Miniaturized DC contactor

Abstract

The present invention discloses a miniaturized DC contactor, which includes a terminal, a ceramic arc extinguishing cover, an upper shell and a lower shell. A permanent magnet bracket, a contact bridge, a spring seat, a push rod, a sealing sleeve, a magnetic ring, a contact bracket, a contact spring, a guide, a magnetic plate, a moving iron, a coil and a U-shaped magnetic yoke are installed in the shell. A reaction spring is sleeved on the outer wall of the push rod. The lower part of the upper shell is inserted into the upper part of the lower shell. The buckling part of the upper shell and the lower shell is tightly matched. A lead fixing bracket is provided on the upper part of the lower shell. A "Z"-shaped lead fixing groove is provided on the inner wall of the lead fixing bracket. A lead fixing cover plate buckled on the top of the lead fixing bracket is provided at the corresponding position of the upper shell. The outer lead of the coil passes through the lead fixing groove and extends out of the lower shell. The present invention improves thermal conductivity, reduces product temperature rise, reduces product volume, reduces product weight, and is easy to install by optimizing the contact system and electromagnetic system structure.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage electrical equipment, in particular to a miniaturized direct current contactor. The direct current contactor has a small volume, a light weight and is easy to install. Background Art

[0002] A DC contactor is a contactor used in a DC circuit, mainly used to control a DC circuit (main circuit, control circuit, excitation circuit, etc.). The iron core of a DC contactor is different from that of an AC contactor. It does not have eddy currents, so it is generally made of soft steel or industrial pure iron in a round shape. Since the attraction coil of a DC contactor is connected to a DC current, there is no impact starting current, and there will be no violent impact of the iron core. Therefore, it has a long life and is suitable for occasions with frequent starts and stops.

[0003] In commonly used DC contactors, the coil terminal is located close to one side of the upper shell. After the external lead is welded to the terminal, it is directly led out from the notch of the shell and is no longer fixed in other ways. The coil lead welding position is prone to being pulled apart during assembly and transportation, which will cause product quality problems.

[0004] In the existing DC contactors, the static iron and the magnetic plate are riveted to form a yoke, and the electromagnetic coil and the circuit board are welded, which makes the product larger in size and heavier in weight, causing inconvenience in installation and use at the user end. In recent years, due to the continuous development of the use environment and body structure towards miniaturization and lightness, and the increasing market demand, the existing DC contactors can no longer meet the market demand. Summary of the invention

[0005] The purpose of the present invention is to provide a miniaturized DC contactor, which meets the structural requirements of miniaturization and lightness of the DC contactor through optimized structural design, so as to solve the defects of the existing DC contactor being large in size and heavy in weight.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A miniaturized DC contactor comprises a terminal, a ceramic arc extinguishing cover, an upper shell and a lower shell. The upper shell and the lower shell are buckled together to form a shell. A permanent magnet bracket, a contact bridge, a spring seat, a push rod, a sealing sleeve, a magnetic ring, a contact bracket, a contact spring, a guide, a magnetic plate, a moving iron, a coil and a U-shaped magnetic yoke are installed in the shell. A reaction spring is sleeved on the outer wall of the push rod. The lower part of the upper shell is inserted into the upper part of the lower shell. The buckling part of the upper shell and the lower shell is gap-matched. A circle of protrusions is arranged at the lower part of the outer wall of the upper shell. The top of the lower shell is in conflict with the lower surface of the protrusion. A lead fixing bracket is arranged at the upper part of the lower shell. A "Z"-shaped lead fixing groove is opened on the inner wall of the lead fixing bracket. A lead fixing cover plate buckled on the top of the lead fixing bracket is arranged at the corresponding position of the upper shell. The outer lead of the coil passes through the lead fixing groove and extends out of the lower shell.

[0008] Preferably, two wiring terminals are provided at one end of the bottom of the coil close to the upper surface of the bottom of the lower shell, one end of the wiring terminal is plugged into the coil frame, the enameled wire wound around the coil is fixed on the two wiring terminals, one end of the external lead is welded to the other end of the wiring terminal, and the other end of the external lead passes through the lead fixing groove on the lead fixing bracket in a positive direction upward and extends out of the lower shell.

[0009] Preferably, the push rod is injection molded at the center of the spring seat, and a circle of grooves is provided at the injection molding portion of the push rod and the spring seat along the radial direction of the push rod.

[0010] Preferably, an anti-rotation knurling pattern is provided on the outer wall of the injection molding portion of the push rod and the spring seat.

[0011] Preferably, thermally conductive epoxy resin is poured between the outer side of the coil and the inner wall of the lower shell.

[0012] Preferably, the upper shell and the lower shell are both made of nylon, the bottom lower surface of the lower shell is a smooth plane, and the bottom upper surface of the lower shell is provided with a groove.

