Air duct switching components and heaters

Abstract

The present invention discloses an air duct switching component and a heater, wherein the air duct switching component comprises an air duct, the air duct is provided with an air inlet, and a relatively independent first air outlet channel and a second air outlet; the air duct is provided with a humidifying component, a heating element is provided in the first air outlet channel, and a valve plate is provided in the air duct; the valve plate opens the first air outlet channel and closes the second air outlet, so that the first air outlet channel discharges humidified and heated air; the valve plate closes the first air outlet channel and opens the second air outlet, so that the second air outlet discharges humidified air. The air duct switching component described in the present invention places the heating element in the independent first air outlet channel, and when in the first air outlet channel, high-humidity air will not flow through the heating element, thereby preventing the heating element from rusting.

Description

Technical Field

[0001] The invention belongs to the field of heating, and in particular relates to an air duct switching component and a heater. Background Art

[0002] As a heating device, the heater generates heat through the heating device installed inside the outer shell. The power device drives the fan blades to blow out the heat generated by the heating device, thereby heating the room temperature and achieving the purpose of heating. It is widely used in the autumn and winter seasons in my country.

[0003] Since the air humidity is relatively low in winter, and the heating effect of the heater will make the air drier, thus affecting the user experience and even endangering the user's health, it is necessary to add a humidification function on the basis of the heater.

[0004] However, most of the humidifying heaters on the market currently have a single air duct, and the heating function is basically not used in the spring and summer when the air temperature is relatively high. If the heating device is turned off and only the humidification function is retained, water vapor will inevitably remain on the surface of the heating element. Long-term oxidation will cause the heating wire and other materials to rust, reducing the service life of the product. Heating will also produce harmful gases, posing a hidden danger to the user's health. Summary of the invention

[0005] The present invention provides an air duct switching component and a heater to solve the technical problem of rusting of a heating device due to water vapor mentioned in the background technology.

[0006] To achieve the above purpose, the specific technical solutions of the air duct switching assembly and the heater of the present invention are as follows:

[0007] A duct switching component comprises an duct, wherein the duct is provided with an air inlet, and a relatively independent first air outlet channel and a second air outlet; the duct is provided with a humidifying component, a heating element is provided in the first air outlet channel, and a valve plate is provided in the duct; the valve plate opens the first air outlet channel and closes the second air outlet, so that the first air outlet channel discharges humidified and heated air; the valve plate closes the first air outlet channel and opens the second air outlet, so that the second air outlet discharges humidified air.

[0008] Furthermore, the valve plate includes a rotatable air guide plate, one end of which is rotatably connected to the side wall of the air duct, and the other end of which can be rotated to the side wall of the second air outlet, so that air is discharged from the second air outlet along the air guide plate.

[0009] Furthermore, the valve plate includes a slidable baffle, and the baffle slides to open and close the second air outlet.

[0010] Furthermore, the air duct includes a power chamber, in which a rotatable impeller is provided; the power chamber is connected to the air inlet upstream, and is connected to the first air outlet channel and the second air outlet downstream.

[0011] Furthermore, the humidification component includes a wet curtain, which covers the air inlet.

[0012] Furthermore, the minimum distance between the wet curtain and the impeller is 1 / 12 to 1 / 3 of the impeller diameter.

[0013] Furthermore, the upper end of the wet curtain is located at the entrance of the power chamber, and the length of the air inlet is 5 / 6 to 5 / 3 of the impeller diameter.

[0014] Furthermore, opposite volutes and volute tongues are provided on both sides of the impeller, the volute tongue is located on the side of the impeller close to the air inlet, and the volute is located on the side of the impeller away from the air inlet.

[0015] Furthermore, the volute tongue has a windward surface which is arranged concentrically with the outer circle of the impeller, and the distance between the windward surface and the impeller is 1 / 28 to 1 / 10 of the diameter of the impeller.

[0016] Furthermore, the volute is formed with a second wind guide surface, and the second wind guide surface gradually moves away from the impeller as it moves away from the air inlet; the minimum distance between the second wind guide surface and the impeller is 1 / 22 to 1 / 11 of the impeller diameter.

[0017] Furthermore, an outlet of the power chamber is formed between the volute and the volute tongue, and an air guide grille is provided at the outlet, and a line of the air guide grille is arranged parallel to the air duct.

[0018] Further, the outlet width is 1 / 2 to 1 of the impeller diameter.

[0019] Furthermore, the distance between the heating element and the outlet is 1 to 5 times the diameter of the impeller.

[0020] A heater comprises the above-mentioned air duct switching assembly.

[0021] The air duct switching assembly and the heater of the present invention have the following advantages:

[0022] 1. Place the heating element in an independent first air outlet channel. In the first air outlet channel, high-humidity air will not flow through the heating element to prevent the heating element from rusting.

