High-voltage DC relay with auxiliary contact

Abstract

This invention discloses a high-voltage DC relay with auxiliary contacts, comprising an inner support cover, a guide barrel, two stationary contacts, a moving contact, a push rod, and auxiliary contacts. The inner support cover is disposed on top of the guide barrel, and the two together form a first insulating chamber. The moving contact is located in the first insulating chamber and cooperates with the two stationary contacts to form the main contacts, and the moving contact is driven by the push rod. The auxiliary contacts are characterized by: a moving conductive element and two electrical leads; the inner support cover and the guide barrel further form a second insulating chamber located within the first insulating chamber; the bottom of the moving conductive element and the two electrical leads are located in the second insulating chamber; the moving conductive element is fixedly connected to the push rod through an insulating element, and as the push rod moves up and down, the moving conductive element contacts or separates from the two electrical leads; the side of the second insulating chamber has a clearance opening that allows the insulating element to move up and down. This invention solves the problems of easy failure, high cost, and complex assembly associated with using microswitches to construct auxiliary contact circuits.

Description

Technical Field

[0001] This invention relates to a high-voltage DC relay, and more particularly to a high-voltage DC relay with auxiliary contacts. Background Technology

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits and is essentially an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] Existing high-voltage DC relays typically employ a sealed structure, with two main sealing methods: ceramic sealing and epoxy sealing. Epoxy-sealed high-voltage DC relays seal the contact components, push rod components, and magnetic circuit components within a cavity enclosed by an inner support cover and an iron cup. Specifically, two stationary contacts are mounted on top of the inner support cover, with their bottoms contained within it. The inner support cover is placed on top of the iron cup, forming a cavity together. The moving spring, push rod components, and magnetic circuit components are then housed within the cavity. During sealing, the iron cup is inserted into the outer casing, and an adhesive layer (such as epoxy resin) is applied to the upper surface of the inner support cover to form a sealant layer. This seals the inner support cover, iron cup, and other components within the outer casing cavity, creating a sealed cavity.

[0004] Because epoxy-sealed high-voltage DC relays consist of an inner support cover and a guide barrel forming an insulating chamber, and both the inner support cover and the guide barrel are made of plastic, their arc-extinguishing performance is poor, especially in high-voltage (e.g., 1000V) environments. Furthermore, with increasing switching frequency, the arc generated when the moving and stationary contacts open gradually carbonizes the plastic components, reducing the insulation performance of the insulating chamber. Therefore, currently, the auxiliary contact circuit of epoxy-sealed high-voltage DC relays is located outside the insulating chamber and uses a microswitch to prevent the arc from hitting the auxiliary contact circuit. This places high demands on the microswitch. Additionally, microswitches are unstable and prone to failure, requiring additional components such as toggle blocks during assembly, complicating the assembly process. Moreover, the high price of microswitches increases costs. Summary of the Invention

[0005] This invention provides a high-voltage DC relay with auxiliary contacts, which overcomes the shortcomings of existing epoxy-sealed high-voltage DC relays that use microswitches to form the auxiliary contact circuit.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: a high-voltage DC relay with auxiliary contacts, including an inner support cover, a guide barrel, two stationary contacts, a moving contact piece, a push rod, and auxiliary contacts. The inner support cover is disposed on the top of the guide barrel, and the two together form a first insulating chamber. The moving contact piece is located in the first insulating chamber and cooperates with the two stationary contacts disposed in the inner support cover to form the main contacts. The moving contact piece is driven by the push rod. The auxiliary contacts include a moving conductive element and two electrical leads. The inner support cover and the guide barrel also form a second insulating chamber located in the first insulating chamber. The bottom of the moving conductive element and the two electrical leads are located in the second insulating chamber. The moving conductive element is fixedly connected to the push rod through an insulating element, and as the push rod moves up and down, the moving conductive element contacts or separates from the two electrical leads. The side of the second insulating chamber is provided with a clearance opening that allows the insulating element to move up and down.

[0007] Furthermore, the moving conductive component and the push rod are respectively fixed to the insulating component by insert injection molding.

[0008] Furthermore, a baffle extends from each of the opposite sides of the insulating member, the two baffles being located in the second insulating chamber and respectively engaging between the auxiliary contact and the clearance opening.

[0009] Furthermore, the guide barrel is provided with a surrounding wall of the second insulating chamber, and the side of the surrounding wall is provided with a notch. The inner support cover covers the top of the surrounding wall and forms the second insulating chamber with it. The inner support cover is provided with a downwardly extending baffle, which fits on the outside of the notch and forms the clearance opening with the notch.

