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) warm air blower, which is characterized by comprising a front shell, a PTC heating body, a fan assembly, an air guide assembly and a rear shell, one end of the air guide assembly is a first end face with a small area, and the other end of the air guide assembly is a second end face with a large area. The first end face is arranged behind the fan. The second end face is arranged in the front of the rear shell. The first end face and the second end face of the air guide assembly are in a circular ring shape. Furthermore, the air guide assembly further comprises a side face connected with the first end face and the second end face. The inner surface of the side face is provided with guide vanes arranged along the center of the first end face in an array mode. And the guide vanes incline upwards relative to the horizontal plane. And the air inlet is circular. The air inlet is provided with grid bars arranged along a center array. The grid bars are bent towards the rotating 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 2.2 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 which can reduce the noise of a PTC heater.

[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, a fan assembly, an air guide assembly and a rear shell.

[0005] The front shell is provided with an air outlet. The fan assembly includes a fan. The rear shell is provided with an air inlet.

[0006] One end of the air guide assembly is a first end surface with a smaller area, and the other end is a second end surface with a larger area. The first end surface is arranged at the rear of the fan. The second end surface is arranged at the front of the rear shell.

[0007] Furthermore, the first end surface and the second end surface of the air guide assembly are in the shape of a circular ring.

[0008] Furthermore, the air guide assembly also includes a side surface connecting the first end surface and the second end surface.

[0009] First preferably, the side surface extends from the first end surface to the second end surface along a straight line.

[0010] Second preferably, the side surface extends from the first end surface to the second end surface along a curve that bends inward.

[0011] Furthermore, the inner surface of the side surface is provided with guide vanes arranged in a central array along the first end surface.

[0012] Furthermore, the guide vanes are inclined upward relative to a horizontal plane.

[0013] Preferably, when the elevation angle of the guide blade relative to the horizontal plane is 35°, not only the wind speed at the air outlet can be increased but also a better noise reduction effect can be achieved.

[0014] Preferably, the air inlet is circular.

[0015] Furthermore, the air inlet is provided with grille bars arranged along a central array.

[0016] Furthermore, the grid bars are bent toward the rotation direction of the fan.

[0017] 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 2.2dB (A). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the heater of the present utility model.

[0019] Figure 2 It is a cross-sectional view of the air guide assembly of the utility model.

[0020] Figure 3 It is a side structural schematic diagram of the first embodiment of the air guide assembly of the utility model.

[0021] Figure 4 It is a side structural schematic diagram of the second embodiment of the air guide assembly of the utility model.

[0022] Figure 5 It is a schematic diagram of the back structure of the heater of the utility model.

[0023] Explanation of the numbers in the figure: 1. front shell; 11. air outlet; 2. PTC heater; 3. fan assembly; 31. fan; 32. fan rotation direction; 33. horizontal plane; 331. elevation angle; 4. air guide assembly; 41. first end face; 42. second end face; 43. side face; 431. inner surface; 44. straight line; 45. curve; 46. guide blade; 5. rear shell; 51. air inlet; 52. grille. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 do not represent the only implementation method.

[0030] Reference Figures 1 to 5 As shown, an embodiment of the noise reduction structure of the PTC heater of the present invention includes a front shell 1, a PTC heating element 2, a fan assembly 3, an air guide assembly 4 and a rear shell 5.

[0031] The front shell is provided with an air outlet 11. The rear shell 5 is provided with an air inlet 51.

[0032] The fan assembly 3 includes a fan 31. One end of the air guide assembly 4 is a first end surface 41 with a smaller area, and the other end is a second end surface 42 with a larger area. The first end surface 41 is arranged at the rear of the fan 31. The second end surface 42 is arranged at the front of the rear housing 5.

[0033] The first end surface 41 and the second end surface 42 of the air guide component 4 are in the shape of a circular ring.

[0034] The air guide assembly 4 further includes a side surface 43 connecting the first end surface 41 and the second end surface 42 .

[0035] The first embodiment of the air guide assembly 4 : the side surface 43 extends from the first end surface 41 to the second end surface 42 along the straight line 44 .

[0036] The second embodiment of the air guide assembly 4 : the side surface 43 extends from the first end surface 41 to the second end surface 42 along an inwardly curved curve 45 .

[0037] The inner surface 431 of the side surface 43 is provided with guide vanes 46 arranged in an array along the center of the first end surface 41 .

[0038] The guide blade 46 is inclined upward relative to the horizontal plane 33. When the elevation angle 331 of the guide blade relative to the horizontal plane 33 is 35°, not only the wind speed at the air outlet can be increased, but also a better noise reduction effect can be achieved.

[0039] The air inlet 51 is circular. The air inlet 51 is provided with bars 52 arranged along a central array. The bars 52 are bent toward the fan rotation direction 32. When the bars 52 are arranged in an array with an interval of 15°, a width of 2 mm, and an arc of 0.88, a larger air inlet area can be achieved, and the test of the type B test finger can be passed.

[0040]

[0041] Note: The noise data is measured using a GM1356 noise tester at a distance of 1m from the heater.

[0042] 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 2.2dB (A) (sound pressure level) lower than that of the heater without an air guide component.

[0043] 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), a fan assembly (3), an air guide assembly (4) and a rear shell (5); the front shell is provided with an air outlet (11); the rear shell (5) is provided with an air inlet (51); the fan assembly (3) comprises a fan (31); one end of the air guide assembly (4) is a first end surface (41) with a smaller area, and the other end is a second end surface (42) with a larger area; the first end surface (41) is arranged at the rear of the fan (31), and the second end surface (42) is arranged at the front of the rear shell (5).

2. The noise reduction structure of the PTC heater according to claim 1 is characterized in that: The first end surface (41) and the second end surface (42) of the air guide component (4) are in the shape of a circular ring.

3. The noise reduction structure of the PTC heater according to claim 2 is characterized in that: The air guide assembly (4) further comprises a side surface (43) connecting the first end surface (41) and the second end surface (42).

4. The noise reduction structure of the PTC heater according to claim 3 is characterized in that: The side surface (43) extends from the first end surface (41) to the second end surface (42) along a straight line (44).

5. The noise reduction structure of the PTC heater according to claim 3, characterized in that: The side surface (43) extends from the first end surface (41) to the second end surface (42) along an inwardly curved curve (45).

6. The noise reduction structure of the PTC heater according to claim 4 or 5, characterized in that: The inner surface (431) of the side surface (43) is provided with guide vanes (46) arranged in a central array along the first end surface (41).

7. The noise reduction structure of the PTC heater according to claim 6, characterized in that: The guide blades (46) are inclined upward relative to the horizontal plane (33).

8. The noise reduction structure of the PTC heater according to claim 1, characterized in that: The air inlet (51) is circular.

9. The noise reduction structure of the PTC heater according to claim 8, characterized in that: The air inlet (51) is provided with grille bars (52) arranged along a central array.

10. The noise reduction structure of the PTC heater according to claim 9, characterized in that: The grid bars (52) are bent in the direction of rotation (32) of the fan.

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