CN216213166U - Normally open type clapper type electromagnetic relay - Google Patents

Abstract

The utility model discloses a normally open type clapper type electromagnetic relay, which comprises a coil rack, an iron core, a movable spring armature component, a normally open static spring and a positioning sheet, wherein the coil rack is provided with a coil hole; the normally open static reed and the positioning piece are respectively inserted in the coil frame, and the gear part of the positioning piece and the part of the normally open static reed, which is fixed with the static contact, are matched on the coil frame in a way of up-down clearance; the part of the movable spring, on which the movable contact is fixed downwards, extends to the clearance fit position between the normally open static spring and the positioning piece along the length direction of the movable spring; the position of the positioning piece is provided with a convex part which protrudes towards the direction of the movable spring piece at the position corresponding to the movable contact, and the convex part is arranged along the width direction of the movable spring piece, so that the position of the positioning piece is in line-surface contact with the surface of the movable spring piece, which is back to the movable contact. The utility model leads the positioning sheet and the movable spring sheet to be in line-surface contact, thereby improving the contact stability between the movable spring sheet and the positioning sheet and ensuring the consistency of the contact clearance.

Description

Normally open type clapper type electromagnetic relay

Technical Field

The utility model relates to the technical field of relays, in particular to a normally-open clapper type electromagnetic relay.

Background

A relay is an electronic control device having a control system (also called an input loop) and a controlled system (also called an output loop), which is commonly used in automatic control circuits, and which is actually an "automatic switch" that uses a small current to control a large current. Therefore, the circuit plays the roles of automatic regulation, safety protection, circuit conversion and the like. The axial line of the core hole of the coil rack is vertically arranged, the pole surface of the iron core is arranged at the upper end of the coil rack, the armature in the armature part of the movable spring is matched above the pole surface of the iron core, the movable spring is usually bent into an L shape, one L-shaped side of the movable spring is fixed with the armature, a movable contact is arranged at the position close to the tail end of one L-shaped side of the movable spring, the other L-shaped side of the movable spring is fixed with the yoke, when the coil is electrified, the armature moves towards the pole surface of the iron core and drives the movable contact of the movable spring to move until the normally open stationary contact at the position corresponding to the movable contact is contacted with the normally open stationary contact to realize the overtravel, because the armature part of the movable spring is slapped towards the coil rack, the normally open stationary spring is usually arranged in the extending part of the upper flange of the coil rack towards the side edge, and the normally open type slapping electromagnetic relay, because of lacking the restriction of the static spring of the normal close to the movable spring, need set up the spacer usually, is used for solving the uncontrollable problem of contact clearance, action voltage, the spacer is also installed on the extension of the upper flange of the bobbin usually, and be in the top of the static contact of the normal open, the movable contact spring corresponding to the movable contact position then is in between static contact and spacer of the normal open, when the coil is not electrified, the movable contact spring of this part leans on to the spacer. In the normally open clapper type electromagnetic relay in the prior art, the movable spring plate is in surface-to-surface contact with the positioning plate, and the contact position of the movable spring plate and the positioning plate is not well controlled; and because the movable spring has certain inclination relative to the horizontal plane after being disconnected, the contact positions of the movable spring and the positioning sheet are different, and the contact gaps of the movable contact and the fixed contact are also different, so that the consistency of the contact gaps is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a normally-open clapper type electromagnetic relay, which enables a positioning sheet and a movable spring sheet to be in line-to-surface contact through structural improvement, so that the contact stability between the movable spring sheet and the positioning sheet can be improved, and the consistency of contact gaps can be ensured.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a normally open clapper type electromagnetic relay comprises a coil rack, an iron core, a movable spring armature component, a normally open static spring and a positioning sheet; the iron core is matched in the iron core hole of the coil frame, the axis of the iron core hole is vertically arranged, and the pole surface of the iron core is arranged at the upper end of the coil frame; the normally open static spring and the positioning piece are respectively inserted in the coil rack, and the gear part of the positioning piece and the part of the normally open static spring fixed with the static contact are matched on the upper flange of the coil rack in a vertically clearance manner; the part of the movable spring, which is fixed with the armature downwards, in the movable spring armature component is matched above the pole surface of the iron core, and the part of the movable spring, which is fixed with the movable contact downwards, extends to a clearance fit position between the normally-open static spring and the positioning piece from the part fixed with the armature along the length direction of the movable spring; the position of the position blocking part of the positioning piece corresponding to the movable contact is provided with a protruding part protruding towards the direction of the movable spring, and the protruding part is arranged along the width direction of the movable spring, so that the position blocking part of the positioning piece is in line-surface contact with one surface of the movable spring, which is back to the movable contact.

