Ceramic cover of direct current contactor
By introducing a guide slide frame and slot structure into the DC contactor, the problem of contact offset caused by vibration is solved, a more stable electrical connection is achieved, and the reliability and service life of the equipment are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JUEN ELECTRIC (SHANGHAI) CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-05
AI Technical Summary
In vibration scenarios, the conductor bars and electrode terminals of DC contactors are prone to contact misalignment due to mechanical vibration, resulting in poor contact.
The middle connecting substrate moves along the inner connecting slide bar via a guide slide bracket. Combined with the design of the side locking strip and the lower locking groove, the movement direction of the middle connecting substrate is restricted, and a tight fit is achieved through spring preload, ensuring stable contact between the upper electrode terminal and the middle connecting substrate.
It effectively reduces contact offset caused by mechanical vibration, improves contact stability, reduces poor contact, and enhances the reliability and service life of the equipment.
Smart Images
Figure CN224204044U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of DC contactor technology, and in particular to a ceramic cover for a DC contactor. Background Technology
[0002] The ceramic cover is a component of a DC contactor. It is an insulating assembly made of alumina or zirconia ceramic. The ceramic cover is used to extinguish electric arcs and prevent high-voltage breakdown, ensuring the safe operation of the equipment.
[0003] Two electrode terminals are set on the top of the ceramic cover. The on / off function is achieved by the conductor strip inside the ceramic cover contacting or moving away from the electrode terminals. The conductor strip moves up and down by the central cylinder. In the case of vibration, the up and down movement of the conductor will also cause back and forth swinging. Vibration will cause the conductor strip to deviate when it contacts the electrode terminals, resulting in poor contact. Summary of the Invention
[0004] This utility model provides a ceramic cover for a DC contactor. The middle connecting substrate moves closer to or further away from the upper electrode terminal via a guide sliding bracket along the inner connecting slide. The inner connecting slide restricts the movement direction of the middle connecting substrate, effectively reducing contact offset and poor contact caused by mechanical vibration. When the upper electrode terminal and the middle connecting substrate are in contact, the side retaining strip and the lower retaining groove remain engaged simultaneously. The fixed position between the upper electrode terminal and the middle connecting substrate makes the contact connection between the upper electrode terminal and the middle connecting substrate more stable.
[0005] This utility model provides a ceramic cover for a DC contactor, specifically including an outer ceramic cover, a middle connecting base plate, and a lifting rod. The middle connecting base plate is disposed inside the outer ceramic cover, and the lifting rod is slidably connected through the bottom of the outer ceramic cover. An inner connecting slide is fixedly connected inside the outer ceramic cover, and upper electrode terminals are fixedly connected to both sides of the top of the outer ceramic cover. The upper electrode terminals are made of silver-plated copper alloy, and a lower slot is opened at the bottom of the upper electrode terminals.
[0006] Furthermore, the upper end of the upper electrode terminal extends to the outer side of the top of the outer ceramic cover, the lower end of the upper electrode terminal extends into the interior of the outer ceramic cover, and the lower slot is located inside the outer ceramic cover.
[0007] Furthermore, side clips are fixedly arranged in an array at intervals at both ends of the central connecting substrate, and an upper connecting tension spring is fixedly connected to the upper part of the side clips. Guide sliding frames are fixedly connected to both sides of the middle part of the central connecting substrate.
[0008] Furthermore, the tail end of the upper connecting spring is fixedly connected to the middle connecting base plate, and the guide sliding frame and the inner connecting slide are slidably connected.
[0009] Furthermore, the upper part of the lifting rod is slidably connected to an upper connecting slide column, and the top of the upper connecting slide column is fixedly connected to an upper support spring. The bottom of the lifting rod is connected to the telescopic rod of an electromagnet. The precise displacement control of the lifting rod is achieved by the movement of the telescopic rod of the electromagnet. When the lifting rod moves upward under the support of the electromagnet, the upper connecting slide column and the upper support spring drive the middle connecting base plate to move upward along the inner connecting slide bar. When the side clip approaches the lower slot of the upper electrode terminal, under the action of the spring preload, the wedge block at the upper end of the side clip slides into the lower slot, realizing the tight fit and electrical connection between the middle connecting base plate and the upper electrode terminal. The wedge block at the upper end of the side clip has an angle of 45°, and the inner wall of the lower slot is correspondingly set with a 45° oblique angle.
