Clapper type electromagnetic relay

Abstract

The utility model relates to a clapper type electromagnetic relay which comprises a base, a magnetic circuit part and a contact part. The magnetic circuit part is mounted on the base, and the contact part comprises a movable spring and a static spring; the magnetic circuit part comprises a coil, an armature and a yoke, the movable spring and the armature are integrally injection-molded through an insulating part, one end of the movable spring is embedded in the insulating part, and the other end of the movable spring extends out of the insulating part towards one side where the base is located; the insulating part comprises a main body part and an extension part which are integrally formed, the main body part is connected with the armature, the extension part extends from the main body part to the side where the base is located, and the extension part is arranged at an interval relative to at least one of the movable spring and the armature in the clapping direction of the movable spring. According to the clapper type electromagnetic relay, the creepage distance between the movable spring and the armature can be increased on the surface of the extension part by utilizing the gap between the extension part relative to the movable spring and / or the armature under the condition that the distance between the movable spring and the armature is kept unchanged, so that the creepage distance and / or the electrical gap can be increased while the miniaturization is maintained.

Description

Technical Field

[0001] The present application relates to the technical field of relays, and in particular to a snap-on electromagnetic relay. Background Art

[0002] With the development of relay technology, relay products are widely used in household appliances, new energy vehicles and other products.

[0003] In the related art, the creepage distance between the strong current part (such as the dynamic spring) of the relay through the armature (conductor) and the yoke (conductor) and the weak current part (such as the coil lead-out plate) is short, resulting in its inability to meet the creepage requirements of the high voltage gear. Although the creepage distance can be increased by separating the dynamic spring from the armature with an insulator, the effect of this structural setting is limited, and there is still the situation where the creepage distance and / or electrical clearance do not meet the standards. For this reason, other more complex structures have to be set to increase the creepage distance, resulting in a complex structure of the snap-on electromagnetic relay, which is not conducive to the miniaturization of the structure. Utility Model Content

[0004] Based on this, a clap-type electromagnetic relay is provided to solve the problem of how to increase creepage distance and / or electrical clearance while taking into account miniaturization.

[0005] The present application provides a snap-on electromagnetic relay, comprising a base, a magnetic circuit portion and a contact portion; the magnetic circuit portion is mounted on the base, the contact portion comprising a movable spring and a static spring; the magnetic circuit portion comprises a coil, an armature and a yoke, the armature being connected to the yoke and being used to drive the movable spring to snap into contact with or disconnect from the static spring; the snap-on electromagnetic relay comprises an insulating component, the movable spring and the armature being integrally injection-molded through the insulating component, one end of the movable spring being embedded in the insulating component, and the other end extending from the insulating component toward the side where the base is located; the insulating component comprises a main body portion and an extension portion integrally formed therein, the main body portion being connected to the armature, the extension portion extending from the main body portion toward the side where the base is located, and in the snap-on direction of the movable spring, the extension portion is located between the movable spring and the armature, and the extension portion is spaced apart relative to at least one of the movable spring and the armature.

[0006] In one embodiment, at least part of the structure of the extension portion is covered on a side of the armature facing the movable spring, one end of the movable spring is buried in the main body, and a portion of the movable spring exposed from the main body is spaced apart from the extension portion.

[0007] In one embodiment, the insulating component includes a covering portion covering the bottom end of the armature, and the covering portion is protruded on a side of the extending portion facing away from the movable spring.

[0008] In one embodiment, a slope is formed on the bottom end of the armature, and the gap between the portion of the extension covering the slope and the movable spring gradually increases in a direction approaching the base.

[0009] In one embodiment, at least a portion of the extension portion covers a side of the movable spring facing the armature, the extension portion is spaced relative to the armature, and a bottom end of the extension portion extends beyond a bottom end of the armature;

[0010] Alternatively, part of the structure of the main body protrudes from the side of the extension portion facing away from the armature to form a protrusion, one end of the movable spring is embedded in the protrusion, and the movable spring and the armature are both spaced apart from the extension portion.

[0011] In one embodiment, a first through-hole is provided in the middle of the armature, and the insulating component includes an embedding portion connected to the main body, and the embedding portion cooperates with the first through-hole; a second through-hole is provided at the end of the movable spring, and part of the structure of the insulating component is embedded in the second through-hole.

[0012] In one embodiment, in the flapping direction of the movable spring, a portion of the movable spring embedded in the insulating component and the embedded portion overlap with each other.

[0013] In one embodiment, the insulating component forms a first creepage path and a second creepage path, the first creepage path extends from the side of the movable spring facing away from the armature along a portion of the surface of the insulating component and to the side of the armature facing the movable spring, the second creepage path extends from the side of the movable spring facing the armature along a portion of the surface of the insulating component to the side of the armature facing away from the movable spring, the length of the first creepage path and the length of the second creepage path are both greater than or equal to 10 mm; and / or, the electrical gap between the movable spring and the armature is greater than or equal to 5.5 mm.

[0014] In one embodiment, the snap-on electromagnetic relay further includes a coil lead-out piece electrically connected to the coil, the static spring includes a static spring lead-out piece, the base is provided with a first socket and a second socket, the coil lead-out piece and the static spring lead-out piece extend out of the base through the first socket and the second socket respectively, wherein the shortest distance from the first socket to the yoke is greater than the shortest distance from the second socket to the yoke.

