CN216820121U

CN216820121U - Heater frame plate, heater module and blower

Info

Publication number: CN216820121U
Application number: CN202121813940.4U
Authority: CN
Inventors: 彭骏宇
Original assignee: Koninklijke Philips NV
Current assignee: Koninklijke Philips NV
Priority date: 2020-08-07
Filing date: 2021-08-05
Publication date: 2022-06-24
Anticipated expiration: 2031-08-05
Also published as: EP3952610A1

Abstract

Embodiments of the present disclosure relate to a heater frame plate, a heater module, and a blower. A heater frame plate has a side provided with a plurality of grooves for receiving heater wires. The plurality of channels on the side surface include a first set of channels having a first sidewall at a first angle to the central axis of the framed panel and a second set of channels having a second sidewall at a second angle to the central axis, the second angle being different from the first angle, the depth of the second set of channels exceeding the depth of the first set of channels. By such an arrangement, more heater wire windings around the heater frame are allowed to be used without requiring additional length of the heater frame. The second angle may be between 30 ° and 60 °, and preferably between 40 ° and 50 °.

Description

Heater frame plate, heater module and blower

Technical Field

The present disclosure relates to a heater frame plate, a heater module having a heater wire wound around a heater frame having the heater frame plate, and a blower having the heater.

Background

US 4,667,086 discloses a heating element for appliances such as hair dryers, paint strippers, hot air blowers and the like, consisting essentially of a tightly crimped corrugated wire ribbon supported on a template in the following manner: the corrugations of the wire bands are generally perpendicular to the surface of the form. The resulting structure is capable of efficiently radiating heat into a large volume of flowing gas. A particularly preferred embodiment is obtained when the template is a crossed mica plate.

DE 2708117 discloses a hot air generating appliance such as a hair dryer having an electric motor secured by radial ribs having slots for holding a ribbon resistor.

US 4,628,189 discloses a resistance heater having an insulator with inclined sides that are inclined inwardly toward each other forming an outer end of the insulator, with side notches in the insulator at the base of the inclined sides, and a central notch in the insulator outer end between the two inclined sides.

Blower temperature performance is determined by the air flow rate through the heater and its heater power. Assuming that the motor and fan system is fixed, it is believed that the higher the heater wattage, the higher the blower airflow temperature. However, wattage is limited either by the size of the hair dryer design or by the electrical outlet specifications. When size and wattage are limited, there are very few options to increase the temperature of the gas stream by modifying the heater. The type of winding of the heater may be varied, such as a wave heater versus a coil heater, or the shape of the heating element may be changed from a round wire shape to a flat ribbon shape. Another option to improve the temperature of the air stream is to fine tune the position of the heater wire in the radial direction, trying to capture the maximum amount of air stream to achieve the highest heat transfer efficiency. Due to safety requirements, the heater wires cannot be brought too close to each other to avoid electrical leakage.

SUMMERY OF THE UTILITY MODEL

It is an object of the present disclosure, inter alia, to provide an improved heater frame plate, heater module and hair dryer to at least partially address the above-mentioned problems in the prior art. The present disclosure is defined by the independent claims. Preferred embodiments are defined in the dependent claims.

According to embodiments of the present disclosure, one or more inclined slots are added in each section of a conventional heater wire support frame to allow the heater wire to be positioned at multiple depths with respect to the heater central axis. This is an effective way to increase both the total length of the heater wire and the heater footprint, thereby allowing higher heat transfer rates between the heater wire and the flowing air and higher air flow temperatures without increasing the total heater wattage or the total length of the heater module.

While horizontal slots having different depths are known, the addition of a relatively deep horizontal slot requires an additional length of heater wire support frame. Conversely, if angled slots are used according to the present disclosure, the length of the heater wire support frame need not be extended as if horizontal slots were added, while still having more heater wire windings around the heater wire support frame.

Unlike the existing path of repositioning the heater wire, the disclosure described herein creates new space for the heater wire to be positioned. This allows the heater wires to be lengthened to these new spaces while keeping the remaining optimized path unchanged without requiring an increase in the length of the heater assembly. At the same time, the area of the heater line that can contact the air stream is increased, thereby increasing the air stream temperature.

The disclosure described herein may also be achieved if the objective is to reduce the overall length of the heater assembly without increasing the airflow temperature by: the existing filament length is wound to a new space located towards the heater center without the need to wind along the length of the heater. The length of the entire heater assembly can be shortened while maintaining the filament length constant.

In view of the above considerations, a first aspect of the present disclosure provides a heater frame plate having a side provided with a plurality of grooves for accommodating heater wires, wherein the plurality of grooves includes a first group of grooves having a first side wall at a first angle to a central axis of the frame plate and a second group of grooves having a second side wall at a second angle to the central axis, the second angle being different from the first angle, the depth of the grooves in the second group exceeding the depth of the grooves in the first group.

Each set may include one or more slots. There may be more than two sets of slots. Typically, the first angle is about 90 °. The second group includes inclined grooves. The second angle may be between 30 ° and 60 °, and preferably between 40 ° and 50 °. In each set, the angles of the individual grooves are not necessarily exactly the same, for example due to manufacturing tolerances. The slot need not be a straight slot but may have one or more bends. The shape of at least one slot in the second set may be meandering. If the slot has one or more bends, the angle should be measured by drawing a line between an outer point in the slot at the outer boundary of the heater frame plate and an inner point at the bottom of the slot. Portions of the slots of the first set may be positioned between respective pairs of slots of the second set.

The heater module includes a plurality of such heater frame plates, and a heater wire wound around the heater frame plates. A hair dryer comprising such a heater module and a fan for blowing air along the heater.

