YIWU JINBAO HEATING PRODUCTS FACTORY

Functional editing

Small size and high power: The heater is mainly a clustered tubular electric heating element. The heat response is fast, the temperature control precision is high, and the comprehensive thermal efficiency is high. High heating temperature: The heater is designed for a maximum mission temperature of 850 °C. The medium outlet temperature is average and the temperature control accuracy is high. Wide use and strong compliance: The heater can be used in explosion-proof or popular places. The explosion-proof grade can reach dIIB and C, and the pressure can reach 20MPa. Long life and high reliability: The heater is made of extraordinary electric heating data, with low design power load and multiple maintenance, which greatly increases the safety and life of the electric heater. Fully active control: According to the requirements, the heater circuit design can conveniently complete the active temperature control of the outlet temperature, flow, pressure and other parameters, and can be networked with the computer. The energy saving result is obvious, and the heat generated by the electric energy is transmitted 100% to the heating medium.

A fluid explosion-proof electric heater is a type of electrical energy that is converted into heat to heat a material to be heated. In the mission, the low-temperature fluid medium enters its inlet and outlet under the pressure effect through the pipeline, along the specific heat exchange flow channel inside the electric heating vessel, and uses the path of fluid thermodynamics design to take away the high-temperature heat energy generated in the task of the electric heating element. The temperature of the heated medium is raised, and the electric heater outlet obtains the high temperature medium required by the process. The electric heater internal control system actively adjusts the electric heater output power according to the temperature sensor of the output port, so that the medium temperature of the output port is averaged; when the fever element is overheated, the self-powered overheating maintenance installation of the fever element immediately cuts off the heating power supply. To prevent the heating material from overheating, causing enthalpy change, coking, carbonization, and causing the burning of the heating element when severe, and extending the service life of the electric heater.

Leakage problem editing

Introduction of leakage of heating pipe and solution:

the reason

1. The ground wire is not connected;

2, electrical heating tube insulation damage (this may be the problem of insulating magnesium oxide powder, or joint insulation problems);

3. The electric heating tube burns out and the cup body is short-circuited;

4, improper cleaning, water hits the terminal of stainless steel electric heating pipe;

5, the circuit wire falls off and the cup body collides;

6. There is too much dirt on the electric socket or power plug;

7. The water quality is too bad, and the water pollution is serious;

Solution

1. Connect the ground wire as required and check if it is correct;

2. Check and repair if there is such an event, it is recommended to replace it;

3. The electric heating pipe has been damaged and replaced with the same specification electric heating pipe;

4. Clean and dry the stainless steel heating tube correctly;

5, check off the wire, re-weld;

6. Clean and dry properly;

Use range editing

Suitable for heating air, oil, water, chemical media, hot stamping, melting salts, alkalis and low melting alloys. It has the characteristics of high thermal efficiency, long service life, high mechanical strength, convenient installation, safety and reliability.

Category editing

1. According to the outlet mode, it can be divided into single-head electric heating tube and double-head electric heating tube.

2, according to the material classification, can be divided into stainless steel electric heating tube, quartz electric heating tube, Teflon electric heating tube, titanium electric heating tube

3, according to the shape classification, can be divided into straight electric heating tube, U-shaped electric heating tube, L-shaped electric heating tube, W-type electric heating tube, fin electric heating tube, special-shaped electric heating tube

4, according to the purpose of classification, can be divided into dry burning electric heating pipe and water burning electric heating pipe

5, according to the heating method classification, can be divided into conventional resistance heating tube and radiant electric heating tube

Select reference editor

Tubular electric heating elements (metal heating tubes) have achieved good results in the following departments and equipment applications after a long period of application practice.

 

1. Used to dry wood, paper, printing and dyeing, paint, etc., with finned heating tubes.

2. For the melting and heating of saltpeter and other salt substances, there is a dry heating tube.

3. Melting low melting point alloys, such as molten lead furnaces, tin melting furnaces, etc., with single-head heating tubes.

4. Building heating, electric heating film, etc.

5. Heat the flowing air and still air, and have a duct heating box.

6. Infrared radiation heating device, with far infrared heating tube (quartz, ceramic) products.

7. Low-temperature electric furnaces such as industrial electric furnaces for air circulation, electric ovens, etc.

8. Oil, water and other chemical liquids, heating devices in the plating bath, 316L heating tube, Teflon heating tube, titanium heating tube, etc.

9. Seawater electric distillation unit with 316L heating tube.

10. Alkali and acid heating devices, acid and alkali resistant heaters, etc.

11. In the food industry, baking of various breads, biscuits, and pastries, and electric heating devices in flowing water tunnels. In the plastic product processing and molding extrusion device and the rubber product molding vulcanization device, a single-head heating pipe, a uniform temperature electric heating pipe, and the like.

12. Medical sanitation equipment, such as sterilizers, sterilizers, etc., infrared heaters.

13. Heating, enameled wire drying device, etc. of motor vacuum dip coating equipment, finned electric heating tube, far infrared heating tube.

