Waterproof high-breaking direct current contactor

Abstract

The utility model discloses a waterproof high breaking direct current contactor, which comprises a shell, and a contact system and an electromagnetic driving mechanism which are arranged in the shell, the contact system comprises a static contact and a moving contact, an opening and closing gap is formed between the static contact and the moving contact, and the electromagnetic driving mechanism drives the moving contact to be close to and far away from the static contact; the shell comprises a bottom shell, a middle shell and an upper cover which are sequentially connected from bottom to top, sealing gaskets are arranged at the joint of the bottom shell and the middle shell and the joint of the middle shell and the upper cover, the electromagnetic driving mechanism is installed in the bottom shell, a contact chamber is arranged between the middle shell and the upper cover, the contact system is located in the contact chamber, and a magnet is fixed to the side portion of an opening and closing gap in the contact chamber; through the arrangement of the sealing gasket and the magnet, the sealing waterproof performance of the DC contactor can be improved, arc extinguishing can be accelerated, the breaking capacity can be enhanced, and the product performance can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of direct current contactor, concretely relates to a waterproof high-break direct current contactor. BACKGROUND

[0002] The direct current contactor is a kind of electrical switching device specially used for controlling direct current circuit, and the magnetic field generated by coil drives moving contact and static contact to contact or separate, to realize the reliable switching and protection function to direct current load.There are several main problems in the practical application of current direct current contactor, many direct current contactors lack effective sealing design, so that moisture can easily penetrate into the contactor in humid or harsh environment, thereby easily causing electrical short circuit and other problems;In addition, some direct current contactors also lack arc extinguishing structure, which may cause arc not easy to extinguish when breaking the circuit, thereby affecting the service life and safety of direct current contactor. SUMMARY

[0003] To this end, the utility model provides a kind of direct current contactor with reasonable structure, with good waterproof performance, and by setting magnet, arc is helped to extinguish quickly, to improve breaking capacity.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] The utility model provides a kind of waterproof high-break direct current contactor, including shell, and the contact system and electromagnetic drive mechanism being set in the shell, the contact system includes static contact and moving contact, and the static contact and moving contact are formed with opening and closing gap, and the electromagnetic drive mechanism drives moving contact to be close to and away from the static contact;The shell includes the bottom shell, the middle shell and the upper cover connected in sequence from bottom to top, the junction of bottom shell and middle shell and the junction of middle shell and upper cover are equipped with sealing pad, the electromagnetic drive mechanism is installed in the bottom shell, the middle shell and upper cover are equipped with contact chamber, the contact system is in the contact chamber, and magnet is fixed in the opening and closing gap side in the contact chamber.

[0006] Preferably, the electromagnetic drive mechanism includes electromagnetic assembly fixed in the bottom shell and push rod driven by electromagnetic assembly, and the upper end of the push rod is connected with the moving contact through the middle shell.

[0007] Preferably, the second wiring terminal is provided on the upper cover, and the lead of the electromagnetic assembly passes through the middle shell and is connected with the second wiring terminal.

[0008] Preferably, the static contact is fixed in the wiring row inner end, the wiring row is integrally injection molded with the middle shell and penetrates the side wall of the middle shell, and the first wiring terminal is arranged on the wiring row outer end.

[0009] Preferably, a baffle is arranged on the middle shell in the contact chamber between the contact system and the lead wire.

[0010] Preferably, the middle shell is in a rectangular structure, two magnets are arranged diagonally in the middle shell, and the movable contact is arranged between the two magnets.

[0011] Preferably, the middle shell is provided with a positioning slot, and the magnet is fixed in the positioning slot.

[0012] Preferably, the middle shell is provided with a protruding rotation stop block on both sides of the movable contact, which forms a stop limit for the movable contact to prevent the movable contact from rotating relative to the middle shell.

[0013] Preferably, the sealing pad is a silica gel pad or a rubber pad, and the bottom shell and the middle shell and the middle shell and the upper cover are fixedly connected by screws.

[0014] The utility model has the positive effect that: in the utility model, the structure of the direct current contactor is optimized, the gap between the bottom shell and the middle shell and the gap between the middle shell and the upper cover are sealed by the sealing pad, thereby preventing dust and water from entering the inside of the shell, and ensuring the use performance of the product, the electromagnetic driving mechanism is arranged in the bottom shell, the contact chamber is arranged between the middle shell and the upper cover, the contact system is in the contact chamber, and the magnet is fixed on the side of the opening and closing gap in the contact chamber, the magnetic field of the magnet can generate magnetic blowing effect on the electric arc generated in the opening and closing gap between the movable contact and the static contact, accelerate the extinction of the electric arc, and thereby improve the breaking capacity of the direct current contactor. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following briefly introduces the drawings needed to be used in the specific embodiment or the prior art description. In the drawings, similar elements or parts are generally identified by similar reference numerals. The elements or parts in the drawings are not necessarily drawn according to the actual proportion.

