JPH0423976A - Roasting machine for coffee bean or the like - Google Patents

Abstract

PURPOSE:To enhance uniformity of temperature of coffee beans and enable precise roasting by providing a radiation heating chamber and enabling combination of convection heating and radiation heating. CONSTITUTION:Raw beans of a definite amount of coffee, etc., are charged from a hopper 16 into a roasting chamber 1 and shutter 17 is closed. Heated air passes through a conduct tube 6 and heats outer wall 5 of the roasting chamber 1 and then is jetted upward from a jetting hole 7 of the lower end in the roasting chamber 1 toward the inside of flow path separating cylinder 13 in the roasting chamber 1. The raw beans raises the inside of a flow path- separating cylinder 13 while heating the inside in convection by the jet and lowers annular pathways 10 and 11 composed of a glass tube 14 and flow path- separating cylinder 13 and is subjected to radiation heating and pushed out to the inside of flow and raises the inside of flow path while heating the inside in convection and the beans are uniformly roasted while repeating the above- mentioned operation.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a roasting machine for coffee beans, etc., and more specifically, by roasting coffee beans, etc., the grassy odor and astringency are eliminated, and the coffee beans, etc. are roasted. The flavor and aroma are brought out, but roasting is an extremely complex and delicate process, as even the same green coffee beans can produce a wide variety of flavors depending on how they are roasted. SUMMARY OF THE INVENTION The present invention provides a roasting machine for coffee beans, etc., which enables precise control to roast coffee beans according to the operator's wishes.

<Prior Art> Various types of roasting machines for coffee beans and the like have been conventionally provided. The main conventional techniques and their problems are described below. First, the heating method for coffee beans in conventional jet roasters is only convection (jet) heat transfer, and a large amount of heat is radiated from the walls of the convection chamber to the outside air. Since the amount of heat must be supplied to the beans, high-temperature hot air is required, which results in poor uniformity between the surface and center temperatures of the beans and poor thermal efficiency.

In addition, in conventional jet roasters that do not have flow path separation tubes, when coffee beans are flowed with a jet stream, coffee beans that are rising and coffee beans that are descending interfere with each other and obstruct the flow path. Since this was an energy loss, a large amount of kinetic energy of air, that is, economically speaking, a large amount of air is required.

When the amount of air increases, exhaust gas loss increases and thermal efficiency deteriorates, and the cooling device for connecting the exhaust gas to the building duct becomes large. Also,
If you adjust the amount of jet air too much, the resistance of the coffee beans will cause
Air becomes difficult to flow, the amount of air passing through the heater decreases, and the air temperature and internal temperature of the heater rise abnormally.
There was also the problem that the life of the heating wire was shortened.

A specific example of such prior art is ``Method and Apparatus for Preparing Coffee'' (Japanese Patent Publication No. 55-467).
No. 05), this technology is based on the following: ``...by supplying hot air to the main body, the floating motion of the coffee beans has a double spiral trajectory of a horizontal spiral that forces an upward movement and a vertical spiral that forces a downward movement. In the technology of "giving coffee" and the "coffee bean roaster" (Utility Model Publication No. 58-10465),
``A funnel-shaped roasting container with a wire mesh at the bottom is removably attached to the fuselage, and a blower and air heating means are installed inside the fuselage.
The air exhaust passage is configured to allow the hot air from the blast heating means to pass upward through the roasting container from the bottom of the roasting container, and the air exhaust passage is connected to the upper opening of the roasting container at the upper part of the body. A technology in which a dust collection bag is provided at the opening of a passageway is shown, and a technology for roasting coffee beans (in 1983) is shown.
-35037) is a funnel-shaped roasting container with a heat-resistant filter installed at the lower end opening that can be attached to and removed from the machine in an upright position, an air blower installed inside the machine, and a blower that can be used to dry and roast coffee beans. A heating unit that heats the air and sends it from the bottom end of the roasting container to the top of the container, and a heating unit that is installed at the top of the machine and is removably connected to the top end of the roasting container, and passes through the roasting container. an exhaust passage that forms a passage for the exhausted air, a part of the dust collection container that is removably provided, an exhaust port that sends the exhaust that has passed through the dust collection container outside the aircraft, and a roasting container that contains coffee beans in a roasting container. The roasting device is equipped with a timer that sets the roasting time and operates the blower and air heating means, and a temperature control mechanism that controls the temperature of the hot air passing through the roasting container by controlling the operation of the air heating section. It is something to do. Furthermore, in ``Method and Apparatus for Roasting Coffee Beans'' (Japanese Unexamined Patent Publication No. 57-110146), ``a required amount of coffee beans is placed in an upright funnel-shaped roasting container, and hot air is introduced from the bottom of the container. ``Coffee bean roasting machine'' (Special Publication No. 56-1998'6) issue)
Well then.

