A high-insulation small snap-on electromagnetic relay

Abstract

The invention discloses a high-insulation small-sized snap-on electromagnetic relay, comprising a coil frame, a coil lead pin, an iron core and a static spring part; the coil frame has a winding shaft for winding enameled wire, and the iron core comprises a core shaft and a pole surface arranged at the upper end of the core shaft; the core shaft of the iron core fits in the central hole of the winding shaft of the coil frame, the coil lead pin is installed on one side of the lower flange of the coil frame corresponding to the width of the coil frame, and the static spring part is inserted on the other side of the upper and lower flanges of the coil frame corresponding to the width of the coil frame; the winding shaft is offset. After adopting this structure, the spacing between the coil and the static spring can be increased without increasing the volume of the product, so as to increase the creepage distance between the coil and the static spring, effectively improve the pressure resistance of the product, and have the characteristics of reducing the difficulty of production, reducing the process, reducing the production cost, and facilitating the realization of assembly automation and product miniaturization.

Description

Technical Field

[0001] The invention relates to the technical field of relays, and in particular to a high-insulation small-sized snap-on electromagnetic relay. Background Art

[0002] The snap-on magnetic circuit structure is a classic structure widely used in the relay industry. This structure is relatively simple and has relatively low manufacturing difficulty, so it is suitable for relays of different sizes and loads. However, due to structural limitations, this relay also has the disadvantage of poor insulation performance, especially in small products, which is more obvious due to size and space limitations.

[0003] A small snap-on electromagnetic relay in the prior art, such as Figures 1 to 4 As shown, the relay comprises a coil frame 101, a yoke 102, an iron core 103, a movable spring armature part 104, a normally open static spring 105, a normally closed static spring 106 and a housing 107. The coil frame 101, as the main part of the relay, has a winding shaft 108 symmetrically arranged along the width direction of the coil frame 101, and two lead pins 109 of the coil are arranged at the bottom position of the same side in the width direction of the coil frame 101. The two lead pins 109 are basically arranged in the same plane, one on the left and one on the right, in the length direction of the coil frame 101; the overall symmetrical round rod iron core 103 is assembled into the hole of the winding shaft 108 of the coil frame (that is, the iron core hole of the coil frame 101), and the L-shaped yoke 102 symmetrical along the width direction of the coil frame 101 is assembled into the coil frame 101 and riveted with the iron core 103 to form a whole. The normally open static spring 105 and the normally closed static spring 106, which are L-shaped as a whole, are respectively installed in the coil frame 101 from the other side of the coil frame 101 opposite to the coil lead pin 109 and in the lateral direction along the width direction, and are clamped and matched with the coil frame 101 through the extended end of the contact surface. After being installed and positioned, the normally open static spring 105 and the normally closed static spring 106 extend out of the lead pin part of the lower part of the winding window of the coil frame 101, and are basically arranged in the same plane on the left and right in the length direction; inside the winding window of the coil frame 101, in the width direction, the normally open static spring 105 and the normally closed static spring 106 are placed in a front-to-back overlapping manner; above the winding window of the coil frame 101, the coil frame 101 is provided with a protruding mechanism 110 to limit the normally open static spring 105 and the normally closed static spring 106, and the highest point of the protruding mechanism 110 used for positioning is higher than the contact extension surface of the static spring. After the movable spring armature part 104 and the outer side of the yoke 102 are clamped and limited, the integral relay part is formed. After the relay part is covered with the housing 107, the relay product is formed.

[0004] The above-mentioned small snap-on electromagnetic relay has the following disadvantages: (1) The insulation distance between the input end (coil) and the output end (static spring, yoke iron) is insufficient, which restricts the insulation parameters of the product; (2) The static spring is inserted from the side of the coil frame and is clamped and positioned with the coil frame through the contact extension surface. In this assembly method, since the mechanical parameters of the relay, such as contact gap and contact overtravel, are completely dependent on the processing accuracy of the coil frame, it is difficult to ensure and adjust the qualified rate of the mechanical parameters; (3) Since a relatively high plastic protrusion block needs to be set above the winding window of the coil frame, when the height of the relay is limited, it will occupy the height space of the winding window of the coil frame, affecting the winding space. (4) As the static spring and the plastic are clamped around the contact, there is a risk that plastic chips will easily fall to the contact position, causing a non-conduction fault, and as the contact splashes will accumulate on the surrounding plastic used for positioning, there is a risk of reduced insulation performance between disconnected contacts; (5) As the normally open static spring and the normally closed static spring overlap front and back in the width direction of the winding window inside the coil frame, the static spring on the inner side is closer to the enameled wire, reducing the insulation distance between the coil and the two static springs. In addition, the structure of the two static springs inside the winding window requires bending in the length direction of the coil frame, which increases the difficulty and complexity of parts processing.

