JPS6159125B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a grinder for beans such as coffee beans,
This invention relates to a device that releases the powder particles of beans that have been crushed with a cutter.

Conventional grinding of this type of coffee beans is generally done by rotating a blade cutter installed in a grinding chamber to grind the coffee beans. The powder is sorted by a filter installed in the grinding chamber and released through the suction air generated by the fan, so that the roughness of the powder particles is approximately constant, and the aroma and odor are removed by heating etc.
BACKGROUND OF THE INVENTION Machines have been developed to grind coffee beans and other legumes that can be processed quickly and without the risk of altering the taste. In such a pulse crusher, it is conceivable that the air flow that guides the powder particles to the storage portion be returned to the crushing chamber so that the beans are smoothly supplied to the crushing chamber.

The present invention has been made in view of the above points, and makes it possible to return the air flow that led the powder grains to the storage part to the grinding chamber, adjust the amount of air in this returned air flow, and make it possible to adjust the residence time of pulses in the grinding chamber. To provide a pulse pulverizer that can adjust the particle size by adjusting the pulverizer.

Next, the configuration of an embodiment of the present invention will be explained with reference to the drawings.

A base 1 has an electric motor 2 built therein, and a drive shaft 3 of the electric motor 2 protrudes from the top surface of the base 1. A ventilation chamber 4 in which a protruding portion of the drive shaft 3 is located and a duct portion 5 communicating with the ventilation chamber 4 are formed on the upper surface of the base 1.

Further, a mounting part 9 for a storage case 8 forming a storage part 7 is integrally provided at the lower part of one side of the base 1.

An introduction opening 10 is formed in the upper part of one side of the storage case 8 and communicates with the duct section 5 when the storage case 8 is placed on the mounting section 9. An opening 11 is formed. A lid 12 is also provided to open and close the upper opening of the storage case 8.

Further, on the inner surface of this lid body 12, there is a guide plate 13 that separates the introduction opening 10 and the discharge opening 11 from the introduction opening 10.
It is formed substantially parallel to the direction of air flow from the duct portion 5 communicating with the air flow.

Further, 14 is a fan, and a ventilation chamber 4 is attached to the drive shaft 3.
It is installed facing the

Next, 15 is a case body in which a crushing chamber 16 is formed, a base case member 17 and a crushing part case member 1.
The base case member 17 and the crusher case member 18 are removably connected by a clamp.

The ventilation chamber 4 and the duct portion 5 are formed by the bottom opening surface of the base case member 17 placed on the top surface of the base 1, the base 1, and the top surface, and the base case member 17 is placed on the top surface of the base 1. 1 with a screw (not shown). Further, a filter receiving portion 19 is formed in a step-like notch on the inner periphery of the upper surface opening in the base case member 17.

Furthermore, the crushing chamber 16 of this crushing part case member 18
A lower opening edge of the base case member 17 is fitted into the filter receiving portion 19 of the base case member 17.

Further, the base case member 17 has a discharge opening 11.
A circulation flow duct portion 20 is formed which communicates with
is formed outside the crushing chamber 16 formed in the upper part of the crushing part case member 18. The upper end of this reflux passage 21 is communicated with the hopper chamber 23 through a reflux port 22 formed at the upper end side of the hopper chamber 23 formed above the grinding chamber 16 .
The lower part of this hopper chamber 23 is communicated with the grinding chamber 16 through an opening 24.

Next, reference numeral 25 denotes a filter, which is formed in the shape of a mesh mesh that allows powder particles of a predetermined particle size to pass through. The pulverizing unit case member 18
It is adapted to be clamped at the lower opening edge of the crushing chamber 16.

Reference numeral 26 denotes a blade cutter, which is formed with a blade section deviated by 180 degrees, and is detachably attached to the tip of the drive shaft 3 close to above the filter 25.

A plurality of blade pieces protrudes from the upper surface of the fan 14, and the fan 14 is disposed so as to face the lower end opening of the crushing chamber 16.
The duct portion 5 is located at a tangent to the rotational direction of 4.
is coming.

Reference numeral 27 designates a lid body that freely opens and closes the upper openings of the hopper chamber 23 and the reflux passage 21 of the case body 15, and is molded from synthetic resin and is attached to the upper opening edge of the hopper chamber 23 of the crushing unit case member 18. The annular edges to be fitted are molded and are removably connected using a clamp (not shown). This lid body 2
7 has a guide slot 29 formed concentrically with the lid 27 for guiding a regulating protrusion 28 protruding from the upper part of the crusher case member 18.

