Load detection device

Abstract

The invention provides a load detection device. The load detection device comprises a control assembly, a load switching assembly and a load assembly, the load assembly comprises a load box body, an alternating current load structure and a direct current load structure; the load switching assembly is used for switching the alternating current to be communicated with the alternating current load structure and switching the direct current to be communicated with the direct current load structure; a plurality of ventilation holes are formed in the load box body; each of the alternating current load structure and the direct current load structure comprises a plurality of resistive load units; the resistance load unit comprises a heat dissipation air pipe, a resistance wire and a heat dissipation fan; the resistance wire is used for providing a resistance load, at least one part of the resistance wire is arranged in the heat dissipation air pipe, and the heat dissipation fan is communicated with the interior of the heat dissipation air pipe and at least one ventilation hole; the cooling fan drives airflow to flow through the resistance wire along the interior of the cooling air pipe so as to conduct convection heat dissipation. The load box solves the problems that in the prior art, a load box is poor in compatibility, and the testing efficiency and the heat dissipation efficiency of a load are low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging pile detection, in particular to a load detection device. BACKGROUND

[0002] In the field of testing new energy vehicle charging piles, the existing load box for detecting charging piles has many limitations, which directly affects the efficiency, accuracy and convenience of the operator.

[0003] The existing load box mainly has the following deficiencies: 1. Poor compatibility and low test efficiency; the existing load box scheme usually adopts a discrete design, i.e. AC and DC load devices run independently, which cannot achieve integrated integration in a single device; and most of the existing load boxes are designed for a single current type, lacking of AC and DC switching function, which means that the tester needs to equip multiple devices to meet the testing needs of different charging piles, which not only increases the complexity of device management, but also reduces the test efficiency; at the same time, it also means that when testing different types of charging piles (AC or DC), the load device needs to be frequently replaced, which not only complicates the operation, but also significantly increases the test cost and time; 2. Low heat dissipation efficiency of the load; in the high-power test scenario, the resistance element will generate a large amount of heat, but the heat dissipation structure of the traditional load box usually adopts a simple air cooling scheme, which has low heat dissipation efficiency and cannot effectively control the temperature rise, which not only may cause the device to appear overheat protection and thus interrupt the test, but also reduces the test accuracy and the service life of the device.

[0004] Therefore, the existing load box for detecting charging piles mainly has the problems of poor compatibility, low test efficiency and low heat dissipation efficiency of the load, which need to be solved urgently. SUMMARY

[0005] The present application provides a load detection device to solve the problem of poor compatibility, low test efficiency and low heat dissipation efficiency of the load in the prior art.

[0006] To address the aforementioned problems, this invention provides a load detection device, comprising: a control component, a load switching component, and a load component; the load component includes a load housing, an AC load structure, and a DC load structure; the load switching component is electrically connected to the control component; the charging pile to be tested is scalably connected to the load switching component; the load switching component is used to switch the AC power supply to the AC load structure and the DC power supply to the DC load structure for corresponding testing; the load housing has multiple ventilation holes, which are respectively connected to the interior and exterior of the load housing; the AC load structure and the DC load structure are respectively electrically connected to the control component; both the AC load structure and the DC load structure include multiple resistive load units, which are spaced apart within the load housing; each resistive load unit includes a heat dissipation duct, a resistance wire, and a cooling fan; the resistance wire provides the resistive load, at least a portion of which is disposed within the heat dissipation duct, and the cooling fan is respectively connected to the interior of the heat dissipation duct and at least one ventilation hole; the cooling fan drives airflow along the interior of the heat dissipation duct through the resistance wire for convective heat dissipation.

[0007] Furthermore, the resistance wires in a portion of the multiple resistive load units are connected in series, and the resistance wires in a portion of the multiple resistive load units are connected in parallel; the resistive load unit also includes: a heat sink bracket having multiple heat sink fins; the heat sink bracket is disposed inside the heat sink duct; at least a portion of the resistance wire is wound around the heat sink bracket and extends along the axial direction of the heat sink bracket; the heat sink fins protrude radially from the heat sink bracket along the heat sink duct; the cooling fan drives airflow to flow through the heat sink fins along the interior of the heat sink duct for convective heat dissipation.

[0008] Furthermore, at least a portion of the multiple heat dissipation fins are equidistantly spaced along the axial direction of the heat dissipation bracket, and a portion of the resistance wire is sequentially wound between two adjacent heat dissipation fins and is matched with the heat dissipation fins for limiting.

