JP2023546233A - Ultra-compact relay with high creepage distance - Google Patents

Abstract

The present disclosure discloses a microminiature relay with high creepage distance and includes a pedestal portion (2) and a movable contact spring and armature combination (3). The pedestal part (2) includes a coil (26), an iron core (21), a fixed contact spring, a coil terminal (22), and a coil (26), an iron core (21), a fixed contact spring, and a coil terminal (22) by injection molding. a first plastic body (23) which is integrated into a single piece. In the pedestal part (2), the fixed contact spring injection molded on the first plastic body (23) has a normally open fixed contact spring piece ( 24) and only a welding table (25) of a welding lug structure (311) for supporting at least the movable contact spring and armature combination (3) corresponding to the intermediate position of the coil axis, and there is no normally closed fixed contact spring. . The present disclosure can effectively improve the creepage distance between the coil (26) and the contact without increasing the volume of the relay, thereby improving the input and output of the relay in fields such as new energy and automotive applications. meet increasingly higher creepage distance requirements.

Description

Cross-reference to related applications This disclosure claims priority to the Chinese patent application with application number 202011609586.3 filed on December 30, 2020, and the entire content of the Chinese patent application is incorporated into the present application. .

TECHNICAL FIELD The present disclosure relates to the field of relay technology, and particularly to microminiature relays with high creepage distance.

Conventional ultra-compact relays generally have a cut fixed contact spring piece integrally connected to a coil, a pedestal, etc. using an injection molding method, and the extraction terminal of the fixed contact spring piece and the extraction terminal of the coil terminal are injection molded. The lead terminals of such a micro-relay are generally distributed along both sides of the coil axis. FIG. 1 is a schematic three-dimensional structure diagram (not including the housing) of a conventional micro-relay. FIG. 2 is a structural schematic diagram of a combination of a movable contact spring and an armature of a micro-miniature relay according to the prior art. FIG. 3 is a structural schematic diagram of a pedestal portion of a conventional micro-relay. As shown in FIGS. 1, 2, and 3, such a micro-relay of the prior art includes a plastic body 109 in which a coil, an iron core 101, a fixed contact spring, and a coil terminal 102 are integrally assembled by an injection molding method. A seat portion 100 is formed, where the fixed contact spring includes two normally open fixed contact spring pieces 103 , two normally closed fixed contact spring pieces 104 and two common end spring pieces 105 . The normally open fixed contact spring piece 103, the normally closed fixed contact spring piece 104, and the common end spring piece 105 have a normally open fixed contact spring pullout terminal 1031 and a normally closed fixed contact spring pullout terminal 1041 exposed outside the plastic body 109, respectively. , a common end lead-out terminal 1051 is provided. A normally open fixed contact 1032 and a normally closed fixed contact 1042 are further connected to the exposed upper ends of the plastic body of the normally open fixed contact spring piece 103 and the normally closed fixed contact spring piece 104, respectively. The combination 106 of the movable contact spring and armature of such a micro-miniature relay is made by forming two sets of movable contact spring pieces 107 and the armature 108 into an integral structure including a plastic part 110 by an injection molding method. Both ends of the movable contact spring piece 107 are a normally open side 1071 and a normally closed side 1072 exposed to the outside of the plastic part 110, respectively, and a welded lug structure 1073 exposed to the outside of the plastic part 110 is provided in the middle, so that the movable contact spring piece 107 is normally open. A normally open movable contact and a normally closed movable contact are attached to side 1071 and normally closed side 1072, respectively. When attaching the movable contact spring and armature combination 106 to the pedestal portion 100, the weld lug structure 1073 of the movable contact spring and armature combination 106 and the welding base of the common end spring piece 105 of the pedestal portion 100 are welded together. The movable contact spring and armature combination 106 exhibits a seesaw structure. In the pedestal portion 100, the pull-out terminal 1021 of the coil terminal 102 is located at one end of the plastic body 109, and the normally closed fixed contact spring pull-out terminal 1041, the common end pull-out terminal 1051, and the normally open fixed contact spring pull-out terminal 1031 are sequentially connected to the plastic body 109. The normally open fixed contact spring lead-out terminal 1031 is distributed from one end of the plastic body 109 to the other end of the plastic body 109 . As shown in FIG. 3, such a conventional ultra-compact relay has a small product volume and a compact overall structure, so that the coil terminal 102 and the fixed contact spring (normally closed fixed contact spring piece 104) are This has the disadvantage that the creepage distance M between the coil terminal 102 and the fixed contact (normally closed fixed contact 1042) are both short, and the input and output (i.e. Increasingly high safety requirements (ie high creepage distances) cannot be met (between the coil and the contacts).

