KR100500190B1 - Cooling roll using heatpipe mode - Google Patents

Abstract

The present invention relates to a processing apparatus using a cooling pipe of the heat pipe type, in particular, to install a wick in the form of a mesh on the inner surface of the cooling roll outer cylinder or to form a number of grooves on the inner surface of the cooling roll outer cylinder to form the inside of the vacuum state The present invention relates to a device for processing a high temperature fabric by a heat pipe principle by inserting a working fluid, and by applying a heat pipe type cooling roll, the inside of a rotating cooling roll is formed in a normal heat pipe state so that heat exchange is performed very quickly. It achieves heat exchange and high heat exchange effect, and it improves the processing quality of the fabric because there is little surface temperature variation and no condensation occurs, and a mesh wick is installed on the inner surface of the cooling roll outer cylinder or numerous grooves are provided on the inner surface of the cooling roll outer cylinder. By inducing diffusion of the inner surface by surface tension of working fluid, it improves heat exchange efficiency even at low rotation speed. And, to the outer diameter of the cooling water pipe by increasing the thermal efficiency of the cooling water pipe to the outer diameter of the mounting pin or the cooling water pipe to the plate-like shape as a waveform, there is an effect to reduce the number of the cooling water pipe to lower the production cost.

Description

COOLING ROLL USING HEATPIPE MODE}

The present invention relates to a processing apparatus using a cooling pipe of the heat pipe type, in particular, to install a wick in the form of a mesh on the inner surface of the cooling roll outer cylinder or to form a number of grooves on the inner surface of the cooling roll outer cylinder to form the inside of the vacuum state The present invention relates to an apparatus for inserting a working fluid to process a high temperature fabric by the heat pipe principle.

In general, a heat pipe is a device in which a working fluid in a sealed container transfers heat between two ends of a vessel through a phase-change process between gas and liquid, and moves heat using latent heat to operate a single phase. It exhibits very large heat transfer performance compared to conventional heat transfer devices using fluids. Heat pipes consist of a sealed container, working fluid and capillary inside the container, and are classified into various types according to the material and working fluid of the outer wall, the type of capillary structure, the liquid return method, the internal geometry, and the operating temperature. On the other hand, the capillary structure is a wick (wick) or groove is used, the wick is a porous structure that can act as a wick, is made of the same material as possible attached to the inner wall, the groove is made by processing the inner wall of the container in a suitable form.

Such a case in which the liquid is returned by the wick is called a "heat pipe", and may be formed by various methods such as gravity and centrifugal force, and collectively called a "heat pipe."

In addition, the heat pipe is divided into evaporation unit, condensation unit, and heat insulation subdivision, and the vapor evaporated from the evaporation unit is transferred to the condensation unit, and the condensate condensed in the condensation unit is returned to the evaporation unit through the wick. At this time, the heat evaporated from the evaporator is transferred to the condenser in the form of latent heat by the working fluid inside the evaporator to condense.

These heat pipes are capable of transporting a large amount of heat without external power, and are excellent in heat transfer efficiency, and are thermal superconductors. Thus, heat pipes are instantaneously transferred to the entire pipe regardless of their length, and the temperature distribution is almost the same. This very good, fast heat transfer, good heat response has a good haptic satisfaction.

Many cylinder rolls are used in the fabrication and processing of various fabrics in the soft packaging, textiles, and sheet metal coil industries. Among them, heat is applied to the cylinder rolls through cooling water for cooling or surface processing of fabrics such as laminating, seasoning, and coating. A general cooling roll method is used to take over and take away. In such a conventional cooling roll, a technique of heat-exchanging while forming a helical water channel as the cooling water passes through the inside of the cooling roll to keep the cooling water in the cooling roll for a long time is also used.

However, this conventional cooling roll has a large temperature variation of the cooling roll because the temperature rises due to the high temperature fabric as the cooling water passes, and since the surrounding air is always exchanging heat with the cooling water through the outer cylinder, Condensation may occur and damage the fabric or make fabric processing difficult.

