A contactor

Abstract

The utility model discloses a contactor, belonging to the technical field of contactors, comprising: a buffer resistor component; and a contactor body connected to the buffer resistor component; wherein the buffer resistor component comprises: a shell connected to the contactor body; a resistor element wound around the shell; and an insulating shell wrapping the resistor element; wherein the resistor element is connected to the contactor body; the contactor can be used for direct current switching, and when charging a large capacitor in frequency conversion, the frequency converter factory does not need to install a charging resistor, can suppress charging current, protect a power supply and a rectifying 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 not restricted, 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 a 380V inverter), so the bus current must be less than the input rated current of the inverter. As the capacitor voltage 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 a time will cause the charging current to drop slowly, resulting in a large average power of the resistor, unnecessary losses and excessive 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, but the charging resistor and the static contact plates are not easy to connect, 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 problems. Summary of the invention

[0004] The utility model aims to provide a contactor to solve the problem of excessive charging current of a capacitor.

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

[0006] Snubber resistor components;

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

[0008] Wherein, the buffer resistor component comprises:

[0009] A housing connected to the contactor body;

[0010] a resistive element wound around the housing;

[0011] an insulating shell enclosing the resistance element;

[0012] Wherein, the resistance element is connected to the contactor body.

[0013] Preferably, the resistance element is a resistance wire or an enameled wire.

[0014] Preferably, the contactor body is of a magnetic holding contactor or an electric holding contactor.

[0015] Preferably, the magnetic latching contactor comprises:

[0016] a stationary touch plate connected to the resistor element;

[0017] a moving touch panel matching the stationary touch panel;

[0018] A contact bridge bracket for mounting the moving contact plate;

[0019] A linkage rod connected to the contact bridge bracket;

[0020] A moving iron core connected to the linkage rod;

[0021] A coil disposed on the periphery of the moving iron core;

[0022] A first permanent magnet and a second permanent magnet mounted at two ends of the coil;

[0023] a circuit board connected to the coil;

[0024] A magnetically conductive washer in conflict with the second permanent magnet;

[0025] A magnetic conductive plate in contact with the magnetic conductive gasket;

[0026] A wire casing for accommodating the coil;

[0027] Wherein, the contact bridge bracket is used to mount the moving contact plate via a contact spring.

[0028] Preferably, the electrical holding contactor comprises:

[0029] a stationary touch plate connected to the resistor element;

[0030] a moving touch panel matching the stationary touch panel;

[0031] A contact bridge bracket for mounting the moving contact plate;

[0032] A linkage rod connected to the contact bridge bracket;

[0033] A moving iron core connected to the linkage rod;

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

[0035] A static iron core that contacts the reaction spring;

[0036] A coil disposed on the periphery of the static iron core and the moving iron core;

[0037] A wire casing for accommodating the coil;

[0038] Wherein, the contact bridge bracket is used to mount the moving contact plate via a contact spring.

[0039] The technical effects and advantages of the utility model are as follows: the contactor can be used for direct current switching. When charging a large capacitor in frequency conversion, the frequency converter factory does not need to install a charging resistor. It 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

[0040] Figure 1 It is a front view of the contactor of the utility model;

[0041] Figure 2 It is a right side view of the contactor of the utility model;

[0042] Figure 3 For this utility model Figure 2 Sectional view of the middle BB plane;

[0043] Figure 4 It is a cross-sectional view of the magnetic latching contactor in Embodiment 1 of the present utility model;

[0044] Figure 5 It is a cross-sectional view of the electric holding contactor in Embodiment 2 of the present utility model;

[0045] Figure 6 This is a schematic diagram of the structure of the resistance component of the contactor of the utility model;

[0046] Figure 7 This is a structural diagram of the resistance component of the contactor of the utility model without the insulating shell installed;

[0047] Figure 8 It is a three-dimensional diagram of the contactor of the utility model;

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

[0049] In the figure: 101, shell; 102, insulating shell; 103, resistor element; 104, circuit board; 105, wire shell; 106, coil; 107, first permanent magnet; 107-1, second permanent magnet; 108, magnetic gasket; 109, moving iron core; 110, first screw; 111, magnetic plate; 112, connecting rod; 113, upper plate; 114-1, static touch plate; 114-2, moving touch plate; 115, M8 nut assembly; 116, dustproof part; 117, dustproof cover; 118, contact bridge bracket; 119, second screw; 120, third screw; 121, wire; 122, static iron core; 123, reaction spring; 124, contact spring; 201, contactor body; 202, buffer resistor assembly. 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] Embodiment 1:

[0052] The utility model provides Figure 1 , Figure 2 , Figure 3 , Figure 8 A contactor as shown in , comprising:

[0053] Buffer resistor component 202;

[0054] and a contactor body 201 connected to the buffer resistor assembly 202;

[0055] Among them, Figure 6 , Figure 7 The buffer resistor component 202 includes:

[0056] A housing 101 connected to the contactor body 201;

[0057] A resistor element 103 wound around the housing 101;

[0058] An insulating shell 102 encapsulating the resistor element 103; the insulating shell 102 is made of insulating material;

[0059] The resistor element 103 is connected to the contactor body 201 .

