Air cooling system of high-voltage frequency converter

Abstract

The invention relates to an air cooling system of a high-voltage frequency converter, which is characterized in that the high-voltage frequency converter is provided with a power conversion unit subarea and a transformer subarea which are arranged in a cabinet front and back side by side, and the upper part of the transformer subarea is provided with a flow adjusting structure; the air cooling system comprises a power conversion unit subarea air duct formed in the power conversion unit subarea, a transformer subarea air duct which is communicated with the power conversion unit subarea air duct and formed in the lower portion of the transformer subarea, and a public air duct which is communicated with the transformer subarea air duct and formed in the flow adjusting structure and serves as the upper portion of the transformer subarea. The flow adjusting structure is detachably provided with an automatic adjuster capable of automatically adjusting opening and closing, and when the automatic adjuster is closed, a first flow path through which cooling air flows out sequentially through the power conversion unit partition air duct, the transformer partition air duct and the public air duct is formed. When the automatic regulator is started, a first flow path and a second flow path are formed, wherein cooling air sequentially passes through the power conversion unit partition air channels and then directly enters the public air channel to flow out.

Description

Technical Field

[0001] The invention relates to an air cooling system for a high-voltage frequency converter, and in particular to an air cooling system for a high-voltage frequency converter capable of automatically adjusting the cooling air flow rate of each partition. Background Art

[0002] With the continuous development of power electronics and microelectronics, high-voltage inverters are evolving towards higher power density and smaller size. This not only requires the performance of the equipment to be improved, but also puts higher requirements on the cooling system. The air cooling system of the integrated high-voltage inverter with higher power density on the market is a series duct structure (refer to Figure 7 ).

[0003] In the case of this series duct structure, if Figure 1 As shown, the heat dissipation air, i.e., cold air, enters from the air filter door plate, passes through the power conversion unit partition located at the front side and is heated, and then passes through the transformer partition located at the rear side and is further heated, and finally becomes hot air and is discharged by the cooling fan. Since a vertical partition is provided between the power conversion unit partition and the transformer partition, the vertical partition seals and isolates the front and rear partitions, so that the front and rear partitions form a complete series air path, and therefore the cooling air flow of the two partitions is equal.

[0004] The above-mentioned series air duct structure has the following problems, for example:

[0005] 1. The overall flow resistance of the series air duct structure is fixed. The flow resistance of the overall air cooling system cannot be adjusted according to actual needs, the total flow of the air cooling system cannot be adjusted, and the temperature of the hot air discharged by the cooling fan cannot be changed, resulting in the inability to adjust the life of the cooling fan 1 and the inability to extend the fan life by lowering the exhaust temperature.

[0006] 2. When the cooling requirements of the power conversion unit partition and the transformer partition change, the cooling air flow of each partition of the equipment cannot be automatically adjusted as needed, and different cooling effects cannot be controlled for each partition.

[0007] 3. The design of the series air duct structure is fixed and cannot be adjusted dynamically according to different operating conditions. This means that under different working conditions, the cooling system cannot optimize its performance and cannot adapt to different heat dissipation requirements. Summary of the invention

[0008] In order to solve the above-mentioned problems, the present invention provides an air cooling system for a high-voltage inverter. By adding a flow regulating structure with an automatic regulator above the transformer partition, the cooling air flow of each partition of the power conversion unit partition and the transformer partition in the cooling equipment can be automatically adjusted as needed, and at the same time, the overall flow resistance of the cooling system can be reduced to make the total cooling air flow of the air cooling system adjustable, thereby controlling the outlet temperature rise of the cooling fan and increasing the life of the cooling fan.

[0009] In an air cooling system for a high-voltage inverter according to one embodiment of the present invention, the high-voltage inverter has a power conversion unit partition for accommodating a power conversion unit and a transformer partition for accommodating a transformer arranged in parallel front and back in a cabinet, and a flow regulating structure is installed on the upper part of the transformer partition. The air cooling system includes a power conversion unit partition air duct formed in the power conversion unit partition, a transformer partition air duct formed at the lower part of the transformer partition and connected to the power conversion unit partition air duct, and a common air duct formed at the upper part of the transformer partition and connected to the transformer partition air duct in the flow regulating structure. In the flow regulating structure, an automatic regulator capable of automatically adjusting opening and closing is detachably provided. When the automatic regulator is in a closed state, a first flow path is formed in which cooling air flows out sequentially through the power conversion unit partition air duct, the transformer partition air duct and the common air duct. When the automatic regulator is in an open state, both the first flow path and a second flow path are formed in which cooling air flows out directly through the power conversion unit partition air duct and then directly enters the common air duct.

[0010] The air cooling system of the high-voltage inverter involved in one aspect of the present invention can also be constructed such that when the wind pressure in the cabinet is below a specified pressure value, the automatic regulator is maintained in a closed state, and when the wind pressure in the cabinet exceeds the specified pressure value, the automatic regulator becomes an open state.

