Air door actuator of rail transit fresh air system

Abstract

The present application relates to rail transit fresh air system technical field, especially a kind of air door actuator of rail transit fresh air system, it includes installation bottom plate, air door plate, support frame, lifting assembly and drive assembly, drive assembly is installed on support frame, drive assembly includes shaft, rotor core, magnetic steel and stator, shaft is hollow variable-diameter shaft, it includes large diameter section and small diameter section, rotor core is installed in the upper portion of large diameter section, and the bottom surface of large diameter section is uniformly provided with a circle of cylindrical hole, magnetic steel and stator are sequentially arranged outside rotor core, brake is installed in the upper portion of small diameter section;Lifting assembly has ball screw and screw nut, screw nut is installed on ball screw and fixed on the bottom surface of large diameter section, the upper portion of ball screw is inserted into the hollow portion of shaft, the lower end of ball screw is connected with guide plate, and guide plate is fixed to the top middle of air door plate.The structure is more compact, the design is more reasonable, meet the requirement of rail transit light weight, and can guarantee waterproof, dustproof requirement.

Description

Technical Field

[0001] This invention relates to the field of fresh air systems for rail transit, and in particular to a damper actuator for a fresh air system for rail transit. Background Technology

[0002] As the train enters the tunnel, the compressibility of air and the restriction of lateral and upward airflow by the train and tunnel walls cause the air in front of the train to be compressed and move forward with the train. This results in a sudden increase in air pressure in front of the train, generating a compression wave. The remaining air, displaced by the train, flows behind the train through an annular space. As the train continues into the tunnel, the length of the annular space gradually increases, causing the air pressure in front of the train to continue to rise, meaning the intensity of the compression wave continues to increase, until the entire train has entered the tunnel. This pressure wave propagates forward at the speed of sound. The air velocity in front of the pressure wave is zero, while the air behind the pressure wave moves forward with the train at a certain speed. After reaching the exit, part of the pressure wave is reflected back as an expansion wave, while the other part exits the tunnel as a micro-pressure wave.

[0003] When the pressure difference between the inside and outside of the car exceeds a certain value, the train pressure protection system is activated. The pressure control device installed in the train's electrical cabinet controls all intermediate relays to operate, which in turn controls the pressure wave protection valves installed at the fresh air inlet and exhaust outlet of each car to operate, closing the fresh air inlet and exhaust outlet to block the pressure wave from outside the car from entering the car. At this time, the air conditioning system operates in full return air mode.

[0004] Most existing pressure wave protection devices / pressure wave dampers use cylinders to drive the damper plate to open and close (e.g., patents with announcement numbers CN217804719U, CN213862229U, and CN217683499U). The cylinder output motion is not smooth, and the transmission accuracy is not high. There is a delay in the opening and closing of the damper plate, and it is not convenient to accurately control the opening degree of the damper plate.

[0005] Another type uses a motor and transmission components to drive the damper plate to open and close. For example, patent CN216951906U uses a motor to drive a cam to rotate, which in turn drives an adjusting arm to move, thus opening and closing the damper plate. However, the cam and adjusting arm structure is not very stable under high air pressure. Another example is patent CN210554822U, which uses a motor to drive a meshing bevel gear, which in turn drives a rotating rod to rotate, thus opening and closing the damper plate (connected to a slider, moving along a guide rail). This allows for more precise control of the damper plate opening, but the meshing bevel gear increases the installation space of the entire pressure wave valve, making later maintenance more difficult. Regarding this patent, a previous application proposed a pressure wave protection device for air conditioning in rail transit vehicles. This device uses a motor to drive a drive shaft, which in turn rotates a connecting block, causing a drive rod to rotate. This, in turn, moves a linear guide bearing with the damper plate, simplifying the number of parts, solving some noise problems, and further compacting the structure. However, the air outside the carriage contains dust and has a certain level of humidity, which can affect the transmission efficiency of the transmission components. Since the motor is mounted on the side, it is necessary to ensure the convenience of side-mounted motor installation, the precision of transmission component installation, and the ease of installation of the power supply box and control box. With the increasing demand for lightweight trains, it is necessary to further ensure a compact structure and ease of maintenance. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a damper actuator for a fresh air system in rail transit.