[0009] Furthermore, the resistive load unit also includes a fixed bracket, which is detachably connected to the end of the heat dissipation duct facing the heat dissipation fan; the heat dissipation fan is detachably connected to the heat dissipation duct; wherein, the end of the heat dissipation bracket near the heat dissipation fan has a limiting piece, the fixed bracket has a limiting groove, a part of the limiting piece extends into the limiting groove and is limited and engaged with the inner wall of the limiting groove.

[0010] Furthermore, the limiting piece includes a first piece and a second piece, the extension direction of the first piece and the extension direction of the second piece are respectively parallel to the radial direction of the heat dissipation duct, and the extension direction of the first piece and the extension direction of the second piece have an angle; the limiting groove includes a first groove and a second groove, the first groove corresponds to and cooperates with the first piece, and the second groove corresponds to and cooperates with the second piece; and / or, the axial direction of the heat dissipation bracket is arranged parallel to the axial direction of the heat dissipation duct; the heat dissipation bracket is made of mica material or metal material.

[0011] Further, the control assembly comprises a display screen, control buttons, a central controller and a battery; the display screen is electrically connected with the central controller and is used for displaying detection results; the control buttons are electrically connected with the central controller and are used for controlling the central controller; the battery is connected with the central controller through a circuit and is used for providing electric energy; the central controller is electrically connected with the load switching assembly, the alternating current load structure and the direct current load structure respectively to control the load switching assembly, the alternating current load structure and the direct current load structure to work cooperatively; wherein, the central controller is provided with a plurality of data connection interfaces, the data connection interfaces are used for transmitting data, one data connection interface is used for connecting with the to-be-detected charging pile to receive output data of the to-be-detected charging pile; the battery is provided with a charging interface, the charging interface is used for connecting with an external power supply to charge the battery.

[0012] Further, the load switching assembly comprises a direct current gun seat and an alternating current gun seat, the direct current gun seat is used for detachably connecting with a direct current charging gun of the to-be-detected charging pile, and the alternating current gun seat is used for detachably connecting with an alternating current charging gun of the to-be-detected charging pile; the direct current gun seat is connected with the direct current load structure through a circuit, and the alternating current gun seat is connected with the alternating current load structure through a circuit; and / or, the control assembly corresponds to match the number of resistance load units used as loads in the circuit according to the power of the to-be-detected charging pile.

[0013] Further, the load assembly is a plurality of load assemblies, and a part of the plurality of load assemblies are connected in series to improve the load; and / or, the resistance load unit further comprises a temperature sensor, the temperature sensor is electrically connected with the control assembly; the temperature sensor is arranged in the heat dissipation air pipe, and is used for detecting the temperature of the resistance wire; and / or, the load detection device further comprises a voltage detector, the voltage detector is used for detecting the voltage of the load assembly.

[0014] Further, the load switching assembly comprises a switching circuit and a relay, the relay is arranged on the switching circuit and is used for switching the switching circuit to be in communication with the alternating current load structure or the direct current load structure to correspondingly perform testing; and / or, the load switching assembly comprises a protection circuit, the protection circuit is connected with the alternating current load structure and the direct current load structure respectively, and is used for protection when overloading or short circuiting occurs in the alternating current load structure or the direct current load structure.

[0015] Further, the load detection device further comprises a bearing box and a plurality of universal wheels, the plurality of universal wheels are arranged at the bottom of the bearing box and are used for supporting the bearing box; the universal wheels have a self-locking function, and when the universal wheels are locked, the universal wheels do not rotate to fix the bearing box; the control assembly, the load switching assembly and the load assembly are arranged on the bearing box respectively; and / or, the bearing box is made of a galvanized sheet material, and at least a part of the surface of the bearing box is subjected to plastic corrosion-resistant treatment.

[0016] The technical scheme of the present application provides a load detection device, which comprises a control component, a load switching component and a load component; the load component comprises a load box, an alternating current load structure and a direct current load structure; the load switching component is electrically connected with the control component; a to-be-detected charging pile is connected with the load switching component in an on-off manner; the load switching component is used for switching alternating current to communicate with the alternating current load structure and switching direct current to communicate with the direct current load structure to correspondingly perform testing; the load box is provided with a plurality of ventilation holes, which respectively communicate with the inside and outside of the load box; the alternating current load structure and the direct current load structure are electrically connected with the control component; the alternating current load structure and the direct current load structure each comprise a plurality of resistance load units, which are arranged at intervals in the load box; the resistance load unit comprises a heat dissipation air pipe, a resistance wire and a heat dissipation fan; the resistance wire is used for providing resistance load, at least a part of the resistance wire is arranged in the heat dissipation air pipe, and the heat dissipation fan respectively communicates with the inside of the heat dissipation air pipe and at least one ventilation hole; the heat dissipation fan drives airflow to flow through the resistance wire along the inside of the heat dissipation air pipe to perform convection heat dissipation.