These and other aspects of the disclosure will be apparent from and elucidated with reference to the embodiments described hereinafter.

Drawings

FIG. 1 shows a separate mica tray according to one embodiment of the present disclosure;

FIG. 2 illustrates one embodiment of an assembled heater wire support bracket;

FIG. 3 illustrates one embodiment of an assembled heater module;

FIG. 4 shows a top view of the assembled heater module of FIG. 3;

FIG. 5 shows a side view of the assembled heater module of FIG. 3;

FIG. 6 shows a separate mica bracket according to one embodiment of the present disclosure;

FIG. 7 shows a cross-sectional view of the heater assembly and shows the new space created for the heater wire;

FIG. 8 shows a side view of the heater assembly and shows a continuous heater wire wrapped from the inner zone to the outer zone; and

figure 9 illustrates a separate mica tray according to one embodiment of the present disclosure.

Detailed Description

Conventional heaters have horizontal slots for positioning the heater wire during winding. As shown in fig. 1 and 2, some embodiments of the present disclosure described herein have a second set II of single-tilt chutes added to each section of the conventional heater mica tray B. Fig. 2 shows an assembled heater wire support bracket having 3 brackets B1, B2, and B3. The inclined groove feature II allows the addition section of the heater wire W to be positioned radially deeper, i.e. at the inclined groove bottom, relative to the central axis a and not interfere with the existing outer heater wire of the inclined grooves in the first set I of inclined grooves. Although the second angle may be between 30 ° and 60 °, for example between 40 ° and 50 °, if only one set of inclined grooves is used, such as is the case in the present embodiment, the inclined grooves may actually start at the upper edge of the mica sheet and extend at a steeper angle than 30 °.

Such an embodiment allows the heater wire W to be wound in the entire heater assembly as in a conventional wire heater, but at the same time allows the wire to extend only at the front end of the heater assembly towards the central axis a without the need to add extra length of mica brackets to create extra space for an extended length of wire. Fig. 3, 4 and 5 show different views of the assembled heater module M.

More complex versions of the present disclosure can be made by adding multiple angled slots of the second and third sets II of slots in each section of the heater wire supporting mica bracket B as shown in fig. 6. The slots create new spaces at the bottom of the inclined slots in the second and third sets II, III of slots for the placement of heater wires W, as shown in fig. 7, which shows a heater module according to one embodiment comprising 3 trays B1, B2, and B3, each tray having a plurality of inclined slots II, III. The coil type heater is used to illustrate the concept in the drawings, but the present disclosure is not limited to only the coil type wire heater.

Fig. 8 shows how the inclined grooves II, III allow the heater wire W to be continuously wound from the inner layer to the outer layer without any interference. When higher air flow temperatures or shorter tray lengths are desired, more angled slots may be added to the heater wire support tray.

Figure 9 illustrates a separate mica tray according to one embodiment of the present disclosure. In contrast to the embodiments shown in fig. 1, 3, 5, 6, in the embodiments shown in fig. 2, 7, 8, 9, the sharp corners C on the edges of the mica sheets are rounded so that during assembly of the heater module M to the blower inner housing, the mica sheet corners are not easily damaged and a slightly larger gap is created to facilitate assembly into place. In the embodiment of fig. 9, the inclined grooves II have a meandering shape to prevent the wire W from jumping out when subjected to an impact. The depth of the horizontal grooves in the first set of I-grooves is reduced to reduce the stress on the mica plate during impact, which is shown in the figure by the dashed lines. The spacing of the horizontal grooves in the first group I of grooves was set to 7.5mm to provide more heat around the inclined grooves II to improve reliability during impact. Fig. 9 also shows how the angle of the non-straight slot is determined, i.e. a line AL is drawn through the inner point at the bottom of the slot and the outer point in the slot at the outer boundary of the frame plate.

The heater wire mounting bracket is typically constructed using mica sheets. Horizontal and inclined grooves may be alternately added at the edges of the mica sheet to form seating spaces at different depths for seating heater wires throughout the length of the heater assembly. Starting from the grooves with the greatest depth, heater wire may be wrapped around the heater and continuously around these grooves along the length of the heater. This winding method can prevent the heater wires from interfering with each other. The spacing and angle of the slots may be designed to provide sufficient clearance between the heater wires to avoid leakage.

The present disclosure may be applied to any blower that uses a heater wire as a heater design. Such a blower includes a heater module M as shown in fig. 3, 4, 5, 7 or 8, and a fan for blowing air along the heater module M.

It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of other elements or steps than those listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements. In the device claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The measures recited in mutually different dependent claims may advantageously be used in combination.

Claims

1. A heater frame plate having a side provided with a plurality of channels for receiving heater wires, wherein the plurality of channels on the side include a first set of channels having a first sidewall at a first angle to a central axis of the heater frame plate and a second set of channels having a second sidewall at a second angle to the central axis, the second angle being different from the first angle, the depth of the second set of channels exceeding the depth of the first set of channels.

2. The heater frame plate of claim 1, wherein the second angle is between 30 ° and 60 °.

3. The heater frame plate of claim 1, wherein the second angle is between 40 ° and 50 °.

4. The heater frame plate of any of claims 1-3, wherein at least one channel of the second set of channels is serpentine in shape.

5. The heater frame plate of any of claims 1-3, wherein portions of the first set of channels are positioned between respective pairs of channels in the second set of channels.

6. A heater module comprising a plurality of heater frame plates according to any one of claims 1-5 and a heater wire wrapped around the heater frame plates.

7. A hair dryer comprising a heater module as claimed in claim 6 and a fan for blowing air along the heater.