Air cooling system of high-voltage frequency converter

Abstract

The utility model 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 side by side front and back in a cabinet, 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 utility model relates to the air cooling system of high voltage frequency converter, especially the air cooling system of high voltage frequency converter can automatically adjust each subarea cooling air flow. BACKGROUND

[0002] With the continuous development of power electronics technology and microelectronic technology, high voltage frequency converter is evolving towards higher power density, smaller size. This not only requires the performance of the equipment to be improved, but also puts forward higher requirements for the cooling system. The air cooling system of the integrated high voltage frequency converter with higher power density on the market is all in series air duct structure (referring to Figure 7 ).

[0003] In the case of this series air duct structure, as shown in Figure 1 , the cooling air enters from the air filter door plate, is heated by the power conversion unit partition located at the front side, and is further heated by the transformer partition located at the rear side, and finally becomes hot air and is discharged by the cooling fan. Since the vertical partition is provided between the power conversion unit partition and the transformer partition, the vertical partition seals and separates the front and rear two partitions, so that the cooling air flow of the two partitions is equal.

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

[0005] 1. The flow resistance of the series air duct structure as a whole is fixed, and 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 that the service life of the cooling fan 1 cannot be adjusted, and the fan life cannot be prolonged by reducing the exhaust temperature.

[0006] 2. When the cooling demand of the power conversion unit partition and the transformer partition changes, the cooling air flow of each partition of the equipment cannot be automatically adjusted as needed, and different cooling effect control cannot be performed on each partition.

[0007] 3. The design of the series air duct structure is fixed and cannot be adjusted, and it cannot be dynamically adjusted 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. INVENTION CONTENTS

[0008] In order to solve the above problems, the utility model provides a high pressure frequency converter's air -cooled system, through increasing the flow regulation structure with automatic regulator in the transformer partition top, can make cooling equipment power conversion unit partition and the cooling wind flow of each partition of transformer partition automatic regulation as needed, can also make the flow resistance of cooling system whole reduces and makes the total flow of air -cooled system cooling wind adjustable, further can control the outlet temperature rise of cooling fan and improves the life of cooling fan.

[0009] In the air-cooled system of the high voltage frequency converter of the utility model, the power conversion unit partition and the transformer partition are formed in the cabinet, the flow regulation structure is installed on the upper part of the transformer partition, the air-cooled system comprises the power conversion unit partition air duct formed in the power conversion unit partition, the transformer partition air duct formed in the lower part of the transformer partition and communicated with the power conversion unit partition air duct, and the common air duct formed in the flow regulation structure and communicated with the transformer partition air duct and being the upper part of the transformer partition, the automatic regulator capable of automatically adjusting opening and closing is arranged in the flow regulation structure in a detachable manner, when the automatic regulator is in the closed state, the first flow path is formed, when the automatic regulator is in the open state, the first flow path and the second flow path are formed.

[0010] The air-cooled system of the high voltage frequency converter of the utility model can also be constructed, when the air pressure in the cabinet is below the specified pressure value, the automatic regulator is maintained in the closed state, when the air pressure in the cabinet exceeds the specified pressure value, the automatic regulator becomes the open state.

[0011] The air-cooled system of the high voltage frequency converter of the utility model can also be constructed, the automatic regulator can freely adjust the opening degree when opening, so as to adjust the cooling air flow ratio through the first transformer partition and the power conversion unit partition.

[0012] The air-cooled system of the high voltage frequency converter of the utility model can also be constructed, the flow regulation structure is formed into a cubic frame, at least one automatic regulator is arranged on the bottom surface and / or the lower part of the four side surfaces of the flow regulation structure.

[0013] The air cooling system of the high-voltage frequency converter according to one mode of the utility model can also be configured, the automatic adjusting device is provided with: an adjusting device base body, which is detachably installed on the flow adjusting structure; an adjusting plate, which is installed on the adjusting device base body via a rotatable rotating shaft and can be opened and closed by rotating the rotating shaft; a spring, one end of which is fixed on the adjusting device base body; and a connecting rod, which is connected between the other end of the spring and the rotating shaft, when the air pressure in the cabinet is below a specified pressure value, the spring maintains the adjusting plate in a closed state via the connecting rod, when the air pressure in the cabinet exceeds the specified pressure value, the adjusting plate exerts a pressure on the spring via the connecting rod to make the spring elastically deform, and the elastically deformed spring rotates the rotating shaft to an opening direction of the adjusting plate via the connecting rod.

