U-shaped heating tube

Abstract

Provide a U-shaped heating tube. [Solution] The heating tube comprises a heating tube (31), a heating wire, two fixing seats (33) and two connecting terminals. The heating tube is hollow and connected at both ends to the two fixing seats. The heating wire is disposed within 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. The heating tube is provided with a heating tube, a heating wire, a fixing seat and a connecting terminal. The heating tube has a U-shaped structure. Compared with conventional straight tube heating elements, the U-shaped heating tube is longer, has a larger heating area, higher heating power and higher heating efficiency. The winding pitch of the heating wire located at the curved tube section (312) is larger than that of the heating wire located at the straight tube section (311), thereby achieving a rapid heating effect. The entire structure is practical and reliable.

Description

[Technical Field]

[0001] The present invention relates to the technical field of electrical appliances, and in particular to a U-shaped heating tube. [Background technology]

[0002] Ovens are enclosed electrical appliances for baking food or drying products, and can be divided into domestic and industrial ovens. Some ovens are deeper than their width, meaning the chamber is deeper than its width, allowing for more food to be placed inside. However, due to the width constraints, the heating tubes in these ovens can only be designed as straight tubes, preventing longer tube bodies and preventing the heating wires of the heating tubes from being larger or longer. This limits the power of the heating tubes, limiting the production of low-power heating tubes of 300W, which is difficult to meet the market demand for fast heating and fast baking. Furthermore, the chamber is too deep, which can easily cause problems such as burns to hands and difficulty in putting food in and taking it out. In general, to increase the power, the only option is to increase the number of heating tubes, which inevitably increases labor and material costs. Publication No. CN216675532U relates to an oven, the oven comprising a main body and an electric heating tube installed within the main body, the main body including a front body portion and a rear body portion, the front body portion and the rear body portion forming a cooking chamber, the front body portion sliding relative to the rear body portion in the front-to-rear direction to change the size of the cooking chamber, the vertical plane at the midpoint of the cooking chamber in the front-to-rear direction being defined as a central plane, the mounting end of the electric heating tube being away from the central plane and the electric heating tube having a portion extending toward the central plane, the oven's depth is smaller than its width, it cannot accommodate more food, a straight tube is used, and the heating tube's power is low. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the deficiencies of the prior art, the object of the present invention is to provide a U-shaped heating tube with large heating power and rapid heating. [Means for solving the problem]

[0004] To achieve the above object, the present invention provides the following technical means: the U-shaped heating tube includes a heating tube, a heating wire, two fixing seats, and two connecting terminals, the heating tube is hollow and both ends are connected to the two fixing seats, the heating wire is disposed inside the heating tube, 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; The heating tube is divided into two straight tube sections and a curved tube section, and both ends of the curved tube section are connected to the two straight tube sections, and the curved tube section and the two straight tube sections together form a U-shaped structure, and the winding pitch of the heating wire located in the curved tube section is larger than the winding pitch of the heating wire located in the straight tube section. [Effects of the Invention]

[0005] The present invention has the following beneficial effects: high power and rapid heating; the heating tube comprises a heating tube, a heating wire, a fixing seat, and a connecting terminal, and the heating tube has a U-shaped structure; compared with conventional straight-tube heating elements, the U-shaped heating tube is longer, has a larger heating area, higher heating power, and higher heating efficiency; the winding pitch of the heating wire in the curved tube section is larger than that of the heating wire in the straight tube section, thereby achieving a rapid heating effect, and the entire structure is practical and reliable.

[0006] Furthermore, the U-shaped heating tube is installed in the heating chamber of the heating device, and the heating tube has a length L=a-20, a width W=b / 2, and a radius R=(L+W) / 5, where a is the width of the heating chamber, b is the length of the heating chamber, and b>a.

[0007] Furthermore, the heating tube has a tube wall thickness t of 0.9 to 2.0 mm and a tube body diameter φ of 10 to 15 mm.

[0008] Furthermore, the power of the heating tube is P=2(L+W)-R.

[0009] Furthermore, the connection terminal is provided in the fixing seat.

[0010] Furthermore, the fixing seat is hollow, and a first mounting groove is formed at the rear end of the fixing seat into which the end of the straight pipe portion is inserted and fixed.

[0011] Furthermore, the connection terminal has a connection portion formed by bending, a second mounting groove is formed at the front end of the fixing seat, the first mounting groove is connected to the second mounting groove, and the connection portion protrudes from the second mounting groove.

