JPH0775590B2 - Pressurized pouring type coffee extractor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pressurized pouring type coffee brewing device which is used for commercial use, general households, vending machines and the like, and whose brewing amount is easily controlled. Is.

2. Description of the Related Art Generally, an electromagnetic pump is used as the pressurized water injection means used in this type of device, and due to its characteristics, when the flow resistance increases, the water flow rate decreases, while the flow resistance decreases. Then, the amount of water supply will increase. For this reason, there is a problem that when the amount of the substance to be extracted is different, the flow resistance is different, so that the amount of water to be sent is different, and there has been a demand for means capable of always extracting at a constant flow rate.

A conventional pressurized pouring type coffee brewing device has a structure as shown in FIG. 5, for example.

In the figure, reference numeral 1 denotes a heater block which is a heating block. The heater block 1 is made of a good heat conductor such as aluminum, the heater block 1 is provided with a spiral water channel 2, and the back surface is spiral. Heating element 3
Is buried. Further, a through hole 4 is provided at the center thereof so as to communicate with the water channel 2. Reference numeral 5 denotes a mounting member mounted below the heater block 1, and a recess 8 having an opening 7 that is watertightly connected to the through hole 4 and the O-ring 6 is provided at the center of the mounting member 5. A valve 9 for closing the opening 7 and a valve spring 10 for urging the valve 9 are provided in the recess 8 by screwing a valve seat 11. Reference numeral 12 denotes a diffusion plate screwed to the valve seat 11 with a mounting screw 13. Reference numeral 14 is an electromagnetic pump which is a pressurized water injection means, and communicates with the suction pipe 16 having one end opened at the bottom of the water container 15 and the water passage 2 provided in the heater block 1 via this pump 14. It is connected to the connection pipe 17.

Reference numeral 18 denotes a hook plate having a central opening provided in the lower portion of the mounting bracket 5, and a filter holder which is a portion for storing an extract provided with a handle 19 around the central opening of the hook plate 18.
A plurality of notches 22 provided around the upper end of 20 for loosely fitting a plurality of claws 21 and a plurality of engagement pieces for engaging the claws 21 by the rotation of the filter holder 20 after the claws 21 are loosely fitted. 23 are provided respectively. 24 is the filter housed in the filter holder 20, 25 is the filter that is locked to the mounting bracket 5
The seal packing is in airtight contact with the upper end of 24. An outlet 26 is provided in the lower part of the filter holder 20 at the lower end of the tapered surface toward the center.

27 is a demitasse coffee cup to put this kind of coffee
A receiving plate having a large number of holes for mounting 28, and 29 is a saucer. 30 is coffee powder which is the substance to be extracted. Reference numeral 31 is an automatic temperature controller which is provided in the heater block 1 in a heat-sensitive manner and controls the energization of the heating element 3. Further, the connection pipe 17, the water channel 2, the through hole 4, the opening 7, and the recess 8 form a flow path 32.

Next, the operation of the extraction apparatus configured as described above will be described.

First, the water container 15 is filled with a required amount of water. Next, when power supply to the heating element 3 is started, the automatic temperature controller 31 controls the temperature to a predetermined temperature. Then, put a certain amount of coffee powder 30 into the filter 24 stored in the filter holder 20 and hook plate 18
Pivotally engage. This completes the preparation for coffee extraction.

Next, place the Demitas Coffee Cup 28 on the filter holder 20.
When it is set on the receiving plate 27 which is just below the outlet 26 of the pump and the pump 14 is operated, the water in the water container 15 is pumped into the heater block 1 by the pump 14 and the connecting pipe 17. Pumped. The water pumped into the heater block 1 is heated by the heat transfer from the heater block 1 into hot water while passing through the spiral water channel 2, and the hot water presses the valve 9 through the through hole 4. The coffee is passed through the inside of the coffee grounds 30 through the diffusion plate 12, and the coffee is extracted. At the same time, the coffee is discharged from the outlet 26 and poured into the demitasse coffee cup 28, whereby the coffee is completed.

When the coffee has been extracted, the handle 19 is rotated in the opposite direction to remove the claw 21 from the engaging piece 23, the coffee powder 30 in the filter holder 20 is discarded, and the filter 24 is removed. And filter holder 20 and diffuser plate 12
Etc.

Problems to be Solved by the Invention FIG. 4 shows the generated pressure (or flow path resistance) (P) and unit time of an electromagnetic pump generally used in the conventional pressurized pouring type coffee brewing device. Shows a characteristic curve diagram of water supply volume (V) per unit. When there is almost no flow path resistance, the water supply quantity is large (point A in the figure), and when the flow path resistance is a certain value, the water supply quantity decreases. (Point B in the figure), the water flow rate becomes zero due to a certain flow resistance (Point C in the figure).