[0015] In one embodiment, the static spring also includes a connecting portion and a static contact. The connecting portion is horizontally bent relative to the vertically arranged static spring lead-out piece so as to be in contact with the base and extend toward the side where the dynamic spring is located. The dynamic spring is provided with a dynamic contact opposite to the static contact. The static contact is located at an end of the connecting portion away from the static spring lead-out piece. When the armature drives the dynamic spring to snap together, the dynamic contact contacts or disconnects from the static contact.

[0016] In one embodiment, the number of the static springs and the number of the coil lead-out pieces are both 2, the base is provided with 2 first jacks and 2 second jacks, the 2 coil lead-out pieces are respectively correspondingly inserted into the 2 first jacks, the 2 static springs are arranged side by side in a direction perpendicular to the flapping direction of the armature, and the static spring lead-out pieces of the 2 static springs are respectively correspondingly inserted into the 2 second jacks; the flapping type electromagnetic relay also includes an insulating cover, which is used for electrical isolation between the 2 static springs and between the static spring and the coil lead-out piece.

[0017] In one embodiment, the insulating cover covers the connecting portion, and the insulating cover is formed with a plug-in portion and a surrounding wall portion, the coil lead-out piece is inserted into the plug-in portion, the surrounding wall portion is clamped between the coil lead-out piece and the static contact, and the plug-in portion cooperates with the first socket.

[0018] In one embodiment, a glue dispensing groove surrounding the coil lead-out piece is formed on the side of the base facing away from the insulating cover, and the glue dispensing groove is provided with a glue injection part, and the glue injection part is sealed around the coil lead-out piece. The glue injection part fills the gap between the coil lead-out piece and the side wall of the first socket, and the glue injection part is sealed and abutted against the plug-in part.

[0019] In one embodiment, at least one of the base and the insulating cover is provided with a retaining wall, and the retaining wall is located between the static contacts of the two static springs;

[0020] And / or, one of the insulating cover and the base is provided with a partition, and the other one is provided with a partition groove, and the partition plate cooperates with the partition groove and is located between the connecting parts of the two static springs.

[0021] In the aforementioned snap-action electromagnetic relay, the movable spring and armature are integrally injection-molded through an insulating component, thereby reducing assembly steps between the movable spring and armature and improving production efficiency. The insulating component includes a main body and an extension portion, the main body being connected to the armature. The extension portion extends from the main body toward the base. In the snap-action direction of the movable spring, the extension portion is spaced relative to at least one of the movable spring and the armature. This maintains the spacing between the movable spring and the armature, while also allowing for a compact design. The gap between the extension portion and the movable spring and / or the armature increases the creepage distance between the movable spring and the armature on the surface of the extension portion. This allows the creepage distance and / or electrical clearance between the movable spring (high-current component) in the contact portion, through the armature (conductor) and yoke (conductor) to the coil (low-current component), to more easily meet the electrical isolation requirements for high-current and low-current, thereby facilitating the use of the snap-action electromagnetic relay in high-voltage environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0023] Figure 1 Schematic diagram of the three-dimensional structure of a snap-on electromagnetic relay according to one embodiment of the present application.

[0024] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of a snap-on electromagnetic relay from another perspective is shown.

[0025] Figure 3 This is a side structural schematic diagram of a snap-on electromagnetic relay according to one embodiment of the present application.

[0026] Figure 4 for Figure 3 The cross-sectional structure diagram of the snap-on electromagnetic relay along line II is shown.

[0027] Figure 5 This is a structural schematic diagram of a snap-on electromagnetic relay according to an embodiment of the present application, in which a movable spring and an armature are integrally formed through an insulating component.

[0028] Figure 6 for Figure 5 The diagram shows a front structural diagram of a snap-type electromagnetic relay in which a movable spring and an armature are integrally formed through an insulating component.

[0029] Figure 7 An electromagnetic relay according to an embodiment of the present invention Figure 6The cross-sectional structure diagram of line II-II in FIG. Figure 7 (a), (b) and (c) in the drawing respectively show the structures of the insulating component according to different embodiments.

[0030] Figure 8 This is a schematic diagram of the assembly structure of the static spring and the base in a snap-on electromagnetic relay according to one embodiment of the present application.

[0031] Figure 9 This is a schematic three-dimensional structural diagram of a snap-on electromagnetic relay according to another embodiment of the present application.

[0032] Figure 10 for Figure 9 A schematic diagram of the three-dimensional structure of a snap-on electromagnetic relay from another perspective is shown.

[0033] Figure 11 for Figure 9 The side view structural diagram of the snap-on electromagnetic relay is shown.

[0034] Figure 12 for Figure 11 The schematic cross-sectional structure diagram of the snap-on electromagnetic relay along line III-III is shown.

[0035] Figure 13 for Figure 9 The exploded structure diagram of the snap-on electromagnetic relay is shown.

[0036] Figure 14 for Figure 13 The diagram shows a top view of the structure of the insulating cover of the snap-on electromagnetic relay assembled with a base equipped with a static spring.

[0037] Figure 15 for Figure 14 A schematic cross-sectional view of a partial structure of a snap-on electromagnetic relay along line IV-IV is shown.

[0038] Figure 16 Schematic diagram of the cross-sectional structure of a snap-on electromagnetic relay in an assembled state according to one embodiment of the present application.

[0039] Figure 17 for Figure 16 The diagram shows a cross-sectional structure of the first and second glue dispensing grooves of the snap-on electromagnetic relay when they are filled with glue.

