Electric heater with multiple spiral channels and method

Abstract

The present invention discloses an electric heater with multiple spiral channels and a method, belonging to the technical field of air blowing heating. The heater comprises a heater housing (2); wherein an air inlet cover (5) is arranged at the air inlet of the heater housing (2); wherein a fan (4) and a multiple spiral channel structure (1) are arranged in sequence from the air inlet to the air outlet inside the heater housing (2). Different from ordinary electric heaters, the multiple spiral channel structure can make the air blown by the internal fan flow smoothly through the spiral channel, greatly reducing the flow resistance loss, improving the silencing performance, and effectively reducing the wind noise of the electric heater.

Description

Technical Field

[0001] The invention relates to an electric heater with multiple spiral channels and a method thereof, belonging to the technical field of blowing heating. Background Art

[0002] Electric heaters can be seen everywhere in life, and a hair dryer is a type of electric heater. Usually, a hair dryer includes a motor, a fan, and a heating element. The fan rotates to blow the air sucked from the rear air inlet to the front end, and the air passes through the heating element to blow out hot air. As we all know, the operation of a hair dryer will produce several types of noise, including noise related to air flow and noise related to the operation of the motor fan. These noises will affect our lives and conversations, so how to reduce the noise of the hair dryer is a very important issue. The noise of the motor fan can be reduced by improving the structure and materials of the motor fan, or by installing silencing materials. The noise generated by the high-speed flow of air can be reduced by designing the external structure and internal structure of the hair dryer for resistance silencing, or silencing equipment can be installed, such as a hole-type silencer, a sound-absorbing grille, etc. The silencing equipment has disadvantages such as inconvenient maintenance and cleaning. The present invention mainly designs the structure at the front end of the electric heater, that is, before the air outlet.

[0003] The multi-spiral channel structure is used in many places. Applying the multi-spiral channel structure to the electric heater can effectively reduce air noise. The heating element and the spiral structure are cleverly combined to reduce space and increase heating efficiency.

[0004] In summary, the present invention provides an electric heater with multiple spiral channels that can heat efficiently and effectively reduce noise. Summary of the invention

[0005] The object of the present invention is to provide an electric heater with multiple spiral channels and a method for reducing the noise of the electric heater, which has low noise, high heating efficiency and small size.

[0006] An electric heater with multiple spiral channels, characterized in that: it includes a heater shell; an air inlet cover is provided at the air inlet of the heater shell; a fan and a multiple spiral channel structure are sequentially provided inside the heater shell from the air inlet to the air outlet; the multiple spiral channel structure is composed of N circular tubes with different diameters nested in sequence from small to large, wherein N is an odd number greater than or equal to 3; the interior of the central circular tube is a cylindrical channel; a number of first-class circular channels are formed between the central circular tube and the adjacent circular tubes, as well as the remaining adjacent circular tubes; a second-class circular channel is formed between the outermost circular tube and the heater shell; the first-class circular channel is divided into front and rear parts by a partition at the rear, wherein the front part refers to the part close to the air outlet and away from the air inlet, and the rear part refers to the part close to the air inlet and away from the air outlet; the rear part of the first-class circular channel and the entire interior of the cylindrical channel are arranged with sound-absorbing cotton; the front part of the above-mentioned first-class circular channel is arranged with spiral sheets at equal circumferential spacing, and the spiral sheets are fitted with the upper and lower surfaces to form the first-class spiral channel; The spiral blades in the first type of spiral channel are arranged in an axially continuous manner or an axially discontinuous manner; the spiral blades are arranged in an axially equidistant manner throughout the entire interior of the second type of circular channel, and the spiral blades are fitted with the upper and lower surfaces to form the second type of spiral channel; the spiral blades in the second type of spiral channel are arranged in an axially discontinuous manner; the axially discontinuous arrangement of the spiral blades means that the spiral blades are composed of several sections along the axial direction in the corresponding circular channel; in the first type of circular channel and the second type of circular channel, the spiral blades in the same circular channel have the same rotation direction, and the spiral blades in adjacent circular channels have opposite rotation directions; air guide ports are arranged on the remaining circular tubes except the central circular tube; the air guide ports are arranged alternately according to the rule of arrangement close to the air outlet-arrangement close to the air inlet in a descending order of the diameter of the circular tube, and the air guide ports are arranged on the circular tube in an axially discontinuous manner at equal intervals; heating elements are arranged on the spiral blades, or the spiral blades themselves are heating elements.

