Direct-current support capacitor shell explosion-proof test device and method

Abstract

The invention provides a direct-current support capacitor shell explosion-proof test device and method, and belongs to the technical field of power detection. Comprising an adjusting assembly, the main body of the adjusting assembly is a chassis and is in a symmetrical disc shape, the center of the chassis is detachably connected with an air pump, the end of the air pump is provided with a bearing disc, and the top of the bearing disc is provided with a to-be-tested capacitor. By arranging the adjusting assembly and the testing assembly, the device can form a quick disassembly and assembly structure, preset impact points are arranged at multiple angles, impact tests of different degrees are carried out on different positions of a to-be-tested capacitor, and different impact scenes can be simulated by replacing impact heads; the device can be tightly pressed on the top of the test assembly through the gravity of the device when the capacitor to be tested is broken to generate harmful gas and cause internal pressurization, and meanwhile, the harmful gas generated inside is adsorbed through fine water mist and then is circularly filtered through the filter material, so that the possibility of internal residue is reduced, and the safety of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power detection, and in particular to a device and method for testing the explosion resistance of a DC support capacitor housing. Background Art

[0002] DC link capacitors are core components of power electronics systems. By maintaining DC bus voltage stability, they provide filtering and transient current support for applications such as flexible DC transmission, renewable energy generation, and converters. Utilizing metallized polypropylene film and non-inductive winding technology, they offer high-voltage resistance, low equivalent series resistance / inductance, and high capacitance, suppressing voltage fluctuations and protecting devices such as IGBTs.

[0003] The explosion-proof test of DC link capacitor casings is a key technical verification step in ensuring the safe operation of power electronics systems. This test targets internal failures that may occur in capacitors under extreme operating conditions, such as high voltage and high current surges. It simulates scenarios where the casing is subjected to transient high voltage or explosion shocks, verifying its structural strength, material explosion resistance, and sealing reliability.

[0004] Most existing DC support capacitor shell explosion resistance tests use a single track to impact the capacitor under test. After the collision, the angle needs to be adjusted and retested. After the capacitor under test ruptures, the gas generated is harmful to the human body. Usually, during the test, the capacitor under test needs to be enclosed in a sealed environment built with acrylic plates, and the internal harmful gas is discharged to the outside through pipes. However, this method is relatively cumbersome. Each time the capacitor impact point is adjusted, the sealed container needs to be opened, which is inconvenient to operate. The residual gas inside will be directly contacted by personnel, and the acrylic plate that is easy to observe has poor protection capabilities and is difficult to withstand high-voltage environments. Therefore, the present application provides a DC support capacitor shell explosion resistance test device and method to meet the needs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for solving the existing problems.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A DC support capacitor housing explosion-proof test device includes an adjustment component, the main body of the adjustment component is a chassis and is symmetrically disc-shaped, an air pump is detachably connected to the center of the chassis, a carrying plate is provided at the end of the air pump, and a capacitor to be tested is placed on the top of the carrying plate;

[0008] A test assembly is used to surround the capacitor to be tested and perform a shell collision test on the capacitor to be tested under the drive of the carrier plate. There are two sets of test assemblies, which are detachably connected to the two sides of the outside of the adjustment assembly. The contact surfaces of the test assemblies are provided with flexible pads, and the arc plates are detachably connected with side clips;

[0009] The purification component is used to seal the enclosed space of the test component while sealing the internal space and filtering the internal harmful gases harmlessly. The interior of the purification component is divided into three parts: the initial purification bin, the filtration bin and the centralized bin.

[0010] Optionally, a connecting flange is provided at the end of the air pump, a circular rotating head is provided inside the connecting flange, a center groove is provided at the center of the supporting plate, a connecting pipe is provided radiating outward from the center of the center groove, a toothed screw is provided inside the supporting plate, the toothed screw is threadedly connected to a claw plate on the outside, and the claw plate is connected to the inner wall of the supporting plate by a lightweight spring.

[0011] Optionally, the supporting plate and the connecting flange are detachably connected to each other, the circular rotating head is movably connected to the center groove, there are multiple groups of connecting pipes and they are connected to the center groove, and the gear arranged at the end of the toothed screw slightly protrudes from the plane of the supporting plate.

[0012] Optionally, the circular rotating heads are connected to the connecting pipes respectively through rotation.

