relay

Abstract

The utility model relates to electric appliance technical field especially relates to a relay. The relay includes support, shell and contact, and the support is provided with first mounting hole. The shell is installed in the support, and the shell is provided with second mounting hole. The contact includes connecting piece and terminal block, and one end of connecting piece is connected with terminal block, and connecting piece is provided with third mounting hole. Connecting piece is installed in the support, and third mounting hole is communicated with first mounting hole and is connected through riveting, and terminal block extends second mounting hole. When connecting piece is installed in the support, third mounting hole is communicated with first mounting hole and is connected through riveting, so as to realize the riveting installation of contact and support, make part wiring force transmission of terminal block when wiring with external wiring harness reach the support, reduce the wiring force that terminal block exerts to shell, avoid the breakage of shell under the extrusion of excessive wiring force, improve the wiring capacity of contact and the protection to shell.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a relay. Background Technology

[0002] A thermal overload relay is a commonly used protective industrial control electrical appliance. When in use, a bimetallic strip is connected in series in the main circuit controlled by the thermal overload relay. It uses the principle of bending and deforming of the thermal element when heated to control the connection and disconnection of electrical equipment circuits, thereby achieving overload protection.

[0003] Existing thermal overload relays use thermosetting phenolic molding compound for their housings to reduce costs. The contacts are installed inside the support, and the limiting points on the housing where they mate with the contacts are relatively weak, making them unable to withstand significant external forces. When the contact terminal block is connected to an external wiring harness, the housing is easily damaged by the wiring force transmitted by the contacts. This limits the contact wiring torque to only about 1.5 times the national standard, failing to meet wiring requirements with higher torque specifications. Utility Model Content

[0004] The purpose of this invention is to provide a relay that improves the wiring capability of the contacts and prevents the housing from being damaged by the wiring force of the contacts.

[0005] To achieve this objective, the technical solution adopted by this utility model is as follows:

[0006] Relays, including:

[0007] The support is provided with a first mounting hole;

[0008] The housing is mounted on the support, and the housing is provided with a second mounting hole;

[0009] The contact includes a connecting piece and a terminal block. One end of the connecting piece is connected to the terminal block, and the connecting piece is provided with a third mounting hole. The connecting piece is installed on the support, and the third mounting hole communicates with the first mounting hole and is connected by riveting. The terminal block extends out of the second mounting hole.

[0010] As an optional solution, the support is provided with a receiving groove, and the inner bottom wall of the receiving groove is provided with the first mounting hole, and the connecting piece is limited and installed in the receiving groove.

[0011] As an optional solution, the connecting piece is provided with at least two of the third mounting holes at intervals, and the inner bottom wall of the receiving groove is provided with at least two of the first mounting holes at intervals.

[0012] At least two of the first mounting holes are connected to at least two of the third mounting holes in a one-to-one correspondence and are connected by riveting; or, the inner bottom wall of the receiving groove is further provided with a positioning post, and the third mounting holes that are not riveted to the first mounting holes are sleeved on the positioning post.

[0013] As an optional solution, the terminal block extends towards one side of the connecting piece and is provided with a boss; the outer shell is provided with a plurality of partitions, and a second mounting hole is provided between two adjacent partitions;

[0014] A reinforcing plate is provided circumferentially on the inner side of the second mounting hole, and the reinforcing plate is provided with a limiting groove communicating with the second mounting hole; the wiring board is located between two adjacent partitions, and the boss passes through the limiting groove; when the circumferential side of the boss abuts against the inner side of the limiting groove, the wiring board and the two adjacent partitions are spaced apart.

[0015] As an optional solution, the limiting groove is a U-shaped groove, and the opening of the U-shaped groove communicates with the second mounting hole.

[0016] As an optional feature, the thickness of the reinforcing plate is greater than the wall thickness of the second mounting hole, and the thickness of the reinforcing plate is 1mm-3mm.

