A magnetic latching relay

Abstract

The present invention discloses a magnetic latching relay, comprising a housing, a contact portion, a push card, an armature portion, a base, and a magnetic circuit portion; a first space with an upper opening is provided on one side of the base, and a second space with an upper opening is provided on the other side of the base; the contact portion is installed in the second space from top to bottom, and the upper opening is used for overtravel monitoring; a lower opening is also provided in the base at a position corresponding to the second space and its intersection with the first space, and a detachable bottom cover is installed at the lower opening, and contact pressure monitoring is used for contact pressure monitoring. The present invention can optimize the operability of relay assembly while realizing the convenience of contact gap monitoring, overtravel monitoring, and contact pressure monitoring, so that product process parameters can be monitored; at the same time, it can improve product assemblability, reduce the risk of foreign matter generation during the assembly process, further improve product reliability, and effectively ensure the electrical service life of the electromagnetic relay.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a magnetic latching relay. Background Art

[0002] The magnetic latching relay, a new type of relay developed in recent years, also functions as an automatic switch. Like other electromagnetic relays, it automatically connects and disconnects circuits. However, the normally closed or normally open state of a magnetic latching relay relies entirely on the action of a permanent magnet, and its switching state is triggered by a pulsed electrical signal of a certain width. The contacts of a magnetic latching relay are normally held open or closed by the magnetic force generated by a permanent magnet. To open or close the relay contacts, the coil is energized with a positive (or negative) DC pulse voltage, and the relay switches between open and closed states instantly. When the contacts are in the latching state, the coil does not need to be energized; the magnetic force of the permanent magnet alone maintains the relay's state.

[0003] Existing magnetic latching relays typically include a housing, a contact portion, a push-button, an armature portion, a base, and a magnetic circuit portion. The contact portion, push-button, armature portion, and magnetic circuit portion are each mounted in the base. The housing is mounted on the base and contains the contact portion, push-button, armature portion, and magnetic circuit portion within the space enclosed by the housing and base. The armature portion contains a magnet (i.e., a permanent magnet) that cooperates with the magnetic circuit portion to achieve a seesaw-like motion. The push-button is connected between the contact portion and the armature portion. While these existing magnetic latching relays can achieve increased contact spacing, improved current interruption performance, and increased product lifespan while maintaining compactness, they lack assembly operability and parameter monitoring capabilities after assembly. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a magnetic latching relay. Through structural improvements, while optimizing the assembly operability of the relay, it realizes the convenience of contact gap monitoring, overtravel monitoring and contact pressure monitoring, so that product process parameters can be monitored; at the same time, it can improve the assemblability of the product, reduce the risk of foreign matter generation during the assembly process, further enhance product reliability, and effectively ensure the electrical service life of the electromagnetic relay.

[0005] The present invention solves the technical problem by adopting a technical solution comprising: a magnetic latching relay comprising a housing, a contact portion, a push card, an armature portion, a base, and a magnetic circuit portion; the armature portion has a built-in magnetic latching magnet; the bottom of the housing surrounds the base and is fixed to the base, thereby enclosing a space between the housing and the base for accommodating the contact portion, the push card, the armature portion, and the magnetic circuit portion; a first space defined by side walls and having an upper opening is defined on one side of the base; the armature portion and the magnetic circuit portion cooperate and are mounted from top to bottom in the first space; a second space defined by side walls and having an upper opening is defined on the other side of the base, the second space being connected to the first space; the contact portion is mounted from top to bottom in the second space, and the upper opening is utilized for overtravel monitoring; a lower opening is further defined in the base at a position corresponding to the second space and its intersection with the first space, and a removable bottom cover is mounted on the lower opening; the push card is mounted from bottom to top in the base through the lower opening and connected between the armature portion and the contact portion, and the lower opening is utilized for contact pressure monitoring.

[0006] In the side wall of the base for enclosing the second space, at the matching position of the moving and static contacts corresponding to the contact part, a low wall structure is also set not higher than the matching position of the moving and static contacts, so as to utilize the low height of the low wall structure to monitor the contact gap.

[0007] The base is provided with a guide groove that enables the push card to move back and forth horizontally, and guide columns are respectively provided on both sides of the width of the push card. The guide columns on both sides of the push card are respectively engaged in the corresponding guide grooves of the base, so that the push card can move back and forth along the length direction of the push card.

