Air exhaust and heat dissipation device and method for high-voltage frequency conversion chamber

Abstract

The invention discloses an air exhaust and heat dissipation device and method for a high-voltage frequency conversion chamber, and relates to the technical field of air exhaust and heat dissipation. Comprising an exhaust pipe, the exhaust pipe is fixedly connected and communicated with two symmetrically-distributed tail branch pipes, two symmetrically-distributed middle branch pipes and two symmetrically-distributed head branch pipes, and the exhaust pipe is provided with an exhaust outlet; the two main drainage plates are symmetrically distributed and are arranged in the exhaust pipe, the two auxiliary drainage plates are symmetrically distributed in the exhaust pipe, and the main drainage plates and the auxiliary drainage plates are used for dividing the exhaust pipe into a plurality of flow channels. The exhaust pipe is divided into a plurality of flow channels through the main drainage plate and the auxiliary drainage plate, the probability that airflow in the exhaust pipe collides to form a local high-pressure area is reduced, the probability that a pressure gradient field appears in the exhaust pipe is further reduced, the exhaust efficiency of the tail branch pipe and the middle branch pipe is improved, the exhaust fan power of the frequency converter is further reduced, and the service life of the frequency converter is prolonged. The equipment energy consumption is reduced; and the thermal aging rate of core elements is slowed down.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust and heat dissipation, and in particular to an exhaust and heat dissipation device for a high-voltage frequency conversion chamber and a method thereof. Background Art

[0002] As a special equipment room for industrial plants, the core function of the high-voltage frequency converter room is to establish a standard thermodynamic environment for the high-voltage frequency converter cluster. Since the high-voltage frequency converter will generate a centralized high heat load during operation, a mechanical forced exhaust solution is commonly used: through a pipe network system consisting of a main air duct and multiple sets of branch air ducts, the waste heat generated during equipment operation is directly discharged to the outdoors, thereby maintaining the internal electronic components of the frequency converter working 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 axial direction are connected by a reducing tee component. When the system is running, the exhaust fan configured on the top of each inverter introduces the hot air into the main air duct through the branch air duct, and finally discharges it through the terminal exhaust port; when the branch air duct airflow merges into the main air duct at an approximately vertical angle, the two airflows collide at the intersection interface to generate turbulent vortexes, forming a local high-pressure area. This phenomenon causes a pressure gradient field that increases along the axial direction of the main air duct. This phenomenon significantly reduces the exhaust efficiency of the terminal branch air duct, forcing the corresponding inverter to increase the exhaust fan power to maintain heat dissipation, ultimately leading to an abnormal increase in equipment energy consumption and accelerated thermal aging of core components. Summary of the invention

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

[0005] The technical solution of the present invention is: a high-voltage frequency conversion room exhaust and heat dissipation device, comprising: An exhaust pipe, wherein the exhaust pipe is fixedly connected to and communicates with two symmetrically distributed end branch pipes, two symmetrically distributed middle branch pipes and two symmetrically distributed first branch pipes, and the exhaust pipe is provided with an exhaust port, and the distances between the end branch pipe, the middle branch pipe and the first branch pipe and the exhaust port are gradually reduced; Two symmetrically distributed main guide plates are both arranged in the exhaust duct, the middle branch pipe corresponds to the middle part of the main guide plate, and two symmetrically distributed auxiliary guide plates are arranged in the exhaust duct, the first branch pipe corresponds to the middle part of the auxiliary guide plate, and the main guide plate and the auxiliary guide plate are used to divide the exhaust duct into multiple flow channels.

[0006] Furthermore, the symmetry planes of the two main guide plates, the symmetry planes of the two auxiliary guide plates and the symmetry plane of the exhaust duct are coplanar, the distance between the symmetry planes of the main guide plate and the exhaust duct is smaller than the distance between the symmetry planes of the auxiliary guide plate and the exhaust duct, and the side of the main guide plate close to the exhaust port is located between the two auxiliary guide plates.

[0007] Furthermore, the main guide plate and the auxiliary guide plate are both provided with guide parts at positions away from the exhaust port, the guide part on the main guide plate is located between the last branch pipe and the middle branch pipe, and the guide part on the auxiliary guide plate is located between the middle branch pipe and the first branch pipe, and the guide part is used to guide the airflow in the exhaust pipe.

[0008] Furthermore, guide blocks are fixedly connected to the positions of the main guide plate close to the adjacent middle branch pipe and the auxiliary guide plate close to the adjacent first branch pipe, and the guide blocks are used to guide the airflow in the exhaust pipe.

[0009] Furthermore, it also includes: An adjusting component is arranged in the exhaust duct and is used to adjust the distance between the two main guide plates and the two auxiliary guide plates. The adjusting component includes: A plurality of support rods are rotatably connected in the exhaust duct, and each of the main guide plate and the auxiliary guide plate corresponds to at least two support rods. The main guide plate and the auxiliary guide plate are both provided with swing frames, and the number of the swing frames is equal to the number of the support rods. The swing frames are rotatably connected to adjacent support rods, and a torsion spring is fixed between the swing frames and the adjacent support rods. The swing frames on the same main guide plate and the auxiliary guide plate are rotatably connected to a series rod.

