CN211632870U

CN211632870U - Heating tube capable of heating uniformly and cooking utensil

Info

Publication number: CN211632870U
Application number: CN202020028623.0U
Authority: CN
Inventors: 朱泽春; 魏云杰; 刘远; 吴超
Original assignee: Hangzhou Joyoung Household Electrical Appliances Co Ltd
Current assignee: Hangzhou Jiuchuang Home Appliances Co ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2020-10-09
Anticipated expiration: 2030-01-07

Abstract

The utility model relates to a heating tube with uniform heating, including container, the flaky heat-generating body of suspension in the container, wear out the power supply portion at container both ends, power supply portion is connected at the both ends of heat-generating body, and the heat-generating body includes first heat-generating portion, and first heat-generating portion includes broad width portion and narrow vice portion, and broad width portion sets up with narrow vice portion in turn on the length direction of heat-generating body, the intermediate position of broad width portion is equipped with the joint-cutting, minimum distance between the tip of joint-cutting and the tip of broad width portion is greater than minimum distance between the lateral part of joint-cutting and the lateral part of broad width portion. The utility model provides a technical scheme need not to set for the direction of installation of heating tube in the culinary art chamber to can guarantee cooking utensil's the unanimity of culinary art performance, and improve the installation effectiveness of heating tube.

Description

Heating tube capable of heating uniformly and cooking utensil

Technical Field

The utility model relates to a kitchen utensil field particularly, relates to an even heating tube of heating and cooking utensil.

Background

Patent CN101861758A discloses a heat generating tube, which is composed of a heat-resistant glass tube, a heat generating body and a power supply part, wherein the heat generating body is a thin film sheet made of a material containing a carbon-based substance, has two-dimensional isotropic heat conductivity in the plane direction, and can rapidly heat up and efficiently generate heat overall when energized. Therefore, the heating tube is gradually applied to the cooking utensil to replace the existing heating tube with slow heating temperature rise, and further the cooking efficiency of the cooking utensil is improved.

As shown in fig. 1, the heating element has a sheet-like structure and two-dimensional isotropic thermal conductivity in the plane direction, so that the amount of heat radiation from each point on the surface of the heating element is the same, but the heating element is installed in the glass tube, the distances from each point on the surface of the heating element to the inner wall of the glass tube are not equal, so that the amount of heat radiated from each point on the surface to the same point on the wall of the glass tube is different, and the total amount of heat at a certain point on the wall of the glass tube is the sum of the amounts of heat radiated from each point on the surface of the heating element to the point, so that the temperature of the region of the wall of the glass tube near the heating element is higher than the temperature of the region far from the heating element. If the installation direction of the heating tube in the cooking cavity is not determined, the cooking appliance cooks the same food materials under the same process conditions, so that the cooking effect and the cooking efficiency have great difference, and the consistency of the cooking performance of the cooking appliance cannot be ensured. Because the heating tube is in the shape of a round tube, the installation direction of the heating tube is not easy to be accurately and quickly determined during installation, the installation direction of the heating tube in the cooking cavity cannot be ensured to be consistent during installation and production of the heating tube, and the installation efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a heat-generating tube with uniform heating.

The utility model discloses a following technical scheme realizes:

the heating tube comprises a container, a sheet heating body suspended in the container, and power supply parts penetrating out of two ends of the container, wherein the power supply parts are connected with two ends of the heating body, the heating body comprises a first heating part, the first heating part comprises a wide part and a narrow auxiliary part, the wide part and the narrow auxiliary part are alternately arranged in the length direction of the heating body, a cutting seam is arranged in the middle of the wide part, and the minimum distance between the end part of the cutting seam and the end part of the wide part is greater than the minimum distance between the side part of the cutting seam and the side part of the wide part.

Further, the minimum distance between the end part of the slit and the end part of the wide-width part is L1, and the minimum distance between the side part of the slit and the side part of the wide-width part is L2, L1 is more than or equal to 1.05L2 and less than or equal to 1.5L 2.

Furthermore, the inner diameter of the container is D, the width of the heating element is L, and D is more than or equal to 1.3L and less than or equal to 1.8L.

Further, the heat generating body further includes a second heat generating portion having a temperature lower than that of the first heat generating portion, and the first heat generating portion and the second heat generating portion are alternately arranged in a longitudinal direction of the heat generating body.

Furthermore, a cutting slot is arranged on the second heating part.

Further, the second heat generation portion is a conductive portion electrically connected to the first heat generation portion.