[0008] A first card slot is provided at one end of the length of the push card, and the armature part is provided with a push arm, and the push arm of the armature part is inserted into the first card slot from top to bottom; a second card slot is provided at the other end of the length of the push card, and the contact part includes an active spring, and the active spring of the contact part is inserted into the second card slot from top to bottom.

[0009] An active contact is mounted on one side of an inner section of the end of the active spring, and the end of the active spring fits in the second slot of the push card; a bent portion is provided at the end of the active spring; and in the second slot, an inclined surface is provided on the upper section of the slot wall on the side of the active spring facing away from the moving contact, so as to enable sliding assembly with the end of the active spring.

[0010] The contact portion further comprises a main static spring piece and an active spring lead-out piece, the upper portion of the main static spring piece being provided with a main static contact, the active spring lead-out piece and the main static spring piece being respectively inserted into corresponding slots of the base from top to bottom; the upper end of the active spring piece being fixed to the upper end of the active spring lead-out piece; the lower portion of the active spring lead-out piece being provided with a U-shaped opening so as to span from the outside of both sides of the width of the push card; and notches being provided on both sides of the width of the push card to give way to the active spring lead-out piece.

[0011] The guide groove is communicated with the lower opening. In the bottom cover plate, a guide strip is provided at a position corresponding to the guide column of the push card, and the guide column of the push card slides and presses on the corresponding guide strip. In the guide column, the surfaces in contact with the guide groove are respectively set as arc structures; the upper end surface of the guide strip is also set as an arc surface; in the bottom cover plate, adaptive through holes are also provided at positions corresponding to the main static spring piece and the active spring lead-out piece, so that the lead-out pins of the main static spring piece and the active spring lead-out piece can pass downward through the corresponding through holes to the outside of the base.

[0012] The relay also includes an arc-extinguishing magnetic steel assembly. A slot is provided on the inner side of the side wall of the shell. The arc-extinguishing magnetic steel assembly is assembled in the slot of the shell and the position of the arc-extinguishing magnetic steel assembly is located at a position corresponding to the matching position of the moving and static contacts; the arc-extinguishing magnetic steel assembly is composed of a thin-sheet arc-extinguishing magnetic steel and a thin-sheet magnetic isolation sheet stacked together; the arc-extinguishing magnetic steel assembly is fixed in the slot of the shell by an interference fit.

[0013] The arc-extinguishing magnetic steel component is partially accommodated in the slot of the shell. In the low wall structure of the base, a corresponding adaptive recess is provided at the part corresponding to the part where the arc-extinguishing magnetic steel component is exposed from the slot of the shell. The top of the low wall structure contacts the notch of the slot, so that the low wall structure is used to block the direction in which the arc-extinguishing magnetic steel component is exposed into the shell.

[0014] The relay also includes an auxiliary contact part, which includes an auxiliary dynamic spring lead-out piece, an auxiliary dynamic spring piece and an auxiliary dynamic contact; a third card slot with a side opening is provided on one side of the width of the push card; the auxiliary dynamic spring lead-out piece is laterally inserted into the corresponding slot of the base, the auxiliary dynamic spring piece is L-shaped, the auxiliary dynamic contact is fixed to the bottom end of the vertical side of the L-shape of the auxiliary dynamic spring piece, the top end of the vertical side of the L-shape of the auxiliary dynamic spring piece is fixed to the top end of the auxiliary dynamic spring lead-out piece, and the free end of the horizontal side of the L-shape of the auxiliary dynamic spring piece is adapted to the third card slot of the push card.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention utilizes a second space, enclosed by side walls and having an upper opening, on the other side of the base. This second space is connected to the first space. The contact portion is installed from top to bottom in the second space, and the upper opening is utilized for overtravel monitoring. A lower opening is also provided in the base, corresponding to the junction between the second space and the first space, and a removable bottom cover is installed in the lower opening. The push card is installed from bottom to top in the base, connected between the armature portion and the contact portion, and the lower opening is utilized for contact pressure monitoring. This structure of the present invention utilizes the open top of the base when the housing is not installed, facilitating product overtravel measurement and monitoring. The addition of a lower opening at the bottom of the base facilitates contact pressure monitoring when the push card is not installed. Furthermore, this structure allows the contact portion and magnetic circuit components to be installed from top to bottom after assembly, while the push card can be installed from bottom to top, simplifying the automated installation process.

