Lead clamping device and transformer structure

Abstract

The utility model discloses a lead wire clamping device and a transformer structure, the lead wire clamping device comprises a clamping main body, the clamping main body comprises a plurality of clamping single bodies, and the plurality of clamping single bodies are connected to form a clamping cavity for clamping a lead wire; the fastener comprises a fastening screw rod and a fastening nut, at least one of the clamping single bodies is internally provided with a limiting cavity and a first connecting cavity, and the other clamping single bodies are internally provided with second connecting cavities; the inner wall of the first connecting cavity and the inner wall of the second connecting cavity are connected with the fastening screw to form connection of the clamping single bodies, the fastening nut is arranged in the limiting cavity and connected with the fastening screw to limit the lead in the clamping cavity, and when the fastening nut is placed in the limiting cavity, the top face of the fastening nut is lower than or equal to the height of the top face of the limiting cavity. According to the lead clamping device, the height space independently occupied by the nut is reduced, the lead space utilization rate is improved, the lead clamping reliability is guaranteed, and miniaturization and light weight of a transformer are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, and more specifically, to a lead clamping device. In addition, the utility model also relates to a transformer structure including the above lead clamping device. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage for power transmission, and is usually used in the power system, and has become one of the important devices in the rail transit, power distribution, and power transmission and transformation industries.

[0003] With the development of science and technology, aiming at the problem of limited available space for electrical equipment and the increasing requirement for equipment lightweight, the miniaturization and lightweight design of compact and lightweight structural transformers are imminent in railway applications. As an important part of the internal connection leads of the transformer, the lead clamping part plays a role in protecting and fixing the leads.

[0004] In the related art, the transformer lead clamping part is fastened by protruding four-corner insulating nuts. The insulating nuts protrude, so they separately occupy the height space of the leads, resulting in a reduced utilization rate of the height space of the leads and not meeting the design requirements of miniaturization and compactness.

[0005] In summary, how to provide a lead clamping part that can avoid occupying the height space of the leads is an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model

[0006] In view of this, the purpose of the utility model is to provide a lead clamping device, which reduces the height space separately occupied by the nuts, improves the utilization rate of the lead space, ensures the reliability of lead clamping, and realizes the miniaturization and lightweight of the transformer. Another purpose of the utility model is to provide a transformer structure including the above lead clamping device.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A lead clamping device, comprising:

[0009] A clamping main body, including a plurality of clamping monomers, and the plurality of clamping monomers are connected to form a clamping cavity for clamping leads;

[0010] A fastener, including a fastening screw rod and a fastening nut. At least one of the plurality of clamping monomers is provided with a limiting cavity and a first connection cavity, and the other clamping monomers are provided with second connection cavities;

[0011] The inner walls of the first connecting cavity and the second connecting cavity are both connected to the fastening screw to form the connection of several clamping monomers. The fastening nut is arranged in the limiting cavity and connected to the fastening screw to limit the lead wire in the clamping cavity. When the fastening nut is placed in the limiting cavity, the top surface of the fastening nut is lower than or equal to the top surface of the limiting cavity.

[0012] Preferably, the fastening nut is a trapezoidal nut, and the height of the trapezoidal nut is less than or equal to the height of the limiting cavity.

[0013] Preferably, the diameter of the trapezoidal nut at the end close to the limiting cavity is larger than the diameter at the end far from the limiting cavity.

[0014] Preferably, the fastening nut is provided with an operation hole for facilitating the fastening of an operation tool and a threaded hole for threaded connection with the fastening screw.

[0015] Preferably, the limiting cavity has a tapered counterbore, and the outer peripheral wall surface of the fastening nut is fitted with the inner wall of the tapered counterbore.

[0016] Preferably, the clamping body includes a first clamping monomer and a second clamping monomer. The first clamping monomer and the second clamping monomer are arranged opposite to each other, and both are provided with grooves. The grooves of the two enclose to form the clamping cavity.

[0017] Preferably, at least one of the first clamping monomer and the second clamping monomer is provided with the limiting cavity, and the limiting cavity is communicated with the first connecting cavity.

[0018] Preferably, several groups of the fasteners are symmetrically arranged on both sides of the clamping cavity.

[0019] Preferably, the fastening nut, the fastening screw, and the clamping body are all insulating components.

[0020] The present utility model also provides a transformer structure, including the lead wire clamping device described in any one of the above.