[0010] Furthermore, it also includes: The fan is installed in the exhaust duct near the end branch pipe, and is used to speed up the flow rate of the air flow in the exhaust duct.

[0011] Furthermore, wind shields are fixedly connected to the opposing sides of the two main guide plates near the fans through brackets, and the distance between the two wind shields gradually decreases in the direction from the first branch pipe to the last branch pipe.

[0012] Furthermore, it also includes: An electric push rod is installed on the exhaust pipe, the telescopic end of the electric push rod passes through the exhaust pipe and is fixedly connected to a connecting frame, and the main guide plate and the auxiliary guide plate are both slidably connected to the connecting frame; Four sealing strips are all sealingly and slidably connected to the exhaust duct, the main guide plate and the auxiliary guide plate are sealingly and slidably connected to adjacent sealing strips, and the main guide plate and the auxiliary guide plate are limitedly, slidably and rotatably connected to adjacent swing frames.

[0013] Furthermore, a heat exchange cavity is provided in each of the main guide plate and the auxiliary guide plate, and a liquid absorption sheet is fixedly connected in the heat exchange cavity and heat transfer medium is stored in the heat exchange cavity.

[0014] A high-voltage frequency conversion room exhaust and heat dissipation method is based on the above-mentioned high-voltage frequency conversion room exhaust and heat dissipation device, and the specific steps are as follows: Step 1: When exhausting and cooling the inverter in the inverter room, start the exhaust fan on the top of the inverter to transfer the heat generated during the operation of the inverter to the exhaust duct, and the heat flows forward along the flow channel separated by the main guide plate and the auxiliary guide plate in the exhaust duct, and is finally discharged to the outside through the exhaust port; Step 2: When the airflow in the middle branch pipe and the first branch pipe enters the exhaust pipe, it will blow the main guide plate and the auxiliary guide plate to move, so that the distance between the two main guide plates and the distance between the two auxiliary guide plates are reduced, so that the flow area of ​​each flow channel in the exhaust pipe is automatically adjusted according to the flow rate of the airflow in the middle branch pipe and the first branch pipe; Step 3: Set the power threshold of the exhaust fan. When the power of the six exhaust fans reaches the threshold, the power of the exhaust fan will no longer increase, and the fan will be started. The fan will assist the airflow in the terminal branch pipe and the middle branch pipe to enter the exhaust duct, speed up the airflow in the exhaust duct, reduce the air pressure in the exhaust duct, reduce the pressure difference on both sides of the exhaust fan on the top of the inverter, and improve the exhaust efficiency of the exhaust fan on the top of the inverter. When the exhaust fan power of the inverter is less than the set threshold, stop the fan. Step 4: While the fan is running, set the threshold of the temperature difference on both sides of the exhaust fan, and start the electric push rod when the set threshold is reached. The electric push rod controls the connection frame to move downward, and the connection frame drives the main guide plate and the auxiliary guide plate to extend out of the exhaust duct, and uses the heat pipe system in the main guide plate and the auxiliary guide plate to exchange heat with the air inside the inverter room, thereby increasing the temperature difference on both sides of the exhaust fan on the top of the inverter; Step 5: When the inverter or the fan stops, the electric push rod is used to control the connection frame, the main guide plate and the auxiliary guide plate to move up and reset.

[0015] The present invention divides the exhaust duct into multiple flow channels through the main guide plate and the auxiliary guide plate, thereby reducing the probability of airflow collision in the exhaust duct to form a local high-pressure area, thereby reducing the probability of a pressure gradient field appearing in the exhaust duct, and improving the exhaust efficiency of the terminal branch and the middle branch, thereby reducing the exhaust fan power of the inverter, reducing equipment energy consumption and slowing down the thermal aging rate of core components.

[0016] The main guide plate and the auxiliary guide plate are used to define the flow path in the exhaust duct, but the flow path of the airflow is not restricted, so that the gas in the exhaust duct can select the flow path according to the resistance and flow rate, thereby improving the applicability of the device.

[0017] The guide part is used to guide the airflow in the exhaust duct into a separate flow channel, thereby reducing the probability of collision between the airflows in the exhaust duct, and 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 airflow entering the exhaust duct, thereby reducing the degree of chaos when the airflow enters the exhaust duct, and reducing the flow resistance of the airflow in the branch pipe when entering the exhaust duct.

[0018] By changing the relative positions of the main guide plate and the auxiliary guide plate in the exhaust duct, the flow area of ​​each flow channel in the exhaust duct is changed. When the gas flow rates in the last branch pipe, the middle branch pipe and the first branch pipe are different, the flow area of ​​the corresponding flow channel can be adaptively adjusted to minimize the probability of local high pressure formed by air flow collision in the exhaust duct, improve the exhaust and heat dissipation efficiency of the inverter, and save the energy consumption of the inverter.

[0019] The main guide plate and the auxiliary guide plate are used to perform heat exchange between the gas in the exhaust duct and the air inside the frequency converter room, thereby 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

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the main guide plate and the auxiliary guide plate of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the main guide plate and the fan of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the main guide plate and the guide block of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the guide block and the swing frame of the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the support rod and the swing frame of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the main guide plate and the wind shield plate of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the auxiliary guide plate and the connecting frame of the present invention; Fig. 9 It is a three-dimensional structural cross-sectional view of the main guide plate and the sealing strip of the present invention.

