Bidirectional multi-blade impeller, ventilation and heating integrated fan and bath heater

Abstract

According to the technical scheme, the bidirectional multi-wing impeller comprises a wheel disc with two faces, first blades and second blades are vertically arranged on the first face and the second face of the wheel disc respectively, the first blades and the second blades are distributed at equal intervals in a radial mode, and the first blades and the second blades are distributed in an arc chord line and staggered mode along the upper edge and the lower edge of the section; (2) a ventilation and heating integrated fan based on the impeller is bidirectionally driven by a direct-current brushless motor, and forward and reverse air outlets and side air inlets are formed in the circumferential direction of a volute; and (3) the fan is vertically arranged and is assembled in the bath heater to realize double functions of ventilation and heating. The impeller and the fan effectively balance the forward and reverse rotation aerodynamic performance, the forward and reverse rotation air volume difference is smaller than or equal to 15%, and the reverse rotation air speed reaches 85% or above of forward rotation; when the double-fan system is applied to the bath heater, high-efficiency heating, ventilation and compact space adaptation are realized by matching with integrated control of a single-chip microcomputer, and the defects of high noise and space redundancy of a traditional double-fan system are overcome.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, specifically to a bidirectional multi-blade impeller, an integrated ventilation and heating fan, and a bathroom heater. Background Technology

[0002] In existing bathroom heater ceiling appliances, a common solution is to use two independent AC motors driving two multi-bladed centrifugal fans, which respectively achieve the functions of heating and ventilation. The heating and ventilation fans are equipped with warm air ducts and are linked to the PTC heater; the ventilation fans are equipped with ventilation ducts and are connected to the outdoor exhaust duct. The dual-fan system requires an independent duct structure and installation space, resulting in an increase in the overall thickness of the bathroom heater and requiring more space.

[0003] Some new products have attempted to use bidirectional multi-blade centrifugal fans to replace dual fans, but significant differences in their forward and reverse aerodynamic performance have been found. Actual test data shows that the reverse air volume / velocity of a conventional bidirectional multi-blade centrifugal fan is only 30% of that in forward rotation, making it difficult to meet performance requirements. Moreover, flow separation occurs within the flow channel during reverse operation, leading to increased noise levels and even the risk of pipe resonance.

[0004] Therefore, there is an urgent need to develop an integrated ventilation and heating fan that can achieve bidirectional high-performance output under a single motor drive, so as to simultaneously meet space constraints and energy efficiency requirements. Utility Model Content

[0005] In order to overcome the above-mentioned defects of existing products, this utility model provides a bidirectional multi-blade impeller, a ventilation and heating integrated fan and a bathroom heater.

[0006] The technical solution adopted by this utility model is as follows: a bidirectional multi-blade impeller, comprising: a disc having a first surface and a second surface; a plurality of first blades, perpendicular to the first surface of the disc, extending outward from the center to the edge, and arranged radially at equal intervals; a plurality of second blades, perpendicular to the second surface of the disc, extending outward from the center to the edge, and arranged radially at equal intervals; the upper and lower edge chords of the first blades and the second blades along the cross-section perpendicular to their width direction are arcs; the first blades and the second blades are staggered.

[0007] Preferably, the width of the first blade is greater than the width of the second blade, and the outer edges of all the first blades are connected by a retaining ring.

[0008] Preferably, the blade inlet installation angle of the first blade and the second blade is greater than the blade outlet installation angle.

[0009] Preferably, the center of the wheel is provided with a motor mounting cavity, and the wheel is provided with a plurality of flow guiding channels, the direction of rotation of the flow guiding channels being opposite to the bending direction of the first blade.

[0010] The second technical solution adopted by this utility model is as follows: an integrated ventilation and heating fan, comprising: the impeller; a volute, the circumferential wall of which is provided with a forward air outlet and a reverse air outlet along the forward and reverse rotation directions of the impeller, and the side wall of the volute is provided with a side air inlet; a motor, which is a DC brushless motor with a rotating outer shell, driving the impeller to rotate; and a motor cover, which is installed on the side wall of the volute, forming an installation space for the motor between the motor cover and the volute.

[0011] The third technical solution adopted by this utility model is as follows: A bathroom heater includes: a panel and a shell, which are combined into one piece; the panel is provided with a hot air inlet and a return air inlet; the shell is provided with an exhaust air inlet; a plurality of heating lamps and a plurality of lighting lamps are arranged on the panel; a ventilation and heating integrated fan is installed in the cavity formed by the panel and the shell; the forward air outlet is connected to the hot air inlet; the reverse air outlet is connected to the exhaust air inlet; and the side air inlet is connected to the return air inlet; and a PTC heating module is arranged between the forward air outlet and the hot air inlet.

