Electromagnetic relay

Abstract

The invention provides an electromagnetic relay which comprises a shell and a relay body assembled on the shell, the relay body is provided with a load leading-out end, a nut is embedded in the shell, the load leading-out end is provided with a receding hole corresponding to a screw hole of the nut, and the aperture of the receding hole is larger than that of the screw hole of the nut. On a projection plane perpendicular to the axial direction, a screw hole of the nut is located in the receding hole, and the screw hole and the hole wall of the receding hole are arranged at an interval; when a client side carries out installation operation, the rod portion of the bolt sequentially penetrates through the receding holes of the load end and the load leading-out end and is screwed and locked with the nut in the shell, in the process, the rod portion of the bolt does not make contact with the load leading-out end, and therefore stress is prevented from being applied to the load leading-out end. And the structural stability of the load leading-out end and the reliability of the electromagnetic relay are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to an electromagnetic relay. BACKGROUND

[0002] The electromagnetic relay is an electronic control device, which has a control system (also known as an input loop) and a controlled system (also known as an output loop), and is usually applied in an automatic control circuit. It is actually a kind of "automatic switch" that uses a small current and low voltage to control a large current and high voltage. Therefore, it plays a role in automatic adjustment, safety protection, and circuit conversion in the circuit.

[0003] In order to facilitate the connection with the external load, the electromagnetic relay is provided with a load leading-out end. A lock hole is usually formed in the load leading-out end. When the customer installs and operates, the bolt is passed through the lock hole of the load leading-out end and is locked with the load end (for example, the load leading-out end and the load end are locked by the cooperation of the bolt and the nut). The prior art has the following problems: 1. When the electromagnetic relay is installed, the locking force (the force generated during installation, which is very large; there is no such force after installation is completed) of the bolt and the nut is mainly the circumferential rotation force, and there may also be a small part of the axial positive and negative direction force. This part of the force is transmitted to the load leading-out end, which is easy to cause the load leading-out end to loosen, thereby causing the internal mechanical parameters to change, and even eventually leading to the failure of the relay.

[0004] 2. After the installation is completed, the external wire (especially the large current wire with a large cross-sectional area) applies stress to the electromagnetic relay for a long time. This stress may include axial direction, radial direction and / or circumferential direction stress. If this force cannot be well offset, the long-term application of the force on the relay leading-out end will cause the relay to fail. SUMMARY

[0005] Therefore, the present application provides an electromagnetic relay to solve the above problems.

[0006] To achieve the above purpose, the technical scheme provided by the present application is as follows: An electromagnetic relay, comprising a shell and a relay main body assembled on the shell, the relay main body having a load leading-out end, the shell being embedded with a nut, the load leading-out end having a clearance hole corresponding to the screw hole of the nut, the hole diameter of the clearance hole being larger than the hole diameter of the screw hole of the nut, and in the projection plane perpendicular to the axial direction, the screw hole of the nut is located in the clearance hole and is arranged at a distance from the hole wall of the clearance hole; the outer circumferential side of the nut has a protruding portion extending radially outward, and the protruding portion is also embedded in the shell.

[0007] Further, the clearance hole of the load leading-out end and the screw hole of the nut are coaxially arranged.

[0008] Further, the clearance hole of the load leading end is a round hole or a square hole.

[0009] Further, the shell is a plastic shell.

[0010] Further, the nut is embedded in the shell by injection molding.

[0011] Further, the nut is embedded in the shell by assembly.

[0012] Further, the outer end surface of the nut is exposed on the surface of the shell.

[0013] Further, the outer end surface of the nut is flush with the surface of the shell.

[0014] Further, the outer peripheral surface of the nut is a non-circular shape.

[0015] Further, the nut is a hexagonal nut.

[0016] The technical scheme provided by the present application has the following beneficial effects: The nut is embedded in the shell of the electromagnetic relay, and the clearance hole corresponding to the screw hole of the nut is arranged on the load leading end, and the hole diameter of the screw hole of the nut is smaller than the clearance hole and is inside the clearance hole. Therefore, when the customer installs the bolt, the rod of the bolt is sequentially inserted through the clearance holes of the load and the load leading end and is screwed and locked with the nut in the shell, and the rod of the bolt does not contact the load leading end.

[0017] During installation, the circumferential rotation force and the axial stress exerted on the nut by the rotation locking of the bolt are not transmitted to the load leading end, but are transmitted to the shell by the nut. The circumferential rotation force and the axial stress exerted on the nut by the rotation locking of the bolt are directly transmitted to the shell, and the axial stress is particularly offset by the protruding portion embedded in the shell. The stress is not transmitted to the load leading end, which ensures the structural stability of the load leading end and the reliability of the electromagnetic relay.

