Cooling and heating dual-purpose fan

Abstract

The utility model relates to a cooling and heating dual-purpose fan which comprises a base and a machine shell installed on the base. The machine shell is arranged to be an assembly defined by an air outlet grid, an air channel and an air inlet grid. A motor, a heating body and fan blades are sequentially arranged in the inner space of the machine shell from back to front, the heating body is located in the air channel, an air pipe is arranged on the radial periphery of the fan blades, the inner diameter of the air pipe is smaller than that of the air channel, and the air pipe serves as a component enabling the circulation section in the air channel to be changed and extends forwards in the axial direction of the motor to wrap the front ends of the fan blades. The air pipe extends backwards till the rear end of the fan blade is at most exposed out of one third of the length of the fan blade in the direction of the motor shaft, the maximum extending length is that the projection area does not cover the heating body, and an air circulation opening located on the radial periphery of the heating body is formed between the rear end of the air pipe and the air inlet grid. According to the fan, the decibel value of overall noise is low, the audio frequency of the noise is low, the melodious degree is relatively improved, meanwhile, safety and warm air performance are considered, the material requirement is low, and the overall weight is light.

Description

Technical Field

[0001] This utility model relates to a pumping device for fluids, and more particularly to a dual-purpose fan for both heating and cooling. Background Technology

[0002] Traditional air coolers use a motor to drive the fan blades to rotate and generate a cooling circulation flow in the home space for cooling in summer. Heaters use a heating element installed in front of the fan blade assembly to generate a hot airflow for heating in winter.

[0003] Currently, there are combinations of cooling fans and heaters, with the heating element typically positioned between the motor and the fan blades. From the perspective of the air outlet, users primarily see the fan blades rotating, similar to traditional fans, leading to greater acceptance of the combination concept. These combined devices are generally called dual-purpose cooling and heating fans. While dual-purpose fans can save space in the home, the heating element usually uses a heating wire wound into a ring to achieve sufficient temperature to heat the airflow. Since the heating wire is located along the fan blade axis, wind resistance can cause noise issues. Furthermore, the addition of a heating element introduces safety requirements for the fan.

[0004] CN205805957U discloses a dual-purpose electric fan for both heating and cooling. The motor, heating wire, and fan blades are arranged from back to front. The heating wire is in the open space, and the heat diffusion is not constrained, which affects the heating performance. Although there are grids and diamond meshes around the radial periphery of the heating wire to prevent fingers from sticking in, the mesh size cannot be made small due to the air intake requirements. Small foreign objects can easily fall onto the heating wire, causing safety hazards. It is difficult to solve the noise problem while taking into account both safety and heating performance.

[0005] CN108999796B discloses a dual-purpose electric circulating fan for both natural wind and warm air. The motor, heating wire, and fan blades are arranged in sequence. A guide ring is arranged radially around the heating wire to guide the airflow, which can prevent foreign objects from falling and increase the heat utilization rate, but cannot solve the noise problem. Utility Model Content

[0006] This invention provides a dual-purpose fan for both cooling and heating, in order to overcome the shortcomings of the existing technology.

[0007] As a solution, the present invention provides a cooling and heating fan including a base and a housing mounted on the base; the housing is configured as an assembly formed by an air outlet grille, an air duct, and an air inlet grille; the internal space of the housing has at least a motor, a heating element, and a fan blade arranged sequentially from back to front, the heating element being located inside the air duct, and a duct being arranged radially around the fan blade, the inner diameter of the duct being smaller than the inner diameter of the air duct to act as a component that changes the flow cross-section within the air duct, the duct extending forward along the motor axis to cover the front end of the fan blade, and the duct extending backward to such that at most 1 / 3 of the length of the fan blade along the motor axis is exposed at the rear end, and the maximum extension length is such that the projected area does not cover the heating element, and an air flow opening located radially around the heating element is provided between the rear end of the duct and the air inlet grille.

[0008] The cooling and heating fan provided by this utility model also includes the following auxiliary solutions:

[0009] The fan blade and its radially surrounding duct are located inside the air duct. The air duct acts as a separator, dividing the space inside the air duct for airflow into a first space located inside the air duct and a second space located outside the air duct. The gas flow opening serves as a channel connecting the first space and the second space.

[0010] The duct is provided with at least one rearward-extending first support rib, the end of which has an installation structure, and the duct is fixed to the rear section of the housing through the installation structure.

