PTC hot air blower

Abstract

The utility model relates to the technical field of carriage heating, specifically relates to PTC hot curtain fan, including strip shell, be equipped with air supply mechanism in strip shell, air supply mechanism includes two groups of cross flow fan, each group cross flow fan links with strip shell through fan frame, and the fan frame is shaped with grating plate, and strip shell is provided with the through -opening corresponding with two grating plates, each fan frame is equipped with dust scraping mechanism, and the lower end of strip shell is tapered and forms two narrow mouth that are symmetrically set, each narrow mouth is equipped with PTC core body, and the airflow that cross flow fan produces forms a hot air curtain that flows downward after PTC core body, the utility model discloses through the narrow mouth of the symmetric setting cross flow fan and strip shell lower end's adaptation, cooperate the sustained preheating design of PTC core body, can form two concentrated and flow downward hot air curtains when the door opening quickly, and this directional hot air curtain can directly build temperature barrier in the door area, effectively reduces the cold air entry amount, and the temperature fluctuation in the carriage is reduced obviously.

Description

Technical Field

[0001] This utility model relates to the field of vehicle heating technology, specifically to a PTC heat curtain fan. Background Technology

[0002] In low-temperature winter conditions, buses, as public transportation, experience frequent door openings, leading to a large influx of cold air directly into the passenger compartment. This causes a rapid drop in temperature, affecting passenger comfort and potentially increasing the heating load on the air conditioning system, thus increasing energy consumption. To alleviate this problem, some hot air supply devices for buses have been developed, but they still have many shortcomings that need to be addressed in practical applications.

[0003] Firstly, existing bus heating devices are mostly extensions of the overall heating air conditioning system inside the passenger compartment, lacking directional barrier design for the door area. The hot air generated is mostly diffused and cannot form a concentrated and stable downward hot air curtain when the doors are open. This has limited effect on blocking the intrusion of cold air and makes it difficult to effectively maintain a stable temperature inside the passenger compartment. As a result, the air conditioning system needs to operate at a high load continuously, leading to significant energy waste.

[0004] Secondly, due to the complex operating environment of buses, dust and debris in the air easily adhere to the surface of the air intake grille of the hot air device. The existing device needs to be manually disassembled and cleaned regularly. On the one hand, manual cleaning is time-consuming and labor-intensive, with high maintenance costs, and it is difficult to handle in a timely manner during bus operation intervals. On the other hand, grille blockage will cause a significant decrease in air intake, further weakening the hot air output effect, and may even cause the fan to overload and shorten the service life of the equipment. Utility Model Content

[0005] The purpose of this invention is to provide a PTC heat curtain fan.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The PTC heat curtain fan includes a horizontally arranged strip-shaped outer shell. An air supply mechanism is located inside the strip-shaped outer shell. The air supply mechanism includes two symmetrically arranged cross-flow fans. Each set of cross-flow fans is connected to the strip-shaped outer shell via a fan frame. The fan frame has a grille plate that covers the air inlet of the cross-flow fans. The strip-shaped outer shell has openings corresponding to the two grille plates. Each fan frame has a dust scraping mechanism that periodically scrapes off dust adhering to the surface of the grille plate. The lower end of the strip-shaped outer shell tapers to form two symmetrically arranged narrow openings. Each narrow opening contains a PTC core. The air outlet of each set of cross-flow fans faces the corresponding narrow opening, and the airflow produced by the cross-flow fans forms a downward-flowing heat curtain after passing through the PTC core.

[0008] To illustrate the specific structure of the dust scraping mechanism, it includes a scraper, a translation drive, and a speed reduction transmission. The translation drive includes a reciprocating screw, a limiting rod, and a slider. The reciprocating screw is rotatably connected to the fan frame, and its axial direction is aligned with the length direction of the cross-flow fan. The limiting rod is fixedly connected to the fan frame and is parallel to the reciprocating screw. The slider has a threaded sleeve fitted onto the reciprocating screw, and the threaded sleeve is threadedly engaged with the reciprocating screw. One end of the slider has a guide sleeve fitted onto the limiting rod. The scraper is vertically oriented, with its lower end fixedly connected to the slider and its upper end abutting against the outer wall of the corresponding grid plate. The speed reduction transmission connects the reciprocating screw to the impeller inside the corresponding cross-flow fan.