[0014] The air cooling system of the high-voltage frequency converter according to one mode of the utility model can also be configured, the adjusting plate adjusts the opening degree according to the air pressure in the cabinet, so as to adjust the opening degree of the automatic adjusting device.

[0015] The air cooling system of the high-voltage frequency converter according to one mode of the utility model can also be configured, in one automatic adjusting device, a plurality of adjusting plates are arranged in an up-down direction and are arranged in parallel.

[0016] The air cooling system of the high-voltage frequency converter according to one mode of the utility model can also be configured, an opening for installing the adjusting device base body is arranged on the flow adjusting structure.

[0017] The air cooling system of the high-voltage frequency converter according to one mode of the utility model can also be configured, the air cooling system is provided with a cooling fan, and the cooling fan is arranged on the cabinet top of the transformer partition side of the cabinet.

[0018] The air cooling system of the high-voltage frequency converter according to one mode of the utility model can also be configured, the cabinet is provided with a door plate which can open and close the front side of the cabinet and is formed with a plurality of air inlet holes for air entering for cooling.

[0019] Practical effect

[0020] According to the air cooling system of the high-voltage frequency converter, 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 required, the flow resistance of the cooling system as a whole can be reduced, the total cooling air flow of the air cooling system can be adjusted, and the outlet temperature rise of the cooling fan can be controlled, so that the service life of the cooling fan is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a perspective view of main components of the air cooling system of the high-voltage frequency converter according to one embodiment of the utility model.

[0022] Figure 2 Fig. 1 is a diagram showing a cooling air flow path in a forced air cooling system of a high-voltage frequency converter according to an embodiment of the present application.

[0023] Figure 3 Fig. 2 is a diagram showing the positional relationship between a transformer partition air duct and a common air duct in the forced air cooling system of the high-voltage frequency converter according to the embodiment of the present application.

[0024] Figure 4 Fig. 3 is a diagram showing an automatic regulator provided in a flow rate regulating configuration in the forced air cooling system of the high-voltage frequency converter according to the embodiment of the present application.

[0025] Figure 5 Fig. 4 is a diagram showing the detailed configuration of the automatic regulator provided in the flow rate regulating configuration in the forced air cooling system of the high-voltage frequency converter according to the embodiment of the present application, and is a diagram showing the automatic regulator in a closed state.

[0026] Figure 6 Fig. 5 is a diagram showing the detailed configuration of the automatic regulator provided in the flow rate regulating configuration in the forced air cooling system of the high-voltage frequency converter according to the embodiment of the present application, and is a diagram showing the automatic regulator in an open state.

[0027] Figure 7 Fig. 6 is a diagram showing a cooling air flow path in a forced air cooling system of a conventional high-voltage frequency converter.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 1... cooling fan; 2... flow rate regulating configuration; 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; 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 embodiments of the present application will be described below in detail with reference to the accompanying drawings. Obviously, the described embodiments are only examples and thus do not limit the scope of the present application. Based on the embodiments of the present application, any other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0031] [EMBODIMENT]

[0032] A forced air cooling system of a high-voltage frequency converter according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0033] Figure 1 is a perspective view showing main components of the air cooling system of the high voltage frequency converter of an embodiment of the present application. Figure 2 is a view showing a cooling air flow path in the air cooling system of the high voltage frequency converter of an embodiment of the present application. Figure 3 is a schematic view showing positional relationship between the transformer partition and the common air duct in the air cooling system of the high voltage frequency converter of an embodiment of the present application. Figure 4 is a view showing an automatic regulator provided in the flow rate adjusting configuration in the air cooling system of the high voltage frequency converter of an embodiment of the present application.

[0034] The high voltage frequency converter includes, for example, a transformer, a power conversion unit, an integrated cabinet that houses the transformer and the plurality of power conversion units, and a cooling fan 1 provided at a cabinet top of the cabinet.

[0035] In Figure 1 and Figure 2 , an XYZ orthogonal coordinate system is shown for the purpose of understanding and explanation, in which the X direction is the left-right direction of the high voltage frequency converter, the Y direction is the front-rear direction of the high voltage frequency converter (+Y direction is the front direction), and the Z direction is the up-down direction of the high voltage frequency converter (+Z direction is the upward direction).

