Centrifugal warm air circulating fan

Abstract

The utility model discloses a centrifugal warm air circulating fan which comprises a fan assembly, the fan assembly comprises a centrifugal wind wheel, a fan sleeve shell and a wind wheel motor, the wind wheel motor drives the centrifugal wind wheel to rotate, and the centrifugal wind wheel is arranged in the fan sleeve shell. A reversing inner wall used for guiding radial airflow formed by operation of the centrifugal wind wheel into axial airflow is formed in the fan sleeve shell, the reversing inner wall is obliquely and forwards arranged, an air suction opening is formed in the rear end of the fan sleeve shell, an airflow heater is correspondingly arranged on the rear side of the air suction opening, and the fan assembly is provided with an annular air outlet. And the front end of the fan sleeve shell is communicated with the air outlet. The circulating fan not only has a good warm air effect, but also can maintain a strong indoor air stirring effect, so that the air supply performance of the circulating fan is relatively good.

Description

Technical Field

[0001] The utility model relates to the field of circulation fans, in particular to a centrifugal warm air circulation fan. Background Art

[0002] At present, circulation fans can blow air directly to the human body, and can also be used to stir the air in the room. Some circulation fans have a warm air function. The airflow generated by the circulation fan passes through the heating element, which heats the airflow and blows out warm air. However, the installation of the heating element will significantly increase the wind resistance. The existing circulation fans use axial flow impellers. Under the premise of small wind resistance, the axial flow impeller has the advantage of relatively large air volume. However, the wind pressure generated by the axial flow impeller is relatively low and the suction force is relatively small. When the heating element significantly increases the wind resistance, the airflow range of the circulation fan will be significantly shortened, and the stirring effect on the indoor air will be poor. In other words, the air supply performance of the existing circulation fans with warm air function is poor, so it is necessary to improve the above-mentioned circulation fans. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a centrifugal warm air circulation fan with relatively good air supply performance.

[0004] The purpose of this utility model is achieved through the following technical solutions.

[0005] The centrifugal warm air circulation fan disclosed by the present utility model includes a fan assembly, which includes a centrifugal fan wheel, a fan casing and a fan motor. The fan motor drives the centrifugal fan wheel to rotate. The centrifugal fan wheel is arranged in the fan casing. A reversing inner wall is formed in the fan casing for guiding the radial airflow formed by the operation of the centrifugal fan wheel into an axial airflow. The reversing inner wall is arranged obliquely forward. An air suction port is formed at the rear end of the fan casing. An air flow heater is correspondingly provided on the rear side of the air suction port. The fan assembly is provided with an air outlet, which is annular. The front end of the fan casing is connected to the air outlet.

[0006] Preferably, the centrifugal wind wheel includes blades, an air inlet ring and a guide plate. The air inlet ring is arranged on the rear side of the guide plate, and the blades are arranged between the air inlet ring and the guide plate. The air inlet ring is arranged to gradually shrink from front to back, and the air suction port is arranged as an inward-retracted port. The air inlet ring is arranged on the inner side of the air suction port, and the guide plate is arched backward.

[0007] Preferably, the circulation fan of the present invention also includes a motor mounting plate, which is recessed backward, the wind wheel motor is installed on the front side of the motor mounting plate, the motor mounting plate is arranged on the corresponding front side of the guide plate, and the air outlet is formed on the outer periphery of the motor mounting plate.

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

[0009] Preferably, the airflow heater includes a heating wire, a frame shell, and a support plate. The support plate is arranged in the frame shell, and the heating wire is wound around the support plate.

[0010] Preferably, the circulation fan of the present invention also includes a cylindrical shell, the fan assembly and the air flow heater are arranged in the cylindrical shell, the rear end of the cylindrical shell is provided with an air inlet, the air inlet is arranged directly behind the air flow heater, and the air inlet is provided with a filter.

