A normally open clap-type electromagnetic relay

Abstract

The present invention discloses a normally open type snap-on electromagnetic relay, comprising a coil frame, an iron core, a movable spring armature component, a normally open static spring piece, and a positioning piece; the normally open static spring piece and the positioning piece are respectively inserted into the coil frame so that the stop portion of the positioning piece and the portion of the normally open static spring piece fixed with the static contact are fitted on the coil frame with a vertical gap; the portion of the movable spring piece fixed with the movable contact downwardly extends along the length direction of the movable spring piece to the gap fitting position between the normally open static spring piece and the positioning piece; the stop portion of the positioning piece is provided with a protrusion protruding toward the movable spring piece at a position corresponding to the movable contact, and the protrusion is provided along the width direction of the movable spring piece so that the stop portion of the positioning piece and the surface of the movable spring piece facing away from the movable contact are in line-surface contact when in contact. The present invention enables line-surface contact between the positioning piece and the movable spring piece, thereby improving the contact stability between the movable spring piece and the positioning piece and ensuring the consistency of the contact gap.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a normally open clap-type electromagnetic relay. Background Art

[0002] A relay is an electronic control device that has a control system (also called an input circuit) and a controlled system (also called an output circuit). It is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit. A snap-on electromagnetic relay in the prior art is to set the axis of the core hole of the coil frame vertically, the pole surface of the core is set at the upper end of the coil frame, and the armature in the movable spring armature component fits above the pole surface of the core. The movable spring is usually bent into an L-shape, and one side of the L-shape of the movable spring is fixed to the armature. A moving contact is installed near the end of one side of the L-shape of the movable spring, and the other side of the L-shape of the movable spring is fixed to the yoke. When the coil is energized, the armature moves toward the pole surface of the core, and drives the moving contact of the movable spring to move until it contacts the normally open static contact at the corresponding position of the moving contact and realizes Overtravel: Since the movable spring armature component is flapping toward the coil frame, the normally open static spring is usually installed in an extension of the upper flange of the coil frame extending to the side. This normally open snap-fit ​​electromagnetic relay, due to the lack of the normally closed static spring to restrict the movable spring, usually requires a positioning piece to solve the problem of uncontrollable contact gap and operating voltage. The positioning piece is usually installed on the extension of the upper flange of the coil frame and is located above the normally open static contact. The movable spring piece corresponding to the movable contact position is located between the normally open static contact and the positioning piece. When the coil is not energized, the movable spring piece in this part leans against the positioning piece. In this normally open snap-fit ​​electromagnetic relay of the prior art, the movable spring piece and the positioning piece are in surface-to-surface contact, making the contact position of the movable spring piece and the positioning piece difficult to control. Moreover, because the movable spring has a certain inclination relative to the horizontal plane after disconnection, the contact position of the movable spring piece and the positioning piece is different, and the contact gap between the movable contact and the static contact is also different, making it difficult to ensure the consistency of the contact gap. Summary of the Invention

[0003] The object of the present invention is to overcome the shortcomings of the prior art and provide a normally open clap-type electromagnetic relay. Through structural improvement, the positioning piece and the movable spring piece are in line and surface contact, thereby improving the contact stability between the movable spring piece and the positioning piece and ensuring the consistency of the contact gap.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a normally open type snap-on electromagnetic relay, including a coil frame, an iron core, a movable spring armature component, a normally open static spring piece and a positioning piece; the iron core is fitted in the iron core hole of the coil frame and the axis of the iron core hole is arranged vertically, and the pole surface of the iron core is arranged at the upper end of the coil frame; the normally open static spring piece and the positioning piece are respectively inserted into the coil frame and the shift portion of the positioning piece and the portion of the normally open static spring piece fixed with the static contact are fitted on the upper flange of the coil frame with a vertical gap; the movable spring armature component is fitted in the iron core hole of the coil frame and the axis of the iron core hole is arranged vertically, and the pole surface of the iron core is arranged at the upper end of the coil frame; the normally open static spring piece and the positioning piece are respectively inserted into the coil frame and the shift portion of the positioning piece and the portion of the normally open static spring piece fixed with the static contact are fitted on the upper flange of the coil frame with a vertical gap; The downwardly fixed portion of the movable spring piece to which the armature is matched above the pole surface of the iron core, and the downwardly fixed portion of the movable spring piece to which the movable contact is extended from the portion to which the armature is fixed along the length direction of the movable spring piece to the clearance fit between the normally open static spring piece and the positioning piece; the blocking portion of the positioning piece is provided with a protrusion protruding toward the movable spring piece at a position corresponding to the movable contact, and the protrusion is arranged along the width direction of the movable spring piece, so that the blocking portion of the positioning piece is in line and surface contact with the side of the movable spring piece facing away from the movable contact when in contact.

