KR200286913Y1 - Induction heating roll using for three-phase ac source - Google Patents

Abstract

The present invention is provided with a plurality of heat rolls in the longitudinal direction in the central portion of the cylindrical body 12 consisting of an induction part 20 for dissipating heat, the surface of the heat roll 10 and the induction part 20 Convection phenomenon of the plurality of heat transfer spring holes 16 penetrating in the longitudinal direction on the circumferential surface and the heat transfer solution 18 inserted into the heat transfer spring holes 16 and filled in the heat transfer spring holes 16. The present invention relates to an induction heating roll composed of a thermoelectric spring (19) which efficiently transfers heat by facilitating heat transfer. In particular, a three-phase AC power supplied to the induction coil (23) of the induction part (20) is star-connected. By individually controlled using SCR (Silicon Controlled Rectifier) by the method or ring-connection method, the surface temperature is changed according to the surface position of the heat roll 10 and the post-treatment work, that is, the surface of the fabric on It is effective to simultaneously wrinkle or change the color of the fabric.

Description

INDUCTION HEATING ROLL USING FOR THREE-PHASE AC SOURCE}

The present invention uses a low frequency induction coil as a heat source for a heat roll using a calender machine, and has a plurality of heat transfer spring holes having a high thermal conductivity and a thermoelectric spring along the inner circumferential surface of the heat roll. In the induction heating roll that reduces heat loss during calendering and changes the diameter of the heat transfer spring hole at regular distances, thereby providing convenience in finishing fabrics such as fibers, the amount of power of the three-phase AC power supplied to the induction unit is determined. The present invention relates to an induction heating roll using a three-phase AC power supply that precisely controls the surface temperature of the heating roll by controlling the SCR by a connection or annular connection method.

Commonly referred to as a calender machine is a general-purpose machine that polishes all kinds of fabrics and knit fabrics and narrows them to soften the touch, or in the production of nonwovens and films, the thickness of nonwoven and film surfaces with heat and pressure. It refers to a machine that processes constantly.

Heat roll (Heating roll) is used in the calender machine as described above. The heat roll is heated by embedding a heater in the longitudinal direction in the center or heating the oil heated in the longitudinal direction in the center.

However, such a conventional heat roll is made of steel, which is a single material, and the thickness from the center portion to the surface is so thick that heat transfer from the center portion to the surface is poor, so that the temperature difference between the heater part and the heat roll surface is large, resulting in a shorter heater life. Since the temperature of the heating oil must be higher than necessary, there were many problems of heat loss.

In addition, such a conventional hot roll can only be calendered, and at the same time as the calendering, the post-treatment work, for example, the wrinkles on the surface of the fabric or the surface temperature of the hot roll can be changed depending on the position of the surface. There is a limit that cannot work such as making a change.

On the other hand, the power source used in the conventional heating roll generally uses one phase alternating current (AC) power, the one phase alternating current of the induced electromotive force generated in each part by the interval, the number of times, etc. Due to the difference, since the amount of heat generated on the surface of the heat roll is different, there are disadvantages of having to test and re-wound several times, and there is a problem of severe power unbalance by using an AC power in one phase.

The present invention has been made to solve the above problems, by controlling a plurality of induction coils inserted into the inside of the thermal rolls individually through the SCR enables precise temperature control of the thermal rolls and various post-treatment operations using the thermal rolls. The purpose of the present invention is to increase the heat transfer efficiency of a heat roll by providing a plurality of heat transfer spring holes with a high thermal conductivity and a thermoelectric spring on the circumferential surface between the center and the surface.

1 is a schematic view showing the electron induction action that is a principle of heat generated in the induction heating roll according to the present invention,

Figure 2 is a partial cross-sectional view schematically showing the structure of the induction heating roll according to the present invention,

3 is a right side view schematically showing the structure of the induction heating roll according to the present invention,

4A is a circuit diagram schematically illustrating a star connection method of an induction unit controlled by an SCR as an embodiment of the present invention;

Figure 4b is a circuit diagram schematically showing an annular connection method of the induction unit controlled by the SCR as another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: heat roll 11: mounting portion

12: main body 13: heater pipe

14: Hita shaft 16: heat transfer spring hole

17: steam pipe for straightening the roll 18: heat transfer liquid

19: thermoelectric spring 20: induction part

21: core steel plate 22: insulated mica

23: guide coil 24: SCR

30: temperature sensor 31: temperature sensor holder

32: temperature sensor hole

Hereinafter, the present invention will be described in detail by the accompanying drawings.

