Load terminal and high-voltage direct-current relay

Abstract

The load terminal comprises a leading-out end and a connecting piece used for being connected with an external structure, the end face of the leading-out end is provided with a containing groove used for installing the connecting piece, and at least part of the connecting piece is embedded into the containing groove. And a pressing block fixedly connected with the leading-out end is used for preventing and limiting the part, embedded into the accommodating groove, of the connecting piece, so that the connecting piece and the leading-out end are fixedly connected together, the pressing block is embedded into the accommodating groove, and the end surface of the pressing block is configured to be not higher than the end surface of the leading-out end. According to the utility model, the pressing block is integrally embedded into the accommodating groove of the leading-out end, and the end face of the pressing block is configured to be not higher than the end face of the leading-out end, so that when the load terminal is connected with an external copper bar, the copper bar can be directly pressed against the end face of the leading-out end, and therefore, the copper bar can be stably fixed on the leading-out end without being influenced by the pressing block.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a load terminal and a high-voltage direct current relay. Background Art

[0002] A relay is an electronic control device that is commonly used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic regulation, safety protection, and circuit conversion in the circuit. A high-voltage DC relay is a type of relay. The load terminal of an existing high-voltage DC relay includes a lead-out terminal and a connecting terminal with a stud structure. The connecting terminal is fixedly connected to the lead-out terminal by the clamping and limiting effect generated by a pressure block welded to the end face of the lead-out terminal. The external copper busbar is then connected to the connecting terminal and abutted against the pressure block. In this way, the pressure block needs to have sufficient abutment area to ensure that the copper busbar is installed firmly and stably. Otherwise, the copper busbar may have poor connection stability with the load terminal due to insufficient abutment area of the pressure block. There may even be defects such as poor contact and large temperature rise at the contact position. However, increasing the contact area between the pressure block and the copper busbar will inevitably increase the amount of material used for the pressure block, which is not conducive to reducing production costs. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the utility model provides a load terminal, in which the pressure block is integrally embedded in the accommodating groove of the lead-out terminal, and the end face of the pressure block is configured to be no higher than the end face of the lead-out terminal, so that when the load terminal is connected to the copper busbar, the copper busbar can directly abut against the end face of the lead-out terminal.

[0004] To achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0005] A load terminal comprises a lead-out terminal and a connector for connecting to an external structure. A receiving groove for mounting the connector is provided at the end face of the lead-out terminal. The connector is at least partially embedded in the receiving groove, and a pressure block fixedly connected to the lead-out terminal serves to prevent the portion of the connector embedded in the receiving groove from falling out, thereby fixing the connector and the lead-out terminal together. The pressure block is embedded in the receiving groove, and the end face of the pressure block is configured to be no higher than the end face of the lead-out terminal.

[0006] Furthermore, the accommodating groove is a stepped groove hole structure, which has a large hole section and a small hole section arranged up and down, and a step surface is formed at the intersection of the large hole section and the small hole section. The pressure block is embedded and fixed in the large hole section of the accommodating groove and forms a pressing and anti-slip limiting effect on the connecting part.

[0007] Furthermore, the hardness of the connector is greater than the hardness of the lead-out end; preferably, the pressing block is a copper pressing block, the lead-out end is an oxygen-free copper lead-out end, and the connector is a diffused copper connector or a stainless steel connector.

[0008] Furthermore, the connecting piece is a brace with an internal threaded hole, a brace flange is formed on the upper end of the brace, the brace is completely embedded in the accommodating groove, and the brace flange abuts against the step surface of the accommodating groove, and the pressure block is fixedly connected to the lead-out end and pressed against the brace flange.

[0009] Furthermore, the outer diameter of the toothed sleeve flange is adapted to the aperture of the large hole section of the accommodating groove, and the sum of the thickness of the toothed sleeve flange and the pressing block after superposition is equal to the depth of the large hole section of the accommodating groove.

