure 4 This is a top view of the aluminum foil sheet.

[0023] Figure 5 This is a cross-sectional view of an aluminum foil sheet.

[0024] Figure 6 This is a front view of the connecting core.

[0025] Figure 7 It is a curve of the surface temperature of the resistor element.

[0026] Explanation of reference numerals in the attached diagram: 1. Connecting core; 11. Electrode; 2. Resistance element; 3. Aluminum foil; 4. Copper busbar; 5. Fixing nut; 6. Connecting hole. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0028] This application discloses a carbon composite energy-absorbing resistor. The carbon composite energy-absorbing resistor includes a connecting core 1, resistive sheets 2, aluminum foil sheets 3, copper busbars 4, and a fixing nut 5. There are multiple resistive sheets 2 and multiple aluminum foil sheets 3, each divided into four groups. The four groups of resistive sheets 2 are arranged sequentially, with the axes of each group of resistive sheets 2 coinciding. An aluminum foil sheet 3 is sandwiched between adjacent resistive sheets 2 in each group, with the axis of each aluminum foil sheet 3 coinciding with the axis of the corresponding group of resistive sheets 2. The four groups of resistive sheets 2 are arranged sequentially, and a connecting hole 6 is provided at the center of each resistive sheet 2 and the center of each aluminum foil sheet 3. There are four connecting cores 1, each passing through one of the four groups of resistive sheets 2, thus achieving the purpose of connecting the resistive sheets 2 and aluminum foil sheets 3. In this embodiment, each group of resistors 2 consists of thirteen pieces. The aluminum foil 3 is used for heat dissipation, with a temperature rise of <700K. The operating environment is as follows: voltage ≤6KV, current ≤200A, pulse width ≤6ms, frequency ≤50Hz, continuous use time ≤15s, and usage interval ≥40min.

[0029] Furthermore, there are two copper busbars 4. The two ends of the connecting core 1 pass through the two copper busbars 4. The two ends of the connecting core 1 are set as electrodes 11. The cross-section of the electrodes 11 is made of aluminum spraying or copper spraying technology. The electrodes 11 can achieve the purpose of conducting electricity. The outer surface of the electrodes 11 is provided with external threads. The fixing nut 5 is threaded to the outside of the electrodes 11. The connecting core 1 passes through the connecting hole 6 and is threaded to the fixing nut 5. The fixing nut 5 is threaded to the two ends of the connecting core 1, realizing the fixed connection between the fixing nut 5 and the connecting core 1, while restricting the resistor 2 between the two copper busbars 4.

[0030] The connecting core 1 between the two electrodes 11 is made of glass fiber, which is an insulator. This enables the four sets of resistors 2 to be connected in parallel and the resistors 2 in the same set to be connected in series, thus realizing the basic function of the resistor.

[0031] When the user needs to adjust the resistance value of the resistor, the fixing nut 5 is removed from both ends of the connecting core 1, the copper busbar 4 is released from the constraint of each group of resistor pieces 2, and the number of each group of resistor pieces 2 is increased or decreased according to the user's needs, so as to change the resistance value of the resistor. The user does not need to re-fire the resistor, which makes it convenient for the user to adjust the resistance value of the resistor.

[0032] The resistor 2 is made of carbon composite ceramic material. Due to the non-inductive properties of carbon composite ceramic, the operating frequency of this application can reach the megahertz range, which enables the application to absorb high pulse energy and is suitable for harsh working environments such as strong pulse overload.

[0033] The technical parameters of resistor 2 are shown in the table below, where Do is the outer diameter of resistor 2 and Di is the diameter of the connecting hole 6 on resistor 2.

[0034]

[0035] Depending on the user's different requirements and parameters, including but not limited to pulse injection energy and load power, select the appropriate size of resistor 2 and the number of resistors 2 in each group, and use a glass fiber insulating bracket or directly fix it with copper busbar 4.

[0036] Reference surface temperature profile of resistor 2 Figure 7 Among them, the maximum voltage withstand per unit thickness (Vw) is:

[0037] Voltage (ms): Vw (air) = 0.87 * (R / T * A / L) 0.3 KV / cm (T is the duration of the voltage waveform)

[0038] Voltage (impulse): Vw(air) = 4.3* 1.2 (log(R / T*A / L))kV / cm(1.2 / 50us waveform)

[0039] Vw (air) = 3.0 * log(R / 2.54 * A / L) kV / cm (50 / 1000µs waveform)

[0040] Vw (air) = 1.5 * log(R / 2.54 * A / L) 1.25 KV / cm (100 / 10000us waveform)

[0041] Where A is the cross-sectional area of ​​the conductor path (cm²) 2 ), where L is the length of the conductor path (cm).

[0042] Cooling time: Thermal time constant: Γ(s)=Emax(25℃) / Wmax(25℃), where Emax(25℃): energy injected at ambient temperature, Wmax(25℃): nominal power at ambient temperature, cooling duration: t≥4Γ.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A carbon composite energy-absorbing resistor, characterized in that: The device includes a connecting core (1), a resistor (2), an aluminum foil (3), a copper busbar (4), and a fixing nut (5). There are multiple resistors (2) and multiple aluminum foils (3). The multiple resistors (2) and multiple aluminum foils (3) are divided into four groups. The four groups of resistors (2) are arranged in sequence. The axes of each group of resistors (2) coincide with each other. An aluminum foil (3) is sandwiched between each adjacent resistor (2) in each group. The axis of each group of aluminum foils (3) coincides with the axis of the corresponding group of resistors (2). The four groups of resistors (2) are arranged in sequence. There are four connecting cores (1). The four connecting cores (1) pass through the four groups of resistors (2) respectively. There are two copper busbars (4). The two ends of the connecting cores (1) pass through the two copper busbars (4). The fixing nut (5) is threaded to the two ends of the connecting cores (1).

2. The carbon composite energy-absorbing resistor according to claim 1, characterized in that: The two ends of the connecting core (1) are set as electrodes (11), and the part of the connecting core (1) between the two electrodes (11) is made of glass fiber.

3. A carbon composite energy-absorbing resistor according to claim 2, characterized in that: The outer surface of the electrode (11) is provided with an external thread, and the fixing nut (5) is threaded to the outside of the electrode (11).

4. A carbon composite energy-absorbing resistor according to claim 3, characterized in that: Both the center of the resistor sheet (2) and the center of the aluminum foil sheet (3) are provided with connecting holes (6), and the connecting core (1) passes through the connecting hole (6) and is threaded to the fixing nut (5).

5. A carbon composite energy-absorbing resistor according to claim 4, characterized in that: The resistor (2) is made of carbon composite ceramic material.

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