An Optimization Device for the Heat Dissipation of the Linear Motor at the Bottom of a Subway Train Based on Flow Control

Abstract

The present invention provides a heat dissipation optimization device for the linear motor at the bottom of a subway train based on flow control, comprising a hoisting bracket, a fixing seat, and a guide plate. The hoisting bracket is installed under the bottom of the train, and the hoisting bracket installs the guide plate through the fixing seat so that the guide plate is at a preset angle with the centerline of the train. The guide plate is used to destroy the boundary layer on the outside of the bottom of the train when the train is running, so that the airflow flows to the area where the linear motor is located, thereby enhancing convective heat exchange. The present invention does not require modification of the structure of the linear motor itself. At low manufacturing, installation, and maintenance costs, it optimizes the heat dissipation of each linear motor at the bottom of the subway train. Through reasonable flow control, high-speed and low-temperature airflow is introduced into the bottom area of the train, which can effectively reduce the overall temperature rise of each linear motor in the train. The structure and installation method are simple and feasible, the raw materials of each component are easy to obtain, and the inspection and maintenance costs are low. It provides conditions for heat dissipation of unenclosed bottom equipment structures including subway trains and ordinary trains.

Description

Technical Field

[0001] The present invention relates to the technical field of motor cooling, and in particular to a heat dissipation optimization device for a linear motor at the bottom of a subway train based on flow control. Background Art

[0002] With the development of urbanization, the demand for urban rail transit capacity has also increased. The long-term, high-load operation of linear motor subway trains poses a serious heat dissipation problem for the linear motors, threatening the smooth and safe operation of subway trains. Therefore, it is necessary to design a subway train underbody heat dissipation optimization device to control the underbody flow and enhance the heat dissipation of the linear motors.

[0003] Currently, there are several main methods for optimizing the heat dissipation of linear motors. The first is to install a heat dissipation device with an S-shaped heat pipe on the core to dissipate heat from multiple cores. The second is to add a cooling shell and cooling channels to the outside of the core to dissipate heat from the core using water cooling. The third is to install a cooling air duct on the linear motor to provide forced air cooling, and rely on a cooling fan to blow air to dissipate heat from the linear motor, as shown in the Chinese utility model patent with announcement number CN215267907U. All three of the above methods require structural modifications to the linear motor itself, resulting in high manufacturing, installation, and maintenance costs. Therefore, designing an effective heat dissipation solution that is easy to disassemble and install, low-cost, and of great significance for enhancing the heat dissipation of the linear motor at the bottom of subway trains. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies in the above-mentioned background technology and to provide an effective heat dissipation solution for subway train linear motors that is easy to assemble and disassemble and has low cost.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a heat dissipation optimization device for the linear motor at the bottom of a subway train based on flow control, including a heat dissipation optimization device for the linear motor at the bottom of a subway train based on flow control, characterized in that it includes a lifting bracket, a fixing seat, and a guide plate. The lifting bracket is installed under the bottom of the train. The lifting bracket installs the guide plate through the fixing seat so that the guide plate is at a preset angle with the center line of the train. The guide plate is used to destroy the boundary layer on the outside of the bottom of the train when the train is running, so that the airflow flows toward the area where the linear motor is located, thereby enhancing convective heat exchange.

[0006] Furthermore, the top of the lifting bracket is detachably connected to the T-slot on the lower surface of the train floor, the bottom of the lifting bracket is detachably connected to the fixing seat, and the fixing seat is detachably connected to the top of the guide plate.

[0007] Furthermore, the hanging bracket includes a first mounting plate located at the top, a second mounting plate located at the bottom, and a column connecting the first mounting plate and the second mounting plate.

[0008] Furthermore, a first mounting hole is provided on the first mounting plate, the first mounting hole corresponds to the T-slot and is detachably connected by a T-bolt and a nut, a second mounting hole is provided on the second mounting plate, a third mounting hole and a fourth mounting hole are provided on the fixing seat, the third mounting hole corresponds to the second mounting hole and is detachably connected by a connecting bolt and a nut, and the fourth mounting hole corresponds to the through hole reserved in the guide plate and is detachably connected by a connecting bolt and a nut.

[0009] Furthermore, the fixing seat includes two L-shaped profiles arranged opposite to each other, the vertical sides of the L-shaped profiles are respectively vertically attached to the two sides of the guide plate, and the fourth mounting hole is aligned with the through hole of the guide plate, the L-shaped profile is attached to the lower surface of the second mounting plate, and the third mounting hole is aligned with the second mounting hole.