"In a coffee roasting machine that roasts green coffee beans,
A temperature sensing element inserted between the coffee beans that are being stirred and roasted allows all processes from roasting the coffee beans put into the coffee roaster to detecting the completion of roasting, and from cooling to detecting the completion of cooling to be performed in one room. A "coffee roasting machine capable of continuous operation in a process" is disclosed. and,
Furthermore, the "roaster" (Utility Model Publication No. 62-42718)
"Between the combustion chamber equipped with a burner and the roasting chamber above it, one side of a rectifier plate having a large number of through holes is supported so as to be freely angularly displaceable around a horizontal axis of rotation. A horizontal position for retaining raw materials and a tilted position for discharging raw materials are possible.At both ends of the rotation axis of the current plate, there are material fall prevention plates that are in constant contact with the top surface of the current plate and can be moved up and down. However, in any of these technologies, the present invention utilizes a combination of convection heating and radiant heating, and a flow path separation cylinder that makes this possible is one of the essential components. There is no roaster available that allows precise control.

<Problems to be Solved by the Invention> The present invention corrects all of the drawbacks and problems of the prior art, and is characterized by the following:
In order to increase the show effect at coffee shops, etc., in a jet roasting machine using glass tubes, it is necessary to reduce the amount of jet air in order to increase thermal efficiency and reduce energy consumption. If the amount is reduced, the flow of coffee beans will decrease, and the roasting ability and show effect, which are the characteristics of a jet roaster, will decrease. The present invention provides an invention that solves all of these problems, achieves both energy saving and in-store display effects, and further enables precision roasting.

The present invention has a structure in which the lower part of the jet roaster where the beans are held is made into a cylindrical or trap-shaped radiant heating chamber, and the jet air is directed upward and ejected from the central lower end of the chamber. jet (initial jet velocity 20-200 m/
5ec), and during this time it is heated by convection, then falls along the outer wall into the radiant heating chamber, where it is heated by radiation, and then blown up from the center again and heated by convection, and this process is repeated. be. In this way, in the present invention, compared to the conventional simple jet method, by providing a radiant heating chamber, convection heating and radiant heating are used together, and the overall heat transfer coefficient, which is the sum of radiation and convection, is increased. This reduces the temperature difference between the hot air temperature and the coffee beans, increases the uniformity of the coffee bean temperature, prevents coffee beans with a high temperature and coffee beans with a low temperature in some areas, and controls the roasting time. By controlling the temperature, even more precise roasting is possible. In the present invention, a flow path separating cylinder is arranged in the jet part, and the inside of the cylinder is used as an ascending passage for beans at a speed of 4 to 60 m/5ee), and the outside is separated as a descending passage. The flow of beans is ensured, the in-store display effect is increased, and less energy is required for flow. The greater the flow, the better the uniformity of the temperature of the beans.The radiant heating chamber of the present invention uses radiant heat of 100 to 300°C to heat the coffee beans, so it is roasted in the far infrared region.

This allows sufficient heat to reach the core of the coffee beans. Therefore, it is necessary to reduce the temperature difference between the surface and the core of the coffee bean, that is, to bring the temperature inside the coffee beans closer to a uniform temperature. Furthermore, the present invention has features such as being able to reliably remove the chaff (hull) using the jet stream, so that extremely high-quality roasting can be achieved without roasting (burning) the chaff (husk) together with the coffee beans. That's what I'm doing. In the present invention, objects that can be roasted include coffee beans, soybeans, sesame seeds, hailstones, Ghanaian beans, peanuts, and the like. For specific applications, this roasting machine can be used simply by changing soft aspects such as air volume, temperature, and time. In the specification relating to the present invention, these will hereinafter be collectively referred to simply as coffee beans.

Next, in the present invention, by physically separating the coffee bean flow path into an ascending path and a descending path, reliable flow can be achieved with a smaller amount of air than in the past.

Reducing the amount of air required for flow not only requires smaller equipment capacity such as blowers and heaters, but also reduces the amount of exhaust gas, which reduces heat loss in the exhaust gas and increases thermal efficiency accordingly. This also leads to a reduction in the size of the exhaust gas cooling device used when exhaust gas is discharged into building ducts, etc.

The gist of the present invention having such characteristics is as follows:
The outer wall of the roasting chamber for radiant heating is heated with hot air for convection heating of the coffee beans, etc., which is supplied to the roasting chamber, which has a discharge hole for coffee beans, etc. at the lower center end and a flow path separation cylinder in the center. rear,
A structure in which hot air is jetted into the lower end of the flow path separation cylinder located in the center of the roasting chamber from the blowout hole around the outlet hole for coffee beans, etc. at the lower end of the center of the roasting chamber, and the coffee beans, etc. are heated by convection while flowing and circulating. It has a roasting chamber, a blower and a heater that supply hot air to it, and a glass tube with a show effect is placed above the roasting chamber, and the exhaust gas is separated from chaff by a cyclone separator or filter, etc., and then discharged. This is a roasting machine for coffee beans, etc., in which roasted coffee beans are taken out into a cooler through a discharge hole at the lower center of the roasting chamber.