1 is a schematic view showing the electromagnetic induction action that is the principle of the heat generated in the induction heating roll according to the present invention, Figure 2 is a partial cross-sectional view schematically showing the structure of the induction heating roll according to the present invention, Figure 3 Is a right side view schematically showing the structure of the induction heating roll according to the present invention, Figure 4a is a circuit diagram schematically showing the star connection method controlled by the SCR as an embodiment of the present invention, Figure 4b is the present invention As another embodiment of the present invention, a circuit diagram schematically illustrating an annular connection method of an induction unit controlled by an SCR.

The present invention is a heat roll consisting of a cylindrical body, as shown in Figure 2 is sealed in a state in which the thermoelectric fluid and the thermoelectric spring mounted and penetrated in the longitudinal direction on the circumferential surface between the surface and the induction portion of the heat roll By adjusting a plurality of heat transfer spring holes (holes), a plurality of induction parts that are in close contact with the outer diameter of the heater pipe provided in the center of the heat roll and generates heat by an electromagnetic induction action, and the power supplied to the induction parts SCR for controlling the temperature distribution of the surface of the heat roll, a heater shaft coupled to the heater pipe and serving as a central axis when the heat roll rotates, and a temperature sensor provided at one side of the heater shaft and detecting a temperature of the heat roll. And a plurality of spaces longitudinally penetrated on the circumferential surface between the heat transfer spring holes and other adjacent heat transfer spring holes. It is inserted into the roll calibration steam tube filled with distilled water, the heat transfer liquid filled in the heat transfer spring hole and having a constant expansion coefficient, and the heat transfer spring hole filled with the heat transfer liquid. It consists of a thermoelectric spring which promotes circulation of the thermoelectric fluid by convection and steam effects.

The induction unit 20 uses an induction coil as a heat source for dissipating heat through low frequency induction heating, and the principle of low frequency induction heating used in the present invention is as follows.

Induction heating refers to a method of heating a conductive object in the middle of a changing magnetic field. The heated object does not necessarily need to be a magnetic material, but the heated object must be conductive. Many ferrous and nonferrous materials can be heated or dissolved by induction. Direct induction heating or melting is only possible with conductive materials because they are generated by the EDDY CURRENT.

That is, as shown in FIG. 1, the magnetic force line generated by the Eddy Coil penetrates in the metal object and generates a force to block the magnetic force line change in the metal object by electrical reaction. In other words, the electromotive force in the opposite direction to the current of the coil is induced in the metal object. This phenomenon is called an electromagnetic induction action.

In addition, EDDY CURRENT LOSS is a current generated by the material acting as a secondary circuit of the transformer and is induced in the center. When all conductive materials are placed in the middle of the changing magnetic field, the eddy current Flow. That is, when alternating magnetic flux is generated in the conductor, induction electromotive force is generated in the conductor. The current generated by this electromotive force is called eddy current. When this eddy current flows in a conductor with a certain resistance, JOUL heat is generated in the conductor, which is called eddy current loss. .

If the eddy current flows along the surface of the conductor and a cross section perpendicular to the current of the conductor is considered, the amount of current passing through the unit area of the cross section, that is, the current density is not the same as that of the conductor, and the closer to the surface, the more the current density The phenomenon that the current density decreases from the large surface to the center is called the skin effect. The epidermal effect is related to frequency, and the higher the frequency, the greater the epidermal effect. In the present invention, the epidermal effect is extremely low because the low frequency is used.

On the other hand, the low frequency is a classification based on the frequency of electromagnetic waves, and usually refers to 10 kHz or less. Similar to the audio (voice) frequency. At low frequencies, the radiation of electromagnetic waves is small, the dielectric loss and the skin effect are small, and measurement techniques are well established.

In the present invention, low frequency induction heating means an induction heating method operating at a commercial frequency of 60 V at a commercial frequency of 100 V and 200 V. The commercial voltage is 380 V, a three-phase AC voltage commonly used in a general factory. In the case of 50Hz, the operating frequency at 440V, the same meaning is used.

In addition, the convection phenomenon is one of the three transfer processes of heat (the other two are conduction and radiation), and means a phenomenon in which a fluid moves upside down due to heat. The solution is heated evenly throughout.

As shown in Figures 2 and 3, the heat roll 10 according to the present invention is provided with a cylindrical body 12, the end surface of the main body 12 so that the heat roll 10 can be installed This reduced installation part 11 is formed.

A plurality of induction parts 20 are formed in the center portion of the body 12 of the heat roll 10 in the longitudinal direction, and the induction part 20 continuously generates heat to heat the heat roll 10 at a constant temperature. Keep it at

Induction unit 20 according to the present invention is in close contact with the outer diameter of the heater pipe 13 in one embodiment is installed three at a predetermined distance, the number of induction unit 20 can be adjusted if necessary. .

The induction part 20 is wrapped with the insulating mica 22 in a state in which the core steel plate 21 is provided on the inner side, and the induction coil 23 is wound on the outside thereof, and the core steel plate is caused by an induction current. In order to prevent the magnetization of 21, one side of the core steel plate 21 is spaced apart while maintaining a constant heater gap.

