Ceiling exhaust fan with motor cooling function

Abstract

The utility model provides a ceiling exhaust fan with motor heat dissipation function, which comprises a shell, a volute is installed in the shell, the volute has an air inlet communicated with an air inlet channel of the bottom of the shell and an air outlet communicated with an air outlet seat arranged on the side wall of the shell, the bottom of the shell is covered with a panel, the panel is provided with an air inlet channel communicated with the air inlet channel, the top of the volute is provided with a mounting cavity, a motor plate is fixedly installed in the mounting cavity, the motor plate is provided with a mounting seat, a driving motor is fixed to the mounting seat, the driving shaft of the driving motor extends into the volute and is connected with a fan wheel, at least one heat dissipation channel is formed in the mounting seat, the heat dissipation channel is communicated with the space in the mounting seat for accommodating the driving motor and the internal space of the volute. The utility model has the beneficial effects that a forced convection heat dissipation air path is constructed for the motor, and the motor is completely changed from being enclosed in static air and only being passively cooled in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of ventilation equipment technology, specifically a ceiling exhaust fan with motor cooling function. Background Technology

[0002] Ceiling exhaust fans are commonly used ventilation devices in modern buildings. They are usually installed on the ceilings of kitchens, bathrooms, and other places to quickly remove indoor moisture, stale air, fumes, or odors, and maintain indoor air circulation and freshness.

[0003] In existing ceiling exhaust fan structures, there is typically an outer casing, a volute housing inside the casing, and a drive motor that rotates the impeller. The drive motor is usually mounted independently on the outside of the volute housing, for example, fixed to the inner wall of the casing by a bracket. Its drive shaft passes through a pre-drilled opening in the volute housing, extending into the volute housing and connecting to the impeller. While this structure can achieve basic exhaust functionality, it has revealed significant design flaws in practical use, especially in terms of motor heat dissipation.

[0004] However, this traditional structural layout has the following significant drawbacks:

[0005] 1. Poor heat dissipation environment and severe heat accumulation. The drive motor generates a large amount of heat during prolonged operation. Because the motor body is enclosed in a relatively independent space between the outer casing and the volute, airflow in this area is extremely poor, making it almost a sealed environment. The heat generated by the motor can only be slowly dissipated to the surroundings through natural convection and thermal radiation, resulting in very low heat dissipation efficiency.

[0006] 2. Lack of a proper heat dissipation path, preventing the use of the main airflow for cooling. When an exhaust fan is working, its core function is to create a forced exhaust duct. Airflow is drawn in from the room through the panel's intake duct, accelerated and pressurized by the impeller within the casing, and finally exhausted through the exhaust port. In existing technology, the drive motor is completely isolated from this main exhaust duct. The high-speed airflow within the duct cannot contact the motor casing, thus preventing the use of forced convection to cool the motor.

[0007] 3. Shortened motor lifespan and reduced product reliability. Due to the reasons mentioned above, the heat generated by the motor during operation cannot be dissipated in a timely and effective manner, leading to excessively rapid temperature rise and prolonged operation at high temperatures. This not only reduces the motor's own efficiency and increases energy consumption, but more seriously, the high temperature accelerates the aging and failure of the insulation layer of the enameled coils and the bearing lubricant inside the motor, thus significantly shortening the motor's lifespan and potentially causing increased noise, ultimately affecting the reliability and durability of the entire exhaust fan product. Therefore, further improvements are necessary. Utility Model Content

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a ceiling exhaust fan with motor cooling function that has a more compact structure, can effectively and actively dissipate heat from the drive motor, so as to significantly reduce its operating temperature, extend its service life and improve the reliability of the whole machine.

[0009] The purpose of this utility model is achieved through the following means: a ceiling exhaust fan with motor cooling function, comprising a housing, a volute installed inside the housing, the volute having an air inlet communicating with an air inlet duct at the bottom of the housing, and an air outlet communicating with an air outlet seat provided on the side wall of the housing, the bottom of the housing being covered with a panel, the panel having an air inlet duct communicating with the air inlet duct; the top of the volute having a mounting cavity, in which a motor plate is fixedly installed;

[0010] The motor plate is provided with a mounting base, the drive motor is fixed to the mounting base, and the drive shaft of the drive motor extends into the volute and is connected to the impeller.

[0011] The mounting base is provided with at least one heat dissipation channel, which connects the space inside the mounting base used to accommodate the drive motor with the internal space of the volute.

[0012] Furthermore: the mounting base is an inner recess formed by the motor plate being integrally recessed towards the volute, and the inner recess extends towards its center to form a connecting ring; the housing of the drive motor is provided with a docking ring, which is connected to the connecting ring.

