CN210444509U

CN210444509U - U-shaped hollow tube electric heating radiant tube

Info

Publication number: CN210444509U
Application number: CN201920202426.3U
Authority: CN
Inventors: 倪高金; 陆秀栋
Original assignee: Jiangsu Jinda Electrical Heating Electrical Appliance Co ltd
Current assignee: Jiangsu Jinda Electrical Heating Electrical Appliance Co ltd
Priority date: 2019-02-15
Filing date: 2019-02-15
Publication date: 2020-05-01
Anticipated expiration: 2029-02-15

Abstract

The utility model provides a U-shaped hollow tube electric heating radiant tube, which comprises a pair of hollow heating tube bodies, a connecting part which connects and penetrates through one end part of the tube body into a U-shaped structure, a connecting tube which is connected with the other end of the tube body, a heat preservation section which is made of heat preservation materials is arranged on the periphery of part of the connecting tube, and a fixing plate which fixes the heating radiant tube and a boiler is arranged at the joint of the connecting tube and the heat preservation section; the end part of the connecting pipe is provided with a thread structure; the connecting pipes are respectively provided with electrode connecting terminals connected with the positive electrode and the negative electrode of the power supply; the joints of the hollow heating pipe body and the connecting pipe and the joints of the connecting parts and the hollow heating pipe body are in full-weld welding connection by adopting circumferential seams. The electric heating radiant tube of the utility model directly adopts the electrothermal alloy to manufacture the hollow heating tube, the weight of the material is only about 20 percent of the original weight, the material cost is obviously reduced, and the energy consumption required by heating is obviously reduced; the temperature control precision is high; long service life and high heating power.

Description

U-shaped hollow tube electric heating radiant tube

Technical Field

The utility model relates to an industry electrical heating technical field especially relates to a U type hollow tube electrical heating radiant tube.

Background

In present industrial electric heating technical field, for example, industrial boiler heating field, generally all is the electric heating rod who uses U type structure, and one or more heating resistor silk is placed to U type sleeve intraduct, and the resistance silk utilizes the support chassis to fix inside the cover pipe, and this kind of electric heating pipe's manufacturing process is more ripe, though the technology step is more but relatively easier, and it is convenient to make, consequently adopted in a large number, but this kind of electric heating pipe also has a great deal of problem:

(1) the structure of the sleeve and the built-in resistance wire is adopted, so that the material consumption and the mass of the electric heating pipes are large, the weight of one group of heating pipes is 50-60 kilograms, and the material cost is high; because the electric heating pipe has large mass, the energy consumption required by heating is higher;

(2) the electric heating tube with the built-in resistance wire structure is characterized in that the internal resistance wire firstly generates heat and conducts to the sleeve, the sleeve radiates heat into the furnace, and a temperature gradient exists between the electric heating tube and the ambient temperature, for example, if the required ambient temperature is 900 ℃, the actual temperature of the resistance wire in the sleeve is 950 plus 1000 ℃, the resistance wire is greatly influenced by high-temperature oxidation, the service life of the resistance wire is shortened, namely the service life of the electric heating tube is influenced, and the maintenance cost of a client is increased;

(3) the electric heating pipe sleeve with the structure has thicker wall thickness and large surface load, an effective air circulation channel cannot be formed inside, the heat dissipation is slow, and the internal temperature is overhigh during use, so that the heating radiation pipe is easy to crack caused by internal expansion; if the cooling process is to be accelerated, a cooling device or a cooling pipe is not needed to be additionally arranged beside the furnace, and the electric heating pipe is cooled by using the cooling device after the use is finished, so that the additional equipment investment is increased;

(4) because temperature gradients exist among the internal heating resistance wire, the sleeve with thicker wall thickness and the ambient temperature, the temperature control area of the electric heating tube is larger due to the influence of thermal inertia, for example, the actually required temperature in the furnace is 900 ℃, in order to reach the required furnace temperature, the actual temperature of the resistance wire during gradual heating needs to reach 950 plus material temperature 1000 ℃, the temperature in the furnace also gradually rises to exceed 900 ℃, when the temperature in the furnace is overhigh, the heating temperature of the resistance wire needs to be reduced, but the temperature reduction is always performed gradually due to the thermal inertia; conversely, when the temperature in the furnace becomes lower, the heating temperature of the resistance wires needs to be increased; therefore, the actual temperature in the furnace is difficult to be maintained stably at about 900 ℃, the larger the thickness and material mass of the heating tube is, the larger the thermal inertia influence is, and the smaller the temperature control precision is (the temperature control range is larger, generally +/-30 ℃).

Therefore, the sleeve type electric heating rod commonly used in the industrial electric heating field at present has the advantages of large material consumption, high cost, high energy consumption, large surface load and difficult heat dissipation, and is not in accordance with the green industrial production idea advocated by the state; and the temperature control precision is not very excellent, and the higher and higher use requirements of customers cannot be met.

