Noise reduction structure of PTC (Positive Temperature Coefficient) fan heater

Abstract

The utility model discloses a noise reduction structure of a PTC (Positive Temperature Coefficient) fan heater, which is characterized by comprising a front shell, a PTC heating body, an air guide component, a fan and a rear shell, the front shell is provided with an air outlet. The rear shell is provided with an air inlet. The air guide assembly is arranged between the PTC heating body and the fan. The air guide assembly comprises a bottom plate, a ventilation hole and an air duct side wall. And the ventilation holes are formed in the bottom plate. And guide vanes are arranged between the side walls of the air duct. The guide vanes are planar vanes or cambered vanes. And the guide vanes are arranged in parallel relative to the horizontal plane or obliquely arranged upwards relative to the horizontal plane. And the guide vanes are downwards and obliquely arranged relative to the axial direction of the fan. The noise reduction structure of the PTC fan heater can reduce the noise value of the PTC fan heater. Compared with the PTC warm air blower without the noise reduction structure, the noise value (sound pressure level) can be reduced by about 1.2 dB (A).

Description

Technical Field

[0001] The utility model relates to the technical field of heaters, in particular to a noise reduction structure of a heater. Background Art

[0002] In order to reduce manufacturing costs, existing PTC heaters often reduce the size of the PTC heater by arranging the heat sink of the PTC heater into a tight corrugated shape. Although reducing the size of the PTC heater is conducive to reducing manufacturing costs, it also causes the adverse effect of reducing the air outlet area. The reduction in the air outlet area directly leads to an increase in the noise of the PTC heater. Therefore, it is very necessary to optimize the design of the internal air duct structure of the PTC heater to reduce the impact of the air outlet area on noise. Summary of the invention

[0003] The technical problem to be solved by the utility model is to design a noise reduction structure of a PTC heater which can reduce noise.

[0004] In order to solve the above technical problems, the utility model provides a noise reduction structure of a PTC heater, comprising a front shell, a PTC heating element, an air guide assembly, a fan and a rear shell.

[0005] The front shell is provided with an air outlet, and the rear shell is provided with an air inlet.

[0006] The air guide component is arranged between the PTC heating element and the fan.

[0007] The air guide assembly comprises a bottom plate, ventilation holes and side walls of the air duct.

[0008] The ventilation holes are arranged on the bottom plate.

[0009] Guide vanes are arranged between the side walls of the air duct.

[0010] Firstly, preferably, the guide vanes are plane vanes.

[0011] Furthermore, the guide vane can be arranged parallel to the horizontal plane or inclined upwards. When the guide vane is arranged inclined upwards relative to the horizontal plane, the elevation angle of the guide vane is in the range of 5-15°.

[0012] Preferably, the elevation angle is set to 10.43°.

[0013] Second preferably, the guide vane is a cambered vane.

[0014] Furthermore, the guide vanes are bent downward.

[0015] Furthermore, the guide blades are arranged to be tilted downward relative to the axial direction of the fan.

[0016] Furthermore, the pitch angle of the guide blade relative to the axial direction of the fan is in the range of 1-10°.

[0017] Preferably, the depression angle is set to 3°.

[0018] Beneficial effects of the utility model: Compared with the prior art, the noise reduction structure of the PTC air heater of the present application can reduce the noise value of the PTC air heater. Compared with a PTC air heater without a noise reduction structure, the noise value (sound pressure level) can be reduced by about 1.2dB (A). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the heater of the present utility model.

[0020] Figure 2 It is a structural schematic diagram of the first embodiment of the air guide assembly of the utility model.

[0021] Figure 3 It is a structural schematic diagram of a second embodiment of the air guide assembly of the utility model.

[0022] Explanation of the numbers in the figure: 1. front shell; 11. air outlet; 2. PTC heating element; 3. air guide assembly; 31. bottom plate; 32. ventilation hole; 33. side wall of air duct; 34. guide blade; 35. horizontal plane; 4. fan; 41. fan axial direction; 5. rear shell; 51. air inlet. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0029] Reference Figures 1 to 3 As shown, an embodiment of the noise reduction structure of the PTC heater of the utility model includes a front shell 1, a PTC heating element 2, an air guide component 3, a fan 4 and a rear shell 5.

