A balanced force sealed electromagnetic relay

Abstract

The present invention relates to a balanced force sealed electromagnetic relay, comprising an armature, a first yoke, a second yoke and a third yoke of a magnetic circuit part. When the balanced force sealed electromagnetic relay is in an attracted or released state, the armature switches to contact and fit with the second yoke or the third yoke respectively. The main body of the second yoke is roughly a straight sheet structure. The end of the second yoke relatively close to the armature uses its thickness section as a contact plane for abutting with the armature. The armature is a sheet structure with an obtuse angle bend. The contact plane can be realized by a precision cutting process, which can effectively improve the smoothness and prevent the generation of powder by collision between the armature and the second yoke. The sheet plane of the armature abuts and fits with the contact plane of the second yoke, so that the fitting area of ​​the armature and the second yoke is reduced, which can reduce the holding force of the armature in the excited state and help release the armature.

Description

Technical Field

[0001] The invention relates to a balanced force sealed electromagnetic relay, and in particular to an improvement of the yoke and armature structures thereof. Background Art

[0002] Balanced force sealed electromagnetic relays have excellent environmental resistance due to the same armature holding force and contact pressure in both energized and de-energized states. Figure 1-3 As shown, the magnetic circuit portion of the existing balanced force sealed electromagnetic relay (such as US3484729A and CN209729821U) includes an iron core, a coil, a magnetic steel, an armature 4', and a first yoke 1' on one side and a second yoke 2' and a third yoke 3' on the other side. The armature 4' is rotatably arranged between the second yoke 2' and the third yoke 3' and has a rotating shaft. The first yoke 1' always keeps in contact with the armature 4'. The armature 4' bends at a position corresponding to its rotating shaft, so that it can smoothly swing up and down between the second yoke 2' and the third yoke 3' to switch the contact object. When the relay is in the energized state, the armature 4' is in contact with the second yoke 2'. When the relay is in the released state (i.e. Figure 1 In the situation shown, the armature 4' is in close contact with the third yoke 3'. In the prior art, to meet the design requirements for the attraction-reaction coordination between the armature 4' and the second yoke 2' and ensure reliable contact and fit between the armature 4' and the second yoke 2', the second yoke 2' is formed into an L-shaped bent structure. A bent portion 41' is also provided at one end of the armature 4' to form a curved groove that matches the bend angle 21' of the second yoke 2'. When the relay is in the closed state, the curved groove structure on the armature 4' is in close contact with the bend angle 21' of the second yoke 2', thereby ensuring a large contact area between the two. On the other hand, in order to meet the design requirements of the suction and reaction force coordination between the armature 4' and the third yoke 3', the third yoke 3' is bent at an angle to match the bent portion 41' of the armature 4', ensuring the fitting area between the third yoke 3' and the armature 4' in the released state.

[0003] However, in the conventional structure described above, the second yoke 2' is L-shaped, resulting in a relatively rough surface at the bend corner 21'. After repeated collisions and contact between the armature 4' and the second yoke 2', powder is easily formed on the surface of the bend corner 21', resulting in significant variations in the relay's release voltage. Furthermore, this structure requires a secondary bending process for the armature 4', resulting in low manufacturing efficiency and high costs.

[0004] Furthermore, since the contact area between the armature 4' and the second yoke 2' is relatively large, the second yoke 2' exerts a relatively strong holding force on the armature 4', making it difficult for the armature 4' to separate from the second yoke 2'. Therefore, the prior art typically incorporates a return spring connected to the armature 4'. When the armature 4' swings toward the second yoke 2', the return spring accumulates energy and generates an elastic force. When the relay switches to the released state, the elastic force of the return spring assists in releasing the armature 4'. However, on the other hand, during the swinging of the armature 4' toward the second yoke 2' (i.e., during the relay closing process), the elastic deformation of the return spring must also be overcome. This slows the closing movement of the armature 4', and the disconnection speed of the NC contact group driven by the armature is correspondingly slowed. At the moment of NC contact disconnection, the arcing time is prolonged, and contact erosion is aggravated, failing to guarantee the long life of the relay. Summary of the Invention

[0005] Therefore, in order to solve the above problems, the present invention proposes a balanced force sealed electromagnetic relay with optimized structure.

