Front self-dedusting system for air-cooled energy storage converter

Abstract

The invention discloses a front self-dedusting system for an air-cooled energy storage converter, which comprises an overflowing cavity, the overflowing cavity is positioned at the upstream of a heat dissipation air duct of the air-cooled energy storage converter and is communicated with the heat dissipation air duct, the middle part of the overflowing cavity is provided with a reducing throat part, and the throat part is communicated with the overflowing cavity; a plurality of dust collection holes are densely distributed in the overflowing cavity corresponding to the throat area; the air inlet fluid director is arranged at an upstream air inlet of the overflowing cavity, and a dust collecting opening is formed in the position, close to the downstream of the air inlet fluid director, of the overflowing cavity; and the dust collecting box is arranged on the outer side of the overflowing cavity and receives impurity particles falling from the dust collecting opening and the dust collecting hole respectively. The device is simple in structure, is integrated in front of a heat dissipation air channel of the air-cooled energy storage converter, can carry out dust falling treatment on airflow entering the air-cooled energy storage converter, prolongs the service life of heat dissipation equipment, and improves the performance of the heat dissipation equipment.

Description

Technical Field

[0001] This invention belongs to the field of heat dissipation and maintenance technology of power electronic equipment, and specifically relates to a pre-cooled self-dust removal system for air-cooled energy storage converters. Background Technology

[0002] As the core equipment of an energy storage system, the energy storage converter generates a large amount of heat during operation. Air cooling is widely used in low- and medium-power energy storage converters due to its low cost, simple structure, and high reliability. However, converters typically operate in dusty environments such as industrial plants and outdoors, and dust and lint inevitably accumulate in their cooling ducts and fins.

[0003] Air-cooled energy storage converters remove heat generated by internal components through forced airflow, thereby ensuring stable and efficient operation of the equipment within a suitable temperature range.

[0004] However, existing air-cooled cooling often adsorbs a large amount of dust or impurities, thus affecting heat dissipation efficiency and the orderly operation of electronic components inside the chassis. The existing dust removal methods mainly have the following problems: (1) Manual cleaning: It requires the equipment to be shut down and personnel to be arranged to open the chassis for cleaning or blowing regularly. The maintenance cost is high, the efficiency is low, and there is a risk of personal safety and equipment damage. (2) Adding dust screens: Although they can block some large dust particles, fine dust will still pass through. Moreover, the dust screens themselves will increase wind resistance and reduce heat dissipation efficiency, requiring frequent cleaning or replacement. (3) No active dust removal function: When existing air-cooled converters are designed, their fans are only used to drive airflow for heat dissipation and do not have the ability to remove dust using their own structure. Long-term accumulation of dust will block the air duct, cover the fan blades and the surface of the heat sink, leading to secondary problems such as fan dynamic balance failure, increased vibration and noise, and reduced airflow. It will also seriously deteriorate the heat dissipation effect, thereby causing the junction temperature of the core components of the converter (such as IGBT) to rise, reliability to decrease, lifespan to shorten, and even overheating failure.

[0005] Therefore, how to provide a pre-dust removal system for air-cooled energy storage converters is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a pre-dust removal system for air-cooled energy storage converters, which can perform dust removal before the airflow enters the fan, without relying on additional power consumption. It uses the power of the fan in the air-cooled energy storage converter cooling system to induce dust removal, thereby achieving comprehensive protection for the cooling fan and radiator to maintain their long-term stable heat dissipation performance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a pre-cooled self-dust removal system for an air-cooled energy storage converter, characterized in that it includes: a flow chamber, the flow chamber being located upstream of the heat dissipation duct of the air-cooled energy storage converter and communicating with the heat dissipation duct, the flow chamber having a narrowed throat in the middle, and the flow chamber having a plurality of dust collection holes densely distributed in the throat area. An air inlet guide is provided, wherein the air inlet guide is located at the upstream air inlet of the flow passage cavity, and a dust collection port is provided in the flow passage cavity near the downstream of the air inlet guide; A dust collection box is located on the outside of the flow cavity and receives impurity particles falling from the dust collection port and dust collection hole respectively.

