Testing device for distributed photovoltaic inverter

Abstract

The utility model aims to provide a testing device for a distributed photovoltaic inverter, which comprises a base and a clamping platform, and is characterized in that the clamping platform comprises a platform part and a clamping part used for fixing the distributed photovoltaic inverter on the platform part; the testing device further comprises a vibration mechanism which is connected between the base and the clamping platform and provides a vibration source for vibration of the clamping platform, and the vibration mechanism comprises a transmission part with one end rotationally connected with the bottom of the clamping platform. The vibration mechanism further comprises a driving part which is fixedly connected to the base and used for driving the other end of the transmission part to do circular motion on the plane perpendicular to the base. The testing device further comprises a supporting mechanism which is connected between the base and the clamping platform and provides telescopic support for the clamping platform when the clamping platform vibrates. The vibration mechanism converts an axial force provided by the driving part into a linear force to the clamping platform, so that the clamping platform performs periodic reciprocating motion, thereby creating a test condition for testing the stability of the distributed photovoltaic inverter in a vibration environment.

Description

Technical Field

[0001] The utility model relates to the technical field of instrument testing, and more specifically, to the technical field of a testing device for distributed photovoltaic inverters. Background Art

[0002] Distributed photovoltaic inverters convert DC power into AC power through electronic devices (such as MOSFETs and IGBTs). This AC power is filtered through a filter circuit before being output from the AC output terminal. This process enables the conversion and utilization of photovoltaic power. Factory testing of photovoltaic inverters requires the use of appropriate testing equipment.

[0003] However, existing testing equipment focuses solely on the inverter's electrical performance, neglecting environmental adaptability testing. In practical applications, distributed photovoltaic inverters are often installed outdoors, where strong winds, rain, and snow can cause them to vibrate to a certain degree. Therefore, testing the stability of distributed photovoltaic inverters in vibrating environments is crucial for evaluating their performance. Utility Model Content

[0004] The utility model aims to provide a testing device for distributed photovoltaic inverters, which solves the problem in the prior art that the testing tooling cannot effectively test the stability of distributed photovoltaic inverters under vibration environments.

[0005] The utility model is achieved through the following technical solutions:

[0006] A testing device for a distributed photovoltaic inverter comprises a base and a clamping platform, wherein the clamping platform comprises a platform portion and a clamping portion for fixing the distributed photovoltaic inverter to the platform portion;

[0007] The testing device further includes a vibration mechanism connected between the base and the clamping platform to provide a vibration source for the clamping platform, the vibration mechanism including a transmission portion having one end rotatably connected to the bottom of the clamping platform, and a driving portion fixedly connected to the base for driving the other end of the transmission portion to perform circular motion in a plane perpendicular to the base;

[0008] The testing device further includes a support mechanism connected between the base and the clamping platform for providing telescopic support to the clamping platform when the clamping platform vibrates.

[0009] As a preferred embodiment of the present invention, the driving part includes a driving motor and a rotating disk, the driving motor includes a motor body and an output shaft, the motor body is fixedly connected to the upper end surface of the base, the output shaft is parallel to the base, and the rotating disk is perpendicular to the output shaft and fixedly connected to the output shaft;

[0010] The transmission part is rotatably connected to the rotating disk, and the rotation direction of the transmission part is consistent with the rotation direction of the rotating disk.

[0011] As a preferred embodiment of the present invention, the rotating disk is provided with a rotating column having the same axial direction as the output shaft, and an adjustment structure for adjusting the distance between the rotating column and the output shaft, and the transmission part is rotatably connected to the rotating column.

[0012] As a preferred embodiment of the present invention, the output shaft is fixedly connected to the center of the rotating disk;

[0013] The adjusting structure includes a guide groove radially opened on the end face of the rotating disk away from the motor body, a connecting screw penetrating into the guide groove from the arc surface of the rotating disk, and a limiting structure for limiting the sliding of the connecting screw along the guide groove. An end of the connecting screw close to the center of the rotating disk is arranged in a gap with the rotating disk, and an end of the connecting screw away from the center of the rotating disk extends outward of the arc surface of the rotating disk. The rotating column is threadedly connected to the part of the connecting screw located in the guide groove.