[0009] To demonstrate the specific structure of the speed reduction transmission component, the speed reduction transmission component includes a speed reducer, a synchronous belt, and two synchronous pulleys. The speed reducer is fixedly connected to the corresponding fan frame, and the speed reducer includes an input shaft and an output shaft. The input shaft of the speed reducer is coaxially fixedly connected to the impeller of the corresponding cross-flow fan. The two synchronous pulleys are coaxially fixedly connected to the reciprocating lead screw and the output shaft of the speed reducer, respectively. The synchronous belt is sleeved on the two synchronous pulleys.

[0010] In order to collect the scraped dust, the strip-shaped outer shell has two pull-out openings, and each pull-out opening is located below the corresponding through-hole. Each pull-out opening has a sliding strip-shaped pull-out box, and the top of each strip-shaped pull-out box has an open structure to accommodate the dust scraped off by the scraper.

[0011] In order to ensure that the airflow generated by the cross-flow fan can flow precisely to the corresponding narrow opening, the fan frame is formed with an air guide hood corresponding to the exhaust port of the cross-flow fan. Each air guide hood extends to the corresponding narrow opening, and a strip sealing plate is provided on the periphery of the air guide hood to fill the gap between it and the narrow opening.

[0012] In order to achieve real-time adjustment of the temperature and air volume of the hot air curtain, an electrical control module is fixedly installed inside the strip-shaped shell between two sets of cross-flow fans. The electrical control module includes a housing and an electrical control board. The electrical control board is fixedly installed inside the housing. A temperature sensor is fixedly installed in each of the narrow openings below the PTC core.

[0013] To facilitate separate power supply to the cross-flow fan, the control board, and the PTC core, the side wall of the strip-shaped housing is fixedly equipped with a high-voltage connector, a low-voltage connector, and a fan connector. The PTC core is electrically connected to an external power supply through the high-voltage connector, the control board is electrically connected to an external power supply through the low-voltage connector, and the two cross-flow fans are connected to an external power supply through the fan connector after being connected by an integrated circuit.

[0014] To facilitate the installation of the air supply mechanism, a strip-shaped mounting opening is provided on the top of the strip-shaped outer shell along its length, and a strip-shaped cover plate is fixedly provided to cover the strip-shaped mounting opening.

[0015] The beneficial effects of this utility model are:

[0016] Firstly, this utility model, through the symmetrical arrangement of cross-flow fans and the narrow opening at the lower end of the strip-shaped outer shell, combined with the continuous preheating design of the PTC core, can quickly form two concentrated and downward-flowing hot air curtains when the car door is opened. This changes the problem of poor hot air diffusion and blocking effect of existing devices. This directional hot air curtain can directly build a temperature barrier in the car door area, effectively reducing the amount of cold air entering, significantly reducing temperature fluctuations in the car, improving passenger comfort, and avoiding high-load operation of the air conditioning system, thus achieving energy saving and consumption reduction.

[0017] Secondly, this utility model utilizes a linkage design between the dust scraping mechanism and the cross-flow fan. By employing a reduction gear transmission component and a translation drive component to connect the impeller and the scraper, the scraper can reciprocate along the grille after the cross-flow fan starts, automatically scraping away the dust adhering to its surface. Simultaneously, the scraped dust is collected centrally through a strip-shaped pull-out box, preventing dust from scattering inside the strip-shaped outer shell. This not only eliminates the hassle of manual disassembly and cleaning, reducing maintenance time and costs, but also keeps the grille unobstructed at all times, ensuring a stable airflow to the cross-flow fan and preventing the reduction of the heat curtain effect and fan overload caused by insufficient airflow. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments of this utility model will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0021] Figure 3 This is a top view of the present invention;

[0022] Figure 4 for Figure 3 Sectional view along line AA;

[0023] Figure 5 for Figure 3 Sectional view along line BB;

[0024] Figure 6 A three-dimensional structural diagram of the cross-flow fan and dust scraping mechanism;

[0025] Figure 7 for Figure 6 A magnified view of the area indicated by A1 in the diagram;

[0026] Figure 8 A three-dimensional structural diagram to accommodate the housing and the electronic control board.

