High-voltage direct-current relay with double-moving-contact structure
By adopting a double-moving contact plate structure and parallel design in the output circuit of the high-voltage DC relay, the problems of large contact resistance and weak short-circuit resistance caused by the single-contact structure are solved, and smaller contact resistance and stronger short-circuit resistance are achieved. Current capability.
Patent Information
- Application Number
- CN202420424205.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-05
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-03-05
AI Technical Summary
The output circuit of existing high-voltage DC relays adopts a single-contact structure design, resulting in a small contact area, large contact resistance, and weak resistance to short circuit current.
The double-moving contact plate structure design is adopted, including the active contact plate and the driven contact plate. The two are designed in parallel, and a lower short-circuit ring is set on the contact plate to increase the contact area and anti-short circuit capability.
It effectively reduces contact resistance, improves current carrying capacity, and enhances the ability to resist short circuit current, making the relay have the advantages of simple structure and stable and reliable performance.
Smart Images
Figure CN222440486U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of relays, in particular to a high-voltage direct current relay with a double-moving contact piece structure. Background Art
[0002] As an electronic control device, the relay uses electricity, light, magnetism, heat, etc. (i.e. input quantity) as the medium (tool), and transmits and controls the circuit or signal (i.e. output quantity). It has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). The two circuits are coupled through internal mechanical or electronic devices to achieve the linkage of the two circuit states. Relays are usually used in automatic control circuits. It is equivalent to an "automatic switch" and plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit. With the rapid development of the new energy industry, high-voltage DC relays are widely used in new energy vehicles and charging supporting equipment, photovoltaic / wind power generation systems, engineering vehicles, UPS and other fields. In the output circuit of the relay, the contact resistance of the contact point accounts for about 70% of the entire circuit. The output circuit of the existing high-voltage DC relay adopts a single-contact structure design, the contact area between the moving contact and the static contact is small, the contact resistance is large, and when the single contact passes a large current, the electric repulsion is large, the tolerance is weak, and the short-circuit current resistance is weak. Summary of the invention
[0003] The utility model aims to overcome the defects of the prior art and provide a high voltage DC relay with a double-acting contact structure which has a simple structure, stable and reliable performance, small contact resistance and strong short-circuit current resistance.
[0004] To achieve the above-mentioned purpose, the utility model adopts a high-voltage DC relay with a double moving contact structure, including a shell with a sealed chamber, an electromagnetic drive mechanism arranged in the sealed chamber, a ceramic cover arranged on the electromagnetic drive mechanism, two lead terminals arranged on the ceramic cover, and a moving contact assembly arranged in the ceramic cover and matched with the two lead terminals. The moving contact assembly includes an active frame, an active contact arranged on the active frame in linkage, an active contact spring arranged between the active contact and a push rod of the electromagnetic drive mechanism, a driven contact movably arranged in a receiving hole of the active contact, a driven contact spring arranged between the driven contact and the push rod of the electromagnetic drive mechanism, and a lower short-circuit ring coordinated with the push rod of the electromagnetic drive mechanism. The lower short-circuit ring is arranged on the active contact and the driven contact, and constitutes the linkage cooperation of the active contact, the driven contact and the lower short-circuit ring. The two lead terminals have two circular static contact planes extending in the ceramic cover, and the two ends of the active contact have two active contact planes matched with the two circular static contact planes, and the two ends of the driven contact have two driven contact planes matched with the two circular static contact planes.
[0005] The beneficial effects of the above structure are: the moving contact piece assembly adopts a double moving contact piece structure design, and the lower short-circuit ring is set on the active contact piece and the driven contact piece, so that the active contact piece and the driven contact piece can be connected in parallel, and the active piece and the driven contact piece adopt a flat-laying and splicing structure design, which can effectively increase the contact area between the active piece and the driven contact piece and the two lead-out terminals, and the active contact plane of the active contact piece and the driven contact plane of the driven contact piece are in contact with the two driven contact planes of the two lead-out terminals. The active contact piece and the driven contact piece are in plane contact with the two lead-out terminals, which can effectively increase the contact area between the driven contact piece and the two lead-out terminals, and the contact resistance is smaller, which improves the current carrying capacity of the product. The active contact piece and the driven contact piece are designed in parallel. When a short-circuit current occurs, the active contact piece and the driven contact piece can shunt the current, and the electric repulsion is smaller, which is conducive to improving the ability to resist short-circuit current. Therefore, the high-voltage DC relay has the advantages of simple structure, stable and reliable performance, small contact resistance, and strong ability to resist short-circuit current.