In addition, when the heat pipe type cooling roll is operated at a low speed rotation, it is difficult to attach the working fluid to the inner surface of the outer cylinder because of the small centrifugal force, and it is difficult to return the working fluid condensed on the cooling water pipe, thereby reducing the heat exchange efficiency.

The present invention has been invented to solve such a problem, and forms the inside of the cooling roll in a vacuum state and fills the working fluid into a normal heat pipe state, and returns the working fluid condensed in the cooling water pipe by centrifugal force. By providing heat pipe type cooling roll to make heat exchange between the cooling roll outer cylinder and the cooling water pipe, the heat exchange efficiency is dramatically increased and the surface temperature is uniform so that the processing quality of the fabric can be improved and the roll surface is affected by the ambient temperature. The present invention provides a processing apparatus using a heat pipe type cooling roll which prevents condensation from occurring.

In addition, due to insufficient centrifugal force during low speed rotation, it is difficult to apply the working fluid to the inner surface of the cooling roll, and the heat exchange efficiency may be reduced due to the inability to return the working fluid condensed in the cooling water pipe. Mesh type wick is installed on the inside or numerous grooves are formed on the inner surface of the cooling roll outer cylinder to induce diffusion due to the surface tension of the working fluid even with a small centrifugal force to increase the heat exchange efficiency even at low speed rotation, and to heat exchange the outer diameter of the coolant pipe. By installing a fin or by corrugating the outer diameter of the coolant pipe, the present invention provides a device that can increase the heat exchange area and ultimately reduce the number of coolant pipes, thereby reducing the manufacturing cost.

Hereinafter, the heat pipe cooling roll according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a schematic view of the inside of a heat pipe cooling roll according to the present invention, and FIG. 2A is a cross-sectional view of the heat pipe cooling roll at the time of stopping the cooling roll of the present invention. It is filled at the bottom of the

Figure 2b is a cross-sectional view of the heat pipe cooling roll during the rotation of the cooling roll of the present invention, the heat pipe cooling roll 100 is a shaft which is the shaft and the outer cylinder 10 to which the fabric touches in order to cool the high temperature fabric 90 Comprising a cylindrical shape that rotates to 60, the cooling water cooled by the external freezer flows into the shaft of one side and passes through a plurality of cooling water pipes 20 formed in the cooling roll 100 while the other side is heat exchanged Coolant is flowing out to the axis of.

In the present invention, the heat pipe cooling roll (100) is heat exchanged between the outer cylinder (10) to which the high temperature fabric (90) contacts and the coolant pipe (20) therein. This space is formed in a conventional heat pipe method. Heat exchange occurs, so heat exchange occurs very quickly and heat exchange efficiency is high,

The heat exchange principle of the present invention is a vacuum between the space between the outer cylinder 10 of the cooling roll 100 and the plurality of cooling water pipes 20 formed therein, that is, the space 88 inside the cooling roll in a vacuum state. By filling the fluid 80, the inner space of the outer cylinder 10 is in a bottom pipe state to allow heat exchange between the outer cylinder 10 and the coolant pipe 20.

Figure 2b is a cross-sectional view of the heat pipe type cooling roll during the cooling roll rotation of the present invention, Figure 4a is a heat exchange fin installed in the outer diameter of the cooling water pipe of the present invention, the high temperature fabric 90 is a cooling roll When the high temperature heat is transmitted to the outer cylinder 10, heat is conducted from the outer surface of the outer cylinder 10 so that the working fluid attached to the inner surface of the outer cylinder 10 evaporates to form a gas, and the pressure increases. The working fluid is condensed by the temperature difference when the gas moves to the pressure difference and contacts the plurality of cooling water pipes 20 having the structure of the heat exchange fins 40. The condensed working fluid is scattered by the centrifugal force generated due to the rotation of the cooling roll 100 and is again sprayed into the outer cylinder of the cooling roll 100 (the return of the working fluid), thereby lowering the temperature of the outer cylinder 10. Play a role. This heat exchange principle is a heat pipe heat exchange principle, the heat exchange rate is very fast and high heat exchange efficiency can be obtained.

