Push rod type subminiature relay

Abstract

The utility model relates to a push rod type subminiature relay, which comprises a magnetic circuit part, a push card and a contact part which are assembled on a base, the contact part is provided with static spring assemblies and movable spring assemblies which are arranged at intervals and can be attracted; the static spring assembly and the moving spring assembly of the contact part are provided with insulating coatings on the moving reed and / or the static reed at the shortest creepage distance path between the top side of the base. According to the push rod type relay, the insulating coating is arranged at the weak part of the contact part where the shortest creepage distance path possibly occurs, so that the creepage distance between the movable spring and the static spring can be effectively increased on the premise of not influencing the normal work of the push rod type relay, the short circuit risk is reduced in service, the service life of the product is prolonged, and the safety of the product is improved.

Description

Technical Field

[0001] The utility model relates to a relay, in particular to a push rod type, ultra-small relay. Background Art

[0002] The push rod relay is mainly composed of a magnetic circuit part assembled on the base, a push card and a contact part. Among them, the magnetic circuit part is mainly composed of a coil frame, a coil assembled on the coil frame, an iron core assembled in the coil frame, a yoke assembled beside the coil, and an armature of an approximately L-shaped structure assembled at the edge of the yoke; the contact part is mainly composed of a moving spring assembly and a static spring assembly. The static spring assembly is usually located on the side away from the magnetic circuit part compared to the moving spring assembly, and the moving contact of the moving spring assembly and the static contact of the static spring assembly are usually kept in a normally open state; the push card is connected between the armature of the magnetic circuit part and the moving spring assembly of the contact part. The working principle of the push rod relay of the above structure is:

[0003] When current is applied to both ends of the coil lead pins in the magnetic circuit part, the exciting current of the coil will generate magnetic flux, which will form a magnetic circuit through the iron core, armature, yoke and working air gap, and generate electromagnetic attraction in the working air gap;

[0004] When the excitation current rises to the set value, the electromagnetic attraction generated by the magnetic circuit part will overcome the reaction force of the movable spring assembly of the contact part, causing the armature to flip at the yoke and attract the iron core, so that the armature drives the push card to push the movable spring assembly to compress and deform, so that the movable contact of the movable spring assembly and the normally open static contact of the static spring assembly are closed;

[0005] When the excitation current decreases to the set value, the reaction force of the movable spring assembly in the contact part is greater than the electromagnetic attraction of the magnetic circuit part, and the compressed and deformed movable spring assembly is reset. At this time, the movable spring assembly is disconnected from the static spring assembly and drives the push card to push the armature of the magnetic circuit part, so that the armature of the magnetic circuit part is disconnected from the iron core and flipped to reset.

[0006] According to the technical requirements of the user side, it is necessary to make the design structure of the above-mentioned push rod type relay compact and form it with a smaller structural volume to form an ultra-small push rod type relay. Based on this, the matching space between the dynamic spring assembly and the static spring assembly of the contact part is reduced, so that there is a weak point of the shortest creepage distance path between the static spring assembly and the dynamic spring assembly on the top side of the base (the side of the base facing the contact matching area), usually between the edge of the dynamic spring piece and the edge of the static spring piece. The aforementioned possible weak point of the shortest creepage distance path is prone to short circuit risk during service, which is especially obvious under the influence of contact splashes.

[0007] In the operation of various types of relays, including the above-mentioned push rod relays, the dynamic spring assembly and the static spring assembly bear the important task of breaking and connecting the circuit. When the dynamic contact and the static contact are infinitely close to being connected, a breakdown phenomenon will occur, thereby forming an arc. Due to the high temperature of the arc, a molten metal pool will form on the surface of the contact. When the contacts are in full contact and collision, these metal pools will produce metal splashes - commonly known as contact spatters. Since contact spatters are conductive metal particles, when the contact spatters gather to a certain amount during long-term service, it is easy to form a conductive path between the dynamic spring and the static spring.

