阅读说明：本技术 一种加热装置 (Heating device ) 是由 董文利 于 2020-06-29 设计创作，主要内容包括：本发明公开了一种加热装置,包括绝缘层、加热组件、硬质保温层、软质保温层,保温外壳,该加热装置从内层到外层,依次为绝缘层、加热组件、硬质保温层、软质保温层、保温外壳,加热组件位于绝缘层上并列排放绝缘层平面上,保温层位于加热组件上并列排放加热组件,所述保温外壳位于保温层上并覆盖保温层。本发明具有较好的节能效果,本发明的加热装置用于工业类的加热,如挤出机的沥青机、熔铅机、浆纸电加热板、工业方管道、方形平面箱体加热等。(The invention discloses a heating device which comprises an insulating layer, a heating assembly, a hard insulating layer, a soft insulating layer and an insulating shell, wherein the insulating layer, the heating assembly, the hard insulating layer, the soft insulating layer and the insulating shell are sequentially arranged from the inner layer to the outer layer of the heating device, the heating assembly is positioned on the insulating layer, the insulating layer is arranged on the insulating layer in parallel, the heating assembly is arranged on the heating assembly in parallel, and the insulating shell is positioned on the insulating layer and covers the insulating layer. The heating device has a good energy-saving effect, and is used for heating industries, such as an asphalt machine of an extruder, a lead melting machine, a pulp paper electric heating plate, an industrial square pipeline, a square plane box body and the like.)

1. A heating device, characterized by: the heating device comprises an object to be heated, an insulating layer, a heating assembly, a nano hard insulating layer, a nano soft insulating layer and an insulating fixing plate from an inner layer to an outer layer, wherein the object to be heated, the insulating layer, the heating assembly, the nano hard insulating layer, the nano soft insulating layer and the insulating fixing plate are sequentially arranged from the inner layer to the outer layer; the nano soft insulating layer is positioned on the upper surface of the nano hard insulating layer; the thickness of the insulating layer is 0.1mm-10 mm; the heating voltage adopted on the heating component is 1V-110V.

2. A heating device according to claim 1, characterized in that: the heat insulation fixing plate is positioned on the upper surface plane of the nano hard heat insulation layer or the upper surface of the nano soft heat insulation layer; the heating section is composed of a plurality of strips of electrically conductive material.

3. A heating device according to claim 2, characterized in that: the heating element comprises a plurality of first square and rectangular plane conductive assemblies and a plurality of second square and rectangular plane conductive assemblies, wherein the plurality of first square and rectangular plane conductive assemblies and the plurality of second square and rectangular plane conductive assemblies are connected in parallel through connecting parts, or the plurality of first square and rectangular plane conductive assemblies and the plurality of second square and rectangular plane conductive assemblies are respectively and independently connected.

4. A heating device according to claim 1, characterized in that: the heating assembly is characterized by further comprising a transformer for applying voltage to the heating assembly, wherein the transformer is an isolation transformer.

5. A heating device according to claim 1, characterized in that: the insulating layer is made of one of mica paper, high silica woven fabric, glass fiber product, ceramic fiber product and mineral product.

6. A heating device according to claim 1, characterized in that: the nano hard insulating layer is made of one of a nano hard material, an aluminum silicate standard material and an aerogel standard material; the nano soft heat-insulating layer is made of one of a nano soft material, an aluminum silicate standard material and an aerogel standard material.

7. A heating device according to claim 2, characterized in that: the heating section is made of metal materials and alloy materials; the heating section is made of one of 904l stainless steel, 310s stainless steel, 304 stainless steel, aluminum alloy, iron-aluminum alloy and nickel-chromium alloy.

8. A heating device according to claim 1, characterized in that: the thickness of the insulating layer is 0.1mm-10 mm; the voltage applied to the heating component is 5V-90V; the heat-preservation fixing plate is made of one of alloy, steel plates, galvanized materials and stainless steel materials.

9. A heating device according to claim 3, characterized in that: the connecting part comprises one of screw connection, hole drawing riveting, clamping hook connection and hinge connection.

10. A heating apparatus according to claims 1 to 9, characterized in that: the heating device is used for an asphalt furnace; a lead melting furnace; forming an electric heating plate by using pulp paper; industrial square and rectangular cubic pools, containers and pipelines; all objects to be heated are square, rectangular, round and irregular plane.

Technical Field

The invention provides a heating device, in particular to industrial heating, such as pulp paper electric heating plates, square box body water pool electric heating, industrial square and rectangular pipelines and all irregular plane surfaces of objects to be heated.