[0010] Furthermore, the upper end of the upper connecting slide is fixedly connected to the middle connecting base plate, the upper end of the upper support spring is fixedly connected to the middle connecting base plate, the upper support spring provides support for the middle connecting base plate, and the upper support spring presses against the middle connecting base plate and the upper electrode terminal to maintain a tight fit.
[0011] Furthermore, when the top of the middle connecting substrate and the lower end of the upper electrode terminal are in a fitted state, the upper end of the side clip is engaged inside the lower clip groove, and the wedge-shaped block at the upper end of the side clip and the lower clip groove are slidably engaged and connected, thus fixing the position between the upper electrode terminal and the middle connecting substrate.
[0012] This utility model provides a ceramic cover for a DC contactor, which has the following beneficial effects:
[0013] The intermediate connecting substrate moves closer to or further away from the upper electrode terminal via a guide slide along the inner connecting slide. The inner connecting slide restricts the movement direction of the intermediate connecting substrate, effectively reducing contact offset caused by mechanical vibration and poor contact caused by the back-and-forth movement of the intermediate connecting substrate.
[0014] When the upper electrode terminal and the middle connecting substrate are bonded together, the side retainer and the lower retainer remain engaged simultaneously. The fixed position between the upper electrode terminal and the middle connecting substrate makes the contact and communication between the upper electrode terminal and the middle connecting substrate more stable, further reducing the possibility of poor contact. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.
[0016] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.
[0017] In the attached diagram:
[0018] Figure 1 A schematic diagram of the overall structure of this application is shown;
[0019] Figure 2A schematic diagram of the half-section structure of the outer ceramic cover of this application is shown;
[0020] Figure 3 A schematic diagram of the outer ceramic cover structure of this application is shown;
[0021] Figure 4 A schematic diagram of the interconnect substrate structure in this application is shown;
[0022] Figure 5 A schematic diagram of the lifting rod of this application is shown;
[0023] Figure 6 A schematic diagram of the structure in the split state of this application is shown;
[0024] Figure label:
[0025] 1. Outer ceramic cover; 101. Inner connecting slide bar; 102. Upper electrode terminal; 103. Lower slot;
[0026] 2. Middle connecting base plate; 201. Side retaining strip; 202. Upper connecting tension spring; 203. Guide sliding frame;
[0027] 3. Lifting rod; 301. Upper connecting slide column; 302. Upper support spring. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0029] Example 1: Please refer to Figures 1 to 6 :
[0030] This utility model proposes a ceramic cover for a DC contactor, including an outer ceramic cover 1, a middle connecting base 2, and a lifting rod 3. An inner connecting slide 101 is fixedly connected inside the outer ceramic cover 1. Upper electrode terminals 102 are fixedly connected to both sides of the top of the outer ceramic cover 1. The upper electrode terminals 102 are made of silver-plated copper alloy, with a rated current of 100A and a contact resistance ≤5mΩ, meeting the high-current switching requirements of the DC contactor. A lower slot 103 is provided at the lower part of the upper electrode terminal 102. The upper end of the upper electrode terminal 102 extends to the outer side of the top of the outer ceramic cover 1, and the lower end of the upper electrode terminal 102 extends into the interior of the outer ceramic cover 1. The lower slot 103 is located inside the outer ceramic cover 1. A middle connecting base 2 is disposed inside the outer ceramic cover 1. Side locking strips 201 are fixedly arranged at intervals on both ends of the middle connecting base 2. An upper connecting tension spring 202 is fixedly connected to the upper part of each side locking strip 201. Guide sliding brackets 203 are fixedly connected to both sides of the middle part of the middle connecting base 2. The tail end of the upper connecting tension spring 202 is fixedly connected to the middle connecting base 2. The guide sliding bracket 203 is slidably connected to the inner connecting slide strip 101. A lifting rod 3 is slidably connected through the bottom of the outer ceramic cover 1. An upper connecting slide column 301 is slidably connected to the upper part of the lifting rod 3. A top support spring 302 is fixedly connected to the top, and the bottom