[0017] As an optional solution, the outer side of the reinforcing plate facing the partition is coplanar with the outer side of the second mounting hole facing the partition.

[0018] As an optional solution, the terminal block is provided with a threaded hole that is threaded to the terminal stud, and the threaded hole passes through the terminal block and the boss.

[0019] As an optional feature, the height of the boss is 2mm-3mm.

[0020] Alternatively, the boss can be a frustum.

[0021] The beneficial effects of this utility model are as follows:

[0022] The relay proposed in this utility model has a third mounting hole that communicates with the first mounting hole and is connected by riveting when the connecting piece is installed on the support. This allows the contacts to be riveted to the support, so that some of the wiring force when the terminal block is connected to the external wiring harness is transferred to the support. This reduces the wiring force applied by the terminal block to the housing, prevents the housing from being damaged under excessive wiring force, and improves the wiring capability of the contacts and the protection of the housing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the assembly structure of the support and contact provided in an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the moving contact provided in an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the relay provided in an embodiment of the present utility model;

[0026] Figure 4 yes Figure 3 Enlarged view of the local structure at point A;

[0027] Figure 5 This is a partial structural schematic diagram of the outer shell provided in an embodiment of the present utility model.

[0028] The component names and labels in the diagram are as follows:

[0029] 1. Support; 11. First mounting hole; 12. Receiving groove; 13. Positioning post; 2. Housing; 21. Second mounting hole; 22. Partition plate; 23. Reinforcing plate; 231. Limiting groove; 3. Contact; 31. Connecting piece; 311. Third mounting hole; 32. Terminal block; 33. Boss; 4. Rivet; 5. Terminal stud. Detailed Implementation

[0030] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] This embodiment proposes a relay, which is a thermal relay. In use, a bimetallic strip is connected in series in the main circuit controlled by the thermal overload relay. It utilizes the principle of thermal element bending and deforming when heated to control the connection and disconnection of electrical equipment circuits, thereby achieving overload protection.

[0036] Existing thermal overload relays use thermosetting phenolic molding compound for their housings to reduce costs. The contacts are installed inside the support, and the limiting points on the housing where they mate with the contacts are relatively weak, making them unable to withstand significant external forces. When the contact terminal block is connected to an external wiring harness, the housing is easily damaged by the wiring force transmitted by the contacts. This limits the contact wiring torque to only about 1.5 times the national standard, failing to meet wiring requirements with higher torque specifications.

[0037] To solve the above problems, such as Figure 1 and Figure 2As shown, the relay in this embodiment includes a support 1, a housing 2, and a contact 3. The support 1 is provided with a first mounting hole 11. The housing 2 is mounted on the support 1 and is provided with a second mounting hole 21. The contact 3 includes a connecting piece 31 and a terminal block 32. One end of the connecting piece 31 is connected to the terminal block 32, and the connecting piece 31 is provided with a third mounting hole 311. The connecting piece 31 is mounted on the support 1, and the third mounting hole 311 communicates with the first mounting hole 11 and is connected by riveting. The terminal block 32 extends out of the second mounting hole 21. When the connecting piece 31 is mounted on the support 1, the third mounting hole 311 communicates with the first mounting hole 11 and is connected by riveting with a rivet 4 to achieve the riveting installation of the contact 3 and the support 1. This allows part of the wiring force when the terminal block 32 is connected to the external wiring harness to be transferred to the support 1, thereby reducing the wiring force applied by the terminal block 32 to the housing 2 and preventing the housing 2 from being damaged under excessive wiring force. This improves the wiring capability of the contact 3 and the protection of the housing 2.

