Pre-charging contactor
By using multiple sets of fixed limiting devices in the contactor to position and buffer the line conversion device, the problem of high-speed collision of contacts during the suction and engagement process is solved, which extends the service life and reduces maintenance costs.
Patent Information
- Application Number
- CN202420670637.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-04-02
AI Technical Summary
The dynamic and static contacts of existing contactors are prone to high-speed collisions during the suction and engagement process, resulting in arcing, reducing the service life of the contactor and increasing maintenance costs.
A precharge contactor is designed, and multiple sets of fixed limiting devices are used to position and buffer the line conversion device to avoid high-speed collisions in the contacts during the suction and engagement process.
By avoiding arcing, the service life of the contactor is extended and the cost of equipment maintenance is reduced.
Smart Images
Figure CN222927386U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power equipment, in particular to a pre-charging contactor. Background Art
[0002] At present, a well-known contactor is composed of an electromagnetic coil, a static iron core, a reaction spring, a moving iron core, a bridge-type static contact, a bridge-type moving contact, and an arc extinguishing cover, which are connected in combination according to functions. When the electromagnetic coil of the contactor is energized, the bridge-type moving contact connected to the moving iron core contacts and closes with the bridge-type static contact under the action of electromagnetic force, and the circuit is connected; when the electromagnetic coil of the contactor is de-energized, the moving contact and the static contact are separated, and the circuit is disconnected, thereby realizing the functions of quickly cutting off the AC and DC main circuits and frequently switching and controlling large currents. However, during the closing process of the moving and static contacts of the existing contactor, arcs are likely to be generated due to high-speed collisions. If no intervention is carried out in advance, the moving and static contacts of the contactor will be damaged under the high-temperature burning of the arcs for a long time, reducing the service life of the contactor and increasing the labor and material costs of equipment maintenance. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a pre-charging contactor, which mainly solves the technical problems proposed in the existing technology.
[0004] To achieve the above purpose, the utility model provides the following technical solutions:
[0005] The pre-charging contactor includes a base, the top end of the base is fixedly connected with a housing, the interior of the housing is a hollow structure, and an armature driving device is arranged inside the housing;
[0006] One end of the armature driving device is fixedly provided with an armature restoring device, and the armature restoring device is used to drive the armature driving device to reset after power-off;
[0007] One side of the armature restoring device away from the armature driving device is fixedly connected with a fixing rod, the other end of the fixing rod is fixedly connected with a circuit converting device, and a plurality of groups of fixed limiting devices are arranged between the opposite sides of the circuit converting device and the inner wall of the housing.
[0008] Preferably, the housing includes a first housing, the first housing and the base are integrated, the opening of the first housing is fixedly connected with a second housing through a fastener, the bottom ends of the first housing and the second housing form a rectangular armature driving chamber, and an end cover is arranged at the opening end of the armature driving chamber, and the end cover is fixedly connected with the first housing and the second housing respectively;
[0009] The armature driving device is adapted to the armature driving chamber;
[0010] The inner top ends of the first housing and the second housing are both inclined with multiple groups of strip plates, and the multiple groups of strip plates are arranged and distributed at equal intervals in the horizontal direction.
[0011] Preferably, the armature driving device includes a static iron core, the static iron core is fixedly connected to the end cover, a moving iron core is slidably connected to the inner wall of the armature driving chamber, and the moving iron core is adapted to the static iron core;
[0012] A coil is wound around the static iron core, one end of the coil is connected to a T-pole connection board, the other end of the coil is connected to an L-pole connection board, and the input ends of the T-pole connection board and the L-pole connection board are both located outside the housing.
[0013] Preferably, the armature restoring device includes a fixing plate, one end of the fixing plate is fixedly connected to the side of the moving iron core away from the static iron core, two groups of connecting rods are fixedly connected to the upper and lower sides of the other end of the fixing plate in the horizontal direction, the other ends of the two groups of connecting rods both penetrate through the inner wall of the armature driving chamber and are fixedly connected to a resisting portion, a spring is arranged between the resisting portion and the armature driving chamber, and the spring is sleeved on the outer surface of the connecting rod;
[0014] The fixing plate is fixedly connected to the fixing rod.
[0015] Preferably, the fixing and limiting device includes two groups of U-shaped frames, the two groups of U-shaped frames are respectively fixedly connected to the inner walls of the first housing and the second housing, and the two groups of U-shaped frames are both adapted to the circuit conversion device;
[0016] The number of each group of U-shaped frames is at least two, and the two U-shaped frames are arranged vertically;
[0017] Sliders are slidably connected in the U-shaped frames, the sliders are fixedly connected to the circuit conversion device, buffer gaskets are fixedly connected to the opposite sides of the sliders, and the buffer gaskets are matched with the U-shaped frames.