[0011] The air cooling system of the high-voltage inverter involved in one aspect of the present invention can also be constructed so that the automatic regulator can freely adjust the opening degree when it is turned on, thereby adjusting the cooling air flow ratio flowing through the transformer partition and the power conversion unit partition.

[0012] The air cooling system of the high-voltage inverter involved in one aspect of the present invention can also be configured as follows: the flow regulating structure is formed as a cubic frame, and at least one automatic regulator is respectively provided on the bottom surface and / or the lower part of the four side surfaces of the flow regulating structure.

[0013] The air cooling system of the high-voltage inverter involved in one embodiment of the present invention can also be constructed as follows, the automatic regulator comprises: a regulator base, which is detachably mounted on the flow regulating structure; an adjustment plate, which is mounted on the regulator base via a rotatable rotating shaft and can be opened and closed by rotating the rotating shaft; a spring, one end of which is fixed to the regulator base; a connecting rod, which is connected between the other end of the spring and the rotating shaft, when the wind pressure in the cabinet is below a specified pressure value, the spring maintains the adjustment plate in a closed state via the connecting rod, and when the wind pressure in the cabinet exceeds the specified pressure value, the adjustment plate applies pressure to the spring via the connecting rod to elastically deform it, and the elastically deformed spring causes the rotating shaft to rotate in a direction to open the adjustment plate via the connecting rod.

[0014] The air cooling system for a high-voltage inverter according to one aspect of the present invention may be configured such that the opening of the regulating plate is adjusted according to the wind pressure in the cabinet, thereby adjusting the opening of the automatic regulator.

[0015] The air cooling system for a high-voltage inverter according to one aspect of the present invention may be configured such that, in one automatic regulator, a plurality of the regulating plates are arranged in parallel in a vertical direction.

[0016] The air cooling system for a high-voltage inverter according to one aspect of the present invention may be configured such that an opening for mounting the regulator base is provided in the flow rate regulating structure.

[0017] The air cooling system of the high-voltage inverter according to one aspect of the present invention may be configured such that the air cooling system includes a cooling fan, and the cooling fan is provided on a cabinet top on a transformer partition side of the cabinet.

[0018] The air cooling system for a high-voltage inverter according to one aspect of the present invention may be configured such that the cabinet includes a door panel that can be opened and closed at the front side of the cabinet and has a plurality of air inlet holes for letting in cooling air.

[0019] Effects of the Invention

[0020] According to the air cooling system of the high-voltage inverter of the present invention, the cooling air flow of each partition of the power conversion unit partition and the transformer partition in the cooling equipment can be automatically adjusted as needed, and at the same time, the overall flow resistance of the cooling system can be reduced to make the total cooling air flow of the air cooling system adjustable, thereby controlling the outlet temperature rise of the cooling fan and increasing the life of the cooling fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a perspective view showing main parts of an air cooling system of a high-voltage inverter according to an embodiment of the present invention.

[0022] Figure 2 This is a diagram showing a cooling air flow path in an air cooling system of a high-voltage inverter according to an embodiment of the present invention.

[0023] Figure 3 The diagram is a schematic diagram showing the positional relationship between transformer partition air ducts and common air ducts in an air cooling system for a high-voltage inverter according to an embodiment of the present invention.

[0024] Figure 4 This is a diagram showing an automatic regulator included in a flow rate regulating structure in an air cooling system of a high-voltage inverter according to an embodiment of the present invention.

[0025] Figure 5 The figure shows the specific structure of the automatic regulator provided in the flow rate adjustment structure in the air cooling system of the high-voltage inverter according to one embodiment of the present invention, and is a figure showing that the automatic regulator is in a closed state.

[0026] Figure 6 The figure shows the specific structure of the automatic regulator provided in the flow rate adjustment structure in the air cooling system of the high-voltage inverter according to one embodiment of the present invention, and is a figure showing that the automatic regulator is in an open state.

[0027] Figure 7 This is a diagram showing a cooling air flow path in an air cooling system of a conventional high-voltage inverter.

[0028] Description of Reference Numerals

[0029] 1…cooling fan; 2…flow regulating structure; 3…transformer partition; 4…power conversion unit partition; 20…common air duct; 30…transformer partition air duct; 40…power conversion unit partition air duct; 5…vertical partition; 6…air filter door plate; L1…first flow path; L2…second flow path; 22, 221, 222…automatic regulator; 2211…regulating plate; 2212…regulator base; 2213…spring; 2214…connecting rod. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings to clearly and completely describe the embodiments of the present invention. Obviously, the described embodiments are only examples, and therefore limit the scope of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] [Implementation Method]

[0032] An air cooling system for a high-voltage inverter according to an embodiment of the present invention will be described with reference to the drawings.