[0014] As a preferred embodiment of the present invention, the platform portion includes a main structure and a threaded rod. An inner cavity is defined within the main structure. The threaded rod penetrates the inner cavity from a side surface of the main structure and is connected to a bearing fixedly disposed in the inner cavity. The other end of the threaded rod extends out of the outer side of the main structure.

[0015] The clamping part includes a first clamping plate and a second clamping plate arranged opposite to each other, the first clamping plate is fixedly connected to the upper end surface of the main structure, the threaded rod passes through the second clamping plate and is threadedly engaged with the second clamping plate, and the upper end surface of the main structure is provided with a slideway along the length direction of the threaded rod, which is connected to the inner cavity and allows the second clamping plate to move.

[0016] As a preferred embodiment of the present invention, the platform portion includes a main body structure, a first threaded rod and a second threaded rod, a first inner cavity and a second inner cavity are symmetrically opened inside the main body structure, the first threaded rod penetrates the first inner cavity from the side of the main body structure and is connected to a bearing fixedly arranged in the first inner cavity, the second threaded rod penetrates the second inner cavity from the side of the main body structure opposite to the first threaded rod and is connected to a bearing fixedly arranged in the second inner cavity, the first threaded rod and the second threaded rod are coaxially arranged, and the other ends of the first threaded rod and the second threaded rod extend outside the main body structure;

[0017] The clamping part includes a third clamping plate and a fourth clamping plate arranged opposite to each other, the first threaded rod passes through the third clamping plate and is threadedly engaged with the third clamping plate, the second threaded rod passes through the fourth clamping plate and is threadedly engaged with the fourth clamping plate, and the upper end surface of the main structure is provided with a first slideway connected to the first inner cavity and for the movement of the third clamping plate and a second slideway connected to the second inner cavity and for the movement of the fourth clamping plate along the length direction of the first threaded rod and the second threaded rod.

[0018] As a preferred embodiment of the present invention, rubber gaskets are provided on opposite sides of the third clamping plate and the fourth clamping plate.

[0019] As a preferred embodiment of the present invention, the support mechanism includes a support sleeve rod and a guide rod slidably connected to the support sleeve rod, the bottom end of the support sleeve rod is fixedly connected to the upper end surface of the base, and the top end of the guide rod is fixedly connected to the lower end surface of the platform part, and when the clamping platform vibrates, the guide rod slides downward along the length direction of the support sleeve rod.

[0020] As a preferred embodiment of the present invention, the support mechanism further includes a reset spring sleeved outside the support sleeve rod, and two ends of the reset spring are fixedly connected to the upper end surface of the base and the lower end surface of the platform portion respectively.

[0021] As a preferred embodiment of the present invention, a plurality of evenly arranged support mechanisms are arranged around the vibration mechanism.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. The vibration mechanism converts the axial force provided by the drive unit into a linear force on the clamping platform. Under the external force applied by the transmission unit, the clamping platform performs periodic reciprocating motion along the extension and contraction direction of the telescopic support mechanism. This periodic reciprocating motion simulates a vibration environment. The distributed photovoltaic inverter is fixed to the platform by the clamping unit, allowing the distributed photovoltaic inverter to vibrate along with the clamping platform, thus creating test conditions for the stability of the distributed photovoltaic inverter in a vibration environment.

[0024] 2. The output shaft is fixedly connected to the center of the rotating disk, reducing the space required for the rotating disk to rotate and making the vibration mechanism more compact. Furthermore, the guide groove is radially extending along the rotating disk. The distance the rotating column moves in the guide groove is equal to the distance between the rotating column and the output shaft, facilitating quantitative adjustment of the vibration amplitude of the clamping platform.