[0023] 2. Relying on the cross-flow air duct with uniform air cutting and good air supply continuity, a duct system for humidifying electric heaters with switchable heating and humidification modes is provided, which can effectively solve the problems of dry air supply from single heaters on the market and the single air duct of existing humidifying heaters and limited use seasons, thereby improving the functionality and applicability of humidifying heater products and enhancing the user's comfort experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the air duct switching assembly of the present invention;

[0025] Figure 2It is a schematic diagram of the internal structure of the air duct switching assembly of the present invention;

[0026] Figure 3 The cross-sectional view of the air duct switching assembly of the present invention Figure 1 ;

[0027] Figure 4 The cross-sectional view of the air duct switching assembly of the present invention Figure 2 ;

[0028] Figure 5 It is a cross-sectional view of the lower end of the air duct switching assembly of the present invention.

[0029] Description of the markings in the figure:

[0030] 1. Body; 11. Air inlet; 12. Power chamber; 121. Air guide grille; 13. First air outlet; 14. Second air outlet; 2. Crossflow impeller; 3. Wet curtain; 4. Water storage tank; 5. Air guide plate; 6. Baffle; 7. Heating element; 8. Volute; 81. Second air guide surface; 9. Volute tongue; 91. Windward surface; 92. First air guide surface. DETAILED DESCRIPTION

[0031] In order to better understand the purpose, structure and function of the present invention, an air duct switching assembly and a heater of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0032] like Figures 1 to 4 As shown, the air duct switching assembly of the present invention includes a fuselage 1, in which an air duct is formed, and the air duct has a power cavity 12, the power cavity 12 is connected to the air inlet 11 upstream, and the power cavity 12 is connected to two relatively independent first air outlet channels 13 and second air outlets 14 downstream. The air inlet 11 is located on the side of the lower end of the fuselage 1, the first air outlet channel 13 is located on the upper end of the fuselage 1, and the second air outlet 14 is located on the side of the upper end of the fuselage 1. Air enters the power cavity 12 from the air inlet 11, and is discharged from the first air outlet channel 13 or the second air outlet 14 through the power cavity 12.

[0033] Among them, a pneumatic component is arranged in the power chamber 12, and the pneumatic component includes a rotatable impeller, and the impeller is generally a crossflow fan wheel 2 composed of multiple impellers. The crossflow fan wheel 2 has the characteristics of uniform wind cutting and good air supply continuity, and is suitable for humidification and heating, etc., which have high requirements for flow field uniformity. The impeller is driven by the motor to rotate, so that negative pressure is generated at the air inlet 11 of the air duct, so that the external air is sucked into the air inlet 11.

[0034] A humidification component is provided at the air inlet 11, and the humidification component includes a wet curtain 3 and a water storage tank 4. The wet curtain 3 is hung at the air inlet 11 to cover the air inlet 11. The water storage tank 4 is provided at the bottom of the fuselage 1, and the lower end of the wet curtain 3 extends into the water storage tank 4. The water is stored in the water storage tank 4 to wet the wet curtain 3. When air enters from the air inlet 11, the moisture in the wet curtain 3 is convectively exchanged with the dry airflow, vaporized into high-humidity air and continued to be transported upward by the pneumatic component. In addition, the humidification components can also be respectively set to the first air outlet channel 13 and the second air outlet 14, but it is relatively wasteful and not preferred.

[0035] In order to ensure that the wet curtain 3 is soaked, a water pump can also be arranged in the water storage tank 4 to pour the water in the water storage tank 4 from top to bottom on the wet curtain 3 through the water distribution pipe. In addition to the wet curtain 3, the humidification component can also adopt atomizing sheets and the like, which can achieve a humidification effect.

[0036] In order to switch the first air outlet channel 13 and the second air outlet 14, the first air outlet channel 13 and the second air outlet 14 can be separated by a partition wall, and valves can be set respectively, one opening and one closing to achieve switching, but it is relatively space-consuming. Therefore, the space of the fuselage 1 can be shared. A straight plate is set at the end of the power chamber 12 to extend the range of the power chamber 12. The straight plate is provided with an air guide plate 5 through a rotating shaft. One end of the air guide plate 5 is rotatably connected to the side wall of the air duct, and the other end can be rotated to the side wall on one side of the second air outlet 14 to close the first air outlet channel 13. Conversely, the end of the air guide plate 5 is away from the second air outlet 14, then the first air outlet channel 13 is opened. A slidable baffle 6 is provided on one side of the second air outlet 14, and the baffle 6 slides to open and close the second air outlet 14.

