Bus duct

Abstract

The application discloses a bus duct and belongs to the technical field of bus ducts, and the technical scheme is as follows: the bus duct comprises a shell and a bus bar group; the bus bar group comprises at least one bus bar, the bus bar comprises a base body and a cold spraying layer covering the base body; a buffer mechanism is arranged in the shell; the buffer mechanism comprises fixed bodies I and II, connecting bodies I and II, and the fixed bodies I and II are connected with each other. The buffer mechanism can provide displacement space for the bus bar group in each direction, so that the vibration frequency of the bus bar group can be changed by providing a certain amplitude change space, shock absorption is provided, the bus bar group can effectively avoid resonance with the shell, the safe and stable operation of the whole system can be effectively maintained, and the cold spraying process is applied to the coating preparation of the bus bar, so that the conductivity, heat dissipation, reliability and service life of the whole bus duct can be remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of busbar, in particular to a busbar slot. BACKGROUND

[0002] With the emergence of modern engineering facilities and equipment, the power consumption of various industries has increased rapidly, especially with the emergence of many large workshops and high-rise buildings. The traditional cable as a power transmission conductor cannot meet the requirements of large current transmission systems. The parallel use of multiple cables brings many inconveniences to on-site installation and construction connection. The emergence of busbar slots solves this problem.

[0003] Busbar slot is an efficient power distribution method. It uses copper or aluminum as the conductor, uses insulation to support, and then is installed in a metal slot to form a new type of conductor, mainly used for transmission and distribution of electric energy.

[0004] Busbar is an important component structure in busbar slot, mainly used for connecting the main switch in the power supply system and the switch in the branch circuit. The busbar is generally a solid profile with a roughly rectangular cross section. The copper-aluminum composite busbar widely used in the market is achieved by welding. Its electrical system efficiency and current-carrying capacity are significantly reduced compared to the original material. The electrical conductivity of aluminum and copper materials can reach 52% IACS and 90% IACS, but after the welding process, its electrical conductivity is only about 45-50% IACS. The copper-aluminum welding strength is only 20-30 Mpa, and the amount of copper plate used for welding is large. Because the busbar has a crucial impact on the device's electrical conductivity, heat dissipation, reliability, and lifespan, the performance of the busbar needs to be improved.

[0005] The shell is another important structure in the busbar slot, which bears multiple functions such as installing and fixing the conductor, bearing, and protection. When the busbar slot is powered on, the busbar is affected by the magnetic field and will produce electromagnetic vibration. The force direction of the multi-layer busbar is consistent, and due to the mutual superposition of forces, it will cause the busbar box to resonate, thereby causing a significant impact on the safe and stable operation of the entire system. The existing busbar shell has weak shock resistance, which needs to be effectively improved.

[0006] In order to solve the above problems, a busbar slot is provided based on the existing technology. SUMMARY

[0007] The bus duct provided by the application can provide displacement space for the bus bar group in each direction through the buffer mechanism, so that the vibration frequency of the bus bar group can be changed by providing a certain amplitude change space, and the shock absorption can be provided, so that resonance with the shell can be effectively avoided, and the safe and stable operation of the whole system can be effectively maintained.

[0008] The above technical purpose of the application is achieved by the following technical scheme:

[0009] The bus duct comprises a shell and a bus bar group, and the bus bar group comprises at least one bus bar, and the bus bar comprises a base body and a cold spraying coating on the base body.

[0010] By adopting the above technical scheme, the cold spraying technology is used to spray the conductive base body, so that the coating with uniform organization composition, small thermal stress, high bonding strength and few internal defects can be obtained, and thus the bus bar with good thermal conductivity, heat dissipation and current carrying capacity can be effectively obtained.

[0011] The application is further provided as follows: the shell is provided with a buffer structure, and the buffer structure comprises:

[0012] A fixed body I is arranged on the inner side wall of the shell.

[0013] A connecting body I is rotationally connected to the first end of the fixed body I.

[0014] A connecting body II is connected to the second end of the connecting body I, the bottom surface of the connecting body II is provided with a toothed segment, the outer wall of the connecting body II is slidingly connected with a connecting body III, the outer wall of the connecting body III is fixedly connected with a fixed bus rack, and the top end and the bottom end of the fixed bus rack are embedded in the inner top end and the inner bottom end of the shell, respectively.

[0015] A fixed body II is rotationally connected to the end of the connecting body III, and the fixed body II is rotationally connected with a gear, and the gear is engaged with the toothed segment.

