JPH059834Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heater with a cooling pipe provided in an extrusion cylinder or the like in a synthetic resin extrusion molding machine.

[Prior Art] In a synthetic resin extrusion molding machine, at the beginning of operation, the temperature of the heated object, ie, the extrusion cylinder, is heated to the heating melting temperature of the synthetic resin.

For this reason, a heater with a cooling tube is usually provided on the outer peripheral surface of the object to be heated, and the object is heated by electric heat.

In such a synthetic resin extrusion molding machine, as the work progresses, frictional heat of the material due to the rotation of the screw of the extrusion molding machine is added, causing the temperature of the extrusion molding machine to rise too much.

Therefore, in order to control the temperature of the heated object to be constant, it is necessary to cool the heated object from the outer peripheral surface, and the temperature is controlled to be constant by the cooling pipe of the heater with cooling pipe.

Conventionally, as shown in FIGS. 4 and 5, a heater with a cooling tube is used to heat a heated object 1 such as an extrusion cylinder.
It has a set of heat exchanger plates 2 provided using bands 8 on the sides. A heater 3 such as a sheathed heater and a cooling pipe 5 are buried within the thickness of the heat transfer plate 2.

Usually, the heater 3 and the cooling pipe 5 are embedded by casting into the thickness of the heat transfer plate 2, which is made of a metal material with excellent thermal conductivity such as aluminum material.

Both ends of the heater 3 and the cooling pipe 5 extend outside the heat exchanger plate 2.

The heat exchanger plates 2 are made into a semi-cylindrical shape, and a pair of heat exchanger plates 2 are provided on the outer circumferential surface of the object to be heated 1 .

In this way, the object to be heated is heated by the heater 3, and during cooling, water is passed through the cooling pipe 5 to perform cooling.

[Problems to be solved by the invention] However, since the heater 3 and the cooling pipe 5 are buried within the thickness of the heat transfer plate 1, when the cooling pipe 5 corrodes or is destroyed by thermal stress, , there is a problem that the heat exchanger plate 2 and heater 3 must be replaced at the same time.

Therefore, an object of the present invention is to provide a heater with a cooling tube that allows only the cooling tube to be removed from the heat exchanger plate and replaced with a new cooling tube when the cooling tube breaks.

Another object of the present invention is to provide a heater with a cooling tube whose weight is reduced by reducing the thickness of the heat exchanger plate.

[Means for Solving the Problems] According to the present invention, in the heater with a cooling tube, which has a first heat exchanger plate in which a heater is embedded, and a second heat exchanger plate in which a cooling tube is embedded, The first and second heat exchanger plates are stacked so as to be separable from each other at the concave and convex portions of the first heat exchanger plate, a cooling pipe is embedded in the convex portion of the first heat exchanger plate, and the convex portion of the second heat exchanger plate is embedded in the convex portion of the first heat exchanger plate. According to the present invention, there is obtained a heater with a cooling pipe characterized in that the cooling pipe is embedded.

[Function] In the heater with a cooling tube of the present invention, since the first heat transfer plate in which the heater is embedded and the second heat transfer plate in which the cooling tube is embedded are provided, when the cooling tube is broken, the second heat transfer plate is installed. The second heat exchanger plate is removed and replaced with a new second heat exchanger plate.

Furthermore, since the first and second heat transfer plates are overlapped at the uneven portions, the heater with cooling tubes is thinner, the material and weight are reduced, and heat is quickly conducted to the heated object.

[Embodiment] FIGS. 1 and 2 show an embodiment of the heater with a cooling tube of the present invention.

The illustrated heater with a cooling tube has a first heat exchanger plate 11 and a second heat exchanger plate 12 formed by casting using a metal material with excellent thermal conductivity such as aluminum material.
It has A heater 13, such as a sheathed heater, is embedded within the thickness of the first heat exchanger plate 11, which is cast when the first heat exchanger plate 11 is cast.

Cooling pipes 15 cast during casting of the second heat exchanger plate 12 are embedded within the thickness of the second heat exchanger plate 12 .

The first heat exchanger plate 1 and the second heat exchanger plate 12 are integrally assembled by overlapping each other.

The first heat exchanger plate 11 and the second heat exchanger plate 12 have a concave portion 16 and a convex portion 17 to be overlapped with each other.
is formed.

The convex portion 17 of the first heat exchanger plate 11 has a heater 13
is buried. Convex portion 17 of second heat exchanger plate 12
A cooling pipe 15 is buried therein.

In the heater with a cooling tube made in this way, the heater 13 is placed within the thickness of the first heat transfer plate 11.
are arranged in a meandering pattern.

Cooling pipes 15 are embedded in the thickness of the second heat exchanger plate 12 in a meandering manner.

By the way, in this heater with cooling tubes, as shown in FIG. 1, a pair of heaters with cooling tubes are provided with a heated object (not shown) in between.

That is, the heater with a cooling tube is formed into a semi-cylindrical shape, the inner surface of which is brought into contact with the semi-outer circumferential surface of the cylindrical heated object, and the heater with a cooling tube is combined with another heater with a cooling tube (indicated by a two-dot chain line). It is provided in the heated body in a cylindrical shape.

At this time, a band 19 is wound around the outer peripheral surface of the second heat exchanger plate 12. Since both ends of the band 19 are fixed by the fixtures 20, a pair of heaters with cooling tubes are provided on the object to be heated.

In this way, the object to be heated is heated by the heater 13 of the first heat exchanger plate 11. Further, when the temperature of the heated object rises above a certain temperature, water is passed through the cooling pipe 15 of the second heat exchanger plate 12 to cool it.

Therefore, when this heater with a cooling tube is used, temperature control of heating and cooling is repeated by the heater 13 and the cooling tube 15, and a constant temperature is maintained for the heated object.

The heater with a cooling tube shown in FIG. 3 shows another embodiment.

In the illustrated heater with cooling tubes, the first heat exchanger plate 11 and the second heat exchanger plate 12 of the heater with cooling tubes shown in FIG. 3 are stacked in reverse.

At this time, the first and second heat exchanger plates 11, 12
The concave portion 16 and the convex portion 17 are formed so as to overlap each other.

[Effects of the invention] As described above with reference to the embodiments, according to the heater with a cooling tube of the present invention, the first and second heat exchanger plates are separably combined, so that the heater or the cooling tube It is easy to replace, and the heat exchanger plate can be formed thin, reducing weight and materials.

Furthermore, since the heater and the cooling pipe are provided near the object to be heated, thermal conductivity is improved.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the heater with cooling tube of the present invention, Fig. 2 is a sectional view of the heater with cooling pipe of Fig. 1, and Fig. 3 shows another embodiment of the heater with cooling pipe. 4 is a perspective view of a conventional heater with cooling tubes, and FIG. 5 is a sectional view of the heater with cooling tubes shown in FIG. 4. 11...First heat exchanger plate, 12...Second heat exchanger plate, 13...Heater, 15...Cooling pipe, 16...
Concave portion, 17...Convex portion, 19...Band.

Claims (1)

[Scope of utility model registration request] In the heater with a cooling tube, which has a first heat exchanger plate in which a heater is embedded, and a second heat exchanger plate in which a cooling tube is embedded, the first and second heat exchanger plates are arranged at mutual uneven portions, A heater with a cooling tube, which is separably stacked on top of each other, and wherein a heater is embedded in the convex part of the first heat exchanger plate, and a cooling pipe is embedded in the convex part of the second heat exchanger plate. .