Electric heater and infrared physiotherapy instrument

Abstract

The utility model discloses an electric heater which comprises a main framework, a front wall is arranged on the front surface of the main framework, a rear wall is arranged on the rear surface of the main framework, a heating film is arranged in the main framework, the front wall is used for transmitting infrared rays radiated by the heating film, and the rear wall is used for transmitting or reflecting the infrared rays radiated by the heating film. The front wall comprises a first fiber net and a first metal net which are sequentially arranged, and the first metal net is adjacent to the heating film; the utility model further discloses an infrared physiotherapy instrument which adopts the electric heater. Due to the adoption of the double-layer structure, the front wall is ensured to have a good anti-scalding effect and better touch strength, the use is safe and reliable, and the quality is high.

Description

Technical Field

[0001] The utility model relates to the technical field of electrothermal technology, and particularly relates to an electric heater and an infrared physiotherapy apparatus. Background Art

[0002] A radiant electric heater is a device that emits far-infrared radiation for heating by a heating film. It is overall thin and light, convenient for storage and use, and infrared radiation also has a physiotherapy effect at a specific wavelength, and the product has a high recognition rate.

[0003] The front wall and the rear wall of the existing heating film type electric heater are both single-layer structures. Especially for the front wall part, since it is clearly stipulated in the electric heater specification that when a person touches the front wall, it needs to ensure within a certain deformation range to avoid contact with the heating film on the front wall and cause safety accidents. Therefore, in the design structure of the front wall, high-strength materials are commonly used, such as a metal front wall or a high-temperature resistant plastic front wall. However, the metal front wall has a risk of scalding, and the preparation cost of the plastic front wall is high. When strength needs to be guaranteed, the preparation thickness is relatively thick, which increases the overall weight of the electric heater. There is also a front wall made of a heat-resistant polymer material such as aramid paper by punching, which is complex to manufacture and has a high cost. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide an electric heater and an infrared physiotherapy apparatus, which adopt a double-layer structure to ensure that the front wall has a good anti-scalding effect and good touch strength, and is safe, reliable and of high quality in use.

[0005] To solve the above technical problem, the utility model provides an electric heater, which includes a main skeleton. A front wall is arranged on the front surface of the main skeleton, and a rear wall is arranged on the rear surface. A heating film is arranged inside the main skeleton. The front wall is used to transmit the infrared rays radiated by the heating film, and the rear wall is used to transmit or reflect the infrared rays radiated by the heating film;

[0006] The front wall includes a first fiber mesh and a first metal mesh arranged in sequence, and the first metal mesh is arranged adjacent to the heating film.

[0007] Further, a first step installation part is arranged on the surface of the main skeleton corresponding to the front wall. First C-shaped clamping grooves are arranged on both step surfaces of the first step installation part. The first fiber mesh and the first metal mesh are fixed to the corresponding first C-shaped clamping grooves through pressing strips.

[0008] Further, a first sub-skeleton is arranged on the front surface of the main skeleton, and the first step installation part is arranged on the first sub-skeleton.

[0009] Further, the rear wall is used to reflect the infrared rays radiated by the heating film. The rear wall includes a first reflective layer and a first fiber cloth arranged in sequence. The first reflective layer is arranged adjacent to the heating film. The first fiber cloth is a grid cloth woven from heat-resistant fibers. The heat-resistant fibers are preferably aramid or methyl aramid.

[0010] Further, a second stepped mounting portion is provided on the surface of the main frame corresponding to the rear wall. Second C-shaped card slots are provided on both stepped surfaces of the second stepped mounting portion. The first reflective layer and the first fiber cloth are fixed to the corresponding second C-shaped card slots through a pressure strip.

[0011] Further, a second sub-frame is provided on the rear surface of the main frame, and the second stepped mounting portion is provided on the second sub-frame.

[0012] Further, the first reflective layer and the first fiber cloth are compounded into an integral structure.

[0013] Further, the rear wall is used to transmit the infrared rays radiated by the heating film. The rear wall includes a second fiber mesh and a second metal mesh arranged in sequence. The second metal mesh is arranged adjacent to the heating film. The second metal mesh is a steel wire mesh, and the steel wire mesh is 10-30 mesh; the second fiber cloth is a grid cloth woven from heat-resistant fibers. The heat-resistant fibers are preferably aramid or methyl aramid.

[0014] Further, a second stepped mounting portion is provided on the surface of the main frame corresponding to the rear wall. Second C-shaped card slots are provided on both stepped surfaces of the second stepped mounting portion. The second fiber mesh and the second metal mesh are fixed to the corresponding second C-shaped card slots through a pressure strip.

