U-shaped heating tube

Abstract

This utility model discloses a U-shaped heating tube, including a heating tube, a heating wire, two fixing seats, and two connecting terminals. The heating tube is hollow, and the two fixing seats are connected to both ends of the heating tube. The heating wire is disposed inside the heating tube, and both ends of the heating tube are connected to the fixing seats, and both ends of the heating wire are connected to the connecting terminals. This heating tube, by setting up a heating tube, heating wire, fixing seats, and connecting terminals, wherein the heating tube is U-shaped, compared with the traditional straight tube heating element, the U-shaped heating tube is longer, has a larger heating area, and higher heating power, resulting in higher heating efficiency. In addition, the tension spacing of the heating wire located in the curved section is greater than that of the heating wire located in the straight section, so as to achieve a rapid heating effect. The overall structure is practical and reliable.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a U-shaped heating tube. Background Technology

[0002] An oven is a sealed appliance used for baking food or drying products. Ovens are categorized into household and industrial ovens. Some ovens are deeper than they are wide, meaning their cavity depth exceeds their width. This allows for the placement of more food, but the width limit restricts the heating elements. These ovens typically have straight heating elements, preventing the heating wires from being made larger or longer. This limits the heating element power, limiting it to low-power 300W units, making it difficult to meet market demands for rapid heating and baking. Furthermore, the deep cavity increases the risk of burns and difficulty in handling food. Increasing the power of conventional ovens requires adding more heating elements, which inevitably increases labor and material costs. The announcement number CN216675532U relates to an oven, including a cabinet and an electric heating element disposed within the cabinet. The cabinet includes a front cabinet portion and a rear cabinet portion, which together form a cooking cavity. The front cabinet portion is slidable relative to the rear cabinet portion in a front-to-back direction to change the size of the cooking cavity. A vertical plane passing through the middle position of the cooking cavity in the front-to-back direction is defined as a central plane. The mounting end of the electric heating element is away from the central plane, and the electric heating element has a portion extending towards the central plane. However, this oven's depth is less than its width, limiting its capacity for food, and it uses a straight heating element with low power. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a U-shaped heating tube with high heating power and rapid heating.

[0004] To achieve the above objectives, the present invention provides the following solution: a U-shaped heating tube, comprising a heating tube, a heating wire, two fixing seats, and two connecting terminals. The heating tube is hollow, and the two fixing seats are respectively connected to both ends of the heating tube. The heating wire is disposed inside the heating tube, and the fixing seats are connected to both ends of the heating tube. The connecting terminals are also connected to both ends of the heating wire.

[0005] The heating element is divided into two straight sections and a bent section. The two ends of the bent section are connected to the two straight sections respectively. The bent section and the two straight sections together form a U-shaped structure. The stretching distance of the heating wire in the bent section is greater than that of the heating wire in the straight section.

[0006] The beneficial effects of this utility model are: high power and rapid heating. The heating tube is composed of a heating tube, a heating wire, a fixing base, and connecting terminals. The heating tube has a U-shaped structure. Compared with the traditional straight tube heating element, the U-shaped heating tube is longer, has a larger heating area, and higher heating power, resulting in higher heating efficiency. In addition, the tension spacing of the heating wire located in the bend section is greater than that of the heating wire located in the straight section, so as to achieve a rapid heating effect. The overall structure is practical and reliable.

[0007] Furthermore, the U-shaped heating tube is disposed in the heating chamber (11) of the heating device. The length of the heating tube is L=a-20, the width of the heating tube is W=b / 2, and the radius of the heating tube is R=(L+W) / 5, where a is the width of the heating chamber, b is the length of the heating chamber, and b>a.

[0008] Furthermore, the wall thickness t of the heating tube is 0.9~2.0mm, and the tube diameter φ is 10~15mm.

[0009] Furthermore, the power of the heating element is P = 2(L + W) - R.

[0010] Furthermore, the connecting terminal is disposed within the fixed base.

[0011] Furthermore, the fixing seat is hollow, and a first mounting groove is opened at the rear end of the fixing seat. The first mounting groove is used for inserting and fixing the end of the straight pipe section.

[0012] Furthermore, the connecting terminal is bent into a connecting portion, and the front end of the fixing seat has a second mounting groove, the first mounting groove and the second mounting groove are connected, and the connecting portion protrudes from the second mounting groove.

