Double-channel shared fan heat dissipation structure

Abstract

The application discloses a heat dissipation structure of a double-channel shared fan, which comprises a cabinet body, airtight cabins, a fan cabin and other electric appliance cabins arranged in the cabinet body; the airtight cabins and the fan cabin are provided with a communicating main air duct, and a main air duct air inlet filter screen assembly is arranged on the main air duct; a heat exchange water tank assembly is arranged on a partition plate of the airtight cabin and the fan cabin, one side of the heat exchange water tank assembly is located in the airtight cabin, hot air in the airtight cabin is conducted to one side of the airtight cabin through convection and then is conducted to cooling liquid through heat conduction; the other side of the heat exchange water tank is provided with an air duct, the air duct is provided with an air inlet and an air outlet, an air inlet cover plate assembly for filtering air is arranged on the air inlet, the air outlet is communicated with the main air duct, and the air duct is used for conducting heat exchange of the heat exchange water tank assembly through convection to reduce the temperature of the heat exchange water tank assembly; hot air formed at fin positions of power devices in the main air duct and hot air after heat exchange of the heat exchange water tank assembly are sucked into a centrifugal fan, and then are discharged from air outlets of other electric appliance cabins, so that the heat dissipation of the power devices is realized through the double channels.

Description

Technical Field

[0001] This invention belongs to the field of rail transit, specifically a heat dissipation structure for a dual-channel shared fan. Background Technology

[0002] Currently in the rail transit field, the structural dimensions of electrical equipment are becoming increasingly compact, and the internal power devices are being arranged more densely. This leads to a more concentrated heat generation from the power devices. The high temperature inside the sealed compartment can affect the reliability and safety of the electrical equipment. In an environment where the power devices are installed at IP55, the fins of the heat sink are generally located in the air duct (the air duct has an IP21 protection rating, while the electrical components are installed in a sealed IP55 environment) and heat exchange is achieved using forced air cooling or directional airflow. The temperature of the heat sink fins comes from the heat conduction from the power devices (such as IGBTs) inside the sealed compartment to the heat sink fins. A portion of the heat inside the sealed compartment still accumulates inside the compartment.

[0003] A key consideration is to rapidly dissipate the high temperature within the sealed compartment, especially since electrical equipment mounted on the roof is more susceptible to the high temperatures from external solar radiation, causing the temperature inside the sealed compartment to gradually increase. Conventional heat exchange methods mostly rely on convection between the compartment's own materials and the outside air to dissipate heat naturally, but this is relatively ineffective, especially in hot weather (summer). Therefore, a highly protective and efficient heat exchange structure is needed to reduce the temperature inside the sealed compartment. By incorporating structures on the side walls of the sealed compartment that can assist in heat dissipation, the internal temperature can be reduced more effectively.

[0004] In conventional designs, IP55 sealed chambers cannot exchange heat. Most products typically have only one main air duct, using fans or ventilators for heat dissipation. However, sealed chambers can only adapt to ambient temperatures and the temperatures generated by internal components. Under high temperatures, the heat in the chamber cannot be completely carried away by the heat sink fins within the air duct, which will eventually cause some power devices to activate their protection mechanisms, thus stopping or reducing their power output.

[0005] Conventional aluminum radiators for auxiliary heat dissipation in enclosed chambers either add a small fan to their fins for additional heat dissipation, or allow the radiator to dissipate heat naturally in contact with the air (this function cannot be achieved in some installation environments). The lack of independent air ducts for forced heat dissipation results in poor heat exchange efficiency, because the difference between natural heat dissipation and non-liquid cooling and forced air cooling combined with liquid cooling conduction heat dissipation is significant. Summary of the Invention

[0006] The purpose of this invention is to provide a heat dissipation structure with a dual-channel shared fan, which achieves heat dissipation of power devices through dual channels and removes heat through the same fan.

[0007] The technical solution to achieve the purpose of this invention is as follows:

[0008] A heat dissipation structure for a dual-channel shared fan includes a cabinet and multiple compartments disposed within the cabinet; characterized in that the compartments include:

[0009] Enclosed compartments for installing power devices, fan compartments for installing centrifugal fans and other electrical compartments;

[0010] The sealed compartment and the fan compartment are connected by a main air duct, and the main air duct is equipped with a main air duct inlet filter assembly.

