Heat dissipation device of alternating current filter capacitor module of wind power converter

Abstract

The utility model relates to the field of electronic component heat dissipation equipment, and discloses a heat dissipation device of a wind power converter alternating current filter capacitor module, which comprises an alternating current filter capacitor module, a guide frame is fixedly mounted on one side of the alternating current filter capacitor module, and a plurality of heat dissipation fans are fixedly mounted at one end, far away from the alternating current filter capacitor module, of the guide frame. The side, close to the alternating current filter capacitor module, of the inner wall of the guide frame is fixedly connected with a rectifying unit, and the side, away from the alternating current filter capacitor module, of the rectifying unit is fixedly connected with a flow equalizing plate, heat of the alternating current filter capacitor module can be dissipated more evenly, and therefore it is guaranteed that the heat dissipation effect is better.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation equipment for electronic components, specifically a heat dissipation device for AC filter capacitor modules of wind power converters. Background Technology

[0002] Currently, in wind power converter systems, AC filter capacitors are used as filters in the circuit, forming an LC filter with the filter inductor. They absorb harmonic currents of corresponding frequencies from the power grid, eliminating the harm of high-order harmonics to the main transformer or other electrical equipment in the system. They absorb grid harmonics, improving the system power factor and safety. During converter operation, the AC filter capacitor carries a large current, including harmonic currents, causing significant heat generation in the AC filter capacitor module. Therefore, its heat dissipation performance is a key indicator affecting reliability. In the power electronics industry, AC filter capacitors are typically cooled by natural or forced air. Natural cooling allows the capacitor's heat to dissipate naturally into the air. While this method provides uniform temperature dissipation, the capacitor's heat dissipation efficiency is low, and the capacitor cannot cool down quickly enough, thus limiting its filtering capacity. Forced cooling uses airflow to cool the AC filter capacitor. However, this results in uneven temperature distribution, leading to inconsistent heat dissipation. Based on the material characteristics of AC filter capacitors, the higher the temperature, the shorter the lifespan. This means that the overall lifespan of an AC filter capacitor module is limited by the hottest capacitor. When a capacitor fails due to overheating, the entire AC filter capacitor module needs to be replaced.

[0003] For example, utility model publication CN221079829U discloses a heat dissipation device for an AC filter capacitor module of a wind power converter, including an AC filter capacitor module, a heat exchanger, and cooling fans. The heat exchanger is located at the front end of the AC filter capacitor module, and heat-conducting liquid cooling pipes are evenly arranged inside the heat exchanger. Both ends of the heat-conducting liquid cooling pipes extend to the outside of the heat exchanger, and continuously variable speed (CVS) water pumps are connected to both ends of the heat-conducting liquid cooling pipes. The CVS water pumps are immersed in coolant. Multiple cooling fans are arranged side-by-side at the rear end of the AC filter capacitor module. This utility model can ensure uniform heat dissipation for each capacitor within the AC filter capacitor module of the wind power converter, improving heat dissipation efficiency and thus enhancing the reliability of the AC filter capacitor module.

[0004] The aforementioned heat dissipation device improves heat dissipation efficiency by absorbing heat from the AC filter capacitor module of the wind power converter through a heat dissipation fan installed on one side of the AC filter capacitor module. However, since the fan blades rotate, the wind speed near the center of the fan inlet is higher than that at the edge of the inlet. As a result, during the operation of the aforementioned device, the heat near the center of the heat dissipation fan is absorbed faster than the heat at the edge of the fan inlet, leading to uneven hot air extraction speed and uneven heat dissipation effect. Utility Model Content

[0005] The purpose of this invention is to provide a heat dissipation device for the AC filter capacitor module of a wind power converter, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a heat dissipation device for an AC filter capacitor module of a wind power converter, comprising an AC filter capacitor module, a guide frame fixedly installed on one side of the AC filter capacitor module, and a plurality of cooling fans fixedly installed on the end of the guide frame away from the AC filter capacitor module, a rectifier unit fixedly connected to the inner wall of the guide frame near the AC filter capacitor module, and a current equalization plate fixedly connected to the rectifier unit away from the AC filter capacitor module.

[0007] Preferably, the guide frame is a rectangular hollow structure, and the side of the guide frame away from the AC filter capacitor module is connected to the air intake of each cooling fan.

[0008] Preferably, the rectifier unit includes a rectifier plate fixedly connected to the inner wall of the guide frame, and the rectifier plate is uniformly provided with a plurality of rectifier slots along the horizontal direction.

[0009] Preferably, each of the rectifier slots has a < shape.

[0010] Preferably, the flow equalization plate is a honeycomb porous plate.

