Portable installation DC contactor

Abstract

This application relates to a DC contactor with convenient installation, belonging to the field of DC contactor technology. It includes an upper housing, a lower housing, and a contact system disposed within the upper and lower housings. This application utilizes a locking mechanism, a positioning platform, anti-loosening spring washers, an annular boss, and a groove. During installation, there is no need to repeatedly align multiple screws; simply align the long screw on the upper housing with the positioning hole on the lower housing, and tighten the long screw to lock the threaded section into the positioning hole. At this time, the positioning platform on the positioning hole fits tightly against the bottom surface of the upper housing, limiting radial displacement between the upper and lower housings and preventing misalignment. The anti-loosening spring washer at the tail of the long screw abuts against the top surface of the upper housing, generating a continuous preload after tightening to counteract the loosening tendency under vibration. The annular boss and groove on the mating surfaces of the upper and lower housings have an interference fit, eliminating assembly gaps between the housings. Simultaneously, the locking mechanism is evenly distributed circumferentially, ensuring balanced force distribution between the upper and lower housings.

Description

Technical Field

[0001] This application relates to the field of DC contactor technology, and in particular to DC contactors with convenient installation. Background Technology

[0002] In the field of DC contactor technology, traditional installation methods generally rely on multiple screws or bolts to fix the upper and lower housings, such as by tightening screws through evenly distributed threaded holes along the housing edge. This method requires repeated alignment and tightening operations, which is inefficient, especially in confined spaces or dense wiring scenarios, and requires a high level of operator skill. In addition, while existing quick-installation solutions (such as spring clips or magnetic positioning) can simplify the process, they are limited by structural strength and applicable operating conditions, and are prone to loosening in environments with frequent vibrations, such as industrial equipment or vehicle environments.

[0003] Regarding contact reliability, traditional DC contactors often suffer from uneven contact pressure due to installation stress. Furthermore, prolonged use can lead to oxidation or arc erosion of the contact surface, resulting in increased contact resistance and even intermittent circuit breaking. Some improvements alleviate the problem by increasing spring pressure or using silver alloy contacts, but these do not fundamentally solve the contact instability caused by accumulated mechanical stress during installation. In addition, existing sealing structures (such as epoxy encapsulation) are prone to cracking under installation torque, leading to air leakage in the arc-extinguishing chamber and further reducing breaking capacity. Therefore, a DC contactor with convenient installation is needed. Utility Model Content

[0004] The purpose of this application is to provide a DC contactor that is easy to install, has the advantages of easy installation, resistance to vibration and loosening, ensuring stable contact of contacts, effectively suppressing arc erosion and improving the sealing of the arc extinguishing cavity.

[0005] The conveniently installed DC contactor provided in this application adopts the following technical solution: it includes an upper housing, a lower housing, and a contact system disposed inside the upper and lower housings. The upper and lower housings are detachably connected by a locking mechanism. The locking mechanism includes a long screw penetrating the upper housing and a positioning hole opened on the lower housing. The positioning hole is adapted to the threaded section of the long screw. A ceramic component and a magnet are disposed inside the upper and lower housings. The ceramic component is located around the contact system, and the magnet is magnetically coupled to the contact system. By adopting the above technical solution and setting a locking mechanism, the upper and lower housings can be detachably connected simply by matching the long screw with the positioning hole, without relying on multiple scattered screws, greatly simplifying the installation operation. At the same time, the ceramic components inside the upper and lower housings are located on the periphery of the contact system, which can form basic protection for the contact system. The magnetic coupling between the magnet and the contact system provides the basic conditions for arc handling, thus solving the problems of cumbersome traditional installation and insufficient contact protection.

[0006] Preferably, the locking mechanism is evenly distributed along the circumference of the upper and lower housings, and the number is four to six sets.

[0007] By adopting the above technical solution, the locking mechanism is evenly distributed along the circumference of the upper and lower shells, so that the force exerted by multiple locking mechanisms on the upper and lower shells is balanced, avoiding local stress concentration that could lead to shell deformation. Compared with the traditional non-uniformly distributed fixing method, this can further ensure the structural stability of the upper and lower shells after assembly and extend the service life of the shells.

