CN212055295U

CN212055295U - Electric heater with multiple spiral channels

Info

Publication number: CN212055295U
Application number: CN202020159586.7U
Authority: CN
Inventors: 周天昊; 韩东; 顾吉明
Original assignee: Nanjing University of Aeronautics and Astronautics
Current assignee: Nanjing University of Aeronautics and Astronautics
Priority date: 2020-02-10
Filing date: 2020-02-10
Publication date: 2020-12-01
Anticipated expiration: 2030-02-10

Abstract

The utility model discloses an electric heater with many helical coiled passage belongs to the heating technical field of blowing. Comprises a heater housing (2); wherein an air inlet cover (5) is arranged at an air inlet of the heater shell (2); wherein, a fan (4) and a multi-spiral channel structure (1) are sequentially arranged in the heater shell (2) from the air inlet to the air outlet. Different from a common electric heater, the multi-spiral channel structure can ensure that air blown by the internal fan flows through the spiral channel stably, thereby greatly reducing the flow resistance loss, improving the silencing performance and effectively reducing the wind noise of the electric heater.

Description

Electric heater with multiple spiral channels

Technical Field

The utility model relates to an electric heater with many helical coiled passage belongs to the heating technical field of blowing.

Background

The electric heater is visible everywhere in life, and the hair drier is the electric heater. Generally, a blower includes a motor, a fan and a heating element inside, the fan rotates to blow air sucked from a rear end air inlet toward a front end, and the air passes through the heating element to blow out hot air. It is well known that the operation of a hair dryer can produce several types of noise, including noise related to air flow and noise related to the operation of the motor fan. These noises affect our lives and conversations, and therefore how to reduce the noise of the hair dryer is an important issue. The noise of the motor fan can be reduced by improving the structure and materials of the motor fan, and can also be reduced by installing silencing materials. The noise generated by the high-speed air flow can be designed for the appearance structure and the inner structure of the hair dryer so as to carry out resistance noise reduction, and noise reduction equipment such as a hole type silencer, a sound absorption grating and the like can also be installed. The silencing equipment has the disadvantages of inconvenient maintenance and cleaning and the like, and the invention mainly designs the structure at the front end of the electric heater, namely in front of the air outlet.

The multi-spiral channel structure is applied to many places, and the multi-spiral channel structure is applied to the electric heater, so that the air noise can be effectively reduced. The heating element and the spiral structure are skillfully combined together, so that the space is reduced, and the heating efficiency is increased.

In summary, the present invention provides an electric heater with multiple spiral channels, which can heat efficiently and reduce noise effectively.

SUMMERY OF THE UTILITY MODEL

The invention aims to provide an electric heater with a plurality of spiral channels, which has low noise, high heating efficiency and small volume and reduces the noise of the electric heater.

An electric heater having a plurality of spiral channels, comprising: comprises a heater shell; wherein an air inlet cover is arranged at the air inlet of the heater shell; wherein, a fan and a multi-spiral channel structure are sequentially arranged in the heater shell from the air inlet to the air outlet; the multi-spiral channel structure is formed by sequentially nesting N circular tubes with different diameters from small to large, wherein N is an odd number which is more than or equal to 3; wherein the inside of the central circular tube is a cylindrical channel; a plurality of first annular channels are formed between the central circular tube and the adjacent circular tubes as well as between the other adjacent circular tubes; a second type of circular ring channel is formed between the outermost circular pipe and the heater shell; the first type of circular channel is divided into a front part and a rear part by a partition plate at the rear part, wherein the front part is a part close to the air outlet and far away from the air inlet, and the rear part is a part close to the air inlet and far away from the air outlet; the rear part of the first-type circular channel and the whole inner part of the cylindrical channel are provided with silencing cotton; the front part of the first-class circular channel is provided with spiral sheets at equal intervals in the circumferential direction, and the spiral sheets are attached to the upper surface and the lower surface to form a first-class spiral channel; the spiral sheets are arranged in the second type circular ring channel in a circumferential equidistant mode, and the spiral sheets are attached to the upper surface and the lower surface to form a second type spiral channel; the axial non-continuous arrangement mode of the spiral sheet means that the spiral sheet is composed of a plurality of sections along the axial direction in the corresponding circular ring channel; in the first type of circular ring channel and the second type of circular ring channel, the spiral pieces in the same circular ring channel have the same rotating direction, and the rotating directions of the spiral pieces in the adjacent circular ring channels are opposite; the rest round pipes except the central round pipe are provided with air guide ports; the air guide ports are alternately arranged according to the rule of arranging the air outlets close to the air inlet and arranging the air outlets close to the air inlet in a mode that the diameter of the circular tube is reduced from large to small, and the air guide ports are arranged on the circular tube at equal intervals in a circumferential discontinuous mode; the spiral sheet is provided with a heating element, or the spiral sheet itself is a heating element.

