JPS5931396Y2 - Heater with water cooling - Google Patents

Description

[Detailed explanation of the invention] In order to prevent the extrusion cylinder from overheating, the heater attached to the extrusion cylinder of the synthetic resin extrusion molding machine has a
Those with a structure that can be cooled by air cooling or water cooling are used.

As shown in FIGS. 1 and 2, a conventional water-cooled heater has water-cooled vibrators 2, 2 on each heat exchanger plate 1, which is formed into a semicircular shape, for example, sandwiching the outer peripheral surface of an extrusion cylinder from both sides. Casting heating wires 3, 3 such as sheathed wires,
Most of them have a structure in which both ends of the water cooling pipes 2, 2 are drawn out to the outside of each heat exchanger plate 1, 1, and a socket 4.4 is fixed to each drawn end, but this heater with water cooling However, there is a drawback that cracks are easily formed in the drawn-out portions 5.5 of the water-cooled pipes 2, 2 which are drawn out to the outside of the respective heat exchanger plates 1, 1, and water easily leaks from the cracks.

The present invention aims to provide a water-cooled heater that can eliminate the above-mentioned conventional drawbacks.

The embodiment of the present invention will be explained below based on Figures 3 and 4 of the drawings. Reference numerals 6 and 6 are a pair of heat transfer plates made of a material that easily conducts heat such as aluminum, brass, filler metal, or iron. The heat transfer plates 6, 6 are butted against each other to form a cylinder, and the inner wall of the cylinder is The entire unit is attached to a synthetic resin extrusion molding machine so that it comes into contact with a heated surface such as the outer peripheral surface of an extrusion cylinder.

Reference numerals 8 and 8 designate water-cooled pipes that are cast into each heat exchanger plate 6 in a meandering manner, and both ends 9 and 10 of these pipes are recessed within the thickness of each heat exchanger plate 6.6.

11.12 is a socket fixed to both ends 9, 10 of each water cooling pipe 8, 8, a part of which is cast into the heat exchanger plate 6, 6.
The remaining portions protrude to the outside of the heat exchanger plates 6, 6.

13. Reference numeral 13 denotes a heating wire such as a sheathed wire cast into the heat exchanger plates 6, 6 in a meandering manner, and a power supply connection end 14 provided on the end face of one of the flanges 7 of the heat exchanger plates 6, 6. .14 is connected.

Reference numerals 15 and 16 denote through holes drilled in the flange portions 7, 7 of the heat exchanger plates 6, 6, and by inserting threaded bolts into the holes and screwing them into the holes, the heat exchanger plates 6, 6 can be opened. combine into one.

Next, to explain how to use the water-cooled heater constructed as described above, the outer peripheral surface of the suppression cylinder is connected to the heat transfer plate 6.
, 6, butt the heat exchanger plates 6, 6 together in a cylindrical shape, tighten the flanges 7, 7 with threaded bolts and nuts, and tighten the socket Nl.
, 12 by connecting the water supply pipe to one side and the drain pipe to the other side to complete the installation of the heater.

Then, the heating wires 13 and 13 are energized, and the generated electric heat is transmitted from the heat exchanger plates 6, 6 to the extrusion cylinder to heat it and extrude it.

When the extrusion cylinder is heated above a predetermined temperature, the temperature detection device is activated, water is passed through the water cooling pipes 8, 8 to cool it down, and when the extrusion cylinder is cooled to a predetermined temperature, the temperature detection device is activated. to stop water flow.

The heat exchanger plates are not limited to those shown in the above embodiments, but a pair of semicircular heat exchanger plates may be tightened into a cylindrical shape with a tightening band, or the shape of the heat exchanger plate may be changed to the shape of the heat exchanger plate to be heated. The design can be changed as appropriate, such as deforming according to the body.

The present invention is designed to retract both ends of a water cooling pipe cast into a heat transfer plate into the thickness of the heat transfer plate, without having to pull them out to the outside of the heat transfer plate, as in the case of soft clay, and to fix sockets to both ends of the water cooling pipe. Since both ends of the water-cooled pipe are covered with heat transfer plates, no excessive force is applied to both ends of the water-cooled pipe, which prevents cracks from forming at both ends of the water-cooled pipe and water leakage. This has the advantage of increasing the durability of the heater.

[Brief explanation of the drawing]

Figure 1 is a front view showing an example of a conventional heater with water cooling.
2 is a top view of FIG. 1, FIG. 3 is a front view showing an example of the heater with water cooling according to the present invention, and FIG. 4 is a top view of FIG. 3. 6.6...Heat exchange plate, 8,8...Water cooling pipe, 9,1
0...Both ends of the water cooling pipe, 11.12...Socket, 13.13...Heating wire.

Claims (1)

[Scope of utility model registration request] A heating wire such as a sheathed wire and a water cooling pipe for passing cooling water are cast into a heat transfer plate attached to an extrusion cylinder or other heated object in a synthetic resin extrusion molding machine. A water-cooled heater with both ends of the pipe drawn into the thickness of the heat transfer plate and sockets fixed to both ends.