Fresh air preheating device

Abstract

The utility model relates to the field of air conditioning unit equipment, in particular to a fresh air preheating device which comprises a case, an air inlet is formed in the top of one end of the case, an air outlet is formed in the other end of the case, a heating coil and a fan assembly are arranged in the case, and the fan assembly is arranged between the heating coil and the air outlet. A plurality of first electric heaters and a plurality of second electric heaters are arranged in the air inlet, and the temperature of air sucked into the air inlet is rapidly increased to a temperature suitable for working of the heating coil within a short time through the first electric heaters and the second electric heaters, so that the preheating effect is achieved, and the surface of the heating coil is prevented from frosting; the heat exchange efficiency is improved, the service life is prolonged, the second electric heater is arranged below the first electric heater, the second electric heater and the first electric heater are arranged in a staggered mode, it is ensured that heat is more evenly distributed in the air inlet, the heat exchange contact area with air is increased, and air heating is more even.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning unit equipment, and in particular to a fresh air preheating device. Background Technology

[0002] Air conditioning units utilize various heat and humidity control methods and air purification processes to achieve functions such as cooling, heating, dehumidification, humidification, and air purification, thereby achieving precise control over indoor temperature, humidity, and cleanliness. Currently, air conditioning units heat fresh air through heating coils after intake. However, if the temperature of the fresh air is low, frost will form on the surface of the heating coils, reducing heat exchange efficiency. Furthermore, excessively low fresh air temperatures can lead to excessive heat load on the heating coils, shortening their lifespan. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a fresh air preheating device that prevents frost from forming on the surface of the heating coil, improves heat exchange efficiency, and extends service life.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A fresh air preheating device includes a chassis with an air inlet at the top of one end and an air outlet at the other end. The chassis contains a heating coil and a fan assembly, which is located between the heating coil and the air outlet. The air inlet contains a plurality of first electric heaters and a plurality of second electric heaters, with the second electric heaters located below the first electric heaters and staggered from them.

[0006] Preferably, the first electric heater and the second electric heater have the same structure and are both PCT electric heaters.

[0007] Preferably, the PCT electric heater includes a PTC heating element and a mounting bracket. The mounting bracket has two brackets that are symmetrically connected to both ends of the PTC heating element. Several heat sinks are evenly arranged in the middle of the PTC heating element. A support plate is symmetrically provided on the inner side of the air inlet. The mounting bracket is fixedly connected to the upper side of the support plate by screws.

[0008] As a preferred option, the PTC heating element is made of barium titanate ceramic.

[0009] Preferably, the heat sink is made of aluminum alloy.

[0010] Preferably, the fan assembly includes a centrifugal fan and a motor, with the motor connected to the centrifugal fan via a belt drive.

[0011] Preferably, a bag filter is installed inside the chassis, and the bag filter is located on the side of the heating coil near the air inlet.

[0012] Preferably, the chassis is provided with a first access door, which is located on one side of the bag filter.

[0013] Preferably, the bag filter includes a non-woven filter bag and a shaping frame. The non-woven filter bag is connected to the side of the shaping frame near the heating coil. An upper slide rail and a lower slide rail are fixedly connected inside the housing. The top of the shaping frame is slidably connected to the upper slide rail, and its bottom is slidably connected to the lower slide rail.

[0014] Preferably, the chassis is provided with a second maintenance door, which is located on one side of the fan assembly.

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

[0016] This fresh air preheating device rapidly heats the air intake to a suitable temperature for the heating coil to operate using a first electric heater and a second electric heater, achieving a preheating effect, preventing frost formation on the heating coil surface, improving heat exchange efficiency, and extending service life. By placing the second electric heater below the first electric heater and staggering them, heat is more evenly distributed within the air intake, increasing the heat exchange contact area with the air and making the air heating more uniform. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0019] Figure 3 This is a schematic diagram showing the disassembled state of a bag filter.

[0020] Figure 4 This is a schematic diagram of the structure of the first electric heater and the second electric heater.

[0021] Figure 5 This is a schematic diagram of the support plate connection.

[0022] Figure 6 This is a schematic diagram showing the installation of the first and second electric heaters.