[0021] Markings in the accompanying drawings: 1-exhaust duct, 101-end branch, 102-middle branch, 103-first branch, 104-exhaust port, 2-main drain plate, 201-drainage part, 3-auxiliary drain plate, 4-guide block, 5-support rod, 6-swing frame, 7-tandem rod, 8-fan, 9-wind shield, 10-electric push rod, 11-connecting frame, 12-sealing strip, 13-liquid absorbent sheet. DETAILED DESCRIPTION

[0022] The following will be combined with the attached Figure 1 To Attachment Fig. 9 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] A high-voltage frequency conversion room exhaust and heat dissipation device, please refer to Figure 1-Figure 4 , comprising: an exhaust pipe 1, the exhaust pipe 1 is fixedly connected and connected with two symmetrically distributed end branches 101, two symmetrically distributed middle branches 102 and two symmetrically distributed first branches 103, the exhaust pipe 1 is provided with an exhaust port 104, and the distances between the end branch pipe 101, the middle branch pipe 102 and the first branch pipe 103 and the exhaust port 104 are gradually reduced; two symmetrically distributed main guide plates 2 are both arranged in the exhaust pipe 1, the middle branch pipe 102 corresponds to the middle part of the main guide plate 2, and the exhaust pipe 1 is provided with a pair of There are two auxiliary guide plates 3 distributed on the main guide plate 2, the first branch pipe 103 corresponds to the middle part of the auxiliary guide plate 3, the main guide plate 2 and the auxiliary guide plate 3 are used to divide the exhaust duct 1 into multiple flow channels; the symmetry planes of the two main guide plates 2, the symmetry planes of the two auxiliary guide plates 3 and the symmetry plane of the exhaust duct 1 are coplanar, the distance between the symmetry planes of the main guide plate 2 and the exhaust duct 1 is smaller than the distance between the symmetry planes of the auxiliary guide plate 3 and the exhaust duct 1, and the side of the main guide plate 2 close to the exhaust port 104 is located between the two auxiliary guide plates 3.

[0024] The above scheme aims to solve the problem that the main air duct in the existing high-voltage frequency conversion room ventilation system forms a pressure gradient field due to the influx of airflow in multiple branch air ducts, which leads to increased energy consumption of the terminal inverter and accelerated thermal aging of core components; this scheme divides the exhaust duct 1 into multiple flow channels through the main guide plate 2 and the auxiliary guide plate 3, thereby reducing the probability of airflow collision in the exhaust duct 1 to form a local high-pressure area, thereby reducing the probability of a pressure gradient field in the exhaust duct 1, improving the exhaust efficiency of the terminal branch 101 and the middle branch 102, and thereby reducing the exhaust of the inverter. fan power, reduce equipment energy consumption and slow down the thermal aging rate of core components; when using the device to dissipate heat for the inverter, connect the end branch pipe 101, the middle branch pipe 102 and the first branch pipe 103 to the exhaust fan on the top of the inverter; 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 inverter during actual use; the exhaust port 104 is equipped with a screen to reduce the probability of insects and birds entering the exhaust duct 1; the exhaust port 104 faces obliquely downward to prevent rainwater from entering the exhaust duct 1.

[0025] The rear side of the main guide plate 2 is not in the middle position of the two terminal branch pipes 101, which makes it easy for the gas discharged from the two terminal branch pipes 101 to enter the above-mentioned flow channel after collision and mixing, thereby reducing the probability of mixing and collision between the gas entering the exhaust pipe 1 from the terminal branch pipe 101 and the gas discharged from the middle branch pipe 102; the connection relationship between the main guide plate 2 and the auxiliary guide plate 3 and the exhaust pipe 1 here can be regarded as a fixed connection; the front part of the main guide plate 2 is located between the two auxiliary guide plates 3, which is used to make the airflow discharged from the terminal branch pipe 101 and the middle branch pipe 102 mix and flow between the two auxiliary guide plates 3.

[0026] Please refer to Figure 3-Figure 5 The main guide plate 2 and the auxiliary guide plate 3 are both provided with guide parts 201 at positions away from the exhaust port 104. The guide part 201 on the main guide plate 2 is located between the end branch pipe 101 and the middle branch pipe 102, and the guide part 201 on the auxiliary guide plate 3 is located between the middle branch pipe 102 and the first branch pipe 103. The guide part 201 is used to guide the airflow in the exhaust duct 1; the main guide plate 2 near the adjacent middle branch pipe 102 and the auxiliary guide plate 3 near the adjacent first branch pipe 103 are both fixedly connected with guide blocks 4, and the guide blocks 4 are used to guide the airflow in the exhaust duct 1.

[0027] In the above scheme, the purpose is to use the guide part 201 to guide the airflow in the exhaust duct 1 into a separate flow channel, reduce the probability of collision between the airflows in the exhaust duct 1, and further reduce the probability of local high-pressure areas appearing in the exhaust duct 1; use the guide 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 of the airflow in the branch pipe when entering the exhaust duct 1; the front part of the guide block 4 is provided with an arc-shaped surface, and the rear part of the guide block 4 is provided with an inclined surface. The arc-shaped surface of the guide 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 guide block 4 is used to reduce the obstruction of the guide block 4 to the airflow behind it.