[0008] The beneficial effects of this invention are as follows: The flow passage is located upstream of the heat dissipation duct of the air-cooled energy storage converter. Relying on the fan of the air-cooled energy storage converter itself, the airflow direction can be changed when passing through the air inlet guide, making it into a cyclone state. Based on the centrifugal force, impurities and particles in the airflow are thrown towards the inner wall of the flow passage and then collected into the dust collection box through the dust collection port on the bottom side. Most of the impurities and particles can be removed. When the airflow enters the throat area, the static pressure is lowest here due to the drastic change in the flow area. The impurities or particles carried by the airflow collide with the throat wall, and the pressure difference at the dust collection hole forms a wall-attached shear flow that peels off the particles attached to the wall and sucks them into the dust collection box. The principle is as follows: the pressure difference (Pdust collection box > Pthroat) drives the airflow from the dust collection box to the throat. The airflow flowing out of the dust collection box through the dust collection hole is subjected to the shear force of the main airflow in the central area of ​​the throat (the high-speed zone of the main airflow is in the center of the throat, and the flow velocity near the wall is extremely low, the fundamental reason being the "viscosity" and "no-slip boundary conditions" of the fluid). As a result, this secondary flow actually forms a "wall-attached jet" or "sweeping airflow" that starts from the dust collection hole outlet, adheres closely to the throat wall, and flows downstream at high speed (i.e., in the direction of the Venturi tube's gradually expanding section). Then, based on the inertia of impurities and particles, it is collected by the dust collection hole above and falls into the dust collection box for further dust reduction. After two stages of dust reduction, the airflow enters the heat dissipation duct and passes through the fan and subsequent radiator. Due to the removal of impurities in the preceding airflow, comprehensive protection of the cooling fan and radiator can be achieved to maintain their long-term stable heat dissipation performance.

[0009] Preferably, the flow passage cavity has a tapered narrowing section, a straight flow passage section and a horn-shaped widening section in sequence along the axial direction corresponding to the throat region. The tapered narrowing section forms a windward slope, and the dust collection holes are provided on the windward slope and the straight flow passage corresponding to the flow passage cavity.

[0010] The resulting technical effect is as follows: due to the conical narrowing section, an air inlet slope is formed in this section. Impurities and particles are blocked by the air inlet slope and can move along the slope wall. This process will flow from the dust collection hole to the dust collection box, completing the further removal of impurities and particles. In addition, due to the rapid streamline change of the airflow at the throat, the impurities and particles carried in the airflow cannot synchronize with the flow direction curve of the airflow in time due to the inertial force. That is, some impurities and particles are collected by the dust collection hole of the straight flow section.

[0011] Preferably, the air inlet guide is provided with a plurality of arc-shaped blades in the circumferential direction to change the air inlet direction, and a curved air guide channel is formed between adjacent arc-shaped blades, the air guide channel guiding the external air spiral into the flow cavity.

[0012] The resulting technical effect is that the air inlet guide is unpowered, and its purpose is to change the air inlet direction from horizontal axial air inlet to tangential air inlet, in order to generate centrifugal force and separate impurities and particles in the airflow.

[0013] Preferably, a feed pipe is connected between the dust collection box and the plurality of dust collection holes, and the feed pipe guides the dust particles falling into the dust collection holes into the dust collection box.

[0014] The resulting technical effect is that, due to the dense distribution of dust collection holes, it is necessary to establish a material passage relationship between the material pipe and the dust collection box.

[0015] Preferably, the bottom side of the dust collection box is provided with a dust discharge pipe, the dust discharge pipe is a straight pipe and is provided with a one-way valve to facilitate the discharge of impurities, and the outlet of the dust discharge pipe is provided with a rain cover.

[0016] The resulting technical effect is that the one-way valve on the dust discharge pipe prevents impurity particles from entering the flow chamber in reverse, and does not affect the subsequent dust discharge process.