[0033] Figure 1This is a perspective view showing main parts of an air cooling system of a high-voltage inverter according to an embodiment of the present invention. Figure 2 This is a diagram showing a cooling air flow path in an air cooling system of a high-voltage inverter according to an embodiment of the present invention. Figure 3 The figure is a schematic diagram showing the positional relationship between transformer partitions and a common air duct in an air cooling system of a high-voltage inverter according to an embodiment of the present invention. Figure 4 This is a diagram showing an automatic regulator included in a flow rate regulating structure in an air cooling system of a high-voltage inverter according to an embodiment of the present invention.

[0034] The high-voltage inverter includes, for example, a transformer, a power conversion unit, an integrated cabinet for housing the transformer and the plurality of power conversion units, and a cooling fan 1 disposed on the top of the cabinet.

[0035] exist Figure 1 and Figure 2 In the figure, an XYZ orthogonal coordinate system is shown for ease of understanding and explanation, wherein the X direction is the left and right direction of the high-voltage inverter, the Y direction is the front and back direction of the high-voltage inverter (+Y direction is the front), and the Z direction is the up and down direction of the high-voltage inverter (+Z direction is the top).

[0036] Next, the basic structure of the high-voltage inverter is described.

[0037] like Figure 1 As shown, the appearance of the cabinet of the high-voltage inverter is, for example, a box-shaped. A door panel 6 for opening and closing the cabinet body is provided on the front side of the cabinet. A plurality of air inlets (not shown) are formed on the door panel 6 for the entry of cooling air, and an air filter (not shown) is provided for each of the plurality of air inlets. The air filter is, for example, a mesh having a plurality of through holes, and can separate and capture foreign matter such as dust from the air flowing into the interior of the cabinet through the plurality of through holes, so as to ensure the cleanliness of the internal environment of the cabinet. In addition, an exhaust port (not shown) is formed on the top surface of the cabinet for the air (hot air) in the cabinet to be discharged from the cabinet after heat exchange.

[0038] like Figure 1 As shown, the interior of the cabinet is divided into two parallel partitions in front and back by a vertical partition 5, wherein the front partition is a power conversion unit partition 4 for accommodating a power conversion unit, and the rear partition is a transformer partition 3 for accommodating a transformer.

[0039] The power conversion units accommodated in power conversion unit partition 4 contain a large number of thyristor devices, and the temperature sensitivity of their chips is significantly higher than the iron core, coil, diphenyl ether, etc. contained in the transformer accommodated in transformer partition 3. Therefore, when setting the operating parameters of the cooling system, priority is given to power conversion unit partition 4 with higher heat dissipation requirements, so that transformer partition 3 has a certain degree of heat dissipation redundancy.

[0040] In the power conversion unit partition 4, a plurality of power conversion unit mounting frames are arranged in a matrix. Figure 1 In the figure, a case where a plurality of 3×3 power conversion unit mounting frames are formed is shown as an example, but the present invention is not limited to this.

[0041] exist Figure 1 In the example shown, the vertical partition 5 is formed with a plurality of through holes corresponding to the plurality of power module mounting frames, and the plurality of power module mounting frames protrude toward the transformer partition 3 through the corresponding through holes. In addition, the plurality of power module mounting frames are respectively connected to the transformer partition 3, and the power conversion unit partition air duct 40 is formed through the paths through which the plurality of power module mounting frames are respectively connected to the transformer partition 3.

[0042] The transformer is installed in the lower area of ​​transformer partition 3. Figure 1 As shown, the transformer is surrounded by a cylindrical frame, through which a transformer partition air duct 30 is formed. The bottom of the cylindrical frame is open to allow cooling wind from the power conversion unit partition air duct 40 to flow in.

[0043] Furthermore, in the transformer partition 3 , a flow control structure 2 is arranged in the upper region above the transformer partition air duct 30 , and a common air duct 20 is formed by the flow control structure 2 .

[0044] Figure 3 It is a schematic diagram showing the positional relationship between the transformer partition air duct and the common air duct in the air cooling system of a high-voltage inverter according to one embodiment of the present invention, in which only the cylindrical frame forming the transformer partition air duct 30 and the flow regulating structure 2 forming the common air duct 20 are extracted for representation.

[0045] like Figure 3 As shown, the flow regulating structure 2 forming the common air duct 20 is, for example, a cubic frame body with an upper opening. The flow regulating structure 2 is formed such that the upper peripheral edge is tightly sealed with respect to the inner surface of the cabinet top surface in a manner of surrounding the exhaust port formed on the top surface of the cabinet, and the bottom surface is tightly connected with the top surface of the cylindrical frame body forming the transformer partition air duct 30. In addition, the common air duct 20 is connected with the transformer partition air duct 30.