[0008] Preferably, an outer shell is fastened to the outside of the upper shell, and the outer shell and the upper shell are engaged by a snap or a slot.

[0009] By adopting the above technical solution, by fastening the outer shell to the outside of the upper shell, and by having the outer shell and the upper shell cooperate through snaps or slots, a double protection can be formed outside the inner shell, isolating external dust, moisture and other impurities, and protecting core components such as the internal contact system and ceramic components. On the other hand, the snaps or slots facilitate the disassembly of the outer shell for maintenance in the later stage, solving the problem of inconvenient disassembly and assembly of traditional external protective structures.

[0010] Preferably, the ceramic assembly includes a ceramic cover and a ceramic insulating post, the ceramic cover covering the breaking area of ​​the contact system, and the ceramic insulating post supporting and insulating the contact system.

[0011] By adopting the above technical solution, the ceramic assembly is divided into a ceramic cover and a ceramic insulating column: the ceramic cover covers the breaking area of ​​the contact system, which can limit the electric arc generated when the contact breaks to a closed space and prevent the electric arc from leaking out and burning the shell or surrounding components; the ceramic insulating column supports and insulates the contact system, which can not only avoid the installation stress from being transmitted to the contact system and causing uneven contact, but also isolate the contact system from the conductive risk of the shell, thus doubly improving the reliability of the contact system.

[0012] Preferably, the magnet is a permanent magnet, symmetrically arranged along the direction of movement of the contact system, and its magnetic field direction is perpendicular to the direction of arc movement when the contacts break.

[0013] By adopting the above technical solution, and by defining the magnet as a permanent magnet and symmetrically arranging it along the direction of movement of the contact system, with its magnetic field direction perpendicular to the direction of arc movement when the contact breaks, the magnetic field can generate a directional force on the arc, pushing the arc to quickly detach from the contact surface and lengthen, thus accelerating the extinguishing of the arc. Compared with ordinary magnets, it can more effectively suppress the ablation of the contact system by the arc, reduce contact oxidation or adhesion, and extend the service life of the contact system.

[0014] Preferably, the positioning hole has a stepped structure, including a threaded section that mates with a long screw and a positioning platform that fits against the bottom surface of the upper housing, wherein the positioning platform is a stepped surface on the positioning hole of the lower housing.

[0015] By adopting the above technical solution, and by setting the positioning hole as a stepped structure, and the positioning platform as the stepped surface on the positioning hole of the lower shell, the positioning platform can fit tightly with the bottom surface of the upper shell during installation, directly restricting the radial displacement of the upper and lower shells, avoiding assembly misalignment, eliminating the need to repeatedly adjust the shell position, and reducing the skill requirements for operators.

[0016] Preferably, the tail of the long screw is fitted with an anti-loosening spring washer, which abuts against the top surface of the upper housing.

[0017] By adopting the above technical solution, and by installing an anti-loosening spring washer at the tail of the long screw, with the anti-loosening spring washer abutting against the top surface of the upper housing, the anti-loosening spring washer will generate a continuous preload after the long screw is tightened. This can counteract the loosening tendency under vibration environment, effectively solve the problem of traditional screws being easy to loosen under high-frequency vibration conditions such as industrial equipment or vehicle, and ensure the long-term stability of the structure.

[0018] Preferably, the mating surfaces of the upper and lower housings are provided with an annular boss and a groove, and the annular boss and the groove are interference-fitted.

[0019] By adopting the above technical solution, by setting an annular boss and a groove on the mating surface of the upper and lower housings, and by interfering with the annular boss and the groove, the assembly gap between the housings can be completely eliminated. Compared with traditional sealing methods such as epoxy encapsulation, it can avoid cracks in the sealing structure caused by installation torque, prevent air leakage in the arc extinguishing cavity, and further improve the breaking capacity of the DC contactor.