of the lifting rod 3 is connected to the telescopic rod of an electromagnet. Precise displacement control of the lifting rod 3 is achieved through the movement of the electromagnet telescopic rod. When the lifting rod 3 moves upward under the support of the electromagnet, the upper connecting slide column 301 and the upper support spring 302 drive the middle connecting base plate 2 to move upward along the inner connecting slide bar 101. When the side locking strip 201 approaches the lower locking groove 103 of the upper electrode terminal 102, under the action of the spring preload, the wedge-shaped block at the upper end of the side locking strip 201 slides into the lower locking groove 103, achieving a tight fit and electrical connection between the middle connecting base plate 2 and the upper electrode terminal 102. The wedge block has an angle of 45°, and the inner wall of the lower slot 103 is set with a corresponding 45° bevel. When engaged, the wedge block and the bevel form an interference fit, providing an axial holding force of ≥10N. When the lifting rod 3 moves downward, it overcomes the spring force to disengage the side locking strip 201 from the lower slot 103, thus unlocking. The connection and separation time is ≤0.5 seconds. The upper end of the upper connecting slide column 301 is fixedly connected to the middle connecting base plate 2, and the upper end of the upper support spring 302 is fixedly connected to the middle connecting base plate 2. The upper support spring 302 provides support for the middle connecting base plate 2 and keeps the middle connecting base plate 2 and the upper electrode terminal 102 in close contact.
[0031] In this embodiment, when the top of the middle connecting substrate 2 and the lower end of the upper electrode terminal 102 are in a fitted state, the upper end of the side locking strip 201 is engaged inside the lower locking groove 103, and the wedge-shaped block at the upper end of the side locking strip 201 and the lower locking groove 103 are slidably engaged and connected. The fixed position between the upper electrode terminal 102 and the middle connecting substrate 2 makes the contact communication between the upper electrode terminal 102 and the middle connecting substrate 2 more stable, reducing the possibility of poor contact between the upper electrode terminal 102 and the middle connecting substrate 2.
[0032] In this second embodiment, based on the first embodiment, the lower end of the upper electrode terminal 102 is a beveled structure, and both ends of the middle connecting substrate 2 are also beveled structures. The beveled surfaces of the upper electrode terminal 102 and the middle connecting substrate 2 are kept in contact. The beveled structure expands the contact surface when the upper electrode terminal 102 and the middle connecting substrate 2 are in contact, further improving the effect of electrical connection.
[0033] The working principle of this embodiment is as follows: The bottom of the outer ceramic cover 1 is fixedly connected to the electromagnet module. The bottom of the lifting rod 3 is connected to the telescopic rod of the electromagnet. The displacement control of the lifting rod 3 is achieved by the movement of the electromagnet telescopic rod. When the lifting rod 3 moves upward under the support of the electromagnet, the lifting rod 3, the upper connecting slide column 301, and the upper support spring 302 drive the middle connecting base plate 2 to move upward along the inner connecting slide strip 101. When the side locking strip 201 approaches the lower locking groove 103 of the upper electrode terminal 102, under the action of the spring preload, the wedge-shaped block at the upper end of the side locking strip 201 slides into the lower locking groove 103, realizing the connection between the middle connecting base plate 2 and the upper electrode terminal 102. The tight fit and electrical connection of the middle connecting substrate 2 are achieved by the middle connecting substrate 2 moving closer to or further away from the upper electrode terminal 102 along the inner connecting slide 101 via the guide slide 203. The inner connecting slide 101 restricts the movement direction of the middle connecting substrate 2, effectively reducing contact offset caused by mechanical vibration. The back-and-forth movement of the middle connecting substrate 2 can lead to poor contact between the upper electrode terminal 102 and the middle connecting substrate 2. This reduces the possibility of poor contact between the upper electrode terminal 102 and the middle connecting substrate 2. According to third-party testing, after 100,000 cycles, the positional deviation of the middle connecting substrate 2 is ≤50μm, which is significantly better than the industry standard of ±200μm.