[0040] Figure 18 This is a schematic cross-sectional view of a snap-on electromagnetic relay according to another embodiment of the present application.

[0041] Description of reference numerals:

[0042] 10. Base; 11. First jack; 13. Second jack; 15. First dispensing slot; 151. Dispensing element; 17. Second dispensing slot; 19. Third dispensing slot; 101. Retaining wall; 103. Partition; 105. Fixing portion; 105a. Slot; 20. Magnetic circuit; 21. Coil; 21a. Coil support; 21b. Terminal; 211. Enameled wire; 23. Armature; 23a. Bottom end; 23b. Inclined surface; 23c. First through-hole; 25. Yoke; 25a. Insert; 26. Core; 27. Elastic Component; 29, coil lead-out piece; 29a, wiring portion; 30, contact portion; 31, moving spring; 31a, moving contact; 31b, second through-hole; 33, static spring; 33a, static contact; 33b, static spring lead-out piece; 33c, connecting portion; 40, insulating component; 41, main body; 413, protrusion; 43, extension; 45, covering portion; 47, embedded portion; R1, first creepage path; R2, second creepage path; 50, insulating cover; 51, plug-in portion; 53, surrounding wall portion; 55, partition; 60, housing. DETAILED DESCRIPTION

[0043] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0045] The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions are for illustrative purposes only and do not represent the only implementations.

[0046] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0047] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0048] See Figure 1 and Figure 2 As shown, an embodiment of the present application provides a snap-on electromagnetic relay comprising a base 10, a magnetic circuit portion 20, and a contact portion 30. The base 10 provides a mounting support for the magnetic circuit portion 20 and the contact portion 30; the magnetic circuit portion 20 is used to drive the contact portion 30 to make or break contact through electromagnetic action.

[0049] Combine Figure 3 and Figure 4 As shown, the magnetic circuit portion 20 is mounted on the base 10, and the contact portion 30 includes a movable spring 31 and a static spring 33. The magnetic circuit portion 20 includes a coil 21, an armature 23, and a yoke 25. The armature 23 is connected to the yoke 25 and is used to drive the movable spring 31 to engage or disengage with the static spring 33.

[0050] The yoke 25 may be L-shaped, with one end of the yoke 25 connected to the base 10 and the other end cooperating with the armature 23. The armature 23 and the yoke 25 together enclose a space above the base 10 for arranging the coil 21. In some embodiments, the coil 21 includes a coil holder 21a and an enameled wire 211. The magnetic circuit portion 20 further includes an iron core 26. The iron core 26 is connected to the yoke 25. The connection between the iron core 26 and the yoke 25 includes, but is not limited to, welding or riveting. The coil holder 21a has a sleeve portion for winding the enameled wire 211. The sleeve portion is sleeved on the iron core 26, so that the enameled wire 211 wound on the sleeve portion surrounds the iron core 26. When current passes through the enameled wire 211, the iron core 26 can enhance the magnetic field strength to better magnetically attract the armature 23 to move relative to the yoke 25. As can be understood, in a snap-action relay, when current flows through the coil 21, it creates a magnetic field that attracts the armature 23. Thus, by controlling the power supply to the coil 21, the armature 23 can be moved relative to the yoke 25, driving the movable spring 31 into snapping contact with the static spring 33. An elastic member 27 is disposed between the yoke 25 and the armature 23, and the elastic member 27 includes, but is not limited to, a spring or an elastic cord. When the power supply to the coil 21 is removed, the coil 21 no longer exerts a magnetic attraction on the armature 23. At this point, the elastic member 27 forces the armature 23 to return relative to the yoke 25, breaking contact between the armature 23 and the movable spring 31 and the static spring 33.

[0051] It is understood that the contact point between the movable spring 31 and the static spring 33 can be referred to as a contact point or contact head. For ease of description, in this application, the portion of the movable spring 31 that contacts the static spring 33 is referred to as the "moving contact 31a"; correspondingly, the portion of the static spring 33 that contacts the movable spring 31 is referred to as the "static contact 33a." Thus, contact between the movable spring 31 and the static spring 33 refers to the contact between the movable contact 31a and the static contact 33a, thereby establishing electrical contact between the movable spring 31 and the static spring 33. When a clap-type relay is connected to a load device, the movable spring 31 and the static spring 33 are electrically conductive and conduct current. Because the voltage connected to the coil 21 in a clap-type relay is much lower than the voltage connected to the movable spring 31 and the static spring 33, the portion containing the coil 21 is generally referred to as the weak-current portion, while components such as the movable spring 31 and the static spring 33 that connect to higher voltages are referred to as the strong-current portion. Maintaining good electrical isolation between the weak-current and strong-current portions is a fundamental requirement for the proper operation of a clap-type relay. Therefore, the structural components of the weak and strong current parts of a clap-type relay must meet creepage distance and electrical clearance requirements. However, in related art, to meet creepage distance requirements, large insulating components are required to separate the strong and weak current parts, making the clap-type relay bulky and unfavorable for miniaturization.

[0052] In the snap-on electromagnetic relay of the embodiment of the present application, Figures 5 to 7 As shown, the snap-action electromagnetic relay includes an insulating component 40, through which the movable spring 31 and the armature 23 are integrally injection-molded. This reduces the number of assembly steps between the movable spring 31 and the armature 23 and improves production efficiency. One end of the movable spring 31 is embedded in the insulating component 40, and the other end extends from the insulating component 40 toward the side where the base 10 is located.