[0011] A heat exchange tank assembly is provided on the partition between the sealed compartment and the fan compartment. One side of the heat exchange tank assembly is located inside the sealed compartment. Hot air inside the sealed compartment is conducted to one side of the sealed compartment through convection and then transferred to the coolant through heat conduction. The other side of the heat exchange tank is provided with an air duct, which has an air inlet and an air outlet. The air inlet is provided with an air inlet cover assembly for filtering air, and the air outlet is connected to the main air duct. This air duct is used for convection to cool and exchange heat for the heat exchange tank assembly.

[0012] The main air duct is used to introduce air and carry away the heat emitted by the power devices;

[0013] The centrifugal fan draws in the hot air from the main air duct that has passed through the power devices and the hot air that has been exchanged with the heat exchange tank assembly, and discharges it from the air outlet through other electrical compartments.

[0014] The significant advantages of this invention compared to existing technologies are:

[0015] By adding an extra cooling water tank assembly within a confined space, the efficiency of high-temperature heat exchange in the sealed compartment is improved. The cooling water tank assembly features independent air intake channels (dual channels) that share a centrifugal fan to draw in air from outside the electrical equipment. After filtration, the air enters its respective duct, providing forced air cooling to areas requiring heat dissipation, and then exhausting the hot air through a shared channel. Compared to conventional aluminum finned radiators, this design offers higher heat exchange efficiency, more effectively and quickly removing heat from the sealed compartment. Structural features include: high protection level, high heat exchange capacity, boltless quick-release filter plate, and compact structure. In small-space installation environments, in addition to the main air duct for heat dissipation, this structure provides an additional auxiliary cooling mode, thereby improving the overall heat dissipation capacity of the compartment. Attached Figure Description

[0016] Figure 1 This is a three-dimensional view of the overall cabinet.

[0017] Figure 2 This is a schematic diagram of the airflow direction in the main air duct inside the cabinet.

[0018] Figure 3 Diagram showing the installation location of the hot water tank assembly for the sealed compartment.

[0019] Figure 4 This is a schematic diagram of the airflow direction within the hot water exchange tank assembly inside the cabinet.

[0020] Figure 5 Diagram showing the installation location of the hot water tank assembly on the side of the wind turbine nacelle.

[0021] Figure 6 This is a schematic diagram of the bottom structure of the air duct (with the bottom cover removed).

[0022] Figure 7 for Figure 6 Structural diagram of the main air duct water tank inlet at point D in the cabinet.

[0023] Figure 8 For replacing hot water tank components 3D Figure 1 .

[0024] Figure 9 For replacing hot water tank components in three dimensions Figure 2 .

[0025] Figure 10 This is an internal view of the hot water tank assembly (top cover hidden).

[0026] Figure 11 This is the main view of the hot water tank replacement assembly.

[0027] Figure 12 Left view of the hot water tank replacement assembly.

[0028] Figure 13 A bottom view of the hot water tank replacement assembly.

[0029] Figure 14 This is a cross-sectional view of the hot water tank replacement assembly (AA).

[0030] Figure 15 This is a cross-sectional view of the hot water tank replacement assembly BB.

[0031] Figure 16 This is a CC cross-sectional view of the hot water tank replacement assembly.

[0032] Figure 17 This is a diagram of the external structure of the air inlet cover assembly.

[0033] Figure 18 This is a diagram of the internal structure of the air inlet cover assembly.

[0034] Figure 19 This is a 3D view of the air inlet cover assembly.

[0035] Figure 20 for Figure 19 Enlarged view of point C in the middle.

[0036] Figure 21 This is a schematic diagram showing the installation or removal status of the filter screen assembly in the air inlet cover assembly.

[0037] Figure 22 This is a schematic diagram of the closed state of the filter plate assembly in the air inlet cover assembly.

[0038] Figure 23 This is a structural diagram of a rotating bearing.

[0039] Figure 24 This is a 3D view of the rotating bearing.

[0040] Figure 25 Left view of the rotating caliper.

[0041] Figure 26 This is a structural diagram of the filter plate assembly.

[0042] Figure 27 Left view of the filter plate assembly.

[0043] Figure 28 This is a rear view of the filter plate assembly.

[0044] Figure 29 This is a 3D view of the filter plate assembly.