[0011] The motor is mounted on the air inlet grille; and / or the air inlet grille is mounted to the base via an angle adjustment mechanism.

[0012] The fan blades and the duct are concentric.

[0013] The mounting structure includes at least one second support rib extending toward the motor shaft, with a bearing seat at the end of the second support rib, and the heating element is fixed to the bearing seat.

[0014] The front end of the duct is connected to the edge of the air outlet grille, or the duct and the air outlet grille are integrally formed, and the rear end of the duct is either suspended or connected to the casing.

[0015] In this context, the air duct serves as an inner wall component of the air duct; or the outer wall of the air duct has a connecting structure, through which the air duct is fixed to the air duct.

[0016] The inner wall of the duct is at least tilted relative to the motor axis.

[0017] In the inclined configuration, the diameter of the duct gradually increases from back to front, and the inclination angle is between 0.2° and 8°.

[0018] The air intake grille can be integrated with or separated from the air duct.

[0019] The duct extends forward along the motor axis to connect with the air outlet grille or forms a gap of less than 20mm with the air outlet grille.

[0020] The structure of this utility model of a cooling and heating fan results in a low overall decibel level and low noise frequency, which improves the pleasantness of the sound. At the same time, it takes into account safety, heating performance, low material requirements, and light overall weight. Attached Figure Description

[0021] Figure 1 A cross-sectional view of the entire unit of the first embodiment of the cooling and heating fan of this utility model is provided;

[0022] Figure 2 A partial exploded view of the first embodiment of the cooling and heating fan of this utility model is provided;

[0023] Figure 3 A structural diagram of the air duct of the first embodiment of the cooling and heating fan of this utility model is provided;

[0024] Figure 4 A cross-sectional view of the entire unit of the second embodiment of the cooling and heating fan of this utility model is provided;

[0025] Figure 5 A partial exploded view of the second embodiment of the cooling and heating fan of this utility model is provided;

[0026] Figure 6 A structural diagram of the air duct of the second embodiment of the present invention's heating and cooling fan is provided;

[0027] Figure 7 A cross-sectional view of the entire unit of the third embodiment of the cooling and heating fan of this utility model is provided;

[0028] Figure 8 A partial exploded view of the third embodiment of the cooling and heating fan of this utility model is provided;

[0029] Figure 9 A structural diagram of the air duct of the third embodiment of the cooling and heating fan of this utility model is provided. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0031] Example 1

[0032] The cooling and heating fan in this embodiment is as follows: Figures 1 to 3As shown, the device includes a base 100 and a housing 200. The base 100 serves as a support, with a built-in rotating chassis enabling circumferential rotation. A human-machine interface device is installed on the base 100 to execute operator commands. The housing 200 is mounted on the base 100 and includes a front section 210 and a rear section 220. The front section 210 and the rear section 220 can be installed as a single unit or separately and then installed together. Multiple sections can be installed between the front section 210 and the rear section 220. The front section 210 serves as an air duct, restricting heat diffusion and airflow. The rear section 220 is an air inlet grille 221, and the front section 210 houses an air outlet grille 211. The air outlet grille 211 is detachably installed on the front section 210 via a rear flange structure, allowing for easy removal and cleaning by the user.

[0033] With the air inlet at the rear and the air outlet at the front, the internal space of the casing 200 contains, from rear to front, a motor 300, a heating element 400, and a fan blade 500 arranged sequentially. The heating element 400 uses a double-coil heating wire to provide sufficient heat. The heating element 400 is located within the air duct and its heat radiation is constrained by the air duct at the front end 210. The shaft of the motor 300 passes through the heating element 400 and connects to the fan blade 500. The fan blade 500, as a rotating body, is coaxial with the motor 300. A duct 510 is arranged radially around the fan blade 500. The inner diameter of the duct 510 is smaller than the inner diameter of the air duct, serving as a component that changes the cross-sectional area of ​​the airflow within the air duct. The duct 510 extends forward along the motor axis to wrap around the front end of the fan blade 500. The duct 510 extends backward so that at most one-third of the rear end of the fan blade 500 protrudes along the motor axis, and the maximum extension length is such that the projected area does not cover the heating element 400. An air flow opening 600 is provided between the rear end of the air duct 510 and the rear section 220 of the housing, located radially around the heating element 400.