[0018] Preferably, the circuit conversion device includes a substrate, the bottom of the substrate is fixedly connected to the remaining end of the fixing rod, and the opposite sides of the substrate are respectively fixedly connected to the sliders;
[0019] Two groups of normally open contacts and two groups of normally closed contacts are respectively arranged on the opposite sides of the substrate, and the two groups of normally open contacts are both located on the side close to the armature restoring device, and the two groups of normally closed contacts are both located on the side far from the armature restoring device;
[0020] Each set of the normally open contacts and the normally closed contacts includes a set of moving contacts and a set of static contacts. The four sets of moving contacts are all fixedly connected to the substrate, and the four sets of static contacts are all fixedly connected to the inner wall of the first housing through brackets, and the four sets of static contacts respectively correspond to the four sets of moving contacts one by one;
[0021] On the outer surface of the first housing and on the side far from the end cover, a lining plate is fixedly connected. The four sets of moving contacts and the four sets of static contacts are all connected with pins through leads, and multiple sets of the pins are fixedly installed on the lining plate in pairs.
[0022] Preferably, mounting holes are provided at the top of the base and on both sides of the housing. One of the mounting holes is in the shape of a U-shaped groove, and the remaining one of the mounting holes is in the shape of a round hole.
[0023] Preferably, a grounding bolt hole is provided at the top of the base.
[0024] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0025] In the present utility model, a plurality of fixed limiting devices can play a role in positioning and buffering the line conversion device, avoiding high-speed collisions between the moving and static contacts of the contactor during the closing process, generating electric arcs, and causing damage to the moving and static contacts of the contactor due to long-term exposure to the high temperature of the electric arcs; thereby, the service life of the contactor can be improved, and the labor and material costs for equipment maintenance can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0027] Figure 1 is a perspective view of the pre-charging contactor of the present utility model;
[0028] Figure 2 In the present utility model Figure 1 is a schematic diagram of the reverse structure;
[0029] Figure 3 In the present utility model Figure 1 is a schematic diagram of the internal structure after removing the second housing;
[0030] Figure 4 In the present utility model Figure 3 is a schematic diagram of the cooperation structure between the substrate and the fixed limiting device;
[0031] Figure 5 Schematic diagram of the circuit connection of the pre-charge contactor of the present utility model.
[0032] In the figure: base 1, mounting hole 101, earthing bolt hole 102, housing 2, first housing 21, second housing 22, armature driving chamber 23, end cover 24, strip plate 25, armature driving device 3, coil 31, static iron core 32, moving iron core 33, T-pole connection plate 34, L-pole connection plate 35, armature restoring device 4, fixing plate 41, connecting rod 42, abutting portion 43, spring 44, fixing rod 5, circuit conversion device 6, substrate 61, normally open contact 62, normally closed contact 63, moving contact 64, static contact 65, lining plate 66, pin 67, fixing and limiting device 7, U-shaped frame 71, slider 72, buffer gasket 73. Detailed implementation manners
[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0034] As Figures 1-5 shown, the present utility model provides a pre-charge contactor, which includes a base 1. The top end of the base 1 is fixedly connected with a housing 2. The interior of the housing 2 is provided with a hollow structure, and an armature driving device 3 is arranged inside the housing 2; one end of the armature driving device 3 is fixedly provided with an armature restoring device 4, and the armature restoring device 4 is used to drive the armature driving device 3 to reset after power-off; the side of the armature restoring device 4 away from the armature driving device 3 is fixedly connected with a fixing rod 5, and the other end of the fixing rod 5 is fixedly connected with a circuit conversion device 6. A plurality of fixing and limiting devices 7 are arranged between the opposite sides of the circuit conversion device 6 and the inner wall of the housing 2; when the armature driving device 3 is powered on, it will drive the circuit conversion device 6 to switch to the next working state through the fixing rod 5; at the same time, the circuit conversion device 6 can be positioned and buffered by a plurality of fixing and limiting devices 7, avoiding high-speed collisions between the moving and static contacts of the contactor to generate electric arcs, resulting in damage to the moving and static contacts of the contactor due to long-term exposure to the high temperature of the electric arcs; thus, the service life of the contactor can be improved, and the labor and material costs for equipment maintenance can be reduced.