[0008] As for the above-mentioned contact splash phenomenon in the above-mentioned ultra-small push rod relay structure, due to the narrow matching space between the dynamic spring assembly and the static spring assembly of the above-mentioned ultra-small push rod relay, the space available for accommodating contact splash is extremely limited. In this way, the contact splash will fall freely to the ground after radial splashing, and thus gather between the dynamic spring piece and the static spring piece on the top surface of the base. Since the edge of the dynamic spring piece and the edge of the static spring piece are the areas with weak insulation performance, the contact splash that falls freely on the edges of both sides of the spring piece in the width direction (transverse to the pushing direction of the push card) is easy to form a collection and conductive path, which greatly reduces the insulation performance between the dynamic and static springs of the ultra-small push rod relay, and there is a high risk of short circuit in service.

[0009] Currently, there is no effective technical solution to the above technical problems. Utility Model Content

[0010] The technical purpose of the utility model is to provide a push rod type subminiature relay which can effectively increase the creepage distance between the dynamic and static springs in view of the particularity of the above push rod type subminiature relay and the shortcomings of the prior art.

[0011] The technical purpose of the utility model is achieved through the following technical solution: a push rod type ultra-small relay, comprising a magnetic circuit part, a push card and a contact part assembled on a base;

[0012] The contact portion comprises a static spring assembly and a dynamic spring assembly which are arranged at intervals and can be attracted;

[0013] The static spring assembly and the dynamic spring assembly of the contact portion are provided with an insulating coating on the dynamic spring piece and / or the static spring piece at the shortest creepage distance path between the top side of the base.

[0014] The above technical measures are aimed at the particularity of the above-mentioned push rod type ultra-small relay. A weak point in the shortest creepage distance path may appear between the moving and static springs of the contact part. Through the molding of the insulating coating, the creepage distance between the moving and static springs can be effectively increased without affecting the normal operation of the push rod type relay, thereby reducing the short circuit risk during service and improving the product service life and safety.

[0015] In addition, the insulating coating of the above technical measures is light and thin. While meeting the technical requirements of insulation performance, it will not hinder the working performance between the static reed and the dynamic reed, nor will it increase the molding structure of the entire relay, that is, it meets the insulation performance requirements in the ultra-miniaturized structural design.

[0016] As one of the preferred technical solutions, the static spring piece has a base plug-in portion and a contact connection portion, and a transition shoulder portion with a reduced width is provided between the base plug-in portion and the contact connection portion, and the width of the contact connection portion is smaller than the width of the base plug-in portion;

[0017] The insulating coating is formed at the transition shoulder portion of the static spring.

[0018] Furthermore, the width of the contact connection portion of the static spring piece is smaller than the width of the insertion portion of the movable spring piece of the movable spring assembly on the base.

[0019] While meeting the technical requirements, the above technical measures miniaturize the width of the contact connection part of the static spring sheet used to connect the static contact, thereby forming a large difference with the width of the insertion part of the dynamic spring sheet, so as to cooperate with the insulating coating on the static spring sheet to reliably increase the creepage distance between the dynamic and static springs.

[0020] Still further, the relay also includes a housing serving as a housing base;

[0021] In the inner cavity of the housing, corresponding to the contact matching area between the dynamic spring assembly and the static spring assembly, two isolation retaining walls are formed in a spaced arrangement structure and convexly;

[0022] When the shell surrounds the base, the two isolation retaining walls are arranged in a non-contact manner on both sides of the contact connection part of the static spring piece in the width direction; and the protruding width of the isolation retaining wall in the thickness direction of the static spring piece is greater than the thickness of the contact connection part.

[0023] Furthermore, the transition shoulder portion on the static spring piece is located at the lower part of the static contact connected to the contact connecting portion;

[0024] Correspondingly, the bottom edge of the isolation retaining wall 1 in the housing is close to or abuts against the corresponding side transition shoulder of the static spring sheet, and is located at the lower part of the static contact connected to the contact connecting part.

