A contactor

Abstract

The utility model discloses a contactor, belonging to the technical field of contactors, comprising: a contactor body, a liquid cooling component is arranged on the contactor body; the liquid cooling component is arranged outside a magnetic system component; the liquid cooling component comprises: a resistance element; a liquid for soaking the resistance element and cooling it; a container for containing the liquid; the contactor is a contactor with a self-contained liquid cooling buffer to provide pre-charging for a capacitor, is used to provide a controllable charging current in the capacitor pre-charging stage, and reduces the temperature rise of a resistance wire or an enameled wire when a high current passes through it through liquid cooling, thereby improving the safety of pre-charging and the service life of the contactor.

Description

Technical Field

[0001] The utility model belongs to the technical field of contactors, and in particular relates to a contactor with self-contained liquid cooling buffer. Background Art

[0002] In the inverter industry, there is a large capacitor in the inverter main circuit. The capacitor needs to be charged at the initial power-on stage. If it is not restricted, the charging current will be too large, which will cause a great impact on the power supply and rectifier components. Therefore, a buffer resistor is installed in the inverter main circuit to suppress the power-on impact current. The maximum value of the impact current is: I=540 / R (540V is the normal DC bus voltage of a 380V inverter). The charging circuit is an RC circuit. The RC circuit time cannot be too long. Too long a time will cause the charging current to drop slowly, resulting in a large average power of the resistor, unnecessary loss and excessive power-on time.

[0003] At present, in order to prevent the charging current of the capacitor from being too large, inverter manufacturers need to re-connect resistors in the inverter to suppress the current shock of power-on. The resistors generate heat during the charging process, resulting in a decrease in work efficiency. Therefore, it is necessary to develop a new contactor to solve the problem of resistor overheating during the charging process. Utility Model Content

[0004] The utility model aims to provide a contactor to solve the problem of heating of the resistor during the charging process.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a contactor, comprising a contactor body, wherein a liquid cooling component is arranged on the contactor body;

[0006] The liquid cooling component is arranged outside the magnetic system assembly;

[0007] The liquid cooling component includes: a resistance element;

[0008] a liquid for soaking the resistive element and cooling it;

[0009] A container for holding the liquid.

[0010] Preferably, the container comprises:

[0011] a liquid-cooled inner shell mounted on the periphery of the magnetic system assembly;

[0012] A liquid-cooled outer shell mounted on the outer periphery of the liquid-cooled inner shell;

[0013] The liquid-cooled inner shell is provided with an inlay connected to the resistor element, the inlay is connected to the wire; the wire is connected to the bolt; the wire is connected to an external capacitor to form an RC loop.

[0014] Preferably, the container comprises:

[0015] a liquid-cooled inner shell mounted on the periphery of the magnetic system assembly;

[0016] A liquid-cooled outer shell mounted on the outer periphery of the liquid-cooled inner shell;

[0017] The liquid-cooled inner shell is provided with an inlay connected to the resistor element, the inlay is connected to the wire; the wire is connected to the bolt; the wire is connected to an external capacitor C to form an RC circuit.

[0018] Preferably, a seal is provided between the liquid-cooled inner shell and the liquid-cooled outer shell.

[0019] Preferably, the resistance element is a resistance wire or an enameled wire.

[0020] Preferably, the contactor body comprises:

[0021] Contact assembly;

[0022] An iron core assembly connected to the contact assembly;

[0023] A magnetic system assembly for causing displacement of the core assembly;

[0024] A housing used to protect contact assemblies.

[0025] Preferably, the contact assembly comprises:

[0026] static touch panel;

[0027] A moving touch panel cooperates with the stationary touch panel.

[0028] Preferably, the magnetic system components include:

[0029] Wire sheathing;

[0030] A coil frame accommodated in the wire sheath cavity;

[0031] The coil is wound on a coil frame.

[0032] Magnetic system components include electric holding system and magnetic holding system, etc.

[0033] Preferably, the core assembly comprises:

[0034] Moving iron core;

[0035] A linkage rod connected to the contact assembly;

[0036] A static iron core is used to attract the moving iron core.

[0037] Preferably, the housing comprises:

[0038] A dust cover and an upper plate connected to the dust cover.