[0012] Preferably, the integrated fan for heating and ventilation is arranged vertically, and the impeller is horizontally positioned relative to the central axis of the motor.

[0013] Preferably, the heating lamps are arranged in four groups in a matrix; the lighting lamps are arranged in two or four groups in the gaps between two adjacent groups of heating lamps.

[0014] Preferably, the volute is equipped with a hot air shroud with openings at the top and bottom, the upper opening being connected to the forward air outlet and the lower opening being connected to the hot air inlet, and the PTC heating module is fixed in the hot air shroud.

[0015] Preferably, the driving circuits of the motor, the heating lamp, the lighting lamp, and the PTC heating module are integrated and controlled by a microcontroller.

[0016] This utility model has the following beneficial effects:

[0017] 1. High performance in both directions: Through the staggered distribution of the first and second blades and the arc-shaped cross-section design, the difference in air volume between forward and reverse rotation is ≤15%, and the reverse rotation wind speed reaches more than 85% of the forward rotation speed, which solves the problem of performance imbalance in traditional bidirectional fans;

[0018] 2. Aerodynamic optimization: The variable cross-section design of the blade with an inlet angle greater than the outlet angle, combined with the reverse swirling structure of the guide channel, reduces flow separation, lowers noise levels, and eliminates the risk of pipe resonance;

[0019] 3. Integrated structure: The DC brushless motor, combined with the bidirectional multi-blade impeller, replaces the dual-fan system, simplifying the design and reducing costs;

[0020] 4. Improved hot air efficiency: The PTC heating module is integrated into the hot air hood, shortening the hot air direct blowing path and improving the heating rate;

[0021] 5. Space compatibility: The single fan system adopts a vertically arranged impeller and a horizontal central shaft design, which reduces the overall size of the bathroom heater and saves space compared with traditional models, making it suitable for installation in compact spaces. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the impeller in Embodiment 1 of this utility model.

[0023] Figure 2 This is a front view schematic diagram of the impeller in Embodiment 1 of this utility model.

[0024] Figure 3 This is a detailed schematic diagram of the first blade of the impeller in Embodiment 1 of this utility model.

[0025] Figure 4 This is an exploded schematic diagram of the fan in Embodiment 1 of this utility model (motor not shown).

[0026] Figure 5 This is a three-dimensional schematic diagram of a bathroom heater according to Embodiment 1 of this utility model.

[0027] Figure 6 This is an explosion diagram of a bathroom heater according to Embodiment 1 of this utility model.

[0028] Figure 7 This is a three-dimensional schematic diagram of the second embodiment of the present invention, a bathroom heater.

[0029] Impeller 1, impeller disk 1.1, first blade 1.2, second blade 1.3, fixing ring 1.4, mounting cavity 1.5, flow guide channel 1.6;

[0030] 2. Volute, 2.1. Front air outlet, 2.2. Reverse air outlet, 2.3.

[0031] Motor cover 3;

[0032] Panel 4, hot air vent 4.1, return air vent 4.2;

[0033] 5. Outer casing, 5.1 vent;

[0034] 6 heating lamps;

[0035] lighting 7;

[0036] PTC heating module 8;

[0037] Heat hood 9;

[0038] The inlet installation angle is α, and the outlet installation angle is β. Detailed Implementation

[0039] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0040] In Example 1, as Figures 4-6 As shown, a bathroom heater includes: a panel 4 and a housing 5, which are combined into one unit. The panel 4 is provided with a hot air outlet 4.1 and a return air outlet 4.2, and the housing 5 is provided with an exhaust outlet 5.1; a plurality of heating lamps 6 and a plurality of lighting lamps 7 are arranged on the panel 4; a ventilation and heating integrated fan is installed in the cavity formed by the panel 4 and the housing 5, with a forward air outlet 2.1 connected to the hot air outlet 4.1, a reverse air outlet 2.2 connected to the exhaust outlet 5.1, and a side air inlet 2.3 connected to the return air outlet 4.2; and a PTC heating module 8 is arranged between the forward air outlet 2.1 and the hot air outlet 4.1. The integrated ventilation and heating fan includes: an impeller 1; a volute 2, whose circumferential wall has a forward air outlet 2.1 and a reverse air outlet 2.2 along the forward and reverse rotation directions of the impeller 1, respectively, and a side air inlet 2.3 is provided on the side wall of the volute 2; a motor, which is a rotary DC brushless motor that drives the impeller 1 to rotate; and a motor cover 3, which is installed on the side wall of the volute 2, forming a motor mounting space between the cover and the motor cover 2. Figures 1-3 As shown, the impeller 1 is a bidirectional multi-blade impeller, comprising: a disk 1.1 having a first surface and a second surface; a plurality of first blades 1.2, perpendicular to the first surface of the disk 1.1, extending outward from the center to the edge in a radially equidistant arrangement; and a plurality of second blades 1.3, perpendicular to the second surface of the disk 1.1, extending outward from the center to the edge in a radially equidistant arrangement; the upper and lower edge chords of the first blades 1.2 and second blades 1.3 along their cross-sections perpendicular to their width direction are arcs; the first blades 1.2 and second blades 1.3 are staggered. Specifically, the power of the rotary DC brushless motor is 24W, the speed is 2700RPM, the diameter of the impeller 1 is 84mm, and the overall width is 42mm. When the integrated ventilation and heating fan is running, the wind speeds measured at the forward outlet 2.1 and the reverse outlet 2.2 are 4.8m / s and 4.1m / s, respectively.