[0045] Figure 30 This is a 3D view of the toggle switch. Detailed Implementation

[0046] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0047] Combination Figures 1-30 This invention discloses a dual-channel shared fan heat dissipation structure, which is installed inside the cabinet of electrical equipment. The cabinet is installed on the ground on the top of a train, that is, in areas such as the cover plate, directly receiving solar radiation. The entire air duct draws in air from one side of the cabinet (with a filter device) and exits from the other side. The air first blows over the power devices inside the cabinet (the power devices are finned heat sinks, with fins 100 located in the main air duct). The air is then drawn up by the suction of the centrifugal fan 4, and then blown by the centrifugal fan 4 over the transformer and inductor, and finally discharged from the other end of the cabinet. Meanwhile, the corrugated panel 3-5 on one side of the hot water tank assembly 3 draws in air through the external cover plate, blows over its surface, and is then drawn into the main air duct of the cabinet, where it is drawn in by the centrifugal fan and the hot air is thrown out. (See overall, airflow direction, schematic diagram and enlarged view B).

[0048] The entire cabinet is divided into multiple compartments, including a sealed compartment 11 for installing heating devices and power modules, a fan compartment 12 for installing centrifugal fans 4, and other electrical compartments 13 for installing transformers, inductors, etc. The hot water tank assembly 3 is located on a partition between the sealed compartment 11 and the fan compartment 12. The sealed compartment 11 and the fan compartment 12 are connected by a main air duct 14 at their bottoms. The sealed compartment 11 is equipped with a main air duct inlet filter assembly 5. Air is filtered by the main air duct inlet filter assembly 5 and enters the main air duct 14 at the bottom of the sealed compartment 11 and the fan compartment 12. It is then sucked up by the suction of the centrifugal fans 4 and blown into the electrical compartment 13 by the centrifugal fans 4.

[0049] The hot water exchange tank assembly 3 includes a shell, a water tank connected to the shell, an airflow distribution plate 3-4 inside the shell, an air valve cover 3-1 on the top, an air inlet 3-3 on the side, and an air outlet 3-7 at the bottom, with a rubber strip 3-8 fitted around the air outlet 3-7. Corrugated panels 3-5 are located on both sides of the water tank; one corrugated panel 3-5 is located inside the sealed compartment 11, and the other corrugated panel 3-5 is located inside the shell, forming an air duct with the shell and directly facing the airflow distribution plate 3-4. An air inlet cover assembly 2 is located on the side cover of the fan compartment 12; the air guide tube 2-2 of the air inlet cover assembly 2 is connected to the air inlet 3-3 of the hot water exchange tank assembly 3; the air outlet 3-7 is connected to the air duct of the cabinet. The airflow distribution plate 3-4 is provided with air guide holes 3-40. From the upper air inlet 3-3 along the airflow direction to the downward air outlet 3-7, the number of air guide holes 3-40 gradually increases, so that the airflow blown vertically to the wave panel 3-5 through the airflow distribution plate 3-4 is evenly distributed.

[0050] The structure of the hot water tank assembly 3 is mainly made of aluminum plates and welded together. Two parallel corrugated panels 3-5 are arranged on it. The shape of the corrugated panels 3-5 increases the heat absorption area. Meanwhile, the water tank assembly 3 is filled with a coolant consisting of 40% ethylene glycol and 60% deionized water, filling three-quarters of its volume. This coolant is introduced through the top valve cover 3-1 (with an venting device to release water tank pressure). The water level is observed via the liquid level indicator 3-2 on the side of the tank, and should not exceed the maximum mark. One side of the corrugated panel 3-5 is located within the sealed compartment 1 of the power device. Inside the sealed chamber 11, the high-temperature gas is conducted to the aluminum plate surface of the corrugated panel 3-5 through thermal convection. The heat is then conducted to the coolant through the aluminum plate. The coolant, through convection, also transfers heat to the other side of the corrugated panel 3-5 in the air duct. Similarly, the heat is conducted to the outside through the aluminum plate, and then cooled and exchanged by the strong convection of the outside air, ultimately reducing the temperature inside the sealed chamber 11. Since the air outlet 3-7 of the hot water tank assembly 3 is connected to the main air duct 14 of the cabinet, the hot airflow inside the shell is also drawn in by the centrifugal fan and thrown out. The hot water tank assembly 3 should be installed as close to the upper side or top as possible, and should not be placed at the bottom.