[0053] The insulating component 40 includes an integrally formed main portion 41 and an extension portion 43. The main portion 41 is connected to the armature 23. The extension portion 43 extends from the main portion 41 toward the side of the base 10. In the snapping direction of the movable spring 31, the extension portion 43 is located between the movable spring 31 and the armature 23, and is spaced relative to at least one of the movable spring 31 and the armature 23. This maintains the spacing between the movable spring 31 and the armature 23, allowing for a compact design. The gap between the extension portion 43 and the movable spring 31 and / or the armature 23 increases the creepage distance between the movable spring 31 and the armature 23 on the surface of the extension portion 43. This allows the creepage distance and / or electrical clearance between the movable spring 31 (high-current component) in the contact portion 30, through the armature 23 (conductor) and yoke 25 (conductor) to the coil 21 (low-current component), to more easily meet the electrical isolation requirements between high-current and low-current components, thereby facilitating the use of the snap-action electromagnetic relay in high-voltage environments.

[0054] Combine Figure 7As shown in Figure (a), in some embodiments, at least a portion of the extension 43 covers the side of the armature 23 facing the movable spring 31. One end of the movable spring 31 is embedded in the main body 41, and the portion of the movable spring 31 exposed from the main body 41 is spaced apart from the extension 43. In this embodiment, the creepage path of the side of the movable spring 31 facing the armature 23 toward the armature 23 passes through the surface of the extension 43. Therefore, the spacing between the extension 43 and the main body 41 can utilize the surface of the extension 43 to increase the creepage distance and / or electrical clearance between the movable spring 31 and the armature 23.

[0055] Furthermore, the insulating component 40 includes a covering portion 45 that covers the bottom end 23a of the armature 23 (i.e., the end away from the yoke 25). The covering portion 45 is provided protrudingly on the side of the extension portion 43 facing away from the dynamic spring 31. In this embodiment, the covering portion 45 covering the bottom end 23a of the armature 23 can increase the creepage distance and / or electrical clearance between the dynamic spring 31 and the armature 23.

[0056] The bottom end 23a of the armature 23 is formed with a sloped surface 23b. As it approaches the base 10, the gap between the portion of the extension 43 that overlaps the sloped surface 23b and the movable spring 31 gradually increases. This structural arrangement allows the extension 43 to extend at an angle away from the movable spring 31. This allows the extension 43 to extend longer while maintaining its vertical height. Consequently, this structural arrangement utilizes the sloped surface 23b to increase the creepage distance between the movable spring 31 and the armature 23 on the surface of the extension 43 while maintaining a compact overall connection between the movable spring 31 and the armature 23.

[0057] It should be noted that the insulating component 40 is not limited to the extension portion 43 covering the side of the armature 23 facing the dynamic spring 31 , and the gap between the extension portion 43 and the dynamic spring 31 is used to increase the creepage distance and / or electrical gap.

[0058] For example, combined with Figure 7 As shown in FIG. (b), in another embodiment, at least part of the extension portion 43 is covered on the side of the movable spring 31 facing the armature 23, the extension portion 43 is spaced relative to the armature 23, and the bottom end 23a of the extension portion extends beyond the bottom end 23a of the armature 23. For another example, in combination with Figure 7 As shown in Figure (c), part of the structure of the main body 41 protrudes from the side of the extension 43 facing away from the armature 23 to form a protrusion 413. One end of the movable spring 31 is buried in the protrusion 413. The movable spring 31 and the armature 23 are both spaced apart from the extension 43.

[0059] In the above embodiment, the extension portion 43 is spaced apart from the movable spring 31 and / or the armature 23 to form a gap, so that at least part of the surface of the extension portion 43 is located on the creepage path between the movable spring 31 and the armature 23, thereby increasing the creepage distance and / or electrical clearance between the movable spring 31 and the armature 23 by utilizing the surface of the extension portion 43. Figure 7 Taking the insulating component 40 shown in FIG. 1 ( a ) as an example in which the movable spring 31 and the armature 23 are integrally injection-molded, the structure of the snap-action electromagnetic relay is further described.

[0060] Combine Figure 7 As shown in FIG. (a), the insulating component 40 is formed with a first creepage path R1 and a second creepage path R2. Figure 7 Figure (a) shows the first creepage path R1 with dotted arrows, and the second creepage path R2 with solid arrows. Specifically, the first creepage path R1 extends from the side of the movable spring 31 facing away from the armature 23, along a portion of the surface of the insulating component 40, to the side of the armature 23 facing the movable spring 31. The second creepage path R2 extends from the side of the movable spring 31 facing the armature 23, along a portion of the surface of the insulating component 40, to the side of the armature 23 facing away from the movable spring 31. The lengths of the first creepage path R1 and the second creepage path R2 are both greater than or equal to 10 mm. The electrical clearance between the movable spring 31 and the armature 23 is greater than or equal to 5.5 mm, ensuring that the creepage distance (i.e., the length of the shortest creepage path) and the electrical clearance between the movable spring 31 and the armature 23 meet the creepage safety requirements for higher voltage ranges (e.g., 1000 V).

[0061] There is no limitation on the dimensions of the main body 41 and the extension 43 of the insulating component 40. As long as the dimensions of the insulating component 40 meet the corresponding creepage requirements, the insulating component 40 in the snap-fit ​​electromagnetic relay of the present application can be used to injection-mold the movable spring 31 and the armature 23 into one piece, thereby increasing the creepage distance between the movable spring 31 and the armature 23 while taking into account the requirements of miniaturization design.