The contact position of the line and the surface of the positioning sheet when the gear part of the positioning sheet is contacted with the surface of the movable spring sheet back to the movable contact is close to or opposite to the middle position of the movable contact.

The convex part of the positioning sheet is formed by striking or bending the gear part of the positioning sheet into a V-shaped downward convex shape in section, and the line of the bottom end of the V shape is arranged along the width direction of the movable spring sheet, so that the bottom end of the V-shaped downward convex shape of the positioning sheet is in line-to-surface contact with one surface of the movable spring sheet, which is back to the movable contact.

The convex part of the positioning sheet is formed by striking or bending two positions in the gear part of the positioning sheet into a shape with a double-V-shaped downward convex section, the bottom end lines of the two V-shaped downward convex sections are arranged along the width direction of the movable spring piece, and in the two V-shaped downward convex sections, the bottom end of the V-shaped downward convex section close to the outer side end is lower than the bottom end of the V-shaped downward convex section close to the inner side end, so that the bottom ends of the two V-shaped downward convex sections of the positioning sheet and one surface of the movable spring piece, which is back to the movable contact, are in line contact with the surface twice.

In the downward convex shape of the V shape, the bottom of the downward convex shape of the V shape is in a circular arc shape.

The protruding part of the positioning sheet is formed by downwards and inwards bending the tail end of the blocking part of the positioning sheet into a laminated shape, and the bending line of the laminated is arranged along the width direction of the movable spring plate, so that the bottom of the bending part of the laminated is in line-to-surface contact with one surface of the movable spring plate, which is back to the movable contact.

The positioning sheet is in an L shape with a bending part, and the bending line of the bending part is arranged along the length direction of the movable spring leaf; the L-shaped vertical side of the positioning plate is inserted on the coil rack, and the L-shaped horizontal side of the positioning plate is matched above the upper flange of the coil rack; the L-shaped horizontal side of the positioning piece comprises the gear part and a connecting section from the gear part to the bending part; a first notch is further formed between the part, provided with the protruding portion, of the gear portion and the bent portion.

In the first notch, a second notch is further arranged at the joint of the connecting section and the gear part.

In the bending part of the positioning sheet, one side of the outer side of the bending part is provided with a cutting mark, and one side of the inner side of the bending part forms a convex rib.

A convex bract used for being in interference fit with the slot of the coil rack is arranged on one vertical side of the L shape of the positioning piece, the upper section of the convex bract is in a straight surface shape, and the lower section of the convex bract is in an inclined surface shape.

The movable spring is bent into an L-shaped shape through a bending part, the vertical side of the L-shaped shape of the movable spring is fixed with a yoke of the relay, the horizontal side of the L-shaped shape of the movable spring comprises a part of the movable spring, which is fixed with an armature downwards, and a part of the movable spring, which is fixed with a movable contact downwards, and the part of the movable spring, which is fixed with the armature downwards, is connected with the part of the movable spring, which is fixed with the movable contact downwards, through a first downward bending and a second upward bending.

Compared with the prior art, the utility model has the beneficial effects that:

1. the utility model adopts the structure that the position of the positioning piece corresponding to the movable contact is provided with a convex part which protrudes towards the direction of the movable spring, and the convex part is arranged along the width direction of the movable spring. The structure of the utility model ensures that the positioning sheet and the movable spring sheet are in line-to-surface contact, thereby improving the contact stability between the movable spring sheet and the positioning sheet and ensuring the consistency of the contact clearance.

2. The utility model adopts the structure that the contact position of the line and the surface of the positioning sheet when the gear part of the positioning sheet is contacted with the surface of the movable spring sheet back to the movable contact is close to or opposite to the middle position of the movable contact. According to the structure, the contact position of the gear part of the positioning sheet and the surface of the movable spring, which is back to the movable contact, is designed to be close to or opposite to the middle position of the movable contact, so that the problems that the air gap between the armature and the iron core is enlarged and the suction counter force is unmatched are solved, and meanwhile, the effect of stably controlling the contact gap can be realized.