From this fact, for example, the value of the flow path resistance and the amount of water supplied by the substance to be extracted are set at point B in the figure (the generated pressure is P ₀ , the water supply is V ₀ )
In this case, the flow rate resistance varies between P ₁ and P ₂ due to the difference in the amount and fineness of the extracted material such as coffee grounds, and therefore the water flow rate also varies between V ₁ and V _2. There was a problem that occurred.

In view of the above conventional problems, the present invention has an object to provide a pressurized pouring type coffee brewing device or the like capable of eliminating the variation in the flow path resistance with respect to the pressurized water injection means and always having a constant flow path resistance. And

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a flow path in which one end communicates with a pressurized water injection means and the other end is opened to an extract storage part, and this flow path A heating block having a heating element having a water channel as a part, wherein the object to be extracted storage section is a filter for extracting the object to be extracted and an extract of the object to be extracted, and the object to be extracted. The load container is equipped with a flow path resistance member having a flow path resistance larger than that of the object.

Action According to the above configuration, the flow path resistance member in the load container serves as the flow path resistance of the pressurized water injection means, and since this is a constant flow path resistance, a constant amount of flowing water is obtained, and therefore the load The substance to be extracted contained above the flow path resistance member in the container is always extracted under a constant amount of flowing water.

EXAMPLES Examples of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 and FIG. 2, 42 is a heating block, which is provided in the central portion of a heater block 43 formed of a good heat conductor such as aluminum die casting and has a substantially cylindrical shape, and has a spiral on the outer peripheral surface. It is composed of a water pipe 45 provided with a groove 44 of a shape and a heating element 46 installed in the water pipe 45.
The groove 44 of the water pipe 45 is connected to the heater block 43 and the water channel 47.
Is formed. 48 is an outlet communicating with the water channel 47, 49
Is a rotatable holder with a handle 50. A guide ring 51 is provided at the bottom of the outlet 48,
The guide ring 51 has a storage portion 53 that closely stores the capsule 52, which is a load container, and a nozzle 55 that penetrates the upper portion of the capsule 52 and opens into the capsule 52 with a nozzle hole 54 that communicates with the water channel 47. .

The capsule 52 has the following structure. 56 is a substantially conical capsule body formed by squeezing aluminum or the like, and the capsule body 56 is made of aluminum or the like, and has a bottom 57 having a downward convex spherical shape and the capsule body 56.
End portion of the capsule body 56 and a resistance plate 59 that is a flow path resistance member that is located between the bottom portion 57 and the bottom portion 57 and has a total opening area of about 0.08 mm ² by etching a stainless steel plate or the like. By bending, the rim 60 is formed by pressure-bonding in an airtight manner, and the capsule 52 is formed. 61 is coffee powder which is the substance to be extracted. The flow path resistance of the resistance plate 59 is larger than the flow path resistance of the coffee powder 61. Reference numeral 62 denotes a filter for preventing clogging provided on the resistance plate 59, and this filter 62 uses a filter paper or the like.
Reference numeral 63 is a substantially circular thin-walled portion provided substantially at the center of the bottom portion 57. Further, a space for collecting the extract is formed between the resistance plate 59 and the bottom 57 by forming the bottom 57 in a downward convex spherical shape.

Reference numeral 64 denotes a set seat having a substantially U-shaped groove in the center and integrally provided with an elevating plate 65. The substantially U-shaped groove is made of stainless steel or the like, and has a center portion. A concentric concave discharge seat 67 having a discharge port 66 is provided. The discharge seat 67 and the storage portion 53 of the guide ring 51 form an extraction target storage portion. Further, hook plates 68 that engage with the holder 49 are fixed to both sides of the groove of the set seat 64.

Reference numeral 69 denotes a rail, and this rail 69 converts the rotation of the handle 50 through a link 70 into vertical sliding of a set seat 64 equipped with a lift plate 65.

Reference numeral 71 is a water container erected at the rear of the base 72. 73 is the base
An electromagnetic pump that is provided in 72 and is connected to the bottom of the water container 71 through one of the suction ports 74, and the other is connected to the water passage 47, which is an electromagnetic pump that is a pressurized water injection means, and from the pump 73 to the water passage 47,
A flow path 75 is formed through the outlet 48 to the nozzle hole 54.
Incidentally, the pump 73 is about 200c when the flow path resistance of 9 Kgf / 1 m ^2.
c./min water supply capacity. 76 is a demitasse coffee cup used for this type of coffee.

Next, the operation of the pressurizing and pouring type coffee extracting device having the above-described structure will be described.

First, rotate the handle 50 of the holder 49 to rotate the set seat.
Drop 64. Next, as in the conventional case, a required amount of water is put in the water container 71, and the power supply to the heating element 46 is started. After a predetermined time elapses, the heating block 42 starts to be temperature-controlled by an automatic temperature controller (not shown). Here, the capsule 52 is placed in the guide groove of the set seat 64.

Next, by rotating the handle 50, the capsule 52 placed on the set seat 64 is housed in the housing portion 53 of the guide ring 51 having substantially the same shape as the capsule 52, and is hermetically held together with the discharge seat 67. It At this time, the nozzle hole 54 is opened in the capsule 52.

