DC contactor

Abstract

A DC contactor includes: a housing; two static binding posts are arranged at the upper end of the opening and closing module; the cover plate and the shell are matched to form a second cavity used for pouring epoxy resin between the upper end face of the opening and closing module and the shell, and a sand blasting layer used for enhancing the bonding force between the static binding post and the epoxy resin is arranged in the circumferential direction of the static binding post located in the second cavity. The static binding post extends outwards in the circumferential direction to form a first flange matched with an arc isolating cover of the opening and closing module and a second flange matched with the through hole of the cover plate, and the first flange and the second flange are located on the upper side and the lower side of the sand blasting layer respectively. The shell is divided into the upper cavity and the lower cavity through the arc isolating cover, epoxy resin is poured into the upper cavity to achieve sealing, the position, making contact with the epoxy resin, of the static binding post is arranged to be the sand blasting layer, and the bonding force between the static binding post and the epoxy resin is increased through the non-smooth design of the surface of the sand blasting layer; and the phenomenon of unreliable bonding between the two parts after long-time use can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to a DC contactor. Background Technology

[0002] A high-voltage DC contactor is a switching device used in DC transmission systems, capable of rapidly disconnecting and connecting circuits under high voltage and high current conditions. Currently, high-voltage DC contactors on the market are classified into two types according to their sealing method: glue-sealed (post-type) and ceramic (square-type). Glue-sealed contactors can provide auxiliary contact functionality but have relatively lower performance, while ceramic contactors offer more reliable performance but lack auxiliary contact functionality. The sealing performance of glue-sealed products mainly relies on the cured epoxy resin. The terminal block, as the connection structure between internal and external circuits, needs to penetrate the epoxy resin and is fixed by it. However, because the surface of the terminal block undergoes an electroplating process, it becomes relatively smooth, resulting in poor adhesion between the terminal block and the epoxy resin. Over prolonged use, this can lead to breakage at the connection point, thus affecting the internal sealing performance. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a DC contactor.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A DC contactor comprising:

[0006] The outer shell has an opening at one end and a first cavity inside.

[0007] The opening and closing module is located in the first cavity, and its upper end is provided with two stationary terminals.

[0008] The cover plate has an outlet for the stationary terminal to pass through and several through holes. The cover plate and the outer shell cooperate to form a second cavity for injecting epoxy resin between the upper end face of the switching module and the outer shell.

[0009] The stationary terminal located in the second cavity is provided with a sandblasted layer in the circumferential direction to enhance the adhesion between the stationary terminal and the epoxy resin. The stationary terminal extends outward in the circumferential direction to form a first flange that cooperates with the arc isolation cover of the circuit breaker module and a second flange that cooperates with the through hole of the cover plate. The first flange and the second flange are respectively located on the upper and lower sides of the sandblasted layer.

[0010] The sandblasted layer has a grid-like texture.

[0011] The switching module includes:

[0012] The shell has an opening at one end and a third cavity inside.

[0013] The coil assembly is located within the third cavity;

[0014] An arc-extinguishing cover, which has an arc-extinguishing chamber inside, is placed in the third cavity and located on the upper side of the coil assembly;

[0015] A contact assembly is disposed within the arc-extinguishing chamber and includes a moving contact driven by the coil assembly and a stationary terminal disposed above the moving contact.

[0016] The arc-blocking cover has a first step circumferentially at the terminal hole, and the stationary terminal has a second step that mates with the first flange.

[0017] The moving contact is a contact plate with rounded ends.

[0018] The switching module is also equipped with an electromagnetic component.

[0019] The electromagnetic component includes a guide plate with mounting grooves at both ends, and a magnet is provided in the mounting groove.

[0020] The cover plate is provided with a partition plate, which is disposed between the two outlets.

[0021] The cover plate is also provided with a cap, the bottom of the cap is provided with a mating groove, the two ends of the mating groove are provided with pins, and the two ends of the isolation plate are provided with insertion holes that are adapted to the pins.

[0022] The beneficial effects of this utility model are as follows: by dividing the outer shell into upper and lower cavities by the arc-shielding cover, the upper cavity is sealed by injecting epoxy resin, and the position where the stationary terminal contacts the epoxy resin is set as a sandblasted layer. The non-smooth surface design increases the adhesion between the terminal and the epoxy resin, which can avoid the phenomenon of unreliable adhesion between the two after long-term use. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the present invention (with epoxy resin omitted).