[0010] Furthermore, at least two of the hanging brackets are relatively parallel and provided, and a plurality of third mounting holes are provided on the fixing seat, which are respectively fixed at different positions of the second mounting holes of the hanging brackets, so that the guide plate forms different inclination angles.

[0011] Furthermore, the angle between each guide plate and the train running direction is 0-60°.

[0012] Furthermore, the second mounting hole and the third mounting hole are both waist-shaped holes to adaptively adjust the position of the connecting bolt.

[0013] Furthermore, the guide plate is made of elastic material, which ensures structural rigidity and can be broken by a wheel accidentally falling off the track, without causing safety accidents such as train derailment.

[0014] Furthermore, the guide plates are kept parallel to each other, and 1-2 groups of guide plates are arranged at diagonal positions at the connection between the carriages, and their angles are consistent with the driving direction of the vehicle.

[0015] The above solution of the present invention has the following beneficial effects:

[0016] The heat dissipation optimization device for the linear motor at the bottom of a subway train based on flow control provided by the present invention can enable the guide plate to be directly installed on the bottom of the train through the arrangement of a lifting bracket, a fixing seat, etc., so there is no need to modify the structure of the linear motor itself. At low manufacturing, installation and maintenance costs, the heat dissipation of each linear motor at the bottom of the subway train is optimized. Through reasonable flow control, high-speed and low-temperature airflow is introduced into the bottom area of the vehicle, which can effectively reduce the overall temperature rise of each linear motor of the train. The structure and installation method are simple and feasible, the raw materials of each component are easy to obtain, and the inspection and maintenance costs are low. Conditions are provided for the heat dissipation of the structure of uncovered bottom equipment including subway trains and conventional trains. In addition, when the guide plate falls and invades the line, it basically will not cause safety accidents such as train derailment.

[0017] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a bottom view of the overall structure of the present invention;

[0020] Figure 3 It is a side view of the overall structure of the present invention;

[0021] Figure 4 is a schematic diagram of a subway train of the present invention;

[0022] Figure 5 This is a schematic diagram of the installation position of the diversion component of the present invention;

[0023] Figure 6 This is a diagram of the numerical simulation model in the present invention;

[0024] Figure 7 It is the percentage of temperature rise reduction of the linear motor in different optimization schemes in the present invention.

[0025] [Description of Reference Numerals]

[0026] 1-Lifting bracket; 2-Fixed seat; 3-Deflector; 4-T-slot; 5-Linear motor; 6-T-bolt; 7-First mounting plate; 8-Second mounting plate; 9-Post; 10-Second mounting hole; 11-Connecting bolt; 12-Third mounting hole; 13-Train. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to a locking connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] like Figure 1-Figure 3 As shown, an embodiment of the present invention provides a heat dissipation optimization device for a linear motor at the bottom of a subway train based on flow control, which is composed of multiple groups of guide assemblies arranged at the bottom of the train. Each group of guide assemblies includes a hanging bracket 1, a fixing seat 2, and a guide plate 3.

[0031] The mounting bracket 1 is connected to the vehicle floor. Specifically, in this embodiment, the top of the mounting bracket 1 is secured to the T-slot 4 on the vehicle floor. Simultaneously, the bottom of the mounting bracket 1 is secured to the top of the deflector 3, ensuring that the deflector 3 is stably mounted and suspended beneath the vehicle floor. After installation, the deflector 3 forms a predetermined angle with the centerline of the train 13. Therefore, during travel, the deflector 3 allows airflow to flow toward the area where the linear motor 5 is located, enhancing convective heat transfer and providing a greater cooling effect in the area where the linear motor 5 is located.

[0032] In this embodiment, the top of the suspension bracket 1 is detachably connected to the T-slot 4 on the vehicle's underbody via a T-bolt 6. The T-bolt 6 can be inserted directly into the T-slot 4, passed through the first mounting hole on the top of the suspension bracket 1, and then secured with a nut. Therefore, the deflector assembly can be installed directly using the inherent structure of the vehicle's underbody, eliminating the need to modify the linear motor 5 itself, reducing operational costs. Furthermore, the detachable connection facilitates installation, replacement, and maintenance.

[0033] In this embodiment, the suspension bracket 1 includes a first mounting plate 7 at the top, a second mounting plate 8 at the bottom, and a column 9 connecting the first and second mounting plates 7 and 8. A first mounting hole is defined in the first mounting plate 7 for inserting and securing the T-bolt 6. A second mounting hole 10 is defined in the second mounting plate 8 for mounting the deflector 3.

