Magnetic circuit component for electromagnetic release and electromagnetic release

Abstract

The utility model relates to a magnetic circuit component for an electromagnetic release and the electromagnetic release. The magnetic circuit component for the electromagnetic release comprises a yoke and annular magnetic steel attached to the surface of one side of the yoke, the axis corresponding to the annular shape of the magnetic steel is defined as a rotating shaft, and the magnetic steel is fixedly arranged in the mode that the magnetic steel cannot rotate around the rotating shaft. As the magnetic steel is fixedly arranged in a manner that the magnetic steel cannot rotate around the rotating shaft, the position stability of the magnetic steel and the consistency of the magnetic performance of the magnetic steel after magnetizing and demagnetizing are ensured, and the sensitivity and reliability of the electromagnetic release are ensured.

Description

Technical Field

[0001] The utility model relates to the manufacturing technology of switch electrical appliances, and particularly to improvements in electromagnetic tripping devices. Background Art

[0002] An existing electromagnetic tripping device is of a magnetic holding type, and includes a yoke, an armature, a permanent magnet, a coil, a tension spring and a push rod. The permanent magnet is adhesively assembled on one side surface of the yoke. Under the influence of the magnetic flux of the permanent magnet, the armature is magnetically adsorbed on the pole surface of the yoke, and the tension spring is stretched and energy-stored by the armature. When the coil is energized, the magnetic flux generated by the coil reduces the magnetic flux of the permanent magnet, so that the adsorption force of the yoke on the armature is weakened. Under the action of the elastic force of the tension spring, the armature disengages and pushes the push rod to eject the electromagnetic tripping device, so as to trigger the tripping action of the tripping mechanism in the switch electrical appliance.

[0003] The existing permanent magnets are generally of two types, namely circular ring-shaped and strip-shaped. At present, a problem is often found during actual product testing, that is, the performance of the electromagnetic tripping device equipped with a circular ring-shaped permanent magnet is unstable. In particular, the magnetic properties of some circular ring-shaped permanent magnets are inconsistent after magnetization and demagnetization, which leads to a decrease in the sensitivity and reliability of the electromagnetic tripping device. Summary of the Utility Model

[0004] In view of the above problems, the utility model provides a magnetic circuit component for an electromagnetic tripping device with an optimized structure, and an electromagnetic tripping device with the magnetic circuit component.

[0005] The utility model is implemented by adopting the following technical solutions:

[0006] The utility model provides a magnetic circuit component for an electromagnetic tripping device, which includes a yoke and a ring-shaped permanent magnet adhesively assembled on one side surface of the yoke. The axis corresponding to the ring of the permanent magnet is defined as the rotation axis, and the permanent magnet is fixedly arranged in a manner that it cannot rotate around the rotation axis.

[0007] Any assembly structure that can form an anti-rotation effect on the permanent magnet during the assembly process of the permanent magnet can be adopted. For example, the permanent magnet can be directly glued and fixed on the yoke. Another example is to utilize the existing inner hole structure of the permanent magnet, and an insertion shaft is set to perform an interference fit with the permanent magnet, so that the permanent magnet cannot rotate around the rotation axis. The insertion shaft can be fixedly arranged on the yoke or other structures of the magnetic circuit component. For example, in some structures, a bracket for supporting the permanent magnet is provided in the magnetic circuit component, and the insertion shaft can also be fixedly arranged on the bracket.

[0008] In one embodiment, an anti-rotation portion is provided on the permanent magnet, and at least one of the yoke and the bracket is provided with an anti-rotation mating portion. The anti-rotation portion and the anti-rotation mating portion are implemented to be able to form an abutting and limiting fit at least in the circumferential direction of the permanent magnet, so as to prevent the permanent magnet from rotating around the rotation axis.

[0009] In one embodiment, the anti-rotation portion is a notch structure provided on the outer edge of the permanent magnet, and the anti-rotation mating portion is provided outside the permanent magnet and abuts against the anti-rotation portion in the circumferential direction of the permanent magnet.