[0010] Furthermore, the pressing block and the tooth cap are fixedly connected in the receiving groove by brazing;

[0011] Furthermore, the hardness of the brace is greater than the hardness of the lead end;

[0012] Furthermore, the braces are made of dispersed copper or stainless steel.

[0013] Furthermore, the outer diameter of the pressing block is adapted to the aperture of the large hole section of the accommodating groove, and the peripheral side wall of the pressing block and the inner wall of the large hole section as well as the pressing block and the pressing fitting surface of the brace flange are all brazed and fixed together.

[0014] Furthermore, the connecting piece is a stud, and a stud flange is formed at the lower end of the stud. The thickness of the stud flange is adapted to the depth of the small hole section of the accommodating groove. The stud flange is adaptively embedded and fixed in the small hole section. The pressure block is configured to be fixedly connected to the lead-out end and to produce a pressing and anti-disengagement limiting effect on the stud flange placed in the small hole section, so that the stud is fixedly connected to the lead-out end.

[0015] Furthermore, the pressing block is fixedly connected to the large hole section of the accommodating groove by brazing, and the stud flange is fixedly connected to the small hole section of the accommodating groove by brazing;

[0016] Furthermore, the hardness of the stud is greater than the hardness of the lead end;

[0017] Furthermore, the stud is a dispersed copper stud or a stainless steel stud.

[0018] Furthermore, the thickness of the pressing block is adapted to the depth of the large hole section of the accommodating groove, the outer diameter of the pressing block is adapted to the aperture of the large hole section of the accommodating groove, and the peripheral side wall of the pressing block and the inner wall of the large hole section of the accommodating groove, the bottom surface of the pressing block and the step surface of the accommodating groove, and the pressing block and the press-fit surface of the stud flange are all brazed and fixed together.

[0019] Based on the same inventive concept, the present invention also provides a high-voltage DC relay comprising any of the above-mentioned load terminals.

[0020] The above technical solution has the following advantages or beneficial effects:

[0021] In the load terminal and high-voltage DC relay described in the present invention, a pressure block for preventing the connector from falling off and limiting the position is embedded in the receiving groove of the lead-out terminal, and the end face of the pressure block is configured to be no higher than the end face of the lead-out terminal. When the load terminal is connected to an external copper busbar, on the one hand, the copper busbar can be directly pressed against the end face of the lead-out terminal. In this way, the copper busbar can be firmly fixed to the lead-out terminal without being affected by the pressure block. On the other hand, the pressure block does not need to increase the amount of material used to ensure sufficient contact area with the copper busbar, as in the prior art, thereby helping to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the load terminal of the first embodiment of the present utility model.

[0023] Figure 2 It is a structural cross-sectional view of the load terminal of the first embodiment of the present utility model.

[0024] Figure 3 It is a structural cross-sectional view of the lead-out end of the first embodiment of the present utility model.

[0025] Figure 4 This is a schematic diagram of the assembly structure of the load terminal and the copper busbar in the first embodiment of the present utility model.

[0026] Figure 5 It is a partial structural diagram of the high-voltage direct relay of the first embodiment of the present utility model.

[0027] Figure 6 This is a partial structural cross-sectional view of the high-voltage direct relay of Example 1 of the present utility model.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the load terminal of the second embodiment of the present utility model.

[0029] Figure 8 This is a structural cross-sectional view of the load terminal of the second embodiment of the present utility model.

[0030] Figure 9 This is a structural cross-sectional view of the lead-out end of the second embodiment of the present utility model.

