Bus, frequency converter and electrical equipment

Abstract

The utility model discloses a bus, frequency converter and electrical equipment relates to electrical equipment technical field, the bus includes: conductive metal bar and protective metal plate, conductive metal bar has the mounting portion, the mounting portion has its first side and second side in its thickness direction, the first side of mounting portion is used for the installation of binding post, and the second side is used for the installation of protective metal plate. The mounting part is fixedly connected with the wiring terminal through a fastener; the protective metal plate is arranged on the first side of the mounting part; wherein the rigidity of the protective metal plate is greater than that of the conductive metal bar. According to the technical scheme provided by the utility model, the protective metal plate is arranged on the first side of the mounting part, so that the protective metal plate is directly propped against the wiring terminal, the protective metal plate bears larger pressure, the protective metal plate is not easy to deform greatly due to the larger rigidity of the protective metal plate, the intensity of pressure dispersed on the guide wire row is smaller, and the protective metal plate is not easy to deform. Therefore, the guide wire row hardly deforms, and the technical effect of improving large deformation at the lap joint of the bus and the wiring terminal is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field, especially a bus, frequency converter and electrical equipment. BACKGROUND

[0002] In prior art, the connecting mode of the terminal and the conductive metal bar (aluminum bar) is direct contact, and then the connecting piece is used for fixed connection, in order to make the two firmly connected, the terminal will have a greater pressure on the conductive metal bar during the connecting process of the connecting piece, and the conductive metal bar will be deformed due to poor rigidity.

[0003] The conductive metal bar is bent, and the lap joint contact surface is uneven, which can cause oxidation film, wrinkles and bulging, thereby affecting the tightness of the contact surface and increasing the contact resistance. Generally, the contact resistance of the bolt connecting point should not exceed 20% of the resistance of the same length conductive metal bar itself, and uneven contact surface can cause uneven current distribution and affect the normal work of the conductive metal bar. UTILITY MODEL CONTENT

[0004] The utility model discloses a bus, frequency converter and electrical equipment, which aims to improve the problem of large deformation of the lap joint position when the bus is lap jointed with the terminal.

[0005] To achieve the above object, the utility model provides a bus, which comprises a conductive metal bar and a protective metal plate, the conductive metal bar has a mounting portion, the mounting portion has a first side and a second side in the thickness direction, the first side of the mounting portion is used for mounting the terminal, and the mounting portion is tightly connected with the terminal through a fastener; the protective metal plate is arranged on the first side of the mounting portion; wherein the rigidity of the protective metal plate is greater than that of the conductive metal bar.

[0006] In an embodiment, the thermal conductivity of the protective metal plate is greater than that of the conductive metal bar; and / or,

[0007] The carrying capacity of the protective metal plate is greater than that of the conductive metal bar.

[0008] In an embodiment, the conductive metal bar comprises an aluminum bar; and / or,

[0009] The protective metal plate comprises a copper plate.

[0010] In an embodiment, one side of the protective metal plate towards the conductive metal bar is provided with a first protective metal layer, which is used to prevent the protective metal plate and the mounting portion from electrochemical corrosion; and / or,

[0011] The installation part is provided with a second protective metal layer on the side facing the protective metal plate, which is used to prevent electrochemical corrosion of the protective metal plate and the installation part.

[0012] In an embodiment, the first protective metal layer and / or the second protective metal layer comprises a nickel plating layer or a tin plating layer.

[0013] In an embodiment, the installation part is provided with a first installation hole along the thickness direction thereof;

[0014] The protective metal plate is provided with a second installation hole penetrating along the thickness direction thereof, which is provided corresponding to the first installation hole and used to pass a fastener.

[0015] In an embodiment, the busbar further comprises a plurality of rivets, the installation part is provided with a plurality of first riveting holes, the protective metal plate is provided with a plurality of second riveting holes corresponding to the plurality of first riveting holes, and each rivet passes through each first riveting hole and each second riveting hole to fixedly connect the conductive metal strip and the protective metal plate.