Next, the demitasse coffee cup 76 is placed on the discharge port 66 of the discharge seat 67.
Installed below the pump, and when the pump 73 starts operating, the water container
The water in 71 is pumped to the spiral water passage 47 by the pump 73 through the suction port 74, heated by the heating element 46 to be hot water, and flows out from the outlet 48.

The hot water heated in the heating block 42 is discharged into the capsule 52 from the nozzle hole 54 of the nozzle 55 by the pressure of the pump 73. The hot water reaching the capsule 52 is dipped in the coffee powder 61 to extract the coffee. The coffee powder 61 is filtered by the filter 62, and only the coffee has a total opening area of the resistance plate 59 of about 0.08 mm ²
Through the opening 58.

Next, the coffee that has passed through the resistance plate 59 is at the bottom of the capsule 52.
The thin portion 63 of the bottom portion 57 is inflated and ruptured by the pressure of the pump 73, and the coffee flows out from the discharge port 66 of the discharge seat 67 and is poured into the demitasse coffee cup 76.

After that, the load of the pump 73 is the opening 58 of the resistance plate 59 and always maintains the flow path resistance of about 9 kgf / cm ² . When an appropriate amount of coffee is extracted in the demitasse coffee cup 76, the operation of the pump 73 is stopped to complete the coffee extraction.

Next, when the handle 50 is rotated to lower the setting seat 64, the capsule 52 is removed from the guide ring 51.

Thus, according to this embodiment, the coffee powder is packed in the capsule 52.
61 and a resistance plate 59 having an opening 58 which has a flow path resistance larger than that of the coffee powder 61 below the pump 61.
Since the load of 73 is the resistance plate 59, the flow resistance is always constant, and therefore the amount of water sent by the pump 73 is also constant.
Coffee can always be extracted under the conditions of constant pressure and constant water supply.

FIG. 3 shows another embodiment of the present invention, in which 100 is a load container and 101 is the load container.
It is an opening that constitutes a flow path resistance member formed by laser processing or the like at the bottom of 100. 102 is a coffee ground that is the substance to be extracted, 103 is a filter holder that is formed of a zinc alloy or the like and constitutes a portion for containing the substance to be extracted, and 104 is an outlet provided at the center bottom of the filter holder 103. 1
05 is a filter for preventing clogging using filter paper or the like.

The filter holder 103 is set in the above-mentioned conventional extraction device for pressurized pouring type coffee or the like, and when coffee is extracted in the same manner as in the conventional example, the opening 101 of the load container 100 serves as a flow path resistance, As a result, the pump 14 always has a constant flow resistance, so that the amount of water supplied becomes constant. Therefore, there is an effect that the coffee powder 102 is always extracted with a constant water supply amount. The other operations are the same as in the conventional example.

In the above example, coffee powder was used as the substance to be extracted, but it may be instant coffee or powder soup, and in this case, the water supply amount of the pressure extraction means is always controlled by the flow path resistance member. , It does not make a difference in its action and effect. Further, in the above-described embodiment, the electromagnetic pump is used as the pressurized water injection means, but it may be directly connected to the water pipe depending on the pressure used, and the point is that the required water pressure is obtained.

EFFECTS OF THE INVENTION As described above, according to the present invention, the flow path having one end communicating with the pressurized water injection means and the other end opening to the substance-to-be-extracted storage portion and the water path which is a part of this flow path are provided. And a heating block provided with a heating element, wherein the object-to-be-extracted storage section is a filter for the object to be extracted and an extract of the object to be extracted, and has a greater flow resistance than the object to be extracted. Since the load container having the flow path resistance member is provided, the flow path resistance member serves as the load resistance of the pressurized water injection means, whereby the amount of water to be pumped is constant and the extraction of the substance to be extracted is always a constant flow rate. Therefore, the extraction can always be performed under constant conditions.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of a pressurized pouring type coffee brewing apparatus showing an embodiment of the present invention, FIG. 2 is a partial sectional view of the same, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a partial sectional view of the brewing device, FIG. 4 is a characteristic diagram of an electromagnetic pump used for pressurized water injection means, and FIG. 5 is a sectional view of a conventional pressurized brewing type coffee brewing device. 42 ... Heating block, 45 ... Waterway, 46 ... Heating element, 52 ...
… Capsule, 53… Storage part, 59… Resistor plate, 61… Coffee powder, 67… Discharge seat, 73… Pump, 75… Flow path.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Shown in Sho 60-57885 (JP, U) Shown in Sho 52-21980 (JP, U)

Claims (1)

[Claims] 1. A heating device provided with a heating element having one end communicating with a pressurized water injection means and the other end having an opening in an object storage portion and a water passage which is a part of this passage. A load comprising a block, the extractable substance storage section, and a flow path resistance member that is a filter for an extract of the extractable substance and has a flow path resistance larger than that of the extractable substance. Pressurized pouring type coffee extractor equipped with a container.