Device for detecting capacitive electrical life of direct current contactor

Abstract

The utility model discloses a device for detecting the capacitive electrical life of a direct current contactor, which comprises a cabinet body frame and a mechanical supporting part arranged in the cabinet body frame, and the mechanical supporting part is used for installing and constructing components of a test circuit for detecting the capacitive electrical life of the direct current contactor. The cabinet body frame is respectively provided with mounting holes arranged according to a preset size rule, and the mechanical supporting parts are assembled on the cabinet body frame through the mounting holes and divide the cabinet body frame into a plurality of test circuit component mounting and placing intervals which are a first mounting interval, a second mounting interval, a third mounting interval and a fourth mounting interval from bottom to top in sequence. The cabinet body frame is also provided with a test object test chamber facing the front side, and the test object test chamber is used for connecting a test object to a test circuit for life detection. The equipment has the advantages of good installation flexibility, high universality, stable installation and reliable structure.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current contactor detection, in particular to a device for detecting the capacitive electrical life of a direct current contactor. Background Art

[0002] In recent years, new energy vehicles have developed rapidly in China. Due to its high efficiency, energy saving, low noise, and pollution-free characteristics, it has become a new trend in the development of the domestic and foreign automobile industries. Although the power supply, drive, and control system used in new energy vehicles are not much different from those used in industry in theory, due to the extremely high requirements of safety, stability, and reliability in different working conditions, electric vehicles need to make more comprehensive and serious considerations in circuit design and component selection. Among them, on-board DC contactors (also known as DC relays) and DC contactors are increasingly used as the main internal components of charging piles.

[0003] For example, in a charging pile or charger, the on-board DC contactor is used on the DC output side of the charging pile or on the output side of the on-board charger. When the DC contactor is closed, the charging pile or charger is connected to the external vehicle; when the contactor is disconnected, the connection between the charging pile or charger and the external vehicle is isolated, thereby playing a safety protection role. In new energy vehicles, the on-board DC contactor plays an isolation role after the system stops running, and plays a connection role when the system is running. When the vehicle is turned off or a fault occurs, it can safely separate the energy storage system from the vehicle's electrical system, play the role of breaking the circuit, and is used as a power control device in other auxiliary circuits. Therefore, it is very important to detect the capacitive electrical life of the DC contactor.

[0004] The working principle of the DC contactor is that when the DC contactor coil is energized, the coil current will generate a magnetic field. Under the action of the magnetic field, the iron core in the electromagnetic system generates an electromagnetic suction force to attract the armature to move, and drive the contact to move, the normally closed contact is disconnected, and the normally open contact is closed. When the coil is powered off, the electromagnetic suction force disappears, and the armature is released under the action of the reaction spring, so that the contacts are restored to the normally open contact and the normally closed contact is closed. In actual use, the most common reason affecting the life of the DC contactor is the adhesion failure of the contacts. Therefore, the capacitive electrical life of the DC contactor is often detected by detecting the connection and disconnection of the contacts. In the prior art, the detection equipment for the capacitive electrical life of the DC contactor often adds a transformer because it needs to provide a larger voltage, which makes the detection equipment larger in size, and the overall detection equipment has defects such as low assembly flexibility and low safety. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a device for detecting the capacitive life of a DC contactor which is easy to disassemble and assemble and has higher safety performance.

[0006] In order to solve the above technical problems, the technical solutions provided by the utility model are as follows:

[0007] A device for detecting the capacitive life of a DC contactor comprises a cabinet frame and a mechanical support part arranged in the cabinet frame, the cabinet frame is respectively provided with mounting holes arranged according to a preset size rule, the mechanical support part is assembled on the cabinet frame through the mounting holes and divides the cabinet frame into a plurality of test circuit component installation and placement intervals, which are a first installation interval, a second installation interval, a third installation interval and a fourth installation interval from bottom to top, a plurality of capacitors are arranged in the first installation interval, an industrial computer and a DC power supply are arranged in the second installation interval, a keyboard and mouse chassis and a cooling fan are arranged in the third installation interval, and a plurality of resistors are arranged in the fourth installation interval; a test sample test chamber is also arranged on the front panel of the cabinet frame, which is used to connect the test sample to the test circuit for life detection.