[0034] By leveraging the coordination between the fan blade 500, duct 510, air duct, airflow opening 600, and heating element 400, the fan achieves several advantages: 1. The presence of the airflow opening 600 allows the heating element 400 to radially inflate, and the cross-sectional area of ​​the heating element 400 in the airflow duct is larger than that of the fan blade 500, creating a cross-sectional change. The forward and backward extension of the duct 510 helps to increase the area of ​​the airflow opening 600, avoiding noise caused by excessively exposed fan blades. At the same time, the notch around the radial periphery of the heating element 400 reduces the pressure difference before and after the fan blades, making the airflow behind the fan blades more uniform and reducing the vibration of the fan blades. Ultimately, this reduces the overall decibel level of the fan noise, and the frequency of the noise also decreases, making the noise sound softer and more pleasant to the ear. In actual testing, fan noise decreased from 50.4-58.1 dB to 44.2-48.1 dB. The decibel level is exponential and non-linear; the change from 50.4-58.1 dB to 44.2-48.1 dB significantly reduces noise impact. 2. The heat radiation of the heating element 400 is constrained by the air duct, balancing heat utilization. Simultaneously, the heating element 400 is located in the middle of the housing 200, with a radial shield at the front section 210 to prevent foreign objects from falling in, ensuring safety and heating performance. 3. When the fan blade 500 malfunctions and does not rotate, it is necessary to prevent the heating element 400 from baking the radially surrounding materials. Previously, materials required high heat resistance; the opening design increases the spatial distance between the materials and the heating element 400, reducing the requirements for the materials themselves. 4. The opening design reduces material usage and lowers the weight of the housing; the weight requirement for the base 100 can be reduced significantly.

[0035] As an improvement, the fan blade 500 and its radially surrounding duct 510 are also located within the air duct. The duct 510 acts as a separator, dividing the space within the air duct used for airflow into a first space located inside the duct 510 and a second space located outside the duct 510. The two spaces are connected, and the gas flow opening 600 serves as a connecting channel. Together with the air outlet grille 211 installed at the front end of the air duct, it forms a local vortex, further reducing noise.

[0036] As another improvement, in this embodiment, the duct 510 is provided with at least one rearward-extending first support rib 511. Preferably, there are two or more first support ribs 511, forming a circumferential distribution, and the slender structure of the ribs maximizes the opening area for gas flow. The end of the first support rib 511 has a mounting structure 512, which can be fastened to the front edge of the rear section 220 of the housing by screws using a fixing component. The duct 510 is fixed to the rear section 220 of the housing through the mounting structure 512. The rearward installation of the duct 510 to the rear section 220 of the housing ensures structural stability and tightness, reduces the possibility of loosening and increased noise due to wind, and is also convenient for installation. Furthermore, the motor 300 is installed in the rear section 220 of the housing, and the rear section 220 of the housing is installed to the base 100 through an adjustable tilt angle mechanism. All moving parts are located in the rear section, with the motor shaft connected to the fan blade 500 facing forward, and the duct 510 extending rearward and fixed to the rear section, enhancing overall stability. Since the motor 300 is installed at the rear, it is easier to make the fan blade 500 and the air duct 510 concentric, reducing noise and increasing air volume.

[0037] Preferably, the mounting structure 512 is provided with at least one second support rib 513 extending in the direction of the motor shaft. The end of the second support rib 513 has a bearing seat 514. The heating element 400 is fixed to the bearing seat 514. The weight of the heating element 400 is supported by the rear load, which ensures the life of the motor 300 and the smooth rotation of the fan blade 500, ensures the stability of the heating element 400, and is beneficial to noise control.

[0038] As another improvement, the inner wall of the duct 510 is inclined at least relative to the motor axis, and the air supply range or air supply distance of the machine is controlled by setting the angle. Specifically, the inclination is set such that the diameter of the duct 510 gradually increases from back to front to form a negative angle, and the inclination angle of the negative angle is between 0.2° and 8°, which is beneficial to increase the air outlet surface and improve the air outlet wide angle.

[0039] In this embodiment, the duct 510 extends forward along the motor axis to connect with the air outlet grille to enhance front-end stability, or the duct 510 extends forward along the motor axis to form a gap of less than 20mm with the air outlet grille.