[0016] In an embodiment, the protective metal plate is provided with a first counterbore at the side opposite to the conductive metal strip and at the port of the second riveting hole, and the rivet has a first end portion accommodated in the first counterbore; and / or,

[0017] The second side of the conductive metal strip is provided with a second counterbore at the port of the first riveting hole, and the rivet has a second end portion accommodated in the second counterbore.

[0018] The utility model also provides a frequency converter, the frequency converter includes the busbar of any one of the above.

[0019] The utility model also provides an electrical equipment, the electrical equipment includes the frequency converter.

[0020] The technical scheme of the utility model sets the protective metal plate on the first side of the installation part, so that the protective metal plate directly abuts against the terminal, the protective metal plate is subjected to a large pressure, and does not deform greatly due to the large rigidity of the protective metal plate, and the pressure on the guide wire strip is small, so that the guide wire strip also hardly deforms, and the technical effect of improving the large deformation of the busbar and the terminal at the lap joint position is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0022] Figure 1 The structure explosion schematic diagram of the busbar in the embodiment provided by the present application is shown in the figure.

[0023] Figure 2 The Figure 1 The front view of the busbar in the embodiment provided by the present application is shown in the figure.

[0024] Figure 3 The Figure 1 The side view of the busbar in the embodiment provided by the present application is shown in the figure.

[0025] Figure 4 The Figure 1 The rear view of the busbar in the embodiment provided by the present application is shown in the figure.

[0026] Figure 5 The Figure 1 The rivet part structure schematic diagram of the busbar in the embodiment provided by the present application is shown in the figure.

[0027] Figure 6 The structure schematic diagram of the frequency converter in the embodiment provided by the present application is shown in the figure.

[0028] Figure 7 The structure schematic diagram of a kind of terminal in prior art is shown in the figure.

[0029] Figure 8 The structure schematic diagram of another kind of terminal in prior art is shown in the figure.

[0030] Explanation of figure mark:

[0031] 100, busbar; 1, conductive metal row; 11, mounting part; 111, first mounting hole; 112, first riveting hole; 113, second counterbore; 2, protective metal plate; 21, second mounting hole; 22, second riveting hole; 23, first counterbore; 3, rivet; 31, first end part; 32, second end part.

[0032] 200, frequency converter; 210, terminal; 220, fastener.

[0033] The realization, functional characteristics and advantages of the present application will be further explained by combining with embodiments and referring to the drawings. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0035] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0036] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0037] In the prior art, the connection mode of the wiring terminal and the conductive metal bar (aluminum bar) is direct contact, and then a connecting piece is used for fixed connection. In order to firmly connect the two, the connecting piece will have a relatively large pressure on the conductive metal bar during the connection process, and the conductive metal bar will be deformed due to the poor rigidity of the conductive metal bar. The conductive metal bar is bent, the contact surface of the lap joint is uneven, and the phenomena of oxidation film, wrinkle and bulge occur, thereby affecting the tightness of the contact surface and increasing the contact resistance. Generally, the contact resistance of the bolt connection point should not exceed 20% of the resistance of the conductive metal bar itself of the same length, and the uneven contact surface will cause uneven current distribution, affecting the normal work of the conductive metal bar.

[0038] In order to improve the problem that the deformation of the lap joint position is large when the busbar is lap jointed with the wiring terminal.

[0039] The utility model provides a kind of busbar.

[0040] Please refer to Figure 1In an embodiment of the utility model, the busbar 100 includes a conductive metal strip 1 and a protective metal plate 2, the conductive metal strip 1 has a mounting portion 11, the mounting portion 11 has a first side and a second side in the thickness direction, the first side of the mounting portion 11 is used for mounting a connecting terminal 210, and the mounting portion 11 is fastened and connected with the connecting terminal 210 through a fastener 220; the protective metal plate 2 is arranged on the first side of the mounting portion 11; wherein the rigidity of the protective metal plate 2 is greater than the rigidity of the conductive metal strip 1.