<Example> Hereinafter, the present invention having such characteristics will be specifically described with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing a roasting machine for coffee beans, etc. according to the present invention. This device has a blower (3) and an electric heater (2) for supplying hot air to the roasting chamber (1), a drainage hole (8) at the lower end, and a flow path separating tube (13) in the center. A roasting chamber (1), a glass tube (14) above it, a hopper (16) for charging coffee beans, etc. with a shutter (17) above it, and a chamber (16) that supports it.
15), a cyclone separator (19) or a filter (not shown) having an exhaust hole (21) for separating chaff via an exhaust passage (18),
A cooler (
22) and a control device.

To explain an actual embodiment of the roasting machine according to the present invention, first, a predetermined amount of green beans such as coffee is opened by opening the shutter (17), and then transferring it to the charging hopper (16).
) into the roasting chamber (1) and close the shutter (17). The air sent out from the blower (3) is heated to a predetermined temperature by an electric heater (2), guided through a conduit (6) to the outer mantle (4) of the roasting chamber (1), and then heated to a predetermined temperature by an electric heater (2). 1
) After heating the outer wall (5) of the roasting chamber (1), air flows through the spout hole (7) located around the discharge hole (8) at the lower end of the roasting chamber (1).
) is ejected upward toward the inside of the flow path separation tube (13) located at the center of the tube. Due to this jet flow, the green beans are heated by convection inside the flow path separation tube (13), ride on the jet flow, rise, are blown up to the upper part of the flow path separation tube (13), and are connected to the glass tube (14) and the flow path. It descends toward the roasting chamber (1) through an annular passageway (10) composed of a separation cylinder (13). (This state can be visually observed through the glass tube (14), so a show effect can be obtained at a coffee shop, etc.). Inside the roasting chamber (1), there is an annular passage (11) consisting of an outer wall (5) of the roasting chamber (1) and a flow path separation cylinder (13).
It descends, is radiantly heated, is pushed out into the flow path separation tube (13) at the lower end of the roasting chamber (1), and rises inside the flow path separation tube (13) while riding the jet again and being convectively heated. death,
By repeating this process, the beans are roasted evenly to the desired state.

The hot air used for roasting is exhausted, along with the chaff (hull) and dirt separated from the coffee beans, into the chaff receiver (20).
After being knocked down, it is discharged from the exhaust hole (21). The discharge valve (9) opens and the roasted coffee beans are discharged from the discharge hole (8) and cooled.

<Effects of the Invention> As a result of the above-mentioned constituent elements, the present invention has the advantage that in the prior art, the heating method for coffee beans was only convection heat transfer, and as in the present invention, it is possible to However, as adopted in the structure of the present invention, convection heating and radiation heating in the heating method have been pointed out due to the lack of a As a result of combining heating and forming a flow path separation cylinder inside the roaster that makes it possible, one of the essential components allows for precise processing according to the wishes of the operator, which was completely impossible with conventional technology. This invention enables the roasting of coffee beans, etc., to be controlled in a controlled manner.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a roasting machine for coffee beans, etc. according to the present invention. (1) Roasting chamber, (2) Tar, (3) Blower mantle, (5) Outer wall, pipe, (7) Nozzle hole, (9) ...Discharge valve. ... Passage, (13) ... Electric heater (4) ... (6) ... Conductor (8) ... Discharge/flow path separation cylinder, (1 4) ... Glass tube, (15)...Chamber (1
6) Loading hopper, (17) Shutter, (18) Exhaust passage, (19) Cyclo separator (20) Chaff receiver, (21)
...Exhaust hole, (22)...Cooler

Claims (1)

[Claims] 1. Convection of coffee beans, etc. supplied to a roasting chamber (1) having a discharge hole (8) for coffee beans, etc. at the lower center end and having a flow path separation cylinder (13) arranged in the center part. After heating the outer wall of the roasting chamber (1) for radiant heating with hot air for heating, the coffee beans are roasted from the spout hole (7) around the outlet hole (8) at the lower center of the roasting chamber (1). A roasting chamber (1) that blows hot air into the lower end of a flow path separation cylinder (13) located in the center of the chamber (1) to heat the coffee beans, etc. by convection while flowing and circulating them, and a blower that supplies the hot air to the roasting chamber (1). (3) and a heater (2), the roasting chamber (
1) Place a glass tube (14) such as a glass tube at the top,
Exhaust air separates and discharges chaff using a cyclone separator (19) or filter, etc., and roasted coffee beans, etc. are sent to the cooler (22) through the exhaust hole (8) at the bottom center of the roasting chamber (1). A roasting machine for coffee beans, etc., which is characterized by its ability to take out coffee beans.