[0016] By adopting the technical scheme, the fixed body I and the fixed body II are fixedly installed on the inner side wall of the shell to form two fixed support points of the buffering mechanism; meanwhile, the fixed body I, the connecting body I and the end of the connecting body II are sequentially connected in a head-to-tail mode, wherein the connecting body I and the connecting body II can move within a certain range; the movement track of the connecting body I is a circular arc with the fixed body I as the support point, the movement track of the connecting body II is displacement along the extension direction of the connecting body II, and the connecting body I and the connecting body II influence and restrict each other; the connecting position of the connecting body I and the connecting body II is a movable connection, and the height of the connecting position of the connecting body I and the connecting body II is higher than the height of the fixed body I and the fixed body II.

[0017] When the bus duct vibrates due to power-on vibration, the bus bar group drives the fixed rack and the connecting body III to vibrate synchronously, the connecting body III can swing within the mutual restriction range of the connecting body II with the fixed body II as the axis, when the connecting body II and the connecting body III produce relative movement, the gear starts to rotate, and the connecting rod II will produce displacement within the restriction range of the connecting body III in the form of dynamic meshing with the gear; the angle formed between the connecting body I and the connecting body II also changes to adapt to the displacement change of the connecting body II, the connecting body III and the fixed rack in the corresponding direction, so that displacement space can be provided for the bus bar group in each direction, the vibration frequency of the bus bar group is changed by providing a certain amplitude change space, shock absorption is provided, so that resonance with the shell can be effectively avoided, and the safe and stable operation of the whole system can be effectively maintained.

[0018] The top end and the bottom end of the fixed rack are respectively embedded in the inner top end and the inner bottom end of the shell, and the stability of the bus bar group can be effectively maintained.

[0019] The connecting body II is further provided with at least one limiting body II, and the limiting body I and the limiting body II are embedded with each other.

[0020] By adopting the technical scheme, the relative displacement of the connecting body I and the connecting body II can be limited within a certain range through the embedded limiting body I and the limiting body II.

[0021] The bus bar is further provided with a connecting end, and the projection plane of the connecting end in the vertical direction is a non-plane.

[0022] The thickness of the connecting end close to one end of the shell is greater than the thickness of the connecting end far away from the other end of the shell.

[0023] By adopting the technical scheme, through the non-planar structure of the arc surface and the bending surface, firstly, the structure can make the contact surface of the busbar end and the corresponding busbar joint structure larger, prevent loosening during use, on one hand, play a protective role on electromagnetic vibration during power transmission, on the other hand, help to keep good contact, keep low resistance, have good electric conduction and heat dissipation performance, and be beneficial to the transmission of electric energy, secondly, the structure can also enhance the effect of air convection by changing the curvature of the end, thereby improving the heat exchange speed to improve the heat dissipation performance, keeping the temperature rise of the equipment within a reasonable range, and effectively protecting the long-term stable operation of the busbar slot.

[0024] The application is further provided that: the preparation method of the cold spraying layer is as follows:

[0025] S1, taking raw material powder one and raw material powder two for standby;

[0026] S2, surface treatment is performed on the substrate to obtain a spraying surface;

[0027] S3, the raw material powder one is deposited on the surface of the spraying surface by cold spraying process to obtain a cold spraying layer one;

[0028] S4, the raw material powder two is deposited on the surface of the cold spraying layer one by cold spraying process.

[0029] By adopting the above technical scheme, the surface of the busbar is sprayed at least twice, and the particle size of the raw material powder sprayed gradually decreases, the coating can be further densified by the second cold spraying, so that a coating with uniform tissue composition, small thermal stress, high bonding strength and few internal defects can be obtained, and a busbar with good electric conduction performance, heat dissipation performance and current carrying capacity can be obtained, so as to replace the existing welding process of copper-clad busbar; the electric conductivity of the aluminum material and the copper material of the existing copper-clad aluminum busbar reaches 52%IACS and 90%IACS respectively, but after the welding process, the electric conductivity is only 45-50%IACS, and after the cold spraying process of the application, the electric conductivity can reach more than 70%IACS.

[0030] Moreover, when copper and aluminum are exposed to acidic or alkaline air, a galvanic cell reaction occurs, and inevitably, the end surface is exposed to air, and a galvanic cell reaction occurs, thereby resulting in low reliability and short service life during use, the copper coating structure obtained by the cold spraying process has a density of more than 99%, which can effectively prevent corrosion and improve the service life.

[0031] The raw material powder one has a particle size of 5-50 microns, and the raw material powder two has a particle size of 100-200 nanometers.