[0005] When the stop portion of the positioning piece contacts the side of the movable spring piece facing away from the movable contact, the contact line between the moving spring piece and the surface is close to or directly opposite to the middle position of the movable contact.

[0006] The protruding portion of the positioning piece is formed by striking or bending the blocking portion of the positioning piece into a V-shaped downwardly protruding shape in cross section, and the bottom end line of the V-shape is arranged along the width direction of the movable spring piece, so that the bottom end of the V-shaped downwardly protruding shape of the positioning piece is in line-surface contact with the side of the movable spring piece facing away from the movable contact point.

[0007] The protruding portion of the positioning piece is formed by hitting or bending at two places in the gear portion of the positioning piece into a double V-shaped downward protruding shape in cross section, and the bottom end lines of the two V-shapes are arranged along the width direction of the movable spring piece. Among the two V-shaped downward protruding shapes, the bottom end of the V-shaped downward protruding shape close to the outer end is lower than the bottom end of the V-shaped downward protruding shape close to the inner end, so that the bottom ends of the two V-shaped downward protruding shapes of the positioning piece are in line and surface contact twice with the side of the movable spring piece facing away from the moving contact.

[0008] In the V-shaped downwardly protruding shape, the bottom of the V-shaped downwardly protruding shape is in an arc shape.

[0009] The protruding portion of the positioning piece is formed by bending the end of the shifting portion of the positioning piece downward and inward into a laminated shape, and the bending line of the laminate is arranged along the width direction of the movable spring piece so that the bottom of the laminated part is in line-surface contact with the side of the movable spring piece facing away from the movable contact point.

[0010] The positioning piece is L-shaped with a bending portion, and the bending line of the bending portion is arranged along the length direction of the movable spring piece; the vertical side of the L-shape of the positioning piece is inserted into the coil frame, and the horizontal side of the L-shape of the positioning piece is adapted to be above the upper flange of the coil frame; the horizontal side of the L-shape of the positioning piece includes the blocking portion and the connecting section between the blocking portion and the bending portion; a first notch is also provided between the portion of the blocking portion with the protrusion and the bending portion.

[0011] In the first notch, a second notch is further provided at the junction of the connecting section and the shifting portion.

[0012] In the bending portion of the positioning piece, a cut mark is provided on the outer side of the bending portion, and a convex rib is formed on the inner side of the bending portion.

[0013] A convex burl is provided on an L-shaped vertical side of the positioning piece for interference fit with the slot of the coil frame. The upper section of the convex burl is in a straight surface shape, and the lower section of the convex burl is in an inclined surface shape.

[0014] The movable spring is bent into an L-shape by a bending portion, a vertical side of the L-shape of the movable spring is fixed to the yoke of the relay, and a horizontal side of the L-shape of the movable spring includes a portion of the movable spring to which the armature is fixed downward and a portion of the movable spring to which the movable contact is fixed downward, and the portion of the movable spring to which the armature is fixed downward and the portion of the movable spring to which the movable contact is fixed downward are connected by a downward first bend and an upward second bend.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention employs a protrusion on the positioning piece, corresponding to the position of the moving contact, extending toward the moving spring. This protrusion is arranged along the width of the moving spring. This structure enables linear and surface contact between the positioning piece and the moving spring, thereby improving contact stability between the moving spring and positioning piece and ensuring consistent contact gap.

[0017] 2. The present invention employs a method in which the line-to-surface contact point of the positioning piece's stop portion in contact with the side of the movable spring facing away from the movable contact is located near or directly in the middle of the movable contact. This structure of the present invention, by designing the contact point between the positioning piece's stop portion and the side of the movable spring facing away from the movable contact to be located near or directly in the middle of the movable contact, can prevent deformation of the movable spring (the movable spring at the contact point is relatively harder), which would increase the air gap between the armature and the core and lead to a mismatch in the suction and reaction forces. At the same time, it can also achieve the effect of stable control of the contact gap.