Furthermore, a support member is arranged on the second heating portion.

Further, the container is provided with an arc-shaped portion, and the support member is located at the arc-shaped portion.

Further, the conductive part is a molybdenum rod.

In addition, a cooking utensil is also provided, and the heating tube comprises the heating tube which is uniformly heated.

Compared with the prior art, the beneficial effects of adopting the technical scheme are that:

1. the minimum distance between the end part of the cutting slot and the end part of the wide-width part is larger than the minimum distance between the side part of the cutting slot and the side part of the wide-width part, and the resistance between the end part of the cutting slot and the end part of the wide-width part is reduced and the resistance between the side part of the cutting slot and the side part of the wide-width part is increased according to a calculation formula of the resistance.

2. The inner diameter of the container is D, the width of the heating body is L, D is not less than 1.3L and not more than 1.8L, the temperature of the inner wall of the container in the circumferential direction tends to be consistent further through setting of the ratio of the inner diameter of the container to the width of the heating body, heating of the heating tube is uniform, and therefore the cooking effect and the cooking efficiency of the cooking appliance are improved.

3. The heating body still includes the second portion that generates heat that the temperature is less than first portion that generates heat, and first portion that generates heat and second portion that generates heat set up in turn on the length direction of heating body, through setting up the temperature region of heating body, has optimized the temperature distribution that the district was placed to the edible material, so can avoid eating the local heat that the district was placed to the edible material and concentrate, and it is comparatively even to make the temperature distribution that the district was placed to the edible material, improves the culinary art effect.

4. The cutting seams are arranged on the second heating part, so that the temperature of the second heating part can be adjusted, the second heating part is matched with the first heating part, the temperature distribution of the food material placing area is further optimized, the local heat concentration of the food material placing area is avoided, the temperature distribution of the food material placing area is more uniform, and the cooking effect is improved.

5. The second heating part is a conductive part electrically connected with the first heating part, so that the phenomenon of sagging of the heating body caused by softening and under the action of gravity of the heating body can be avoided in the long-term use process of the heating body, and the reliability of the heating tube is improved.

6. The second heating part is provided with a support piece, so that the heating body can be further kept to be capable of absorbing stress and diffusing heat stably under the condition of thermal stress, the position change of the heating body in the container is prevented, and the reliability of the heating tube is improved. In addition, the tensile strength of the heating element is enhanced, and the rejection rate of the heating element during installation is reduced.

7. The container is equipped with arc portion, support piece is located arc portion, so, can make the shape of heating tube changeable, overcome the application limitation of the heating tube of current straight tube class on cooking utensil, make the heating tube can match with the culinary art chamber of different shapes, make the heating tube can use the cooking utensil of different grade type better on.

Drawings

The invention is described in further detail below with reference to the accompanying drawings:

FIG. 1 is a schematic view of a heat radiation of a heating element in a conventional heating tube;

FIG. 2 is a schematic view of a heating tube according to the first embodiment;

FIG. 3 is a schematic view showing a structure of a heat-generating body according to the first embodiment;

FIG. 4 is an enlarged view of A in FIG. 3;

FIG. 5 is a schematic view showing a structure of a heating element according to a second embodiment;

FIG. 6 is a schematic structural view of another embodiment of a heat-generating body of example two;

FIG. 7 is a schematic structural view of a heating element according to still another embodiment of the second embodiment;

FIG. 8 is a schematic view of a partial structure of a heating tube according to a third embodiment;

FIG. 9 is a schematic view of a partial structure of a heat generating tube according to a fourth embodiment;

FIG. 10 is a schematic structural view of a cooking appliance according to a fourth embodiment;

FIG. 11 is a sectional view of a cooking chamber of the fourth embodiment;

the corresponding reference numbers for the component names in the figures are as follows:

100. a cooking appliance; 10. a heat generating tube; 11. a heating element; 111. a side surface portion; 112. a planar portion; 113. a first heat-generating portion; 114. a second heat generating portion; 115. a wide part; 116. a narrow secondary portion; 117. cutting a seam; 12. a power supply unit; 121. a holder; 122. a support member; 123. an inner lead; 124. a molybdenum foil; 125. an external lead; 13. a container; 131. an arc-shaped portion; 132. a straight tube portion; 20. a cooking cavity; 21. a food material placement area; 22. an upper wall; 23. a transition section; 24. a rear wall; 25 lower wall; 30. a display control panel; 40. the oven door.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example one