[0041] The conductive metal strip 1 has a mounting portion 11, the mounting portion 11 is used for fixedly mounting the connecting terminal 210, and enables the connecting terminal 210 and the conductive metal strip 1 to be electrically connected. The connecting terminal 210 has the following two forms: please refer to Figure 7 The first connecting terminal 210 is provided with a U-shaped connecting terminal. Please refer to Figure 8 The second connecting terminal 210 is provided with an O-shaped connecting terminal. The connecting end of the connecting terminal 210 is attached on the mounting portion 11 of the conductive metal strip 1, and then the two are connected through the fastener 220, in the fastening process, the mounting portion 11 is prone to deformation, thereby affecting the final attachment effect and the conductivity.

[0042] Therefore, in the application, the protective metal plate 2 is arranged on the first side of the mounting portion 11, so that the protective metal plate 2 directly abuts against the connecting terminal 210, the protective metal plate 2 will be subjected to a large pressure, and since the rigidity of the protective metal plate 2 is large, it will not be greatly deformed, and the pressure on the conductive metal strip 1 is small, so that the conductive metal strip 1 is also hardly deformed, thereby achieving the technical effect of improving the deformation of the busbar 100 and the connecting terminal 210 at the lap joint.

[0043] Generally, heat is easily concentrated at the lap joint of the conductive metal strip 1 and the connecting terminal 210, and the local high temperature will accelerate the oxidation process, so that an oxide layer is formed on the contact surface, thereby reducing the conductivity. The increase of the contact resistance will further cause local overheating, forming a vicious cycle. It can also cause damage to the equipment and has safety hazards, and the system stability will also be affected. In order to solve the problem of local overheating, in an embodiment, the thermal conductivity of the protective metal plate 2 is greater than the thermal conductivity of the conductive metal strip 1, so that the heat dissipation effect is better at the lap joint with the connecting terminal, thereby reducing the temperature at the lap joint.

[0044] In an embodiment, in order to make the arrangement of the protective metal plate 2 not affect the conductivity, the current-carrying capacity of the protective metal plate 2 is greater than the current-carrying capacity of the conductive metal strip 11, so that the current is more easily conducted between the connecting terminal 210 and the conductive metal strip 11.

[0045] In view of the economy of the busbar 100, in the present embodiment, the conductive metal strip 1 is provided as an aluminum strip, which comprises an aluminum strip; the price of aluminum is much lower than that of copper, and thus the use of an aluminum strip can reduce material costs.

[0046] In the present embodiment, the protective metal plate 2 is provided as a copper plate, which has the following advantages: first, the rigidity of the copper plate is stronger than that of the aluminum plate, and the copper plate is not easy to deform when fixedly connected with the terminal 210. Second, the problem of excessively high local temperature can be improved; when the copper plate is provided on the first side, the contact resistance between the copper plate and the terminal 210 is smaller than the contact resistance between the aluminum strip and the terminal 210, which fundamentally reduces the generation of heat, and the thermal conductivity of copper is also high, thereby having better heat dissipation capacity. In addition, the copper plate has a larger carrying capacity.

[0047] In the embodiments involved in the utility model, the protective metal plate 2 is directly attached to the conductive metal strip 1, and for example, when the copper plate and the aluminum strip are taken, after humid gas enters the connection, a local battery is formed, which corrodes the aluminum; aluminum is trivalent, while copper is divalent, which also increases the contact resistance and further reduces the carrying capacity. In order to prevent the formation of the primary battery, the following methods can be used:

[0048] The first embodiment is that the protective metal plate 2 is provided with a first protective metal layer on the side facing the conductive metal strip 1, wherein the first protective metal layer is used to prevent electrochemical corrosion between the protective metal plate 2 and the mounting portion 11; the first protective metal layer can cover the surface of the protective metal plate 2 to form a protective film, thereby preventing the direct contact between the corrosion medium and the protective metal plate 2.