[0041] In Example 1, the impeller 1 has staggered first blades 1.2 and second blades 1.3 on both sides of the disc 1.1. Combined with the design of the upper and lower chord lines of the blade cross-section, the aerodynamic symmetry of forward and reverse rotation is significantly improved, so that the difference in air volume between forward and reverse rotation is ≤15%, and the wind speed in reverse rotation can reach more than 85% of that in forward rotation. Figure 2Clockwise rotation is for heating; counterclockwise rotation is for ventilation. The staggered distribution structure effectively eliminates the airflow interference problem of traditional bidirectional impellers and reduces noise. Through the integration of the flow channels of the forward air outlet 2.1, reverse air outlet 2.2, and side air inlet 2.3 in the volute 2, combined with the rotary DC motor in the casing, a single unit achieves efficient bidirectional output, reducing the volume by 40% compared to traditional dual-fan systems, and also exhibiting good performance in reverse air delivery.

[0042] In Example 1, as Figures 1-3 As shown, the width of the first blade 1.2 is greater than the width of the second blade 1.3, and the outer edges of all the first blades 1.2 are connected by a retaining ring 1.4. The widened design of the first blade 1.2, combined with the connecting structure of the retaining ring 1.4, enhances the blade rigidity and maintains a radially equidistant distribution. This reduces the amplitude during high-speed rotation, prevents airflow leakage, reduces blade tip vibration, and improves aerodynamic efficiency.

[0043] In Example 1, as Figure 3 As shown, the inlet installation angle α of the first blade 1.2 and the second blade 1.3 is greater than the outlet installation angle β. The use of a variable installation angle design (α > β) creates a forward-swept blade profile. Increasing the inlet angle α enhances airflow capture capability, while decreasing the outlet angle β reduces wake loss. Specifically, the inlet angle α is obtuse, and the inlet angle β is acute, which reduces the flow separation area under both forward and reverse rotation conditions, lowers vortex intensity, and significantly improves reverse rotation performance.

[0044] In Example 1, as Figures 1-3 As shown, the central part of the wheel 1.1 has a motor mounting cavity 1.5, and the wheel 1.1 has several flow guide channels 1.6. The rotation direction of the flow guide channels 1.6 is opposite to the bending direction of the first blade 1.2. The reverse rotation design of the flow guide channels 1.6 and the bending direction of the first blade 1.2 form a secondary guidance for the flow field, generating a pre-rotation compensation effect under reverse operation. This structure can increase the reverse air volume and reduce the pressure pulsation amplitude inside the volute 2.

[0045] In Example 1, as Figure 4 , Figure 6 As shown, with panel 4 facing vertically during installation, the integrated fan for heating and ventilation is arranged vertically, with impeller 1 and the central axis of the motor horizontally positioned. This vertical arrangement, combined with the horizontal axis design, creates a vertical flow field distribution, effectively utilizing the height space of the heater / ventilation unit. This optimizes the flow channel turning angle between the volute 2 and the hot air shroud 9 to 45°, reducing airflow resistance. This layout reduces the overall size of the unit, saving space compared to traditional models and making it suitable for installation in compact spaces.

[0046] In Example 1, as Figure 5 , Figure 6As shown, the heating lamps 6 are arranged in four groups in a matrix; the lighting lamps 7 are also arranged in four groups, nested in the gaps between adjacent groups of heating lamps 6. The matrix arrangement of the four groups of heating lamps 6 creates a uniform heat field, reducing the area of ​​dead zones in heat radiation. The design of the lighting lamps 7 embedded in the gaps improves the uniformity of illuminance and brightness. In Embodiment Two, as... Figure 7 As shown, the lighting lamp 7 uses two sets, which can also meet the usage requirements.

