A high-voltage variable-frequency room exhaust and heat dissipation device and method

Abstract

The present invention discloses a high-voltage frequency conversion room exhaust heat dissipation device and method in the technical field of exhaust heat dissipation. It includes: an exhaust duct, the exhaust duct is fixedly connected and communicated with two symmetrically distributed end branches, two symmetrically distributed middle branches, and two symmetrically distributed first branches, and the exhaust duct is provided with an exhaust port; two symmetrically distributed main diversion plates are both arranged in the exhaust duct, and two symmetrically distributed auxiliary diversion plates are arranged in the exhaust duct, and the main diversion plates and the auxiliary diversion plates are used to divide the exhaust duct into a plurality of flow channels. By dividing the exhaust duct into a plurality of flow channels through the main diversion plates and the auxiliary diversion plates, the present invention reduces the probability of local high-pressure areas formed by the collision of airflows in the exhaust duct, thereby reducing the probability of the appearance of a pressure gradient field in the exhaust duct, improving the exhaust efficiency of the end branches and the middle branches, thereby reducing the exhaust fan power of the frequency converter, reducing equipment energy consumption and slowing down the thermal aging rate of the core components.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust heat dissipation, and particularly to an exhaust heat dissipation device and method for a high-voltage variable frequency room. Background Art

[0002] As a special equipment room supporting industrial plants, the core function of the high-voltage variable frequency room is to establish a standard thermodynamic environment for the high-voltage frequency converter cluster. Since the high-voltage frequency converter generates a concentrated high heat load during operation, the existing general mechanical forced exhaust scheme is adopted: through a pipe network system composed of a main air duct and multiple groups of branch air ducts, the waste heat generated during equipment operation is directly discharged outdoors, so as to maintain the internal electronic components of the frequency converter within the allowable temperature rise range.

[0003] In a typical ventilation system, the main air duct adopts a single-point centralized exhaust design, and the branch air ducts distributed along the axis are connected through a reduced-diameter tee component. During system operation, the exhaust fans configured on top of each frequency converter introduce hot air into the main air duct through the branch air ducts and are finally discharged through the end exhaust port; when the air flow in the branch air duct converges into the main air duct at an approximately vertical angle, the two air flows collide at the intersection interface to generate a turbulent vortex, forming a local high-pressure area. This phenomenon causes a pressure gradient field increasing along the axis in the main air duct, which significantly reduces the exhaust efficiency of the end branch air duct, forcing the corresponding frequency converter to increase the power of the exhaust fan to maintain heat dissipation, ultimately resulting in abnormally high equipment energy consumption and accelerated thermal aging of core components. Summary of the Invention

[0004] The present invention provides an exhaust heat dissipation device and method for a high-voltage variable frequency room to overcome the disadvantages that the main air duct in the existing high-voltage variable frequency room ventilation system forms a pressure gradient field due to the inflow of air flows in multiple branch air ducts, resulting in increased energy consumption of the end frequency converter and accelerated thermal aging of core components.

[0005] The technical solution of the present invention is as follows: An exhaust heat dissipation device for a high-voltage variable frequency room includes:

[0006] An exhaust air duct, which is fixedly connected and communicated with two symmetrically distributed end branch pipes, two symmetrically distributed middle branch pipes, and two symmetrically distributed first branch pipes. The exhaust air duct is provided with an exhaust port, and the distances between the end branch pipes, the middle branch pipes, and the first branch pipes and the exhaust port gradually decrease;

[0007] Two symmetrically distributed main diversion plates are both arranged in the exhaust air duct. The middle branch pipes correspond to the middle parts of the main diversion plates. Two symmetrically distributed auxiliary diversion plates are arranged in the exhaust air duct. The first branch pipes correspond to the middle parts of the auxiliary diversion plates. The main diversion plates and the auxiliary diversion plates are used to divide the exhaust air duct into multiple flow channels.

[0008] Further, the symmetry planes of the two main air guiding plates, the symmetry planes of the two auxiliary air guiding plates, and the symmetry plane of the exhaust duct are coplanar. The distance between the symmetry plane of the main air guiding plate and the symmetry plane of the exhaust duct is less than the distance between the symmetry plane of the auxiliary air guiding plate and the symmetry plane of the exhaust duct. The side of the main air guiding plate close to the air outlet is located between the two auxiliary air guiding plates.

[0009] Further, drainage portions are provided at positions of the main air guiding plate and the auxiliary air guiding plate away from the air outlet. The drainage portion on the main air guiding plate is located between the end branch pipe and the middle branch pipe, and the drainage portion on the auxiliary air guiding plate is located between the middle branch pipe and the first branch pipe. The drainage portion is used to guide the air flow in the exhaust duct.

[0010] Further, guiding blocks are fixedly connected to positions of the main air guiding plate close to the adjacent middle branch pipe and the auxiliary air guiding plate close to the adjacent first branch pipe. The guiding blocks are used to guide the air flow in the exhaust duct.

[0011] Further, it further includes:

[0012] An adjusting assembly, which is arranged in the exhaust duct and is used to adjust the distance between the two main air guiding plates and the two auxiliary air guiding plates. The adjusting assembly includes:

[0013] A plurality of support rods, which are all rotatably connected in the exhaust duct, and each main air guiding plate and auxiliary air guiding plate corresponds to at least two support rods. The main air guiding plate and the auxiliary air guiding plate are both provided with swing frames. The number of swing frames is equal to the number of support rods. The swing frames are rotatably connected to the adjacent support rods, and torsion springs are fixedly connected between the swing frames and the adjacent support rods. The swing frames on the same main air guiding plate and auxiliary air guiding plate are jointly rotatably connected to a series rod.