[0013] Furthermore, it also includes two connecting pieces, two wires, and two protective sleeves. The two ends of the heating wire are respectively connected to the two connecting pieces, one end of the wire is connected to the connecting piece, the other end of the wire is connected to the connecting terminal, the protective sleeve is fitted onto the wire, and one end of the protective sleeve is inserted into the fixing base.

[0014] Furthermore, the rear end of the fixing seat is formed with a base, which is used to connect the end of the straight pipe section. Attached Figure Description

[0015] Figure 1 This is a three-dimensional embodiment of the present utility model. Figure 1 .

[0016] Figure 2 This is an exploded view of Embodiment 1 of the present invention.

[0017] Figure 3 This is an internal structural diagram of Embodiment 1 of the present invention.

[0018] Figure 4 This is a top view of Embodiment 1 of the present invention.

[0019] Figure 5 This is a side view of Embodiment 1 of the present invention.

[0020] Figure 6 This is a side view of the internal structure of an oven according to Embodiment 1 of the present invention.

[0021] Figure 7 This is a top view of the internal structure of an oven according to Embodiment 1 of this utility model.

[0022] Figure 8 This is an exploded view of Embodiment 2 of the present invention.

[0023] Figure 9 This is an internal structural diagram of Embodiment 2 of the present invention.

[0024] Figure 10 This is a 3D view of existing oven technology.

[0025] Among them, 11 is the heating chamber, 31 is the heating tube, 311 is the straight tube section, 312 is the bent tube section, 32 is the heating wire, 33 is the fixing seat, 331 is the first mounting groove, 332 is the second mounting groove, 333 is the base, 34 is the connecting terminal, 341 is the connecting part, 35 is the connecting piece, 36 is the wire, and 37 is the protective sleeve. Detailed Implementation

[0026] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1:

[0028] See appendix Figure 1 To be continued Figure 7 Appendix Figure 10 As shown, a U-shaped heating tube includes a heating tube 31, a heating wire 32, two fixing seats 33, and two connecting terminals 34. The heating tube 31 is hollow, and the two ends of the heating tube 31 are respectively connected to the two fixing seats 33. The heating wire 32 is disposed inside the heating tube 31, and both ends of the heating tube 31 are connected to the fixing seats 33. Both ends of the heating wire 32 are connected to the connecting terminals 34.

[0029] In this embodiment, the heating element 31 is divided into two straight pipe sections 311 and a bent pipe section 312. The two ends of the bent pipe section 312 are respectively connected to the two straight pipe sections 311. The stretching distance d2 of the heating wire 32 located in the bent pipe section 312 is greater than the stretching distance d1 of the heating wire 32 located in the straight pipe section 311.

[0030] In this embodiment, the connecting terminal 34 is disposed in the fixing base 33; specifically, the fixing base 33 is hollow, and a first mounting groove 331 is opened at the rear end of the fixing base 33. The first mounting groove 331 is used for the end of the straight pipe section 311 to be inserted and fixed; the connecting terminal 34 is bent to form a connecting part 341, and a second mounting groove 332 is opened at the front end of the fixing base 33. The first mounting groove 331 communicates with the second mounting groove 332, and the connecting part 341 protrudes from the second mounting groove 332.

[0031] In this embodiment, the connecting part 341 is used to connect a power supply wire to supply power to the heating wire 32.

[0032] Compared to traditional ovens, with the same oven installation width, the U-shaped structure using heating element 31 can theoretically increase the length by 2-3 times compared to using a conventional straight tube, and the power can be increased by 1-2 times.

[0033] In this embodiment, the material of the heating tube 31 can be: milky white quartz tube, transparent quartz glass tube, or quartz tube surface coated with far-infrared coating;

[0034] The heating wire 32 can be made of materials such as iron-chromium wire, nickel-chromium wire, carbon wire, and carbon sheet.

[0035] The materials that can be used for connecting terminal 34 include: galvanized sheet, aluminized sheet, stainless steel, and other metal materials;

[0036] The material that can be used for the mounting base 33 is ceramic, preferably high-frequency ceramic;

[0037] The above materials can be selected and used appropriately according to actual needs.