The purpose of the present disclosure is to overcome the shortcomings of the prior art and provide an ultra-compact relay with a high creepage distance, and by improving the structure, the distance between the coil and the contact point is provided without increasing the volume of the relay. can effectively improve the creepage distance of the relay, thereby meeting the increasingly higher safety requirements for relay input and output in new energy, automotive and other fields.

The technical solutions used by the present disclosure to solve the technical problem are as follows: a microminiature relay with high creepage distance, including a pedestal part and a combination of a movable contact spring and an armature; The base part includes a coil, an iron core, a fixed contact spring, a coil terminal, and a first plastic body, and the first plastic body integrates the coil, iron core, fixed contact spring, and coil terminal into an integral member by injection molding, and the first plastic body includes a coil, an iron core, a fixed contact spring, a coil terminal, and a first plastic body. The plastic body completely covers the coil; the pole faces at both ends of the iron core respectively protrude from the first plastic body to the upper end of the first plastic body, and are located at both ends of the first plastic body, and the first plastic body of the coil terminal The exposed part is located at one end of the first plastic body; the movable contact spring and armature combination includes two sets of movable contact spring pieces, an armature and a second plastic body, and the second plastic body is molded by injection molding. Two sets of movable contact spring pieces and an armature are integrated into an integral member; a welding lug structure is provided at the intermediate position of the combination of the movable contact spring and the armature, and the combination of the movable contact spring and armature is fixed to the pedestal part by the welding lug structure. Both ends of the armature mounted at an intermediate position on the top end and exposed from the second plastic body correspond to and cooperate with pole faces at both ends of the iron core; fixed contact springs injection molded on the first plastic body are normally open. Only includes a fixed contact spring piece and a welding table, does not include a normally closed fixed contact spring piece, the normally open fixed contact spring piece is installed at the other end of the first plastic body, and the welding table is located at an intermediate position of the first plastic body. Correspondingly installed and used to support the welded lug structure of at least the movable contact spring and armature combination, the first contact between the coil terminal and the fixed contact spring is removed by removing the normally closed fixed contact spring piece. Improve the creepage distance on the outside of the plastic body.

The axis of the coil is placed horizontally, and the iron core is U-shaped.

One welding lug structure is provided on each side of the intermediate position of the movable contact spring and armature combination, and each of the two welding lug structures is integrally provided with a corresponding set of movable contact spring pieces and a second plastic body. The movable contact spring piece has an asymmetric structure with respect to the welded lug structure, and one side of the movable contact spring piece corresponding to the normally open fixed contact spring piece is exposed outside the second plastic body. A normally open side is provided, and a normally open movable contact is mounted on the normally open side of the movable contact spring piece; the other side of the movable contact spring piece corresponding to the normally open side is completely covered within the second plastic body.

The horizontal section of the first plastic body has a rectangular or nearly rectangular shape, and a portion of the coil terminal exposed from the first plastic body and a side wall corresponding to the long side of the rectangle of the first plastic body are separated from each other. A first groove is provided corresponding to the creepage path between the exposed welding table and the first groove is used to reduce the creepage distance between the portion of the coil terminal exposed from the first plastic body and the welding table. increase.

The horizontal cross section of the first plastic body has a rectangular or nearly rectangular shape; a side wall corresponding to the long side of the rectangle of the first plastic body further includes a first barrier at the top end adjacent to one end of the first plastic body. projecting upward and extending so that the creepage path from the portion of the coil terminal exposed from the first plastic body through the iron core to the normally open end contact corresponds to the rectangular short side of the first plastic body. Creep along.

A second groove is provided in the side wall corresponding to the rectangular short side of the first plastic body, corresponding to the creeping path between the portion of the coil terminal exposed from the first plastic body and one end of the iron core. The two grooves are used to increase the creepage distance from the portion of the coil terminal exposed from the first plastic body through the core to the normally open end contact.