[0011] Compared with the prior art, the present invention has the following beneficial effects: by arranging a centrifugal impeller in the fan casing, a reversing inner wall is formed in the fan casing for guiding the radial airflow formed by the operation of the centrifugal impeller into an axial airflow, the reversing inner wall is arranged obliquely forward, an air suction port is formed at the rear end of the fan casing, an air flow heater is provided at the rear side of the air suction port, the fan assembly is provided with an air outlet, the air outlet is annular, and the front end of the fan casing is connected to the air outlet, so that the air supply performance of the circulation fan of the present invention is relatively good. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the circulation fan of the present invention.

[0013] Figure 2 It is a schematic diagram of the cross-sectional structure of the circulation fan of the present invention when viewed from the left.

[0014] Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the circulation fan of the present invention.

[0015] Figure 4 This is a front exploded schematic diagram of the circulation fan of the present invention.

[0016] Figure 5 This is a schematic diagram of the backside explosion of the circulation fan of the present invention.

[0017] Figure 6 It is a schematic diagram of the three-dimensional structure of the centrifugal wind wheel of the present utility model.

[0018] Figure 7 This is a schematic cross-sectional structural diagram of the fan casing of the present invention.

[0019] Figure 8 This is a rear perspective structural diagram of the motor mounting plate of the present invention.

[0020] Figure 9 It is a schematic diagram of the three-dimensional structure of the airflow heater of the present utility model.

[0021] Explanation of reference numerals: fan assembly 1; centrifugal fan wheel 11; blades 111; air inlet ring 112; guide plate 113; fan casing 12; reversing inner wall 121; air suction port 122; fan motor 13; cylinder casing 2; base 3; air flow heater 4; heating wire 41; frame casing 42; support sheet 43; decorative cover 5; filter screen 6; rear ventilation hood 7; up and down swing motor 8; left and right swing motor 9; motor mounting plate 10; air outlet 100; air inlet 200. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] The centrifugal warm air circulation fan of the utility model is as follows Figures 1 to 5 As shown, the fan assembly 1 includes a centrifugal wind wheel 11, a fan casing 12 and a wind wheel motor 13. The wind wheel motor 13 drives the centrifugal wind wheel 11 to rotate. The wind wheel motor 13 is provided with an output shaft. The centrifugal wind wheel 11 can be coaxially mounted on the output shaft. Figure 2 As shown, the centrifugal wind wheel 11 is arranged in the fan casing 12, and the fan casing 12 and the centrifugal wind wheel 11 are arranged coaxially. Figure 2 Combine Figure 7 As shown, a reversing inner wall 121 is formed in the fan casing 12 for guiding the radial airflow generated by the operation of the centrifugal impeller 11 into an axial airflow. The reversing inner wall 121 is arranged obliquely forward. For example, when the reversing inner wall 121 is an inner conical surface, the generatrix of the inner conical surface is arranged obliquely forward, that is, the generatrix of the inner conical surface forms an acute angle with the rotation axis of the centrifugal impeller 11. Figure 7 In the embodiment shown, in order to smoothly turn the radial airflow into the axial airflow (roughly parallel to the rotation axis of the centrifugal impeller 11) for output, the angle between the reversing inner wall 121 and the rotation axis of the centrifugal impeller 11 can be set to gradually decrease from back to front, that is, the reversing inner wall 121 is a curved inner wall. Figure 2 and Figure 7 As shown, the rear end of the fan housing 12 is formed with an air suction port 122, and the rear side of the air suction port 122 is correspondingly provided with an air flow heater 4, as shown in FIG. Figure 1 As shown, the fan assembly 1 is provided with an air outlet 100, and the air outlet 100 is annular. Figure 1 and Figure 2 As shown, the front end of the fan casing 12 is connected to the air outlet 100. Since the centrifugal fan wheel 11 is arranged in the fan casing 12, and the air inlet 122 is formed at the rear end of the fan casing 12, in other words, the rear end of the centrifugal fan wheel 11 is the air inlet end.