[0018] After installation is completed, the continuous stress of the wire on the electromagnetic relay is also basically transmitted to the nut and the shell, which greatly eliminates the stress directly acting on the load leading end, thereby ensuring the reliability of the electromagnetic relay. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Part of the structure of the electromagnetic relay in the embodiment is shown in the exploded view; Figure 2 The shell part of the electromagnetic relay in the embodiment is shown in the structure view; Figure 3 The shell part of the electromagnetic relay in the embodiment is shown in the structure view;Figure 2 a cross-sectional view along line A-A; Figure 4 Fig. 2 shows a schematic view of the electromagnetic relay in an assembled state of use according to an embodiment; Figure 5 Fig. 3 shows a schematic view of the electromagnetic relay according to an embodiment; Figure 4 a cross-sectional view along line B-B. DETAILED DESCRIPTION

[0020] To further illustrate the embodiments, the present application provides drawings. These drawings are part of the disclosure of the present application and are mainly used to illustrate the embodiments and can be used to explain the operating principles of the embodiments in conjunction with the related descriptions in the specification. Those of ordinary skill in the art should be able to understand other possible implementations and advantages of the present application in conjunction with these. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0021] In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back", and the like orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0022] The present application will be further described in conjunction with the drawings and specific embodiments.

[0023] Referring to Figures 1 to 5 Fig. 3 shows a schematic view of the electromagnetic relay according to an embodiment; Fig. 4 shows a schematic view of the electromagnetic relay according to an embodiment; and Fig. 5 shows a schematic view of the electromagnetic relay according to an embodiment. As shown in the drawings, the present embodiment provides an electromagnetic relay, which comprises a shell 10 and a relay main body 20 assembled on the shell 10. In the present embodiment, the relay main body 20 adopts an existing structure, for example, the relay main body 20 comprises an electromagnetic part and a contact part, the electromagnetic part comprises a coil, a yoke and an armature assembly, etc., the contact part comprises a moving spring and a stationary spring, etc., and the specific structural connection relationship belongs to the prior art, which will not be described here.

[0024] The relay main body 20 has load leading ends 21, in this embodiment, the number of the load leading ends 21 is two, which are the leading parts of the moving spring and the leading parts of the static spring respectively. The shell 10 is embedded with nuts 30, the number of the nuts 30 is also two, to match the two load leading ends 21 respectively; specifically, the load leading ends 21 have clearance holes 22 corresponding to the screw holes 31 of the nuts 30, the hole diameter of the clearance holes 22 is larger than the hole diameter of the screw holes 31 of the nuts 30, and in the projection plane perpendicular to the axial direction (referring to the axial direction of the screw holes 31 and the clearance holes 22), the screw holes 31 of the nuts 30 are located in the clearance holes 22 and are arranged at a distance from the hole wall of the clearance holes 22; that is, the hole wall of the clearance holes 22 is also located on the periphery of the screw holes 31, so that the screw holes 31 are completely inside the clearance holes 22; as in this embodiment, the clearance holes 22 are coaxially arranged with the screw holes 31 of the nuts 30, that is, the center axes coincide, and the clearance holes 22 and the screw holes 31 are both circular holes, the hole wall of the screw holes 31 and the hole wall of the clearance holes 22 are similar to two concentric inner and outer circles.

[0025] At the same time, the outer periphery of the nut 30 has a protruding part 33 extending radially outward, which is embedded in the shell 10; further improving the connection firmness of the shell 10 and the nut 30.

[0026] When the client performs the installation operation, as shown in Figure 4 and Figure 5 , the shank 41 of the bolt 40 is sequentially inserted through the load end 50 (i.e. the wire) and the clearance hole 22 of the load leading end 21 and is screwed and locked with the nut 30 in the shell 10, that is, the shank 41 of the bolt 40 is screwed in the screw hole 31 of the nut 30, the diameter of the shank 41 of the bolt 40 is matched with the hole diameter of the screw hole 31 of the nut 30, that is, the diameter of the shank 41 of the bolt 40 is not greater than the screw hole 31 of the nut 30, and due to the arrangement of the clearance hole 22 of the load leading end 21, a certain gap is always maintained between the load leading end 21 (i.e. the inner wall of the clearance hole 22) and the shank 41 of the bolt 40; so that the shank 41 of the bolt 40 will not contact the load leading end 21, thereby avoiding applying stress (such as circumferential rotation force and possible axial or radial stress) to the load leading end 21, ensuring the structural stability of the load leading end 21 and the reliability of the electromagnetic relay. After screwing and fixing, the nut 42 of the bolt 40 will abut against the load end 50.

