A kind of restoring spring structure and balanced force type electromagnetic relay

Abstract

The application discloses a restoring spring structure and a balanced force type electromagnetic relay, and the restoring spring structure comprises a restoring spring leaf, the restoring spring leaf comprises an elastic part and a connecting part, one end of the elastic part is integrally formed with the connecting part, the other end of the elastic part extends away from the connecting part, and is used for assisting the armature reset of the balanced force type electromagnetic relay when a coil is de-energized; the elastic part is provided with an inclined section between two ends of the elastic part; and the restoring spring structure further comprises a supporting top part, the supporting top part abuts against a surface of the inclined section which faces the armature, so that the elastic part is formed with a pre-deformation in a direction away from the armature. The application can provide a larger idle stroke between the armature and the restoring spring leaf of the balanced force type electromagnetic relay without changing the installation position of the restoring spring leaf, ensures that the suction and repulsion force does not interfere, and thus ensures that the contact is effectively attracted; in the de-energized state of the relay, the restoring spring leaf has the same restoring repulsion force acting on the armature as the prior art, so that the effective release of the armature can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relays, in particular to a reset spring structure and a balanced force type electromagnetic relay. BACKGROUND

[0002] The balanced force type electromagnetic relay is also called a balanced force type sealed electromagnetic relay, which has considerable armature holding force and contact pressure in the energized and de-energized states, and thus has excellent environmental mechanical properties. However, due to the presence of a magnetic steel in the magnetic circuit structure, in the de-energized process, in order to eliminate the adverse effects of the magnetic steel on the release of the armature, an auxiliary armature release counterforce structure is added, which is usually realized by a reset spring sheet installed on the support frame of the balanced force type electromagnetic relay. In operation, the armature rotates around the rotating shaft under the combined action of the electromagnetic attraction, the contact pressure and the reset counterforce. In the energized process of the coil, in order to ensure reliable attraction of the relay, a certain air gap is required between the reset spring sheet and the armature, which is the movement stroke of the armature from the start of downward rotation to the point of just contacting the reset spring sheet in the energized state of the relay. When the air gap is too small, the electromagnetic attraction of the armature is smaller than the reset counterforce (attraction-counterforce curve interference), so that the armature cannot be attracted to the position and the relay cannot operate reliably. In the de-energized process of the coil, in order to ensure reliable release of the relay, the reset spring sheet needs to provide sufficient reset counterforce, and the air gap between the reset spring sheet and the armature cannot be too large. If the reset counterforce is too small, the release voltage of the relay cannot meet the standard requirements; if the air gap between the reset spring sheet and the armature is too large, the reset counterforce is smaller than the electromagnetic attraction under the release voltage (attraction-counterforce curve interference), so that the armature cannot be released to the position and the relay cannot be released reliably. SUMMARY

[0003] The present application provides a reset spring structure and a balanced force type electromagnetic relay, which solves the problem of interference between the electromagnetic attraction and the reset counterforce by improving the reset spring structure.

[0004] The technical scheme adopted by the present application to solve the technical problem is as follows: a reset spring structure, comprising a reset spring sheet, the reset spring sheet comprising an elastic part and a connecting part, one end of the elastic part being integrally formed with the connecting part, the other end of the elastic part extending away from the connecting part and being used for assisting the reset of the armature of the balanced force type electromagnetic relay in the de-energized process of the coil; the elastic part has an inclined section between the two ends, the high end of the inclined section being away from the connecting part; and further comprising a supporting top part, the supporting top part abutting against the surface of the inclined section facing the armature, so that the elastic part forms a pre-deformation in the direction away from the armature.

[0005] Further, two ends of the elastic part are respectively located on two sides opposite to the connecting part, and the connecting part is located above the inclined section; a first bending part is arranged between one end of the elastic part and the inclined section, and the first bending part is in the shape of a circular arc with a center directed to one side of the inclined section; the other end of the elastic part is bent downward into a hook shape.

[0006] Further, a second bending part is arranged on the inclined section, the second bending part is close to a contact position of the inclined section and the supporting top part, and the second bending part is located between one end of the elastic part and the contact position, or the second bending part is located between the other end of the elastic part and the contact position; the second bending part is a bending line in the width direction of the elastic part, the bending line divides the inclined section into a first inclined section and a second inclined section which are arranged in sequence from a low end to a high end of the inclined section, and the inclination of the first inclined section is smaller than the inclination of the second inclined section.