Further, an arc-shaped adjustment part 30 is vertically integrally formed on the inner surface of the lid 27 to face the reflux port 22 and integrally protrude. The reflux port 22 is opened and closed to adjust the amount of air.

Further, the reflux port 22 is formed at a height such that beans cannot enter, and the cross-sectional area of the powder introduction opening 10 of the storage portion 7 is formed to be smaller than the maximum opening area of the reflux port 22.

Next, the operation of this embodiment will be explained.

When grinding beans, for example coffee beans, the coffee beans are put into the grinding chamber 16 of the case body 15, and the lid body 2
When the electric motor 2 is driven with the upper surface of the case body 15 closed at 7, the cutter 26 and the fan 14 are driven.
The cutter 26 rotates, and the coffee beans supplied from the hopper chamber 23 are crushed by the rotation of the cutter 26. At this time, by driving the fan 14, the crushing chamber 16, the ventilation chamber 4, the duct part 5, the introduction opening 10, the storage case 8, the discharge opening 11, the circulating flow duct part 20, the reflux path 21, the reflux port 22, the hopper chamber 23, Grinding chamber 16
An air flow is generated in the air flow path 31 of the cutter 26, and the coffee beans having a predetermined particle size or less are crushed by the cutter 26 and are passed through the filter 25 located at the bottom of the cutter 26 by this air flow and the centrifugal force of the cutter 26. The beans in the hopper chamber 23 are smoothly supplied to the crushing chamber 16 by the air flow, and are sent from the crushing chamber 16 to the ventilation chamber 4.
It is sent from the duct part 5 to the storage part 7 of the storage case 8. This air flow also cools the coffee beans or ground powder.

Then, when the lid body 27 is rotated by the engagement guide between the regulating protrusion 28 and the elongated hole 29, the opening area of the reflux port 22 is adjusted. When this reflux port 22 is fully opened, the grinding chamber 1
There is almost no pressure difference between fan 1 and reservoir 7.
The air flow generated by 4 circulates without resistance,
The powder particles sorted by the filter 25 and sucked by the fan 14 are quickly introduced into the storage section 7.

Furthermore, when the lid body 27 is rotated to narrow the opening area of the reflux port 22, the pressure inside the reservoir 7 increases, and the fan 1
4 is reduced, the time the powder particles remain in the grinding chamber 16 becomes longer, the particle size is higher, and the grinding becomes finer.

Note that the air amount adjustment section 30 is the circulating flow duct section 2.
0. It can also be configured with a valve provided in the reflux path 21 or the discharge opening 11.

Further, the fan 14 is not limited to a centrifugal fan, and any suitable fan may be used.

According to the present invention, since the adjustment part is formed in the grinding chamber to adjust the flow of air that is refluxed from the reflux port via the storage part, by adjusting the air volume in the adjustment part, air is sucked from the grinding chamber into the storage part. The residence time of the powder particles in the crushing chamber can be adjusted, and the degree of crushing can be adjusted. Furthermore, since the cross-sectional area of the particle introduction opening of the storage section is made smaller than the maximum opening area of the adjustment section, the pressure inside the storage section will not become higher than the pressure of the crushing chamber, so the suction force by the fan will not decrease. The powder particles crushed by the cutter to a predetermined particle size or less are immediately discharged into the storage part, and the particle size of coffee beans etc. becomes uniform, and there is no risk of heat generation due to friction etc. from the powder particles crushed by the cutter, and the fragrance and aroma are eliminated. There is no risk of changes in quality that would impair taste.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a pulse crusher showing an embodiment of the present invention with the lid removed, and FIG.
3 is a sectional view of the lined part in FIG. 1, FIG. 4 is a sectional view of the lined part in FIG.
The figure is an enlarged perspective view of the adjustment section same as above. 7...Storage part, 10...Powder introduction opening, 14...
...Fan, 16...Crushing chamber, 21...Recirculation path, 2
5...Filter, 26...Cutter, 30...Adjustment section.

Claims (1)

[Scope of Claims] 1. A grinding chamber in which a rotary cutter is disposed and a filter is provided at the opening, and a storage section that communicates with the opening of the grinding chamber and stores the powder particles that have passed through the filter;
The airflow is made up of a fan that generates wind to transfer the powder particles that have passed through the filter from the grinding chamber to a storage section, and a reflux path that communicates from the storage section to the grinding chamber, and is circulated from the reflux path. A pulse crusher characterized by forming an adjustment part in the passageway to adjust the amount of air. 2. The pulse crusher according to claim 1, characterized in that the cross-sectional area of the powder introduction opening of the storage section is smaller than the maximum opening area of the air flow path adjustment section.