[0025] The above technical measures, through the isolation retaining wall design on the casing, form a shielding and surrounding for the static contact of the static spring assembly and the contact connecting part of the static spring piece without affecting the normal operation of the push rod type relay. On the one hand, it will further increase the creepage distance between the edge of the contact connecting part and the corresponding edge of the dynamic spring piece; on the other hand, because the isolation retaining wall is located beside the contact matching area between the dynamic and static springs, it can form an attachment blocking structure for the radially splashing contact splashes to reduce the free falling and gathering of the contact splashes between the dynamic and static springs, thereby effectively delaying the contact splashes from forming a conductive path between the dynamic and static springs, which is conducive to effectively improving the voltage resistance performance of the push rod type relay.

[0026] Furthermore, the isolation retaining wall 1 in the housing is arranged at a position at the contact matching area between the dynamic spring assembly and the static spring assembly, at least surrounds the static contact contact side of the static spring assembly at the corresponding side, and matches with the dynamic spring piece of the dynamic spring assembly with a set stroke in a non-contact manner. Under the premise of not affecting the normal operation of the push rod relay, this technical measure uses the relatively fixedly arranged static contacts as the positioning reference, so that the isolation retaining wall surrounds the contact matching area of ​​the contact part as much as possible. In addition, the isolation retaining wall of the technical measure can also reliably constrain and limit the overtravel of the dynamic spring assembly, that is, within the set travel range of the dynamic spring assembly, the moving contact of the dynamic spring assembly is contacted and attracted with the static contact of the static spring assembly within the range surrounded by the isolation retaining wall, and the dynamic spring sheet of the dynamic spring assembly and the isolation retaining wall maintain non-contact cooperation; when the dynamic spring assembly overtravels, the isolation retaining wall will not hinder the moving contact of the dynamic spring assembly from contacting and attracting with the static contact of the static spring assembly, but will produce a blocking limit on the overtravel dynamic spring assembly due to the contact and collision of the overtravel dynamic spring assembly on the isolation retaining wall, which is beneficial to reduce the risk of secondary connection between the dynamic spring assembly and the static spring assembly that is not technically required.

[0027] As one of the preferred technical solutions, the movable spring has a base plug-in portion and a contact connection portion, and a transition shoulder portion with a reduced width is provided between the base plug-in portion and the contact connection portion, and the width of the contact connection portion is smaller than the width of the base plug-in portion;

[0028] The insulating coating is formed at the transition shoulder portion of the movable spring.

[0029] The above technical measures may result in a weak point in the shortest creepage distance path between the moving and static springs in the contact part. By forming an insulating coating on the moving spring piece, the creepage distance between the moving and static springs can be effectively increased without affecting the normal operation of the push rod relay. This is especially prominent when the static spring piece is also specifically formed with an insulating coating, which reliably reduces the risk of short circuit during service and improves the service life and safety of the product.

[0030] The beneficial technical effect of the utility model is: the above technical measures are aimed at the particularity of the above push rod type ultra-small relay. A weak point of the shortest creepage distance path may appear between the dynamic and static springs of the contact part. By forming the insulating coating and setting an isolation retaining wall of the shielding and surrounding structure on both sides of the contact connection part of the static spring piece through the shell, the creepage distance between the dynamic and static springs can be effectively increased without affecting the normal operation of the push rod type relay, thereby reducing the risk of short circuit during service and improving the service life and safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the utility model.

[0032] Figure 2 for Figure 1 Schematic diagram of the static spring assembly structure.

[0033] Figure 3 This is another structural schematic diagram of the utility model.

[0034] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the relay shown at the top.

[0035] Figure 5 for Figure 3 and Figure 4 Schematic diagram of the shell structure.

[0036] The meanings of the codes in the figure are: 1—base; 2—static spring assembly; 21—static spring sheet; 211—base plug-in portion; 212—contact connection portion; 213—transition shoulder portion; 22—static contact; 3—movable spring assembly; 4—housing; 41—isolation retaining wall one; 42—isolation retaining wall two. DETAILED DESCRIPTION

[0037] The utility model relates to a relay, specifically a push rod type, ultra-small relay. The main technical solution of the utility model is specifically described below in combination with multiple embodiments. Figure 1 and Figure 2 The technical solution of the utility model is clearly and in detail explained; Example 2 is combined with the accompanying drawings of the specification - that is, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The technical solution of the utility model is clearly and in detail explained; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1 or embodiment 2.