[0012] The heating wire further includes two connecting plates, two conductive wires, and two protective sleeves, and both ends of the heating wire are connected to the two connecting plates, one end of the conductive wire is connected to the connecting plate, and the other end is connected to the connection terminal. The protective sleeve is fitted onto the conductive wire, and one end is inserted into the fixing seat.

[0013] Furthermore, a base is formed at the rear end of the fixed seat to be connected to the end of the straight pipe portion. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view of a first embodiment of the present invention; [Figure 2] FIG. 1 is an exploded view of the first embodiment of the present invention. [Figure 3] FIG. 1 is an internal structural diagram of a first embodiment of the present invention. [Figure 4] FIG. 1 is a top view of a first embodiment of the present invention. [Figure 5] FIG. 1 is a side view of the first embodiment of the present invention. [Figure 6] 1 is a side view of the internal structure of the oven according to the first embodiment of the present invention; FIG. [Figure 7] FIG. 2 is a top view of the internal structure of the oven according to the first embodiment of the present invention. [Figure 8] FIG. 2 is an exploded view of the second embodiment of the present invention. [Figure 9] FIG. 2 is an internal structural diagram of the second embodiment of the present invention. [Figure 10]1 is a prior art perspective view of an oven; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, the technical means of the present invention will be clearly and completely described with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work are all within the scope of protection of the present invention.

[0016] In describing the present invention, the orientations or positional relationships indicated by the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," "outside," etc. are based on the illustrations and are intended merely to illustrate and simplify the present invention, and should not be understood as limiting the present invention, as they do not indicate or suggest that the devices or components shown must have a particular orientation, be configured and operate in a particular orientation, etc. Furthermore, the terms "first," "second," and "third" are merely for illustrative purposes and should not be understood as indicating or implying relative importance. [Example]

[0017] As shown in FIGS. 1 to 7 and 10 , the U-shaped heating pipe includes a heating pipe 31, a heating wire 32, two fixing seats 33 and two connecting terminals 34, the heating pipe 31 is hollow and both ends are connected to the two fixing seats 33, the heating wire 32 is disposed inside the heating pipe 31, both ends of the heating pipe 31 are connected to the fixing seats 33, and both ends of the heating wire 32 are connected to the connecting terminals 34.

[0018] In this embodiment, the heating tube 31 is divided into two straight pipe sections 311 and a curved pipe section 312, and both ends of the curved pipe section 312 are connected to the two straight pipe sections 311, respectively. The winding pitch d2 of the heating wire 32 located in the curved pipe section 312 is larger than the winding pitch d1 of the heating wire 32 located in the straight pipe section 311.

[0019] In this embodiment, the connection terminal 34 is provided within the fixed seat 33. Specifically, the fixed seat 33 is hollow, and a first mounting groove 331 is formed at the rear end of the fixed seat 33, into which the end of the straight pipe portion 311 is inserted and fixed. A connection portion 341 is bent and formed in the connection terminal 34. A second mounting groove 332 is formed at the front end of the fixed seat 33. The first mounting groove 331 is connected to the second mounting groove 332, and the connection portion 341 protrudes from the second mounting groove 332.

[0020] In this embodiment, the connection part 341 is connected to an electric wire of a power source to supply power to the heating wire 32 .

[0021] Compared to conventional ovens, the oven has the same installation width, and the use of the U-shaped structure of the heating tube 31 logically makes it 2 to 3 times longer than that of a conventional straight tube, and increases the power by 1 to 2 times.

[0022] In this embodiment, the material of the heating tube 31 can be a milky white quartz tube, a transparent quartz glass tube, or a quartz tube with a far-infrared coating layer sprayed on the surface. The material of the heating wire 32 can be an iron chrome wire, a nickel chrome wire, a carbon wire, a carbon sheet, or other heating material. The connection terminal 34 may be made of a metal material such as a zinc-plated steel plate, an aluminum-plated plate, or stainless steel. The material of the fixed seat 33 may be ceramic, preferably high-frequency ceramic. The above materials can be selected and used appropriately according to the actual purpose.

