A DC relay with an insulating base

Abstract

The invention discloses a DC relay with an insulating base, comprising a ceramic cover, a static contact, a moving spring, a push rod component, a yoke iron plate and an insulating base; the yoke iron plate is connected to the bottom end of the ceramic cover; two static contacts are respectively fixed to the top end of the ceramic cover; the moving spring is installed at the upper end of the push rod component; the insulating base is installed on the yoke iron plate, and the insulating base includes a bottom plate and a surrounding wall protruding upward from the edge of the bottom plate; the bottom plate is provided with a through hole for the push rod component to pass through; the through hole is also extended with side holes at the projection positions corresponding to the two ends of the moving spring, so that the push rod component equipped with the moving spring can completely pass through the insulating base, so that the moving spring is first installed in the magnetic circuit part and then installed in the insulating base during assembly. The invention is convenient for realizing automatic assembly and reducing the generation of plastic scraps, and can effectively prevent arc splashes from falling into the push rod component when the product is working, affecting the contact performance of the contact point.

Description

Technical Field

[0001] The invention relates to a DC relay, in particular to a DC relay with an insulating base. Background Art

[0002] Most existing DC relays adopt a dynamic spring direct-acting type (also known as a solenoid direct-acting type). The contact part of this DC relay includes two static contacts and a dynamic component. The dynamic component includes a dynamic spring part and a push rod component. The dynamic spring part is composed of a dynamic spring and dynamic contacts at both ends of the dynamic spring. The dynamic spring is direct-acting. When the dynamic contacts at both ends of the dynamic spring are in contact with the two static contacts respectively, current flows into one of the static contacts, passes through the dynamic spring, and flows out from the other static contact; the dynamic spring part is installed at one end of the push rod component, and the other end of the push rod component is connected to the moving iron core. When the coil is connected to the current and the moving iron core moves upward, the moving iron core drives the push rod component to move upward, so that the moving contacts at both ends of the dynamic spring contact with the two static contacts respectively. When the coil is disconnected from the current, the moving iron core moves downward under the action of the reset spring, and the moving iron core drives the push rod component downward, so that the moving contacts at both ends of the dynamic spring are separated from the two static contacts respectively. In the prior art, the contact portion of this type of DC relay is usually housed in a ceramic cover, and the movable spring portion and the magnetic circuit portion are separated by a yoke iron plate. In other words, the movable spring portion is arranged above the yoke iron plate, or it can be said that the ceramic cover and the yoke iron plate form an arc extinguishing chamber. When a large arc exists during the electrical life of the relay, the arc will stretch and hit the yoke iron plate and the metal on the edge of the yoke iron plate, causing premature failure. In addition, the metal splashed by the evaporation of the contact will fall on the conductive yoke iron plate, thereby reducing the electrical creepage distance. When the splashed material falls into the moving clearance hole of the yoke iron plate, it will cause a jamming phenomenon, making the movable component unable to move and rendering the product unusable. In order to solve this technical problem, the method adopted in the prior art is to install an insulating base at the bottom of the cavity of the ceramic cover, that is, on the yoke plate, to effectively isolate the metal splashes, thereby increasing the electrical creepage distance; however, this insulating base structure also has the following disadvantages: first, since in the relay assembly process, the insulating base needs to be fixed on the yoke plate first, and then the dynamic and static components are installed, which makes it inconvenient to realize automated assembly. In this method of installing the insulating base first, in the subsequent process, since the dynamic and static components may be disassembled and assembled many times during the testing process, the dynamic and static components may rub against the insulating base, which is easy to cause plastic scraping and affect the normal use of the relay; second, since the insulating base is usually designed as a cavity structure with an opening facing upward, arc splashes can easily enter the push rod component and affect the normal movement of the push rod component; third, there is usually a certain gap between the insulating base and the ceramic cover, and metal evaporated particles will fall into the gap, which cannot play a complete isolation role. In the later stage of the service life, the metal splashes on the inner wall of the ceramic cover and the metallized layer at the bottom of the ceramic cover will form a metal path, resulting in poor insulation. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a DC relay with an insulating base. Through structural improvements, it is convenient to realize automatic assembly and reduce the generation of plastic scrapings. It can also effectively prevent arc splashes from falling into the push rod component during product operation and affecting the contact performance.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a DC relay with an insulating base, including a ceramic cover, a static contact, a moving reed, a push rod component, a yoke iron plate and an insulating base; the yoke iron plate is connected to the bottom end of the ceramic cover and forms a cavity with the ceramic cover; two static contacts are respectively fixed to the top end of the ceramic cover and the bottom ends of the static contacts extend into the cavity; the moving reed is installed at the upper end of the push rod component, and the two ends of the moving reed are respectively matched with the bottom ends of the two static contacts, and the lower end of the push rod component passes through the yoke iron plate and is connected to the magnetic circuit part below; the insulating base is installed on the yoke iron plate, and the insulating base includes a bottom The plate and the bottom plate have an upwardly protruding wall at the edge; the bottom plate is provided with a through hole for allowing the push rod component to pass through; the through hole is also extended with side holes at the projection positions corresponding to the two ends of the movable spring, so that the push rod component equipped with the movable spring can completely pass through the insulating base, thereby realizing that the movable spring is first installed in the magnetic circuit part and then in the insulating base during assembly; in the bottom plate, the outer edge of the projection position corresponding to the two ends of the movable spring is also protruded upward with a retaining wall that can roughly approach the edges of the two ends of the movable spring, and the two retaining walls are respectively half-wrapped to effectively prevent arc spatters at the contact position from entering the push rod component.