3. In the V-shaped downward convex shape of the positioning sheet, the bottom of the V-shaped downward convex shape is in a circular arc shape. The structure of the utility model can ensure that the movable spring contact with a certain slope at any time by utilizing the arc shape of the convex part of the positioning sheet.

4. According to the utility model, a first notch is further arranged between the part, provided with the protruding part, of the gear part and the bent part, and a second notch is further arranged at the joint of the connecting section and the gear part in the first notch. The structure of the utility model enables the convex part with the V-shaped cross section and the downward convex shape to be formed by beating or bending the gear part of the positioning sheet.

5. In the utility model, the cutting marks are arranged on one surface of the outer side of the bent part in the bent part of the positioning sheet, and the convex ribs are formed on one surface of the inner side of the bent part. According to the structure, the convex ribs are formed on the cut marks of the bending parts, so that the stability of the size after bending can be improved, and the positioning pieces are not easy to generate plastic deformation when being impacted by repeated release of the movable spring, so that the stability of the contact gap and the stroke of the relay, namely the stability of the action voltage, is ensured.

The utility model is further explained in detail with the accompanying drawings and the embodiments; however, a normally open type clapper type electromagnetic relay of the present invention is not limited to the embodiment.

Drawings

FIG. 1 is an exploded perspective view of a first embodiment of the present invention;

FIG. 2 is a schematic view of the spacer of the first embodiment of the present invention;

FIG. 3 is a schematic perspective view of a positioning plate according to a first embodiment of the present invention;

FIG. 4 is a front view of a spacer according to a first embodiment of the present invention;

FIG. 5 is an enlarged schematic view of section A of FIG. 4;

FIG. 6 is a top view of a spacer according to a first embodiment of the present invention;

FIG. 7 is a side view of a splines according to a first embodiment of the utility model;

FIG. 8 is an enlarged schematic view of section B of FIG. 7;

FIG. 9 is a first schematic view of a first embodiment of the present invention, illustrating a first structure for adjusting a contact gap by using a spacer;

FIG. 10 is an enlarged schematic view of section C of FIG. 9;

FIG. 11 is a second schematic view of a first embodiment of the present invention, showing a contact gap adjusted by a spacer;

FIG. 12 is an enlarged schematic view of section D of FIG. 11;

FIG. 13 is a side view of a splines according to a second embodiment of the utility model;

FIG. 14 is an enlarged schematic view of section E of FIG. 13;

FIG. 15 is a structural sectional view of a second embodiment of the present invention;

FIG. 16 is an enlarged schematic view of section F of FIG. 15;

FIG. 17 is a side view of a spacer according to a third embodiment of the present invention;

FIG. 18 is an enlarged schematic view of section G of FIG. 17;

fig. 19 is a structural sectional view of a third embodiment of the present invention.

Detailed Description

Example one

Referring to fig. 1 to 12, a normally open clapper type electromagnetic relay according to the present invention includes a housing 10, a coil bobbin 1, an iron core 2, a movable spring and armature member 3, a normally open static spring 4, and a positioning plate 5; the iron core 2 is matched in the iron core hole 11 of the coil frame 1, the axis of the iron core hole 11 is vertically arranged, and the pole face 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 upper and lower directions in the technical features are defined only to indicate the relative positional relationship between the components or the structures in the components, for example, when the core hole of the bobbin 1 is vertically arranged, the pole face of the core 2 is located at the upper end of the bobbin, and when the core hole of the bobbin is horizontally arranged, the pole face of the core 2 is located at the left or right end of the bobbin 1. Normally open static reed 4 and positioning piece 5 are respectively inserted into coil frame 1, and make the gear part 51 of positioning piece 5 and the part 42 of normally open static reed 4 fixed with static contact 41 fit on the upper surface of upper flange 12 of coil frame 1 with up-down clearance; the part 311 of the movable spring 31 of the movable spring armature component 3, which is fixed with the armature 32 downwards, is matched above the pole surface 21 of the iron core 2, and the part 312 of the movable spring 31, which is fixed with the movable contact 33 downwards, extends from the part 311 of the movable spring 31, which is fixed with the armature 32, to the clearance fit position between the normally-open fixed spring 4 and the positioning piece 5 along the length direction of the movable spring 31; the position-shift portion 51 of the positioning plate 5 is provided with a protrusion 6 protruding toward the movable spring 31 at a position corresponding to the movable contact, and the protrusion 6 is provided along the width direction of the movable spring 31 so that the position-shift portion 51 of the positioning plate 5 is in line-to-plane contact with the surface of the movable spring 31 facing away from the movable contact 33.