[0005] In order to solve the above problems, there are two main methods used in the prior art. One is to wrap a whole circle of tape on the coil and the coil lead-out terminal to increase the insulation between the coil (i.e., enameled wire) and the yoke and reed; however, this method of wrapping the surface of the coil enameled wire with tape, on the one hand, has the risk of causing the enameled wire to break, and on the other hand, the cost will increase due to the increase in materials and manufacturing processes; the other is to install an insulating sheet between the coil and the yoke to improve the insulation between the coil and the yoke; however, this method of installing an insulating sheet between the coil and the yoke, first, is difficult to assemble and it is difficult to ensure the consistency of the insulation effect; second, it is necessary to reserve space for assembling the insulating sheet, which will affect the winding space of the enameled wire and is not conducive to improving the performance of the product; third, it is difficult to solve the problem of insufficient insulation distance between the coil lead-out terminal and the reed; fourth, the increase in materials and manufacturing processes will lead to increased costs. Moreover, both solutions fail to solve the problem of foreign matter at the contact position and the decrease in insulation during use. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a high-insulation small-sized snap-on electromagnetic relay. Through structural improvement, the distance between the coil and the static spring can be increased without increasing the volume of the product, so as to increase the creepage distance between the coil and the static spring, effectively improve the pressure resistance of the product, and have the characteristics of reducing the difficulty of production, reducing the number of processes, reducing the production cost, and facilitating the realization of assembly automation and product miniaturization.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a high-insulation small-sized snap-on electromagnetic relay, comprising a coil frame, a coil lead pin, an iron core and a static spring part; the coil frame has an upper flange and a lower flange and a winding shaft connected between the upper flange and the lower flange and used to wind the enameled wire, and the axis of the winding shaft is arranged vertically; the iron core comprises a core shaft and a pole surface arranged at the upper end of the core shaft; the core shaft of the iron core is fitted in the central hole of the winding shaft of the coil frame, and the pole surface of the iron core is located at the middle position of the upper flange of the coil frame corresponding to the width direction of the coil frame; the coil lead pin is provided in ... The foot is installed on one side of the lower flange of the coil frame corresponding to the width of the coil frame, and a part of the coil lead-out foot appears in the winding window of the coil frame; the static spring part is inserted into the other side of the upper and lower flanges of the coil frame corresponding to the width of the coil frame; the axis of the winding shaft deviates from the center line of the width of the coil frame by a preset distance in the direction away from the static spring part, so that the axial symmetry center of the core axis of the iron core is offset from the axial symmetry center of the pole surface of the iron core by the preset distance, so as to increase the spacing between the coil and the static spring, increase the creepage distance between the coil and the static spring, and improve the insulation capacity.

[0008] Furthermore, it also includes a movable spring armature part and a yoke, one side of the yoke is fixed to the bottom end of the core shaft, and the other side of the yoke corresponds to the winding window of the coil frame, one side of the movable spring armature part is fixed to the other side of the yoke, and the other side of the movable spring armature part corresponds to the top of the pole surface of the iron core at the upper flange of the coil frame; the center line of the other side of the movable spring armature part corresponding to the width direction of the coil frame is substantially collinear with the center line of the pole surface of the iron core corresponding to the width direction of the coil frame.

[0009] One side of the yoke is provided with a first through hole for positioning the bottom end of the core shaft for assembling the iron core, and there is a preset distance between the center line of one side of the yoke corresponding to the width direction of the coil frame and the center line of the first through hole on one side of the yoke corresponding to the width direction of the coil frame.

[0010] The pole surface of the iron core is circular, elliptical or rectangular.

[0011] The static spring part includes an upper static spring and a lower static spring, and the upper static spring and the lower static spring are L-shaped respectively; the vertical sheets of the upper static spring and the lower static spring are respectively inserted into the upper and lower flanges of the coil frame corresponding to the width of the coil frame on the other side relative to the coil lead-out pin; the parts of the vertical sheets of the upper static spring and the lower static spring that appear in the winding window of the coil frame are all vertical structures and are distributed in parallel along the length direction of the coil frame.

[0012] The thickness direction of the vertical sheets of the upper static spring and the lower static spring is consistent with the width direction of the coil frame; the parts of the vertical sheets of the upper static spring and the lower static spring that appear in the winding window of the coil frame are coplanarly distributed on the other side of the width of the coil frame.

[0013] The upper and lower flanges of the coil frame are respectively provided with annular closed second and third through holes for inserting the vertical sheets of the upper and lower static springs, so that the upper and lower static springs can only be inserted into the coil frame from the top downward.

[0014] The width of the second through hole is greater than that of the third through hole, and a surface in the thickness direction of the lower part of the vertical sheet of the upper static spring and the lower static spring is provided with a clamping bulge fixed to the corresponding third through hole, and the upper static spring and the lower static spring are fixed to the coil frame by cooperating with the clamping bulge at the lower part of the vertical sheet and the corresponding third through hole of the lower flange of the coil frame, and the horizontal sheets of the upper static spring and the lower static spring are completely exposed on the upper flange of the coil frame.

[0015] A surface in the thickness direction of the upper part of the vertical sheet of the upper static spring and the lower static spring is provided with a positioning convex bump that cooperates with the corresponding second through hole. The upper static spring and the lower static spring are adjusted in position on the coil frame by cooperating with the corresponding second through hole of the upper flange of the coil frame through the positioning convex bump on the upper part of the vertical sheet.

[0016] At the top end of the vertical sheet of the upper static spring and the lower static spring, a cut cross section of the static spring material is provided next to the position where it is integrally connected to the horizontal sheet, so as to provide a pressing position for the preset corresponding tooling, so as to press the upper static spring or the lower static spring into the coil frame, and the pressing position is roughly collinear with the clamping bulge of the vertical sheet in the height direction corresponding to the coil frame.