[0027] In the diagram: 1. Strip-shaped outer casing; 2. Cross-flow fan; 3. Fan frame; 4. Grille; 5. Through-hole; 6. Narrow opening; 7. PTC core; 8. Scraper; 9. Reciprocating screw; 10. Limiting rod; 11. Slider; 12. Threaded sleeve; 13. Guide sleeve; 14. Reducer; 15. Synchronous belt; 16. Synchronous pulley; 17. Pull-out port; 18. Strip-shaped pull-out box; 19. Air guide hood; 20. Strip-shaped sealing plate; 21. Receiving shell; 22. Electrical control board; 23. Temperature sensor; 24. High-voltage connector; 25. Low-voltage connector; 26. Fan connector; 27. Strip-shaped mounting port; 28. Strip-shaped cover plate. Detailed Implementation

[0028] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0030] refer to Figures 1 to 5 The PTC heat curtain fan shown includes a horizontally arranged strip-shaped outer shell 1. The strip-shaped outer shell 1 is equipped with an air supply mechanism, which includes two sets of symmetrically arranged cross-flow fans 2. Each set of cross-flow fans 2 is connected to the strip-shaped outer shell 1 through a fan frame 3. The fan frame 3 is formed with a grille plate 4 that covers the air inlet of the cross-flow fans 2. The strip-shaped outer shell 1 has openings 5 ​​corresponding to the two grille plates 4. Each fan frame 3 is equipped with a dust scraping mechanism that periodically scrapes off the dust attached to the surface of the grille plate 4. The lower end of the strip-shaped outer shell 1 tapers to form two symmetrically arranged narrow openings 6. Each narrow opening 6 is equipped with a PTC core 7. The air outlet of each set of cross-flow fans 2 faces the corresponding narrow opening 6, and the airflow produced by the cross-flow fans 2 forms a downward-flowing heat curtain after passing through the PTC core 7.

[0031] In actual use, this device is installed above the bus door. During the bus's operation, the PTC core 7 is always in working condition. When the door is opened, the two cross-flow fans 2 start simultaneously. The airflow produced by each cross-flow fan 2 flows through the narrow opening 6 and passes through the corresponding PTC core 7. Through the heating of the PTC core 7, the airflow forms a downward-flowing hot air curtain, which blocks the entry of cold air from the outside into the passenger compartment, thus preventing a sudden drop in the temperature of the passenger compartment.

[0032] When the cross-flow fan 2 is working, outside air flows into the air inlet of the cross-flow fan 2 through the inlet 5 and the grille plate 4 in sequence. During this process, the dust carried by the air will adhere to the surface of the grille plate 4. In order to prevent the dust from clogging the grille plate 4 and affecting the exhaust volume of the cross-flow fan 2, this device is equipped with a dust scraping mechanism. Whenever the cross-flow fan 2 is working, the dust scraping mechanism will scrape off the dust attached to the surface of the grille plate 4, ensuring that the cross-flow fan 2 has sufficient exhaust volume and ultimately forms a hot air curtain that blocks the outside cold air.

[0033] refer to Figure 6 and Figure 7 As shown, the dust scraping mechanism includes a scraper 8, a translation drive component, and a speed reduction transmission component. The translation drive component includes a reciprocating screw 9, a limiting rod 10, and a slider 11. The reciprocating screw 9 is rotatably connected to the fan frame 3, and the axial direction of the reciprocating screw 9 is consistent with the length direction of the cross-flow fan 2. The limiting rod 10 is fixedly connected to the fan frame 3, and the limiting rod 10 is parallel to the reciprocating screw 9. The slider 11 is fitted with a threaded sleeve 12 that is sleeved on the reciprocating screw 9, and the threaded sleeve 12 is threadedly engaged with the reciprocating screw 9. One end of the slider 11 is formed with a guide sleeve 13 that is sleeved on the limiting rod 10. The scraper 8 is vertically arranged, with its lower end fixedly connected to the slider 11 and its upper end attached to the outer wall of the corresponding grid plate 4. The speed reduction transmission component connects the reciprocating screw 9 to the impeller drive inside the corresponding cross-flow fan 2.