[0006] The present invention is implemented by the following technical solutions:

[0007] The present invention proposes a balanced force sealed electromagnetic relay, including an armature, a first yoke, a second yoke and a third yoke in a magnetic circuit portion. The armature is rotatably arranged and has a rotating shaft. When the balanced force sealed electromagnetic relay is in an attracted or released state, the armature switches to contact and fit with the second yoke or the third yoke respectively. The main body of the second yoke is roughly a flat sheet structure, and the end of the second yoke relatively close to the armature uses its thickness section as a contact plane for abutting with the armature.

[0008] Among them, based on manufacturing and cost considerations, and in order to weaken the holding force of the armature in the attracted state, in one embodiment, the armature is a sheet structure that is bent at an obtuse angle at a position roughly corresponding to the position of the rotating shaft, and includes a first wing for cooperating with the first yoke and a second wing for cooperating with the second yoke or the third yoke, and the armature abuts the contact plane with the upper surface of its second wing to achieve the contact fit.

[0009] In order to improve the reliability of the fit between the armature and the third yoke, in one embodiment, the lower surface of the second wing of the armature is preferably provided with a chamfered surface for fitting with the third yoke.

[0010] In order to weaken the holding force of the armature in the excited state and reduce the dependence of the armature on the restoring spring, in one embodiment, the second wing cooperates with the second yoke or the third yoke at its end, and the end of the second wing is a convergent structure to reduce the contact area between the second wing and the second yoke.

[0011] In one embodiment, the second yoke is preferably provided with a bracket fixing portion at both ends of the contact plane for fixing a movable bracket for installing the armature, and the second wing of the armature is provided with a notch at a position corresponding to the bracket fixing portion, so that the end of the second wing is in a converged structure through the notch.

[0012] Among them, based on production and manufacturing considerations, in one embodiment, it is preferred that the notch is rectangular, so that the armature is a roughly convex-shaped structure.

[0013] Among them, based on manufacturing and installation considerations, it is preferred that the bracket fixing portion is formed integrally by bending the extended sections of the sheet structure of the main body of the second yoke at both ends of the contact plane into an L shape.

[0014] Among them, based on the flatness and consistency of the appearance, in one embodiment, it is preferred that the two bracket fixing parts are retracted toward the central position of the main body of the second yoke to form an installation slot for the movable bracket so that the movable bracket does not protrude to the outside of the second yoke.

[0015] Among them, in order to further reduce the attraction surface between the second yoke and the armature to weaken the holding force of the armature in the attracted state, in one embodiment, the lower end of the main body of the second yoke is preferably an isosceles trapezoidal structure to narrow the contact plane, thereby reducing the contact surface between the second wing and the second yoke.

[0016] In order to maintain the smoothness of the contact plane, in one embodiment, the contact plane is preferably formed by performing a precision cutting process on a metal plate with a straight sheet structure.

[0017] The present invention has the following beneficial effects:

[0018] 1. Compared to the prior art, the second yoke body of this invention is a flat sheet-like structure. A contact plane is cut through its thickness to form contact with the armature. This contact plane can be achieved through a precision cutting process, effectively improving the finish and preventing the generation of collision powder.

[0019] 2. The armature itself has a simple structure and can be obtained by bending it once, resulting in high part precision, high production efficiency and low cost;

[0020] 3. The armature's flat surface abuts against the contact surface of the second yoke, reducing the contact area between the armature and the second yoke. This can reduce the holding force of the armature in the energized state, facilitate armature release, and thus reduce reliance on the restoring reaction force provided by the restoring spring. When the armature is less hindered by the elastic force of the restoring spring during the attraction process, the breaking speed is increased, the arcing time of the contacts is reduced, and contact erosion is slowed down, thereby ensuring the long life of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the magnetic circuit portion of a balanced force sealed electromagnetic relay in the prior art;

[0022] Figure 2 is a schematic diagram of the second yoke in the prior art;

[0023] Figure 3 It is a schematic diagram of an armature in the prior art;

[0024] Figure 4 1 is a perspective schematic diagram of a balanced force sealed electromagnetic relay in an embodiment (angle 1);