[0010] Furthermore, the moving conductive element is in the shape of a "Z".

[0011] Furthermore, the moving conductive element is a movable spring that can elastically deform.

[0012] Furthermore, the two electrical leads are respectively mounted on the top of the inner support cover.

[0013] Furthermore, the guide barrel is provided with two cavities located on opposite sides of the moving contact piece, and each of the two cavities is equipped with a magnet, the polarities of the two magnets are distributed vertically and are opposite.

[0014] Furthermore, a bracket is provided on the insulating component, the movable contact piece is located in the bracket and can move up and down, and a contact spring is engaged between the movable contact piece and the insulating component.

[0015] Furthermore, the bracket includes two side plates and a limiting plate. The two side plates are arranged opposite to each other, and the bottom of the two side plates are respectively fixedly connected to the insulating member. The limiting plate is connected between the top of the two side plates. The movable contact plate is located below the limiting plate and is fitted between the two side plates.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention uses the moving conductive element and two electrical leads to replace the micro switch in forming the auxiliary contact, solving the problems of easy failure, high cost, and complex assembly that exist when using a micro switch to form the auxiliary contact circuit. Furthermore, the bottom of the moving conductive element and the two electrical leads are located in the second insulating chamber, and the moving conductive element is fixedly connected to the push rod through an insulating element. This avoids interference with the installation of the moving contact, push rod, auxiliary contact, and insulating element, while also leaving only space for the movement of the insulating element, forming a relatively closed second insulating chamber. The insulating element and the second insulating chamber can be used to separate the auxiliary contact from the main contact, thereby preventing the electric arc generated by the main contact from hitting the auxiliary contact.

[0018] 2. The moving conductive component and the push rod are fixed together with the insulating component by insert injection molding, which not only increases the creepage distance between the auxiliary contact and the main contact formed by the moving contact and the two stationary contacts, but also ensures the consistency between the auxiliary contact and the main contact.

[0019] 3. A baffle extends from each of the opposite sides of the insulating component. The two baffles are located in the insulating chamber and are respectively engaged between the auxiliary contact and the clearance opening, so that the present invention can use the baffles to isolate the auxiliary contact and the main contact, thereby further increasing the creepage distance between the auxiliary contact and the main contact.

[0020] 4. The guide barrel is provided with a surrounding wall of the second insulating chamber. The side of the surrounding wall has a notch. The inner support cover covers the top of the surrounding wall and forms the second insulating chamber. The inner support cover is provided with a downwardly extending baffle. The baffle fits on the outside of the notch and forms the clearance opening with the notch. This not only makes the assembly of the auxiliary contact, insulating component, and push rod very convenient, but also uses the baffle to isolate the insulating component and the main contact, thereby protecting the insulating component and further increasing the creepage distance between the auxiliary contact and the main contact.

[0021] 5. The moving conductive element is a movable spring that can be elastically deformed, which enables the auxiliary contact of the present invention to achieve overtravel and ensures reliable contact between the movable spring and the two electrical leads.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the high-voltage DC relay with auxiliary contacts of the present invention is not limited to the embodiments. Attached Figure Description

[0023] Figure 1 This is a longitudinal sectional view of the present invention. Figure 1 ;

[0024] Figure 2 This is a longitudinal sectional view of the present invention. Figure 2 ;

[0025] Figure 3 This is a cross-sectional view of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the present invention, which combines the insulating component, the movable spring, the movable contact, etc.

[0027] Figure 5 This is a schematic diagram of the structure of the insulating component of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the movable spring of the present invention;

[0029] Figure 7 This is a schematic diagram showing the cooperation of the insulating component, moving spring, moving contact piece, and two lead-out pieces of the present invention;

[0030] Figure 8 This is a schematic diagram of the guide barrel of the present invention;

[0031] Figure 9 This is a cross-sectional view of the guide barrel and inner support cover of the present invention in a mating state;

[0032] Figure 10 This is a schematic diagram of the structure of the guide barrel of the present invention after assembling auxiliary contacts and other components. Detailed Implementation