In this embodiment, the contact position between the line and the surface of the positioning piece 5 when the shift portion 51 contacts with the surface of the movable spring 31 facing away from the movable contact is close to or opposite to the middle position of the movable contact 33.

In this embodiment, the protruding portion 6 of the positioning plate 5 is formed by striking or bending the shift portion 51 of the positioning plate 5 into a V-shaped downward protruding shape 61 with a cross section, and a bottom line of the V-shape is arranged along the width direction of the movable spring piece 31, so that the bottom end of the V-shaped downward protruding shape 61 of the positioning plate 6 is in line-to-plane contact with a surface of the movable spring piece 31 facing away from the movable contact.

In this embodiment, in the V-shaped downward-projecting shape 61, the bottom of the V-shaped downward-projecting shape 61 is a circular arc shape 611.

In this embodiment, the positioning piece 5 has an L-shape having a bent portion 52, and a bending line of the bent portion 52 is provided along the longitudinal direction of the movable spring 31; the L-shaped vertical side 53 of the positioning plate 5 is inserted on the coil rack 1, and the L-shaped horizontal side 54 of the positioning plate 5 is adapted above the upper flange 12 of the coil rack 1; the L-shaped horizontal side 54 of the positioning plate 5 comprises the gear portion 51 and a connecting section 55 from the gear portion to the bent portion; a first notch 56 is further provided between the portion 511 of the gear portion 51 having the protruding portion 6 and the bent portion 52.

In this embodiment, a second notch 57 is further provided in the first notch 56 at the junction of the connecting segment 55 and the gear portion 51. The first notch 56 is provided to form the shift portion 51 of the positioning plate 5 and to facilitate the provision of the protrusion 6 having a V-shaped downwardly protruding shape 61 on the shift portion 51, and the second notch 57 is provided to prevent the tearing at the joint of the protrusion and the cantilever, which may result in the generation of metal chips, when the protrusion is bent.

In the present embodiment, in the folded portion 52 of the positioning piece 5, a cut mark 521 is provided on the outer side of the folded portion 52, and a rib 522 is formed on the inner side of the folded portion 52.

In this embodiment, the L-shaped vertical side 53 of the positioning sheet 5 is provided with a protruding bud 531 for interference fit with the slot 13 of the coil rack 1, an upper section 532 of the protruding bud 531 is in a straight surface shape, and a lower section 533 of the protruding bud 531 is in an inclined surface shape. The slots 13 of the coil former 1 are provided in both the upper flange 12 and the lower flange 14 of the coil former 1. As shown in fig. 5, the lower segment 533 of the protrusions 531 is formed with an inclination angle α that allows the pins of the spacers 5 to be more easily inserted into the bobbin 1; the upper section 532 is square with straight surface, which can solve the problem of spring back after the pin is inserted into the coil frame 1.

In this embodiment, the movable spring 31 is bent into an L-shape by a bent portion 313, the L-shaped vertical side 314 of the movable spring is fixed to the yoke 71 of the relay, the L-shaped horizontal side 315 of the movable spring 31 includes a portion 311 of the movable spring to which the armature is fixed downward and a portion 312 of the movable spring to which the movable contact is fixed downward, and the portion 311 of the movable spring 31 to which the armature is fixed downward and the portion 312 of the movable spring to which the movable contact is fixed downward are connected by a downward first bend 316 and an upward second bend 317.