[0007] The technical solution adopted by this invention to solve its technical problem is: a damper actuator for a rail transit fresh air system, comprising a mounting base plate, a damper plate, a support frame, a lifting assembly, and a drive assembly for driving the lifting assembly. The drive assembly is mounted on the support frame and includes a rotating shaft, a rotor core, magnets, and a stator. The rotating shaft is a hollow variable-diameter shaft, comprising a large-diameter section and a small-diameter section. The rotor core is mounted on the upper part of the large-diameter section. A ring of cylindrical holes is evenly opened on the bottom surface of the large-diameter section. Magnets and a stator are sequentially arranged outside the rotor core. A brake is installed on the upper part of the small-diameter section. The lifting assembly has a ball screw and a screw nut. The screw nut is mounted on the ball screw and fixed on the bottom surface of the large-diameter section. The upper part of the ball screw extends into the hollow part of the rotating shaft, and the lower end of the ball screw is connected to a guide plate. The guide plate is fixed to the top center of the damper plate.

[0008] Furthermore, the drive assembly has a cover, which includes a housing, an upper cover, and a lower cover. The upper part of the housing has a partition, and the partition has a first through hole in the middle for a small diameter section of the rotating shaft to pass through. The inner wall of the first through hole is provided with an upper bearing that is interference-fitted with the rotating shaft. The brake is disposed between the upper cover and the partition.

[0009] Furthermore, the lower cover has a second through hole in the middle for the large diameter section of the rotating shaft to pass through. The second through hole is a variable diameter hole, which includes a large diameter part and a small diameter part. The inner wall of the large diameter part is provided with a lower bearing that is interference-fitted with the rotating shaft, and the edge of the small diameter part extends downward to form a ring edge that is clearance-fitted with the lead screw nut.

[0010] Furthermore, a flexible waterproof sleeve is provided between the lower cover and the guide plate. The waterproof sleeve has a tower-shaped structure, with an upper connecting edge and a lower connecting edge on its upper and lower edges, respectively.

[0011] Furthermore, an annular groove is provided on the outer side of the bottom edge of the lower cover, and a waterproof upper pressure plate connected to the upper connecting edge is provided in the annular groove. A waterproof lower pressure plate connected to the lower connecting edge is provided on the upper surface of the guide plate.

[0012] Furthermore, the lead screw nut is a hollow variable diameter component, which includes a large diameter section and a small diameter section. The small diameter section extends into the large diameter section, and the large diameter section is located at the bottom of the large diameter section and has a connecting hole.

[0013] Furthermore, the upper end of the ball screw is connected to a first elastic limiting member, the upper end of the small diameter section is glued with a second elastic limiting member, the second elastic limiting member is provided with a supporting step to support the first elastic limiting member, and a notch is symmetrically opened on the lower outer wall of the ball screw.

[0014] Furthermore, four guide rods are installed between the guide plate and the lower cover. The upper end of each guide rod is fixedly connected to the lower cover, and the lower end of each guide rod is mounted on the guide plate through a linear bearing. An installation groove is provided in the middle of the guide plate, and a pair of screw fixing blocks are provided in the installation groove. The screw fixing blocks are inserted into the notch and fixedly connected to the guide plate.

[0015] Furthermore, the support frame includes a support plate and support rods fixedly installed at the four corners of the support plate. The two sides of the support plate are folded upward to form retaining edges, and a number of weight-reducing holes are provided on the support plate.

[0016] Furthermore, on both sides of the drive assembly on the support plate, there are control boxes and power supply boxes that are electrically connected to the drive assembly. An elliptical air vent is provided on the mounting base plate, and a sealing ring is provided around the edge of the air vent. The damper plate is also elliptical, and its bottom area is larger than the area of ​​the air vent.

[0017] The beneficial effects of this invention are:

[0018] (1) The drive assembly and lifting assembly of the present invention are longitudinally distributed, and the lifting assembly part is lifted and lowered within the drive assembly, which greatly reduces the installation height of the entire damper actuator;

[0019] (2) The drive assembly of the present invention adopts the structure of an electric motor, and the rotating shaft is changed to a hollow variable diameter shaft. On the one hand, it allows the ball screw to extend in, and part of the stroke of the ball screw is completed in the rotating shaft. On the other hand, it facilitates the installation of the rotor core, magnet and stator.