[0038] In this embodiment, the U-shaped heat pipe is disposed in the heating chamber 11 of the baking device. In order to make the size matching between the heating pipe 31 and the oven more reasonable, the size of the heating pipe 31 is subject to the following requirements:

[0039] Considering the structural strength of the heating element 31, the dimensions of the heating element 31 are as follows: the length of the heating element 31 is L=a-20 (a>130mm), the width of the heating element 31 is W=b / 2, and the radius of the heating element 31 is R=(L+W) / 5. This radius is a U-shaped radius of the heating element 31, where a is the width of the heating chamber 11, b is the length of the heating chamber 11, and b>a; the wall thickness t of the heating element 31 is 0.9~2.0mm, and the diameter φ of the heating element 31 is 10~15mm. This ensures that the heat from the heating wire 32 can be stably radiated onto the food, and also ensures that the heating wire 32 can pass through the heating element 31.

[0040] The power P of the heating tube 31 corresponds to the size of the heating chamber 11 and is related to the total length of the heating tube 31. Based on the actual baking effect of the whole machine, P = 2(L + W) - R. For example, the relevant dimensions of the heating chamber 11 in this embodiment are: a = 185mm, b = 290mm, the tube length of the heating tube 31 is L = a - 20, that is, L = 165mm; the width of the heating tube 31 is W = b / 2, that is, the width W = 145mm, and the bending radius of the heating tube 31 is R = (L + W) / 5, that is, R = 62mm. Therefore, the reasonable power value can be calculated as P = 2(L + W) - R, that is, P = 2 * (165 + 145) - 62 = 558 watts.

[0041] The heating element 31 needs to be balanced at both ends, that is, the two straight pipe sections 312 need to be balanced at both ends to ensure that the heating element is not broken during transportation.

[0042] In this embodiment, the size of the connecting terminal 34 is smaller than the inner diameter of the heating tube 31, so as to ensure that the connecting terminal 34 can pass through the heating tube 31.

[0043] The assembly process of this embodiment is as follows: First, the heating wire 32 is heated to form an oxide layer on the outer surface of the heating wire 32. Then, connecting terminals 34 are connected to both ends of the heating wire 32. Then, a connecting terminal 34 is pushed from one end of the heating tube 31 into the heating tube 31 to drive the heating wire 32 into the heating tube 31 until the connecting terminal 34 passes out from the other end of the heating tube 31. Then, two fixing seats 33 are respectively set at both ends of the heating tube 31. Specifically, the end of the heating tube 31 is inserted into the first mounting groove 331 of the fixing seat 33, and the connecting terminal 34 is inserted into the fixing seat 33, so that the connecting part 341 protrudes from the second mounting groove 332, which facilitates the subsequent connection of the power supply wire to the corresponding connecting part 341. Example 2:

[0044] See appendix Figure 8 To be continued Figure 9 As shown, the difference between this embodiment and Embodiment 1 is as follows:

[0045] It also includes two connecting pieces 35, two wires 36, and two protective sleeves 37. The two ends of the heating wire 32 are respectively connected to the two connecting pieces 35. One end of the wire 36 is connected to the connecting piece 35, and the other end of the wire 36 is connected to the connecting terminal 34. The protective sleeve 37 is fitted onto the wire 36, and one end of the protective sleeve 37 is inserted into the fixing seat 33.

[0046] In this embodiment, the rear end of the fixing seat 33 is formed with a base 333, which is used to connect the end of the straight pipe section 311.

[0047] In this embodiment, the connecting piece 35 can be made of metal materials such as galvanized sheet, aluminized sheet, and stainless steel.

[0048] Materials that can be used for conductor 36 include: high-temperature resistant fiberglass conductors, Teflon conductors, etc.

[0049] The protective sleeve 37 can be made of materials such as fiberglass sleeve, silicone fiberglass sleeve, etc.

[0050] The materials that can be used for connecting terminal 34 include: circular ring segments, male and female plug segments, etc.

[0051] The above materials can be selected and used appropriately according to actual needs.

[0052] In this embodiment, the manufacturing requirements for the heating wire 32 are as follows:

[0053] 1. According to the riveting method of the heating wire 32, it can be divided into the form of heating wire 32 + connecting terminal 34, which corresponds to Embodiment 1, or the form of heating wire 32 + connecting piece 35 + wire 36 + connecting terminal 34, which corresponds to this embodiment;

[0054] 2. Depending on the different requirements of the overall size, the diameter of the heating wire 32 can be changed during the manufacturing process, and the distance of the heating wire 32 winding can also be adjusted accordingly. If uniform heat distribution is required, then d1=d2.