[0060] The resistance element 103 is a resistance wire or an enameled wire.

[0061] In this embodiment, the buffer resistor assembly 202 is placed at the lower end of the contactor body 201, the resistor element 103 is wound on the housing 101, the housing 101 is connected and fixed to the lower end of the contactor body 201, the insulating housing 102 wraps the resistor element 103, and the resistor element 103 is connected to the two stationary contact plates 114-1 by the wire 121;

[0062] The type of the contactor body 201 is a magnetic holding contactor or an electric holding contactor;

[0063] like Figure 3 , Figure 4 As shown, the magnetic holding contactor comprises:

[0064] A wire 121 connected to the resistor element 103;

[0065] A stationary contact plate 114 - 1 connected to the other end of the wire 121 ;

[0066] A moving touch panel 114 - 2 matched with the stationary touch panel 114 - 1 ; the moving touch panel 114 - 2 is a bridge-shaped touch panel;

[0067] A contact bridge bracket 118 for mounting the movable contact plate 114 - 2 ; the contact bridge bracket 118 is made of aluminum;

[0068] A linkage rod 112 connected to the contact bridge bracket 118;

[0069] A moving iron core 109 connected to the linkage rod 112;

[0070] The coil 106 is arranged on the periphery of the moving iron core 109; the coil 106 is a hollow coil;

[0071] A first permanent magnet 107 and a second permanent magnet 107 - 1 mounted at both ends of the coil 106 ;

[0072] A circuit board 104 connected to the coil 106;

[0073] A magnetically conductive washer 108 that contacts the second permanent magnet 107 - 1 ;

[0074] A magnetic conductive plate 111 in contact with the magnetic conductive gasket 108;

[0075] A wire casing 105 for accommodating the coil 106;

[0076] Wherein, the contact bridge bracket 118 is mounted on the moving contact plate 114 - 2 via the contact spring 124 ;

[0077] In this embodiment, the contactor body 201 includes a wire casing 105, a first permanent magnet 107, a coil 106, a moving iron core 109, a connecting rod 112, a magnetic conductive plate 111, an upper plate 113, a static contact plate 114-1, a moving contact plate 114-2, a contact bridge bracket 118, a contact spring 124 and a dust cover 117, wherein the upper end of the wire casing 105 is connected to the lower end of the upper plate 113, the upper end of the upper plate 113 is connected to the dust cover 117, and a dustproof member 116 is provided between the upper plate 113 and the dust cover 117; the coil 106 is placed in the wire casing 105, and the first permanent magnet 107 and the second permanent magnet 107-1 are placed at the upper and lower ends of the coil 106 The moving iron core 109 is placed in the coil 106, the moving iron core 109 is connected to the lower end of the linkage rod 112, the moving touch plate 114-2 is placed inside the contact bridge bracket 118, and the contact bridge bracket 118 is connected to the upper end of the linkage rod 112; the circuit board 104 is placed below the wire housing 105; the wire housing 105 and the upper plate 113 are fixed by a third screw 120; the linkage rod 112 and the moving iron core 109 are fixed by a first screw 110; two stationary touch plates 114-1 are respectively provided with M8 nut assemblies 115; the linkage rod 112 and the contact bridge bracket 118 are fixed by a second screw 119; the upper plate 113 is integrated with a mounting bent plate;

[0078] Working principle:

[0079] In this embodiment, when the coil 106 is not energized, the moving iron core 109 is affected by the magnetic field of the second permanent magnet 107 - 1 and is adsorbed on the magnetic conductive plate 111 ;

[0080] When the coil 106 is energized, the coil 106 generates the same magnetic field as the first permanent magnet 107 and together with the first permanent magnet 107 attracts the moving iron core 109 from the top to the bottom, and drives the moving contact plate 114-2 to move: the normally open contact is closed;

[0081] When the coil 106 is powered off, the moving touch plate 114-2 will not be disconnected due to the magnetic field of the first permanent magnet 107; when the coil 106 is powered on in the reverse direction, the same magnetic field as the second permanent magnet 107-1 is generated, and the moving iron core 109 is attracted to the magnetic conductive plate 111 together with the second permanent magnet 107-1, and the moving touch plate 114-2 is driven to move: the normally open contact is disconnected;

[0082] When the frequency converter is in use, the main circuit is closed, the moving contact plate 114 - 2 is disconnected, and the current charges the capacitor through the buffer resistor component 202 . After charging is completed, the main contact of the contactor is closed, the circuit where the buffer resistor is located is short-circuited, and the main circuit operates normally.