[0039] The technical effects and advantages of the utility model are as follows: the contactor has its own liquid cooling buffer to provide pre-charging for the capacitor, is used to provide a controllable charging current in the capacitor pre-charging stage, and uses liquid cooling to reduce the temperature rise of the resistance wire or enameled wire when high current passes through, thereby improving the safety of pre-charging and the service life of the contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a cross-sectional view of the utility model;

[0041] Figure 2 This is a structural diagram of the liquid cooling component of the utility model;

[0042] Figure 3 This is a structural diagram of the contact bridge bracket assembly of the utility model;

[0043] Figure 4 This is a structural diagram of the iron core assembly of the utility model;

[0044] Figure 5 It is a structural diagram of the magnetic system components of the utility model;

[0045] Figure 6 It is a front view of the utility model;

[0046] Figure 7 It is a three-dimensional diagram of the utility model;

[0047] Figure 8 This is a three-dimensional diagram of the utility model without the dust cover assembly installed;

[0048] Fig. 9 This is the wiring schematic diagram of the utility model.

[0049] In the figure: 101, dust cover; 102, bolt; 103, static contact plate; 104, upper plate; 105, mounting plate; 106, liquid cooling component; 107, contact bridge bracket assembly; 108, core assembly; 109, magnetic system assembly; 110, contactor body; 106-1, fastener; 106-2, liquid cooling inner shell; 106-3, seal; 106-4, liquid cooling outer shell; 106-5, inlay; 106- 6. Resistor element; 106-7. Liquid; 106-8. Wire; 107-1. Fastening screw; 107-2. Rivet; 107-3. Bracket; 107-4. Main contact bridge spring; 107-5. Moving contact plate; 108-1. Linking rod; 108-2. Moving iron core; 109-1. Fastening bolt; 109-2. Wire sheath; 109-3. Coil frame; 109-4. Coil; 109-5. Magnet. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0051] The utility model provides Figure 1 , Figure 6 , Figure 7 A contactor shown in , comprises a contactor body 110, and the contactor body 110 comprises: a contact assembly;

[0052] Dust cover 101;

[0053] A core assembly 108 connected to the contact assembly;

[0054] A magnetic system assembly 109 for displacing the core assembly 108;

[0055] A liquid cooling component 106 is disposed outside the magnetic system assembly 109 .

[0056] The type of the magnetic system component 109 is a magnetic holding coil or an electric holding coil, etc.;

[0057] The contactor body 110 is provided with a liquid cooling component 106, such as Figure 2 As shown, the liquid cooling component 106 includes:

[0058] Resistor element 106-6;

[0059] Liquid 106-7 for soaking the resistor element 106-6 and cooling it;

[0060] A container for holding the liquid 106 - 7 .

[0061] The container comprises:

[0062] A liquid-cooled inner shell 106 - 2 mounted on the outer periphery of the magnetic system assembly 109 ;

[0063] A liquid-cooled outer shell 106 - 4 mounted on the outer periphery of the liquid-cooled inner shell 106 - 2;

[0064] The liquid-cooled inner shell 106-2 is provided with an inlay 106-5 connected to the resistor element 106-6, the inlay 106-5 is connected to the wire 106-8; the wire 106-8 is connected to the bolt 102; the wire 106-8 is connected to an external capacitor C to form an RC circuit.

[0065] The liquid 106-7 is in the container, and the resistor element 106-6 is immersed in the liquid 106-7; it is used to provide a controllable charging current in the capacitor pre-charging stage, and cool the resistor element 106-6 through the liquid 106-7 to reduce the temperature rise of the resistor element 106-6 when a high current passes through, thereby improving the safety of pre-charging and the service life of the contactor;

[0066] When the main circuit is closed, the contact of the moving touch plate 107-5 is kept open first, and the current passes through the RC circuit, that is, the wire 106-8, the inlay 106-5, and the resistance element 106-6 to charge the external capacitor C; after the charging is completed, the contact of the moving touch plate 107-5 is closed, so that the main circuit operates normally;

[0067] The liquid 106 - 7 in the liquid cooling component 106 plays a role in cooling down during the charging process, preventing the resistor element 106 - 6 from overheating due to the passage of current;

[0068] The container has an inlay 106-5 connected to one end of the wire 106-8, and the other end of the wire 106-8 is connected to the bolt 102. The container includes a liquid-cooled inner shell 106-2 and a liquid-cooled outer shell 106-4, and a seal 106-3 is provided between the two for sealing the liquid 106-7 to prevent the liquid 106-7 from flowing out;