[0018] 3. The present invention adopts a V-shaped downwardly protruding shape of the positioning piece, and the bottom of the V-shaped downwardly protruding shape is in an arc shape. This structure of the present invention can ensure that the positioning piece is in constant contact with the movable spring piece with a certain slope by utilizing the arc shape of the protruding portion of the positioning piece.

[0019] 4. The present invention employs a first notch provided between the portion of the stopper portion having the protrusion and the bent portion, and a second notch provided within the first notch at the junction of the connecting section and the stopper portion. This structure of the present invention allows the downwardly protruding V-shaped cross-section to be formed by striking or bending the stopper portion of the positioning piece.

[0020] 5. The present invention employs a cutout on the outer side of the bent portion of the positioning plate and a rib on the inner side of the bent portion. This structure, by forming ribs on the cutouts in the bent portion, improves dimensional stability after bending and prevents the positioning plate from plastically deforming when subjected to the impact of multiple releases of the dynamic spring, thereby ensuring the stability of the relay contact gap and travel, and therefore the stability of the operating voltage.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the normally open clap-type electromagnetic relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the exploded three-dimensional structure of the first embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the positioning piece insertion of the first embodiment of the present invention;

[0024] Figure 3 1 is a schematic diagram of the three-dimensional structure of the positioning piece according to the first embodiment of the present invention;

[0025] Figure 4 This is a front view of the positioning piece of the first embodiment of the present invention;

[0026] Figure 5 yes Figure 4 A magnified schematic diagram of part A in FIG;

[0027] Figure 6 is a top view of the positioning piece according to the first embodiment of the present invention;

[0028] Figure 7 is a side view of a positioning piece according to embodiment 1 of the present invention;

[0029] Figure 8 yes Figure 7 A magnified schematic diagram of part B in FIG.

[0030] Figure 9 This is a schematic diagram of the structure of adjusting the contact gap using a positioning piece in the first embodiment of the present invention. Figure 1 ;

[0031] Figure 10 yes Figure 9 A magnified schematic diagram of part C in FIG;

[0032] Figure 11 This is a schematic diagram of the structure of adjusting the contact gap using a positioning piece in the first embodiment of the present invention. Figure 2 ;

[0033] Figure 12 yes Figure 11 A magnified schematic diagram of part D in FIG.

[0034] Figure 13 is a side view of a positioning piece according to a second embodiment of the present invention;

[0035] Figure 14 yes Figure 13 A magnified schematic diagram of part E in FIG;

[0036] Figure 15 is a structural cross-sectional view of embodiment 2 of the present invention;

[0037] Figure 16 yes Figure 15 A magnified schematic diagram of part F in FIG.

[0038] Figure 17 is a side view of a positioning piece according to a third embodiment of the present invention;

[0039] Figure 18 yes Figure 17 A magnified schematic diagram of the G portion in FIG;

[0040] Figure 19 It is a structural cross-sectional view of embodiment 3 of the present invention. DETAILED DESCRIPTION

[0041] Example 1

[0042] See also Figures 1 to 12As shown, a normally open type snap-on electromagnetic relay of the present invention includes a housing 10, a coil frame 1, an iron core 2, a dynamic spring armature component 3, a normally open static spring piece 4 and a positioning piece 5; the iron core 2 is fitted in the iron core hole 11 of the coil frame 1 and the axis of the iron core hole 11 is vertically arranged, and the pole surface 21 of the iron core 2 is arranged at the upper end of the coil frame 1; it should be noted that, in the present invention, the definition of upper, lower and other directions in the technical features only represents the relative position relationship between components or between structures in components. For example, when the iron core hole of the coil frame 1 is vertically arranged, the pole surface of the iron core 2 is located at the upper end of the coil frame, and when the iron core hole of the coil frame is horizontally arranged, the pole surface of the iron core 2 is located at the left end or right end of the coil frame 1. The normally open static spring piece 4 and the positioning piece 5 are respectively inserted into the coil frame 1 so that the shift portion 51 of the positioning piece 5 and the portion 42 of the normally open static spring piece 4 fixed with the static contact 41 are fitted on the upper flange 12 of the coil frame 1 with a gap between them; the portion 311 of the movable spring piece 31 in the movable spring armature component 3, where the armature 32 is fixed downward, matches above the pole surface 21 of the iron core 2, and the portion 312 of the movable spring piece 31 where the movable contact 33 is fixed downward is fixed by the said fixed The portion 311 of the armature 32 extends along the length direction of the movable spring piece 31 to the clearance fit between the normally open static spring piece 4 and the positioning piece 5; the stop portion 51 of the positioning piece 5 is provided with a protrusion 6 protruding toward the movable spring piece 31 at a position corresponding to the movable contact, and the protrusion 6 is arranged along the width direction of the movable spring piece 31, so that the stop portion 51 of the positioning piece 5 and the surface of the movable spring piece 31 facing away from the movable contact 33 are in line and surface contact when in contact.