[0017] Preferably, the dust collection box includes a first dust collection box and a second dust collection box. The first dust collection box receives the material falling from the dust collection port, and the second dust collection box collects the material falling from the dust collection hole. A material passage pipe is connected between the second dust collection box and the dust collection hole. Dust discharge pipes are connected to the bottom sides of both the first dust collection box and the second dust collection box.

[0018] The resulting technical effect is that the dust collection box can be set up independently, with the dust collection port and dust collection hole sharing the same space, or multiple boxes can be set up, with the dust collection port and dust collection hole each using a separate dust collection box, depending on the layout requirements.

[0019] Preferably, a fan is installed inside the heat dissipation duct. The fan draws external airflow into the flow cavity. Before entering the heat dissipation duct, the external airflow is pre-dust removed by the air inlet guide and dust collection port, and then undergoes secondary dust removal through the dust collection hole at the throat of the flow cavity.

[0020] The resulting technical effect is that the fan is a feature of the existing air-cooled energy storage converter system. Based on its air intake, the system's own power is used to achieve a highly efficient multi-stage self-dust removal effect without increasing additional energy consumption or requiring shutdown.

[0021] Preferably, the two inner sidewalls of the flow cavity are provided with slopes for guiding material to the dust collection port, and the dust collection port is provided on the sidewall and / or bottom wall of the flow cavity.

[0022] The resulting technical effect is that the curved sidewalls of the cavity facilitate the sliding of impurity particles thrown against the cavity walls down to the bottom or the dust collection port on the sidewall, making them easier to collect automatically. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the layout of a pre-cooled self-dust removal system for an air-cooled energy storage converter according to the present invention.

[0024] 1. Flow cavity, 11. Throat, 111. Conical narrowing section, 112. Straight flow section, 113. Horn-shaped widening section, 12. Dust collection hole, 2. Heat dissipation duct, 3. Air inlet guide, 31. Arc-shaped fan blade, 32. Air guide duct, 4. Dust collection port, 5. Dust collection box, 51. First dust collection box, 52. Second dust collection box, 6. Material passage pipe, 7. Dust discharge pipe, 8. Fan. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Air-cooled energy storage converters, such as 100kW or 125kW, have an overall structure resembling a brick-shaped cuboid. Internally, they are generally divided into upper and lower layers. The lower layer is the main heat dissipation area, which typically consists of a cooling fan, a heat sink, and an inductor or circuit board. The airflow channels in front of and behind the cooling fan form the heat dissipation airflow channels. (See the appendix of this invention.) Figure 1According to an embodiment of the present invention, a pre-dust removal system for an air-cooled energy storage converter includes: a flow chamber 1, which is located upstream of the heat dissipation duct 2 of the air-cooled energy storage converter and is connected to the heat dissipation duct 2; a narrowed throat 11 is provided in the middle of the flow chamber 1; and a plurality of dust collection holes 12 are densely distributed in the throat area of ​​the flow chamber 1. An air inlet guide 3 is provided at the upstream air inlet of the flow passage 1, and a dust collection port 4 is provided at the downstream of the flow passage 1 near the air inlet guide 3. Dust collection box 5 is located outside the flow cavity 1 and receives impurity particles falling from dust collection port 4 and dust collection hole 12 respectively. In other embodiments, the flow cavity 1 is provided with a tapered narrowing section 111, a straight flow section 112 and a horn-shaped widening section 113 in the axial direction corresponding to the throat region. The tapered narrowing section 111 forms a windward slope, and dust collection holes 12 are provided on the windward slope and the straight flow section 112 corresponding to the flow cavity 1.

[0027] In some other specific embodiments, the air inlet guide 3 is provided with a plurality of arc-shaped blades 31 in the circumferential direction to change the air inlet direction, and a curved guide air duct 32 is formed between adjacent arc-shaped blades 31, and the guide air duct 32 guides the external air spiral into the flow cavity 1.

[0028] In some other embodiments, a feed pipe 6 is connected between the dust collection box 5 and a plurality of dust collection holes 12, and the feed pipe 6 guides the dust particles falling into the dust collection holes into the dust collection box 5.

