JPH0733676Y2 - Granular food heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heating device for heating (roasting) granular food such as coffee beans, and more particularly to prevention of excessive temperature rise in a heating furnace.

(Prior Art) In heating and cooking coffee beans, the coffee beans are heated (roasted) and then immediately cooled so that the flavor and aroma of the coffee beans are produced. In this case, how to set roasting temperature, roasting time, cooling characteristics after roasting, etc. are important factors for improving the quality of coffee beans.

And, the Japanese Patent Application No. 1-36990 previously filed by the applicant.
The granular food heating device described in the specification moves coffee beans after roasting from the roasting drum into the cooling drum, and cools the coffee beans by the endothermic action of the air sucked by the intake blower. There is.

(Problems to be solved by the invention) However, according to the conventional heating apparatus for granular food, when the coffee beans are being cooled in the cooling drum, there is no coffee beans in the roasting drum in the heating furnace. Since the heater is energized, the temperature of the roasting drum in the heating furnace may rise too much due to the radiant heat of the heater.

For example, the temperature inside the heating furnace after roasting reaches 280 ° C in about 5 minutes from 190 ° C, and if the temperature is raised too much, the next time coffee beans are put in the roasting drum, the coffee beans are immediately surface-polished by surface baking. Since it hardens and evaporation of water and the like from the inside of the coffee beans is suppressed, there is a problem that the coffee beans cannot be roasted evenly to the inside and the quality of the coffee beans is deteriorated.

In order to solve this problem, if the heater in the heating furnace after roasting is cut off, it takes a long time to raise the temperature in the heating furnace to a predetermined temperature when roasting coffee beans next time, It wastes power consumption and heating time.

The present invention has been made in order to solve such a problem, and prevents excessive temperature rise in the heating furnace, so that the next roasting of coffee beans can be quickly and energy-saving. It is an object to provide a heating device for use.

(Means for Solving the Problems) Therefore, the heating device for granular food according to the first aspect of the present invention is provided with a heating furnace formed of a heat insulating material and rotatably provided in the heating furnace. A bottomed cylindrical roasting drum having, a bottomed cylindrical cooling drum that has a large number of small holes and cools coffee beans after roasting, and an exhaust passage that releases exhaust gas from the roasting drum, A cooling exhaust passage that joins the exhaust passage and escapes exhaust air from a cooling drum, a flow path switching damper provided at a confluence portion of the exhaust passage and the cooling exhaust passage, and an exhaust passage provided with the roasting drum. A heating device for granular foods, comprising: an intake blower for sucking air inside or in the cooling drum, the intake device being branched from an exhaust passage on an upstream side of a confluence of the exhaust passage and the cooling exhaust passage. Merges into the exhaust passage on the downstream side of the blower A bypass exhaust passage is provided, and when the flow path switching damper is opened to the cooling drum side, the exhaust from the roasting drum is caused to flow through the bypass exhaust passage to be sucked and removed by the jet exhaust flow of the intake blower, and the bypass is also provided. The present invention is characterized in that a flow path switching damper for preventing excessive temperature rise in the heating furnace is attached to a branch portion of the exhaust passage with the exhaust passage.

(Operation) According to the granular food heating device of the present invention, when the cooling drum is being ventilated, the exhaust air in the roasting drum is sucked and removed by the intake blower through the bypass exhaust passage. Since the exhaust gas from the heating furnace is discharged to the outside through the exhaust passage and the bypass exhaust passage while the coffee beans are being cooled, the temperature rise of the roasting drum in the heating furnace is prevented.

At this time, since the inside of the heating furnace is kept at a certain temperature or higher, it is possible to quickly and uniformly roast the coffee beans to be put into the roasting drum next time.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 2 to 4, a funnel-shaped hopper 2 for charging coffee beans to be heated is provided on an upper portion of a frame 1 of the heating device, and the hopper 2 is formed by an inner peripheral surface. The passage is gradually narrowed from the middle to the bottom, and the lower end 2a thereof is connected to the upper end 3a of the coffee bean passage 3.

