CN114916851A

CN114916851A - Electric heating towel rack

Info

Publication number: CN114916851A
Application number: CN202210689011.XA
Authority: CN
Inventors: 王乾新
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2022-08-19
Also published as: WO2023241735A2; WO2023241735A3

Abstract

The invention relates to an electric heating towel rack which comprises a flat heat pipe, wherein the flat heat pipe comprises a plurality of heat pipes which work independently, a phase-change heat transfer working medium is filled in the heat pipes, a cavity of the flat heat pipe is integrally formed by extrusion of aluminum or aluminum alloy, and two ends of the cavity are sealed; under the working condition of use, the flat surface of the flat heat pipe is approximately vertical to the horizontal plane, and the length direction of the flat heat pipe is approximately parallel to the horizontal plane. The electric heating towel rack provided by the invention is quick to dry, uniform to dry and safer to use.

Description

Electric heating towel rack

Technical Field

The invention relates to the technical field of towel racks, in particular to an electric heating towel rack.

Background

Towels and bath towels are used as daily necessities essential to life, are not easy to dry in humid weather, are easy to breed bacteria, and need to be dried by using an electrically heated towel rack.

The existing electric heating towel rack has two main technical schemes. The scheme is heating rod + heat-conducting liquid, and this is more traditional technical scheme, and its shortcoming is heaviness, easy weeping, and the difference in temperature is big, and the heating is slow. And the second scheme is heating the alloy wires or the carbon fibers, wherein the safety of the carbon fibers is not enough and does not pass European and American safety certification. The alloy wire heating mode has the advantages that the thick insulating layer is coated on the surface of the alloy wire heating mode, the heat conduction effect is poor, the alloy wire is in air connection with the external metal plate, the heat conduction performance is poor, the surface temperature of the towel rack drying plate is not uniform, and the surface insulating layer of the alloy wire heating wire is easy to age and leak electricity due to the fact that the alloy wire heating wire works at high temperature for a long time and is not accepted by many customers.

The electric heating towel rack in the prior art has the problems of slow drying, uneven drying, and insufficient safety and reliability.

Disclosure of Invention

The invention aims to provide an electric heating towel rack, and aims to solve the technical problems of slow drying, uneven drying, and insufficient safety and reliability of the conventional electric heating towel rack.

In order to achieve the purpose, the invention adopts the following technical scheme that the electric towel rack comprises the flat heat pipe, the flat heat pipe comprises a plurality of independently working sub heat pipes, phase-change heat transfer working media are filled in the sub heat pipes, a flat heat pipe shell and a cavity of each sub heat pipe are integrally extruded and formed by aluminum or aluminum alloy, and two ends of the flat heat pipe shell and the cavity are sealed.

According to the further technical scheme, in the scheme of the electric heating towel rack, under the working condition of using the electric heating towel rack, the flat surface of the appearance of the flat heat pipe is approximately vertical to the horizontal plane, and the length direction of the appearance of the flat heat pipe is approximately parallel to the horizontal plane.

According to a further technical scheme, in the scheme of the electric heating towel rack, under the working condition of using the electric heating towel rack, the included angle theta between the axis of the neutron heat pipe cavity in the flat heat pipe and the horizontal plane is between minus 15 degrees and theta is between 15 degrees.

According to a further technical scheme of the invention, in the scheme of the electric heating towel rack, the number of the heat sources arranged on the flat heat pipe is more than or equal to 2, and at least two heat sources are arranged at intervals.

According to the further technical scheme, grooves are formed in the wall of the sub heat pipe cavity of the flat heat pipe, and the flat heat pipe shell, the sub heat pipe cavity and the grooves are integrally formed by extrusion of aluminum or aluminum alloy.

According to a further technical scheme, in the scheme of the electric heating towel rack, the groove comprises a raised groove, the raised groove is formed by enclosing two adjacent projections arranged on the wall of a neutron heat pipe cavity of a flat heat pipe, and the length L of the bottom side of the cross section of each projection is equal to or greater than 0.2mm and equal to or less than 1.2 mm.

According to the further technical scheme, in the scheme of the electric heating towel rack, the distance D between the bottoms of the adjacent bulges meets the condition that D is more than or equal to 0.2mm and less than or equal to 1.2 mm.