[0028] During the use of the high-voltage frequency converter cabinet in the high-voltage frequency converter room, the exhaust fan on the top of the frequency converter cabinet is turned on to continuously transport the hot air flow inside the frequency converter to the exhaust duct 1 and exhaust it to the outside through the exhaust port 104, so as to maintain the frequency converter in a normal temperature range during operation; the air flow in the two terminal 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 away 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 guide plates 2 or entering between the exhaust duct 1 and the main guide plate 2. However, since the gas will be impacted by the airflow in the middle branch pipe 102 during the process of flowing between the exhaust duct 1 and the main guide plate 2, a local high-pressure area will be formed with large flow resistance. Therefore, the gas at the end of the exhaust duct 1 will preferentially enter between the two main guide plates 2 and flow forward under the guidance of the guide portion 201 on the main guide plate 2. The main guide plate 2 is used to separate the airflow transported to the exhaust duct 1 by the middle branch pipe 102 from the airflow at the end of the exhaust duct 1, so that the airflow flowing forward between the two main guides will not be directly impacted by the airflow in the middle branch pipe 102, thereby reducing the resistance to gas flow in the exhaust duct 1.

[0029] The airflow flowing into the exhaust duct 1 from the middle branch pipe 102 contacts the side of the adjacent main guide plate 2, and flows forward along the side of the main guide plate 2 under the guidance of the arc-shaped surface on the guide block 4. At this time, the airflow has two flow paths: the gap between the main guide plate 2 and the adjacent auxiliary guide plate 3 and the gap between the auxiliary guide plate 3 and the exhaust duct 1. Since the airflow encounters little resistance when entering the gap between the main guide plate 2 and the adjacent auxiliary guide plate 3, the airflow in the middle branch pipe 102 will preferentially flow forward along the gap between the main guide plate 2 and the adjacent auxiliary guide plate 3 after entering the exhaust duct 1. Then the airflow enters between the two auxiliary guide plates 3 and merges with the airflow flowing forward between the two main guide plates 2. Since the flow directions of the two airflows are consistent at this time, the two merge and no turbulent vortex will be generated. vortex, will not affect its normal flow; if the gas flow in the middle branch pipe 102 is large, and the gap between the main guide plate 2 and the adjacent auxiliary guide plate 3 is not enough 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 by the collision of the gas in the first branch pipe 103 and the gas in the exhaust pipe 1, part of the gas in the middle branch pipe 102 will be diverted to the gap between the auxiliary guide plate 3 and the exhaust pipe 1. The same is true when the gas flow in the last branch pipe 101 is large; in this way, the main guide plate 2 and the auxiliary guide plate 3 are used to define the flow channel in the exhaust pipe 1, but the flow path of the airflow is not restricted, so that the gas in the exhaust pipe 1 can select the flow path according to the resistance and flow, thereby improving the applicability of the device.

[0030] The airflow flowing into the exhaust duct 1 from the first branch pipe 103 contacts the side of the adjacent auxiliary guide plate 3, and flows forward along the side of the auxiliary guide plate 3 under the guidance of the arc-shaped surface on the guide block 4, and finally mixes with the airflow between the two auxiliary guide plates 3 when flowing to the front side of the auxiliary guide plate 3, and is discharged together through the exhaust port 104 until the inverter is shut down and the fan on the top of the inverter stops running.

[0031] Please refer to Figure 3-Figure 8 , also includes: an adjustment component, which is arranged in the exhaust duct 1 and is used to adjust the distance between the two main guide plates 2 and the two auxiliary guide plates 3. The adjustment component includes: a plurality of support rods 5, which are rotatably connected in the exhaust duct 1, and each main guide plate 2 and auxiliary guide plate 3 corresponds to at least two support rods 5. The main guide plate 2 and the auxiliary guide plate 3 are both provided with swing frames 6, and the number of swing frames 6 is equal to that of the support rods 5. The swing frames 6 are rotatably connected to adjacent support rods 5. A torsion spring is fixed between the swing frames 6 and the adjacent support rods 5. The swing frames 6 on the same main guide plate 2 and the auxiliary guide plate 3 are rotatably connected to a series rod 7.

[0032] In the above scheme, the main guide plate 2 and the auxiliary guide plate 3 are intended to be able to move in the exhaust duct 1, thereby changing the flow area of ​​each flow channel in the exhaust duct 1. When the gas flow rates in the last branch 101, the middle branch 102 and the first branch 103 are different, the flow area of ​​the corresponding flow channel can be adaptively adjusted to minimize the probability of airflow collision in the exhaust duct 1 to form local high pressure, improve the exhaust and heat dissipation efficiency of the inverter, and save the energy consumption of the inverter; the series rod 7 is used to connect the two swing frames 6 on the same main guide plate 2 or the same auxiliary guide plate 3 in series, so that the two swing frames 6 can be connected at the same time. The main guide plate 2 and the auxiliary guide plate 3 are swung step by step, so that the main guide plate 2 or the auxiliary guide plate 3 can maintain the initial direction while moving horizontally; the connection state of the main guide plate 2 and the auxiliary guide plate 3 with the exhaust duct 1 here can be regarded as a fitted sliding; initially, the main guide plate 2 and the auxiliary guide plate 3 can both move in the left and right directions, and the main guide plate 2 and the auxiliary guide plate 3 are both in the middle position of their movable range, and the elastic coefficient of the torsion spring on the swing frame 6 is determined according to the exhaust fan power at the top of the inverter, so that when the exhaust fans of the six inverters are all running at rated power, the positions of the main guide plate 2 and the auxiliary guide plate 3 can remain unchanged at the initial position.