[0017] The load switching component is arranged to switch alternating current to communicate with the alternating current load structure and switch direct current to communicate with the direct current load structure, so that different current types can be tested respectively; the control component, the load switching component and the load component are arranged to work in cooperation to realize integrated integration of alternating current detection and direct current detection functions, so that a worker can test different charging piles only by using one load detection device, thereby effectively improving test efficiency, reducing operation complexity, test cost and test time; the heat dissipation air pipe, the resistance wire and the heat dissipation fan are arranged to work in cooperation to realize reliable heat dissipation of the load by using a simple structure, thereby improving heat dissipation efficiency of the load, avoiding interruption of testing of the load detection device due to overheating protection, effectively ensuring test accuracy and improving service life of the device; the present application has simple structure and low cost, is convenient to assemble and maintain, solves the problems of poor compatibility, low test efficiency and low heat dissipation efficiency of the load in the prior art, and has significant improvement in heat dissipation performance, operation convenience, maintenance simplicity and power bearing capacity, thereby providing a more efficient, reliable and convenient solution for performance testing of the automobile charging pile and being suitable for large-scale popularization and use. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application, explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 An external structure schematic diagram of the load detection device provided by the embodiment of the present application is shown.

[0020] Figure 2 An external structure diagram of a partial structure of a load assembly provided by an embodiment of the present application is shown;

[0021] Figure 3 An exploded view of a partial structure of a resistance load unit provided by an embodiment of the present application is shown;

[0022] Figure 4 An external structure diagram of a resistance load unit provided by an embodiment of the present application is shown;

[0023] Figure 5 A partial structure diagram of a load detection device provided by an embodiment of the present application is shown;

[0024] Figure 6 An internal structure diagram of a load detection device provided by another embodiment of the present application is shown.

[0025] Among the above-mentioned drawings, the following reference signs are included:

[0026] 10, control assembly; 11, display screen; 12, control button; 13, data connection interface; 14, charging interface;

[0027] 20, load assembly; 21, load box body; 211, ventilation hole; 22, resistance load unit; 221, heat dissipation air pipe; 222, resistance wire; 223, heat dissipation fan; 224, heat dissipation support; 225, heat dissipation fin; 226, fixing support; 227, limiting sheet; 228, limiting groove;

[0028] 30, load switching assembly; 31, direct current gun seat; 32, alternating current gun seat;

[0029] 40, bearing box body;

[0030] 50, universal wheel. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work, are within the scope of protection of the present application.

[0032] As Figures 1 to 6As shown, the embodiment of the present application provides a load detection device, comprising: a control assembly 10, a load switching assembly 30 and a load assembly 20; the load assembly 20 comprises a load box 21, an AC load structure and a DC load structure; the load switching assembly 30 is electrically connected with the control assembly 10; a to-be-detected charging pile is connected with the load switching assembly 30 in an on-off manner; the load switching assembly 30 is used for switching AC power to be communicated with the AC load structure and switching DC power to be communicated with the DC load structure, so as to correspondingly perform testing; the load box 21 is provided with a plurality of ventilation holes 211, and the ventilation holes 211 are respectively communicated with the inside and outside of the load box 21; the AC load structure and the DC load structure are electrically connected with the control assembly 10; the AC load structure and the DC load structure both comprise a plurality of resistance load units 22, and the resistance load units 22 are arranged at intervals in the load box 21; the resistance load unit 22 comprises a heat dissipation air pipe 221, a resistance wire 222 and a heat dissipation fan 223; the resistance wire 222 is used for providing resistance load, at least a part of the resistance wire 222 is arranged in the heat dissipation air pipe 221, and the heat dissipation fan 223 is respectively communicated with the inside of the heat dissipation air pipe 221 and at least one ventilation hole 211; the heat dissipation fan 223 drives airflow to flow through the resistance wire 222 along the inside of the heat dissipation air pipe 221, so as to perform convection heat dissipation.

[0033] The present application sets the load switching assembly 30, so that the load switching assembly 30 switches AC power to be communicated with the AC load structure and switches DC power to be communicated with the DC load structure, thereby corresponding different current types can be tested respectively; the control assembly 10, the load switching assembly 30 and the load assembly 20 work cooperatively, the integration of AC detection and DC detection functions is realized, so that the staff only needs one load detection device to realize the testing of different charging piles, thereby effectively improving the testing efficiency, reducing the operation complexity, testing cost and testing time; the heat dissipation air pipe 221, the resistance wire 222 and the heat dissipation fan 223 work cooperatively, the reliable heat dissipation of the load is realized by using a simple structure, the heat dissipation efficiency of the load is improved, thereby avoiding the problem that the load detection device is interrupted due to overheating protection, effectively ensuring the testing accuracy and improving the service life of the device; the present application has simple structure and low cost, is convenient to assemble and maintain, solves the problems of poor compatibility, low testing efficiency and low heat dissipation efficiency of the load in the prior art, and overall, the present application has significant improvement in heat dissipation performance, operation convenience, maintenance simplicity and power bearing capacity, provides a more efficient, reliable and convenient solution for performance testing of the automobile charging pile, and is suitable for large-scale popularization and use.

