Centrifugal hot air circulation fan

Abstract

To provide a centrifugal type warm air circulation fan having a good warm air effect, capable of maintaining a strong agitating effect on indoor air, and having a relatively excellent air blowing performance. [Solution] The centrifugal hot air circulation fan includes a blower assembly, the blower assembly having a centrifugal wind wheel 11, a blower housing 12 and a wind wheel motor 13, the wind wheel motor drives and rotates the centrifugal wind wheel, the centrifugal wind wheel is provided within the blower housing, a turning inner wall is formed within the blower housing to guide the radial airflow generated by the operation of the centrifugal wind wheel into an axial airflow, the turning inner wall is provided diagonally forward, an air intake is formed at the rear end of the blower housing, an air flow heater is provided correspondingly to the rear side of the air intake, the blower assembly is provided with an air intake 100, the air intake is annular, and the front end of the blower housing is connected to the air intake.

Description

[Technical field]

[0001] The present invention relates to the field of circulation fans, specifically to centrifugal hot air circulation fans. [Background technology]

[0002] At present, circulation fans can blow air directly onto the human body, and can also be used to stir indoor air. Some circulation fans have a hot air function, and the airflow generated by the circulation fan passes through a heating element, and the airflow is heated by the heating element, so that the hot air can be blown out. However, the heating element is arranged, so that the wind resistance is significantly increased. In contrast, the conventional circulation fans adopt an axial impeller, and under the premise of small wind resistance, the axial impeller has the advantage of a relatively large air volume, but the wind pressure generated by the axial impeller is relatively low and the suction force is relatively small. Therefore, when the wind resistance is significantly increased by the heating element, the range of the circulation fan's blowing airflow is significantly shortened, and the stirring effect on the indoor air is poor, which means that the blowing performance of the conventional circulation fans with hot air function is poor, so that the above circulation fans need to be improved. Summary of the Invention

[0003] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to overcome the shortcomings of the prior art and provide a centrifugal type hot air circulation fan having relatively excellent blowing performance.

[0004] The object of this utility model is achieved by the following technical solutions:

[0005] The centrifugal hot air circulation fan disclosed in this utility model includes a blower assembly, the blower assembly including a centrifugal wind wheel, a blower housing, and a wind wheel motor, the wind wheel motor drives and rotates the centrifugal wind wheel, the centrifugal wind wheel is provided within the blower housing, a turning inner wall is formed within the blower housing to guide the radial airflow generated by the operation of the centrifugal wind wheel into an axial airflow, the turning inner wall is provided diagonally forward, an air intake port is formed at a rear end of the blower housing, an air flow heater is provided correspondingly to the rear side of the air intake port, the blower assembly is provided with an air outlet, the air outlet is annular, and the front end of the blower housing is connected to the air outlet.

[0006] Preferably, the centrifugal wind turbine comprises blades, an air intake wheel and a flow guide plate, the air intake wheel is provided on the rear side of the flow guide plate, the blades are provided between the air intake wheel and the flow guide plate, the air intake wheel is gradually smaller from front to rear, the air intake port is provided as an inwardly narrowing port, the air intake wheel is provided inside the air intake port, and the flow guide plate is formed in an arch shape toward the rear.

[0007] Preferably, the centrifugal hot air circulation fan of the present utility model further comprises a motor mounting plate recessed rearward, the windmill motor is attached to the front side of the motor mounting plate, the motor mounting plate is provided on the corresponding front side of the air guide plate, and the air outlet is formed on the outer periphery of the motor mounting plate.

[0008] Preferably, a decorative cover is provided on the front side of the motor mounting plate, and the windmill motor is provided on the rear side of the decorative cover.

[0009] Preferably, the airflow heater includes an electric heating wire, a frame case, and a support sheet provided within the frame case, and the electric heating wire is wound around the support sheet.

[0010] Preferably, the centrifugal hot air circulation fan of the present invention further comprises a sleeve in which the blower assembly and the airflow heater are disposed, the sleeve has an inlet at a rear end thereof, the inlet is disposed directly behind the airflow heater, and the inlet is provided with a filter screen.