[0025] 3. The third and fourth clamping plates can be adjusted to accommodate various types and sizes of distributed photovoltaic inverters. The distributed photovoltaic inverters can always be fixed in the middle of the platform as much as possible, which is more conducive to the overall balance and stability of the test device during testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of this specification, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of a test device for a distributed photovoltaic inverter provided in an embodiment of this specification, illustrating a method for fixing the distributed photovoltaic inverter on the test device;

[0028] Figure 2 This is a schematic diagram of a vibration mechanism in a test device for a distributed photovoltaic inverter provided in an embodiment of this specification;

[0029] Figure 3 This is a partial schematic diagram of a vibration mechanism in a test device for a distributed photovoltaic inverter provided in an embodiment of this specification, illustrating a specific arrangement of the adjustment structure;

[0030] Figure 4 This is a cross-sectional view of a clamping platform in a test device for a distributed photovoltaic inverter provided in an embodiment of this specification, showing the specific arrangement of the platform portion and the clamping portion (the bearing in the inner cavity is not shown);

[0031] Figure 5 This is a cross-sectional view of a clamping platform in a test device for a distributed photovoltaic inverter provided in an embodiment of this specification, showing the specific arrangement of the platform portion and the clamping portion (the bearings in the first inner cavity and the second inner cavity are not shown);

[0032] Figure 6 This is a front view of a testing device for a distributed photovoltaic inverter provided in an embodiment of this specification, showing the specific arrangement of the support mechanism.

[0033] In the figure: 1, base; 2, clamping platform; 21, platform portion; 211, main structure; 2111, inner cavity; 2112, slide; 2113, first inner cavity; 2114, second inner cavity; 2115, first slide; 2116, second slide; 212, threaded rod; 213, first threaded rod; 214, second threaded rod; 22, clamping portion; 221, first clamping plate; 222, second clamping plate; 223, third clamping plate; 22 4. Fourth splint; 225. Rubber gasket; 3. Vibration mechanism; 31. Transmission unit; 32. Drive unit; 33. Bracket; 321. Drive motor; 322. Rotating disk; 3221. Rotating column; 3222. Adjustment structure; 32221. Guide groove; 32222. Connecting screw; 32223. Limiting structure; 4. Support mechanism; 41. Support sleeve rod; 42. Guide rod; 43. Reset spring; 5. Distributed photovoltaic inverter. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below with reference to the accompanying drawings.

[0035] The terms "first," "second," "third," etc. in the description and claims of this specification and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0036] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

[0037] like Figure 1 As shown, a test device for a distributed photovoltaic inverter includes a base 1 and a clamping platform 2, wherein the clamping platform 2 includes a platform portion 21 and a clamping portion 22 for fixing the distributed photovoltaic inverter 5 on the platform portion 21;

[0038] The testing device also includes a vibration mechanism 3 connected between the base 1 and the clamping platform 2 to provide a vibration source for the clamping platform 2. The vibration mechanism 3 includes a transmission portion 31 having one end rotatably connected to the bottom of the clamping platform 2. The vibration mechanism 3 also includes a drive portion 32 fixedly connected to the base 1 for driving the other end of the transmission portion 31 to perform circular motion in a plane perpendicular to the base 1.

[0039] The testing device further includes a support mechanism 4 connected between the base 1 and the clamping platform 2 for providing telescopic support to the clamping platform 2 when the clamping platform 2 vibrates.

[0040] Explanatory note: base 1 serves as the base of the test device, and drive unit 32 is fixedly connected to base 1. One end of drive transmission unit 31 is driven to perform circular motion in a plane perpendicular to base 1, while the other end of transmission unit 31 is rotatably connected to the bottom of clamping platform 2. Thus, transmission unit 31 applies a periodically changing external force to clamping platform 2, and one complete cycle of external force change corresponds to one complete circular motion of one end of transmission unit 31. Under the external force applied by transmission unit 31, clamping platform 2 performs periodic reciprocating motion along the extension and contraction direction of telescopic support mechanism 4. This periodic reciprocating motion simulates a vibration environment, and one complete cycle of the reciprocating motion of clamping platform 2 corresponds to one complete cycle of external force change.

[0041] It is easy to understand that the smaller the reciprocating motion period, the greater the vibration frequency. The vibration frequency of the mounting platform 2 can be adjusted by setting the output power of the drive unit 32. The distributed photovoltaic inverter 5 is fixed to the platform 21 via the clamping portion 22, allowing the distributed photovoltaic inverter 5 to vibrate along with the mounting platform 2. This creates test conditions for testing the stability of the distributed photovoltaic inverter 5 in a vibrating environment.

