WO2018000497A1

WO2018000497A1 - Vapour generator and vapour device

Info

Publication number: WO2018000497A1
Application number: PCT/CN2016/092391
Authority: WO
Inventors: 邵帅
Original assignee: 苏州范王式机电科技有限公司
Priority date: 2016-06-29
Filing date: 2016-07-29
Publication date: 2018-01-04
Also published as: CN205782798U

Abstract

Disclosed is a vapour generator (100), comprising: a substrate (110), provided with a vapour pipe cavity (112) extending in a circuitous shape therein; several printed thermal resistors (120), attached to the surface of the substrate (110) and used for heating the vapour pipe cavity (112); and a parallel conductor (130), attached to the surface of the substrate (110) and used for parallel connection of the printed thermal resistors (120).

Description

Steam generator and steam equipment

Technical field

The invention relates to the field of steam generation technology, in particular to a steam generator and a steam device. Background technique

Currently, steam generators in steam equipment (e.g., ironing machines, etc.) generally employ a large volume boiling principle. Specifically, a resistance wire heating tube is generally placed at the bottom of the cast aluminum container, and the bottom wall of the container is heated by a resistance wire heating tube, and then the bottom wall of the container transfers heat to the water at the bottom of the container, and then passes through natural convection heat transfer and boiling in the pool, and finally Produce steam.

The steam generator described above has a large thermal inertia, which causes the container to heat up slowly, and the warm-up time is long; and the cooling is also slow, and the steam continues to flow for a long time after the power is turned off. Summary of the invention

Based on this, it is necessary to provide a steam generator with a small thermal inertia for the problem caused by the large thermal inertia of the existing steam generator.

A steam generator comprising:

a base body having a steam chamber extending in a meandering shape;

a plurality of printed heating resistors attached to the surface of the substrate and used to heat the steam chamber;

And parallel conductors attached to the surface of the substrate and used to connect the printed heating resistors in parallel.

The steam generator of the present invention adopts a printed heating resistor and a meandering steam tube cavity design. The vaporization principle is forced convection heat transfer and boiling in the tube. The heat transfer coefficient is high, the thermal inertia is small, the matrix heats up quickly, and the preheating time is short; the base body cools quickly, and the steam has a short time after power failure. In addition, the steam generator of the invention has a fast heating speed, is easy to separate water vapor, and achieves a better steam drying effect.

In one embodiment, the printed heating resistors are strip-shaped and arranged in parallel.

In one embodiment, the printed heating resistor has a width of 1 to 5 mm.

In one embodiment, the material of the substrate is selected from the group consisting of ceramic, quartz glass, or plastic. In one embodiment, the material of the substrate is metal, and the steam generator further includes a surface attached to the substrate and used to insulate the substrate from the printed heating resistor and the substrate and the parallel The insulating layer of the conductor.

In one embodiment, the material of the insulating layer is selected from the group consisting of glass glaze, polyimide, or polyethylene terephthalate.

In one embodiment, the insulating layer has a thickness of 10 to 50 μm.

In one embodiment, the printed heat generating resistor is screen printed from a conductive paste; the conductive paste is selected from the group consisting of conductive carbon paste, palladium silver paste or molybdenum manganese paste.

In one embodiment, the parallel conductors are screen printed by conductive copper paste.

In one embodiment, the steam lumen is in the form of a planar spiral, a tubular spiral, or an S-shaped bend.

In one embodiment, the printed heating resistors are non-uniformly distributed on the substrate. The invention also provides a steam apparatus.

A steam plant comprising a steam generator provided by the present invention.

In the above steam equipment, since the steam generator provided by the present invention is used, the warm-up time is short, and the steam renewal time after the power-off is short. It is also easy to separate water vapor to achieve better steam drying effect.

In one embodiment, the steaming device is an ironing machine, a humidifier, a steam mop, steaming DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a partial cross-sectional view showing a steam generator of an embodiment.

2 is a schematic plan view showing the development of a printed heat generating resistor and a parallel conductor according to an embodiment.

3 is a perspective view of a base of an embodiment.

Figure 4 is a schematic cross-sectional view of the substrate of Figure 3.

Figure 5 is a perspective view of a base of another embodiment.

Figure 6 is a perspective view of a base of still another embodiment.