Background

Most asphalt machines and lead melting machines on the market at present still adopt resistance-type electrothermal tubes, the resistance-type electrothermal tubes produce heat based on the electric current heat effect, namely when the electric current passes through the conductor, the resistance of the conductor has the effect of hindering the electric current, and the electric current will overcome the resistance of the conductor and will do work, just also convert the electric energy into heat energy, and transmit through the mode of conduction, so need with the inner wall of heating pipe and the outer wall reliable contact of box just can transmit heat energy to the box on, and the heat of heating pipe outer wall is mostly dissipated to the air, cause the thermal efficiency to descend, ambient temperature rises, cause the energy consumption higher. The temperature gradient between the resistance wire and the box body is large, the surface temperature of the heating ring is high, and scalding is easy to happen. In addition, resistance-type heating pipe is because the resistance wire generates heat, and heating power is less, and its heating temperature can be about 300 ℃, if when needing higher temperature, then need increase surface power density, just so can make the resistance wire age fast under the high temperature and blow, so resistance-type heating pipe needs the unscheduled change, and life is lower, is about 6 months.

Therefore, the conventional heating device has the disadvantages of the resistance wire heating mode:

(1) the heat loss is large, the heating adopted by the existing asphalt machine is made of resistance wires, the inner surface and the outer surface of the ring generate heat, the heat of the inner surface (the part tightly attached to the charging barrel) is conducted to the charging barrel, and most of the heat of the outer surface is dissipated into the air, so that the loss and the waste of electric energy are caused;

(2) ambient temperature rise: because a large amount of heat is dissipated, the ambient temperature is increased, particularly the production environment is greatly influenced in summer, the field working temperature exceeds 45 ℃, and some enterprises have to adopt air conditioners to reduce the temperature, which causes secondary energy waste;

(3) short service life, the maintenance volume is big: because the resistance wire is adopted for heating, the heating temperature is as high as about 300 ℃, the resistance wire is easy to burn out due to high-temperature aging deformation, the resistance wire is not easy to replace after being burnt out, the service life of a common electric heating ring is about half a year, the production is often influenced, and the maintenance workload is relatively large;

(4) the power density is low, and the power density cannot be adapted to occasions requiring higher temperature;

(5) the temperature control precision is reduced, the temperature is easy to overshoot by more than 10 ℃, and the temperature control is inaccurate.

The other improved generation is electromagnetic induction heating, and the working principle of the electromagnetic induction heating is that the electromagnetic induction heating works by utilizing the magnetic field induction eddy current heating principle. The input power frequency 50Hz/220V alternating current is converted into 315V direct current through the rectifying circuit, the direct current is converted into high-frequency current with the frequency of 20-35 kHz through the control circuit, the high-frequency current can generate a high-speed changing magnetic field when passing through the coil, and countless small eddy currents can be generated in the metal body when magnetic lines of force in the magnetic field pass through the metal, so that the metal can automatically generate heat at a high speed. The electromagnetic induction device for heating the charging barrel of the injection molding machine is generally composed of a heat insulation material, an electromagnetic coil, a shield and the like, as shown in fig. 1.

The electromagnetic induction heating coil body does not generate heat, and can wrap up the insulation material of certain thickness in the feed cylinder outside in the in-service use, and the surface temperature of electromagnetic induction heating coil is below 60 ℃, and the inside heat of feed cylinder only radiates to the air in a trace amount, and heat energy loss can greatly reduced like this, has improved the thermal efficiency, and consequently energy-conserving effect is showing. However, the high-frequency current passing through the coil generates a high-speed alternating magnetic field, and when the magnetic field strength reaches a certain amount, the high-speed alternating magnetic field can cause damage to the central nervous system of the human body. For example, an asphalt machine is used as a test prototype, the asphalt machine is provided with three electromagnetic induction heating rings, the rated power of each section is 2.25kW, the test is carried out by electrifying the asphalt machine section by using an electromagnetic field analyzer ELT-400 according to the method for measuring the electromagnetic field of EN62233-2008, and the test data are shown in Table 1.

TABLE 1 magnetic flux value of certain electromagnetic induction heating coil

Analysis of the test data in Table 1 revealed that: when the electromagnetic heating coils are respectively electrified one by one, the magnetic flux density is measured to be smaller, and if more than two sections of heating coils are electrified simultaneously, the magnetic flux density is found to be remarkably increased, the weighted value W reaches 1.804, and the value is required to be less than 1 according to the specification of the European Union EN62233 standard, so that the standard can be considered to be not met. However, at present, domestic electromagnetic equipment for household and similar appliances is only specified, and relevant standards of electromagnetic equipment designed for industrial application are not provided. Manufacturers of electromagnetic induction heating coils only carry out EMF test on the periphery of a single heating coil according to European Union standards, but detection is carried out under actual working conditions, the electromagnetic radiation intensity of the electromagnetic heating coil is still high, and uncertain dangers exist.