[0024] The following briefly describes the working principle of the circulation fan of the utility model: Figure 2As shown, the wind wheel motor 13 drives the centrifugal wind wheel 11 to rotate, and the blades 111 of the centrifugal wind wheel 11 throw the air in the centrifugal wind wheel 11 outward (roughly along the rotation axis of the centrifugal wind wheel 11), so that the internal air pressure of the centrifugal wind wheel 11 is reduced, and then air is replenished into the centrifugal wind wheel 11 from the air intake port 122. Since the air flow heater 4 is arranged on the rear side of the air intake port 122, the air flow sucked into the air intake port 122 will first flow through the air flow heater 4, so that the air flow entering the inside of the centrifugal wind wheel 11 is heated, and the air flow thrown out by the centrifugal wind wheel 11 reaches the reversing inner wall 121. Through the guiding effect of the reversing inner wall 121, the air flow turns forward, and then the warm air flow is output forward through the annular air outlet 100. Compared with the axial-flow impeller, the centrifugal wind wheel 11 of the present invention has the advantages of relatively large suction force and relatively large output wind pressure. Specifically, the blades 111 are roughly parallel to the rotation axis of the centrifugal wind wheel 11, so that the blades 111 push the air toward the inner wall of the fan casing 12 with greater strength, so that the wind can have a greater air pressure. The fan blades of the axial-flow impeller tend to be more perpendicular to the rotation axis, and the pushing strength of the above-mentioned fan blades on the air is lower. If the above-mentioned fan blades are completely perpendicular to the rotation axis, then the above-mentioned fan blades have almost no pushing effect on the air. By providing an annular air outlet 100, the cross-sectional area of ​​the air outlet 100 of the circulation fan can be reduced (compared to existing products), which is beneficial for increasing the air velocity. Furthermore, since the centrifugal impeller 11 has the advantage of relatively high output air pressure, the air velocity is not significantly affected by the reduced cross-sectional area of ​​the air outlet 100. In other words, although the air flow rate of the centrifugal warm air circulation fan of the present invention is relatively reduced, the air velocity is roughly equivalent to that of commercially available circulation fans without a warm air function, and the indoor air is still effectively stirred. Since the centrifugal impeller 11 of the present invention has a relatively large suction force during operation, the increased suction force at the air intake 122 can offset (or significantly reduce) the airflow obstruction of the airflow heater 4, thereby enabling the circulation fan of the present invention to achieve both a good warming effect and a strong indoor air stirring effect. Therefore, the air supply performance of the circulation fan of the present invention is relatively good.

[0025] Furthermore, if Figure 6 As shown, the centrifugal impeller 11 includes blades 111, an air inlet ring 112 and a guide plate 113. The air inlet ring 112 is arranged at the rear side of the guide plate 113, and the blades 111 are arranged between the air inlet ring 112 and the guide plate 113. The air inlet ring 112 is gradually reduced from the front to the back. Figure 7 As shown, the air inlet 122 is configured as an inner constriction. In other words, the inner diameter of the air inlet 122 is smaller than the inner diameter of the front end of the fan housing 12, so that the air inlet 122 is in a constriction shape. Figure 2As shown, the air inlet ring 112 is arranged on the inner side of the air suction port 122. To prevent the air inlet ring 112 from scratching the inner wall of the air suction port 122, a gap of 1 mm to 4 mm is left between the air inlet ring 112 and the air suction port 122; Figures 2 to 6 As shown, the guide plate 113 is arched backwards. In other words, the guide plate 113 (on the radial section of the centrifugal wind wheel 11) is arc-shaped. The guide plate 113 is coaxially arranged with the centrifugal wind wheel 11. Figure 2 As shown, since the air inlet ring 112 is gradually narrowed from the front to the rear, the air flow sucked into the centrifugal impeller 11 will be guided by the air inlet ring 112 and flow obliquely forward, making the air flow turn smoothly. The cross section of the air inlet ring 112 can be an inwardly concave arc. Since the guide plate 113 is arched backward, when the air flow inside the centrifugal impeller 11 flows from the middle of the guide plate 113 to the edge of the guide plate 113, it will be guided by the guide plate 113 and tend to flow forward, making the air flow reversal tend to be smooth (as shown in FIG. Figure 2 ), which helps to reduce wind resistance.

