JPS593035B2 - heating roller device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure of a heating roller that obtains an effect of increasing the surface temperature by using thermal energy based on induction heating.

Generally, in the spinning process of synthetic fibers, it is necessary to heat the fibers at an appropriate temperature of about 240° C. in order to obtain the original characteristics of the fibers.

Therefore, 1θ heating rollers are widely used, and this conventional configuration will be explained with reference to the cross-sectional view shown in FIG. In FIG. 1, a roller 1 is made of a magnetic material, and a shaft 2 is attached to the center thereof. Reference numeral 3 denotes a copper lining, which is fitted onto the inner circumferential surface of the roller 1.

4 is a 15 end plate, through which the shaft 2 is passed through the center,
Fixed in place.

A coil frame 5 is made of a magnetic material and is fixed to the inner surface of the end plate 4 surrounded by the rollers 1.

A coil 1 is housed in the coil frame 5.

In the configuration shown in FIG. 1, the shaft 2 is driven at an appropriate speed by an electric motor (not shown), and AC power is supplied to the coil 6 at the same time.

As a result, alternating magnetic flux is generated in the magnetic circuit including the coil frame 5 and the roller 1. Due to this change in magnetic flux, an induced current flows through the copper lining 3, which constitutes, so to speak, the secondary winding of the transformer, and the copper lining 3 is heated. The heat generated in the copper lining 3 is transferred to the roller 1, raising the surface of the roller 1 to a predetermined temperature. Then, the synthetic fibers are brought into contact with the outer circumference (O surface) of the roller 1, and the synthetic fibers are heated.By the way, the opposing surface between the copper lining 3 and the inner circumferential surface of the roller 1 maintains the degree of adhesion over the entire circumference. It is difficult to increase the height, and as a result, a slight gap G exists between the two.

Since the thermal conductivity of this gap G is extremely low, it is necessary to supply extra power to the coil when increasing the outer circumferential surface of the roller 1 to a certain value, which is problematic from an energy saving perspective. Moreover, the temperature of the coil 6 will also increase, and it is conceivable that the coil 6 will burn out. Therefore,
Copper plating is applied to the inner surface of the 40-roller 1 to an appropriate thickness by ensuring complete adhesion between the opposing surfaces of the roller 1 and the copper lining 3.

@The copper lining is pressed against the inner surface of the roller 1 by electrical or mechanical means. Molten metal is sprayed onto the inner peripheral surface of the O-roller 1 to obtain a suitable thickness. Although there are various means such as
All of them had the disadvantage that the work process was troublesome and the production costs were high. The purpose of the present invention is to effectively utilize electric power in a simple working process of the heating roller by interposing thermally conductive grease between the non-magnetic conductive lining material of a pot etc. and the inner peripheral surface of the roller. Another object of the present invention is to provide a heating roller device that reliably prevents burnout of a heating coil.

The illustrated embodiment will be specifically described below.

FIG. 2 is a cross-sectional view of the heating roller device according to the present invention. In FIG. 2, equivalent components in the configuration shown in FIG.
are grooves formed in a circular ring shape along the inner circumferential surface of the roller 1 in parallel. Thermal conductive grease x is present in the gap G between the inner circumferential surface of the roller 1 and the outer circumferential surface of the copper lining 3 and in each groove 1a. By the way, this grease X is inserted into the gap G and the groove 1a by applying it around the copper lining 3 when the copper lining 3 is inserted into the roller 1. That is, in the process of inserting the copper lining 3 into the roller 1, the grease x comes into close contact with the inner peripheral surface of the roller 1 and the outer peripheral surface of the copper lining 3, filling the gap G, and the excess grease The copper lining is collected in the insertion opening. At this time, if there is insufficient grease to fill the grooves 1a, the grooves 1a are filled with grease X in advance before the copper lining 3 is inserted into the roller 1. In the configuration shown in FIG. 2, alternating power is supplied to the coil so that the temperature of the outer circumferential surface of the roller 1 in contact with the object to be heated (thread or cloth-like material such as synthetic fibers) is approximately 220.degree.

The heating principle of this roller 1 is exactly the same as the principle (described above) in the configuration shown in FIG. 1 above. However, the thermal energy given to the copper lining 3 by electromagnetic induction is efficiently transmitted to the roller 1 because the gap G in FIG. 1 is filled with thermally conductive grease x. A comparison of this thermal energy transfer based on actual measurements is as follows. FIG. 3 shows actual measurement data regarding differences in temperature at various parts between the heating roller device according to the present invention and a conventional device not shown in FIG.

