Patent Description:
When widths of respective segments along a length direction of a heating element are equivalent, after the heating element is inserted into a cigarette in a sleeve, tobaccos are subjected to a large extrusion from an utmost front end of the heating element, and tobaccos at two sides of a width of the heating element also accumulate densely to easily cause residual smoke soot.

In addition, when a root of the heating element has a relatively smaller width, and strength of the entire structure is relatively low, the circumstance of fracture also occurs during inserting and pulling.

Publication <CIT> discloses a heating plate for a low-temperature baking cigarette, comprising a first plate portion and a second plate portion connected with the frist plate portion, wherein the first plate portion comprises a body portion and a plurality of longitudinal fins arranged on the body portion. Publication <CIT> discloses a heating plate for a low-temperature baking cigarette, on which a plurality of heating resistances are printed. Publication <CIT> discloses a heating member for an aerosol delivery device.

The technical problem to be solved by the utility model is to provide an improved baked smoking set. This problem is solved by a baked smoking set having the features of claim <NUM>.

The utility model provides a heating element of a baked smoking set, and the heating element is in a sheet shape, and comprises a first end and a second end opposite to the first end;
the first end is configured to be inserted into a sleeve of a baked smoking set, and a width from the first end to the second end becomes wider gradually.

Preferably, an end portion of the first end is provided with a sharp head that facilitates inserting into a cigarette of the sleeve.

Preferably, an angle between two opposite sides in a width direction of the sharp head is greater than an angle between two opposite sides in a width direction of the second end of the heating element.

Preferably, the two opposite sides of a width of the heating element are provided with a blade portion respectively, so that a thickness of the heating element gradually decreases towards an edge in the width direction.

Preferably, the heating element comprises a first side and a second side opposite to the first side in a width direction, and a first surface and a second surface opposite to the first surface in a thickness direction;
the blade portion comprises a chamfer on an edge of the first surface and/or the second surface adjacent to the first side, and a chamfer on an edge of the first surface and/or the second surface adjacent to the second side; each chamfer is a bevel or a fillet.

Preferably, the edges of the first surface and the second surface adjacent to the first side are respectively provided with the chamfer, and the edges of the first surface and the second surface adjacent to the second side are respectively provided with the chamfer; the blade portions of the first side and the second side transform the first side and the second side of the heating element to rounded edges or sharp edges; or
the edge of the first surface or the second surface adjacent to the first side is provided with the chamfer, and the edge of the first surface or the second surface adjacent to the second side is provided with the chamfer, to transform the first side and the second side to sharp edges.

Preferably, the heating element comprises a sheet-shaped substrate, an insulating layer covered on the sheet-shaped substrate, and a conductive path disposed on the insulating layer, and the conductive path generates heat after being powered.

Preferably, the sheet-shaped substrate is made of a metallic or an alloy material, and the blade portion is formed by punching.

Preferably, the heating element further comprises an isolation layer covered outside the conductive path, the isolation layer is a glaze layer formed by sintering a glass glaze, and an outer surface of the heating element is covered by the isolation layer.

The utility model further provides a baked smoking set, comprising a sleeve and the heating element, wherein the heating element can be detachably inserted into the sleeve by the first end.

Implementing the baked smoking set and the heating element of the utility model has the following advantageous effects: the heating element is in a sword shape, and the first end is narrow, so that a resistant force is relatively small when the heating element is inserted, to facilitate insertion, and accumulation of tobaccos on sides of the heating element also can be effectively reduced. A bottom of the heating element becomes wider to facilitate increasing strength of the heating element, and prevent fracture of the heating element due to inserting and pulling the cigarette several times.

Hereinafter, the utility model is further described with reference to accompanying drawings and embodiments. In the drawings:.

To clearly understand technical features, objects and effects of the utility model, now detailed embodiments of the utility model are explicitly explained with reference to the accompanying drawings.

As shown in <FIG>, a baked smoking set in one preferable embodiment of the utility model comprises a tubular sleeve <NUM>, and a heating assembly <NUM> comprising a heating element <NUM>, a leading wire <NUM> and a mounting base <NUM>.

Referring to <FIG>, the heating element <NUM> is in a sheet shape, and is detachably inserted into the sleeve <NUM>. The heating element <NUM> comprises a first end A and a second end B opposite to the first end A in a length direction, and the first end A is configured to be inserted into the sleeve <NUM> of the baked smoking set.