[0013] The beneficial effects of the present invention are:

[0014] (1) The integrated design of the spring seat and the push rod in the present invention reduces the number of components in the contact system and the height of the product. The circuit board used in the prior art is removed, and the length and width of the entire product are reduced while ensuring low power consumption and energy saving, making the product miniaturized. By optimizing the structure of the contact system and the electromagnetic system, the thermal conductivity is improved, the temperature rise of the product is reduced, the product volume is reduced, the product weight is reduced, and the installation is easy.

[0015] (2) In the present invention, the upper shell and the lower shell are tightly matched to ensure the sealing of the shell; a lead fixing cover plate is provided on the outer wall of the upper shell, and a lead fixing bracket is provided on the outer wall of the lower shell; a "Z"-shaped lead fixing groove is provided on the inner wall of the lead fixing bracket to reliably fix the external lead, thereby improving the safety and reliability of the product. At the same time, various components are assembled inside the shell, reducing the volume of the shell and optimizing the structure of the product;

[0016] (2) The present invention designs the connection terminal of the coil to be located on one side close to the bottom surface of the lower shell, the enameled wire is fixed to one end of the connection terminal, the external lead is welded to the other end of the connection terminal, and the external lead is led out of the lower shell in a positive direction upward, thereby optimizing the fixing structure of the external lead and the connection terminal, avoiding the phenomenon that the coil lead welding position is easily pulled off during assembly and transportation, and improving the reliability of the product;

[0017] (3) In the present invention, the push rod is injection molded in the spring seat, and a groove is provided at the injection molding portion of the push rod, which can effectively prevent the push rod from falling off the spring seat; an anti-rotation knurling pattern is provided on the outer wall of the push rod, which can prevent the push rod from rotating in the spring seat, thereby improving the reliability of the product;

[0018] (4) The present invention pours heat-conductive epoxy resin between the coil and the inner wall of the lower shell. The epoxy resin not only fixes the coil and the outer lead wire to the shell, but also improves the heat conduction efficiency of the coil, improves the heat conduction performance of the electromagnetic system, and reduces the temperature rise of the coil.

[0019] (5) The present invention sets the bottom lower surface of the lower shell to a smooth plane, and the lower shell is directly mounted on the client mounting seat, which improves the thermal conductivity, facilitates the rapid heat dissipation of the coil, and reduces the temperature rise of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 is a side view of the present invention;

[0022] Figure 3 yes Figure 1 Schematic diagram of the assembly structure of the middle push rod and the spring seat;

[0023] Figure 4 yes Figure 3 A bottom-up cross-sectional view of

[0024] Figure 5 It is a schematic diagram of the assembly of the upper housing, the lower housing and the outer lead of the coil in the present invention;

[0025] Figure 6 It is a schematic diagram of the assembly structure of the coil and the terminal;

[0026] Figure 7 1 is a schematic diagram of the structure of the bottom surface of the lower shell;

[0027] Figure 8 It is a schematic diagram of the structure of the bottom surface and the upper surface of the lower shell;

[0028] In the figure: 1, terminal, 2, ceramic arc extinguishing cover, 3, permanent magnet bracket, 4, contact bridge, 5, spring seat, 6, push rod, 7, sealing sleeve, 8, magnetic ring, 9, lower shell, 10, upper shell, 11, contact bracket, 12, contact spring, 13, guide, 14, magnetic plate, 15, reaction spring, 16, moving iron, 17, coil, 18, U-shaped yoke, 19, permanent magnet, 20, groove, 21, external lead, 22, terminal, 23, lead fixing bracket, 24, lead fixing cover. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the embodiments.

[0030] like Figures 1 to 7 A miniaturized DC contactor is shown, which includes a terminal 1, a ceramic arc extinguishing cover 2, an upper shell 10 and a lower shell 9, the upper shell 10 and the lower shell 9 are buckled together to form a shell, and a permanent magnet bracket 3, a contact bridge 4, a spring seat 5, a push rod 6, a sealing sleeve 7, a magnetic ring 8, a contact bracket 11, a contact spring 12, a guide 13, a magnetic plate 14, a moving iron 16, a coil 17 and a U-shaped yoke 18 are installed in the shell, and a reaction spring 15 is sleeved on the outer wall of the push rod 6. The lower plug of the upper shell 10 is inserted into the upper shell 10. The upper shell 10 is inserted into the upper part of the lower shell 9, and the buckling part of the upper shell 10 and the lower shell 9 is tightly matched. A circle of protrusions is provided on the lower part of the outer wall of the upper shell 10, and the top of the lower shell 9 is in conflict with the lower surface of the protrusion; a lead fixing bracket 23 is provided on the upper part of the lower shell 9, and a "Z"-shaped lead fixing groove is opened on the inner wall of the lead fixing bracket 23. A lead fixing cover plate 24 buckled on the top of the lead fixing bracket 23 is provided at the corresponding position of the upper shell 10, and the outer lead 21 of the coil 17 passes through the lead fixing groove and extends out of the lower shell 9.