[0017] In the lower flange of the coil frame, a sink lower than the winding window is provided at the insertion position corresponding to the upper static spring and the lower static spring on one side corresponding to the winding window of the coil frame, so as to further increase the creepage distance between this position and the enameled wire; an oblique chamfer is provided between the sink and the winding window, and the chamfer edge is flush with the third through hole.

[0018] In the upper flange of the coil frame, between the horizontal sheet of the lower static spring and the vertical sheet of the upper static spring, a first groove is arranged near the vertical sheet of the upper static spring. The first groove is arranged along the length direction of the coil frame, and the length dimension of the first groove is greater than the width dimension of the vertical sheet of the upper static spring.

[0019] In the upper flange of the coil frame, a retaining wall is also provided between the two second through holes above the upper flange to increase the insulation distance between the upper static spring and the lower static spring.

[0020] In the lower flange of the coil frame, in a side corresponding to the winding window of the coil frame, a second groove is also provided between the coil lead pin and the insertion position of the upper static spring and the lower static spring.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The present invention adopts the method of arranging the pole face of the iron core at the middle position of the upper flange of the coil frame corresponding to the width direction of the coil frame; installing the coil lead pin on one side of the lower flange of the coil frame corresponding to the width of the coil frame, inserting the static spring part on the other side of the upper and lower flanges of the coil frame corresponding to the width of the coil frame; and designing the axis of the winding shaft to deviate from the center line of the width of the coil frame by a preset distance in the direction away from the static spring part, so that the axisymmetric center of the core shaft of the iron core is offset from the axisymmetric center of the pole face of the iron core by the preset distance. This structure of the present invention, by keeping the pole face of the iron core at the axisymmetric center of the product, eccentrically arranging the winding shaft of the coil frame and the core shaft of the iron core, makes the coil (i.e. after the winding shaft is wound with enameled wire) as a whole eccentric and deviates to the side away from the static spring part, and can increase the distance between the coil and the static spring without affecting the balance of the magnetic circuit, thereby increasing the creepage distance between the coil and the static spring and improving the insulation capacity.

[0023] 2. The present invention adopts an eccentric setting of the winding axis of the coil frame. Under the condition that the ampere-turns of the coil remain unchanged, the distance between the coil and the static spring can be increased, the creepage distance can be increased, and the voltage resistance performance can be improved; at the same time, the coil frame can also be offset in the direction away from the yoke in the length direction to further increase the insulation between the coil and the yoke. When the distance between the coil and the static spring is sufficient and does not need to be increased, the number of coil turns can be increased, the ampere-turns value can be increased, the contact suction force can be improved, and then the contact pressure can be increased, the rebound can be reduced, the contact stability can be ensured, the arc can be reduced, and the life and reliability of the contact can be improved.

[0024] 3. The present invention adopts an eccentric arrangement of the winding axis of the coil frame, and is biased to the side away from the static spring part, thereby making room for the static spring to be assembled on the coil frame; the present invention further adopts a vertical structure in which the parts of the vertical sheets of the upper static spring and the lower static spring that appear in the winding window of the coil frame are all vertical and are distributed in parallel along the length direction of the coil frame, and the parts of the vertical sheets of the upper static spring and the lower static spring that appear in the winding window of the coil frame are distributed in the same plane on the other side of the width of the coil frame. This structure of the present invention can reduce the difficulty of manufacturing the static spring while ensuring the insulation distance between the static spring and the coil; the parts of the upper static spring and the lower static spring that appear in the winding window of the coil frame are all vertical structures, avoiding the disadvantages caused by the bending process of the static spring in the prior art, reducing the manufacturing process, and at the same time, reducing the size of the relay to achieve miniaturization.

[0025] 4. The present invention adopts the second and third through holes in the upper and lower flanges of the coil frame, which are respectively provided with annular closed holes for inserting the vertical sheets of the upper static spring and the lower static spring, so that the upper static spring and the lower static spring can be inserted into the coil frame from the top of the coil frame downward. Since the static spring is pressed in from top to bottom, which is the direction that affects the contact gap and overtravel of the relay, the mechanical parameters of the relay can be adjusted in real time by automatically adjusting the position of the static spring when pressing in, which can effectively improve the qualified rate of the parameters and reduce the dependence on the accuracy of the coil frame parts; at the same time, this installation method from top to bottom is also convenient for automatic assembly.

[0026] 5. The present invention adopts a clamping convex bulge fixed to the corresponding third through hole on one surface of the lower part of the vertical sheet of the upper static spring and the lower static spring in the thickness direction, and the upper static spring and the lower static spring are fixed to the coil frame through the clamping bulge of the lower part of the vertical sheet and the corresponding third through hole of the lower flange of the coil frame. Since the clamping position of the static spring and the coil frame is at the bottom of the coil frame, facing away from the contact mechanism, and there is a large plastic surface in the middle for isolation, it is not easy for plastic foreign matter in the clamping position to be transferred to the contact position; in addition, since it is not necessary to position the position close to the contact surface by the static spring as in the prior art, the plastic of the coil frame at this position can be removed, so that there is no excess plastic around the contact, and the splash generated during the use of the contact can be distributed away from the contact, reducing the impact on the insulation between the disconnected contacts; after removing the plastic of the coil frame at this position, the design of the plastic height of this part can be reduced, and when the overall height of the relay remains unchanged, the saved space can be given to the winding space of the coil frame, and the coil can obtain more ampere-turns without affecting the insulation distance, which is conducive to improving the comprehensive performance of the relay.