A second barrier is further provided at the upper end of the first plastic body, corresponding to the creepage path between the other end of the iron core and the normally open end contact, and the second barrier is used to protect the first plastic body of the coil terminal. The creepage distance from the body exposed portion through the core to the normally open end contact is further increased.

The movable contact spring and armature combination further includes permanent magnets, the permanent magnets being distributed along the longitudinal direction of the armature and laminated with the armature, and the permanent magnets extending toward the other end of the first plastic body. offset towards.
In the movable contact spring piece, the welding table is further provided with a common end lead-out terminal facing downward and exposed from the first plastic body, and the common end lead-out terminal is offset toward the other end of the first plastic body.

In the two sets of movable contact spring pieces, the other side corresponding to the normally open side is further electrically connected by a connecting sheet, and the connecting sheet is completely covered with the second plastic body; The sheet is integrally connected with the two sets of movable contact spring pieces by an integral molding method, or the connecting sheet is a separate part, and both ends of the connecting sheet are respectively abutted or welded to the two sets of movable contact spring pieces. Connected.

The connecting sheet is close to the end position of the corresponding end of the second plastic body, thereby providing sufficient space for the permanent magnet.

Compared with the prior art, the beneficial effects of the present disclosure are as follows:

1. In the present disclosure, in the pedestal part, the fixed contact spring injection molded on the first plastic body only includes a normally open fixed contact spring piece and a welding table, does not include a normally closed fixed contact spring piece, and has a normally open fixed contact spring. a spring piece is installed at a position corresponding to the other end of the coil axis of the first plastic body, a welding table is installed at an intermediate position of the coil axis, and at least a welding lug structure of the combination of the movable contact spring and the armature is provided. Used for support. Such a structure of the present disclosure can improve the creepage distance between the coil terminal and the fixed contact spring by removing the normally closed fixed contact spring piece in the pedestal part, thereby not increasing the volume of the relay. The premise is to effectively improve the creepage distance between the coil and the contacts, thereby meeting the increasingly high safety requirements for relay input and output in new energy, automotive and other fields.

2. In the present disclosure, a first groove is provided in the first plastic body corresponding to this creeping path between the coil terminal of the input and output (i.e., between the coil and the contact) of the relay and the welding table. , thereby making it possible to further improve the creepage distance between the coil and the contact.

3. The present disclosure further provides for this creepage path in the first plastic body between the normally open end contacts through the iron core corresponding to the coil terminals of the input and output (i.e., between the coil and the contact) of the relay. A second groove and a second barrier are provided, and the first barrier is used to extend the creepage path from the side wall corresponding to the rectangular long side of the first plastic body to the side wall corresponding to the rectangular short side of the first plastic body. , thereby further increasing the creepage distance between the coil and the contact.

4. In the present disclosure, only a welding table for supporting the welding lug structure of the combination of the movable contact spring and the armature is provided at a position corresponding to the common end of the first plastic body, and no lead-out terminal is provided; In the movable contact spring, the other side corresponding to the normally open side is further integrally connected by a connecting sheet. Such a structure of the present disclosure electrically connects two sets of movable contact spring pieces by a connection sheet, realizing series connection of normally open end contacts, and the contact gap is twice that of the conventional relay. There is, can effectively improve the contact gap, withstand pressure to cut the contact and the cutting ability of the product, thus, without the need for external series connection, the withstand pressure of the contact gap and the distance to cut the contact gap can be fulfilled.

5. In the present disclosure, the permanent magnets are distributed along the longitudinal direction of the armature and are laminated with the armature, and the permanent magnets are offset toward the other end of the first plastic body. Such a structure of the present disclosure uses an unbalanced double magnetic circuit structure to provide a larger deflection force to the normally open end, making it difficult to drive the relay due to the lack of normally closed contact pressure of the seesaw type relay. Alternatively, the occurrence of phenomena such as driving difficulties can be avoided, and the relay can be operated reliably.

In the following, the present disclosure will be explained in more detail with reference to the drawings and examples; however, the microminiature relay with high creepage distance of the present disclosure is not limited to the examples.