[0020] (3) A ring of cylindrical holes is opened on the bottom surface of the large diameter section of the hollow variable diameter shaft, which not only facilitates the connection of the screw nut, but also reduces weight and helps dissipate heat.

[0021] (4) A brake is installed on the small diameter section of the hollow variable diameter shaft. The brake performs braking after the shaft stops rotating. At this time, the brake is not powered, so there is no energy consumption while maintaining thrust, thus achieving precise control.

[0022] (5) The shaft can be controlled to rotate via the controller, and can be stopped and started at will within the entire stroke of the damper actuator;

[0023] (6) The drive assembly is equipped with a cover, and the brake and motor structures are placed in layers, which is easy to implement and maintain; the lower cover of the cover is equipped with a second through hole of the variable diameter structure, which facilitates the installation of the lower bearing, and the ring edge protects the lead screw nut.

[0024] (7) The waterproof sleeve can prevent moisture and dust from outside the carriage from entering the drive components and ensure the performance of the drive components; the waterproof upper pressure plate and the waterproof lower pressure plate are embedded in the installation, which saves space and ensures the firmness of the waterproof sleeve connection; and the waterproof sleeve also has the function of reducing noise.

[0025] (8) The screw nut is also a variable diameter component to ensure the stability of its installation, thereby ensuring the smoothness of the ball screw movement;

[0026] (9) The stroke of the ball screw is the maximum stroke of the entire damper actuator. Its upper end is connected to the first elastic limiter of the maximum stroke limit. The second elastic limiter on the screw nut plays a buffering role against the first elastic limiter.

[0027] (10) A guide rod is set between the guide plate and the support frame. The stroke of the guide rod is the minimum stroke of the entire damper actuator. The guide rod also further ensures the stability of the damper plate's up and down movement and prevents the damper plate from rotating. A notch is set at the bottom of the ball screw and a pair of screw fixing blocks are set in the mounting groove of the guide plate to facilitate connection with the ball screw. The connection is reliable and easy to disassemble and assemble.

[0028] (11) Upward-turning guards are provided on both sides of the support frame to facilitate the installation of the support frame and to protect the drive components, etc., to ensure the stability of the entire damper actuator;

[0029] (12) The control box and power supply box are respectively set on both sides of the drive assembly to achieve unified installation, save time and ensure installation efficiency;

[0030] (13) The present invention has a more compact structure and a more reasonable design, which meets the requirements of lightweight rail transit, and can ensure waterproof requirements, reduce maintenance frequency, and extend service life. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 This is a schematic diagram of the structure of the present invention.

[0033] Figure 2 This is a schematic diagram of the support frame in this invention.

[0034] Figure 3 This is a schematic diagram of the drive assembly with the cover removed in this invention.

[0035] Figure 4 This is a schematic diagram of the installation of the lifting component in this invention.

[0036] Figure 5 This is a schematic diagram of the installation of the lead screw nut and the lead screw in this invention.

[0037] Figure 6 This is a schematic diagram of the installation of the ball screw and guide plate in this invention.

[0038] Figure 7 This is a schematic diagram of the structure of the cover in this invention.

[0039] Figure 8 yes Figure 7 A schematic diagram of the structure of the lower cover.

[0040] Figure 9 This is a schematic diagram of the installation of the waterproof sleeve in this invention.

