JPH0251328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for extracting coffee, etc., which obtains an extract liquid by injecting hot water under pressure into a material to be extracted, such as coffee powder.

Structure of conventional example and its problems Generally, it is preferable to extract coffee at high temperature for a short time and evenly from the entire coffee. For this reason, coffee brewing devices that pressurize with a pump or the like to extract coffee in a short period of time have conventionally been used.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A conventional coffee extraction device as described above will be described below with reference to the drawings.

FIG. 1 shows a conventional extraction device for coffee, etc. In FIG. 1, 1 is a heater block, the block body 2, an upper cover 3,
The lower cover 4 is made of a good thermal conductor such as aluminum. The block main body 2 has a spiral water channel groove 5 on its front surface, and a spiral heating element 6 embedded in its back surface. Further, a through hole 7 is provided in the center thereof in communication with the water channel groove 5. Reference numeral 8 denotes a seal ring provided on the outer periphery of the block body 2, and an upper cover 3 is provided in a watertight manner to close the upper surface of the groove 5 to form a water channel 5a. The lower cover 4 is provided with a recess 10 having an opening 10a that communicates with the through hole 7 in a watertight manner through an O-ring 9, and a valve 11 for closing the opening 10a and a valve 11 attached thereto. A valve spring 12 is provided by screwing onto a valve seat 13. 14 is a diffusion plate screwed onto the valve seat 13 with mounting screws 15.

16 is an electromagnetic pump;
A suction pipe 18, one of which is open at the bottom of the water container 17, is connected to a connecting pipe 19 which communicates with the water channel 5a of the heater block 1 formed by the groove 5 of the block body 2. 19a is an on-off valve provided between the connecting pipe 19 and the water channel 5a, and the pump 16 is operated in conjunction with the operation of the pump 16.
When the pump 16 is in operation, the drain pipe 19b is closed and the connecting pipe 19 communicates with the water channel 5a, and when the pump 16 is stopped, the drain pipe 19b and the connecting pipe 19 are communicated with each other.

Reference numeral 20 denotes a hook plate with a central opening provided at the lower part of the lower cover 4, and around the central opening of the hook plate 20, a plurality of claws are provided around the upper end of the filter holder 22 equipped with a handle 21. 2
3 is loosely fitted into the plurality of notches 24, and the claw 23 is formed by rotating the filter holder 22 after the claw 23 is loosely fitted.
A plurality of engaging pieces 25 are respectively provided to engage with. 26 is a filter housed in the filter holder 22, and 27 is a seal packing that is engaged with the lower cover 4 and comes into airtight contact with the upper end of the filter 26. In addition, in the lower part of the filter holder 22, an outlet 28 is provided at the lower end of the tapered surface toward the center.

Reference numeral 29 is a receiving plate provided with a number of holes on which demitasse coffee cups 30 for storing this type of coffee are placed, and 31 is a receiving plate. Further, 32 is an automatic temperature controller thermally attached to the block body 2. 33 is coffee powder stored in the filter 26.

The operation of the extraction device configured as described above will be described below.

First, fill the water container 17 with the required amount of water. Next, when electricity is started to be applied to the heating element 6, the automatic temperature controller 32
The temperature is controlled to a predetermined temperature. Then, a predetermined amount of coffee powder 33 is put into the filter 26 housed in the filter holder 22, and the filter 26 is brought into rotational engagement with the hook plate 20. The preparation for coffee extraction is now complete.

Next, set the demitasse coffee cup 30 on the receiving plate 29, which is located almost directly below the outlet 28 of the filter holder 22, and at the same time operate the operation switch (not shown) of the pump 16, and at the same time, connect the connecting pipe 19 with the drain using the on-off valve 19a. A circuit is closed between the pipes 19b, and the water in the water container 17 is pumped through the suction pipe 18 and the connecting pipe 19 to the block body 2 by the pump 16.
to be pumped inside. The water pumped into the block main body 2 is boiled by heat transfer from the heater block 1 while passing through the spiral water channel 5a and becomes hot water, passes through the through hole 7 and presses the valve 11.
It passes through the coffee grounds 33 via the diffusion plate 14 and extracts the coffee liquid, which flows out from the outlet 28 and is poured into the demitasse coffee cup 30. When an appropriate amount of coffee has been extracted into the demitasse coffee cup 30, the operation switch (not shown) of the pump 16 is operated to stop the pump 16, and at the same time the on-off valve 19a is operated to open the space between the water channel 5a and the drain pipe 19b. The water pressure remaining in the water channel 5a is removed by opening the channel, and the pressure in the water channel 5a is reduced.