[0046] Thus, the exhaust port on the cabinet top surface is formed at a position opposite to the common air duct 20 , and the cooling fan 1 is installed at a position opposite to the exhaust port. The cooling fan 1 can discharge the hot air in the cabinet from the exhaust port through the common air duct 20 .

[0047] Furthermore, the flow rate regulating structure 2 is provided with an automatic regulator 22 in a detachable manner.

[0048] Figure 4This is a diagram showing an automatic regulator included in a flow rate regulating structure in an air cooling system of a high-voltage inverter according to an embodiment of the present invention.

[0049] Next, refer to Figure 4 The basic structure of the automatic regulator 22 of the present invention will be described.

[0050] like Figure 4 As shown, the flow regulating structure 2 is provided with an opening for installing the automatic regulator 22. Specifically, two openings are provided at positions near the bottom surface of the front and rear sides, one opening is provided at positions near the bottom surface of the left and right sides, and openings are provided at positions adjacent to the openings of the front and rear sides on the bottom surface, a total of 10 openings are provided, and one automatic regulator 22 is detachably installed in each opening, so that 10 automatic regulators 22 are installed.

[0051] exist Figure 1 and Figure 4 In the figure, the automatic regulator provided on the side is marked as automatic regulator 221, and the automatic regulator provided on the bottom is marked as automatic regulator 222, but when there is no need to distinguish between them, they are collectively referred to as automatic regulator 22 in the future.

[0052] The automatic regulator 22 is configured to automatically adjust opening and closing, forming different cooling air flow paths when closed and opened. Figure 2 The cooling air flow path in the air cooling system is specifically shown.

[0053] If the Figure 2 As shown, when the automatic regulator 22 is closed, air enters the power conversion unit partition 4 from the air inlet of the door panel, enters the transformer partition 3 along the power conversion unit partition air duct 40, enters the transformer partition air duct 30 from the bottom opening of the transformer tubular frame in the transformer partition 3, and flows to the exhaust port along the transformer partition air duct 30 and the common air duct 20. Therefore, at this time, a first flow path L1 is formed in the air cooling system, and the cooling air flows out through the power conversion unit partition air duct 40, the transformer partition air duct 30 and the common air duct 20 in sequence. The first flow path L1 is equivalent to Figure 7 The cooling air flow path in the conventional series air duct is shown.

[0054] Furthermore, if the Figure 2As shown, when the dynamic regulator 22 is turned on, since the cooling air can also flow into the common air duct 20 through the regulator 22, the cooling air enters the power conversion unit partition 4 from the air inlet of the door plate and generates two branches, one of which is the first flow path L1 mentioned above, and the other is a new flow path formed by the cooling air directly entering the common air duct 20 from the regulator 22 and flowing to the exhaust port formed on the cabinet top. Therefore, the first flow path L1 and the second flow path L2 in which the cooling air flows out after passing through the power conversion unit partition air duct 40 without passing through the transformer partition air duct 30 and directly entering the common air duct 20 are formed in the air cooling system.

[0055] like Figure 2 As shown, whether it is only the first flow path L1 when the regulator 22 is closed, or the first flow path L1 and the second flow path L2 that exist simultaneously when the regulator 22 is opened, they all flow through the common air duct 20, so it is called "common air duct".

[0056] When the wind pressure (cooling air pressure) in the cabinet is below a predetermined pressure value, the automatic regulator 22 is maintained in a closed state, and when the wind pressure in the cabinet exceeds the predetermined pressure value, the automatic regulator 22 is opened.

[0057] Furthermore, the automatic regulator 22 can freely adjust the opening degree when it is turned on, thereby adjusting the ratio of the cooling air flow rate flowing through the transformer partition 3 and the power conversion unit partition 4. For example, when the opening degree of the automatic regulator 22 is increased, the cooling air flow rate flowing through the power conversion unit partition 4 increases, and the cooling air flow rate flowing through the transformer partition 3 decreases. Furthermore, the automatic regulator 22 can continuously adjust the opening degree, thereby dynamically adjusting the ratio of the cooling air flow rate flowing through the transformer partition 3 and the power conversion unit partition 4.

[0058] Due to the opening of the automatic regulator 22, a second flow path L2 is formed in addition to the first flow path L1, so the overall flow resistance of the cooling device is reduced. As a result, the actual working pressure of the cooling fan 1 will be reduced and the air volume will increase. After the air volume increases, since the overall loss of the high-voltage inverter does not change, the temperature of the air discharged by the cooling fan 1 decreases.

[0059] In addition, after the automatic regulator 22 is turned on, the total air volume of the cooling system increases, and the air volume flowing through the power conversion unit partition 4 also increases accordingly, and the temperature of the power conversion unit in this partition is further reduced. In contrast, the air volume flowing through the transformer partition 3 decreases, and the temperature of the transformer in this partition increases. However, as mentioned above, a certain degree of heat dissipation redundancy is set for the transformer partition 3, so even if the temperature rises, it will not exceed the allowable temperature.