Referring to fig. 8 to 12, in the present invention, the positioning plate 5 is provided with the protrusion 6 having the V-shaped downward protrusion 61, the bottom of the V-shaped downward protrusion 61 of the protrusion 6 is in the shape of an arc 611, and the movable spring 31 having a certain inclination angle β constantly ensures the contact manner between the line and the surface, thereby ensuring the contact stability. By controlling the a size of the positioning plate 5, the bottom end position of the V-shaped downward convex shape 61 can be ensured to be positioned above the movable contact 33. During the pressing down of the positioning plate 5, the movable spring 31 will initially contact the bottom of the V-shaped downward convex shape 61 in the shape of the arc 611 (see the contact position in fig. 10), and during the further pressing down of the positioning plate 5, the contact position will slide, and the contact gap (b size) will shrink at the same time, until the contact gap is required and then stop pressing down (fig. 12 shows that the contact gap is pressed down to the designated position). The design of the bottom of the V-shaped downward convex shape 61 as a circular arc shape 611 has the following advantages: the positioning piece can be stably contacted with a movable spring with a certain inclination angle beta, and the movable spring can be stably contacted even if the angle beta changes in the pressing process of the positioning piece; secondly, in the process of pressing down the positioning sheet, the positioning sheet 5 and the movable spring leaf 31 slide relatively, and the design of the arc-shaped bottom can avoid the risk of metal chips caused by scratching the movable spring leaf in the sliding process; and thirdly, in the process that the bottom of the arc slides relative to the movable spring piece 31, the friction force is small, the resistance in the pressing process is reduced, and the control of the size of the contact gap is facilitated.

A normally open clapper type electromagnetic relay of the present invention adopts a structure in which a protrusion 6 protruding toward a movable contact piece 31 is provided at a position corresponding to a movable contact 33 in a latch portion 51 of a positioning plate 5, and the protrusion 6 is provided along the width direction of the movable contact piece 31. The structure of the utility model enables the positioning sheet 5 and the movable spring sheet 31 to be in line-to-surface contact, thereby improving the contact stability between the movable spring sheet 31 and the positioning sheet 5 and ensuring the consistency of contact gaps.

The utility model is provided with a positioning sheet 5 at the normally closed end, and the function of the positioning sheet 5 is as follows: firstly, the contact clearance and the stroke value can be effectively controlled by pressing down the normally closed end positioning sheet 5; when the contact gap and the stroke are ensured to be within a controllable range, the action voltage of the product has good consistency; and secondly, the problem that the movable spring is greatly upwarped due to the counter force of the bent part when the relay is released can be limited, the motion range of the movable spring can be effectively controlled, and the situation that the movable spring directly impacts the shell due to rebounding when the movable spring is released is prevented.

The normally open clapper type electromagnetic relay adopts the middle position that the contact part of the line and the surface is close to or opposite to the movable contact 33 when the gear part 51 of the positioning plate 5 is contacted with the surface of the movable spring 31 back to the movable contact. According to the structure of the utility model, the contact position of the gear part 51 of the positioning sheet 5 and the surface of the movable spring leaf 31, which is back to the movable contact, is designed to be close to or opposite to the middle position of the movable contact 33, so that the problems that the air gap between the armature and the iron core is enlarged and the suction counterforce is unmatched are solved, and meanwhile, the effect of stably controlling the contact gap can be realized.

The utility model relates to a normally open clapper type electromagnetic relay, which adopts a V-shaped downward convex shape 61 of a positioning sheet 5, wherein the bottom of the V-shaped downward convex shape 61 is in a circular arc shape 611. The configuration of the present invention ensures that the movable spring 31 having a constant slope is constantly in contact with the convex portion 6 of the positioning piece 5 due to the arc shape 61.

In the normally open type clapper type electromagnetic relay, a first notch 56 is further arranged between a part 511 of the gear part 5, which is provided with the convex part 6, and the bent part 52, and a second notch 57 is further arranged at the joint of the connecting section 55 and the gear part 51 in the first notch 56. The structure of the present invention is such that the protrusion 6 having a V-shaped downwardly protruding cross-section can be formed by hitting or bending the stopper portion 51 of the positioning piece 5.

