Patent Application
20230276540
The present disclosure relates to the field of electric appliance technologies, and more particularly, to a heating sheet, a heating tube, and an electric appliance.
Since a heating tube is a core component of kitchen appliances such as electric ovens for baking and cooking, heating efficiency, response speed, and impulse current of the heating tube have become important indicators to measure performance of kitchen appliances. Conventional heating tubes have problems such as dispersed heating and slow response speed due to slow thermal conductivity of heating materials and low energy utilization of heating modes.
Therefore, conventional heating sheets, heating tubes, and electric appliances need to be improved.
The present disclosure is based on discovery of the following problems.
For a heating tube in a linear heating mode, radiation heat transfer is directed in a radial direction of the heating tube, resulting in problems such as dispersed heating and low energy utilization. In addition, it takes a conventional heating tube few tens of seconds or even longer to heat its surface to a highest temperature, which is a slow response speed. In addition, resistivity of heating wires of the heating tube changes with an increase in temperature, during which process a relatively high impulse current would be generated. A graphite heating tube was discovered to have characteristics of high heating efficiency, fast response speed, and low impulse current. However, a graphite sheet, which is quite brittle, is prone to fractures when subjected to mechanical shocks. During assembly of the heating tube in a conventional electric oven, the heating tube is in rigid contact with a wall surface the electric oven. When the electric oven is dropped, the heating tube is subjected to a stress transferred from the wall surface of the electric oven, resulting in a fracture of a heating sheet in a light-emitting tube.
The present disclosure aims to alleviate or solve at least one of the above problems to some extent.
In one embodiment of the present disclosure, a heating sheet is provided. The heating sheet includes a graphite sheet substrate. The graphite sheet substrate includes a buffer region and a heating region. The buffer region is located at two ends of the graphite sheet substrate. The heating region is connected to the buffer region and located on a side of the buffer region facing away from the two ends. The heating region includes a hollow zone. A duty ratio of the buffer region is greater than a duty ratio of the heating region. Thus, the heating sheet has advantages of good impact resistance and strong anti-fracture performance.
It should be noted that in the present disclosure, the term “duty ratio” is a ratio of an area of a part containing the graphite sheet substrate to a total area (a sum of the area of the part containing the graphite sheet substrate and an area of the hollow parts) of the graphite sheet substrate in this part in a predetermined region (e.g., the buffer region, the heating region). That is, an increase in the hollow parts leads to a decrease in the duty ratio. In a further embodiment, a total area of the graphite sheet substrate in the predetermined region may be an area of a zone enclosed by a connecting line along edges of the graphite sheet substrate extending in a second direction in this region.
Further, a length of each buffer region in an extending direction of the graphite sheet substrate ranges from 5 mm to 60 mm.
Further, the buffer region includes at least one of a first buffer region and a second buffer region. The first buffer region has a duty ratio of 1. The second buffer region has a duty ratio smaller than 1. The duty ratio of the second buffer region is greater than the duty ratio of the heating region.
Further, notches are defined in the second buffer region. Each of the notches extend from a side of the graphite sheet substrate towards a center of the graphite sheet substrate in an extending direction perpendicular to the extending direction of the graphite sheet substrate.
Each of the notches extend from an outer surface of the graphite sheet substrate towards the center of the graphite sheet substrate.
Further, the heating region includes heating units. Each of the heating units include a first portion, a second portion, a third portion, and a fourth portion that are connected end to end sequentially. The first portion and the third portion extend in a first direction, and the second portion and the fourth portion extend in a second direction. The first direction intersects with the second direction. The second direction is the extending direction of the graphite sheet substrate. The first direction is perpendicular to the second direction.
Further, a maximum dimension of the first portion and the second portion in the first direction is greater than a maximum depth of the notches. At least one of spacings between the notches is greater than a maximum dimension of the third portion and the fourth portion in the second direction. Each of the spacings between the notches is a distance between two adjacent notches, located on a same edge, of the notches.