[0038] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention in the prior art. In addition, the expressions "approximately" and "substantially" in the following text regarding quantity or matching relationship mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantity or matching relationship.

[0039] Example 1

[0040] See also Figure 1 and Figure 2 As shown, the utility model comprises a magnetic circuit part, a push card and a contact part which are assembled on a base 1.

[0041] Specifically, the magnetic circuit part on the base 1 is mainly composed of a coil frame, a coil mounted on the coil frame, an iron core mounted in the coil frame, a yoke mounted on the side of the coil, and an armature with an approximately L-shaped structure mounted at the edge of the yoke. The coil has a lead-out pin extending from the bottom of the base 1.

[0042] The contact part on the base 1 is mainly composed of a dynamic spring assembly 3 and a static spring assembly 2. The static spring assembly 2 is located on a side away from the magnetic circuit part compared to the dynamic spring assembly 3, and the dynamic contact of the dynamic spring assembly 3 and the static contact 22 of the static spring assembly 2 are kept in a normally open state. The dynamic contact of the dynamic spring assembly 3 and the static contact 22 of the static spring assembly 2 constitute a contact matching area of ​​the contact part.

[0043] The push card on the base 1 is connected between the armature of the magnetic circuit part and the movable spring assembly 3 of the contact part, and moves between the magnetic circuit part and the contact part according to the increase and decrease of the electromagnetic attraction and the elastic force of the movable spring piece.

[0044] In the above push rod type relay structure, due to the ultra-miniaturized design, in order to increase the creepage distance between the dynamic and static springs, that is, the creepage distance between the edge of the dynamic spring and the edge of the static spring, the static spring 21 of the static spring assembly 2 is specifically formed in the following structure:

[0045] The static spring piece 21 has a base plug-in portion 211 and a contact connection portion 212. The base plug-in portion 211 is at the bottom and is used for plugging and installing on the base 1 and forming a lead pin. The contact connection portion 212 is at the top and is used for connecting the static contact 22.

[0046] The base plug-in portion 211 and the contact connection portion 212 are formed with a transition structure with a decreasing width, that is, there is a transition shoulder portion 213 with a decreasing width between the base plug-in portion 211 and the contact connection portion 212, the static spring piece 21 area above the transition shoulder portion 213 is the contact connection portion 212, and the static spring piece 21 area below the transition shoulder portion 213 is the base plug-in portion 211, so that the width of the contact connection portion 212 is smaller than the width of the base plug-in portion 211, and the width refers to the direction of the spring piece transverse to the displacement direction of the above-mentioned push card;

[0047] In the molding structure of the aforementioned static spring piece 21, the transition shoulder portion 213 is located at the lower part of the static contact 22 connected to the contact connecting portion 212, that is, it is basically flush with or slightly lower than the bottom edge of the static contact 22 in the width direction.

[0048] The static spring piece 21 of the above structure is inserted and assembled in the insertion hole on the base 1 through the base insertion part 211. When the base insertion part 211 is inserted into the base 1, the transition shoulder part 213 is adjacent to the top side surface of the base 1 and slightly protrudes from the top side surface of the base 1. In addition, the contact connection part 212 of the static spring piece 21 of this structure has a width smaller than the insertion part width of the dynamic spring piece inserted in the base 1. The contact connection part 212 of the static spring piece 21 is within the coverage range of the dynamic spring piece in the width direction, and the edges on both sides in the width direction form a staggered fit.

[0049] At the transition shoulder 213 of the static spring piece 21, an insulating coating is formed with a full coverage structure, that is, the insulating coating fully covers the surface of the transition shoulder 213, that is, the insulating coating at the transition shoulder 213 of the static spring piece 21 serves as an insulating structure at the shortest creepage distance path between the moving spring piece and the static spring piece of the contact part on the top side of the base.

[0050] Example 2

[0051] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the utility model comprises a magnetic circuit part, a push card and a contact part assembled on a base 1 , and a shell 4 used for surrounding the base 1 .