[0034] The deflector 3 is made of a flexible rubber material and is connected to the hanging bracket 1 via a fixing base 2. Specifically, in this embodiment, the fixing base 2 is an L-shaped member. Two L-shaped members are positioned opposite each other, with their vertical sides perpendicularly attached to the sides of the deflector 3. These two L-shaped members are secured together by connecting bolts 11 and nuts to hold the deflector 3 in place. Simultaneously, the horizontal sides of the L-shaped members are attached to the lower surface of the second mounting plate 8 and secured thereto by connecting bolts 11 and nuts. This allows the deflector 3 to be fixed to the bottom of the hanging bracket 1, making installation and removal equally convenient.

[0035] In this embodiment, a third mounting hole 12 is defined on the horizontal side of the fixing base 2. This third mounting hole 12 aligns with the second mounting hole 10, allowing the fixing base 2 to be secured to the suspension bracket 1 via connecting bolts 11. A fourth mounting hole is defined on the vertical side of the fixing base 2, and a corresponding through-hole is also defined on the deflector 3 to secure the deflector 3. Therefore, the deflector 3 is also mounted using a detachable bolt connection, making installation, replacement, and maintenance very convenient.

[0036] At the same time Figure 4-Figure 5 As shown, in this embodiment, the installation angle of the deflector 3 is adjustable to adjust and adapt to the different operating conditions of the subway train 13, thereby optimizing the heat dissipation effect of the linear motor 5. Specifically, in this embodiment, two sets of relatively parallel lifting brackets 1 are arranged parallel to the central axis of the train 13. Multiple third mounting holes 12 are provided on the fixing base 2, and are respectively fixed to different positions of the second mounting holes 10 of the two lifting brackets 1. This allows the deflector 3 to form different tilt angles. The optimization of this angle can be demonstrated through numerical simulation.

[0037] It should be noted that in order to ensure that the guide plate 3 can be smoothly installed at different angles, the second mounting hole 10 and the third mounting hole 12 in this embodiment are both in the form of waist-shaped holes, which can adaptively adjust the position of the connecting bolt 11 in the hole, and then rely on the nut to tighten and fix it to ensure the smooth installation of the guide plate 3.

[0038] Of course, in other embodiments, the deflector 3 can also be completed by an automatic angle adjustment mechanism, but this will inevitably increase the complexity of the vehicle bottom structure, which is contrary to the original intention of the present invention to reduce manufacturing, installation and maintenance costs. Therefore, the preferred implementation method still adopts the installation position adjustment solution.

[0039] It is understandable that when installing the deflector 3, the limitations of the relative positions between the actual installation stations are taken into consideration. Directly connecting the deflector 3 to the two T-slots 4 on the bottom of the vehicle may not meet the required angle requirements. Therefore, when setting the fixing seat 2 and the lifting bracket 1, the relative positions of the two are fully considered, and multiple bolt holes are reserved on the lifting bracket 1 and the fixing seat 2 to achieve the angle adjustment function.

[0040] In this embodiment, for a subway train 13, deflector assemblies are installed in the same manner at each car connection, ensuring that the deflectors 3 remain parallel. Deflectors 3 at the rear of each car are installed on the left side of the train 13's travel direction, with the upstream side of the deflector 3 closer to the train's centerline than the downstream side. Deflectors 3 at the front of each car are installed on the right side of the train 13's travel direction, with the upstream side of the deflector 3 further away from the train's centerline than the downstream side. Taking a six-car subway train 13 as an example, a total of ten sets of deflector assemblies are installed.

[0041] To effectively guide airflow, the outer edge of deflector 3 must extend to the limit of the vehicle's underbody, disrupting the boundary layer outside the vehicle's underbody. This allows high-speed, low-temperature airflow from the outside to be directed into the area surrounding linear motor 5 underneath the vehicle, disrupting the boundary layer underneath subway train 13 and altering the flow field beneath it. Taking into account the optimization effect of deflector 3 and the ability of airflow to flow smoothly beneath train 13, the angle between each deflector 3 and the direction of travel of train 13 can be set to any angle between 0 and 60 degrees.

[0042] It should be noted that, through further optimization, the length of the guide plate 3 of this device should be greater than 40 cm, and the bottom should be 3-10 cm away from the rail surface, so as to enhance the control effect of the flow field at the bottom of the subway train 13 without affecting the normal operation of the subway train 13.

[0043] It should be noted that, considering the overall lightweight requirement of the train 13, the fixing seat 2, the lifting bracket 1, etc. of this device are all made of aluminum alloy materials, which are light in weight while ensuring strength.

