Injection molding magnetic isolation magnetic circuit structure and relay

Abstract

The utility model provides an injection molding magnetism-isolating magnetic circuit structure and relay, the injection molding magnetism-isolating magnetic circuit structure comprises yoke iron, magnetic steel, an iron core and a coil arranged at the periphery of the iron core, the yoke iron comprises a left yoke iron and a right yoke iron which are oppositely arranged left and right, the magnetic steel is arranged between the left yoke iron and the right yoke iron, and the coil is arranged at the periphery of the iron core. The left yoke iron, the right yoke iron and the magnetic steel are connected through a plastic body which is integrally formed through injection molding, the plastic body further extends to one opposite face of the left yoke iron and the right yoke iron to form a magnetism isolating portion, and the iron core is connected to the magnetism isolating portion. Therefore, part integration is achieved, assembling is easy, parts are simplified, and the magnetic isolation effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a relay field, concretely relates to a magnetic circuit structure of injection molding and a relay. BACKGROUND

[0002] The relay is an automatic switch commonly used in various circuits, and the relay is mainly composed of a magnetic circuit part and a contact part. For example, the magnetic circuit structure of a polarization relay disclosed in CN102208305B comprises a magnetic steel, a yoke, a magnetic separation sheet, an armature (i.e. an iron core), etc. The magnetic steel is arranged between the two yokes, and the armature is arranged between the two yokes through the magnetic separation sheet. The above structure adopts a conventional multi-part assembly mode, and a plurality of processes are required during assembly, which is troublesome and low in efficiency. SUMMARY

[0003] Therefore, the utility model provides a magnetic circuit structure of injection molding and a relay to improve the above problems.

[0004] To achieve the above object, the utility model provides the technical scheme as follows:

[0005] A magnetic circuit structure of injection molding, comprising a yoke, a magnetic steel, an iron core and a coil arranged on the periphery of the iron core, the yoke comprises left and right yokes arranged oppositely, the magnetic steel is arranged between the left and right yokes, the left and right yokes and the magnetic steel are connected through a plastic body integrally injection molded, and the plastic body further extends to an opposite surface of the left and right yokes to form a magnetic separation part, and the iron core is connected to the magnetic separation part.

[0006] Further, the magnetic separation part of the plastic body comprises a combination part arranged on the left and right yokes respectively, the two combination parts are provided with a protruding rib, the iron core is provided with a notch on both sides, and the protruding rib is fitted into the notch of the iron core.

[0007] Further, the magnetic separation part of the plastic body comprises a combination part arranged on the left and right yokes respectively, the two combination parts are provided with a protruding rib, the iron core is provided with a notch on both sides, and the protruding rib is fitted into the notch of the iron core.

[0008] Further, the magnetic separation part of the plastic body comprises a combination part arranged on the left and right yokes respectively, the first side is fitted through the notch arranged on the combination part and the protruding rib arranged on the iron core, and the second side is fitted through the notch arranged on the iron core and the protruding rib arranged on the combination part.

[0009] Further, the cross-sectional size of the notch is slightly larger than the cross-sectional size of the protruding rib, so that the iron core can move within a certain range relative to the yoke.

[0010] Further, the cross section of the protruding rib is in a circular arc structure, and the notch is also a circular arc notch.

[0011] Further, the upper surface of the convex rib is an inclined guide surface.

[0012] Further, the left yoke and the right yoke are provided with recesses on the opposite surfaces of the magnetic separation part, the magnetic separation part is filled in the recesses and protrudes from the outer surfaces of the left yoke or the right yoke.

[0013] Further, the left yoke and the right yoke are both in U-shaped structures, including horizontal parts and vertical parts connected to both ends of the horizontal parts, the magnetic steel is arranged between the horizontal parts of the left yoke and the right yoke and connected through the plastic body, the two vertical parts of the left yoke and the two vertical parts of the right yoke are arranged one by one in correspondence, and the magnetic separation part is arranged on one set of corresponding two vertical parts.