[0033] For an example, please refer to [link / reference]. Figures 1-10 As shown, a high-voltage DC relay with auxiliary contacts according to the present invention includes a housing assembly, an inner support cover 10, a guide barrel 11, two stationary contacts 1, a moving contact 2, a push rod 5, a moving iron core 6, a coil assembly 7, and auxiliary contacts. The inner support cover 10 is disposed on top of the guide barrel 11, and the two together form a first insulating chamber 16. The moving contact 2 is located in the first insulating chamber 16 and cooperates with the two stationary contacts 1 disposed in the inner support cover 10 to form the main contacts, and the moving contact 2 is driven by the push rod 5. The moving iron core 6 is movably disposed in the coil assembly 7 and is fixedly connected to the push rod 5. The auxiliary contacts include a moving conductive element and two electrical leads. The inner support cover 10 and the guide barrel 11 also form a second insulating chamber 9 located within the first insulating chamber 16. The bottom of the moving conductive element and the two electrical leads are located in the second insulating chamber 9. The moving conductive element is fixedly connected to the push rod 5 through an insulating element 4. Specifically, two electrical leads are respectively mounted on the top of the inner support cover 10, with the tops of the two electrical leads located outside the inner support cover 10 and the bottoms of the two electrical leads located inside the second insulating chamber 9 to cooperate with the moving conductive element. As the push rod 5 moves up and down, the moving conductive element contacts or separates from the two electrical leads, thereby realizing the switching on and off of the auxiliary contacts. The side of the insulating chamber 9 is provided with a clearance opening 91 to allow the insulating element 4 to move up and down.

[0034] In this embodiment, the movable conductive element and the push rod 5 are fixed to the insulating element 4 by insert injection molding. Specifically, the movable conductive element is a resiliently deformable movable spring 8, enabling the auxiliary contact of the present invention to achieve overtravel and ensuring reliable contact between the movable spring 8 and the two electrical leads. Figure 4 As shown, the insulating component 4 includes a plate 41 and a column 42 located on the side of the plate. The top of the push rod 5 is injection molded into the plate 41. The movable spring 8 is roughly Z-shaped, such as... Figure 5 As shown, the top of the movable spring 8 is injection molded together with the column 42 of the insulating member 4, and the two sides of the movable spring 8 are located on opposite sides of the column 42. The shape of the movable spring is not limited to this; in other embodiments, the movable spring is in the shape of a straight line, etc. The electrical lead-out portion is specifically a lead-out piece 18 extending in the vertical direction, and is located on opposite ends of the movable conductive member (i.e., the movable spring 8), such as... Figure 7 As shown.

[0035] In this embodiment, a baffle 43 extends from each of the opposite sides of the insulating member 4. These two baffles 43 are located in the second insulating chamber 9 and respectively engage between the auxiliary contact and the clearance opening 91. Specifically, the two baffles 43 are located on opposite sides of the cylindrical body of the insulating member 4 and correspond one-to-one with the two sides of the movable spring 8, as shown below. Figure 4 As shown.

[0036] In this embodiment, a bracket 15 is provided on the insulating member 4, and the movable contact piece 2 is located in the bracket 15 and can move up and down. A contact spring 3 is provided between the movable contact piece 2 and the insulating member 4. Figure 4 As shown. The bracket 15 includes two side pieces 151 and a limiting piece 152. The two side pieces 151 are arranged opposite to each other, and the bottom of the two side pieces 151 are respectively fixedly connected to the insulating member 4. The limiting piece 152 is connected between the top of the two side pieces 151. The movable contact piece 2 is located below the limiting piece 152 and is fitted between the two side pieces 151.

[0037] In this embodiment, the guide barrel 11 is provided with a surrounding wall 111 of the second insulating chamber, and the side of the surrounding wall 111 is provided with a notch 112, such as Figure 7 As shown; the inner support cover 10 covers the top of the enclosure 111, forming the second insulating chamber 9. The inner support cover 10 is provided with a downwardly extending baffle 101, which fits on the outside of the notch 111 and forms the clearance opening 91 between the baffle 101 and the notch 112, as shown. Figure 8 As shown. The guide barrel 11 has two cavities 113, which are located on opposite sides of the moving contact piece 2, and each of the two cavities 113 is equipped with a magnet 17, as shown. Figure 2As shown, the polarities of the two magnets 17 are distributed vertically and are opposite. Specifically, the S pole of one magnet is on top and the N pole is on the bottom, while the S pole of the other magnet is on the bottom and the N pole is on top.

[0038] In this embodiment, the housing assembly includes an outer shell 12 and a fixing ring 13. The fixing ring 13 is fixed to the top of the outer shell 12, and an iron cup 14 is fitted inside the outer shell 12. The tops of the two stationary contacts 1 extend upwards beyond the fixing ring 13. The inner support cover 10, the guide barrel 11, and the coil assembly 7 are located inside the iron cup 14.