[0034] It should be noted that in one embodiment of the present application, the load in the alternating current circuit and the load in the direct current circuit have certain differences in design principles, working characteristics, etc. The differences between the two are described in detail as follows: 1. Design principle: The load in the direct current circuit is designed based on the property of constant direct current, which means that the direction of the current will not change over time. Such a load usually uses purely resistive elements, such as resistors, heating elements, etc., because resistive loads are the most basic and easiest to handle for direct current; the load in the alternating current circuit needs to consider the periodic change characteristics of alternating current. The voltage and current of alternating current change in the form of a sine wave, which requires the load to have the ability to handle such changes. In addition to resistive, the alternating current load may also include inductive and capacitive loads, such as motors, transformers, fluorescent lamp ballasts, etc., which can store energy in alternating current and release it within half a cycle, thereby adapting to the changes in alternating current. 2. Working characteristics: Under direct current, the power consumed by the load is proportional to the product of voltage and current, i.e. P = V * I. The power consumption of a resistive load in direct current is relatively stable and not prone to fluctuations; the power calculation of an alternating current load is more complex, in addition to considering the product of instantaneous voltage and current, it also needs to consider the power factor. The power factor of a purely resistive alternating current load is close to 1, while a load containing inductance or capacitance will have a lower power factor, resulting in actual power lower than the theoretical value. In addition, alternating current loads may also produce harmonic interference, which is a problem that is not usually encountered in direct current loads. 3. Thermal effect and loss: The thermal effect of a load in a direct current circuit mainly depends on the resistance value and the size of the current passing through. The thermal loss of a direct current load is relatively stable and easy to predict and control. The thermal effect of an alternating current load is not only affected by the size of the current, but also related to its working frequency. At a certain frequency, some inductive loads may produce high iron loss or copper loss, resulting in additional thermal effects. The design of an alternating current load needs to consider these frequency-dependent losses. 4. Testing and diagnosis: Direct current load testing is relatively simple, usually only measuring voltage, current and power under steady-state conditions; alternating current load testing needs to consider frequency response, phase relationship, power factor, harmonic component, etc., and the testing method and instrument are more complex. Therefore, when designing a load detection device, an alternating current load requires additional functions and complexity to adapt to the characteristics of alternating current, while a direct current load mainly focuses on the stability and efficiency of resistive loads. The load detection device proposed in the present application realizes integrated detection of alternating current and direct current, and needs to consider the above factors to ensure that the load detection device can efficiently and accurately detect the charging pile in both circuits, simulating the real load condition.

[0035] As Figure 2 , Figure 3 and Figure 4As shown, some of the resistor wires 222 in the multiple resistor load units 22 are connected in series, and some of the resistor wires 222 in the multiple resistor load units 22 are connected in parallel. The resistor load unit 22 also includes: a heat sink bracket 224, which has multiple heat sink fins 225. The heat sink bracket 224 is disposed inside the heat sink duct 221. At least a portion of the resistor wires 222 are wound around the heat sink bracket 224 and extend along the axial direction of the heat sink bracket 224. The heat sink fins 225 protrude from the heat sink bracket 224 along the radial direction of the heat sink duct 221. The cooling fan 223 drives the airflow to flow through the heat sink fins 225 along the interior of the heat sink duct 221 for convective heat dissipation.

[0036] By connecting the series and parallel resistance wires 222, load adjustability is achieved, allowing for flexible adjustment of the load according to the power requirements of the charging pile under test. The heat dissipation fins 225 increase the heat dissipation area and improve heat dissipation efficiency, while the airflow driven by the cooling fan 223 passes through the heat dissipation fins 225, further enhancing the convective heat dissipation effect. The above technical solution effectively controls the temperature inside the load housing 21, ensuring that the load detection device maintains a stable operating state under high-power testing scenarios. In other embodiments, heat dissipation fins 225 made of different materials, such as copper or aluminum, can be used to improve heat dissipation performance and solve the heat dissipation problem during high-power testing.

