JPS608714Y2 - microwave heating device - Google Patents

Description

[Detailed description of the invention] Technical field> The present invention relates to a microwave heating device in which a microwave-transparent pipe is passed through a microwave heating chamber so that an object to be heated passes through the pipe. The device is useful for sterilizing objects to be heated or for forming dough products such as sausages.

<Background Art> In this type of device, the pressure inside the pipe tends to be high, and therefore the heated object inside the pipe tends to reach a high temperature of close to 100°C or higher, and therefore the pipe itself also tends to reach a high temperature. Thermal expansion of pipes becomes a problem as they are exposed to such high temperatures.

Usually, pipes are made of Teflon, which has a coefficient of thermal expansion of 1.3 x 10-6/°C, so the pipe will elongate by about 1.40 per meter at a temperature of 130°C, for example.

However, in the past, such thermal expansion of the pipe was not considered at all, and the pipe was fixedly attached to the microwave heating chamber.

For this reason, when the pipe expands thermally, the pipe bends inside the heating chamber, and the load condition inside the heating chamber changes, causing the microwave matching between the microwave source and the heating chamber to collapse, resulting in insufficient heating temperature. There was a fear that I wouldn't be able to get it.

<Disclosure of the Invention> The present invention is characterized in that the pipe is attached to the heating chamber by an expandable holder, and the holder can absorb the thermal expansion of the pipe.

<Example> FIG. 1 shows an apparatus according to an embodiment of the present invention.

Microwaves generated by microwave source 1 are transmitted through waveguide 2
It is supplied to the heating chamber 3 through.

A microwave-transparent main pipe 4 passes through the heating chamber 3, and the material to be heated, such as a paste, accumulated in the hopper 5 is transferred to the main pipe through a flexible pipe 7 and a metal pipe 8a by the action of a pressure pump 6. Sent into 4.

The object to be heated passing through the main pipe 4 is heated by microwaves and is discharged from the metal pipe 8b on the exit side.

Therefore, when the object to be heated is a sausage paste material, sausages shaped according to the inner shape of the main pipe 4 are continuously extruded from the outlet side metal pipe 8b.

Furthermore, if a pressure valve is provided outside the outlet side metal pipe 8b to increase the pressure inside the main pipe 4, the object to be heated can be sterilized at high temperature.

According to the features of the invention, the main pipe 4 has at both ends:
It is attached to the heating chamber 3 by telescopic holders 9a and 9b.

The left and right holders 9a and 9b have the same structure, and FIG. 2 shows the details of the one on the right.

Threads are cut on the outer periphery of the right end of the main pipe 4 and the outer periphery of the left end of the metal pipe 8b, and the right end of the main pipe 4 and the left end of the metal pipe 8b are screwed into a cylinder 10 with threads carved on the inner surface.

The expandable metal bellows 11 coaxially surrounds the cylinder 10, and is screwed to the collar 12 of the metal pipe 8b at its right end, and screwed to the heating chamber wall 3a at its left end. Expansion due to heat is absorbed by the metal bellows 11.

At this time, the heating chamber 3 includes a metal bellows 11 and a metal pipe 8.
b maintains the microwave sealed state.

In this embodiment, the main pipe 4 is held at both ends by expandable holding bodies 9a and 9b, and therefore the flexible pipe 7 absorbs the movement of the left metal pipe 8a when the main pipe 4 thermally expands.

If the left side of the main pipe 4 is fixedly arranged, the flexible pipe 7 is not necessary.

Further, in the above embodiment, if the inner diameter of the left end of the metal pipe 8b is made large, the inner diameter thereof is threaded, and the metal pipe 8b is screwed into the outer surface of the right end of the main pipe 4, it is unnecessary for the cylinder 10.

<Effects> Since the thermal expansion of the pipe is absorbed, the pipe does not curve, and the load condition within the heating chamber can be kept constant.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of an embodiment of the present invention;
FIG. 2 is an enlarged sectional view of the same main part. 3...Microwave heating chamber, 4...Main pipe, 9at9b...Holding body.

Claims (1)

[Scope of utility model registration request] A device in which a microwave-transparent pipe is passed through a microwave heating chamber so that the object to be heated passes through the pipe, and the pipe is attached to the heating chamber by a telescopic holder. Microwave heating device.