[0013] Furthermore, the heat dissipation channel is formed on the side wall of the recessed seat.

[0014] Furthermore, the docking ring is fixed to the connecting ring by a number of fixing screws that pass through the mounting holes on the connecting ring and screw into the threaded holes on the docking ring.

[0015] Furthermore, the outer peripheral edge of the motor plate extends integrally towards the volute to form a sealing ring, which abuts against the inner wall of the mounting cavity to form a seal.

[0016] Furthermore, at least one upper positioning post is provided on the top of the volute, which is supported on the inner top wall of the outer shell.

[0017] Furthermore, the side wall of the volute is provided with a positioning platform, which is supported on the inner side wall of the outer shell.

[0018] Furthermore, a positioning ear is provided at the bottom of the volute extending downwards, and the positioning ear is connected to the outer shell by a fixing screw.

[0019] Furthermore, there are two heat dissipation channels, symmetrically distributed on both sides of the mounting base.

[0020] The beneficial effects of this utility model are: 1. Simple structure, low production cost, and improved market competitiveness.

[0021] 2. At least one heat dissipation channel is cleverly designed into the mounting bracket of the drive motor, and this channel is directly connected to the internal space of the volute. When the exhaust fan is working, the suction force it generates forces external cool air to flow across the surface of the drive motor housing, then through the heat dissipation channel into the volute, and finally out with the main exhaust stream. This creates an active and efficient forced convection cooling airflow path for the motor, completely changing the predicament of existing technologies where the motor is enclosed in still air and can only passively dissipate heat.

[0022] 3. Due to the aforementioned active cooling airflow, the large amount of heat generated by the drive motor during operation can be quickly and continuously carried away by the flowing air, effectively preventing heat accumulation. This allows the motor to operate stably at a temperature far lower than that of traditional structures, greatly delaying the aging and failure of key components such as the internal coil insulation layer and bearing lubricant caused by high temperatures. This directly and significantly extends the service life of the drive motor and improves the overall stability and durability of the machine.

[0023] 4. By incorporating multiple positioning structures such as upper positioning posts, positioning platforms, and positioning ears, precise and stable support and fixation are provided for the installation of the volute within the outer casing 1. This design simplifies the assembly process, reduces installation difficulty, ensures product consistency, and helps improve production efficiency and reduce manufacturing costs. Attached Figure Description

[0024] Figure 1 This is a diagram showing the final assembly and usage effect of this utility model.

[0025] Figure 2 This is a schematic diagram of the structure behind the hidden panel of this utility model.

[0026] Figure 3 This is an exploded view of the outer shell and volute structure in this utility model.

[0027] Figure 4 This is a schematic diagram of the volute structure in this utility model.

[0028] Figure 5 This is an exploded view of the volute structure in this utility model.

[0029] Figure 6 This is an assembly diagram of the drive motor and motor board in this utility model. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings. A ceiling exhaust fan with motor cooling function includes a housing 1, and a volute 2 is installed inside the housing 1. The volute 2 has an air inlet that communicates with the air inlet duct 11 at the bottom of the housing 1, and an air outlet that communicates with the air outlet seat 3 provided on the side wall of the housing 1. The bottom of the housing 1 is covered with a panel 4, and an air inlet duct 41 communicating with the air inlet duct 11 is provided on the panel 4.

[0031] The top of the volute 2 is provided with a mounting cavity 21, and a motor plate 22 is fixedly installed in the mounting cavity 21.

[0032] The motor plate 22 is provided with a mounting base 23, and the drive motor 24 is fixed to the mounting base 23. The drive shaft of the drive motor 24 extends into the volute 2 and is connected to the impeller 25.

[0033] At least one heat dissipation channel 26 is provided on the mounting base 23, which connects the space inside the mounting base 23 used to accommodate the drive motor 24 with the internal space of the volute 2.

[0034] In this embodiment, when the exhaust fan is powered on, the drive motor 24 drives the impeller 25 inside the volute 2 to rotate at high speed. According to the principles of fluid mechanics, the rotation of the impeller 25 will draw in air from its central area, i.e., near the air inlet, forming a significant negative pressure zone. The key to this invention lies in the clever connection between the mounting cavity 21, which houses the drive motor 24, and this negative pressure zone inside the volute 2, through the heat dissipation channel 26 opened on the mounting base 23.

[0035] As a result, the negative pressure inside the volute will continuously draw air from the mounting cavity 21 through the heat dissipation channel 26, forcibly guiding the cooler external air to flow over the surface of the drive motor 24 housing, subjecting it to forced convection cooling, and then drawing it into the volute 2, and finally expelling it from the exhaust seat 3 along with the main exhaust stream.