[0005] The surrounding wall of the insulating base is in a half-enclosed shape corresponding to the outer side of the projection position of the two ends of the movable spring piece, and the retaining wall of the insulating base is located within the surrounding wall of the insulating base.

[0006] The height of the retaining wall of the insulating base is greater than the height of the surrounding wall of the insulating base, and an arc extinguishing groove is formed between the retaining wall of the insulating base and the surrounding wall of the insulating base; a grid structure is also provided in the arc extinguishing groove, and the height of the grid structure is roughly the same as the height of the surrounding wall.

[0007] The grid structure is substantially arranged along the length direction of the movable spring.

[0008] The retaining wall of the insulating base is arranged at the edge of the side hole of the bottom plate.

[0009] The distance between the two end edges of the movable spring is smaller than the distance between the outer edges of the two static contacts.

[0010] The upper portions of both end edges of the movable spring piece are configured as arc shapes, and the bottom portions of the outer edges of the two static contacts are also configured as arc shapes.

[0011] In the ceramic cover, at the position of the inner wall, limiting ribs are provided on both sides corresponding to the length direction of the movable spring piece, which are used to limit the movable spring piece from deviating to both sides of the width during the up and down movement. The limiting ribs protrude to the edge of the retaining wall to block the arc, so that the arc is blocked in the arc extinguishing cavity surrounded by the limiting ribs, the retaining wall, the inner wall of the ceramic cover and the insulating base.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention extends the through-hole of the base plate to include side holes at the projected positions corresponding to the two ends of the movable spring, allowing the push rod assembly equipped with the movable spring to completely pass through the insulating base. This allows the movable spring to be installed into the magnetic circuit portion first and then into the insulating base during assembly. The base plate also includes retaining walls projecting upward from the outer edges corresponding to the projected positions of the two ends of the movable spring, which can roughly approach the edges of the two ends of the movable spring. The two retaining walls are each half-wrapped to effectively block arc spatter at the contact position from entering the push rod assembly. This structure of the present invention not only facilitates automated assembly and reduces the generation of plastic scraping, but also effectively prevents arc spatter from falling into the push rod assembly during product operation and affecting contact performance.

[0014] 2. The present invention adopts the method of designing the distance between the two end edges of the movable spring to be smaller than the distance between the outer edges of the two static contacts, and setting the upper parts of the two end edges of the movable spring to be arc-shaped, and setting the bottoms of the outer edges of the two static contacts to be arc-shaped, so that the arc generated between the movable and static contacts can be effectively guided into the arc extinguishing groove of the insulating base, thereby improving the arc extinguishing ability.