[0043] In this embodiment, when the stopper portion 51 of the positioning piece 5 contacts the surface of the movable spring piece 31 facing away from the movable contact, the contact line and the surface contact are close to or facing the middle position of the movable contact 33 .

[0044] In this embodiment, the protrusion 6 of the positioning piece 5 is formed by hitting or bending the blocking portion 51 of the positioning piece 5 into a V-shaped downwardly protruding shape 61 with a cross-section, and the bottom end line of the V-shape is arranged along the width direction of the dynamic spring piece 31, so that the bottom end of the V-shaped downwardly protruding shape 61 of the positioning piece 6 is in line-surface contact with the side of the dynamic spring piece 31 facing away from the moving contact.

[0045] In this embodiment, in the V-shaped downwardly protruding shape 61 , the bottom of the V-shaped downwardly protruding shape 61 is in an arc shape 611 .

[0046] In this embodiment, the positioning piece 5 is L-shaped with a bending portion 52, and the bending line of the bending portion 52 is arranged along the length direction of the movable spring piece 31; the vertical side 53 of the L-shape of the positioning piece 5 is inserted on the coil frame 1, and the horizontal side 54 of the L-shape of the positioning piece 5 is adapted to be above the upper flange 12 of the coil frame 1; the horizontal side 54 of the L-shape of the positioning piece 5 includes the blocking portion 51 and the connecting section 55 between the blocking portion and the bending portion; a first notch 56 is also provided between the portion 511 of the blocking portion 51 having the protrusion 6 and the bending portion 52.

[0047] In this embodiment, a second notch 57 is provided in the first notch 56 at the junction of the connecting section 55 and the stopper portion 51. The first notch 56 is provided to form the stopper portion 51 of the positioning piece 5 and to facilitate the provision of the protrusion 6 with a V-shaped downwardly protruding shape 61 on the stopper portion 51. The second notch 57 is provided to prevent tearing at the connection between the protrusion and the cantilever when the protrusion is bent, thereby preventing the generation of metal chips.

[0048] In this embodiment, a cut mark 521 is provided on the outer side of the bent portion 52 of the positioning piece 5 , and a convex rib 522 is formed on the inner side of the bent portion 52 .

[0049] In this embodiment, the L-shaped vertical side 53 of the positioning piece 5 is provided with a convex bulge 531 for interference fit with the slot 13 of the coil frame 1. The upper section 532 of the convex bulge 531 is in a straight shape, and the lower section 533 of the convex bulge 531 is in an inclined shape. The slot 13 of the coil frame 1 is provided on both the upper flange 12 and the lower flange 14 of the coil frame 1. Figure 5 As shown, the lower section 533 of the convex bud 531 has a certain tilt angle α, which allows the positioning piece 5 pin to be inserted into the coil frame 1 more easily; the upper section 532 is a square with straight surfaces, which can solve the problem of rebound after the pin is inserted into the coil frame 1.

[0050] In this embodiment, the movable spring 31 is bent into an L-shape by a bend 313. A vertical side 314 of the L-shape of the movable spring is fixed to the yoke 71 of the relay. A horizontal side 315 of the L-shape of the movable spring 31 includes a downwardly fixed portion 311 of the movable spring to which the armature is fixed and a downwardly fixed portion 312 of the movable spring to which the moving contact is fixed. The downwardly fixed portion 311 of the movable spring 31 and the downwardly fixed portion 312 of the movable spring 31 are connected by a downwardly facing first bend 316 and an upwardly facing second bend 317.