[0023] In this embodiment, the U-shaped heating tube of this embodiment is installed in the heating chamber 11 of the baking apparatus, and in order to make the heating tube 31 more reasonably matched to the size of the oven, the size of the heating tube 31 meets the following requirements:

[0024] Considering the strength of the mounting structure of the heating tube 31, the manufacturing size of the heating tube 31 is as follows: length L=a-20 (a>130mm), width W=b / 2, and radius 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. The heating tube 31 has a wall thickness t of 0.9-2.0mm and a body diameter φ of 10-15mm, which can ensure that the heat of the heating wire 32 is radiated stably to the food and that the heating wire 32 passes through the heating tube 31.

[0025] The power P of the heating tube 31 is set according to the size of the heating chamber 11 and is also related to the total length of the heating tube 31. According to the overall actual baking effect, it can be obtained as P=2(L+W)-R. For example, the relevant dimensions of the heating chamber 11 in this embodiment are a=185mm, b=290mm, the length of the heating tube 31 is L=a-20, i.e., L=165mm, the width W of the heating tube 31 is W=b / 2, i.e., the width W=145mm, and the curvature radius R of the heating tube 31 is R=(L+W) / 5, i.e., R=62mm. Therefore, the optimum power value P can be calculated as P=2(L+W)-R, i.e., P=2×(165+145)-62=558 watts.

[0026] Both ends of the heating tube 31 need to be balanced, that is, both ends of the two straight tube sections 311 need to be balanced, which ensures that the heating element is not easily broken during transportation.

[0027] In this embodiment, the size of the connection terminal 34 is smaller than the diameter of the inner wall of the heating tube 31 , thus ensuring that the connection terminal 34 passes through the heating tube 31 .

[0028] The assembly process of this embodiment is as follows: first, the heating wire 32 is heated to form an oxide layer on its outer surface, then connecting terminals 34 are attached to both ends of the heating wire 32, and one connecting terminal 34 is pushed from one end of the heating tube 31 into the heating tube 31 until it emerges from the other end, thereby driving the heating wire 32 into the heating tube 31, and then two fixing seats 33 are attached to both ends of the heating tube 31, respectively. Specifically, the end of the heating tube 31 is inserted into the first mounting groove 331 of the fixing seats 33, and the connecting terminal 34 is inserted into the fixing seats 33, with the connecting part 341 protruding from the second mounting groove 332, so that the subsequent power supply wire can be easily connected to the corresponding connecting part 341. [Example]

[0029] As shown in FIGS. 8 and 9, the present embodiment differs from the first embodiment in the following points.

[0030] It further includes two connecting plates 35, two conductive wires 36, and two protective sleeves 37, and both ends of the heating wire 32 are respectively connected to the two connecting plates 35, one end of the conductive wire 36 is connected to the connecting plate 35, and the other end is connected to the connection terminal 34, and the protective sleeve 37 is fitted over the conductive wire 36, and one end is inserted into the fixed seat 33.

[0031] In this embodiment, a base 333 that is connected to the end of the straight pipe portion 311 is formed at the rear end of the fixed seat 33 .

[0032] In this embodiment, the material of the connection plate 35 can be a metal material such as a zinc-plated steel plate, an aluminum-plated plate, or stainless steel. The material of the conductor 36 may be a high-temperature resistant glass fiber conductor, a Teflon (registered trademark) conductor, etc. The material of the protective sleeve 37 can be a glass fiber sleeve, a silicon glass fiber sleeve, etc. The material of the connection terminal 34 can be a ring terminal, a male and female tab terminal, etc. The above materials can be selected and used appropriately according to the actual purpose.

[0033] In this embodiment, the manufacturing requirements for the heating wire 32 are as follows.

[0034] 1. Depending on the crimping form of the heating wire 32, it may be divided into a form of heating wire 32 + connecting terminal 34, which corresponds to Example 1, or a form of heating wire 32 + connecting plate 35 + conducting wire 36 + connecting terminal 34, which corresponds to this example.

[0035] 2. When manufacturing the heating wire 32 according to different requirements for the overall size, the coil diameter of the heating wire 32 may be changed, and the winding pitch of the heating wire 32 may be adjusted accordingly. If it is required to distribute the heat evenly, d1=d2.

[0036] 3. If it is necessary to distribute the heat in the heating chamber 11 more in the front and rear and less in the left and right, <d2である。

[0037] 4. If it is required that the amount of heat generated in the heating chamber 11 is large on the left and right sides and small on the front and rear sides, then d1>d2.

[0038] 5. The magnitude of the heat generation amount on the left and right sides of the heating wire 32 can be changed by changing the distance d2, and the magnitude of the heat generation amount can be controlled by changing the extension length d3, which improves the browning of food, and d3 is the length of the heating wire 32 within the bent tube portion 312.