According to a further technical scheme of the invention, in the scheme of the electric heating towel rack, the height H of the cross section of the bulge is more than or equal to 0.2mm and less than or equal to 1.2 mm.

According to a further technical scheme of the invention, in the scheme of the electric heating towel rack, an included angle beta between the protrusion and the wall of the heat pipe cavity is more than or equal to 92 degrees and less than or equal to 122 degrees.

According to a further technical scheme, in the scheme of the electric heating towel rack, the grooves comprise round hole grooves which are arranged on the wall of the heat pipe cavity and are approximately round in shape, the round hole grooves are provided with openings communicated with the heat pipe cavity, and the diameter phi of the round hole grooves meets the requirement that the diameter phi is more than or equal to 0.3mm and less than or equal to 1.2 mm.

The beneficial effects of the invention are:

the electric heating towel rack provided by the invention has the characteristics of quick temperature rise, uniform surface temperature, simplicity, attractiveness and higher safety.

Drawings

FIG. 1 is a schematic view of an embodiment 1 of an electrically heated towel rack according to the present invention;

FIG. 2 is a sectional view of a flat heat pipe in embodiment 1 of the present invention;

fig. 3 is a schematic view of a heat pipe structure of a flat heat pipe in embodiment 1 of the present invention;

FIG. 4 is a schematic view of an electrically heated towel rack embodiment 2 of the present invention;

FIG. 5 is a sectional view of a flat heat pipe in embodiment 2 of the present invention;

fig. 6 is a schematic view of a heat pipe structure of a flat heat pipe in embodiment 2 of the present invention;

FIG. 7 is a schematic view of an embodiment 3 of the electrically heated towel rack of the present invention;

FIG. 8 is a schematic view of a manufacturing process of a flat heat pipe according to the present invention;

FIG. 9 is a schematic view of a heat pipe heat transfer performance testing apparatus according to the present invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1, 2, and 3, embodiment 1 of the present invention includes a frame 11, a flat heat pipe 12, a heat source 13, a temperature controller 14, and a power socket 15. The frame 11 is a metal or non-metal object with certain structure and strength, and the invention does not limit the material of the frame, in this embodiment, the frame is made of high-strength aluminum alloy section. The electric towel rack at least comprises one flat heat pipe 12, which can be one flat heat pipe 12, or 2, 3, 4, 5, 6, 7 or more, and in this embodiment, 3 flat heat pipes are adopted. Under the working condition of use, the flat surface of the flat heat pipe 12 is approximately perpendicular to the horizontal plane, the length direction of the flat heat pipe 12 is approximately parallel to the horizontal plane, and the axis of the cavity of the sub heat pipe 122 in the flat heat pipe 12 is parallel to the length direction of the flat heat pipe (see fig. 2), that is, the axis of the cavity of the sub heat pipe 122 is approximately parallel to the horizontal plane. The heat source 13 of the present invention is not limited in the type of heat generation, and may be a PTC heat source, an MCH heat source, a heat generating film heat source, or the like. The heat source adopted in this embodiment 1 is a strip-shaped heating element including a PTC heating sheet, a PTC heating element is disposed at a portion of the heating element in contact with a flat heat pipe, the PTC heating element is wrapped by a PI film (i.e., a polyimide film), the PI film has strong high temperature resistance and aging resistance, an aluminum case, the PI film and the PTC heating element are tightly compacted by a press, the thermal resistance of the heating method is far less than that of an alloy wire or a carbon fiber heating method, and the insulation safety level can sufficiently meet the most severe safety certification in europe and america.

As shown in fig. 1 and fig. 2, after power is turned on, the heat source 13 generates heat, the heat is transferred to the flat heat pipe casing 121, and then is transferred to the liquid phase-change heat transfer working medium in the sub heat pipe 122, the liquid phase-change working medium absorbs heat and undergoes phase change between liquid phase and vapor phase, the vapor phase heat transfer working medium moves to the far end in the cavity of the sub heat pipe 122 by brownian motion of gas molecules, the heat is released in the low temperature region at the far end and undergoes phase change between vapor phase and liquid phase, and the liquid phase heat transfer working medium flows back to the heat source 13 by surface tension of the grooves 124 between the protrusions 123 on the cavity wall of the sub heat pipe 122, thereby completing a phase-change heat transfer cycle and sequentially and cyclically reciprocating. The rapid phase change heat transfer cycle process enables the flat heat pipe to have the heat transfer capacity hundreds times of aluminum, so that the temperature difference of each position on the flat heat pipe is small, and the surface temperature of the flat heat pipe 12 rises rapidly.

