JPH044394Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heater with a cooling tube that is provided on a cylindrical heated body for transporting fluid.

[Prior Art] This type of heater with a cooling tube is used for a cylindrical heated body such as an extrusion cylinder of a synthetic resin extrusion molding machine.

In a synthetic resin extrusion molding machine, at the beginning of operation, the temperature of the heated object 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, heaters with cooling tubes are sheathed heaters that are embedded within the thickness of heat exchanger plates 1a and 1b provided on an object to be heated (not shown) such as an extrusion cylinder. It has a heater 3 and cooling pipes 9 fixed to grooves 5 formed in the plate surfaces of heat transfer plates 1a and 1b via a filler 7 such as heat transfer cement.

In this heater with a cooling tube, heat exchanger plates 1a,
The ends of the heater 3 and cooling pipe 9 protrude outside 1b.

Therefore, in the event that the cooling pipe 9 is damaged or a large amount of water scale adheres to the inside of the cooling pipe 9, it is possible to remove the filler material 7 and replace it with a new cooling pipe 9.

(For example, there is Japanese Utility Model Application Publication No. 60-138732.) [Problem to be solved by the invention] However, the replacement work of the cooling pipe 9 requires completely removing the solidified filler material 7 inside the groove 5. There is a problem in that the work is time-consuming because it involves the work of installing a new cooling pipe 7 inside the groove 5 and filling it again with the filler material 7.

Furthermore, when the heater 3 is disconnected, there is a problem in that even though there is no abnormality in the cooling pipe 9 of the heater with a cooling pipe, all the cooling pipes must be replaced.

Therefore, an object of the present invention is to provide a heater with a cooling tube that can be easily replaced when a problem occurs in either the heater or the cooling tube.

[Means for Solving the Problems] According to the present invention, a pair of heat exchanger plates are provided in contact with the outer peripheral surface of a cylindrical heated body that transports fluid, and a heat exchanger plate provided on each of the outer peripheral surfaces of the heat exchanger plates. a pair of cover bodies, a pair of cooling pipes each drawn into a space formed between the cover body and the heat transfer plate, and a heat medium provided in the space; The heater with cooling tubes has a heater embedded in each of the plates, and the pair of cover bodies is removably attached to the pair of heat transfer plates, and the pair of heat transfer plates is fixed to the pair of heat transfer plates. The heater has a pair of protrusions with hot plates butted against each other, the heater has a terminal portion protruding from the protrusions, and the inlet and outlet ports of the cooling pipe are arranged near the protrusions. A heater with a cooling tube is obtained.

[Function] When the heater with cooling tube of the present invention is used, the object to be heated is heated by the heater of the heat exchanger plate, and when the object to be heated reaches a predetermined temperature or higher, it is cooled by the fluid flowing in the cooling tube to a constant temperature. Keep heated object at temperature.

When a heater breaks down, the heat exchanger plate that includes the faulty heater is replaced. Also, when a cooling pipe breaks down, only the faulty cooling pipe is replaced.

[Embodiment] FIGS. 1 to 3 show an embodiment of the heater with cooling tube of the present invention.

The illustrated heater with a cooling tube has a heat transfer plate 11 having an inner circumferential surface that comes into contact with an outer circumferential surface of a cylindrical heated body that transports fluid. The heat transfer plates 11 are a pair of heat transfer plate pieces 1 formed into a semicircular shape using a material that easily conducts heat such as aluminum, brass, boron, or iron.
2a and 12b are pressed against each other in a cylindrical shape, and the entire inner circumferential surface thereof is shaped so as to be in contact with the outer circumferential surface of the object to be heated. Heaters 13a and 13b, such as sheathed heaters, are embedded within the thickness of the heat transfer plate pieces 12a and 12b. Cover bodies 15a, 15b are provided on the outer peripheral surfaces of the heat transfer plate pieces 12a, 12b.
The cover bodies 15a, 15b are heat transfer plate pieces 12a, 12
b is removably fixed using a screw 18 as a fixing means.

Heat exchanger plate pieces 12a, 12b and cover bodies 15a, 1
Cooling pipes 19a and 19b are provided in the space between the cooling pipe 5b and the cooling pipe 5b.

The ends of the cooling pipes 19a and 19b are covered with a cover body 15.
It protrudes outside of a and 15b.

In addition, the heat transfer plate pieces 12a, 12b and the cover body 15
A heat medium 22 is provided in the space between the a and 15b. The heat medium 22 is made of granular aluminum, zircon, alumina, etc., which have excellent thermal conductivity.
Glass beads, magnesia, etc. alone or in combination are used.