[0036] Compared to traditional technologies, this design fundamentally solves the problem of excessive temperature rise caused by the passive cooling of traditional exhaust fan motors due to their enclosed space. It utilizes the negative pressure inevitably generated when the exhaust fan is working to establish an active and efficient cooling airflow path for the motor, greatly improving heat dissipation efficiency. This significantly reduces the motor's operating temperature, extends its service life, and improves the overall reliability of the machine.

[0037] In one embodiment: the mounting base 23 is an indented seat integrally recessed from the motor plate 22 toward the volute 2, and the indented seat extends toward its center to form a connecting ring 27; the housing of the drive motor 24 is provided with a docking ring 28, which is connected to the connecting ring 27.

[0038] In this embodiment, by designing the mounting base 23 as a recessed seat that extends integrally from the motor plate 22, a precise space is provided for accommodating and positioning the drive motor 24. The motor is connected to the connecting ring 27 at the bottom of the recessed seat via the mating ring 28 on its housing, thus achieving a stable fixation between the motor and the motor plate.

[0039] This "recessed seat + connecting ring / docking ring" design provides more precise coaxial positioning compared to simple bracket fixing, ensuring good alignment between the motor drive shaft and the impeller, which helps reduce operating vibration and noise. At the same time, the one-piece molded recessed seat structure is more robust and can provide stable support for the motor.

[0040] In one embodiment, the heat dissipation channel 26 is formed on the side wall of the recessed seat. In this embodiment, the heat dissipation channel 26 is set on the side wall of the recessed seat that houses the motor, so that the drawn-in cooling airflow can directly pass over the main heat-generating part of the drive motor 24 housing, namely the outer periphery where the motor stator winding is located, thereby achieving the most direct and efficient heat exchange.

[0041] Compared to placing the heat dissipation channel in other locations, this location optimizes the path of the cooling airflow, maximizing the cooling effect on the key heat-generating areas of the motor. This results in more targeted and effective heat dissipation.

[0042] In one embodiment, the docking ring 28 is fixed to the connecting ring 27 by a plurality of fixing screws that pass through the mounting holes 29 on the connecting ring 27 and are screwed into the threaded holes on the docking ring 28.

[0043] In this embodiment, the motor's mating ring 28 is securely locked onto the motor plate's connecting ring 27 using fixing screws. This not only provides strong clamping force to ensure the motor does not loosen during operation, but also facilitates assembly and disassembly, making it convenient for both mass production on the production line and subsequent maintenance and replacement.

[0044] In one embodiment: the outer peripheral edge of the motor plate 22 extends integrally toward the volute 2 to form a sealing ring 210, which abuts against the inner wall of the mounting cavity 21 to form a seal.

[0045] In this embodiment, a sealing ring 210 is provided around the motor plate 22 to block any gaps that may exist between the motor plate and the inner wall of the mounting cavity 21. This prevents outside air from leaking into the volute 2 through these unintended paths. This sealing structure greatly enhances the heat dissipation effect. It ensures that the negative pressure inside the volute can be concentrated on the heat dissipation channel 26, thereby guaranteeing the airflow and speed through the cooling air path on the motor surface and avoiding a decrease in heat dissipation efficiency due to air leakage.

[0046] In one embodiment: at least one upper positioning post 5 is provided on the top of the volute 2, which is supported on the inner top wall of the outer shell 1.

[0047] In this embodiment, the upper positioning post 5, extending from the top of the volute, serves as a support point against the inner top wall of the outer shell, thereby precisely controlling the vertical installation height of the volute. This provides accurate axial positioning, ensuring the correct spatial relationship between the volute and the outer shell, and laying the foundation for the precise assembly of other components. Simultaneously, it also provides support, enhancing the stability of the overall structure.

[0048] In one embodiment: the side wall of the volute 2 is provided with a positioning platform 6, which is supported on the inner side wall of the outer shell 1.

[0049] In this embodiment, a radial positioning method is added. Its working principle is to utilize the positioning platform 6 on the side wall of the volute, which contacts the inner side wall of the outer shell, thereby defining the position of the volute in the horizontal plane. Combined with the upper positioning post 5, this forms a multi-point, multi-dimensional positioning system that can very precisely fix the volute in the designed position, preventing it from shaking or shifting during transportation or operation, and ensuring the stability and sealing of the air duct system.

[0050] In one embodiment: the bottom of the volute 2 is provided with a positioning ear 7 extending downward, which is connected to the outer shell 1 by a fixing screw.

[0051] In this embodiment, after the volute is precisely positioned by the positioning pins and positioning platform, it is then securely locked to the outer shell 1 by screws on the positioning lugs 7. This is an assembly logic of "positioning first, then locking." It separates the positioning and locking functions, making the assembly process simpler and more precise. The final screw connection provides a firm and reliable final fixation for the entire volute assembly, ensuring the long-term stability of the structure.