[0011] Compared with the prior art, the advantages of this utility model are as follows:

[0012] This invention utilizes several centrifugal cooling fans to draw out the heat generated within the AC filter capacitor module during the suction process of these fans, thereby promoting heat dissipation. A rectangular hollow guide frame is positioned between the AC filter capacitor module and the cooling fans to guide the hot air suction. Multiple rectifier slots on the rectifier plate further rectify the airflow during the cooling fan suction process. Combined with the effect of the honeycomb porous flow equalization plate, the speed at which heat is dissipated from the AC filter capacitor module during the suction process of the multiple cooling fans is more uniform, resulting in better heat dissipation within the AC filter capacitor module. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is an enlarged schematic diagram of the structure at point A of this utility model.

[0015] In the diagram: 1. AC filter capacitor module; 2. Guide frame; 3. Cooling fan; 4. Rectifier unit; 5. Flow equalization plate; 6. Heat exchanger; 41. Rectifier plate; 42. Rectifier slot. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1

[0018] Please see Figures 1-2 The figure shows a heat dissipation device for an AC filter capacitor module of a wind power converter, including an AC filter capacitor module 1. A guide frame 2 is fixedly installed on one side of the AC filter capacitor module 1, and several cooling fans 3 are fixedly installed on the end of the guide frame 2 away from the AC filter capacitor module 1. A rectifier unit 4 is fixedly connected to the inner wall of the guide frame 2 near the AC filter capacitor module 1, and a current equalization plate 5 is fixedly connected to the side of the rectifier unit 4 away from the AC filter capacitor module 1.

[0019] In this embodiment, the guide frame 2 is a rectangular hollow structure, and the side of the guide frame 2 away from the AC filter capacitor module 1 is connected to the air intake of each heat dissipation fan 3. The rectifier unit 4 includes a rectifier plate 41 fixedly connected to the inner wall of the guide frame 2, and the rectifier plate 41 is evenly provided with a plurality of rectifier slots 42 in the horizontal direction. Each rectifier slot 42 is < shaped. The flow equalization plate 5 is a honeycomb porous plate. A heat exchanger 6 is also provided on the other side of the AC filter capacitor module 1. The AC filter capacitor module 1 and the heat exchanger 6 have been fully disclosed in the prior art, and will not be described in detail here.

[0020] Furthermore, several cooling fans 3 are centrifugal fans, and the heat generated in the AC filter capacitor module 1 is drawn out through the air intake process of multiple cooling fans 3, thereby promoting the heat dissipation process. A rectangular hollow guide frame 2 is set between the AC filter capacitor module 1 and the cooling fans 3 to guide the hot air intake. The airflow during the air intake process of the cooling fans 3 is rectified by multiple rectifier slots 42 opened in the rectifier plate 41. Combined with the effect of the honeycomb porous flow equalization plate 5, the speed at which the heat is dissipated from the AC filter capacitor module 1 during the air intake process of multiple cooling fans 3 is more uniform, thereby making the heat dissipation effect in the AC filter capacitor module 1 better.

[0021] The working principle of this utility model is as follows: Several cooling fans 3 are centrifugal fans, and the heat generated in the AC filter capacitor module 1 is drawn out through the air intake process of multiple cooling fans 3, thereby promoting the heat dissipation process. A rectangular hollow guide frame 2 is set between the AC filter capacitor module 1 and the cooling fans 3 to guide the hot air intake. The airflow during the air intake process of the cooling fans 3 is rectified by multiple rectifier slots 42 opened by the rectifier plate 41. Combined with the effect of the honeycomb porous flow equalization plate 5, the speed at which the heat is dissipated from the AC filter capacitor module 1 during the air intake process of multiple cooling fans 3 is more uniform, thereby making the heat dissipation effect in the AC filter capacitor module 1 better.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat dissipation device for an AC filter capacitor module of a wind power converter, comprising an AC filter capacitor module (1), characterized in that: A guide frame (2) is fixedly installed on one side of the AC filter capacitor module (1), and several cooling fans (3) are fixedly installed on the end of the guide frame (2) away from the AC filter capacitor module (1). A rectifier unit (4) is fixedly connected to the inner wall of the guide frame (2) near the AC filter capacitor module (1), and a current equalization plate (5) is fixedly connected to the side of the rectifier unit (4) away from the AC filter capacitor module (1).

2. The heat dissipation device for the AC filter capacitor module of a wind power converter according to claim 1, characterized in that: The guide frame (2) is a rectangular hollow structure, and the side of the guide frame (2) away from the AC filter capacitor module (1) is connected to the air intake of each heat dissipation fan (3).

3. The heat dissipation device for the AC filter capacitor module of a wind power converter according to claim 2, characterized in that: The rectifier unit (4) includes a rectifier plate (41) fixedly connected to the inner wall of the guide frame (2), and the rectifier plate (41) is evenly provided with a plurality of rectifier slots (42) in the horizontal direction.

4. The heat dissipation device for the AC filter capacitor module of a wind power converter according to claim 3, characterized in that: Each of the rectifier slots (42) is of a < shape.

5. A heat dissipation device for an AC filter capacitor module of a wind power converter according to claim 4, characterized in that: The flow equalization plate (5) is a honeycomb porous plate.

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