[0015] 3. The present invention adopts the use of position-limiting ribs on the inner side wall of the ceramic cover, corresponding to the two sides of the length direction of the movable spring, which are used to limit the displacement of the movable spring to the two sides of the width during the up and down movement. The position-limiting ribs protrude to the edge of the retaining wall to block the arc, so that the arc is blocked in the arc-extinguishing cavity surrounded by the position-limiting ribs, retaining wall, inner wall of the ceramic cover and insulating base. The present invention uses the position-limiting ribs on the inner side wall of the ceramic cover to block the arc, so that the arc is confined in the arc-extinguishing cavity surrounded by the position-limiting ribs, retaining wall, inner wall of the ceramic cover and insulating base, which can prevent the arc from entering the central area and burning the candle push rod component.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the DC relay with an insulating base of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 1 is a schematic diagram of an embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of a portion of an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of a movable spring piece assembled on a push rod component according to an embodiment of the present invention;

[0020] Figure 4 1 is an exploded schematic diagram of an assembly of a ceramic cover, an insulating base, and a yoke plate according to an embodiment of the present invention;

[0021] Figure 5 This is a cross-sectional view of the structure of the ceramic cover equipped with the static contact and the insulating base in accordance with an embodiment of the present invention;

[0022] Figure 6 Schematic diagram of the coordination between the static contact and the movable spring in an embodiment of the present invention;

[0023] Figure 7 is a schematic diagram of the three-dimensional structure of an insulating base according to an embodiment of the present invention;

[0024] Figure 8 1 is a schematic diagram of the three-dimensional structure of the ceramic cover (bottom facing upward) according to an embodiment of the present invention;

[0025] Figure 9 is a cross-sectional view of an insulating base according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Example

[0027] See also Figures 1 to 9As shown, a DC relay with an insulating base of the present invention includes a ceramic cover 1, a static contact 2, a moving reed 3, a push rod component 4, a yoke iron plate 5 and an insulating base 6; the yoke iron plate 5 is connected to the bottom end of the ceramic cover 1 and forms a cavity 11 with the ceramic cover 1; the two static contacts 2 are respectively fixed to the top end of the ceramic cover 1 (i.e., the top wall) and the bottom end of the static contact 2 extends into the cavity 11; the moving reed 3 is installed at the upper end of the push rod component 4, and the two ends of the moving reed 3 are respectively matched with the bottom ends of the two static contacts 2, and the two ends of the moving reed 3 are provided with moving contacts, and the bottom end of the static contact 2 is provided with a static contact, and the moving contact of the moving reed 3 cooperates with the static contact of the static contact 2 to realize contact or separation of the contacts, and the lower end of the push rod component 4 passes through the yoke iron plate 5 and is connected to the magnetic circuit part below, specifically with the magnetic circuit part. The moving iron core 46 is connected; the insulating base 6 is mounted on the yoke iron plate 5, and the insulating base 6 includes a bottom plate 61 and a surrounding wall 62 protruding upward from the edge of the bottom plate; the bottom plate 61 is provided with a through hole 611 for the push rod component 4 to pass through; the through hole 611 is also extended with side holes 612 at the projection positions corresponding to the two ends of the moving spring 3, so that the push rod component 4 equipped with the moving spring 3 can completely pass through the insulating base 6, thereby realizing that the moving spring 3 is first installed in the magnetic circuit part and then installed in the insulating base 6 during assembly; in the bottom plate 61, the outer edge of the projection position corresponding to the two ends of the moving spring 3 is also protruding upward with a retaining wall 63 that can roughly approach the edge of the two ends of the moving spring, and the two retaining walls 63 are respectively in a half-wrapped shape to effectively prevent the arc spatter at the contact position from entering the push rod component 4.

[0028] In this embodiment, the push rod assembly 4 comprises a U-shaped basket 41, a fixed plate 42, a push rod 43, a spring 44, and a spring seat 45. The upper ends of the fixed plate 42 and the push rod 43 are integrally connected by injection molding, with the injection-molded portion forming the spring seat 45. The ends of the fixed plate 42 protrude beyond the spring seat 45. The bottom of the U-shaped basket 41 is fixed to the ends of the fixed plate 42. The spring 44 pushes the movable spring 3 toward the inner side of the top of the U-shaped basket 41. The upper end of the spring 44 abuts the bottom end of the movable spring 3, and the lower end of the spring 44 abuts the spring seat 45. The lower end of the push rod 43 is connected to the movable iron core 46 of the magnetic circuit. The through hole 611 of the bottom plate 61 of the insulating base 6 allows the push rod assembly 4 to pass through. The bottom plate 61 extends a side hole 612 from the through hole 611, allowing the push rod assembly 4, equipped with the movable spring 3, to fully pass through the insulating base 6. That is, the two ends of the movable spring 3 pass through the insulating base 6 via the side holes 612.