[0027] 6. The present invention adopts a method of providing a cut cross section of static spring material beside the position where the vertical sheet of the upper static spring and the lower static spring are integrally connected with the horizontal sheet to provide a pressing position for the preset corresponding tooling, and the upper static spring and the lower static spring are pressed into the coil frame, and the pressing position and the clamping convex bulge of the vertical sheet are roughly collinear in the height direction corresponding to the coil frame. This structure of the present invention can prevent the static spring from generating deflection torque when it is pressed into the coil frame, so as to improve the accuracy of the pressing position.

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, the high-insulation small-sized snap-on electromagnetic relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the appearance of a snap-on electromagnetic relay in the prior art;

[0030] Figure 2It is a three-dimensional structural schematic diagram of a snap-on electromagnetic relay (without the housing) of the prior art;

[0031] Figure 3 It is a front view of a snap-on electromagnetic relay (without the housing) of the prior art;

[0032] Figure 4 It is a side view of a snap-on electromagnetic relay (without the housing) of the prior art;

[0033] Figure 5 It is a three-dimensional structural schematic diagram of an embodiment of the present invention (without the outer shell);

[0034] Figure 6 is a front view of an embodiment of the present invention (with the housing removed);

[0035] Figure 7 It is a three-dimensional structural schematic diagram of an embodiment of the present invention (without the housing) (rotated at an angle);

[0036] Figure 8 is a side view of an embodiment of the present invention (with the housing removed);

[0037] Fig. 9 is a bottom view of an embodiment of the present invention (with the housing removed);

[0038] Fig.10 It is a schematic diagram of a three-dimensional structure of a coil frame, an iron core and a yoke iron in cooperation with each other according to an embodiment of the present invention;

[0039] Fig.11 is a top view of the coil frame, the iron core and the yoke iron in the embodiment of the present invention;

[0040] Fig.12 is a schematic diagram of the three-dimensional structure of a coil frame according to an embodiment of the present invention;

[0041] Fig.13 is a side view of a coil former according to an embodiment of the present invention;

[0042] Fig.14 It is a schematic diagram of a three-dimensional structure of an iron core, an armature and a yoke in cooperation with each other according to an embodiment of the present invention;

[0043] Fig.15 is a side view of the iron core, the armature and the yoke in cooperation with each other according to an embodiment of the present invention;

[0044] Fig.16 is a schematic diagram of the three-dimensional structure of the upper static spring of an embodiment of the present invention;

[0045] Fig.17 is a front view of an upper static spring of an embodiment of the present invention;

[0046] Fig.18is a schematic diagram of the three-dimensional structure of the lower static spring of an embodiment of the present invention;

[0047] Fig.19 is a front view of a lower static spring of an embodiment of the present invention;

[0048] Fig. 20 Schematic diagram of the three-dimensional structure of the yoke of an embodiment of the present invention;

[0049] Fig.21 is a schematic diagram of the three-dimensional structure of the iron core of an embodiment of the present invention;

[0050] Fig. 22 It is a side view of the core according to the embodiment of the present invention. DETAILED DESCRIPTION

[0051] Example

[0052] See also Figures 5 to 22 As shown, a high-insulation small-sized snap-on electromagnetic relay of the present invention comprises a coil frame 2, a coil lead-out pin 1, an iron core 3 and a static spring portion; the coil frame 2 comprises an upper flange 21, a lower flange 22 and a winding shaft 23 connected between the upper and lower flanges and used to wind the enameled wire, and the axis of the winding shaft 23 is arranged vertically; the iron core 3 comprises a core shaft 31 and a pole surface 32 arranged at the upper end of the core shaft; the core shaft 31 of the iron core 3 is fitted in the central hole of the winding shaft 23 of the coil frame 2, and the pole surface 32 of the iron core 3 is located at the middle position of the upper flange 21 of the coil frame 2 corresponding to the width direction of the coil frame 2; the coil lead-out pin 1 is mounted on one side of the lower flange 22 of the coil frame 2 corresponding to the width of the coil frame 2, and the wire A part of the coil lead pin 1 appears in the winding window 24 of the coil frame 2; the static spring part is inserted into the other side of the upper and lower flanges 21 and 22 of the coil frame 2 corresponding to the width of the coil frame 2; the axis of the winding shaft 23 deviates from the center line of the width of the coil frame 2 by a preset distance G in the direction away from the static spring part, so that the axial symmetry center of the core shaft 31 of the core 3 is offset from the axial symmetry center of the pole surface 32 of the core 3 by the preset distance G, so as to increase the spacing between the coil (that is, after the winding shaft 23 is wound with enameled wire) and the static spring, and increase the creepage distance between the coil and the static spring; at the same time, it can also be offset in the direction away from the yoke in the length direction of the coil frame, further increasing the insulation between the coil and the yoke, and improving the insulation capacity. This preset distance should be set in combination with the requirements of the insulation distance and the fullness of the coil winding, so as to ensure that the coil does not exceed the outer periphery of the coil frame after being fully wound, and at the same time ensure that the insulation distance meets the specification requirements.