[0042] In some embodiments, as Figure 2 As shown, the driving part 32 includes a driving motor 321 and a rotating disk 322. The driving motor 321 includes a motor body and an output shaft. The motor body is fixedly connected to the upper end surface of the base 1. The output shaft is parallel to the base 1. The rotating disk 322 is perpendicular to the output shaft and fixedly connected to the output shaft.

[0043] The transmission part 31 is rotatably connected to the rotating disk 322 , and the rotation direction of the transmission part 31 is consistent with the rotation direction of the rotating disk 322 .

[0044] For illustrative purposes, the output shaft of the drive motor 321 is parallel to the base 1, and the rotating disk 322 is perpendicular to and fixedly connected to the output shaft. Thus, when the drive motor 321 is activated, the rotating disk 322 rotates along with the output shaft of the drive motor 321, with the connection point as the center. The transmission unit 31 is rotationally connected to the rotating disk 322, and the rotation direction is consistent with the rotation direction of the rotating disk 322, thereby achieving circular motion in a plane perpendicular to the base 1. The distance between the rotational connection point of the transmission unit 31 and the rotating disk 322 and the fixed connection point of the output shaft and the rotating disk 322 determines the vibration amplitude of the clamping platform 2.

[0045] Illustrative, Figure 2A bracket 33 is also provided, fixedly connected between the motor body and the base 1, to increase the distance between the drive motor 321 and the upper end surface of the base 1, thereby creating space for the rotation of the rotating disk 322. The L-shaped bracket 33 is the preferred embodiment. The horizontal portion of the L-shaped structure increases the contact area with the base 1, and the vertical portion of the L-shaped structure can be provided with a through hole that matches the fixed motor body, thereby more firmly fixing the drive motor 321 to the base 1.

[0046] In some embodiments, the rotating disk 322 is provided with a rotating column 3221 having the same axis as the output shaft, and an adjusting structure 3222 for adjusting the distance between the rotating column 3221 and the output shaft, and the transmission part 31 is rotatably connected to the rotating column 3221 .

[0047] For illustrative purposes, the transmission unit 31 is rotatably connected to the rotating column 3221. Moving the rotating column 3221 via the adjustment structure 3222 effectively changes the rotational connection point between the transmission unit 31 and the rotating disk 322, thereby adjusting the vibration amplitude of the clamping platform 2. For example, assuming the length of the transmission unit 31 is L, the distance between the rotating column 3221 and the fixed connection point between the output shaft and the rotating disk 322 is D, and based on the horizontal plane at the fixed connection point between the output shaft and the rotating disk 322, the maximum lifting height of the clamping platform 2 = L + D, and the maximum falling height of the clamping platform 2 = LD, then the vibration amplitude of the clamping platform 2 = (L + D) - (LD) = 2D.

[0048] In some embodiments, as Figure 3 As shown, the output shaft is fixedly connected to the center of the rotating disk 322; the adjusting structure 3222 includes a guide groove 32221 radially opened on the end face of the rotating disk 322 away from the motor body along the rotating disk 322, a connecting screw 32222 penetrating into the guide groove 32221 from the arc surface of the rotating disk 322, and a limiting structure 32223 for limiting the sliding of the connecting screw 32222 along the guide groove 32221. The end of the connecting screw 32222 close to the center of the rotating disk 322 is arranged in a gap with the rotating disk 322, and the end of the connecting screw 32222 away from the center of the rotating disk 322 extends out of the outer side of the arc surface of the rotating disk 322, and the rotating column 3221 is threadedly connected to the part of the connecting screw 32222 located in the guide groove 32221.

[0049] For illustrative purposes, the fixed connection point between the output shaft and the rotating disk 322 is at the center of the rotating disk 322, thereby reducing the space required for the rotating disk 322 to rotate and making the structure of the vibration mechanism 3 more compact. Furthermore, the guide slot 32221 is radially extending along the rotating disk 322. Therefore, the length of movement of the rotating post 3221 within the guide slot 32221 is equal to the length of the distance between the rotating post 3221 and the output shaft, thereby facilitating quantitative adjustment of the vibration amplitude of the clamping platform 2. Graduations can also be marked on the rotating disk 322 along the length of the guide slot 32221, making the current vibration amplitude more intuitive and easy to read.