[0060] Figure 5 and Figure 6An example of a specific structure of the automatic regulator 22 is shown. Figure 5 is a diagram showing the automatic regulator 22 in a closed state, Figure 6 is a diagram showing the automatic regulator 22 in an on state. The on state of the automatic regulator 22 can be Figure 5 The fully closed position shown is Figure 6 The maximum opening state shown is adjusted continuously.

[0061] Below, refer to Figure 5 and Figure 6 An example of a specific configuration of the automatic regulator 22 will be described.

[0062] like Figure 5 and Figure 6 As shown, the automatic regulator 22 comprises: a regulator base 2212, which is detachably mounted on the flow regulating structure 2; a plurality of regulating plates 2211 are arranged in parallel along the up and down directions, and are mounted on the regulator base 2212 via a rotatable rotating shaft 2215, and can be opened and closed by rotating the rotating shaft 2215; a spring 2213, one end of which is fixed to the regulator base 2212; and a connecting rod 2214, which is connected between the other end of the spring 2213 and the rotating shaft 2215.

[0063] In addition, the automatic regulator 22 is configured so that when the wind pressure in the cabinet is below a predetermined pressure value, Figure 5 As shown in FIG. 1 , the spring 2213 maintains the adjustment plate 2211 in a closed state via the connecting rod. When the wind pressure in the cabinet exceeds the specified pressure value, as shown in FIG. Figure 6 As shown in the figure, the adjusting plate 2211 applies a pressure (pressure exceeding the elastic deformation threshold of the spring) to the spring 2213 via the connecting rod 2214 to elastically deform the spring 2213, and the elastically deformed spring 2213 rotates the rotating shaft 2215 in the direction of opening the adjusting plate 2211 via the connecting rod 2214. In addition, the adjusting plate 2211 adjusts the opening degree according to the wind pressure in the cabinet, thereby adjusting the opening degree of the automatic regulator 22.

[0064] In the present invention, the automatic regulator 22 is the core component of the high-voltage inverter air cooling system, and the automatic regulator 22 is controlled by the adjustment plate 2211 to control the opening and closing and the opening degree. The adjustment plate 2211 is based on the combination of fluid mechanics and mechanical structure, and controls the flow path and flow rate of the cooling air through opening and closing actions.

[0065] Next, the adjustment plate 2211 of the automatic adjuster 22 will be described in more detail.

[0066] <Basic principle of adjustment plate>

[0067] The main principle of the regulating plate 2211 is to control the passing area of ​​the cooling air by changing its opening, thereby adjusting the passing path (flow path) and flow rate of the cooling air. In addition, the opening of the regulating plate 2211 can be dynamically adjusted to meet different heat dissipation requirements.

[0068] <Installation of the adjustment plate>

[0069] As described above, the adjustment plate 2211 is mounted on the regulator base 2212 via the rotatable rotation shaft 2215. As the rotation shaft 2215 rotates, the adjustment plate 2211 performs an opening and closing action by changing the inclination angle formed relative to the regulator base 2212, thereby controlling the passage path of the cooling air. The adjustment plate 2211 can achieve flexible opening and closing actions under the cooperation of the spring 2213 and the connecting rod 2213.

[0070] <Spring specifications>

[0071] The specifications of spring 2213 can be designed with reference to the following formula.

[0072] Assuming a desired cooling fan life, according to the desired cooling fan life, refer to the fan temperature life curve to find out the fan outlet temperature T1. Then, according to the following formula 1, the total system air volume Q is calculated. Here, the fan temperature life curve is a curve used to describe the change of the fan service life under different temperature conditions. For example, the fan temperature life curve drawn based on the Arrhenius model can be used.

[0073] P=ρ·Cp·Q·σ·(T1-T a )…(Formula 1)

[0074] in:

[0075] P: Total heat that the cooling system needs to handle (W)

[0076] ρ: Density of air (kg / m3)

[0077] Cp: ​​Specific heat capacity of air (J / (kg·K))

[0078] Q: Total air volume (m3 / s)

[0079] σ: heat transfer efficiency

[0080] T1: Cooling fan outlet temperature (℃)

[0081] T a :Ambient temperature(℃)

[0082] Next, use the total system air volume Q to calculate the air volume Q1 of a single cooling fan according to the number of cooling fans, and check the fan PQ curve to get the actual working pressure point (working point) P1 of the cooling fan. Here, the fan PQ curve is a curve that reflects the relationship between the air volume (Q) and static pressure (P) of the fan under different working conditions. In actual use, the working point of the fan is a point on the curve, which represents the corresponding air volume under a specific static pressure.