[0051] See also Figures 8 to 12As shown, the present invention is to set a protrusion 6 with a V-shaped downward protrusion shape 61 on the positioning piece 5. The bottom of the V-shaped downward protrusion shape 61 of the protrusion 6 is in an arc shape 611, which always ensures line-to-surface contact with the movable spring 31 with a certain inclination angle β, thereby ensuring contact stability. By controlling the size a on the positioning piece 5, it can be ensured that the bottom end position of the V-shaped downward protrusion shape 61 is located above the movable contact 33. During the downward pressing process of the positioning piece 5, the movable spring 31 will initially contact the bottom of the V-shaped downward protrusion shape 61 in the arc shape 611 (the contact position is shown in FIG. Figure 10 ), the contact position will slide when the positioning piece 5 is pressed down, and the contact gap (size b) will be reduced until the contact gap reaches the required value, and then the pressure is stopped ( Figure 12 Designing the bottom of the V-shaped downwardly protruding shape 61 into an arc shape 611 has the following advantages: First, it can ensure stable contact with the dynamic spring having a certain inclination angle β, and even if the angle β changes during the downward pressing of the positioning piece, stable contact can be achieved; second, during the downward pressing of the positioning piece, the positioning piece 5 and the dynamic spring piece 31 slide relative to each other, and the arc-shaped design of the bottom can avoid the risk of scratching the dynamic spring during the sliding process, thereby generating metal chips; third, during the relative sliding between the bottom of the arc and the dynamic spring piece 31, the friction force is small, reducing the resistance during the downward pressing process, which is conducive to controlling the size of the contact gap.

[0052] The normally open, snap-action electromagnetic relay of the present invention employs a protrusion 6 extending toward the movable spring 31, provided on the shift portion 51 of the positioning piece 5 at a position corresponding to the movable contact 33. The protrusion 6 is arranged along the width of the movable spring 31. This structure of the present invention enables linear and surface contact between the positioning piece 5 and the movable spring 31, thereby improving the contact stability between the movable spring 31 and the positioning piece 5 and ensuring the consistency of the contact gap.

[0053] The present invention provides a positioning piece 5 at the normally closed end. The functions of the positioning piece 5 are: first, the contact gap and the stroke can be effectively controlled by pressing down the normally closed end positioning piece 5; when the contact gap and the stroke are ensured to be within a controllable range, the operating voltage of the product will have good consistency; second, it can limit the problem of the dynamic spring piece warping up significantly due to the reaction force at the bending point when the relay is released, and can effectively control the movement range of the dynamic spring to prevent the dynamic spring from directly hitting the housing due to rebound when released.

[0054] The normally open, snap-action electromagnetic relay of the present invention employs a configuration in which the line-to-surface contact point between the stopper portion 51 of the positioning piece 5 and the surface of the movable spring 31 facing away from the movable contact is located near or directly opposite the movable contact 33. This configuration of the present invention, by designing the contact point between the stopper portion 51 of the positioning piece 5 and the surface of the movable spring 31 facing away from the movable contact to be located near or directly opposite the movable contact 33, prevents deformation of the movable spring (the movable spring is relatively harder at the contact point), which would increase the air gap between the armature and the core and lead to a mismatch in the suction and reaction forces. Furthermore, it achieves stable control of the contact gap.

[0055] The normally open snap-on electromagnetic relay of the present invention utilizes a V-shaped downwardly protruding portion 61 of the positioning piece 5, wherein the bottom of the V-shaped downwardly protruding portion 61 is in an arc shape 611. This structure of the present invention utilizes the arc shape 61 of the protruding portion 6 of the positioning piece 5 to ensure constant contact with the movable spring 31 having a certain slope.

[0056] The normally open snap-action electromagnetic relay of the present invention employs a first notch 56 disposed between the portion 511 of the shift portion 5 having the protrusion 6 and the bent portion 52. Furthermore, a second notch 57 is disposed within the first notch 56 at the junction of the connecting section 55 and the shift portion 51. This structure allows the downwardly projecting protrusion 6, with a V-shaped cross-section, to be formed by striking or bending the shift portion 51 of the positioning piece 5.