[0017] 2. The present invention also employs a low wall structure within the side walls of the base that enclose the second space, corresponding to the mating position of the moving and static contacts of the contact portion. This structure utilizes the low height of the low wall structure to monitor contact gaps. This structure utilizes the monitoring space above the low wall structure near the contact position of the base. After assembly, product parameters are monitored in the monitoring space to ensure compliance. After monitoring is complete, the outer shell is installed. This facilitates contact gap monitoring, overtravel monitoring, and contact pressure monitoring, allowing for monitoring of product process parameters.

[0018] 3. The present invention utilizes a bend at the end of the active spring; in the second slot, the slot wall on the side facing away from the moving contact relative to the active spring has an inclined surface at its upper section, enabling sliding assembly with the end of the active spring. This structure utilizes the bend in the moving spring and the corresponding slope on the push card. The slope cooperates with the bend at the lower end of the moving spring, allowing for sliding assembly and connection with the push card. This reduces the generation of foreign matter during assembly due to scraping between the active spring and the push card.

[0019] 4. The present invention adopts a method of arranging a slot on the inner side of the side wall of the housing, assembling the arc-extinguishing magnetic steel assembly in the slot of the housing and positioning the arc-extinguishing magnetic steel assembly in a position corresponding to the position of the moving and static contacts. The arc-extinguishing magnetic steel assembly is composed of a thin sheet of arc-extinguishing magnetic steel and a thin sheet of magnetic isolation sheet stacked together. The arc-extinguishing magnetic steel assembly is partially accommodated in the slot of the housing. The low wall structure of the base is provided with a correspondingly adapted notch in the portion corresponding to the portion where the arc-extinguishing magnetic steel assembly is exposed in the slot of the housing. The top of the low wall structure abuts against the notch of the slot, so that the low wall structure is used to block the direction in which the arc-extinguishing magnetic steel assembly is exposed in the housing. This structure of the present invention uses the low wall structure and the slot wall of the housing slot to block the contact portion and the arc-extinguishing magnetic steel, thereby blocking the heat from the burning of the contact switching arc and reducing the thermal attenuation of the magnetic properties of the arc-blowing magnetic steel caused by the burning of the arc.

[0020] 5. The present invention adopts a third slot with a sideways opening on one side of the width of the push card; the auxiliary spring lead-out piece is laterally inserted into the corresponding slot of the base, the auxiliary spring piece is L-shaped, the auxiliary moving contact is fixed to the bottom end of the vertical side of the L-shaped auxiliary spring piece, the top end of the vertical side of the L-shaped auxiliary spring piece is fixed to the top end of the auxiliary spring lead-out piece, and the free end of the horizontal side of the L-shaped auxiliary spring piece is adapted to the third slot of the push card. This structure of the present invention enables the auxiliary contacts and the main contacts to be driven by the same part (i.e., the push card), avoiding the risk of failure of the different parts to cooperate with each other when driven, resulting in unreliable indication status; this structure can improve the reliability of the existing action feedback function.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the magnetic latching relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the exploded three-dimensional structure of an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the exploded three-dimensional structure of an embodiment of the present invention (rotated at one angle);

[0024] Figure 3 Schematic diagram of the three-dimensional structure of an embodiment of the present invention (excluding the housing);

[0025] Figure 4 is a front view of an embodiment of the present invention (excluding the housing);

[0026] Figure 5 is a cross-sectional view of an embodiment of the present invention (excluding the housing, magnetic circuit portion and armature portion, and cut along the length direction of the relay);

[0027] Figure 6 is a cross-sectional view of an embodiment of the present invention (excluding the housing and cut along a cross-sectional plane in the width direction of the relay);

[0028] Figure 7 is a cross-sectional view of an embodiment of the present invention (cut along another cross-sectional plane in the width direction of the relay);

[0029] Figure 8 is a schematic diagram of the cooperation between the auxiliary contact portion, the push card and the contact portion of an embodiment of the present invention;

[0030] Figure 9 Schematic diagram of the structure of an embodiment of the present invention (excluding the housing and base);

[0031] Figure 10 2 is a schematic diagram of the three-dimensional structure of the base and the push card in cooperation with each other according to an embodiment of the present invention (with the bottom surface turned upward);

[0032] Figure 11 1 is a schematic diagram of the three-dimensional structure of the housing and arc-extinguishing magnetic steel assembly of an embodiment of the present invention;