[0006] In particular, the spacing between the two active contact planes and the two circular static contact planes is smaller than the spacing between the two driven contact planes and the two circular static contact planes. When closing the switch, the active contact plane of the active contact piece is first connected to the two lead-out terminals, and the driven contact plane of the driven contact piece is then connected to the two lead-out terminals; when opening the switch, the active contact plane of the active contact piece is first disconnected from the two lead-out terminals, and the driven contact plane of the driven contact piece is then disconnected from the two lead-out terminals. The active contact piece and the driven contact piece can move independently without affecting each other, and can contact the two lead-out terminals respectively. During use, good contact can be maintained, and the wear of any active contact piece or driven contact piece or manufacturing error will not cause the phenomenon of poor contact between the moving contact piece assembly and the two lead-out terminals, thereby improving the reliability of product use.
[0007] In particular, the active frame has two symmetrically distributed support arms, the active contacts are arranged on the two support arms, and the two support arms are provided with plugs that match the active contacts, the active contacts are provided with slots that match the plugs, the plugs are inserted into the slots, and the plugs are engaged with the active contacts. The active contacts are engaged with the two support arms of the active frame, so that the assembly of the active contacts and the active frame is facilitated, the assembly efficiency is higher, and it can be ensured that the active frame can reliably drive the active contacts to move, which is conducive to improving the working reliability of the high-voltage DC relay.
[0008] In particular, two driving arms are provided on the push rod at the two ends corresponding to the lower short-circuit ring, and the two driving arms are provided with clamping holes matched with the lower short-circuit ring, and the two ends of the lower short-circuit ring are clamped in the clamping holes of the two driving arms, and the two driving arms and the lower short-circuit ring are clamped together. The push rod drives the lower short-circuit ring to move through the two driving arms, thereby ensuring that the push rod can drive the lower short-circuit ring to move stably and reliably, and the two driving arms are connected to the lower short-circuit ring in a clamping manner, thereby facilitating the assembly of the push rod and the lower short-circuit ring, and the assembly efficiency is higher.
[0009] In particular, a positioning groove is provided on the push rod corresponding to the active contact spring, one end of the active contact spring abuts in the positioning groove, a limiting groove matching the active contact spring is provided on the active frame, and the other end of the active contact spring is engaged in the limiting groove. The active contact spring can increase the contact pressure between the active contact piece and the two lead-out terminals, thereby effectively reducing the contact resistance, and the active contact spring is engaged in the positioning groove of the push rod and the limiting groove of the active contact piece, so that the active contact spring can reliably drive the active contact piece, which can ensure the stable and reliable contact between the active contact piece and the two lead-out terminals.
[0010] In particular, the push rod is provided with a positioning boss matched with the driven contact spring, one end of the driven contact spring is engaged with the positioning boss, the active frame is provided with a through hole for the driven contact spring to pass through, the driven contact piece is provided with a limiting boss matched with the driven contact spring, and the other end of the driven contact spring passes through the active contact spring and the through hole of the active frame in sequence and is engaged with the limiting boss. The driven contact spring can increase the contact pressure between the driven contact piece and the two lead-out terminals, thereby effectively reducing the contact resistance, and the driven contact spring is engaged with the positioning boss of the push rod and the limiting boss of the driven contact piece, so that the driven contact spring can reliably drive the driven contact piece, and can ensure the stable and reliable contact between the driven contact piece and the two lead-out terminals. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a cross-sectional view of an embodiment of the utility model.
[0012] Figure 2 This is an exploded view of an embodiment of the utility model.
[0013] Figure 3 This is an internal structure diagram of an embodiment of the utility model.
[0014] Figure 4 This is an assembly diagram of the short-circuit ring, the active contact piece, and the driven contact piece according to an embodiment of the utility model.