[0052] Specifically, the magnetic circuit part on the base 1 is mainly composed of a coil frame, a coil mounted on the coil frame, an iron core mounted in the coil frame, a yoke mounted on the side of the coil, and an armature with an approximately L-shaped structure mounted at the edge of the yoke. The coil has a lead-out pin extending from the bottom of the base 1.

[0053] The contact part on the base 1 is mainly composed of a dynamic spring assembly 3 and a static spring assembly 2. The static spring assembly 2 is located on a side away from the magnetic circuit part compared to the dynamic spring assembly 3, and the dynamic contact of the dynamic spring assembly 3 and the static contact 22 of the static spring assembly 2 are kept in a normally open state. The dynamic contact of the dynamic spring assembly 3 and the static contact 22 of the static spring assembly 2 constitute a contact matching area of ​​the contact part.

[0054] The push card on the base 1 is connected between the armature of the magnetic circuit part and the movable spring assembly 3 of the contact part, and moves between the magnetic circuit part and the contact part according to the increase and decrease of the electromagnetic attraction and the elastic force of the movable spring piece.

[0055] In the above push rod type relay structure, due to the ultra-miniaturized design, in order to increase the creepage distance between the dynamic and static springs, that is, the creepage distance between the edge of the dynamic spring and the edge of the static spring, the static spring 21 of the static spring assembly 2 is specifically formed in the following structure:

[0056] The static spring piece 21 has a base plug-in portion 211 and a contact connection portion 212. The base plug-in portion 211 is at the bottom and is used for plugging and installing on the base 1 and forming a lead pin. The contact connection portion 212 is at the top and is used for connecting the static contact 22.

[0057] The base plug-in portion 211 and the contact connection portion 212 are formed with a transition structure with a decreasing width, that is, there is a transition shoulder portion 213 with a decreasing width between the base plug-in portion 211 and the contact connection portion 212, the static spring piece 21 area above the transition shoulder portion 213 is the contact connection portion 212, and the static spring piece 21 area below the transition shoulder portion 213 is the base plug-in portion 211, so that the width of the contact connection portion 212 is smaller than the width of the base plug-in portion 211, and the width refers to the direction of the spring piece transverse to the displacement direction of the above-mentioned push card;

[0058] In the molding structure of the aforementioned static spring piece 21, the transition shoulder portion 213 is located at the lower part of the static contact 22 connected to the contact connecting portion 212, that is, it is basically flush with or slightly lower than the bottom edge of the static contact 22 in the width direction.

[0059] The static spring piece 21 of the above structure is inserted and assembled in the insertion hole on the base 1 through the base insertion part 211. When the base insertion part 211 is inserted into the base 1, the transition shoulder part 213 is adjacent to the top side surface of the base 1 and slightly protrudes from the top side surface of the base 1. In addition, the contact connection part 212 of the static spring piece 21 of this structure has a width smaller than the insertion part width of the dynamic spring piece inserted in the base 1. The contact connection part 212 of the static spring piece 21 is within the coverage range of the dynamic spring piece in the width direction, and the edges on both sides in the width direction form a staggered fit.

[0060] At the transition shoulder 213 of the static spring piece 21, an insulating coating is formed with a full coverage structure, that is, the insulating coating fully covers the surface of the transition shoulder 213, that is, the insulating coating at the transition shoulder 213 of the static spring piece 21 serves as an insulating structure at the shortest creepage distance path between the moving spring piece and the static spring piece of the contact part on the top side of the base.

[0061] Based on the main structure of the push rod type relay, two isolation retaining walls 41 are provided in the inner cavity of the housing 4 that encloses the push rod relay, corresponding to the contact matching area between the dynamic spring assembly 3 and the static spring assembly 2, with a protruding structure. The two isolation retaining walls 41 are protrudingly formed based on the top wall of the housing 4 and the vertical wall adjacent to the static spring assembly 2. The two isolation retaining walls 41 form a spacing arrangement structure in the inner cavity of the housing 4, and the arrangement spacing is greater than the outer diameter of the static contact 22 on the static spring assembly 2. Of course, other structures can also be formed in the inner cavity of the aforementioned housing 4, such as an isolation retaining wall 42 located between the magnetic circuit part and the contact part and above the push card.