[0050] For illustrative purposes, the end of the connecting screw 32222 near the center of the rotating disk 322 is spaced apart from the rotating disk 322. Specifically, the rotating disk 322 defines a recessed hole with a diameter slightly larger than the diameter of the connecting screw 32222 at the end of the connecting screw 32222 near the center of the rotating disk 322. After the connecting screw 32222 is installed, the end near the center of the rotating disk 3222 is located within the recessed hole, with a gap between it and the inner wall of the recessed hole. A limiting structure 32223 is also provided at the other end of the connecting screw 32222 to prevent the connecting screw 32222 from moving along the length of the guide slot 32221. Therefore, under the constraints of the recessed hole and the limiting structure 32223, the connecting screw 32222 is prevented from falling out of the guide slot 32221. Because the rotating column 3221 is threadedly connected to the connecting screw 32222 located in the guide groove 32221, the rotating column 3221 can move relative to the connecting screw 32222 in the guide groove 32221 by rotating the connecting screw 32222 to extend the part outside the arc surface of the rotating disk 322. Since the connecting screw 32222 cannot move along the length direction of the guide groove 32221, when the connecting screw 32222 rotates, the rotating column 3221 will move along the connecting screw 32222.

[0051] Among them, the purpose of setting the limiting structure 32223 is to limit the movement of the connecting screw 32222 along the length direction of the guide groove 32221. There are many ways to achieve this function in the prior art. The specific structure of the limiting structure 32223 is not shown in the figure. For example, a bearing is sleeved on the connecting screw 32222, and the bearing is fixedly connected to a position of the guide groove 32221 on the rotating disk 322 away from the center of the rotating disk 322; for another example, a key protruding radially along the connecting screw 32222 is provided at the end of the connecting screw 32222 extending out of the arc surface of the rotating disk 322, and a sealing cover that can cover the key but not affect the rotation of the connecting screw 32222 is fixed on the outer side of the arc surface of the rotating disk 322, and the sealing cover has a hole for the connecting screw 32222 to pass through. After installation, the part of the end of the connecting screw 32222 extending from the hole to the outside of the sealing cover serves as a rotating gripping part, and the key rotates in the sealing cover with the connecting screw 32222, but because the key is constrained by the sealing cover, the connecting screw 32222 cannot move along the length direction of the guide groove 32221.

[0052] In some embodiments, the Figure 4 The platform portion 21 includes a main structure 211 and a threaded rod 212. The main structure 211 defines an inner cavity 2111. The threaded rod 212 penetrates the inner cavity 2111 from the side of the main structure 211 and is connected to a bearing fixed in the inner cavity 2111. The other end of the threaded rod 212 extends out of the outer side of the main structure 211.

[0053] The clamping portion 22 includes a first clamping plate 221 and a second clamping plate 222 arranged opposite to each other. The first clamping plate 221 is fixedly connected to the upper end surface of the main structure 211. The threaded rod 212 passes through the second clamping plate 222 and is threadedly engaged with the second clamping plate 222. The upper end surface of the main structure 211 is provided with a slide 2112 along the length direction of the threaded rod 212, which connects to the inner cavity 2111 and allows the second clamping plate 222 to move.

[0054] For example, the bearing in the inner cavity 2111 can be fixedly set at a position on the main structure 211 that contacts the threaded rod 212, such as being set at the opening created by the threaded rod 212 penetrating the side of the main structure 211; or being set at the inner wall near the end of the threaded rod 212 entering the inner cavity 2111; or bearings can be set at both of the aforementioned positions. The bearing serves to provide the threaded rod 212 with the ability to rotate relative to the main structure 211 and at the same time limit the threaded rod 212 from moving in the inner cavity 2111 along the length direction. Therefore, when the threaded rod 212 is manually rotated, the part of the second clamping plate 222 in the inner cavity 2111 is threadedly engaged with the threaded rod 212, so that the second clamping plate 222 moves along the threaded rod 212 as the threaded rod 212 rotates. The part of the second clamping plate 222 outside the inner cavity 2111 moves back and forth along the slide 2112 relative to the first clamping plate 221 fixedly connected to the upper end face of the main structure 211. The two clamping plates cooperate with each other to adjust the clamping spacing, thereby meeting the clamping and fixation of distributed photovoltaic inverters 5 of various models and sizes.