[0033] When the device is used to exhaust and dissipate heat for the inverter, since different inverters control different electrical components, different inverters generate heat at different rates during operation. The inverter can adjust the power of its top exhaust fan according to its own heat generation to achieve energy saving. Therefore, the fan on the top of the inverter usually does not run at rated power. With the start-up of the exhaust fan on the top of the inverter, the hot air flows inside the six inverters are respectively transported to the exhaust duct 1 through the adjacent end branch pipe 101, middle branch pipe 102 or first branch pipe 103. When the gas entering the exhaust duct 1 from the end branch pipe 101 flows between the two main guide plates 2, it will exert pressure on the main guide plate 2 away from the symmetrical 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 guide plate 2. The impact force of the main guide plate 2 on the airflow and pressure, and drives the adjacent swing frame 6 and series rod 7 to move, and twists the torsion spring of the swing frame 6, so that the gap between the main guide plate 2 and the exhaust pipe 1 changes, until the pressure of the gas in the end branch pipe 101, 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 on the main guide plate 2 are balanced, and the main guide plate 2 stops moving; the airflow in the first branch pipe 103 impacts the adjacent auxiliary guide plate 3 in the same way, and the gap between the two auxiliary guide plates 3 is adjusted automatically according to the pressure of the internal gas and the impact force of the gas in the first branch pipe 103, so as to adjust the flow area of ​​each flow channel automatically, reduce the influence of the flow area on the airflow in the exhaust pipe 1, improve the exhaust efficiency of the end branch pipe 101, the middle branch pipe 102 and the first branch pipe 103, and then reduce the power of the exhaust fan on the inverter, so as to achieve the purpose of energy saving.

[0034] When the frequency converter is shut down, the main guide plates 2 and the auxiliary guide plates 3 move under the action of the torsion springs on the adjacent support rods 5, so that the two main guide plates 2 and the two auxiliary guide plates 3 are reset.

[0035] Please refer to Figure 2 , Figure 3 and Figure 7 , and also includes: a fan 8, installed in the exhaust duct 1 near the last branch pipe 101, the fan 8 is used to accelerate the flow rate of the airflow in the exhaust duct 1; the two main guide plates 2 are fixed with wind shields 9 on the opposite sides near the fan 8 through brackets, and the distance between the two wind shields 9 gradually decreases in the direction from the first branch pipe 103 to the last branch pipe 101.

[0036] The above scheme aims to solve the problem that when all the inverters in the existing high-voltage frequency conversion room are running at high power (that is, the heat generated by the inverter per unit time is the largest at this time), the heat generation is high. At this time, the inverter increases the power of the exhaust fan on the top, but as the power of the exhaust fan increases, the air pressure in the main air duct increases synchronously, which increases the pressure difference on both sides of the exhaust fan on the top of the inverter. As the pressure difference increases, the increase in the exhaust fan power reduces the improvement in its exhaust efficiency. In this state, the energy utilization rate of the exhaust fan is low when it is working; when the inverter cluster in the frequency conversion room is running at high power, the fan 8 is used to increase the flow rate of the gas in the exhaust duct 1 to improve The exhaust and heat dissipation efficiency of the inverter reduces the probability of the overall pressure increase in the exhaust duct 1 when all the inverter exhaust fans are running at high power, and further improves the exhaust efficiency of the inverter top exhaust fan and the effective utilization rate of energy; the fan 8 is located between the main guide 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 on the top of the inverter cabinet corresponding to the end branch pipe 101, thereby improving the exhaust and heat dissipation efficiency of the inverter 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 shield 9 and the adjacent main guide plate 2.

[0037] When the frequency converter cabinet cluster in the high-voltage frequency converter room operates at high power, the heat generation rate of the frequency converter cabinet is fast. The workers set the threshold value according to the relationship curve between the exhaust fan power and the exhaust efficiency. After the power of the six exhaust fans reaches the threshold value, the power of the exhaust fan is no longer increased, but the fan 8 is started. The fan 8 transports the gas at its rear to the front, and generates a pressure difference between the front and rear sides, and draws the airflow in the terminal branch pipe 101 into the exhaust duct 1, thereby accelerating the rate at which the airflow in the terminal branch pipe 101 enters the exhaust duct 1; the fan 8 blows the airflow at the end of the exhaust duct 1 to between the two main guide plates 2, so that part of the airflow between the two main guide plates 2 flows forward through the two wind shields 9, and the other part flows forward through the wind shield 9 and the adjacent main guide plate 2.