[0014] Further, it further includes:

[0015] A fan, which is installed in the exhaust duct close to the end branch pipe. The fan is used to accelerate the air flow rate in the exhaust duct.

[0016] Further, wind shielding plates are fixedly connected to positions on the opposite sides of the two main air guiding plates close to the fan through brackets. In the direction from the first branch pipe to the end branch pipe, the distance between the two wind shielding plates gradually decreases.

[0017] Further, it further includes:

[0018] An electric push rod, which is installed on the exhaust duct. The telescopic end of the electric push rod passes through the exhaust duct and is fixedly connected to a connecting frame. The main air guiding plate and the auxiliary air guiding plate are both slidably connected to the connecting frame;

[0019] Four sealing strips are all hermetically and slidably connected to the exhaust duct. The main diversion plate and the secondary diversion plate are respectively hermetically and slidably connected to the adjacent sealing strips, and the main diversion plate and the secondary diversion plate are respectively limitedly slidably and rotatably connected to the adjacent swing frames.

[0020] Furthermore, heat exchange cavities are arranged in both the main diversion plate and the secondary diversion plate, and liquid absorption sheets are fixedly connected in the heat exchange cavities and heat transfer working media are stored therein.

[0021] A method for exhausting and dissipating heat in a high-voltage frequency conversion room, based on the above-mentioned device for exhausting and dissipating heat in a high-voltage frequency conversion room, the specific steps are as follows:

[0022] Step 1: When exhausting and dissipating heat from the frequency converter in the frequency conversion room, start the exhaust fan at the top of the frequency converter, convey the heat generated during the operation of the frequency converter into the exhaust duct, and flow forward along the flow channels separated by the main diversion plate and the secondary diversion plate in the exhaust duct, and finally be discharged to the outside through the exhaust port;

[0023] Step 2: When the air flows in the middle branch pipe and the first branch pipe enter the exhaust duct, they will blow the main diversion plate and the secondary diversion plate to move, so that the distance between the two main diversion plates and the distance between the two secondary diversion plates are reduced, and thus the flow area of each flow channel in the exhaust duct is adjusted automatically according to the flow velocity of the air in the middle branch pipe and the first branch pipe;

[0024] Step 3: Set the power threshold of the exhaust fan. After the power of all six exhaust fans reaches the threshold, the power of the exhaust fan will no longer increase. Start the blower, and the blower assists the air flow in the end branch pipe and the middle branch pipe to enter the exhaust duct, accelerate the air flow velocity in the exhaust duct, reduce the air pressure in the exhaust duct, reduce the pressure difference on both sides of the exhaust fan at the top of the frequency converter, and improve the exhaust efficiency of the exhaust fan at the top of the frequency converter. When the power of the exhaust fan of the frequency converter is less than the set threshold, stop the blower;

[0025] Step 4: While the blower is running, set the threshold of the temperature difference on both sides of the exhaust fan, and start the electric push rod after reaching the set threshold. Control the connecting frame to move down through the electric push rod, and the connecting frame drives the main diversion plate and the secondary diversion plate to extend out of the exhaust duct, and use the heat pipe system in the main diversion plate and the secondary diversion plate to exchange heat with the air inside the frequency conversion room, so as to increase the temperature difference on both sides of the exhaust fan at the top of the frequency converter;

[0026] Step 5: When the frequency converter stops running or the blower stops running, control the connecting frame, the main diversion plate and the secondary diversion plate to move up and reset through the electric push rod.

[0027] In the present invention, the exhaust duct is divided into multiple flow channels by the main diversion plate and the auxiliary diversion plate, reducing the probability of local high-pressure areas formed by air flow collision in the exhaust duct, thereby reducing the probability of a pressure gradient field appearing in the exhaust duct, improving the exhaust efficiency of the end branch pipe and the middle branch pipe, further reducing the power of the exhaust fan of the frequency converter, reducing equipment energy consumption, and slowing down the thermal aging rate of the core components.

[0028] The main diversion plate and the auxiliary diversion plate are used to delimit flow channels in the exhaust duct, but do not restrict the flow path of the air flow, enabling the gas in the exhaust duct to freely select the flow path according to resistance and flow rate, improving the applicability of the device.

[0029] The diversion part is used to guide the air flow in the exhaust duct into a separate flow channel, reducing the probability of air flow collision in the exhaust duct, thereby reducing the probability of local high-pressure areas appearing in the exhaust duct; the guide block is used to change the flow direction of the air flow entering the exhaust duct, reducing the degree of chaos when the air flow enters the exhaust duct, and reducing the flow resistance when the air flow in the branch pipe enters the exhaust duct.

[0030] By changing the relative positions of the main diversion plate and the auxiliary diversion plate in the exhaust duct, the flow areas of the respective flow channels in the exhaust duct are changed. When the gas flow rates in the end branch pipe, the middle branch pipe, and the first branch pipe are different, the flow areas of the corresponding flow channels can be adaptively adjusted, minimizing the probability of local high pressure formed by air flow collision in the exhaust duct, improving the exhaust heat dissipation efficiency of the frequency converter, and saving the energy consumption of the frequency converter.