14. Various household electric heating appliances in daily life, such as electric stoves, electric ovens, rice cookers, electric frying pans, electric frying pans, water heaters, electric irons, etc., cast aluminum heating plates, double-head heating pipes, etc.

Computational power editing

First, the design calculation of the heating pipe is generally carried out in the following three steps:

1. Calculate the required power to heat from the initial temperature to the set temperature within the specified time.

2. Calculate the actual required temperature to maintain the temperature while maintaining the temperature of the medium.

3. According to the above two calculation results, select the type and quantity of the heater. The total power takes the maximum of the above two powers and considers the 1.2 coefficient.

formula:

1. Power required for initial heating

KW = ( C1M1 △ T + C2M2 △ T ) ÷ 864 / P + P / 2

Where: C1C2 is the specific heat of the vessel and medium (Kcal/Kg°C)

M1M2 is the mass of the container and medium (Kg)

ΔT is the difference between the required temperature and the initial temperature (°C)

H is the time required to heat the initial temperature to the set temperature (h)

Heat dissipation of the container at the final temperature of P (Kw)

2, maintain the power required to draw the medium temperature

KW=C2M3△T/864+P

Where: M3 increased media per hour kg / h

3. Heating pipe environmental performance curve

how to choose

1, the most common use of customers is stainless steel 304 material. The working environment is generally divided into dry burning and liquid heating. If it is dry burning, such as for oven, air duct heater, it can be made of carbon steel or stainless steel 304. If it is heated liquid, if it is water, use stainless steel electric heating tube. This stainless steel is generally made of stainless steel 304. If it is oil, it can be made of carbon steel or stainless steel 304. If it is a weak acid alkaline liquid, it can be made of stainless steel 316. If there is strong acid in the liquid, stainless steel 316, Teflon or even titanium tube should be used.

2. Determine the power of the heating tube according to the working environment.

The setting of power is mainly to dry the electric heating pipe and the liquid heating. If the dry burning is done, the pipe of one meter length is generally 1KW, and the liquid is heated. Generally, the pipe of one meter length is 2-3KW, and the maximum is not more than 4KW.

3. Select the shape of the heating tube according to the customer's electric heating equipment.

The shape of the stainless steel heating tube is ever-changing, the simplest is the straight rod, the U-shaped and then the shaped. The specific shape of the electric heating tube is adopted.

4. Determine the wall thickness of the heating tube according to the customer's use of the heating tube.

Performance curve for heating tube power calculation

Performance curve for heating tube power calculation

Generally, the wall thickness of the heating pipe is 0.8 mm, but according to the working environment of the heating pipe, for example, in the case of a large water pressure, a seamless stainless steel pipe having a thick wall thickness is required to fabricate the electric heating pipe.

5, when you buy, ask the manufacturer, the internal material of the heating tube

Why are the heating tubes a lot similar in appearance, and the price will have a big error? That is the internal material inside, the two most important materials inside are insulating powder and alloy wire. Insulating powder, quartz sand will be used poorly, and insulating modified magnesium oxide powder will be used. In addition, the alloy wire, generally iron chrome aluminum, according to the requirements and grades of pipe production, nickel-chromium alloy wire can be used. As the saying goes, a penny, a share of goods. Customers are advised not to be cheap, so as not to buy inferior products.

Cause of rupture

Reason one: During the filling process, the magnesium powder is mixed with impurities. After high temperature, these impurities will be carbonized. When the use is long, the tube will burst;

Reason 2: Material selection is very important. There are many kinds of stainless steel. According to the environment used by the heating pipe, the correct material is selected. The pipe itself has a difference. One is a seamed pipe, the other is a pipeless pipe, and the seamed steel pipe is welded with a steel belt. If there is a little welding, the tube will burst. Generally, there is no such problem, and it may be caused by the seam quality.

Reason three: stainless steel electric heating tube is also used to heat the liquid. Some are corrosive liquids, some are water. Heating water is sometimes the cause of water quality, because many of them may use ground water, or tap water, more impurities, and easy to scale. Too much scale is too thick, which can cause the internal temperature to not spread, causing the heating tube to burst. How to effectively remove scale, it is recommended to read the article "Recommended method for recommending scale of electric heating pipe";

Reason 4: The wall of the heating pipe is too thin or the power of the heating pipe is set too high, the surface load is too large, and the internal temperature is too high, which easily causes the internal expansion of the heating pipe, thereby causing the heating pipe to rupture.

Resistance confirmation

The most important part of the heating tube work is the work of the heating wire. The quality of the heating wire determines the quality of the heating tube. The study of the electric heating wire is to study the resistance value of the electric heating wire to determine the power of the electric heating tube. The resistance of the electric heating pipe is set, and the different working voltages are applied, and the effects of different electric heating pipes are generated, and the thermal effect is also the same. Generally, the smaller the resistance, the larger the wire diameter of the resistance wire, and the larger the current through which the resistance wire passes when the voltage is fixed. When the current passing exceeds the load of the resistance wire, it is prone to breakage and damage, and the data indicates the heating tube. The resistance is not as small as possible, and the appropriate resistance wire should be selected according to the actual situation and to ensure normal use.