[0083] Furthermore, using the pressure point P1 obtained above, the pressure P2 on the adjustment plate 2211 can be approximately calculated. Based on the pressure value P2 and the total area S1 of the plurality of adjustment plates 2211, the force F2 on the spring 2211 can be calculated. For example, if the total area of ​​the plurality of adjustment plates 2211 in the automatic regulator 22 is set to S1 and the elastic deformation threshold of the spring 2213 is set to be less than F2, the total amount of heat that can actually be handled by the cooling system must be greater than P calculated according to Formula 1, and the actual life of the cooling fan becomes longer than the desired cooling fan life.

[0084] Thus, the spring 2213 in the automatic regulator 22 can be appropriately selected according to the desired cooling fan life and the area size of the regulator plate.

[0085] <Opening and closing control of the adjustment plate>

[0086] The opening and closing action of the adjustment plate 2211 is controlled by the wind pressure in the cabinet and the elastic force of the spring 2213. The specific process is as follows:

[0087] (1) Closed state

[0088] Initial condition: When the high-voltage inverter and the air cooling system are not working, the air pressure in the cabinet is low and insufficient to cause elastic deformation of the spring 2213. At this time, the adjustment plate 2211 is in the closed state ( Figure 5 ).

[0089] Action process: The spring 2213 is in a natural state, and the adjustment plate 2211 is maintained in a closed position through the connecting rod 2213. The adjustment plate 2211 completely closes the common air duct 20, and the cooling air can only flow along the first flow path L1, that is, the cooling air passes through the power conversion unit partition air duct 40, the transformer partition air duct 30 and the common air duct 20 in sequence, and is finally discharged by the cooling fan 1.

[0090] (2) Open state

[0091] Triggering condition: After the high-voltage inverter and the air cooling system start working, the wind pressure in the cabinet gradually increases, and the pressure transmitted to the spring 2213 also increases. When the transmitted pressure exceeds the elastic deformation threshold of the spring 2213, the spring 2213 begins to be stretched.

[0092] Action process: The pressure exerted by the cooling wind on the adjustment plate 2211 is transmitted to the spring 2213 through the connecting rod 2213, causing the spring 2213 to undergo elastic deformation. Furthermore, the tensile force of the spring 2213 is transmitted to the rotating shaft 2215 of the adjustment plate 2211 through the connecting rod 2213, causing the adjustment plate 2211 to rotate around the rotating shaft 2215, and the adjustment plate 2211 becomes open ( Figure 6 ) and open the common air duct 20. At this time, the cooling air flows along the second flow path L2 in addition to the first flow path L1, so that the cooling air flows through the first flow path L1 and the second flow path L2 at the same time and is finally discharged by the cooling fan 1.

[0093] <Adjustment of the opening of the adjustment plate>

[0094] The opening of the adjustment plate 2211 is proportional to the wind pressure in the cabinet. The greater the wind pressure, the greater the opening of the adjustment plate 2211; the smaller the wind pressure, the smaller the opening of the adjustment plate 2211. When the wind pressure in the cabinet changes, the adjustment plate 2211 automatically adjusts the opening through the mechanical structure of the spring 2213 and the connecting rod 2213 according to the wind pressure in the cabinet, thereby changing the passing area of ​​the cooling air.

[0095] For example, if you want to increase the cooling air flow in the cabinet and increase the opening of the adjustment plate 2211, you can consider increasing the speed of the cooling fan to increase the wind pressure (wind pressure), thereby increasing the rotation angle of the adjustment plate 2211, that is, the opening. For example, a thermal sensor is installed at a specified position of the power conversion unit partition 4 that has a high requirement for heat dissipation. When the temperature detected by the thermal sensor exceeds a certain threshold, the cooling fan is controlled to increase the speed. Although increasing the speed of the cooling fan may shorten its life, when it is urgent to enhance the cooling effect of the power conversion unit partition 4, the cooling air flow in the cabinet can be given priority and the speed can be increased.

[0096] <Function of the adjustment plate>

[0097] The following overall flow regulation and zoned flow distribution can be achieved through the adjustment plate 2211.

[0098] Overall flow regulation: When the regulating plate 2211 is opened, the portion flowing along the second flow path L2 is increased compared to when it is closed, thereby reducing the overall flow resistance of the cooling system and increasing the total cooling air flow of the cooling system.

[0099] Partition flow distribution: By adjusting the opening of the adjustment plate 2211, the cooling air flow flowing through the power conversion unit partition 4 and the transformer partition 3 can be dynamically distributed. When the adjustment plate is partially or fully opened, part of the cooling air is directly discharged through the common air duct 20, thereby increasing the cooling air flow through the power conversion unit partition 4 and reducing the cooling air flow through the transformer partition 3. The cooling air volume allocated to the transformer partition 3 and the power conversion unit partition 4 can be adjusted, and different cooling effects can be achieved for different partitions such as the transformer partition 3 and the power conversion unit partition 4, and differentiated control can be performed according to each partition.