The coffee bean passage 3 extending vertically downward is bent from the middle of the coffee bean passage 3b and is inclined and inclined.
Is open at the furnace end opening surface 10a. On the other hand, an exhaust passage 5 extending horizontally rearward (to the left in FIG. 2) is branched from the upper end of the coffee bean passage 3, and a shutter 6 for selectively switching between coffee bean input and exhaust discharge at the branch portion.
Is mounted so as to be swingable by a shutter handle 6a about a fulcrum 7.

The bottomed cylindrical roasting drum 13 provided in the heating furnace 10,
The axis of rotation is arranged so as to be horizontal, and its opening surface 14 faces the parallel to the furnace end opening surface 10a and is provided with a gap. This gap is, for example, 1-2 m
adjusted to m. As a result, the coffee beans from the above-mentioned inclined passage 3b are taken into the roasting drum 13 from the furnace end opening surface 10a through the opening surface 14, and at that time, the coffee beans do not drop from the gap.

The cylindrical main body 15 of the roasting drum 13 is made of punching metal, and has a large number of small holes 43, for example, round holes, of a size that prevents coffee beans communicating between the inside and the outside of the drum from passing through.
The bottomed disc portion 16 of the roasting drum 13 is formed of a punching metal into a disc shape, and a large number of small holes 43 communicating the inside and outside of the drum are formed. The aperture ratio of a large number of small holes 43 formed in the cylindrical body 15 and the bottomed disc portion 16 is set to 20 to 70%. This is because the radiant heat from the infrared heater 12 in which a heating element such as a planar nichrome wire, which will be described later, is embedded in ceramics is too strong, and the moisture and carbon dioxide gas from the inside of the beans do not completely escape and the surface is hardened. This is to accelerate the heating of the coffee beans in the drum while adjusting the heat to be transmitted through the small holes to prevent the coffee beans from being lost.

On the inner peripheral wall of the cylindrical main body 15, there are provided two thin plate-shaped feed blades 30a and 30b having a predetermined width for feeding the coffee beans taken into the drum 13 from the opening surface 14 to the bottomed disc portion 16 side during rotation. They are provided in a spiral shape at positions displaced by 180 degrees with respect to the axis. Two thin strip-shaped return blades 31a and 31b provided on the inner peripheral wall in a direction intersecting these feed blades 30a and 30b.
Is for pushing the coffee beans taken into the drum 13 toward the opening surface 14 as the drum rotates. Feeding blades 30a, 3
A large number of small holes are opened in 0b and the return blades 31a, 31b.

A drive shaft 17 extending into the drum is fixed to the boss portion 16a of the bottomed disc portion 16 of the roasting drum 13, and radial spokes 18 are provided in the middle of the drive shaft 17.
The other end of the spoke is fixed to the outer peripheral end of the cylindrical body 15.
The roasting drum 13 is fixedly supported by the drive shaft 17 by the spokes 18.

A drive shaft 17 fixed to the roasting drum 13 is rotatably supported by bearings 19 and 20 through an insertion hole 10c of a furnace end closing surface 10b, and a sprocket 21 is fitted outside these bearings 20. The sprocket 21 is a chain 22 that is wound around a sprocket 23 driven by a drive motor 24.
Driven by.

On the inner peripheral wall surface 10b of the bottomed cylindrical heating furnace 10, an infrared heater 12 in which a heating element such as a nichrome wire having a planar shape extending in the front-rear direction of the heating furnace 10 is embedded in ceramics surrounds the roasting drum 13. Many are provided in. This infrared heater
It is desirable that 12 should surround the upper part of the roasting drum about 2/3 times and not be provided in the lower part of the roasting drum. This is to prevent coffee husks and chaff (skin) generated in the roasting drum from falling through the punching metal and accumulating on the infrared heater to generate a nasty smell.
Further, when the infrared heater 12 is heated, radiant heat is radiated through the small holes of the rotating roasting drum 13 into the drum together with the effect of the stirring blade. For this reason, moisture and carbon dioxide generated from inside the coffee beans do not form a boundary film on the surface of the coffee beans as heating progresses, and the inside of the coffee beans remains unroasted. There is no.

The roasting drum 13 is provided directly below the furnace end opening surface 10a of the heating furnace 10.
A temperature sensor 35 is provided on the inner wall of the furnace end facing the open surface 14 of the furnace.