[0031] Description of labels:

[0032] 1. Lead-out terminal, 2. Pressure block, 3. Socket, 4. Stud, 5. Copper busbar, 6. Bolt, 11. Receiving groove, 31. Socket flange, 41. Stud flange, 111. Large hole section, 112. Small hole section, 113. Step surface. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0035] Example 1

[0036] Please refer to the attached Figure 1 To the attached Figure 6 An embodiment of the present invention provides a load terminal, including a lead-out terminal 1 and a connector for connecting to an external copper busbar 5. A receiving groove 11 for installing the connector is opened at the end surface of the lead-out terminal 1. The connector is at least partially embedded in the receiving groove 11, and a pressure block 2 fixedly connected to the lead-out terminal 1 is used to prevent the part of the connector embedded in the receiving groove 11 from falling off and limiting the position, thereby fixing the connector to the lead-out terminal 1. The pressure block 2 is embedded in the receiving groove 11, and the end surface of the pressure block 2 is configured to be no higher than the end surface of the lead-out terminal 1. It can be understood that, in this embodiment, the pressure block 2 for preventing the connector from falling off and limiting the position is embedded in the accommodating groove 11 of the lead-out terminal 1, and the end face of the pressure block 2 is configured to be no higher than the end face of the lead-out terminal 1. When the load terminal is connected to the external copper busbar 5, on the one hand, the copper busbar 5 can be directly pressed against the end face of the lead-out terminal 1. In this way, the copper busbar 5 can be firmly fixed on the lead-out terminal without being affected by the pressure block 2. On the other hand, the pressure block 2 does not need to increase the amount of material used to ensure sufficient contact area with the copper busbar 5 as in the prior art, which is conducive to reducing costs.

[0037] Please refer to the attached Figure 1 To the attached Figure 4 In one preferred embodiment, the accommodating groove 11 is a stepped slot structure having a large hole section 111 and a small hole section 112 arranged up and down, and a step surface 113 is formed at the intersection of the large hole section 111 and the small hole section 112. The pressing block 2 is embedded and fixed in the large hole section 111 of the accommodating groove 11 and forms a pressing and anti-slip limiting effect on the connecting piece.

[0038] Please refer to the attached Figure 1 To the attached Figure 4In one preferred embodiment, the outer diameter of the toothed brace flange 31 is adapted to the aperture of the large hole section 111 of the receiving groove 11, and the sum of the thickness of the toothed brace flange 31 and the pressure block 2 after being overlapped is equal to the depth of the large hole section 111 of the receiving groove 11. Preferably, the pressure block 2 and the toothed brace 3 are both fixedly connected to the receiving groove 11 by brazing; in this embodiment, preferably, the outer diameter of the pressure block 2 is adapted to the aperture of the large hole section 111 of the receiving groove 11, and the peripheral side wall of the pressure block 2 and the inner wall of the large hole section 111, as well as the pressure-fitting surfaces between the pressure block 2 and the toothed brace flange 31, are all fixedly connected by brazing.

[0039] Please refer to the attached Figure 1 To the attached Figure 4 In one preferred embodiment, the hardness of the brace 3 is greater than the hardness of the lead-out terminal 1; in this embodiment, preferably, the pressure block 2 is a copper pressure block, the lead-out terminal 1 is an oxygen-free copper lead-out terminal, and the brace 3 is a dispersed copper brace or a stainless steel brace. However, those skilled in the art should understand that in other embodiments, the material of the brace 3 can also be made of other materials with a greater hardness than the lead-out terminal 1, and is not limited to the specific implementation method disclosed in this embodiment. In this embodiment, the hardness of the brace 3 is greater than the hardness of the lead-out terminal 1, which can avoid the occurrence of slipping when the load terminal is threadedly connected to the external structure, which is beneficial to improving its connection reliability.

[0040] Please refer to the attached Figure 1 To the attached Figure 4 In one preferred embodiment, the connecting member is a brace 3 with an internal threaded hole formed therein, a brace flange 31 is formed on the upper end of the brace 3, the brace 3 is completely embedded in the receiving groove 11, and the brace flange 31 abuts on the step surface 113 of the receiving groove 11, and the pressing block 2 is fixedly connected to the lead-out end 1 and pressed against the brace flange 31. In this embodiment, by providing the brace flange 31 on the brace 3, on the one hand, the contact area between the brace 3 and the inner wall of the receiving groove 11 can be increased, thereby improving the welding stability of the brace 3 inside the receiving groove 11; on the other hand, the brace flange 31 is used to increase the abutment area between the pressing block 2 and the brace 3, thereby facilitating the improvement of the pressing and anti-disengagement limiting effect of the pressing block 2 on the brace 3, and further improving the assembly stability of the brace 3 in the receiving groove 11 of the brace 3. In this embodiment, when the load terminal is connected to the copper busbar 5, bolts 6, gaskets, spring washers and other structures are first installed on the copper busbar 5, and then the copper busbar 5 is locked and fixed to the end face of the lead-out terminal 1 by utilizing the threaded fit between the bolts 6 and the internal threaded hole of the socket 3.