On an actual electric heating towel rack product, as many as 20 sub heat pipes 122 are arranged in the flat heat pipe 12, the phase-change heat transfer quality in each sub heat pipe 122 is very small (less than 1 g), and in most cases, even if a plurality of sub heat pipes 122 are damaged (such as drilling holes on the surface of the flat heat pipe), other sub heat pipes can still work normally, the phase-change heat transfer working medium in the damaged sub heat pipe 122 can volatilize rapidly, so that people can not perceive the heat pipe at all, and the use of the electric heating towel rack is not influenced, therefore, the electric heating towel rack of the invention can be considered to be 'liquid-tight'; in addition, in the present invention, the flat heat pipe 12 is not energized, and no electric leakage occurs even if the flat heat pipe 12 is damaged, and the highest insulation level of the PTC heat source is added, which indicates that the electric towel rack of the present invention has the highest level of safety. Therefore, compared with the traditional technical scheme of the heating rod and heat conducting liquid electric heating towel rack, the electric heating towel rack has no liquid leakage, and compared with the technical scheme of the alloy wire/carbon fiber electric heating towel rack, the electric heating towel rack has no electric leakage. The temperature difference of each position on the surface of the electric heating towel rack is about +/-1 ℃, the temperature difference of each position on the surfaces of the heating rod + heat conducting liquid and the alloy wire/carbon fiber electric heating towel rack exceeds +/-10 ℃, and the surface temperature of the electric heating towel rack is more uniform.

In the present embodiment 1, the cross-sectional structure of the flat heat pipe 12 is shown in fig. 2, and includes a heat pipe housing 121, a sub-heat pipe 122, a protrusion 123, a groove 124, and a circular hole groove 125. The heat pipe housing 121, the protrusion 123, and the circular hole groove 125 are integrally formed by extrusion of aluminum or aluminum alloy. The flat heat pipe 12 in this embodiment 1 includes six sub heat pipes 122, the number of the sub heat pipes in the flat heat pipe is not limited in the present invention, and may be 1 or 2 or 3 or more, and the number of the sub heat pipes depends on the width of the flat heat pipe 12, the temperature uniformity requirement of the product, and other requirements. The present invention does not limit whether the sub-heat pipes 122 are uniformly distributed in the flat heat pipe 12, and may be uniform or non-uniform, sometimes to meet the requirement of screw hole opening, a solid portion needs to be added between the sub-heat pipes 122 or on the side of the flat heat pipe 12, sometimes to meet the requirement of bending resistance, a circular hole needs to be added between the sub-heat pipes 122, and a hard material, such as stainless steel, is inserted into the circular hole. In the present embodiment 1, the port of the flat heat pipe 12 is sealed by laser welding, but the present invention is not limited to the sealing method of the port of the flat heat pipe, and may be one or a combination of a plurality of methods of pressure welding, brazing, and soldering. In the present embodiment 1 and the present invention, the sub heat pipes 122 in the flat heat pipe 12 work independently, which means that the phase-change heat transfer working mediums in the sub heat pipes 122 are isolated from each other. In this embodiment 1, the phase change heat transfer working medium in the sub heat pipe 122 is ethanol, but the present invention is not limited to the phase change heat transfer working medium, and may also be deionized water, acetone, ammonia water, a composite working medium, and the like. The arrangement of aluminum/aluminum-based alloy/copper alloy wires or mesh or other materials in the heat sub-pipe 122 can further improve the reflux capacity of the liquid phase-change heat transfer working medium, but in this embodiment 1, no wires or mesh are arranged.