[0041] In the diagram: 1. Mounting base plate, 1-1. Air outlet, 2. Air damper plate, 3. Support frame, 31. Support plate, 311. Edge retainer, 312. Weight reduction hole, 32. Support rod, 4. Lifting assembly, 41. Ball screw, 411. Notch, 42. Screw nut, 421. Large diameter section, 4211. Connecting hole, 422. Small diameter section, 5. Drive assembly, 50. Cover, 501. Housing, 5011. Partition plate, 50111. First through hole, 502. Top cover, 503. Bottom cover, 5031. Second through hole, 50311. Large diameter section, 50312. Small diameter section, 5032. Ring edge, 5 033. Annular groove, 51. Rotating shaft, 511. Large diameter section, 5111. Cylindrical hole, 512. Small diameter section, 52. Rotor core, 53. Magnet, 54. Stator, 55. Brake, 56. Upper bearing, 57. Lower bearing, 6. Control box, 7. Power supply box, 8. Sealing ring, 9. Guide plate, 91. Mounting groove, 10. Waterproof sleeve, 101. Upper connecting edge, 102. Lower connecting edge, 11. Waterproof upper pressure plate, 12. Waterproof lower pressure plate, 13. First elastic limiting element, 14. Second elastic limiting element, 141. Support step, 15. Guide rod, 16. Linear bearing, 17. Screw fixing block. Detailed Implementation

[0042] The present invention will now be further described in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner, and therefore only show the components relevant to the invention.

[0043] like Figures 1-3 As shown, a damper actuator for a rail transit fresh air system includes a mounting base plate 1, a damper plate 2, a support frame 3, a lifting assembly 4, and a drive assembly 5 for driving the lifting assembly 4. The drive assembly 5 has a cover 50. Figure 2 As shown, the support frame 3 includes a support plate 31 and support rods 32 fixedly mounted on the four corners of the support plate 31. The two sides of the support plate 31 are folded upwards to form flanges 311, and the support plate 31 has several weight-reducing holes 312. Figure 1 and Figure 3 As shown, on both sides of the drive assembly 5 on the support plate 31, there are control boxes 6 and power supply boxes 7 that are electrically connected to the drive assembly 5. An elliptical air vent 1-1 is opened on the mounting base plate 1. A sealing ring 8 is provided around the edge of the air vent 1-1. The damper plate 2 is also elliptical, and its bottom area is larger than the area of ​​the air vent 1-1 to ensure the effectiveness of the damper plate 2 in closing.

[0044] like Figure 3As shown, the drive assembly 5 is mounted on the support frame 3. The drive assembly 5 includes a rotating shaft 51, a rotor core 52, a magnet 53, and a stator 54. The rotating shaft 51 is a hollow variable diameter shaft, which includes a large diameter section 511 and a small diameter section 512. The rotor core 52 is mounted on the upper part of the large diameter section 511. A ring of cylindrical holes 5111 is evenly opened on the bottom surface of the large diameter section 511. The magnet 53 and the stator 54 are arranged in sequence outside the rotor core 52. A brake 55 is installed on the upper part of the small diameter section 512.

[0045] like Figure 4 As shown, the lifting assembly 4 has a ball screw 41 and a screw nut 42. The screw nut 42 is mounted on the ball screw 41 and fixed to the bottom surface of the large diameter section 511. The upper part of the ball screw 41 extends into the hollow part of the rotating shaft 51. The lower end of the ball screw 41 is connected to the guide plate 9. The guide plate 9 is fixed to the top center of the damper plate 2.

[0046] like Figure 5 As shown, the lead screw nut 42 is a hollow reducing component, comprising a large diameter section 421 and a small diameter section 422. The small diameter section 422 extends into the large diameter section 511, and the large diameter section 421 is located at the bottom of the large diameter section 511, with a connecting hole 4211 provided on it. The upper end of the ball screw 41 is connected to a first elastic limiting member 13 (made of rubber or nylon), and the upper end of the small diameter section 422 is glued with a second elastic limiting member 14 (made of rubber or nylon). The second elastic limiting member 14 is provided with a supporting step 141 that supports the first elastic limiting member 13. A notch 411 is symmetrically provided on the lower outer wall of the ball screw 41.

[0047] like Figure 4 and Figure 6 As shown, four guide rods 15 are installed between the guide plate 9 and the lower cover 503. The upper end of each guide rod 15 is fixedly connected to the lower cover 503, and the lower end of each guide rod 15 is mounted on the guide plate 9 through a linear bearing 16. An installation groove 91 is provided in the middle of the guide plate 9. A pair of screw fixing blocks 17 are provided in the installation groove 91. The screw fixing blocks 17 are inserted into the notch 411 and fixedly connected to the guide plate 9.