[0062] Continue to combine Figure 7 As shown, in some embodiments, a first through-hole 23c is provided in the middle of the armature 23, and the insulating component 40 includes an engaging portion 47 connected to the main body 41. The engaging portion 47 engages with the first through-hole 23c. In this embodiment, the engagement between the first through-hole 23c and the engaging portion 47 helps improve the fit stability between the main body 41 and the armature 23, thereby reducing the chance of the main body 41 falling off the armature 23.

[0063] A second through hole 31 b is provided at the end of the movable spring 31 . Since the end of the movable spring 31 is embedded in the insulating component 40 , a portion of the insulating component 40 is embedded in the second through hole 31 b to increase the connection stability between the movable spring 31 and the insulating component 40 .

[0064] In the closing direction of the movable spring 31, the portion of the movable spring 31 embedded in the insulating component 40 overlaps with the interlocking portion 47. In other words, the portion of the movable spring 31 that is bonded to the insulating component 40 covers the interlocking portion 47. In this embodiment, the insulating component 40 can provide a buffering effect between the movable spring 31 and the armature 23. For example, when the armature 23 drives the movable spring 31 into contact with the static spring 33, the static spring 33 generates a reaction force on the movable spring 31. The portion of the movable spring 31 that is bonded to the insulating component 40 can buffer the force exerted on the movable spring 31. At the same time, the interlocking portion 47 can buffer the transfer of this force to the armature 23. Consequently, the insulating component 40 as a whole provides a buffering effect between the movable spring 31 and the armature 23, ensuring a stable connection between the movable spring 31 and the armature 23 during long-term operation.

[0065] See again Figure 1 and Figure 2 As shown, the clap-type electromagnetic relay also includes a coil lead-out piece 29 electrically connected to the coil 21. The static spring 33 includes a static spring lead-out piece 33b. Both the coil lead-out piece 29 and the static spring lead-out piece 33b extend from the base 10, serving as functional pins of the clap-type electromagnetic relay, enabling connection between the clap-type electromagnetic relay and peripheral devices. To accommodate the extension of the functional pins of the clap-type electromagnetic relay, the base 10 is provided with sockets, the number of which can be configured to match the number of functional pins.

[0066] Combine Figure 1 and Figure 3As shown, the coil 21 and the coil lead-out piece 29 can be connected by winding and soldering. For example, the coil lead-out piece 29 has a connection portion 29a, and the coil 21 leads to a terminal 21b, which is connected to the connection portion 29a, thereby achieving the connection between the coil 21 and the coil lead-out piece 29. The end of the coil lead-out piece 29 where the connection portion 29a is provided can be embedded in the coil support 21a, and the connection portion 29a is exposed from the inner side of the coil support 21a to connect to the terminal 21b of the coil 21. In this embodiment, the end of the coil lead-out piece 29 with the terminal 21b is buried in the coil bracket 21a. On the one hand, the coil lead-out piece 29 and the coil bracket 21a are fixed, so that the coil lead-out piece 29 and the coil 21 can be assembled to the base 10 as a whole together with the coil bracket 21a, thereby improving the assembly convenience, and the coil bracket 21a can enhance the stability of the coil lead-out piece 29; on the other hand, the covering of the coil lead-out piece 29 by the coil bracket 21a can increase the creepage distance between the coil lead-out piece 29 and peripheral components such as the armature 23 or the movable spring 31.

[0067] According to the difference between the functional pins connecting the strong current part and the weak current part, the sockets that meet the needs of the functional pins to pass through the base 10 are classified and respectively called "first socket 11" and "second socket 13". The first socket 11 is suitable for the passing through needs of one type of functional pins, and the second socket 13 is suitable for the passing through needs of another type of functional pins.

[0068] The base 10 is provided with a first socket 11 and a second socket 13. It is understood that after the yoke 25 and the movable spring 31 are installed on the base 10 along with the armature 23, the first socket 11 is located below the position where the armature 23 and the yoke 25 mate, and the second socket 13 is located near the connection point between the yoke 25 and the base 10. For a structure in which the movable spring 31 contacts the static spring 33 by snapping, the snap-fit ​​electromagnetic relay meets the requirements of the corresponding functional design in a miniaturized structural design. The components fit tightly together without wasting space. Since the second socket 13 is located near the connection point between the yoke 25 and the base 10, the shortest distance from the second socket 13 to the yoke 25 is shorter than the shortest distance from the first socket 11 to the yoke 25.

[0069] In order to facilitate the understanding of the following technical solution of the clap-type electromagnetic relay of the present application, a clap-type electromagnetic relay in the conventional technology is described here as a comparative example.

[0070] In the conventional technology, the coil lead-out piece 29 connected to the coil 21 is provided in the second socket 13, and the static spring lead-out piece 33b is provided in the first socket 11. The shortest distance from the second socket 13 to the yoke 25 is smaller than the shortest distance from the first socket 11 to the yoke 25. Therefore, under this structural design of the conventional technology, the distance from the coil lead-out piece 29 to the yoke 25 is short, and therefore, the electrical clearance between the coil lead-out piece 29 and the yoke 25 is small. In order to meet the creepage requirements, it is necessary to increase the distance from the coil lead-out piece 29 to the connection position between the yoke 25 and the base 10 or to provide an insulating structure. The inventors have found that this approach of increasing the distance from the coil lead-out piece 29 to the connection position between the yoke 25 and the base 10 or providing an insulating structure will result in a lack of compactness between the components, which is not conducive to the miniaturization of the snap-on electromagnetic relay.