At the furnace end located below the opening surface 10a of the heating furnace 10, a discharge port 60 through which roasted coffee beans are taken out is opened, and a discharge door is opened and closed by a handle 62 at the discharge port 60.
61 is attached so as to be rotatable about a rotation shaft 61a. Outside the discharge port 60, a discharge shooter 65 for causing the coffee beans after roasting to flow into a cooling drum 25 described later.
Is inclined and attached obliquely downward.

On the other hand, the cooling drum 25 provided directly below the roasting drum 13
Is arranged in the case 44 so as to be parallel and biaxial, and has the same structure as the roasting drum 13.
It has a and 46b and return vanes 47a and 47b. When the drum rotates, the feed blades 46a and 46b feed the coffee beans in the drum to the left in FIG. 1, and the return blades 47a and 47b feed the coffee beans to the right in FIG. And the cooling drum 25 is a drive shaft.
Drive shaft through 58, sprocket 48, chain 49
Interlocked with 17.

Next, the exhaust ventilation passage will be described in detail with reference to FIG.
The coffee bean passage 3 through which the exhaust gas from the roasting drum 13 flows is connected to the exhaust passage 5, communicates with an intake blower 51 provided in the middle of the exhaust passage 5, and the end of the exhaust passage 5 opens to the exhaust port 53. . A hose 50 connected from the cooling drum 25 is connected in the middle of the exhaust passage 5. A flow path switching damper 70 is provided at the connecting portion. A bypass exhaust passage 74 is branched from the exhaust passage 5 at the upstream portion of the flow path switching damper 70, and a downstream portion thereof is opened to the exhaust port 53 so that the exhaust flow is sucked by the exhaust flow of the intake blower 51. Bypass exhaust passage 74
A flow path switching damper 72 for preventing excessive temperature rise in the heating furnace is provided at the branch portion of the. When the damper 72 is switched as shown in FIG. 1, the air in the cooling drum 25 is discharged from the intake blower 51 to the outside through the exhaust port 53 through the hose 50 as shown by the dotted line. At the same time, the exhaust gas in the roasting drum 13 is discharged from the coffee bean passage 3 through the exhaust passage 5 through the bypass exhaust passage 74 to the outside through the exhaust port 53. Due to the jet exhaust flow of the intake blower 51, the exhaust in the bypass exhaust passage 74 is exhausted from the exhaust port 53 to the outside.

When the flow path switching damper 70 is switched to the cooling drum 25 side as shown in FIG. 1, the air inside the cooling drum 25 is exhausted from the intake blower 51 from the hose 50 through the exhaust passage 5 by the suction action of the intake blower 51. It is discharged to the outside via 53. At this time, since a negative pressure is generated in the case 44, the bottom plate 56 of the case 44 is
The coffee bean shells and chaff that have fallen through the holes provided in the cooling drum 25 are sucked and removed. Further, the suction accelerates the cooling of the coffee beans.

When the flow path switching damper 70 is switched to the roasting drum side, the exhaust gas generated in the roasting drum 13 at the time of roasting rises from the opening surface 14 to the inclined passage 3b and the coffee bean passage 3 to the coffee bean passage 3. After passing through the exhaust passage 5 connected thereto, it is sucked by the intake blower 51 provided on the downstream side of the exhaust passage 5 and discharged to the outside through the exhaust port 53.

Next, the operation of the embodiment of the present invention will be described.

Coffee beans introduced from the hopper 2 flow into the roasting drum 13 through the coffee bean passage 3 and the inclined passage 3b through the opening surface 10a. When the roasting drum 13 is rotated, the coffee beans that have flowed into the roasting drum 13 are heated by the radiant heat from the infrared heater 12 while being stirred by the feed blades 30a and 30b and the return blades 31a and 31b (roasting). ) Will be done.

At this time, a part of the coffee beans in the roasting drum 13 is floated up into the air in the drum, and the remaining part is pushed to the bottomed disk portion 16 side by the feed blades 30a and 30b as the drum rotates. The return blades 31a and 31b push the sheet toward the opening surface 14. Therefore, some of the coffee beans are soared in the air while being reciprocated uniformly in the drum axis direction and stirred and distributed, so that the radiant heat from the infrared heater 12 allows roasting to proceed uniformly and in a short time. Roasting drum
The exhaust gas in 13 is discharged to the outside from the exhaust port 53 through the coffee bean passage 3, the exhaust passage 5, and the intake blower 51.