[0007] Further, the supporting top part and the other end of the elastic part are located on the same side of the connecting part, and the supporting top part is in the shape of a flat plate, and one end of the supporting top part opposite to the connecting part abuts against a surface of the inclined section facing the armature. Further, the elastic part is designed along the material grain direction, and the material of the restoring spring is stainless steel.

[0008] Further, a transition sheet is further included, the transition sheet is fixedly connected to an upper surface or a lower surface of the connecting part, and the supporting top part is arranged on the transition sheet; or the supporting top part is integrally formed with the connecting part, or the supporting top part is integrally formed with a fixed part, the fixed part is used for fixedly connecting with the connecting part, and the fixed part is integrally formed with a support frame of the balanced force type electromagnetic relay.

[0009] Further, the supporting top part is integrally formed with the transition sheet; the overall piece formed by the supporting top part and the transition sheet has a convex shape in the whole periphery, and the supporting top part corresponds to a narrow part of the convex shape.

[0010] Further, the transition sheet is fixedly welded with the connecting part, and two welding brackets are arranged on the transition sheet along the width direction of the elastic part, and the distance between the two welding brackets is greater than the width of the elastic part.

[0011] Further, the transition sheet is provided with a fixing sheet, the fixing sheet is used for fixedly connecting with the support frame of the balanced force type electromagnetic relay; the fixing sheet is integrally formed with the transition sheet, and the fixing sheet and the transition sheet are perpendicular or substantially perpendicular to each other; and a welding rib is arranged on the fixing sheet.

[0012] The application further provides a balanced force type electromagnetic relay, comprising two support frames and a magnetic circuit part located between the two support frames, an armature of the magnetic circuit part is installed in a seesaw form; at least one support frame is provided with the reset spring structure as described in the application, and the other end of the elastic part is matched below one end of the armature.

[0013] Compared with the prior art, the application has the following beneficial effects:

[0014] 1. Since the reset spring structure of the application further comprises the support top part which abuts against the surface of the inclined section facing the armature, the elastic part is pre-deformed in the direction away from the armature, therefore, the application can provide a larger idle stroke between the armature and the reset spring of the balanced force type electromagnetic relay without changing the installation position of the reset spring, ensure that the suction force does not interfere under the action voltage, and ensure the reliable action of the relay; in the de-energized state of the relay, the reset spring can provide the same reset force acting on the armature as the prior art, thereby ensuring the effective release of the armature under the specified release voltage.

[0015] 2. The first inclined section and the second inclined section are arranged so that the force points of the reset spring and the armature are farther away from the rotating shaft of the armature compared with the prior art, so that the reset spring can provide a larger torque for the armature with a smaller reset force, thereby facilitating the miniaturization of the reset spring structure; the arrangement of the first inclined section and the second inclined section also makes the idle stroke of the reset spring and the armature controllable, thereby ensuring the reliable release of the armature.

[0016] 3. The application further comprises the transition piece, and the support top part is arranged on the transition piece, so that the structure of the reset spring is simpler and the processing is more convenient.

[0017] 4. The overall piece formed by the support top part and the transition piece has a convex shape in the overall contour, and the support top part corresponds to the narrow part of the convex shape, so that the material can be saved and the overall weight can be reduced.

[0018] 5. The distance between the two welding brackets is greater than the width of the elastic part, which can reduce the risk of falling off of the welding point under stress, make the reset spring stable and reliable, and avoid the welding point from being subjected to torsion.

[0019] The application will be further described in detail below in combination with the drawings and examples; however, the reset spring structure and the balanced force type electromagnetic relay of the application are not limited to the examples. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the reset spring structure of the application;

[0021] Figure 2 is a front view of the reset spring structure of the application;

[0022] Figure 3 is a perspective view of the restoring spring of the present application;

[0023] Figure 4 is a perspective view of the transition piece of the present application;

[0024] Figure 5 is a perspective view of the restoring spring structure and the support frame in the combined state of the present application;

[0025] Figure 6 is a perspective view of the balanced force electromagnetic relay of the present application Figure 1 (not including the shell);

[0026] Figure 7 is a perspective view of the balanced force electromagnetic relay of the present application Figure 2 (not including the shell, the support frame, etc.);

[0027] Figure 8 is a force and counterforce curve of the balanced force electromagnetic relay of the present application. DETAILED DESCRIPTION