[0026] Furthermore, if Figures 2 to 4 As shown, the circulation fan of the present invention also includes a motor mounting plate 10, which is recessed backward (viewed from front to back), and a wind wheel motor 13 is mounted on the front side of the motor mounting plate 10. The motor mounting plate 10 is arranged on the corresponding front side of the guide plate 113. The housing assembly of the wind wheel motor 13 is specifically mounted on the bottom (rear end) of the motor mounting plate 10 by screws, and the output shaft of the wind wheel motor 13 passes through the motor mounting plate 10 backward. Figure 8 As shown, the air outlet 100 is formed on the outer periphery of the motor mounting plate 10. More specifically, a mounting ring is provided on the outer side of the motor mounting plate 10. Figure 2 As shown, the rear end of the mounting ring is coaxially aligned with the front end of the fan casing 12 and plugged in. The mounting ring is adapted to be arranged in the front end of the cylinder casing 2, as shown in FIG. Figure 8 As shown, the air outlet 100 is specifically formed between the motor mounting plate 10 body and the aforementioned mounting ring. The motor mounting plate 10 body and the aforementioned mounting ring are connected as a whole via circumferentially distributed support plates. By arranging the wind wheel motor 13 to be mounted on the front side of the motor mounting plate 10 and the motor mounting plate 10 to be recessed rearward, the main body of the wind wheel motor 13 can be hidden within the motor mounting plate 10, which facilitates a compact structure of the circulation fan. Since the guide plate 113 is provided and the air outlet 100 is located radially outward of the guide plate 113, the wind wheel motor 13 does not affect the airflow of the circulation fan.

[0027] Furthermore, if Figures 1 to 5As shown, the front cover of the motor mounting plate 10 is provided with a decorative cover 5, and the impeller motor 13 is provided on the rear side of the decorative cover 5. This prevents the user from seeing the impeller motor 13, improves the appearance of the circulation fan, and prevents dust and debris from easily adhering to the impeller motor 13. The edges of the decorative cover 5 are formed with buckles, which buckle to the motor mounting plate 10.

[0028] Furthermore, if Figure 9 As shown, the airflow heater 4 includes a heating wire 41, a frame 42 and a support sheet 43. The support sheet 43 is arranged in the frame 42, and the heating wire 41 is wound around the support sheet 43. Figure 2 and Figure 5 As shown, the frame 42 can be installed to the rear end of the fan housing 12 by screws. For example, the left and right ends of the support sheet 43 are respectively inserted into the inner wall of the frame 42. The support sheet 43 can be made of insulating material (for example, mica sheet). The airflow can pass through the gap between the heating wires 41 and the heating wires 41. By setting a structure in which the heating wires 41 are wound around the support sheet 43, it is beneficial to increase the heat exchange area between the airflow and the airflow heater 4, which is beneficial to improve the efficiency of heating the airflow. If the airflow heater 4 adopts the structure of a PTC heating element, it is necessary to set the fins against the PTC heating element. In fact, the fins are in contact with the air, so the PTC heating element and the airflow are indirectly heat exchanged, and the heat exchange efficiency is relatively low.

[0029] Furthermore, if Figures 1 to 5 As shown, it also includes a cylinder shell 2, a fan assembly 1 and an air flow heater 4 are arranged in the cylinder shell 2, and an air inlet 200 is provided at the rear end of the cylinder shell 2. The air inlet 200 is arranged directly behind the air flow heater 4, and the air inlet 200 is provided with a filter 6 (it should be noted that Figure 3 The mesh structure of the filter 6 is not shown); by setting the shell 2, the circulation fan has a simple external structure and is convenient for cleaning the circulation fan; by setting the filter 6, such as Figure 2 As shown, the airflow generated by the circulating fan when it is working is filtered by the filter 6 when it enters the air inlet 200, preventing large debris from entering the airflow heater 4 and causing the airflow heater 4 to be blocked. Since the fan assembly 1 can generate a large wind pressure, the obstruction of the filter 6 to the airflow can be reduced. Figure 2 and Figure 4 As shown, the air inlet 200 is also fastened with a rear ventilation cover 7, which is arranged on the rear side of the filter 6. The rear ventilation cover 7 is provided with a grid, and the rear ventilation cover 7 is used to protect the filter 6 and prevent the filter 6 from being directly impacted.