[0031] The main diversion plate and the auxiliary diversion plate are used to conduct heat exchange between the gas in the exhaust duct and the air inside the frequency conversion chamber, reducing the temperature of the gas in the exhaust duct and improving the heat exchange efficiency of the frequency converter. Brief Description of the Drawings

[0032] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0033] Figure 2 is a three-dimensional structural schematic diagram of the main diversion plate and the auxiliary diversion plate of the present invention;

[0034] Figure 3 is a three-dimensional structural schematic diagram of the main diversion plate and the fan of the present invention;

[0035] Figure 4 is a three-dimensional structural schematic diagram of the main diversion plate and the guide block of the present invention;

[0036] Figure 5 is a three-dimensional structural schematic diagram of the guide block and the swing frame of the present invention;

[0037] Figure 6 is a three-dimensional structural schematic diagram of the support rod and the swing frame of the present invention;

[0038] Figure 7Schematic three-dimensional structure diagram of the main drainage plate and the wind shield of the present invention;

[0039] Figure 8 Schematic three-dimensional structure diagram of the auxiliary drainage plate and the connecting frame of the present invention;

[0040] Figure 9 Schematic cross-sectional view of the three-dimensional structure of the main drainage plate and the sealing strip of the present invention.

[0041] Reference signs in the drawings: 1 - exhaust duct, 101 - end branch pipe, 102 - middle branch pipe, 103 - head branch pipe, 104 - exhaust port, 2 - main drainage plate, 201 - drainage part, 3 - auxiliary drainage plate, 4 - guiding block, 5 - supporting rod, 6 - swing frame, 7 - series rod, 8 - fan, 9 - wind shield, 10 - electric push rod, 11 - connecting frame, 12 - sealing strip, 13 - liquid suction sheet. Detailed implementation manners

[0042] The following will combine the attached Figure 1 to the attached Figure 9 The present invention will be described in detail. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0043] A high-voltage variable-frequency room exhaust and heat dissipation device. Please refer to Figures 1 - 4 , including: an exhaust duct 1, the exhaust duct 1 is fixedly connected and communicated with two symmetrically distributed end branch pipes 101, two symmetrically distributed middle branch pipes 102 and two symmetrically distributed head branch pipes 103. The exhaust duct 1 is provided with an exhaust port 104. The distances between the end branch pipe 101, the middle branch pipe 102, the head branch pipe 103 and the exhaust port 104 decrease step by step; two symmetrically distributed main drainage plates 2 are both arranged in the exhaust duct 1. The middle branch pipe 102 corresponds to the middle part of the main drainage plate 2. Two symmetrically distributed auxiliary drainage plates 3 are arranged in the exhaust duct 1. The head branch pipe 103 corresponds to the middle part of the auxiliary drainage plate 3. The main drainage plate 2 and the auxiliary drainage plate 3 are used to divide the exhaust duct 1 into multiple flow channels; the symmetry planes of the two main drainage plates 2, the symmetry planes of the two auxiliary drainage plates 3 and the symmetry plane of the exhaust duct 1 are coplanar. The distance between the main drainage plate 2 and the symmetry plane of the exhaust duct 1 is less than the distance between the auxiliary drainage plate 3 and the symmetry plane of the exhaust duct 1. The side of the main drainage plate 2 close to the exhaust port 104 is located between the two auxiliary drainage plates 3.

[0044] In the above solution, it aims to solve the problem that in the existing ventilation system of the high-voltage frequency conversion room, the main air duct forms a pressure gradient field due to the confluence of airflows in multiple branch air ducts, resulting in increased energy consumption of the end frequency converter and accelerated thermal aging of the core components. In this solution, the main drainage plate 2 and the auxiliary drainage plate 3 divide the exhaust duct 1 into multiple flow channels, reducing the probability of forming a local high-pressure area due to the collision of airflows in the exhaust duct 1, thereby reducing the probability of a pressure gradient field appearing in the exhaust duct 1, improving the exhaust efficiency of the end branch pipe 101 and the middle branch pipe 102, further reducing the exhaust fan power of the frequency converter, reducing equipment energy consumption and slowing down the thermal aging rate of the core components. When using this device to dissipate heat from the frequency converter, the end branch pipe 101, the middle branch pipe 102, and the first branch pipe 103 are connected to the exhaust fan on the top of the frequency converter. The positions of the end branch pipe 101, the middle branch pipe 102, and the first branch pipe 103 on the exhaust duct 1 can be determined according to the position of the frequency converter during actual use. A screen is installed at the air outlet 104 to reduce the probability of insects, birds, etc. entering the exhaust duct 1. The air outlet 104 faces obliquely downward to prevent rainwater from entering the exhaust duct 1.

[0045] The rear side of the main drainage plate 2 is not in the middle position between the two end branch pipes 101, which is convenient for the gas discharged from the two end branch pipes 101 to enter the above-mentioned flow channel after collision and mixing, reducing the probability of mixed collision between the gas entering the exhaust duct 1 from the end branch pipe 101 and the gas discharged from the middle branch pipe 102. Here, the connection relationship between the main drainage plate 2 and the auxiliary drainage plate 3 and the exhaust duct 1 can be regarded as a fixed connection. The front part of the main drainage plate 2 is located between the two auxiliary drainage plates 3, which is used to mix and flow the airflows discharged from the end branch pipe 101 and the middle branch pipe 102 between the two auxiliary drainage plates 3.

[0046] Please refer to Figures 3 - 5 , drainage parts 201 are provided at positions of the main drainage plate 2 and the auxiliary drainage plate 3 far from the air outlet 104. The drainage part 201 on the main drainage plate 2 is located between the end branch pipe 101 and the middle branch pipe 102, and the drainage part 201 on the auxiliary drainage plate 3 is located between the middle branch pipe 102 and the first branch pipe 103. The drainage part 201 is used to guide the airflow in the exhaust duct 1. Guide blocks 4 are fixedly connected to the positions of the main drainage plate 2 close to the adjacent middle branch pipe 102 and the auxiliary drainage plate 3 close to the adjacent first branch pipe 103. The guide blocks 4 are used to guide the airflow in the exhaust duct 1.