[0062] In the matching structure of the shell 4 and the base 1, the two isolation retaining walls 41 are as close as possible to the contact matching area between the dynamic spring assembly 3 and the static spring assembly 2 without affecting the normal contact work, that is, the arrangement spacing between the two isolation retaining walls 41 in the shell 4 is slightly larger than the width of the contact connecting portion 212 of the static spring sheet 21; in the top view direction, the molding positions of the two isolation retaining walls 41 are within the coverage range of the base plug-in portion 211 in the width direction.

[0063] When the shell 4 surrounds the base 1 with the magnetic circuit part, the push card, and the contact part, the two isolation retaining walls 41 in the inner cavity of the shell 4 are arranged in a non-contact manner across the corresponding two sides of the contact connection part 212, that is, a micro-gap fit is formed between the inner wall surface of each isolation retaining wall 41 and the corresponding edge of the contact connection part 212. In other words, the two isolation retaining walls 41 in the inner cavity of the shell 4 are arranged in a non-contact manner at the corresponding two sides of the contact matching area of ​​the contact part.

[0064] In order to prevent the isolation retaining wall 41 in the housing 4 from interfering with the position of the dynamically changing dynamic spring assembly 3 during operation, the isolation retaining wall 41 in the housing 4 should be arranged at the contact matching area to surround the static contact 22 of the static spring assembly 2 on the corresponding side and form a small outer edge from the contact side of the static contact 22. The depth of the outer edge should allow the dynamic contact of the dynamic spring assembly 3 in a normal stroke to contact and engage with the static contact 22, but not to form a contact match with the dynamic spring piece in the contact attracted state, that is, in the contact attracted state, the isolation retaining wall 41 is adjacent to the edge of the dynamic spring assembly 3 and cooperates with the dynamic spring piece with a micro gap, so as not to interfere with the working relationship between the dynamic spring assembly 3 and the static spring assembly 2 within the set stroke, but to form a path winding between the contact connecting portion 212 of the static spring piece 21 and the edge of the plug-in portion of the dynamic spring piece, so as to increase the creepage distance and effectively adhere to the contact splashes generated in the contact matching area.

[0065] Of course, in order to increase the barrier effect of the isolation retaining wall 41 on the contact splashes generated in the contact mating area and to increase the creepage distance, the bottom edge of the isolation retaining wall 41 in the housing 4 abuts (or is close to abutting) the corresponding side transition shoulder 213 of the static spring sheet 21, and is also located at the lower part of the static contact 22 connected to the contact connecting portion 212.

[0066] Example 3

[0067] The other contents of this embodiment are the same as those of Embodiment 1 or 2, except that:

[0068] The movable spring piece has a base plug-in portion and a contact connection portion, the base plug-in portion is at the bottom and is used for plugging and installing on the base, and the contact connection portion is at the top and is used for connecting the movable contact; the base plug-in portion and the contact connection portion are formed with a transition structure with a reduced width, that is, there is a transition shoulder portion with a reduced width between the base plug-in portion and the contact connection portion, the movable spring piece area above the transition shoulder portion is the contact connection portion, and the movable spring piece area below the transition shoulder portion is the base plug-in portion, so that the width of the contact connection portion is smaller than the width of the base plug-in portion, and the width refers to the direction of displacement of the spring piece transverse to the above-mentioned push card;

[0069] Eliminate the insulating coating at the transition shoulder of the static spring;

[0070] An insulating coating is formed at the transition shoulder portion of the movable spring.

[0071] In this way, the insulating coating at the transition shoulder of the moving spring piece serves as the insulating structure at the shortest creepage distance path between the moving spring piece and the static spring piece of the contact portion on the top side of the base.