[0040] Example 2

[0041] See Figures 4 to 6 In Example 2, based on Example 1, the installation method of the air duct 500 is changed to the front end of the air duct 510 being connected to the edge of the air outlet grille or the air duct 510 being integrally formed with the air outlet grille, and the rear end of the air duct 510 being a suspended end or the rear end of the air duct 510 being connected to the housing 200 by fixing or supporting.

[0042] In this structural design, the duct 510 does not have rearward-extending support ribs; instead, it is connected and installed via the front air outlet grille 211. The advantage is that when the front casing of the machine is removed for cleaning, the duct 510 is also removed simultaneously, fully exposing the fan blades 500 for easier cleaning. The disadvantage is that the fan blades 500 and the duct 510 are not fixed to the same component, which can easily lead to misalignment during installation, resulting in increased machine noise and reduced airflow.

[0043] Example 3

[0044] See Figures 7 to 9 In Example 3, based on Example 1, the installation method of the duct 500 is changed to the duct 510 being an inner wall component of the front section of the housing 200; or the outer wall of the duct 510 has a connecting structure, and the duct 510 is fixed to the front section of the housing 200 through the connecting structure. This structural solution involves a structure extending from the outside of the duct 510 and being installed with the front section of the housing, or being integrated with the front section and fixed to the rear section by the front section. The advantages are simple structure and reduced weight. However, it is determined that the center of gravity of the front section shifts forward, reducing stability.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A dual-purpose fan for both cooling and heating, characterized in that: Includes the base and the housing mounted on the base; The casing is configured as an assembly consisting of an exhaust grille, an air duct, and an intake grille. The internal space of the casing has at least a motor, a heating element, and a fan blade arranged sequentially from back to front. The heating element is located inside the air duct. A duct is arranged radially around the fan blade. The inner diameter of the duct is smaller than the inner diameter of the air duct, thus serving as a component that changes the flow cross-section within the air duct. The duct extends forward along the motor axis to cover the front end of the fan blade. The duct extends backward so that at most 1 / 3 of the fan blade's length along the motor axis is exposed at the rear end of the fan blade. The maximum extension length is such that the projected area does not cover the heating element. An air flow opening is provided between the rear end of the duct and the air inlet grille, located radially around the heating element.

2. The dual-purpose cooling and heating fan according to claim 1, characterized in that: The fan blade and its radially surrounding duct are located inside the air duct. The air duct acts as a separator, dividing the space within the air duct used for airflow into a first space located inside the air duct and a second space located outside the air duct. The gas flow opening serves as a channel connecting the first space and the second space.

3. The dual-purpose cooling and heating fan according to claim 1, characterized in that: The duct is provided with at least one rearward-extending first support rib, the end of which has an installation structure, and the duct is fixed to the air inlet grid through the installation structure.

4. The dual-purpose cooling and heating fan according to claim 3, characterized in that: The motor is mounted on the air inlet grille; and / or the air inlet grille is mounted to the base via an angle adjustment mechanism.

5. The dual-purpose cooling and heating fan according to claim 4, characterized in that: The fan blades and the duct are concentric.

6. The dual-purpose cooling and heating fan according to claim 3, characterized in that: The mounting structure is provided with at least one second support rib extending in the direction of the motor shaft, and the end of the second support rib has a bearing seat, and the heating element is fixed to the bearing seat.

7. The dual-purpose cooling and heating fan according to claim 1, characterized in that: The front end of the duct is connected to the edge of the air outlet grille, or the duct and the air outlet grille are integrally formed, and the rear end of the duct is either suspended or connected to the housing.

8. The dual-purpose cooling and heating fan according to claim 1, characterized in that: The duct is part of the inner wall of the air duct; or the outer wall of the duct has a connecting structure, and the duct is fixed to the air duct through the connecting structure.

9. The dual-purpose cooling and heating fan according to claim 1, characterized in that: The inner wall of the duct should be at least at an angle relative to the motor axis.

10. The dual-purpose cooling and heating fan according to claim 9, characterized in that: The inclined configuration is such that the diameter of the duct gradually increases from back to front, and the inclination angle is between 0.2° and 8°.

11. The dual-purpose cooling and heating fan according to claim 1, characterized in that: The air intake grille can be integrated with or separated from the air duct.

12. The dual-purpose cooling and heating fan according to claim 1, characterized in that: The duct extends forward along the motor axis to connect to the air outlet grille or forms a gap of less than 20mm with the air outlet grille.

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