[0011] Compared with the prior art, the present utility model has the following beneficial effects:

[0012] A centrifugal wind turbine is disposed within a blower housing, and a turning inner wall is formed within the blower housing to guide the radial airflow caused by the operation of the centrifugal wind turbine into an axial airflow, the turning inner wall is arranged diagonally forward, an air intake is formed at the rear end of the blower housing, a corresponding airflow heater is arranged behind the air intake, the blower assembly is provided with an air outlet, the air outlet is annular, and the front end of the blower housing is connected to the air outlet, thereby making the circulation fan of this utility model relatively excellent in blowing performance. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a schematic perspective view of the circulation fan of the present invention; [Diagram 2] FIG. 2 is a schematic diagram of a cross-sectional structure of the circulation fan of the present invention as viewed from the left side. [Diagram 3] FIG. 2 is a schematic perspective sectional view of the circulation fan of the present invention; [Figure 4] FIG. 2 is a front exploded schematic view of the circulation fan of the present invention. [Diagram 5] FIG. 2 is a schematic exploded rear view of the circulation fan of the present invention. [Figure 6] FIG. 1 is a schematic perspective view of the centrifugal wind turbine of the present invention. [Figure 7] FIG. 2 is a schematic cross-sectional view of the blower housing of the present invention. [Figure 8] FIG. 2 is a rear perspective view showing the schematic structure of the motor mounting plate of the present utility model. [Figure 9] FIG. 2 is a schematic perspective view of the airflow heater of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present utility model will be further described below with reference to the drawings.

[0015] As shown in Figures 1 to 5, the centrifugal hot air circulation fan of the present invention includes a blower assembly 1, which includes a centrifugal wind wheel 11, a blower housing 12, and a wind wheel motor 13, which drives and rotates the centrifugal wind wheel 11, which is provided with an output rotating shaft, and which can be coaxially attached to the output rotating shaft. As shown in Figure 2, the centrifugal wind wheel 11 is provided in the blower housing 12, which is coaxially attached to the centrifugal wind wheel 11. 1 and 7, a turning inner wall 121 for guiding the radial airflow caused by the operation of the centrifugal wind turbine 11 into an axial airflow is formed in the blower housing 12, and the turning inner wall 121 is provided diagonally forward. For example, when the turning inner wall 121 is an inner cone surface, the generatrix of the inner cone surface is provided diagonally forward, that is, the generatrix of the inner cone surface and the rotation axis of the centrifugal wind turbine 11 form an acute angle. In the embodiment shown in FIG. 7, in order to gently turn the radial airflow into an axial airflow (approximately parallel to the rotation axis of the centrifugal wind turbine 11), the angle between the turning inner wall 121 and the rotation axis of the centrifugal wind turbine 11 may be provided so as to gradually decrease from the rear to the front, that is, the turning inner wall 121 is a curved inner wall. As shown in Figures 2 and 7, an air intake 122 is formed at the rear end of the blower housing 12, and an airflow heater 4 is provided behind the air intake 122, and as shown in Figure 1, the blower assembly 1 is provided with an air intake 100, which is annular, and as shown in Figures 1 and 2, the front end of the blower housing 12 communicates with the air intake 100. The centrifugal wind wheel 11 is provided in the blower housing 12, and the air intake 122 is formed at the rear end of the blower housing 12, so that the rear end of the centrifugal wind wheel 11 may be said to be an air intake port.

