Direct current load testing device for charging pile

Abstract

The utility model discloses a charging pile direct current load test device, including outer frame and inner frame, the inner frame is connected in the outer frame, the both sides of inner frame are fixed with a plurality of upper and lower distribution's resistance support, the resistance support is inserted with a plurality of resistance tube, the both sides surface of inner frame all are fixed with mounting panel, the both sides mounting panel all are fixed with a plurality of direct current contactor, one side direct current contactor is connected together through shunt, the resistance tube is connected in parallel on direct current contactor, the resistance tube is divided into multiple groups, the number of direct current contactor and the group number of resistance tube correspond, and the resistance tube of different groups is matched with charging power, the utility model discloses parallel connection resistance tube on a plurality of direct current contactor, and direct current contactor is connected together through shunt, when the load test of charging pile, the on-off of different direct current contactor is controlled to adjust the load size, satisfies the demand of test, and the test efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of charging pile testing equipment, specifically a DC load testing device for charging piles. Background Technology

[0002] In existing technologies, DC charging piles typically require multiple tests, including temperature rise testing, safety testing, batch aging testing, and other factory tests. Current testing methods primarily involve testing each charging pile independently with a corresponding resistive load. Different load devices handle different power outputs, and a single load device can only test charging piles with a limited power rating, resulting in a narrow testing range. Furthermore, additional load devices need to be purchased when producing charging piles with different power ratings, leading to high equipment costs. Therefore, to improve the applicability of the load testing equipment and meet the testing needs of charging piles with different power ratings, this DC load testing device for charging piles was designed. Utility Model Content

[0003] The purpose of this invention is to provide a DC load testing device for charging piles. By connecting resistors in parallel with multiple DC contactors and connecting the DC contactors together through a shunt, the load size can be adjusted by controlling the on / off state of different DC contactors during the load test of the charging pile, thereby meeting the test requirements and improving the test efficiency.

[0004] This utility model provides the following technical solution: a DC load testing device for charging piles, comprising an outer frame and an inner frame, wherein the inner frame is connected within the outer frame, and multiple vertically distributed resistor supports are fixed on both sides of the inner frame, wherein multiple resistor tubes are inserted into the resistor supports, and mounting plates are fixed on both sides of the inner frame, the mounting plates being located on the other side of the resistor supports, and multiple DC contactors are fixed on the mounting plates on both sides, wherein the DC contactors on one side are positive and the DC contactors on the other side are negative, the DC contactors on one side are connected together through a shunt, the resistor tubes are connected in parallel to the DC contactors, the resistor tubes are divided into multiple groups, the number of DC contactors corresponds to the number of groups of resistor tubes, and different groups of resistor tubes are matched with the charging power.

[0005] According to the above technical solution, a fan mounting plate is fixed on one side of the outer frame, and multiple fans are mounted on the fan mounting plate. A heat sink is fixed on the other side of the outer frame. The heat sink and the fan mounting plate are arranged opposite to each other. The resistor tube is located between the heat sink and the fan. By using the relative arrangement of the heat sink and the fan, the heat on the resistor tube is carried away by the airflow, thereby reducing the internal temperature of the equipment.

[0006] According to the above technical solution, a control unit is connected to one side of the outer frame. The control unit includes a circuit breaker, a switching power supply, a relay, and multiple buttons. The circuit breaker is used to control the on / off state of the input power supply. The switching power supply converts 220VAC power to 12VDC output. The relay and buttons are used together to achieve quick on / off current switching.

[0007] According to the above technical solution, the button includes a power button, an emergency stop button, and a button group corresponding to the DC contactor. The power button and the relay control the on / off of the input power of the AC fan, and the emergency stop button and the relay control the on / off of the output of the switching power supply.

[0008] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: by connecting resistor tubes in parallel on multiple DC contactors and connecting the DC contactors together through a shunt, the current magnitude can be adjusted by switching the DC contactors on and off during the load test of the charging pile, thereby further adjusting the load. By controlling the on and off of different DC contactors to adjust the load magnitude, this load testing device is convenient to test, has a wide range of applications, and can meet the testing needs of charging piles with different power. At the same time, the on and off of the DC contactors can be controlled by buttons, which improves the testing efficiency. Attached Figure Description

[0009] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0010] Figure 1 This is a perspective view of the overall structure of this utility model;

[0011] Figure 2 This is a perspective view of the internal structure of this utility model;

[0012] Figure 3 This is a perspective view of the internal structure of this utility model from another angle;

[0013] Figure 4 This is a perspective view of the internal structure of this utility model from another side;