The heating element <NUM> comprises a first side C and a second side D opposite to the first side C in a width direction, and the first side C and the second side D are provided with a blade portion <NUM> respectively that allows a thickness of the heating element <NUM> to gradually decrease towards an edge in the width direction. A central line of the heating element <NUM> is coaxial with a center of the sleeve <NUM>, and distances from the two opposite sides in the width direction of the heating element <NUM> to an inner wall surface of the sleeve <NUM> respectively are equivalent.

Since the two sides of the heating element <NUM> become thinner gradually, when the heating element <NUM> is inserted into a cigarette <NUM> received in the sleeve <NUM>, pressures of the two sides of the heating element <NUM> on tobaccos can be reduced, and tobaccos proximal to the two sides corresponding to the blade portions <NUM> may not be subjected to large extrusion or compression, thereby relieving the pressures on tobaccos proximal to the two sides, and improving atomizing efficiency of tobaccos. The blade portions <NUM> also can represent a smooth transition, to prevent tobaccos from sticking on the two sides of the heating element <NUM>.

The heating element <NUM> comprises a first surface E and a second surface F opposite to the first surface E in a thickness direction, and the blade portions <NUM> comprises chamfers on edges of the first surface E and the second surface F adjacent to the first side C, and chamfers on the edges of the first surface E and the second surface F adjacent to the second side D.

Each chamfer can be a bevel or a fillet. The edges of the first surface E and the second surface F adjacent to the first side C are respectively provided with the chamfer, and the edges of the first surface E and the second surface F adjacent to the second side D are respectively provided with the chamfer, and the blade portions <NUM> of the first side C and the second side D transform the first side C and the second side D of the heating element <NUM> to rounded edges or sharp edges.

In other embodiments, the blade portions <NUM> may comprise a chamfer only on the edge of the first surface E or the second surface F adjacent to the first side C, and a chamfer only on the edge of the first surface E or the second surface F adjacent to the second side D, to transform the first side C and the second side D to sharp edges, so as to facilitate once punch forming.

Smooth transition, or smooth polishing, or coating a glaze layer of the blade portions <NUM> on two opposite sides can effectively prevent sticking of tobaccos on the sides, and relieve accumulation of tobaccos.

As shown in <FIG>, the heating element <NUM> comprises a sheet-shaped substrate <NUM> made of a metallic material, an insulating layer <NUM> covered on the sheet-shaped substrate <NUM>, and a conductive path <NUM> disposed outside the insulating layer <NUM>. The leading wire <NUM> is connected to the conductive path <NUM>, and the leading wire <NUM> is led outwardly. The conductive path <NUM> can be supplied with power through the leading wire <NUM>, so that the conductive path <NUM> generates heat to atomize tobaccos.

Preferably, the heating element <NUM> is made of a metallic or an alloy material, and the sheet-shaped substrate <NUM> may use metallic materials, such as stainless steel or titanium alloy, preferably stainless steel, such as <NUM> and <NUM> stainless steel. A thickness of the sheet-shaped substrate <NUM> is generally <NUM> to <NUM>, and the sheet-shaped substrate <NUM> is formed by punch forming or wire cutting, which is low in cost. The blade portions <NUM> on the sheet-shaped substrate <NUM> made of a metallic material can be formed by punching to further save cost. Dimensions of length, width and the like of the heating element <NUM> are fitted with diameter and length of the cigarette, which facilitates sufficient heating of tobaccos.

The sheet-shaped substrate <NUM> made of a metallic material, as a main body of the heating element <NUM>, has a high toughness, so that fracture of the heating element <NUM> can be effectively prevented under long-term high temperature and mechanical shock, such as, cigarette loading, and the like. Meanwhile, the sheet-shaped substrate <NUM> made of a metallic material has a good thermal conductive performance, which ensures uniformity of a surface temperature of the heating element <NUM>, and facilitates heating the non-combustible cigarette to obtain an optimized taste.

Referring to <FIG> and <FIG>, according to steady state simulation experiments, in the same temperature fields, the area exceeding <NUM> degrees Celsius around the heating element <NUM> made of stainless steel is larger than that around the heating element <NUM> made of ceramic such as zirconium oxide and the like, so the atomizing efficiency of the heating element <NUM> made of stainless steel is higher, and taste is better.