[0015] Further, a second sub-frame is provided on the rear surface of the main frame, and the second stepped mounting portion is provided on the second sub-frame.

[0016] An infrared physiotherapy device includes the electric heater described in any one of the above.

[0017] Advantages of the present utility model:

[0018] 1. A double-layer structure with a gap is adopted as the front wall. The front wall includes a fiber mesh and a metal mesh. The metal mesh is on the inner side and the fiber mesh is on the outer side. When a person touches the fiber mesh, they cannot touch the metal mesh. Moreover, the fiber mesh has good heat insulation and non-heat-conducting effects, and the surface temperature is within the touchable range, thus effectively avoiding scalding of the human body. The existence of the gap can prevent the metal mesh from damaging the fiber mesh after heating up. The double-layer structure of metal mesh + fiber mesh (heat-resistant) achieves the effect of not being hot enough to hurt the human body while meeting the product strength requirements, and at the same time greatly improves the transmittance of infrared rays.

[0019] 2. The C-shaped card slot cooperates with the pressing strip, which can effectively tension and fix the front wall, with good fixing effect and convenient operation.

[0020] 3. By using the main skeleton and the auxiliary skeleton to install the front wall and the rear wall, modules with the same frame and different functions can be formed. Different functional modes of the electric heater can be assembled through different module combinations. The modules can be prefabricated in advance to meet the requirements of quickly responding to different mode orders. The module installation only needs to be locked with screws, and no large-scale assembly operations such as pressing are required during the overall assembly process, which will not cause damage and pollution to the installed parts, greatly improving the product quality. The components can be prepared modularly, which is convenient for the organization and management of production, reduces the types of components, improves the product quality, is convenient for unified packaging materials and other basic components, and is conducive to standardization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the single-direction and double-direction radiation electric heater of the present invention;

[0022] Figure 2 is a schematic diagram of the front wall installation structure of the present invention using the first auxiliary skeleton;

[0023] Figure 3 is a schematic diagram of the reflective rear wall installation structure of the present invention using the second auxiliary skeleton;

[0024] Figure 4 is a schematic diagram of the rear wall structure of the present invention using the second auxiliary skeleton through which the heat can pass. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments given are not intended to limit the present invention.

[0026] Refer to Figure 1 and Figure 2 As shown, in the embodiment of the electric heater of the present invention, the electric heater is also a far-infrared energy generator or a heater, which includes a main skeleton 1. A front wall 2 is provided on the front surface of the main skeleton, and a rear wall 3 is provided on the rear surface. A heating film 4 is provided inside the main skeleton. The front wall is used to transmit the infrared rays radiated by the heating film, and the rear wall is used to transmit or reflect the infrared rays radiated by the heating film; when the rear wall is used to reflect the infrared rays radiated by the heating film, the electric heater is a single-direction heating structure, and when the rear wall is used to transmit the infrared rays radiated by the heating film, both the front and rear surfaces of the electric heater can be used for heating, that is, a double-direction heating structure.

[0027] In order to ensure that the human body does not come into contact with the heating film when touching the front wall, the front wall is designed as a double-layer structure. The front wall includes a first fiber mesh 7 and a first metal mesh 8 arranged in sequence. A first stepped mounting portion is provided on the surface of the main skeleton corresponding to the front wall. First C-shaped clamping grooves 6 are provided on both stepped surfaces of the first stepped mounting portion. The first fiber mesh and the first metal mesh are fixed to the corresponding first C-shaped clamping grooves through a pressing strip 9. The first stepped mounting portion is used to define the mounting spacing between the first fiber mesh and the first metal mesh. The first metal mesh is arranged adjacent to the heating film.

[0028] The above-mentioned first metal mesh is a wire mesh, with the wire mesh being 16-25 meshes and the wire diameter being 0.1-0.2 mm. The first fiber mesh can be a grid cloth made of aramid or methyl aramid. In the longitudinal and transverse directions of the fiber mesh, there are 15-30 holes in every 10 cm length. The gram weight of the grid cloth is >50 g / m². There is a large space occupancy ratio between the surface of the grid cloth and its mesh holes, reducing the blockage of the infrared rays radiated outward and ensuring the heating effect of the electric heater. The first fiber mesh is a heat-insulating material, and users will not be scalded when touching the first fiber mesh, ensuring safety. Moreover, the first fiber mesh is thin in thickness, light in weight, and good in surface touch feeling, having great advantages compared with the metal material panel. The first metal mesh is adjacent to the heating film. The first metal mesh is used to limit the deformation amount of the first fiber mesh towards the heating film. When the human body touches and presses the first fiber mesh, the first fiber mesh deforms towards the heating film. At this time, the first metal mesh blocks the deformed first fiber mesh through its own strength after installation and fixation, thereby preventing the first fiber mesh from coming into contact with the heating film. The wire diameter of the first metal mesh is small. After overlapping with the first fiber mesh, it only needs to ensure that the holes overlap in the direction perpendicular to the surface, that is, the first metal mesh does not leak out, and it can ensure that when the human body touches the first fiber mesh, it will not touch the first metal mesh through the holes on its surface, and also ensures the infrared transmittance.