[0020] In summary, this application includes at least one of the following beneficial technical effects: 1. This conveniently installed DC contactor, through its locking mechanism, positioning platform, anti-loosening spring washer, annular boss, and groove, eliminates the need for repeated alignment of multiple screws during installation. Simply align the long screw on the upper housing with the positioning hole on the lower housing, and tighten the long screw to lock the threaded section into the positioning hole. At this point, the positioning platform on the positioning hole fits tightly against the bottom surface of the upper housing, limiting radial displacement between the upper and lower housings and preventing misalignment. The anti-loosening spring washer at the tail of the long screw abuts against the top surface of the upper housing, generating a continuous preload after tightening to counteract the loosening tendency under vibration. The annular boss and groove on the mating surfaces of the upper and lower housings provide an interference fit. The locking mechanism eliminates assembly gaps between the housings; simultaneously, the evenly distributed locking mechanism along the circumference ensures balanced force distribution between the upper and lower housings, preventing localized stress concentration. The elimination of the need for repeated alignment of multiple screws significantly simplifies installation, reducing the skill requirements for operators. It is particularly suitable for confined spaces or densely wired environments. The positioning platform, the pre-tightening effect of the anti-loosening spring washers, and the interference fit between the annular boss and the groove collectively enhance the structure's vibration resistance, preventing loosening under high-frequency vibration conditions such as in industrial equipment or automotive applications. The evenly distributed locking mechanism along the circumference prevents deformation of the housings due to uneven force distribution, ensuring overall structural stability.

[0021] 2. This conveniently installed DC contactor, through ceramic components and magnets, during the assembly stage, uses ceramic insulating pillars of the ceramic components to support and insulate the contact system. Rigid support prevents installation stress from being transmitted to the contact system, preventing uneven contact pressure due to stress accumulation. When the contacts break, the arc generated by the contact system is enclosed in a sealed space by the ceramic cover, preventing arc leakage. Simultaneously, the magnet generates a magnetic field perpendicular to the arc's direction of movement, exerting a directional force on the arc, pushing it quickly away from the contact surface and elongating it inside the ceramic cover. The ceramic cover and ceramic insulating pillars... All components possess high-temperature resistance and insulation properties, effectively isolating the casing from damage caused by the high temperature of the electric arc and preventing conductive interference between the contact system and other components. The supporting role of the ceramic insulating pillars reduces uneven contact caused by installation stress at the source, lowering the risk of increased contact resistance or intermittent open circuits. The magnetic field of the magnet guides the arc to extinguish quickly, while the wrapping and insulation of the ceramic cover inhibits the arc's erosion of the contact surface, reducing contact oxidation or adhesion problems and extending the service life of the contact system. The insulation properties of the ceramic components ensure the electrical safety of the contact system, preventing malfunctions caused by insulation failure. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present application. Figure 2 This is a cross-sectional structural diagram of this application; Figure 3 This is a structural schematic diagram of the intermediate cross-section of this application; Figure 4This is a structural schematic diagram showing the top cross-section of this application; Figure 5 for Figure 2 Schematic diagram of the structure at point A; Figure 6 for Figure 2 Schematic diagram of the structure at point B; Figure 7 This is a partial cross-sectional structural diagram of the connection between the upper and lower shells of this application.

[0023] In the picture: 1. Upper housing; 2. Lower housing; 3. Locking mechanism; 31. Positioning hole; 311. Positioning platform; 32. Long screw; 33. Anti-loosening spring washer; 4. Ceramic assembly; 41. Ceramic cover; 42. Ceramic insulating post; 5. Magnet; 6. Contact system; 7. Outer housing; 8. Annular boss; 9. Groove. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0025] Example 1: A DC contactor with convenient installation, refer to Figure 1 , Figure 2 and Figure 3 The device includes an upper housing 1, a lower housing 2, and a contact system 6 disposed inside the upper housing 1 and the lower housing 2. The upper housing 1 and the lower housing 2 are detachably connected by a locking mechanism 3. The locking mechanism 3 includes a long screw 32 penetrating the upper housing 1 and a positioning hole 31 opened on the lower housing 2. The positioning hole 31 is adapted to the threaded section of the long screw 32. Ceramic components 4 and magnets 5 are disposed inside the upper housing 1 and the lower housing 2. The ceramic components 4 are located on the periphery of the contact system 6, and the magnets 5 are magnetically coupled to the contact system 6. By setting up the locking mechanism 3, the detachable connection between the upper housing 1 and the lower housing 2 can be achieved simply by the adaptation of the long screw 32 and the positioning hole 31 without relying on multiple scattered screws, which greatly simplifies the installation operation. At the same time, the ceramic components 4 inside the upper housing 1 and the lower housing 2 are located on the periphery of the contact system 6, which can form basic protection for the contact system 6. The magnetic coupling between the magnets 5 and the contact system 6 provides basic conditions for arc handling, thus solving the problems of cumbersome traditional installation and insufficient contact protection.