[0028] Please refer to Figures 1-8 , a restoring spring structure of the present application, which comprises a restoring spring piece 1, the restoring spring piece 1 comprising an elastic part 11 and a connecting part 12, the elastic part 11 being integrally formed at one end with the connecting part 12, the other end of the elastic part 11 extending away from the connecting part 12 and being used to assist the return of the armature of the balanced force electromagnetic relay when the coil is de-energized. The elastic part 11 has an inclined section between the two ends, the high end of the inclined section being away from the connecting part 12. The restoring spring structure further comprises a supporting top 21, which is stationary relative to the connecting part 12 and abuts against the surface of the inclined section facing the armature, so that the elastic part forms a pre-deformation in the direction away from the armature. Specifically, the supporting top 21 is located on the same side of the connecting part 12 as the other end of the elastic part 11, and the supporting top 21 is in the form of a flat plate, one end of the supporting top 21, which is away from the connecting part 12, abutting against the surface of the inclined section facing the armature. The surface of the inclined section facing the armature is the upper surface under the perspective view of the accompanying drawings of the present embodiment.

[0029] In the present embodiment, the elastic part 11 and the connecting part 12 are processed from the same elastic metal sheet, and specifically, the material of the restoring spring piece 1 is stainless steel, which has good workability. The elastic part 11 is designed along the material grain direction, which can obtain high material elastic modulus and good material stability, thereby ensuring to provide stable restoring force for the product. For example, Figure 3As shown, the connecting part 12 is located above the inclined section of the elastic part 11. The two ends of the elastic part 11 are located on opposite sides of the connecting part 12. One end of the elastic part 11 has a first bend 111 between it and the inclined section. The first bend 111 is an arc shape with its center facing the side where the inclined section is located. The other end of the elastic part 11 is bent downward into a hook shape.

[0030] In this embodiment, the inclined segment is provided with a second bend, which is located near the contact area between the inclined segment and the top of the support. The second bend is situated between the other end of the elastic portion and the contact area. However, this is not a limitation; in other embodiments, the second bend is located between one end of the elastic portion and the contact area. The second bend is a bend line 112 located in the width direction of the elastic portion. This bend line divides the inclined segment into a first inclined segment 113 and a second inclined segment 114, which are sequentially distributed from the lower end to the upper end of the inclined segment. The inclination of the first inclined segment 113 is less than the inclination of the second inclined segment 114.

[0031] In this embodiment, the invention further includes a transition piece 2, which is fixedly connected to the upper or lower surface of the connecting portion 12. The support top 21 is disposed on the transition piece 2. Specifically, the support top 21 is integrally formed with the transition piece 2, and the overall outline of the component formed by the support top 21 and the transition piece 2 is convex, with the support top 21 corresponding to the narrow part of the convex shape. This saves material on the transition piece 2 and reduces the overall weight. In other embodiments, the support top is integrally formed with the connecting portion, or the support top is integrally formed with a fixing portion for fixed connection with the connecting portion and integrally formed with the support frame of the balanced force electromagnetic relay.

[0032] In this embodiment, the transition piece 2 is welded and fixed to the connecting portion 12, and the transition piece 2 is provided with two weld blobes 23 distributed along the width direction of the elastic portion 11. The distance between the two weld blobes 23 is greater than the width of the elastic portion 11. Figure 4 As shown. In this way, the risk of the weld joint falling off due to stress can be reduced, making the restoring spring 1 stable and reliable, and avoiding the weld joint being subjected to torsional force. The connecting part 12 extends at both ends in the width direction of the elastic part 11 to facilitate welding and fixing with the two weld blobes 23 of the transition piece 2.

[0033] In this embodiment, the transition piece 2 is provided with a fixing piece 22, which is used to fix and connect to the support frame of the balanced force electromagnetic relay. Specifically, the fixing piece 22 and the transition piece 2 are integrally formed, and the two are perpendicular or approximately perpendicular to each other. "Approximately perpendicular" means that the difference between the included angle of the transition piece 2 and the fixing piece 22 and 90° (e.g., within 5°) is small, making it difficult to detect with the naked eye. The fixing piece 22 is provided with welding ribs for welding and fixing to the support frame, and improving the welding processability of the fixing part 22 and the support frame. The welding ribs are specifically formed by stamping corresponding parts of the fixing piece 22 from the front to the back. The front of the fixing piece 22 refers to the side of the fixing piece facing away from the support frame, and the back of the fixing piece 22 refers to the side of the fixing piece facing the support frame.