[0036] Next, the basic configuration of the high voltage frequency converter will be described.

[0037] As shown in Figure 1 , the cabinet of the high voltage frequency converter has, for example, a box shape. A door panel 6 that opens and closes the cabinet body is provided at the front side of the cabinet. A plurality of air inlet holes (not shown) for the entry of cooling air are formed in the door panel 6, and an air filter (not shown) is provided for each of the plurality of air inlet holes. The air filter is, for example, a mesh shape having a plurality of through-holes, and is capable of separating and capturing foreign matter such as dust from air flowing into the inside of the cabinet through the plurality of through-holes, to ensure the cleanliness of the inside of the cabinet. Further, an air outlet (not shown) for discharging air (hot air) that has been heat-exchanged in the cabinet from the cabinet is formed at the top surface of the cabinet.

[0038] As shown in Figure 1 , the inside of the cabinet is divided into two partitions in parallel with each other by a vertical partition 5, in which the front partition is a power conversion unit partition 4 for housing the power conversion unit, and the rear partition is a transformer partition 3 for housing the transformer.

[0039] The power conversion unit in partition 4 contains a large number of thyristor devices. The temperature sensitivity of its chips is significantly higher than that of the transformer in partition 3, which contains iron cores, coils, diphenyl ethers, etc. Therefore, when setting the operating parameters of the cooling system, the power conversion unit in partition 4, which has higher heat dissipation requirements, should be given priority, so that the transformer in partition 3 has a certain degree of heat dissipation redundancy.

[0040] In power conversion unit partition 4, multiple power conversion unit mounting frames are arranged in a matrix. Figure 1 The example shown is a case with a mounting frame containing 3×3 power conversion units, but it is not limited to this.

[0041] exist Figure 1 In the example shown, the vertical partition 5 has multiple through holes corresponding to multiple power module mounting frames, and the multiple power module mounting frames protrude towards the transformer partition 3 through their respective through holes. Furthermore, the multiple power module mounting frames are connected to the transformer partition 3, and the paths connecting the multiple power module mounting frames to the transformer partition 3 form the power conversion unit partition air duct 40.

[0042] A transformer is installed in the lower part of transformer section 3. For example... 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 air from the power conversion unit partition air duct 40 to flow in.

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

[0044] Figure 3 This is a schematic diagram showing the positional relationship between the transformer partition air duct and the common air duct in the air-cooled system of a high-voltage frequency converter according to one embodiment of the present invention. Only the cylindrical frame forming the transformer partition air duct 30 and the flow regulation structure 2 forming the common air duct 20 are shown.

[0045] like Figure 3 As shown, the flow regulation structure 2 forming the common air duct 20 is, for example, a cubic frame with an open top. The flow regulation structure 2 is configured such that its upper periphery is sealed against the inner surface of the top surface of the cabinet by surrounding the exhaust vent formed on the top surface of the cabinet, and its bottom surface is sealed to the top surface of the cylindrical frame forming the transformer partition air duct 30. Furthermore, the common air duct 20 is connected to the transformer partition air duct 30.

[0046] Thus, the exhaust port of 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, and the cooling fan 1 can exhaust the hot air in the cabinet from the exhaust port via the common air duct 20.

[0047] Further, the flow regulating structure 2 is provided with the automatic regulators 22 in a detachable manner.

[0048] Figure 4 is a view showing an automatic regulator provided in a flow regulating structure in a forced air cooling system of a high-voltage frequency converter according to an embodiment of the present application.

[0049] Next, referring to Figure 4 The basic configuration of the automatic regulator 22 of the present application will be described.

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

[0051] In Figure 1 and Figure 4 , the automatic regulator provided on the side surface is marked as automatic regulator 221, and the automatic regulator provided on the bottom surface is marked as automatic regulator 222, but when no distinction is needed hereinafter, they are collectively referred to as automatic regulator 22.

[0052] The automatic regulator 22 is configured to automatically regulate the opening and closing, and different cooling air flow paths are formed when the automatic regulator 22 is closed and opened, Figure 2 Specifically, the cooling air flow path in the forced air cooling system is shown.