[0026] Reference Figure 1 , Figure 2 and Figure 4The locking mechanism 3 is evenly distributed along the circumference of the upper housing 1 and the lower housing 2, with four to six sets. An outer housing 7 is fastened to the outside of the upper housing 1. The outer housing 7 is engaged with the upper housing 1 through a snap or slot. By evenly distributing the locking mechanism 3 along the circumference of the upper housing 1 and the lower housing 2, the forces exerted by the multiple sets of locking mechanisms 3 on the upper housing 1 and the lower housing 2 are balanced, avoiding local stress concentration that could lead to housing deformation. Compared with the traditional non-uniformly distributed fixing method, this method can further ensure the structural stability of the upper housing 1 and the lower housing 2 after assembly and extend the service life of the housing. By fastening the outer housing 7 to the outside of the upper housing 1, and the outer housing 7 being engaged with the upper housing 1 through a snap or slot, a double protection can be formed outside the inner housing, isolating external dust, moisture and other impurities, and protecting core components such as the internal contact system 6 and ceramic components 4. On the other hand, the snap or slot engagement facilitates the later disassembly of the outer housing 7 for maintenance, solving the problem of inconvenient disassembly and assembly of traditional external protective structures.

[0027] Reference Figure 1 , Figure 2 and Figure 3 The ceramic assembly 4 includes a ceramic cover 41 and a ceramic insulating pillar 42. The ceramic cover 41 covers the breaking area of ​​the contact system 6, and the ceramic insulating pillar 42 supports and insulates the contact system 6. The magnet 5 is a permanent magnet, symmetrically arranged along the movement direction of the contact system 6, and its magnetic field direction is perpendicular to the arc movement direction when the contacts break. By dividing the ceramic assembly 4 into the ceramic cover 41 and the ceramic insulating pillar 42: the ceramic cover 41 covers the breaking area of ​​the contact system 6, which can confine the arc generated when the contacts break to a closed space, preventing the arc from leaking out and burning the housing or surrounding components; the ceramic insulating pillar 42 supports and insulates the contact system 6. The contact system 6 not only avoids uneven contact caused by installation stress transmission to the contact system 6, but also isolates the contact system 6 from the shell from the risk of electrical conductivity, thus doubly improving the reliability of the contact system 6. By defining the magnet 5 as a permanent magnet and symmetrically arranging it along the movement direction of the contact system 6, and with its magnetic field direction perpendicular to the arc movement direction when the contact breaks, the magnetic field can generate a directional force on the arc, pushing the arc to quickly detach from the contact surface and elongate it, accelerating the arc extinguishing. Compared with ordinary magnets 5, it can more effectively suppress the arc's ablation of the contact system 6, reduce contact oxidation or adhesion, and extend the service life of the contact system 6.