[0035] Further, the housing 2 includes a first housing 21, the first housing 21 and the base 1 are integrally provided, a second housing 22 is fixedly connected to the opening of the first housing 21 through a fastener, a rectangular armature drive chamber 23 is formed at the bottom ends of the first housing 21 and the second housing 22, an end cover 24 is provided at the open end of the armature drive chamber 23, and the end cover 24 is fixedly connected to the first housing 21 and the second housing 22 respectively; the armature drive device 3 is adapted to the armature drive chamber 23; a plurality of groups of strip plates 25 are inclinedly arranged at the inner top ends of the first housing 21 and the second housing 22, and the plurality of groups of strip plates 25 are arranged at equal intervals in the horizontal direction; by setting the housing as a split structure, it is convenient to assemble the electrical components; at the same time, through the plurality of groups of strip plates 25 provided at the tops of the first housing 21 and the second housing 22, the arc can be guided to blow out longitudinally, preventing phase-to-phase short circuit, and making the arc contact the wall of the strip plate 25, so as to be quickly cooled, increasing the deionization effect, increasing the arc column voltage drop, forcing the arc to extinguish, and playing the role of arc extinguishing.
[0036] Further, the armature drive device 3 includes a static iron core 32, the static iron core 32 is fixedly connected to the end cover 24, a moving iron core 33 is slidably connected to the inner wall of the armature drive chamber 23, and the moving iron core 33 is adapted to the static iron core 32; a coil 31 is wound around the static iron core 32, one end of the coil 31 is connected to a T-pole terminal board 34, the other end of the coil 31 is connected to an L-pole terminal board 35, and the input ends of the T-pole terminal board 34 and the L-pole terminal board 35 are both located outside the housing 2; before using the contactor, first connect the T-pole terminal board 34 and the L-pole terminal board 35 to the main circuit in the circuit respectively to control the power-on and power-off of the coil 31; when the coil 31 is powered on, the current of the coil 31 generates a magnetic field, and the generated magnetic field makes the static iron core 32 generate electromagnetic suction to attract the moving iron core 33 to drive the line conversion device 6 to switch the working state; when the coil 31 is powered off, the electromagnetic suction disappears, and then the line conversion device 6 is reset under the action of the armature restoring device 4.
[0037] Furthermore, the armature restoration device 4 includes a fixed plate 41. One end of the fixed plate 41 is fixedly connected to the side of the moving iron core 33 away from the static iron core 32. On the upper and lower sides of the other end of the fixed plate 41, two groups of connecting rods 42 are fixedly connected in the horizontal direction. The other ends of the two groups of connecting rods 42 both penetrate through the inner wall of the armature driving chamber 23 and are fixedly connected with a holding portion 43. A spring 44 is arranged between the holding portion 43 and the armature driving chamber 23, and the spring 44 is sleeved on the outer surface of the connecting rod 42. The fixed plate 41 is fixedly connected to one end of the fixed rod 5. When the coil 31 is energized, the static iron core 32 will attract the moving iron core 33, and then the moving iron core 33 will drive the fixed plate 41 to move towards the side close to the static iron core 32, so that the fixed plate 41 drives the holding portion 43 to compress the spring 44 through the connecting rod 42, and then the spring 44 stores energy. When the coil 31 is de-energized, the electromagnetic attraction disappears. Under the action of the elastic restoring force of the spring 44, the holding portion 43 will be extruded towards the side away from the static iron core 32, so that the holding portion 43 drives the fixed plate 41 to move synchronously through the connecting rod 42, and thus the static iron core 32 can be driven by the fixed plate 41 to reset.
[0038] Furthermore, the fixed limit device 7 includes two groups of loop frames 71. The two groups of loop frames 71 are respectively fixedly connected to the inner walls of the first housing 21 and the second housing 22, and both groups of loop frames 71 are adapted to the line conversion device 6. The number of each group of loop frames 71 is at least two, and the two loop frames 71 are arranged vertically. A slider 72 is slidably connected in each loop frame 71. The slider 72 is fixedly connected to the line conversion device 6. Buffer gaskets 73 are fixedly connected to the opposite sides of the slider 72, and the buffer gaskets 73 match the loop frames 71. When the coil 31 is switched between energization and de-energization, the line conversion device 6 will move synchronously in the horizontal direction, so that the line conversion device 6 drives the slider 72 to slide along the inner wall of the loop frame 71. At the same time, the slider 72 drives the buffer gaskets 73 on both sides to move in the same direction, which can play a certain buffering role for the line conversion device 6.