[0047] In Example 1, as Figure 6 As shown, the volute 2 is equipped with a hot air shroud 9 with openings at the top and bottom. The upper opening is connected to the forward air outlet 2.1, and the lower opening is connected to the hot air outlet 4.1. The PTC heating module 8 is fixed in the hot air shroud 9. The straight-through structure of the hot air shroud 9 places the PTC heating module 8 in the core area of ​​the airflow, improving heat exchange efficiency. Moreover, the modular assembly design reduces the misalignment between the heating zone and the fan flow channel.

[0048] In Example 1, the drive circuits for the motor, heating lamp 6, lighting lamp 7, and PTC heating module 8 are integrated and controlled by a microcontroller. This microcontroller-integrated control enables the coordinated operation of the motor, PTC 8, heating lamp 6, and lighting lamp 7, and allows for customization of various operating modes through PWM modulation. Furthermore, intelligent temperature control algorithms can be used to precisely control the space temperature, improving overall energy efficiency, enhancing comfort, and reducing power consumption.

[0049] Obviously, the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Other obvious variations or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A bidirectional multi-bladed impeller, characterized by, It comprises: a wheel disc (1.1) having a first face and a second face; a plurality of first blades (1.2) extending radially and equidistantly from the center to the edge of the first face of the wheel disc (1.1); a plurality of second blades (1.3) extending radially and equidistantly from the center to the edge of the second face of the wheel disc (1.1); the upper and lower edge chords of the cross section of the first blades (1.2) and the second blades (1.3) perpendicular to the width direction thereof are circular arcs; the first blades (1.2) and the second blades (1.3) are staggered.

2. A bidirectional multi-bladed impeller according to claim 1, wherein The width of the first blades (1.2) is greater than the width of the second blades (1.3), and the outer end edges of all the first blades (1.2) are connected by a fixed ring (1.4).

3. A bidirectional multi-bladed impeller according to claim 1, wherein The blade inlet installation angle (α) of the first blades (1.2) and the second blades (1.3) is greater than the blade outlet installation angle (β).

4. A bidirectional multi-bladed impeller according to claim 1, wherein The center of the wheel disc (1.1) is provided with a motor mounting cavity (1.5), and a plurality of guide channels (1.6) are provided on the wheel disc (1.1), the rotation direction of the guide channels (1.6) is opposite to the bending direction of the first blades (1.2).

5. A ventilation and heating integrated fan, characterized by, It comprises: the impeller (1) of any one of claims 1-4; a volute (2) having a positive outlet (2.1) and a reverse outlet (2.2) on the circumferential wall thereof in the positive and reverse rotation directions of the impeller (1) respectively, and a side inlet (2.3) on the side wall thereof; a motor, which is a shell rotating type direct current brushless motor, drives the impeller (1) to rotate; a motor cover (3) is installed on the side wall of the volute (2), and forms a motor mounting space between the volute (2) and the motor cover (3).

6. A bath heater, characterized by, It comprises: a panel (4) and a shell (5) combined into one, the panel (4) is provided with a hot air outlet (4.1) and a return air inlet (4.2), and the shell (5) is provided with an exhaust outlet (5.1); a plurality of heating lamps (6) and a plurality of illuminating lamps (7) arranged on the panel (4); the ventilation and heating integrated fan of claim 5 is installed in the cavity formed by the panel (4) and the shell (5), the positive outlet (2.1) is communicated with the hot air outlet (4.1), the reverse outlet (2.2) is communicated with the exhaust outlet (5.1), and the side inlet (2.3) is communicated with the return air inlet (4.2); a PTC heating module (8) is arranged between the positive outlet (2.1) and the hot air outlet (4.1).

7. The bath heater according to claim 6, characterized in that, The ventilation and heating integrated fan is arranged vertically, and the center axis of the impeller (1) and the motor is horizontally arranged.

8. The bath heater according to claim 6, characterized in that, The heating lamps (6) are arranged in four groups in a matrix, and the illuminating lamps (7) are arranged in two groups or four groups in the gaps between the adjacent two groups of heating lamps (6).

9. The bath heater according to claim 6, characterized in that, The volute (2) is provided with a hot air cover (9) with an upper opening and a lower opening, the upper opening is connected with the positive outlet (2.1), and the lower opening is communicated with the hot air outlet (4.1), and the PTC heating module (8) is fixed in the hot air cover (9).

10. The bath heater according to claim 6, characterized in that, The driving circuits of the motor, the heating lamp (6), the illuminating lamp (7) and the PTC heating module (8) are controlled by a single-chip microcomputer.

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