[0047] In the above solution, it is aimed to use the drainage part 201 to guide the airflow in the exhaust duct 1 into a separate flow channel, reduce the probability of the airflow in the exhaust duct 1 colliding with each other, and further reduce the probability of a local high-pressure area appearing in the exhaust duct 1; use the guiding block 4 to change the flow direction of the airflow entering the exhaust duct 1, reduce the degree of chaos when the airflow enters the exhaust duct 1, and reduce the flow resistance when the airflow in the branch pipe enters the exhaust duct 1; an arc surface is arranged at the front part of the guiding block 4, an inclined surface is arranged at the rear part of the guiding block 4, the arc surface of the guiding block 4 corresponds to the rear side of the adjacent middle branch pipe 102 or the adjacent first branch pipe 103, and is used to guide the airflow entering the exhaust duct 1 from the middle branch pipe 102 and the first branch pipe 103 to flow forward, reduce the degree of chaos of the airflow, and the inclined surface of the guiding block 4 is used to reduce the obstruction of the guiding block 4 to the airflow behind it.

[0048] During the use of the high-voltage frequency conversion cabinet in the high-voltage frequency conversion room, the exhaust fan at the top of the frequency conversion cabinet is turned on, continuously transporting the hot airflow inside the frequency converter to the exhaust duct 1, and discharging it to the outside through the exhaust port 104, so as to maintain the normal temperature range of the frequency converter during operation; the airflow in two of the last branch pipes 101 enters the end of the exhaust duct 1 (the end in this article refers to the end of the exhaust duct 1 far from the exhaust port 104), and collides in the middle of the end of the exhaust duct 1. At this time, the gas at the end of the exhaust duct 1 has two flow paths: entering between the two main drainage plates 2 or entering between the exhaust duct 1 and the main drainage plate 2. However, since the gas will be impacted by the airflow in the middle branch pipe 102 during the flow between the exhaust duct 1 and the main drainage plate 2 to form a local high-pressure area and has a large flow resistance, the gas at the end of the exhaust duct 1 will preferentially enter between the two main drainage plates 2 and flow forward under the guidance of the drainage part 201 on the main drainage plate 2. The main drainage plate 2 is used to separate the airflow transported by the middle branch pipe 102 into the exhaust duct 1 from the airflow at the end of the exhaust duct 1, so that the airflow flowing forward between the two main drainage plates will not be directly impacted by the airflow in the middle branch pipe 102, thereby reducing the flow resistance of the gas in the exhaust duct 1.

[0049] The air flow flowing into the exhaust duct 1 from the middle branch pipe 102 contacts the side surface of the adjacent main diversion plate 2, and flows forward along the side surface of the main diversion plate 2 under the guidance of the arc surface of the guiding block 4. At this time, the air flow has two flow paths: the gap between the main diversion plate 2 and the adjacent auxiliary diversion plate 3, and the gap between the auxiliary diversion plate 3 and the exhaust duct 1. Since the resistance suffered by the air flow during the process of entering the gap between the main diversion plate 2 and the adjacent auxiliary diversion plate 3 is small, the air flow in the middle branch pipe 102 will preferentially flow forward along the gap between the main diversion plate 2 and the adjacent auxiliary diversion plate 3 after entering the exhaust duct 1. Subsequently, the air flow enters between the two auxiliary diversion plates 3 and converges with the air flow flowing forward between the two main diversion plates 2. Since the flow directions of the two air flows are the same at this time, their convergence will not generate turbulent vortices and will not affect their normal flow; if the gas flow rate in the middle branch pipe 102 is large and the gap between the main diversion plate 2 and the adjacent auxiliary diversion plate 3 is not sufficient to quickly discharge the gas in the middle branch pipe 102, the pressure at the middle branch pipe 102 will increase. When the pressure increases to exceed the local high pressure generated after the gas in the first branch pipe 103 collides with the gas in the exhaust duct 1, part of the gas in the middle branch pipe 102 will be diverted to the gap between the auxiliary diversion plate 3 and the exhaust duct 1. The same is true when the gas flow rate in the end branch pipe 101 is large; in this way, the main diversion plate 2 and the auxiliary diversion plate 3 are used to delimit the flow path in the exhaust duct 1, but the flow path of the air flow is not restricted, so that the gas in the exhaust duct 1 can automatically select the flow path according to the resistance and flow rate, improving the applicability of the device.

[0050] The air flow flowing into the exhaust duct 1 from the first branch pipe 103 contacts the side surface of the adjacent auxiliary diversion plate 3, and flows forward along the side surface of the auxiliary diversion plate 3 under the guidance of the arc surface of the guiding block 4. Finally, when it flows to the front side of the auxiliary diversion plate 3, it mixes with the air flow between the two auxiliary diversion plates 3 and is discharged together through the air outlet 104 until the fan on the top of the frequency converter stops running when the frequency converter stops.

[0051] Please refer to Figures 3 - 8 It further includes: an adjusting component, which is arranged in the exhaust duct 1 and is used to adjust the distance between the two main diversion plates 2 and the two auxiliary diversion plates 3. The adjusting component includes: a plurality of support rods 5, which are all rotatably connected in the exhaust duct 1, and each main diversion plate 2 and auxiliary diversion plate 3 corresponds to at least two support rods 5. Swing frames 6 are arranged on both the main diversion plate 2 and the auxiliary diversion plate 3. The number of swing frames 6 is equal to that of the support rods 5. The swing frames 6 are rotatably connected to the adjacent support rods 5. A torsion spring is fixedly connected between the swing frames 6 and the adjacent support rods 5. The swing frames 6 on the same main diversion plate 2 and auxiliary diversion plate 3 are jointly rotatably connected to a series rod 7.