When roasting is completed, the discharge door 61 is opened to the position indicated by the alternate long and short dash line in FIG. 1, and the roasted coffee beans in the roasting drum 13 slide on the discharge chute 65 through the discharge port 60 and the cooling drum.
Moved to 25.

The coffee beans moved into the cooling drum 25 are partly floated up in the air as the drum rotates, and are evenly distributed in the drum axial direction by the feed blades 46a and 46b and the return blades 47a and 47b. . At this time, the remaining shells mixed with the roasted beans pass through the small holes of the drum to the bottom plate.
Fall to 56. Then, the suction force of the intake blower 51 sucks the shell of the bottom plate 56 of the case 44, and the circulating air is blown up into the air by the stirring blades, or heat is taken from the coffee beans diffused in the front-back direction, and this heat is absorbed. The taken air is discharged from the hose 50, the intake blower 51, and the exhaust port 53. Therefore, the coffee beans in the cooling drum 25 do not involve the atmosphere outside the roasting device, so that the cooling is not only speeded up, but also moisture and odors in the atmosphere are hardly adsorbed.

When the coffee beans are cooled, as shown in FIG. 1, the flow path switching damper 70 and the flow path switching damper 72 for preventing overheating in the heating furnace are switched, so that the exhaust air in the roasting drum 13 is exhausted from the coffee beans. From the passage 3 through the exhaust passage 5, the bypass exhaust passage 74 is discharged to the outside from the exhaust port 53 by the jet exhaust flow of the intake blower 51 as shown by the dotted line. For this reason, the temperature in the heating furnace 10 does not rise rapidly, and the excessive temperature rise in the roasting drum 13 is prevented.
When coffee beans are put into the roasting drum 13 via
The coffee beans are uniformly heated and roasted in the next roasting mode without being rapidly heated.

(Effect of the Invention) As described above, according to the heating apparatus for granular food of the present invention, the exhaust air in the cooling drum is exhausted to the outside through the exhaust port by the intake blower after the roasting is completed, and the roasting drum is also exhausted. Since the air inside is positively discharged to the outside by the jet exhaust flow of the intake blower through the exhaust passage and the bypass exhaust passage, overheating in the heating furnace is prevented and the next coffee bean is heated quickly. This has the effect of enabling uniform roasting of coffee beans.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an exhaust system of a heating apparatus for granular food according to an embodiment of the present invention, FIG. 2 is a schematic sectional view showing an embodiment of the present invention, and FIG. 3 is a III direction shown in FIG. Arrow view,
FIG. 4 is a view in the direction of the arrow IV shown in FIG. 3 ... coffee bean passage (exhaust passage), 5 ... exhaust passage,
10 …… heating furnace, 13 …… roasting drum, 25 …… cooling drum,
50 …… Hose (cooling exhaust passage), 70 …… Flow path switching damper, 72 …… Flow path switching damper for preventing excessive temperature rise in heating furnace, 74…
… Bypass exhaust passage.

Claims (1)

[Scope of utility model registration request] 1. A heating furnace formed of a heat insulating material, a cylindrical roasting drum having a bottom, which is rotatably provided in the heating furnace and has many small holes, and a roasting machine having many small holes. A cylindrical cooling drum with a bottom for cooling the coffee beans after roasting, an exhaust passage for releasing the exhaust air from the roasting drum, a cooling exhaust passage that joins the exhaust passage and escapes the exhaust air from the cooling drum, and the exhaust gas For granular food products provided with a flow path switching damper provided at a confluence portion of a passage and the cooling exhaust passage, and an intake blower provided in the exhaust passage for sucking air in the roasting drum or the cooling drum. A heating device, wherein a bypass exhaust passage branched from an exhaust passage on an upstream side of a confluence portion of the exhaust passage and the cooling exhaust passage and joined to an exhaust passage on a downstream side of the intake blower is provided. Damper on the cooling drum side When it is set, the exhaust gas from the roasting drum is flown into the bypass exhaust passage to be sucked and removed by the jet exhaust flow of the intake blower, and the temperature rise in the heating furnace is excessive at the branch portion of the bypass exhaust passage with the exhaust passage. A heating device for granular foods, which is equipped with a flow path switching damper for prevention.