[0021] The lead clamping device provided by the present utility model includes a clamping main body and a fastener. The clamping main body includes a plurality of clamping monomers, and the plurality of clamping monomers are connected by the fastener to form a clamping cavity for clamping a lead. The fastener includes a fastening screw and a fastening nut. At least one of the plurality of clamping monomers is provided with a limiting cavity and a first connecting cavity, and the other clamping monomers are provided with second connecting cavities. The fastening screw passes through the inner walls of the first connecting cavity and the second connecting cavity to connect the plurality of clamping monomers, and the fastening nut is arranged in the limiting cavity and connected to the fastening screw, so that the lead is reliably clamped in the clamping cavity. When the fastening nut is placed in the limiting cavity, the top surface height thereof is lower than or equal to the top surface height of the limiting cavity. When the fastening nut is used in cooperation with the fastening screw, it will not protrude from the clamping main body and will not occupy the space in the height of the lead, improving the utilization rate of the lead space and ensuring the reliability of lead clamping. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0023] Figure 1 is a schematic structural diagram of the lead clamping device provided by the present utility model;

[0024] Figure 2 is a cross-sectional view of the lead clamping device provided by the present utility model;

[0025] Figure 3 is another cross-sectional view of the specific lead clamping device provided by the present utility model;

[0026] Figure 4 is a schematic structural diagram of the fastening nut provided by the present utility model.

[0027] Figures 1 - 4 Among them, the reference numerals include:

[0028] 1 - fastening screw; 2 - fastening nut; 3 - lead; 4 - first clamping monomer; 5 - second clamping monomer; 6 - limiting cavity;

[0029] 21 - operation hole; 22 - threaded hole. Detailed Embodiment

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] The core of the present invention is to provide a lead clamping device, which reduces the height space occupied by the nut alone, improves the utilization rate of the lead space, ensures the reliability of lead clamping, and realizes the miniaturization and light weight of the transformer. Another core of the present invention is to provide a transformer structure including the above-mentioned lead clamping device.

[0032] Please refer to Figures 1 to 3 , the lead clamping device provided by the present invention includes a clamping main body and a fastener. The clamping main body includes a plurality of clamping monomers, and the plurality of clamping monomers are connected to form a clamping cavity for clamping the lead 3. The size and shape of the clamping cavity can be flexibly designed in combination with the actual structure of the lead 3, and no limitation is made here.

[0033] The plurality of clamping monomers are connected and fixed by a fastener. The fastener includes a fastening screw 1 and a fastening nut 2. At least one of the plurality of clamping monomers is provided with a limiting cavity 6 and a first connection cavity, and the other clamping monomers are provided with a second connection cavity. The plurality of clamping monomers can be connected by passing the fastening screw 1 through the first connection cavity and the second connection cavity. The fastening nut 2 is used to limit the lead 3 in the clamping cavity.

[0034] Optionally, the plurality of clamping monomers can be connected together first, then the lead 3 is passed through the clamping cavity, and then the fastening nut 2 is connected to the fastening screw 1 to limit the lead 3 in the clamping cavity; or the lead 3 can be placed first, then the plurality of clamping monomers are connected by the fastening screw 1, and finally the fastening nut 2 is connected to the fastening screw 1.

[0035] The inner walls of the first connection cavity and the second connection cavity are both connected to the fastening screw 1. This connection method is preferably a threaded connection. The plurality of clamping monomers can be connected by passing the fastening screw 1 through the first connection cavity and the second connection cavity.

[0036] The fastening nut 2 is arranged in the limiting cavity 6. After the fastening screw 1 passes through the first connection cavity and the second connection cavity, the fastening nut 2 is screwed onto the fastening screw 1 to press the clamping monomer, so as to limit the lead 3 in the clamping cavity and ensure the reliable stability of the lead 3 clamping.

[0037] The clamping body includes several clamping units. If there are two clamping units, a limiting cavity 6 can be provided on one clamping unit to place the fastening nut 2, and a connecting cavity can be provided on the other clamping unit; alternatively, limiting cavities 6 for placing the fastening nut 2 can be provided on both clamping units, and the lead 3 is limited in the limiting cavity 6 by fastening with two fastening nuts 2.

[0038] If there are three clamping units, a limiting cavity 6 and a first connecting cavity can be provided on one clamping unit, and the other two can be provided with second connecting cavities. When there are three or more clamping units, the number of fastening screws 1 can be set according to the actual situation to ensure the stable and reliable connection between the clamping units.

[0039] It should be noted that the number of limiting cavities 6 provided on one clamping unit can be determined according to actual needs, and one, two, or multiple limiting cavities 6 can be provided. Each limiting cavity 6 is equipped with a fastening nut 2.