[0083] Embodiment 2:

[0084] The contactor body 201 in the embodiment 1 is replaced by an electric holding contactor, such as Figure 5 As shown, including:

[0085] A wire 121 connected to the resistor element 103;

[0086] A stationary contact plate 114 - 1 connected to the other end of the wire 121 ;

[0087] A moving touch panel 114 - 2 matched with the stationary touch panel 114 - 1;

[0088] A contact bridge bracket 118 for mounting the moving contact plate 114 - 2 ;

[0089] A linkage rod 112 connected to the contact bridge bracket 118;

[0090] A moving iron core 109 connected to the linkage rod 112;

[0091] A reaction spring 123 that contacts the moving iron core 109;

[0092] A static iron core 122 that conflicts with the reaction spring 123;

[0093] The coil 106 is arranged outside the static iron core 122 and the moving iron core 109;

[0094] A wire casing 105 for accommodating the coil 106;

[0095] The contact bridge support 118 is mounted on the moving contact plate 114 - 2 via a contact spring 124 .

[0096] The electric holding contactor includes a wire shell 105, an upper plate 113, a static iron core 122, a coil 106, a moving iron core 109, a reaction spring 123, a connecting rod 112, a moving touch plate 114-2, a contact spring 124 and a dust cover 117. The static iron core 122 and the moving iron core 109 are both arranged in the coil 106, the reaction spring 123 is arranged between the static iron core 122 and the moving iron core 109, the lower end of the connecting rod 112 is connected to the moving iron core 109, the moving touch plate 114-2 is placed inside the contact bridge bracket 118, and the contact bridge bracket 118 is connected to the upper end of the connecting rod 112.

[0097] When the coil 106 is energized, the static iron core 122 generates electromagnetic attraction, and the moving iron core 109 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 114-2 to move: the normally open contact is closed;

[0098] When the coil 106 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 109 away, while driving the linkage rod 112 to move upward, and the linkage rod 112 drives the moving touch plate 114-2 to move: the normally open contact is disconnected.

[0099] 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 202. 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.

[0100] Working principle:

[0101] When the coil 106 is energized, the static iron core 122 generates electromagnetic attraction, and the moving iron core 109 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 114-2 to move: the normally open contact is closed;

[0102] When the coil 106 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 109 away, and at the same time drives the linkage rod 112 to move upward, and the linkage rod 112 drives the moving touch plate 114-2 to move: the normally open contact is disconnected;

[0103] 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 202. 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.

[0104] 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 103.

[0105] 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 buffer resistor component (202); The buffer resistor component (202) comprises: A housing (101) connected to the contactor body (201); A resistance element (103) is wound around the housing (101).

2. A contactor according to claim 1, characterized in that: The resistance element (103) is wrapped by an insulating shell (102); wherein the resistance element (103) and the contactor body (201) are connected by a wire (121).

3. A contactor according to claim 1 or 2, characterized in that: The resistance element (103) is a resistance wire or an enameled wire.

4. A contactor according to claim 1, characterized in that: The type of the contactor body (201) is a magnetic holding contactor or an electric holding contactor.

5. A contactor according to claim 4, characterized in that: The magnetic latching contactor comprises: A wire (121) connected to the resistor element (103) A stationary touch plate (114-1) connected to the other end of the wire (121); a movable touch panel (114-2) matching the stationary touch panel (114-1); A contact bridge bracket (118) for mounting the moving contact plate (114-2); A linkage rod (112) connected to the contact bridge bracket (118); A moving iron core (109) connected to the linkage rod (112); A coil (106) disposed on the periphery of the moving iron core (109); A first permanent magnet (107) and a second permanent magnet (107-1) mounted at two ends of the coil (106); A circuit board (104) connected to the coil (106); A magnetically conductive washer (108) that contacts the second permanent magnet (107-1); A magnetic conductive plate (111) in contact with the magnetic conductive gasket (108); A wire casing (105) for accommodating the coil (106); The contact bridge bracket (118) is mounted on the moving contact plate (114-2) via a contact spring (124).

6. A contactor according to claim 4, characterized in that: The electric holding contactor comprises: A wire (121) connected to the resistor element (103) A stationary touch plate (114-1) connected to the other end of the wire (121); a movable touch panel (114-2) matching the stationary touch panel (114-1); A contact bridge bracket (118) for mounting the moving contact plate (114-2); A linkage rod (112) connected to the contact bridge bracket (118); A moving iron core (109) connected to the linkage rod (112); A reaction spring (123) that contacts the moving iron core (109); A static iron core (122) that contacts the reaction spring (123); A coil (106) disposed on the periphery of the static iron core (122) and the moving iron core (109); A wire casing (105) for accommodating the coil (106); The contact bridge bracket (118) is mounted on the moving contact plate (114-2) via a contact spring (124).

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