[0071] In this regard, in the snap-on electromagnetic relay of the present application, the static spring lead-out piece 33b extends out of the base 10 through the second socket 13, and the coil lead-out piece 29 extends out of the base 10 through the first socket 11. Since the shortest distance from the second socket 13 to the yoke 25 is shorter than the shortest distance from the first socket 11 to the yoke 25, that is, the shortest distance from the first socket 11 to the yoke 25 is longer than the shortest distance from the second socket 13 to the yoke 25, compared to the coil lead-out piece 29 extending out of the base 10 from the second socket 13, in the embodiment of the present application, the coil lead-out piece 29 extends out of the base 10 from the first socket 11, thereby increasing the distance from the coil lead-out piece 29 to the yoke 25, thereby increasing the creepage distance and / or electrical clearance.

[0072] It should be noted that, due to this structural setting, without changing the setting position of the first hole 11 and the second hole 13 on the base 10 and the structural setting of the yoke 25, the armature 23 and the movable spring 31, it is only necessary to adjust the setting position of the coil lead-out piece 29 so that the coil lead-out piece 29 is passed through the first hole 11, so as to achieve the purpose of increasing the creepage distance and / or electrical clearance between the movable spring 31 and the coil lead-out piece 29. Therefore, the structural setting of the present application can take into account the miniaturization of the clap-type electromagnetic relay while increasing the creepage distance and / or electrical clearance, which is conducive to expanding the application of the clap-type electromagnetic relay in higher voltage fields.

[0073] Combine Figure 8As shown, in some embodiments, the static spring 33 further includes a connecting portion 33c connected between the static contact 33a and the static spring lead-out piece 33b. In other words, the static contact 33a is located at the end of the connecting portion 33c away from the static spring lead-out piece 33b. The connecting portion 33c is horizontally bent relative to the vertical static spring lead-out piece 33b to abut against the base 10 and extend toward the side where the dynamic spring 31 is located. Therefore, when the static spring lead-out piece 33b extends out of the base 10 from the second insertion hole 13, the connecting portion 33c can be extended toward the side where the dynamic spring 31 is located, so that the static contact 33a is aligned with the dynamic spring 31, ensuring that the dynamic spring 31 can contact or disconnect the static contact 33a when the dynamic spring 31 is engaged or disengaged.

[0074] It is understandable that the movable spring 31 is provided with a movable contact 31a opposite to the static contact 33a. When the armature 23 drives the movable spring 31 to snap, the movable contact 31a contacts or disconnects with the static contact 33a.

[0075] In some embodiments, a bridge structure is adopted in the snap-on electromagnetic relay, that is, the dynamic spring 31 realizes the series connection between the two static springs 33. Figure 2 and Figure 8 As shown, the movable spring 31 includes two movable contacts 31a. Two stationary springs 33 are mounted on the base 10. Each stationary spring 33 leads to a stationary contact 33a, and the stationary contacts 33a of the two stationary springs 33 correspond to the two movable contacts 31a. Thus, when the movable spring 31, driven by the armature 23, engages the two stationary springs 33, the two stationary contacts 33a of the movable spring 31 come into contact with the stationary contacts 33a of the two stationary springs 33, respectively. Thus, the movable spring 31 connects the two stationary springs 33 in series. This bridge structure directly divides the load voltage, reducing the voltage across each set of movable contacts 31a and stationary contacts 33a. Consequently, the contact gap in the contact portion is the sum of the contact gaps between the two sets of movable contacts 31a and stationary contacts 33a. This is different from the related art in which a parallel structure is formed by one dynamic spring 31 corresponding to one static spring 33. Based on the fact that the voltage between each group of contacts does not change (the voltage borne by each group is equal to the load voltage), the clap-type electromagnetic relay of this embodiment increases the contact gap, thereby improving the arc-breaking ability, so as to improve its performance in high-voltage applications.

[0076] Combine Figure 1 、 Figure 2 and Figure 8 As shown, the number of static springs 33 and coil lead-out pieces 29 are both 2, the base 10 is provided with 2 first holes 11 and 2 second holes 13, the 2 coil lead-out pieces 29 are respectively correspondingly inserted into the 2 first holes 11, the 2 static springs 33 are arranged side by side in a direction perpendicular to the flapping direction of the armature 23, and the static spring lead-out pieces 33b of the 2 static springs 33 are respectively correspondingly inserted into the 2 second holes 13.

[0077] Combine Figure 9 and Figure 10 As shown, in some embodiments, the snap-on electromagnetic relay further includes an insulating cover 50 , which is used for electrical isolation between the two static springs 33 and between the static spring 33 and the coil lead-out piece 29 .

[0078] Combine Figures 11 to 13 As shown, the insulating cover 50 covers the connecting portion 33c, thereby isolating the static spring 33 from the coil 21 located above the insulating cover 50. The insulating cover 50 is formed with a plug-in portion 51 and a surrounding wall portion 53. The surrounding wall portion 53 is sandwiched between the coil lead-out piece 29 and the static contact 33a. The surrounding wall portion 53 is used to achieve electrical isolation between the coil lead-out piece 29 and the static contact 33a, thereby increasing the creepage distance and electrical clearance between the coil lead-out piece 29 and the static contact 33a.