[0023] In the diagram: 1. Chassis; 2. Air inlet; 3. Air outlet; 4. Heating coil; 5. Fan assembly; 501. Centrifugal fan; 502. Motor; 503. Belt; 6. First electric heater; 601. PTC heating element; 602. Mounting bracket; 603. Heat sink; 604. Screw; 7. Second electric heater; 8. Bag filter; 801. Non-woven filter bag; 802. Shaping frame; 9. First inspection door; 10. Upper slide rail; 11. Lower slide rail; 12. Second inspection door; 13. Support plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-6 This utility model provides a technical solution: a fresh air preheating device, including a casing 1, with an air inlet 2 at the top of one end of the casing 1 and an air outlet 3 at the other end, and a heating coil 4 and a fan assembly 5 inside the casing 1. The fan assembly 5 is disposed between the heating coil 4 and the air outlet 3. The air inlet 2 is provided with a plurality of first electric heaters 6 and a plurality of second electric heaters 7. The second electric heaters 7 are disposed below the first electric heaters 6 and are staggered from the first electric heaters 6.

[0026] The first electric heater 6 and the second electric heater 7 rapidly heat the air intake 2 to a temperature suitable for the operation of the heating coil 4 within a short time, achieving a preheating effect, preventing frost from forming on the surface of the heating coil 4, improving the heat exchange efficiency of the heating coil 4, and extending the service life of the heating coil 4. By placing the second electric heater 7 below the first electric heater 6 and staggering the second electric heater 7 with the first electric heater 6, heat is ensured to be more evenly distributed in the air intake 2, increasing the heat exchange contact area with the air and making the air heating more uniform.

[0027] In order to prevent overheating, improve safety, increase heating speed and energy saving, in this embodiment, preferably, the first electric heater 6 and the second electric heater 7 have the same structure and are both PCT electric heaters.

[0028] The purpose is to enable the PCT electric heater to self-regulate temperature and heat up quickly. During use, as the temperature rises, the resistance increases, leading to a decrease in current, which automatically reduces the heating power. This prevents overheating by automatically reducing power when the heating temperature is too high, reducing safety issues caused by human error or electrical malfunctions, and improving safety. Moreover, it can automatically reduce power after reaching a certain temperature, avoiding unnecessary energy waste and improving energy efficiency. The PCT electric heater maintains temperature stability by automatically adjusting power, allowing it to maintain a constant temperature for a long time without excessive temperature fluctuations, thus achieving stable heating.

[0029] To facilitate further increasing the heat exchange contact area with air, making air heating more uniform, and improving heat exchange efficiency, in this embodiment, preferably, the PCT electric heater includes a PTC heating core 601 and a mounting bracket 602. Two mounting brackets 602 are provided and symmetrically connected to both ends of the PTC heating core 601. Several heat dissipation fins 603 are evenly arranged in the middle of the PTC heating core 601. A support plate 13 is symmetrically provided on the inner side of the air inlet 2. The mounting bracket 602 is fixedly connected to the upper side of the support plate 13 by screws 604.

[0030] The purpose is to connect the PTC heating element 601 to the power supply, so that current flows through the PTC heating element 601. Due to its low resistance, the current is relatively large, and the PTC heating element 601 begins to heat up. As the temperature rises, the resistance of the PTC heating element 601 gradually increases. When the temperature reaches a certain value, the resistance of the PTC heating element 601 increases to a sufficient extent, and the current flow rate decreases significantly. At this point, the heat generated and the heat lost are roughly balanced, and the temperature is maintained within a safe range to prevent overheating. By setting several heat sinks 603, the heat dissipation area is increased, thereby improving the heat exchange efficiency with the air and making the air heating more uniform.

[0031] To facilitate improvements in thermal stability, chemical stability, and electrical insulation, in this embodiment, the PTC heating element 601 is preferably made of barium titanate ceramic. The purpose is that the PTC heating element 601 made of barium titanate ceramic has a high positive temperature coefficient within a certain temperature range. As the temperature increases, the resistance of the material increases rapidly, thereby effectively controlling the heating process.

[0032] In order to improve thermal conductivity and heating efficiency, in this embodiment, the heat sink 603 is preferably made of aluminum alloy. The purpose is that aluminum alloy has high thermal conductivity, so that heat can be quickly transferred to the heating surface and improve heating efficiency.

[0033] In order to facilitate the airflow, in this embodiment, preferably, the fan assembly 5 includes a centrifugal fan 501 and a motor 502, and the motor 502 is connected to the centrifugal fan 501 via a belt 503.

[0034] The purpose is to drive the centrifugal fan 501 to rotate via the belt 503, thereby pushing the airflow from the air inlet 2 into the casing 1 and out through the air outlet 3.