[0016] Figure 1 It is a three-dimensional schematic view of the direct current contactor in the utility model;

[0017] Figure 2 It is an explosion schematic view of the direct current contactor in the utility model;

[0018] Figure 3 It is a three-dimensional schematic view of the direct current contactor in the utility model after removing the upper cover;

[0019] Figure 4 It is Figure 3 It is a local enlarged schematic view of A in the middle;

[0020] Figure 5It is a three-dimensional schematic view of the middle shell, the static contact and the magnet in the cooperation state in the utility model.

[0021] The reference signs shown in the figure are: 1, shell; 11, bottom shell; 12, middle shell; 120, baffle; 121, rotation stopping block; 122, positioning slot; 13, upper cover; 2, first terminal; 3, terminal strip; 4, second terminal; 5, electromagnetic drive mechanism; 51, coil assembly; 52, push rod; 6, sealing gasket; 7, coil lead-out wire; 8, magnet; 10, static contact; 20, dynamic contact. DETAILED DESCRIPTION

[0022] The embodiments of the technical scheme of the utility model are described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, thus only as an example, and cannot limit the protection scope of the utility model.

[0023] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be the usual meaning understood by the technical personnel in the field to which the utility model belongs.

[0024] As Figures 1-5 shown, the waterproof high-break DC contactor in the utility model embodiment, including shell 1, and setting in the contact system and electromagnetic drive mechanism 5 of shell 1, the contact system includes static contact 10 and dynamic contact 20, the static contact 10 and dynamic contact 20 between the opening and closing gap are formed, the electromagnetic drive mechanism 5 drives dynamic contact 20 to approach and away from the static contact 10, when static contact 10 and dynamic contact 20 contact, will circuit conduction, when static contact 10 and dynamic contact 20 separate, will circuit break, in order to facilitate the assembly of each component in shell 1, the shell 1 includes the bottom shell 11, the middle shell 12 and the upper cover 13 connected in turn from bottom to top, the junction of the bottom shell 11 and the middle shell 12 and the junction of the middle shell 12 and the upper cover 13 are provided with sealing gasket 6, the sealing gasket 6 is preferably made of rubber pad or silica gel pad, the sealing gasket 6 can seal the joint between the bottom shell 11 and the middle shell 12 and the gap between the middle shell 12 and the upper cover 13, so as to prevent dust and water from entering the inside of the shell 1, and ensure the product performance, the electromagnetic drive mechanism 5 is installed in the bottom shell 11, the middle shell 12 and the upper cover 13 are provided with contact chamber, the contact system is in the contact chamber, the magnet 8 is fixed in the opening and closing gap in the contact chamber, the magnetic field of the magnet 8 can produce magnetic blowing effect on the arc generated between the dynamic contact 20 and the static contact 10 in the opening and closing gap, accelerate arc extinguishing, so as to improve the breaking capacity of the DC contactor.

[0025] In this embodiment, it comprises a moving contact 20 and two static contacts 10 respectively arranged at both ends of the moving contact 20, two said opening and closing gaps are formed between the two static contacts 10 and the moving contact 20, and the two said opening and closing gaps are both provided with the magnet 8. The arc extinguishing effect can be further improved by arranging the magnet 8 at the two opening and closing gaps.

[0026] Referring to Figure 2 As shown in the figure, the electromagnetic driving mechanism 5 comprises an electromagnetic assembly 51 fixed in the bottom shell 11 and a push rod 52 driven by the electromagnetic assembly 51, and the upper end of the push rod 52 is connected with the moving contact 20 through the middle shell 12. When the electromagnetic assembly 51 is powered, the push rod 52 is attracted or pushed, so that the moving contact 20 is displaced correspondingly. When the power is cut off, the push rod 52 is restored to the original position under the action of other forces (such as spring force). The electromagnetic assembly 51 usually comprises a coil frame, an electromagnetic coil, a magnetic yoke, a spring and the like.

[0027] Combining Figure 1 And Figure 2 As shown in the figure, the second wiring terminal 4 is arranged through the upper cover 13, the lead wire 510 of the electromagnetic assembly 51 passes through the middle shell 12 and is connected with the second wiring terminal 4, the second wiring terminal 4 is used for connecting the external control circuit, so as to realize the control of the electromagnetic assembly 51. The second wiring terminal 4 is integrally injection molded with the upper cover 13, so that the assembly process can be omitted, and the second wiring terminal 4 and the upper cover 13 can be tightly combined to avoid the gap between them.

[0028] As Figure 5 shown, the static contact 10 is fixed on the wiring row 3, and the wiring row 3 is integrally injection molded with the middle shell 12 and penetrates the side wall of the middle shell 12, so that the assembly process of the wiring row 3 and the middle shell 12 can be omitted, and the wiring row 3 and the middle shell 12 can be tightly combined to avoid the gap between them. The first wiring terminal 2 is arranged at the outer end of the wiring row 3, and the wiring terminal 2 is connected with the lead wire of the external main circuit, so as to connect the DC contactor into the main circuit.