[0037] like Figure 3 As shown, at least a portion of the multiple heat dissipation fins 225 are equidistantly spaced along the axial direction of the heat dissipation bracket 224, and a portion of the resistance wire 222 is wound sequentially between two adjacent heat dissipation fins 225 and is positioned and engaged with the heat dissipation fins 225.

[0038] By arranging the heat dissipation fins 225 at equal intervals, the uniformity and stability of the resistance wire 222 during winding are ensured, thereby improving heat dissipation efficiency. The limiting fit between the heat dissipation fins 225 and the resistance wire 222 reduces the vibration of the resistance wire 222 during operation, lowering the risk of breakage due to vibration. The above technical solution can improve the reliability and safety of the load detection device and extend the service life of the equipment. In other embodiments, the shape and size of the heat dissipation fins 225 can be optimized to adapt to different power testing requirements and solve the heat dissipation problem under specific power testing.

[0039] like Figure 3As shown, the resistance load unit 22 further comprises a fixed bracket 226 detachably connected with one end of the heat dissipation air duct 221 facing the heat dissipation fan 223; the heat dissipation fan 223 is detachably connected with the heat dissipation air duct 221; wherein the heat dissipation bracket 224 has a limiting piece 227 at one end close to the heat dissipation fan 223, and the fixed bracket 226 has a limiting groove 228, a part of the limiting piece 227 extends into the limiting groove 228 and is limitedly matched with the inner wall of the limiting groove 228.

[0040] Through the detachable connection design, the resistance load unit 22 is easy to replace and maintain, improving the flexibility and maintenance efficiency of the equipment. The cooperation of the limiting piece 227 and the limiting groove 228 ensures the stable position of the heat dissipation bracket 224 in the heat dissipation air duct 221, avoiding the decline of heat dissipation efficiency caused by position movement. The technical scheme thus arranged can improve the heat dissipation effect and overall stability of the load detection device, prolonging the service life of the equipment. In other embodiments, the structure of the limiting piece 227 and the limiting groove 228 can be optimized to improve the connection strength between the fixed bracket 226 and the heat dissipation air duct 221, solving the problem of structural stability during high-power testing.

[0041] As shown in the drawings, Figure 3 The limiting piece 227 comprises a first piece and a second piece, the extension direction of the first piece and the extension direction of the second piece are respectively parallel to the radial direction of the heat dissipation air duct 221, and the extension direction of the first piece and the extension direction of the second piece have an included angle; the limiting groove 228 comprises a first groove and a second groove, the first groove corresponds to the first piece, and the second groove corresponds to the second piece; and / or, the axial direction of the heat dissipation bracket 224 is parallel to the axial direction of the heat dissipation air duct 221; the heat dissipation bracket 224 is made of mica material or metal material.

[0042] Through the specific design of the limiting piece 227, the precise positioning of the heat dissipation bracket 224 in the heat dissipation air duct 221 is ensured, improving the stability and reliability of the heat dissipation structure. The selection of mica material or metal material can optimize the heat dissipation effect and overall cost of the heat dissipation bracket 224 according to its heat conduction performance and cost. The above technical scheme can improve the heat dissipation performance and structural stability of the load detection device, ensuring the normal operation of the equipment in high-power testing scenarios. In other embodiments, other high-thermal-conductivity materials such as copper or aluminum can be used to further improve the heat dissipation efficiency of the heat dissipation bracket 224, solving the heat dissipation problem during high-power testing.

[0043] As shown in the drawings, Figure 1 and Figure 5As shown, the control assembly 10 includes a display screen 11, control buttons 12, a central controller, and a battery. The display screen 11 is electrically connected to the central controller for displaying test results. The control buttons 12 are electrically connected to the central controller for controlling the central controller. The battery is connected to the central controller through a circuit for providing power. The central controller is electrically connected to the load switching assembly 30, the AC load structure, and the DC load structure to control their cooperative work. The central controller has multiple data connection interfaces 13 for transmitting data, one of which is used to connect with the charging pile to be tested to receive its output data. The battery has a charging interface 14 for connecting with an external power source to charge the battery.

[0044] By integrating the control assembly 10, comprehensive control and data management of the load detection device are achieved, improving the intelligent level of the equipment. The central controller controls the load switching assembly 30 to switch the AC and DC load structures, and provides a user-friendly operation interface through the display screen 11 and the control buttons 12. The above technical solution can improve the operation convenience and data processing capacity of the load detection device, making the testing process more efficient and accurate. In other embodiments, a wireless communication module can be added to realize remote data transmission and control, solving the communication problem during on-site testing.