[0034] In the application of the restoring spring structure of the present invention, the fixing piece 22 on the transition piece 2 is welded to a suitable position on the support frame 3 of the balanced force electromagnetic relay, such as... Figure 5 As shown; the other end of the elastic part 11 of the restoring spring 1 is fitted below one end of the armature 51 of the balanced force electromagnetic relay, so that there is a free stroke between the armature 51 and the restoring spring 1, as shown. Figure 6 , Figure 7 As shown.

[0035] The attraction and reaction force curves of a balanced force electromagnetic relay are as follows: Figure 8 As shown in the figure, the horizontal axis represents the stroke of the armature 51, and the vertical axis represents the magnitude of the force. Curve a represents the electromagnetic attraction curve of the operating voltage, curve b represents the electromagnetic attraction curve of the release voltage, the oblique segment e represents the reaction force curve of the normally open contact, and the oblique segment f is the reaction force curve after the superposition of the reaction force of the normally open contact and the recovery reaction force; curve c represents the recovery reaction force curve of the recovery spring in the prior art, and curve d represents the recovery reaction force curve of the recovery spring 1 on the armature under the excitation state of the present invention; the horizontal distance between curve c and point 0 represents the idle stroke L1 between the armature and the recovery spring 1 in the prior art, and the horizontal distance between curve d and point 0 represents the idle stroke L2 between the armature and the recovery spring 1 of the present invention. The elastic part 11 of the recovery spring 1 is initially supported by the top support 21 and has a preload, so that the other end of the elastic part 11 is further away from the armature in the initial state than in the prior art. Therefore, the idle stroke L2 is greater than the idle stroke L1. It can be seen that, without changing the installation position of the restoring spring 1, the present invention can provide a larger free travel between the armature and the restoring spring 1, that is, the free travel L2 is greater than the free travel L1, thereby ensuring that the suction force does not interfere. Figure 8In the middle, curve a and curve c have intersection, which represents that the suction force interference occurs, and will affect the armature action, thus without increasing the excitation voltage, the effective suction of the contact can be ensured. In the de-excitation state of the relay, since the installation position of the return spring leaf is not changed, the return spring leaf has the same return force, and the armature can be ensured to be released at the specified release voltage.

[0036] The first inclined section 113 and the second inclined section 114 are arranged so that the inclined sections of the return spring leaf form two sections of the broken line type, which are far away from the rotating shaft of the armature compared with the prior art, so that the return spring leaf can provide greater torque for the armature with smaller return force, and further facilitate the miniaturization of the return spring structure. In addition, the arrangement of the first inclined section 113 and the second inclined section 114 can also make the air gap between the armature and the return spring leaf controllable, avoid the air gap between the return spring leaf and the armature being too large (i.e. the pre-deformation of the elastic part is too large), and the case that the return force is smaller than the electromagnetic suction force during the release of the armature, so that the armature cannot be reliably released.

[0037] The arrangement of the second bending part can prolong the contact time of the inclined section and the supporting top, so as to adjust the force of the return spring leaf on the armature to satisfy the balance of suction and return force. In the excitation state of the relay, the second bending part cooperates with the supporting top to avoid the rotating supporting point of the elastic part from instantaneously moving to the intersection of the first bending and the inclined section in the supporting top, that is, to avoid the force of the return spring leaf on the armature from increasing too fast, such as being greater than the electromagnetic suction force, and causing the armature to be unable to be attracted to the position. Figure 8 The oblique line section g represents the return force curve of the return spring leaf 1 on the armature in the de-excitation state when the inclined section of the return spring leaf is not provided with the second bending part, which is steeper than the oblique line section of the initial part of the curve d. The rotating supporting point of the elastic part instantaneously moves from the intersection of the first bending and the inclined section to the supporting point with the closest distance to the elastic part (such as the supporting top or the second bending part), and the return force instantaneously decreases. Therefore, the air gap L3 between the return spring leaf and the armature may be too large, and the case that the return force is smaller than the electromagnetic suction force during the release of the armature occurs, so that the armature cannot be reliably released. Please refer to Figures 1-8 As shown in the figure, the balanced force type electromagnetic relay of the application comprises a base 4, a magnetic circuit part 5, a contact part 6 and two supporting frames 3 vertically arranged on the base. The magnetic circuit part 5 is located between the two supporting frames 3, and the armature 51 of the magnetic circuit part is installed in the form of a seesaw. At least one supporting frame 3 is provided with the return spring structure as described above, and the other end of the elastic part 11 is matched below one end of the armature 51, so that the armature 51 and the return spring leaf 1 have an air gap. Specifically, the two supporting frames 3 are respectively provided with one return spring structure, so as to ensure that the armature 51 is symmetrically stressed and rotates flexibly.