FIG. 1 is a schematic three-dimensional structure diagram (not including the housing) of a conventional micro-relay. FIG. 2 is a structural schematic diagram of a combination of a movable contact spring and an armature of a micro-miniature relay of the prior art. FIG. 3 is a schematic diagram of the three-dimensional structure of a pedestal portion of a conventional ultra-small relay. FIG. 4 is a schematic three-dimensional structure diagram (excluding the housing) of Example 1 of the present disclosure. FIG. 5 is a left side view (not including the housing) of Example 1 of the present disclosure. FIG. 6 is a right side view (not including the housing) of Example 1 of the present disclosure. FIG. 7 is a structural cross-sectional view (including the housing) of Example 1 of the present disclosure. FIG. 8 is a schematic diagram of the three-dimensional structure of the pedestal portion of Example 1 of the present disclosure. FIG. 9 is a cross-sectional view of the pedestal portion of Example 1 of the present disclosure. FIG. 10 is a schematic three-dimensional structure diagram of a combination of a movable contact spring and an armature according to Example 1 of the present disclosure. FIG. 11 is a bottom view of a combination of a movable contact spring and an armature according to Example 1 of the present disclosure. FIG. 12 is a bottom view of the movable contact spring and armature combination (with the second plastic body removed) of Example 1 of the present disclosure. FIG. 13 is a schematic three-dimensional structure diagram of a combination of a movable contact spring and an armature (with the second plastic body removed) according to Example 1 of the present disclosure. FIG. 14 is a schematic diagram of a magnetic circuit structure according to Example 1 of the present disclosure. FIG. 15 is a structural cross-sectional view of Example 1 of the present disclosure (the housing is not included and the normally closed end of the magnetic circuit is closed). FIG. 16 is a structural cross-sectional view of Example 1 of the present disclosure (the housing is not included, and the normally open end of the magnetic circuit is closed). FIG. 17 is a schematic distribution diagram of coil terminals and fixed contact springs in Example 1 of the present disclosure. FIG. 18 is an applied schematic diagram of the engagement of the coil terminal, fixed contact spring, and movable contact spring piece according to the first embodiment of the present disclosure. FIG. 19 is a schematic three-dimensional structure diagram (excluding the housing) of Example 2 of the present disclosure. FIG. 20 is a schematic diagram of the three-dimensional structure of the pedestal portion of Example 2 of the present disclosure. FIG. 21 is a structural schematic diagram of a combination of a movable contact spring and an armature (with the second plastic body removed) according to Example 2 of the present disclosure.

Embodiment 1 As shown in FIGS. 4 to 18, the high creepage microminiature relay of the present disclosure includes a housing 1, a pedestal portion 2, and a movable contact spring and armature combination 3. The pedestal part 2 includes a coil 26, an iron core 21, a fixed contact spring, a coil terminal 22, and a first plastic body 23, and the first plastic body 23 is formed by injection molding into a coil 26, an iron core 21, a fixed contact spring, and a coil terminal 22. are integrated into an integral member, and the first plastic body 23 completely covers the coil 26, the coil 26 includes a bobbin and an enameled wire, in this embodiment, the axis of the coil 26 is installed horizontally, and the axis of the iron core 21 is The pole faces 211 at both ends protrude from inside the first plastic body 23 and extend to the upper end of the first plastic body 23, and are located at both ends of the first plastic body 23, and there are two coil terminals 22. , the two coil terminals 22 are each located at one end of the first plastic body 23, that is, the portion of the coil terminal 22 exposed from the first plastic body is located at one end of the first plastic body, and the part of the coil terminal 22 exposed from the first plastic body is located at one end of the first plastic body 23. The portion exposed from the body includes a coil extraction terminal 221, the coil extraction terminal 221 of the coil terminal 22 is located approximately at a corner position of one end of the first plastic body 23, and the first plastic body 23 includes a base. The movable contact spring and armature combination 3 includes two sets of movable contact spring pieces 31, one armature 32 and a second plastic body 33, and the second plastic body 33 is formed by injection molding into two sets of movable contact spring pieces 31. , the armature 32 is integrated into a single piece, where along the coil axis direction, the armature 32 is located in the middle, and the two sets of movable contact spring pieces 31 are located on either side of the armature 32, respectively. Welding lug structures 311 are respectively provided on both sides of the intermediate position of the movable contact spring and armature combination 3, and the welding lug structure 311 of the movable contact spring and armature combination 3 is attached to the intermediate position of the top end of the pedestal part 2; In addition, both ends of the armature 32 exposed from the second plastic body 33 in the movable contact spring and armature combination 3 correspond to and cooperate with the pole faces 211 at both ends of the iron core 21, respectively. In the pedestal portion 2, the fixed contact spring injection molded on the first plastic body 23 includes only the normally open fixed contact spring piece 24 and the welding table 25, does not include the normally closed fixed contact spring piece, and is a normally open fixed contact spring. The piece 24 is located at the other end of the first plastic body 23, and the welding table 25 corresponds to the central position of the first plastic body 23 and supports at least the welding lug structure 311 of the movable contact spring and armature combination 3. By removing the normally closed fixed contact spring piece, the creepage distance on the outside of the first plastic body between the coil terminal and the fixed contact spring is improved. In this embodiment, the core is U-shaped.