[0010] In one embodiment, the anti-rotation portion is a trimmed plane provided on the outer edge of the permanent magnet, and the width of the trimmed plane is equal to the thickness of the permanent magnet, or the width of the trimmed plane is less than the thickness of the permanent magnet.

[0011] In one embodiment, the anti-rotation portion is a boss provided on the outer edge of the permanent magnet and protruding radially outward from the permanent magnet, and the anti-rotation mating portion includes two abutting portions provided on both circumferential sides of the anti-rotation portion.

[0012] In one embodiment, the cross-section of the inner hole of the permanent magnet is a non-circular surface, and the anti-rotation mating portion and the inner hole of the permanent magnet are axially hub-connected together in a forming connection manner.

[0013] In one embodiment, the anti-rotation portion is a pin provided on the axial end face of the permanent magnet, and the anti-rotation mating portion is a pin hole inserted with the pin; or the anti-rotation portion is a pin hole provided on the axial end face of the permanent magnet, and the anti-rotation mating portion is a pin inserted into the pin hole.

[0014] Based on the above magnetic circuit components, the present invention further provides an electromagnetic release, including a housing and the above magnetic circuit components.

[0015] The present invention has the following beneficial effects: Since the permanent magnet is fixedly arranged in a manner that it cannot rotate around the rotating shaft, the position stability of the permanent magnet and the consistency of the magnetic properties after magnetization and demagnetization of the permanent magnet are ensured, and the sensitivity and reliability of the electromagnetic release are guaranteed. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the magnetic circuit components for the electromagnetic release in Embodiment 1;

[0017] Figure 2 is a schematic diagram of the permanent magnet in Embodiment 1 (angle one);

[0018] Figure 3 is a schematic diagram of the permanent magnet in Embodiment 1 (angle two);

[0019] Figure 4 is a schematic diagram of the bracket in Embodiment 1;

[0020] Figure 5(a) is a schematic diagram of a deformation example of the permanent magnet in Embodiment 1;

[0021] Figure 5(b) is a schematic diagram of another deformation example of the permanent magnet in Embodiment 1;

[0022] Figure 6 Schematic diagram of still another variant of the permanent magnet in Embodiment 1;

[0023] Figure 7 Schematic diagram of the permanent magnet in Embodiment 2;

[0024] Figure 8 Schematic diagram of the bracket in Embodiment 2;

[0025] Figure 9 Exploded view of the magnetic circuit component for the electromagnetic release in Embodiment 3;

[0026] Figure 10 Schematic diagram of the bracket in Embodiment 4;

[0027] Figure 11 Schematic diagram of the permanent magnet in Embodiment 4. Detailed implementation manners

[0028] To further illustrate each embodiment, the present utility model provides accompanying drawings. These accompanying drawings are a part of the disclosure of the present utility model, which are mainly used to illustrate the embodiments and can be used to explain the operation principle of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present utility model. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0029] Aiming at the problem of unstable performance of the electromagnetic release equipped with an annular permanent magnet, the inventor has conducted a number of tests on the product. First, according to the phenomenon that the magnetic properties of the annular permanent magnet are inconsistent after magnetization and demagnetization, the inventor found through multiple tests that the magnetic properties of the permanent magnet are highly correlated with the shape of the permanent magnet and the magnetization direction. Further, the inventor studied the position stability of the annular permanent magnet after assembly and found that compared with the bar-shaped permanent magnet, since the annular permanent magnet is generally assembled by riveting, once the riveting is not tight enough, the annular permanent magnet is likely to rotate around the riveting axis, resulting in a change in position and affecting the consistency of the magnetic properties of the permanent magnet after magnetization and demagnetization. Therefore, the following embodiments are proposed in this application:

[0030] Embodiment 1:

[0031] Referring to Figures 1-4 As shown, as a preferred embodiment of the present utility model, a magnetic circuit component for an electromagnetic release is provided, including a yoke 1, a permanent magnet 2, and a bracket 3. The yoke 1 can be fixedly installed in the housing of the electromagnetic release. The permanent magnet 2 is adhesively assembled on one side surface of the yoke 1, and the bracket 3 supports the permanent magnet 2. In this embodiment, the permanent magnet 2 is of an annular structure, and the two axial ends of the permanent magnet 2 are respectively clamped between the yoke 1 and the bracket 3.