However, in the above configuration, in order to effectively boil water, the water channel 5a needs to have a small cross-sectional area and be long. on the other hand,
As water is forcibly pumped into the water channel 5a by the pump 16 as described above, safety problems arise if the water channel 5a is blocked by water stains or the like.

OBJECTS OF THE INVENTION In view of the above-mentioned conventional drawbacks, an object of the present invention is to provide a safe and economical extraction device for coffee, etc.

Structure of the Invention In order to achieve the above object, the coffee extraction device of the present invention includes a flow path in which hot water is poured from a pressurized water injection device at one end to a material to be extracted such as coffee powder at the other end.
A heater block body having a substantially cylindrical elongated hole, a substantially cylindrical heater inside, a continuous spiral groove from one end to the other end of its outer peripheral surface, and seal rings provided at both ends of the A water heating unit consisting of a substantially cylindrical water pipe inserted into a long hole to airtightly form a waterway forming a part of the flow path is provided, and a water heater is provided on the outer wall of the heater block body near the entrance of the long hole. an inlet located near the back of the elongated hole and communicating with the other end of the water channel; and an outlet opposite the inlet; The outlet is equipped with a control valve that keeps the water channel open at all times for drainage, and maintains the pressure within the channel below a certain level when brewing coffee, etc.
According to this configuration, when the control valve is opened, the water being pumped out is drained without being heated, and only the water used to brew coffee, etc. is heated, making it possible to boil water efficiently. It is.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 2 to 8 show an apparatus for extracting coffee, etc. according to an embodiment of the present invention. In FIGS. 2, 3, 4, and 5, 41 is a water heating unit; The water heating unit 41 includes a substantially cylindrical heater 44 in which a heating wire 42 is filled with insulating powder 43, a substantially cylindrical heater 44 having a continuous spiral groove 45 on its outer periphery from one end to the other, and seal rings at both ends. 46, and furthermore, a water pipe 47 which is made of a good thermal conductor such as a copper alloy with the heater 44 internally arranged in a good thermal conductive manner, and a water pipe 47 which is formed into a substantially rectangular parallelepiped with a good thermal conductive material such as aluminum die-casting and has a longitudinal direction in the center thereof and a heater block main body 48 having a substantially cylindrical elongated hole 48a, and a water tube 47 with seal rings 46 attached to both ends is accommodated in the elongated hole 48a of the heater block main body 48.
The inner wall 48b of the elongated hole 48a and the groove 45 of the water pipe 47
A spiral water channel 49 is formed in an airtight manner. 5
0 is an inlet located at the entrance of the water channel 49 and provided on one surface of the heater block body 48.
51 is a check valve screwed onto the inlet 50; 52
53 is a water injection pipe connected to the check valve 51;
is an outlet provided at the bottom of the heater block main body 48 located at the tip of the water channel 49. Reference numeral 54 denotes a discharge port which is branched in the middle of the water channel 49 and is provided facing the opposite side of the inlet port 50 of the heater block main body 48 and communicated linearly with the inlet port 50 via the water channel 49. A substantially T-shaped control valve 55 is screwed to the discharge port 54. The control valve 55 is hollow and substantially T-shaped, and has a storage hole 56a at one end screwed into the block body 48, and a sliding hole 56a at the opposite end connected to the storage hole 56a. A control valve outer shell 57 has a hole 56b and a drain port 56 communicating with the storage hole 56a at the remaining end, and a valve body spring 59 is attached to a mortar-shaped valve receiving portion 58 provided at the tip of the storage hole 56a. A substantially conical valve body 60 is pressed and sealed by bringing one end into contact with the valve body, and a concave receiving portion 61 for receiving the other end of the valve body spring 59 is provided at the tip of the sliding hole 56b.
A pressing body 64 is provided with a stepped portion 63 at the rear thereof and a first adjusting female threaded portion 62 extending thinly, and the first adjusting female threaded portion 62 of this pressing body 64 has a substantially spherical surface at the tip and is screwed. and the pressing body 6
4 back and forth to press the valve body 60 via the valve body spring 59. A second adjusting female threaded portion 66 is provided, and a second adjusting female screw portion 66 is screwed onto the second adjusting female threaded portion 66, and the front and rear positions of the pressing body 64 can be adjusted by pressing the stepped portion 63 of the pressing body 64. A second adjustment body 67 is provided.