In this embodiment 1, the cross section of the sub-heat pipe 122 in the flat-plate heat pipe 12 is shown in fig. 3, and the cross section of the cavity wall of the sub-heat pipe 122 is quadrilateral, but the invention does not limit the shape of the cross section of the cavity wall of the sub-heat pipe 122, and the cross section of the cavity wall of the sub-heat pipe 122 may also be triangular, pentagonal, hexagonal or other curved shapes. Preferably, the cavity wall of the sub-heat pipe 122 is provided with the circular hole groove 125, which can further increase the heat exchange area between the vapor-phase heat transfer working medium and the cavity wall, and simultaneously increase the backflow of the liquid-phase heat transfer working medium, but the invention does not limit whether the circular hole groove is provided on the cavity wall of the sub-heat pipe 122, the position and the number of the circular hole grooves, and the circular hole grooves may be provided at any position (including but not limited to the corner of the cavity wall) on the cavity wall of the sub-heat pipe 122, or may not be provided, or may be provided in one or more, depending on the needs. In this embodiment 1, two cavity walls of the quadrilateral cavity wall of the sub heat pipe 122 are both provided with 4 protrusions 123, the present invention does not limit the positions and the number of the protrusions set on the cavity walls, and may also be provided on one, three, or four cavity walls of the sub heat pipe 122, or may be provided with only two protrusions or three protrusions on one cavity wall, because only one protrusion is provided and cannot form a groove, if a protrusion groove is provided, at least two adjacent protrusions need to be provided.

The shape, size and spacing of the bulges on the wall of the heat pipe cavity have important influence on the heat pipe performance, and the influence comes from two aspects, namely the change of the heat exchange area of the vapor phase heat transfer working medium and the wall of the heat pipe cavity on one hand, and the change of the surface tension of the liquid phase heat transfer working medium on the wall of the cavity on the other hand, so that the reflux speed of the liquid phase heat transfer working medium is influenced, and further the heat transfer performance of the heat pipe is influenced. Therefore, it is necessary to evaluate the influence of the protrusion shape, the protrusion size and the protrusion distribution in the heat pipe on the heat transfer performance of the heat pipe.

First, parameters H, β, L, D, Φ related to the bump shape, bump size, bump distribution, and the size of the circular hole groove in the present invention are defined, and specific explanations of these parameters are as shown in fig. 3 and fig. 6:

d is the distance between two intersection points of two adjacent side edge fitting extension lines and two cavity wall fitting extension lines of two adjacent bulges on the cross section of the wall of the heat pipe cavity.

H is the vertical distance between the convex high point on the cross section of the heat pipe cavity wall and the fitting extension line of the cavity wall at the convex part.

L is the distance between two intersection points of two convex side fitting extension lines on the cross section of the wall of the heat pipe cavity and two convex cavity wall fitting extension lines.

Beta is the included angle between the tangent line at the intersection of the convex side edge fitting extension line and the convex part cavity wall fitting extension line on the cross section of the heat pipe cavity wall and the convex side edge fitting extension line.

Phi is the diameter of the round hole groove which is approximately round on the cross section of the wall of the heat pipe cavity, and refers to the diameter of the round hole with the highest fitting degree with the round hole groove.

The experimental design is carried out according to the following experimental principle, and the research and analysis are carried out on the influence of H, beta and L, D parameters on the performance of the heat pipe:

the experimental principle is as follows:

fig. 9 is a schematic layout diagram of a heat pipe 91 heat transfer performance test, which includes a heat pipe 91, a heat source 92, and three temperature measurement points (T1, T2, T3). Fig. 9 shows the heat pipe length, heat source position, and temperature measurement point position, with L1=250mm, L2=200mm, L3=25mm, and L4=5 mm. The temperature point T1 is close to the heat source and is the reference temperature point for whether the heat transfer performance test system of the heat pipe meets the test specification. The better the heat transfer performance of the heat pipe, the better the temperature uniformity in the length direction of the heat pipe, i.e. the smaller the temperature difference Δ T between T2 and T3. Thus, the heat transfer capabilities of the heat pipes can be compared by measuring the Δ T of the heat pipe surfaces.

The experimental method comprises the following steps: 5 kinds of heat pipes with different cavity wall structures are prepared, and passivation treatment is carried out on the cavity walls of the heat pipes. The cavity of the heat pipe is quadrilateral, the cavity wall is provided with a bulge, the size of the bulge is shown in table 1, the overall size of the heat pipe is 7mm multiplied by 250mm, and the wall thickness is 0.5 mm. The phase-change heat transfer working medium is a deionized water composite heat transfer working medium. The heat source for the test is a constant temperature heat source, the test temperature of the heat source is 55 ℃, the temperature control precision is +/-1 ℃, and thermocouples are adopted to measure the temperature of three temperature measuring points T1, T2 and T3, and the temperature measuring precision is +/-0.1 ℃.