[0032] The outer edge of the magnet steel 2 is provided with a trimming plane 21, and the bracket 3 is fixedly provided with an anti-rotation mating part 31 corresponding to the trimming plane 21. The anti-rotation mating part 31 and the trimming plane 21 are abutted against each other to prevent the circumferential deflection of the magnet steel 2, ensuring the position stability of the magnet steel 2 and the consistency of the magnetic properties of the magnet steel 2 after magnetization and demagnetization.

[0033] In this embodiment, there are two groups of the anti-rotation mating part 31 and the trimming plane 21. These two groups of the anti-rotation mating part 31 and the trimming plane 21 are symmetric at 180 degrees to improve the limiting effect.

[0034] In other embodiments, the anti-rotation mating part 31 can also be fixedly arranged on the yoke iron 1, or the anti-rotation mating part 31 is arranged on both the yoke iron 1 and the bracket 3. However, arranging the anti-rotation mating part 31 on the bracket 3 is more beneficial to the manufacture of the yoke iron 1.

[0035] In this embodiment, the trimming plane 21 is a regular and flat straight plane. In other embodiments, the trimming plane 21 can also be replaced with an irregular or uneven surface structure, as long as the surface structure has at least one part that forms a circumferential abutment with the anti-rotation mating part 31. For example, Fig. 5(a) and Fig. 5(b) show deformation examples of the magnet steel 2 in this embodiment. In the deformation example of Fig. 5(a), the trimming plane 21 is replaced with a V-shaped folding plane; in the deformation example of Fig. 5(b), the trimming plane 21 is replaced with a toothed plane. In short, as long as a notch structure is provided on the outer edge of the magnet steel 2 and the anti-rotation mating part 31 can form a circumferential abutment with the notch structure. However, adopting the solution of the trimming plane 21 in this embodiment is beneficial to the manufacturing and forming of the magnet steel 2 and the anti-rotation mating part 31.

[0036] Figure 6 Fig. shows still another deformation example of the magnet steel 2 in this embodiment. In this deformation example, the width H of the trimming plane 21A is smaller than the thickness W of the magnet steel 2A. In comparison, the width of the trimming plane 21 in this embodiment is equal to the thickness of the magnet steel 2. The trimming plane 21 in this embodiment is easier to manufacture, but the trimming plane 21A in this deformation example saves more magnet steel materials.

[0037] The cutting plane 21 actually serves as an anti-rotation portion provided on the magnet 2. The anti-rotation portion and the anti-rotation mating portion 31 cooperate to achieve the circumferential anti-rotation of the magnet 2. Obviously, in order to achieve the anti-rotation of the magnet 2, any assembly structure that can form an anti-rotation effect on the magnet during the magnet assembly process can be adopted. For example, in another embodiment, the magnet 2 is directly glued and fixed to the yoke 1 to achieve the anti-rotation of the magnet 2. In this embodiment, since the magnet 2 is glued and fixed to the yoke 1, the bracket 3 can be cancelled. Again, by using the existing inner hole structure of the magnet 2, an insertion shaft is provided to perform an interference fit with the magnet 2, so that the magnet 2 cannot rotate around the rotation shaft. The insertion shaft can be fixedly provided on the yoke 1 or fixedly provided on the bracket 3. The two schemes of gluing and interference fit for fixing the magnet 2 can simplify the structure and facilitate manufacturing, but the magnet 2 cannot be removed after assembly and cannot be magnetized and demagnetized repeatedly. In this embodiment, the bracket 3 is used to support the magnet 2, so that the magnet 2 is detachable, which is convenient for the maintenance and replacement of the magnet 2.

