JPH0552475A - Structure for heat transfer bulkhead of vacuum drying oven and processing method of heat transfer bulkhead - Google Patents

Abstract

PURPOSE:To prevent the metallic fatigue of a heat transfer bulkhead by a method wherein the heat transfer bulkhead, defining the main body of an oven and hot-water jacket, is formed so as to have the shape of an arch bent and recessed toward the inner direction of the main body of the oven. CONSTITUTION:A recessed heat transfer bulkhead 3 is interposed between the main body 1 of an oven and a hot-water jacket 2. The bulkhead 3 is worked by a method wherein the bulkhead is pinched between the main body 1 of the oven and the hot-water jacket 2 while retaining the flat state of the bulkhead as it is to assemble them integrally, then, pressure fluid is introduced into the hot-water jacket 2 to pressurize the inside of the hot-water jacket 2 and inflate the bulkhead so as to be recessed toward the side of the main body 1 of the oven. In this case, fluid pressure, exceeding the elastic limit of a metallic plate constituting the heat transfer bulkhead 3, is applied on the inside of the hot-water jacket 2. The heat transfer bulkhead is provided with the arced sectional structure whereby a necessary strength can be obtained even when the thickness of the heat transfer bulkhead is thinned and heat transfer efficiency can be improved. On the other hand, the heat transfer bulkhead is not deformed by a pressure difference between the inside of the main body of the oven and the inside of the hot-water jacket, which is produced upon operating the oven, whereby the metallic fatigue of the heat transfer bulkhead can be eliminated and breakage such as cracking and the like can hardly occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a heat transfer partition of a vacuum drying kettle, particularly a vacuum drying kettle for drying food waste, and a method of processing the heat transfer partition to obtain the heat transfer partition structure.

[0002]

2. Description of the Related Art Generally, a vacuum drying pot is a vacuum pump for depressurizing the inside of the drying pot to lower the boiling point of water in the drying pot so as to evaporate the moisture of the material to be dried contained in the drying pot. The heat energy necessary for evaporation at that time is supplied from the outside through the heat transfer partition. In the conventional vacuum drying pot, the side peripheral surface of the pot is usually formed as a heat transfer partition.

[0003]

However, since the volume of the material to be dried decreases as the drying progresses and the height packed in the pot becomes lower, the upper portion of the heat transfer partition is dried as the drying progresses. Since it does not come into contact with the object and the area of that part gradually increases, the effective utilization rate of the supplied heat energy decreases as the drying progresses. Therefore,
It is conceivable to provide a heat transfer partition on the bottom surface of the kettle that is always in contact with the material to be dried regardless of the volume decrease due to the material to be dried.

It is desirable that the thickness of the heat transfer partition be as thin as possible in order to improve the heat transfer efficiency. Especially, when the heat transfer partition is provided on the bottom surface of the kettle as described above, the side wall surface of the kettle is transferred. Since the area of the heat transfer partition is inevitably smaller than that in the case of using the heat partition, the necessity thereof is increased. However, in the vacuum drying pot, there is no pressure difference between the inside and outside of the heat transfer partition during the stop of operation, but the pressure inside the pot is reduced during operation, so a pressure difference of approximately 1 kg / cm ² occurs inside and outside the heat transfer partition. Therefore, if the heat transfer partition is thin, the heat transfer partition is deformed due to the pressure difference. Therefore, the heat transfer partition is deformed during the operation of the vacuum drying oven, and when the operation is stopped, it is repeatedly restored to its original state, and metal fatigue caused by repeated deformation and restoration causes damage such as cracks. Cheap.

Further, a vacuum drying pot, particularly a drying pot for treating food waste, is provided with a rotary spatula to prevent the paste-like component of the material to be dried from adhering to the heat transfer partition wall and hindering heat transfer. Although it is necessary to scrape off the components to prevent the pasty components from adhering, when the heat transfer partition is deformed as described above, a gap is created between the heat transfer partition and the spatula. Then, if a gap is formed at one end, solids are successively fitted into the gap, and the pasty component is attached.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to operate even if the structure of the heat transfer partition of the vacuum drying pot is thinned to improve heat transfer. As a structure that does not easily deform due to the internal and external pressure difference, prevent metal fatigue of the heat transfer partition due to repeated deformation and restoration, and prevent the formation of a gap between the heat transfer partition and the rotating spatula. It is in. Another object of the present invention is to easily obtain the heat transfer partition having the above structure without using a large-scale device or cost.