[0055] In other embodiments, Figure 5 The platform portion 21 includes a main body structure 211, a first threaded rod 213 and a second threaded rod 214. The main body structure 211 has a first inner cavity 2113 and a second inner cavity 2114 symmetrically formed therein. The first threaded rod 213 penetrates the first inner cavity 2113 from the side of the main body structure 211 and is connected to a bearing fixedly disposed in the first inner cavity 2113. The second threaded rod 214 penetrates the second inner cavity 2114 from the side of the main body structure 211 opposite to the first threaded rod 213 and is connected to a bearing fixedly disposed in the second inner cavity 2114. The first threaded rod 213 and the second threaded rod 214 are coaxially disposed, and the other ends of the first threaded rod 213 and the second threaded rod 214 extend out of the main body structure 211.

[0056] The clamping portion 22 includes a third clamping plate 223 and a fourth clamping plate 224 arranged opposite to each other, the first threaded rod 213 passes through the third clamping plate 223 and is threadedly engaged with the third clamping plate 223, the second threaded rod 214 passes through the fourth clamping plate 224 and is threadedly engaged with the fourth clamping plate 224, and the upper end surface of the main structure 211 is provided with a first slide 2115 connected to the first inner cavity 2113 and for the movement of the third clamping plate 223 and a second slide 2116 connected to the second inner cavity 2114 and for the movement of the fourth clamping plate 224 along the length direction of the first threaded rod 213 and the second threaded rod 214.

[0057] For illustrative purposes, this embodiment differs from the previous embodiment in that, whereas in the previous embodiment, one of the two clamps was fixed and the other was adjustable, both clamps in this embodiment are independently adjustable. The remaining technical details and principles are essentially the same and will not be further elaborated upon here. Thus, by adjusting the positions of the third clamp 223 and the fourth clamp 224, the distributed photovoltaic inverter 5 can be fixed in the center of the platform portion 21, further facilitating overall balance and stability during testing of the test device.

[0058] In various embodiments, rubber gaskets 225 are provided on the opposing sides of the first and second clamping plates 221, 222, and on the opposing sides of the third and fourth clamping plates 223, 224. These rubber gaskets 225 increase the friction between the clamping plates and the housing of the distributed photovoltaic inverter 5 and prevent the clamping plates from abrading the outer surface of the distributed photovoltaic inverter 5. The connecting screw 32222, the threaded rod 212, the first threaded rod 213, and the second threaded rod 214 are all provided with handles for easy rotation.

[0059] In some embodiments, the Figure 6 The support mechanism 4 includes a support sleeve rod 41 and a guide rod 42 slidably connected to the support sleeve rod 41. The bottom end of the support sleeve rod 41 is fixedly connected to the upper end surface of the base 1, and the top end of the guide rod 42 is fixedly connected to the lower end surface of the platform part 21. When the clamping platform 2 vibrates, the guide rod 42 slides downward along the length direction of the support sleeve rod 41.

[0060] For illustrative purposes, when the test device is not in operation, the support sleeve 41 and guide rod 42 primarily support the clamping platform 2. When the test device is in operation, the support sleeve 41 and guide rod 42 also guide the vibration direction of the clamping platform 2. The telescopic length of the support sleeve 41 and guide rod 42 must be greater than twice the distance between the fixed connection point between the rotating disk 322 and the output shaft and the farthest end of the guide slot 32221 to meet the movement requirements of the clamping platform 2 at maximum amplitude.

[0061] In other embodiments, the support mechanism 4 further includes a return spring 43 sleeved outside the support sleeve rod 41 , and both ends of the return spring 43 are fixedly connected to the upper end surface of the base 1 and the lower end surface of the platform portion 21 respectively.