A depth of each of the notches refers to a depth of the notch in the first direction. The disclosure “a maximum dimension of the first portion and the second portion in the first direction is greater than a maximum depth of the notches” means that a maximum value between a dimension in the first direction of the first portion in the heating region and a dimension in the first direction of the second portion in the heating region is greater than a maximum value of depths in the first direction of the notches in the second buffer region.
Each of the spacings between the notches is a distance between two adjacent notches, located on a same surface of the graphite sheet substrate, of the notches.
Similarly, for the notches defined in the second buffer region, distances between two adjacent notches located on a same surface of the graphite sheet substrate may be the same as or different from each other. The disclosure “at least one of spacings between the notches is greater than a maximum dimension of the third portion and the fourth portion in the second direction” means that at least one of the spacings between the notches is greater than a maximum value between a dimension of the third portion in the second direction and a dimension of the fourth portion in the second direction.
According to embodiments of the present disclosure, a maximum dimension between the first portion and the third portion in the first direction is greater than a maximum depth of the notches. At least one of spacings between the notches is greater than a maximum dimension between the second portion and the fourth portion in the second direction. Each of the spacings between the notches is a distance between two adjacent notches, located on a same edge, of the notches.
The disclosure “a maximum dimension of the first portion and the third portion in the first direction is greater than a maximum depth of the notches” means that a maximum value between a dimension of the first portion in the first direction and a dimension of the third portion in the first direction is greater than a maximum value of depths of the notches in the first direction.
The disclosure “at least one of spacings between the notches is greater than a maximum dimension of the second portion and the fourth portion in the second direction” means that at least one of the spacings between the notches is greater than a maximum value between a dimension of the second portion in the second direction and a dimension of the fourth portion in the second direction.
The heating region includes heating units. Each of the heating units includes a first portion, a second portion, a third portion, and a fourth portion, and has a recess. As can be seen from the above description, a maximum value of depths of the recesses in the heating units in the first direction is greater than a maximum value of depths of the notches in the second buffer region in the first direction.
Further, a length of each of the first buffer region and the second buffer region in the extending direction of the graphite sheet substrate ranges from 5 mm to 30 mm.
Further, the length of the second buffer region is smaller than the length of the first buffer region.
Further, the heating sheet satisfies at least one of the conditions: each of two buffer regions located at the two ends of the graphite sheet substrate is formed by the first buffer region or by the second buffer region; each of the two buffer regions located at the two ends of the graphite sheet substrate includes one first buffer region and one second buffer region; or one of the two buffer regions located at the two ends of the graphite sheet substrate is formed by one first buffer region, and the other one of the two buffer regions located at the two ends of the graphite sheet substrate is formed by one second buffer region.
In another embodiment of the present disclosure, a heating tube is provided. The heating tube includes the heating sheet as described above, an outer tube, a lead wire, and a connection terminal. The heating sheet is disposed in the outer tube. The heating sheet is connected to the connection terminal by the lead wire. As a result, the heating tube has all the features and advantages of the heating sheet described above, and thus details thereof will be omitted. In general, the heating tube has advantages such as fast response speed, high heating efficiency, and low impulse current.
In another embodiment of the present disclosure, an electric appliance is provided. The electric appliance includes the heating tube as described above. As a result, the electric appliance has all the features and advantages of the heating tube described above, and thus details thereof will be omitted. In general, the electric appliance has advantages such as satisfying heating performance and good impact resistance.
Further, the electric appliance includes an electric oven, a microwave oven, or a steam oven.
The above and/or additional embodiments of the present disclosure will become more apparent and more understandable from the following description of embodiments in conjunction with the accompanying drawings.
Reference numerals of the accompanying drawings:
Embodiments of the present disclosure will be described in detail below with reference to examples thereof as illustrated in the accompanying drawings, throughout which same or similar elements, or elements having same or similar functions, are denoted by same or similar reference numerals. The embodiments described below with reference to the drawings are illustrative only, and are intended to explain, rather than limiting, the present disclosure.