Figure 7 is a perspective view of a base of still another embodiment. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that when an element is referred to as being "set to" another element, it can be directly on the other element or the element can be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or. The terms "vertical", "horizontal", "left", "right", and the like, as used herein, are for the purpose of illustration and are not intended to be the only embodiment.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning meaning meaning The terminology used in the description of the present invention is for the purpose of describing particular embodiments, and is not intended to limit the invention. This article The term "and I or" used includes any and all combinations of one or more of the associated listed items.

Referring to Figures 1-4, a steam generator 100 in accordance with one embodiment of the present invention includes a substrate 110, an insulating layer 140, a printed heating resistor 120, and a parallel conductor 130.

Wherein, the base body 110 has a steam lumen 112 therein; that is, the base body 110 is composed of a steam lumen 112 and a wall 111 for forming a vapor lumen 112. The primary function of the substrate 110 is to house and heat a fluid (e.g., water). The fluid opens from one end of the base 110 into the steam lumen 112. The wall 111 conducts heat from the printed heating resistor 120 to the fluid in the steam lumen 112. The fluid flows in the vapor lumen 112 and simultaneously undergoes a phase change and eventually transforms. The vapor emerges from the other end of the base 110.

In the present embodiment, referring to Fig. 3, in order to facilitate the formation of the insulating layer 140 and the printing of the heating resistor 120, the outer surface of the wall 111 of the substrate 110 is at least partially planar. The wall 111 of the base 110 has a flat surface so that the insulating layer 140 and the printed heat generating resistor 120 can be formed on the base 110. Of course, it is understood that a flat surface may not be provided on the outer surface of the wall 111. In the present embodiment, the base 110 is assembled from three parts, with a porous profile 118 in the middle, and the end of the porous profile 118 is an end cap 119. The vapor tube 112 is formed after the porous profile 118 is assembled with the two end caps 119. The intermediate porous profiles 118 each have a flat surface X. The insulating layer 140 and the printed heat generating resistor 120 are formed on the plane X. Of course, it can be understood that the base 110 can also be integrally formed, for example, bent by a tube. For example, as shown in Fig. 5, the base 110 is bent by a tube four times.

In the present invention, the steam lumen 112 extends in a meandering manner, that is, the steam lumen 112 adopts a meandering design, and the fluid repeatedly changes the flow direction when flowing in the steam lumen 112. This increases the contact area and contact probability of the fluid with the heat generating surface, and improves the efficiency of heating and vaporization. Fluid inside the steam lumen 112 It is forced convection heat transfer and forced convection boiling, and its heat transfer coefficient is several times of natural convection heat transfer and large volume boiling.

In the present embodiment, the steam lumen 112 is S-shaped. Of course, it can be understood that the bypass design of the steam lumen 112 is not limited to the S-shaped bending, but may also be a planar spiral. For example, as shown in FIG. 6, the base 110 is bent by a tube along a plane spiral. The steam chamber inside is a flat spiral. The steam lumen 112 can also have a tubular spiral shape. For example, as shown in Fig. 7, the base body 110 is spirally bent along a space by a tube, and the steam chamber inside thereof has a tubular spiral shape.

The material of the substrate 110 is generally selected from materials having better thermal conductivity. In the present embodiment, the material of the base 110 is metal. Preferably, the metal is selected from the group consisting of aluminum alloys, stainless steels, or copper alloys. Of course, it is to be understood that the material of the substrate 110 in the present invention is not limited to metal, but may be an insulating material. For example, the material of the substrate 110 is selected from ceramic, plastic, or quartz glass. More specifically, the ceramic may be selected from alumina ceramics or magnesia ceramics or the like.

The insulating layer 140 is attached to the surface of the substrate 110, and its main function is to insulate between the substrate 110 and the printed heating resistor 120 and to insulate the substrate 110 from the parallel conductor 140. The insulating layer 140 may be entirely attached to the surface of the substrate 110 or may be located only in the area on the surface of the substrate 110 corresponding to the printed heat generating resistor 120 and the parallel conductor 140. Of course, it can be understood that in the case where the material of the base 110 is an insulating material, the insulating layer 140 may not be provided.

Preferably, the material of the insulating layer 140 is glass glaze, polyimide (PI), or polyethylene terephthalate (PET). Thus, the insulating layer 140 has a small thermal resistance and an extremely fast heat transfer rate, which is advantageous for reducing thermal inertia. When the insulating layer 140 is a glass glaze layer, it may be coated on the surface of the substrate 110 by a coating process such as screen printing. When the insulating layer 140 is a polyimide film layer or a polyethylene terephthalate film layer, it may be coated on the surface of the substrate 110 by means of bonding.