As shown in fig. 2 to 4, the present invention provides a heating tube 10 with uniform heating, including a container 13, a sheet-shaped heating element 11 suspended in the container 13, and power supply parts 12 penetrating through both ends of the container 13, wherein both ends of the heating element 11 are connected to the power supply parts 12, the heating element 11 includes a first heating part 113, the first heating part 113 includes a wide part 115 and a narrow part 116, the wide part 115 and the narrow part 116 are alternately arranged in the length direction of the heating element 11, a slit 117 is arranged in the middle of the wide part 115, a minimum distance L1 between the end of the slit 117 and the end of the wide part 115 is greater than a minimum distance L2 between the side of the slit 117 and the side of the wide part 115, and it can be known from a calculation formula of resistance that, in a unit length, the same material, when the cross-sectional area is increased, the resistance is decreased; on the contrary, the resistance is increased; the resistance between the end of the cutting seam 117 and the end of the wide width part 115 is reduced, the resistance between the side of the cutting seam 117 and the side of the wide width part 115 is increased, because the resistance of the heating body 11 is in direct proportion to the temperature, the temperature of the area of the inner wall of the container, which is closer to the heating body, is reduced, and the temperature of the area, which is farther from the heating body, is increased, so that the temperature of the inner wall of the container in the circumferential direction tends to be consistent, the heating of the heating tube is uniform, the installation direction of the heating tube in the cooking cavity does not need to be set, the consistency of the cooking performance of the cooking appliance can be ensured, and the installation efficiency of the heating tube is improved.

In the present embodiment, the minimum distance between the end of the slit 117 and the end of the wide part 115 is L1, and the minimum distance between the side of the slit 117 and the side of the wide part 115 is L2, 1.05L2 ≤ L1 ≤ 1.5L 2; when L1 is less than 1.05L2, the temperature of the region of the container 13 near the heat-generating body 11 is higher than that of the region far from the heat-generating body; in the case where L1 is greater than 1.5L2, the temperature of the region of the container 13 near the heat generating element 11 is lower than the temperature of the region of the container 13 far from the heat generating element, and therefore the temperature of the inner wall of the container 13 in the circumferential direction tends to be uniform, and the heat generating tube 10 is heated uniformly.

In the embodiment, the inner diameter of the container 13 is D, the width of the heating element 11 is L, D is more than or equal to 1.3L and less than or equal to 1.8L, and the temperature of the inner wall of the container 13 in the circumferential direction is further enabled to be consistent by setting the ratio of the inner diameter of the container 13 to the width of the heating element 11, so that the heating of the heating tube 10 is uniform.

In the present embodiment, the heating element 11 is in the form of a thin film sheet mainly composed of a carbon-based substance and having two-dimensional isotropic thermal conductivity in the plane direction, and has flexibility, flexibility and elasticity, and the heat conductivity of the heating element is 200W/(m · K) and the thickness is 300 μm or less, and it is understood that the thickness of the heating element 11 may be 100 μm, 150 μm, 200 μm, 250 μm, or the like; among them, the heat-generating body 11 may be constituted of carbon fiber, and a specific production method of the heat-generating body 11 is referred to a production method disclosed in patent CN 1622695B. The heat generating body 11 made of the carbon fiber cannot be subjected to the cutting process because the heat conduction performance of the carbon fiber in the longitudinal direction is rapidly deteriorated when the carbon fiber is partially cut, so that the temperature of the heat generating body 11 is not uniform and the reliability is lowered; the heating body 11 can also be a graphite sheet which has the processing design property, so that the temperature range on the heating tube can be adjusted; preferably, the heating element 11 is a graphite sheet.

The graphite flake is obtained by performing high-temperature heat treatment on a polymer film or a polymer film added with 0.2-20 wt% of a filler, and the preparation method of the graphite flake adopts a conventional preparation method of the graphite flake in the field.

In the present embodiment, the power supply unit 12 includes a holder 121 attached to both ends of the heating element, a support 122, an inner lead 123, molybdenum foils 124, and outer leads 125, the holder 121 fixes the inner lead 123, and the inner lead 123 is electrically connected to the outer leads 125 led out from both ends of the container 13 to the outside of the container through the molybdenum foils 124 embedded in both end seal portions of the container 13.

It is understood that the container 13 is closed or not closed, because the heating element 11 is used at a temperature below 800 ℃, is oxidized at a slow rate, and has relatively little influence on the service life of the heating element 11; preferably, the container 13 is closed.