[0030] like Figure 1 and Figure 5As shown, the circulation fan of the present invention also includes a base 3, which includes a movable base and a fixed base. A fork arm is provided on the movable base, and the cylinder shell 2 and the fan casing 12 are swingably connected to the fork arm. The cylinder shell 2 and the fan casing 12 are coaxially swingingly arranged, as shown in FIG. Figure 5 As shown, the outer side of the fan casing 12 is equipped with an up-and-down swing motor 8, which drives the cylinder casing 2 to swing back and forth relative to the movable seat through the corresponding crank rocker mechanism; Figure 2 As shown, a left and right swinging motor 9 is provided in the base 3, and the left and right swinging motor 9 drives the movable seat to swing back and forth relative to the fixed seat through the corresponding crank rocker mechanism; the above-mentioned reciprocating swinging air supply structure principle belongs to the existing technology and is not the focus of the present utility model, so it will not be described in detail.

Claims

1. A centrifugal warm air circulation fan, characterized in that: The invention comprises a fan assembly (1), wherein the fan assembly (1) comprises a centrifugal fan wheel (11), a fan casing (12) and a fan motor (13), wherein the fan motor (13) drives the centrifugal fan wheel (11) to rotate, and the centrifugal fan wheel (11) is arranged in the fan casing (12). A reversing inner wall (121) is formed in the fan casing (12) for guiding the radial airflow formed by the operation of the centrifugal fan wheel (11) into an axial airflow, and the reversing inner wall (121) is arranged obliquely forward. An air suction port (122) is formed at the rear end of the fan casing (12), and an air flow heater (4) is correspondingly provided at the rear side of the air suction port (122). The fan assembly (1) is provided with an air outlet (100), and the air outlet (100) is annular. The front end of the fan casing (12) is connected to the air outlet (100).

2. The centrifugal warm air circulation fan according to claim 1, characterized in that: The centrifugal impeller (11) comprises blades (111), an air inlet ring (112) and a guide plate (113); the air inlet ring (112) is arranged at the rear side of the guide plate (113); the blades (111) are arranged between the air inlet ring (112) and the guide plate (113); the air inlet ring (112) is arranged to gradually shrink from front to back; the air suction port (122) is arranged as an inwardly contracted port; the air inlet ring (112) is arranged at the inner side of the air suction port (122); and the guide plate (113) is in a backward arched shape.

3. The centrifugal warm air circulation fan according to claim 2, characterized in that: The motor mounting plate (10) is further comprised, wherein the motor mounting plate (10) is arranged to be recessed rearward, the wind wheel motor (13) is mounted on the front side of the motor mounting plate (10), the motor mounting plate (10) is arranged on the corresponding front side of the guide plate (113), and the air outlet (100) is formed on the outer periphery of the motor mounting plate (10).

4. The centrifugal warm air circulation fan according to claim 3, characterized in that: The front side cover of the motor mounting plate (10) is provided with a decorative cover (5), and the wind wheel motor (13) is provided on the rear side of the decorative cover (5).

5. The centrifugal warm air circulation fan according to any one of claims 1 to 4, characterized in that: The airflow heater (4) comprises a heating wire (41), a frame shell (42) and a support plate (43); the support plate (43) is arranged in the frame shell (42), and the heating wire (41) is wound around the support plate (43).

6. The centrifugal warm air circulation fan according to claim 5, characterized in that: It also includes a cylindrical shell (2), wherein the fan assembly (1) and the air flow heater (4) are arranged in the cylindrical shell (2), and an air inlet (200) is provided at the rear end of the cylindrical shell (2), and the air inlet (200) is arranged directly behind the air flow heater (4), and the air inlet (200) is provided with a filter (6).

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