[0014] Further, the plastic body is formed with a clearance hole, which is formed after the positioning magnetic steel and the positioning part of the yoke are demolded.

[0015] A relay at least includes the magnetic circuit structure of the injection molded magnetic separation.

[0016] The technical scheme has the following beneficial effects:

[0017] The magnetic steel and the two yokes (i.e. the left yoke and the right yoke) are connected through the integrally injection molded plastic body, thereby forming a whole, the assembly process is completed at one time, the assembly is simple, the assembly efficiency is high, and the plastic body further extends to the opposite surface of the left yoke and the right yoke to form the magnetic separation part, the iron core is connected to the magnetic separation part, thereby playing a good magnetic separation effect and reducing the parts. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 shows the whole structure schematic diagram of the yoke and the magnetic steel through integrally injection molding in the embodiment;

[0019] Figure 2 Fig. 2 shows the front view of the structure; Figure 1

[0020] Figure 3 Fig. 3 shows the appearance schematic diagram of the relay in the embodiment; Figure 1

[0021] Figure 4 Fig. 4 shows the appearance schematic diagram of the relay in the embodiment; Figure 2

[0022] Figure 5 Fig. 5 shows the sectional view of line A-A in the embodiment; Figure 4

[0023] Figure 6 Fig. 6 shows the sectional view of line B-B in the embodiment; Figure 5 ​​​​Enlarged schematic diagram of region B in the middle. Detailed Implementation

[0024] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0026] Reference Figures 1 to 6 As shown, this embodiment provides a magnetic circuit structure for injection molding magnetic isolation, including a yoke 13, a magnet (not shown), an iron core 14, and a coil 15 disposed around the iron core 14. The yoke 13 includes a left yoke 11 and a right yoke 12 arranged opposite each other. The magnet is disposed between the left yoke 11 and the right yoke 12. The left yoke 11, the right yoke 12, and the magnet are connected by an integrally injection-molded plastic body 20, forming a fixed connection through injection molding. This allows the left yoke 11, the right yoke 12, and the magnet to form a whole, enabling assembly to be completed in one step, simplifying assembly and increasing assembly efficiency. The plastic body 20 also extends to an opposite surface of the left yoke 11 and the right yoke 12 to form a magnetic isolation part 21, and the iron core 14 is connected to the magnetic isolation part 21. This magnetic isolation part 21 not only serves to isolate magnetic fields but also connects the iron core 14. Compared with the prior art, this reduces the number of parts (at least one magnetic isolation sheet can be eliminated).

[0027] This solution not only achieves integrated parts and easy assembly, but also simplifies parts and achieves the effect of magnetic shielding.

[0028] Specifically, in this embodiment, both the left yoke 11 and the right yoke 12 have a U-shaped structure, including a horizontal portion 105 and vertical portions connected to both ends of the horizontal portion 105. The magnet is disposed between the horizontal portion 105 of the left yoke 11 and the horizontal portion 105 of the right yoke 12 and connected by the plastic body 20. The two vertical portions of the left yoke 11 and the two vertical portions of the right yoke 12 are arranged in a one-to-one correspondence. The vertical portions connected to both ends of the horizontal portion 105 are defined as the first vertical portion 101 and the second vertical portion 102, respectively. The first vertical portion 101 of the left yoke 11 corresponds to the first vertical portion 101 of the right yoke 12, and the second vertical portion 102 of the left yoke 11 corresponds to the second vertical portion 102 of the right yoke 12. The magnetic shielding part 21 is disposed on one of two corresponding vertical parts, that is, the magnetic shielding part 21 is disposed on the two corresponding first vertical parts 101, and the magnetic shielding part 21 extends to the right side 103 of the first vertical part 101 of the left yoke 11 and the left side 104 of the first vertical part 101 of the right yoke 12; that is, the "opposite surface of the left yoke 11 and the right yoke 12" in the above statement "the plastic body 20 also extends to a opposite surface of the left yoke 11 and the right yoke 12 to form the magnetic shielding part 21" refers to the right side 103 of the first vertical part 101 of the left yoke 11 and the left side 104 of the first vertical part 101 of the right yoke 12. Of course, in other embodiments, the structure of the left yoke 11 and the right yoke 12 is not limited to this.