[0029] In some other specific embodiments, a dust discharge pipe 7 is provided on the bottom side of the dust collection box 5. The dust discharge pipe 7 is a straight pipe and is equipped with a one-way valve to facilitate the discharge of impurities. A rain cover is provided at the outlet of the dust discharge pipe 7.

[0030] In some other embodiments, the dust collection box 5 includes a first dust collection box 51 and a second dust collection box 52. The first dust collection box 51 receives the material falling from the dust collection port 4, and the second dust collection box 52 collects the material falling from the dust collection hole 12. A material passage pipe 6 is connected between the second dust collection box 52 and the dust collection hole 12. A dust discharge pipe 7 is connected to the bottom side of both the first dust collection box 51 and the second dust collection box 52.

[0031] In some other embodiments, a fan 8 is provided in the heat dissipation duct 2. The fan 8 drives the external airflow into the flow cavity 1. Before entering the heat dissipation duct 2, the external airflow is pre-dust removed by the air inlet guide 3 and the dust collection port, and then passes through the throat of the flow cavity 1 for secondary dust removal by the dust collection hole.

[0032] In other embodiments, the internal cavity of the flow passage 1 has a circular or elliptical cross-section to facilitate the flow of material into the dust collection port, and the dust collection port 4 is provided on the side wall and / or bottom wall of the flow passage 1.

[0033] Before the fan enters the converter duct, the air inlet guide can achieve pre-dust separation. When the airflow passes through the throat of the flow cavity, impurities and particles fall into the dust collection hole due to inertial force and are collected. The two-stage dust removal is integrated in series.

[0034] In the first stage: the dust-laden intake air forms a high-speed rotating airflow after passing through the intake air guide. Under the strong centrifugal force, larger dust particles are thrown against the inner wall of the flow chamber. The pre-purified airflow then enters the second stage. The airflow from the first stage enters the throat, where the flow velocity reaches its peak and the static pressure drops to its trough, forming a strong negative pressure zone. This negative pressure acts on the dust collection box through micropores. Dust particles with large inertia remaining in the airflow cannot change abruptly with the airflow streamline at the throat and are captured by the dust collection holes. Finally, the clean airflow, after being doubly purified, is restored to pressure in the diffuser section and then sent to the cooling fan.

[0035] The entire system's workflow is as follows: inertia "delivers" dust to the wall surface → the wall-mounted shear flow "strips" the dust and "sweeps" it laterally into the dust collection box → inside the dust collection box, the dust quickly "sinks" to the bottom due to the sudden drop in flow velocity and gravity → clean air is drawn back to the throat to form a secondary flow → the settled dust is finally discharged from the system through the dust discharge pipe under the action of pressure difference and / or gravity.

[0036] The present invention has the following significant beneficial effects: (1) graded dust removal, maximizing efficiency: the air inlet guide efficiently removes large dust particles, while the throat of the flow chamber captures particles in the remaining airflow. The two stages work together to achieve extremely high overall dust removal efficiency, realizing deep purification of cooling air. At the same time, the pre-stage cyclone removes a large number of abrasive large particles, reducing the wear and tear on the throat and the processing burden, and extending the life of the device.

[0037] (2) Zero energy consumption increment, ingenious structure: The equipment uses its own operating power (fan) to achieve continuous automatic dust removal without increasing additional energy consumption. Only through the ingenious fluid structure design, the original "heat dissipation airflow" is transformed into "dust removal power", realizing the integration and optimization of functions, reducing the dependence on regular manual maintenance, and ensuring the maximum online operating time of the equipment.

[0038] (3) Dust removal at the source, double protection: not only removes dust before the airflow reaches the radiator, but also protects the cooling fan itself, avoiding the problems of dynamic balance damage, vibration, noise and efficiency reduction caused by dust accumulation on the fan blades, and achieving comprehensive protection of the cooling system.