[0053] Furthermore, it also includes a movable spring armature part 41 and a yoke 42, the yoke 42 is L-shaped, one side of the L-shape of the yoke 42 is fixed to the bottom end of the core shaft 31, and the other side of the L-shape of the yoke 42 corresponds to the winding window 24 of the coil frame 2, the movable spring armature part 41 includes a movable spring piece 411 and an armature 412 bent into an L shape, one side of the movable spring armature part (that is, one side of the L-shape of the movable spring piece 411) is fixed to the other side of the yoke 42, and the other side of the movable spring armature part (that is, the other side of the L-shape of the movable spring piece 411 and the integral part fixed together with the armature 412) corresponds to the top of the pole surface 32 of the iron core 3 at the upper flange 21 of the coil frame 2; the center line of the other side of the movable spring armature part 41 corresponding to the width direction of the coil frame is substantially collinear with the center line of the pole surface 32 of the iron core 3 corresponding to the width direction of the coil frame, so as to ensure the stability of the relay action release.

[0054] In this embodiment, one side of the yoke 42 is provided with a first through hole 421 for positioning the bottom end of the core shaft 31 for assembling the iron core 3, and there is a preset distance G between the center line of one side of the yoke 42 corresponding to the width direction of the coil frame and the center line of the first through hole 421 on one side of the yoke corresponding to the width direction of the coil frame.

[0055] In this embodiment, the pole surface 32 of the iron core 3 is circular, elliptical or rectangular; of course, the cross section of the iron core 3 may also be circular, elliptical or rectangular.

[0056] The static spring part includes an upper static spring 5 (i.e., a normally closed static spring) and a lower static spring 6 (i.e., a normally open static spring), and the upper static spring 5 and the lower static spring 6 are L-shaped respectively; the upper static spring and the lower static spring respectively include a horizontal sheet and a vertical sheet, that is, the upper static spring 5 includes a horizontal sheet 51 and a vertical sheet 52, the horizontal sheet 51 of the upper static spring 5 is equipped with a static contact, and the static contact is arranged downward, and the bottom end of the vertical sheet 52 of the upper static spring 5 is set as a lead pin, and the lower static spring 6 includes a horizontal sheet 61 and a vertical sheet 62, the horizontal sheet 61 of the lower static spring 6 is equipped with a static contact, and the static contact is arranged upward, and the bottom end of the vertical sheet 62 of the lower static spring 6 is set as a lead pin; the vertical sheets 5 of the upper static spring 5 and the lower static spring 6 are provided with a static contact. 2, 62 are respectively inserted into the other side of the upper and lower flanges 21, 22 of the coil frame corresponding to the width of the coil frame 2 relative to the coil lead-out pin, so that the horizontal sheet 51 of the upper static spring 5 and the horizontal sheet 61 of the lower static spring 6 match the part of the moving spring sheet with the moving contact in the moving spring armature part 41, and the part of the moving spring sheet with the moving contact is located between the horizontal sheet 51 of the upper static spring 5 and the horizontal sheet 61 of the lower static spring 6; the parts 521, 621 of the vertical sheets 52, 62 of the upper static spring 5 and the lower static spring 6 that appear in the winding window 24 of the coil frame 2 are both vertical structures and are distributed in parallel along the length direction of the coil frame 2.

[0057] In this embodiment, the thickness direction of the vertical sheets 52 and 62 of the upper static spring 5 and the lower static spring 6 is consistent with the width direction of the coil frame 2; the parts 521 and 621 of the vertical sheets 52 and 62 of the upper static spring 5 and the lower static spring 6 that appear in the winding window 24 of the coil frame 2 are coplanarly distributed on the other side of the width of the coil frame, that is, the part 521 of the vertical sheet 52 of the upper static spring 5 and the part 621 of the vertical sheet 62 of the lower static spring 6 are coplanarly distributed.

[0058] In this embodiment, the upper and lower flanges 21, 22 of the coil frame 2 are respectively provided with annular closed second through holes 25 and third through holes 26 for inserting the vertical sheets 52, 62 of the upper static spring 5 and the lower static spring 6, so that the upper static spring 5 and the lower static spring 6 can only be inserted into the coil frame 2 from the top of the coil frame downward. There are two second through holes 25, which respectively match the upper static spring 5 and the lower static spring 6, and there are also two third through holes 26, which respectively match the upper static spring 5 and the lower static spring 6.