[0038] like Figure 1 As shown, the support 1 is provided with a receiving groove 12, and the inner bottom wall of the receiving groove 12 is provided with a first mounting hole 11. The connecting piece 31 is limited and installed in the receiving groove 12. In this embodiment, there are four contacts 3, namely a normally open moving contact, a normally open stationary contact, a normally closed moving contact, and a normally closed stationary contact. The support 1 is provided with four receiving grooves 12, and the four contacts 3 are respectively limited and installed in the corresponding receiving grooves 12 to realize the limited installation of the contacts 3, improve the stability of the contact 3 installation, and at the same time, make the third mounting hole 311 of the connecting piece 31 quickly aligned with the first mounting hole 11 in the receiving groove 12, thereby improving the installation efficiency of the contacts 3.

[0039] In one embodiment, the connecting piece 31 is provided with at least two third mounting holes 311 spaced apart, and the inner bottom wall of the receiving groove 12 is provided with at least two first mounting holes 11 spaced apart. The at least two first mounting holes 11 and the at least two third mounting holes 311 are connected in a one-to-one correspondence and are riveted together. This arrangement allows the connecting piece 31 to be riveted to the support 1 by multiple rivets 4, improving the stability of the connecting piece 31 during installation on the support 1 and enabling the support 1 to withstand more wiring forces.

[0040] In other alternative embodiments, the inner bottom wall of the receiving groove 12 is also provided with a positioning post 13, and the third mounting hole 311, which is not riveted to the first mounting hole 11, is sleeved on the positioning post 13. That is, part of the third mounting hole 311 is riveted to the first mounting hole 11 by rivets 4, and the other part of the third mounting hole 311 is sleeved on the positioning post 13, so that the contact 3 is installed in the receiving groove 12 of the support 1 by riveting and hole-shaft cooperation respectively, so as to adjust the installation method of the connecting piece 31 according to the different structures of the support 1, and realize the flexible installation of the contact 3.

[0041] like Figure 1 and Figure 2As shown, in this embodiment, the connecting piece 31 of the normally open moving contact (or normally closed moving contact) is provided with three third mounting holes 311 spaced apart. The corresponding receiving groove 12 of the support 1 is provided with two first mounting holes 11 and one positioning post 13. Two of the first mounting holes 11 are riveted to their corresponding third mounting holes 311 by rivets 4, and the other third mounting hole 311 is fitted onto the positioning post 13. The connecting piece 31 of the normally open stationary contact (or normally closed stationary contact) is provided with two third mounting holes 311 spaced apart. The corresponding receiving groove 12 of the support 1 is provided with one first mounting hole 11 and one positioning post 13. The first mounting hole 11 is riveted to its corresponding third mounting hole 311 by rivets 4, and the other third mounting hole 311 is fitted onto the positioning post 13. It can be understood that the number, distribution, and installation method of the third mounting holes 311 of each contact 3 can be flexibly adjusted according to the installation requirements of the contact 3, as long as each contact 3 is riveted to the support 1 by at least one rivet 4.

[0042] like Figure 3 and Figure 4 As shown, the outer casing 2 has multiple partitions 22 protruding from it, and a second mounting hole 21 is provided between two adjacent partitions 22. The partitions 22 are mainly used to achieve electrical isolation during wiring, avoiding short circuits caused by contact between adjacent contacts 3 or wire harnesses, thus improving the safety of relay wiring. Since the partitions 22 are integrally formed with the outer casing 2 and the thickness of the partitions 22 is relatively thin, the terminal block 32 is provided with threaded holes for threaded connection with the terminal studs 5. The terminal studs 5 are loosely installed in the threaded holes, and the terminal studs 5 are fitted with pressure plates, which are stacked on the terminal block 32. When the wire lug of the wire harness extends between the terminal block 32 and the pressure plate of the contact 3, the pressure plate and the terminal block 32 are pressed together by tightening the terminal studs 5, thereby clamping the wire lug between the terminal block 32 and the pressure plate, realizing a reliable electrical connection between the wire harness and the terminal block 32.