[0038] When the airflow passes between the wind shield plate 9 and the adjacent main guide plate 2, the airflow generates a component force on the wind shield plate 9 close to the symmetric plane of the exhaust pipe 1, so that the wind shield plate 9 drives the adjacent main guide plate 2 to move, and the main guide 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 guide plates 2 becomes the minimum state, thus reducing the flow area between the two main guide plates 2 to increase the flow rate of the airflow between the two main guide plates 2. Based on the principle that the pressure is small at a position with high flow rate, the main guide plate 2 is A pressure difference is generated at the gap between the guide plate 2 and the auxiliary guide plate 3, which causes the airflow entering the exhaust duct 1 from the middle branch pipe 102 to enter between the two auxiliary guide plates 3 and flow quickly, thereby accelerating the exhaust efficiency of the middle branch pipe 102. In this way, the fan 8 is used to accelerate the flow rate of the gas in the exhaust duct 1, and at the same time, enhance the exhaust efficiency of the inverter corresponding to the end and middle of the exhaust duct 1, so as to maintain the stability of the exhaust efficiency of the inverter. When the power of the inverter exhaust fan drops below the threshold or the inverter is shut down, the fan 8 is stopped.

[0039] Please refer to Figure 1-Figure 3 , Figure 6 , Figure 8 and Fig. 9 , and also includes: an electric push rod 10, which is installed on the exhaust pipe 1, and the telescopic end of the electric push rod 10 passes through the exhaust pipe 1 and is fixedly connected to the connecting frame 11, and the main guide plate 2 and the auxiliary guide plate 3 are both slidably connected to the connecting frame 11; four sealing strips 12, which are all sealed and slidably connected to the exhaust pipe 1, and the main guide plate 2 and the auxiliary guide plate 3 are respectively sealed and slidably connected to the adjacent sealing strips 12, and the main guide plate 2 and the auxiliary guide plate 3 are respectively limitedly slidably and rotatably connected to the adjacent swing frame 6; a heat exchange cavity is provided in the main guide plate 2 and the auxiliary guide plate 3, and a liquid absorption sheet 13 is fixedly connected in the heat exchange cavity and a heat transfer medium is stored.

[0040] In the above scheme, the ventilation system used in the existing high-voltage frequency conversion room is intended to solve the problem that after the frequency converter is used at high power for a long time, heat accumulates in the ventilation duct, resulting in a decrease in the temperature difference between the two sides of the exhaust fan on the top of the frequency converter, resulting in low heat dissipation efficiency of the frequency converter and increased energy consumption of the frequency converter; the main guide plate 2 and the auxiliary guide plate 3 are used to perform heat exchange between the gas in the exhaust duct 1 and the air inside the frequency conversion room, so as to 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 at low pressure (the heat here refers to the heat dissipated during the normal operation of the frequency converter, that is, 50 ℃-70℃) vaporizes and liquefies when cooled to form a heat pipe system. Acetone is selected here. The number of heat exchange chambers is determined by the length of the main guide plate 2 and the auxiliary guide plate 3. Here, there are several heat exchange chambers distributed at equal intervals, and the heat exchange chamber is in a state lower than the atmospheric pressure. The pressure here is determined according to the temperature change range of the inverter during operation and the boiling point of the heat transfer medium. When the inverter is operating normally, the heat dissipated into the exhaust pipe 1 can vaporize the heat transfer medium (acetone); the absorbent sheet 13 can be made of a material such as a wire mesh, metal powder, etc. that can cause the liquid to be subjected to capillary action. Here, the absorbent sheet 13 is sintered by metal powder (copper powder).

[0041] During the period when the inverter is continuously running at high power and the fan 8 is running, the heat accumulation in the exhaust duct 1 causes the inverter heat dissipation efficiency to be low. The worker judges the heat dissipation efficiency of the exhaust fan at this time according to the temperature difference on both sides of the exhaust fan and sets a threshold. After the temperature difference on both sides of the exhaust fan reaches the set threshold, the electric push rod 10 is started to extend the telescopic end of the electric push rod 10 and drive the connecting frame 11 to move downward. The connecting frame 11 drives the main guide plate 2 and the auxiliary guide plate 3 to move downward, so that the lower sides of the main guide plate 2 and the auxiliary guide plate 3 protrude the adjacent blocking strips 12. At this time, the lower part of the heat exchange cavity in the main guide plate 2 and the auxiliary guide plate 3 extends out of the exhaust duct 1 and contacts the indoor environment of the inverter. Then the part of the heat exchange cavity located in the exhaust duct 1 ( The acetone in the heat exchange chamber (hereinafter referred to as the middle and upper part of the heat exchange chamber) is vaporized, so that a pressure difference is generated between the upper and lower parts of the heat exchange chamber. At this time, the vaporized acetone enters the part of the heat exchange chamber extending outside the exhaust pipe 1 (hereinafter 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 in the frequency conversion chamber in the lower part of the heat exchange chamber and condenses into liquid. It flows upward again under the capillary action of the liquid absorbing sheet 13, so that the acetone in the heat exchange chamber reciprocates in phase change circulation, dissipates the heat accumulated in the exhaust pipe 1 to the frequency conversion chamber, reduces the temperature in the exhaust pipe 1, and increases the temperature difference between the two sides of the exhaust fan on the top of the inverter, thereby improving the heat dissipation efficiency of the inverter and reducing the energy consumption of the inverter.