68 is a first nut for fixing the first adjusting body 65 after adjustment, and 69 is a second nut for fixing the second adjusting body 67 after adjustment. 7
Reference numeral 0 denotes an O-ring that is equipped on the pressing body 64 and allows the pressing body 64 to slide freely in an airtight manner within the sliding hole 56b. Reference numeral 71 has one end brought into contact with the pressing body 64 integrated with the first regulating body 65 via the first nut 68, and the other end of the regulating body integrated with the control valve outer shell 57. 64 to urge the pressing body 64 backward. Further, a drain pipe 72 is connected to the drain port 56.

73 is a terminal plate of the heater 45, 74 is a set screw for screwing the water tube 47 onto the heater block body 48, and 75 is an automatic temperature regulator provided thermally in the heater block body 48; The temperature of the water heating unit 41 is adjusted by controlling the power supply to the heater 44.

In FIGS. 2, 6, and 7, 76 is a ring plate having an opening 78 in the center that communicates airtightly with the outlet 54 through an O-ring 77. It is screwed onto the lower surface of the block body 48 by a screw 79. Reference numeral 80 denotes a holder that is integrally formed of zinc die-casting or the like, and has a substantially cylindrical shape with the ring plate 76 inside and a handle 81 for operation extending outward from the holder. The ring plate 76 is engaged with the upper outer circumferential step 82 of the ring plate 76 so as to be rotatable.

83 communicates with the opening 78 and is connected to the ring plate 7.
The guide ring is removably provided by a male threaded part 86 that is screwed into a female threaded part 85 of a stepped hole part 84 provided in 6.The guide ring 83 has a needle tip with an acute angle tapered tip in the upper center of the guide ring 83. A nozzle 87 made of stainless steel or the like is press-fitted therein, and a housing section 88 is provided surrounding the nozzle 87 to form a substantially truncated conical cavity.
3 is made of stainless steel or the like.

The nozzle 87 has a nozzle hole 8 which is branched into two directions at the lower end and opened in the tapered surface.
9, and a guide ring 83 is provided with an O-ring 90.
When screwed on, the ring plate 76 is in airtight communication with the opening 78 of the ring plate 76.

Reference numeral 91 denotes a valve formed of silicone rubber or the like and provided in the stepped portion of the stepped hole portion 84, and this valve 91 is connected to the opening 78 by a valve spring 93 provided in the central opening 92 of the male threaded portion 86 of the guide ring 83. is biased in the direction of closing.

Reference numeral 94 denotes a support fitting provided on the base 95 by screwing it with a screw, etc. The support fitting 94 is formed of a steel plate or the like in a substantially U-shape that is open to the rear, and has a support fitting 94 provided at both ends on the front side. An elevating plate 97 made of a stainless steel plate or the like can be raised and lowered via a support rod 96.
It is equipped with The elevating plate 97 is provided with a notch hole 98 at its center, and this notch hole 9
A capsule stand 101 formed of aluminum die-casting or the like is provided with a guide groove 100 having a substantially U-shaped cross section and opening at an inclined surface 99 descending to 8. Furthermore, a pair of left and right hook plates 102 are formed on the top surface of the capsule base 101 by zinc die casting or the like, with a gap narrower than the U-shaped groove width of the guide groove 100. Further, at the lower center of the capsule base 101, there is provided a disk-shaped capsule seat 104 made of stainless steel or the like, which has a discharge port 103 in the center and has a concave periphery.

The pair of hook plates 102 are integrally provided with hook pieces 105 that protrude outward from each other, and the hook pieces 105 slide upward together with the elevating plate 97 to almost reach the upper end of the sliding range of the elevating plate 97. When it reaches this point, it passes through a notch 106 provided around the central opening of the holder 80 and engages with an engaging part 107 adjacent to the notch 106 by rotation of the holder 80 .