[0033] Figure 12 is a schematic diagram of the auxiliary contact portion and the push card in cooperation with each other in an embodiment of the present invention;

[0034] Figure 13 is a cross-sectional view of the base and the push card in cooperation with each other according to an embodiment of the present invention;

[0035] Figure 14 2 is a schematic structural diagram of a bottom cover plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] Example

[0037] See also Figures 1 to 14As shown, a magnetic latching relay of the present invention comprises a housing 1, a contact part 2, a push card 3, an armature part 4, a base 5 and a magnetic circuit part 6; the armature part 4 has a built-in magnetic latching magnet, and the armature part 4 is made of two armatures 41 and a magnetic steel in an I-shape and is made by an injection molding process. The armature part 4 is also provided with a push arm 42 for cooperating with the push card 3; the magnetic circuit part 6 is composed of a coil 61 and a yoke 62; the bottom of the housing 1 is surrounded by the base 5 and is fixed to the base 5 to form a space between the housing 1 and the base 5 for accommodating the contact part 2, the push card 3, the armature part 4 and the magnetic circuit part 6; one side of the base 5 is provided with a first space 52 surrounded by a side wall 51 and having an upper opening, the armature part 4 and the magnetic circuit part 6 cooperate and are installed in the first space 52 from top to bottom, the armature When part 4 and the magnetic circuit part 6 are matched, the I-shaped openings on both sides of the armature part 4 are respectively matched with the yoke 62, so that the armature part 4 can realize a seesaw-like action when positive and negative currents are passed through the coil; the other side of the base 5 is provided with a second space 54 surrounded by side walls 53 and having an upper opening, and the second space 54 is connected to the first space 52, the contact part 2 is installed from top to bottom in the second space 54, and the upper opening is used for overtravel monitoring; in the base 5, a lower opening 55 is also provided at the position corresponding to the second space and its junction with the first space, and a detachable bottom cover plate 7 is installed at the lower opening, the push card 3 is installed from bottom to top in the base 5 through the lower opening and is connected between the armature part 4 and the contact part 2, and the lower opening 55 is used for contact pressure monitoring.

[0038] In this embodiment, in the side wall 53 of the base 5 for enclosing the second space 54, at the matching position of the moving and static contacts corresponding to the contact part, a low wall structure 58 is also provided which is not higher than the matching position of the moving and static contacts, so as to utilize the low height of the low wall structure 58 to monitor the contact gap.

[0039] In this embodiment, the base 5 is provided with a guide groove 57 that enables the push card 3 to move back and forth horizontally, and guide columns 31 are respectively provided on both sides of the width of the push card 3. The guide columns 31 on both sides of the push card 3 are respectively engaged in the corresponding guide grooves 57 of the base, so that the push card 3 can move back and forth along the length direction of the push card 3.

[0040] In this embodiment, a first card slot 32 is provided at one end of the length of the push card 3, and the push arm 42 of the armature part 4 is inserted from top to bottom into the first card slot 32; a second card slot 33 is provided at the other end of the length of the push card 3, and the contact part 2 includes an active spring 21, and the active spring 21 of the contact part 2 is inserted from top to bottom into the second card slot 33.

[0041] In this embodiment, an active contact 22 is mounted on one side of the inner end of the active spring 21. The end of the active spring 21 fits in the second slot 33 of the push card 3. A bent portion 211 is provided at the end of the active spring 21. In the second slot 33, an inclined surface 331 is provided at the upper portion of the slot wall on the side opposite to the active spring facing the moving contact to enable sliding assembly with the end of the active spring 21.

[0042] In this embodiment, the contact portion 2 further includes a main static spring piece 24 and an active spring lead-out piece 23. A main static contact 25 is provided on the upper portion of the main static spring piece 24. The active spring lead-out piece 23 and the main static spring piece 24 are respectively inserted into the corresponding slots of the base 5 from top to bottom. The interference fit with the corresponding slots of the base 5 can be achieved by providing convex buds on the active spring lead-out piece 23 and the main static spring piece 24. The upper end of the active spring piece 21 is fixed to the upper end of the active spring lead-out piece 23. The lower portion of the active spring lead-out piece 23 is provided with a U-shaped opening to cross from the outside of both sides of the width of the push card 3, and both sides of the width of the push card are provided with recesses 34 to make way for the active spring lead-out piece 23.