[0079] Combine Figures 14 to 16 As shown, the coil lead-out piece 29 is inserted into the plug-in portion 51. It can be understood that when the end of the coil lead-out piece 29 is embedded in the coil support 21a, the structural portion of the coil support 21a that covers the end of the coil lead-out piece 29 is inserted into the plug-in portion 51 together with the coil lead-out piece 29. The plug-in portion 51 is matched with the first jack 11.

[0080] A glue dispensing groove (hereinafter referred to as "first glue dispensing groove 15") surrounding the coil lead-out piece 29 is formed on the side of the base 10 facing away from the insulating cover 50. Figure 17 As shown, the first glue dispensing groove 15 is provided with a glue injection part 151, which is sealed around the coil lead-out piece 29 and fills the gap between the coil lead-out piece 29 and the side wall of the first plug hole 11. The glue injection part 151 is in sealed contact with the plug-in portion 51. In this embodiment, by dispensing glue on the first glue dispensing groove 15, the glue is solidified to form the glue injection part 151, so that the glue injection part 151 can not only increase the connection stability between the insulating cover 50 and the base 10, but also, by sealing the gap between the coil lead-out piece 29 and the side wall of the first plug hole 11, and by sealingly contacting the plug-in portion 51, the portion of the coil lead-out piece 29 exposed from the plug-in portion 51 is completely isolated from the portion of the static spring 33 located inside the base 10. Therefore, this structural arrangement increases the creepage distance between the coil lead-out piece 29 and the static spring 33.

[0081] Combine Figure 16 and Figure 17 As shown, another glue dispensing groove (hereinafter referred to as "second glue dispensing groove 17") surrounding the static spring lead-out piece 33b is formed on the side of the base 10 facing away from the insulating cover 50. In this way, glue can be filled in the second glue dispensing groove 17. After the glue is cured, the stability of the static spring lead-out piece 33b at the second jack 13 can be increased, so that the static spring lead-out piece 33b is not easily separated from the base 10.

[0082] Combine Figure 18 As shown, the snap-on electromagnetic relay further includes a housing 60, which is mounted on the base 10. The housing 60 provides dustproof and waterproof protection for the magnetic circuit portion 20 and the contact portion 30 located on the base 10. Furthermore, a portion of the sidewall of the housing 60 extends from the edge of the base 10, and a notch is formed at the corresponding edge of the base 10, so that the portion of the housing 60 extending from the edge of the base 10 encloses the notch to form another glue dispensing groove (hereinafter referred to as the "third glue dispensing groove 19"). In this way, the housing 60 can be connected to the base 10 by filling the third glue dispensing groove 19 with glue.

[0083] In some embodiments, the housing 60 and the base 10 may be connected by snap-fit ​​connection or screws. The connection method between the housing 60 and the base 10 is not limited here.

[0084] The electrical isolation structure of the insulating cover 50 for the strong current part and the weak current part is not limited to the above-mentioned structure.

[0085] Recombination Figure 12 and Figure 13 As shown, in some embodiments, at least one of the base 10 and the insulating cover 50 is provided with a retaining wall 101. The retaining wall 101 is located between the static contacts 33a of the two static springs 33. Thus, the retaining wall 101 provides high-voltage isolation between the static contacts 33a of the two static springs 33. It is understood that the retaining wall 101 can also provide high-voltage isolation between the sheet-shaped carriers of the two static springs 33 that house the static contacts 33a. For example, in addition to the static contacts 33a of the static springs 33 being located outside the insulating cover 50, the sheet-shaped carrier of the static springs 33a that houses the static contacts 33a is also located outside the insulating cover 50. Because the retaining wall 101 is located between the static contacts 33a of the two static springs 33, it separates the sheet-shaped carriers that house the two static contacts 33a, thereby providing isolation between the sheet-shaped carriers.

[0086] In an embodiment where the insulating cover 50 is provided with a retaining wall 101 , the retaining wall 101 may be integrally formed with the insulating cover 50 , so that when the insulating cover 50 is mated with the base 10 , the retaining wall 101 is located between the static contacts 33 a of the two static springs 33 .

[0087] One of the insulating cover 50 and the base 10 is provided with a partition 55, and the other one is provided with a partition groove 103. The partition 55 cooperates with the partition groove 103 and is located between the connecting parts 33c of the two static springs 33, so that high-voltage isolation between the connecting parts 33c of the two static springs 33 is achieved by utilizing the cooperation between the partition 55 and the partition groove 103.

[0088] Combine Figure 11 and Figure 13As shown, in some embodiments, the base 10 is also provided with a fixing portion 105 having a slot 105a. The end of the yoke 25 away from the armature 23 is provided with an insert 25a. The insert 25a is inserted into the slot 105a, thereby ensuring a stable connection between the yoke 25 and the base 10. At the same time, by utilizing this plug-in fit between the fixing portion 105 and the insert 25a, the fixing portion 105 can cover the insert 25a, thereby further increasing the creepage distance between the yoke 25 and the static spring lead 33b of the static spring 33.