[0052] In the above solution, it is aimed to enable the main drainage plate 2 and the auxiliary drainage plate 3 to move within the exhaust duct 1, thereby changing the flow area of each flow channel within the exhaust duct 1. When the gas flow rates in the end branch pipe 101, the middle branch pipe 102, and the head branch pipe 103 are different, it can adaptively adjust the flow area of the corresponding flow channel, minimizing the probability of local high pressure formed by the collision of airflows within the exhaust duct 1, improving the exhaust heat dissipation efficiency of the frequency converter, and saving the energy consumption of the frequency converter; the series rod 7 is used to connect two swing frames 6 on the same main drainage plate 2 or the same auxiliary drainage plate 3 into one body, enabling the two swing frames 6 to swing synchronously, so that the main drainage plate 2 or the auxiliary drainage plate 3 can translate while maintaining the initial direction; here, the connection state between the main drainage plate 2 and the auxiliary drainage plate 3 and the exhaust duct 1 can be regarded as fitting and sliding; initially, both the main drainage plate 2 and the auxiliary drainage plate 3 can move in the left-right direction, and both the main drainage plate 2 and the auxiliary drainage plate 3 are at the middle position of their movable ranges. The elastic coefficient of the torsion spring on the swing frame 6 is determined by the power of the exhaust fan on the top of the frequency converter, so that when the exhaust fans of the six frequency converters all operate at the rated power, the positions of the main drainage plate 2 and the auxiliary drainage plate 3 can remain unchanged at the initial positions.

[0053] When using this device to exhaust heat from the frequency converter, since the electrical components controlled by different frequency converters are different, the heat generation rates during the operation of different frequency converters are different. The frequency converter can independently adjust the power of the exhaust fan on its top according to its own heat generation amount to achieve the purpose of energy saving. Therefore, the fans on the top of the frequency converter usually do not operate at the rated power. With the start of the exhaust fans on the top of the frequency converter, the hot airflows inside the six frequency converters are respectively transported into the exhaust duct 1 through the adjacent end branch pipe 101, middle branch pipe 102, or head branch pipe 103. When the gas entering the exhaust duct 1 from the end branch pipe 101 flows between the two main drainage plates 2, it will exert a pressure on the main drainage plate 2 away from the symmetry plane of the exhaust duct 1. When the airflow in the middle branch pipe 102 enters the exhaust duct 1, the airflow impacts the main drainage plate 2. The main drainage plate 2 moves under the action of the impact force and pressure of the airflow, driving the adjacent swing frame 6 and series rod 7 to move, and twisting the torsion spring of the swing frame 6, changing the gap between the main drainage plate 2 and the exhaust duct 1 until the pressure of the gas in the end branch pipe 101 on the main drainage plate 2, the impact force of the gas in the middle branch pipe 102, and the torsion force of the torsion spring of the swing frame 6 are balanced, and then the main drainage plate 2 stops moving; similarly, the airflow in the head branch pipe 103 impacts the adjacent auxiliary drainage plate 3, and the gap between the two auxiliary drainage plates 3 is adjusted automatically according to the pressure of the gas inside and the impact force of the gas in the head branch pipe 103. In this way, the flow area of each flow channel is adjusted automatically, reducing the influence of the flow area on the airflow within the exhaust duct 1, improving the exhaust efficiency of the end branch pipe 101, middle branch pipe 102, and head branch pipe 103, and further reducing the power of the exhaust fan on the frequency converter to achieve the purpose of energy saving.

[0054] When the frequency converter stops running, the main drainage plates 2 and the auxiliary drainage plates 3 move under the action of the torsion springs on the adjacent support rods 5, so that the two main drainage plates 2 and the two auxiliary drainage plates 3 are reset.

[0055] Please refer to Figure 2 、 Figure 3 and Figure 7 , further comprising: a fan 8 installed at a position close to the end branch pipe 101 in the exhaust duct 1, and the fan 8 is used to accelerate the air flow velocity in the exhaust duct 1; wind shielding plates 9 are fixedly connected to the opposite sides of the two main drainage plates 2 close to the fan 8 through brackets, and in the direction from the head branch pipe 103 to the end branch pipe 101, the distance between the two wind shielding plates 9 gradually decreases.

[0056] In the above solution, it aims to solve the problem that when all the frequency converters in the existing high-voltage frequency conversion room operate at high power (that is, the heat generation per unit time of the frequency converter is the largest at this time), the heat generation is high. At this time, the frequency converter increases the power of the exhaust fan at its top. However, as the power of the exhaust fan increases, the air pressure in the main air duct synchronously increases, resulting in an increase in the pressure difference on both sides of the exhaust fan at the top of the frequency converter. As the pressure difference increases, the improvement amplitude of the exhaust efficiency of the exhaust fan with the increase of its power decreases. In this state, the energy effective utilization rate during the operation of the exhaust fan is low; when the frequency converter cluster in the frequency conversion room operates at high power, the fan 8 is used to increase the air flow velocity in the exhaust duct 1, improve the exhaust heat dissipation efficiency of the frequency converter, reduce the probability of the overall pressure increase in the exhaust duct 1 caused by all the exhaust fans of the frequency converters operating at high power, and further improve the exhaust efficiency of the exhaust fan at the top of the frequency converter and the effective utilization rate of energy; the fan 8 is located between the main drainage plate 2 and the end branch pipe 101, and is used to generate a pressure difference on its front and rear sides, so as to reduce the pressure difference on both sides of the exhaust fan at the top of the frequency conversion cabinet corresponding to the end branch pipe 101, and further improve the exhaust heat dissipation efficiency of the frequency converter corresponding to the end branch pipe 101; the rotation axis of the fan blades on the fan 8 is located in the symmetry plane of the exhaust duct 1; there is a gap between the wind shielding plate 9 and the adjacent main drainage plate 2.