[0038] Embodiment 2:

[0039] This embodiment provides a magnetic circuit component for an electromagnetic release, which is basically similar to Embodiment 1. The difference is that, as Figure 7 , 8 , in this embodiment, the anti-rotation portion is a convex platform 21B provided on the outer edge of the magnet 2B and protruding radially outward from the magnet, and the anti-rotation mating portion is a resisting portion 31B fixedly provided on the bracket 3B. Corresponding to one convex platform 21B, two resisting portions 31B are provided on both circumferential sides of the convex platform 21B, that is, the convex platform 21B is provided between the two resisting portions 31B. The circumferential abutment of the convex platform 21B and the resisting portion 31B forms the anti-rotation of the magnet 2B.

[0040] Obviously, the resisting portion 31B can also be provided on the yoke 1, but setting the resisting portion 31B on the bracket 3B is more conducive to the manufacture of the yoke 1.

[0041] Taking one convex platform 21B and two resisting portions 31B cooperating with it as a group, this embodiment also has two sets of convex platform 21B and resisting portion 31 structures that are symmetric about 180 degrees.

[0042] Combining Embodiment 1 and this embodiment for further illustration, if the anti-rotation portion is provided on the outer edge of the magnet, the anti-rotation portion can be either a notch (recess) structure or a convex structure, as long as it can change the circular outer contour of the magnet to form a circumferential abutment surface, and then the circumferential abutment surface abuts against the anti-rotation mating portion cooperating with it. Compared with Embodiment 1, in this embodiment, the two resisting portions 31B form an insertion groove for the convex platform 21B, so it is more conducive to the position positioning during the assembly of the magnet 2B and the bracket 3B.

[0043] Embodiment 3:

[0044] Refer to Figure 9 , this embodiment provides a magnetic circuit component for an electromagnetic release, which is basically similar to Embodiment 1. The difference is that in this embodiment, the inner hole 22 of the magnet 2C is set as a trimmed round hole, and a shaft portion 11 is fixedly provided on the yoke 1C. The shaft portion 11 is a trimmed round shaft whose shape matches the inner hole 22. The shaft portion 11 and the inner hole 22 are inserted into each other, so that the shaft portion 11 and the inner hole 22 are connected in a shaft-hub connection manner by forming connection, realizing the circumferential limit of the magnet 2C.

[0045] Similarly, the inner hole 22 can also be implemented as other shapes in other embodiments, such as triangular or square, and the shape of the shaft portion 11 is changed accordingly. In short, as long as the cross-section of the inner hole 22 is a non-circular surface, the forming connection with the shaft portion 11 can be realized.

[0046] The inner hole 22 serves as the anti-rotation portion of the magnet 2C in this embodiment, and the shaft portion 11 serves as the anti-rotation mating portion. The shaft portion 11 can also be fixedly connected to the bracket 3.

[0047] In this embodiment, the shaft portion 11 is fixed to the yoke 1C in the form of interference insertion to simplify the structure of the yoke 1C and facilitate the manufacture of the yoke 1C. At the same time, the shaft portion 11 and the inner hole 22 are in interference fit, so that the magnet 2C can be directly fixed, and thus the structure of the bracket can be cancelled. Compared with the interference fit of ordinary cylinders and round holes, the shaft portion 11 and the inner hole 22 in this embodiment can have a better anti-rotation effect due to the existence of non-circular forming surfaces.

[0048] Forming connection is a form of shaft-hub connection. For the inner hole 22 of the magnet 2C, on the basis of providing a shaft portion on the yoke 1C or the bracket 3 to be inserted into the inner hole 22, other shaft-hub connection methods can also be used to realize the circumferential limit of the magnet 2C, such as key connection and pin connection.

[0049] Embodiment 4:

[0050] Refer to Figure 10 , 11 , this embodiment provides a magnetic circuit component for an electromagnetic release, which is basically similar to Embodiment 1. The difference is that in this embodiment, the anti-rotation portion is a pin 21D provided on the axial end face of the magnet 2D, and the anti-rotation mating portion is a pin hole 12 provided on the yoke 1D. The pin hole 12 and the pin 21D are inserted into each other to realize the anti-rotation of the magnet 2D.