The spiral channel in the structure can reduce the resistance loss of air flowing in the channel, and increase the heating contact area, thereby maximizing the convection heat exchange quantity and improving the silencing performance. The arrangement of the spiral sheets in the second type of spiral channel adopts an axial discontinuous mode, wherein the arrangement of the discontinuous spiral sheets can ensure that air enters a circular space formed by the parts without the spiral sheets to expand after flowing through a section of spiral channel, thereby achieving the purpose of sound attenuation. The spiral pieces in the same circular channel in the multi-spiral channel structure have the same rotating direction, and the rotating directions of the spiral pieces in the adjacent circular channels are opposite. This arrangement enables the air to flow with approximately no or little resistance loss, and improves the noise reduction performance. The rest round pipes except the central round pipe are provided with air guide ports; the air guide ports are alternately arranged according to the rule of arranging the air outlets close to the air inlets and arranging the air outlets close to the air outlets in a mode that the diameter of the circular tube is from large to small, and the air guide ports are arranged on the circular tube at equal intervals in a circumferential non-continuous mode. The arrangement of the air guide opening enables air to flow stably in the channel until reaching the air outlet.

The spiral sheet is provided with a heating element, or the spiral sheet itself is a heating element. The concrete structure can be as follows: the heating element is an electric heating wire or an electric heating belt; wound on or embedded in the spiral sheet. Such an arrangement enables full use of space and heating to be achieved.

The method of the electric heater with the multi-spiral channel is characterized by comprising the following processes:

air flowing at high speed enters the multi-spiral channel at the outermost layer from the annular round port at the rear part of the multi-spiral channel structure, flows along the channels separated by the spiral sheets, then enters the channel at the inner layer from the air guide port to continue flowing, and the like, and finally is blown out from the annular air outlet in the channel at the innermost layer; the spiral channel can reduce the resistance loss of air flowing in the channel, and increase the heating contact area, thereby maximizing the convection heat exchange quantity; the opposite rotation directions of the spiral sheets in the adjacent channels can also minimize the resistance loss of the air flow, thereby improving the noise reduction performance and the heating efficiency; the arrangement of the non-continuous spiral sheets can ensure that air enters a circular space formed by the parts without the spiral sheets to expand after flowing through a section of spiral channel, thereby achieving the purpose of noise reduction.

Drawings

FIG. 1 is a schematic view of an electric heater having multiple spiral channels;

FIG. 2 is a vertically enlarged cross-sectional view of a multiple spiral channel structure having multiple spiral channels;

FIG. 3 is an enlarged left side view of the front end of an electric heater having multiple spiral channels;

FIG. 4 is an enlarged schematic view of an outer coil of an electric heater having multiple spiral channels;

FIG. 5 is an enlarged view of a middle layer coil of an electric heater having multiple spiral channels;

FIG. 6 is an enlarged schematic view of an inner coil of an electric heater having multiple spiral channels;

number designation in the figures: the air conditioner comprises a structure with 1 a plurality of spiral channels, 2 a heater shell, 3 a handle, 4 a fan, 5 an air inlet cover, 6 a spiral sheet, 7 an air guide opening, 8 an annular air outlet, 9 a cylindrical channel, 10 an annular channel, 10-1 a first annular channel and 10-2 a second annular channel.

Detailed description of the invention

The invention is further described below with reference to the accompanying drawings.