[0053] As shown in this Figure 2 , when the automatic regulator 22 is closed, air enters the power conversion unit partition 4 from the air inlet hole of the door plate, 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 cylindrical frame of the transformer in the transformer partition 3, and flows along the transformer partition air duct 30 and the common air duct 20 to the exhaust port, so that at this time, a first flow path L1 in which cooling air flows out in sequence via the power conversion unit partition air duct 40, the transformer partition air duct 30 and the common air duct 20 is formed in the forced air cooling system, and this first flow path L1 corresponds to the cooling air flow path in the previous series air duct as shown in Figure 7 .

[0054] Further, as shown in this Figure 2As shown, when the automatic regulator 22 is opened, since the cooling air can also flow into the common air duct 20 via the regulator 22, after the cooling air enters the power conversion unit partition 4 from the air inlet hole of the door panel, two branches are formed, one branch is the first flow path L1 described above, and the other branch 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 at the top of the cabinet. Therefore, in the air cooling system, the first flow path L1 and the second flow path L2 formed by the cooling air flowing out of the common air duct 20 after passing through the power conversion unit partition air duct 40 without passing through the transformer partition air duct 30 are formed at the same time.

[0055] As shown in FIG. 1, the air cooling system comprises a cabinet 2, a cooling fan 1, a power conversion unit partition 4, a transformer partition 3, and an automatic regulator 22. Figure 2 As shown, whether it is only the first flow path L1 when the automatic regulator 22 is closed, or the first flow path L1 and the second flow path L2 exist at the same time when the automatic regulator 22 is opened, they all flow through the common air duct 20, so it is called "common air duct".

[0056] When the air pressure (cooling air pressure) in the cabinet is below a specified pressure value, the automatic regulator 22 is maintained in a closed state, and when the air pressure in the cabinet exceeds the specified pressure value, the automatic regulator 22 becomes an open state.

[0057] In addition, the automatic regulator 22 can freely adjust the opening degree when it is opened, thereby adjusting the proportion of the cooling air flow through the transformer partition 3 and the power conversion unit partition 4. For example, in the case of increasing the opening degree of the automatic regulator 22, the cooling air flow through the power conversion unit partition 4 increases, and the cooling air flow through the transformer partition 3 decreases. Moreover, the automatic regulator 22 can continuously adjust the opening degree, thereby dynamically adjusting the proportion of the cooling air flow through the transformer partition 3 and the power conversion unit partition 4.

[0058] Due to the opening of the automatic regulator 22, the second flow path L2 is formed in addition to the first flow path L1, so the flow resistance of the cooling equipment as a whole is reduced. Therefore, 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 frequency converter does not change, the air temperature discharged by the cooling fan 1 decreases.

[0059] In addition, after the automatic regulator 22 is opened, 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 further decreases. In contrast, the air volume flowing through the transformer partition 3 decreases, and the temperature of the transformer in this partition increases. However, as described above, a certain degree of heat dissipation redundancy is provided for the transformer partition 3, so even if the temperature increases, it will not exceed the allowable temperature.

[0060] Figure 5 and Figure 6An example of the specific configuration of the automatic regulator 22 is shown. Figure 5 This is a diagram showing the automatic regulator 22 in the off state. Figure 6 This diagram shows the automatic regulator 22 in the "on" state. The "on" state of the automatic regulator 22 can be determined from... Figure 5 The fully closed state shown Figure 6 The maximum open state shown is continuously adjusted.

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

[0062] like Figure 5 and Figure 6 As shown, the automatic regulator 22 includes: a regulator base 2212, which is detachably mounted on the flow regulating structure 2; multiple regulating plates 2211 arranged in parallel along the vertical direction, which 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 connects the other end of the spring 2213 to the rotating shaft 2215.

[0063] Furthermore, the automatic regulator 22 is configured to, when the air pressure inside the cabinet is below a specified pressure value, such as Figure 5 As shown, spring 2213 maintains the adjusting plate 2211 in the closed state via a linkage. When the air pressure inside the cabinet exceeds the specified pressure value, such as Figure 6 As shown, the adjusting plate 2211 applies pressure (exceeding the spring's elastic deformation threshold) to the spring 2213 via the connecting rod 2214, causing the spring 2213 to elastically deform. The elastically deformed spring 2213 then rotates the rotating shaft 2215 in the direction that opens the adjusting plate 2211 via the connecting rod 2214. Furthermore, the opening of the adjusting plate 2211 is adjusted in accordance with the air pressure inside the cabinet, thereby adjusting the opening of the automatic regulator 22.

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

[0065] The adjustment plate 2211 of the automatic regulator 22 will be described in more detail below.

