PTC heater capable of reducing noise

Abstract

The utility model provides a PTC heater capable of reducing noise. The PTC heater comprises a PTC heating core, two sides of the PTC heating core are respectively provided with a heat dissipation strip in parallel, a gasket is arranged between every two heat dissipation strips, and one end part of the PTC heating core is provided with a power supply connecting part. Compared with the prior art, the PTC heater has the advantages that the gaskets are arranged at the two ends of the heat dissipation strips, an air interlayer is formed between every two heat dissipation strips, superposition of sound waves of the two sound source PTC heating cores is effectively blocked, and noise is lowered.

Description

Technical Field

[0001] This utility model relates to the field of physics, and more particularly to heating devices, specifically to a PTC heater that can reduce noise. Background Technology

[0002] Currently, the air conditioning and heating of new energy vehicles mainly rely on the on-board PTC heater. Taking the air-heated PTC heater as an example, its main working principle is to supply power to the PTC controller through the on-board high-voltage battery. The air-heated heater controls its own heat generation by providing different power through its controller (the controller mainly adjusts the PTC power by adjusting the duty cycle of the supplied voltage). During the adjustment process, the PTC heating element in the heating core will vibrate with the voltage frequency due to the electrostriction effect, which will cause noise. A heater is often composed of multiple heating cores, with heat dissipation strips set between each pair of heating cores. Since each heating core and heat dissipation strip is tightly connected, when multiple independent sound sources (heating cores) are connected together, their sound waves will be linearly superimposed in this limited space, thus affecting the quietness and comfort of the entire air conditioning system. Utility Model Content

[0003] To address the aforementioned problems, the present invention provides a PTC heater that can reduce noise, comprising: a PTC heating core, a heat dissipation strip arranged parallel to each side of the PTC heating core, a gasket arranged between each pair of heat dissipation strips, and a power connection part arranged at one end of the PTC heating core.

[0004] Preferably, the gaskets are disposed at the head positions of both ends of the heat sink, and the gaskets are bonded to the heat sink with thermally conductive adhesive.

[0005] Preferably, the electrode plates in the PTC heating core can be divided into left zone electrode plates, right zone electrode plates, and common electrode plates to achieve zoned heating.

[0006] Preferably, a flexible NTC thermistor is installed inside the PTC heating core to continuously monitor the temperature inside the PTC.

[0007] Compared with the prior art, the beneficial effects of this utility model are: gaskets are provided at both ends of the heat dissipation strips, and an air gap is formed between the two heat dissipation strips, which effectively blocks the superposition of sound waves from the two sound sources PTC heating cores and reduces noise. Attached Figure Description

[0008] To more clearly illustrate the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 Schematic diagram of a PTC heater that can reduce noise

[0010] Figure 2 A schematic diagram of an explosion of a PTC heater that can reduce noise.

[0011] 1—PTC heating element; 11A—A region (positive); 11B—B region (positive); 11C—Common (negative); 2—Heat sink; 3—Gap; 4—NTC thermistor; 5—Air barrier layer; Detailed Implementation

[0012] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0013] The design will be further explained below with reference to the accompanying drawings in the structural specification.

[0014] like Figure 2 A PTC heater that can reduce noise includes: a PTC heating core (1), a heat dissipation strip (2) arranged parallel to each side of the PTC heating core (1), a gasket (3) arranged between each pair of heat dissipation strips (2), and a power connection part (11) arranged at one end of the PTC heating core (1).

[0015] Furthermore, the gasket (3) is placed at both ends of the heat sink (2). The gasket (3) and the heat sink (2) can be bonded together with thermally conductive adhesive, thus forming an air gap layer (5) between the two heat sinks (2), which effectively blocks the superposition of sound waves from the two sound sources PTC heating cores (1) and reduces the noise level. The experimental data are as follows:

[0016] Multiple comparative tests were conducted on the PTC heater of the above scheme and a conventional PTC heater in a silent chamber. The test comparison data are shown in Table 1.

[0017] Table 1. Noise Comparison between the Solution Provided by This Utility Model and PTC Heaters with Ordinary Structures

[0018] Structural state / number of samples Group 1 comparison Group 2 comparison Group 3 comparison The structural noise level of this design is [decibel level]. 38.3dB 37.2dB 38.5dB Ordinary structural noise decibels 32.8dB 32.5dB 32.9dB Noise reduction ratio 14% 12% 14%

[0019] The test data shows that adding a shim (3) between the heat sink (2) can effectively prevent noise superposition, thereby reducing the noise emitted by the PTC heating core (1) when it is working.

[0020] The PTC heating core (1) consists of a PTC heating element, electrode sheet, PI insulating film, and aluminum tube. The electrode sheet can be divided into a left zone electrode sheet (11A), a right zone electrode sheet (11B), and a common electrode sheet (11C) to achieve zoned heating. The connection method between the components is existing technology and will not be described in detail here.

[0021] Furthermore, in order to monitor the temperature inside the PTC heating core (1), a flexible NTC thermistor (4) can be installed inside it. The change in resistance is converted into a change in temperature, and the temperature inside the PTC heating core (1) can be detected in real time.

[0022] The embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles of the embodiments, their practical application, or improvements to the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A PTC heater capable of reducing noise, characterized by: PTC heating core (1), both sides of PTC heating core (1) are provided with a parallel heat dissipation strip (2), and a gasket (3) is arranged between two heat dissipation strips (2), and a power supply connecting portion (11) is arranged at one end of PTC heating core (1).

2. The PTC heater of claim 1, wherein: The gasket (3) is arranged at the two end head positions of the heat dissipation strip (2), and the gasket (3) and the heat dissipation strip (2) are connected by heat-conducting adhesive.

3. The PTC heater of claim 2, wherein: The power supply connecting portion (11) in the PTC heating core (1) can be divided into a left area electrode sheet (11A), a right area electrode sheet (11B) and a common electrode sheet (11C), so that the heating is realized in the partition.

4. The PTC heater of claim 3, wherein: A flexible NTC thermistor (4) is arranged in the PTC heating core (1), which detects the temperature in the PTC heating core (1) at any time.

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