[0013] Optionally, the test assembly includes an arc plate, a connecting frame, a guide frame and a gas push rod, the guide frame is provided with multiple groups evenly distributed outside the connecting frame, the gas push rod is arranged between the guide frames, the end of the gas push rod is provided with a mounting frame, and the outside of the mounting frame is detachably connected to an impact head.

[0014] Optionally, a connecting tube is provided on the outside of the air push rod, a plug connector is provided at the other end of the connecting tube, a restraining belt is provided on the outside of the plug connector, and the plug connector is detachably connected to the carrying plate.

[0015] Optionally, a ventilation groove is provided on the annular inner wall of the primary purification bin, an atomizing nozzle is provided inside the primary purification bin, the filter bin is filled with filter material, an exhaust fan is provided at the center of the centralized bin and connected to the outside world, and a handle is provided on the top of the purification component.

[0016] Optionally, the number of the ventilation slots and the number of the atomizing nozzles correspond to each other and are evenly distributed inside the primary purification bin, and the primary purification bin, the filtering bin and the concentration bin are connected to each other.

[0017] Optionally, the method includes the following steps: when conducting the test, the arc plate is opened to expand the internal operating space, the capacitor to be tested is placed outside the carrier plate, after the capacitor to be tested contacts the gear portion of the toothed screw, the toothed screw is driven by rotating the capacitor to be tested, and the toothed screw drives the claw plate to retract inward and clamp the capacitor to be tested. After the connection with the capacitor to be tested is completed, the arc plate is closed and folded, and a side card is installed on the outside of the arc plate to complete the locking, and then the charge and discharge test can be carried out. When conducting the overcharge or collision test, the purification component is installed on the outside of the test component for sealing, and the gas is opened. The pump controls the air pressure and controls the rotary head to rotate to connect the air supply to the connecting pipes at the corresponding positions of the air push rods. Under the transmission of the connecting pipes, the air push rods are quickly advanced and the external impact head collides with the capacitor to be tested, thereby completing the collision test at the corresponding position. If the outer shell of the capacitor to be tested is damaged and harmful gas is generated, the internal air pressure increases, the sensor turns on the exhaust fan to drive the airflow, and the harmful gas enters the initial purification bin and the atomizing nozzle is turned on with fine water mist to adsorb the harmful gas, and then it is filtered harmlessly through the filter material and finally discharged through the exhaust fan to complete the test.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] In the above scheme, by setting up adjustment components and test components, the device can form a quick disassembly and assembly structure, and set predetermined impact points at multiple angles to perform impact tests of different degrees on different positions of the capacitor to be tested. The structure is hard-connected to ensure the tightness of the device connection, avoid leakage in the internal space due to structural aging, and different collision scenarios can be simulated by replacing the impact head.

[0020] By setting up a purification component, when the capacitor to be tested ruptures and produces harmful gases, causing internal pressurization, the device can be tightly pressed on the top of the test component by its own gravity, while the harmful gases generated inside are adsorbed by fine water mist and then circulated and filtered through the filter material, reducing the possibility of internal residue and improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable one skilled in the art to make and use the invention.

[0022] Figure 1 Schematic diagram of the overall appearance of the device;

[0023] Figure 2 for Figure 1 The internal structure expansion diagram;

[0024] Figure 3 for Figure 1Exploded diagram of the internal structure;

[0025] Figure 4 A side cross-sectional view of the internal structure of the purification component;

[0026] Figure 5 It is a partial structural diagram of the device;

[0027] Figure 6 It is a partial structural diagram of the regulating component;

[0028] Figure 7 for Figure 6 A magnified view of the structure at point A;

[0029] 1. Adjustment assembly; 101. Chassis; 102. Air pump; 103. Connecting flange; 104. Rotating head; 105. Carrying plate; 106. Connecting pipe; 107. Center slot; 108. Toothed screw; 109. Claw plate; 110. Light spring; 2. Test assembly; 201. Arc plate; 202. Connecting frame; 203. Guide frame; 204. Air push rod; 205. Mounting frame; 206. Impact head; 207. Connecting pipe; 208. Plug connector; 209. Restraint belt; 210. Side clip; 3. Purification assembly; 301. Pre-cleaning chamber; 302. Filter chamber; 303. Centralized chamber; 304. Handle; 305. Ventilation slot; 306. Atomizing nozzle; 307. Filter material; 308. Exhaust fan; 4. Capacitor to be tested.