[0038] In the embodiment, the fixing pieces 22 on the restoring spring structures are respectively welded at appropriate positions of the corresponding support frames 3. In this way, the other ends of the elastic parts 11 of the two restoring spring pieces 1 are jointly fitted below the same end of the armature 51.

[0039] The structure and working principle of the restoring spring structure of the balanced force type electromagnetic relay of the present application are described in the foregoing description, and will not be repeated here.

[0040] The uninvolved parts of the restoring spring structure and the balanced force type electromagnetic relay of the present application are the same as or can be realized by using the prior art.

[0041] The above embodiment is only used to further illustrate the restoring spring structure and the balanced force type electromagnetic relay of the present application, but the present application is not limited to the embodiment, and any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment all fall within the protection scope of the technical scheme of the present application.

Claims

1. A restoring spring structure comprising a restoring spring sheet, the restoring spring sheet comprising an elastic part and a connecting part, one end of the elastic part being integrally formed with the connecting part, the other end of the elastic part extending away from the connecting part and being used to assist the armature reset of a balance force type electromagnetic relay when the coil is de-energized; the elastic part having an inclined section between the two ends, the high end of the inclined section being away from the connecting part; characterized in that: The supporting top is located on the same side of the connecting part as the other end of the elastic part, and the end of the supporting top opposite to the connecting part abuts against the surface of the inclined section facing the armature to form a pre-deformation of the elastic part in a direction away from the armature, so as to provide a larger idle stroke between the armature and the return spring of the balanced force electromagnetic relay. The inclined section is sequentially provided with a first inclined section and a second inclined section from the low end to the high end of the inclined section, and the inclination of the first inclined section is smaller than that of the second inclined section.

2. The reed structure of claim 1, wherein: The two ends of the elastic part are located on the opposite sides of the connecting part, and the connecting part is located above the inclined section; the first bending part is arranged between the one end of the elastic part and the inclined section, and the first bending part is in the form of a circular arc with the center towards the side where the inclined section is located; and the other end of the elastic part is bent downward into a hook shape.

3. The reed structure according to claim 1 or 2, characterized in that: The second bending part is arranged on the inclined section, close to the contact position of the inclined section and the supporting top, and the second bending part is located between the one end of the elastic part and the contact position, or the second bending part is located between the other end of the elastic part and the contact position; the second bending part is a bending line in the width direction of the elastic part, which divides the inclined section into the first inclined section and the second inclined section.

4. The reed structure of claim 1, wherein: The supporting top is in the form of a flat plate.

5. The reed structure of claim 1, wherein: The elastic part is designed along the material grain direction, and the material of the return spring is stainless steel.

6. The reed structure of claim 1 or 2 or 4 or 5, wherein: The transition sheet is fixedly connected to the upper surface or the lower surface of the connecting part, and the supporting top is arranged on the transition sheet; or the supporting top is integrally formed with the connecting part, or the supporting top is integrally formed on a fixed part which is used for fixedly connecting with the connecting part and is integrally formed on the supporting frame of the balanced force electromagnetic relay.

7. The reed structure of claim 6, wherein: The supporting top is integrally formed with the transition sheet; the overall piece formed by the supporting top and the transition sheet has a convex shape in the four surrounding contours, and the supporting top corresponds to the narrow part of the convex shape.

8. The reed structure of claim 6, wherein: The transition sheet is fixedly welded with the connecting part, and the transition sheet is provided with two welding brackets which are arranged along the width direction of the elastic part, and the distance between the two welding brackets is greater than the width of the elastic part.

9. The reed structure of claim 6, wherein: The transition sheet is provided with a fixed sheet which is used for fixedly connecting with the supporting frame of the balanced force electromagnetic relay; the fixed sheet is integrally formed with the transition sheet, and the two are perpendicular to each other; and the fixed sheet is provided with a welding rib.

10. A balanced force electromagnetic relay comprising two support frames and a magnetic circuit portion located between the two support frames, the armature of the magnetic circuit portion being mounted in a seesaw form; characterized in that: At least one supporting frame is provided with the return spring structure as claimed in any one of claims 1-9, and the other end of the elastic part is fitted below one end of the armature.

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