[0016] The operation principle of the circulation fan of the present invention will be briefly described below. As shown in Fig. 2, the windmill motor 13 drives the centrifugal windmill 11 to rotate, and the blades 111 of the centrifugal windmill 11 blow out the air inside the centrifugal windmill 11 (almost perpendicular to the rotation axis of the centrifugal windmill 11), lowering the air pressure inside the centrifugal windmill 11, so that the air is replenished inside the centrifugal windmill 11 through the air intake 122. Since the airflow heater 4 is installed behind the air intake 122, the airflow sucked into the air intake 122 flows to pass through the airflow heater 4 first, thereby heating the airflow entering the inside of the centrifugal windmill 11, and the airflow blown out by the centrifugal windmill 11 reaches the turning inner wall 121, where the airflow is bent forward by the guiding action of the turning inner wall 121, and the heated airflow is then output forward through the annular air outlet 100. Compared to an axial-flow impeller, the centrifugal wind turbine 11 of this utility model has the advantage of a relatively large suction force and a relatively large output wind pressure. Specifically, the blades 111 are nearly parallel to the rotation axis of the centrifugal wind turbine 11, and by increasing the strength of the blades 111 to press the air against the inner wall of the blower housing 12, the blown air can have a large air pressure. In contrast, the blades of an axial-flow impeller tend to be perpendicular to the rotation axis, and the blades have a low pressing force against the air. If the blades are completely perpendicular to the rotation axis, the blades have almost no pressing force against the air. By providing an annular air outlet 100, the cross-sectional area of ​​the air outlet 100 of the circulation fan can be made smaller (compared to conventional products), which is advantageous in increasing the wind speed of the air. At the same time, since the centrifugal wind mill 11 has the advantage of having a relatively large output wind pressure, it is possible to avoid a significant impact on the air speed due to the smaller cross-sectional area of ​​the air outlet 100. In other words, although the air volume of the centrifugal hot air circulation fan of this utility model is relatively reduced, the air speed is almost the same as that of commercially available circulation fan products that do not have a hot air function, so it can still have a good mixing effect on the indoor air.Since the centrifugal wind turbine 11 of this utility model has a relatively large suction force during operation, the increased suction force at the air intake 122 can offset (or significantly reduce) the obstruction effect on the airflow of the airflow heater 4. As a result, the circulation fan of this utility model has a good warm air effect and can maintain a strong stirring effect on the indoor air, so it can be said that the blowing performance of the circulation fan of this utility model is relatively excellent.

[0017] 6, the centrifugal wind turbine 11 includes blades 111, an air intake wheel 112, and a flow guide plate 113. The air intake wheel 112 is provided on the rear side of the flow guide plate 113. The blades 111 are provided between the air intake wheel 112 and the flow guide plate 113. The air intake wheel 112 is gradually smaller from the front to the rear. As shown in FIG. 7, the air intake port 122 is provided as an inwardly contracting port. In other words, the inner diameter of the air intake port 122 is smaller than the inner diameter of the front end of the blower housing 12, making the air intake port 122 contract. As shown in FIG. 2, the air intake wheel 112 is provided inside the air intake port 122. A gap of 1 to 4 mm is left between the air intake wheel 112 and the air intake port 122 so that the air intake wheel 112 does not hit the inner wall of the air intake port 122. As shown in Fig. 2 to Fig. 6, the guide plate 113 is formed in an arch shape toward the rear, in other words, the guide plate 113 (in the radial cross section of the centrifugal wind turbine 11) is in an arc shape, and the guide plate 113 is attached coaxially to the centrifugal wind turbine 11. As shown in Fig. 2, the wind intake wheel 112 is provided so as to become gradually smaller from the front to the rear, so that the airflow sucked into the inside of the centrifugal wind turbine 11 is guided by the wind intake wheel 112 and flows diagonally forward, gently redirecting the airflow, and the cross section of the wind intake wheel 112 may be an inwardly concave arc shape, and the guide plate 113 is arched toward the rear, so that when the airflow inside the centrifugal wind turbine 11 flows from the middle part of the guide plate 113 to the edge of the guide plate 113, it is guided by the guide plate 113 and tends to be biased forward, gently redirecting the airflow (as shown by the dashed arrow in Fig. 2), which is advantageous for reducing wind resistance.