[0057] When the frequency conversion cabinet cluster in the high-voltage frequency conversion room operates at high power, the heat generation rate of the frequency conversion cabinet is fast. The worker sets a threshold according to the relationship curve between the power of the exhaust fan and the exhaust efficiency. After the power of the six exhaust fans reaches the threshold, the power of the exhaust fan no longer increases, but the fan 8 is started. The fan 8 conveys the gas at its rear forward, generates a pressure difference on its front and rear sides, sucks the air flow in the end branch pipe 101 into the exhaust duct 1, and accelerates the rate of the air flow in the end branch pipe 101 entering the exhaust duct 1; the fan 8 blows the air flow at the end of the exhaust duct 1 between the two main drainage plates 2, so that a part of the air flow between the two main drainage plates 2 flows forward through between the two wind shielding plates 9, and the other part flows forward through the gap between the wind shielding plate 9 and the adjacent main drainage plate 2.

[0058] When the air flow passes between the wind shield 9 and the adjacent main diversion plate 2, the air flow generates a component force on the wind shield 9 that is close to the symmetry plane of the exhaust duct 1, causing the wind shield 9 to drive the adjacent main diversion plate 2 to move. The main diversion plate 2 drives the adjacent swing frame 6 to swing and twists the torsion spring of the swing frame 6, so that the gap between the two main diversion plates 2 becomes the minimum state. In this way, the flow area between the two main diversion plates 2 is reduced to increase the flow velocity of the air flow between the two main diversion plates 2. Based on the principle that the pressure is low at the position with high flow velocity, a pressure difference is generated at the gap between the main diversion plate 2 and the auxiliary diversion plate 3, prompting the air flow entering the exhaust duct 1 from the middle branch pipe 102 to enter between the two auxiliary diversion plates 3 and flow quickly, accelerating the exhaust efficiency of the middle branch pipe 102. In this way, the fan 8 is used to accelerate the flow velocity of the gas in the exhaust duct 1, and at the same time, the exhaust efficiency of the frequency converters corresponding to the end and the middle of the exhaust duct 1 is enhanced, which is convenient for maintaining the stability of the exhaust efficiency of the frequency converter. When the power of the exhaust fan of the frequency converter is reduced below the threshold or the frequency converter stops operating, the fan 8 is stopped.

[0059] Please refer to Figures 1 - 3 、 Figure 6 、 Figure 8 and Figure 9 ,further comprising: an electric push rod 10 installed on the exhaust duct 1. The telescopic end of the electric push rod 10 passes through the exhaust duct 1 and is fixedly connected with a connecting frame 11. Both the main diversion plate 2 and the auxiliary diversion plate 3 are slidably connected with the connecting frame 11; four sealing strips 12 are all hermetically and slidably connected to the exhaust duct 1. The main diversion plate 2 and the auxiliary diversion plate 3 are respectively hermetically and slidably connected with the adjacent sealing strips 12. The main diversion plate 2 and the auxiliary diversion plate 3 are respectively limitedly slidably and rotatably connected with the adjacent swing frames 6; heat exchange cavities are arranged in both the main diversion plate 2 and the auxiliary diversion plate 3, and liquid suction sheets 13 are fixedly connected in the heat exchange cavities and heat transfer working media are stored.

[0060] In the above solution, it aims to solve the problem that in the ventilation system used in the existing high-voltage frequency conversion room, after the frequency converter is used at high power for a long time, heat accumulation occurs in the ventilation duct, resulting in a reduction in the temperature difference between the two sides of the exhaust fan at the top of the frequency converter, leading to low heat dissipation efficiency of the frequency converter and increased energy consumption of the frequency converter; the main diversion plate 2 and the secondary diversion plate 3 are used to conduct heat exchange between the gas in the exhaust duct 1 and the air inside the frequency conversion room, reduce the temperature of the gas in the exhaust duct 1, and improve the heat dissipation efficiency of the frequency converter; the heat transfer medium is a phase-change medium, which can absorb heat (here the heat refers to the heat dissipated during the normal operation of the frequency converter, that is, 50°C - 70°C) and vaporize under low pressure, and liquefy when cooled, forming a heat pipe system. Here, acetone is selected; the number of heat exchange chambers is determined by the lengths of the main diversion plate 2 and the secondary diversion plate 3. Here, the heat exchange chambers are several equidistantly distributed, and the inside of the heat exchange chamber is in a state below atmospheric pressure. Here, the pressure is determined according to the temperature change range during the operation of the frequency converter and the boiling point of the heat transfer medium. The heat dissipated into the exhaust duct 1 during the normal operation of the frequency converter can vaporize the heat transfer medium (acetone); the liquid absorption sheet 13 can be made of materials such as wire mesh and metal powder that can cause liquids to be affected by capillary action. Here, the liquid absorption sheet 13 is sintered from metal powder (copper powder).