In one embodiment of the present disclosure, a heating sheet is provided. The heating sheet includes a graphite sheet substrate. Referring to
In the present disclosure, the term “duty ratio” is a ratio of an area of a part containing the graphite sheet substrate to a total area (a sum of the area of the part containing the graphite sheet substrate and an area of the hollow parts) of the graphite sheet substrate in this part in a predetermined region (e.g., the buffer region, the heating region). That is, an increase in the hollow parts leads to a decrease in the duty ratio. In a further embodiment, a total area of the graphite sheet substrate in the predetermined region may be an area of a zone enclosed by a connecting line along edges of the graphite sheet substrate extending in a second direction in this region.
For ease of understanding, a brief explanation of the principle by which the heating sheet can achieve the advantageous effects described above will be described below.
Taking an electric oven including a heating tube as an example, with reference to
where q represents the load transferred from the wall surface of the electric oven to which the heating tube is subjected when the electric oven is dropped, and/represents a total length of the heating tube. Referring to
and a middle position of the heating tube, i.e., a position where distances x from the two ends of the heating tube is
is subjected to a force of 0. Referring to
In the present disclosure, since the heating region has a hollow structure, it is conceivable that a graphite structure in the heating region is partially hollow and occupied by “blanks”.
According to some embodiments of the present disclosure, the buffer region is used to improve impact and fracture resistance of the heating sheet. A length of the buffer region is not limited herein. For example, a length of the buffer region in an extending direction of the graphite sheet substrate may range from 5 mm to 60 mm. When the length of the buffer region is smaller than 5 mm, the length of the buffer region is too short to effectively improve the impact resistance of the heating sheet. When the length of the buffer region is greater than 60 mm, the graphite sheet substrate is commonly in a form of a large continuous area due to a high duty ratio of the buffer region, and thus provides poor heating performance. When the length of the buffer region is too long, the entire heating sheet has poor heating performance, which cannot satisfy daily use requirements of the heating tube.
According to some embodiments of the present disclosure, referring to
According to some embodiments of the present disclosure, the buffer region of the heating sheet is not limited in structure. The buffer region may include at least one of a first buffer region or the second buffer region. In some embodiments, referring to
According to some embodiments of the present disclosure, distributions of the first buffer region 121 and the second buffer region 122 on the graphite sheet substrate 100 are not limited herein. For example, both two buffer regions 120 at two ends of the graphite sheet substrate 100 may be formed by the first buffer region 121 or by the second buffer region 122. That is, both the two buffer regions 120 at two ends of the graphite sheet substrate 100 may be the first buffer regions 121 or the second buffer regions 122. For example, one of the two buffer regions 120 at two ends of the graphite sheet substrate 100 may be formed by one first buffer region 121, and the other may be formed by one second buffer region 122.
According to some embodiments of the present disclosure, referring to
According to some embodiments of the present disclosure, referring to
According to some embodiments of the present disclosure, the second buffer region 122 may have notches. Each of the notches extends from a side of the graphite sheet substrate 100 towards a center of the graphite sheet substrate 100 in an extending direction perpendicular to the extending direction of the graphite sheet substrate 100. When the second buffer region 122 has the above-mentioned structure, the second buffer region 122 can provide good impact resistance for a reason that the second buffer region 122 is partially wider than the heating region 110. Due to its bending structure, the second buffer region 122 can provide good heating performance.
The heating region 110 includes heating units 10 connected in series or in parallel. The heating units 10 connected in series will be described below as an example.
According to some embodiments of the present disclosure, referring to
According to some embodiments of the present disclosure, the first portion 11, the second portion 12, the third portion 13, and the fourth portion 14 are not limited in dimension. For example, a maximum dimension of the first portion 11 and the second portion 12 in the first direction may be greater than a maximum depth of the plurality of notches; at least one of spacings between the notches is greater than a maximum dimension of the third portion 13 and the fourth portion 14 in the second direction; and each of the spacings between the notches is a distance between two adjacent notches, located on a same edge, of the notches.
According to embodiments of the present disclosure, the description “a maximum dimension of the first portion 11 and the second portion 12 in the first direction” means a maximum value between a dimension of the first portion 11 in the first direction and a dimension of the second portion 12 in the first direction.