Preferably, the insulating layer 140 has a thickness of 10 to 50 μm. Thus, the thickness of the insulating layer 140 is thin. It can transfer heat quickly and meet the requirements of heat resistance and insulation performance.

Wherein, the printed heating resistor 120 is attached to the surface of the substrate 110; its main function is to convert the electric energy into heat and transfer it to the substrate 110, thereby heating the fluid in the steam chamber 112.

In the present embodiment, the printed heating resistor 120 is printed on the surface of the insulating layer 140 by a screen printing process (directly printed on the surface of the substrate 110 in the absence of the insulating layer 140); that is, the conductive paste is used. Silk is printed on the surface of the insulating layer 140, and then the conductive paste is thermally cured or sintered to form a printed thermal resistor 120. The screen printing process is simple and mature, the cost is low, and the technical parameters such as adjusting the power density of the printed thermal resistor 120 can be conveniently controlled. Generally, the conductive paste has a square resistance greater than 10 Ω. This makes it possible to generate a larger power density with a smaller volume of the printed heat generating resistor 120, which improves the heat generation efficiency of the printed heat generating resistor 120, and further reduces the size of the printed heat generating resistor 120.

In this embodiment, the conductive paste is selected from the group consisting of conductive carbon pastes. Of course, the conductive paste may also be palladium silver paste or molybdenum manganese paste or the like. In the case of selecting a suitable type of conductive paste in combination with a suitable vapor lumen 112, the printed heating resistor 120 can achieve a heating rate of up to 200 ° C / sec.

Referring to FIG. 2 in detail, in the present invention, there are a plurality of printed heating resistors 120 distributed on the substrate.

110 most of the surface. Specifically, the printed heat generating resistor 120 is non-uniformly distributed on the surface of the substrate 110. The printing can be designed according to the different power required for the four stages of vaporization (convection, boiling, drying, superheating), the thermal conductivity and heat capacity of the substrate 110 and the insulating layer 140, the heat transfer coefficient of the fluid, and the flow velocity. The distribution of the heating resistor 120.

Preferably, the printed heat generating resistors 120 are strip-shaped and arranged in parallel; this is more advantageous for printing the printed heat-generating resistor 120, and also for controlling and adjusting the power density distribution of the printed heat-generating resistor 120 on the surface of the substrate 110. In the present embodiment, the printed heat generating resistor 120 has a rectangular shape.

Further, the width of the printed heating resistor 120 is 1 to 5 mm. This makes it easy to control the thickness of the print Degree and uniformity. In the present embodiment, the width of the printed heat generating resistor 120 is 2 mm. In the present embodiment, the length direction of the printed heat generating resistor 120 is parallel to the extending direction of the steam pipe 112; this facilitates designing the power density and length of the printed heat generating resistor 120 on the corresponding pipe in different heat exchange stages. Of course, it can be understood that it is not limited to the above form.

Wherein, the parallel conductors 130 are also attached to the surface of the substrate 110, and their main function is to connect the printed heat-generating resistors 120 in parallel. Specifically, there is one parallel conductor 130 at each end of the printed heat generating resistor 120 (both left and right in Fig. 2). The parallel conductor 130 includes an outer connecting portion 131 connected to the outside and a parallel portion 132 electrically connected to each of the printed heat generating resistors 120. In the present embodiment, the parallel section 132 has a strip shape extending in a direction perpendicular to the extending direction of the printed heat generating resistor 120. In order to facilitate the connection, the outer connecting portion 131 has a square shape. In the present embodiment, the two outer connecting sections 131 are divided into two sides (upper and lower sides in Fig. 2) on the printed heat generating resistor. Of course, it can be understood that the two outer connecting sections 131 can also be located on the same side, or other suitable places.