[0007]

In order to achieve the above object, the heat transfer partition of the vacuum drying pot of the present invention is provided at the inner bottom of the vacuum drying pot so as to divide the pot body and the hot water jacket,
It is formed in an arch shape that is curved in a convex shape toward the inside of the shuttle body. The heat transfer partition is formed by partitioning the heat transfer partition into a hot water jacket formed by being separated from the main body by a flat heat transfer partition during the manufacturing process of the vacuum drying kettle, and applying a fluid pressure exceeding the elastic limit of the heat transfer partition. Is processed into an arch shape by bulging the inside of the hook body.

[0008]

The heat transfer partition of the vacuum drying kettle configured as described above has an arch-shaped cross section, and therefore is strong against both the load from the pot body side and the load from the hot water jacket side. keep. Further, also in the processing for obtaining the arch-shaped cross-sectional structure, it is sufficient to apply the fluid pressure to the hot water jacket, and no special device such as a press device or a tool is required.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a hot water jacket is provided at the bottom of the kettle, and the heat energy required to evaporate the water content of the material to be dried is introduced from the hot water. The vacuum drying kettle A includes the kettle body 1 and the hot water jacket 2. Are vertically defined by the heat transfer partition wall 3.

The pot main body 1 is formed in a container shape having an open lower surface, and an upper surface thereof has an inlet 4 for a material to be dried and a steam outlet 5 for guiding water evaporated from the material to be dried to a condenser. Is provided, and a take-out port 6 for taking out the dried product after processing is provided on the side surface. Further, in order to withstand the pressure in the depressurized state during the operation of the hook main body 1, the side wall and the ceiling wall are formed in a round shape, that is, the side wall is formed in a cylindrical shape and the ceiling wall is bulged upward, and the plate thickness is thick. Things are used.

On the other hand, the hot water jacket 2 is formed in a container shape having an opening on the upper surface corresponding to the opening on the bottom surface of the pot main body 1, and a hot water inflow portion 7 and a hot water outflow portion 8 are provided on the bottom surface portion, respectively. ing. A bearing 9 is provided at the center of the bottom surface of the high-temperature water jacket 2 so as to be positioned inside the jacket 2, and a rotary shaft 10 of a motor (not shown) arranged outside the bottom surface of the jacket 2 is provided as described above. The bearing portion 9 is rotatably and airtightly penetrated to extend upward. This bearing part 9 has the jacket 2 except the center part.
It is formed at almost the same height as the depth of, and only the center is slightly higher than that.

The pot main body 1 and the hot water jacket 2 have their openings opposed to each other, and a heat transfer partition wall 3 is interposed between the two, so that they are integrally connected and fixed. The three members are joined and fixed by sandwiching the peripheral edge of the heat transfer partition wall 3 between the flanges 11 and 12 provided in the openings of the pot main body 1 and the hot water jacket 2 respectively, and bolts and nuts not shown. Although not shown in the drawing, packing is inserted between the flanges 11 and 12 and the heat transfer partition wall 3 in order to make the portion airtight.

The heat transfer partition wall 3 is made of a metal plate whose thickness is as thin as possible in order to improve heat transfer efficiency, and has an outer diameter substantially the same as that of the flanges 11 and 12 of the pot main body 1 and the hot water jacket 2.
The bearing body 9 is formed in an annular disc having an inner diameter substantially the same as that of a portion formed higher in the central portion of the bearing portion 9.
And the hot water jacket 2 so as to partition the two, and the outer peripheral edge is clamped and fixed to the flanges 11 and 12, and the inner peripheral edge is sandwiched between the upper and lower annular discs 13 and 14 to form the disc 13. , 14 together with the bearing 9 are fixed to the bearing 9 by screws 15. The heat transfer partition wall 3 is provided between the inner and outer peripheral edges of the pot main body 1.
It is formed in a structure with an arch-shaped cross section that bulges to the side.

The heat transfer partition wall 3 is first formed into a flat circular disk, but is processed into an arch-shaped cross section structure in the assembly stage of the vacuum drying pot A. That is, the heat transfer partition 3 is
By sandwiching between the pot body 1 and the warm water jacket 2 in a flat state and assembling them together, and then introducing a pressure fluid into the warm water jacket 2 to pressurize the warm water jacket, the pot body 1 side Bulge into an arch. At this time, the fluid pressure applied to the inside of the hot water jacket 2 is set to a pressure exceeding the elastic limit of the metal plate constituting the heat transfer partition 3 so that the heat transfer partition 3 after the pressure release does not return to the original flat shape. It is necessary.