[0029] In order to improve production efficiency and quality, a first sub-skeleton 10 is provided on the front surface of the main skeleton. The first stepped mounting portion is provided on the first sub-skeleton. By adopting the cooperation of the main skeleton and the first sub-skeleton, the front wall can be prepared synchronously during the assembly of the main skeleton and its components, greatly improving the production efficiency. Moreover, the first sub-skeleton can be fixed to the main skeleton by a locking method, and the assembly is convenient. A second sub-skeleton 11 is also provided on the rear surface of the main skeleton. Refer to Figure 3As shown in the figure, the rear wall is arranged on the second secondary skeleton, so that the rear wall can also be prepared synchronously, further improving the preparation efficiency. And according to the product design requirements, a radiation component with a through structure is arranged on the second secondary skeleton to form Module 1, and a reflection component with a reflection structure is arranged on the second secondary skeleton to form Module 2. Module 1 and Module 2 can be stored and assembled according to the product's requirements for the radiation component or the reflection component, so as to form a unidirectional radiation electric heater or a bidirectional radiation electric heater. And the first secondary skeleton can also be the same as the second secondary skeleton, thus also forming Module 1, that is, Module 1 can be used for both the front wall and the rear wall, greatly reducing the complexity of the components, enabling the components to be standardized in design, facilitating management and assembly, and also improving the product quality.

[0030] When the rear wall adopts a reflection function, refer to Figure 3 As shown in the figure, the rear wall includes a first reflection layer 12 and a first fiber cloth 13 arranged in sequence. The first reflection layer and the first fiber cloth are fixed to the corresponding second C-shaped card slots through a pressing strip. A second step mounting portion is arranged on the main skeleton corresponding to the rear wall. Of course, when there is a second secondary skeleton, the second step mounting portion is on the second secondary skeleton. The second step mounting portion is used to limit the mounting distance between the first reflection layer and the first fiber cloth. The first reflection layer is arranged adjacent to the heating film. The first fiber cloth is made of an adiabatic material and can be woven into a planar structure with aramid or methyl aramid. After a gap is formed between the first reflection layer and the first fiber cloth, the heat on the first reflection layer will not be directly transferred to the first fiber cloth, ensuring that the surface temperature of the first fiber cloth is within the touchable range. Of course, the first reflection layer can also be compounded with the first fiber cloth into an integral structure. In this case, only one second C-shaped card slot is needed to complete the assembly.

[0031] In order to form the same Module 1 for the front wall and the rear wall, a second step mounting portion is arranged on the surface of the main skeleton corresponding to the rear wall. Of course, when there is a second secondary skeleton, the second step mounting portion is on the second secondary skeleton. Second C-shaped card slots are arranged on both step surfaces of the second step mounting portion. The rear wall includes a second fiber mesh 14 and a second metal mesh 15 arranged in sequence. Refer to Figure 4 As shown in the figure, the second fiber mesh and the second metal mesh are fixed to the corresponding second C-shaped card slots through a pressing strip. The second step mounting portion is used to limit the mounting distance between the second fiber mesh and the second metal mesh. The second metal mesh is arranged adjacent to the heating film. The materials, structures, and principles of the second fiber mesh and the second metal mesh can all refer to those of the first fiber mesh and the first metal mesh and are the same as them.

[0032] And the first secondary skeleton and the second secondary skeleton can also be set to have the same structure, which can further improve the degree of modularization.

[0033] Based on the above embodiments, the present application adopts the selective combination of frame modules, and can, on the premise of the same frame, realize different functional modes of the electric heater through different module combinations:

[0034] 1. The same frame (main skeleton) + front net component (front wall that can radiate outward) + rear cloth component (rear wall that can reflect) = unidirectional radiation electric heater;

[0035] 2. The same frame (main skeleton) + front net component (front wall that can radiate outward) + rear net component (rear wall that can radiate outward) = bidirectional radiation electric heater.

[0036] According to the combination of different modules, it is convenient for users to select products according to their actual needs, and different combinations are suitable for different groups of people. It is also convenient for the organization, arrangement and management of production, reduces the types of components, improves product quality, is convenient for unified packaging materials and other basic components, and is convenient for standardization, thereby further reducing the preparation cost.