[0059] In this embodiment, since the cross-section of the vertical sheets 52 and 62 of the upper static spring 5 and the lower static spring 6 is rectangular, the shapes of the second through hole 25 and the third through hole 26 are also rectangular, and the lengths of the second through hole 25 and the third through hole 26 are adapted to the widths of the vertical sheets 52 and 62 of the upper static spring 5 and the lower static spring 6, and the widths of the second through hole 25 and the third through hole 26 are adapted to the thicknesses of the vertical sheets 52 and 62 of the upper static spring 5 and the lower static spring 6, and the width of the second through hole 25 is greater than the width of the third through hole 26, and the vertical sheets of the upper static spring 5 and the lower static spring 6 are A clamping convex 522, 622 fixed to the corresponding third through hole 26 is provided on one surface of the lower part of the body 52, 62 in the thickness direction, and the upper static spring 5 and the lower static spring 6 are fixed to the coil frame 2 through the clamping convex 522, 622 of the lower part of the vertical sheet 52, 62 and the corresponding third through hole 26 of the lower flange 22 of the coil frame 2, and the horizontal sheet 51, 61 of the upper static spring 5 and the lower static spring 6 are completely exposed on the upper flange 21 of the coil frame 2, that is, there is no plastic around the static spring contact surface, and the coil frame plastic is lower than the static spring contact surface. In this embodiment, the width of the second through hole 25 is also designed to be greater than the thickness of the vertical sheet 52, 62 of the upper static spring 5 and the lower static spring 6, which can avoid the generation of plastic shavings on the upper part when the upper static spring 5 and the lower static spring 6 are inserted.

[0060] In this embodiment, a surface in the thickness direction of the upper part of the vertical sheet 52, 62 of the upper static spring 5 and the lower static spring 6 is provided with a positioning protrusion 523, 623 that cooperates with the corresponding second through hole 25. The upper static spring 5 and the lower static spring 6 are adjusted in position on the coil frame 2 by cooperating with the corresponding second through hole 25 of the upper flange 21 of the coil frame 2 through the positioning protrusion 523, 623 on the upper part of the vertical sheet 52, 62.

[0061] In this embodiment, at the top of the vertical sheets 52 and 62 of the upper static spring 5 and the lower static spring 6, cut cross sections 524 and 624 of the static spring material are provided next to the positions integrally connected with the horizontal sheets 51 and 61, so as to provide a pressing position for the preset corresponding tooling, so as to press the upper static spring 5 and the lower static spring 6 into the coil frame 2, and the pressing position is roughly collinear with the clamping bulges 522 and 622 of the vertical sheets in the height direction corresponding to the coil frame; and the positioning bulges 523 and 623 are also roughly collinear, that is, in the upper static spring 5, the cut cross section 524, the positioning bulge 523 and the clamping bulge 522 are roughly collinear, and in the lower static spring 6, the cut cross section 624, the positioning bulge 623 and the clamping bulge 622 are also roughly collinear.

[0062] In this embodiment, a sink 221 lower than the winding window is provided in the lower flange 22 of the coil frame 2 at the insertion position corresponding to the upper static spring 5 and the lower static spring 6 on the side corresponding to the winding window 23 of the coil frame 2, so as to further increase the creepage distance between this position and the enameled wire; an oblique chamfer is provided between the sink 221 and the winding window 24, and the chamfer edge is flush with the third through hole 26. By providing the chamfer, the generation of plastic scraps at this location can be reduced.

[0063] In this embodiment, a first groove 211 is provided in the upper flange 21 of the coil frame 2, between the horizontal sheet 61 of the lower static spring 6 and the vertical sheet 52 of the upper static spring 5, near the vertical sheet 52 of the upper static spring 5, and the first groove 211 is provided along the length direction of the coil frame 2, and the length dimension of the first groove 211 is greater than the width dimension of the vertical sheet 52 of the upper static spring 5. The first groove 211 can further reduce the possibility of contact splashes accumulating on the upper static spring and the lower static spring.

[0064] In this embodiment, a retaining wall 27 is further provided between two second through holes 25 on the upper flange 21 of the coil frame 2 to increase the insulation distance between the upper static spring 5 and the lower static spring 6 .

[0065] In this embodiment, in the lower flange 22 of the coil frame 2, in a side corresponding to the winding window 23 of the coil frame 2, a second groove 222 is further provided between the coil lead pin 1 and the insertion position of the upper static spring 5 and the lower static spring 6. The second groove 222 can increase the creepage distance, ensure uniform shrinkage, and avoid shrinkage deformation.

[0066] A high-insulation small-sized snap-on electromagnetic relay of the present invention adopts the method of arranging the pole face 32 of the iron core 3 at the middle position of the upper flange 21 of the coil frame 2 corresponding to the width direction of the coil frame 2; installing the coil lead pin 1 on one side of the lower flange 22 of the coil frame 2 corresponding to the width of the coil frame 2, and inserting the static spring part on the other side of the upper and lower flanges 21, 22 of the coil frame 2 corresponding to the width of the coil frame 2; and designing the axis of the winding shaft 23 to deviate from the center line of the width of the coil frame 2 in the direction away from the static spring part by a preset distance, so that the axial symmetry center of the core axis 31 of the iron core 3 is offset from the axial symmetry center of the pole face 32 of the iron core by the preset distance. This structure of the present invention, by keeping the pole surface 32 of the iron core 3 at the axial symmetric center of the product, eccentrically sets the winding shaft of the coil frame and the core shaft 31 of the iron core 3, so that the coil (that is, after the winding shaft is wound with enameled wire) is eccentric as a whole and biased to the side away from the static spring part. On the basis of not affecting the balance of the magnetic circuit, it is possible to increase the distance between the coil and the static spring, thereby increasing the creepage distance between the coil and the static spring and improving the insulation capacity.