[0029] Furthermore, in this embodiment, the magnetic shielding part 21 of the plastic body 20 includes a connecting part 22 respectively provided on the left yoke 11 and the right yoke 12, and a rib 23 protruding from the connecting part 22. That is, both the left yoke 11 and the right yoke 12 are provided with connecting parts 22, and both connecting parts 22 are provided with ribs 23, which are arranged opposite to each other. The connecting part 22 can fully engage with the yoke 13 to achieve a stable connection. The iron core 14 has recesses 141 on both sides, and the two ribs 23 respectively fit into the recesses 141 on both sides of the iron core 14, thereby realizing the assembly of the magnetic shielding part 21 and the iron core 14.

[0030] Specifically, the cross-sectional dimension of the notch 141 is slightly larger than that of the rib 23, so that the iron core 14 can move within a certain range relative to the yoke 13, which can both restrict the iron core 14 and better coordinate with the movement of the iron core 14.

[0031] The cross-section of the rib 23 is an arc-shaped structure, and the notch 141 is also an arc-shaped notch, which improves the fit and makes the movement of the iron core 14 smoother.

[0032] In this embodiment, the limiting cooperation of the rib 23 and the notch 141 is adopted to ensure that the contact point during the movement of the iron core is on the plastic (i.e., the plastic body 20), and the iron core 14 and the yoke 13 have no direct contact. The rib 23 of the plastic acts as a barrier, that is, a magnetic shield, reducing the voltage that can drive the relay to change its state. The rib 23 not only acts as a magnetic shield, but also limits the movement of the iron core 14, ensuring the reliability of the iron core 14 in the forward and backward movement directions, integrating multiple functions into one.

[0033] The upper surface 231 of the rib 23 is an inclined guide surface. During assembly, the iron core 14 can be pressed in from above, that is, the iron core 14 is placed above the magnetic shielding part 21, and the notch 141 is aligned with the rib 23 and then pressed down. The inclined guide surface has a good guiding effect, making the assembly smoother.

[0034] Meanwhile, to ensure a more secure connection between the magnetic shielding part 21 and the yoke 13, the left yoke 11 and right yoke 12 have recesses 106 on their opposite surfaces where the magnetic shielding part 21 is located. Specifically, the right side 103 of the first vertical portion 101 of the left yoke 11 and the left side 104 of the first vertical portion 101 of the right yoke 12 both have recesses 106, giving the yoke 13 an L-shaped surface. The magnetic shielding part 21 fills the recesses 106 and protrudes from the outer surface of either the left yoke 11 or the right yoke 12. The connecting portions 22 on both sides protrude from the right side 103 of the first vertical portion 101 of the left yoke 11 and the left side 104 of the first vertical portion 101 of the right yoke 12, respectively, allowing the connecting portions 22 of the magnetic shielding part 21 to contact the L-shaped surface of the yoke 13 for a more secure connection. Furthermore, the protrusion of the outer surface of the left yoke 11 or the right yoke 12 can effectively prevent the iron core 14 from directly contacting the yoke 13 during operation.

[0035] The structure of the magnetic shielding part 21 described above is one of the preferred embodiments of this solution. Of course, in other embodiments, the limiting and matching method of the rib 23 and the notch 141 is not limited to this. For example, the positions of the rib 23 and the notch 141 can be interchanged, that is, the two joints 22 are recessed with the notch 141, and the two sides of the iron core 14 are raised with the rib 23, which fits into the notch 141 of the joint 22; or the first side (such as the left side) is matched with the notch in the joint and the rib in the iron core, and the second side (such as the right side) is matched with the notch in the iron core and the rib in the joint. Alternatively, the structure of the magnetic shielding part 21 and the connection structure with the iron core 14 can also adopt other methods, such as replacing the strip-shaped rib 23 with the dot-shaped rib, and replacing the notch 141 of the iron core 14 with a cavity that matches the rib, etc.