[0030] The front shell 1 is provided with an air outlet 11 . The rear shell 5 is provided with an air inlet 51 .

[0031] The air guide component 3 is arranged between the PTC heating element 2 and the fan 4 .

[0032] The air guide assembly 3 includes a bottom plate 31 , ventilation holes 32 and air duct side walls 33 .

[0033] The ventilation holes 32 are disposed on the bottom plate 31 .

[0034] Guide vanes 34 are disposed between the air duct side walls 33 .

[0035] The first embodiment of the air guide assembly 3:

[0036] The guide blade 34 is a plane blade.

[0037] The guide blades 34 are arranged parallel to or inclined upward relative to the horizontal plane 35 .

[0038] The elevation angle 351 of the guide vane 34 relative to the horizontal plane 35 ranges from 5° to 15°.

[0039] The guide blades 34 are arranged to tilt downward relative to the fan axial direction 42. The angle of depression 421 of the guide blades 34 relative to the fan axial direction 42 is in the range of 1-10°.

[0040] After testing, it was found that when the elevation angle 351 was set to 10.43° and the depression angle 421 was set to 3°, better noise reduction effects could be achieved.

[0041] The second embodiment of the air guide component 3:

[0042] The guide blade 34 is a cambered blade.

[0043] The guide vane 34 is arranged to be inclined upward relative to the horizontal plane 35. The elevation angle 351 of the guide vane 34 relative to the horizontal plane 35 is in the range of 5-15°.

[0044] After testing, it was found that when the elevation angle 351 was set to 10°, a better noise reduction effect could be achieved.

[0045]

[0046] Note: The noise data is measured using a GM1356 noise tester at a distance of 1m from the heater.

[0047] By comparing the noise of heaters with and without air guide components, the average sound pressure level of the heater with an air guide component is 1.2dB (A) (sound pressure level) lower than that of the heater without an air guide component.

[0048] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field 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. A noise reduction structure for a PTC heater, characterized in that: The invention comprises a front shell (1), a PTC heating element (2), an air guide assembly (3), a fan (4) and a rear shell (5); the front shell (1) is provided with an air outlet (11); the rear shell (5) is provided with an air inlet (51); the air guide assembly (3) is arranged between the PTC heating element (2) and the fan (4); the air guide assembly (3) comprises a bottom plate (31), a ventilation hole (32) and an air duct side wall (33); the ventilation hole (32) is arranged on the bottom plate (31); and guide blades (34) are arranged between the air duct side walls (33).

2. The noise reduction structure of the PTC heater according to claim 1 is characterized in that: The guide blade (34) is a plane blade.

3. The noise reduction structure of the PTC heater according to claim 2 is characterized in that: The guide blades (34) are arranged parallel to the horizontal plane (35).

4. The noise reduction structure of the PTC heater according to claim 2, characterized in that: The guide blades (34) are arranged to be inclined upward relative to the horizontal plane (35).

5. The noise reduction structure of the PTC heater according to claim 4, characterized in that: The elevation angle (351) of the guide blade (34) relative to the horizontal plane (35) is in the range of 5-15°.

6. The noise reduction structure of the PTC heater according to claim 4, characterized in that: The guide blades (34) are arranged to be tilted downward relative to the axial direction (42) of the fan.

7. The noise reduction structure of the PTC heater according to claim 1, characterized in that: The guide blade (34) is a cambered blade.

8. The noise reduction structure of the PTC heater according to claim 7, characterized in that: The guide vanes (34) are bent downward.

9. The noise reduction structure of the PTC heater according to claim 8, characterized in that: The guide blades (34) are arranged to be tilted downward relative to the axial direction (42) of the fan.

10. The noise reduction structure of the PTC heater according to claim 6 or 9, characterized in that: The angle of depression (421) of the guide blade (34) relative to the fan axial direction (42) is in the range of 1-10°.

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