[0066] <Basic Principles of Adjustment Plates>

[0067] The main principle of the adjusting plate 2211 is to control the passing area of the cooling air by changing its opening degree, so as to adjust the passing path (flow path) and flow rate of the cooling air. Moreover, the opening degree of the adjusting plate 2211 can be dynamically adjusted to adapt to different heat dissipation requirements.

[0068] <Installation of the adjusting plate>

[0069] As described above, the adjusting plate 2211 is installed on the adjuster base body 2212 through the rotatable rotating shaft 2215. With the rotating of the rotating shaft 2215, the adjusting plate 2211 performs the opening and closing action in a way of changing the inclination angle relative to the adjuster base body 2212, so as to control the passing path of the cooling air. The adjusting plate 2211 can realize flexible opening and closing action under the cooperation of the spring 2213 and the connecting rod 2213.

[0070] <Specification of the spring>

[0071] The specification of the spring 2213 can be designed by referring to the following formula.

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

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

[0074] Wherein:

[0075] P: total heat to be handled by the cooling system (W)

[0076] p: 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 exchange efficiency

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

[0081] T a : ambient temperature (℃)

[0082] Then, using the total air volume Q of the system, the air volume Q1 of a single cooling fan is calculated according to the number of cooling fans, and the pressure point (working point) P1 at which the cooling fan actually works is obtained by checking the fan P-Q curve. Here, the fan P-Q curve is a curve reflecting the relationship between the air volume (Q) and the static pressure (P) of the fan under different working conditions. In actual use, the working point of the fan is a certain point on the curve, indicating the corresponding air volume under a certain static pressure.

[0083] Further, using the pressure point P1 obtained above, the pressure P2 borne by the adjusting plate 2211 can be approximately calculated. According to the pressure value P2 and the total area S1 of the plurality of adjusting plates 2211, the force F2 borne by the spring 2211 can be calculated. For example, if the plurality of adjusting plates 2211 in the automatic regulator 22 are set to have a total area S1 and the elastic deformation threshold of the spring 2213 is below F2, the total heat that the cooling system can actually handle must be greater than P calculated according to Formula 1, and the actual service life of the cooling fan becomes greater than the desired cooling fan service life.

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

[0085] <Opening and closing control of adjusting plate>

[0086] The opening and closing action of the adjusting plate 2211 is jointly controlled by the air 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 frequency converter and the air cooling system have not started working, the air pressure in the cabinet is low and is not sufficient to cause the spring 2213 to elastically deform, at which time the adjusting plate 2211 is in a closed state. Figure 5

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

[0090] (2) Open state

[0091] Triggering condition: After the high-voltage frequency converter and the air cooling system start working, the air 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 applied by the cooling air to the adjusting plate 2211 is transmitted to the spring 2213 through the connecting rod 2213, causing the spring 2213 to undergo elastic deformation. Subsequently, the tensile force of the spring 2213 is transmitted to the rotation shaft 2215 of the adjusting plate 2211 through the connecting rod 2213, causing the adjusting plate 2211 to rotate around the rotation shaft 2215, thus opening the adjusting plate 2211. Figure 6 The common air duct 20 is opened. At this time, the cooling air flows not only along the first flow path L1 but also along the second flow path L2. Thus, the cooling air flows through both the first flow path L1 and the second flow path L2 simultaneously and is finally discharged by the cooling fan 1.

[0093] <Adjusting the opening of the control panel>

[0094] The opening degree of the regulating plate 2211 is directly proportional to the air pressure inside the cabinet. The higher the air pressure, the larger the opening degree of the regulating plate 2211; the lower the air pressure, the smaller the opening degree of the regulating plate 2211. When the air pressure inside the cabinet changes, the regulating plate 2211 automatically adjusts its opening degree according to the air pressure inside the cabinet through the mechanical structure of the spring 2213 and the connecting rod 2213, thereby changing the passage area of ​​the cooling air.

[0095] For example, if the opening of the regulating plate 2211 needs to be increased to increase the cooling airflow within the cabinet, the speed of the cooling fan can be increased to increase the air pressure, thereby increasing the rotation angle, i.e., the opening, of the regulating plate 2211. For instance, a thermal sensor is installed at a designated location in the power conversion unit partition 4, where heat dissipation requirements are high. When the temperature detected by the thermal sensor exceeds a certain threshold, the cooling fan speed is increased. Although increasing the cooling fan speed may shorten its lifespan, when there is an urgent need to enhance the cooling effect of the power conversion unit partition 4, the cooling airflow within the cabinet can be prioritized by increasing the fan speed.