[0049] The second embodiment is that the mounting portion 11 is provided with a second protective metal layer on the side facing the protective metal plate 2, and the second protective metal layer is used to prevent electrochemical corrosion between the protective metal plate 2 and the mounting portion 11; the second protective metal layer can cover the surface of the mounting portion 11 to form a protective film, thereby preventing the direct contact between the corrosion medium and the mounting portion 11.

[0050] The third embodiment is that the protective metal plate 2 is provided with a first protective metal layer on the side facing the conductive metal strip 1, and the mounting portion 11 is provided with a second protective metal layer on the side facing the protective metal plate 2; even if one of the protective layers is damaged, the other protective layer can still play a protective role.

[0051] In one embodiment, the first protective metal layer and / or the second protective metal layer comprises a nickel plating layer or a tin plating layer. The plating layer usually adopts a metal with a negative potential (such as tin, nickel, etc.), because these metals act as anodes in the electrochemical reaction, while the metal matrix of the conductive metal strip 1 and the protective metal plate 2 acts as a cathode. When corrosion occurs, the metal with a negative potential (i.e. the sacrificial anode) is first oxidized and corroded, thereby protecting the metal matrix of the conductive metal strip 1 and the protective metal plate 2 from corrosion. This mechanism is called "sacrificial anode protection", in which the sacrificial anode gradually consumes, thereby protecting the metal matrix of the conductive metal strip 1 and the protective metal plate 2.

[0052] The connecting manner of the mounting portion 11 and the terminal 210 is various, such as providing a terminal post on the mounting portion 11, and connecting the terminal 210 with the terminal post; or providing a hole on the mounting portion 11, and riveting between the mounting portion 11 and the terminal 210. In the embodiment, please refer to Figures 1 to 4 , the mounting portion 11 is provided with a first mounting hole 111 along the thickness direction thereof; the protective metal plate 2 is provided with a second mounting hole 21 along the thickness direction thereof, and the second mounting hole 21 is correspondingly provided with the first mounting hole 111, so as to pass through the fastener 220, which can be a screw or a rivet. Generally, the fastener 220 comprises a screw, the screw passes through the second mounting hole 21 and the first mounting hole 111, the head of the screw abuts against the terminal 210, and the rod of the screw can be connected with the threaded hole inside the equipment, so that the conductive metal strip 1, the protective metal plate 2 and the terminal 210 can be fixed by one screw.

[0053] In order to tightly and fixedly connect the mounting portion 11 and the protective metal plate 2, in one type of embodiment, please refer to Figure 1 and Figure 5 , the busbar 100 further comprises a plurality of rivets 3, the conductive metal strip 1 is further provided with a plurality of first riveting holes 112 in the mounting area, the protective metal plate 2 is provided with a plurality of second riveting holes 22 corresponding to the plurality of first riveting holes 112, and the rivets 3 pass through the first riveting holes 112 and the second riveting holes 22 to fixedly connect the conductive metal strip 1 and the protective metal plate 2. Of course, the connecting manner of the conductive metal strip 1 and the protective metal plate 2 is not limited to the above manner, and the screw or bolt can also be used for fixed connection.

[0054] Since the side of the protective metal plate 2 away from the conductive metal strip 1 needs to abut against the terminal 210, when the rivet 3 protrudes from the side of the protective metal plate 2 away from the conductive metal strip 1 after riveting, the terminal 210 cannot abut against the side of the protective metal plate 2, resulting in poor conduction effect. In order to prevent the rivet 3 from protruding after riveting, in one embodiment, please refer to Figures 1 to 4A first counterbore 23 is arranged at the end of the second rivet hole 22 on the side of the protective metal plate 2 opposite to the conductive metal strip 1, and the rivet has a first end 31 arranged in the first counterbore 23.

[0055] In an embodiment, a second counterbore 113 is arranged at the end of the first rivet hole 112 on the second side of the conductive metal strip 1, and the rivet has a second end 32 arranged in the second counterbore 113. Thus, the second end 32 is arranged without protruding, so as to avoid causing adverse effects.