[0026] Figure 4 This is a schematic diagram of the opening and closing module of this utility model.

[0027] Figure 5 This is a cross-sectional schematic diagram of the opening and closing module of this utility model.

[0028] Figure 6This is a schematic diagram of the internal structure of the opening and closing module of this utility model.

[0029] Figure 7 This is a schematic diagram of the static terminal block of this utility model.

[0030] Figure 8 This is a schematic diagram of the cover plate of this utility model.

[0031] Figure 9 This is a schematic diagram of the structure of the cap of this utility model. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a DC contactor, which includes a housing 100 and a switching module disposed inside the housing, and is covered by a cover plate. At the same time, the cover plate and the switching module are sealed and fixed by injecting epoxy resin.

[0035] The outer casing 100 has an opening at one end and a first cavity inside. The bottom of the outer casing has a connecting seat for fixed connection. A circuit board box can also be set on one side of the outer casing to hold the control circuit board and connect it to the coil assembly of the internal opening and closing module through wires.

[0036] The circuit board box contains a control circuit board with power lines and auxiliary lines. The auxiliary lines are used to connect the control circuit board and the connection terminals for connecting to the coil assembly. The power lines extend outside the circuit board box after being connected to the control circuit board. The connection terminals of the auxiliary lines are connected to the connection terminals of the opening and closing module via the second cavity, and the connection is fixed with epoxy resin.

[0037] like Figure 4 , Figure 5 and Figure 6As shown, the circuit breaker opening and closing module is located within the first cavity, and its upper end is provided with two stationary terminals 1000. The circuit breaker opening and closing module includes:

[0038] The shell 10 has an opening at one end and a third cavity inside;

[0039] A coil assembly 500 is disposed in the third cavity. The coil assembly 500 includes a coil frame and a coil wound on the coil assembly. The coil frame has a central hole. An iron core and a push rod linked with the iron core are disposed in the central hole. A magnetic sleeve is disposed between the iron core and the coil frame. Using electromagnetic principle, the push rod is driven to move in the axial direction. A moving contact is fixedly disposed at the top of the push rod, so that the moving contact can contact or separate from the stationary terminal.

[0040] An arc-extinguishing cover 900 is provided inside an arc-extinguishing chamber, which is placed in the third cavity and located on the upper side of the coil assembly 500. A pair of terminal holes are provided on the top edge of the arc-extinguishing cover, through which the stationary terminal passes and engages with the internal moving contact.

[0041] The contact assembly is disposed in the arc-extinguishing chamber and includes a moving contact 600 driven by the coil assembly 500 and a stationary terminal 1000 disposed above the moving contact 600.

[0042] The arc-blocking cover 900 has a first step 20 circumferentially provided at the terminal hole, and the stationary terminal 1000 has a second step that matches it at the first flange. That is, the maximum diameter of the first flange of the stationary terminal is greater than the diameter of the terminal hole of the arc-blocking cover. By using the overlap of the two, the stationary terminal is supported and fixed, and at the same time, the stationary terminal plays the role of sealing the arc-blocking cover.

[0043] The switching module is also equipped with an electromagnetic component.

[0044] The electromagnetic component includes a guide plate 700 with mounting grooves at both ends, and a magnet 800 is installed within the mounting grooves. The magnet 800 is a magnetic steel. The interaction of the magnetic fields of the magnetic steel increases the magnetic flux density, improves the product's ability to extinguish arcs with magnetic blowout, solves the problem of DC contactors being able to switch loads without polarity, improves the product's electrical life and breaking power, and achieves cost reduction and quality improvement by using a ceramic cover instead of ceramic brazing.

[0045] The cover plate 200 has an outlet 220 for the stationary terminal 1000 to pass through and several through holes 230. The cover plate 200 and the outer shell 100 cooperate to form a second cavity 110 for injecting epoxy resin 300 between the upper end face of the switching module and the outer shell 100.

[0046] See Figure 7The stationary terminal 1000 located in the second cavity 110 is provided with a sandblasted layer 1100 in the circumferential direction to enhance the adhesion between the stationary terminal and the epoxy resin 300. The stationary terminal 1000 extends outward in the circumferential direction to form a first flange 1200 that cooperates with the arc shield 900 of the circuit breaker module and a second flange 1300 that cooperates with the through hole of the cover plate 200. The first flange 1200 and the second flange 1300 are respectively located on the upper and lower sides of the sandblasted layer 1100.