[0041] Please refer to the attached Figure 1 To the attached Figure 6 An embodiment of the present invention further provides a high-voltage DC relay, comprising the load terminal of any of the above embodiments.

[0042] Example 2

[0043] Please refer to the attached Figure 7 To the attached Figure 9 The difference between this embodiment and the first embodiment is that the connecting member is a stud 4, and a stud flange 41 is formed at the lower end of the stud 4. The thickness of the stud flange 41 is adapted to the depth of the small hole section 112 of the accommodating groove 11. The stud flange 41 is adaptively embedded and fixed in the small hole section 112. The pressure block 2 is configured to be brazed and fixedly connected to the lead-out terminal 1 and to produce a compression and anti-disengagement limiting effect on the stud flange 41 located in the small hole section 112, thereby firmly connecting the stud 4 to the lead-out terminal 1. When in use, the copper busbar is first inserted into the stud 4, and then a gasket, spring washer, etc. are inserted into the stud 4. Finally, the copper busbar is locked to the end face of the lead-out terminal 1 using a nut screwed onto the stud 4.

[0044] Please refer to the attached Figure 7 To the attached Figure 9 In one preferred embodiment, the pressing block 2 is fixedly connected to the large hole section 111 of the accommodating groove 11 by brazing, and the stud flange 41 is fixedly connected to the small hole section 112 of the accommodating groove 11 by brazing; preferably, the thickness of the pressing block 2 is adapted to the depth of the large hole section 111 of the accommodating groove 11, the outer diameter of the pressing block 2 is adapted to the aperture of the large hole section 111 of the accommodating groove 11, and the circumferential side wall of the pressing block 2 and the inner wall of the large hole section 111 of the accommodating groove 11, the bottom surface of the pressing block 2 and the step surface 113 of the accommodating groove 11, and the pressing block 2 and the press-fit surface of the stud flange 41 are all brazed and fixed together. In this embodiment, since the peripheral side walls of the pressing block 2 and the inner wall of the large hole section 111 of the accommodating groove 11, as well as the bottom surface of the pressing block 2 and the step surface 113 of the accommodating groove 11 are brazed and fixed together, compared with the existing structure in which the pressing block is directly welded and fixed to the end face of the lead-out terminal, it has a larger welding area with the lead-out terminal. In this way, the welding firmness between the pressing block 2 and the lead-out terminal 1 can be effectively improved, which is beneficial to improving the connection stability between the stud 4 and the lead-out terminal 1.

[0045] Please refer to the attached Figure 7 To the attached Figure 9 In one preferred embodiment, the hardness of the stud 4 is greater than the hardness of the lead-out terminal 1; preferably, the pressure block 2 is a copper pressure block, the lead-out terminal 1 is an oxygen-free copper lead-out terminal, and the stud 4 is a dispersed copper stud or a stainless steel stud. However, those skilled in the art should understand that in other embodiments, the material of the stud 4 can also be made of other materials with a greater hardness than the lead-out terminal 1, and is not limited to the specific implementation method disclosed in this embodiment. In this embodiment, the hardness of the stud 4 is greater than the hardness of the lead-out terminal 1, which can avoid the occurrence of slipping when the load terminal is threadedly connected to the external structure, which is beneficial to improving its connection reliability.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present invention.