[0036] Specifically, in this embodiment, a clearance hole is formed on the plastic body 20, such as... Figure 1The circular clearance hole 241 and the square clearance hole 242 shown are formed after the positioning components of the positioning magnet and the yoke 13 are demolded. That is, before injection molding to obtain the plastic body, the positioning components are used to position the magnet and the yoke 13 respectively. After injection molding is completed, the positioning components are disengaged, leaving the clearance holes mentioned above.

[0037] This embodiment also provides a relay, which includes at least the injection-molded magnetically isolated magnetic circuit structure described above. For example... Figures 3 to 6 As shown, the front end of the iron core 14 is connected to the magnetic shielding part 21, while the rear end is connected to the push card 16. The push card 16 is connected to the moving spring 31 of the contact part. The movement of the iron core 14 drives the moving spring 31 to move through the push card 16, thereby realizing the opening and closing of the relay.

[0038] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A magnetic circuit structure for injection molding and magnetic isolation, comprising a yoke, a magnet, an iron core, and a coil disposed around the iron core, wherein the yoke comprises a left yoke and a right yoke arranged opposite each other, and the magnet is disposed between the left yoke and the right yoke, characterized in that: The left yoke, right yoke, and magnet are connected by an integrally injection-molded plastic body, and the plastic body extends to one of the opposing surfaces of the left yoke and right yoke to form a magnetic shielding part, and the iron core is connected to the magnetic shielding part.

2. The magnetic circuit structure for injection molding magnetic isolation according to claim 1, characterized in that: The magnetic shielding part of the plastic body includes a joint portion respectively provided on the left yoke and the right yoke, with ribs protruding from the two joint portions. The iron core has recesses on both sides, and the ribs fit into the recesses of the iron core.

3. The magnetic circuit structure for injection molding magnetic isolation according to claim 1, characterized in that: The magnetic shielding part of the plastic body includes a joint portion respectively provided on the left yoke and the right yoke, the two joint portions having recessed notches, and the iron core having raised ribs on both sides, the raised ribs fitting into the notches of the joint portions.

4. The magnetic circuit structure for injection molding magnetic isolation according to claim 1, characterized in that: The magnetic shielding part of the plastic body includes a joint portion respectively provided on the left yoke and the right yoke. The first side is engaged by a notch provided in the joint portion and a rib provided in the iron core, and the second side is engaged by a notch provided in the iron core and a rib provided in the joint portion.

5. The injection-molded magnetic circuit structure for magnetic isolation according to claim 2, 3, or 4, characterized in that: The cross-sectional dimensions of the notch are slightly larger than those of the rib, so that the iron core can move within a certain range relative to the yoke.

6. The injection-molded magnetic circuit structure for magnetic isolation according to claim 2, 3, or 4, characterized in that: The cross-section of the rib is an arc-shaped structure, and the notch is also an arc-shaped notch.

7. The magnetic circuit structure for injection molding magnetic isolation according to claim 2, characterized in that: The upper surface of the rib is an inclined guide surface.

8. The injection-molded magnetic circuit structure for magnetic isolation according to claim 1, 2, 3, or 4, characterized in that: The left and right yokes have recesses on their opposite surfaces where magnetic shielding parts are provided, and the magnetic shielding parts are filled in the recesses and protrude from the outer surface of the left or right yoke.

9. The magnetic circuit structure for injection molding magnetic isolation according to claim 1, characterized in that: Both the left and right yokes have a U-shaped structure, including a horizontal part and vertical parts connected to both ends of the horizontal part. The magnet is disposed between the horizontal part of the left yoke and the horizontal part of the right yoke and is connected by the plastic body. The two vertical parts of the left yoke and the two vertical parts of the right yoke are arranged in a one-to-one correspondence. The magnetic shielding part is disposed on one of the two corresponding vertical parts.

10. A relay, characterized in that: It includes at least the injection-molded magnetic circuit structure described in any one of claims 1-9.

Images