In FIGS. 2, 3 and 7, 108
2 is a lever formed of a steel plate or the like and provided slidably in the front-rear direction, that is, in the longitudinal direction of the heater block main body 48, on the side of the mounting bracket 109 shown in FIG. 108 engages near the base of the handle 81 of the holder 80 and slides in conjunction with the rotation of the holder 80. 110 is integrally fixed to the lever 108 and is connected to the first adjusting body 6 of the control valve 55.
The control valve 55 is operated by converting the operation of the handle 81 into the sliding movement of the pressing body 64 via the rail 110, which is made of synthetic resin or the like and has an inclined portion 111 that abuts the control valve 55. In addition, in the reset state where the handle 81 is pulled forward (the state shown by the solid line in FIG. 3), the inclined portion 111 of the rail 110 does not come into contact with the first adjusting body 65, and the pressing body 64 is pressed against the return spring 71. Since the valve body 60 is biased toward the rear rail 110 side and the valve body spring 59 of the valve body 60 is no longer biased, the control valve 55 opens the water channel 49 to the drain pipe 72 communicating with the drain port 56 .

Reference numeral 112 is made of a steel plate or the like, and is connected to the lever 1.
This link 112 is pivotally supported by a shaft 114 on one side of the support metal fitting 94, and the other end is connected to the engagement provided on the side wall of the elevating plate 97. Joint axis 115
The lifting plate 97 engages with the lifting plate 97 to control the rotation of the holder 80.
The capsule table 101 moves in conjunction with the vertical sliding motion of the capsule table 101. 116 is a contact piece that forms the recess 113 of the lever 108, and this contact piece 11
6 is the end portion 1 of the link 112 while the lifting plate 97 slides almost to the upper end and the hook piece 105 engages with the engaging portion 107 due to the rotation of the holder 80 as described above.
17 to keep the capsule stand 101 at approximately the upper end position. The contact piece 116 is provided with a first square hole 118 and a second square hole 119, and the end portion 117 is provided with a protrusion 120 and a step protrusion 121 opposite thereto. Further, 122 is a protruding piece that is provided adjacent to the abutting piece 116 and protrudes from the lever 108, and 123 is a protruding piece provided on the link 112.
It is an engagement piece provided on the top of the capsule base 1.
When the capsule stand 101 is lowered, it engages with the protruding piece 122 and forcibly lowers the capsule stand 101.

In FIGS. 2 and 8, 124 is a water container provided at the rear of the water heating unit 41;
The adjacent side wall 124a of the capsule platform 101 that moves up and down is provided with a pair of guide ribs 124b that extend downward and surround the notch hole 98 of the up and down plate 97 that is connected to the guide groove 100. The suction pipe 126 of the electromagnetic pump 125, which is a pressurized water injection device provided on the base 95, and the communication bushing 12
7 and a valve 129 provided on one side of the support fitting 94, the pump 1 is
Front pull-out type saucer 130 provided in front of 25
A second opening 132 is provided that communicates with a drain hole 131 that opens inward.

The pump 125 has a suction pipe 126 for sucking water communicated with the water container 124 via a communication bushing 127 as described above, and the other discharge pipe (not shown) is connected to the check valve 51 via the pipe 52. An inlet 50 provided in the water heating unit, a water channel 49,
It communicates with the outlet 53 , the opening 78 of the ring plate 76 , the stepped hole 84 , the central opening 92 of the guide ring 83 , the nozzle hole 89 of the nozzle 87 , and the outlet 54 branched from the water channel 49 . Further, high water pressure is applied to the flow path 132a including the discharge pipe (not shown) to the nozzle hole 89 and the high pressure generating section (not shown) of the pump 125.

Note that the drain pipe 72 is open above the saucer 130. Further, the drain hole 131 communicating with the second opening 132 is normally closed by a valve 129.