[0100] [Modifications]

[0101] Figure 4 The example in which 10 openings are formed in the flow control structure 2 and 10 automatic regulators 22 are installed is shown. However, the number and positions of the openings in the flow control structure 2 and the number and positions of the automatic regulators 22 are not limited to Figure 4 The situation shown can be appropriately set according to needs. For example, it is also possible to install the automatic regulator 221 only on the side surface, and not install the automatic regulator 222 on the bottom surface. In addition, instead of installing two automatic regulator 22 openings on the front and rear sides, one automatic regulator 22 can be installed on each side, so that the one automatic regulator 22 is formed into a more elongated strip shape.

[0102] In addition, the respective automatic regulators 22 may have the same configuration or different configurations, but the same configuration is preferred because the number of types of components can be reduced.

[0103] Figure 5 and Figure 6 The automatic regulator 221 is shown as having a spring and a connecting rod, but the present invention is not limited to any other method as long as it can open and close the regulating plate based on the combination of fluid mechanics and mechanical structure. Figure 5 and Figure 6 Specific examples shown.

[0104] In addition, the present invention installs an automatic regulator 22 at the opening of the flow regulating structure 2, and a sealing plate for closing the opening can also be installed at the opening. When the sealing plate is installed, the air cooling system of the high-voltage inverter can also be used as a traditional series air duct air cooling system.

[0105] [Effect]

[0106] The air cooling system of the high-voltage inverter of the present invention can achieve the following effects.

[0107] According to the air cooling system of the high-voltage frequency converter of the present invention, by opening the automatic regulator, in the air cooling system, in addition to the first flow path in which the cooling air flows out through the power conversion unit partition air duct, the transformer partition air duct and the common air duct in sequence, a second flow path is formed in which the cooling air flows out directly into the common air duct after passing through the power conversion unit partition air duct. In this way, the overall flow resistance of the cooling system can be reduced, the overall cooling air flow of the cooling system can be increased, and the exhaust temperature of the cooling fan can be reduced. Since the life of the cooling fan is mainly inversely proportional to the operating temperature of its bearing grease, and the operating temperature of the bearing grease will be significantly reduced when the exhaust temperature is reduced, the life of the cooling fan can be extended.

[0108] In addition, a second flow path is formed as a new flow path by opening the automatic regulator, so that the completely series air duct when the automatic regulator is closed is destroyed, so that the cooling air flow in the power conversion unit partition and the transformer partition is no longer the same, and the cooling air flow flowing through the power conversion unit partition increases while the cooling air flow flowing through the transformer partition decreases. Therefore, the cooling air flow can be adjusted according to each partition of the power conversion unit partition and the transformer partition, and the partition flow distribution can be performed, so that different cooling effects can be controlled for each partition as needed. This means that even if the heat dissipation demand of a certain partition changes, the heat dissipation effect can be optimized by adjusting the cooling air flow. Therefore, according to the heat dissipation demand of different partitions, the cooling air flow is automatically adjusted so that the devices in each partition work within a more reasonable temperature range, which can improve the overall performance and reliability of the equipment.

[0109] According to the air cooling system of the high-voltage inverter of the present invention, the power conversion unit partition usually contains a large number of thyristor devices, which are highly sensitive to temperature and require more cooling air to maintain within a reasonable temperature range. However, in the previous series air duct structure, the cooling air first passes through the power conversion unit partition, and the heated air then flows through the transformer partition, resulting in poor heat dissipation effect of the transformer partition. In the past, transformer partitions were usually designed with a large heat dissipation redundancy to ensure that the heat dissipation requirements can be met even during high-load operation. However, this design will lead to a waste of cooling air flow and increase energy consumption during normal operation. In contrast, in the present invention, by having a regulator, by turning on the regulator, the cooling air volume flowing through the power conversion unit partition can be increased and the cooling air volume flowing through the transformer partition can be reduced. Therefore, the transformer partition only needs to be provided with less heat dissipation redundancy than before, which can increase the operating efficiency of the cooling fan.

[0110] According to the air cooling system of the high-voltage inverter of the present invention, the opening and closing of the regulator and the opening degree can be adjusted dynamically. Through the adjustment, the cooling air flow path in the cooling system and the flow distribution to each cooling air flow path are dynamically adjustable, so that dynamic adjustment can be performed according to different operating conditions. Therefore, under different working conditions, the cooling system can optimize its performance to adapt to different heat dissipation requirements.

[0111] According to the above-mentioned air cooling system of the high-voltage inverter, by arranging the required number of automatic regulators at different positions such as the bottom surface of the flow regulating structure and the lower part of the four side surfaces, the number and positions of the automatic regulators can be set according to the actual working conditions, thereby improving the heat dissipation performance of the air cooling system.