In the present embodiment, both ends of the container 13 are melted into a flat plate shape, and an inert gas, which is a mixed gas of argon, nitrogen, argon and xenon, or argon and krypton, is filled inside the container to prevent the oxidation of the heating element 11; the container 13 is made of a heat-resistant material, such as quartz glass, soda-lime glass, boric acid glass, lead glass and other glass materials; preferably, the container 13 is a quartz glass tube.

It is to be understood that, in the present embodiment, the wide width portion 115 and the narrow width portion 116 are formed by laser cutting the heat-generating body 11. Specifically, the heating element 11 is processed by pulse laser to obtain a desired shape, wherein, for the cutting seam with the cutting seam width of more than 80 μm, the wavelength of 1064nm is selected for processing, and as the laser under the wavelength belongs to thermal processing, the melting, ablation and evaporation are generated on the surface of the material, so that the complete ablation at the cutting seam is realized, and the processing quality of the heating element is improved; selecting short wavelength laser with wavelength of 532nm or 355nm for cutting slit with width below 80 μm; the heating element is cut and processed at the pulse frequency of 20kHz, the pulse width of 70ns, the power of 30W and the cutting speed of 100mm/s, so that the heating element is cut and formed at one time, repeated cutting is avoided, and the processing efficiency and the processing precision are improved.

Example two

As shown in fig. 5, the second embodiment of the present invention is different from the first embodiment in that, in the second embodiment, the heat generating body 11 further includes a second heat generating portion 114, the first heat generating portion 113 and the second heat generating portion 114 are alternately disposed in the length direction of the heat generating body 11, the second heat generating portion 114 is a graphite sheet without laser processing, so that the resistance of the second heat generating portion 114 is very small, the temperature of the second heat generating portion 114 is lower than that of the first heat generating portion 113, and the temperature distribution of the food material placing area is optimized by setting the temperature area of the heat generating body, so that the local heat concentration of the food material placing area 21 can be avoided, the temperature distribution of the food material placing area 21 is relatively uniform, and the cooking effect is improved.

As shown in fig. 6, the second heat generating portion 114 is provided with a slit 117, so that the temperature of the second heat generating portion 114 can be adjusted, and the second heat generating portion 114 is matched with the first heat generating portion 113, thereby further optimizing the temperature distribution of the food material placing area 21, avoiding local heat concentration in the food material placing area 21, making the temperature distribution of the food material placing area 21 more uniform, and improving the cooking effect.

It can be understood that the size of the slits 117 on the second heat generating portion 114 is smaller than the size of the slits 117 on the first heat generating portion 113, so that the resistance of the second heat generating portion 114 is much smaller than that of the first heat generating portion 113, and the temperature of the second heat generating portion 114 is lower than that of the first heat generating portion 113.

It is also understood that, as shown in fig. 7, the second heat generating portion 114 is a conductive portion electrically connected to the first heat generating portion 113, the conductive portion is a molybdenum rod, the molybdenum rod is fixedly and electrically connected to the end of the first heat generating portion 113 through a holding member, the holding member 121 is made of molybdenum, and the resistance of the molybdenum rod is small, so that the temperature of the second heat generating portion 114 is lower than that of the first heat generating portion 113. In addition, the molybdenum rods are arranged in the longitudinal direction of the heating element 11, and the heating element 11 is arranged in segments, so that the heating element 11 can be prevented from softening and sagging under the action of gravity of the heating element 11 during long-term use of the heating element 11, and the reliability of the heating tube 10 is improved. The molybdenum rod is provided with a support member 122, so that the heating element 11 can be further stably absorbed by stress and diffused by heat under the condition of thermal stress, the position change of the heating element 11 in the container 13 is prevented, and the reliability of the heating tube 10 is improved.

In the present embodiment, the length ratio of the second heat generating portion 114 to the first heat generating portion 113 is 0.3 to 0.55; preferably, the ratio of the length ratio of the second heat generating portion 114 to the first heat generating portion 113 is 0.33-0.45.

In the present embodiment, the ratio of the length of the two adjacent first heat-generating portions 113 on the heat-generating body 11 to the length of the heat-generating body 11 is 0.2 to 0.6.

Other structures and effects of the parts not described are the same as those of the first embodiment, and are not described in detail here.