[0007] The spiral channel in the above structure can reduce the resistance loss of air flowing in the channel, and increase the heating contact area, so as to maximize the convective heat exchange and improve the silencing performance. The arrangement of the spiral blades in the second type of spiral channel adopts an axial discontinuous manner, wherein the arrangement of the discontinuous spiral blades can make the air flow through a section of the spiral channel and then enter the annular space formed by the part without spiral blades to expand, thereby achieving the purpose of silencing. In the above multi-spiral channel structure, the spiral blades in the same annular channel have the same rotation direction, and the spiral blades in adjacent annular channels have opposite rotation directions. Such an arrangement can make the air flow almost without resistance loss or make the resistance loss very small, which can improve the silencing performance. The remaining circular tubes other than the above central circular tube are all provided with air guide ports; the above air guide ports are arranged alternately according to the law of arrangement close to the air outlet-arrangement close to the air inlet in a manner from large to small according to the diameter of the circular tube, and the above air guide ports are arranged on the circular tube in a circumferential discontinuous manner at equal intervals. The arrangement of the air guide ports allows the air to flow smoothly inside the channel until the air outlet.

[0008] The spiral sheet is provided with a heating element, or the spiral sheet itself is a heating element. The specific structure may be: the heating element is an electric heating wire or an electric heating belt; it is wound on the spiral sheet or embedded in the spiral sheet. Such an arrangement can make full use of the space and provide sufficient heating.

[0009] The method of the electric heater with multiple spiral channels is characterized by comprising the following process:

[0010] High-speed air flows into the outermost multi-spiral channel from the annular circular opening at the rear of the multi-spiral channel structure, flows along the channels separated by the spiral blades, then enters the inner channel from the air guide port and continues to flow, and so on, and finally blows out from the annular air outlet in the innermost channel; the above-mentioned spiral channel can reduce the resistance loss of air flowing in the channel, and increase the heating contact area to maximize the convective heat exchange; the opposite rotation direction of the spiral blades in adjacent channels can also minimize the resistance loss of air flow, thereby improving the sound insulation performance and heating efficiency; the arrangement of discontinuous spiral blades allows the air to flow through a section of the spiral channel and then enter the circular space formed by the part without spiral blades to expand, thereby achieving the purpose of sound insulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of an electric heater having multiple spiral channels;

[0012] Figure 2 It is a vertically enlarged cross-sectional view of a multi-spiral channel structure having multiple spiral channels;

[0013] Figure 3 It is an enlarged left view of the front end of an electric heater with multiple spiral channels;

[0014] Figure 4 It is an enlarged schematic diagram of the outer spiral tube of an electric heater with multiple spiral channels;

[0015] Figure 5 It is an enlarged schematic diagram of a middle-layer spiral tube of an electric heater with multiple spiral channels;

[0016] Figure 6 It is an enlarged schematic diagram of the inner spiral tube of an electric heater with multiple spiral channels;

[0017] Names of the reference numerals in the figure: 1 multi-spiral channel structure, 2 heater housing, 3 handle, 4 fan, 5 air inlet cover, 6 spiral blade, 7 air guide port, 8 annular air outlet, 9 cylindrical channel, 10 annular channel, 10-1 first type of annular channel, 10-2 second type of annular channel. Specific implementation methods

[0018] The present invention is further described below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, high-speed air flows into the outermost multi-spiral channel from the annular circular opening at the rear of the multi-spiral channel structure (1), flows along the channels separated by the spiral blades (6), then enters the inner channel from the air guide port (7) and continues to flow, and so on, and finally blows out from the annular air outlet (8) in the innermost channel.

[0020] like Figure 2 As shown, from the enlarged schematic diagram of the multi-spiral channel cross-section, it can be seen that the spiral blades are thinner, the span of the outermost spiral blade arrangement is longer, and the inner two layers are shorter than the outer layer. A heating element is attached to each spiral blade to fully heat the air.

[0021] like Figure 3 As shown, the air outlet is in a circular shape, which can prevent the heated gas from being too concentrated and make the air outlet gentle.