[0057] The normally open snap-on electromagnetic relay of the present invention employs a cutout 521 provided on the outer side of the bent portion 52 of the positioning plate 5, and a convex rib 522 formed on the inner side of the bent portion 51, i.e., a convex rib with a triangular appearance perpendicular to the bending line is formed on the back of the cutout. This structure of the present invention, by forming the convex rib 522 on the cutout 521 of the bent portion 52, can effectively prevent the positioning plate 5 from twisting along the bending line after bending, thereby enhancing the strength of the bent portion 51 and improving the stability of the dimensions after bending; it also reduces the torsional deformation caused by the dynamic spring impacting the positioning plate 5 during release, ensuring the bending angle after multiple operations and release, thereby ensuring the stability of the relay contact gap and stroke, i.e., the stability of the operating voltage.

[0058] Example 2

[0059] See also Figures 13 to 16As shown, a normally open, snap-on electromagnetic relay according to the present invention differs from the first embodiment in the configuration of the protrusion 6 of the positioning piece 5. In this embodiment, the protrusion 6 of the positioning piece 5 is formed by bending the end of the stop portion 51 of the positioning piece 5 downwardly and inwardly into a laminated shape, with the bend line of the laminate 62 arranged along the width direction of the movable spring, so that the bottom of the bend of the laminate 62 is in line-to-surface contact with the surface of the movable spring 31 facing away from the movable contact.

[0060] In this embodiment, the protrusion 6 of the positioning plate 5 is replaced with a laminate 62 structure, with the bend being arc-shaped, achieving the same effect as in the first embodiment. The included angle γ between the movable spring 31 and the lower surface of the laminate 62 is greater than 0°, and the arc portion of the laminate 62 always achieves line-surface contact with the movable spring 31.

[0061] Example 3

[0062] See also Figures 17 to 19 As shown, a normally open type snap-on electromagnetic relay of the present invention is different from the embodiment 1 in that the protrusion 6 of the positioning piece 5 is formed by hitting or bending at two places in the shift portion 51 of the positioning piece 5 into a double V-shaped downward protruding shape 61 in cross section, which is equivalent to forming a "W" shape 63, and the bottom end lines of the two V-shaped are arranged along the width direction of the movable spring piece 31. Among the two V-shaped downward protruding shapes 61, the bottom end of the V-shaped downward protruding shape close to the outer end is lower than the bottom end of the V-shaped downward protruding shape close to the inner end, so that the bottom ends of the two V-shaped downward protruding shapes of the positioning piece are in line and surface contact twice with the side of the movable spring piece facing away from the movable contact.

[0063] The protrusion 6 of the positioning piece in this embodiment is a W-shaped structure, with a height difference c greater than 0 between the bottom surfaces of the two circular arcs. The movable spring 31 initially contacts the outermost circular arc. When the relay is released and the movable spring impacts the positioning piece, the bent portion of the movable spring deforms. At this point, the innermost circular arc of the positioning piece contacts the deformed movable spring, thereby limiting the further expansion of the movable spring's bending angle. This structure controls the range of the movable spring's bending angle, thereby mitigating irreversible plastic deformation of the bent portion.

[0064] When the movable spring 31 collides with the positioning piece 5, the movable spring 31 will also undergo a certain deformation due to the action of inertia. At this time, the movable spring 31 will contact the inner tip arc set by the positioning piece 5, thereby reducing the length of the rotating shaft. The reduction in the rotating shaft length will reduce the torque acting on the movable spring, thereby avoiding further deformation of the movable spring and the change in the contact gap caused by plastic deformation.