[0027] After the installation is completed, the wire continuously applies stress to the electromagnetic relay, the stress includes axial, radial and / or circumferential stress, wherein most of the stress is transmitted to the nut 30 and the shell 10 through the bolt 40, and the setting of the protruding portion 33 can well eliminate the stress in the axial direction. Specifically, since the load end 50 (i.e. the wire) also forms contact with the load lead-out end 21, part of the stress will also be directly transmitted to the load lead-out end 21, but through the design of the present application, most of the stress is shared by the bolt 40, the nut 30 and the shell 10, so the structural stability of the load lead-out end 21 and the reliability of the electromagnetic relay can be well guaranteed.

[0028] Specifically, the above axial, radial and circumferential directions are described with the bolt 40 as the reference.

[0029] In the embodiment, the clearance hole 22 of the load lead-out end 21 and the threaded hole 31 of the nut 30 are coaxially arranged in a circular hole structure, and the circular clearance hole 22 is convenient for processing and forming. In the scheme, the function of the clearance hole 22 is to give way to avoid contact with the bolt 40, so in other embodiments, the clearance hole 22 can also be a hole with other shapes, such as a square, triangular, oval and polygonal regular shape hole, or a hole with other irregular shapes; as long as the threaded hole 31 of the nut 30 is located in the clearance hole 22 and is spaced apart from the hole wall of the clearance hole 22 in the projection plane perpendicular to the axial direction.

[0030] The shell 10 is an insulating plastic shell; the nut 30 is embedded in the shell 10 by mold injection, that is, when the shell 10 is injection molded, the nut 30 is first placed in the injection mold, and then the shell 10 is injection molded, so that the nut 30 is directly embedded in the shell 10; in this way, the preparation is simple, and the connection between the shell 10 and the nut 30 is firm. Of course, in other embodiments, the nut 30 can also be embedded in the shell 10 by subsequent assembly, but the assembly method has the problems of assembly out of place or poor firmness, which is not preferred.

[0031] Specifically, the outer periphery of the nut 30 is non-circular, specifically a hexagonal nut, that is, the outer periphery of the nut 30 is hexagonal, in this way, on the one hand, the hexagonal nut is a standard existing part and can be directly purchased, and on the other hand, the non-circular outer periphery is embedded in the shell 10 to form a firm circumferential limit with the shell 10, and the stress in the circumferential direction is better eliminated.

[0032] The outer end surface 32 of the nut 30 is exposed to and flush with the surface 11 of the housing 10, and can stably support the load introduction end 21 above. Of course, in other embodiments, as long as the screw hole 31 of the nut 30 is exposed.

[0033] Although the present application has been particularly shown and described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application as defined by the appended claims.

Claims

1. An electromagnetic relay comprising a housing and a relay main body assembled to the housing, the relay main body having a load lead-out terminal, characterized by: The nut is embedded in the shell, the load leading end has a clearance hole corresponding to the screw hole of the nut, the clearance hole has a larger diameter than the screw hole of the nut, and in the projection plane perpendicular to the axial direction, the screw hole of the nut is located in the clearance hole and is arranged at a distance from the hole wall of the clearance hole; the outer periphery of the nut has a radially outwardly extending protruding portion, which is also embedded in the shell.

2. The electromagnetic relay according to claim 1, characterized in that: The clearance hole of the load leading end is coaxially arranged with the screw hole of the nut.

3. The electromagnetic relay according to claim 1 or 2, characterized in that: The clearance hole of the load leading end is a circular hole or a square hole.

4. The electromagnetic relay according to claim 1, characterized in that: The shell is a plastic shell.

5. The electromagnetic relay according to claim 4, characterized in that: The nut is embedded in the shell by injection molding.

6. The electromagnetic relay of claim 1, wherein: The nut is embedded in the shell by assembly.

7. The electromagnetic relay of claim 1, wherein: The outer end surface of the nut is exposed on the surface of the shell.

8. The electromagnetic relay according to claim 7, characterized in that: The outer end surface of the nut is flush with the surface of the shell.

9. The electromagnetic relay of claim 1, wherein: The outer peripheral surface of the nut is non-circular.

10. The electromagnetic relay according to claim 9, characterized in that: The nut is a hexagonal nut.

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