Because the electromagnetic induction heating coil adopts an electronic rectifying device and a high-power IGBT, higher harmonics can be generated, harmonic pollution exists on a power grid, the voltage and current waveforms of the power grid are distorted, and the power loss of the power grid is increased, the service life of equipment is shortened, and unsafe operation is caused. In addition, the temperature sensor can also have adverse effects on peripheral precise instruments, such as a temperature thermocouple, a displacement sensor and an injection molding machine controller, and the phenomena of temperature fluctuation, position jumping, controller failure and the like can occur. The electromagnetic induction heating ring is characterized in that high temperature is generated only inside the metal to be induced, the temperature of the heating ring body is low, the electric loss of the heating ring body is small, the service life of the heating ring cannot be influenced even if the heating power is large, but the box body of the asphalt machine is provided with a plurality of heating zones, each heating zone is respectively provided with the heating ring and an electromagnetic induction controller, a plurality of electromagnetic coils are wound on the box body, when the current flowing through the electromagnetic coils changes, the changed magnetic flux can enable the coils to generate induced electromotive force, namely self-induced electromotive force, mutual-induced electromotive force also exists between two adjacent electromagnetic coils, the self-induced electromotive force and the mutual-induced electromotive force exist, the synchronous circuit of the controller is directly disordered, the electromagnetic induction controller is often burnt out, and the service life is generally about 1 year. The electromagnetic induction heating coil utilizes the magnetic field induction eddy current heating principle, and the feed cylinder that is heated generates heat through self electric current, and the heat is by the whole production of box, and the heating is rapid, and the inside and outside temperature of feed cylinder is unanimous basically, and temperature control is real-time accurate. However, if used in systems above 200 degrees celsius, the temperature tends to overshoot by more than 15 degrees celsius, so temperature sensitive plastics are not suitable.

Therefore, the heating device of the resistance type electric heating ring in the prior art has high energy consumption, poor temperature control precision and short service life, and although the heating device of the electromagnetic induction heating has better energy-saving effect, the heating device also has more defects: 1) the electromagnetic radiation intensity of electromagnetic heating is still high, and the human health can be possibly endangered; 2) Harmonic pollution exists on the power grid, so that voltage and current waveforms of the power grid are distorted, power loss of the power grid is increased, service life of equipment is shortened, and unsafe operation is caused; 3) the service life is short. For this reason, a corresponding technical scheme needs to be developed for solution.

Disclosure of Invention

The invention aims to solve the technical problems in the prior art and provides a heating device with a better energy-saving effect.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

the technical scheme adopted for solving the technical problems in the prior art is as follows: a heating device comprises an insulating layer, a heating assembly, a hard insulating layer, a soft insulating layer and an insulating shell, wherein the insulating layer, the heating assembly, the hard insulating layer, the soft insulating layer and the insulating shell are sequentially arranged from the inner layer to the outer layer;

the heating assembly comprises a heating section, the heating section comprises a plurality of flat strip-shaped conductive strips, and the current carrying capacity flowing through the conductive strips is not more than 4A/mm 2;

when the heating device is used for heating an object to be heated, the object to be heated is placed in an insulating layer of the heating device, namely the insulating layer is positioned on the object to be heated and is arranged on the surface plane of the object to be heated in parallel;

during construction, corresponding parts of the heating device can be installed on site, for example, the heating device is installed on a heating object on site, for example, when a box body of an asphalt machine needs to be heated, the heating device is directly installed on the box body;

the heating assembly further comprises a supporting section, the heating section is connected with the supporting section, the heating section and the supporting section form a first sheet and a second sheet, and the first sheet and the second sheet are fixedly connected through a connecting part. The heating section and the supporting section can be integrally formed in the manufacturing process or welded after being manufactured respectively;

preferably, the heating section and the supporting section are integrally formed in the manufacturing process;

the connecting part comprises one of bolt connection, hole drawing riveting, clamping hook connection and hinge connection.

As an improvement of the technical scheme, the connecting parts are connected by bolts.

As an improvement of the above technical solution, the heating apparatus further includes a transformer for applying a voltage to the heating element.

As an improvement of the above technical solution, the transformer includes an isolation transformer.