[0069] The contactor body 110 is connected to the liquid cooling component 106 by fasteners 106 - 1 , and the fasteners 106 - 1 include but are not limited to screws, flat washers, spring washers and nuts;

[0070] like Figure 5 As shown, the magnetic system component 109 includes:

[0071] Wire sheath 109-2;

[0072] A coil skeleton 109-3 accommodated in the cavity of the wire sheath 109-2;

[0073] The coil 109-4 is wound on the coil frame 109-3;

[0074] Magnets 109-5 disposed at both ends of the coil frame 109-3;

[0075] A magnetically conductive washer 109 - 4 is sleeved on the core assembly 108 and in contact with the magnet 109 - 5 .

[0076] The wire sheath 109-2 is a hollow cylindrical structure with an opening at the upper end, and the opening extends outward to form an extension, and a fastening bolt 109-1 is provided on the extension;

[0077] The magnet 109 - 5 is located at the upper and lower ends of the coil frame 109 - 3 .

[0078] The contact assembly comprises:

[0079] The stationary contact plate 103; bolts 102 are respectively provided on the stationary contact plate 103;

[0080] A contact bridge support assembly 107 that cooperates with the stationary contact plate 103;

[0081] The contact bridge support assembly 107 includes:

[0082] Bracket 107-3;

[0083] A moving touch plate 107 - 5 that is separated from or in contact with the stationary touch plate 103 and connected to the bracket 107 - 3 via a main contact bridge spring 107 - 4 ;

[0084] Among them, Figure 3 , Figure 8 As shown, the bracket 107-3 is provided with two cavities for installing the main contact bridge spring 107-4, and the main contact bridge spring 107-4 is fixed to the upper wall of the cavity of the bracket 107-3 by a rivet 107-2, and the rivet 107-2 penetrates the main contact bridge spring 107-4 and is connected to the moving contact plate 107-5; the center point of the bracket 107-3 is connected to the core assembly 108 by a fastening screw 107-1;

[0085] The fastening screw 107 - 1 and the two rivets 107 - 2 are arranged in the same straight line, so that the moving touch plates 107 - 5 are arranged in parallel;

[0086] Symmetrical limiting grooves are respectively provided on the two side surfaces of the bracket 107 - 3 , and the limiting grooves match the limiting columns of the upper plate 104 .

[0087] The number of the movable touch plates 107-5 is two. The liquid-cooled inner shell 106-2 is a hollow cylindrical structure with an opening at the upper end, and its upper end surface extends outward and then upward to form an L-shaped extension, and two inlays 106-5 are arranged on the L-shaped extension. The two inlays 106-5 are located in the cavity formed by the liquid-cooled inner shell 106-2 and the liquid-cooled outer shell 106-4 after the L-shaped extension; the liquid-cooled outer shell 106-4 is a hollow cylindrical structure with an opening at the upper end, and its upper end extension extends outward and then upward to connect with the outer end of the liquid-cooled inner shell 106-2. A dustproof or waterproof seal 106-3 is provided between the upper end surface of the liquid-cooled outer shell 106-4 and the lower end surface of the L-shaped extension of the liquid-cooled inner shell 106-2. The resistor element 106-6 is wound around the outer wall of the liquid-cooled inner shell 106-2. A fastener 106-1 is provided on the upper end surface of the liquid-cooled inner shell 106-2 and connected to the mounting plate 105. One end of the wire 106-8 is connected to the inlay 106-5, and the other end of the wire 106-8 is connected to the bolt 102.

[0088] like Figure 4 As shown, the core assembly 108 includes:

[0089] A linkage rod 108-1 connected to the contact assembly;

[0090] and a moving iron core 108 - 2 connected to the linkage rod 108 - 1;

[0091] The static contact plate 103 is fixed to the upper end surface of the upper plate 104, the dust cover 101 is fixed to the upper end of the upper plate 104, one end of the wire 106-8 is connected to the insert 106-5, and the other end is connected to the bolt 102, the lower end of the contact bridge bracket assembly 107 is fixed to the upper end of the core assembly 108, the lower end of the mounting plate 105 is tightly attached to the upper end of the magnetic system assembly 109 and fixed to the lower end of the upper plate 104, the liquid-cooled inner shell 106-2 is fixed to the upper plate 104 after being tightly attached to the mounting plate 105, the lower end of the liquid-cooled component 106 is fixed to the lower end of the magnetic system assembly 109 with a fastener 106-1, the core assembly 108 is in the middle of the magnetic system assembly 109, the contact bridge bracket assembly 107 is above the upper plate 104, and the contact bridge bracket assembly 107 is inside the dust cover 101.