The heating pipe resistance value is confirmed 2 points:

1. Determine the rated voltage and rated power to determine the resistance. By formula: voltage * voltage / power = resistance.

2. The surface load of the heating wire is not to exceed the standard, and generally cannot exceed 1.5w/cm²

When selecting the electric resistance tube production value, it is mainly based on the rated voltage and rated power provided by the customer. At the same time, we must also consider the bearing capacity of the surface resistance of the electric resistance wire. Thereby ensuring the service life of the electric heating pipe.

Testing standard

1. Power input test: power is applied at rated voltage, and the power deviation cannot exceed the following table.

Rated power input

Rated input power (W)

Deviation

deviation

W≦200

±10%

W>200

Positive deviation: +5% or 20W (whichever is greater)

Negative deviation: -10%

2. Electrical strength test:

a. Electric strength in cold state: It should be able to withstand 50Hz, 1min withstand voltage, cut off current 5mA, no breakdown, flashover phenomenon.

Rated voltage Test voltage 250V 1250V

b. Electrical strength at working temperature: withstand 50Hz, 1min withstand voltage, cut off current 5mA, no breakdown, flashover phenomenon.

Rated voltage Test voltage 250V 1000V

3. Leakage current at operating temperature

The electric heating tube is input at a rated power of 1.15 times under a fully exothermic condition, and the leakage current is 0.5 m A.

4, overload test

The electric heating tube is energized for 1 hrs at 1.27 times of rated power under full heat release conditions, and is cooled down to 0.5 hrs to room temperature (forced cooling is allowed), so that 30 cycles are repeated without damage.

5, electric heating tube shell sealing test (tube crack test)

Immerse the electric heating tube in acidified water (2%~3% hydrochloric acid, sulfuric acid or nitric acid) for 3hrs. The two ends of the electric heating tube should be exposed to at least 5mm, and the performance requirements of the second to third items should be met after the test.

6, sealing seal test

Place the electric heating tube in an environment with a temperature of 60 ° C and a humidity of 95% for 24 hrs. After placing it, it should meet the performance requirements of items 2 to 3.

7, life test

Under the condition of sufficient heat release, the electric heating tube is energized for 1 hrs at rated voltage, and cooled for 0.5 hrs to room temperature (allowing forced cooling), and the accumulated working time is 3000 hrs.

Fixed installation editor

In the use of mechanical heating equipment, the heating tube has a series that does not need to be fixed, and can be directly installed in the heating hole for heat transfer, such as a mold heating tube; of course, the heating tube also needs to be strengthened to make it more Stable to work properly, such as a single-head heating tube. Here we mainly discuss how to fix the heating tube and how to install it. We all know that fixing and installing the heating tube is a subtle and indispensable part to ensure its normal and stable work. In the absence of this link, there will be problems such as heating tube die-breaking, unstable work, and partial bare leaks, which may become accidents. . Common heating tube installation, fixing and the following analysis without fixing:

1, mold heating tube

The common mold heating tube does not need to be fixed, and is directly installed in the heating hole for heat transfer.

2, single head heating tube

The single-head heating tube has several types of common and L-shaped single-head heating tubes, baffle-type single-head heating tubes, and threaded single-head heating tubes.

(1) The common single-head heating pipe refers to a heating pipe without baffles, threads and other fixed ways. The installation method is: directly mounted on the bracket; after drilling, copper or other metal sheets are used for heating. The tube is fixed (similar to the baffle type electric heating tube); some are welded to fix the heating tube.

(2) The L-type single-head heating tube can be directly inserted and used in general use environment. It is not necessary to fix it according to the installation instructions.

(3) The baffle type heating tube may be used directly or welded on the basis of the baffle.

(4) The installation of the threaded single-headed pipe is to screw the heating pipe to the part that needs to be fixed. Usually, the liquid is heated by thread. Of course, the sealing requirement is also strict. Solder on the basis.

3, U-shaped heating tube, flange heating tube, fin heating tube

U-shaped heating pipes are normally equipped with fasteners, usually installed directly by fasteners. If fasteners are not used, they are usually fixed by brackets or welding.

The flange electric heating tube literally means that it is installed and fixed according to the mounting flange. The flange installation can be generally divided into a connecting flange (bolt fixing) and a welding flange. Usually, at low pressure or when the sealing requirements are not very high, the connecting flange can be used to fix the metal gasket by bolts through the original or post-processed bolt holes; in the case of high pressure or low pressure large diameter flange The flange can be mounted and fixed by welding using a welded flange.

It can be said that the basic double-head heating tube needs to be installed, and the fastener can be installed.

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