[0096] <Function of the Adjustment Plate>

[0097] The following overall flow regulation and zone flow allocation can be achieved through the adjustment panel 2211.

[0098] Overall flow regulation: When the regulating plate 2211 is turned on, the portion flowing along the second flow path L2 is increased compared to when it is turned off. Therefore, the overall flow resistance of the cooling system is reduced and the total cooling airflow of the cooling system is increased.

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

[0100] [Variant]

[0101] Figure 4 The example is shown in which the flow regulating structure 2 is formed with 10 openings and 10 automatic regulators 22 are installed. However, the number and position of the openings of the flow regulating structure 2, the number and position of the automatic regulators 22 are not limited to Figure 4 the case shown, and can be appropriately set as needed. For example, only the automatic regulator 221 can be installed on the side surface, and no automatic regulator 222 can be installed on the bottom surface. In addition, on the front and rear side surfaces, instead of installing two automatic regulators 22 openings each, one automatic regulator 22 can be installed, and the one automatic regulator 22 can be formed in a longer strip shape.

[0102] In addition, each automatic regulator 22 can be of the same structure or of different structures, but in the case of the same structure, the types of components can be reduced, and therefore is preferred.

[0103] Figure 5 and Figure 6 The automatic regulator 221 is shown as having a spring and a connecting rod, but the utility model can only be based on the combination of fluid mechanics and mechanical structure to make the adjustment plate open and close, and is not limited to Figure 5 and Figure 6 the specific examples shown.

[0104] In addition, the utility model installs the automatic regulator 22 at the opening of the flow regulating structure 2, and a sealing plate that closes the opening can also be installed at the opening. In the case of installing the sealing plate, the air cooling system of the high-voltage frequency converter can also be used as a traditional series air duct air cooling system.

[0105] [Effects]

[0106] The air cooling system of the high-voltage frequency converter of the utility model can obtain the following effects.

[0107] According to the high-voltage frequency converter's air cooling system of the utility model, through the opening of the automatic regulator, in the air cooling system, in addition to the first flow path of the cooling air flowing out in turn through the power conversion unit partition air duct, transformer partition air duct and common air duct, the second flow path of the cooling air flowing out as a new flow path after passing through the power conversion unit partition air duct and directly entering the common air duct is formed. Thus, the flow resistance of the cooling system as a whole can be reduced, the cooling air flow of the cooling system as a whole is increased, and the exhaust temperature of the cooling fan is reduced. Since the service life of the cooling fan is inversely proportional to the working temperature of the bearing grease, and the working temperature of the bearing grease is significantly reduced when the exhaust temperature is reduced, the service life of the cooling fan can be prolonged.

[0108] In addition, the second flow path as a new flow path is formed by the opening of the automatic regulator, so that the complete series air duct when the automatic regulator is closed is destroyed, and thus the cooling air flow in the power conversion unit partition and the transformer partition is no longer the same, the cooling air flow through the power conversion unit partition is increased, and the cooling air flow through the transformer partition is reduced. Therefore, the cooling air flow can be adjusted according to each partition of the power conversion unit partition and the transformer partition, the partition flow distribution can be performed, and different cooling effect control can be performed on 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. Thus, according to the heat dissipation demand of different partitions, the cooling air flow is automatically adjusted, the devices in each partition work in a more reasonable temperature range, and the overall performance and reliability of the equipment can be improved.

[0109] According to the high-voltage frequency converter's air cooling system of the utility model, 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 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. The transformer partition is usually designed with a large heat dissipation redundancy to ensure that the heat dissipation demand is met during high-load operation. However, this design will cause waste of cooling air flow during normal operation, increasing energy consumption. In contrast, in the utility model, by having a regulator, by opening the regulator, the cooling air flow through the power conversion unit partition can be increased and the cooling air flow through the transformer partition can be reduced, thereby only a smaller heat dissipation redundancy than before is provided for the transformer partition, and the operating efficiency of the cooling fan can be increased.

[0110] The opening and closing of the regulator and the opening degree can be dynamically adjusted, the cooling air flow path in the cooling system and the flow distribution to each cooling air flow path are dynamically adjustable through the adjustment, and therefore, dynamic adjustment can be performed according to different operating conditions.