Preferably, the first end A of the sheet-shaped substrate <NUM> is provided with a sharp head <NUM> that facilitates inserting into a cigarette <NUM>. The sharp head <NUM> can guide insertion of the heating element <NUM>, and reduce a resistant force when inserting.

In order to satisfy process requirements for printing the conductive path <NUM> onto the sheet-shaped substrate <NUM>, the sheet-shaped substrate <NUM> comprises a flat surface <NUM> between the blade portions <NUM> on the two opposite sides of the heating element <NUM>, and the conductive path <NUM> is printed in an area of the flat surface <NUM>. The blade portions <NUM> are disposed outwardly by two opposite sides in a width direction of the flat surface <NUM>.

The insulating layer <NUM> is formed by sintering at <NUM> to <NUM> after a surface of the sheet-shaped substrate <NUM> is covered by a glass slurry containing silicon oxide, calcium oxide, and aluminum oxide, and since the sheet-shaped substrate <NUM> made of a metallic or an alloy material is conductive, the insulating layer <NUM> can prevent a short circuit between the sheet-shaped substrate <NUM> and the conductive path <NUM>.

The insulating layer <NUM> is covered on the sheet-shaped substrate <NUM> by the way of spraying or printing, and a thickness of the insulating layer <NUM> can be designed according to pressure resistance requirements between the conductive path <NUM> and the sheet-shaped substrate <NUM>. Generally, the insulating layer <NUM> has a thickness less than <NUM>.

In order to prevent oxidation of the sheet-shaped substrate <NUM> made of a metallic material during use in a high temperature, preferably, two sides of the sheet-shaped substrate <NUM> are covered with the insulating layer <NUM>. The conductive path <NUM> is located on one side of the insulating layer <NUM>. The insulating layer <NUM> also can be provided only on one side of the sheet-shaped substrate <NUM> which the conductive path <NUM> is disposed, and when the heating element <NUM> is made of a non-metallic and non-conductive material, the insulating layer <NUM> also can be removed.

The conductive path <NUM>, as a resistance heater, can be a conductive layer formed on the insulating layer <NUM> in a manner of such as physical vapor deposition, or electroplating, or printing.

Preferably, the conductive path <NUM> comprises a heating resistor <NUM>, and an electrical connection portion electrically connected to the heating resistor <NUM>. The heating resistor <NUM> and the electrical connection portion are arranged along a length direction of the sheet-shaped substrate <NUM>, and conductive electrodes <NUM> are connected to an external circuit. Preferably, the electrical connection portion comprises two conductive electrodes <NUM> electrically connected to the heating resistor <NUM>.

The leading wire <NUM> are connected to the conductive electrode <NUM>, and is led out from one end away from the heating resistor <NUM> along a length direction of the heating element <NUM>, i.e., the heating resistor <NUM> and the conductive electrodes <NUM> are arranged in a direction from the first end A to the second end B, and the leading wires <NUM> are led outwardly from the second end B.

The heating resistor <NUM> can be formed by sintering after printing with any one of silver-palladium resistance slurry, ruthenium-palladium resistance slurry, platinum slurry and nickel-based slurry. The heating resistor <NUM> can be flexibly patterned, and an appropriate resistance value desired for the heating element <NUM> is obtained in cooperation with the slurry properties and a thickness of the heating resistor <NUM>. The resistance value of the heating element <NUM> is usually between <NUM> to <NUM>Ω, and the thickness of the heating resistor <NUM> is usually less than <NUM>, preferably, less than <NUM>. The conductive electrode <NUM> is formed by sintering after printing with silver-based slurry having a relatively low resistivity.

When the leading wire <NUM> is connected to an external power supply, the heating resistor <NUM> can be powered to generate heat, and the leading wire <NUM> can be connected to the conductive electrodes <NUM> by the way of high temperature brazing with silver-copper solder, or pure silver solder, or nickel solder under a protective atmosphere of <NUM> to <NUM>. The leading wire <NUM> is connected to the conductive electrode <NUM> by the way of tin welding with a high-temperature welding paste, and a use temperature is greater than <NUM>.

Since the sheet-shaped substrate <NUM> made of a metallic material has a good conductivity, in order to prevent energy loss, through holes <NUM> are provided in a section of a length direction of the sheet-shaped substrate <NUM> where the conductive electrode <NUM> is located. The through holes <NUM> can isolate heat, and reduce heat delivered to the second end B.