Disclosure of Invention

The defect that U type electrical heating stick exists among the prior art, the utility model aims at providing a U type cavity electrical heating radiant tube can show the quantity that reduces the electrothermal alloy, improves the control by temperature change precision, reduces the energy consumption and can cool off fast.

In order to achieve the purpose of the utility model, the U-shaped hollow electric heating radiant tube of the utility model comprises a pair of hollow heating tube bodies, a connecting part which connects and penetrates through one end part of the tube body into a U-shaped structure, and a connecting tube which is connected with the other end of the tube body, wherein the periphery of part of the connecting tube is provided with a heat preservation section which is made of heat preservation materials, and the joint of the connecting tube and the heat preservation section is provided with a fixing plate which fixes the heating radiant tube and a boiler; the end part of the connecting pipe is provided with a thread structure; the connecting pipe is respectively provided with an electrode connecting terminal connected with the positive electrode and the negative electrode of the power supply; the hollow heating pipe body and the connecting pipe are in full-welding connection through circumferential seams, and the connecting part of the hollow heating pipe body and the connecting pipe is in full-welding connection with the connecting part of the hollow heating pipe body.

Preferably, the wall thickness of the hollow heating pipe body is 2.5-3.5 mm.

Preferably, the wall thickness of the hollow heating pipe body is 2.8-3.2 mm.

Still preferably, the diameter of the hollow heating pipe body is 60-65 mm.

Still preferably, the diameter of the hollow heating pipe body is 62-63.5 mm.

Preferably, the joint of the connecting pipe and the heating pipe body is connected by a connecting sleeve, and two ends of the connecting sleeve are respectively connected with the connecting pipe and the heating pipe body by adopting a circumferential seam full-weld welding mode.

The utility model has the advantages that the electric heating radiant tube directly adopts the electric heating alloy to manufacture the hollow heating tube, the weight of the material is only about 20 percent of the original weight, the material cost is obviously reduced, and the energy consumption required by heating is obviously reduced; the electric heating radiant tube is a hollow heating tube body made of electrothermal alloy and is directly electrified and heated, no temperature gradient exists between the electric heating tube and the ambient temperature, and the temperature control precision is high; in addition, the electric heating radiant tube can be directly communicated with the air cooling tube for rapid cooling, so that the high-temperature oxidation effect of the electric heating alloy hollow heating tube body is reduced, and the service life of the electric heating radiant tube is prolonged; the heating power of the heating radiant tube is obviously improved.

Drawings

The foregoing and other objects, features, and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings. Wherein:

fig. 1 is a schematic perspective view of a U-shaped hollow tube electric heating radiant tube according to an embodiment of the present invention;

FIG. 2 is a schematic front view of the U-shaped hollow electric heating radiant tube shown in FIG. 1;

fig. 3 is a schematic structural view of a U-shaped hollow tube electric heating radiant tube according to another embodiment of the present invention.

Detailed Description

Referring to fig. 1, a schematic structural diagram of a U-shaped hollow tube electric heating radiant tube according to the present invention is shown, the electric heating radiant tube includes hollow heating tube bodies 10 arranged in pairs, a connecting part 12 connecting one end of each of the hollow heating tube bodies 10 to form a U-shaped structure, a connecting tube 14 (electrode lead-out tube) connected to the other end of each of the hollow heating tube bodies 10, a heat insulating section 20 made of a heat insulating material and disposed on the periphery of a part of the connecting tube 14, and a fixing plate 22 disposed at the connection between the connecting tube 14 and the heat insulating section 20 and fixing the heating radiant tube to a boiler; the end part of the connecting pipe 14 is provided with a thread structure 142, so that the connecting pipe is conveniently connected with a cooling pipe; the connecting pipe 14 is respectively provided with an electrode connecting terminal 16 which is connected with the positive pole and the negative pole of a power supply; the joint 18 of the hollow heating pipe body 10 and the connecting pipe 14 and the joint 28 of the connecting part 12 and the hollow heating pipe body 10 are connected by adopting circumferential seam full-weld welding; a sealing element 21 is arranged at the joint of the connecting pipe 14 and the fixing plate 22, and the sealing element 21 is preferably a ceramic sealing element; the connecting portion 12 connects the ends of the two hollow tubes 10 to realize an electrical conduction during heating and a cooling air circulation circuit during cooling.

In a preferred embodiment, the hollow heating pipe body 10 is made of Ni-based superalloy Cr20Ni 80A; in another preferred embodiment, the wall thickness of the hollow heating tube body 10 is 2.5-3.5 mm. The hollow heating pipe 10 of the utility model is formed by adopting high temperature electrothermal alloy to directly form a pipe by a pipe making process, and then forming a sealed pipe by plasma welding, when the wall thickness is thick, the pipe making is difficult, and the pipe is not easy to form a regular pipe shape, and when the wall thickness is too large, the material cost and the energy consumption can be increased; the strength of the heating radiant tube can be influenced by the too thin wall thickness, and the heating radiant tube is easy to deform, so that the wall thickness of the heating tube body is limited to 2.5-3.5mm on the basis of an actual test, the heating requirement can be ensured, and the forming rate, the material cost and the energy consumption of the tube processing are considered; in a more preferred embodiment, the wall thickness of the heating tube body is limited to 2.8-3.2 mm; in addition, the tube-making process and the heating power of the high-temperature electrothermal alloy plate are compatible, the diameter of the hollow heating tube body is designed to be 60-65mm, and in a more preferable embodiment, the wall thickness of the heating tube body is limited to be 62-63.5 mm.