Incidentally, protrusions 25 are formed at the ends of the heat transfer plate pieces 12a, 12b so that they face each other when they are butted against each other.

The combined protrusions 25 are fixed using bolts 28 or the like, thereby completing the cylindrical heat transfer plate pieces 12a, 12b.

Now, when making a heater with a cooling tube like this,
It is carried out in the following steps.

First, heat transfer plate pieces 12a and 12b in which heaters 13a and 13b are embedded by casting are made.

At this time, the terminal portions 30 of the heaters 13a and 13b
a, 30b are the protrusions 2 of the heat transfer plate pieces 12a, 12b.
It is formed to protrude from 5.

Next, on the outer peripheral surfaces of the heat transfer plate pieces 12a and 12b,
Cooling pipes 19a, 19b are provided which are covered by cover bodies 15a, 15b with the outflow ports 33 and inflow ports 35 at the ends of the cooling pipes 19a, 19b being outside.

The cover bodies 15a, 15b are heat transfer plate pieces 12a, 1
It is integrally fixed to the outer peripheral surface of 2b with screws 18.

After that, a heat medium 22 is placed in the space between the heat transfer plate pieces 12a, 12b and the cover bodies 15a, 15b.
is filled.

The heat medium 22 is filled through holes (not shown) formed in the cover bodies 15a, 15b, and if the holes are then closed, otherwise, if the heat medium 22 uses heat transfer cement, the cover bodies 15a, After providing the cooling pipes 19a and 19b on the cover body 15b,
With the cooling pipes 19a and 19b fixed in advance by providing heat transfer cement inside the pipes a and 15b,
It can also be fixed to the heat transfer pieces 12a, 12b.

In this way, the heat transfer plate pieces 12a, 12b, the cover bodies 15, 15b, the heat medium 22, the cooling pipe 19a,
19b is integrated and provided on the heated body.

Therefore, the object to be heated is the heat transfer plate pieces 12a, 1
Heated by heaters 13a and 13b of 2b,
When the temperature of the object to be heated rises above a certain temperature, fluid is supplied into the cooling pipes 19a and 19b from the inlet 33 thereof, and fluid is discharged from the outlet 35.

This heater with a cooling tube includes heaters 13a and 13b.
Alternatively, if a problem occurs in the cooling pipes 19A, 19b, they are replaced.

When the heaters 13a, 13b fail, only the failed heat transfer plate piece 12a, 12b is replaced.

If a failure occurs in either one of the cooling pipes 19a, 19b, the failed cooling pipe 19a, 19b
The cover bodies 15a, 15b having the heat transfer plate pieces 12
a, 12b, and install a new cooling pipe 19a,
Replaced with 19b.

At this time, the heat medium 22 can be replaced with a new one, or the conventional heat medium 22 can be reused.

[Effects of the invention] As explained above with reference to the embodiments, according to the heater with a cooling tube of the present invention, when an abnormality occurs in either the heater or the cooling pipe, only the heat exchanger plate with the abnormality can be removed. All you have to do is replace it, and the work is easy.

Further, in particular, when the heater breaks down, it is not necessary to replace the entire heater with cooling tubes, and a substantially economical heater with cooling tubes can be provided. Furthermore, since the entrance and exit of the cooling pipe is arranged near the terminal portion, wiring and piping work are facilitated.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the heater with a cooling tube of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. FIG. 4 is a front view of a conventional heater with a cooling pipe, and FIG. 5 is a plan view with the cover removed.
-B sectional view. 1a, 1b... Heat exchanger plate piece, 3... Heater, 7...
...Filler, 9...Cooling pipe, 11...Heat exchange plate, 12
a, 12b... Heat exchanger plate piece, 13a, 13b... Heater, 15a, 15b... Cover body, 19a, 1
9b...Cooling pipe, 22...Heating medium.

Claims (1)

[Scope of utility model registration request] A pair of heat exchanger plates that come into contact with the outer peripheral surface of a cylindrical heated body that transports fluid, a pair of cover bodies provided on each of the outer peripheral surfaces of the heat exchanger plates, and between the cover body and the heat exchanger plates. In the heater with a cooling tube, the heater includes a pair of cooling tubes drawn into each of the formed spaces and a heat medium provided in the space, and has a heater embedded in each of the pair of heat transfer plates. The pair of cover bodies are removably attached to the pair of heat exchanger plates, and the pair of heat exchanger plates have a pair of protrusions that abut the pair of heat exchanger plates against each other. A heater with a cooling tube, characterized in that the heater has a terminal portion protruding from the protrusion, and an inlet and an outlet of the cooling tube are arranged near the protrusion.