In addition, as an embodiment of the present invention, there are provided six heat transfer spring holes 16 in the longitudinal direction on the circumferential surface between the surface of the heat roll 10 and the induction portion 20, the heat transfer spring holes 16 ) Can be adjusted to an appropriate number in the manufacturing process according to the diameter and the working conditions of the heat roll 10, as another embodiment of the present invention constitutes a separate space and made of a material having a higher thermal conductivity than the body 12 in the space You can also use a method of inserting a pipe.

On the other hand, in general, the heat roll 10 will be bent or twisted due to thermal expansion when the heat continuously receives a predetermined temperature or more, the induction heat roll according to the present invention between the heat transfer spring hole 16 and the other heat transfer spring hole 16 Since the steam pipe 17 for the roll correction to perform the pressure control function is inserted, it is possible to minimize the deformation (10) of the heat roll.

That is, the roll calibration steam pipe 17 is mounted therein to distilled water to mitigate the expansion of the heat roll by the heat transferred from the induction unit 20, the induction heat roll according to the present invention is shown in FIG. As shown there are six roll calibration steam tubes 17.

In addition, an air adjusting screw (not shown) is separately provided at one side of the roll straightening steam tube 17, so that the operator adjusts the pressure of steam through the air adjusting screw so that the roll is deformed by heat. Can be prevented.

On the other hand, the heat transfer spring hole 16 forms a structure in which both ends are sealed after the thermoelectric spring 19 is inserted and the heat transfer solution 18 is filled, and the sealing structure has a separate stopper (not shown). It may be formed to be opened and closed if necessary using the.

In one embodiment of the present invention, the thermoelectric spring 19 is made of a metal having high thermal conductivity such as copper or aluminum, and a pair is vertically symmetrical in a state of being inserted into the heat transfer spring hole 16.

That is, the lower portion of the heat-transfer solution 18 is partially heated by the heat transferred from the lower induction portion 20, so that the temperature is increased, so that the portion expands and the density becomes smaller, so buoyancy is raised and rises up instead. The low temperature and high density come down. By repeating this process, the phenomenon of transferring heat by the movement of the material itself is convection. As a result, the heat-transfer solution 18 is warmed up from the upper part, that is, from the surface of the heat roll 10, thereby achieving efficient heat transfer.

On the other hand, since the expansion coefficient is changed according to the type of the heat transfer liquid 16, the amount of heat transfer liquid 18 to be filled in the heat transfer spring hole 16 is a certain amount of heat transfer liquid 18 to the heat transfer spring hole 16. If the filling amount is excessive, the heat transfer solution 18 is excessively heat-expanded, so that the heat transfer spring hole 16 may be damaged.

When the temperature of the heat transfer liquid 18 rises due to the convection phenomenon, part of the heat transfer liquid 18 is converted into gas, so that the temperature of the heat transfer spring hole 16 starts to rise faster by the steam effect.

In addition, the thermoelectric spring 19 inserted into the thermoelectric solution 18 serves to promote the convection phenomenon and the steam effect, and the thermoelectric spring 18 and the steam whose temperature has risen by being heated are heated in the process of rising upward. Since the acceleration moves along the wound curve of the spring 19 as the whirlwind is generated, the thermoelectric spring 19 plays a role of promoting convection and steam effects of the thermoelectric solution 18. The thermoelectric spring 19 uses a material having a higher thermal conductivity than the body of the thermal roll 10, and if necessary, the thermoelectric spring 19 may be manufactured in various shapes such as a spiral coil or a lattice, rather than a spring.

On the other hand, the thermoelectric liquid 18 is a liquid having high thermal conductivity, water or special oil may be used, and heating oil may be used.

As described above, since the heat transfer solution 18 having a high thermal conductivity is filled in the heat transfer spring hole 16, the heat of the induction part 20 transmitted from the center portion of the heat roll 10 is quickly transferred to the heat roll 10. It is transferred to the surface, resulting in higher thermal efficiency.

On the other hand, one side of the heater shaft 14 of the heat roll is provided with a temperature sensor 30 and a temperature sensor holder 31 for fixing the temperature sensor 30, the temperature cleaner 30 is a heat roll 10 The temperature sensor hole 32 formed on the inside of the heat roll 10 by detecting the correct temperature to display it to be recognized from the outside enables precise temperature control of the heat roll (10).

In addition, the power supplied to the three induction coils 23 of the induction unit 20 is controlled through the respective SCRs 24. By varying the connection method of the three-phase AC power supply, the temperature distribution of the heat rolls is varied in various patterns. It can be implemented.