[0043] In this embodiment, the guide groove 57 is communicated with the lower opening 55, and a guide bar 71 is provided in the bottom cover plate 7 at a position corresponding to the guide column 31 of the push card 3, and the guide column 31 of the push card 3 slides and presses on the corresponding guide bar 71; in the guide column 31, the surface in contact with the guide groove 57 is respectively set as an arc structure; the upper end surface of the guide bar 71 is also set as an arc surface; in the bottom cover plate 7, adaptive through holes 72 are also provided at positions corresponding to the main static spring piece 24 and the active spring lead-out piece 23, so that the lead-out pins of the main static spring piece 24 and the active spring lead-out piece 23 can pass downward to the outside of the base through the corresponding through holes.

[0044] In this embodiment, the relay also includes an arc-extinguishing magnetic steel assembly 8. A slot 11 is provided on the inner side of the side wall of the shell 1. The arc-extinguishing magnetic steel assembly 8 is assembled in the slot 11 of the shell and the position of the arc-extinguishing magnetic steel assembly 8 is at a position corresponding to the matching position of the moving and static contacts; the arc-extinguishing magnetic steel assembly 8 is composed of a thin-sheet arc-extinguishing magnetic steel 81 and a thin-sheet magnetic isolation sheet 82 stacked together; the arc-extinguishing magnetic steel assembly 8 is fixed in the slot 11 of the shell 1 by an interference fit.

[0045] In this embodiment, only a portion of the arc-extinguishing magnetic steel assembly 8 is accommodated in the slot 11 of the housing 1, and the other portion is exposed outside the slot of the housing. In the low wall structure 58 of the base 5, a corresponding adaptive recess 56 is provided in the portion corresponding to the portion of the arc-extinguishing magnetic steel assembly exposed in the slot of the housing (that is, the arc-extinguishing magnetic steel assembly 8 is accommodated in the recess 56). The top of the low wall structure 58 abuts against the notch of the slot 11, so as to utilize the low wall structure 58 to block the direction in which the arc-extinguishing magnetic steel assembly is exposed into the housing.

[0046] In this embodiment, the relay also includes an auxiliary contact part 9, which includes an auxiliary dynamic spring lead-out piece 91, an auxiliary dynamic spring piece 92, an auxiliary dynamic contact 93, an auxiliary static spring piece 94 and an auxiliary static contact 95; one side of the width of the push card 3 is provided with a third card slot 35 with a lateral opening; the auxiliary dynamic spring lead-out piece 91 and the auxiliary static spring piece 94 are respectively inserted laterally into the corresponding slots of the base 5, the auxiliary dynamic spring piece 92 is L-shaped, the auxiliary dynamic contact 93 is fixed to the bottom end of the vertical side of the L-shape of the auxiliary dynamic spring piece 92, the top end of the vertical side of the L-shape of the auxiliary dynamic spring piece 92 is fixed to the top end of the auxiliary dynamic spring lead-out piece 91, and the free end of the horizontal side of the L-shape of the auxiliary dynamic spring piece 92 is adapted to the third card slot 35 of the push card 3.

[0047] The present invention provides a magnetic latching relay, wherein the other side of the base 5 is provided with a second space 54 enclosed by side walls 53 and having an upper opening. The second space 54 is connected to the first space 52. The contact portion 2 is installed from top to bottom in the second space 54, and the upper opening is used for overtravel monitoring. The base 5 is also provided with a lower opening 55 corresponding to the intersection of the second space and the first space, and a removable bottom cover plate 7 is installed at the lower opening 55. The push card 3 is installed from bottom to top in the base 5 through the lower opening 55 and connected between the armature portion 4 and the contact portion 2. The lower opening is used for contact pressure monitoring. This structure of the present invention utilizes the open state of the top of the base 5 when the housing 1 is not installed to facilitate product overtravel measurement and monitoring. The addition of the lower opening 55 at the bottom of the base 5 facilitates product contact pressure monitoring when the push card 3 is not installed. At the same time, this structure allows the contact part 2 and the magnetic circuit part 6 to be installed from top to bottom after assembly, while the push card 3 can be installed from bottom to top, which is simpler in terms of realizing an automated installation process.