[0008] Furthermore, the bottom of the cabinet frame is hollowed out and a dense steel mesh is fixedly installed, and movable casters are fixedly installed at the four corners; the top of the cabinet frame is detachably provided with a top cover with a mesh structure, and hanging rings are provided at the four corners; the rear side of the cabinet frame is symmetrically provided with a rear door of a double-door structure; and the left and right sides of the cabinet frame are provided with sealing plates.

[0009] Furthermore, a control panel and an operation panel are provided on the front panel, wherein the control panel includes an operable part of a display, an industrial computer and / or a keyboard and mouse chassis, which is used to set parameters and perform disconnection control on the test circuit; the operation panel includes a rotary switch and a sample test chamber, and the rotary switch is used to adjust the impedance gear.

[0010] Furthermore, the mechanical support part includes a plurality of side beams arranged on the upper side of the cabinet frame, and a plurality of supporting beams penetrating the interior of the cabinet frame and horizontally arranged between two side beams.

[0011] Furthermore, the side crossbeam is a C-shaped structure, and the three sides of the C-shaped structure are respectively provided with mounting holes arranged according to the module E=20mm. The supporting crossbeam is a C-shaped structure, and the top surface is provided with mounting holes arranged according to E=45mm. The side crossbeam is installed on the cabinet frame through the mounting holes, and the two ends of the supporting crossbeam are installed on the side crossbeam through the mounting holes.

[0012] Furthermore, an explosion-proof isolation plate is provided between the first installation interval and the second installation interval.

[0013] Furthermore, a fan fixing plate is horizontally arranged in the third installation area, and the heat dissipation fan is arranged on the fan fixing plate.

[0014] Furthermore, the sample test chamber is provided with a plurality of sample access positions for connecting the sample to the test circuit for life detection.

[0015] Furthermore, the sample testing room is hingedly provided with a side-opening experimental door, and the experimental door is provided with explosion-proof glass.

[0016] Furthermore, an epoxy board is arranged at the rear of the sample testing room opposite to the experimental door, and the sample access position is arranged on the epoxy board.

[0017] Compared with the prior art, the device for detecting the capacitive life of a DC contactor provided by the utility model has the following beneficial effects:

[0018] (1) The entire cabinet frame has mounting holes arranged according to the module. Therefore, bolt connection can be used for the installation connection of the overall frame and the installation connection of the side beams and support beams. No welding is required, and the installation flexibility is high. It is also highly versatile. When some components are eliminated, the GGD cabinet has good installation flexibility and will not cause installation problems due to the modification or update of components.

[0019] (2) The capacitor is placed at the bottom of the entire device, and an explosion-proof isolation plate is placed directly above the capacitor to isolate the capacitor and prevent the capacitor from burning other equipment after charging and exploding, thus playing an isolation and explosion-proof role.

[0020] (3) The impedance is placed at the top of the entire device, and a cooling fan is provided below the impedance. During the test, the impedance is placed at the top of the cabinet, and a mesh structure plate is used on the top with a cooling fan. During the test, when the temperature inside the equipment rises to the set value, the cooling fan starts to work and exhausts air vertically upward toward the impedance. The heat is quickly discharged from the mesh structure plate on the top, accelerating the cooling of the cabinet.

[0021] (4) For equipment that needs to be operated, such as keyboard and mouse chassis, industrial computers, DC power supplies, and rotary switches, panel installation is adopted, that is, only the side that needs to be operated is exposed to the outside, and the other parts of the equipment are hidden inside the equipment. This not only increases the operability, but also increases the beauty of the appearance, making it simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The overall structural diagram of the device for detecting the capacitive life of a DC contactor provided by the embodiment of the utility model;

[0023] Figure 2 A schematic diagram of the internal structure of the general assembly of a device for detecting the capacitive life of a DC contactor provided in an embodiment of the utility model;

[0024] Figure 3 A schematic diagram of the structure of the general assembly of a device for detecting the capacitive life of a DC contactor provided by an embodiment of the utility model from another angle;

[0025] Figure 4 A schematic diagram of the internal structure from another angle of a device for detecting the capacitive life of a DC contactor provided in an embodiment of the utility model;

[0026] Figure 5 A schematic diagram of a cabinet frame structure provided by an embodiment of the utility model;

[0027] Figure 6 for Figure 5 The enlarged structural diagram at A in the middle;

[0028] Figure 7 for Figure 5 Enlarged structural diagram at B in the middle.