[0062] Explanatory note: the purpose of providing the return spring 43 is to provide a certain buffering effect on the external force applied by the transmission rod to the platform portion 21. In order to enhance the buffering effect of the return spring 43 on the clamping platform 2 and reduce the obstruction effect caused by the vibration of the clamping platform 2, when the test device is not in operation, the tendency force provided by the return spring 43 preferably stabilizes the platform portion 21 at a horizontal position corresponding to the length of the transmission portion 31 above the fixed connection point between the rotating disk 322 and the output shaft, that is, the platform portion 21 is stabilized at a horizontal height corresponding to the median value of the amplitude during vibration. This is the preferred solution. At this time, the obstruction effect of the return spring 43 on the clamping platform 2 during vibration is minimized, while also making the external force applied by the transmission rod to the platform portion 21 more uniform, thereby reducing the burden on the drive motor 321.

[0063] For example, assuming that the length of the transmission part 31 is L, the distance between the rotating column 3221 and the fixed connection point between the output shaft and the rotating disk 322 is D, and taking the plane where the fixed connection point between the output shaft and the rotating disk 322 is located as a reference, the maximum lifting height of the clamping platform 2 = L+D, the maximum falling height of the clamping platform 2 = LD, then when the test device is not running, the reset spring 43 stabilizes the platform part 21 at the preferred height = (L+D+LD) / 2=L.

[0064] In various embodiments, the vibration mechanism 3 is surrounded by a plurality of evenly arranged support mechanisms 4 .

[0065] For example, the testing devices in multiple embodiments are illustrated by taking four supporting mechanisms 4 as an example.

[0066] Implementation principle: Place the distributed photovoltaic inverter 5 on the platform 21. Adjust the positions of the third clamping plate 223 and the fourth clamping plate 224 by rotating the first threaded rod 213 and the second threaded rod 214, respectively, to clamp the distributed photovoltaic inverter 5 in the middle of the platform 21. Start the drive motor 321 to output a driving force to drive the rotating disk 322 to rotate around the drive shaft. At the same time, the rotating disk 322 drives one end of the transmission part 31 to rotate around the rotating column 3221. The platform 21 is subjected to a force along the length of the transmission part 31 from the other end. Supported and guided by the support mechanism 4, the platform 21 exhibits periodic motion in the vertical direction, i.e., vibration. One rotation of the rotating disk 322 corresponds to one vibration cycle of the platform 21. This provides a vibration test environment for the distributed photovoltaic inverter 5 and tests the vibration stability of the distributed photovoltaic inverter 5.

[0067] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A test device for distributed photovoltaic inverters, characterized by: It comprises a base (1) and a clamping platform (2), wherein the clamping platform (2) comprises a platform portion (21) and a clamping portion (22) for fixing a distributed photovoltaic inverter (5) to the platform portion (21); The testing device further comprises a vibration mechanism (3) connected between the base (1) and the clamping platform (2) for providing a vibration source for the clamping platform (2) to vibrate, the vibration mechanism (3) comprising a transmission part (31) having one end rotatably connected to the bottom of the clamping platform (2), and the vibration mechanism (3) further comprising a driving part (32) fixedly connected to the base (1) for driving the other end of the transmission part (31) to perform a circular motion on a plane perpendicular to the base (1); The testing device further comprises a support mechanism (4) connected between the base (1) and the clamping platform (2) for providing telescopic support to the clamping platform (2) when the clamping platform (2) vibrates.

2. A testing device for distributed photovoltaic inverters according to claim 1, characterized in that: The driving portion (32) includes a driving motor (321) and a rotating disk (322), the driving motor (321) includes a motor body and an output shaft, the motor body is fixedly connected to the upper end surface of the base (1), the output shaft and the base (1) remain parallel, and the rotating disk (322) is perpendicular to the output shaft and fixedly connected to the output shaft; The transmission part (31) is rotatably connected to the rotating disk (322), and the rotation direction of the transmission part (31) is consistent with the rotation direction of the rotating disk (322).

3. The test device for distributed photovoltaic inverters according to claim 2, characterized in that: The rotating disk (322) is provided with a rotating column (3221) having the same axial direction as the output shaft, and an adjusting structure (3222) for adjusting the distance between the rotating column (3221) and the output shaft. The transmission part (31) is rotatably connected to the rotating column (3221).