[0047] The coil generates a magnetic field through electromagnetic induction. Under the action of electromagnetic attraction, the iron core moves along the axis of the push rod. The push rod and the iron core are linked. The moving contact moves towards the stationary contact. When the moving contact makes reliable contact with the stationary terminal, the reaction spring and the contact spring are compressed to the working state. When the coil is de-energized, the electromagnetic attraction disappears, the reaction spring returns to the initial state, the iron core is released, and the moving contact separates from the stationary terminal.

[0048] The sandblasted layer 1100 has a grid-like texture. The grid-like texture design utilizes the sandblasting layer to disrupt the electroplated layer of the stationary terminal, making its surface uneven. This allows the epoxy resin to adhere more firmly to the terminal during injection. At the same time, the sandblasting layer design increases the contact area with the epoxy resin, increases the radial force, prevents the stationary terminal from rotating under external force, and improves air tightness.

[0049] The moving contact 600 is a contact plate with rounded ends, which reduces the situation where the electric arc is concentrated at the square tip when the contact is segmented, thus reducing the concentrated arc erosion and significantly improving the electrical life of the product.

[0050] See Figure 8 The cover plate 200 is provided with an isolation plate 210, which is disposed between two outlets 220 for electrical isolation of the two stationary terminals.

[0051] Meanwhile, the through hole 230 provided on it can be used for both injecting epoxy resin and observing the internal state, making it easy to understand the injection status of epoxy resin.

[0052] See Figure 9 The cover plate 200 is also provided with a cap 400, the cap 400 has a mating groove 410 at the bottom, the mating groove 410 has pins 420 at both ends, and the isolation plate 210 has insertion holes 220 at both ends that are adapted to the pins 420.

[0053] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A direct current contactor characterized by: It includes: The shell (100) is provided with a first cavity in the opening of one end; The opening and closing module is arranged in the first cavity, and the upper end of the opening and closing module is provided with two static contact posts (1000); The cover plate (200) is provided with an outlet (220) for the static contact post (1000) to pass through and a plurality of through holes (230), and the cover plate (200) is matched with the shell (100) between the upper end surface of the opening and closing module and the shell (100) to form a second cavity (110) for pouring epoxy resin (300), The static contact post (1000) in the second cavity (110) is provided with a sandblasting layer (1100) for enhancing the adhesion between the static contact post (1000) and the epoxy resin (300), the static contact post (1000) extends outward in the circumferential direction to form a first flange (1200) matched with the arc separation cover (900) of the opening and closing module and a second flange (1300) matched with the through hole of the cover plate (200), and the first flange (1200) and the second flange (1300) are located on the upper and lower sides of the sandblasting layer (1100) respectively.

2. The DC contactor of claim 1, wherein: The sandblasting layer (1100) is a grid pattern.

3. The DC contactor of claim 2, wherein: The opening and closing module includes: The shell (10) is provided with a third cavity in the opening of one end; The coil assembly (500) is arranged in the third cavity; The arc separation cover (900) is provided with an arc extinguishing chamber in the shell (10), and is arranged in the third cavity and on the upper side of the coil assembly (500); The contact assembly is arranged in the arc extinguishing chamber, and includes a moving contact (600) driven by the coil assembly (500) and a static contact post (1000) arranged above the moving contact (600).

4. The DC contactor of claim 3, wherein: The arc separation cover (900) is provided with a first step (20) in the circumferential direction of the terminal hole, and the first flange of the static contact post (1000) is provided with a second step matched with the first flange.

5. The DC contactor of claim 3, wherein: The moving contact (600) is a contact plate, and the two ends of the moving contact (600) are arc surfaces.

6. The DC contactor of claim 3, wherein: The opening and closing module is also provided with an electromagnetic assembly.

7. The DC contactor of claim 6, wherein: The electromagnetic assembly includes a guide plate (700), and the two ends of the guide plate (700) are provided with mounting grooves, and the mounting grooves are provided with magnets (800).

8. The DC contactor of claim 1, wherein: The cover plate (200) is provided with an isolation plate (210), and the isolation plate (210) is arranged between the two outlets (220).

9. The DC contactor of claim 8, wherein: The cover plate (200) is also provided with a cap (400), and the bottom of the cap (400) is provided with a matching groove (410), and the two ends of the matching groove (410) are provided with latches (420), and the two ends of the isolation plate (210) are provided with plug holes (220) matched with the latches (420).

Images