[0042] When the inverter stops or the fan 8 stops, the electric push rod 10 controls the connecting frame 11 to move upward, and the connecting frame 11 drives the main guide plate 2 and the auxiliary guide plate 3 to move upward, so that the lower sides of the main guide plate 2 and the auxiliary guide plate 3 are respectively coplanar with the lower sides of the adjacent blocking strips 12, so that the heat exchange chamber is completely retracted into the exhaust pipe 1 and reset.

[0043] A high-voltage frequency conversion room exhaust and heat dissipation method, please refer to Figure 1-Figure 9 Based on the above-mentioned high-voltage frequency conversion room exhaust and heat dissipation device, the specific steps are as follows: Step 1: When exhausting and cooling the inverter in the inverter room, start the exhaust fan on the top of the inverter to transport the heat generated during the operation of the inverter to the exhaust duct 1, and flow forward along the flow channel separated by the main guide plate 2 and the auxiliary guide plate 3 in the exhaust duct 1, and finally discharge to the outside through the exhaust port 104; Step 2: When the airflow in the middle branch pipe 102 and the first branch pipe 103 enters the exhaust pipe 1, it will blow the main guide plate 2 and the auxiliary guide plate 3 to move, so that the distance between the two main guide plates 2 and the distance between the two auxiliary guide plates 3 are reduced, so that the flow area of ​​each flow channel in the exhaust pipe 1 is automatically adjusted according to the flow rate of the airflow in the middle branch pipe 102 and the first branch pipe 103; Step 3: Set the power threshold of the exhaust fan. After the power of the six exhaust fans reaches the threshold, the power of the exhaust fan will no longer increase, and the fan 8 will be started. The fan 8 assists the airflow in the terminal branch pipe 101 and the middle branch pipe 102 to enter the exhaust pipe 1, speed up the flow rate of the airflow in the exhaust pipe 1, reduce the air pressure in the exhaust pipe 1, reduce the pressure difference on both sides of the exhaust fan on the top of the inverter, and improve the exhaust efficiency of the exhaust fan on the top of the inverter. When the exhaust fan power of the inverter is less than the set threshold, stop the fan 8; Step 4: While the fan 8 is running, a threshold value of the temperature difference on both sides of the exhaust fan is set, and the electric push rod 10 is started after the set threshold value is reached. The electric push rod 10 controls the connection frame 11 to move downward, and the connection frame 11 drives the main guide plate 2 and the auxiliary guide plate 3 to extend out of the exhaust pipe 1, and the heat pipe system in the main guide plate 2 and the auxiliary guide plate 3 is used to exchange heat with the air inside the frequency conversion room, thereby increasing the temperature difference on both sides of the exhaust fan on the top of the frequency converter; Step 5: When the frequency converter or the fan 8 stops, the electric push rod 10 controls the connecting frame 11, the main guide plate 2 and the auxiliary guide plate 3 to move upward and reset.

[0044] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage frequency conversion room exhaust and heat dissipation device, characterized in that it includes: An exhaust pipe (1), wherein the exhaust pipe (1) is fixedly connected to and communicates with two symmetrically distributed end branch pipes (101), two symmetrically distributed middle branch pipes (102) and two symmetrically distributed first branch pipes (103), the exhaust pipe (1) is provided with an exhaust port (104), and the distances between the end branch pipe (101), the middle branch pipe (102) and the first branch pipe (103) and the exhaust port (104) decrease step by step; Two symmetrically distributed main flow guide plates (2) are both arranged in the exhaust duct (1), the middle branch pipe (102) corresponds to the middle part of the main flow guide plate (2), and two symmetrically distributed auxiliary flow guide plates (3) are arranged in the exhaust duct (1), the first branch pipe (103) corresponds to the middle part of the auxiliary flow guide plate (3), and the main flow guide plate (2) and the auxiliary flow guide plate (3) are used to divide the exhaust duct (1) into a plurality of flow channels.

2. The high-voltage frequency conversion room exhaust and heat dissipation device according to claim 1 is characterized in that: The symmetry planes of the two main flow guide plates (2), the symmetry planes of the two auxiliary flow guide plates (3) and the symmetry plane of the exhaust pipe (1) are coplanar, the distance between the symmetry planes of the main flow guide plates (2) and the exhaust pipe (1) is smaller than the distance between the symmetry planes of the auxiliary flow guide plates (3) and the exhaust pipe (1), and a side of the main flow guide plate (2) close to the exhaust port (104) is located between the two auxiliary flow guide plates (3).

3. The high-voltage frequency conversion room exhaust and heat dissipation device according to claim 2 is characterized in that: The main flow guide plate (2) and the auxiliary flow guide plate (3) are both provided with a flow guide portion (201) at a position away from the exhaust port (104); the flow guide portion (201) on the main flow guide plate (2) is located between the end branch pipe (101) and the middle branch pipe (102); the flow guide portion (201) on the auxiliary flow guide plate (3) is located between the middle branch pipe (102) and the first branch pipe (103); and the flow guide portion (201) is used to guide the airflow in the exhaust pipe (1).

4. The high-voltage frequency conversion room exhaust and heat dissipation device according to claim 3 is characterized in that: A guide block (4) is fixedly connected to the main guide plate (2) at a position close to the adjacent middle branch pipe (102) and to the auxiliary guide plate (3) at a position close to the adjacent first branch pipe (103). The guide block (4) is used to guide the airflow in the exhaust pipe (1).