[0045] As shown in Figure 1 and Figure 5 The load switching assembly 30 includes a DC gun seat 31 and an AC gun seat 32. The DC gun seat 31 is used for detachable connection with the DC charging gun of the charging pile to be tested, and the AC gun seat 32 is used for detachable connection with the AC charging gun of the charging pile to be tested. The DC gun seat 31 is connected to the DC load structure through a circuit, and the AC gun seat 32 is connected to the AC load structure through a circuit. In addition, the control assembly 10 matches the number of resistance load units 22 connected to the circuit as load according to the power of the charging pile to be tested.

[0046] By setting the DC gun seat 31 and the AC gun seat 32, compatible connection with different types of charging piles is achieved, improving the universality of the equipment. In principle, the control assembly 10 automatically adjusts the number of resistance load units 22 connected to the circuit according to the power demand of the charging pile, ensuring the test accuracy and efficiency of the load detection device. The above technical solution can improve the test adaptability and automation level of the load detection device, reducing the work burden of the operator. In other embodiments, an automatic identification module can be added to automatically identify the type and power of the charging pile, further optimizing the testing process and solving the problem of operation complexity.

[0047] Specifically, the plurality of load assemblies 20 are arranged in series to improve the load; and / or, the resistance load unit 22 further comprises a temperature sensor electrically connected to the control assembly 10; the temperature sensor is arranged in the heat dissipation air pipe 221 and is used to detect the temperature of the resistance wire 222; and / or, the load detection device further comprises a voltage detector used to detect the voltage of the load assembly 20.

[0048] Through the series arrangement of the plurality of load assemblies 20, the power expansion capability of the load detection device is realized, and the test requirements of different power charging piles are met. The temperature sensor is arranged, so that the control assembly 10 can monitor the temperature of the resistance wire 222 in real time, and the heat dissipation strategy can be adjusted in time to avoid overheating. The above technical scheme can improve the test range and safety of the load detection device, and ensure the stable operation of the equipment in various test scenarios. In other embodiments, a temperature control module can be added to automatically adjust the speed of the heat dissipation fan 223 to adapt to the heat dissipation requirements under different power tests, and solve the problem of heat dissipation efficiency.

[0049] Optionally, the load switching assembly 30 comprises a switching circuit and a relay arranged on the switching circuit and used to switch the switching circuit to be in communication with an alternating current load structure or a direct current load structure to correspond to the test; and / or, the load switching assembly 30 comprises a protection circuit connected to the alternating current load structure and the direct current load structure respectively, and the protection circuit is used to protect when the alternating current load structure or the direct current load structure is overloaded or short-circuited.

[0050] Through the arrangement of the relay, the automatic switching function of the load switching assembly 30 is realized, and the intelligent level of the equipment is improved. The integration of the protection circuit ensures that the load detection device can be automatically disconnected under abnormal conditions such as overload or short circuit, and equipment damage is avoided. The above technical scheme can improve the test safety and reliability of the load detection device, and reduce the equipment failure rate. In other embodiments, a fault self-diagnosis module can be added to realize self-detection and fault warning of the equipment, further improve the operation safety of the equipment, and solve the equipment maintenance problem.

[0051] As shown in Figure 1 and Figure 6 , the load detection device further comprises a bearing box 40 and a plurality of universal wheels 50 arranged at the bottom of the bearing box 40 and used to support the bearing box 40; the universal wheel 50 has a self-locking function, and when the universal wheel 50 is locked, the universal wheel 50 does not rotate to fix the bearing box 40; the control assembly 10, the load switching assembly 30 and the load assembly 20 are arranged on the bearing box 40; and / or, the bearing box 40 is made of galvanized sheet material, and at least a part of the surface of the bearing box 40 is subjected to plastic corrosion-resistant treatment.

[0052] By setting the bearing box 40 and the universal wheel 50, the portability and stability of the load detection device are realized, and the on-site adaptability of the equipment is improved. The use of galvanized sheet material and plastic spraying corrosion prevention treatment enhances the corrosion resistance and protection performance of the bearing box 40, prolonging the service life of the equipment. In this way, the portability and protection performance of the load detection device can be improved, ensuring the normal operation of the equipment in harsh environments. In other embodiments, the stability and durability of the equipment can be further improved by adding shockproof design to solve the shockproof problem of the equipment during transportation and use.

[0053] Now the working process and principle of one specific embodiment of the application are described in detail as follows:

[0054] The resistance wire 222 is made of high-resistivity and high-temperature-resistant alloy resistance wire; the cooling fan 223 is a powerful fan with a peak speed of up to 20,000 rpm, the cooling air duct 221 is made of aluminum alloy cylinder structure, and the cooling air duct 221 also has 2 layers of mica plates for heat insulation to effectively isolate the heat generated by the resistance wire 222 from other positions of the load box 21; the data connection interface and the charging interface adopt type-c interface, the data connection interface supports multiple communication protocols, can support function upgrade, program adjustment, etc., and is convenient for data transmission.