Claims

1. A load terminal, characterized in that: The invention comprises a lead-out terminal (1) and a connector for connecting to an external structure. A receiving groove (11) for installing the connector is provided at the end surface of the lead-out terminal (1). The connector is at least partially embedded in the receiving groove (11). A pressing block (2) fixedly connected to the lead-out terminal (1) plays an anti-dropout and limiting role on the portion of the connector embedded in the receiving groove (11), thereby making the connector and the lead-out terminal (1) fixedly connected together. The pressing block (2) is embedded in the receiving groove (11), and the end surface of the pressing block (2) is configured to be no higher than the end surface of the lead-out terminal (1).

2. The load terminal according to claim 1, wherein: The accommodating groove (11) is a stepped groove hole structure, which has a large hole section (111) and a small hole section (112) arranged up and down, and a stepped surface (113) is formed at the intersection of the large hole section (111) and the small hole section (112). The pressing block (2) is embedded and fixed in the large hole section (111) of the accommodating groove (11) and forms a pressing and anti-slip limiting effect on the connecting piece.

3. The load terminal according to claim 2, wherein: The hardness of the connector is greater than the hardness of the lead end (1), and / or the pressing block is a copper pressing block, the lead end (1) is an oxygen-free copper lead end, and the connector is a diffused copper connector or a stainless steel connector.

4. The load terminal according to claim 3, wherein: The connecting piece is a toothed sleeve (3) with an internal threaded hole formed therein, a toothed sleeve flange (31) is formed on the upper end of the toothed sleeve (3), the toothed sleeve (3) is completely embedded in the receiving groove (11), and the toothed sleeve flange (31) abuts against the step surface (113) of the receiving groove (11), and the pressing block (2) is fixedly connected to the lead-out end (1) and pressed against the toothed sleeve flange (31).

5. The load terminal according to claim 4, wherein: The outer diameter of the toothed brace flange (31) is adapted to the aperture of the large hole section (111) of the accommodating groove (11), and the sum of the thickness of the toothed brace flange (31) and the pressing block (2) after being superimposed is equal to the depth of the large hole section (111) of the accommodating groove (11).

6. The load terminal according to claim 4 or 5, characterized in that: The pressing block (2) and the toothed sleeve (3) are both fixedly connected in the accommodating groove (11) by brazing.

7. The load terminal according to claim 6, wherein: The outer diameter of the pressing block (2) is adapted to the aperture of the large hole section (111) of the accommodating groove (11), and the peripheral side wall of the pressing block (2) and the inner wall of the large hole section (111) as well as the pressing block (2) and the pressure-fitting surface of the toothed sleeve flange (31) are all brazed and fixedly connected together.

8. The load terminal according to claim 3, wherein: The connecting piece is a stud (4), and a stud flange (41) is formed at the lower end of the stud (4). The thickness of the stud flange (41) is adapted to the depth of the small hole section (112) of the accommodating groove (11). The stud flange (41) is adaptively embedded and fixed in the small hole section (112). The pressing block (2) is configured to be fixedly connected to the lead-out end (1) and to produce a pressing and anti-slip limiting effect on the stud flange (41) placed in the small hole section (112), so that the stud (4) and the lead-out end (1) are fixedly connected together.

9. The load terminal according to claim 8, wherein: The pressing block (2) is fixedly connected to the large hole section (111) of the accommodating groove (11) by brazing, and the stud flange (41) is fixedly connected to the small hole section (112) of the accommodating groove (11) by brazing. The thickness of the pressing block (2) is adapted to the depth of the large hole section (111) of the accommodating groove (11), the outer diameter of the pressing block (2) is adapted to the aperture of the large hole section (111) of the accommodating groove (11), and the peripheral side wall of the pressing block (2) and the inner wall of the large hole section (111) of the accommodating groove (11), the bottom surface of the pressing block (2) and the step surface (113) of the accommodating groove (11), and the pressing block (2) and the press-fit surface of the stud flange (41) are all fixedly connected together by brazing.

10. A high voltage DC relay, characterized in that: The load terminal comprises the load terminal according to any one of claims 1 to 9.

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