[0032] By adjusting the particle sizes of the raw material powder one and the raw material powder two in the process, the coating voids can be further filled, so that a coating with higher density can be obtained, and the corrosion prevention effect is effectively improved.

[0033] The cold spraying working gas in step S3 is one or more of air, nitrogen or helium; the spraying pressure of the cold spraying is 1-7 MPa; the spraying temperature of the cold spraying is 50-1000 DEG C; the gas speed of the cold spraying is 200-1200 m / s; and the spraying distance of the cold spraying is 5-100 mm.

[0034] The base material is aluminum or an aluminum alloy.

[0035] The raw material powder one and the raw material powder two are each composed of one or more of copper, silicon and tungsten, and the weight ratio of copper:silicon:tungsten is 94-99.98 wt.%:0.01-3 wt.%:0.01-3 wt.%.

[0036] By adopting the above technical solution, aluminum and copper have excellent electric conductivity and heat dissipation performance, silicon can enhance the carrier mobility of the field effect transistor, and in the cold spraying process, through diffusion and combination, silicon can also help to improve the tensile strength of the copper coating and the aluminum base material, so as to adapt to the tensile strength requirement of the material caused by the metal expansion of the busbar under high current; in addition, the silicon electron can also provide a fast migration channel, so as to buffer the volume effect of the metal expansion, thereby reducing the pressure borne by the busbar duct system, and further ensuring the stable and long-term operation of the system; in addition, the damping effect of tungsten and the good toughness of copper can effectively achieve the effect of shock absorption, so as to effectively maintain the long-term stable operation of the busbar duct system, and the combination of tungsten, copper and silicon can improve the hardness and strength through solid solution strengthening, and also improve the toughness and plasticity, and the combination of the components can also enhance the bonding strength of the coating, so as to further improve the corrosion prevention performance.

[0037] In summary, the present application has the following advantages:

[0038] 1. The buffer mechanism can provide displacement space for the busbar group in each direction, so as to change the vibration frequency by providing a certain amplitude change space for the busbar group, and provide shock absorption, so as to effectively avoid resonance with the shell and effectively maintain the safe and stable operation of the entire system.

[0039] 2. This invention applies a cold spraying process to the preparation of the busbar coating and designs the composition of the coating. This effectively solves the problem that the conductivity and current carrying capacity of the coating welding process in the prior art are significantly reduced compared with the original material. It also significantly improves the overall conductivity, heat dissipation, bonding strength, reliability and life of the busbar trunking. Attached Figure Description

[0040] Figure 1 This is an application diagram of Embodiment 1 of the present invention;

[0041] Figure 2 This is an application diagram of Embodiment 2 of the present invention;

[0042] Figure 3 This is a schematic diagram of the unfolded structure of the buffer mechanism in Embodiment 1 of the present invention;

[0043] Figure 4 This is a schematic diagram of the buffer mechanism in Embodiment 1 of the present invention;

[0044] Figure 5 This is a partially enlarged schematic diagram of Embodiment 1 of the present invention;

[0045] Figure 6 This is a schematic diagram of the substrate and cold spray coating structure of the connection end B in Embodiment 1 of the present invention.

[0046] In the diagram: 1. Shell; 11. Buffer mechanism; 111. Fixing body I; 112. Connecting body I;

[0047] 113. Connector II; 1131. Toothed section; 1132. Connector III; 1133. Limiting body I; 11321. Limiting body II;

[0048] 114. Fixed body II; 115. Fixed frame; 116. Gear;

[0049] 2. Busbar; 21. Substrate; 22. Cold spray coating; 23. Connecting end; 3. Groove.

[0050] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0051] Example 1: A busbar trunking, such as Figure 1 As shown, the busbar trunking is an air-type busbar trunking, which includes a housing 1 and a busbar assembly; the top of the housing 1 is provided with a groove 3. The busbar assembly includes at least one busbar 2, which includes a substrate 21 and a cold-sprayed coating 22 covering the substrate 21, the thickness of which is 20 micrometers.

[0052] The housing 1 is provided with a buffer mechanism 11; the buffer mechanism 11 includes:

[0053] The fixed body Ⅰ 111 is fixedly installed on the inner side wall of the shell 1.

[0054] The first end of the connecting body Ⅰ 112 is rotatably connected with the fixed body Ⅰ 111.

[0055] The connecting body Ⅱ 113 is connected with the second end of the connecting body Ⅰ 112. The bottom surface of the connecting body Ⅱ 113 is provided with a toothed segment 1131. The outer wall of the connecting body Ⅱ 113 is slidably connected with a connecting body Ⅲ 1132. The outer wall of the connecting body Ⅲ 1132 is fixedly connected with a fixed row frame 115. The top end and the bottom end of the fixed row frame 115 are respectively embedded in the groove 3 of the shell 1.