[0025] Figure 5 This is an exploded view of the structure of the balanced force sealed electromagnetic relay in the embodiment;

[0026] Figure 6 Schematic diagram of the magnetic circuit portion of a balanced force sealed electromagnetic relay in an embodiment;

[0027] Figure 7 is a schematic diagram of the second yoke in the embodiment;

[0028] Figure 8 1 is a schematic diagram of the armature in the embodiment (angle 1);

[0029] Figure 9 Schematic diagram of the armature in the embodiment (angle 2);

[0030] Figure 10 1. It is a three-dimensional assembly diagram of the magnetic circuit portion of the balanced force sealed electromagnetic relay in the embodiment (excluding the third yoke);

[0031] Figure 11 1. It is a perspective exploded view of the magnetic circuit portion of the balanced force sealed electromagnetic relay in the embodiment (excluding the third yoke);

[0032] Figure 12 is a cross-sectional view of the magnetic circuit portion of a balanced force sealed electromagnetic relay in an embodiment;

[0033] Figure 13 3D schematic diagram of the balanced force sealed electromagnetic relay in the embodiment (angle 2). DETAILED DESCRIPTION

[0034] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0035] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0036] See Figure 4-6 As shown in FIG. 1 , as a preferred embodiment of the present invention, a balanced force sealed electromagnetic relay is provided, comprising a magnetic circuit portion 10 and a contact portion 20, wherein the magnetic circuit portion 10 comprises an iron core, a coil, a magnetic steel, a first yoke 1, a second yoke 2, a third yoke 3 and an armature 4. Figure 7 The main body 21 of the second yoke 2 is a generally flat sheet-like structure. Its lower end, closer to the armature 4, has a thickness section with a contact surface 211. Bracket fixing portions 22 are provided at both ends of the contact surface 211. These bracket fixing portions 22 are used to securely mount the movable bracket 5 to which the armature 4 is mounted. The armature 4 is rotatably connected to the movable bracket 5 and has a rotating shaft, enabling the armature 4 to swing to switch contact objects.

[0037] The bracket fixing portion 22 is formed integrally by bending the extended sections of the sheet-like structure of the main body 21 of the second yoke 2 at both ends of the contact plane 211 into an L-shape, thus simplifying the manufacturing process. Both bracket fixing portions 22 are recessed toward the center of the main body 21 to form a mounting slot 23. The movable bracket 5 of the armature 4 is fixedly mounted within this mounting slot 23, without protruding outward from the second yoke 2, thereby maintaining consistency and smoothness with the appearance of the second yoke 2. Furthermore, beveled grooves 24 are provided at both ends of the contact plane 211, giving the lower end of the main body 21 a roughly isosceles trapezoidal sheet structure. By punching out the beveled grooves 24, the contact plane 211 is further narrowed, thereby further reducing the engaging surface between the second yoke 2 and the armature 4 and weakening the retaining force of the armature 4 in the energized state.

[0038] like Figure 8-9The armature 4 is a sheet-like structure bent at an obtuse angle, roughly corresponding to its axis of rotation. It includes a first wing 41 for mating with the first yoke 1 and a second wing 42 for mating with the second yoke 2 or the third yoke 3. The second wing 42 has two notches 422 at positions corresponding to the bracket fixing portion 22, resulting in a converged structure at the ends of the second wing 42. The second wing 42 is mated with the second yoke 2 or the third yoke 3 at its ends. Similar to the inclined slot 24, the notches 422 further reduce the width of the armature 4 and the contact surface between the second yoke 2 and the armature 4. In actual production, the size and shape of the notches 422 and the inclined slot 24 can be flexibly designed according to the required suction and reaction force coordination between the second yoke 2 and the armature 4. In addition, the notches 422 correspond to the position of the bracket fixing portion 22, so they can also avoid the bracket fixing portion 22. In this embodiment, the notches 422 are rectangular to facilitate manufacturing and processing, resulting in the armature 4 having a roughly convex structure. In addition, in order to fit the third yoke 3, the lower surface of the second wing 42 of the armature 4 is provided with a chamfered surface 421 at the contact end thereof to match the bending angle of the third yoke 3. Figure 6 The angle of the beveled surface 421 and the third yoke 3 is roughly aligned, thereby improving the contact fit between the armature 4 and the third yoke 3 in the released state of the relay and improving the holding force of the armature 4 in the released state.