[0039] This invention discloses a high-voltage DC relay with auxiliary contacts, which is an epoxy-sealed high-voltage DC relay. When assembling the auxiliary contacts, the moving assembly consisting of the moving spring 8, the insulating component 4, the push rod 5, the contact spring 3, the bracket 15, and the moving contact 2 is first placed into the guide barrel 11, and the column 43 of the moving spring 8 and the insulating component 4 is positioned within the enclosure 111. Figure 9 As shown, the inner support cover 10 is then placed on the guide barrel 11, so that the inner support cover 10 and the guide barrel 11 cooperate with each other to form the first insulation chamber 16 and the second insulation chamber 9.

[0040] This invention discloses a high-voltage DC relay with auxiliary contacts. The auxiliary contacts are constructed using a moving conductive element (i.e., a moving spring 8) and two electrical leads (i.e., lead-out pieces 18) instead of a microswitch, solving the problems of easy failure, high cost, and complex assembly associated with using microswitches to construct auxiliary contact circuits. Furthermore, this invention avoids interference with the installation of the moving contact, push rod, auxiliary contacts, and insulating elements, while preserving space for the movement of the insulating elements. It also utilizes the insulating elements and a second insulating chamber to separate the auxiliary contacts from the main contacts, preventing the arc generated by the main contacts from striking the auxiliary contacts.

[0041] The above embodiments are only used to further illustrate a high-voltage DC relay with auxiliary contacts according to the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A high-voltage DC relay with auxiliary contacts, comprising an inner support cover, a guide barrel, two stationary contacts, a moving contact, a push rod, and auxiliary contacts, wherein the inner support cover is disposed on top of the guide barrel, and the two together form a first insulating chamber, the moving contact is located in the first insulating chamber, and cooperates with the two stationary contacts disposed on the inner support cover to form the main contacts, and the moving contact is driven by the push rod; characterized in that: The auxiliary contact includes a movable conductive part and two electrical lead-out parts. The inner support cover and the guide barrel also enclose a second insulating chamber located in the first insulating chamber, and the bottom of the movable conductive part and the two electrical lead-out parts is located in the second insulating chamber; the movable conductive part is fixedly connected to the push rod through an insulating part, and as the push rod moves up and down, the movable conductive part contacts or separates from the two electrical lead-out parts; a relief opening allowing the insulating part to move up and down is provided on the side of the second insulating chamber; The insulating part includes a plate body and a column located on the side of the plate body. The push rod is fixed to the plate body, the plate body is located in the first insulating chamber, the movable conductive part is fixed to the column, the column is located in the second insulating chamber, and the part between the bottom of the column and the plate body is fitted in the relief opening; a retaining piece is provided on the side of the column, and the retaining piece is located in the second insulating chamber and is fitted between the auxiliary contact and the relief opening to isolate between the auxiliary contact and the main contact.

2. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The movable conductive part and the push rod are respectively fixed to the insulating part by insert molding.

3. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The retaining pieces are respectively provided on two opposite sides of the column.

4. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The guide barrel has surrounding walls on four sides of the second insulating chamber, a notch is provided on the side of the surrounding walls, the inner support cover covers the top of the surrounding walls and encloses the second insulating chamber with them, and the inner support cover has a baffle extending downward, and the baffle is fitted outside the notch and encloses the relief opening with the notch.

5. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The movable conductive part is in a shape of "ji".

6. The high-voltage DC relay with auxiliary contacts according to claim 1 or 5, characterized in that: The movable conductive part is an elastically deformable movable reed.

7. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The two electrical lead-out parts are respectively installed on the top of the inner support cover.

8. The high-voltage DC relay with auxiliary contacts according to claim 1, characterized in that: The guide barrel has two cavities, the two cavities are located on two opposite sides of the movable contact piece, and a magnet is respectively installed in each of the two cavities. The polarities of the two magnets are distributed up and down, and the polarities of the two magnets are opposite.

9. The high-voltage DC relay with auxiliary contacts according to claim 1 or 2, characterized in that: A bracket is provided on the insulating part, the movable contact piece is located in the bracket and can move up and down, and a contact spring is fitted between the movable contact piece and the insulating part.

10. The high-voltage DC relay with auxiliary contacts according to claim 9, characterized in that: The bracket includes two side pieces and a limiting piece. The two side pieces are arranged oppositely, and the bottom parts of the two side pieces are respectively fixedly connected to the insulating part. A limiting piece is connected between the tops of the two side pieces. The movable contact piece is located below the limiting piece and is fitted between the two side pieces.

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