[0051] The air inlet cover assembly 2 includes an air inlet cover 2-1, an air guide tube 2-2, an upper shaft seat 2-4, a rotating retaining shaft 2-5, a toggle piece 2-6, a filter screen sealing strip 2-7, and a filter screen assembly 2-8. The air inlet cover 2-1 is fixed to the fan compartment. An air inlet hole 2-1-1 is provided on the outer side of the air inlet cover 2-1. The air guide tube 2-2 is welded to the reverse side of the air inlet cover 2-1. The air guide tube 2-2 is made of aluminum plate and has an air inlet groove 2-2-3 and a through hole 2-2-1 inside. The end of the air guide tube 2-2 has a through hole 2-2-1, and a foam strip 2-2-2 is provided on the through hole 2-2-1. The upper side of the air inlet hole 2-1-1... An upper shaft seat 2-4 is fixed; a rotating retaining shaft 2-5 passes through the upper shaft seat 2-4 and can rotate relative to it; the rotating retaining shaft 2-5 is made of stainless steel round steel, with two M4 through threaded holes 2-5-1 in the middle; both ends have rotating notches 2-5-2 (the opening transitions to the shaft center, forming a large opening that gradually narrows, facilitating the sliding entry and exit of the retaining shaft); a toggle notch 2-5-3 is located at the position of the threaded hole 2-5-1 for mounting the toggle piece 2-6; the toggle piece 2-6 is placed in the toggle notch 2-5-3 and then mounted on the threaded hole 2-5-1 with screws. Two lower shaft seats 2-3 are fixed below the air inlet 2-1-1; a filter plate sealing strip 2-7 is provided around the air inlet 2-1-1, which is a purchased single-sided adhesive sealing strip, typically with a compression of 1-1.5mm and an original thickness of 3mm. The filter plate assembly 2-8 includes a grid plate 2-8-1 and a pressure plate 2-8-2. A 30-mesh stainless steel wire mesh 2-8-3 is provided between the grid plate 2-8-1 and the pressure plate 2-8-2. Two pads 2-8-4 are fixed to the upper and lower ends of the grid plate 2-8-1, respectively. Each of the two upper pads 2-8-4 is equipped with a retaining shaft 2-8-6 for engaging with the rotating notch 2-5-2 during installation. Each of the two lower pads 2-8-4 is equipped with a rotating shaft 2-8-5 for inserting into the lower shaft seat 2-3 during installation. The actuating piece 2-6 serves as an actuating element during installation, an axial movement limiter for the rotating retaining shaft 2-5, and a gravity adjustment element, ensuring that the rotating notch 2-5-2 always faces inward toward the air inlet cover 2-1 under normal conditions. The inwardly tapering structure of the rotating notch 2-5-2 limits the axial displacement of the retaining shaft 2-8-6.

[0052] When installing the filter plate assembly 2-8, move the actuating blade 2-6 upwards so that the rotating notch 2-5-2 faces outwards (away from the air inlet cover 2-1), insert the rotating shaft 2-8-5 into the lower shaft seat 2-3, and engage the retaining shaft 2-8-6 into the rotating notch 2-5-2. Move the actuating blade 2-6 downwards so that the rotating notch 2-5-2 faces inwards (towards the air inlet cover 2-1). To remove the filter plate assembly, similarly move the actuating blade 2-6 upwards so that the rotating notch 2-5-2 faces outwards. The structural features of the air inlet cover assembly 2, which adopts a quick installation and removal method, greatly improves the cleaning effect of the filter plate assembly 2-8. It is simple, reliable, and easy to operate. Its feature is that, combined with the installation of the toggle piece 2-6, the weight of the component itself allows the rotating shaft 2-5 to hang down naturally. The irregular rotating notch 2-5-2 remains fitted on the shaft 2-8-6 of the filter plate assembly 2-8. Even during vehicle operation, the swaying amplitude cannot cause the filter plate assembly 2-8 to fall off from the irregular rotating notch 2-5-2.

[0053] The operation process is explained as follows:

[0054] First, the hot water tank assembly 3 is inserted from the fan compartment 12 into the sealed compartment 11 of the power device. The hot water tank sealing strip 3-6 is then attached to the partition of the sealed compartment 11 and secured with bolts. At the same time, the water tank vent strip 3-8 around the bottom of the hot water tank assembly 3 is compressed and sealed to the water tank opening 14-1 on the main air duct 14 of the cabinet, thereby sealing and isolating the hot water tank 3 from the sealed compartment 11 while connecting it to the main air duct 14 of the cabinet.