[0018] 2 to 4, the circulation fan of the present invention further includes a motor mounting plate 10 that is recessed backward (when viewed from front to back), the windmill motor 13 is mounted on the front side of the motor mounting plate 10, the motor mounting plate 10 is mounted on the corresponding front side of the air guide plate 113, the housing of the windmill motor 13 is mounted on the bottom (rear end) of the motor mounting plate 10 by screws, the output rotating shaft of the windmill motor 13 passes through the motor mounting plate 10 backward, and the blowing port 100 is formed on the outer periphery of the motor mounting plate 10 as shown in FIG. 8. More specifically, a mounting ring is provided on the outside of the motor mounting plate 10, and the rear end of the mounting ring is inserted and aligned coaxially with the front end of the blower housing 12 as shown in FIG. 2, and the mounting ring is arranged to fit into the front end of the sleeve 2. As shown in Fig. 8, the air outlet 100 is specifically formed between the body of the motor mounting plate 10 and the mounting ring, and the body of the motor mounting plate 10 and the mounting ring are integrally connected via support sheets distributed in the circumferential direction. The windmill motor 13 is mounted on the front side of the motor mounting plate 10, and the motor mounting plate 10 is recessed backward, so that the body of the windmill motor 13 can be hidden inside the motor mounting plate 10, which is advantageous for making the structure of the circulation fan compact. Since the air guide plate 113 is provided and the air outlet 100 is located radially outside the air guide plate 113, the windmill motor 13 does not affect the airflow of the circulation fan.

[0019] 1 to 5, the front side of the motor mounting plate 10 is covered with the decorative cover 5, and the windmill motor 13 is provided behind the decorative cover 5, which prevents the user from seeing the windmill motor 13, which is advantageous for improving the appearance of the circulation fan and also prevents dust and dirt from easily attaching to the windmill motor 13. The decorative cover 5 has an ear hook formed on its edge for engaging with the motor mounting plate 10.

[0020] Furthermore, as shown in FIG. 9, the airflow heater 4 includes an electric heating wire 41, a frame case 42, and a support sheet 43 provided in the frame case 42, and the electric heating wire 41 is wound around the support sheet 43. As shown in FIG. 2 and FIG. 5, the frame case 42 may be attached to the outside of the rear end of the blower housing 12 by screws. For example, the left and right ends of the support sheet 43 are inserted into the inner wall of the frame case 42, respectively, and the support sheet 43 can be made of an insulating material (e.g., a mica sheet), and the airflow can pass through the gap between the electric heating wires 41. The electric heating wire 41 is configured to be wound around the support sheet 43, which is advantageous in increasing the heat exchange area between the airflow and the airflow heater 4 and improving the heating efficiency of the airflow. When the airflow heater 4 adopts the structure of a PTC heating element, it is necessary to attach a fan to the PTC heating element, and since it is actually in contact with the air using fins, the PTC heating element and the airflow indirectly exchange heat, and the heat exchange efficiency is relatively low.

[0021] 1 to 5, the fan further includes a sleeve 2 in which the blower assembly 1 and the airflow heater 4 are provided, and the sleeve 2 has an inlet 200 at its rear end, which is provided directly behind the airflow heater 4, and a filter screen 6 (note that the mesh structure of the filter screen 6 is not shown in FIG. 3) at the inlet 200. By providing the sleeve 2, the external structure of the circulation fan is simplified, and the circulation fan is easy to clean. By providing the filter screen 6, as shown in FIG. 2, the filter screen 6 acts when the airflow generated when the circulation fan is operating is allowed to enter the inlet 200, and it is possible to prevent large-volume dust from entering the airflow heater 4 and blocking the airflow heater 4. Since the blower assembly 1 can generate a relatively large wind pressure, the filter screen 6 can reduce the airflow obstruction. As shown in Figures 2 and 4, a rear ventilation cover 7 is further engaged and attached to the entrance 200, and the rear ventilation cover 7 having a grid is provided on the rear side of the filter screen 6 to prevent the filter screen 6 from being directly hit, and is used to protect the filter screen 6.