[0051] In other embodiments, the anti-rotation portion can also be a pin hole provided on the magnet 2D, and the anti-rotation mating portion is a pin provided on the yoke 1D.

[0052] The bracket for supporting the magnet 2D is not shown in this embodiment. Obviously, the anti-rotation mating part can also be provided on the bracket 3. In addition, two sets of pin holes 12 and pins 21D that are symmetric about 180 degrees can be provided. If the pin holes 12 and the pins 21D adopt an interference fit, the bracket can also be cancelled accordingly.

[0053] Embodiment 5:

[0054] This embodiment also provides an electromagnetic release, which includes a housing, an armature, a coil, a tension spring, a push rod, and the magnetic circuit components for the electromagnetic release according to any one of Embodiments 1-4, and has the technical effects corresponding to the structures in Embodiments 1-4.

[0055] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention defined by the appended claims all fall within the protection scope of the present invention.

Claims

1. A magnetic circuit component for an electromagnetic release, comprising a yoke and an annular permanent magnet adhesively assembled on one surface of the yoke, characterized in that: Define the axis corresponding to the ring shape of the permanent magnet as the rotating shaft, and the permanent magnet is fixedly arranged in a manner that it cannot rotate around the rotating shaft.

2. The magnetic circuit component for an electromagnetic release according to claim 1, characterized in that: It further includes a bracket for supporting the permanent magnet. A rotation prevention portion is provided on the permanent magnet, and a rotation prevention mating portion is provided on at least one of the yoke and the bracket. The rotation prevention portion and the rotation prevention mating portion are implemented to be able to form an abutting and limiting fit at least in the circumferential direction of the permanent magnet, thereby preventing the permanent magnet from rotating around the rotating shaft.

3. The magnetic circuit component for an electromagnetic release according to claim 2, characterized in that: The rotation prevention portion is a notch structure provided on the outer edge of the permanent magnet, and the rotation prevention mating portion is provided outside the permanent magnet and abuts against the rotation prevention portion in the circumferential direction of the permanent magnet.

4. The magnetic circuit component for an electromagnetic release according to claim 3, characterized in that: The rotation prevention portion is a trimmed flat surface provided on the outer edge of the permanent magnet, and the width of the trimmed flat surface is equal to the thickness of the permanent magnet, or the width of the trimmed flat surface is less than the thickness of the permanent magnet.

5. The magnetic circuit component for an electromagnetic release according to claim 2, characterized in that: The rotation prevention portion is a boss provided on the outer edge of the permanent magnet and protruding radially outward of the permanent magnet, and the rotation prevention mating portion includes two resisting portions provided on both circumferential sides of the rotation prevention portion.

6. The magnetic circuit component for an electromagnetic release according to claim 2, characterized in that: The cross-section of the inner hole of the permanent magnet is a non-circular surface, and the rotation prevention mating portion and the inner hole of the permanent magnet are axially hub-connected in a formed connection manner.

7. The magnetic circuit component for an electromagnetic release according to claim 2, characterized in that: The rotation prevention portion is a pin provided on the axial end face of the permanent magnet, and the rotation prevention mating portion is a pin hole inserted with the pin; or the rotation prevention portion is a pin hole provided on the axial end face of the permanent magnet, and the rotation prevention mating portion is a pin inserted with the pin hole.

8. The magnetic circuit component for an electromagnetic release according to claim 1, characterized in that: The permanent magnet and the yoke are fixed by gluing.

9. The magnetic circuit component for an electromagnetic release according to claim 1, characterized in that: The inner hole of the permanent magnet is assembled and fixed in an interference fit manner.

10. The electromagnetic release includes a housing, and is characterized in that: It further includes a magnetic circuit component for an electromagnetic release as described in any one of claims 1-9.

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