[0030] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0031] The following describes in detail, with reference to the accompanying drawings and specific embodiments, a device and method for testing the explosion resistance of a DC link capacitor housing provided by the present invention. It is also noted that, for the sake of completeness, the following embodiments are optimal and preferred embodiments, and those skilled in the art may employ alternative implementations for known techniques. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0032] It should be noted that references in the specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes such specific features, structures, or characteristics. In addition, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0033] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0034] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0035] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0036] like Figures 1 to 7 As shown, the embodiment of the present invention provides a device and method for testing the explosion resistance of a DC support capacitor housing, including an adjustment component 1. The main body of the adjustment component 1 is a chassis 101 and is symmetrically disc-shaped. An air pump 102 is detachably connected to the center of the chassis 101. A carrying plate 105 is provided at the end of the air pump 102. A capacitor 4 to be tested is placed on the top of the carrying plate 105.

[0037] The test assembly 2 is used to surround the capacitor 4 to be tested and perform a shell collision test on the capacitor 4 under the drive of the carrier plate 105. There are two sets of test assemblies 2 and they are detachably connected to the two sides of the outside of the adjustment assembly 1. The contact surfaces of the test assemblies 2 are provided with flexible pads, and the arc plates 201 are detachably connected with side clips 210;

[0038] The purification component 3 is used to seal the enclosed space of the test component 2 while sealing the internal space and filtering the internal harmful gases harmlessly. The interior of the purification component 3 is divided into three parts: the initial purification chamber 301, the filtering chamber 302 and the centralized chamber 303.

[0039] When testing, the arc plate 201 is opened to expand the internal operating space, and the capacitor 4 to be tested is placed outside the carrier plate 105. After the capacitor 4 to be tested contacts the gear portion of the toothed screw 108, the toothed screw 108 is driven by rotating the capacitor 4 to be tested, and the toothed screw 108 drives the claw plate 109 to retract inward and clamp the capacitor 4 to be tested. After the connection with the capacitor 4 to be tested is completed, the arc plate 201 is closed and the side card 210 is installed on the outside of the arc plate 201 to complete the locking. Then the charge and discharge test can be carried out. When performing a collision test, the purification component 3 is installed on the outside of the test component 2 and sealed, the air pump 102 is turned on to control the air pressure, and the circular rotary head 104 is controlled to rotate to connect the connecting pipes 106 at the corresponding positions of the air push rod 204 to supply air. Under the transportation of the connecting pipe 207, the air push rod 204 is quickly advanced and the external impact head 206 is quickly collided with the capacitor 4 to be tested along the guide frame 203. The height of the end of the air pump 102 can be manually adjusted to adjust the position of the corresponding device to complete the collision test.

[0040] In this embodiment, if Figures 1 to 7 It is shown that when conducting an overcharge test, after the purification component 3 is installed on the outside of the test component 2 and sealed, if the outer shell of the capacitor 4 to be tested is damaged and harmful gas is generated, the air pressure inside the test component 2 increases, and the sensor detects the pressure increase and turns on the exhaust fan 308 to drive the internal gas flow. The harmful gas flows into the primary purification bin 301 through the ventilation slot 305. After the harmful gas enters the primary purification bin 301, the atomizing nozzle 306 is turned on to spray fine water mist to adsorb the harmful gas. The floating harmful substances in the gas are adsorbed by the water mist and carried to the inside of the filter bin 302, and then the water mist is adsorbed by the filter material 307 for harmless filtration treatment. Finally, the internal gas is discharged through the exhaust fan 308, thereby completing the overcharge test.

[0041] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A DC support capacitor shell explosion-proof test device, characterized in that: The invention comprises an adjustment component (1), wherein the main body of the adjustment component (1) is a chassis (101) and is symmetrically disc-shaped, an air pump (102) is detachably connected to the center of the chassis (101), a carrying plate (105) is provided at the end of the air pump (102), and a capacitor (4) to be measured is placed on the top of the carrying plate (105); A test assembly (2), the test assembly (2) is used to surround the capacitor to be tested (4) and perform a shell collision test on the capacitor to be tested (4) under the drive of the carrier plate (105), the test assembly (2) has two groups and is detachably connected to the two sides of the outside of the adjustment assembly (1), the contact surfaces of the test assemblies (2) are provided with flexible pads, and the arc plates (201) are detachably connected with side cards (210); The purification component (3) is used to seal the enclosed space of the test component (2) while sealing the internal space and filtering the internal harmful gases harmlessly. The purification component (3) is internally divided into three parts: a primary purification chamber (301), a filtering chamber (302) and a centralized chamber (303).