[0034] Two sets of cross-flow fans 2 start synchronously. When the cross-flow fan 2 starts, the impeller inside will drive the reciprocating screw 9 to rotate through the reduction transmission component. Through the threaded sleeve 12 that is threaded with the reciprocating screw 9 and the guide sleeve 13 that is slidably engaged with the limit rod 10, the slider 11 will reciprocate along the length direction of the cross-flow fan 2. The scraper 8 connected to the slider 11 will scrape off the dust attached to the surface of the grid plate 4 to prevent the dust from clogging the grid plate 4 and affecting the exhaust volume of the cross-flow fan 2.

[0035] refer to Figure 6 As shown, the speed reduction transmission component includes a speed reducer 14, a synchronous belt 15, and two synchronous pulleys 16. The speed reducer 14 is fixedly connected to the corresponding fan frame 3, and the speed reducer 14 includes an input shaft and an output shaft. The input shaft of the speed reducer 14 is coaxially fixedly connected to the impeller of the corresponding cross-flow fan 2. The two synchronous pulleys 16 are coaxially fixedly connected to the reciprocating screw 9 and the output shaft of the speed reducer 14, respectively. The synchronous belt 15 is sleeved on the two synchronous pulleys 16.

[0036] When the cross-flow fan 2 is started, the impeller inside will drive the corresponding synchronous pulley 16 to rotate through the transmission of the reducer 14. Finally, through the transmission of the synchronous belt 15, another synchronous pulley 16 will drive the reciprocating screw 9 to rotate slowly. When the reciprocating screw 9 rotates, the slider 11 will drive the scraper to move back and forth, thereby scraping off the dust on the surface of the grid plate 4.

[0037] refer to Figure 2 and Figure 6 As shown, the strip-shaped outer shell 1 has two pull-out openings 17, and each pull-out opening 17 is located below the corresponding through opening 5. Each pull-out opening 17 has a sliding strip-shaped pull-out box 18. The top of each strip-shaped pull-out box 18 is an open structure, which is used to accommodate the dust scraped off by the scraper 8.

[0038] After the scraper 8 scrapes off the dust attached to the surface of the grid plate 4, the dust will fall into the strip pull box 18. The strip pull box 18 collects the dust and prevents the dust from falling directly into the strip shell 1. In actual use, the strip pull box 18 needs to be pulled out periodically to clean the dust inside.

[0039] refer to Figure 5 As shown, the fan frame 3 is formed with air guide hoods 19 corresponding to the exhaust outlet of the cross-flow fan 2. Each air guide hood 19 extends toward the corresponding narrow opening 6. The periphery of the air guide hood 19 is provided with a strip sealing plate 20 to fill the gap between it and the narrow opening 6.

[0040] When the cross-flow fan 2 is started, the airflow it generates will be precisely directed to the corresponding narrow opening 6 along the air guide shroud 19. During this process, the strip sealing plate 20 is used to prevent the airflow from escaping from the gap between the air guide shroud 19 and the narrow opening 6.

[0041] refer to Figure 4 and Figure 8 As shown, an electrical control module is fixedly installed inside the strip-shaped housing 1 between the two sets of cross-flow fans 2. The electrical control module includes a housing 21 and an electrical control board 22. The electrical control board 22 is fixedly installed inside the housing 21. A temperature sensor 23 located below the PTC core 7 is fixedly installed in each narrow opening 6.

[0042] The electronic control board 22 adjusts the power of the corresponding PTC core 7 and the air speed of the air supply module through the feedback signal of the temperature sensor 23 to achieve automatic temperature control and automatic air volume control.

