Patent ID: 12238885

wherein,100—container body,101—first accommodation space,102—second accommodation space,103—third accommodation space,104—supporting frame,105—supporting beam;200—inlet cable unit,201—high voltage distribution cabinet,202—inlet cable terminal,203—inlet cable supporting bracket,2031—inlet cable hole,204—inlet cable opening,205—excitation component,206—first inlet cable guiding plate,207—second inlet cable guiding plate;300—power transformation unit;400—inverter unit,401—low voltage component,4021—rectifier component,4022—first inverter component,4023—second inverter component,403—variable frequency drive unit,404—cable outlet unit;501—second cooling fan cabinet,502—water-cooling plate;701—first cooling fan cabinet,702—air inlet,703—air outlet,704—air outlet duct.

DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE PRESENT INVENTION

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

To make objects, technical solutions and advantages clearer, embodiments of the present invention will be described in conjunction with the accompanying drawings. Obviously, the described embodiments are merely a part based on the present invention and other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that in the description of the present invention, terms ‘upper’, ‘lower’, ‘left’, ‘right’, ‘vertical’, ‘horizontal’, ‘inner’, ‘outer’ and the like only indicate directions or positional relationship shown in the drawings, which is only for a clear description and does not indicate or imply that devices or elements must have, or be constructed, or be operated in, a specific orientation, and therefore could not be understood as limitations of the present invention. In addition, the terms ‘first’ and ‘second’ are only used for descriptive purposes, and could not be understood as indication or implication of relative importance.

The present invention aims to reduce the size of vehicle-mounted variable-frequency drive skid in the prior art so as to make it suitable for vehicle-mounted working conditions.

Specifically, as shown inFIG.1toFIG.3, a vehicle-mounted variable-frequency drive skid includes a container body100, an inlet cable unit200, a power transformation unit300and an inverter unit400.

The interior of the container body100is divided into three accommodation spaces in sequence: a first accommodation space101, a second accommodation space102and a third accommodation space103; a supporting frame104with a set height is connected to the bottom of the container body100. The inlet cable unit200is arranged in the first accommodation space101, the power transformation unit300is arranged in the second accommodation space102, and the inverter unit400is arranged in the third accommodation space103.

As shown inFIG.1andFIG.3, a plurality of supporting beams105are installed on a bottom plate of the container body100, and the height of each supporting beams105are smaller than the set height of the supporting frame104, so that the container body100has a sinking structure relative to the supporting frame104. With these arrangements, the overall height of the variable-frequency drive skid is reduced vertically, thereby reducing the overall size of the variable-frequency drive skid.

As shown inFIG.1andFIG.2, the inlet cable unit200includes a high voltage distribution cabinet201and an inlet cable component arranged in the first accommodation space101, wherein the inlet cable component includes inlet cable terminals202and an inlet cable supporting bracket203; the inlet cable supporting bracket203is in the shape of C opened with inlet cable holes2031on its top plate; the inlet cable terminals202are vertically inserted in the inlet cable holes2031for fixation; a bottom plate of the container body100is opened with inlet cable openings204corresponding to the inlet cable holes2031.

In variable-frequency drive skid of the prior art, inlet cable terminals are inserted from side of container body of the variable-frequency drive skid along a horizontal direction. Determined by the length of the inlet cable terminal, it has to connect the inlet cable after insertion and add inlet cable steering structures, which occupies much space along the horizontal direction resulting in a larger width of the container body, in the meanwhile vertical space around the inlet cable unit is empty and wasted. But in the present invention, because the inlet cable holes2031are opened on the top plate of the inlet cable supporting bracket203and inlet cable openings204are opened on the bottom of the container body, cables are fed from the bottom of the container body, and the inlet cable terminals202could be directly connected with the inlet cables fed in. Compared with the horizontal cable arrangement in the prior art, the vertical fixed inlet cable terminals202greatly reduces the space occupied by the inlet cable component horizontally, and further reduces the width of the variable-frequency drive skid horizontally, so the overall size of the variable-frequency drive skid is being limited.

In some embodiments of the present invention, as shown inFIG.1, the inlet cable component further includes a first inlet cable guiding plate206and a second inlet cable guiding plate207; the first inlet cable guiding plate206is installed under the inlet cable supporting bracket203, on which first inlet cable guiding holes are opened corresponding to where the inlet cable holes2031are opened on the top plate of the inlet cable supporting bracket203; the second inlet cable guiding plate207is installed above the inlet cable supporting bracket203, on which second inlet cable guiding holes are opened corresponding to where the inlet cable holes2031are opened on the top plate of the inlet cable supporting bracket203. The first inlet cable guiding plate206and the second inlet cable guiding plate207could respectively guide, classify and fix the inlet cables on both of the top side and the bottom side, the inlet cables finally enter the high voltage distribution cabinet201from the top side.

In the present invention, as shown inFIG.2, the excitation component205of the inlet cable unit200is disassembled and arranged in the second accommodation space102independently, thereby reducing the space occupied by the inlet cable unit and minimizing the height of the container body of the variable-frequency drive skid. To be specific, the power transformation unit300is arranged in the middle of the second accommodation space102longitudinally and the excitation component205is arranged on a side of the power transformation unit arranged in the second accommodation space102.