In this embodiment, the welding lug structure 311 is integrally provided with the movable contact spring piece 31 and exposed outside the second plastic body 33 . The movable contact spring piece 31 has an asymmetric structure with respect to the welded lug structure, and a normally open side 312 exposed outside the second plastic body is provided on one side of the movable contact spring piece 31 corresponding to the normally open fixed contact spring. A normally open movable contact 313 is attached to the normally open side 312 of the movable contact spring, and the other side of the movable contact spring piece 31 corresponding to the normally open side is completely covered within the second plastic body 33 .

The present disclosure provides a normally open seesaw type relay by removing the normally closed side of the normally closed fixed contact spring and the movable contact spring of the seesaw type relay.

In this embodiment, the horizontal cross section of the first plastic body 23 has a rectangular or nearly rectangular shape, and a side wall 231 corresponding to the long side of the rectangle in the first plastic body 23, that is, a side wall 231 parallel to the coil axis, has a coil A first groove 232 is provided at a corresponding creepage distance between the portion of the terminal 22 exposed from the first plastic body and the welding table 25 exposed from the first plastic body 23. The creepage distance between the portion of the coil terminal 22 exposed from the first plastic body and the welding table 5 is increased.

In this embodiment, a first barrier 235 is further provided on the side wall 231 corresponding to the long side of the rectangle of the first plastic body 23 at the top end thereof close to one end of the first plastic body 23 and protrudes upward. As a result, the creeping path from the portion of the coil terminal 22 exposed from the first plastic body through the iron core 21 to the normally open end contact creeps along the side wall 233 corresponding to the short side of the rectangle of the first plastic body 23. .

In this embodiment, in the first plastic body 23, a side wall 233 corresponding to the short side of the rectangle of the first plastic body 23, that is, a side wall 233 perpendicular to the coil axis, includes a portion of the coil terminal 22 exposed from the first plastic body. A corresponding creeping path second groove 234 is provided between the coil terminal 22 and one end of the iron core 21, and the normally open end is passed through the core from the portion of the coil terminal 22 exposed from the first plastic body using the second groove 234. Increase the creepage distance to the contact point.
In this embodiment, a second barrier 236 is further provided at the upper end of the first plastic body 23 in a corresponding creeping path between the other end of the iron core 21 and the normally open end contact, and the second barrier 236 is used to This further increases the creepage distance from the portion of the coil terminal 22 exposed from the first plastic body through the core to the normally open end contact.

In this embodiment, the movable contact spring and armature combination 3 further includes permanent magnets 34, the permanent magnets 34 are distributed along the longitudinal direction of the armature, that is, the axial direction of the coil, and are laminated with the armature 32, And the permanent magnet 34 is offset towards this one side of the other end of the first plastic body, and is actually offset towards this one side of the normally open side 312 of the movable contact spring piece 31 . That is, the intermediate line of the permanent magnet 34 is offset from the intermediate line of the armature 32, and is also offset to the normally open end of the magnetic circuit.