[0028] Reference Figure 5 , Figure 6 and Figure 7The positioning hole 31 has a stepped structure, including a threaded section that mates with the long screw 32 and a positioning platform 311 that fits against the bottom surface of the upper housing 1. The positioning platform 311 is a stepped surface on the positioning hole 31 of the lower housing 2. The tail of the long screw 32 is fitted with an anti-loosening spring washer 33, which abuts against the top surface of the upper housing 1. The mating surfaces of the upper housing 1 and the lower housing 2 are provided with an annular boss 8 and a groove 9, which are interference-fitted. By making the positioning hole 31 a stepped structure and the positioning platform 311 a stepped surface on the positioning hole 31 of the lower housing 2, the positioning platform 311 can fit tightly against the bottom surface of the upper housing 1 during installation, directly restricting the radial displacement of the upper housing 1 and the lower housing 2, avoiding assembly misalignment, eliminating the need for repeated adjustments to the housing position, and reducing the impact on operation. To address the operator's skill requirements, an anti-loosening spring washer 33 is fitted onto the tail of the long screw 32, with the anti-loosening spring washer 33 abutting against the top surface of the upper housing 1. After tightening the long screw 32, the anti-loosening spring washer 33 generates a continuous preload force, which can counteract the loosening tendency under vibration environment. This effectively solves the problem of easy loosening of traditional screw fixings under high-frequency vibration conditions such as industrial equipment or vehicle mounting, ensuring the long-term stability of the structure. By setting an annular boss 8 and a groove 9 on the mating surface of the upper housing 1 and the lower housing 2, and the annular boss 8 and the groove 9 are interference fit, the assembly gap between the housings can be completely eliminated. Compared with traditional sealing methods such as epoxy encapsulation, it can avoid cracks in the sealing structure caused by installation torque, prevent air leakage in the arc extinguishing cavity, and further improve the breaking capacity of the DC contactor.

[0029] In this embodiment, the conveniently installed DC contactor, through the locking mechanism 3, positioning platform 311, anti-loosening spring washer 33, annular boss 8 and groove 9, eliminates the need for repeated alignment of multiple screws during installation. Simply align the long screw 32 of the upper housing 1 with the positioning hole 31 of the lower housing 2, and tighten the long screw 32 to fit and lock the threaded section into the positioning hole 31. At this time, the positioning platform 311 on the positioning hole 31 fits tightly against the bottom surface of the upper housing 1, restricting radial displacement between the upper housing 1 and the lower housing 2 and preventing misalignment. The anti-loosening spring washer 33 at the tail of the long screw 32 abuts against the top surface of the upper housing 1, generating a continuous preload after tightening to counteract the loosening tendency under vibration. The annular boss 8 and the groove 9 on the mating surface are interference-fitted to eliminate the assembly gap between the shells; at the same time, the locking mechanism 3 is evenly distributed around the circumference, so that the upper shell 1 and the lower shell 2 are subjected to balanced forces, avoiding local stress concentration; there is no need to repeatedly align multiple screws, which greatly simplifies the installation operation and reduces the requirements for the operator's proficiency. It is especially suitable for narrow spaces or dense wiring scenarios. The positioning function of the positioning table 311, the pre-tightening function of the anti-loosening spring washer 33, and the interference fit between the annular boss 8 and the groove 9 together improve the structure's vibration resistance and prevent loosening under high-frequency vibration conditions such as industrial equipment or vehicle-mounted equipment. The evenly distributed locking mechanism 3 around the circumference prevents the shell from deforming due to uneven force and ensures the overall structural stability.

[0030] The implementation principle of this application embodiment is as follows: During installation, the upper housing 1 and the lower housing 2 are first aligned, so that the long screw 32 preset on the upper housing 1 is aligned with the positioning hole 31 of the lower housing 2; at this time, the positioning platform 311 in the positioning hole 31 is initially attached to the bottom surface of the upper housing 1, directly limiting the radial offset between the upper housing 1 and the lower housing 2, and accurate alignment can be completed without repeatedly adjusting the housing position; the long screw 32 is screwed so that its thread section is fitted and locked with the thread section of the positioning hole 31, causing the upper housing 1 and the lower housing 2 to gradually fit together; as the long screw 32 is tightened, the anti-loosening spring washer 33 fitted at its tail is compressed and resists The upper housing 1 is attached to the top surface, generating a continuous pre-tightening force to prevent loosening under subsequent vibration. At the same time, the annular boss 8 and groove 9 on the mating surface of the upper housing 1 and the lower housing 2 form an interference fit, eliminating the assembly gap between the housings and achieving a preliminary seal. Because the locking mechanism 3 is evenly distributed along the circumference of the upper housing 1 and the lower housing 2, the cooperation of multiple sets of long screws 32 with the positioning holes 31 makes the upper housing 1 and the lower housing 2 bear forces evenly, avoiding local stress concentration that could lead to housing deformation. Finally, the outer housing 7 is fastened to the outside of the upper housing 1 through a buckle or slot to complete the overall assembly, forming a dual structure of "internal core component protection + external dustproof and impact-resistant".