[0039] Furthermore, the line conversion device 6 includes a substrate 61. The bottom of the substrate 61 is fixedly connected to the remaining end of the fixed rod 5. The opposite sides of the substrate 61 are respectively fixedly connected to the sliders 72.
[0040] Two groups of normally open contacts 62 and two groups of normally closed contacts 63 are respectively arranged on the opposite sides of the substrate 61, and both groups of normally open contacts 62 are located on the side close to the armature restoration device 4, and both groups of normally closed contacts 63 are located on the side away from the armature restoration device 4.
[0041] Each set of normally open contacts 62 and normally closed contacts 63 includes a set of moving contacts 64 and a set of static contacts 65. The four sets of moving contacts 64 are fixedly connected to the substrate 61. The four sets of static contacts 65 are fixedly connected to the inner wall of the first housing 21 through brackets, and the four sets of static contacts 65 correspond to the four sets of moving contacts 64 one by one. On the outer surface of the first housing 21 and on the side far from the end cover 24, a lining plate 66 is fixedly connected. The four sets of moving contacts 64 and the four sets of static contacts 65 are each connected with a lead to a pin 67, and multiple groups of pins 67 are fixedly installed on the lining plate 66 in pairs. When using this contactor, first, the external protection circuit is fixedly connected to the pin 67 by means of screw M3 pressing or plug-in. When the coil 31 is energized, the fixing rod 5 will drive the substrate 61 to move towards the side close to the normally open contacts 62, so that the normally closed contacts 63 are disconnected and the normally open contacts 62 are closed, and the circuit is connected. When the coil 31 is de-energized, the fixing rod 5 will drive the substrate 61 to move towards the side close to the normally closed contacts 63, so that the contacts are reset, the normally open contacts 62 are disconnected, and the normally closed contacts 63 are closed, and the circuit is disconnected. Thus, the functions of quickly cutting off the AC and DC main circuits and frequently switching on and off and controlling large currents are realized.
[0042] Further, mounting holes 101 are provided at the top of the base 1 and on both sides of the housing 2. One of the mounting holes 101 is arranged in a U-shaped groove, and the remaining mounting hole 101 is arranged in a circular hole shape; it is convenient to adjust the mounting distance.
[0043] Further, a grounding bolt hole 102 is provided at the top of the base 1; the contactor can be grounded by using a grounding stud in combination with a bolt, so that the surface of the grounding stud has good electrical conductivity.
[0044] Working principle: After the coil 31 of the contactor is energized, the static iron core 32 will attract the moving iron core 33. Then, the moving iron core 33 will drive the fixing plate 41 to move towards the side close to the static iron core 32. Next, the fixing plate 41 drives the substrate 61 to move towards the side close to the normally open contact 62 through the fixing rod 5, causing the normally open contact 62 to close and the normally closed contact 63 to open, and the circuit is connected. Similarly, when the coil 31 is de-energized, the electromagnetic attraction disappears. Under the action of the elastic restoring force of the spring 44, the contacts will be reset, the normally open contact 62 will open, and the normally closed contact 63 will close, and the circuit is disconnected. At the same time, during the closing process of the contacts, the substrate 61 will drive the sliders 72 on both sides to slide along the inner wall of the loop-shaped frame 71, and can buffer the substrate 61 at the moment when the contacts close through the buffer gasket 73, avoiding the rapid collision between the moving contact 64 and the static contact 65 during the rapid attraction of the contacts. And because electrons escape from the surface of the contact metal due to primary electron emission (thermionic emission, field emission or photoemission), gas atoms or molecules in the gap will generate electrons and ions due to ionization (impact ionization, photoionization and thermal ionization). In addition, the bombardment of the emission surface by electrons or ions will cause secondary electron emission. When the ion concentration in the gap is large enough, the gap is electrically broken down and an arc occurs. It is easy to cause the moving and static contacts of the contactor to be damaged under the high-temperature burning of the arc for a long time. Thus, the service life of the contactor can be increased, and the labor and material costs of equipment maintenance can be reduced.
[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. Pre-charging contactor, characterized in that: It comprises a base (1), the top end of the base (1) is fixedly connected to a shell (2), the interior of the shell (2) is arranged as a hollow structure, and an armature drive device (3) is arranged inside the shell (2); An armature restoration device (4) is fixedly provided at one end of the armature driving device (3), and the armature restoration device (4) is used to drive the armature driving device (3) to reset after power is cut off; A fixing rod (5) is fixedly connected to one side of the armature reduction device (4) away from the armature driving device (3), and a line conversion device (6) is fixedly connected to the other end of the fixing rod (5). A plurality of sets of fixed limit devices (7) are arranged between opposite sides of the line conversion device (6) and the inner wall of the housing (2).