2. A DC link capacitor shell explosion-proof test device according to claim 1, characterized in that: The air pump (102) is provided with a connecting flange (103) at the end thereof, a circular rotating head (104) is provided inside the connecting flange (103), a central groove (107) is provided at the center of the inner portion of the carrier plate (105), a connecting pipe (106) is provided radiating outward from the center of the central groove (107), a toothed screw (108) is provided inside the carrier plate (105), the toothed screw (108) is externally threadedly connected to a claw plate (109), and a light spring (110) is connected to the inner wall of the carrier plate (105).

3. The explosion-proof test device for a DC link capacitor housing according to claim 2, characterized in that: The carrier plate (105) and the connecting flange (103) are detachably connected to each other, the circular rotating head (104) is movably connected to the central groove (107), the connecting tubes (106) are provided in multiple groups and are connected to the central groove (107), and the gear provided at the end of the toothed screw (108) slightly protrudes from the plane of the carrier plate (105).

4. A DC link capacitor shell explosion-proof test device according to claim 3, characterized in that: The circular rotating heads (104) are connected to the connecting pipes (106) through rotation.

5. The explosion-proof test device for a DC link capacitor housing according to claim 1, characterized in that: The test assembly (2) comprises an arc plate (201), a connecting frame (202), a guide frame (203) and a gas push rod (204); the guide frame (203) is provided with a plurality of groups evenly distributed outside the connecting frame (202); the gas push rod (204) is arranged between the guide frames (203); a mounting frame (205) is provided at the end of the gas push rod (204); and an impact head (206) is detachably connected to the outside of the mounting frame (205).

6. The explosion-proof test device for a DC link capacitor housing according to claim 5, characterized in that: The air push rod (204) is provided with a connecting pipe (207) on the outside, and a plug connector (208) is provided on the other end of the connecting pipe (207). A restraining belt (209) is provided on the outside of the plug connector (208). The plug connector (208) is detachably connected to the carrier plate (105).

7. The explosion-proof test device for a DC link capacitor housing according to claim 1, characterized in that: The annular inner wall of the primary purification chamber (301) is provided with a ventilation slot (305), an atomizing nozzle (306) is provided inside the primary purification chamber (301), the filter chamber (302) is filled with filter material (307), an exhaust fan (308) is provided at the center of the centralized chamber (303) and is connected to the outside world, and a handle (304) is provided on the top of the purification component (3).

8. The explosion-proof test device for a DC link capacitor housing according to claim 7, characterized in that: The ventilation slots (305) and the atomizing nozzles (306) correspond in number to each other and are evenly distributed inside the primary purification bin (301). The primary purification bin (301), the filtering bin (302) and the concentration bin (303) are connected to each other.

9. A DC link capacitor shell explosion-proof test process according to claims 1-8, characterized in that: The method comprises the following steps: when performing a test, opening an arc plate (201) to expand an internal operating space, placing a capacitor to be tested (4) outside a carrier plate (105), after the capacitor to be tested (4) contacts the gear portion of a toothed screw (108), rotating the capacitor to be tested (4) to drive the toothed screw (108), and the toothed screw (108) drives the claw plate (109) to contract inward and clamp the capacitor to be tested (4), after completing the connection with the capacitor to be tested (4), closing the arc plate (201) to fold it up and installing a side clip (210) outside the arc plate (201) to complete the locking, and then performing a charge and discharge test; when performing an overcharge or collision test, installing a purification component (3) outside a test component (2) to seal it, and starting an air pump ( 102) performs air pressure control, controls the circular rotating head (104) to rotate and connects the connecting pipe (106) at the corresponding position of the air push rod (204) to the air supply. Under the transportation of the connecting pipe (207), the air push rod (204) is quickly advanced and the external impact head (206) collides with the capacitor to be tested (4), thereby completing the collision test at the corresponding position. If the shell of the capacitor to be tested (4) is damaged and harmful gas is generated, the internal air pressure increases, the sensor turns on the exhaust fan (308) to drive the air flow, and the harmful gas enters the initial clean room (301) and then turns on the atomizing nozzle (306) to absorb the fine water mist of the harmful gas, and then passes through the filter material (307) for harmless filtration treatment, and finally is discharged through the exhaust fan (308), thereby completing the test.

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