[0043] refer to Figure 1 and Figure 4 As shown, the side wall of the strip-shaped housing 1 is fixed with a high-voltage connector 24, a low-voltage connector 25 and a fan connector 26. The PTC core 7 is electrically connected to an external power supply through the high-voltage connector 24, the control board 22 is electrically connected to an external power supply through the low-voltage connector 25, and the two cross-flow fans 2 are connected to an external power supply through the fan connector 26 after being connected by an integrated circuit.

[0044] The high-voltage connector 24 transmits high-voltage operating power to the PTC core 7, adapting to the high-power heating requirements of the PTC core 7, and has high-voltage insulation characteristics. The low-voltage connector 25 provides power for the low-voltage transmission operation of the control board 22, realizing data interaction and operation control between the control board 22 and various components.

[0045] refer to Figure 1 As shown, a strip-shaped mounting opening 27 is provided on the top of the strip-shaped outer shell 1 along its length direction, and a strip-shaped cover plate 28 is fixedly provided to cover the strip-shaped mounting opening 27.

[0046] The cross-flow fan 2 is inserted into the strip-shaped housing 1 through the strip-shaped mounting port 27. After the cross-flow fan 2 is fixed, the strip-shaped cover plate 28 is fixed to the strip-shaped mounting port 27 to cover it.

[0047] This device is installed above the bus door. Its core function is to create a downward-facing hot air curtain when the door is open, blocking cold air from entering and maintaining the temperature inside the bus. Its working principle is as follows:

[0048] The PTC core 7 is always in a heated state. When the bus door is opened, the two symmetrically arranged cross-flow fans 2 start simultaneously. Outside air enters through the opening 5 of the strip shell 1, is filtered by the grille plate 4 on the fan frame 3, and flows into the air inlet of the cross-flow fan 2. The airflow produced by the cross-flow fan 2 is guided by the air guide shroud 19 of the fan frame 3 and flows precisely to the narrow opening 6 at the lower end of the strip shell 1. When the airflow passes through the PTC core 7 in the narrow opening 6, it is rapidly heated, and finally forms a downward hot air curtain to block the cold air from outside the vehicle.

[0049] When the cross-flow fan 2 is working, dust in the air is easily attached to the surface of the grille plate 4, which may cause air intake blockage. Therefore, after the fan is started, its internal impeller drives the reciprocating screw 9 to rotate through the reducer 14. When the reciprocating screw 9 rotates, the slider 11 that is threaded with it moves back and forth along the length of the cross-flow fan 2 under the guidance of the limit rod 10. The vertical scraper 8 that is fixed to the slider 11 moves synchronously to scrape off the dust on the surface of the grille plate 4. The scraped dust falls directly into the pull-out strip box 18 below. The strip box 18 can be pulled out and cleaned periodically.

[0050] Temperature sensor 23 collects hot air temperature in real time and transmits the signal to the control board 22 between the two sets of cross-flow fans 2. The control board 22 automatically adjusts the heating power of PTC core 7 and the air delivery speed of cross-flow fans 2 according to the feedback signal to achieve dynamic matching of hot air curtain temperature and air volume. In terms of power supply, high-voltage connector 24 provides high-voltage power to PTC core 7 to adapt to high-power heating, and low-voltage connector 25 provides low-voltage power required for data interaction and control to control board 22. Cross-flow fans 2 are powered through fan connector 26 via integrated circuit to ensure power supply matching of each component.

[0051] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A PTC heat curtain fan, characterized in that, The device includes a horizontally arranged strip-shaped shell (1), which is equipped with an air supply mechanism. The air supply mechanism includes two sets of symmetrically arranged cross-flow fans (2). Each set of cross-flow fans (2) is connected to the strip-shaped shell (1) through a fan frame (3). The fan frame (3) is formed with a grid plate (4) that covers the air inlet of the cross-flow fans (2). The strip-shaped shell (1) has openings (5) corresponding to the two grid plates (4). Each fan frame (3) is equipped with a dust scraping mechanism that periodically scrapes off the dust attached to the surface of the grid plate (4). The lower end of the strip-shaped shell (1) gradually narrows to form two symmetrically arranged narrow openings (6). Each narrow opening (6) is equipped with a PTC core (7). The air outlet of each set of cross-flow fans (2) faces the corresponding narrow opening (6). The airflow produced by the cross-flow fans (2) forms a downward-flowing hot air curtain after passing through the PTC core (7).