In this embodiment, the parallel conductor 130 is also formed by a screen printing process; preferably, after the printed heating resistor 120 is formed, the electrode paste is printed on the substrate 110 or the insulating layer 140, and then the electrode paste is thermally cured or sintered. It is formed into a parallel conductor 130. In this embodiment, the electrode paste is selected from the group consisting of conductive copper pastes. This facilitates the connection of the parallel conductor 130 to the external power source through the splicing. Of course, the electrode slurry may also be a molybdenum manganese slurry or the like. The general selection principle is as follows: The electrode paste of the parallel conductor 130 is preferably made to have a conductivity higher than that of the conductive paste of the printed heating resistor 120. The resistance of the parallel conductor 130 thus formed is small, so that the voltage drop generated is small, and the parallel connection between the respective printed heating resistors can be better realized.

Of course, it can be understood that in some less demanding applications, the parallel conductor 130 can also be printed together with the printed heating resistor 120, that is, the parallel conductor 130 and the printed heating resistor 120 are formed of the same slurry. In order to further protect the printed heating resistor 120 and the parallel conductor 130, the present invention may also provide a protection device (not shown) outside the printed heating resistor 120 and the parallel conductor 130. The protection device may be a protective film overlying the printed heating resistor 120 and the parallel conductor 130, and may also be a protective grid to prevent the printed thermal resistance 120 and the parallel conductor 130 from being in unnecessary contact with other objects. Of course, it can be understood that, in some cases, the protection device may not be provided.

Compared with the prior art, the steam generator of the invention has small thermal inertia, fast heating of the substrate, and short preheating time; the base body cools quickly, and the steam has a short time after power failure. The steam generator of the invention adopts the vaporization principle as forced convection heat transfer and boiling in the tube, has high heat exchange coefficient, fast heating speed, easy water vapor separation, and achieves better steam drying effect. Further, the printed heat-generating resistors may have different distributions in different regions, thereby having different power densities, and the steam drying effect can be further improved by adjusting the power density according to the power required for the four stages of vaporization.

In the steam generator of the prior art, the container cavity made by the process such as cast aluminum has a fixed volume and shape, and cannot be applied to various practical and complicated use environments. The steam generator of the present invention can select different base materials and wall thicknesses to suit different applications; it is convenient to design different cavity shapes and sizes to suit different environments.

The prior art steam generators are directional in their installation and use, which may result in poor vaporization, unstable steam temperatures, or even steam generation. However, the steam generator of the present invention is installed and used without directionality and can work normally in any direction.

The steam generator in the prior art has a complicated structure, and the sealing is prone to problems, and there is a risk of water leakage, steam leakage or even explosion. The steam generator of the invention has a simple structure, reliable sealing, no water leakage, steam leakage or explosion, etc. Risk; In addition, it has the advantages of fewer parts, fewer preparation steps and simpler, and lower manufacturing costs.

The invention also provides a steam apparatus. A steam plant comprising a steam generator provided by the present invention.

The steam apparatus of the present invention may be an ironing machine, a humidifier, a steam mop, a steam cosmetic machine or a steamer.

In the above steam equipment, since the steam generator provided by the present invention is used, the warm-up time is short, and the steam renewal time after the power-off is short. And the installation and use are not directional, and can work normally in any direction. In addition, the manufacturing cost of the steam equipment can be effectively reduced.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-mentioned embodiments are merely illustrative of several embodiments of the invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

Claim

A steam generator, comprising:

a base body having a steam chamber extending in a meandering shape;

The steam generator according to claim 1, wherein the printed heat generating resistors are strip-shaped and arranged in parallel.

3. A steam generator according to claim 1, wherein the material of the substrate is selected from ceramic, quartz glass, or plastic.

4. The steam generator according to claim 1, wherein the material of the base body is metal, the steam generator further comprising a surface attached to the base body and for insulating the base body and the printing a heating resistor and an insulating layer between the substrate and the parallel conductor.

The steam generator according to claim 4, wherein the material of the insulating layer is selected from the group consisting of glass glaze, polyimide, or polyethylene terephthalate.

The steam generator according to claim 1, wherein the printing heating resistor is screen printed by a conductive paste; the conductive paste is selected from the group consisting of conductive carbon paste, palladium silver paste or molybdenum manganese slurry. .

7. The steam generator according to claim 1, wherein the steam lumen is a flat spiral, a tubular spiral, or an S-shaped bend.

The steam generator according to claim 1, wherein the printed heat generating resistor is non-uniformly distributed on the substrate.

A steam apparatus, comprising the steam generator according to any one of claims 1-8 Health device.

10. A steam plant according to claim 9, wherein the steam device is an ironing machine, a humidifier, a steam mop, a steam cosmetic machine, or a steamer.