[0072] Example 4

[0073] The other contents of this embodiment are the same as those of Embodiment 1 or 2, except that:

[0074] The movable spring piece has a base plug-in portion and a contact connection portion, the base plug-in portion is at the bottom and is used for plugging and installing on the base, and the contact connection portion is at the top and is used for connecting the movable contact; the base plug-in portion and the contact connection portion are formed with a transition structure with a reduced width, that is, there is a transition shoulder portion with a reduced width between the base plug-in portion and the contact connection portion, the movable spring piece area above the transition shoulder portion is the contact connection portion, and the movable spring piece area below the transition shoulder portion is the base plug-in portion, so that the width of the contact connection portion is smaller than the width of the base plug-in portion, and the width refers to the direction of displacement of the spring piece transverse to the above-mentioned push card;

[0075] An insulating coating is formed at the transition shoulder portion of the movable spring.

[0076] In this way, the insulating coating at the transition shoulder of the moving spring piece and the insulating coating at the transition shoulder of the static spring piece together serve as the insulating structure at the shortest creepage distance path between the moving spring piece and the static spring piece of the contact part on the top side of the base.

[0077] The above embodiments are only used to illustrate the present invention, but not to limit it.

[0078] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the above embodiments or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. A push rod type ultra-small relay, comprising a magnetic circuit part, a push card and a contact part assembled on a base (1); The contact portion comprises a static spring assembly (2) and a dynamic spring assembly (3) which are arranged at intervals and can be attracted; Features: An insulating coating is provided on the moving spring piece and / or the stationary spring piece (21) at the shortest creepage distance path between the static spring assembly (2) and the moving spring assembly (3) of the contact portion and the top side of the base (1).

2. The push rod type subminiature relay according to claim 1, characterized in that: The static spring piece (21) comprises a base plug-in portion (211) and a contact connection portion (212), and a transition shoulder portion (213) with a decreasing width is provided between the base plug-in portion (211) and the contact connection portion (212), and the width of the contact connection portion (212) is smaller than the width of the base plug-in portion (211); The insulating coating is formed on the transition shoulder portion (213) of the static spring sheet (21).

3. The push rod type subminiature relay according to claim 2, characterized in that: The width of the contact connection portion (212) of the static spring piece (21) is smaller than the width of the insertion portion of the moving spring piece of the moving spring assembly (3) on the base (1).

4. The push rod type subminiature relay according to claim 3, characterized in that: The relay also includes a housing (4) serving as a housing base (1); In the inner cavity of the housing (4), corresponding to the contact matching area between the dynamic spring assembly (3) and the static spring assembly (2), two isolation retaining walls (41) are formed in a spaced arrangement structure and in a convex shape; When the housing (4) surrounds the base (1), the two isolation retaining walls (41) are arranged in a non-contact manner on both sides of the contact connection portion (212) of the static spring sheet (21) in a width direction; and the protruding width of the isolation retaining wall (41) in the thickness direction of the static spring sheet (21) is greater than the thickness of the contact connection portion (212).

5. The push rod type subminiature relay according to claim 4, characterized in that: The transition shoulder portion (213) on the static reed sheet (21) is located at the lower portion of the static contact (22) connected to the contact connection portion (212); Correspondingly, the bottom edge of the isolation retaining wall 1 (41) in the housing (4) abuts against or contacts the corresponding side transition shoulder (213) of the static spring sheet (21) and is located at the lower part of the static contact (22) connected to the contact connecting portion (212).

6. The push rod type subminiature relay according to claim 4 or 5, characterized in that: The isolation retaining wall 1 (41) in the housing (4) is arranged at a contact matching area between the movable spring assembly (3) and the static spring assembly (2) to at least surround the contact side of the static contact (22) of the static spring assembly (2) on the corresponding side and to match with the movable spring sheet of the movable spring assembly (3) of the set stroke in a non-contact manner.

7. The push rod type subminiature relay according to claim 1, characterized in that: The movable spring piece has a base plug-in portion and a contact connection portion, and a transition shoulder portion with a reduced width is provided between the base plug-in portion and the contact connection portion, and the width of the contact connection portion is smaller than the width of the base plug-in portion; The insulating coating is formed at the transition shoulder portion of the movable spring.

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