Explanation of the experiment:

after the heat pipe cavity is vacuumized and filled with a heat transfer working medium, negative pressure is formed in the heat pipe at normal temperature, and the strength of aluminum alloy is not high, so that the size of the cross section of the aluminum heat pipe cannot be too large, otherwise, the cavity wall of the heat pipe can be recessed due to the negative pressure, the requirements of testing different protrusion heights H, different protrusion bottom edge lengths L, different protrusion distances D and experimental test specifications are considered, the size of the cross section of the aluminum heat pipe cannot be too small, and therefore the external dimension of the experimental heat pipe is determined to be 7mm multiplied by 250mm, and the wall thickness of the heat pipe is 0.5 mm. When the heat pipe cavity wall protrusion parameters are designed, the minimum size of H, D, L is selected to be 0.2mm, because the limit process precision of the extrusion level of the current section bar is 0.2 mm. Because at least two bulges are required to be arranged on the side wall of the heat pipe cavity wall to form a groove for improving the adsorption force of the liquid surface, the maximum distance of the bulges can only be 1.2mm for the heat pipe with the external dimension of 7mm multiplied by 250mm and the wall thickness of 0.5mm, otherwise, the bulge groove can not be formed on the side wall of the heat pipe cavity wall, so the maximum dimension of H, D is determined to be 1.2mm, and the maximum dimension of L is adjusted according to H, D and is basically near 1.2 mm. The value range of the beta angle is determined to be 90-120 degrees according to experience, and two groups of intermediate data are selected after the maximum value and the minimum value of H, D, L and beta are determined. As shown in Table 1, a heat pipe 5# having no projection was used as a control.

The test data are shown in Table 1, the heat pipe 5# without a raised structure has a delta T of 23.60 ℃ which is far greater than the evaluation standard for the heat transfer performance of the heat pipe (delta T is less than or equal to 5 ℃), which indicates that the heat pipe 5# has poor heat transfer capability under the horizontal use working condition. Experimental data of the heat pipes 1#, 2#, 3# and 4# show that the heat pipes delta T of the cavity wall structures are less than or equal to 5 ℃, which indicates that the heat transfer performance evaluation standards of the heat pipes can be met. Δ T =1.20 ℃ for heat pipe 2#, Δ T value is minimal, indicating that the parameters for optimal cavity wall configuration are located between heat pipe 1# and heat pipe 3 #. The Δ T =4.8 ℃ for sample 4#, very close to the minimum standard 5.0 ℃ for heat pipe performance, indicating that structural parameters beyond the wall of the heat pipe 4# chamber will not meet the application requirements. In addition, it was found during production that profile extrusion is not favoured when β =90 °. According to the analysis of the test data and the experience accumulated in the production process, the optimal value intervals of H, beta and L, D for describing the convex shape, size and distribution parameters of the heat pipe can be basically determined: h is more than or equal to 0.2mm and less than or equal to 1.2mm, L is more than or equal to 0.2mm and less than or equal to 1.2mm, D is more than or equal to 0.2mm and less than or equal to 1.2mm, and beta is more than or equal to 92 degrees and less than or equal to 122 degrees. According to the experimental data, the upper limit size of the diameter phi of the circular hole groove is 1.2mm, the surface tension obtained by the liquid-phase heat transfer working medium is maximum, the reflux speed of the liquid-phase heat transfer working medium is fastest, and the heat transfer performance is best, and the diameter phi is less than 0.3mm when the aluminum or aluminum alloy heat pipe shell and the circular hole groove are integrally extruded together, so that the current process level is difficult to realize, and the lower limit size of the diameter phi of the circular hole groove is 0.3mm, so that the optimal value interval of the diameter phi of the circular hole groove is not less than 0.3mm and not more than 1.2 mm.