In the normally open clapper type electromagnetic relay, in the bent part 52 of the positioning sheet 5, a cut-off mark 521 is arranged on one surface of the outer side of the bent part 52, and a convex rib 522 is formed on one surface of the inner side of the bent part 51, namely, a convex rib with a triangle-like appearance perpendicular to a bent line is formed on the back surface of the cut-off mark. According to the structure, the convex rib 522 is formed on the cutting mark 521 of the bending part 52, so that the positioning sheet 5 after being bent can be effectively prevented from being twisted along the bending line, the strength of the bending part 51 can be enhanced, and the dimensional stability after being bent can be improved; the torsional deformation caused by the impact of the movable spring on the positioning sheet 5 during release is slowed down, and the bending angle after multiple actions and release is ensured, so that the stability of the contact clearance and the stroke of the relay, namely the stability of the action voltage is ensured.

Example two

Referring to fig. 13 to 16, a normally open clapper type electromagnetic relay according to the present invention is different from the first embodiment in that the protruding portion 6 of the positioning piece 5 is disposed in a different manner. In this embodiment, the protruding portion 6 of the positioning plate 5 is formed by bending the end of the shift portion 51 of the positioning plate 5 downward and inward into a lamination shape, and the bending line of the lamination 62 is arranged along the width direction of the movable spring, so that the bottom of the bending portion of the lamination 62 is in line-to-plane contact with the surface of the movable spring 31 facing away from the movable contact.

In the present embodiment, the protruding portion 6 of the positioning plate 5 is changed to the structure of the lamination 62, and the bent portion is arc-shaped, which also has the same effect as the embodiment. The included angle gamma between the movable spring plate 31 and the lower surface of the lamination 62 is more than 0 degrees, and the circular arc part of the lamination 62 can always realize the line-to-surface contact mode with the movable spring plate 31.

EXAMPLE III

Referring to fig. 17 to 19, a normally open type clapper type electromagnetic relay according to the present invention is different from the first embodiment in that the protrusion 6 of the positioning plate 5 is formed by striking or bending two positions of the shift portion 51 of the positioning plate 5 into a downward protruding shape 61 with a double V-shape in cross section, which is equivalent to form a "W" shape 63, and the bottom ends of the two V-shapes are both arranged along the width direction of the movable spring piece 31, and the bottom end of the downward protruding shape of the V-shape close to the outer end of the two V-shapes 61 is lower than the bottom end of the downward protruding shape of the V-shape close to the inner end, so that the bottom ends of the two V-shapes of the positioning plate and the surface of the movable spring piece facing away from the movable contact are in line contact twice.

The bulge 6 of the positioning sheet of the embodiment is of a W-like structure, and a height difference c > 0 exists between two tip arc bottom surfaces of the structure. The movable spring 31 is initially contacted with the tip arc close to the outer side, when the relay releases and the movable spring impacts the positioning piece, the bending part of the movable spring deforms, and the tip arc close to the inner side of the positioning piece is contacted with the deformed movable spring, so that the function of limiting the further expansion of the bending angle of the movable spring is achieved. The structure can control the change range of the bending angle of the movable reed, thereby slowing down the irreversible plastic deformation of the bending part.

When the movable spring plate 31 collides with the positioning plate 5, the movable spring plate 31 is deformed to a certain extent under the action of inertia, and at the moment, the movable spring plate 31 is in arc contact with the tip end of the positioning plate 5 close to the inner side, so that the length of the rotating shaft is reduced, the reduction of the length of the rotating shaft can reduce the torque acting on the movable spring, and further the contact clearance change caused by plastic deformation due to further deformation of the movable spring is avoided.

The foregoing is considered as illustrative of the preferred embodiments of the utility model and is not to be construed as limiting the utility model in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the scope of the disclosed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (11)

1. A normally open clapper type electromagnetic relay comprises a coil rack, an iron core, a movable spring armature component, a normally open static spring and a positioning sheet; the iron core is matched in the iron core hole of the coil frame, the axis of the iron core hole is vertically arranged, and the pole surface of the iron core is arranged at the upper end of the coil frame; the normally open static spring and the positioning piece are respectively inserted in the coil rack, and the gear part of the positioning piece and the part of the normally open static spring fixed with the static contact are matched on the upper flange of the coil rack in a vertically clearance manner; the part of the movable spring, which is fixed with the armature downwards, in the movable spring armature component is matched above the pole surface of the iron core, and the part of the movable spring, which is fixed with the movable contact downwards, extends to a clearance fit position between the normally-open static spring and the positioning piece from the part fixed with the armature along the length direction of the movable spring; the method is characterized in that: the position of the position blocking part of the positioning piece corresponding to the movable contact is provided with a protruding part protruding towards the direction of the movable spring, and the protruding part is arranged along the width direction of the movable spring, so that the position blocking part of the positioning piece is in line-surface contact with one surface of the movable spring, which is back to the movable contact.

