A contactor

Abstract

The utility model discloses a contactor, belonging to the technical field of contactors, comprising: a contactor body; and a heat dissipation buffer resistor component connected to the contactor body; the heat dissipation buffer resistor component comprises: a shell connected to the contactor body; a heat sink accommodated in the shell; a resistor element wound on the heat sink and connected to the contactor body; the contactor and a control method are used for direct current switching, and solve the problems that the charging resistor and a static contact plate are not easy to connect, and the charging resistor is not easy to fix; the resistor element is wound on the heat sink, and the heat is dissipated by contacting with the heat sink over a large area. When charging a large capacitor in frequency conversion, the frequency converter factory does not need to install a charging resistor, can suppress the charging current, protect the power supply and the rectifier element, and is safer and faster to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of contactors, and in particular relates to a contactor. Background Art

[0002] In the inverter industry, there are large capacitors in the inverter main circuit. The capacitors need to be charged at the beginning of power-on. If there is no limit, the charging current will be too large, which will cause a great impact on the power supply and rectifier components. Therefore, a charging 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 voltage of the DC bus of the 380V inverter), so the bus current must be less than the input rated current of the inverter. As the voltage of the capacitor gradually increases, the charging current will gradually decrease until it is theoretically 0. The charging circuit is an RC circuit. The RC circuit time cannot be too long. Too long time will cause the charging current to drop slowly, resulting in a large average power of the resistor, unnecessary loss and too long power-on time.

[0003] In order to prevent the charging current of the capacitor from being too large, the inverter manufacturer needs to re-connect the resistor in the inverter to suppress the current shock of power-on. The best place to install the charging resistor is between the static contact plates of the contactor. However, it is difficult to connect the charging resistor and the static contact plates, and the charging resistor is not easy to fix, which has a certain impact on the user's use of the inverter. Therefore, it is necessary to develop a new contactor to solve the existing problem. Summary of the invention

[0004] The utility model aims to provide a contactor to solve the problem of reduced efficiency caused by heat during charging.

[0005] In order to achieve the above object, the utility model provides the following technical solution: a contactor, comprising:

[0006] Contactor body;

[0007] and a heat dissipation buffer resistor assembly connected to the contactor body;

[0008] The heat dissipation buffer resistor component comprises:

[0009] A housing connected to the contactor body;

[0010] a heat sink accommodated in the housing;

[0011] A resistor element is wound around the heat sink and connected to the contactor body.

[0012] Preferably, the magnetic latching contactor comprises:

[0013] A wire connected to the resistor element

[0014] a stationary contact plate connected to the other end of the wire;

[0015] a moving touch panel matching the stationary touch panel;

[0016] A contact bridge bracket for assembling the moving contact plate;

[0017] A linkage rod connected to the contact bridge bracket;

[0018] A moving iron core connected to the linkage rod;

[0019] A hollow coil disposed on the periphery of the moving iron core;

[0020] A first permanent magnet and a second permanent magnet mounted at two ends of the hollow coil;

[0021] An energy-saving board with the hollow coil;

[0022] A magnetically conductive washer in conflict with the second permanent magnet;

[0023] a magnetic conductive plate in contact with the magnetic conductive gasket;

[0024] A wire casing is used to accommodate the hollow coil.

[0025] Preferably, the contact bridge bracket mounts the moving contact plate via a contact spring.

[0026] Preferably, the electrical holding contactor comprises:

[0027] A wire connected to the resistor element

[0028] a stationary contact plate connected to the other end of the wire;

[0029] a moving touch panel matching the stationary touch panel;

[0030] A contact bridge bracket for assembling the moving contact plate;

[0031] A linkage rod connected to the contact bridge bracket;

[0032] A moving iron core connected to the linkage rod;

[0033] A reaction spring that contacts the moving iron core;

[0034] A static iron core that contacts the reaction spring;

[0035] A hollow coil disposed on the periphery of the static iron core and the moving iron core;

[0036] A wire casing for accommodating the hollow coil;

[0037] Wherein, the contact bridge bracket is assembled with the moving contact plate through a contact spring.