Table 1: data table for structural parameters and heat transfer performance of heat pipe cavity wall

In this example 1, β was 115 °, L was 0.6mm, H was 0.6mm, D was 0.6mm, and φ was 0.6 mm. Under the practical application condition of the electric heating towel rack, the axis of the sub heat pipe 122 is very close to the horizontal state, the included angle between the axis and the horizontal plane is less than 1 degree in most cases, if the protrusion 123 is not arranged in the sub heat pipe 122 or the shape/size/distribution parameter of the protrusion 123 is not properly selected, the liquid-phase working medium cannot flow back to the heat source 13, or the flow-back speed is very slow, the flat heat pipe 12 cannot play a heat transfer role or the heat transfer effect is very poor, and the surface temperature difference of the flat heat pipe 12 is very large. Just by referring to the shape, size and distribution parameters of the protrusions which are optimized through experiments, the protrusions in each heat pipe in the flat heat pipe 12 are arranged, so that the liquid-phase heat transfer working medium in the sub heat pipe 122 can obtain enough capillary force to flow back to the heat source 13, the heat transfer performance of the flat heat pipe 12 is excellent, and the surface temperature difference of the flat heat pipe 12 is small.

In embodiment 2 of the present invention, as shown in fig. 4, the electric towel rack includes a frame 11, a flat heat pipe 12, a heat source 13, a temperature controller 14, a power socket 15, and a power line 16 connected between the two heat sources. Unlike embodiment 1, the heat sources 13 are provided at both ends of the flat heat pipe 12, but it is not always necessary to strictly provide the heat sources at both ends, as long as the two heat sources 12 are spaced apart at a certain interval. Due to the arrangement of the double heat sources 13, even if the axis of the sub-heat pipe 122 is not strictly parallel to the horizontal plane when the electric towel rack works, the uniformity of the surface temperature of the flat heat pipe can be guaranteed as long as the included angle between the axis and the horizontal plane is within +/-15 degrees. The reason for the dual heat source arrangement is that: in the working state of the electric heating towel rack, one heat source 13 is always arranged at the bottom of the flat heat pipe in two heat sources, so that the back-flowing liquid-phase heat transfer working medium can be obtained in time, and even in a strict horizontal state, the stroke of the liquid heat transfer working medium in the heat pipe back flowing to the heat source 13 is also reduced by half, so that the surface of the electric heating towel rack is heated more quickly, and the temperature is more uniform. It should be noted that three, four or more heat sources may be provided on the flat heat pipe according to the actual requirement or the length of the flat heat pipe.

The flat heat pipe 12 used in embodiment 2 of the present invention, as shown in fig. 5 and 6, includes a heat pipe housing 121, a sub-heat pipe 122, a protrusion 123, and a groove 124. The heat pipe case 121, the sub-heat pipe 122, and the protrusion 123 are integrally formed by extrusion of aluminum or an aluminum alloy. The difference from embodiment 1 (see fig. 3) is that in embodiment 2, the cavity walls of the six sub heat pipes 122 (see fig. 6) are circular, and no circular hole grooves are provided. In example 2, β on the wall of the sub heat pipe 122 is 100 °, L is 0.5mm, D is 0.5mm, and H is 0.5 mm.

In embodiment 3 of the present invention, as shown in fig. 7, the electric towel rack includes a frame 11, a flat heat pipe 12, a heat source 13, a temperature controller 14, and a power socket 15. Unlike the embodiment 1, the axis of the cavity of the sub-heat pipe 122 in the embodiment 3 is not parallel to the horizontal base line H, but forms an included angle θ, the included angle θ is between-15 ° and 15 °, that is, one end of the sub-heat pipe 122 is high and the other end is low, and the heat source 13 is disposed at the lower end of the sub-heat pipe 122, and in this embodiment, the included angle is about 8 °. Due to the included angle, the liquid phase-change heat transfer working medium can timely flow back to the heat source under the action of gravity, and normal operation of phase-change heat transfer circulation is guaranteed. The heat pipe is provided with a protrusion forming groove and a round hole groove with an opening, the purpose of the groove is to enhance the reflux capacity of the liquid phase-change heat transfer medium, if the heat pipe can work at a certain upward inclination angle, the protrusion or the round hole groove with the opening does not need to be arranged, and certainly, if the two modes are adopted simultaneously, the effect is better.