[0048] like Figure 3 and Figure 7 As shown, the cover 50 includes a housing 501, an upper cover 502, and a lower cover 503. The upper part of the housing 501 has a partition 5011. A first through hole 50111 is formed in the middle of the partition 5011 for a small-diameter section 512 of the rotating shaft 51 to pass through. An upper bearing 56, which is interference-fitted with the rotating shaft 51, is provided on the inner wall of the first through hole 50111. A brake 55 is disposed between the upper cover 502 and the partition 5011. Figure 8As shown, the lower cover 503 has a second through hole 5031 in the middle for the large diameter section 511 of the rotating shaft 51 to pass through. The second through hole 5031 is a variable diameter hole, which includes a large diameter part 50311 and a small diameter part 50312. The inner wall of the large diameter part 50311 is provided with a lower bearing 57 that is interference-fitted with the rotating shaft 51. The edge of the small diameter part 50312 extends downward to form a ring edge 5032 that is clearance-fitted with the lead screw nut 42.

[0049] like Figure 8 and Figure 9 As shown, a flexible waterproof sleeve 10 (which may be made of rubber) is provided between the lower cover 503 and the guide plate 9. The waterproof sleeve 10 has a tower-shaped structure, with an upper connecting edge 101 and a lower connecting edge 102 on its upper and lower edges, respectively. An annular groove 5033 is provided on the outer side of the bottom ring edge 5032 of the lower cover 503. A waterproof upper pressure plate 11 connected to the upper connecting edge 101 is provided in the annular groove 5033. A waterproof lower pressure plate 12 connected to the lower connecting edge 102 is provided on the upper surface of the guide plate 9.

[0050] The working principle is as follows: When the damper actuator in this embodiment receives a closing signal, the control box 6 controls the rotating shaft 51 to rotate in one direction, driving the lead screw nut 42 to rotate, causing the ball screw 41 to move downward, driving the linear bearing 16 to move downward together with the guide plate 9 and the damper plate 2. When the damper plate 2 is about to contact the sealing ring 8, the control box 6 controls the brake 55 to perform a braking action until the damper plate 2 is completely closed. At this time, the first elastic limiting member 13 at the upper end of the ball screw 41 is limited on the support step 141 of the second elastic limiting member 14 at the upper end of the lead screw nut 42, further reducing noise. When the opening signal is received, the control box 6 controls the rotating shaft 51 to rotate in the opposite direction, driving the damper plate 2 away from the air outlet 1-1. The control box 6 can control the rotating shaft 51 and the brake 55 to stop at any stroke position, accurately control the flow rate, and thus achieve the purpose of accurately controlling the air volume.

[0051] Furthermore, the damper actuator of this embodiment has undergone 2 million opening and closing tests, and its opening speed is consistently within 150ms, demonstrating rapid and effective response. Moreover, existing pressure wave protection devices / pressure wave valves typically have a damper plate on the outside of the mounting base. This is because a cylinder-driven damper plate cannot fully guarantee a tight seal after closure, and the outer damper plate requires separate control. In contrast, the damper actuator of this embodiment only requires a single damper plate to ensure a tight seal after closure.

[0052] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A damper actuator for a fresh air system in rail transit, characterized in that: The system includes a mounting base plate (1), a damper plate (2), a support frame (3), a lifting assembly (4), and a drive assembly (5) for driving the lifting assembly (4). The drive assembly (5) is mounted on the support frame (3). The drive assembly (5) includes a rotating shaft (51), a rotor core (52), a magnet (53), and a stator (54). The rotating shaft (51) is a hollow variable diameter shaft, which includes a large diameter section (511) and a small diameter section (512). The rotor core (52) is mounted on the upper part of the large diameter section (511). A circular ring of cylinders is evenly opened on the bottom surface of the large diameter section (511). A magnet (53) and a stator (54) are arranged in sequence outside the hole (5111) and the rotor core (52). A brake (55) is installed on the upper part of the small diameter section (512). The lifting assembly (4) has a ball screw (41) and a screw nut (42). The screw nut (42) is installed on the ball screw (41) and fixed on the bottom surface of the large diameter section (511). The upper part of the ball screw (41) extends into the hollow part of the rotating shaft (51). The lower end of the ball screw (41) is connected to the guide plate (9). The guide plate (9) is fixed in the middle of the top of the damper plate (2).