As an improvement of the technical scheme, the thickness of the insulating layer in the heating device is 0.2 mm-5.0 mm.

As an improvement of the technical scheme, the thickness of the insulating layer is 0.2 mm-3.0 mm.

As an improvement of the technical proposal, the material adopted by the insulating layer comprises one of high silica textile cloth, mica paper, glass fiber products, ceramic fiber products, mineral products or the combination of the high silica textile cloth, the mica paper, the glass fiber products, the ceramic fiber products and the mineral products or other similar materials.

As an improvement of the technical scheme, the material adopted by the heat-insulating layer comprises one of or a combination of an aluminum silicate needle-punched blanket, an aluminum silicate fiber standard material and an aerogel felt or other similar materials.

As an improvement of the technical proposal, the material of the heat preservation shell comprises one of galvanized material and stainless steel material or the combination of the galvanized material and the stainless steel material or other similar materials.

As an improvement of the technical scheme, the heating assembly is loaded with 10V-110V of voltage.

As an improvement of the technical scheme, the voltage loaded on the heating assembly is 10V-70V.

As an improvement of the technical scheme, the heating section adopts the conductive strip material comprising a metal material, an alloy material or other similar materials.

As an improvement of the technical scheme, the material of the heating section adopting the conductive strips comprises one of 904l stainless steel, 310s stainless steel, 304 stainless steel, aluminum alloy, iron-aluminum alloy and nickel-chromium alloy.

As an improvement of the above technical solution, the width of the conductive strip in the heating zone is 5.0mm, and the thickness of the conductive strip is 0.15 mm; preferably, the width of the conductive strips in the heating belt is 5.0 mm-50 mm;

as the improvement of the technical scheme, the thickness of the conductive strip in the heating belt is 0.15-30 mm.

As an improvement of the above technical solution, the distance between the conductive strips in the heating belt is 5.0mm, the distances between the conductive strips may be the same or different, and when the temperature sensor needs to be installed on the heating cylinder, the distance between the strip-shaped conductive materials is greater than the distances between other positions at the installation position of the sensor, and the main purpose is to leave the installation position for the temperature sensor.

As a modification of the above technical solution, when heating an object to be heated, referring to fig. 6, a power source is applied to the support section a and the support section B on the heating assembly, since the support section is connected to the heating section, assuming that a current direction at this time flows from the support section a to the heating section through the heating section B, since the heating assembly fastens the first sheet and the second sheet by a connection component (e.g. a bolt), the bolt connects their corresponding conductive strips, such as the connection of the bolt 1, the bolt 2, and the bolt 3, the first sheet voltages of which are respectively U11, U21, U31, and the voltage at the connection of the second sheet is U12, U22, U32, since the first sheet and the second sheet of the bolt are very short distances and are made of conductive metal materials, the potential at this time is considered to be U11, U12, U21, U22, U31, U32, … …, that is considered to be equal to the potential at the first sheet and the second sheet of each bolt, the mode is called as equipotential connection, and by adopting the equipotential connection mode, because the potentials at two ends of the bolt connection are equal, no potential difference exists, the bolt connection does not generate heat during heating, so that the energy consumption is saved, and because the bolt does not contact with a heated object, if the bolt generates heat, the heat is consumed, and the heating effect cannot be achieved; on the other hand, when high temperature heating, because the generating heat of bolt itself makes it produce deformation, damages the bolt, is unfavorable for work such as maintenance, dismantlement and the change busbar of heating zone in the future.

After improvement, the invention has better energy-saving effect, and the heating device of the invention is used for heating in industries, such as an asphalt machine of an extruder, a lead melting machine, a pulp paper electric heating plate, an industrial square pipeline, a square plane box body and the like.

Compared with the prior art, the invention has the following implementation effects:

(1) by adopting the technical scheme, compared with the existing resistance wire heating device, the resistance wire heating device can greatly save energy consumption, the saving proportion is at least more than 30%, the original resistance wire heating device adopts heating voltage of 380V or 220V of alternating current, the requirement on the thickness of an insulating layer is thicker, and an object to be heated can be heated to 200-300 ℃ only when the temperature of a heating material is up to 500-600 ℃, so that the energy consumption is high; on the other hand, higher voltage has the danger of electric leakage and electric shock, the lower the voltage grade, the lower the requirement on the insulating material, the insulating material is generally heat-insulated and is not beneficial to the transmission of heat, so the thinner insulating layer can improve the heat transfer efficiency, can avoid the heating body from being in a high-temperature state for a long time, and indirectly improve the service life of the heating body, the invention adopts low-voltage heating, if 20V voltage heating can be adopted, the insulating material can be very thin, such as 0.2m m, 0.3mm and the like, the temperature of the heating section is low and close to the working temperature, the heat transfer speed is extremely high, the heating and the heat absorption of the object to be heated basically reach 1 to 1, and the better heating effect can be achieved only by needing less heat without heat waste; in addition, the low-voltage isolation transformer is adopted, so that the safety is high, and the electric shock danger can not be generated even if the electric leakage occurs. The low-voltage heating can save the power cost, so that the electric heating furnace is more economical and practical.