[0089] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above embodiments merely illustrate several implementation methods of the present application, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the inventive concept of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A snap-on electromagnetic relay, characterized in that: The invention comprises a base, a magnetic circuit part and a contact part; the magnetic circuit part is mounted on the base, and the contact part comprises a movable spring and a static spring; the magnetic circuit part comprises a coil, an armature and a yoke, the armature is connected to the yoke and is used to drive the movable spring to make contact with or break contact with the static spring in a snapping manner; the snap-type electromagnetic relay comprises an insulating component, the movable spring and the armature are integrally injection-molded through the insulating component, one end of the movable spring is buried in the insulating component, and the other end extends from the insulating component toward the side where the base is located; the insulating component comprises a main body and an extension part formed in one piece, the main body is connected to the armature, and the extension part extends from the main body toward the side where the base is located, and in the snapping direction of the movable spring, the extension part is located between the movable spring and the armature, and the extension part is spaced apart relative to at least one of the movable spring and the armature.

2. The snap-on electromagnetic relay according to claim 1, wherein: At least a portion of the extension portion is covered on a side of the armature facing the movable spring. One end of the movable spring is embedded in the main body, and a portion of the movable spring exposed from the main body is spaced apart from the extension portion.

3. The snap-on electromagnetic relay according to claim 2, wherein: The insulating component includes a covering portion covering the bottom end of the armature, and the covering portion is protruded on a side of the extending portion facing away from the movable spring.

4. The snap-on electromagnetic relay according to claim 2, wherein: The bottom end of the armature is formed with an inclined surface, and in a direction approaching the base, the gap between the portion of the extension portion covering the inclined surface and the movable spring gradually increases.

5. The snap-on electromagnetic relay according to claim 1, wherein: At least a portion of the extension portion covers a side of the movable spring facing the armature, the extension portion is spaced relative to the armature, and a bottom end of the extension portion extends beyond a bottom end of the armature; Alternatively, part of the structure of the main body protrudes from the side of the extension portion facing away from the armature to form a protrusion, one end of the movable spring is embedded in the protrusion, and the movable spring and the armature are both spaced apart from the extension portion.

6. The snap-on electromagnetic relay according to claim 1, wherein: A first through-hole is provided in the middle of the armature, and the insulating component includes an embedding portion connected to the main body, and the embedding portion cooperates with the first through-hole; a second through-hole is provided at the end of the movable spring, and part of the structure of the insulating component is embedded in the second through-hole.

7. The snap-on electromagnetic relay according to claim 6, characterized in that: In the snapping direction of the movable spring, a portion of the movable spring embedded in the insulating member and the fitting portion overlap with each other.

8. The snap-on electromagnetic relay according to any one of claims 1 to 7, characterized in that: The insulating component is formed with a first creepage path and a second creepage path. The first creepage path extends from a side of the movable spring facing away from the armature along a portion of the surface of the insulating component to a side of the armature facing the movable spring. The second creepage path extends from a side of the movable spring facing the armature along a portion of the surface of the insulating component to a side of the armature facing away from the movable spring. The lengths of the first creepage path and the second creepage path are both greater than or equal to 10 mm. And / or, the electrical gap between the movable spring and the armature is greater than or equal to 5.5 mm.

9. The snap-on electromagnetic relay according to claim 1, wherein: The snap-on electromagnetic relay also includes a coil lead-out piece electrically connected to the coil, the static spring includes a static spring lead-out piece, the base is provided with a first socket and a second socket, the coil lead-out piece and the static spring lead-out piece extend out of the base through the first socket and the second socket respectively, wherein the shortest distance from the first socket to the yoke is greater than the shortest distance from the second socket to the yoke.

10. The snap-on electromagnetic relay according to claim 9, characterized in that: The static spring also includes a connecting portion and a static contact. The connecting portion is horizontally bent relative to the vertically arranged static spring lead-out piece so as to be in contact with the base and extend toward the side where the dynamic spring is located. The dynamic spring is provided with a dynamic contact opposite to the static contact. The static contact is located at an end of the connecting portion away from the static spring lead-out piece. When the armature drives the dynamic spring to snap, the dynamic contact contacts or disconnects with the static contact.

11. The snap-on electromagnetic relay according to claim 10, characterized in that: The number of the static springs and the number of the coil lead-out pieces are both 2, the base is provided with 2 first jacks and 2 second jacks, the 2 coil lead-out pieces are respectively correspondingly inserted into the 2 first jacks, the 2 static springs are arranged side by side in a direction perpendicular to the flapping direction of the armature, and the static spring lead-out pieces of the 2 static springs are respectively correspondingly inserted into the 2 second jacks; the flapping electromagnetic relay also includes an insulating cover, which is used for electrical isolation between the 2 static springs and between the static springs and the coil lead-out pieces.

12. The snap-on electromagnetic relay according to claim 11, characterized in that: The insulating cover covers the connecting portion, and is formed with an inserting portion and a surrounding wall portion. The coil lead-out piece is inserted into the inserting portion. The surrounding wall portion is clamped between the coil lead-out piece and the static contact. The inserting portion cooperates with the first jack.

13. The snap-on electromagnetic relay according to claim 12, wherein: A glue dispensing groove surrounding the coil lead-out piece is formed on the side of the base facing away from the insulating cover. The glue dispensing groove is provided with a glue injection part, and the glue injection part is sealed around the coil lead-out piece. The glue injection part fills the gap between the coil lead-out piece and the side wall of the first jack, and the glue injection part is sealed and abutted against the plug-in part.

14. The snap-on electromagnetic relay according to any one of claims 11 to 13, characterized in that: At least one of the base and the insulating cover is provided with a retaining wall, and the retaining wall is located between the static contacts of the two static springs; And / or, one of the insulating cover and the base is provided with a partition, and the other one is provided with a partition groove, and the partition plate cooperates with the partition groove and is located between the connecting parts of the two static springs.

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