[0038] The technical effects and advantages of the utility model are as follows: the contactor is used for direct current switching, and solves the problem that the charging resistor and the static contact plate are difficult to connect, and the charging resistor is difficult to fix; a heat sink is used to help the resistance element wound on the heat sink to dissipate heat; when charging a large capacitor in the inverter, the inverter factory does not need to install a charging resistor, which can suppress the charging current, protect the power supply and the rectifier element, and is safer and faster to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is the front view of the contactor of the utility model;

[0040] Figure 2 It is a right side view of the contactor of the utility model;

[0041] Figure 3 For this utility model Figure 1 The middle contactor body is a cross-sectional view of the AA plane of magnetic retention;

[0042] Figure 4 For this utility model Figure 1 The cross-sectional view of the AA plane of the contactor body for electrical retention;

[0043] Figure 5 For this utility model Figure 2 Sectional view of the middle BB plane;

[0044] Figure 6 It is a structural schematic diagram of the heat dissipation buffer resistor component in the utility model;

[0045] Figure 7 It is a three-dimensional diagram of the contactor of the utility model;

[0046] Figure 8 This is a schematic diagram of the structure of the contactor of the utility model without the housing installed;

[0047] Fig. 9 The utility model is a wiring schematic diagram of the contactor of the utility model.

[0048] In the figure: 101, housing; 102, energy-saving board; 103, first screw; 104, heat sink; 105, resistor element; 106, wire shell; 107, hollow coil; 108, magnetic gasket; 109, first permanent magnet; 109-1, second permanent magnet; 110, moving iron core; 111, second screw; 112, connecting rod; 113, magnetic plate; 114, upper plate; 115, M10 nut assembly; 116-1, static touch plate; 116-2, dynamic touch plate; 117, dust cover; 118, dustproof part; 119, contact bridge bracket; 120, third screw; 121, fourth screw; 122, static iron core; 123, reaction spring; 124, contact spring; 125, wire; 201, contactor body; 202, heat dissipation buffer resistor assembly. DETAILED DESCRIPTION

[0049] 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.

[0050] Embodiment 1:

[0051] The utility model provides Figure 1 , Figure 2 , Figure 5 A contactor is shown, comprising:

[0052] Contactor body 201;

[0053] and a heat dissipation buffer resistor assembly 202 connected to the contactor body 201;

[0054] The heat dissipation buffer resistor component 202 includes:

[0055] A housing 101 connected to the contactor body 201;

[0056] A heat sink 104 accommodated in the housing 101;

[0057] A resistor element 105 wound around the heat sink 104 and connected to the contactor body 201;

[0058] In this embodiment, Figure 6 , Figure 7 , Figure 8 , Fig. 9As shown, the buffer resistor assembly includes a resistor element 105, a housing 101 and a heat sink 104, the resistor element 105 is wound around the heat sink 104, the heat sink 104 is placed inside the housing 101, the housing 101 is connected and fixed to the lower end portion of the contactor body 201, the resistor element 105 is connected to the two stationary contact plates 116-1 by a wire 125; the contactor body 201 can be any one of a magnetic holding contactor and an electric holding contactor;

[0059] The magnetic latching contactor comprises:

[0060] A wire 125 connected to the resistor element 105;

[0061] A stationary contact plate 116-1 connected to the other end of the wire 125;

[0062] A moving touch panel 116 - 2 matched with the stationary touch panel 116 - 1 ; the moving touch panel 116 - 2 is a bridge-shaped touch panel;

[0063] A contact bridge bracket 119 for assembling the movable contact plate 116 - 2 ; the contact bridge bracket 119 is an aluminum bracket;

[0064] A linkage rod 112 connected to the contact bridge bracket 119;

[0065] A moving iron core 110 connected to the linkage rod 112;

[0066] A hollow coil 107 disposed on the periphery of the moving iron core 110;

[0067] A first permanent magnet 109 and a second permanent magnet 109 - 1 mounted at both ends of the hollow coil 107 ;

[0068] The energy-saving plate 102 with the hollow coil 107; the energy-saving plate 102 is fixed to the housing 101 by a first screw 103

[0069] A magnetically conductive washer 108 that conflicts with the second permanent magnet 109 - 1 ;

[0070] A magnetic conductive plate 113 in contact with the magnetic conductive gasket 108;

[0071] A wire casing 106 for accommodating the hollow coil 107;

[0072] The contact bridge bracket 119 is used to mount the moving contact plate 116 - 2 via the contact spring 124 ;