[0029] Description of main reference numerals:

[0030] 1-cabinet frame; 101-top long beam; 102-top short beam; 103-column; 104-bottom long beam; 105-bottom short beam; 106-covering plate; 107-rear door; 108-reinforcement rib; 109-moving casters; 110-top cover; 111-front panel, 112-sample test room; 1121-epoxy board; 1122-experimental door; 2-mechanical support; 201-side beam; 202-support beam; 3-assembly components; 301-component control box; 302-explosion-proof isolation board; 303-display; 304-rotary switch; 305-keyboard and mouse chassis; 306-industrial computer; 307-DC power supply; 308-impedance device; 309-cooling fan; 310-capacitor; DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be the internal connection of two components; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] See also Figure 1-Figure 7 The embodiment of the utility model provides a device for detecting the capacitive life of a DC contactor, comprising a cabinet frame 1 and a mechanical support part 2 arranged in the cabinet frame 1, the mechanical support part 2 being used to fix, support and install components for detecting the capacitive life of a DC contactor, i.e., an assembly component 3. The cabinet frame 1 is provided with mounting holes arranged according to a module, i.e., mounting holes arranged according to a predetermined size rule, and the mechanical support part 2 is assembled on the cabinet frame 1 through the mounting holes.

[0035] The structure of the cabinet frame 1 includes a group of top long beams 101, top short beams 102, columns 103, bottom long beams 104, and bottom short beams 105, and a plurality of reinforcing ribs 108 arranged parallel to the top short beams 102 and the bottom short beams 105, between two top long beams 101, two bottom long beams 104, or between two adjacent columns 103 on the left and right sides of the cabinet frame 1, and the reinforcing ribs 108 are arranged by welding. Among them, the top long beams 101, the top short beams 102, the columns 103, the bottom long beams 103, and the bottom short beams 105 are respectively provided with mounting holes arranged according to the module, so as to improve the versatility of product assembly, so the connection between the top long beams 101, the top short beams 102, the bottom long beams 104, and the bottom short beams 105 and the columns 103 can be bolted, without welding, and the installation is stable, the structure is reliable, and the maintenance is convenient.

[0036] The bottom of the cabinet frame 1 is hollowed out and fixedly installed with a dense steel wire mesh, which is convenient for powering the system and preventing foreign objects such as mice and insects from entering the equipment and causing malfunctions, and mobile casters 109 are fixedly installed at the four corners; the top of the cabinet frame 1 is detachably provided with a mesh structure top cover 110, and four corners are provided with lifting rings for easy lifting and transportation; the rear side of the cabinet frame 1 is symmetrically provided with a double-door structure rear door 107, and the upper part of the rear door 107 is provided with a heat-dissipating and waterproof shutter, and the rear door is connected to the cabinet frame 1 with a galvanized pivot hinge, which is convenient for installation and disassembly; the left and right sides of the cabinet frame 1 are sealing plates 106, and the entire cabinet frame panel adopts a spray-coated process, with strong adhesion and good texture. The whole cabinet is matte in color, which avoids the dazzling effect and creates a more comfortable visual environment for the staff.

[0037] The front of the cabinet frame 1 is a front panel 111. The front panel 11 is a box-shaped structure as a whole, and is made of cold-rolled plate and bent in one piece. It is suspended and installed on the front side of the cabinet frame 1, and is used as a panel, and has auxiliary functions such as partitions and installation of operation buttons. Specifically, the front panel 111 includes a control panel and an operation panel. The control panel includes an operable part such as a display 303, an industrial computer 306, and a keyboard and mouse chassis 305, which are used to set parameters and disconnect the control circuit. Among them, the display 303 facilitates the operation and recording of the test process, and can conveniently configure the test parameters, observe the state of the entire test process, and can simultaneously record the waveform of each charge and discharge test on the working display interface, and record and analyze the waveform. The operation panel includes a rotary switch 304, a sample test chamber 112, etc. The rotary switch 304 is used to adjust the impedance gear, and the sample test chamber 112 is used to connect the sample to the test circuit for testing.