[0015] Figure 5 This is an assembly diagram of the active frame, active contact piece, and driven contact piece according to an embodiment of the utility model. DETAILED DESCRIPTION
[0016] like Figures 1 to 5As shown, the embodiment of the utility model is a high-voltage DC relay with a double moving contact structure, including a housing 10 with a sealed chamber 100, an electromagnetic drive mechanism 11 arranged in the sealed chamber 100, a ceramic cover 12 arranged on the electromagnetic drive mechanism 11, two lead terminals 13 arranged on the ceramic cover 12, and a moving contact assembly 20 arranged in the ceramic cover 12 and matched with the two lead terminals 13, wherein the moving contact assembly 20 includes an active frame 21, an active contact 22 linked to the active frame 21, an active contact spring 23 arranged between the active contact 22 and a push rod 111 of the electromagnetic drive mechanism 11, a driven contact 24 movably arranged in a receiving hole 221 of the active contact 22, and a moving contact assembly 20 arranged in the ceramic cover 12 and matched with the two lead terminals 13. The driven contact spring 25 between the driven contact piece 24 and the push rod 11 of the electromagnetic drive mechanism 11, and the lower short-circuit ring 26 that cooperates with the push rod 111 of the electromagnetic drive mechanism 11, the lower short-circuit ring 26 is arranged on the active contact piece 22 and the driven contact piece 24, and constitutes the linkage cooperation of the active contact piece 22, the driven contact piece 24 and the lower short-circuit ring 26, the two lead terminals 13 have two circular static contact planes 131 extending in the ceramic cover 12, the two ends of the active contact piece 22 have two active contact planes 222 that cooperate with the two circular static contact planes 131, and the two ends of the driven contact piece 24 have two driven contact planes 241 that cooperate with the two circular static contact planes 131. The distance between the two active contact planes 222 and the two circular static contact planes 131 is smaller than the distance between the two driven contact planes 241 and the two circular static contact planes 131. When closing the circuit, the active contact plane of the active contact piece is first connected to the two lead-out terminals, and the driven contact plane of the driven contact piece is then connected to the two lead-out terminals; when opening the circuit, the active contact plane of the active contact piece is first disconnected from the two lead-out terminals, and the driven contact plane of the driven contact piece is then disconnected from the two lead-out terminals. The active contact piece and the driven contact piece can move independently without affecting each other, and can contact the two lead-out terminals respectively. During use, good contact can be maintained, and the wear of any active contact piece or driven contact piece or manufacturing error will not cause poor contact between the moving contact piece assembly and the two lead-out terminals, thereby improving the reliability of product use. The active frame 21 has two symmetrically distributed support arms 211, the active contact pieces 22 are arranged on the two support arms 211, and the two support arms 211 are provided with plug pieces 2111 that match the active contact pieces 22, the active contact pieces 22 are provided with slots 223 that match the plug pieces 2111, the plug pieces 2111 are inserted into the slots 223, and form a snap-fit fit between the plug pieces 2111 and the active contact pieces 22. The active contact pieces are snap-fitted on the two support arms of the active frame, so as to facilitate the assembly of the active contact pieces and the active frame, and the assembly efficiency is higher, and it can ensure that the active frame can reliably drive the active contact pieces to move, which is conducive to improving the working reliability of the high-voltage DC relay.
[0017] like Figure 3 As shown, two driving arms 1111 are provided on the push rod 111 at the two ends of the corresponding lower short-circuit ring 26, and the two driving arms 1111 are provided with clamping holes 1110 matched with the lower short-circuit ring 26. The two ends of the lower short-circuit ring 26 are clamped in the clamping holes 1110 of the two driving arms 1111, and the two driving arms 1111 are clamped with the lower short-circuit ring 26. The push rod drives the lower short-circuit ring to move through the two driving arms, thereby ensuring that the push rod can drive the lower short-circuit ring to move stably and reliably, and the two driving arms are connected to the lower short-circuit ring in a clamping manner, thereby facilitating the assembly of the push rod and the lower short-circuit ring, and the assembly efficiency is higher.
[0018] like Figure 1 , 3 As shown in Figures 4 and 5, a positioning groove 1112 is provided on the push rod 111 corresponding to the active contact spring 23, one end of the active contact spring 23 abuts in the positioning groove 1112, and a limiting groove 212 matching the active contact spring 23 is provided on the active frame 21, and the other end of the active contact spring 23 is engaged in the limiting groove 212. The active contact spring can increase the contact pressure between the active contact piece and the two lead-out terminals, thereby effectively reducing the contact resistance, and the active contact spring is engaged in the positioning groove of the push rod and the limiting groove of the active contact piece, so that the active contact spring can reliably drive the active contact piece, which can ensure the stable and reliable contact between the active contact piece and the two lead-out terminals. The push rod 111 is provided with a positioning boss 1113 matched with the driven contact spring 25, one end of the driven contact spring 25 is engaged with the positioning boss 1113, the active frame 21 is provided with a through hole 213 for the driven contact spring 25 to pass through, and the driven contact piece 24 is provided with a limiting boss 242 matched with the driven contact spring 25, and the other end of the driven contact spring 25 passes through the active contact spring 23 and the through hole 213 of the active frame 21 in sequence and is engaged with the limiting boss 242. The driven contact spring can increase the contact pressure between the driven contact piece and the two lead-out terminals, thereby effectively reducing the contact resistance, and the driven contact spring is engaged with the positioning boss of the push rod and the limiting boss of the driven contact piece, so that the driven contact spring can reliably drive the driven contact piece, and can ensure that the driven contact piece is in stable and reliable contact with the two lead-out terminals.