As shown in figure 1, air flowing at high speed enters the outermost multi-spiral channel from the annular round opening at the rear part of the multi-spiral channel structure 1, flows along the channels separated by the spiral sheets 6, then enters the inner-layer channel from the air guide opening 7 to continue flowing, and so on, and finally is blown out from the annular air outlet 8 in the innermost channel.

As shown in fig. 2, from the enlarged schematic cross-sectional view of the multi-spiral channel, it can be seen that the flights are relatively thin, the outermost flight spans a relatively long distance, and the inner two flights are shorter than the outer flights. And a heating element is attached to each spiral sheet to fully heat the air.

As shown in fig. 3, the outlet is a circular ring, so that the heated air is not concentrated too much, and the outlet air is soft.

As shown in FIG. 4, the outermost spiral tube has three sections of spiral sheets, each section of spiral sheet has a short distance, and the arrangement of the non-continuous spiral sheets can make air flow through a section of spiral channel and then enter a circular space formed by the non-spiral sheets to expand, so as to achieve the purpose of noise reduction. The side close to the air outlet is provided with air guide openings which are arranged at intervals along the circumferential direction, and is provided with a circular ring-shaped baffle plate, and the rear part far away from the air outlet is also provided with a circular baffle plate.

As shown in fig. 5, the middle layer spiral tube has a section of spiral sheet altogether, and one side far away from the air outlet has air guide openings arranged at intervals along the circumferential direction, and the left and right sides of the spiral sheet part are provided with circular ring-shaped baffles.

As shown in figure 6, the inner layer spiral pipe is provided with a section of spiral sheet totally without an air guide opening, and the right side of the spiral sheet part is provided with a circular ring-shaped baffle.

Claims

1. An electric heater having a plurality of spiral channels, comprising:

comprises a heater housing (2);

wherein an air inlet cover (5) is arranged at an air inlet of the heater shell (2);

wherein a fan (4) and a multi-spiral channel structure (1) are sequentially arranged in the heater shell (2) from the air inlet to the air outlet;

the multi-spiral channel structure (1) is formed by sequentially nesting N circular tubes with different diameters from small to large, wherein N is an odd number which is more than or equal to 3; wherein the inside of the central circular tube is provided with a cylindrical channel (9); a plurality of first annular channels (10-1) are formed between the central circular tube and the adjacent circular tubes and between the other adjacent circular tubes; a second annular 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 a front part and a rear part by a partition plate at the rear part, wherein the front part is a part close to the air outlet and far away from the air inlet, and the rear part is a part close to the air inlet and far away from the air outlet;

the rear part of the first-type circular channel (10-1) and the whole inner part of the cylindrical channel (9) are provided with silencing cotton;

the front part of the first-class circular channel (10-1) is provided with spiral sheets (6) at equal intervals in the circumferential direction, and the spiral sheets (6) are attached to the upper surface and the lower surface to form a first-class spiral channel;

the spiral sheets (6) are arranged in the second type circular ring channel (10-2) at equal intervals in the circumferential direction, and the spiral sheets (6) are attached to the upper surface and the lower surface to form a second type spiral channel, wherein the spiral sheets in the second type spiral channel are arranged in an axial non-continuous mode;

the axial non-continuous arrangement mode of the spiral sheet means that the spiral sheet is composed of a plurality of sections along the axial direction in the corresponding circular ring channel;

in the first type of circular channel (10-1) and the second type of circular channel (10-2), the spiral pieces (6) in the same circular channel have the same rotating direction, and the rotating directions of the spiral pieces (6) in adjacent circular channels are opposite;

the rest round pipes except the central round pipe are provided with air guide ports (7); the air guide ports are alternately arranged according to the rule of arranging the air outlets close to the air inlet and arranging the air outlets close to the air inlet in a mode that the diameter of the circular tube is reduced from large to small, and the air guide ports are arranged on the circular tube at equal intervals in a circumferential discontinuous mode;

the spiral sheet (6) is provided with a heating element, or the spiral sheet (6) is a heating element.

2. The electric heater with multiple spiral channels of claim 1, wherein:

the heating element is an electric heating wire or an electric heating belt.

3. The electric heater with multiple spiral channels of claim 2, wherein:

the electric heating wire or the electric heating belt is wound on the spiral sheet or embedded in the spiral sheet.