[0056] The fixed body Ⅱ 114 is rotatably connected with the end of the connecting body Ⅲ 1132. The fixed body Ⅱ 114 is rotatably connected with a gear 116. The gear 116 is engaged with the toothed segment 1131.

[0057] The outer side wall of the connecting body Ⅱ 113 is provided with at least one limiting body Ⅰ 1133. The inner side wall of the connecting body Ⅲ 1132 is provided with at least one limiting body Ⅱ 11321. The limiting body Ⅰ 1133 and the limiting body Ⅱ 11321 are embedded with each other.

[0058] The female bus 2 is provided with a connecting end 23. The projection plane of the connecting end 23 in the vertical direction is a non-planar surface.

[0059] The thickness of the connecting end 23 close to one end of the shell 1 is greater than the thickness of the connecting end 23 away from one end of the shell 1.

[0060] Example 2: The difference from example 1 is that, as shown in the figure, the bus duct is a dense bus duct. The thickness of the cold spraying layer 22 is 500 microns. Figure 2

[0061] Example 3: A bus duct, the bus duct comprises a shell 1 and a female bus 2 group; the female bus 2 group comprises at least one female bus 2. The female bus 2 comprises a base body 21 and a cold spraying layer 22 covering the base body 21. The preparation method of the cold spraying layer 22 is as follows:

[0062] S1, raw material powder one and raw material powder two are prepared for use;

[0063] S2, the surface of the base body 21 is subjected to shot blasting treatment to obtain a sprayed surface;

[0064] S3, raw material powder one is deposited on the surface of the sprayed surface by cold spraying process to obtain a cold spraying layer one;

[0065] S4, raw material powder two is deposited on the surface of the cold spraying layer one by cold spraying process.

[0066] The particle size of the raw material powder one is 5 microns, and the particle size of the raw material powder two is 100 nanometers.​

[0067] The cold spraying working gas of step S3 is one or more of air, nitrogen or helium; the cold spraying jet pressure is 1 Mpa; the cold spraying jet temperature is 50°C; the cold spraying gas velocity is 200 m / s; and the cold spraying jet distance is 5 mm.

[0068] The base body 21 is an aluminum alloy.

[0069] The raw material powder one and the raw material powder two each include copper, silicon and tungsten, and the weight ratio of copper: silicon: tungsten is 94 wt.%: 3 wt.%: 3 wt.%.

[0070] Example 4: Different from example 3, the raw material powder one and the raw material powder two each include copper, silicon and tungsten, and the weight ratio of copper: silicon: tungsten is 95 wt.%: 2.3 wt.%: 2.7 wt.%.

[0071] Example 5: Different from example 3, the raw material powder one and the raw material powder two each include copper, silicon and tungsten, and the weight ratio of copper: silicon: tungsten is 96 wt.%: 1 wt.%: 3 wt.%.

[0072] Example 6: Different from example 3, the raw material powder one and the raw material powder two each include copper, silicon and tungsten, and the weight ratio of copper: silicon: tungsten is 97 wt.%: 1.9 wt.%: 1.1 wt.%.

[0073] Example 7: Different from example 3, the raw material powder one and the raw material powder two each include copper, silicon and tungsten, and the weight ratio of copper: silicon: tungsten is 98 wt.%: 1.5 wt.%: 0.5 wt.%.

[0074] Example 8: Different from example 3, the raw material powder one and the raw material powder two each include copper, silicon and tungsten, and the weight ratio of copper: silicon: tungsten is 99.98 wt.%: 0.01 wt.%: 0.01 wt.%.

[0075] Example 9: Different from example 3, the particle size of the raw material powder one is 15 μm, and the particle size of the raw material powder two is 120 nm; the cold spraying working gas of step S3 is helium; the cold spraying jet pressure is 5 Mpa; the cold spraying jet temperature is 400°C; the cold spraying gas velocity is 600 m / s; and the cold spraying jet distance is 45 mm.

[0076] Example 10: Different from example 3 in that: the particle size of the raw material powder one is 30 μm, the particle size of the raw material powder two is 145 nm; the cold spraying working gas of step S3 is nitrogen; the spraying pressure of cold spraying is 6.5 Mpa; the spraying temperature of cold spraying is 620℃; the gas speed of cold spraying is 850 m / s; the spraying distance of cold spraying is 72 mm.