The description “a maximum dimension of the third portion 13 and the fourth portion 14 in the second direction” means a maximum value between a dimension of the third portion 13 in the second direction and a dimension of the fourth portion 14 in the second direction.
According to some embodiments of the present disclosure, referring to
The description “a maximum dimension of the first portion 11 and the third portion 13 in the first direction” means a maximum value between a dimension of the first portion 11 in the first direction and a dimension of the third portion 13 in the first direction.
Similarly, referring to
According to some embodiments of the present disclosure, when only the first buffer region 121 is arranged at the two ends of the heating region 110, the first buffer region 121 is not limited in length. For example, the length of the first buffer region 121 in the extending direction of the graphite sheet substrate 100 may range from 5 mm to 60 mm. When the length of the first buffer region 121 falls within the above range, the buffer region 120 cannot only provide good impact resistance, but also mitigate an effect of the arrangement of the buffer region 120 on the heating performance of the heating sheet.
According to some embodiments of the present disclosure, when only the second buffer region 122 is arranged at the two ends of the heating region 110, the second buffer region 122 is not limited in length. For example, the length of the second buffer region 122 in the extending direction of the graphite sheet substrate 100 may range from 5 mm to 60 mm When the length of the second buffer region 122 falls within the above range, the buffer region 120 cannot only provide good impact resistance, but also mitigate an effect of setting of the buffer region 120 on the heating performance of the heating sheet.
According to some embodiments of the present disclosure, when the first buffer region 121 and the second buffer region 122 are arranged at the two ends of the heating region 110, respectively, the first buffer region 121 and the second buffer region 122 are not limited in length. For example, the length of each of the first buffer region 121 and the second buffer region 122 in the extending direction of the graphite sheet substrate 100 may range from 5 mm to 30 mm. In some embodiments, the length of the first buffer region 121 may be 20 mm, and the length of the second buffer region 122 may be 15 mm. When the length of the first buffer region 121 and the length of the second buffer region 122 fall within the above range, the buffer region 120 cannot only provide good impact resistance, but also mitigate an effect of the arrangement of the buffer region 120 on the heating performance of the heating sheet.
According to some embodiments of the present disclosure, a relationship between the length of the first buffer region 121 and the length of the second buffer region 122 is not limited. For example, the length of the second buffer region 122 may be smaller than the length of the first buffer region 121. In this way, the impact resistance of the heating sheet can be further improved.
In another embodiment of the present disclosure, referring to
In another embodiment of the present disclosure, an electric appliance is provided. The electric appliance includes the heating tube as described above. As a result, the electric appliance has all the features and advantages of the heating tube described above, and thus details thereof will be omitted herein. In general, the electric appliance has advantages such as satisfying heating performance and good impact resistance.
According to some embodiments of the present disclosure, types of the electric appliance are not limited. For example, the electric appliance may be an electric oven, a microwave oven, or a steam oven.
In the description of the present disclosure, the orientation or position relationship indicated by terms “upper”, “lower”, etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present disclosure, rather than requiring that the present disclosure must be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. In the description of the present disclosure, descriptions with reference to terms “one embodiment”, “another embodiment”, etc., mean that specific features, structure, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, the different embodiments or examples and the features of the different embodiments or examples described in this specification may be combined without contradicting each other. Further, it should be noted that in this specification, the terms “first” and “second” are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated embodiments.
Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present disclosure. Changes, modifications, substitutions, and modifications to the above-mentioned embodiments may be within the scope of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202011197840.3 | Oct 2020 | CN | national |
| 202022484974.5 | Oct 2020 | CN | national |
The present disclosure is a national phase application of International Application No. PCT/CN2021/124473, filed on Oct. 18, 2021, which claims priorities to Chinese Patent Application No. 202011197840.3 and No. 202022484974.5, filed in the Chinese Patent Office on Oct. 30, 2020, the entireties of which are herein incorporated by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2021/124473 | 10/18/2021 | WO |