[0037] Furthermore, a heating element 7 is provided in the first air outlet passage 13, and the heating element 7 heats the high-humidity air to generate high-temperature and high-humidity air.

[0038] To sum up, when the air guide plate 5 opens the first air outlet channel 13 and the baffle 6 closes the second air outlet 14, the high-humidity air discharged from the power chamber 12 is directly discharged from the first air outlet channel 13 along the air duct, and at the same time the heating element 7 heats the high-humidity air. Therefore, the first air outlet channel 13 discharges high-temperature and high-humidity air to realize the heating and humidification air supply function; when the air guide plate 5 closes the first air outlet channel 13 and the baffle 6 opens the second air outlet 14, the high-humidity air is discharged from the second air outlet 14 along the air guide plate 5, thereby realizing a single humidification air supply function.

[0039] In addition, the air guide plate 5 can slide and the baffle plate 6 can rotate to open and close, which can also achieve the above-mentioned effect. The air guide plate 5 only needs to be set at the first air outlet channel 13 instead of the air outlet of the first air outlet channel 13, so that the moisture will no longer pass through the heating element 7 when the heating element 7 is not in use. At the same time, the arc-shaped air guide plate 5 also has the function of guiding the wind direction, so that the air in the power chamber 12 is guided to the second air outlet 14.

[0040] Combination Figure 5 As shown, specifically, opposite volutes 8 and volute tongues 9 are arranged on both sides of the crossflow impeller 2, and the volute tongues 9 are located on the side of the crossflow impeller 2 close to the wet curtain 3, that is, on the upper side of the wet curtain 3; while the volute 8 is located on the side of the crossflow impeller 2 away from the wet curtain 3. Due to the limited space of the fuselage 1, the lower side of the volute tongue 9 is connected to the wet curtain 3, so the volute tongue 9 is shorter than the volute 8, otherwise, there are two volutes 8 arranged opposite to each other.

[0041] The volute tongue 9 has a windward surface 91 that is concentrically arranged with the outer circle of the impeller, so the windward surface 91 is an inner concave surface. The distance A between the windward surface 91 and the impeller and the diameter D of the impeller satisfy 1D / 28≤A≤1D / 10. A first wind-guiding surface 92 is formed on the side of the windward surface 91 close to the air inlet 11. The first wind-guiding surface 92 is a plane that extends horizontally from the edge of the windward surface 91 to the edge of the air inlet 11. Through the concentric arrangement of the windward surface 91 and the outer circle of the impeller, the volute tongue 9 plays the role of a diverter cone. The ratio of the gap of the volute tongue 9 to the outer diameter of the impeller has a significant effect on the flow rate and efficiency, and has a certain effect on the air duct pressure. When the tongue gap is larger, the fan pressure head is reduced and the flow rate is reduced; when the tongue gap is reduced, the pressure increases and the flow rate increases, but the noise peak and sound quality will also deteriorate, and it will affect the subsequent air duct conversion and impeller safety regulations. Therefore, this parameter needs to be controlled.

[0042] The volute 8 is formed with a second air guide surface 81, which gradually moves away from the impeller as it moves away from the air inlet 11. The second air guide surface 81 forms a volute throat near the impeller, and the minimum spacing B of the volute throat and the diameter D of the impeller satisfy 1D / 22≤B≤1D / 11. The increase in the distance from the crossflow impeller 2 to the volute 8 will cause the air volume to decrease, and the increase in the spacing of the volute 8 will cause the vortex area at the rear end of the volute 8 to gradually increase, resulting in an increase in turbulent noise; a too small volute throat gap will increase the unevenness of the air flow speed and pressure inside the impeller, increase the pulsation force in the area around the volute 8, and increase the rotation noise, so this parameter needs to be limited.

[0043] The crossflow impeller 2 enters the windward surface 91 of the volute tongue 9 in the air duct and rotates. An outlet is formed between the volute 8 and the volute tongue 9, and an air guide grille 121 is provided at the outlet. The air guide grille 121 is arranged parallel to the air duct, forming a vertical upward wind guiding trend at the outlet. The outlet width is b and the diameter D of the impeller, satisfying 1D / 2≤b≤D; if the outlet size is too small, the width of the wind beam at the outlet will be reduced, affecting the uniformity of the wind receiving the heating element 7, and at the same time increasing the wind resistance at this position, increasing the noise inside the air duct, and also increasing the load of the air duct and the cost of the motor; if the size is too large, it will cause uneven wind speed on the left and right sides of the outlet, reduce the outlet wind speed, and thus affect the performance of the heater.