The SCR (Silicon Controlled Rectifier) or thyrister is a kind of silicon controlled rectifier and forms a four-layer structure of PNPN, and is composed of three electrodes: an anode, a cathode, and a gate. It is a power control device that is used to control large power with small gate current. It is widely used for lighting control and electric power control of tanks.

That is, the induction unit 20 according to the present invention is powered by a star-connection method when using a three-phase four-wire AC power source as shown in FIG. 4A as an example.

The star connection is also referred to as a Y connection, one side of each induction coil 23 is supplied with power from an external power source through the SCR 24, the other end of each induction coil 23 is connected to a neutral point (neutral point) As a method, even if the user adjusts one SCR 24, since the other two SCRs are not affected at all, the amount of heat generated in each induction coil 23 can be freely adjusted.

On the other hand, as another embodiment of the present invention, when using a three-phase three-wire AC power source as shown in Figure 4b is powered by a ring-connection (ring-connection) method.

The annular connection, also called Δ connection, is a connection method in which both ends of each induction coil 23 are connected to one end of a different induction coil, and the power supplied to each induction coil 23 is each SCR 24. Since it is controlled by the user, even if the user adjusts one SCR 24 as in the star connection, it does not affect the other two SCR at all, and thus the user is generated in each induction coil 23 according to the working state It is possible to freely control the amount of heat generated.

That is, the induction part 20 has one side of each induction coil 23 directly connected to an external power source, and the other side of each induction coil 23 has an intermediate SCR 24 for adjusting power supplied from an external power source. It is composed of an annular connection system connected to one side of the other induction coil 23 in the inserted state.

Therefore, when the user arbitrarily adjusts the SCR 24, each part of the surface of the heat roll 10 may be adjusted to the same temperature when viewed in the longitudinal direction of the heat roll 10, and may be adjusted to a constant high temperature for each specific portion. Etc., the local difference with respect to the surface temperature of the heat roll 10 can be freely adjusted, so that it is possible to simultaneously perform post-treatment work such as wrinkle work or color change work of the fabric at the same time as the calendar work.

Although the embodiments of the present invention have been described in detail as described above, the scope of the present invention is not limited thereto, and the scope of the present invention extends to the range substantially equivalent to one embodiment of the present invention.

Induction heat roll using a three-phase AC power in the present invention uses a plurality of induction unit 20 by the induction heating method as a heat source, supplied to the induction coil 21 of the induction unit 20 through the SCR (24) By controlling the amount of power, it is possible to adjust the temperature change precisely on the surface of the heat roll 10, and the convection phenomenon of the heat-transfer liquid 18 and the heat-transfer liquid 18 having high thermal conductivity on the circumferential surface between the center and the surface of the heat roll body 10. By providing a plurality of heat transfer spring holes (16) with a built-in thermoelectric spring (19) to promote the heat transfer efficiency of the heat roll itself, the three-phase AC power is supplied by the star connection or annular connection method and SCR Since the temperature of each surface portion of the heat roll 10 can be arbitrarily controlled by controlling the amount of power supplied to each induction part 20 by using the 24, a desired portion even when the fiber is shorter in width than the heat roll 10 itself. Won There are effects that can be processed freely in accordance with the temperature.

In addition, it is possible to easily prevent the heat roll 10 from being deformed by heat by adjusting the pressure of steam through an air adjusting screw (not shown) provided at one side of the roll straightening steam tube 17.

Claims (3)

In the heat roll consisting of a cylindrical body, It is enclosed in a state in which the thermoelectric fluid and the thermoelectric spring are mounted, and are in close contact with a plurality of heat transfer spring holes penetrated in the longitudinal direction on the circumferential surface between the surface of the heat roll and the induction part, and the outer diameter of the heater pipe provided at the center of the heat roll. A plurality of induction parts for generating heat by an electromagnetic induction action, a plurality of SCRs for controlling the temperature distribution on the surface of the heat roll by adjusting the power supplied to the induction part, and when the heat roll is rotated in combination with the heater pipe A plurality of penetrating longitudinally on the circumferential surface between a heater shaft serving as a central axis, a temperature sensor provided at one side of the heater shaft and detecting a temperature of a heat roll, and another heat transfer spring hole adjacent to the heat transfer spring hole; It consists of a roll calibration steam tube which is inserted in two spaces and filled with distilled water inside. Induction heating roll using three-phase AC power. The method of claim 1, The induction unit is connected to the SCR one side of each induction coil to control the power supplied from the external power source, the other side of each induction coil is characterized in that the star connection method is connected to the neutral point (neutral point) Induction heating roll using phase AC power. The method of claim 1, The induction part has one end of each induction coil directly connected to an external power source, and the other side of each induction coil has an annular shape connected to one side of another induction coil in a state in which an SCR for controlling power supplied from an external power source is inserted in the middle. Induction heating roll using a three-phase AC power source, characterized in that the connection method.