Referring to fig. 2, the connecting portion 18 of the connecting pipe 14 and the heating pipe 10 is fixed by circumferential seam full-weld welding; in another preferred embodiment, referring to fig. 3, the connection position of the connecting pipe 14 and the heating pipe body 10 is connected by a connecting sleeve 18 ', and both ends of the connecting sleeve 18' are respectively connected with the connecting pipe 14 and the heating pipe body 10 by full circumferential seam welding.

The utility model discloses an opening tip of electrical heating radiant tube is equipped with helicitic texture 142, can conveniently be connected and dismantle with the breather pipe, after heating furnace work, directly lets in cold air and cools off fast, compares with the cooling method of traditional electrical heating pipe along with the stove is cold, and the shortening cooling time that can be very big also reduces the high temperature period of electrical heating radiant tube, reduces the high temperature oxidation effect, prolongs the life of electrical heating radiant tube.

The electric heating radiant tube of the utility model directly adopts the electrothermal alloy to manufacture the hollow heating tube, the wall thickness of the tube fitting is about 3mm, compared with the original structure of adopting the sleeve and the built-in resistance wire, the weight of the material is only about 20 percent of the original weight, the material cost is obviously reduced, the material usage amount is greatly reduced, and the energy consumption required by heating is also obviously reduced; the electric heating radiant tube is characterized in that a hollow heating tube body made of electrothermal alloy is directly heated by electrifying, the temperature of the tube body is basically the same as the actual furnace temperature, no temperature gradient exists between the electric heating tube and the ambient temperature, compared with the existing electric heating radiant tube with built-in resistance wires, the hollow heating tube body is not required to be heated to a higher temperature to realize the required furnace temperature, the hollow heating tube is less influenced by high-temperature oxidation, the service life of the heating radiant tube is prolonged, the maintenance cost of a client is reduced, and the heating temperature of the radiant tube can reach 1000 ℃; moreover, because no obvious temperature gradient exists between the electric heating tube and the ambient temperature (furnace temperature), the control precision of the furnace temperature is ensured by controlling the temperature and the heating precision of the electric heating tube, and the temperature control precision is higher and can reach +/-5 ℃; compared with the original built-in resistance wire heating form, the improved radiant tube adopts a tube body with a larger heating area to directly heat, the heating power is obviously improved, and the power of a single radiant tube can reach about 17 KW; in addition, the electric heating radiant tube can be directly communicated with the air cooling tube for rapid cooling, and the surface load is obviously reduced (1.8W/cm)²Left and right), the heat dissipation is fast, and the high-temperature oxidation effect of the hollow heating pipe body of the electrothermal alloy is reduced.

The present invention is not limited to the above-described embodiments, and those skilled in the art can make modifications or changes without departing from the spirit of the present invention.

Claims

1. The U-shaped hollow tube electric heating radiant tube is characterized by comprising hollow heating tube bodies which are arranged in pairs, a connecting part which connects and penetrates one end part of each tube body into a U-shaped structure, and a connecting tube which is connected with the other end of each tube body, wherein the periphery of part of the connecting tubes is provided with a heat preservation section which is made of heat preservation materials, and a fixing plate which is used for fixing the heating radiant tube and a boiler is arranged at the joint of each connecting tube and the heat preservation section; the end part of the connecting pipe is provided with a thread structure; the connecting pipe is respectively provided with an electrode connecting terminal connected with the positive electrode and the negative electrode of the power supply; the hollow heating pipe body and the connecting pipe are in full-welding connection through circumferential seams, and the connecting part of the hollow heating pipe body and the connecting pipe is in full-welding connection with the connecting part of the hollow heating pipe body.

2. The electric heating radiant tube with U-shaped hollow tube as claimed in claim 1, wherein the wall thickness of said hollow heating tube body is 2.5-3.5 mm.

3. The electric heating radiant tube with U-shaped hollow tube as claimed in claim 2, wherein the wall thickness of the hollow heating tube body is 2.8-3.2 mm.

4. The U-shaped hollow tube electric heating radiant tube as claimed in claim 1 or 2, wherein the diameter of the hollow heating tube body is 60-65 mm.

5. The U-shaped hollow tube electric heating radiant tube as claimed in claim 4, wherein the diameter of the hollow heating tube body is 62-63.5 mm.

6. The electric heating radiant tube with U-shaped hollow tube as claimed in claim 1, wherein the connection between the connecting tube and the heating tube body is connected by a connecting sleeve, and the two ends of the connecting sleeve are respectively connected with the connecting tube and the heating tube body by full circumferential seam welding.