PTC (Positive Temperature Coefficient) heater with sound insulation graphite flake

Abstract

The utility model provides a PTC (Positive Temperature Coefficient) heater with a sound insulation graphite sheet, which comprises a plurality of PTC heating elements, electrode plates adhered to the upper and lower planes of the PTC heating elements, an insulating film wrapped on the peripheries of the upper and lower electrode plates and the PTC heating elements, and a pipe body, a sound insulation graphite sheet is arranged between the insulating film and the inner wall of the hollow cavity of the pipe body. The PTC heating tube has the advantages that the sound insulation graphite sheets arranged between the insulating film and the inner wall of the hollow cavity of the tube body effectively prevent noise generated by the PTC heating element in low-frequency pulse voltage from spreading outwards, and heat of the PTC heating element can be radiated to the outside quickly due to the fact that graphite has good heat conduction performance, so that the PTC heating element is prevented from being damaged, and the service life of the PTC heating element is prolonged. Therefore, the noise is reduced, and the heat dissipation effect of the PTC heating element is improved at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating, in particular to a PTC heater with a sound-insulating graphite sheet. Background Art

[0002] PTC (positive temperature coefficient) electric heater is an electric heater based on semiconductor materials. Its working principle is to use the characteristics of PTC (positive temperature coefficient) materials for heating. It can generate heat by itself when powered on. It has the advantages of high thermal efficiency, high power, no open flame, and safety. It is an ideal material for heating devices.

[0003] However, at present, PTC heaters with PWM controllers make noise when working, and the noise is relatively loud, which seriously affects the user's comfort experience. After analysis, since the main raw material of the PTC heating element is barium titanate, which is a typical perovskite structure crystal, when it works under pulse voltage, the material itself will change in length along the direction of the external electric field, thereby generating regular noise. In addition, due to the effect of hot and cold cycles, the materials will expand and contract. Since the expansion coefficients of various materials are not the same, friction and dislocation will occur between the materials under the action of heat, and noise will also be generated when rubbing against each other. Therefore, it is necessary to study how to reduce the noise of PTC heaters and improve the comfort of users. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a PTC heater with a sound-insulating graphite sheet, which is dedicated to reducing the noise generated when the PTC heater is working.

[0005] The utility model provides a PTC heater with a sound-insulating graphite sheet, comprising: a plurality of PTC heating elements, electrode sheets, which are adhered to the upper and lower planes of the PTC heating elements, an insulating film, which is wrapped around the upper and lower electrode sheets and the outer periphery of the PTC heating elements, a tube body, a hollow cavity is provided in the middle, and a sound-insulating graphite sheet is provided between the insulating film and the inner wall of the hollow cavity of the tube body to prevent the noise generated by the PTC heating elements and the insulating film when the PTC heater is working from being propagated outward.

[0006] Since graphite itself is composed of carbon elements and has a certain lubricating effect, graphite can increase the damping coefficient of noise and vibration during the transmission process, thereby achieving better sound insulation effect.

[0007] Furthermore, the graphite sheet can be made into a separate sheet and applied to the upper and lower surfaces of the insulating film respectively to form a sound insulation layer.

[0008] Furthermore, the graphite sheet can also be rolled into a cylinder and wrapped with an insulating film all around to provide all-round sound insulation.

[0009] Furthermore, an electrical connection portion is provided at the end of the electrode sheet for connecting to a power source.

[0010] Compared with the prior art, the utility model has the following beneficial effects: 1. A sound-insulating graphite sheet is arranged between the insulating film and the inner wall of the hollow cavity of the tube body, which effectively prevents the noise generated by the PTC heating element in the low-frequency pulse voltage from propagating outward; 2. Since graphite has good thermal conductivity, it can quickly radiate the heat of the PTC heating element to the outside, so while reducing noise, it also improves the heat dissipation effect of the PTC heating element. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 A schematic diagram of a PTC heater with a sound-insulating graphite sheet.

[0013] Figure 2 A cross-sectional view of a PTC heater with a sound-insulating graphite sheet.

[0014] Figure 3 Schematic diagram of noise test

[0015] Description of the symbols in the figure

[0016] 1—PTC heater; 2—electrical test bench; 3—noise analyzer

[0017] 101—tube body; 1011—hollow cavity; 102—sound-insulating graphite sheet; 103—insulating film; 104—electrode sheet; 1041—electrical connection portion; 105—PTC heating element; DETAILED DESCRIPTION

[0018] The exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0019] It should be understood that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left” and “right” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention or simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0020] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0021] The design is further explained below in conjunction with the accompanying drawings of the structural specification.