4. A test device for distributed photovoltaic inverters according to claim 3, characterized in that: The output shaft is fixedly connected to the center of the rotating disk (322); The adjustment structure (3222) comprises a guide groove (32221) radially opened on an end face of the rotating disk (322) away from the motor body, a connecting screw (32222) penetrating from the arc surface of the rotating disk (322) into the guide groove (32221), and a limiting structure (32223) for limiting the sliding of the connecting screw (32222) along the guide groove (32221), wherein an end of the connecting screw (32222) close to the center of the rotating disk (322) is provided with a gap with the rotating disk (322), an end of the connecting screw (32222) away from the center of the rotating disk (322) extends outside the arc surface of the rotating disk (322), and the rotating column (3221) is threadedly connected to the portion of the connecting screw (32222) located in the guide groove (32221).

5. The testing device for distributed photovoltaic inverters according to claim 1, characterized in that: The platform portion (21) comprises a main structure (211) and a threaded rod (212); an inner cavity (2111) is provided inside the main structure (211); the threaded rod (212) penetrates the inner cavity (2111) from the side of the main structure (211) and is connected to a bearing fixedly arranged in the inner cavity (2111); the other end of the threaded rod (212) extends outside the main structure (211); The clamping portion (22) includes a first clamping plate (221) and a second clamping plate (222) arranged opposite to each other, wherein the first clamping plate (221) is fixedly connected to the upper end surface of the main structure (211), the threaded rod (212) passes through the second clamping plate (222) and is threadedly engaged with the second clamping plate (222), and a slideway (2112) is provided on the upper end surface of the main structure (211) along the length direction of the threaded rod (212) to connect with the inner cavity (2111) and for the second clamping plate (222) to move.

6. The test device for distributed photovoltaic inverters according to claim 1, characterized in that: The platform portion (21) includes a main structure (211), a first threaded rod (213) and a second threaded rod (214); a first inner cavity (2113) and a second inner cavity (2114) are symmetrically provided inside the main structure (211); the first threaded rod (213) penetrates into the first inner cavity (2113) from the side of the main structure (211) and is connected to a bearing fixedly arranged in the first inner cavity (2113); the second threaded rod (214) penetrates into the second inner cavity (2114) from the side of the main structure (211) opposite to the first threaded rod (213) and is connected to a bearing fixedly arranged in the second inner cavity (2114); the first threaded rod (213) and the second threaded rod (214) are coaxially arranged, and the other ends of the first threaded rod (213) and the second threaded rod (214) both extend outside the main structure (211); The clamping portion (22) includes a third clamping plate (223) and a fourth clamping plate (224) that are arranged opposite to each other, the first threaded rod (213) passes through the third clamping plate (223) and is threadedly engaged with the third clamping plate (223), the second threaded rod (214) passes through the fourth clamping plate (224) and is threadedly engaged with the fourth clamping plate (224), and the upper end surface of the main structure (211) is provided with a first slideway (2115) connected to the first inner cavity (2113) and for the movement of the third clamping plate (223) and a second slideway (2116) connected to the second inner cavity (2114) and for the movement of the fourth clamping plate (224) along the length direction of the first threaded rod (213) and the second threaded rod (214).

7. A testing device for distributed photovoltaic inverters according to claim 6, characterized in that: A rubber gasket (225) is provided on the opposite side of the third clamping plate (223) and the fourth clamping plate (224).

8. The test device for distributed photovoltaic inverters according to claim 1, characterized in that: The support mechanism (4) comprises a support sleeve rod (41) and a guide rod (42) slidably connected to the support sleeve rod (41), the bottom end of the support sleeve rod (41) is fixedly connected to the upper end surface of the base (1), and the top end of the guide rod (42) is fixedly connected to the lower end surface of the platform portion (21), and when the clamping platform (2) vibrates, the guide rod (42) slides downward along the length direction of the support sleeve rod (41).

9. A testing device for distributed photovoltaic inverters according to claim 8, characterized in that: The support mechanism (4) further comprises a return spring (43) sleeved outside the support sleeve rod (41), and two ends of the return spring (43) are fixedly connected to the upper end surface of the base (1) and the lower end surface of the platform portion (21), respectively.

10. A testing device for distributed photovoltaic inverters according to any one of claims 8 or 9, characterized in that: The vibration mechanism (3) is surrounded by a plurality of evenly arranged support mechanisms (4).

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