[0029] In this embodiment, the surrounding wall 62 of the insulating base 6 is in a half-enclosed shape corresponding to the outer side of the projection position of the two ends of the movable spring. The surrounding wall 62 is not provided on the entire edge of the insulating base 6, but is only provided on the outer side of the projection position corresponding to the two ends of the movable spring and is in a half-enclosed shape.

[0030] In this embodiment, the retaining wall 63 of the insulating base 6 is located within the surrounding wall 62 of the insulating base 6. The height of the retaining wall 63 of the insulating base is greater than the height of the surrounding wall 62 of the insulating base. An arc extinguishing groove is formed between the retaining wall 63 of the insulating base and the surrounding wall 62 of the insulating base.

[0031] In this embodiment, a grid structure 64 is further provided in the arc extinguishing trough, and the height of the grid structure 64 is substantially the same as the height of the surrounding wall 62 .

[0032] In this embodiment, the grid structure 64 is substantially arranged along the length direction of the dynamic spring 3 .

[0033] In this embodiment, the retaining wall 63 of the insulating base 6 is provided at the edge of the side hole 612 of the bottom plate 61 .

[0034] In this embodiment, the distance between the two end edges of the movable spring piece 3 is smaller than the distance between the outer edges of the two static contacts 2 .

[0035] In this embodiment, the upper portions of both end edges of the movable spring piece 3 are configured as arcs 31 , and the bottom portions of the outer edges of the two static contacts 2 are also configured as arcs 21 .

[0036] In this embodiment, a magnetic steel 13 is installed on the outside of the ceramic cover 1 to provide an arc extinguishing magnetic field. Figure 5 The arrow in the figure indicates the magnetic blowing direction of the arc extinguishing magnetic field.

[0037] In this embodiment, in the ceramic cover 1, at the position of the inner wall, limiting ribs 12 are respectively provided on both sides corresponding to the length direction of the movable spring piece 3 for limiting the displacement of the movable spring piece to both sides of the width during the up and down movement. The limiting ribs 12 protrude to the edge of the retaining wall 63 to block the arc, so that the arc is blocked in the arc extinguishing cavity 14 surrounded by the limiting ribs 12, the retaining wall 63, the inner wall of the ceramic cover (the top wall and side wall corresponding to the end position of the movable spring piece 3) and the insulating base (the base part corresponding to the end position of the movable spring piece 3).

[0038] A DC relay with an insulating base according to the present invention utilizes a through hole 611 of the bottom plate 61 of the insulating base 6, further extending side holes 612 at positions corresponding to the projections of the two ends of the movable spring. The large aperture formed by the through hole 611 and the side holes 612 allows the push rod component 4, equipped with the movable spring 3, to fully pass through the insulating base 6, thereby enabling the movable spring 3 to be first installed in the magnetic circuit portion and then in the insulating base 6 during assembly. The bottom plate 61 of the insulating base 6 also has upwardly projecting retaining walls 63 at the outer edges corresponding to the projections of the two ends of the movable spring 3, which can roughly approach the edges of the two ends of the movable spring 3. The two retaining walls 63 are each half-enclosed, effectively blocking arc spatter at the contact position from entering the push rod component 4. This structure of the present invention not only facilitates automated assembly and reduces the generation of plastic scraping, but also effectively prevents arc spatter from falling into the push rod component during operation, thereby affecting contact performance.

[0039] A DC relay with an insulating base of the present invention adopts a method in which the distance between the end edges of the movable spring piece 3 is designed to be smaller than the distance between the outer edges of the two static contacts 2, and the upper portions of the end edges of the movable spring piece 3 are designed to be arc-shaped, and the bottom portions of the outer edges of the two static contacts 3 are also designed to be arc-shaped, so that the arc generated between the movable and static contacts can be effectively guided into the arc extinguishing groove of the insulating base, thereby improving the arc extinguishing capability.