[0038] The mechanical support part 2 includes a side beam 201 disposed between two upright posts 103 on the upper side of the cabinet frame 1 , and a supporting beam 202 penetrating through the interior of the cabinet frame 1 and transversely disposed between the two side beams 201 . Specifically, the side beam 201 is a C-shaped structure, and the three sides of the C-shaped structure are provided with mounting holes arranged according to the module E=20mm, which are used to install the supporting beam 202 and strengthen the strength of the cabinet frame 1; the supporting beam 202 is a C-shaped structure, and the top surface thereof is provided with mounting holes arranged according to the module E=45mm. The side beam 201 is installed between two adjacent columns 103 on the side through the mounting holes, and the two ends of the supporting beam 202 are installed on the side beam 201 through the mounting holes, which are used to install heavier embedded assembly components, such as a DC power supply 307, an industrial computer 306, a keyboard and mouse chassis 305, etc.; the mechanical support part 2 also includes a plurality of side vertical beams vertically arranged on the side beam 201, and the side vertical beam is a C-shaped structure, and the three sides of the C-shaped structure are provided with mounting holes arranged according to the module E=20mm, which are used to realize the installation of the components to be installed in the vertical direction.

[0039] In this embodiment, three groups of supporting beams 202 are arranged in the cabinet frame 1 from bottom to top, dividing the cabinet frame 1 into four installation and placement intervals, which are recorded as the first installation interval, the second installation interval, the third installation interval and the fourth installation interval from bottom to top.

[0040] A number of capacitors 310 are arranged in the first installation interval; and since the capacitors 310 will be subjected to multiple charge and discharge tests during the test, in order to prevent the capacitors 310 from exploding when overcharged and burning other equipment inside, the capacitors 310 are placed at the bottom of the equipment, and an explosion-proof isolation plate 302 formed by bending a cold-rolled plate in one piece is arranged directly above, isolating the capacitors 310 from the second installation interval, preventing the capacitors 310 from burning other equipment after charging and exploding, and playing the role of isolation and explosion prevention. In this embodiment, the isolation plate 302 is installed inside the universal cabinet through the side beams 202, and is located below the first group of support beams 202.

[0041] An industrial computer 306 and a DC power supply 307 are arranged in the second installation area. The industrial computer 306 is used to select a test gear, set test parameters, etc. to perform disconnection control on the control circuit, and the DC power supply 307 is used to provide power input for testing.

[0042] The third installation area is provided with a keyboard and mouse chassis 305 and a cooling fan 309, and the cooling fan 309 is provided on a fan fixing plate, and the fan fixing plate is parallel to the supporting crossbeam 202 and is arranged across the interior of the cabinet frame 1. In this embodiment, three cooling fans 309 are provided on the fan fixing plate to accelerate the vertical upward circulation of air inside the cabinet, thereby accelerating the cooling of the cabinet.

[0043] The fourth installation interval is located at the top of the cabinet frame 1, and is provided with a number of resistors 308 and a component control box 301; the component control box 301 is a box-shaped structure as a whole, formed by bending a cold-rolled plate in one piece, and is provided on one side of the fourth installation interval for installing various secondary wiring components; the resistor 308 is installed on the other side of the fourth installation interval. During the test, the resistor 308 will emit a large amount of heat, causing the temperature inside the cabinet to rise rapidly, and excessive temperature will burn other electrical components (especially the display) inside the cabinet. Therefore, in order to accelerate the heat dissipation effect of the cabinet, the resistor 308 is set at the top of the cabinet, and a mesh structure plate is used on the top. Below the resistor 308 is a cooling fan 309 provided in the third installation interval; during the test, when the temperature inside the cabinet rises to the set value, the cooling fan 309 starts to work, exhausting air vertically upward toward the resistor 308, and the heat is quickly discharged from the mesh structure plate at the top.

[0044] The cabinet frame 1 is also provided with a sample test chamber 112 facing the front, and a number of sample access positions are provided in the sample test chamber 112 for connecting the sample to the test circuit for life detection. In this embodiment, three sample access positions are provided, and the three samples are tested in sequence during the test. The sample test chamber is hingedly provided with a side-opening experimental door 1122 to separate the operating area, and the experimental door 1122 is provided with explosion-proof glass to observe the test status of the sample during the test. An epoxy board 1121 is also provided at the rear of the sample test chamber 112 opposite to the experimental door 1122, and the sample access position is provided on the epoxy board 1121, and the epoxy board 1121 is made of excellent insulating materials with high dielectric properties, surface leakage resistance, and arc resistance, which is used to prevent leakage of the terminal when the sample is connected to avoid danger.