In this embodiment, in the two sets of movable contact spring pieces 31, the other side corresponding to the normally open side is further electrically connected by a connection sheet 35, and the connection sheet 35 is connected to the second plastic body 33. completely covered within. The connection sheet may be integrally formed between the two sets of movable contact spring pieces 31 on the other side corresponding to the normally open side, and in this case, the two sets of movable contact spring pieces 31 are the same part, and have approximately U It is a glyph. The connecting sheet may be a single component, and both ends of the connecting sheet are fixed to the other side corresponding to the normally open side of the two sets of movable contact spring pieces 31 by welding, or both ends of the connecting sheet are fixed to the other side corresponding to the normally open side of the two sets of movable contact spring pieces 31, or both ends of the connecting sheet are fixed to the other side corresponding to the normally open side of the two sets of movable contact spring pieces 31. It is hung on the other side corresponding to the normally open side of the movable contact spring pieces 31 and is injection molded, thereby realizing that both ends of the connection sheet are in close contact with the two sets of movable contact spring pieces 31, respectively.

In this embodiment, the connecting sheet 35 is close to the end position of the corresponding end of the second plastic body 33, thereby providing sufficient space for the permanent magnet 34.

The relays in this embodiment are a set of normally open relays.

In the ultra-compact relay with a high creepage distance of the present disclosure, the fixed contact spring injection molded on the first plastic body 23 includes only the normally open fixed contact spring piece 24 and the welding table 25 in the base portion 2, and the fixed contact spring is normally closed. It does not include a contact spring piece, the normally open fixed contact spring piece 24 is located at the other end of the first plastic body corresponding to the coil axis, the welding table 25 corresponds to the center position of the coil axis, and at least the movable contact spring and Used to support the welded lug structure of the armature combination. Such a structure of the present disclosure can improve the creepage distance between the coil terminal 22 and the fixed contact spring by removing the normally closed fixed contact spring piece in the pedestal part 2, and does not increase the volume of the relay. The premise is to effectively improve the creepage distance between the coil and the contacts, thereby meeting the increasingly higher insulation requirements for relay inputs and outputs in new energy, automotive and other fields.

The high creepage microminiature relay of the present disclosure has a corresponding creepage path in the first plastic body 23 between the coil terminals of the input and output (i.e., between the coil and the contact) of the relay and the welding table. A first groove 232 is provided, which can further improve the creepage distance between the coil and the contact. The present disclosure further provides a second plastic body 23 in the first plastic body 23 along this creepage path between the core 21 and the normally open end contacts corresponding to the coil terminals of the input and output (i.e., between the coil and the contact) of the relay. A groove 234 and a second barrier 236 are provided, and the first barrier 235 is used to create a creepage path from the side wall 231 corresponding to the long side of the rectangle of the first plastic body to the short side of the rectangle of the first plastic body. Creep can be made along the corresponding sidewall 233 creep, thereby further improving the creepage distance between the coil and the contact. As shown in FIGS. 5, 6, and 8, there are two creepage distances between the coil terminal and the normally open end contact, and one creepage distance is welded from the portion of the coil terminal 22 exposed from the first plastic body. The creepage distance S is from the part of the coil terminal 22 exposed from the first plastic body to the welding table 25 (because the welding table directly communicates with the normally open end contact), and the other The creepage distance of the book is from the part of the coil terminal 22 exposed from the first plastic body through the core to the normally open end contact, and the creepage distance of the creepage path is from the part of the coil terminal 22 exposed from the first plastic body to the core 21. It is the sum of the distance D1 to one end and the distance D2 from the other end of the iron core 21 to the normally open end contact.Of the two creepage distances, the shorter creepage distance is the distance between the relay coil and the contact. Creepage distance.