2. The normally open clapper electromagnetic relay of claim 1, wherein: the contact position of the line and the surface of the positioning sheet when the gear part of the positioning sheet is contacted with the surface of the movable spring sheet back to the movable contact is close to or opposite to the middle position of the movable contact.

3. The normally open clapper electromagnetic relay of claim 2, wherein: the convex part of the positioning sheet is formed by striking or bending the gear part of the positioning sheet into a V-shaped downward convex shape in section, and the line of the bottom end of the V shape is arranged along the width direction of the movable spring sheet, so that the bottom end of the V-shaped downward convex shape of the positioning sheet is in line-to-surface contact with one surface of the movable spring sheet, which is back to the movable contact.

4. The normally open clapper electromagnetic relay of claim 3, wherein: the convex part of the positioning sheet is formed by striking or bending two positions in the gear part of the positioning sheet into a shape with a double-V-shaped downward convex section, the bottom end lines of the two V-shaped downward convex sections are arranged along the width direction of the movable spring piece, and in the two V-shaped downward convex sections, the bottom end of the V-shaped downward convex section close to the outer side end is lower than the bottom end of the V-shaped downward convex section close to the inner side end, so that the bottom ends of the two V-shaped downward convex sections of the positioning sheet and one surface of the movable spring piece, which is back to the movable contact, are in line contact with the surface twice.

5. The normally open clapper electromagnetic relay according to claim 3 or 4, wherein: in the downward convex shape of the V shape, the bottom of the downward convex shape of the V shape is in a circular arc shape.

6. The normally open clapper electromagnetic relay of claim 2, wherein: the protruding part of the positioning sheet is formed by downwards and inwards bending the tail end of the blocking part of the positioning sheet into a laminated shape, and the bending line of the laminated is arranged along the width direction of the movable spring plate, so that the bottom of the bending part of the laminated is in line-to-surface contact with one surface of the movable spring plate, which is back to the movable contact.

7. The normally open clapper electromagnetic relay of claim 3 or 4 or 6, wherein: the positioning sheet is in an L shape with a bending part, and the bending line of the bending part is arranged along the length direction of the movable spring leaf; the L-shaped vertical side of the positioning plate is inserted on the coil rack, and the L-shaped horizontal side of the positioning plate is matched above the upper flange of the coil rack; the L-shaped horizontal side of the positioning piece comprises the gear part and a connecting section from the gear part to the bending part; a first notch is further formed between the part, provided with the protruding portion, of the gear portion and the bent portion.

8. The normally open clapper electromagnetic relay of claim 7, wherein: in the first notch, a second notch is further arranged at the joint of the connecting section and the gear part.

9. The normally open clapper electromagnetic relay of claim 7, wherein: in the bending part of the positioning sheet, one side of the outer side of the bending part is provided with a cutting mark, and one side of the inner side of the bending part forms a convex rib.

10. The normally open clapper electromagnetic relay of claim 7, wherein: a convex bract used for being in interference fit with the slot of the coil rack is arranged on one vertical side of the L shape of the positioning piece, the upper section of the convex bract is in a straight surface shape, and the lower section of the convex bract is in an inclined surface shape.

11. The normally open clapper electromagnetic relay of claim 1, wherein: the movable spring is bent into an L-shaped shape through a bending part, the vertical side of the L-shaped shape of the movable spring is fixed with a yoke of the relay, the horizontal side of the L-shaped shape of the movable spring comprises a part of the movable spring, which is fixed with an armature downwards, and a part of the movable spring, which is fixed with a movable contact downwards, and the part of the movable spring, which is fixed with the armature downwards, is connected with the part of the movable spring, which is fixed with the movable contact downwards, through a first downward bending and a second upward bending.

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