[0061] During the continuous high-power operation of the frequency converter and the operation of the fan 8, due to heat accumulation in the exhaust duct 1, the heat dissipation efficiency of the frequency converter is low. Workers judge the heat dissipation efficiency of the exhaust fan at this time based on the temperature difference between the two sides of the exhaust fan and set a threshold. After the temperature difference between the two sides of the exhaust fan reaches the set threshold, the electric push rod 10 is started, so that the telescopic end of the electric push rod 10 extends and drives the connecting frame 11 to move downward. The connecting frame 11 drives the main diversion plate 2 and the secondary diversion plate 3 to move downward, so that the lower sides of the main diversion plate 2 and the secondary diversion plate 3 protrude out of the adjacent sealing strips 12. At this time, the lower parts of the heat exchange chambers in the main diversion plate 2 and the secondary diversion plate 3 extend out of the exhaust duct 1 and come into contact with the environment inside the frequency conversion room. Subsequently, the acetone in the middle and upper parts of the heat exchange chambers located inside the exhaust duct 1 (subsequently referred to as the middle and upper parts of the heat exchange chambers) vaporizes, causing a pressure difference between the upper and lower parts of the heat exchange chambers. At this time, the vaporized acetone enters the part of the heat exchange chamber extending outside the exhaust duct 1 (subsequently referred to as the lower part of the heat exchange chamber) under the action of the pressure difference. The acetone exchanges heat with the air inside the frequency conversion room in the lower part of the heat exchange chamber and condenses into a liquid state, and then flows upward again under the capillary action of the liquid absorption sheet 13. In this way, the acetone in the heat exchange chamber undergoes a reciprocating phase change cycle, dissipating the heat accumulated in the exhaust duct 1 into the frequency conversion room, reducing the temperature in the exhaust duct 1, thus increasing the temperature difference between the two sides of the exhaust fan at the top of the frequency converter, and thus improving the heat dissipation efficiency of the frequency converter and reducing the energy consumption of the frequency converter.

[0062] When the frequency converter stops or the fan 8 stops, the electric push rod 10 is used to control the connecting frame 11 to move upward. The connecting frame 11 drives the main drainage plate 2 and the auxiliary drainage plate 3 to move upward, so that the lower sides of the main drainage plate 2 and the auxiliary drainage plate 3 are coplanar with the lower sides of the adjacent sealing strips 12 respectively. In this way, the heat exchange cavity is completely retracted into the exhaust duct 1 and reset.

[0063] A method for exhausting and dissipating heat in a high-voltage frequency conversion room, please refer to Figures 1 - 9 , based on the above-mentioned exhaust and heat dissipation device for a high-voltage frequency conversion room, the specific steps are as follows:

[0064] Step 1: When exhausting and dissipating heat from the frequency converter in the frequency conversion room, start the exhaust fan at the top of the frequency converter, transport the heat generated during the operation of the frequency converter into the exhaust duct 1, and flow forward along the flow channels separated by the main drainage plate 2 and the auxiliary drainage plate 3 in the exhaust duct 1, and finally be discharged to the outside through the exhaust port 104;

[0065] Step 2: When the air flow in the middle branch pipe 102 and the first branch pipe 103 enters the exhaust duct 1, it will blow the main drainage plate 2 and the auxiliary drainage plate 3 to move, reducing the distance between the two main drainage plates 2 and the distance between the two auxiliary drainage plates 3. In this way, the flow area of each flow channel in the exhaust duct 1 is adjusted automatically according to the flow velocity of the air flow in the middle branch pipe 102 and the first branch pipe 103;

[0066] Step 3: Set the power threshold of the exhaust fan. After the power of all six exhaust fans reaches the threshold, the power of the exhaust fan will no longer increase. Start the fan 8. The fan 8 assists the air flow in the last branch pipe 101 and the middle branch pipe 102 to enter the exhaust duct 1, accelerating the flow velocity of the air flow in the exhaust duct 1, reducing the air pressure in the exhaust duct 1, reducing the pressure difference on both sides of the exhaust fan at the top of the frequency converter, and improving the exhaust efficiency of the exhaust fan at the top of the frequency converter. When the power of the exhaust fan of the frequency converter is less than the set threshold, stop the fan 8;

[0067] Step 4: While the fan 8 is running, set the threshold of the temperature difference on both sides of the exhaust fan, and start the electric push rod 10 after reaching the set threshold. Control the connecting frame 11 to move downward through the electric push rod 10. The connecting frame 11 drives the main drainage plate 2 and the auxiliary drainage plate 3 to extend out of the exhaust duct 1, and use the heat pipe system in the main drainage plate 2 and the auxiliary drainage plate 3 to exchange heat with the air inside the frequency conversion room. In this way, the temperature difference on both sides of the exhaust fan at the top of the frequency converter is increased;

[0068] Step 5: When the frequency converter stops or the fan 8 stops, control the connecting frame 11, the main drainage plate 2 and the auxiliary drainage plate 3 to move upward and reset through the electric push rod 10.

[0069] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A high-voltage variable-frequency room exhaust and heat dissipation device, characterized in that it includes: An exhaust duct (1), the exhaust duct (1) is fixedly connected and communicated with two symmetrically distributed end branches (101), two symmetrically distributed middle branches (102) and two symmetrically distributed head branches (103). The exhaust duct (1) is provided with an exhaust port (104). The distances between the end branch (101), the middle branch (102) and the head branch (103) and the exhaust port (104) decrease gradually; Two symmetrically distributed main diversion plates (2), both are arranged in the exhaust duct (1). The middle branch (102) corresponds to the middle part of the main diversion plate (2). Two symmetrically distributed auxiliary diversion plates (3) are arranged in the exhaust duct (1). The head branch (103) corresponds to the middle part of the auxiliary diversion plate (3). The main diversion plate (2) and the auxiliary diversion plate (3) are used to divide the exhaust duct (1) into multiple flow channels; The symmetric planes of the two main diversion plates (2), the symmetric planes of the two auxiliary diversion plates (3) and the symmetric plane of the exhaust duct (1) are coplanar. The distance between the main diversion plate (2) and the symmetric plane of the exhaust duct (1) is less than the distance between the auxiliary diversion plate (3) and the symmetric plane of the exhaust duct (1). The side of the main diversion plate (2) close to the exhaust port (104) is located between the two auxiliary diversion plates (3); It further includes: An adjustment component, arranged in the exhaust duct (1), used to adjust the distances between the two main diversion plates (2) and the two auxiliary diversion plates (3). The adjustment component includes: A plurality of support rods (5), all are rotatably connected in the exhaust duct (1), and each main diversion plate (2) and auxiliary diversion plate (3) corresponds to at least two support rods (5). The main diversion plate (2) and the auxiliary diversion plate (3) are both provided with swing frames (6). The number of swing frames (6) is equal to that of the support rods (5). The swing frame (6) is rotatably connected to the adjacent support rod (5). A torsion spring is fixedly connected between the swing frame (6) and the adjacent support rod (5). The swing frames (6) on the same main diversion plate (2) and auxiliary diversion plate (3) are jointly rotatably connected to a series rod (7).