[0065] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the art can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A normally open snap-action electromagnetic relay, comprising a coil frame, an iron core, a movable spring armature component, a normally open static spring piece, and a positioning piece; the iron core is fitted into the core hole of the coil frame, with the axis of the core hole arranged vertically, and the pole surface of the iron core is arranged at the upper end of the coil frame; the normally open static spring piece and the positioning piece are respectively inserted into the coil frame, and the shift portion of the positioning piece and the portion of the normally open static spring piece to which the static contact is fixed are fitted on the upper flange of the coil frame with a vertical gap; the downwardly facing portion of the movable spring piece in the movable spring armature component to which the armature is fixed matches above the pole surface of the iron core, and the downwardly facing portion of the movable spring piece to which the movable contact is fixed extends from the portion to which the armature is fixed along the length direction of the movable spring piece to the gap fitting position between the normally open static spring piece and the positioning piece; characterized in that: The stop portion of the positioning piece is provided with a protrusion protruding toward the moving spring piece at a position corresponding to the moving contact, and the protrusion is provided along the width direction of the moving spring piece, so that when the stop portion of the positioning piece contacts the side of the moving spring piece facing away from the moving contact, there is line-to-surface contact; when the stop portion of the positioning piece contacts the side of the moving spring piece facing away from the moving contact, the line-to-surface contact point is close to or directly opposite the middle position of the moving contact.

2. The normally open clap-type electromagnetic relay according to claim 1, characterized in that: The protruding portion of the positioning piece is formed by striking or bending the blocking portion of the positioning piece into a V-shaped downwardly protruding shape in cross section, and the bottom end line of the V-shape is arranged along the width direction of the movable spring piece, so that the bottom end of the V-shaped downwardly protruding shape of the positioning piece is in line-surface contact with the side of the movable spring piece facing away from the movable contact point.

3. The normally open clap-type electromagnetic relay according to claim 2, characterized in that: The protruding portion of the positioning piece is formed by hitting or bending at two places in the gear portion of the positioning piece into a double V-shaped downward protruding shape in cross section, and the bottom end lines of the two V-shapes are arranged along the width direction of the movable spring piece. Among the two V-shaped downward protruding shapes, the bottom end of the V-shaped downward protruding shape close to the outer end is lower than the bottom end of the V-shaped downward protruding shape close to the inner end, so that the bottom ends of the two V-shaped downward protruding shapes of the positioning piece are in line and surface contact twice with the side of the movable spring piece facing away from the moving contact.

4. The normally open clap-type electromagnetic relay according to claim 2 or 3, characterized in that: In the V-shaped downwardly protruding shape, the bottom of the V-shaped downwardly protruding shape is in an arc shape.

5. The normally open clap-type electromagnetic relay according to claim 1, characterized in that: The protruding portion of the positioning piece is formed by bending the end of the shifting portion of the positioning piece downward and inward into a laminated shape, and the bending line of the laminate is arranged along the width direction of the movable spring piece so that the bottom of the laminated part is in line-surface contact with the side of the movable spring piece facing away from the movable contact point.

6. The normally open snap-on electromagnetic relay according to claim 2, 3 or 5, characterized in that: The positioning piece is L-shaped with a bending portion, and the bending line of the bending portion is arranged along the length direction of the movable spring piece; the vertical side of the L-shape of the positioning piece is inserted into the coil frame, and the horizontal side of the L-shape of the positioning piece is adapted to be above the upper flange of the coil frame; the horizontal side of the L-shape of the positioning piece includes the blocking portion and the connecting section between the blocking portion and the bending portion; a first notch is also provided between the portion of the blocking portion with the protrusion and the bending portion.

7. The normally open clap-type electromagnetic relay according to claim 6, characterized in that: In the first notch, a second notch is further provided at the junction of the connecting section and the shifting portion.

8. The normally open clap-type electromagnetic relay according to claim 6, characterized in that: In the bending portion of the positioning piece, a cut mark is provided on the outer side of the bending portion, and a convex rib is formed on the inner side of the bending portion.

9. The normally open clap-type electromagnetic relay according to claim 6, characterized in that: A convex burl is provided on an L-shaped vertical side of the positioning piece for interference fit with the slot of the coil frame. The upper section of the convex burl is in a straight surface shape, and the lower section of the convex burl is in an inclined surface shape.

10. The normally open clap-type electromagnetic relay according to claim 1, characterized in that: The movable spring is bent into an L-shape by a bending portion, a vertical side of the L-shape of the movable spring is fixed to the yoke of the relay, and a horizontal side of the L-shape of the movable spring includes a portion of the movable spring to which the armature is fixed downward and a portion of the movable spring to which the movable contact is fixed downward, and the portion of the movable spring to which the armature is fixed downward and the portion of the movable spring to which the movable contact is fixed downward are connected by a downward first bend and an upward second bend.

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