133 is a float switch provided at the bottom of the water container 124, and detects the water level of the water stored in the water container 124. Further, 134 is a Tetron filter provided in the first opening 128. 13
5 is a side plate, and this side plate 135 houses the saucer 130 and the pump 125 together with a back plate 137 having rubber legs 136 and the base 95. 13
8 is an operation knob of the valve 129, 139 is a lid of the water container 124, 140 is a receiving plate located below the capsule stand 101 and provided at the opening of the base 95,
This receiving plate 138 is connected to the outlet 10 of the capsule stand 101.
It has a large number of holes 140a through which coffee dripped from the tray 130 passes, and a demitasse coffee cup 141 is placed thereon. 142 is a heat shield plate of the water heating unit 41, 143 is its cover, and 144 is an operation switch provided on the operation panel 145.

In FIG. 6, reference numeral 146 denotes a capsule in which coffee powder 147 is sealed. A bottom part 150 is formed of a thin film such as aluminum and has a line of weakness 149 that expands and opens when pressure is applied. The capsule body 148 is further extended to form an outer rim 152, which is then crimped and seamed.

The operation of the coffee extraction apparatus configured as described above will be described below.

First, the handle 81 of the holder 80 is rotated in the forward direction (in the direction opposite to the water container 124) to lower the capsule stand 101 and open the water channel 49 to the drain pipe 72.

Next, the required amount of water is poured into the water container 124, and the operation switch 144 is operated to start supplying electricity to the heater 44. Although the temperature of the water heating unit 41 rises with the passage of time, the water vapor pressure in the water channel 49 does not rise, and the pressure remains in the drain pipe 7.
Run away from 2. After a predetermined period of time has elapsed, the water heating unit 41 begins to be controlled to a predetermined temperature by the automatic temperature controller 75.

Here, the capsule 146 is inserted into the guide groove 100 of the capsule stand 101. Capsule seat 104 where capsule 146 is located directly below guide ring 83
When fully inserted, the capsule 146 is positioned by engaging the convex spherical bottom 150 with the concave capsule seat 104.

Next, turn the handle 81 backwards (towards the water container 124)
The capsule base 101 is raised via the lever 108, the link 112, and the lifting plate 97, and the press body 64 is raised via the first adjusting body 65 of the control valve 55 by the rail 110 provided on the lever 108. is pressed against the valve body spring 59 to bias the valve body 60 against the valve receiving portion 58. On the other hand, the capsule 146 placed on the capsule stand 101 is attached to a guide ring 83 which has approximately the same shape as the capsule body 148.
The needle-shaped nozzle 87
The tip of the capsule 146 is pierced, and a nozzle hole 89 is opened in the capsule 146.

As the handle 81 continues to rotate, the concave portion 113 of the lever 108 moves into the protrusion 1 of the end portion 117 of the link 112.
20, the capsule platform 101 reaches almost the upper end of the lifting range in which it slides together with the lifting plate 97, and even if the handle 81 is rotated, the lever 1
08 only slides into contact with the terminal portion 117 with the contact piece 116, and the link 112 does not rotate, so the capsule stand 101 does not rise. At this time, capsule stand 1
The hook piece 105 provided on the holder 80 enters through the notch 106 of the holder 80. Handle 81
When the holder 80 is further rotated through the
The capsule stand 101 rotates while abutting on the inclined surfaces provided on the inner surfaces of the capsule stand 101, respectively, and the capsule stand 101 is further lifted up. The setting of the capsule 146 is completed when the capsule stand 101 is lifted and the outer rim 152 of the capsule 146 in contact with the capsule seat 104 is pressed against the lower end of the guide ring 83 from above to hold the capsule 146 airtight. On the other hand, in the lever 108 and the link 112, the handle 81
In conjunction with the rotation of the lever 108, the lever 108 further slides rearward. At this time, the protrusion 120 provided on the end portion 117 of the link 112 is connected to the contact piece 11 of the lever 108.
6 and engages with the second square hole 119, and the end portion 117
The step protrusion 121 of the capsule 146 engages with the first square hole 118, and each time the end face of the first square hole 118 passes over each step of the step protrusion 120, a sound is generated and the capsule seat 104 of the capsule 146 is and represents the state of holding by the guide ring 83.