[0040] When the fastening nut 2 is placed in the limiting cavity 6 to limit the lead 3 in the clamping cavity, the top surface of the fastening nut 2 is lower than or equal to the height of the top surface of the limiting cavity 6, so that the nut uses the space of the clamping unit itself for fastening, and will not protrude from the clamping unit after the nut is connected to the screw, and will not occupy the height space of the lead 3, improving the space utilization rate.

[0041] The above-mentioned lead clamping device includes a clamping body and a fastener. The clamping body includes several clamping units, and the several clamping units are connected by the fastener to form a clamping cavity for clamping the lead 3; the fastener includes a fastening screw 1 and a fastening nut 2. At least one of the several clamping units is provided with a limiting cavity 6 and a first connecting cavity, and a second connecting cavity is provided in other clamping units. The fastening screw 1 passes through the inner walls of the first connecting cavity and the second connecting cavity to connect the several clamping units, and the fastening nut 2 is provided in the limiting cavity 6 and connected to the fastening screw 1, so that the lead 3 is reliably clamped in the clamping cavity; when the fastening nut 2 is placed in the limiting cavity 6, the height of its top surface is lower than or equal to the height of the top surface of the limiting cavity 6. When the fastening nut 2 and the fastening screw 1 are used in cooperation, they will not protrude from the clamping body and will not occupy the height space of the lead 3, improving the utilization rate of the lead space and ensuring the reliability of lead clamping.

[0042] On the basis of the above embodiment, the fastening nut 2 is a trapezoidal nut, and the height of the trapezoidal nut is less than or equal to the height of the limiting cavity 6.

[0043] Please refer to Figure 1 、 Figure 2 、 Figure 4, The setting of the fastening nut 2 can, on the one hand, increase the contact area with the limiting cavity 6 of the clamping monomer, increase the friction force, prevent the nut from falling off, and avoid the situation where the lead wire 3 is not fastened; on the other hand, it can ensure the overall strength of the clamping device through the fastening nut 2 and improve the reliability of the clamping device.

[0044] Optionally, the fastening nut 2 can have a structure with a larger upper part and a smaller lower part, or a structure with a smaller upper part and a larger lower part.

[0045] Optionally, the outer periphery of the fastening nut 2 and the inner wall of the cavity of the limiting cavity 6 can be completely tightly fitted, or can be partially fitted.

[0046] The height of the trapezoidal nut is less than or equal to the height of the limiting cavity 6, so that after the nut is connected to the fastening screw rod 1, it will not protrude from the clamping monomer, will not occupy the height space of the lead wire 3, improve the utilization rate of the lead wire space, and meet the design requirements of miniaturization and light weight of the transformer.

[0047] Based on any of the above embodiments, the diameter of the end of the trapezoidal nut close to the limiting cavity 6 is larger than the diameter of the end far from the limiting cavity 6.

[0048] Please refer to Figure 2 、 Figure 3 、 Figure 4 , The trapezoidal nut has an overall structure with a larger upper part and a smaller lower part, which is convenient for operation to connect it to the fastening screw rod 1, and in this structure, the limiting cavity 6 has a better effect of supporting and limiting it, avoiding the nut from falling off and affecting the clamping stability of the lead wire 3, and improving the overall reliability of the clamping device.

[0049] Preferably, the acute angle in the trapezoidal cross-section of the trapezoidal nut is 60°, and it can also be flexibly changed according to the actual situation. While ensuring the strength of the trapezoidal nut, it is convenient to connect to the fastening screw rod 1 and increase the contact area with the limiting cavity 6, thereby improving the overall reliability of the clamping device.

[0050] Based on any of the above embodiments, the fastening nut 2 is provided with an operation hole 21 for facilitating the fastening of the operation tool, and a threaded hole 22 for threaded connection with the fastening screw rod 1.

[0051] Please refer to Figure 1 、 Figure 4 , One or more operation holes 21 can be set according to the tools used, mainly for facilitating the connection of the fastening nut 2 to the fastening screw rod 1. The specific form, size, etc. of the holes are not limited either, and can be flexibly designed according to the actual operation requirements.

[0052] The fastening nut 2 is also provided with a threaded hole 22. The threaded hole 22 is preferably arranged at the middle position of the fastening nut 2. The threaded hole 22 is threadedly connected to the outer periphery of the fastening screw rod 1. By screwing the fastening nut 2, the effect of clamping and fixing the lead wire 3 through the clamping monomer can be achieved.