[0039] The assembly process of this embodiment is as follows: First, heat the heating wire 32 to form an oxide layer on the outer surface of the heating wire 32; then, connect the connecting plates 35 to both ends of the heating wire 32, and connect the connecting plates 35 to the wires 36; then, connect the bases 333 of the two fixing seats 33 to both ends of the heating tube 31, respectively, and pass the wires 36 through the fixing seats 33; In this case, the protective sleeve 37 is fitted onto the conductor 36, one end of the protective sleeve 37 is inserted into the fixing seat 33, and the other end of the conductor 36 is connected to the connecting terminal 34. In this case, one connection terminal 34 is pushed from one end of the heating tube 31 into the heating tube 31 until it emerges from the other end of the heating tube 31, and the heating wire 32, the conducting wire 36, the connecting plate 35 and the protective sleeve 37 are driven to enter the heating tube 31, so that the electric wire of the subsequent power supply can be easily connected to the corresponding connection terminal 34.

[0040] The above-described embodiments are merely preferred embodiments of the present invention and do not limit the present invention in any way. Those skilled in the art can use the technical content disclosed above to make many possible changes and modifications to the technical means of the present invention, or modify them into equivalent embodiments of equivalent changes, without departing from the scope of the technical means of the present invention. Therefore, any equivalent changes made based on the concept of the present invention that do not deviate from the technical means of the present invention should be included in the protection scope of the present invention. [Explanation of symbols]

[0041] 11 Heating chamber 31 Heating tube 311 Straight pipe section 312 Bent pipe section 32 Heating wire 33 Fixed seat 331 First mounting groove 332 Second mounting groove 333 Base 34 Connection terminal 341 Connection 35 Connection plate 36 Conductor 37 Protective sleeve

Claims

1. A U-shaped heating tube includes a heating tube (31), a heating wire (32), two fixing seats (33), and two connecting terminals (34), wherein the heating tube (31) is hollow and both ends are connected to the two fixing seats (33), the heating wire (32) is disposed within the heating tube (31), both ends of the heating tube (31) are connected to the fixing seats (33), and both ends of the heating wire (32) are connected to the connecting terminals (34); The heating pipe (31) is divided into two straight pipe sections (311) and a curved pipe section (312), both ends of the curved pipe section (312) are connected to the two straight pipe sections (311), and the winding pitch of the heating wire (32) located in the curved pipe section (312) is larger than the winding pitch of the heating wire (32) located in the straight pipe section (311).

2. The U-shaped heating tube according to claim 1, characterized in that the heating tube (31) is provided in a heating chamber (11) of a heating device, and has a length L = a - 20, a width W = b / 2, and a radius 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. 2. The U-shaped heating tube according to claim 1, wherein the heat generating tube (31) has a tube wall thickness t of 0.9 to 2.0 mm and a tube body diameter φ of 10 to 15 mm.

4. The U-shaped heating tube according to claim 1, characterized in that the power of the heating tube (31) is P=2(L+W)-R.

5. 2. The U-shaped heating tube according to claim 1, wherein the connecting terminal (34) is provided in a fixing seat (33).

6. 2. The U-shaped heating tube according to claim 1, wherein the fixing seat (33) is hollow, and a first mounting groove (331) is formed at a rear end of the fixing seat (33) into which an end of the straight tube portion (311) is inserted and fixed.

7. 7. The U-shaped heating tube according to claim 6, wherein the connecting terminal (34) has a connecting portion (341) formed by bending, a second mounting groove (332) is formed at a front end of the fixing seat (33), the first mounting groove (331) is connected to the second mounting groove (332), and the connecting portion (341) protrudes from the second mounting groove (332).

8. 2. The U-shaped heating tube according to claim 1, further comprising two connection plates (35), two conducting wires (36), and two protective sleeves (37), wherein both ends of the heating wire (32) are connected to the two connection plates (35), respectively, one end of the conducting wire (36) is connected to the connection plate (35) and the other end is connected to the connection terminal (34), and the protective sleeve (37) is fitted onto the conducting wire (36), and one end is inserted into the fixing seat (33).

9. 9. The U-shaped heating tube according to claim 8, wherein a base (333) connected to an end of the straight tube portion (311) is formed at the rear end of the fixing seat (33).

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