[0039] (4) High reliability and extended lifespan: By keeping the heat dissipation system clean, the power devices such as IGBTs are kept below the allowable junction temperature, which greatly improves the operating reliability and overall lifespan of the converter.

[0040] (5) Low cost and easy to implement: The structure is simple and can be designed and manufactured in an integrated manner with the existing air duct. The increased manufacturing cost is extremely low and hardly changes the existing production process, but brings huge maintenance value.

[0041] (6) As the apparatus and method of use disclosed in the embodiments correspond to the methods disclosed in the embodiments, the description is relatively simple. For relevant parts, please refer to the description in the method section.

[0042] (7) The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pre-cooled self-dust removal system for an air-cooled energy storage converter, characterized in that, include: The flow chamber (1) is located upstream of the heat dissipation duct (2) of the air-cooled energy storage converter and is connected to the heat dissipation duct (2). The flow chamber (1) has a narrowed throat (11) in the middle and several dust collection holes (12) are densely distributed in the throat area of ​​the flow chamber (1). An air inlet guide (3) is provided at the upstream air inlet of the flow cavity (1), and a dust collection port (4) is provided in the downstream of the air inlet guide (3) near the flow cavity (1). Dust collection box (5) is located on the outside of the flow cavity (1) and receives the impurity particles falling from the dust collection port (4) and the dust collection hole (12).

2. The pre-cooled self-dust removal system for an air-cooled energy storage converter according to claim 1, characterized in that, The flow passage (1) is provided with a tapered narrowing section (111), a straight flow passage (112) and a horn-shaped widening section (113) in the axial direction corresponding to the throat area. The tapered narrowing section (111) forms a windward slope. The dust collection hole (12) is provided on the windward slope and the straight flow passage (112) corresponding to the flow passage (1).

3. The pre-cooled self-dust removal system for an air-cooled energy storage converter according to claim 1, characterized in that, The air inlet guide (3) has several arc-shaped blades (31) in the circumferential direction to change the air inlet direction. A curved air guide channel (32) is formed between adjacent arc-shaped blades (31), and the air guide channel (32) guides the external air spiral into the flow cavity (1).

4. The pre-cooled self-dust removal system for an air-cooled energy storage converter according to claim 1, characterized in that, The dust collection box (5) is connected to a feed pipe (6) between the dust collection box (5) and the dust collection holes (12). The feed pipe (6) guides the dust particles that fall into the dust collection holes into the dust collection box (5).

5. A pre-cooled self-dust removal system for an air-cooled energy storage converter according to claim 4, characterized in that, The dust collection box (5) is provided with a dust discharge pipe (7) on the bottom side. The dust discharge pipe (7) is a straight pipe and is provided with a one-way valve to facilitate the discharge of impurities. The outlet of the dust discharge pipe (7) is provided with a rain cover.

6. A pre-cooled self-dust removal system for an air-cooled energy storage converter according to claim 4, characterized in that, The dust collection box (5) includes a first dust collection box (51) and a second dust collection box (52). The first dust collection box (51) receives the material falling from the dust collection port (4), and the second dust collection box (52) collects the material falling from the dust collection hole (12). A feed pipe (6) is connected between the second dust collection box (52) and the dust collection hole (12). A dust discharge pipe (7) is connected to the bottom side of both the first dust collection box (51) and the second dust collection box (52).

7. A pre-cooled self-dust removal system for an air-cooled energy storage converter according to claim 1, characterized in that, A fan (8) is installed inside the heat dissipation duct (2). The fan (8) draws external airflow into the flow cavity (1). Before entering the heat dissipation duct (2), the external airflow is pre-dust removed by the air inlet guide (3) and the dust collection port, and then passes through the throat of the flow cavity (1) for secondary dust removal by the dust collection hole.

8. A pre-cooled self-dust removal system for an air-cooled energy storage converter according to claim 1, characterized in that, The two inner sidewalls of the flow cavity (1) are provided with slopes for guiding material toward the dust collection port, and the dust collection port (4) is provided on the sidewall and / or bottom wall of the flow cavity (1).

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