In the variable-frequency drive skid of the prior art, spaces on both sides of the power transformation unit300is empty and wasted, but in the present invention, the excitation component205of the inlet cable unit200is disassembled and arranged on a side of the power transformation unit300, so empty spaces around the power transformation unit300is used; space that the high voltage distribution cabinet201of the inlet cable unit200is occupied and the overall length of the variable-frequency drive are limited.

As shown inFIG.1, in the third accommodation space103where the inverter unit400is located, a second heat dissipation unit for cooling the inverter unit400is provided. The second heat dissipation unit includes a second cooling fan cabinet501, a heat exchanger and a water-cooling plate502, wherein the second cooling fan cabinet501is installed on an upper part of the inverter unit400with an upward airflow, the heat exchanger (not shown in the drawings) is installed in the second cooling fan cabinet501, and the water-cooling plate502is installed close to a side of the inverter unit400. The water-cooling plate502includes a water inlet, a water outlet and a water pipe where water circulates provided with to connect the water inlet and the water outlet, wherein the water pipe is connected with the heat exchanger or penetrates through the heat exchanger. The water pipe and the water-cooling plate are full of water as a medium.

When the second heat dissipation unit starts, water circulates between the water pipe and the water-cooling plate502by a water pump. During a process when water flows in the water-cooling plate502, water at a lower temperature absorbs and takes away heat generated by the inverter unit400for cooling, then flowing back to the water pipe after heat exchange. The heat exchanger further removes heat from the heated water and the removed heat is taken away by the second cooling fan cabinet501to the ambient. Then water at a higher temperature turns into water at a lower temperature again and the next heat exchange cycle starts.

The second cooling fan cabinet501in the present invention is installed on the upper part of the inverter unit400. Compared with a lateral arrangement of the container body in the prior art, especially in the cooling part for the inverter unit400, a lateral air outlet structure is upgraded as an upward air outlet structure, which could further reduce the length of the variable-frequency skid and limit the overall size, much more suitable for vehicle-mounted conditions.

In some embodiments of the present invention, as shown inFIG.1toFIG.3, the second accommodation space102is provided with a first heat dissipation unit to cool the power transformation unit300. The first heat dissipation unit includes first heat dissipation fan cabinets701, an air inlet702, an air outlet703and an air outlet duct704, wherein the first cooling fan cabinets701are installed on an upper part of the power transformation unit300and are fixed with a top plate of the container body100; the air inlet702is opened on a lower part of a first side wall of the container body, the first side wall is the opposite side where the excitation component205is installed; the air outlet703is opened on an upper part of a second side wall of the container body100, the second side wall is on the same side as where the excitation component205is on and is opposite to the first side wall; the air outlet duct704is provided among the first cooling fan cabinets701and the air outlet703for connection.

When the first heat dissipation unit starts, ambient air enters the second accommodation space102from the air inlet702under the suction of the first cooling fan cabinets701. The upward airflow removes heat from the power transformation unit300to lower its temperature. Heated air after heat exchange with the power transformation unit300is discharged through the air outlet duct704and the air outlet703.

In the embodiment of the present invention, the air outlet703is located at an upper part of the container body100, and the air inlet port702is located at a lower part of the container body100, disposed on both sides of the power transformation unit300respectively, so air could flow into from the bottom part of the container body and moves upwards during which heat could be fully removed from the power transformation unit300and the cooling efficiency could be improved.

Optionally, the air inlet702and the air outlet703are provided with rain-proof shutters620to prevent external miscellaneous from entering the second accommodation space102.

Rather than being fixed on the upper part of the power transformation unit300in the prior art, the first cooling fan cabinets701according to the present invention are fixed on the top plate of the container body100. Therefore, vibration generated during the work of the first cooling fan cabinet701for heat dissipation will not affect the power transformation unit300because the power transformation unit300is relatively independent with each first cooling fan cabinet701. Moreover, vibration damping foam is preferably disposed between the first cooling fan cabinets701and the power transformation unit300to avoid collisions on the power transformation unit300caused by the first cooling fan cabinets701vibrated greatly, especially where only a narrow gap is formed. The vibration damping foam could be in a shape of ring and disposed on a side of each first cooling fan cabinet701or in a shape of strip and disposed on a casing of each first cooling fan cabinet701at intervals.

In some embodiments of the present invention, as shown inFIG.2, the inverter unit400includes a low voltage component401and a high voltage component; the third accommodation space103adopts a grid layout, wherein the low voltage component401is arranged in one cell while the high voltage component is arranged in another two cells. The layout could separate the high voltage component from the low voltage component and provide a safety protection for operators.

Specifically, the high-voltage component includes a rectifier component4021, a first inverter component4022and a second inverter component4023; wherein the rectifier component4021is arranged adjacent to the first inverter component4022, and the second inverter component4023is adjacent to the first inverter component4023. The first inverter component4022and the second inverter component4023are arranged vertically from top to bottom.

A variable frequency drive unit403configured to drive the fan and the water pump in the second heat dissipation unit and a cable outlet unit404are further disposed in the third accommodation space103.

It should be noted that the above description is not intended to limit the present invention, and the present invention is not limited to the above described embodiments. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the essential scope of the present invention, should also belong to the protection scope of the present invention.