[0112] According to the air cooling system of the above-mentioned high-voltage inverter, the adjustment plate can realize flexible opening and closing actions under the cooperation of the spring and the connecting rod, and can automatically control the flow path and flow rate of the cooling air through opening and closing actions based on the combination of fluid mechanics and mechanical structure.

[0113] According to the air cooling system of the high-voltage frequency converter, when the automatic regulator needs to be replaced, it can be easily disassembled at the opening, which is convenient for repair and maintenance.

[0114] According to the air cooling system of the high-voltage frequency converter of the present invention, it is only necessary to add the flow regulating structure provided with the regulator to the existing air cooling system, without the need for large-scale redesign and equipment transformation.

[0115] The above describes an air cooling system for a high-voltage inverter according to an embodiment of the present invention, but the embodiment is presented as an example and is not intended to limit the scope of the invention. The embodiment can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the subject matter of the invention. These embodiments and their variations are included in the scope or subject matter of the invention, and are also included in the invention described in the claims and the scope of their equivalents.

Claims

1. An air cooling system for a high voltage frequency converter, characterized in that: The high-voltage frequency converter has a power conversion unit partition (4) for accommodating a power conversion unit and a transformer partition (3) for accommodating a transformer formed in parallel in the cabinet. A flow regulating structure (2) is installed on the upper part of the transformer partition (3). The air cooling system comprises a power conversion unit partition air duct (40) formed in the power conversion unit partition, a transformer partition air duct (30) formed at the lower part of the transformer partition and communicating with the power conversion unit partition air duct, and a common air duct (20) formed at the flow regulating structure and at the upper part of the transformer partition and communicating with the transformer partition air duct, The flow regulating structure (2) is provided with an automatic regulator (22) capable of automatically regulating opening and closing in a detachable manner. When the automatic regulator is in a closed state, a first flow path (L1) is formed in which cooling air flows out through the power conversion unit partition air duct, the transformer partition air duct and the common air duct in sequence. When the automatic regulator is in an on state, the first flow path (L1) and the second flow path (L2) are formed, in which the cooling air passes through the power conversion unit partition air ducts in sequence and then directly enters the common air duct and flows out.

2. The air cooling system of the high voltage inverter according to claim 1, characterized in that: When the wind pressure in the cabinet is below a predetermined pressure value, the automatic regulator is maintained in a closed state. When the wind pressure in the cabinet exceeds a predetermined pressure value, the automatic regulator becomes open.

3. The air cooling system of the high voltage inverter according to claim 1, characterized in that: The automatic regulator can freely adjust the opening degree when it is turned on, so as to adjust the ratio of the cooling air flow flowing through the transformer partition and the power conversion unit partition.

4. The air cooling system of the high voltage inverter according to claim 1, characterized in that: The flow regulating structure is formed as a cubic frame. At least one automatic regulator is respectively arranged on the bottom surface and / or the lower part of the four side surfaces of the flow regulating structure.

5. The air cooling system for a high voltage frequency converter according to any one of claims 1 to 4, characterized in that: The automatic regulator has: A regulator base (2212) is detachably mounted on the flow regulating structure; An adjustment plate (2211) is mounted on the regulator base via a rotatable rotation shaft (2215) and can be opened and closed by rotating the rotation shaft; A spring (2213), one end of which is fixed to the regulator base; A connecting rod (2214) is connected between the other end of the spring and the rotating shaft. When the wind pressure in the cabinet is below a predetermined pressure value, the spring maintains the adjustment plate in a closed state via the connecting rod. When the wind pressure in the cabinet exceeds a specified pressure value, the adjustment plate applies pressure to the spring via the connecting rod to elastically deform it, and the elastically deformed spring rotates the rotating axis via the connecting rod in a direction to open the adjustment plate.

6. The air cooling system of the high voltage inverter according to claim 5, characterized in that: The adjustment plate adjusts the opening degree in accordance with the wind pressure in the cabinet, thereby adjusting the opening degree of the automatic regulator.

7. The air cooling system for a high voltage frequency converter according to claim 5, characterized in that: In one of the automatic adjusters, a plurality of the adjustment plates are arranged in parallel in the vertical direction.

8. The air cooling system for a high voltage frequency converter according to claim 5, characterized in that: The flow regulating structure is provided with an opening for installing the regulator base.

9. The air cooling system for a high voltage frequency converter according to claim 1, characterized in that: The air cooling system includes a cooling fan, and the cooling fan is arranged on the cabinet top on the transformer partition side of the cabinet.

10. The air cooling system of the high voltage inverter according to claim 1, characterized in that: The cabinet includes a door panel that can be opened and closed at the front side of the cabinet and has a plurality of air inlet holes for cooling air to enter.

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