[0048] The magnetic latching relay of the present invention also employs a low wall structure 58, located no higher than the mating position of the moving and static contacts, within the side walls 53 of the base that enclose the second space 54. This structure utilizes the low height of the low wall structure 58 to monitor contact gap. This structure utilizes the monitoring space above the low wall structure near the contact position to form a monitoring space. After assembly, the product parameters are monitored in the monitoring space. After monitoring is complete, the relay is then installed in the outer shell. This facilitates contact gap monitoring, overtravel monitoring, and contact pressure monitoring, allowing for monitoring of product process parameters.

[0049] A magnetic latching relay according to the present invention features a bent portion 211 at the end of an active reed 21. A second latching slot 33 includes a sloped surface 331 on the upper portion of the slot wall, on the side of the slot opposite the active reed facing the movable contact, to facilitate sliding assembly with the end of the active reed 21. This structure utilizes the bend in the movable reed 21 and the corresponding slope in the push card 3. The slope mates with the bent lower end of the movable reed, allowing for sliding assembly and connection with the push card. This reduces the risk of foreign matter being scraped between the active reed and the push card during assembly.

[0050] A magnetic latching relay according to the present invention utilizes a slot 11 provided on the inner side of a sidewall of a housing 1. An arc-extinguishing magnetic steel assembly 8 is assembled into the slot 11 of the housing, and the arc-extinguishing magnetic steel assembly is positioned so as to align with the moving and static contacts. The arc-extinguishing magnetic steel assembly 8 is composed of a thin arc-extinguishing magnetic steel 81 and a thin magnetic shielding sheet 82 stacked together. A corresponding recess 56 is provided in the low wall structure 58 of the base 5, corresponding to the portion of the arc-extinguishing magnetic steel assembly 8 exposed from the slot of the housing. The top of the low wall structure 58 abuts the notch of the slot 11, thereby shielding the arc-extinguishing magnetic steel assembly 8 from the direction of exposure to the housing. This structure of the present invention utilizes the low wall structure and the slot wall of the housing slot to block the contact portion and the arc-extinguishing magnetic steel, thereby blocking the heat from the burning arc of the contact switching arc and reducing the thermal attenuation of the magnetic properties of the arc-blowing magnetic steel caused by the burning arc.

[0051] A magnetic latching relay according to the present invention utilizes a third slot 35 with a sideways opening on one side of the width of the push card 3. The auxiliary spring lead-out piece 92 is laterally inserted into a corresponding slot on the base 5. The auxiliary spring 92 is L-shaped, and the auxiliary movable contact 93 is fixed to the bottom end of the vertical side of the L-shape of the auxiliary spring. The top end of the vertical side of the L-shape of the auxiliary spring 92 is fixed to the top end of the auxiliary spring lead-out piece 91. The free end of the horizontal side of the L-shape of the auxiliary spring 92 fits into the third slot 35 of the push card. This structure of the present invention enables the auxiliary contacts and the main contacts to be driven by the same component (i.e., the push card), avoiding the risk of failure of the different components to cooperate when driven, resulting in unreliable indication of the status. This structure can also improve the reliability of existing action feedback functions.

[0052] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the art can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A magnetic latching relay comprising a housing, a contact portion, a push latch, an armature portion, a base, and a magnetic circuit portion; the armature portion having a built-in latching magnet; the bottom of the housing surrounding the base and being fixed thereto, thereby defining a space between the housing and the base for accommodating the contact portion, push latch, armature portion, and magnetic circuit portion; a first space defined by side walls and open at the top is defined on one side of the base; the armature portion and magnetic circuit portion cooperate and are mounted from top to bottom in the first space; and characterized in that: The other side of the base is provided with a second space surrounded by side walls and having an upper opening, and the second space is communicated with the first space. The contact part is installed in the second space from top to bottom, and the upper opening is used for overtravel monitoring; in the base, a lower opening is also provided corresponding to the position of the second space and the intersection with the first space, and a removable bottom cover plate is installed at the lower opening. The push card is installed in the base from bottom to top through the lower opening and is connected between the armature part and the contact part, and the contact pressure is monitored using the lower opening; the push card is installed in the bottom of the second space from bottom to top. During assembly, the contact part is first installed in the second space from top to bottom and then the push card is installed in the bottom of the second space from bottom to top.