[0055] Next, the air inlet cover 2-1 and the air guide duct 2-2 are welded and sealed. Then, a foam strip 2-2-2 is installed around the outside of the through hole 2-2-1 of the air guide duct 2-2. Next, a filter screen sealing strip 2-7 is pasted on the front of the air inlet hole 2-1-1 of the air inlet cover 2-1. On the back of the air inlet cover 2-1, two lower shaft seats 2-3 and one upper shaft seat 2-4 are fastened with six M3*10 screws. Next, pass the rotating shaft 2-5 through the upper shaft seat 2-4, roughly centering it. Then, use an M4*10 bolt to screw the actuating piece 2-6 into the M4 through threaded hole 2-5-1 using an M4 screw. At this point, the two actuating pieces 2-6 on the left and right restrict the displacement of the rotating shaft 2-5 (a 0.5mm gap is reserved between each actuating piece 2-6 and the upper shaft seat 2-4). The welded filter plate assembly 2-8 is inserted from the right side into the lower shaft seat 2-3 via the large and small diameter rotating shafts 2-8-5. Then, the filter plate assembly 2-8 is flipped upwards, and the irregular rotating notch 2-5-2 of the rotating shaft 2-5 is turned outwards, that is, facing the shaft 2-8-6 of the filter plate assembly 2-8. The shaft 2-8-6 is then inserted into the rotating notch 2-5-2. Then, the filter plate assembly 2-8 is flipped downwards by the actuating piece 2-6. This completes the installation of the filter plate assembly 2-8. The disassembly process is the reverse operation. (During this process, the pressure plate 2-8-2 of the filter plate assembly 2-8 is pressed, squeezing the filter plate sealing strip 2-7 and compressing it by 1mm, thereby sealing its perimeter. External air can only pass through the grille 2-8-1, the 30-mesh stainless steel wire mesh 2-8-3, the pressure plate 2-8-2, and enter the through hole 2-2-1 and the air inlet slot 2-2-3 in sequence.)

[0056] Finally, the entire air inlet cover assembly 2 is installed on the cabinet with bolts. At this time, the foam strip 2-2-2 at the air guide tube 2-2 is fitted around the air inlet 3-3 of the hot water tank 3, thus forming a sealed channel.

[0057] When the centrifugal fan 4 starts working (the centrifugal fan 4 has its intake on the duct surface and its outlet inside the fan compartment), filtered air is drawn in from the external air intake filter assembly 5 of the main air duct 14. The air then passes through the heat dissipation fins 100 of the power devices and is drawn into the fan compartment from the main air duct 14 by the centrifugal fan 4, where it is then ejected by the centrifugal fan 4. Simultaneously, the airflow generated at this time also includes some air entering the internal air duct of the hot water exchanger assembly 3 through the filter plate assembly 2-8 of the air inlet cover assembly 2. Similarly, external air passes through the air inlet slot 2- of the air guide duct 2-2. 2-3, then through the through hole 2-2-1 and the water tank inlet 3-3 of the hot water tank assembly 3, inside through the air distribution plate 3-4 (the air distribution plate adopts a progressive increase in the air outlet area so that the airflow blowing vertically toward the wave panel 3-5 is evenly distributed), vertically downward through the surface of the wave panel 3-5 in the air duct, and then through the air outlet 3-7 and the water tank inlet 14-1 of the main air duct of the cabinet, into the main air duct 14 of the cabinet; the two channels are heat dissipated at the same time, and finally through the centrifugal fan 4, blown toward the transformer, inductor and other magnetic heating devices, and discharged from the air outlet;

[0058] Clean the inlet filter assembly according to its usage and contamination status to ensure adequate ventilation and equipment heat dissipation. This structure features high protection and quick filter replacement, achieving high internal protection (IP55) and rapid heat exchange. During long-term maintenance, open cover assembly 2 and replenish coolant by observing the water level indicator. By adding a water tank to the conventional closed-loop cooling structure (which only has finned forced air cooling and no independent heat dissipation in the closed compartment), the water tank conducts heat through an independent air duct, achieving forced air cooling. This rapid and efficient heat exchange effectively reduces the temperature inside the closed compartment during high-temperature seasons, thereby ensuring a reliable working environment for electrical equipment.