[0053] Taking two clamping monomers, one is provided with a limiting cavity 6 and a first connecting cavity, and the other is provided with a second connecting cavity. After placing the lead wire 3 in the clamping cavity, the fastening screw 1 passes through the first connecting cavity and the second connecting cavity to initially limit the lead wire 3 in the clamping cavity, and then the fastening nut 2 is connected to the fastening screw 1 to further limit and fix the lead wire 3 in the clamping cavity, ensuring the reliable stability of the clamped lead wire 3.

[0054] On the basis of any of the above embodiments, the limiting cavity 6 has a conical counterbore, and the outer peripheral wall surface of the fastening nut 2 is arranged in fit with the inner wall surface of the conical counterbore.

[0055] In this embodiment, the limiting cavity 6 has a conical counterbore, and the conical counterbore cooperates with the trapezoidal structure of the fastening nut 2.

[0056] When the fastening nut 2 is connected to the fastening screw 1, turn the fastening nut 2 until its outer peripheral wall surface is completely in fit with the inner wall surface of the conical counterbore, and the top surface of the fastening nut 2 is lower than or flush with the top surface of the clamping monomer. At this time, the clamping monomers are firmly connected, the lead wire 3 is firmly clamped, and the nut is hidden in the limiting cavity 6, without occupying the height space of the lead wire 3, improving the space utilization rate.

[0057] Preferably,

[0058] On the basis of any of the above embodiments, the clamping body includes a first clamping monomer 4 and a second clamping monomer 5. The first clamping monomer 4 and the second clamping monomer 5 are arranged opposite to each other and both are provided with grooves, and the grooves of the two surround to form a clamping cavity.

[0059] Please refer to Figure 1 、 Figure 2 、 Figure 3 , the clamping body includes two clamping monomers, one above the other, specifically the first clamping monomer 4 and the second clamping monomer 5. Grooves are provided on both clamping monomers, and the grooves of the two surround to form a clamping cavity for placing the lead wire 3.

[0060] In a more preferred embodiment, a limiting cavity 6 and a first connecting cavity are provided on the first clamping monomer 4, a second connecting cavity is provided on the second clamping monomer 5. During use, the lead wire 3 can be first placed in the groove on the second clamping monomer 5, and then the first clamping monomer 4 is placed on the upper side of the second clamping monomer 5, so that the grooves of the two clamping monomers enclose to clamp the lead wire 3. Then, the fastening screw 1 passes through the first connecting cavity and the second connecting cavity to connect the two clamping monomers, forming a preliminary limit for the lead wire 3. Then, the fastening nut 2 is connected to the fastening screw 1, and the operating hole 21 is connected through an operating tool to turn the fastening nut 2 until the outer peripheral wall surface of the fastening nut 2 is completely attached to the inner wall surface of the tapered counterbore and the top surface of the fastening nut 2 is lower than or flush with the top surface of the clamping monomer. At this time, the lead wire 3 is re-fastened and limited to ensure the reliable stability of the clamped lead wire 3.

[0061] Based on any of the above embodiments, a limiting cavity 6 is provided on at least one of the first clamping monomer 4 and the second clamping monomer 5, and the limiting cavity 6 communicates with the first connecting cavity.

[0062] Either of the two clamping monomers can be provided with the limiting cavity 6, or both clamping monomers can be provided with the limiting cavity 6. The limiting cavity 6 is used in combination with the fastening nut 2 to ensure the reliable stability of the clamped lead wire 3. If it is more convenient to install on the upper side, the limiting cavity 6 is provided on the first clamping monomer 4 and the second clamping monomer 5 is not provided with the limiting cavity 6; if it is more convenient to install on the lower side, the limiting cavity 6 is provided on the second clamping monomer 5; if it is convenient to install on both the upper and lower sides and the lead wire 3 is reinforced and stable, such as when the lead wire 3 is heavy and thick, the limiting cavity 6 and the first connecting cavity are provided on both the first clamping monomer 4 and the second clamping monomer 5. In this case, there is no clamping monomer with only the second connecting cavity.

[0063] The limiting cavity 6 communicates with the first connecting cavity. Please refer to Figure 2 、 Figure 3 , the first connecting cavity and the limiting cavity 6 can also be understood as the upper and lower parts of a cavity. When the fastening nut 2 is not placed, the fastening screw 1 is threadedly connected to the first connecting cavity and the second connecting cavity. When the fastening nut 2 is placed, it is directly sleeved on the fastening screw 1, and then the fastening nut 2 is turned until its outer peripheral wall surface is completely attached to the wall surface of the limiting cavity 6. Here, when the outer peripheral wall surface of the fastening nut 2 is completely attached to the wall surface of the limiting cavity 6, it means that the top surface of the fastening nut 2 is lower than or flush with the top surface of the first clamping monomer 4.