[0031] Two connecting terminals 22 are provided at one end of the bottom of the coil 17 close to the upper surface of the bottom of the lower shell 9, one end of the connecting terminal 22 is plugged into the coil frame, the enameled wire wound around the coil is fixed on the two connecting terminals 22, one end of the external lead 21 is welded to the other end of the connecting terminal 22, and the other end of the external lead 21 passes through the lead fixing groove on the lead fixing bracket 23 and extends out of the lower shell 9.

[0032] The push rod 6 is injection molded at the center of the spring seat 5 , and a circle of grooves 20 are formed in the injection molded parts of the push rod 6 and the spring seat 5 along the radial direction of the push rod 6 .

[0033] The outer walls of the injection molding parts of the push rod 6 and the spring seat 5 are provided with anti-rotation knurling patterns.

[0034] Epoxy resin is poured between the outer side of the coil 17 and the inner wall of the lower housing 9 .

[0035] The upper shell 10 and the lower shell 9 are both made of nylon. The lower surface of the bottom of the lower shell 9 is a smooth plane, and the upper surface of the bottom of the lower shell 9 is provided with a groove.

[0036] The integrated design of the spring seat and the push rod in the present invention reduces the static iron and the circuit board, thereby reducing the number of parts inside the contact system and reducing the height of the product; the circuit board used in the prior art is removed, and the length and width of the entire product are reduced while ensuring low power consumption and energy saving, making the product miniaturized; by optimizing the contact system and the electromagnetic system structure, the thermal conductivity is improved, the temperature rise of the product is reduced, the product volume is reduced, the product weight is reduced, and it is easy to install; in the present invention, the upper shell and the lower shell are tightly matched to ensure the sealing of the shell; a lead fixing cover plate is arranged on the outer wall of the upper shell, and a lead fixing bracket is arranged on the outer wall of the lower shell, and a "Z"-shaped lead fixing groove is opened on the inner wall of the lead fixing bracket to reliably fix the external lead, thereby improving the safety and reliability of the product.

Claims

1. A miniaturized DC contactor, comprising a terminal (1), a ceramic arc extinguishing cover (2), an upper shell (10) and a lower shell (9), wherein the upper shell (10) and the lower shell (9) are buckled together to form a shell, wherein a permanent magnet support (3), a contact bridge (4), a spring seat (5), a push rod (6), a sealing sleeve (7), a magnetic ring (8), a contact support (11), a contact spring (12), a guide member (13), a magnetic plate (14), a moving iron (16), a coil (17) and a U-shaped magnetic yoke (18) are installed in the shell, and a reaction spring (15) is sleeved on the outer wall of the push rod (6), characterized in that: The lower part of the upper shell (10) is inserted into the upper part of the lower shell (9), and the upper shell (10) and the lower shell (9) are The upper shell (10) and the lower shell (9) are tightly fitted at the buckling part, and a circle of protrusions is provided on the lower part of the outer wall of the upper shell (10), and the top of the lower shell (9) contacts the lower surface of the protrusion; a lead fixing bracket (23) is provided on the upper part of the lower shell (9), and a "Z"-shaped lead fixing groove is opened on the inner wall of the lead fixing bracket (23); a lead fixing cover plate (24) buckled on the top of the lead fixing bracket (23) is provided at a corresponding position of the upper shell (10), and the outer lead (21) of the coil (17) passes through the lead fixing groove and extends out of the lower shell (9).

2. The miniaturized DC contactor according to claim 1, characterized in that: Two connection terminals (22) are provided at one end of the bottom of the coil (17) close to the upper surface of the bottom of the lower shell (9), one end of the connection terminal (22) is plugged into the coil frame, the enameled wire wound around the coil is fixed to the two connection terminals (22), one end of the external lead (21) is welded to the other end of the connection terminal (22), and the other end of the external lead (21) passes through the lead fixing groove on the lead fixing bracket (23) in a positive and upward direction and extends out of the lower shell (9).

3. The miniaturized DC contactor according to claim 1 or 2, characterized in that: The push rod (6) is injection-molded at the center of the spring seat (5), and a circle of grooves (20) are provided in the injection-molded portion of the push rod (6) and the spring seat (5) along the radial direction of the push rod (6).

4. The miniaturized DC contactor according to claim 3, characterized in that: Anti-rotation knurling patterns are provided on the outer walls of the injection-molded parts of the push rod (6) and the spring seat (5).

5. The miniaturized DC contactor according to claim 4, characterized in that: Thermally conductive epoxy resin is poured between the outer side of the coil (17) and the inner wall of the lower shell (9).

6. The miniaturized DC contactor according to claim 5, characterized in that: The upper shell (10) and the lower shell (9) are both made of nylon; the bottom lower surface of the lower shell (9) is a smooth plane; and the bottom upper surface of the lower shell (9) is provided with a groove.

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