[0031] When the DC contactor is energized, the internal ceramic component 4 plays a crucial role: the ceramic insulating column 42 provides rigid support for the contact system 6 located inside the upper housing 1 and the lower housing 2, preventing displacement of the contact system 6 due to vibration or installation stress, and ensuring the stability of the contact position of the stationary and moving contacts; at the same time, the insulating properties of the ceramic insulating column 42 isolate the contact system 6 from the conductive risks of the upper housing 1 and the lower housing 2, ensuring electrical safety; when the contact system 6 breaks the circuit, an electric arc will be generated at the moment of separation of the stationary and moving contacts: the ceramic cover 41 covers the breaking area of ​​the contact system 6, confining the electric arc in a sealed space, preventing the electric arc from leaking out and burning the housing or surrounding components; Simultaneously, the magnets 5, symmetrically arranged along the movement direction of the contact system 6, generate a directional magnetic field. The direction of the magnetic field is perpendicular to the direction of arc movement, exerting a lateral force on the arc, pushing the arc to quickly detach from the contact surface and elongate into the ceramic cover 41, accelerating the arc extinguishing and reducing the arc's erosion of the contact surface. The continuous preload of the anti-loosening spring washer 33 and the interference fit of the annular boss 8 and groove 9 ensure that the housing remains loose and without gaps during long-term operation, preventing air leakage in the arc extinguishing cavity that could lead to a decrease in breaking capacity. The outer housing 7 isolates external dust, moisture, and other impurities, protecting the internal ceramic components 4, magnets 5, and contact system 6 from environmental interference and extending the overall service life.

Claims

1. A DC contactor for easy installation, comprising an upper housing (1), a lower housing (2), and a contact system (6) disposed inside the upper housing (1) and the lower housing (2), characterized in that: The upper housing (1) and the lower housing (2) are detachably connected by a locking mechanism (3). The locking mechanism (3) includes a long screw (32) penetrating the upper housing (1) and a positioning hole (31) opened on the lower housing (2). The positioning hole (31) is adapted to the threaded section of the long screw (32). The upper housing (1) and the lower housing (2) are provided with a ceramic component (4) and a magnet (5). The ceramic component (4) is located on the periphery of the contact system (6). The magnet (5) is magnetically coupled to the contact system (6).

2. The DC contactor with convenient installation according to claim 1, characterized in that: The locking mechanism (3) is evenly distributed along the circumference of the upper shell (1) and the lower shell (2), and the number is four to six sets.

3. The DC contactor with convenient installation according to claim 1, characterized in that: An outer shell (7) is fastened to the outside of the upper shell (1), and the outer shell (7) and the upper shell (1) are engaged by a snap or a slot.

4. The DC contactor with convenient installation according to claim 1, characterized in that: The ceramic assembly (4) includes a ceramic cover (41) and a ceramic insulating post (42), the ceramic cover (41) covering the breaking area of ​​the contact system (6) and the ceramic insulating post (42) supporting and insulating the contact system (6).

5. The DC contactor with convenient installation according to claim 1, characterized in that: The magnet (5) is a permanent magnet, which is symmetrically arranged along the movement direction of the contact system (6), and its magnetic field direction is perpendicular to the arc movement direction when the contact is broken.

6. The DC contactor with convenient installation according to claim 1, characterized in that: The positioning hole (31) has a stepped structure, including a threaded section that mates with a long screw (32) and a positioning platform (311) that fits against the bottom surface of the upper housing (1). The positioning platform (311) is a stepped surface on the positioning hole (31) of the lower housing (2).

7. The DC contactor with convenient installation according to claim 1, characterized in that: The tail of the long screw (32) is fitted with an anti-loosening spring washer (33), which abuts against the top surface of the upper housing (1).

8. The DC contactor with convenient installation according to claim 1, characterized in that: The mating surfaces of the upper shell (1) and the lower shell (2) are provided with an annular boss (8) and a groove (9), and the annular boss (8) and the groove (9) are interference fit.

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