[0043] It should be noted that when the terminal block 5 is tightened, the terminal block 32 will shake or shift, which will cause the terminal block 32 to press against one or two adjacent partitions 22 under the action of the wiring force after the terminal block 5 is tightened. This will squeeze the partitions 22, causing them to tilt or break, thereby damaging the outer shell 2.

[0044] To prevent the terminal block 32 from coming into contact with the partition 22 during wiring, such as Figures 2-4As shown, a boss 33 extends from the side of the terminal block 32 toward the connecting piece 31. A reinforcing plate 23 is provided circumferentially on the inner side of the second mounting hole 21, and the reinforcing plate 23 is provided with a limiting groove 231 communicating with the second mounting hole 21. The terminal block 32 is located between two adjacent partitions 22, and the boss 33 passes through the limiting groove 231. When the circumferential side of the boss 33 abuts against the inner side of the limiting groove 231, the terminal block 32 is spaced apart from the two adjacent partitions 22. By providing a boss 33 on the terminal block 32 and a reinforcing plate 23 in the second mounting hole 21, during the tightening of the terminal stud 5, the circumferential side of the boss 33 abuts against the inner side of the limiting groove 231 of the reinforcing plate 23 first, thereby limiting the swing range or displacement distance of the terminal block 32, preventing the terminal block 32 from contacting the adjacent partitions 22, cutting off the transmission path of the wiring force to the partitions 22, and achieving protection for the partitions 22. In addition, the boss 33 and the reinforcing plate 23 are tightly pressed together, that is, the wiring force is mainly applied to the reinforcing plate 23 after being offset by the riveting structure between the connecting piece 31 and the support 1. This greatly reduces the squeezing of the second mounting hole 21, avoids the second mounting hole 21 from being damaged due to excessive squeezing force, and further improves the protection of the outer shell 2.

[0045] In this embodiment, the threaded hole penetrates the terminal block 32 and the boss 33, allowing the terminal stud 5 to pass through the terminal block 32 and extend into the boss 33 and be threadedly connected to the boss 33. This increases the axial length of the threaded hole, thereby increasing the contact area with the terminal stud 5 and improving the connection strength and stability between the terminal stud 5 and the threaded hole.

[0046] Furthermore, the height of the boss 33 is 2mm-3mm. Specifically, the height of the boss 33 can be 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, or 3mm, etc., to ensure that the boss 33 has a suitable height and guarantees that the threaded hole has a certain axial length. If the height of the boss 33 is too small, the axial length of the threaded hole will be too small, which is not conducive to the reliable connection of the wiring stud 5; if the height of the boss 33 is too large, it will increase the overall weight of the contact 3 and the installation space, and may easily interfere with the housing 2 or the support 1 during contact 3 installation.

[0047] It should be noted that the boss 33 is a frustum. In this embodiment, the boss 33 is integrally formed with the terminal block 32. Setting the boss 33 as a frustum facilitates the forming and processing of the boss 33, thereby reducing the processing difficulty and cost of the contact 3. Of course, in other embodiments, the circumferential outer edge of the boss 33 can also be square or other shapes, which are not specifically limited here.

[0048] like Figure 4 and Figure 5As shown, the limiting groove 231 is a U-shaped groove, and the opening of the U-shaped groove communicates with the second mounting hole 21. By setting the limiting groove 231 in a U-shape, it is convenient for the boss 33 to quickly enter or quickly detach from the reinforcing plate 23 through the opening of the limiting groove 231, which helps to improve the installation efficiency of the contact 3. It should be noted that in this embodiment, the reinforcing plate 23 is only provided in the second mounting hole 21 where the two moving contacts 3 are located.