2. The exhaust and heat dissipation device for a high-voltage variable-frequency room according to claim 1, wherein Diversion parts (201) are arranged at positions of the main diversion plate (2) and the auxiliary diversion plate (3) far from the exhaust port (104). The diversion part (201) on the main diversion plate (2) is located between the end branch (101) and the middle branch (102). The diversion part (201) on the auxiliary diversion plate (3) is located between the middle branch (102) and the head branch (103). The diversion part (201) is used to guide the air flow in the exhaust duct (1); 3. The exhaust heat dissipation device for a high-voltage frequency conversion room according to claim 2, wherein, Guide blocks (4) are fixedly connected to positions of the main diversion plate (2) close to the adjacent middle branch (102) and the auxiliary diversion plate (3) close to the adjacent head branch (103). The guide blocks (4) are used to guide the air flow in the exhaust duct (1); 4. A high-voltage variable-frequency room exhaust and heat dissipation device according to claim 3, characterized in that it also It includes: A blower (8) is installed inside the exhaust duct (1) near the end branch pipe (101), and the blower (8) is used to accelerate the flow rate of the air flow inside the exhaust duct (1).

5. The exhaust heat dissipation device for a high-voltage variable-frequency room according to claim 4, characterized in that, On the opposite sides of the two main diversion plates (2) near the blower (8), wind shields (9) are fixedly connected through brackets. In the direction from the head branch pipe (103) to the end branch pipe (101), the distance between the two wind shields (9) gradually decreases.

6. The exhaust heat dissipation device for a high-voltage variable frequency room according to claim 5, characterized in that it further It includes: An electric push rod (10) is installed on the exhaust duct (1). The telescopic end of the electric push rod (10) passes through the exhaust duct (1) and is fixedly connected with a connecting frame (11). Both the main diversion plate (2) and the auxiliary diversion plate (3) are slidably connected to the connecting frame (11); Four sealing strips (12) are all hermetically and slidably connected to the exhaust duct (1). The main diversion plate (2) and the auxiliary diversion plate (3) are respectively hermetically and slidably connected to the adjacent sealing strips (12). The main diversion plate (2) and the auxiliary diversion plate (3) are respectively in limit sliding and rotational connection with the adjacent swing frames (6).

7. The exhaust heat dissipation device for a high-voltage frequency conversion room according to claim 6, characterized in that, Heat exchange cavities are arranged inside both the main diversion plate (2) and the auxiliary diversion plate (3), and liquid suction sheets (13) are fixedly connected inside the heat exchange cavities and heat transfer working media are stored.

8. A method for exhausting and dissipating heat in a high-voltage variable-frequency room, according to the high-voltage variable-frequency room exhaust and heat dissipation device described in claim 7, characterized in that, The specific steps are as follows: Step 1: When exhausting and dissipating heat from the frequency converter in the frequency conversion room, start the exhaust fan at the top of the frequency converter, convey the heat generated during the operation of the frequency converter into the exhaust duct (1), and flow forward along the flow channels separated by the main diversion plate (2) and the auxiliary diversion plate (3) inside the exhaust duct (1), and finally be discharged to the outside through the exhaust port (104); Step 2: When the air flow in the middle branch pipe (102) and the head branch pipe (103) enters the exhaust duct (1), it will blow the main diversion plate (2) and the auxiliary diversion plate (3) to move, so that the distance between the two main diversion plates (2) and the distance between the two auxiliary diversion plates (3) decrease, and thus the flow area of each flow channel inside the exhaust duct (1) is adjusted automatically according to the flow rate of the air flow in the middle branch pipe (102) and the head branch pipe (103); Step 3: Set the power threshold of the exhaust fan. After the power of all six exhaust fans reaches the threshold, the power of the exhaust fan will no longer increase. Start the blower (8). The blower (8) assists the air flow in the end branch pipe (101) and the middle branch pipe (102) to enter the exhaust duct (1), accelerates the flow rate of the air flow inside the exhaust duct (1), reduces the air pressure inside the exhaust duct (1), reduces the pressure difference on both sides of the exhaust fan at the top of the frequency converter, and improves the exhaust efficiency of the exhaust fan at the top of the frequency converter. When the power of the exhaust fan of the frequency converter is less than the set threshold, stop the blower (8); Step 4: While the blower (8) is running, set the threshold of the temperature difference on both sides of the exhaust fan, and start the electric push rod (10) after reaching the set threshold. Control the connecting frame (11) to move downward through the electric push rod (10). The connecting frame (11) drives the main diversion plate (2) and the auxiliary diversion plate (3) to extend outside the exhaust duct (1), and use the heat pipe system inside the main diversion plate (2) and the auxiliary diversion plate (3) to conduct heat exchange with the air inside the frequency conversion room, so as to increase the temperature difference on both sides of the exhaust fan at the top of the frequency converter; Step Five: When the frequency converter stops or the fan (8) stops, control the connecting frame (11), the main drainage plate (2) and the auxiliary drainage plate (3) to move upward and reset through the electric push rod (10).

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