[0029] As Figure 5 shown, the baffle 120 is arranged in the contact chamber of the middle shell 12, and the baffle 120 is arranged between the contact system and the lead wire 510. The baffle 120 forms an effective protection measure by physically isolating the contact system and the lead wire 510, which can block the arc from spreading to the lead wire 510, thereby preventing the arc from damaging the lead wire 510.

[0030] Continuing to refer to Figure 5As shown, the middle shell 12 is in a rectangular structure, the magnets 8 are two and the two magnets 8 are diagonally arranged in the middle shell 12, and the moving contact 20 is arranged between the two magnets 8, which helps to optimize the utilization of space, so that the internal components of the middle shell 12 are reasonably distributed, thereby facilitating better functional synergy.

[0031] In order to facilitate the installation of the magnet 8 in the contact chamber, a positioning groove 122 is arranged on the middle shell 12, and the magnet 8 is fixed in the positioning groove 122 to accurately position and stably fix the magnet 8.

[0032] The middle shell 12 is provided with a protruding rotation stop block 121 on both sides of the moving contact 20, which forms a stop limit for the moving contact 20 to prevent the moving contact 20 from rotating relative to the middle shell 12, so as to ensure that the stationary contact and the moving contact can be reliably contacted.

[0033] The bottom shell 11 and the middle shell 12 and the middle shell 12 and the upper cover 13 are fixedly connected by screws, so that the components of the shell 1 can be reliably fixed.

[0034] For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. The changes or variations which belong to the substantial spirit of the present application and are extended are still within the protection scope of the present application.

Claims

1. A waterproof high-breaking capacity DC contactor, comprising a housing (1), and a contact system and an electromagnetic drive mechanism (5) disposed within the housing (1), wherein the contact system comprises a stationary contact (10) and a moving contact (20), a closing gap being formed between the stationary contact (10) and the moving contact (20), and the electromagnetic drive mechanism (5) drives the moving contact (20) to approach and move away from the stationary contact (10); characterized in that: The housing (1) includes a bottom shell (11), a middle shell (12) and a top cover (13) connected sequentially from bottom to top. Sealing gaskets (6) are provided at the joint between the bottom shell (11) and the middle shell (12) and at the joint between the middle shell (12) and the top cover (13). The electromagnetic drive mechanism (5) is installed inside the bottom shell (11). A contact chamber is provided between the middle shell (12) and the top cover (13). The contact system is located in the contact chamber. A magnet (8) is fixed in the side of the opening and closing gap inside the contact chamber.

2. The waterproof high-breaking capacity DC contactor according to claim 1, characterized in that: The electromagnetic drive mechanism (5) includes an electromagnetic component (51) fixed in the bottom shell (11) and a push rod (52) driven by the electromagnetic component (51). The upper end of the push rod (52) passes through the middle shell (12) and is connected to the moving contact (20).

3. The waterproof high-breaking capacity DC contactor according to claim 2, characterized in that: A second terminal (4) is provided through the upper cover (13), and the lead (510) of the electromagnetic component (51) passes through the middle shell (12) and is connected to the second terminal (4).

4. The waterproof high-breaking capacity DC contactor according to claim 1, characterized in that: The stationary contact (10) is fixed to the inner end of the terminal block (3). The terminal block (3) is injection molded into the middle shell (12) and penetrates the side wall of the middle shell (12). The outer end of the terminal block (3) is provided with a first terminal (2).

5. The waterproof high-breaking capacity DC contactor according to claim 3, characterized in that: A baffle (120) is provided on the middle shell (12) in the contact chamber, and the baffle (120) is located between the contact system and the lead wire (510).

6. The waterproof high-breaking capacity DC contactor according to claim 1, characterized in that: The middle shell (12) has a rectangular structure, and there are two magnets (8) arranged diagonally inside the middle shell. The moving contact extends between the two magnets (8).

7. The waterproof high-breaking capacity DC contactor according to claim 6, characterized in that: The middle shell (12) is provided with a positioning groove (122), and the magnet (8) is fixed in the positioning groove (122).

8. The waterproof high-breaking capacity DC contactor according to claim 5, characterized in that: The middle shell (12) has protruding anti-rotation blocks (121) formed on both sides of the moving contact (20). The anti-rotation blocks (121) stop and limit the moving contact (20) to prevent the moving contact (20) from rotating relative to the middle shell (12).

9. The waterproof high-breaking capacity DC contactor according to claim 1, characterized in that: The sealing gasket (6) is a silicone gasket or a rubber gasket, and the bottom shell (11) and the middle shell (12) and the middle shell (12) and the top cover (13) are fixedly connected by screws.

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