[0019] The moving contact piece assembly adopts a double moving contact piece structure design, and the lower short-circuit ring is set on the active contact piece and the driven contact piece, so that the active contact piece and the driven contact piece can be connected in parallel, and the active piece and the driven contact piece adopt a flat-laying and splicing structure design, which can effectively increase the contact area between the active piece and the driven contact piece and the two lead-out terminals, and the active contact plane of the active contact piece and the driven contact plane of the driven contact piece are in contact with the two driven contact planes of the two lead-out terminals. The active contact piece and the driven contact piece are in plane contact with the two lead-out terminals, which can effectively increase the contact area between the driven contact piece and the two lead-out terminals, and the contact resistance is smaller, which improves the current carrying capacity of the product. The active contact piece and the driven contact piece are designed in parallel. When a short-circuit current occurs, the active contact piece and the driven contact piece can shunt the current, and the electric repulsion is smaller, which is conducive to improving the ability to resist short-circuit current. Therefore, the high-voltage DC relay has the advantages of simple structure, stable and reliable performance, small contact resistance, and strong ability to resist short-circuit current.
[0020] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with the field can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the utility model without departing from the scope of the technical solution of the utility model, 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 utility model without departing from the content of the technical solution of the utility model should fall within the scope of protection of the technical solution of the utility model.
Claims
1. A high voltage DC relay with a double moving contact structure, comprising a housing having a sealed chamber, an electromagnetic drive mechanism disposed in the sealed chamber, a ceramic cover disposed on the electromagnetic drive mechanism, two lead terminals disposed on the ceramic cover, and a moving contact assembly disposed in the ceramic cover and matched with the two lead terminals, characterized in that: The moving contact piece assembly includes an active frame, an active contact piece linked to the active frame, an active contact spring arranged between the active contact piece and a push rod of an electromagnetic drive mechanism, a driven contact piece movably arranged in a receiving hole of the active contact piece, a driven contact spring arranged between the driven contact piece and the push rod of the electromagnetic drive mechanism, and a lower short-circuit ring linked to the push rod of the electromagnetic drive mechanism. The lower short-circuit ring is arranged on the active contact piece and the driven contact piece, and constitutes a linkage cooperation between the active contact piece, the driven contact piece and the lower short-circuit ring. The two lead-out terminals have two circular static contact planes extending in the ceramic cover, the two ends of the active contact piece have two active contact planes matched with the two circular static contact planes, and the two ends of the driven contact piece have two driven contact planes matched with the two circular static contact planes.
2. The high voltage DC relay with double moving contact structure according to claim 1, characterized in that: The distance between the two active contact planes and the two circular static contact planes is smaller than the distance between the two passive contact planes and the two circular static contact planes.
3. The high voltage DC relay with double moving contact structure according to claim 1 or 2, characterized in that: The active frame has two symmetrically distributed support arms, the active contact pieces are arranged on the two support arms, and the two support arms are provided with plug-ins that match the active contact pieces, the active contact pieces are provided with slots that match the plug-ins, the plug-ins are inserted into the slots, and a snap-fit fit between the plug-ins and the active contact pieces is formed.
4. The high voltage DC relay with double moving contact structure according to claim 1 or 2, characterized in that: Two driving arms are arranged on the push rod at the two ends corresponding to the lower short-circuit ring, and the two driving arms are provided with clamping holes matching with the lower short-circuit ring. The two ends of the lower short-circuit ring are clamped in the clamping holes of the two driving arms, and the two driving arms are clamped with the lower short-circuit ring.
5. The high voltage DC relay with double moving contact structure according to claim 1 or 2, characterized in that: A positioning groove is arranged on the push rod corresponding to the active contact spring, one end of the active contact spring abuts in the positioning groove, a limiting groove matching with the active contact spring is arranged on the active frame, and the other end of the active contact spring is engaged in the limiting groove.
6. The high voltage DC relay with double moving contact structure according to claim 1 or 2, characterized in that: The push rod is provided with a positioning boss that matches the driven contact spring, one end of the driven contact spring is clamped on the positioning boss, the active frame is provided with a through hole for the driven contact spring to pass through, the driven contact piece is provided with a limiting boss that matches the driven contact spring, and the other end of the driven contact spring passes through the through holes of the active contact spring and the active frame in sequence and is clamped on the limiting boss.