EXAMPLE III

As shown in fig. 8, a third embodiment of the present invention is different from the first embodiment in that, in the third embodiment, the heating element 11 further includes a second heat generating portion 114, the first heat generating portion 113 and the second heat generating portion 114 are alternately disposed in a length direction of the heating element 11, the second heat generating portion 114 is a conductive portion electrically connected to the first heat generating portion 113, the conductive portion is a molybdenum rod, the molybdenum rod is fixedly and electrically connected to an end of the first heat generating portion 113 through a holding member 121, the resistance of the molybdenum rod is small, so that the temperature of the second heat generating portion 114 is lower than that of the first heat generating portion 113, a supporting member 122 is disposed on the molybdenum rod, the container 13 is of a semi-circular arc type or circular arc shape, the container 13 is provided with an arc portion 131, and the supporting member is disposed on the arc portion 131, so that the shape of the heating tube is changeable, thereby overcoming the application limitation of the existing heating tube of the straight tube type in the cooking appliance, the heating tube can be matched with cooking cavities of different shapes, so that the heating tube can be better applied to cooking appliances of different types.

In this embodiment, the molybdenum rod has a certain flexibility to satisfy the assembly between the heating body 11 and the container 13.

Example four

As shown in fig. 9, the present invention provides a fourth embodiment, which is different from the third embodiment in that, in the fourth embodiment, the container 13 includes an arc-shaped portion 131 and straight pipe portions 132, and the arc-shaped portion 131 is disposed between adjacent straight pipe portions 132.

Other structures and effects of the parts which are not described are the same as those of the embodiment, and are not described in detail here.

EXAMPLE five

As shown in fig. 10, the present embodiment provides a cooking appliance 100, which employs the heating tube 10 uniformly heated as described above, and the heating tube 10 is directly installed in the cooking cavity 20 without adjusting the installation direction thereof, so that the cooking performance of the cooking appliance 100 can be ensured to be consistent, and the installation efficiency of the heating tube can be improved.

In the present embodiment, the heat generating tube 10 is installed at an upper portion of the cooking chamber 20.

In the present embodiment, the cooking cavity 20 has a square structure, which is common in the field of oven technology; it can also be understood that the transition portions 23 are respectively disposed between the upper wall 22 and the rear wall 24 of the cooking cavity 20 and between the rear wall 24 and the lower wall 25, so as to increase the capacity of the cooking cavity 20, facilitate the temperature circulation in the cooking cavity 20, and better cook food, as shown in fig. 11.

In addition to the preferred embodiments described above, other embodiments of the present invention are also possible, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope of the present invention defined by the appended claims.

Claims

1. A heating tube capable of heating uniformly comprises a container, a sheet-shaped heating body suspended in the container and power supply parts penetrating out of two ends of the container, wherein the two ends of the heating body are connected with the power supply parts, the heating body comprises a first heating part, the first heating part comprises a wide part and a narrow auxiliary part, the wide part and the narrow auxiliary part are alternately arranged in the length direction of the heating body, and a cutting seam is arranged in the middle of the wide part.

2. A heat generating pipe uniformly heated as set forth in claim 1, wherein a minimum distance between the end of the slits and the end of the wide width part is L1, and a minimum distance between the side of the slits and the side of the wide width part is L2, 1.05L2 or more and L1 or more and 1.5L2 or less.

3. A heat-generating pipe heated uniformly as described in claim 2, wherein said container has an inner diameter D, and said heat-generating body has a width L of 1.3 L.ltoreq.D.ltoreq.1.8L.

4. A heat-generating tube heated uniformly as described in any one of claims 1 to 3, wherein the heat-generating body further comprises second heat-generating portions having a temperature lower than that of the first heat-generating portion, the first heat-generating portion and the second heat-generating portion being alternately arranged in the longitudinal direction of the heat-generating body.

5. A heat generating tube having uniform heating as described in claim 4, wherein said second heat generating portion is formed with slits.

6. A heat generation tube having uniform heating as described in claim 4, wherein said second heat generation portion is a conductive portion electrically connected to said first heat generation portion.

7. A heat generating tube having uniform heating as described in claim 6, wherein said second heat generating portion is provided with a support member.

8. A heat generating tube having uniform heating as set forth in claim 7, wherein said container is provided with an arc-shaped portion, and said supporting member is located at the arc-shaped portion.

9. A heat generating tube as defined in any of claims 6-8, wherein the conductive part is a molybdenum rod.

10. A cooking appliance comprising the heat generating pipe uniformly heated as claimed in any one of claims 1 to 9.