[0056] For the busbar 100, only the first counterbore 23 can be arranged in the first type of embodiment, only the second counterbore 113 can be arranged in the second type of embodiment, and both the first counterbore 23 and the second counterbore 113 can be arranged in the third type of embodiment.

[0057] The utility model also provides a frequency converter 200, the frequency converter 200 includes busbar 100, and the specific structure of busbar 100 refers to the above-mentioned embodiment, because the frequency converter 200 adopts all the technical schemes of the above-mentioned embodiments, so at least has all the beneficial effects brought by the technical schemes of the above-mentioned embodiments, and here will not be repeated.

[0058] The frequency converter 200 can include only one busbar 100, or can include a plurality of busbars 100, in an embodiment, the frequency converter 200 includes a plurality of busbars 100, and the plurality of busbars 100 are stacked at the mounting portion 11. The busbar 100 is provided with the first counterbore 23 and the second counterbore 113, and the mounting portion 11 of one busbar can be attached to the protective metal plate 2 of another busbar, so as to ensure the conductive effect.

[0059] The utility model also provides an electrical appliance, and the electrical appliance includes the frequency converter 200. One electrical appliance can include one or a plurality of frequency converters 200 at the same time, and has all the beneficial effects of the above-mentioned frequency converter 200, and here will not be repeated.

[0060] The above-mentioned is only the exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the drawings contents, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A busbar, characterized in that The busbar comprises: a conductive metal strip having a mounting portion with a first side and a second side in a thickness direction of the mounting portion, the first side of the mounting portion being configured to mount a terminal, and the mounting portion being fastened to the terminal by a fastener; and a protective metal plate arranged on the first side of the mounting portion, wherein the protective metal plate has a rigidity greater than that of the conductive metal strip.

2. The busbar of claim 1, wherein The protective metal plate has a thermal conductivity greater than that of the conductive metal strip; and / or The protective metal plate has a current carrying capacity greater than that of the conductive metal strip.

3. The busbar of claim 1 or 2, wherein The conductive metal strip comprises an aluminum strip; and / or The protective metal plate comprises a copper plate.

4. The busbar of claim 1, wherein A first protective metal layer is arranged on a side of the protective metal plate facing the conductive metal strip, and the first protective metal layer is configured to prevent electrochemical corrosion between the protective metal plate and the mounting portion; and / or A second protective metal layer is arranged on a side of the mounting portion facing the protective metal plate, and the second protective metal layer is configured to prevent electrochemical corrosion between the protective metal plate and the mounting portion.

5. The busbar of claim 4, wherein, The first protective metal layer and / or the second protective metal layer comprises a nickel plating layer or a tin plating layer.

6. The busbar of claim 1, wherein The mounting portion is provided with a first mounting hole in a thickness direction thereof; The protective metal plate is provided with a second mounting hole in a thickness direction thereof, and the second mounting hole is arranged corresponding to the first mounting hole to allow the fastener to pass through.

7. The busbar of claim 1, wherein The busbar further comprises a plurality of rivets, the mounting portion is provided with a plurality of first riveting holes, the protective metal plate is provided with a plurality of second riveting holes corresponding to the plurality of first riveting holes, each of the rivets passes through each of the first riveting holes and each of the second riveting holes to fixedly connect the conductive metal strip and the protective metal plate.

8. The busbar of claim 7, wherein The protective metal plate is provided with a first counterbore at a side thereof opposite to the conductive metal strip and at a port of the second riveting hole, and the rivet has a first end portion accommodated in the first counterbore; and / or The conductive metal strip is provided with a second counterbore at a side thereof opposite to the protective metal plate and at a port of the first riveting hole, and the rivet has a second end portion accommodated in the second counterbore.

9. A frequency converter, characterized in that The busbar comprises the busbar as claimed in any one of claims 1 to 8.

10. An electrical appliance characterized by The frequency converter comprises the busbar as claimed in claim 9.

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