[0055] In actual use, the DC gun holder 31 or the AC gun holder 32 of the load detection device is connected with the charging gun of the charging pile to be detected, and the test parameters are set through the display screen 11 and the control button 12 of the control assembly 10; then, the control assembly 10 controls the load switching assembly 30 to switch to the corresponding AC or DC load structure according to the set parameters, and automatically adjusts the number of resistance load units 22 connected to the circuit according to the power demand of the charging pile; during the test, the cooling fan 223 drives the airflow to flow through the cooling air duct 221 and the cooling fins 225, realizing effective cooling of the resistance wire 222, while the temperature sensor monitors the temperature of the resistance wire 222 in real time, ensuring the safety of the equipment; finally, after the test is completed, the control assembly 10 transmits the test data to the external detection equipment or the upper computer through the data connection interface 13 for analysis and processing. The whole test process is highly automated and easy to operate, which can effectively improve the test efficiency and accuracy, and at the same time ensure the safety and stability of the equipment.

[0056] In summary, the present application provides a load detection device, the present application is switched by setting load switching component 30, so that the load switching component 30 switches the alternating current and the alternating current load structure is communicated, and the direct current and the direct current load structure are communicated, and then different current types can be tested respectively; by setting control component 10, load switching component 30 and load component 20 cooperate, realize the integration of alternating current detection and direct current detection function, so that the staff only needs a load detection device to realize the test of different charging piles, and then effectively improve the test efficiency, reduce the operation complexity, test cost and test time; by setting the cooperation of the heat dissipation air pipe 221, the resistance wire 222 and the cooling fan 223, the reliable heat dissipation for the load is realized with a simple structure, the heat dissipation efficiency for the load is improved, and then the problem of interrupting the test due to overheating protection of the load detection device is avoided, the test accuracy is effectively guaranteed and the service life of the device is improved; the present application has simple structure and low cost, is convenient to assemble and maintain, solves the problems of poor compatibility, low test efficiency and low heat dissipation efficiency for the load of the load box in the prior art, and overall, the present application has significant improvement in heat dissipation performance, operation convenience, maintenance simplicity and power bearing capacity, provides a more efficient, reliable and convenient solution for performance test of the automobile charging pile, and is suitable for large-scale popularization and use.

[0057] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0058] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0059] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0060] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "horizontal", "top", "bottom", and the like are generally based on the orientation or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

[0061] For the convenience of description, spatial relative terms such as "above", "upper", "top", "up", and the like can be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "on" the other device or structure will be positioned "below" or "under" the other device or structure. Thus, the exemplary term "above" can include both the "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations) and the spatial relative descriptions used herein will be interpreted accordingly.

[0062] In addition, it should be noted that the use of the terms "first", "second", and the like do not have a special meaning, and are merely used to distinguish the corresponding components, and therefore should not be construed as limiting the scope of protection of the present application.

[0063] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A load detection device, characterized in that, Includes: a control component (10), a load switching component (30), and a load component (20); the load component (20) includes a load housing (21), an AC load structure, and a DC load structure; the load switching component (30) is electrically connected to the control component (10); the charging pile to be tested is connected to the load switching component (30) in a switchable manner; the load switching component (30) is used to switch AC power to the AC load structure and switch DC power to the DC load structure for corresponding testing; the load housing (21) has multiple ventilation holes (211), which are respectively connected to the interior and exterior of the load housing (21); the AC load structure and the DC load structure are respectively connected to the control component (10). 0) Electrical connection; Both the AC load structure and the DC load structure include multiple resistive load units (22), which are spaced apart in the load housing (21); The resistive load unit (22) includes a heat dissipation duct (221), a resistance wire (222), and a cooling fan (223); The resistance wire (222) is used to provide resistive load, and at least a portion of the resistance wire (222) is disposed in the heat dissipation duct (221). The cooling fan (223) is connected to the interior of the heat dissipation duct (221) and at least one of the ventilation holes (211); The cooling fan (223) drives the airflow to flow along the interior of the heat dissipation duct (221) through the resistance wire (222) to perform convective heat dissipation.