[0034] When the upper electrode terminal 102 and the middle connecting substrate 2 are bonded, the side retaining strip 201 and the lower retaining groove 103 remain engaged simultaneously. The 45° inclined surface design of the side retaining strip 201 and the lower retaining groove 103 creates an automatic centering effect, generating a lateral correction force ≥5N during the closing process, which can compensate for ±0.3mm. The assembly error is minimized, ensuring a perfect fit between the electrode terminals and the substrate. The wedge block and the slot provide axial holding force, and combined with spring preload, the contact resistance change rate is <3% under vibration conditions of 10-2000Hz, meeting the vibration test requirements of IEC60947-4-1. The fixed position between the upper electrode terminal 102 and the middle connecting substrate 2 makes the contact connection between the upper electrode terminal 102 and the middle connecting substrate 2 more stable, further reducing the possibility of poor contact. In the 800V / 350A high-voltage and high-current scenario of fast charging system for new energy vehicles, the contact resistance increase is <5% after 1000 consecutive charging cycles, significantly reducing the risk of overheating. In the industrial environment of industrial automation equipment with severe vibration, the malfunction rate is reduced from 0.1% of traditional contactors to 0.001%, improving system reliability. The ceramic cover structure, while maintaining the original performance of DC contactors, fundamentally solves the problem of poor contact through mechanical structural innovation, greatly improving the reliability and service life of the equipment, and has significant economic and social benefits.
[0035] The following points should be noted in this article:
[0036] 1. The accompanying drawings of the embodiments disclosed herein only involve structures relevant to the embodiments disclosed herein; other structures may refer to general designs.
[0037] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.
[0038] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.
Claims
1. A ceramic cover for a DC contactor, comprising: The outer ceramic cover (1), the middle connecting base plate (2) and the lifting rod (3) are characterized in that the middle connecting base plate (2) is provided inside the outer ceramic cover (1), the lifting rod (3) is slidably connected through the bottom of the outer ceramic cover (1), the inner connecting slide bar (101) is fixedly connected inside the outer ceramic cover (1), and the upper electrode terminal (102) is fixedly connected to both sides of the top of the outer ceramic cover (1), and the lower part of the upper electrode terminal (102) is provided with a lower slot (103).
2. The ceramic cover of the DC contactor according to claim 1, characterized in that, The upper end of the upper electrode terminal (102) extends to the outer side of the top of the outer ceramic cover (1), the lower end of the upper electrode terminal (102) extends into the interior of the outer ceramic cover (1), and the lower slot (103) is located inside the outer ceramic cover (1).
3. The ceramic cover of the DC contactor according to claim 1, characterized in that, Both ends of the middle connecting substrate (2) are fixedly arranged with side clips (201) at intervals. The upper part of the side clips (201) is fixedly connected with an upper connecting spring (202). Both sides of the middle part of the middle connecting substrate (2) are fixedly connected with guide sliding frames (203).
4. The ceramic cover of the DC contactor according to claim 3, characterized in that, The tail end of the upper connecting spring (202) is fixedly connected to the middle connecting base plate (2), and the guide sliding frame (203) and the inner connecting slide (101) are slidably connected.
5. The ceramic cover of the DC contactor according to claim 1, characterized in that, The upper part of the lifting rod (3) is slidably connected to an upper connecting slide column (301), and the top of the upper connecting slide column (301) is fixedly connected to an upper support spring (302).
6. The ceramic cover of the DC contactor according to claim 5, characterized in that, The upper end of the upper connecting slide (301) and the middle connecting base plate (2) are fixedly connected, and the upper end of the upper support spring (302) and the middle connecting base plate (2) are fixedly connected.
7. The ceramic cover of the DC contactor according to claim 3, characterized in that, When the top of the middle connecting substrate (2) and the lower end of the upper electrode terminal (102) are in a fitted state, the upper end of the side clip (201) is engaged inside the lower clip (103).