[0044] In addition, due to the influence of the cross-flow air duct and the wind cutting direction of the wind wheel, the wind beam at its outlet is sent out along the wind cutting direction of the wind wheel, that is, on the right side, and finally affected by the fluid wall jet effect, the air is sent along the right wall of the heater, resulting in uneven distribution of the internal wind field. Therefore, adding an upward-trending air guide grille 121 at its outlet can effectively solve the above problem.

[0045] The minimum distance E between the wet curtain 3 and the impeller and the diameter D of the impeller satisfy 1D / 12≤E≤1D / 3; this technical solution limits the distance between the crossflow fan wheel 2 and the wet curtain 3 to prevent the gap between the two from being too small, which will affect the stability of the crossflow air duct, and too large, which will affect the humidification effect, so a reasonable gap range is selected.

[0046] The upper end of the wet curtain 3 is located at the entrance of the power chamber 12, and the length H of the air inlet 11 and the diameter D of the impeller satisfy 5D / 6≤H≤5D / 3; the wet curtain 3 structure made of highly hydrophilic material absorbs moisture to the entrance of the power chamber 12, and the moisture is sent to the inside of the air duct under the suction of the negative pressure at the entrance of the power chamber 12 to achieve the humidification effect. This technical solution limits the height of the wet curtain 3 covering the entrance. If the height is too low, the wind resistance at the inlet of the crossflow air duct will increase, affecting the stability of the air duct, causing surge and backflow, and affecting the utilization efficiency of the wet curtain 3, and the optimal humidification effect cannot be achieved. If the height is too large, the water absorption efficiency of the wet curtain 3 will be reduced, so a reasonable height range needs to be established.

[0047] The distance h1 between the heating element 7 and the outlet of the power chamber 12 and the impeller diameter D satisfy D≤h1≤5D; this technical solution limits the height distance between the heating element 7 and the power chamber 12. If the height of the heating element 7 and the power chamber 12 is too low, due to the high temperature of the heating element 7 itself, the internal structure of the power chamber 12 will be affected by the high temperature and deformed, affecting its aerodynamic performance. If the heating element 7 is too far away from the power chamber 12, the surface of the heating element 7 will be unevenly affected by the wind, affecting the heating effect of the heater.

[0048] The invention also discloses a heater, comprising the above-mentioned air duct switching component.

[0049] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. An air duct switching assembly, comprising an air duct, characterized in that: The air duct is provided with an air inlet, and a relatively independent first air outlet channel and a second air outlet; the air duct is provided with a humidifying component, a heating element is provided in the first air outlet channel, and a valve plate is provided in the air duct; the valve plate opens the first air outlet channel and closes the second air outlet, so that the first air outlet channel discharges humidified and heated air; the valve plate closes the first air outlet channel and opens the second air outlet, so that the second air outlet discharges humidified air; the valve plate includes a rotatable air guide plate, one end of the air guide plate is rotatably connected to the side wall of the air duct, and the other end can be rotated to the side wall of the second air outlet, so that the air is discharged from the second air outlet along the air guide plate; the valve plate includes a slidable baffle plate, and the baffle plate slides to open and close the second air outlet; the air duct includes a power chamber, in which a rotatable impeller is arranged; the upstream of the power chamber is connected to the air inlet, and the downstream of the power chamber is connected to the first air outlet channel and the second air outlet; the humidification component includes a wet curtain, which covers the air inlet; the minimum distance between the wet curtain and the impeller is 1 / 12 to 1 / 3 of the impeller diameter; opposite volutes and volute tongues are arranged on both sides of the impeller, the volute tongue is located on the side of the impeller close to the air inlet, and the volute is located on the side of the impeller away from the air inlet; an outlet of the power chamber is formed between the volute and the volute tongue; the outlet width is 1 / 2 to 1 of the impeller diameter; the distance between the heating element and the outlet is 1 to 5 times the impeller diameter.

2. The air duct switching assembly according to claim 1, characterized in that: The upper end of the wet curtain is located at the entrance of the power chamber, and the length of the air inlet is 5 / 6 to 5 / 3 of the impeller diameter.

3. The air duct switching assembly according to claim 1, characterized in that: The volute tongue has a windward surface which is arranged concentrically with the outer circle of the impeller, and the distance between the windward surface and the impeller is 1 / 28 to 1 / 10 of the diameter of the impeller.

4. The air duct switching assembly according to claim 1, characterized in that: The volute is formed with a second air guide surface, and the second air guide surface gradually moves away from the impeller as it moves away from the air inlet; the minimum distance between the second air guide surface and the impeller is 1 / 22 to 1 / 11 of the impeller diameter.

5. The air duct switching assembly according to claim 1, characterized in that: The outlet is provided with an air guide grille, and the air guide grille shape line is arranged parallel to the air duct.

6. A fan heater, characterized in that: It comprises an air duct switching component as described in any one of claims 1 to 5.

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