The paste-like component of the material to be dried is introduced into the hot water jacket 2 on the rotary shaft 10 of the motor, which extends through the bearing portion into the pot body 1 and adheres to the heat transfer partition wall. In order to prevent heat transfer from hot water from being hindered, a spatula 16 is used to scrape off the pasty components to prevent the pasty components from adhering, and a fork 17 for loosening the dried objects so that they do not harden, arms 18 and 19 respectively. It is attached via. The spatula 16 also serves as a scraping tool for scraping the dried product to the take-out port 5 so that the dry product can be removed from the center line of the rotating shaft as shown in FIG. The lower end edge is elastically pressed against the heat transfer partition wall 3 by a spring (not shown), and the lower end edge is elastically connected to the heat transfer partition wall 3.
It is formed in a shape that follows the arch shape of.

[0016]

[Effects] Since the present invention is configured as described above, it has the following effects. (1) Since the heat transfer partition has an arch-shaped cross-sectional structure, the required strength can be obtained even if the plate thickness of the heat transfer partition is reduced. Therefore, it becomes possible to improve the heat transfer efficiency by using a thin plate for the heat transfer partition. Even if a thin plate is used for the heat transfer partition to improve heat transfer efficiency, the heat transfer partition will not be deformed due to the pressure difference between the pot main body and the hot water jacket that occurs during operation. There is no metal fatigue of the heat transfer partition due to repeated deformation and restoration, and therefore damage such as cracks due to metal fatigue hardly occurs. Further, since the heat transfer partition wall is not deformed due to the pressure difference between the inside of the kettle body and the inside of the hot water jacket generated during operation, the heat transfer partition wall and the rotating spatula for preventing adhesion of the pasty component to the heat transfer partition wall. There is no gap between the two, and there is no inconvenience that the solid substance of the material to be dried is fitted between the two and the paste-like component adheres to the heat transfer partition wall to deteriorate the heat transfer efficiency.

(2) The heat transfer partition wall is bulged and convex toward the main body of the tank by introducing a pressure fluid into the hot water jacket to apply a pressure exceeding the elastic limit of the heat transfer partition wall at the manufacturing stage of the vacuum drying kettle. Since it is processed into a uniform cross-sectional structure, there is no need for a processing device or tools, and the processing can be carried out easily and inexpensively.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a vacuum drying pot showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view.

FIG. 3 is a vertical cross-sectional view showing a processed state of a heat transfer partition.

[Explanation of symbols]

 A vacuum drying pot 1 pot main body 2 hot water jacket 3 heat transfer partition

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[Procedure amendment]

[Submission date] February 5, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction content]

Further, a vacuum drying pot, particularly a drying pot for treating food waste, is provided with a rotary spatula to prevent the paste-like component of the material to be dried from adhering to the heat transfer partition wall and hindering heat transfer. Although it is necessary to scrape off the components to prevent the pasty components from adhering, when the heat transfer partition is deformed as described above, a gap is created between the heat transfer partition and the spatula. Then, once a gap is formed, the solid matter is successively fitted into the gap, which causes the pasty component to adhere.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

On the other hand, the hot water jacket 2 is formed in a container shape having an opening on the upper surface corresponding to the opening on the bottom surface of the pot main body 1, and a hot water inflow portion 7 and a hot water outflow portion 8 are provided on the bottom surface portion, respectively. ing. A bearing portion 9 is provided at the center of the bottom surface of the hot water jacket 2 so as to be positioned inside the jacket 2, and a rotary shaft 10 of a motor (not shown) arranged outside the bottom surface of the jacket 2 is used as the bearing. The portion 9 is rotatably and airtightly penetrated to extend upward. This bearing part 9 has the jacket 2 except the center part.
It is formed at almost the same height as the depth of, and only the center is slightly higher than that.

Claims (2)

[Claims] 1. A vacuum drying pot, which is provided at the inner bottom of the pot so as to define a pot main body and a hot water jacket, and has a partially arched shape that curves in a convex shape toward the inside of the pot main body. The structure of the heat transfer partition of the vacuum drying pot. 2. A pressure fluid is introduced into a hot water jacket formed by dividing the inside of the pot main body by a flat heat transfer partition to apply a fluid pressure exceeding the elastic limit of the heat transfer partition during the manufacturing process of the vacuum drying kettle. The heat transfer partition wall is bulged to the inside of the pot main body by means of