[0044] It can be understood that the guide plate 3 of the present device is made of rubber material, which ensures its structural rigidity. Even if it accidentally falls off the track, the wheels can break it without affecting the safe operation of the train.

[0045] In summary, this device optimizes heat dissipation for the linear motors 5 at the bottom of a subway train 13 at low manufacturing, installation, and maintenance costs. By rationally controlling the flow of air, it directs high-speed, low-temperature airflow into the undercarriage area, effectively reducing the overall temperature rise of each linear motor 5 on the train 13. Furthermore, its structure and installation method are simple and feasible, the raw materials for its components are readily available, and repair and maintenance costs are low, providing a promising solution for heat dissipation in unenclosed undercarriage equipment, including subway trains and conventional trains.

[0046] This scheme is further demonstrated to be feasible through numerical simulation. The simulation model is as follows: Figure 6 As shown, for the twelve linear motors 5 of the six-car formation, the angles between the guide plate 3 and the running direction of the train 13 are verified to be 30 degrees, 45 degrees and 60 degrees. The results are as follows Figure 7 shown.

[0047] It can be seen from the bar graph that the optimal angle of the guide plate 3 is not the same for the linear motors 5 in different car positions, and further debugging is needed to optimize the optimization effect of each linear motor 5. In addition, the device has a better cooling effect on the linear motors 5 in the front and rear end cars, but a poor cooling effect on the linear motor 5 in the middle position. Other auxiliary cooling methods can be considered.

[0048] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A heat dissipation optimization device for linear motors at the bottom of subway trains based on flow control, characterized in that: The device comprises a hanging bracket, a fixing seat, and a deflector. The hanging bracket is installed under the train floor. The hanging bracket installs the deflector through the fixing seat so that the deflector forms a preset angle with the train centerline. The deflector is used to destroy the boundary layer outside the train floor when the train is running, so that the airflow flows toward the area where the linear motor is located, thereby enhancing convective heat exchange. The top of the lifting bracket is detachably connected to the T-slot on the lower surface of the train floor, the bottom of the lifting bracket is detachably connected to the fixing seat, and the fixing seat is detachably connected to the top of the deflector; The hanging bracket includes a first mounting plate at the top, a second mounting plate at the bottom, and a column connecting the first mounting plate and the second mounting plate; A first mounting hole is provided on the first mounting plate, the first mounting hole corresponds to the T-slot and is detachably connected by a T-bolt and a nut. A second mounting hole is provided on the second mounting plate, and a third mounting hole and a fourth mounting hole are provided on the fixing seat. The third mounting hole corresponds to the second mounting hole and is detachably connected by a connecting bolt and a nut. The fourth mounting hole corresponds to the through hole reserved in the guide plate and is detachably connected by a connecting bolt and a nut.

2. The heat dissipation optimization device for linear motors at the bottom of subway trains based on flow control according to claim 1, characterized in that: The fixing seat includes two L-shaped profiles arranged opposite to each other, the vertical sides of the L-shaped profiles are respectively vertically attached to the two sides of the guide plate, and the fourth mounting hole is aligned with the through hole of the guide plate, the L-shaped profile is attached to the lower surface of the second mounting plate, and the third mounting hole is aligned with the second mounting hole.

3. The heat dissipation optimization device for linear motors at the bottom of subway trains based on flow control according to claim 1, characterized in that: At least two of the hanging brackets are arranged relatively parallel to each other, and a plurality of third mounting holes are provided on the fixing seat, which are respectively fixed at different positions of the second mounting holes of the hanging brackets, so that the guide plate forms different inclination angles.

4. The heat dissipation optimization device for linear motors at the bottom of subway trains based on flow control according to claim 3 is characterized in that: The included angle between each guide plate and the running direction of the train is 0-60°.

5. The heat dissipation optimization device for linear motors at the bottom of subway trains based on flow control according to claim 3 is characterized in that: The second mounting hole and the third mounting hole are both waist-shaped holes to adaptively adjust the position of the connecting bolt.

6. The heat dissipation optimization device for linear motors at the bottom of subway trains based on flow control according to claim 1, characterized in that: The guide plate is made of elastic material, which ensures structural rigidity. When it accidentally falls off the track, the wheels can directly crush it without affecting the safe operation of the train.

7. The heat dissipation optimization device for linear motors at the bottom of subway trains based on flow control according to claim 1, characterized in that: The guide plates are kept parallel to each other, and 1-2 groups of guide plates are arranged at diagonal positions at the connection between the carriages, and their angles are consistent with the direction of vehicle travel.

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