As another preferred embodiment of the heat exchange fin 40 mounted on the coolant pipe, as shown in FIG. 4B, the outer diameter of the coolant pipe 20 is corrugated to increase the heat exchange efficiency of the coolant pipe 20. To do

Figure 2b is a cross-sectional view of the heat pipe type cooling roll during the cooling roll rotation of the present invention, Figure 3 is a schematic view showing the inside of the heat pipe type cooling roll of the present invention as another embodiment of the present invention, the site fabric processing According to the application, if the rotational speed of the cooling roll is low and the centrifugal force is small, since the condensate is not scattered, the return of the working fluid does not occur quickly, and the burnout out of the working fluid evaporates from the inner surface of the outer cylinder. As the phenomenon occurs, heat exchange may not be performed smoothly.

In order to solve this problem, in the present invention, as shown in FIG. 2B, a wick 30 having a mesh shape is attached to the inner surface of the cooling roll outer cylinder 10, or as shown in FIG. 3, a number of grooves are provided on the inner surface of the cooling roll outer cylinder 10. (35) is formed so that the working fluid 80 can ride up the inner surface by the surface tension to facilitate the application of the working fluid even by a small centrifugal force to achieve a smooth heat exchange even at a relatively low rotational speed. The condensate at this time is to be fed back to the bottom by gravity rather than centrifugal force.

In order to achieve the heat pipe type cooling roll structure, a cylindrical cooling roll 100 as shown in FIG. 1 and a plurality of cooling water pipes 20 through which cooling water passes are formed therein, and the cooling roll outer cylinder 10 is connected to the outside. After the airtight seal was sealed, the inner space was a vacuum space 88, and an appropriate amount of the working fluid 80 was inserted therein, so that the inside of the cooling roll 100 became a heat pipe having a very high thermal conductivity. And fast heat exchange between the cooling water pipe 20. Here, the coolant pipe 20 should be maintained in strength and airtight to withstand the vacuum, and the outer cylinder 10 should also be made without airtightness to maintain the vacuum.

When the high temperature fabric 90 touches the outer cylinder 10 surface of the cooling roll 100 that is rotating, heat is conducted from the outer surface of the outer cylinder 10 to the inner surface, and the working fluid 80 attached to the inner surface of the cooling roll 100 It takes away heat as it evaporates. The evaporated gas moves to the coolant pipe 20 through which the pressure rises and the coolant passes, transfers heat, condenses in the form of droplets, and the droplets are discharged by the centrifugal force generated while the cooling roll 100 rotates. The heat is rapidly dissipated toward the inner surface of the shell while repeating this operation.

The amount of droplet-shaped condensate scattered by the centrifugal force may vary depending on the difference between the centrifugal force and the adhesion force of the condensate attached to the cooling water pipe 20. Therefore, in order for the scattering to be smoothly performed at the same centrifugal force, a coating treatment such as Teflon, stearic acid or oleic acid coating for lowering the condensate adhesion force on the surface of the cooling water pipe 20 may be performed. However, care should be taken because Teflon coatings degrade thermal conductivity, and stearic or oleic acid coatings may melt over time and weaken and contaminate the working fluid.

At this time, between the inner surface of the cooling roll outer cylinder 10 and the cooling water pipe 20 is isolated in a vacuum state, because the heat exchange is carried out by the heat pipe principle in this space, the portion does not reach the fabric, as shown in Figure 2a As described above, heat exchange is not performed when the cooling roll 100 is stopped.

Therefore, there is an advantage that no condensation occurs. In addition, since the heat exchange in the interior is made at the same time throughout the longitudinal direction of the cooling roll 100, the surface temperature variation of the cooling roll 100 is also very small, thereby improving the processing quality of the fabric.

The type and concentration of the working fluid 80 and the degree of vacuum may vary depending on the material constituting the cooling roll 100 and the use temperature.