[0055] 3. If more heat needs to be distributed front to back and less heat needs to be distributed left to right in the heating chamber 11, then d1 < d2;

[0056] 4. If more heat needs to be distributed horizontally and less heat needs to be distributed front to back within the heating chamber 11, then d1 > d2.

[0057] 5. The amount of heat generated by the heating wire 32 can be changed by altering the distance d2, or by varying the length of d3, thus controlling the amount of heat and improving the browning of the food. Here, d3 is the length of the heating wire 32 within the bent section 312.

[0058] The assembly process of this embodiment is as follows: First, the heating wire 32 is heated to form an oxide layer on the outer surface of the heating wire 32. Then, connecting pieces 35 are connected to both ends of the heating wire 32. The connecting pieces 35 are connected to wires 36. Then, the bases 333 of the two fixing seats 33 are respectively connected to the two ends of the heating tube 31, and the wires 36 are passed through the fixing seats 33.

[0059] At this point, the protective sleeve 37 is fitted onto the wire 36, and one end of the protective sleeve 37 is inserted into the fixing seat 33. Then, the other end of the wire 36 is connected to the connecting terminal 34.

[0060] At this time, push a connecting terminal 34 from one end of the heating tube 31 into the heating tube 31, so as to drive the heating wire 32, wire 36, connecting piece 35 and protective sleeve 37 into the heating tube 31, until the connecting terminal 34 passes out from the other end of the heating tube 31, so that the power supply wire can be connected to the corresponding connecting terminal 34.

[0061] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any person skilled in the art can make more possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, all equivalent changes made based on the concept of this utility model without departing from the content of the technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A U-shaped heating tube comprising a heating tube (31), a heating wire (32), two fixing bases (33) and two connecting terminals (34), characterized in that: The heating tube (31) is hollow, and two fixed seats (33) are connected to both ends of the heating tube (31). The heating wire (32) is disposed inside the heating tube (31). Both ends of the heating tube (31) are connected to the fixed seats (33), and both ends of the heating wire (32) are connected to the connecting terminals (34). The heating element (31) is divided into two straight pipe sections (311) and a bent pipe section (312). The two ends of the bent pipe section (312) are respectively connected to the two straight pipe sections (311). The stretching distance of the heating wire (32) located in the bent pipe section (312) is greater than the stretching distance of the heating wire (32) located in the straight pipe section (311).

2. A U-tube heating pipe according to claim 1, characterized in that: The U-shaped heating tube is installed in the heating chamber (11) of the heating device. The length of the heating tube (31) is L=a-20, the width of the heating tube (31) is W=b / 2, and the radius of the heating tube (31) is R=(L+W) / 5. Where a is the width of the heating chamber (11), b is the length of the heating chamber (11), and b>a.

3. A U-tube heater as defined in claim 1, wherein: The wall thickness t of the heating tube (31) is 0.9~2.0mm, and the diameter φ of the heating tube (31) is 10~15mm.

4. A U-tube heater as defined in claim 1, wherein: The power of the heating element (31) is P=2(L+W)-R.

5. A U-tube heater as defined in claim 1, wherein: The connection terminal (34) is disposed within the fixed base (33).

6. A U-tube heater as defined in claim 1, wherein: The fixing seat (33) is hollow, and a first mounting groove (331) is opened at the rear end of the fixing seat (33). The first mounting groove (331) is used for the end of the straight pipe section (311) to be inserted and fixed.

7. A U-tube heating pipe according to claim 6, characterized in that: The connecting terminal (34) is bent into a connecting part (341), and the front end of the fixing seat (33) has a second mounting groove (332). The first mounting groove (331) communicates with the second mounting groove (332), and the connecting part (341) protrudes from the second mounting groove (332).

8. A U-tube heater as defined in claim 1, wherein: It also includes two connecting pieces (35), two wires (36), and two protective sleeves (37). The two ends of the heating wire (32) are respectively connected to the two connecting pieces (35). One end of the wire (36) is connected to the connecting piece (35), and the other end of the wire (36) is connected to the connecting terminal (34). The protective sleeve (37) is fitted onto the wire (36), and one end of the protective sleeve (37) is inserted into the fixing seat (33).

9. A U-tube heating pipe according to claim 8, characterized in that: The fixed seat (33) has a base (333) formed at its rear end, and the base (333) is used to connect the end of the straight pipe section (311).

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