[0014] In the diagram: 1. Heat sink; 2. Control unit; 3. Fan mounting plate; 31. Fan; 4. Inner frame; 41. Resistor bracket; 42. Resistor tube; 43. Mounting plate; 44. DC contactor; 45. Shunt; 5. Outer frame. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1 to 4 This utility model provides a technical solution: a DC load testing device for charging piles, including an outer frame 5 and an inner frame 4. The inner frame 4 is welded inside the outer frame 5. Multiple vertically distributed resistor supports 41 are fixed on both sides of the inner frame 4. Each resistor support 41 is a strip plate correspondingly distributed on both sides. Multiple resistor tubes 42 are inserted and fixed along the strip plates inside the resistor supports 41. Mounting plates 43 are fixed on both sides of the inner frame. The mounting plates 43 are located on the other side of the resistor supports 41. Multiple DC contactors 44 are fixed on both mounting plates 43. One side of the DC contactor 44 is the positive terminal, and the other side is the negative terminal. The DC contactors 44 on one side are connected together through a shunt 45. The resistor tubes 42 are connected in parallel to the DC contactors 44. The resistor tubes 42 are divided into multiple groups. The number of resistors 42 corresponds to the number of groups of resistors 42. Different groups of resistors 42 are matched with the charging power. In this embodiment, there are 96 resistors 42, divided into 7 groups. The first 5 groups have 12 resistors each, and the last 2 groups have 18 resistors each. There are 14 DC contactors 44, in pairs, for a total of 7 groups. When the charging power is high, any group of resistors 42 from the last two groups is connected. When the charging power is low, any group of resistors 42 from the first five groups is connected. By setting multiple groups of resistors 42, different groups of resistors 42 are connected for different charging power, simulating the charging power of different charging piles, thereby performing load testing. One device can perform load testing on multiple charging piles with different power, reducing equipment costs and enabling different charging piles to be tested during the production process using this device.

[0017] like Figure 3 and 4 As shown, a fan mounting plate 3 is fixed on one side of the outer frame 5, and multiple fans 31 are mounted on the fan mounting plate 3. The fans 31 are AC fans. A heat sink 1 is fixed on the other side of the outer frame 5. The heat sink 1 and the fan mounting plate 3 are arranged opposite to each other. The resistor tube 42 is located between the heat sink 1 and the fans 31. The fans 31 draw in outside air and exhaust it from the heat sink 1. During the air circulation, the heat on the resistor tube 42 is carried away, which reduces the internal temperature of the test device.

[0018] like Figure 1 and 3As shown, a control unit 2 is connected to one side of the outer frame 5. The control unit 2 includes a circuit breaker, a switching power supply, a relay, and multiple buttons. The circuit breaker is used to control the on / off state of the input power supply. The switching power supply converts 220VAC power to 12VDC output. The relay and buttons are used together to achieve quick on / off current switching.

[0019] The buttons include a power button, an emergency stop button, and a button group corresponding to the DC contactor 44. The power button and relay control the on / off of the input power of the AC fan, the emergency stop button and relay control the on / off of the output of the switching power supply, and the buttons are used to control the on / off of the control circuit.

[0020] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A DC load testing device for charging piles, comprising an outer frame and an inner frame, characterized in that: The inner frame is connected to the outer frame. Multiple resistor supports are fixed on both sides of the inner frame, and multiple resistor tubes are inserted into the resistor supports. Mounting plates are fixed on both sides of the inner frame, and the mounting plates are located on the other side of the resistor supports. Multiple DC contactors are fixed on the mounting plates on both sides. The DC contactors on one side are positive and the DC contactors on the other side are negative. The DC contactors on one side are connected together through a shunt. The resistor tubes are connected in parallel to the DC contactors. The resistor tubes are divided into multiple groups. The number of DC contactors corresponds to the number of groups of resistor tubes. Different groups of resistor tubes are matched with the charging power.

2. The charging pile DC load testing device according to claim 1, characterized in that: A fan mounting plate is fixed on one side of the outer frame, and multiple fans are mounted on the fan mounting plate. A heat sink is fixed on the other side of the outer frame. The heat sink and the fan mounting plate are arranged opposite to each other, and the resistor tube is located between the heat sink and the fans.

3. The charging pile DC load testing device according to claim 1, characterized in that: A control unit is connected to one side of the outer frame. The control unit includes a circuit breaker, a switching power supply, a relay, and multiple buttons. The circuit breaker is used to control the on / off state of the input power supply. The switching power supply converts 220VAC power to 12VDC output. The relay and buttons are used together to achieve quick on / off current switching.

4. The charging pile DC load testing device according to claim 3, characterized in that: The buttons include a power button, an emergency stop button, and a button group corresponding to the DC contactor. The power button and relay control the on / off of the input power of the AC fan, and the emergency stop button and relay control the on / off of the output of the switching power supply.

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