[0045] The cabinet provided by the embodiment of the utility model has good installation flexibility in mechanical structure and high versatility. The fixed installation of electrical components such as resistors, relays, contactors, and circuit breakers can be connected to the cabinet frame or mechanical support part by bolts. In the subsequent use process, even if some products are eliminated, since the GGD (fixed wiring low-voltage distribution cabinet, G--low-voltage distribution cabinet; G--fixed installation, fixed wiring; D--electricity cabinet) type cabinet has good installation flexibility, it will not cause installation troubles due to the modification or update of components, and its use safety is greatly improved. And for equipment that needs to be operated, such as keyboard and mouse chassis, industrial computers, DC power supplies, rotary switches, etc., panel installation is adopted, that is, only the side that needs to be operated is exposed to the outside, and other parts of the equipment are hidden inside the equipment, which not only increases the operability, but also increases the beauty of the appearance, and is simple and easy to operate.

[0046] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting the capacitive life of a DC contactor, characterized in that: The invention comprises a cabinet frame (1) and a mechanical support part (2) arranged in the cabinet frame, wherein mounting holes arranged according to a predetermined size pattern are respectively arranged on the cabinet frame, and the mechanical support part is assembled on the cabinet frame through the mounting holes and divides the cabinet frame into a plurality of test circuit component installation and placement intervals, which are a first installation interval, a second installation interval, a third installation interval and a fourth installation interval from bottom to top, wherein a plurality of capacitors (310) are arranged in the first installation interval, an industrial computer (306) and a DC power supply (307) are arranged in the second installation interval, a keyboard and mouse chassis (305) and a cooling fan (309) are arranged in the third installation interval, and a plurality of resistors (308) are arranged in the fourth installation interval; and a test sample test chamber (112) is also arranged on the front panel (111) of the cabinet frame, for connecting the test sample to the test circuit for life detection.

2. The device for detecting the capacitive electrical life of a DC contactor according to claim 1, characterized in that: The bottom of the cabinet frame is hollowed out and fixedly installed with a dense steel wire mesh, and movable casters (109) are fixedly installed at the four corners; the top of the cabinet frame is detachably provided with a mesh structured top cover (110), and hanging rings are provided at the four corners; a rear door with a double-door structure is symmetrically provided on the rear side of the cabinet frame; and sealing plates are provided on the left and right sides of the cabinet frame.

3. The device for detecting the capacitive electrical life of a DC contactor according to claim 2, characterized in that: The front panel is provided with a control panel and an operation panel, wherein the control panel includes an operable part of a display, an industrial computer and / or a keyboard and mouse chassis, and is used to set parameters and perform disconnection control on the test circuit; the operation panel includes a rotary switch (304) and a sample test chamber, and the rotary switch is used to adjust the impedance gear.

4. The device for detecting the capacitive electrical life of a DC contactor according to claim 1, characterized in that: The mechanical support part comprises a plurality of side beams (201) arranged on the upper side of the cabinet frame, and a plurality of supporting beams (202) penetrating the interior of the cabinet frame and transversely arranged between two side beams.

5. The device for detecting the capacitive life of a DC contactor according to claim 4, characterized in that: The side crossbeam is a C-shaped structure, and the three sides of the C-shaped structure are respectively provided with mounting holes arranged according to the module E=20mm. The supporting crossbeam is a C-shaped structure, and the top surface is provided with mounting holes arranged according to E=45mm. The side crossbeam is installed on the cabinet frame through the mounting holes, and the two ends of the supporting crossbeam are installed on the side crossbeam through the mounting holes.

6. The device for detecting the capacitive life of a DC contactor according to claim 1, characterized in that: An explosion-proof isolation plate (302) is provided between the first installation interval and the second installation interval.

7. The device for detecting the capacitive life of a DC contactor according to claim 1, characterized in that: A fan fixing plate is horizontally arranged in the third installation area, and the heat dissipation fan is arranged on the fan fixing plate.

8. The device for detecting the capacitive life of a DC contactor according to claim 1, characterized in that: The sample test chamber is provided with a plurality of sample access positions for connecting the sample to the test circuit for life detection.

9. The device for detecting the capacitive life of a DC contactor according to claim 8, characterized in that: The sample testing room is hingedly provided with a side-opening experimental door (1122), and explosion-proof glass is provided on the experimental door.

10. The device for detecting the capacitive life of a DC contactor according to claim 9, characterized in that: An epoxy board (1121) is also arranged at the rear of the sample testing room and opposite to the experimental door, and the sample access position is arranged on the epoxy board.

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