In Figure 3, the measurement channels Pl, P, ,P on the horizontal axis
, , P4 and P indicate the coil frame 5, the center of the coil 6, the surface of the coil 6, the inner surface of the copper lining 3, and the outer peripheral surface of the roller 1, respectively.

The vertical axis indicates the temperature of each part. Graph 4 shows the characteristics of the conventional configuration shown in FIG. 1, and graph @ shows the characteristics of the configuration according to the present invention shown in FIG. 2.
As is clear from the temperature characteristics shown in graph 4, @ in FIG. 3, in order to maintain the temperature of the outer peripheral surface of the roller 1 at a predetermined value, there is a considerable difference in the temperature of each part.
That is, the temperature difference between the outer peripheral surface of the roller 1 and the copper lining 3, which was conventionally 90°C, is 50°C with the configuration of the present invention.
The central temperature of the heating coil 6 decreases from 362°C to 320°C. This fact has a great effect on the insulation deterioration of the coil 6. On the other hand, when comparing the input power, the conventional configuration (the configuration shown in Figure 1) had 12,000 power, while the configuration according to the present invention shown in Figure 2 had an input power of 1,119 (power), which is an approximately 7% reduction in input power. Energy savings corresponding to this amount will be achieved. Note that due to the difference in thermal expansion coefficient between the copper lining 3 and the roller 1, the thermally conductive grease interposed between them is subjected to stress.
This is compensated by the inflow and outflow of grease into a.

However, this groove 1a does not necessarily have to exist, and even if there is some inconvenience (for example, some grease flows out from the insertion end of the copper lining 3), it can be implemented without much problem in practice. On the other hand, thermally conductive grease X, which forms the gist of the present invention, is required to have a thermal resistance as low as that of metal and to withstand continuous use under conditions of 2250 to 300°C. Next, as a means to further reduce the thermal resistance of thermally conductive grease, it is possible to mix metal powder into the thermally conductive grease.

Since the mixed metal powder usually has a lower thermal resistance than thermally conductive grease, the thermal resistance of the entire grease can be further reduced, and the effects of the present invention can be further enhanced. As described above, in the heating roller device according to the present invention, thermally conductive grease is filled between the inner peripheral surface of the roller, which is made of a magnetic material, and the heated non-magnetic conductive lining, which rotates while the outer periphery is in contact with the object to be heated. This is how it was done.

Based on this configuration, the heat conduction effect between the lining and the inner peripheral surface of the roller is significantly improved compared to the conventional gap state, and the power required to obtain a constant temperature on the outer peripheral surface of the roller is reduced ( Energy saving) can be realized. Furthermore, the filling of the thermally conductive grease between the inner circumferential surface of the roller and the non-magnetic conductive lining is carried out by means of thermal short-circuiting, such as plating, thermal spraying, and various other electrical and mechanical means. The work process is significantly simplified compared to the conventional method, and there is no adverse effect of increasing product costs.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional heating roller device, FIG. 2 is a sectional view of a heating roller device according to the present invention, and FIG. 3 is a graph showing the temperature characteristics of the heating roller. 1...Roller, 3...Copper lining,
1a---Groove, 4---Thermal conductive grease.

Claims (1)

[Scope of Claims] 1. Electromagnetic induction from a coil is applied to the outer circumferential surface of a roller that is rotatably provided in contact with the outer circumference of the object to be heated, and is applied to a non-magnetic conductive lining fitted into the inner circumferential surface of the roller. In a configuration in which the thermal energy generated by the above is transmitted by conduction, thermally conductive grease or thermally conductive grease mixed with metal powder is filled between the inner circumferential surface of the roller and the outer circumferential surface of the non-magnetic conductive lining. A heating roller device characterized by: 2 Heat energy generated by electromagnetic induction from a coil is transferred to the outer circumferential surface of a rotatably provided roller that is in contact with the outer circumference of the object to be heated, and to the non-magnetic conductive lining fitted into the inner circumferential surface of the roller. In the configuration in which the transmission is conducted by conduction, a plurality of annular grooves are formed along the inner circumferential surface of the roller, and heat is transferred between the plurality of grooves, the inner circumferential surface of the roller, and the outer circumferential surface of the nonmagnetic conductive lining. A heating roller device characterized by being filled with conductive grease or thermally conductive grease mixed with metal powder.