[0064] Based on any of the above embodiments, a number of groups of fasteners are symmetrically provided on both sides of the clamping cavity.

[0065] Taking the example that there are two clamping monomers, the clamping cavity is arranged in the middle position of the clamping monomer, and several groups of fasteners are symmetrically arranged on both sides of the clamping cavity to fasten the clamping monomer, ensuring the overall stability and reliability of the clamping device and the reliable and stable clamping of the lead 3.

[0066] It should be noted that the number of fastening nuts 2 in the fasteners corresponds to the number of limiting cavities 6. On the premise of ensuring the overall stability, reliability and overall strength of the clamping device, two groups of fasteners can be set.

[0067] On the basis of any of the above embodiments, the fastening nut 2, the fastening screw 1 and the clamping body are all insulating components.

[0068] Making the fastening nut 2, the fastening screw 1 and the clamping body all insulating components ensures the safety of the operation.

[0069] In a more preferred manner, both the fastening nut 2 and the fastening screw 1 are made of epoxy resin glass fiber reinforced composite material to ensure the insulation strength and reliability; the clamping body is any one of fiber reinforced composite material, glass fiber reinforced composite material, carbon fiber reinforced composite material or aramid fiber reinforced composite material, high-density laminate material, ensuring the insulation strength and reliability.

[0070] In addition to the above lead clamping device, the present invention also provides a transformer structure including the lead clamping device disclosed in the above embodiment. For the structures of other parts of the transformer structure, please refer to the prior art and will not be elaborated herein. Through the setting of the lead clamping device, the overall transformer structure can meet the requirements of lightweight and miniaturization, and better meet the market.

[0071] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same and similar parts among the embodiments can be referred to each other.

[0072] The above has introduced in detail a lead clamping device and a transformer structure provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A lead clamping device, characterized in that: include: A clamping body, comprising a plurality of clamping monomers, wherein the plurality of clamping monomers are connected to form a clamping cavity for clamping a lead wire (3); A fastener comprising a fastening screw (1) and a fastening nut (2), wherein at least one of the plurality of clamping units is provided with a limiting cavity (6) and a first connecting cavity, and the other clamping units are provided with a second connecting cavity; The inner wall of the first connecting cavity and the inner wall of the second connecting cavity are both connected to the fastening screw (1) to form a connection of a plurality of the clamping units. The fastening nut (2) is arranged in the limiting cavity (6) and is connected to the fastening screw (1) to limit the lead wire (3) in the clamping cavity. When the fastening nut (2) is placed in the limiting cavity (6), its top surface is lower than or equal to the height of the top surface of the limiting cavity (6).

2. The lead clamping device according to claim 1, characterized in that: The fastening nut (2) is a trapezoidal nut, and the height of the trapezoidal nut is less than or equal to the height of the limiting cavity (6).

3. The lead clamping device according to claim 2, characterized in that: The diameter of the trapezoidal nut at one end close to the limiting cavity (6) is greater than the diameter of the trapezoidal nut at one end away from the limiting cavity (6).

4. The lead clamping device according to claim 3, characterized in that: The fastening nut (2) is provided with an operating hole (21) for facilitating fastening with an operating tool, and a threaded hole (22) for threaded connection with the fastening screw rod (1).

5. The lead clamping device according to claim 4, characterized in that: The limiting cavity (6) has a conical countersunk hole, and the outer peripheral wall surface of the fastening nut (2) is arranged to fit the inner wall of the conical countersunk hole.

6. The lead clamping device according to claim 1, characterized in that: The clamping body comprises a first clamping unit (4) and a second clamping unit (5), the first clamping unit (4) and the second clamping unit (5) being arranged opposite to each other and both being provided with a groove, the grooves of the two being combined to form the clamping cavity.

7. The lead clamping device according to claim 6, characterized in that: At least one of the first clamping unit (4) and the second clamping unit (5) is provided with the limiting cavity (6), and the limiting cavity (6) is communicated with the first connecting cavity.

8. The lead clamping device according to any one of claims 1 to 7, characterized in that: A plurality of groups of fasteners are symmetrically arranged on both sides of the clamping cavity.

9. The lead clamping device according to claim 8, characterized in that: The fastening nut (2), the fastening screw (1) and the clamping body are all insulating components.

10. A transformer structure, characterized in that: The lead clamping device comprises the lead clamping device according to any one of claims 1 to 9.

Images