[0022] As shown in Fig. 1 and Fig. 5, the circulation fan of the present invention further includes a base 3, the base 3 includes a movable base and a fixed base, the movable base is provided with a fork arm, the fork arm is connected to the sleeve 2 and the blower housing 12 so as to be able to swing, and the sleeve 2 and the blower housing 12 are installed so as to be able to swing coaxially. As shown in Fig. 5, a vertical swing motor 8 is attached to the outside of the blower housing 12, and the vertical swing motor 8 swings the sleeve 2 up and down reciprocatingly relative to the movable base through a corresponding crank rocker mechanism. As shown in Fig. 2, a left-right swing motor 9 is provided in the base 3, and the left-right swing motor 9 swings the movable base reciprocatingly left and right relative to the fixed base through a corresponding crank rocker mechanism. The principle of the above-mentioned blowing structure by reciprocating swing belongs to the prior art and is not the focus of the present invention, so it will not be described in detail. [Explanation of symbols]

[0023] 1...blower assembly, 11...centrifugal wind turbine, 111...blade, 112...intake wheel, 113...flow guide plate, 12...blower housing, 121...inner deflection wall, 122...intake port, 13...wind turbine motor, 2...sleeve, 3...base, 4...airflow heater, 41...heating wire, 42...frame case, 43...support sheet, 5...decorative cover, 6...filter screen, 7...rear ventilation cover, 8...up-down swing motor, 9...left-right swing motor, 10...motor mounting plate, 100...blower port, 200...entrance.

Claims

1. The present invention includes a blower assembly (1), the blower assembly (1) including a centrifugal wind wheel (11), a blower housing (12) and a wind wheel motor (13), the wind wheel motor (13) drives and rotates the centrifugal wind wheel (11), the centrifugal wind wheel (11) is provided within the blower housing (12), and the blower housing (12) includes a rotor (14) for guiding a radial airflow generated by the operation of the centrifugal wind wheel (11) into an axial airflow. a turning inner wall (121) is formed, the turning inner wall (121) is provided diagonally forward, an air intake port (122) is formed at the rear end of the blower housing (12), an air flow heater (4) is provided correspondingly at the rear side of the air intake port (122), the blower assembly (1) is provided with an air outlet (100), the air outlet (100) is annular, and the front end of the blower housing (12) is connected to the air outlet (100). A centrifugal hot air circulation fan characterized by:

2. The centrifugal wind turbine (11) includes a blade (111), a wind intake wheel (112), and a flow guide plate (113). The air intake wheel (112) is provided on the rear side of the flow guide plate (113), The blades (111) are provided between the air intake wheel (112) and the flow guide plate (113), The air intake ring (112) is provided so as to become gradually smaller from the front to the rear, The air intake (122) is provided as an inwardly contracted opening, and the air intake ring (112) is provided inside the air intake (122); The flow guide plate (113) is formed in an arch shape toward the rear.

2. The centrifugal hot air circulation fan according to claim 1,

3. The motor mounting plate (10) is recessed backward. The wind turbine motor (13) is attached to the front side of the motor mounting plate (10), the motor mounting plate (10) is provided on the corresponding front side of the air guide plate (113), and the air outlet (100) is formed on the outer periphery of the motor mounting plate (10).

3. The centrifugal hot air circulation fan according to claim 2,

4. A decorative cover (5) is provided on the front side of the motor mounting plate (10), and the windmill motor (13) is provided on the rear side of the decorative cover (5).

4. The centrifugal hot air circulation fan according to claim 3,

5. The airflow heater (4) includes a heating wire (41), a frame case (42), and a support sheet (43) provided in the frame case (42), and the heating wire (41) is wound around the support sheet (43).

5. The centrifugal hot air circulation fan according to claim 1, wherein the first and second axial lengths of the first and second axial lengths are equal to or larger than the first and second axial lengths of the first and second axial lengths.

6. The device further comprises a sleeve (2) in which the blower assembly (1) and the airflow heater (4) are disposed, the sleeve (2) having an inlet (200) at a rear end thereof, the inlet (200) being disposed immediately behind the airflow heater (4), the inlet (200) being provided with a filter screen (6).

6. The centrifugal hot air circulation fan according to claim 5,

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