In the micro-relay with high creepage distance of the present disclosure, the permanent magnets 34 are distributed along the longitudinal direction of the armature, that is, the axial direction of the coil, and are laminated with the armature 32, and the permanent magnets 34 are arranged in the first plastic body. It is offset toward one side of the other end, that is, it is offset toward one side of the normally open side of the movable contact spring piece. As shown in FIGS. 14 to 16, such a structure of the present disclosure uses an unbalanced double magnetic circuit structure to provide a larger deflection force to the normally open end, and the normally closed contact of the seesaw type relay. It is possible to avoid a phenomenon in which the relay is difficult to drive or is difficult to drive due to the lack of pressure, and to operate the relay reliably. When the relay is in the initial state as shown in Figure 15, the magnetic force of the permanent magnet and the elastic reaction force of the movable contact spring are in the same direction, and armature restoring force = magnetic force of the permanent magnet + elastic reaction force of the movable contact spring. It is. In the structure of the prior art, contact pressure is generated due to overrun of the normally closed contact, that is, armature restoring force = magnetic force of the permanent magnet + elastic reaction force of the movable contact spring - normally closed contact pressure. As shown in Figure 16, the relay is in the operating state (normally open contacts are closed), and at this time the relay receives the coil attraction force, and the magnetic force of the permanent magnet and the elastic reaction force of the movable contact spring are in opposite directions. Sometimes, armature restoring force = electromagnetic attractive force of the coil + magnetic force of the permanent magnet - reaction force of the movable contact spring - contact pressure.

The ultra-compact relay with high creepage distance of the present disclosure is provided with only a welding table 25 having a welding lug structure for supporting the movable contact spring and armature combination at a position corresponding to the common end of the first plastic body, and is drawn out. No terminal is provided, and the other sides of the two sets of movable contact spring pieces 31 corresponding to the normally open side are integrally connected by the connection sheet 35, and the connection sheet 35 is connected to the corresponding end of the second plastic body 33. The proximity of the end positions provides sufficient space for the permanent magnets. As shown in FIG. 18, this structure of the present disclosure electrically connects two sets of movable contact spring pieces 31 via a connection sheet 35 to realize series connection of normally open end contacts, and the contact gap is It is twice the contact gap of the relay in the prior art, which can effectively improve the contact gap, the contact breaking pressure and the product's cutting ability, thus eliminating the need for external series connection. The pressure resistance of the contact gap and the distance for cutting the contact gap can be satisfied.

Example 2
As shown in FIGS. 19 to 21, the micro-compact relay with a high creepage distance of the present disclosure has the following differences from the first embodiment. In the fixed contact spring, the welding table 25 is further provided with a common end lead-out terminal 251 facing downward and exposed from the first plastic body 23, and the common end lead-out terminal 251 is directed toward the other end of the first plastic body 23. Offset. Thereby, the relay of this embodiment becomes two sets of normally open type relays.

The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure in any way. Although the present disclosure has been disclosed above with reference to preferred embodiments, it is not intended to limit the present disclosure. Those skilled in the art can make many possible changes and modifications to the technical solution of the present disclosure using the above disclosed technical content without departing from the scope of the technical solution of the present disclosure. or may be modified to equivalent equivalent embodiments. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the essence of the technology of the present disclosure without departing from the content of the technical solutions of the present disclosure should also be included within the protection scope of the technical solutions of the present disclosure.

Claims (11)