The manufacturing process of the flat-plate heat pipe 12 in embodiment 3 of the present invention, as shown in fig. 8, includes the flat-plate heat pipe 12 and the sub-heat pipe 122. Firstly, when a flat heat pipe profile is extruded, solid parts are reserved on two sides of a flat heat pipe, the axis of a neutron heat pipe cavity 122 in the extruded flat heat pipe is parallel to the frame of the flat heat pipe, then the part outside a virtual frame A in the flat heat pipe is cut off, and the flat heat pipe with an inclination angle can be manufactured, and the axis of the heat pipe is not parallel to the frame of the flat heat pipe.

In addition, a positive and negative ion generator can be arranged at the top of the electric towel rack in the embodiments 1, 2 and 3, air is ionized under the action of a high-voltage electric field, a large number of positive ions and negative ions are generated and float near the surface of the towel, the positive ions and the negative ions attract each other in pairs, meet bacteria on the surface of the towel in the process of mutual attraction, and generate current in electrolytes in bacterial cells, so that the aim of sterilization is fulfilled. Compared with the negative ion generator, the positive and negative ion generator has better sterilization effect, and people do not need to leave the site during sterilization compared with the ozone generator.

In the description of the invention, the cavity wall means that after the protrusion is cut off and/or the circular hole groove is filled, according to the surface characteristics of the cavity outside the protrusion and the circular hole groove, a virtual surface obtained by cutting off the region after the protrusion is cut off and/or the circular hole groove is filled is obtained by fitting, and the virtual surface and the region which is not cut off and/or filled form the cavity wall.

In the description of the present invention, the meaning of horizontal, nearly horizontal, and substantially horizontal in the lengthwise direction of the heat pipe and the flat heat pipe appearance means that the angle η with the horizontal plane satisfies-5 ° η ≦ 5 °. The horizontal, approximately horizontal and approximately horizontal meaning of the axis of the sub heat pipe of the flat heat pipe means that the included angle theta between the horizontal plane and the sub heat pipe is more than or equal to minus 5 degrees and less than or equal to 5 degrees.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be understood by those skilled in the art that the specification as a whole and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An electric heating towel rack is characterized by comprising a flat heat pipe, wherein the flat heat pipe comprises a plurality of sub heat pipes which work independently, phase change heat transfer working media are filled in the sub heat pipes, a shell of the flat heat pipe and a cavity of each sub heat pipe are integrally extruded and formed by aluminum or aluminum alloy, and two ends of the shell are sealed.

2. An electrically heated towel rack according to claim 1 wherein the flat surface of the flat heat pipe appearance is substantially perpendicular to the horizontal plane and the length of the flat heat pipe appearance is substantially parallel to the horizontal plane when the electrically heated towel rack is in use.

3. An electric towel rack according to claim 1, wherein under the operating condition of the electric towel rack, the included angle theta between the axis of the sub-heat pipe cavity in the flat heat pipe and the horizontal plane satisfies the range of-15 degrees to theta 15 degrees.

4. An electrically heated towel rack according to claim 1 wherein the number of heat sources provided on the flat heat pipes is greater than or equal to 2, at least two heat sources being spaced apart.

5. An electrically heated towel rack according to claim 1 wherein the walls of the sub-heat pipe cavities of the flat heat pipes are provided with grooves, the flat heat pipe housing, the sub-heat pipe cavities and the grooves being integrally extruded from aluminium or an aluminium alloy.

6. An electric towel rack according to claim 5, wherein the grooves comprise raised grooves which are defined by two adjacent projections arranged on the wall of the sub-heat pipe cavity of the flat heat pipe, and the length L of the bottom side of each projection is 0.2 mm-1.2 mm.

7. An electrically heated towel rack according to claim 5 wherein the spacing D between adjacent raised bases of the projections satisfies 0.2mm ≦ D ≦ 1.2 mm.

8. An electrically heated towel rack according to claim 5, wherein the raised cross-sectional height H is 0.2mm ≦ H ≦ 1.2 mm.

9. An electrically heated towel rack according to claim 5, wherein the angle β between the protrusions and the wall of the heat pipe cavity is 92 ° β 122 °.

10. An electrically heated towel rack according to any one of claims 5 to 9 wherein the channels comprise circular hole channels of approximately circular shape provided in the walls of the sub-heat pipe cavities, the circular hole channels being provided with openings communicating with the sub-heat pipe cavities, the diameter of the circular hole channels being such that 0.3mm ≤ Φ ≤ 1.2 mm.