[0022] like Figure 4 As shown, the outermost spiral tube has three sections of spiral blades, and there is a short distance between each section of spiral blades. The arrangement of non-continuous spiral blades allows the air to flow through a section of the spiral channel and then enter the annular space formed by the part without spiral blades to expand, thereby achieving the purpose of noise reduction. There are air guide ports arranged at intervals along the circumference on the side close to the air outlet, and there is a circular baffle, and there is also a circular baffle at the rear away from the air outlet.

[0023] like Figure 5 As shown, the middle-layer spiral tube has a total of one section of spiral sheets, and the side away from the air outlet has air guide ports arranged at intervals along the circumferential direction, and there are circular baffles on both sides of the spiral sheet part.

[0024] like Figure 6 As shown, the inner spiral tube has a total of one spiral sheet, no air guide port, and a circular baffle on the right side of the spiral sheet.

Claims

1. An electric heater with multiple spiral channels, characterized in that: comprising a heater housing (2); An air inlet cover (5) is provided at the air inlet of the heater housing (2); A fan (4) and a multi-spiral channel structure (1) are sequentially arranged inside the heater housing (2) from the air inlet to the air outlet; The multi-spiral channel structure (1) is composed of N circular tubes with different diameters nested in order from small to large, wherein N is an odd number greater than or equal to 3; the interior of the central circular tube is a cylindrical channel (9); a plurality of first-type circular channels (10-1) are formed between the central circular tube and adjacent circular tubes, as well as between the remaining adjacent circular tubes; and a second-type circular channel (10-2) is formed between the outermost circular tube and the heater shell (2); The first type of circular channel (10-1) is divided into two parts, front and rear, by a partition at the rear, wherein the front part refers to a part close to the air outlet and away from the air inlet, and the rear part refers to a part close to the air inlet and away from the air outlet; The rear part of the first type of annular channel (10-1) and the entire interior of the cylindrical channel (9) are arranged with sound-absorbing cotton; The spiral sheets (6) are arranged at equal circumferential intervals at the front of the first type circular channel (10-1), and the spiral sheets (6) are fitted with the upper and lower surfaces to form the first type spiral channel; the spiral sheets in the first type spiral channel are arranged in an axially continuous manner or an axially discontinuous manner; The spiral sheets (6) are arranged in a circumferentially evenly spaced manner throughout the second type of annular channel (10-2), and the spiral sheets (6) are fitted with the upper and lower surfaces to form the second type of spiral channel; the spiral sheets in the second type of spiral channel are arranged in an axially discontinuous manner; The above-mentioned axial non-continuous arrangement of the spiral plate means that the spiral plate is composed of several sections along the axial direction in the corresponding circular channel; In the first type of circular channel (10-1) and the second type of circular channel (10-2), the spiral plates (6) in the same circular channel have the same rotation direction, and the spiral plates (6) in adjacent circular channels have opposite rotation directions; The remaining circular tubes other than the central circular tube are all provided with air guide ports (7); the air guide ports are arranged alternately according to the order of large to small diameter of the circular tubes and the rule of being arranged close to the air outlet and close to the air inlet; the air guide ports are arranged on the circular tubes in a circumferentially non-continuous manner and at equal intervals; The spiral blade (6) is provided with a heating element, or the spiral blade (6) itself is a heating element.

2. The electric heater with multiple spiral channels according to claim 1, characterized in that: The heating element is an electric heating wire or an electric heating belt.

3. The electric heater with multiple spiral channels according to claim 2, characterized in that: The electric heating wire or electric heating belt is wound on the spiral sheet or embedded in the spiral sheet.

4. The method of claim 1, wherein the electric heater has multiple spiral channels. The process includes: The high-speed air flows into the outermost multi-spiral channel from the annular circular opening at the rear of the multi-spiral channel structure (1), flows along the channels separated by the spiral blades (6), then enters the inner channel from the air guide port (7) and continues to flow, and so on, and finally blows out from the annular air outlet (8) in the innermost channel; The above-mentioned spiral channel can reduce the resistance loss of air flowing in the channel and increase the heating contact area to maximize the convective heat exchange; the opposite rotation directions of the spiral blades in adjacent channels can also minimize the resistance loss of air flow, thereby improving the sound insulation performance and heating efficiency; the arrangement of discontinuous spiral blades allows the air to flow through a section of the spiral channel and then expand into the annular space formed by the part without spiral blades, thereby achieving the purpose of sound insulation.

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