A microminiature relay with high creepage distance, comprising a pedestal part and a combination of a movable contact spring and an armature, the pedestal part including a coil, an iron core, a fixed contact spring, a coil terminal and a first plastic body, the first The plastic body integrates the coil, the iron core, the fixed contact spring, and the coil terminal into an integral member by injection molding, and the first plastic body completely covers the coil and covers the pole surfaces of both ends of the iron core. project from the first plastic body and extend to the upper end of the first plastic body, and are located at both ends of the first plastic body, and the portion of the coil terminal exposed from the first plastic body is located at one end of the first plastic body, the combination of the movable contact spring and armature includes two sets of movable contact spring pieces, an armature and a second plastic body, and the second plastic body is formed by injection molding to form the two sets. The movable contact spring piece and the armature are integrated into an integral member, a welding lug structure is provided at an intermediate position of the combination of the movable contact spring and the armature, and the combination of the movable contact spring and armature is connected to the base by the welding lug structure. In an ultra-compact relay with a high creepage distance, the two ends of the armature, which are mounted at an intermediate position on the top end of the part, and which are exposed from the second plastic body, are respectively engaged with the pole faces at both ends of the iron core. ,
The fixed contact spring injection molded on the first plastic body only includes a normally open fixed contact spring piece and a welding table, and does not include a normally closed fixed contact spring piece, and the normally open fixed contact spring piece is formed of the first plastic body. installed at the other end of the body, the welding table is installed corresponding to an intermediate position of the first plastic body, and is used to support at least the welding lug structure of the movable contact spring and armature combination; An ultra-compact relay with a high creepage distance, characterized in that the creepage distance on the outside of the first plastic body between the coil terminal and the fixed contact spring is improved by removing a normally closed fixed contact spring piece. The ultra-compact relay with high creepage distance according to claim 1, wherein the axis of the coil is installed horizontally, and the iron core is U-shaped. The welding lug structures are provided on both sides of an intermediate position of the combination of the movable contact spring and the armature, and the two welding lug structures are each provided integrally with a corresponding set of the movable contact spring pieces, and the second Exposed to the outside of the plastic body, the movable contact spring piece has an asymmetric structure with respect to the welded lug structure, and one side of the movable contact spring piece corresponding to the normally open fixed contact spring piece is provided with the second plastic body. A normally open side exposed to the outside of the body is provided, and a normally open movable contact is attached to the normally open side of the movable contact spring piece, and the other side of the movable contact spring piece corresponding to the normally open side is covered with the second plastic. The ultra-compact relay with a high creepage distance according to claim 1 or 2, characterized in that it is completely covered within the body. The horizontal cross section of the first plastic body has a rectangular or nearly rectangular shape, and the side wall corresponding to the long side of the rectangle of the first plastic body has a portion of the coil terminal exposed from the first plastic body and the first plastic body. A first groove is provided in a corresponding creeping path between the welding table exposed from the plastic body, and the first groove is used to weld the portion of the coil terminal exposed from the first plastic body to the welding table. The ultra-compact relay with a high creepage distance according to claim 1, characterized in that the creepage distance between the relay and the base is increased. The horizontal cross section of the first plastic body has a rectangular or nearly rectangular shape, and on the side wall corresponding to the long side of the rectangle of the first plastic body, a first barrier is further provided at the top end close to one end of the first plastic body. protrudes upward and extends so that a creepage path from the portion of the coil terminal exposed from the first plastic body through the iron core to the normally open end contact extends along the rectangular short side of the first plastic body. 2. The micro-compact relay with high creepage distance according to claim 1, characterized in that it creeps along a side wall corresponding to the . A second groove is provided in a side wall corresponding to a rectangular short side of the first plastic body in a creeping path corresponding to a portion between a portion of the coil terminal exposed from the first plastic body and one end of the iron core. and the second groove is used to increase the creepage distance from the portion of the coil terminal exposed from the first plastic body through the iron core to the normally open end contact. 5. The ultra-compact relay having a high creepage distance as described in 5. A second barrier is further provided at the upper end of the first plastic body in a corresponding creeping path between the other end of the iron core and the normally open end contact, and the second barrier is used to prevent the coil terminal from closing. The ultra-compact relay with high creepage distance according to claim 6, further increasing the creepage distance from the portion exposed from the first plastic body through the iron core to the normally open end contact. The movable contact spring and armature combination further includes permanent magnets, the permanent magnets being distributed along the longitudinal direction of the armature and laminated with the armature, and the permanent magnets being connected to the other end of the first plastic body. The ultra-compact relay with high creepage distance according to claim 3, characterized in that it is offset towards the direction of. In the movable contact spring piece, the welding table is further provided with a common end lead-out terminal facing downward and exposed from the first plastic body, and the common end lead-out terminal is offset toward the other end of the first plastic body. The ultra-compact relay with high creepage distance according to claim 8. In the two sets of movable contact springs, the other side corresponding to the normally open side is further electrically connected by a connecting sheet, and the connecting sheet is completely covered with the second plastic body, and the connecting sheet is The two sets of movable contact spring pieces are integrally connected by an integral molding method, or the connecting sheet is a single component, and both ends of the connecting sheet are respectively abutted or welded to the two sets of movable contact spring pieces. 9. The micro-compact relay with high creepage distance according to claim 8, characterized in that the relay is connected with a high creepage distance. 11. The superstructure with high creepage distance according to claim 10, characterized in that the connecting sheet is close to the end position of the corresponding end of the second plastic body, thereby providing sufficient space for the permanent magnet. small relay.

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