[0052] In one embodiment, two heat dissipation channels 26 are provided, symmetrically distributed on both sides of the mounting base 23.

[0053] In this embodiment, by setting two symmetrical heat dissipation channels, cooling airflow can be evenly drawn in from both sides of the motor. Compared to a single or asymmetrical heat dissipation channel, the symmetrical layout allows for more uniform and balanced airflow across the motor surface, resulting in a more consistent cooling effect on the entire motor and preventing localized overheating. Simultaneously, the symmetrical structure is also mechanically more stable. This solution is one of the best implementation methods that balances heat dissipation efficiency and structural stability.

[0054] In summary, this utility model discloses a ceiling exhaust fan with optimized structure and motor cooling function.

[0055] Specifically, when the exhaust fan starts, the drive motor 24 drives the impeller 25 to rotate inside the volute 2, forming a stable negative pressure source in the central area of ​​the volute. The core of this invention is the establishment of a crucial channel connecting the space where the motor is located and the negative pressure zone of the volute through a heat dissipation channel 26 opened on the mounting base 23. Under the continuous suction of the negative pressure, external cold air is forcibly guided to flow over the surface of the drive motor 24, actively and forcibly cooled, and then discharged into the main exhaust channel.

[0056] To ensure the efficient operation of this core heat dissipation mechanism, this invention also uses a sealing ring 210 on the motor plate 22 to prevent air leakage, thus ensuring the efficiency of the heat dissipation airflow. Simultaneously, the "recessed seat" motor mounting structure and the multi-point positioning and locking system consisting of the upper positioning post 5, positioning platform 6, and positioning ear 7 ensure precise assembly of all components and a stable structure, providing a solid structural guarantee for the efficient, reliable, and long-life operation of the entire system. Therefore, it can be widely promoted and used.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A ceiling exhaust fan with motor cooling function, comprising a housing (1), a volute (2) installed inside the housing (1), the volute (2) having an air inlet communicating with an air inlet duct (11) at the bottom of the housing (1), and an air outlet communicating with an air outlet seat (3) disposed on the side wall of the housing (1), the bottom of the housing (1) being covered with a panel (4), the panel (4) having an air inlet duct (41) communicating with the air inlet duct (11), characterized in that: The top of the volute (2) is provided with an installation cavity (21), and a motor plate (22) is fixedly installed in the installation cavity (21). The motor plate (22) is provided with a mounting base (23), and the drive motor (24) is fixed to the mounting base (23). The drive shaft of the drive motor (24) extends into the volute (2) and is connected to the impeller (25). At least one heat dissipation channel (26) is provided on the mounting base (23), which connects the space inside the mounting base (23) used to accommodate the drive motor (24) with the internal space of the volute (2).

2. The ceiling exhaust fan with motor cooling function according to claim 1, characterized in that: The mounting base (23) is an inner recess formed by the motor plate (22) recessed in the direction of the volute (2), and the inner recess extends towards its center to form a connecting ring (27); the housing of the drive motor (24) is provided with a docking ring (28), which is connected to the connecting ring (27).

3. A ceiling exhaust fan with motor cooling function according to claim 2, characterized in that: The heat dissipation channel (26) is formed on the side wall of the recessed seat.

4. A ceiling exhaust fan with motor cooling function according to claim 2, characterized in that: The docking ring (28) is fixed to the connecting ring (27) by a number of fixing screws that pass through the mounting holes (29) on the connecting ring (27) and screw into the threaded holes on the docking ring (28).

5. A ceiling exhaust fan with motor cooling function according to claim 1, characterized in that: The outer peripheral edge of the motor plate (22) extends integrally with a sealing ring (210) towards the volute (2), and the sealing ring (210) abuts against the inner wall of the mounting cavity (21) to form a seal.

6. A ceiling exhaust fan with motor cooling function according to claim 1, characterized in that: The top of the volute (2) is provided with at least one upper positioning post (5), which is supported on the inner top wall of the outer shell (1).

7. A ceiling exhaust fan with motor cooling function according to claim 6, characterized in that: The side wall of the volute (2) is provided with a positioning platform (6), which is supported on the inner side wall of the outer shell (1).

8. A ceiling exhaust fan with motor cooling function according to claim 6, characterized in that: The bottom of the volute (2) is provided with a positioning ear (7) extending downwards, which is connected to the outer shell (1) by a fixing screw.

9. A ceiling exhaust fan with motor cooling function according to claim 1, characterized in that: There are two heat dissipation channels (26), which are symmetrically distributed on both sides of the mounting base (23).

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