[0040] The present invention relates to a DC relay with an insulating base. A limiting rib 12 is provided on the inner side wall of a ceramic cover 1, corresponding to both sides of the length direction of the movable spring, for limiting the displacement of the movable spring toward both sides of the width during its up and down movement. The limiting rib 12 protrudes to the edge of the retaining wall 63 to block the arc, so that the arc is blocked in the arc extinguishing cavity 14 surrounded by the limiting rib, retaining wall, inner wall of the ceramic cover, and insulating base. The present invention utilizes the limiting rib on the inner side wall of the ceramic cover to block the arc, so that the arc is blocked in the arc extinguishing cavity surrounded by the limiting rib, retaining wall, inner wall of the ceramic cover, and insulating base, thereby preventing the arc from entering the central area and burning the candle push rod component.

[0041] 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 person skilled in the art can, without departing from the scope of the technical solution of the present invention, 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. Therefore, any simple modification, equivalent change and modification 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 DC relay with an insulating base, comprising a ceramic cover, a static contact, a moving spring, a push rod component, a yoke iron plate and an insulating base; the yoke iron plate is connected to the bottom end of the ceramic cover and forms a cavity with the ceramic cover; two static contacts are respectively fixed to the top of the ceramic cover and the bottom end of the static contact extends into the cavity; the moving spring is installed at the upper end of the push rod component, the two ends of the moving spring are respectively matched with the bottom ends of the two static contacts, and the lower end of the push rod component passes through the yoke iron plate and is connected to the magnetic circuit part below; the insulating base is installed on the yoke iron plate, and the insulating base includes a bottom plate and a surrounding wall protruding upward from the edge of the bottom plate; the bottom plate is provided with a through hole for the push rod component to pass through; it is characterized in that: The through hole is also extended with side holes at the projection positions corresponding to the two ends of the moving spring piece, so that the push rod component equipped with the moving spring piece can completely pass through the insulating base, so that the moving spring piece is first installed into the magnetic circuit part and then into the insulating base during assembly; in the bottom plate, the outer edge of the projection position corresponding to the two ends of the moving spring piece is also protruded upward to provide a retaining wall that can approach the edges of the two ends of the moving spring piece, and the two retaining walls are respectively in a half-wrapped shape to effectively prevent arc splashes at the contact position from entering the push rod component.

2. The DC relay with an insulating base according to claim 1, characterized in that: The surrounding wall of the insulating base is in a half-enclosed shape corresponding to the outer side of the projection position of the two ends of the movable spring piece, and the retaining wall of the insulating base is located within the surrounding wall of the insulating base.

3. The DC relay with an insulating base according to claim 2, characterized in that: The height of the retaining wall of the insulating base is greater than the height of the surrounding wall of the insulating base, and an arc extinguishing groove is formed between the retaining wall of the insulating base and the surrounding wall of the insulating base; a grid structure is also provided in the arc extinguishing groove, and the height of the grid structure is substantially the same as the height of the surrounding wall.

4. The DC relay with an insulating base according to claim 3, characterized in that: The grid structure is substantially arranged along the length direction of the movable spring.

5. The DC relay with an insulating base according to claim 2, characterized in that: The retaining wall of the insulating base is arranged at the edge of the side hole of the bottom plate.

6. The DC relay with an insulating base according to claim 1, characterized in that: The distance between the two end edges of the movable spring piece is smaller than the distance between the outer edges of the two stationary contacts.

7. The DC relay with an insulating base according to claim 6, characterized in that: The upper parts of the two end edges of the movable spring piece are set to be arc-shaped, and the bottoms of the outer edges of the two static contacts are also set to be arc-shaped.

8. The DC relay with an insulating base according to claim 1, characterized in that: In the ceramic cover, at the position of the inner wall, limiting ribs are provided on both sides corresponding to the length direction of the movable spring piece, which are used to limit the movable spring piece from deviating to both sides of the width during the up and down movement. The limiting ribs protrude to the edge of the retaining wall to block the arc, so that the arc is blocked in the arc extinguishing cavity surrounded by the limiting ribs, the retaining wall, the inner wall of the ceramic cover and the insulating base.

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