[0067] A high-insulation small-sized snap-on electromagnetic relay of the present invention adopts an eccentric arrangement of the winding shaft 23 of the coil frame 2. When the ampere-turns of the coil remain unchanged, the distance between the coil and the static spring can be increased, the creepage distance can be increased, and the voltage resistance performance can be improved; at the same time, the coil frame can also be offset in the direction away from the yoke iron in the length direction to further increase the insulation between the coil and the yoke iron. When the distance between the coil and the static spring is sufficient and does not need to be increased, the number of coil turns can be increased, the ampere-turns value can be increased, the contact suction force can be improved, and then the contact pressure can be increased, the rebound can be reduced, the contact stability can be ensured, the arc can be reduced, and the life and reliability of the contact can be improved.

[0068] A high-insulation small-sized snap-on electromagnetic relay of the present invention adopts an eccentric arrangement of the winding shaft 23 of the coil frame 2, and is biased to the side away from the static spring part, so as to make room for the static spring to be assembled on the coil frame 2; the present invention further adopts the vertical sheets 52, 62 of the upper static spring 5 and the lower static spring 6, the parts 521, 621 of which appear in the winding window of the coil frame are both vertical structures and are distributed in parallel along the length direction of the coil frame 2, and the parts 521, 621 of the vertical sheets of the upper static spring 5 and the lower static spring 6 that appear in the winding window of the coil frame are coplanarly distributed on the other side of the width of the coil frame. This structure of the present invention can reduce the difficulty of making the static spring while ensuring the insulation distance between the static spring and the coil; the parts 521, 621 of the upper static spring and the lower static spring that appear in the winding window of the coil frame are both vertical structures, avoiding the disadvantages caused by the bending treatment of the static spring in the prior art, reducing the manufacturing process, and at the same time, reducing the size of the relay to achieve miniaturization.

[0069] A high-insulation small-sized snap-on electromagnetic relay of the present invention adopts a second through hole 25 and a third through hole 26 respectively provided on the upper and lower flanges 21 and 22 of the coil frame for inserting the vertical sheets 52 and 62 of the upper static spring 5 and the lower static spring 6, so that the upper static spring 5 and the lower static spring 6 are inserted into the coil frame 2 from the top of the coil frame 2. Since the static spring is pressed in from top to bottom, which is the direction that affects the contact gap and overtravel of the relay, the mechanical parameters of the relay can be adjusted in real time by automatically adjusting the position of the static spring when pressing in, which can effectively improve the qualified rate of the parameters and reduce the dependence on the accuracy of the coil frame parts; at the same time, this installation method from top to bottom is also convenient for automatic assembly.

[0070] A high-insulation small-sized snap-on electromagnetic relay of the present invention adopts a clamping bulge 522, 622 fixed to the corresponding third through hole on one surface in the thickness direction of the lower part of the vertical sheet 52, 62 of the upper static spring 5 and the lower static spring 6. The upper static spring 5 and the lower static spring 6 are fixed to the coil frame by matching the clamping bulge 522, 622 at the lower part of the vertical sheet with the corresponding third through hole 26 of the lower flange 22 of the coil frame. Since the clamping position of the static spring and the coil frame is at the bottom of the coil frame, facing away from the contact mechanism, and there is a large plastic surface in the middle for isolation, plastic foreign matter at the clamping position is not easily transferred to the contact position; in addition, since there is no need to position the position close to the contact surface by the static spring as in the prior art, the plastic of the coil frame at this location can be removed, so that there is no excess plastic around the contact, and the splashes generated during the use of the contact can be distributed away from the contact, reducing the impact on the insulation between the disconnected contacts; after removing the plastic of the coil frame at this location, the design of the plastic height of this part can be reduced, and when the overall height of the relay remains unchanged, the saved space can be given to the coil frame winding space, so that the coil can obtain more ampere-turns without affecting the insulation distance, which is beneficial to improving the comprehensive performance of the relay.

[0071] A high-insulation small-sized snap-on electromagnetic relay of the present invention adopts a cut-off cross section 524, 624 of the static spring material provided at the top of the vertical sheet 52, 62 of the upper static spring 5 and the lower static spring 6, beside the position integrally connected with the horizontal sheet 51, 61, to provide a pressing position for the preset corresponding tooling, to press the upper static spring 5 and the lower static spring 6 into the coil frame, and the pressing position is roughly collinear with the clamping convex buds 522, 622 of the vertical sheet in the height direction corresponding to the coil frame. This structure of the present invention can make the static spring not generate deflection torque when pressing into the coil frame, so as to improve the accuracy of the pressing position.

[0072] 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 a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to 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 high-insulation small-sized snap-on electromagnetic relay, comprising a coil frame, a coil lead-out pin, an iron core and a static spring portion; the coil frame has upper and lower flanges and a winding shaft connected between the upper and lower flanges and used to wind the enameled wire, the axis of the winding shaft being arranged vertically; the iron core comprises a core shaft and a pole surface arranged at the upper end of the core shaft; the core shaft of the iron core fits in the central hole of the winding shaft of the coil frame, and the pole surface of the iron core is located in the middle position of the upper flange of the coil frame corresponding to the width direction of the coil frame; the coil lead-out pin is installed on one side of the lower flange of the coil frame corresponding to the width of the coil frame, and a part of the coil lead-out pin appears in the winding window of the coil frame; the static spring portion is inserted into the other side of the upper and lower flanges of the coil frame corresponding to the width of the coil frame; it is characterized in that: The axis of the winding shaft deviates from the center line of the width of the coil frame by a preset distance in the direction away from the static spring part, so that the axial symmetry center of the core axis of the iron core is offset from the axial symmetry center of the pole surface of the iron core by the preset distance, so as to increase the spacing between the coil and the static spring, increase the creepage distance between the coil and the static spring, and improve the insulation capacity.