2. The magnetic latching relay according to claim 1, wherein: In the side wall of the base for enclosing the second space, at the matching position of the moving and static contacts corresponding to the contact part, a low wall structure is also set not higher than the matching position of the moving and static contacts, so as to utilize the low height of the low wall structure to monitor the contact gap.

3. The magnetic latching relay according to claim 1, wherein: The base is provided with a guide groove that enables the push card to move back and forth horizontally, and guide columns are respectively provided on both sides of the width of the push card. The guide columns on both sides of the push card are respectively engaged in the corresponding guide grooves of the base, so that the push card can move back and forth along the length direction of the push card.

4. The magnetic latching relay according to claim 3, wherein: A first card slot is provided at one end of the length of the push card, and the armature part is provided with a push arm, and the push arm of the armature part is inserted into the first card slot from top to bottom; a second card slot is provided at the other end of the length of the push card, and the contact part includes an active spring, and the active spring of the contact part is inserted into the second card slot from top to bottom.

5. The magnetic latching relay according to claim 4, characterized in that: An active contact is mounted on one side of an inner section of the end of the active spring, and the end of the active spring fits in the second slot of the push card; a bent portion is provided at the end of the active spring; and in the second slot, an inclined surface is provided on the upper section of the slot wall on the side of the active spring facing away from the moving contact, so as to enable sliding assembly with the end of the active spring.

6. The magnetic latching relay according to claim 5, characterized in that: The contact portion further comprises a main static spring piece and an active spring lead-out piece, the upper portion of the main static spring piece being provided with a main static contact, the active spring lead-out piece and the main static spring piece being respectively inserted into corresponding slots of the base from top to bottom; the upper end of the active spring piece being fixed to the upper end of the active spring lead-out piece; the lower portion of the active spring lead-out piece being provided with a U-shaped opening so as to span from the outside of both sides of the width of the push card; and notches being provided on both sides of the width of the push card to give way to the active spring lead-out piece.

7. The magnetic latching relay according to claim 6, wherein: The guide groove is communicated with the lower opening. In the bottom cover plate, a guide strip is provided at a position corresponding to the guide column of the push card, and the guide column of the push card slides and presses on the corresponding guide strip. In the guide column, the surfaces in contact with the guide groove are respectively set as arc structures; the upper end surface of the guide strip is also set as an arc surface; in the bottom cover plate, adaptive through holes are also provided at positions corresponding to the main static spring piece and the active spring lead-out piece, so that the lead-out pins of the main static spring piece and the active spring lead-out piece can pass downward through the corresponding through holes to the outside of the base.

8. The magnetic latching relay according to claim 2, characterized in that: The relay also includes an arc-extinguishing magnetic steel assembly. A slot is provided on the inner side of the side wall of the shell. The arc-extinguishing magnetic steel assembly is assembled in the slot of the shell and the position of the arc-extinguishing magnetic steel assembly is located at a position corresponding to the matching position of the moving and static contacts; the arc-extinguishing magnetic steel assembly is composed of a thin-sheet arc-extinguishing magnetic steel and a thin-sheet magnetic isolation sheet stacked together; the arc-extinguishing magnetic steel assembly is fixed in the slot of the shell by an interference fit.

9. The magnetic latching relay according to claim 8, characterized in that: The arc-extinguishing magnetic steel component is partially accommodated in the slot of the shell. In the low wall structure of the base, a corresponding adaptive recess is provided at the part corresponding to the part where the arc-extinguishing magnetic steel component is exposed in the slot of the shell. The top of the low wall structure contacts the notch of the slot, so that the low wall structure is used to block the direction in which the arc-extinguishing magnetic steel component is exposed into the shell.

10. The magnetic latching relay according to claim 1, characterized in that: The relay also includes an auxiliary contact part, which includes an auxiliary dynamic spring lead-out piece, an auxiliary dynamic spring piece and an auxiliary dynamic contact; a third card slot with a side opening is provided on one side of the width of the push card; the auxiliary dynamic spring lead-out piece is laterally inserted into the corresponding slot of the base, the auxiliary dynamic spring piece is L-shaped, the auxiliary dynamic contact is fixed to the bottom end of the vertical side of the L-shape of the auxiliary dynamic spring piece, the top end of the vertical side of the L-shape of the auxiliary dynamic spring piece is fixed to the top end of the auxiliary dynamic spring lead-out piece, and the free end of the horizontal side of the L-shape of the auxiliary dynamic spring piece is adapted to the third card slot of the push card.

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