[0073] In this embodiment, Figure 3As shown, the upper end of the wire sheath 106 is connected to the lower end of the upper plate 114, the upper end of the upper plate 114 is connected to the dust cover 117, a dust cover 118 is provided between the dust cover 117 and the upper plate 114, the hollow coil 107 is placed in the wire sheath 106, the second permanent magnet 109-1 and the first permanent magnet 109 are placed at the upper and lower ends of the hollow coil 107, the moving iron core 110 is placed in the hollow coil 107, and the moving iron core 110 is connected to the lower end of the linkage rod 112 The moving iron core 110 is fixed to the linkage rod 112 by the second screw 111, the moving contact plate 116-2 is placed inside the contact bridge bracket 119, the contact bridge bracket 119 is connected to the upper end of the linkage rod 112, and the contact bridge bracket 119 is connected to the linkage rod 112 by the third screw 120; the housing 101 is connected to the contactor body 201 by the fourth screw 121; the two stationary contact plates 116-1 are respectively provided with M10 nut assemblies 115; the upper plate 114 integrates a bent plate;

[0074] Working principle:

[0075] When the hollow coil 107 is powered off, the second permanent magnet 109 - 1 causes the moving iron core 110 to be adsorbed on the magnetic conductive plate 113 ;

[0076] When the hollow coil 107 is energized, the hollow coil 107 generates the same magnetic field as the first permanent magnet 109 and attracts the moving iron core 110 with the first permanent magnet 109, driving the moving contact plate 116-2 to move: the normally open contact is closed;

[0077] When the hollow coil 107 is de-energized, the moving contact plate 116 - 2 remains switched on due to the magnetic field of the first permanent magnet 109 ;

[0078] When the hollow coil 107 is energized in the reverse direction, it generates the same magnetic field as the second permanent magnet 109-1 and together with the second permanent magnet 109-1 attracts the moving iron core 110 to the magnetic conductive plate 113, driving the moving contact plate 116-2 to move: the normally open contact is disconnected;

[0079] In this embodiment, when no power is supplied, the moving iron core 110 is affected by the magnetic field of the second permanent magnet 109-1 and is adsorbed on the magnetic conductive plate 113 together; when the coil is energized, the hollow coil 107 generates the same magnetic field as the first permanent magnet 109, and together with the first permanent magnet 109, attracts the moving iron core 110 from the top to the bottom, and drives the moving touch plate 116-2 to operate: the normally open contact is closed; when the hollow coil 107 is powered off, the moving touch plate 116-2 will not be disconnected due to the magnetic field of the first permanent magnet 109; when the hollow coil 107 is powered in the reverse direction, it generates the same magnetic field as the upper magnet, and together with the second permanent magnet 109-1, attracts the moving iron core 110 to the magnetic conductive plate 113, and drives the moving touch plate 116-2 to operate: the normally open contact is disconnected;

[0080] When the frequency converter is in use, the main circuit is closed, the main contacts of the contactor are disconnected, and the current charges the capacitor through the buffer resistor component. After charging is completed, the main contacts of the contactor are closed, the circuit where the buffer resistor is located is short-circuited, and the main circuit operates normally.

[0081] Embodiment 2:

[0082] The magnetic latching contactor in the first embodiment is replaced by an electric latching contactor, which includes:

[0083] A wire 125 connected to the resistor element 105;

[0084] A stationary contact plate 116-1 connected to the other end of the wire 125;

[0085] A moving touch panel 116 - 2 matched with the stationary touch panel 116 - 1;

[0086] A contact bridge bracket 119 for assembling the moving contact plate 116 - 2;

[0087] A linkage rod 112 connected to the contact bridge bracket 119;

[0088] A moving iron core 110 connected to the linkage rod 112;

[0089] A reaction spring 123 that contacts the moving iron core 110;

[0090] A static iron core 122 that conflicts with the reaction spring 123;

[0091] A hollow coil 107 disposed outside the static iron core 122 and the moving iron core 110;

[0092] A wire casing 106 for accommodating the hollow coil 107;

[0093] The contact bridge support 119 is assembled with the moving contact plate 116 - 2 via a contact spring 124 .