[0077] Example 11: Different from example 3 in that: the particle size of the raw material powder one is 45 μm, the particle size of the raw material powder two is 170 nm; the cold spraying working gas of step S3 is nitrogen; the spraying pressure of cold spraying is 4.5 Mpa; the spraying temperature of cold spraying is 890℃; the gas speed of cold spraying is 1020 m / s; the spraying distance of cold spraying is 93 mm.

[0078] Example 12: Different from example 3 in that: the substrate 21 is aluminum; the cold spraying working gas of step S3 is nitrogen; the spraying pressure of cold spraying is 7 Mpa; the spraying temperature of cold spraying is 1000℃; the gas speed of cold spraying is 1200 m / s; the spraying distance of cold spraying is 100 mm.

[0079] Example 13: Different from example 3 in that: the particle size of the raw material powder one is 50 μm, the particle size of the raw material powder two is 200 nm; the cold spraying working gas of step S3 is helium; the spraying pressure of cold spraying is 2 Mpa; the spraying temperature of cold spraying is 200℃; the gas speed of cold spraying is 400 m / s; the spraying distance of cold spraying is 20 mm.

[0080] Comparative example 1: Different from example 3 in that: the same amount of raw material powder one and raw material powder two are taken, and a coating is prepared on the surface of the busbar 2 by using a welding method.

[0081] The present application can effectively solve the problem of the great decline of the conductive efficiency and the current carrying capacity compared with the original material caused by the coating welding process in the prior art, and has a significant improvement effect on the conductivity, heat dissipation, bonding strength, reliability and service life of the busbar slot as a whole.

[0082] The present embodiment is only an explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make modifications to the present embodiment without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A busbar trunking system, characterized in that: The busbar trunking includes a housing (1) and a busbar assembly; the busbar assembly includes at least one busbar (2), the busbar (2) includes a substrate (21) and a cold spray coating (22) covering the substrate; The housing (1) is provided with a buffer mechanism (11); the buffer mechanism (11) includes: Fixing body I (111), the fixing body I (111) is disposed on the inner side wall of the shell (1); Connector I (112), the first end of which is rotatably connected to the fixed body I (111); Connector II (113), one end of which is connected to the second end of connector I (112); the bottom surface of connector II (113) is provided with a toothed section (1131), and connector III (1132) is slidably embedded in the outer wall of connector II (113), and a fixed frame (115) is fixedly connected to the outer wall of connector III (1132), the top and bottom ends of the fixed frame (115) are respectively embedded in the inner top and inner bottom ends of the shell (1); Fixing body II (114) is rotatably connected to the end of the connecting body III (1132), and the fixing body II (114) is rotatably connected to a gear (116), which meshes with the meshing section (1131).

2. The busbar trunking according to claim 1, characterized in that: The outer side wall of the connector II (113) is provided with at least one limiting body I (1133), and the inner side wall of the connector III (1132) is provided with at least one limiting body II (11321). The limiting body I (1133) and the limiting body II (11321) are interlocked.

3. A busbar trunking system according to claim 1, characterized in that: The busbar (2) is provided with a connecting end (23), and the thickness of the connecting end (23) near the shell (1) is greater than the thickness of the connecting end (23) away from the shell (1).

4. A busbar trunking system according to claim 1, characterized in that, The method for preparing the cold spray coating (22) is as follows: S1. Take raw material powder one and raw material powder two for later use; S2. Perform surface treatment on the substrate (21) to obtain a sprayed surface; S3. The raw material powder is deposited onto the surface of the sprayed surface using a cold spraying process to obtain a cold spray coating layer. S4. The raw material powder II is deposited on the surface of the cold spray coating layer I using a cold spraying process.

5. A busbar trunking system according to claim 4, characterized in that: The particle size of the first raw material powder is 5-50 μm, and the particle size of the second raw material powder is 100-200 nm.

6. A busbar trunking system according to claim 5, characterized in that: The working gas for cold spraying in step S3 is one or more of air, nitrogen, or helium; the spraying pressure for cold spraying is 1–7 MPa; the spraying temperature for cold spraying is 50–1000°C; the gas velocity for cold spraying is 200–1200 m / s; and the spraying distance for cold spraying is 5–100 mm.

7. A busbar trunking system according to claim 4, characterized in that: The substrate (21) is aluminum or an aluminum alloy.

8. A busbar trunking system according to claim 7, characterized in that: The components of raw material powder one and raw material powder two are one or more of copper, silicon and tungsten, and the weight ratio of copper:silicon:tungsten is 94-99.98 wt.%:0.01-3 wt.%:0.01-3 wt.%.

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