[0035] In order to facilitate the filtration of dust in the air, in this embodiment, preferably, a bag filter 8 is provided inside the casing 1. The bag filter 8 is located on the side of the heating coil 4 near the air inlet 2, and its purpose is to filter the dust in the air through the bag filter 8.

[0036] In order to facilitate the maintenance or replacement of the bag filter 8, in this embodiment, preferably, the housing 1 is provided with a first maintenance door 9, which is located on one side of the bag filter 8. The purpose is to facilitate the maintenance or replacement of the bag filter 8 by opening the first maintenance door 9.

[0037] To facilitate further replacement of the bag filter 8, in this embodiment, preferably, the bag filter 8 includes a non-woven filter bag 801 and a shaping frame 802. The non-woven filter bag 801 is connected to the side of the shaping frame 802 near the heating coil 4. An upper slide rail 10 and a lower slide rail 11 are fixedly connected inside the housing 1. The top of the shaping frame 802 is slidably connected to the upper slide rail 10, and its bottom is slidably connected to the lower slide rail 11.

[0038] The purpose is to push and pull the shaping frame 802 so that it slides along the upper slide rail 10 and the lower slide rail 11, thereby moving the shaping frame 802 and the non-woven filter bag 801 out of the housing 1, achieving the effect of disassembly and facilitating the replacement of the bag filter 8.

[0039] In order to facilitate the maintenance or replacement of the fan assembly 5, in this embodiment, preferably, the casing 1 is provided with a second inspection door 12, which is located on one side of the fan assembly 5. The purpose is to facilitate the maintenance or replacement of the fan assembly 5 by opening the second inspection door 12.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fresh air preheating device comprising a cabinet (1), characterized in that: One end top of the cabinet (1) is provided with an air inlet (2), the other end is provided with an air outlet (3), and the inside is provided with a heating coil (4) and a fan assembly (5), the fan assembly (5) is arranged between the heating coil (4) and the air outlet (3), a plurality of first electric heaters (6) and a plurality of second electric heaters (7) are arranged in the air inlet (2), the second electric heater (7) is arranged below the first electric heater (6), and the first electric heater (6) is staggered.

2. The fresh air preheating device according to claim 1, characterized in that: The first electric heater (6) and the second electric heater (7) are the same structure and are PCT electric heaters.

3. The fresh air preheating device according to claim 2, characterized in that: The PCT electric heater includes a PTC heating core (601) and a mounting and fixing support (602), the mounting and fixing support (602) is provided with two and is symmetrically connected to the two ends of the PTC heating core (601), a plurality of heat dissipation fins (603) are uniformly arranged in the middle of the PTC heating core (601), the inner side of the air inlet (2) is symmetrically provided with a support plate (13), and the mounting and fixing support (602) is fixedly connected to the upper side of the support plate (13) through screws (604).

4. The fresh air preheating device according to claim 3, characterized in that: The material of the PTC heating core (601) is barium titanate ceramic.

5. The fresh air preheating device according to claim 3, characterized in that: The material of the heat dissipation fin (603) is aluminum alloy.

6. The fresh air preheating device according to claim 1, characterized in that: The fan assembly (5) includes a centrifugal fan (501) and a motor (502), and the motor (502) is drivingly connected with the centrifugal fan (501) through a belt (503).

7. The fresh air preheating device according to claim 1, characterized in that: The cabinet (1) is provided with a bag filter (8) inside, and the bag filter (8) is arranged on one side of the heating coil (4) close to the air inlet (2).

8. The fresh air preheating device according to claim 7, characterized in that: The cabinet (1) is provided with a first access door (9), and the first access door (9) is arranged on one side of the bag filter (8).

9. The fresh air preheating device according to claim 8, characterized in that: The bag filter (8) includes a non-woven fabric filter bag (801) and a shaping frame (802), the non-woven fabric filter bag (801) is connected to one side of the shaping frame (802) close to the heating coil (4), and the cabinet (1) is fixedly connected with an upper sliding rail (10) and a lower sliding rail (11), the top of the shaping frame (802) is slidingly connected with the upper sliding rail (10), and the bottom of the shaping frame (802) is slidingly connected with the lower sliding rail (11).

10. The fresh air preheating device according to claim 1, characterized in that: The cabinet (1) is provided with a second access door (12), and the second access door (12) is arranged on one side of the fan assembly (5).

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