5. The high-voltage frequency conversion room exhaust and heat dissipation device according to claim 4 is characterized in that: include: An adjustment component is arranged in the exhaust pipe (1) and is used to adjust the distance between the two main guide plates (2) and the two auxiliary guide plates (3), and the adjustment component comprises: A plurality of support rods (5) are rotatably connected in the exhaust pipe (1), and each of the main guide plate (2) and the auxiliary guide plate (3) corresponds to at least two support rods (5). The main guide plate (2) and the auxiliary guide plate (3) are both provided with swing frames (6), the number of the swing frames (6) is equal to the number of the support rods (5), the swing frames (6) are rotatably connected to adjacent support rods (5), a torsion spring is fixedly connected between the swing frames (6) and the adjacent support rods (5), and the swing frames (6) on the same main guide plate (2) and the auxiliary guide plate (3) are rotatably connected to a series rod (7).

6. The high-voltage frequency conversion room exhaust and heat dissipation device according to claim 5 is characterized in that: include: A fan (8) is installed in the exhaust pipe (1) at a position close to the terminal branch pipe (101), and the fan (8) is used to increase the flow rate of the air flow in the exhaust pipe (1).

7. The high-voltage frequency conversion room exhaust and heat dissipation device according to claim 6 is characterized in that: Wind shielding plates (9) are fixedly connected via brackets to the positions of the fans (8) at the opposite sides of the two main guide plates (2), and the distance between the two wind shielding plates (9) gradually decreases in the direction from the first branch pipe (103) to the last branch pipe (101).

8. The high-voltage frequency conversion room exhaust and heat dissipation device according to claim 7 is characterized in that: include: An electric push rod (10) is mounted on the exhaust pipe (1), the telescopic end of the electric push rod (10) passes through the exhaust pipe (1) and is fixedly connected to a connecting frame (11), and the main guide plate (2) and the auxiliary guide plate (3) are both slidably connected to the connecting frame (11); The four sealing strips (12) are all sealingly slidably connected to the exhaust pipe (1); the main guide plate (2) and the auxiliary guide plate (3) are respectively sealingly slidably connected to the adjacent sealing strips (12); and the main guide plate (2) and the auxiliary guide plate (3) are respectively limitedly slidably and rotatably connected to the adjacent swing frame (6).

9. The high-voltage frequency conversion room exhaust and heat dissipation device according to claim 8 is characterized in that: The main flow guide plate (2) and the auxiliary flow guide plate (3) are both provided with a heat exchange cavity, and a liquid absorption sheet (13) is fixedly connected to the heat exchange cavity and heat transfer medium is stored therein.

10. A method for exhausting and cooling high-voltage frequency conversion room, according to the device for exhausting and cooling high-voltage frequency conversion room according to claim 9, characterized in that: The specific steps are as follows: Step 1: When exhausting and cooling the inverter in the inverter room, start the exhaust fan on the top of the inverter to transport the heat generated during the operation of the inverter into the exhaust duct (1), and flow forward along the flow channel separated by the main guide plate (2) and the auxiliary guide plate (3) in the exhaust duct (1), and finally discharge to the outside through the exhaust port (104); Step 2: When the airflow in the middle branch pipe (102) and the first branch pipe (103) enters the exhaust pipe (1), it blows the main guide plate (2) and the auxiliary guide plate (3) to move, so that the distance between the two main guide plates (2) and the distance between the two auxiliary guide plates (3) are reduced, so that the flow area of ​​each flow channel in the exhaust pipe (1) is automatically adjusted according to the flow rate of the airflow in the middle branch pipe (102) and the first branch pipe (103); Step 3: Setting a power threshold of the exhaust fans. After the power of the six exhaust fans reaches the threshold, the power of the exhaust fans will no longer increase, and the fan (8) will be started. The fan (8) will assist the airflow in the terminal branch pipe (101) and the middle branch pipe (102) to enter the exhaust pipe (1), thereby increasing the flow rate of the airflow in the exhaust pipe (1), reducing the air pressure in the exhaust pipe (1), reducing the pressure difference on both sides of the exhaust fan at the top of the inverter, and improving the exhaust efficiency of the exhaust fan at the top of the inverter. When the power of the exhaust fan of the inverter is less than the set threshold, the fan (8) will be stopped. Step 4: while the fan (8) is running, a threshold value of the temperature difference between the two sides of the exhaust fan is set, and when the set threshold value is reached, the electric push rod (10) is started, and the connecting frame (11) is controlled to move downward by the electric push rod (10), and the connecting frame (11) drives the main guide plate (2) and the auxiliary guide plate (3) to extend out of the exhaust duct (1), and utilizes the heat pipe system in the main guide plate (2) and the auxiliary guide plate (3) to exchange heat with the air inside the frequency conversion room, thereby increasing the temperature difference between the two sides of the exhaust fan at the top of the frequency converter; Step 5: When the frequency converter is stopped or the fan (8) is stopped, the connecting frame (11), the main guide plate (2) and the auxiliary guide plate (3) are controlled by the electric push rod (10) to move upward and reset.

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