Squirrel cage electric radiation tube

Squirrel cage electric heating radiation tube is a heating element whose resistance wire (strip) is bent into a U-shape and strung into multiple insulated and high-temperature resistant ceramic support plates, with a heat-resistant rod fixed in the middle. The general effective length is 900-2400; General outer diameter of casing: 80-280. Single power: 2kw~40kw; Single voltage: 30v~220v. This type of radiation tube has a longer lifespan. Because its structure is similar to a squirrel cage, it is commonly known as a squirrel cage radiation tube. The full name of a squirrel cage radiation tube is a squirrel cage radiation tube heater or an axial corrugated cage cabinet heat radiation tube. Rat cage type heat radiation tube structure: 1. Wire mounted spiral wound electric radiation tube. This type of electric radiation tube consists of a heat-resistant alloy steel sleeve and a heater. The heater is generally composed of a 3-5 mm electric heating wire wound around a heat-resistant insulating ceramic tube core with a spiral groove, with a working voltage of 220V and a power of generally 5-7KW. 2. Belt shaped spiral wound electric radiation tube. The structure of this heater is basically the same as the first type, except that the heating element is wound with a resistance strip, which is generally 1-3 mm thick and 10-20 mm wide. The tube core is also composed of multiple grouped tube cores. Under the same surface load, the heat radiation surface is large and the material can be saved. Generally, high-power point heating radiation tubes adopt this form. 3. The structure of the axial twisted cage type electric heating radiation tube (commonly known as the squirrel cage type) is to bend the resistance wire (strip) of the heating element into a U-shape and string it into multiple insulated and high-temperature resistant ceramic support plates, with a heat-resistant rod fixed in the middle. The general effective length is 900-2400; General outer diameter of casing: 80-280. Single root .....

Squirrel cage electric radiation tube

A squirrel cage heat radiation tube is a heating element whose resistance wire (strip) is bent into a "U" shape and threaded into multiple insulated and high-temperature resistant ceramic support plates, with a heat-resistant rod fixed in the middle. The general effective length is 900-2400; General outer diameter of casing: φ 80~φ 280. Single power: 2kw~40kw; Single voltage: 30v~220v. This type of radiation tube has a longer lifespan. Because its structure is similar to a squirrel cage, it is commonly known as a squirrel cage radiation tube. The full name of a squirrel cage radiation tube is a squirrel cage radiation tube heater or an axial corrugated cage cabinet heat radiation tube.

Rat cage heat radiation tube structure

1. The spiral wound electric heating radiation tube with wire installation is composed of a heat-resistant alloy steel sleeve and a heater. The heater is generally made up of a φ 3-5 mm electric heating wire wound around a heat-resistant insulating ceramic tube core with spiral grooves. The working voltage is 220V and the power is generally 5-7KW.

2. The structure of the strip spiral wrapped electric heating radiation tube heater is basically the same as the first structure, except that the heating element is wound with a resistance strip. The thickness of the resistance strip is generally 1-3 mm and the width is 10-20 mm. The tube core is also mostly composed of multiple grouped tube cores. Under the same surface load, the heat radiation surface is large and the material can be saved. This form is generally used for high-power point heating radiation tubes.

3. The structure of the axial twisted cage type electric heating radiation tube (commonly known as the squirrel cage type) is to bend the resistance wire (strip) of the heating element into a "U" shape and string it into multiple insulated and high-temperature resistant ceramic support plates, with a heat-resistant rod fixed in the middle. The general effective length is 900-2400; General outer diameter of casing: φ 80~φ 280. Single power: 2kw~40kw; Single voltage: 30v~220v. This type of radiation tube has a longer lifespan.

The inner core of the squirrel cage electric radiation tube is composed of U-shaped axially arranged end welded resistance wires and ceramic support frames. There is no shielding between the inner core and the outer protective sleeve, and the heat dissipation is good. The rated working temperature of the electric radiation tube is 1000 degrees, and the material of the resistance wire is Cr20Ni80 or 0Cr21Al6Nb. The surface working temperature can reach 1200 degrees. The maximum working temperature of the electric radiation tube made of this material can reach 1000 degrees, and the support frame is made of high alumina ceramic parts. The outer protective sleeve is a cold drawn seamless thin-walled heat-resistant steel pipe made of 1Cr25Ni20Si2 or 1Cr25Ni35Si2. This material has good high-temperature oxidation resistance, high high-temperature creep strength, and certain resistance to carburizing. The design and material selection of this radiation tube have a high safety factor. The rated working temperature of the electric radiation tube is 1200 degrees, and the material of the resistance wire is 0Cr27Al7Mo2. The surface working temperature can reach 1400 degrees. The maximum working temperature of the electric radiation tube made of this material in a short time is 1250 degrees. The support frame is made of steel jade porcelain. The outer protective sleeve is a cold drawn seamless thin-walled heat-resistant steel pipe made of Fe Ni Cr Al Re alloy, which has ultra-high oxidation resistance. It can work for a long time at 1300 degrees Celsius in an oxidizing atmosphere and has short-term oxidation resistance at 1360 degrees Celsius. Suitable for working in high temperature, low oxygen partial pressure, and environments containing S and C. The electric radiation tubes designed and manufactured by our company are available in various specifications for high, medium, and low temperature furnaces, as well as special atmosphere furnaces. The outer sleeve system adopts seamless high-temperature resistant alloy pipes, plate rolled pipes, centrifugal cast pipes, non-metallic special anti carburizing sleeves, etc. And according to the use of radiation tube heating elements in various atmospheres and harsh cycling conditions, where general resistance alloys are not suitable. Company researchers have developed a new specialized material for resistance alloy radiation tubes. This material has stable performance, high resistivity, and low temperature coefficient, and is suitable for use in various radiation tube heating elements. It replaces expensive imported materials with unique performance.

Characteristics of squirrel cage heat radiation tube:

1. Made from high-quality raw materials and seamless cold drawn heat-resistant steel pipes (with a maximum temperature of 1200 degrees)

2. The inner core adopts a U-shaped axial arrangement of resistance wires and end welding method

3. The resistance wire and ceramic frame are basically unshielded, and the temperature difference between the resistance wire and the furnace is small

4. The maximum working temperature is 1000 degrees or 1200 degrees

5. The biggest advantage of the radiation tubes produced by Chengchi Industrial Furnace is the use of seamless cold drawn, thin-walled heat-resistant steel tubes (1Cr25Ni20Si2 or 0Cr25Ni20Si2), which have a 10% higher thermal radiation than similar products

6. The electric heating alloy material used for radiation tubes with a duration of over 8000 hours should have high electrical resistivity and high electric heating conversion rate. Due to the placement of the radiation tube inside the casing, the heat transfer process is different from that of general exposed electric heating elements. Its heat shielding is large, and the temperature of the element must be controlled during the heating process to prevent overheating. When the radiation tube is closed for heating, the surface temperature of the electric heating element is about 100 ℃ -150 ℃ higher than the furnace temperature. So when selecting materials, it is necessary to analyze the furnace temperature, the temperature atmosphere inside the furnace, and choose the correct heating material.