Since the section corresponding to the conductive electrode <NUM> has a relatively low temperature, tobaccos cannot be sufficiently atomized, and tobacco shreds can store and absorb a certain amount of tobacco tar, so the tobacco tar can be prevented or reduced from leakage.

A great temperature gradient exists between the section of the heating element <NUM> corresponding to the heating resistor <NUM> for inserting into tobaccos and that corresponding to the conductive electrodes <NUM>, and the section corresponding to the conductive electrode <NUM> has a relatively low temperature and small heat dissipation, which facilitates effective use of energy.

In order to isolate the heating resistor <NUM> from outside air, and further extend service life and stability thereof, the heating element <NUM> further comprises an isolation layer <NUM> covered outside the conductive path <NUM>.

The isolation layer <NUM> is a glaze layer formed by sintering a glass glaze, and a thickness is usually less than <NUM> thereof. Two sides of the sheet-shaped substrate <NUM> are covered by the isolation layer <NUM> respectively. The glaze layer allows a surface of the heating element to be smooth, and has a small roughness to reduce adhesion of smoke stains and smoke tar after baking of tobaccos, and facilitate scrubbing. In other embodiments, the isolation layer <NUM> also can be covered only on one side where the conductive path <NUM> is located.

Preferably, as shown in <FIG>, in order to facilitate inserting the heating element <NUM> into the cigarette <NUM>, a width of the heating element <NUM> from the first end A to the second end B gradually increases, so the heating element <NUM> is in a sword shape; the first end A is narrow, combining with a thinning structure of the blade portion <NUM>, so that a resistant force is relatively small when the heating element <NUM> is inserted, to facilitate insertion, and accumulation of tobaccos on sides of the heating element also can be effectively reduced. A bottom of the heating element becomes wider to facilitate increasing strength of the heating element, and prevent fracture of the heating element due to inserting and pulling the cigarette several times.

Generally, an angle between the two opposite sides in a width direction of the sharp head <NUM> is greater than an angle between the two opposite sides in a width direction of the second end B of the heating element <NUM>. In other embodiments, the heating element <NUM> also can be a triangle.

Referring to <FIG> again, the mounting base <NUM> is sleeved on the second end B of the heating element <NUM>, i.e., sleeved on the end led out of the leading wires <NUM> of the heating element <NUM>, and sleeved onto the electrical connection portion. In other embodiments, the mounting base <NUM> also can be an individual component, which is separately mounted on the heating element <NUM>.

The sharp head <NUM> is located on one end of the heating element <NUM> away from the mounting base <NUM>, and the mounting base <NUM> and the sharp head <NUM> are respectively located on two opposite ends of the heating element <NUM>. After one end of the sharp head <NUM> of the heating element <NUM> is inserted into the sleeve <NUM>, the mounting base <NUM> abuts against an outer end of the sleeve <NUM>, to define an insertion depth of the heating element <NUM>.

Since through holes <NUM> are provided in the section of a length direction of the sheet-shaped substrate <NUM> where the conductive electrode <NUM> is located, transmission of heat to the second end B is reduced, and excess temperature of the mounting base <NUM> also can be prevented.

Since a heating zone is not disposed between an end portion of the second end B where the mounting base <NUM> is located and the conductive electrodes <NUM>, possibility of producing noxious gas is reduced, and a range of selecting materials of the mounting base <NUM> is extensive to reduce cost. Generally, the mounting base is formed by injection molding using high-molecular polymer, and the commonly used material is polyether-etherketone, high-temperature nylon and the like.

It shall be understood that the above respective technical features can be combined optionally for use without limitation.

Claim 1:
A baked smoking set, comprising a sleeve (<NUM>), a heating element (<NUM>) and a mounting base (<NUM>),
wherein the heating element (<NUM>) is in a sheet shape, and comprises a first end (A) and a second end (B) opposite to the first end (A) in a length direction of the heating element (<NUM>);
wherein the first end (A) is configured to be detachably inserted into the sleeve (<NUM>), and
wherein the mounting base (<NUM>) is sleeved on the second end (B) of the heating element (<NUM>), characterized in that a width from the first end (A) to the second end (B) becomes wider gradually.