2. The high-insulation small-sized snap-on electromagnetic relay according to claim 1, characterized in that: Furthermore, it also includes a movable spring armature part and a yoke, one side of the yoke is fixed to the bottom end of the core shaft, and the other side of the yoke corresponds to the winding window of the coil frame, one side of the movable spring armature part is fixed to the other side of the yoke, and the other side of the movable spring armature part corresponds to the top of the pole surface of the iron core at the upper flange of the coil frame; the center line of the other side of the movable spring armature part corresponding to the width direction of the coil frame is substantially collinear with the center line of the pole surface of the iron core corresponding to the width direction of the coil frame.

3. The high-insulation small-sized snap-on electromagnetic relay according to claim 2, characterized in that: One side of the yoke is provided with a first through hole for positioning the bottom end of the core shaft for assembling the iron core, and there is a preset distance between the center line of one side of the yoke corresponding to the width direction of the coil frame and the center line of the first through hole on one side of the yoke corresponding to the width direction of the coil frame.

4. The high-insulation small-sized snap-on electromagnetic relay according to claim 1, characterized in that: The pole surface of the iron core is circular, elliptical or rectangular.

5. The high-insulation small-sized snap-on electromagnetic relay according to claim 1, characterized in that: The static spring part includes an upper static spring and a lower static spring, and the upper static spring and the lower static spring are L-shaped respectively; the vertical sheets of the upper static spring and the lower static spring are respectively inserted into the upper and lower flanges of the coil frame corresponding to the width of the coil frame on the other side relative to the coil lead-out pin; the parts of the vertical sheets of the upper static spring and the lower static spring that appear in the winding window of the coil frame are all vertical structures and are distributed in parallel along the length direction of the coil frame.

6. The high-insulation small-sized snap-on electromagnetic relay according to claim 5, characterized in that: The thickness direction of the vertical sheets of the upper static spring and the lower static spring is consistent with the width direction of the coil frame; The portions of the vertical sheets of the upper static spring and the lower static spring that appear in the winding window of the coil frame are distributed in a coplanar manner on the other side of the width of the coil frame.

7. The high-insulation small-sized snap-on electromagnetic relay according to claim 5, characterized in that: The upper and lower flanges of the coil frame are respectively provided with annular closed second and third through holes for inserting the vertical sheets of the upper and lower static springs, so that the upper and lower static springs can only be inserted into the coil frame from the top downward.

8. The high-insulation small-sized snap-on electromagnetic relay according to claim 7, characterized in that: The width of the second through hole is greater than that of the third through hole, and a surface in the thickness direction of the lower part of the vertical sheet of the upper static spring and the lower static spring is provided with a clamping convex bump fixed to the corresponding third through hole, and the upper static spring and the lower static spring are fixed to the coil frame by the clamping convex bump at the lower part of the vertical sheet and the corresponding third through hole of the lower flange of the coil frame, and the horizontal sheet of the upper static spring and the lower static spring is completely exposed on the upper flange of the coil frame; a surface in the thickness direction of the upper part of the vertical sheet of the upper static spring and the lower static spring is provided with a positioning convex bump matched with the corresponding second through hole, and the upper static spring and the lower static spring are adjusted on the coil frame by the positioning convex bump at the upper part of the vertical sheet and the corresponding second through hole of the upper flange of the coil frame.

9. The high-insulation small-sized snap-on electromagnetic relay according to claim 5, characterized in that: At the top end of the vertical sheet of the upper static spring and the lower static spring, a cut cross section of the static spring material is provided next to the position where it is integrally connected to the horizontal sheet, so as to provide a pressing position for the preset corresponding tooling, so as to press the upper static spring or the lower static spring into the coil frame, and the pressing position is roughly collinear with the clamping bulge of the vertical sheet in the height direction corresponding to the coil frame.

10. The high-insulation small-sized snap-on electromagnetic relay according to claim 7, characterized in that: In the lower flange of the coil frame, a sinker lower than the winding window is provided at the insertion position corresponding to the upper static spring and the lower static spring on a side corresponding to the winding window of the coil frame, so as to further increase the creepage distance between this position and the enameled wire; an oblique chamfer is provided between the sinker and the winding window, and the chamfer edge is flush with the third through hole; in the upper flange of the coil frame, a first groove is provided between the horizontal sheet of the lower static spring and the vertical sheet of the upper static spring, near the vertical sheet of the upper static spring, and the first groove is provided along the length direction of the coil frame, and the length dimension of the first groove is greater than the width dimension of the vertical sheet of the upper static spring; in the lower flange of the coil frame, a second groove is provided between the coil lead-out pin and the insertion position of the upper static spring and the lower static spring on a side corresponding to the winding window of the coil frame.

11. The high-insulation small-sized snap-on electromagnetic relay according to claim 7, characterized in that: In the upper flange of the coil frame, a retaining wall is also provided between the two second through holes above the upper flange to increase the insulation distance between the upper static spring and the lower static spring.

Images