Claims

1. A double-channel shared fan heat dissipation structure, comprising a cabinet body, a plurality of compartments arranged in the cabinet body; characterized in that, The cabin comprises: Airtight cabin for installing power devices, fan cabin for installing centrifugal fan and other electrical appliance cabin; The airtight cabin and fan cabin are provided with a communicating main air duct, and a main air duct air inlet filter screen assembly is arranged on the main air duct; A heat exchange water tank assembly is arranged on the partition plate of the airtight cabin and fan cabin, one side of the heat exchange water tank assembly is located in the airtight cabin, hot air in the airtight cabin is conducted to the one side of the airtight cabin through convection, and is then conducted to the cooling liquid through heat conduction; the other side of the heat exchange water tank assembly is provided with an air duct, the air duct is provided with an air inlet and an air outlet, an air inlet cover plate assembly for filtering air is arranged on the air inlet, and the air outlet is communicated with the main air duct, the air duct is used for convection and heat exchange of the heat exchange water tank assembly. The main air duct is used for introducing air to take away the heat generated by the power devices; The centrifugal fan sucks in the hot air in the main air duct and the hot air after heat exchange of the heat exchange water tank assembly, and discharges the hot air from the air outlet of the other electrical appliance cabin; The heat exchange water tank assembly comprises a shell and a water tank connected with the shell; Cooling liquid is filled in the water tank, and the two side surfaces are wave panels, one of the wave panels is located in the airtight cabin, and the other wave panel is located in the shell and forms an air duct with the shell; the high-temperature gas in the airtight cabin is conducted to the wave panel on one side through heat convection, and then is conducted to the cooling liquid through heat conduction, the cooling liquid transmits the heat to the wave panel on the other side in the air duct through convection, and then conducts the heat of the internal cooling liquid to the outside through heat conduction, and cools and exchanges heat with the external air through convection, and the hot air in the air duct is sucked into the centrifugal fan.

2. The heat dissipation structure of claim 1, wherein, An air flow distribution plate is arranged in the air duct, and is used for uniformly distributing the air flow entering from the air inlet to the wave panel on the side of the air duct.

3. The heat sink structure of claim 2, wherein, A plurality of air guide holes are arranged on the air flow distribution plate, and the number of the air guide holes gradually increases from the air inlet at the upper portion to the air outlet downward along the air flow direction.

4. The heat sink structure of claim 2, wherein, A liquid level display instrument is arranged on the side surface of the water tank.

5. The heat sink structure of claim 1, wherein, The air inlet cover plate assembly comprises an air inlet cover plate, an air guide cylinder, an upper shaft seat, a rotating clamping shaft, a pushing piece, and a filter screen plate assembly; The air inlet cover plate is fixed with the fan cabin, and the air inlet hole of the air inlet cover plate is connected with the air inlet of the heat exchange water tank assembly through the air guide cylinder; the upper shaft seat is fixed on the outer side of the air inlet cover plate at the upper end, and two lower shaft seats are fixed at the lower end; The rotating clamping shaft is rotatably connected with the upper shaft seat, and rotating notches are arranged at the two ends of the rotating clamping shaft; Two pushing pieces are connected with the rotating clamping shaft, and the pushing pieces are located at the two ends of the upper shaft seat and are used for limiting the axial displacement of the rotating clamping shaft, and simultaneously serve as gravity adjusting members to make the rotating notches inward in normal state; Two rotating clamping shafts are arranged at the lower end of the filter screen plate assembly and are used for rotatably connecting with the lower shaft seats; two clamping shafts are arranged at the upper end of the filter screen plate assembly and are used for clamping into the rotating notches, and the rotating notches can limit the axial movement of the clamping shafts.

6. The heat sink structure of claim 5, wherein, The installation method of the air inlet cover plate assembly is as follows: fixing and sealing the air inlet cover plate and the air duct; setting a foaming rubber strip outside the air duct; front pasting a filter screen plate sealing rubber strip at the air inlet hole of the air inlet cover plate; fixing the lower shaft seat and the upper shaft seat with the air inlet cover plate; then passing the rotating shaft through the upper shaft seat, fixing the toggle piece on the rotating shaft, laterally inserting the rotating shaft of the filter screen plate assembly into the lower shaft seat, and then turning up the filter screen plate assembly, with the rotating gap of the rotating shaft outward, and the rotating shaft clamped into the rotating gap, and then turning down the toggle piece, to complete the installation of the filter screen plate assembly.

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