2. The pre-charging contactor according to claim 1, characterized in that: The housing (2) comprises a first shell (21), the first shell (21) and the base (1) are integrally formed, the opening of the first shell (21) is fixedly connected to the second shell (22) via a fastener, the bottom ends of the first shell (21) and the second shell (22) form a rectangular armature drive chamber (23), the open end of the armature drive chamber (23) is provided with an end cover (24), and the end cover (24) is fixedly connected to the first shell (21) and the second shell (22) respectively; The armature drive device (3) is adapted to the armature drive chamber (23); A plurality of groups of strip plates (25) are obliquely arranged at the inner top ends of the first shell (21) and the second shell (22), and the plurality of groups of strip plates (25) are arranged at equal intervals in the horizontal direction.
3. The pre-charging contactor according to claim 2, characterized in that: The armature drive device (3) comprises a static iron core (32), the static iron core (32) is fixedly connected to the end cover (24), the inner wall of the armature drive chamber (23) is slidably connected to a moving iron core (33), and the moving iron core (33) is adapted to the static iron core (32); A coil (31) is wound around the static iron core (32), one end of the coil (31) is connected to a T-pole wiring board (34), and the other end of the coil (31) is connected to an L-pole wiring board (35), and input ends of the T-pole wiring board (34) and the L-pole wiring board (35) are both located outside the housing (2).
4. The pre-charging contactor according to claim 3, characterized in that: The armature reduction device (4) comprises a fixing plate (41), one end of the fixing plate (41) is fixedly connected to a side of the moving iron core (33) away from the static iron core (32), the other end of the fixing plate (41) is fixedly connected to two groups of connecting rods (42) at the upper and lower sides along the horizontal direction, the other ends of the two groups of connecting rods (42) are both passed through the inner wall of the armature drive chamber (23) and are fixedly connected to a supporting portion (43), a spring (44) is arranged between the supporting portion (43) and the armature drive chamber (23), and the spring (44) is sleeved on the outer surface of the connecting rod (42); The fixing plate (41) is fixedly connected to one end of the fixing rod (5).
5. The pre-charging contactor according to claim 2, characterized in that: The fixed limiting device (7) comprises two sets of return frames (71), the two sets of return frames (71) are respectively fixedly connected to the inner walls of the first shell (21) and the second shell (22), and the two sets of return frames (71) are both compatible with the line conversion device (6); Each group of return-shaped frames (71) is provided with at least two return-shaped frames (71), and the two return-shaped frames (71) are arranged in a vertical direction; A slider (72) is slidably connected inside the return frame (71), the slider (72) is fixedly connected to the line conversion device (6), and buffer pads (73) are fixedly connected to opposite sides of the slider (72), and the buffer pads (73) match the return frame (71).
6. The pre-charging contactor according to claim 5, characterized in that: The line conversion device (6) comprises a base plate (61), the bottom of the base plate (61) is fixedly connected to the remaining end of the fixing rod (5), and the opposite two sides of the base plate (61) are respectively fixedly connected to the slider (72); Two groups of normally open contacts (62) and two groups of normally closed contacts (63) are respectively arranged on opposite sides of the substrate (61), and the two groups of normally open contacts (62) are both located on a side close to the armature reduction device (4), and the two groups of normally closed contacts (63) are both located on a side away from the armature reduction device (4); Each group of the normally open contacts (62) and the normally closed contacts (63) comprises a group of moving contacts (64) and a group of stationary contacts (65); the four groups of moving contacts (64) are fixedly connected to the substrate (61); the four groups of stationary contacts (65) are fixedly connected to the inner wall of the first housing (21) via a bracket; and the four groups of stationary contacts (65) correspond one to one to the four groups of moving contacts (64); A lining plate (66) is fixedly connected to the outer surface of the first shell (21) and on a side away from the end cover (24); the four groups of moving contacts (64) and the four groups of stationary contacts (65) are all connected to pins (67) via leads; and the multiple groups of pins (67) are fixedly mounted on the lining plate (66) in pairs.
7. The pre-charging contactor according to claim 1, characterized in that: Mounting holes (101) are provided at the top of the base (1) and on both sides of the housing (2), wherein one group of the mounting holes (101) is arranged in a U-shaped groove shape, and the remaining group of the mounting holes (101) is arranged in a circular hole shape.
8. The pre-charging contactor according to claim 7, characterized in that: A grounding bolt hole (102) is provided at the top of the base (1).