2. The damper actuator for the fresh air system of rail transit according to claim 1, characterized in that: The drive assembly (5) has a cover (50), which includes a housing (501), an upper cover (502) and a lower cover (503). The upper part of the housing (501) has a partition (5011). The partition (5011) has a first through hole (50111) in the middle for the small diameter section (512) of the rotating shaft (51) to pass through. The inner wall of the first through hole (50111) is provided with an upper bearing (56) that is interference-fitted with the rotating shaft (51). The brake (55) is disposed between the upper cover (502) and the partition (5011).

3. The damper actuator for the fresh air system of rail transit according to claim 2, characterized in that: The lower cover (503) has a second through hole (5031) in the middle for the large diameter section (511) of the rotating shaft (51) to pass through. The second through hole (5031) is a variable diameter hole, which includes a large diameter part (50311) and a small diameter part (50312). The inner wall of the large diameter part (50311) is provided with a lower bearing (57) that is interference-fitted with the rotating shaft (51). The edge of the small diameter part (50312) extends downward to form a ring edge (5032) that is clearance-fitted with the lead screw nut (42).

4. The damper actuator for the fresh air system of rail transit according to claim 3, characterized in that: A flexible waterproof sleeve (10) is provided between the lower cover (503) and the guide plate (9). The waterproof sleeve (10) has a tower-shaped structure, with an upper connecting edge (101) and a lower connecting edge (102) on its upper and lower edges, respectively.

5. The damper actuator for the fresh air system of rail transit according to claim 4, characterized in that: The bottom edge (5032) of the lower cover (503) has an annular groove (5033) on the outside. The annular groove (5033) is provided with a waterproof upper pressure plate (11) connected to the upper connecting edge (101). The upper surface of the guide plate (9) is provided with a waterproof lower pressure plate (12) connected to the lower connecting edge (102).

6. The damper actuator for the fresh air system of rail transit according to claim 2, characterized in that: The lead screw nut (42) is a hollow variable diameter component, which includes a large diameter section (421) and a small diameter section (422). The small diameter section (422) extends into the large diameter section (511). The large diameter section (421) is located at the bottom of the large diameter section (511) and a connecting hole (4211) is provided on the large diameter section (421).

7. The damper actuator for the fresh air system of rail transit according to claim 6, characterized in that: The upper end of the ball screw (41) is connected to a first elastic limiting member (13), and the upper end of the small diameter section (422) is glued with a second elastic limiting member (14). The second elastic limiting member (14) is provided with a supporting step (141) to support the first elastic limiting member (13). A notch (411) is symmetrically opened on the lower outer wall of the ball screw (41).

8. The damper actuator for the fresh air system of rail transit according to claim 7, characterized in that: Four guide rods (15) are installed between the guide plate (9) and the lower cover (503). The upper end of each guide rod (15) is fixedly connected to the lower cover (503), and the lower end of each guide rod (15) is installed on the guide plate (9) through a linear bearing (16). An installation groove (91) is provided in the middle of the guide plate (9). A pair of screw fixing blocks (17) are provided in the installation groove (91). The screw fixing blocks (17) are inserted into the notch (411) and fixedly connected to the guide plate (9).

9. The damper actuator for the fresh air system of rail transit according to claim 1, characterized in that: The support frame (3) includes a support plate (31) and support rods (32) fixedly installed on the four corners of the support plate (31). The two sides of the support plate (31) are folded upward to form a retaining edge (311). Several weight-reducing holes (312) are opened on the support plate (31).

10. The damper actuator for the fresh air system of rail transit according to claim 9, characterized in that: On the support plate (31), on both sides of the drive assembly (5), there are control boxes (6) and power supply boxes (7) that are electrically connected to the drive assembly (5). An elliptical air vent (1-1) is opened on the mounting base plate (1). A sealing ring (8) is provided on the edge of the air vent (1-1). The damper plate (2) is also elliptical, and its bottom area is larger than the area of ​​the air vent (1-1).

Images