[0092] When the inverter is in use, the main circuit is closed, the contact of the moving touch plate 107-5 is disconnected, and the current passes through the RC circuit, that is, the wire 106-8, to the inlay 106-5, the resistor element 106-6 to reach the external capacitor C, and the external capacitor C is charged; after the charging is completed, the contact of the moving touch plate 107-5 is closed, resulting in a short circuit in the RC circuit, and the main circuit operates normally. During the charging process, the liquid 106-7 plays a cooling role, preventing the temperature of the resistor element 106-6 from being too high, and plays a cooling role; the seal 106-3 is used for dust or water proof parts to prevent the liquid 106-7 from flowing out to ensure the stable operation of the liquid cooling system;

[0093] When the coil 109-4 is energized, the coil 109-4 generates a magnetic field, causing the moving iron core 108-2 to generate an electromagnetic attraction. The moving iron core 108-2 is attracted downward by the magnet 109-5 and its magnetic properties, and the contact bridge bracket assembly 107 is driven to operate: the normally open contact is closed;

[0094] When the coil 109-4 is energized again, the coil 109-4 will generate a current in the opposite direction to the pull-in current. Similarly, the coil 109-4 generates a magnetic field, which causes the moving iron core 108-2 to generate an electromagnetic attraction. By using the magnet 109-5 and its magnetic properties, the moving iron core 108-2 is pulled upward and drives the contact bridge bracket assembly 107 to recover: the normally open contact is disconnected;

[0095] Fig. 9 In the figure: A1 and A2 are coil terminals; L1 and L2 are main circuit terminals; C is an external capacitor; R is the resistor element 106-6.

[0096] The contactor has its own liquid cooling buffer to provide pre-charging for the capacitor. It is used to provide a controllable charging current in the capacitor pre-charging stage and reduce the temperature rise of the resistance wire or enameled wire when high current passes through it through liquid cooling, thereby improving the safety of pre-charging and the service life of the contactor.

[0097] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A contactor, comprising a contactor body (110), characterized in that: The contactor body (110) is provided with a liquid cooling component (106); The liquid cooling component (106) comprises: a resistance element (106-6); Liquid (106-7) for soaking the resistance element (106-6) and cooling it; A container for holding the liquid (106-7).

2. A contactor according to claim 1, characterized in that: The container comprises: Liquid-cooled inner shell (106-2); A liquid-cooling outer shell (106-4) mounted on the outer periphery of the liquid-cooling inner shell (106-2); The liquid-cooled inner shell (106-2) is provided with an inlay (106-5) connected to the resistance element (106-6); the inlay (106-5) is connected to a wire (106-8); the wire (106-8) is connected to a bolt (102); and the wire (106-8) is connected to an external capacitor C to form an RC circuit.

3. A contactor according to claim 2, characterized in that: A sealing member (106-3) is provided between the liquid-cooling inner shell (106-2) and the liquid-cooling outer shell (106-4).

4. A contactor according to claim 1, characterized in that: The resistance element (106-6) is a resistance wire or an enameled wire.

5. A contactor according to claim 1, characterized in that: The contactor body (110) comprises: Contact assembly; An iron core assembly (108) connected to the contact assembly; A magnetic system assembly (109) for causing the core assembly (108) to displace; A housing used to protect contact assemblies.

6. A contactor according to claim 5, characterized in that: The contact assembly comprises: Static touch panel(103); Moving touch panel (107-5).

7. A contactor according to claim 5, characterized in that: The core assembly (108) comprises: Moving iron core (108-2); A linkage rod (108-1) connected to the contact assembly; Static iron core.

8. A contactor according to claim 5, characterized in that: The housing comprises: Dust cover (101), upper plate (104).

9. A contactor according to claim 5, characterized in that: The magnetic system component (109) comprises: Wire sheath (109-2); A coil frame (109-3) accommodated in the cavity of the wire sheath (109-2); A coil (109-4) is wound around a coil frame (109-3).

10. The contactor according to any one of claims 5 to 9, characterized in that: The magnetic system component (109) is of the type of an electric holding system or a magnetic holding system.

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