[0037] The function of the metal mesh is to transmit infrared rays. While having sufficient strength, the metal wires are thin enough so that the hole ratio of the metal mesh is high enough, and the infrared rays are blocked as little as possible. Its hole ratio is greater than 90%, and its strength is high enough to meet the requirements of steel ball impact, such as the requirements of UL1278 for steel ball impact, the requirements of GB4706.1 for impact force and deformation, etc. (Hole ratio: the ratio of the area of the holes on the cross-section of the mesh to the total area of the mesh).

[0038] The function of the fiber mesh is to cover the outer surface of the metal mesh to form the appearance surface of the product, so that users do not directly contact the metal, and the outer surface of the product will not scald users when the product works and generates heat. When the fiber mesh uses low thermal conductivity materials such as methyl methacrylate or aramid, due to its very low thermal conductivity coefficient, the surface temperature of the fiber mesh will not scald people even if it is relatively high.

[0039] The front wall adopts the combination of metal mesh + fiber mesh. Due to the high strength of the metal mesh, the strength requirement for the fiber mesh is greatly reduced, so that the fiber mesh can be woven with thinner wires, and the woven mesh holes can be as large as possible. The mesh holes reach 3 - 5 mm, and its hole ratio can reach 75%. The hole ratio after the combination of the metal mesh and the fiber mesh > 65% (the theoretical value is 67.5%), so that the front wall has a high far-infrared transmittance, greatly improving the far-infrared radiation energy intensity of the product. At the same power, the temperature of the heating film is reduced.

[0040] The present application also discloses an infrared physiotherapy device, which adopts the above electric heater, and uses the far-infrared heat generated by the heating film in the electric heater to act on the body to achieve a health physiotherapy effect.

[0041] The above embodiments are only preferred embodiments given to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. An electric heater, characterized in that: It comprises a main frame, a front wall is arranged on the front surface of the main frame, a rear wall is arranged on the rear surface, a heating film is arranged inside the main frame, the front wall is used to transmit infrared rays radiated by the heating film, and the rear wall is used to transmit or reflect infrared rays radiated by the heating film; The front wall includes a first fiber mesh and a first metal mesh which are arranged in sequence, and the first metal mesh is arranged adjacent to the heating film.

2. The electric heater according to claim 1, characterized in that: A first step mounting portion is provided on the main frame surface corresponding to the front wall, and first C-shaped slots are provided on both step surfaces of the first step mounting portion. The first fiber mesh and the first metal mesh are fixed to the corresponding first C-shaped slots through pressure strips.

3. The electric heater according to claim 2, characterized in that: A first sub-frame is arranged on the front surface of the main frame, and the first step mounting portion is arranged on the first sub-frame.

4. The electric heater according to claim 1, characterized in that: The rear wall is used to reflect the infrared rays radiated by the heating film. The rear wall includes a first reflecting layer and a first fiber cloth arranged in sequence. The first reflecting layer is arranged adjacent to the heating film. The first fiber cloth is a mesh cloth woven from high-temperature resistant fibers. The high-temperature resistant fibers are preferably aramid or methyl methacrylate.

5. The electric heater according to claim 4, characterized in that: A second step mounting portion is provided on the main frame surface corresponding to the rear wall, and second C-shaped slots are provided on both step surfaces of the second step mounting portion. The first reflective layer and the first fiber cloth are fixed to the corresponding second C-shaped slots through pressure strips.

6. The electric heater according to claim 5, characterized in that: A second sub-frame is arranged on the rear surface of the main frame, and the second step mounting portion is arranged on the second sub-frame.

7. The electric heater according to claim 1, characterized in that: The rear wall is used to transmit the infrared rays radiated by the heating film. The rear wall includes a second fiber mesh and a second metal mesh arranged in sequence. The second metal mesh is arranged adjacent to the heating film. The second metal mesh is a steel wire mesh with a mesh size of 10-30. The second fiber mesh is a mesh cloth woven from high-temperature resistant fibers. The high-temperature resistant fibers are preferably aramid or methyl methacrylate.

8. The electric heater according to claim 7, characterized in that: A second step mounting portion is provided on the main frame surface corresponding to the rear wall, and second C-shaped slots are provided on both step surfaces of the second step mounting portion. The second fiber mesh and the second metal mesh are fixed to the corresponding second C-shaped slots through pressure strips.

9. The electric heater according to claim 8, characterized in that: A second sub-frame is arranged on the rear surface of the main frame, and the second step mounting portion is arranged on the second sub-frame.

10. An infrared physiotherapy device, characterized in that: It comprises the electric heater as described in any one of claims 1 to 9.

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