[0111] According to the air cooling system of the high-voltage frequency converter, the required number of automatic regulators are arranged at different positions of the bottom surface and the lower portions of the four side surfaces of the flow regulating structure, the number and positions of the automatic regulators can be set according to actual operating conditions, and the heat dissipation performance of the air cooling system can be improved.

[0112] According to the air cooling system of the high-voltage frequency converter, the regulating plate can realize flexible opening and closing actions under the cooperation of the spring and the connecting rod, the flow path and flow of the cooling air can be automatically controlled through the 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, the automatic regulator can be conveniently disassembled through the opening, and maintenance and repair are facilitated.

[0114] According to the air cooling system of the high-voltage frequency converter, only the flow regulating structure provided with the regulator is additionally arranged in the existing air cooling system, and large-scale redesign and equipment modification are not required.

[0115] The air cooling system of the high-voltage frequency converter of the embodiment of the utility model is described above, but the embodiment is proposed as an example and is not intended to limit the scope of the utility model. The embodiment can be implemented in other various ways, various omissions, substitutions, and changes can be made within the scope of the utility model without departing from the spirit of the utility model. These embodiments and their modifications are included in the scope or spirit of the utility model, and are also included in the utility model and its equivalent range described in the claims.

Claims

1. A wind-cooling system for a high-voltage frequency converter, characterized in that, The high-voltage frequency converter is arranged in a cabinet with a power conversion unit partition (4) for accommodating power conversion units and a transformer partition (3) for accommodating transformers. A flow regulation structure (2) is installed on the upper part of the transformer section (3). The air-cooling system includes a power conversion unit partition air duct (40) formed in the power conversion unit partition, a transformer partition air duct (30) formed in the lower part of the transformer partition in communication with the power conversion unit partition air duct, and a common air duct (20) formed in the flow regulation structure in communication with the transformer partition air duct and in the upper part of the transformer partition. In the flow regulation structure (2), an automatic regulator (22) capable of automatically adjusting to open and close is provided in a detachable manner. When the automatic regulator is in the off state, a first flow path (L1) 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 the on state, the first flow path (L1) and the second flow path (L2) are formed, whereby the cooling air flows through the partitioned air ducts of the power conversion unit and then directly enters the common air duct and flows out.

2. The air-cooling system for the high-voltage frequency converter according to claim 1, characterized in that, When the air pressure inside the cabinet is below the specified pressure value, the automatic regulator is kept in the off state. When the air pressure inside the cabinet exceeds the specified pressure value, the automatic regulator is activated.

3. The air-cooling system for the high-voltage frequency converter according to claim 1, characterized in that, The automatic regulator can freely adjust the opening degree when it is turned on, thereby adjusting the ratio of cooling airflow through the transformer section and the power conversion unit section.

4. The air-cooling system for the high-voltage frequency converter according to claim 1, characterized in that, The flow regulation structure is formed into a cubic frame. At least one automatic regulator is provided on the bottom surface and / or the lower part of the four sides of the flow regulating structure.

5. The air-cooling system for the high-voltage frequency converter according to any one of claims 1 to 4, characterized in that, The automatic regulator includes: The regulator base (2212) is detachably mounted to the flow regulation structure; An adjustment plate (2211) is mounted on the regulator base via a rotatable rotating shaft (2215) and can be opened and closed by rotating the rotating shaft; Spring (2213), one end of which is fixed to the regulator base; Linkage (2214) connects the other end of the spring to the rotating shaft. When the air pressure inside the cabinet is below the specified pressure value, the spring, via the connecting rod, keeps the adjusting plate in the closed state. When the air pressure inside the cabinet exceeds the specified pressure value, the adjustment plate applies pressure to the spring via the connecting rod, causing it to elastically deform. The elastically deformed spring then rotates via the connecting rod in the direction that opens the adjustment plate.

6. The air-cooling system for the high-voltage frequency converter according to claim 5, characterized in that, The opening of the regulating plate is adjusted in accordance with the air pressure inside the cabinet, thereby adjusting the opening of the automatic regulator.

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

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

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

10. The air-cooling system for the high-voltage frequency converter according to claim 1, characterized in that, The cabinet has a door panel that can be opened and closed on the front side of the cabinet and has multiple air inlets for cooling air intake.

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