[0049] Specifically, the thickness of the reinforcing plate 23 is greater than the wall thickness of the second mounting hole 21, and the thickness of the reinforcing plate 23 is 1mm-3mm. Because the wall thickness of the reinforcing plate 23 is greater than that of the second mounting hole 21, the reinforcing plate 23 can withstand greater wiring force without being crushed, improving the protection of the housing 2 and enhancing the wiring capability of the contacts 3 to meet the wiring requirements of the relay with higher wiring torque. The specific thickness of the reinforcing plate 23 can be 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, or 3mm, etc., to ensure that the reinforcing plate 23 has a suitable thickness, guaranteeing its structural strength and load-bearing capacity. If the wall thickness of the reinforcing plate 23 is too small, its structural strength will decrease, making it prone to damage under wiring force; if the wall thickness of the reinforcing plate 23 is too large, its weight and material usage will increase, increasing the total weight and cost of the housing 2.

[0050] It should be noted that the outer side of the reinforcing plate 23 facing the partition 22 is coplanar with the outer side of the second mounting hole 21 facing the partition 22. This arrangement simplifies the structure of the injection mold for the outer shell 2, facilitates the integral molding of the outer shell 2 through injection molding, and improves the aesthetics of the outer shell 2.

[0051] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A relay, characterized in that, include: Support (1), the support (1) is provided with a first mounting hole (11); The outer casing (2) is mounted on the support (1) and the outer casing (2) is provided with a second mounting hole (21). The contact (3) includes a connecting piece (31) and a terminal block (32). One end of the connecting piece (31) is connected to the terminal block (32). The connecting piece (31) is provided with a third mounting hole (311). The connecting piece (31) is installed on the support (1). The third mounting hole (311) is connected to the first mounting hole (11) by riveting. The terminal block (32) extends out of the second mounting hole (21).

2. The relay according to claim 1, characterized in that, The support (1) is provided with a receiving groove (12), and the inner bottom wall of the receiving groove (12) is provided with the first mounting hole (11). The connecting piece (31) is limited and installed in the receiving groove (12).

3. The relay according to claim 2, characterized in that, The connecting piece (31) is provided with at least two of the third mounting holes (311) at intervals, and the inner bottom wall of the receiving groove (12) is provided with at least two of the first mounting holes (11) at intervals. At least two of the first mounting holes (11) are connected to at least two of the third mounting holes (311) in a one-to-one correspondence and are connected by riveting; or, the inner bottom wall of the receiving groove (12) is also provided with a positioning post (13), and the third mounting hole (311) that is not riveted to the first mounting hole (11) is sleeved on the positioning post (13).

4. The relay according to any one of claims 1-3, characterized in that, The terminal block (32) has a boss (33) extending toward the side of the connecting piece (31); the outer shell (2) has a plurality of partitions (22) protruding, and a second mounting hole (21) is provided between two adjacent partitions (22); A reinforcing plate (23) is provided on the inner side of the second mounting hole (21) along the circumferential direction. The reinforcing plate (23) is provided with a limiting groove (231) communicating with the second mounting hole (21). The wiring board (32) is located between two adjacent partitions (22). The boss (33) passes through the limiting groove (231). When the circumferential side of the boss (33) abuts against the inner side of the limiting groove (231), the wiring board (32) is spaced apart from the two adjacent partitions (22).

5. The relay according to claim 4, characterized in that, The limiting groove (231) is a U-shaped groove, and the opening of the U-shaped groove is connected to the second mounting hole (21).

6. The relay according to claim 4, characterized in that, The thickness of the reinforcing plate (23) is greater than the wall thickness of the second mounting hole (21), and the thickness of the reinforcing plate (23) is 1mm-3mm.

7. The relay according to claim 4, characterized in that, The outer side of the reinforcing plate (23) facing the partition (22) is coplanar with the outer side of the second mounting hole (21) facing the partition (22).

8. The relay according to claim 4, characterized in that, The terminal block (32) is provided with a threaded hole that is threadedly connected to the terminal stud (5), and the threaded hole passes through the terminal block (32) and the boss (33).

9. The relay according to claim 8, characterized in that, The height of the boss (33) is 2mm-3mm.

10. The relay according to claim 4, characterized in that, The boss (33) is a frustum.

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