(2) The heating tape comprises a plurality of flat strip conductive strips, the current carrying capacity of the conductive strips is not more than 4A/mm2, the heating tape needs to be electrified and heated for a long time so as to heat a heated object, when the current carrying capacity is too high, the conductive strips can be fatigued, the heating performance is deteriorated, even the conductive strips can be damaged, and the service life of the heating device is shortened.

(3) The heating assembly is adopted to replace the resistance wire heating ring, a heating section and a supporting section are adopted, the supporting section is connected with the heating section, the heating section is started to transfer heat and is tightly attached to an insulating layer to heat an object to be heated, and the supporting section maintains mechanical strength and transfers current; because the conducting strip of the many strips of heating section is made, compare the heating methods of resistance wire, the radiating problem of circular heating pipe (for example, single-end electrothermal tube, resistance wire) has been improved to a certain extent to the conducting strip, circular electrothermal tube or resistance wire are the point contact with the heating object surface, the heating strip is face-to-face contact, the laminating degree is high, heated area is big, the conducting strip can be hugged closely with the insulating layer, area of contact increases for rate of heating is fast, the heat loss is few, energy saving consumed the festival.

4) Heating element simple to operate, long service life, for quick easy to assemble, divide into first piece and second piece with heating element, then can be with the quick connection of first piece and second piece through coupling assembling, like the bolt, screw connection, take out the hole riveting, the pothook is connected, hinged joint, in order to avoid coupling assembling to be heated to take place to warp the damage, the electric potential of junction has been designed and has equaled, the potential difference does not promptly, do not produce the heat, avoid coupling assembling to be heated to take place to damage, from certain angle energy saving consumption.

5) The working environment of the heating device is improved, the working temperature of a workshop is reduced, the working environment of the summer workshop is severe due to the heat dissipated by traditional heating, and the heating device adopts double-layer high-heat-insulation coefficient materials and the heat-insulation shell, so that the dissipated heat is strictly insulated, energy is saved, the working environment of the summer workshop is improved, and the problem that the temperature of the summer workshop is too high due to the heating of the existing resistance wire is solved.

6) The temperature control device is completely compatible with the original temperature control system, the heating temperature rise is fast during working, the heat preservation precision is accurate, the temperature can be controlled within +/-1 ℃, the rejection rate is reduced, and the product quality is improved.

7) Compared with the existing electromagnetic induction heating coil, the technical scheme of the invention has no electromagnetic pollution, does not endanger human health, and does not have harmonic pollution to the power grid, so that the voltage and current waveforms of the power grid are distorted, and the power loss of the power grid is increased; through practical application, the technical scheme of the invention is good in use when the laboratory runs for 3 years at present. Theoretically, the method can be implemented for 10 years without damage.

Drawings

FIG. 1 is a schematic view of a heating apparatus according to the present invention;

FIG. 2 is another schematic view of the heating apparatus of the present invention;

FIG. 3 is a schematic perspective view of a heating assembly according to the present invention;

FIG. 4 is a schematic diagram of an equipotential junction according to the present invention.

100-a device to be heated; 101-thermal insulation material; 102-a solenoid coil; 103-heat preservation fixing plate; 200-a device to be heated; 201-an insulating layer; 202-a heating assembly; 202-1: a second sheet of heating elements; 202-2: a second sheet of heating elements; 203-insulating layer; 204-heat preservation fixing plate; 303-insulating layer; 303-1: reserving a hole; 304-heat preservation fixing plate; 304-1: reserving a hole; 21-heating section (composed of multiple conductive strips); 22-a support section; a-a support section; b-support section, U11-Voltage of bolt 1 on first sheet; u12 — voltage of bolt 1 on second sheet; u21-voltage of bolt 2 on first plate; u22 — voltage of bolt 2 on second sheet; u31-voltage of bolt 3 on first plate; u32-voltage of bolt 3 on second sheet.

Detailed Description

The present invention will be described with reference to specific examples.