[0022] like Figure 1-3 As shown,

[0023] The utility model provides a PTC heater with a sound-insulating graphite sheet, comprising: a plurality of PTC heating elements (105), electrode sheets (104) adhered to the upper and lower planes of the PTC heating elements (105), an insulating film (103) wrapped around the upper and lower electrode sheets (104) and the outer periphery of the PTC heating elements (105), a tube (101) having a hollow cavity (1011) in the middle, and a sound-insulating graphite sheet (102) arranged between the insulating film and the inner wall of the hollow cavity (1011) of the tube to prevent the noise generated by the PTC heating elements (105) and the insulating film (103) from propagating outward when the PTC heater is working.

[0024] The manufacturing process of the PTC heater is to uniformly coat the electrode sheet (104) with thermal conductive glue, arrange the PTC heating element (105) on the electrode sheet (104) in an orderly manner, and then cover the PTC heating element (105) with another electrode sheet (104) coated with thermal conductive glue, and then wrap the insulating film (103). The prior art practice is to insert the insulating film (103) into the tube body (101) after wrapping it, and then use a press to press the tube and solidify it into a PTC heater. The difference between this embodiment and the prior art is that after wrapping the insulating film (103), a layer of sound insulation graphite sheet (102) is arranged on its outer surface, and then it is inserted into the tube body (101). The function of the sound insulation graphite sheet (102) is mainly to reduce the noise generated by the PTC heating element (105) under pulse voltage operation, and the noise generated by friction and dislocation between the materials under heat due to the different expansion coefficients of the materials. The noise generated by the insulating film (103) is relatively loud. Although the insulating film (103) is squeezed and deformed during the tube pressing process to make contact with the electrode sheet (104) and the tube body cavity wall (1011) as much as possible, a certain gap is still left. Therefore, the insulating film (103) will produce micro-movement and vibration when it is stretched or contracted or driven by other mechanical stresses, thereby generating noise.

[0025] Furthermore, the above-mentioned sound-insulating graphite sheet (102) can be made into a separate sheet and applied to the upper and lower surfaces of the insulating film (103) respectively. Since graphite can increase the damping coefficient of noise and vibration during the transmission process, it can achieve a better sound insulation effect. At the same time, the graphite material can also absorb a part of the sound wave energy (sound absorption), thereby greatly reducing the noise emitted by the PTC heating element (105) and the noise emitted by the relative movement friction generated by other materials under the action of thermal expansion and contraction.

[0026] Furthermore, the sound-insulating graphite sheet (102) can also be rolled into a tube and fully wrapped with an insulating film (103) for sound insulation.

[0027] Furthermore, an electrical connection portion (1041) is provided at the end of the electrode sheet (104) for connecting to a power source.

[0028] Multiple groups of noise test comparison experiments were conducted on the above-mentioned PTC heater with a sound insulation graphite sheet and a PTC heater without a sound insulation graphite sheet in a silent darkroom. The experimental data are shown in Table 1:

[0029] Table 1 Working noise comparison experiment table

[0030]

[0031] It can be concluded from the test data that adding sound-insulating graphite sheets to the PTC heater can effectively prevent noise from propagating outward, thereby reducing the noise generated when the PTC heater is working.

[0032] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A PTC heater with a sound-insulating graphite sheet, comprising: a plurality of PTC heating elements (105), an electrode sheet (104) adhered to the upper and lower planes of the PTC heating element (105), an insulating film (103) wrapped around the upper and lower electrode sheets (104) and the outer periphery of the PTC heating element (105), and a tube body (101) having a hollow cavity (1011) in the middle thereof, characterized in that: A sound-insulating graphite sheet (102) is provided between the insulating film and the inner wall of the hollow cavity (1011) in the tube body to prevent the noise generated by the PTC heating element (105) and the insulating film (103) from being propagated outward when the PTC heater is in operation.

2. A PTC heater with a sound-insulating graphite sheet according to claim 1, characterized in that: The sound-insulating graphite sheet (102) is attached to the upper and lower surfaces of the insulating film (103).

3. A PTC heater with a sound insulation graphite sheet according to claim 1, characterized in that: The graphite sheet is rolled into a cylinder and wrapped around the outside of the insulating film (103) for sound insulation.

4. The PTC heater with a sound insulation graphite sheet according to claim 1, characterized in that: An electrical connection portion (1041) is provided at the end of the electrode sheet (104) for connecting to a power source.

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