2. The PTC heat curtain fan according to claim 1, characterized in that, The dust scraping mechanism includes a scraper (8), a translation drive component, and a speed reduction transmission component. The translation drive component includes a reciprocating screw (9), a limiting rod (10), and a slider (11). The reciprocating screw (9) is rotatably connected to the fan frame (3), and the axial direction of the reciprocating screw (9) is consistent with the length direction of the cross-flow fan (2). The limiting rod (10) is fixedly connected to the fan frame (3), and the limiting rod (10) is parallel to the reciprocating screw (9). The slider (11) contains... A threaded sleeve (12) is embedded in the reciprocating screw (9), and the threaded sleeve (12) is threadedly engaged with the reciprocating screw (9). One end of the slider (11) is formed with a guide sleeve (13) fitted onto the limiting rod (10). The scraper (8) is vertically arranged, with its lower end fixed to the slider (11) and its upper end attached to the outer wall of the corresponding grid plate (4). The speed reduction transmission component connects the reciprocating screw (9) with the impeller inside the corresponding cross-flow fan (2).

3. The PTC heat curtain fan according to claim 2, characterized in that, The speed reduction transmission component includes a speed reducer (14), a synchronous belt (15), and two synchronous pulleys (16). The speed reducer (14) is fixedly connected to the corresponding fan frame (3), and the speed reducer (14) includes an input shaft and an output shaft. The input shaft of the speed reducer (14) is coaxially fixedly connected to the impeller of the corresponding cross-flow fan (2). The two synchronous pulleys (16) are coaxially fixedly connected to the reciprocating screw (9) and the output shaft of the speed reducer (14), respectively. The synchronous belt (15) is sleeved on the two synchronous pulleys (16).

4. The PTC heat curtain fan according to claim 2, characterized in that, The strip-shaped outer shell (1) has two pull-out openings (17), and each pull-out opening (17) is located below the corresponding opening (5). Each pull-out opening (17) has a sliding strip-shaped pull-out box (18), and the top of each strip-shaped pull-out box (18) is an open structure to accommodate the dust scraped off by the scraper (8).

5. The PTC heat curtain fan according to claim 1, characterized in that, The fan frame (3) is formed with a guide hood (19) corresponding to the exhaust port of the cross-flow fan (2). Each guide hood (19) extends toward the corresponding narrow opening (6). The periphery of the guide hood (19) is provided with a strip sealing plate (20) to fill the gap between it and the narrow opening (6).

6. The PTC heat curtain fan according to claim 1, characterized in that, An electrical control module is fixedly installed inside the strip-shaped outer shell (1) between the two sets of cross-flow fans (2). The electrical control module includes a housing (21) and an electrical control board (22). The electrical control board (22) is fixedly installed inside the housing (21). A temperature sensor (23) is fixedly installed below the PTC core (7) in each of the narrow openings (6).

7. The PTC heat curtain fan according to claim 6, characterized in that, The side wall of the strip-shaped shell (1) is fixedly provided with a high-voltage connector (24), a low-voltage connector (25) and a fan connector (26). The PTC core (7) is electrically connected to an external power supply through the high-voltage connector (24). The power control board (22) is electrically connected to an external power supply through the low-voltage connector (25). The two cross-flow fans (2) are connected to an external power supply through the fan connector (26) after being connected by an integrated circuit.

8. The PTC heat curtain fan according to claim 1, characterized in that, The top of the strip-shaped outer shell (1) has a strip-shaped mounting opening (27) along its length direction, and a strip-shaped cover plate (28) is fixedly provided to cover the strip-shaped mounting opening (27).

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