2. The load detection device according to claim 1, characterized in that, A portion of the resistor wires (222) in a plurality of resistor load units (22) are connected in series, and a portion of the resistor wires (222) in a plurality of resistor load units (22) are connected in parallel; the resistor load unit (22) further includes: a heat dissipation bracket (224) having a plurality of heat dissipation fins (225); the heat dissipation bracket (224) is disposed inside the heat dissipation duct (221); at least a portion of the resistor wires (222) is wound around the heat dissipation bracket (224) and extends along the axial direction of the heat dissipation bracket (224); the heat dissipation fins (225) protrude from the heat dissipation bracket (224) radially along the heat dissipation duct (221); the cooling fan (223) drives airflow to flow through the heat dissipation fins (225) along the interior of the heat dissipation duct (221) to perform convection cooling.

3. The load detection device according to claim 2, characterized in that, At least a portion of the heat dissipation fins (225) are equidistantly spaced along the axial direction of the heat dissipation bracket (224), and a portion of the resistance wire (222) is wound sequentially between two adjacent heat dissipation fins (225) and is positioned and engaged with the heat dissipation fins (225).

4. The load detection device according to claim 2, characterized in that, The resistive load unit (22) further includes a fixed bracket (226), which is detachably connected to one end of the heat dissipation duct (221) facing the heat dissipation fan (223); the heat dissipation fan (223) is detachably connected to the heat dissipation duct (221); wherein, the end of the heat dissipation bracket (224) near the heat dissipation fan (223) has a limiting piece (227), the fixed bracket (226) has a limiting groove (228), a part of the limiting piece (227) extends into the limiting groove (228) and is limited and engaged with the inner wall of the limiting groove (228).

5. The load detection device according to claim 4, characterized in that, The limiting piece (227) includes a first piece and a second piece, the extension direction of the first piece and the extension direction of the second piece are respectively parallel to the radial direction of the heat dissipation duct (221), and the extension direction of the first piece and the extension direction of the second piece have an angle; the limiting groove (228) includes a first groove and a second groove, the first groove corresponds to and cooperates with the first piece, and the second groove corresponds to and cooperates with the second piece; and / or, the axial direction of the heat dissipation bracket (224) is arranged parallel to the axial direction of the heat dissipation duct (221); the heat dissipation bracket (224) is made of mica material or metal material.

6. The load detection device according to claim 1, characterized in that, The control component (10) includes a display screen (11), control buttons (12), a central controller, and a battery. The display screen (11) is electrically connected to the central controller and is used to display the detection results. The control buttons (12) are electrically connected to the central controller and are used to control the central controller. The battery is connected to the central controller via a circuit and is used to provide power. The central controller is electrically connected to the load switching component (30), the AC load structure, and the DC load structure respectively to control the load switching component (30), the AC load structure, and the DC load structure to work together. The central controller has multiple data connection interfaces (13) for transmitting data. One of the data connection interfaces (13) is used to connect to the charging pile under test to receive the output data of the charging pile under test. The battery has a charging interface (14) for connecting to an external power source to charge the battery.

7. The load detection device according to claim 1, characterized in that, The load switching component (30) includes a DC gun holder (31) and an AC gun holder (32). The DC gun holder (31) is detachably connected to the DC charging gun of the charging pile under test, and the AC gun holder (32) is detachably connected to the AC charging gun of the charging pile under test. The DC gun holder (31) is connected to the DC load structure via a circuit, and the AC gun holder (32) is connected to the AC load structure via a circuit. And / or, the control component (10) matches the number of the resistive load units (22) connected to the circuit as loads according to the power of the charging pile under test.

8. The load detection device according to claim 1, characterized in that, The load components (20) are multiple. A portion of the load components (20) are connected in series to increase the load; and / or, the resistive load unit (22) further includes a temperature sensor electrically connected to the control component (10); the temperature sensor is disposed within the heat dissipation duct (221) and is used to detect the temperature of the resistance wire (222); and / or, the load detection device further includes a voltage detector used to detect the voltage of the load component (20).

9. The load detection device according to claim 1, characterized in that, The load switching component (30) includes a switching circuit and a relay. The relay is disposed on the switching circuit and is used to switch the switching circuit to be connected to the AC load structure or the DC load structure for corresponding testing. And / or, the load switching component (30) includes a protection circuit. The protection circuit is connected to the AC load structure and the DC load structure respectively, and the protection circuit is used to protect the AC load structure or the DC load structure from overload or short circuit.

10. The load detection device according to claim 1, characterized in that, The load detection device further includes a bearing housing (40) and multiple casters (50). The multiple casters (50) are disposed at the bottom of the bearing housing (40) to support the bearing housing (40). The casters (50) have a self-locking function. When the casters (50) are locked, the casters (50) do not rotate to fix the bearing housing (40). The control component (10), the load switching component (30), and the load component (20) are respectively disposed on the bearing housing (40). And / or, the bearing housing (40) is made of galvanized sheet material, and at least a portion of the surface of the bearing housing (40) is powder coated for corrosion protection.

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