[0039] like Figure 10-12 When the relay of this embodiment is in the closed state, the straight second wing 42 of the armature 4 abuts and mates with the straight contact plane 211 of the second yoke 2. Compared to the prior art, which uses an angled contact and mate method, the contact plane 211 of the second yoke 2 in this embodiment is cut along its thickness, which can be achieved through a precision cutting process, effectively improving the finish. Tests have shown that the armature 4 can be subjected to one million collisions and mates with the contact plane 211 without generating powder, thereby reducing the variation in the relay release voltage. Furthermore, the armature 4 itself has a simple structure. Unlike the prior art, its second wing 42 is not bent, so the armature 4 only needs to be bent once, which improves production efficiency and reduces costs. Furthermore, the armature 4 is in contact with the contact plane 211 of the second yoke 2, so that the contact area between the armature 4 and the second yoke 2 is reduced, which can reduce the holding force of the armature 4 in the excited state, help release the armature 4, and thus reduce the pressure on the return spring 6 (see Figure 5 and Figure 13The restoring spring 6 is fixedly connected to the bracket and acts on the armature 4), and relies on the restoring reaction force provided by the armature 4. Therefore, the restoring spring 6 can be made of a material with a smaller elastic coefficient. When the armature 4 is less hindered by the elastic force of the restoring spring 6 during the attraction process, the breaking speed is improved, the arcing time of the contacts can be reduced, the contact erosion is slowed down, and the long life requirement of the relay can be guaranteed.

[0040] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it should be understood by those skilled in the art that various changes in form and details made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims fall within the scope of protection of the present invention.

Claims

1. A balanced-force sealed electromagnetic relay comprising an armature, a first yoke, a second yoke, and a third yoke as part of a magnetic circuit; the armature being rotatably disposed and having a rotating shaft; and when the balanced-force sealed electromagnetic relay is in an engaged or released state, the armature switches to contact and engage with the second yoke or the third yoke, respectively. The invention is characterized in that: The main body of the second yoke is a flat sheet structure, including a contact plane abutting the armature and a bracket fixing part for fixing the movable bracket of the armature, the contact plane is a thickness section of the second yoke at one end relatively close to the armature, and the bracket fixing part is an extension section integrally formed on the main body of the second yoke and located at both ends of the contact plane; the armature includes a first wing for cooperating with the first yoke and a second wing for cooperating with the second yoke or the third yoke, the second wing cooperates with the second yoke or the third yoke with its end portion, and the second wing of the armature is provided with a notch at a position corresponding to the bracket fixing part, and the notch makes the end of the second wing present a convergent structure to reduce the contact area between the second wing and the second yoke.

2. The balanced force sealed electromagnetic relay according to claim 1, characterized in that: The armature is a sheet-like structure that is bent at an obtuse angle at a position roughly corresponding to the rotating shaft. The upper surface of the second wing of the armature abuts against the contact plane to achieve the contact fit.

3. The balanced force sealed electromagnetic relay according to claim 2, characterized in that: The lower surface of the second wing of the armature is provided with an oblique cut surface for fitting with the third yoke.

4. The balanced force sealed electromagnetic relay according to claim 1, characterized in that: The notch is rectangular, so that the armature is a substantially convex-shaped structure.

5. The balanced force sealed electromagnetic relay according to claim 1, characterized in that: The bracket fixing portion is bent in an L shape.

6. The balanced force sealed electromagnetic relay according to claim 1, characterized in that: The two bracket fixing portions are both retracted toward the center of the main body of the second yoke to form a mounting slot for the movable bracket so that the movable bracket does not protrude toward the outside of the second yoke.

7. The balanced force sealed electromagnetic relay according to claim 2, characterized in that: The lower end of the main body of the second yoke is in an isosceles trapezoidal structure to narrow the contact plane, thereby reducing the contact surface between the second wing and the second yoke.

8. The balanced force sealed electromagnetic relay according to claim 1, characterized in that: The contact plane is formed by performing a precision cutting process on a metal plate having a flat sheet structure.

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