[0094] In this embodiment, Figure 4 As shown, the static iron core 122 and the moving iron core 110 are both arranged in the hollow coil 107, the reaction spring 123 is arranged between the static iron core 122 and the moving iron core 110, the lower end of the connecting rod 112 is connected to the moving iron core 110, and the moving touch plate 116-2 is placed inside the touch bridge bracket 119, and the touch bridge bracket 119 is connected to the upper end of the connecting rod 112.

[0095] Working principle: When the hollow coil 107 is energized, the static iron core 122 generates electromagnetic attraction, and the moving iron core 110 overcomes the elastic force of the reaction spring 123 and approaches the static iron core 122, and at the same time drives the linkage rod 112 to move downward, and the linkage rod 112 drives the moving touch plate 116-2 to move: the normally open contact is closed;

[0096] When the hollow coil 107 is powered off, the electromagnetic attraction generated by the static iron core 122 disappears, and the reaction force of the reaction spring 123 bounces the moving iron core 110 away, and at the same time drives the linkage rod 112 to move upward, and the linkage rod 112 drives the moving touch plate 116-2 to move: the normally open contact is disconnected;

[0097] In this embodiment, when the hollow coil 107 is energized, the static iron core 122 generates electromagnetic attraction, and the moving iron core 110 overcomes the elastic force of the reaction spring 123 and approaches the static iron core 122, while driving the linkage rod 112 downward, and the linkage rod 112 drives the moving touch plate 116-2 to move: the normally open contact is closed; when the hollow coil 107 is de-energized, the electromagnetic attraction generated by the static iron core 122 disappears, and the reaction force of the reaction spring 123 bounces the moving iron core 110 open, while driving the linkage rod 112 upward, and the linkage rod 112 drives the moving touch plate 116-2 to move: the normally open contact is disconnected.

[0098] When the frequency converter is in use, the main circuit is closed, the main contacts of the contactor are disconnected, and the current charges the capacitor through the heat dissipation resistor component. After charging is completed, the main contacts of the contactor are closed, the circuit where the buffer resistor is located is short-circuited, and the main circuit operates normally.

[0099] 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 a resistor element 105.

[0100] 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 (201), characterized in that: The contactor body (201) is provided with a heat dissipation buffer resistor component (202); The heat dissipation buffer resistor component (202) comprises: A housing (101) connected to the contactor body (201); A heat sink (104) accommodated in the housing (101); A resistance element (105) wound around the heat sink (104) and connected to the contactor body (201).

2. A contactor according to claim 1, characterized in that: The contactor body (201) is a magnetic latching contactor, which comprises: A wire (125) connected to the resistor element (105) A stationary touch plate (116-1) connected to the other end of the wire (125); A movable touch panel (116-2) matched with the stationary touch panel (116-1); A contact bridge bracket (119) for assembling the moving contact plate (116-2); A linkage rod (112) connected to the contact bridge bracket (119); A moving iron core (110) connected to the linkage rod (112); A hollow coil (107) disposed on the periphery of the moving iron core (110); A first permanent magnet (109) and a second permanent magnet (109-1) mounted on both ends of the hollow coil (107); A magnetically conductive washer (108) that contacts the second permanent magnet (109-1); A magnetic conductive plate (113) in contact with the magnetic conductive gasket (108); A wire casing (106) for accommodating the hollow coil (107).

3. A contactor according to claim 2, characterized in that: The contact bridge bracket (119) is used to mount the moving contact plate (116-2) via a contact spring (124).

4. A contactor according to claim 2, characterized in that: The magnetic holding contactor further comprises: an energy-saving plate (102) connected to the hollow coil (107).

5. A contactor according to claim 1, characterized in that: The contactor body (201) is an electric holding contactor, and the electric holding contactor comprises: A wire (125) connected to the resistor element (105) A stationary touch plate (116-1) connected to the other end of the wire (125); A movable touch panel (116-2) matched with the stationary touch panel (116-1); A contact bridge bracket (119) for assembling the moving contact plate (116-2); A linkage rod (112) connected to the contact bridge bracket (119); A moving iron core (110) connected to the linkage rod (112); A reaction spring (123) that contacts the moving iron core (110); A static iron core (122) that contacts the reaction spring (123); A hollow coil (107) disposed on the periphery of the static iron core (122) and the movable iron core (110); A wire casing (106) for accommodating the hollow coil (107); The contact bridge bracket (119) is assembled with the moving contact plate (116-2) via a contact spring (124).

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