However, when the heat pipe type cooling roll 100 is operated at a low speed rotation, the centrifugal force is small and it is difficult to attach the working fluid 80 to the inner surface of the outer cylinder 10, and condensation on the coolant pipe 20 by the centrifugal force. The return of the working fluid is also difficult, so there is a disadvantage in that the heat exchange efficiency is lowered.

      In the present invention, in order to solve this disadvantage, as shown in Figure 2a and 2b, by installing the wick 30 of the mesh form on the inner surface of the outer cylinder 10, the working fluid is the entire inner surface by the surface tension even with a small centrifugal force It can be applied to the to prevent the burnout of the working fluid to prevent the heat exchange efficiency is lowered.

The mesh size of the wick in the form of a mesh can vary depending on the type of working fluid and the operating temperature.However, the mesh generally uses a capillary force of the working fluid using a wire mesh or metal fiber of 50 to 200 mesh or the inner surface of the outer cylinder. It is machined with grooves so that the working fluid can climb on the wall during rotation. The range of low speed rotation may vary depending on the diameter of the cooling roll and the number of rotations used.

In addition, as another preferred embodiment, as shown in Figure 3, on the inner surface of the outer cylinder 10 by forming a number of grooves (35) by sand blast (sand blast), such as the same effect as the wick 30 of the mesh form It is to include.

FIG. 4A shows that the heat exchange fins 40 are formed on the outer diameter of the coolant pipe 20 to increase the heat exchange area, thereby reducing the number of coolant pipes compared to the case of using a finless pipe. The heat exchange area varies according to the fin size and adhesion density, the fin size and density are calculated according to the required heat exchange capacity, and the number of coolant pipes can be determined.

In addition, as another preferred embodiment of FIG. 4A, the outer diameter of the coolant pipe 20 is corrugated to increase the heat exchange efficiency of the coolant pipe 20.

As described above, heat exchange is performed inside the rotating cooling roll in the heat pipe state by the application of the heat pipe type cooling roll of the present invention to obtain very fast heat exchange and high heat exchange effect, and the surface temperature variation is small and condensation occurs. The processing quality of the fabric can be improved, and the mesh-shaped wick is installed on the inner surface of the cooling roll outer cylinder or numerous grooves are formed on the inner surface of the outer cylinder to induce internal diffusion by the surface tension of the working fluid. Increasing efficiency and reducing the number of cooling water pipes by making the cooling water pipes in the form of fins reduces the manufacturing cost.

1 is a schematic diagram of a heat pipe cooling roll of the present invention;

2A is a cross-sectional view of the heat pipe type cooling roll at the time of stopping the cooling roll of the present invention;

Figure 2b is a cross-sectional view of the heat pipe cooling roll during the cooling roll rotation of the present invention,

Figure 3 is a schematic diagram of the inside of the heat pipe cooling roll of the present invention as another embodiment of the present invention,

Figure 4a is a heat exchange fin installed in the outer diameter of the coolant pipe of the present invention,

4B is a wave shaped coolant pipe of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: outer cylinder 20: coolant pipe,

30: Wick 35: Home

40: heat exchange fin 60: shaft

80: working fluid 88: vacuum space

90: fabric 100: cooling roll

Claims (5)

Cylindrical cooling roll 100 having a rotating shaft 60 and a plurality of cooling water pipes 20 through which cooling water passes, and the cooling roll outer cylinder 10 is sealed to prevent airtightness from the outside. Next, the inner space is used as the vacuum space 88 and the working fluid 80 is filled in the vacuum space 88, and the high temperature fabric 90 is brought into contact with the outer circumferential surface of the outer cylinder 10 of the cooling roll 100. In addition, the inner surface of the cooling roll outer cylinder 10 further includes a wick 30 in the form of a mesh for diffusion of the working fluid, or a plurality of grooves 35 are formed on the inner surface of the cooling roll outer cylinder 10. Heat pipe type cooling roll. delete delete The heat pipe cooling roll according to claim 1, wherein a heat exchange fin (40) is formed on an outer circumferential surface of the cooling water pipe (20). 2. The heat pipe cooling roll according to claim 1, wherein an outer diameter of the cooling water pipe (20) is formed in a wave shape.