Next, the demitasse coffee cup 141 is placed on the receiving plate 140 below the outlet 103 of the capsule seat 104, and when the operation switch 144 is operated to start the operation of the pump 125, the water in the water container 124 is pumped out. 125, and is then forced into the water pipe 47 via a pipe 52 that communicates with a check valve 51 provided at an inlet 50 of the heater block body 48 from the discharge pipe (not shown) of the pump 125. The water sent to the water pipe 47 circulates near the outer periphery of the heater 44 through a spiral waterway 49, is boiled, becomes hot water, and flows out from the outlet 53. Furthermore, this hot water is pumped to pump 12.
The valve 91 is pressed by the discharge pressure from the nozzle 8.
The coffee powder 147 in the capsule 146 is sprayed from the nozzle hole 89 of No. 7. and capsule 1
The hot water pumped into 46 passes through coffee powder 147, is filtered by filter 151, and is discharged from outlet 103.
The coffee is poured into the demitasse coffee cup 141 to prepare coffee.

Now, the pressure required to extract coffee is approximately 9Kg/cm ²
The flow rate is approximately 200 c.c. per minute. Therefore, the performance of the electromagnetic pump 125 alone is approximately 200c.c./min (points) at a load of approximately 9Kg/ ^cm2 , as shown by the solid line in Figure 9.
If the flow rate is adjusted to obtain a flow rate of , the maximum pressure (when the flow rate is 0 c.c. per minute) is usually about 20 Kg/cm ² .
However, the flow path from pump 125 to nozzle 87 and capsule 146, especially its filter 15
1 to withstand a pressure of about 20 kg/cm ² is difficult. Therefore, the pressure control by the control valve 55 takes into account the deformation of the filter 151, and the maximum pressure is about 15
Kg/cm ² and taking pressure variations into consideration, the operating range of the control valve 55 is approximately 11 Kg/cm ² to approximately 14 Kg/cm ²
is good. Therefore ^, in the control valve 55, the valve body 60 starts moving at about 11 kg/cm ² as shown by the broken line in FIG. The load characteristics of the valve body spring 59 and the position of the pressing body 64 are set as the amount of movement of the valve body 60 that creates a gap.

Therefore, as a matter of course, from waterway 49 to capsule 14
If there is some kind of trouble in the flow path between 6 and 6 and the pressure in that flow path increases, the flow rate in the flow path will decrease as the pressure increases, as shown by the broken line in FIG. increases, and at about 14 kg/cm ² all of the flow flows out to the saucer 130 via the drain pipe 72, and the pressure no longer increases.

Furthermore, when the extraction of coffee is finished, the hot water stagnant in the water channel 49 is heated by the heater 44 and expands, flows out from the nozzle hole 89 and reaches the receiving plate 140.
The droplets will be dripped upward, but by rotating the handle 81 toward you, the capsule stand 10 will be dripped as described above.
1 is lowered and the water channel 49 is opened to the drain pipe 72. Since the valve spring 93 closes the valve 91 in the flow channel on the nozzle 87 side to the extent that it does not interfere with coffee extraction, the outlet of the control valve 55 is opened. 5
4 flows out to the receiving plate 130 via the drain pipe 72, and no longer drips onto the receiving plate 140.

As described above, according to this embodiment, the capsule stand 1
Since the control valve 55 is provided in conjunction with the handle 81 that slides the capsule 101 and holds the capsule 146, the middle of the water channel 49 can be opened when the capsule platform 101 is lowered, and the capsule platform 10
1, even if the flow path 132a from the water channel 49 to the capsule 146 is disturbed in some way and the pressure rises, the pressure will not rise above a certain pressure (approximately 14 kg/cm ² ), and the control valve 55 will not rise. Since it is provided at a position opposite to the inlet 50 of the water channel 49 of the water heating unit 41, the water discharged from the control valve 55 is drained without being heated by the water heating unit 41, thus eliminating unnecessary power consumption. , you can boil water economically.

In addition, in the above embodiment, the water heating unit is composed of the heater block body, the water pipe, and the heater, but the heater block body and the water pipe may be integrated, or the water pipe and the heater may be integrated. In short, any water heating unit that forms a waterway and heats the waterway is sufficient.

Moreover, although the substance to be extracted, such as coffee powder, is used by being enclosed in a capsule, a container with a filter may be used, as long as it can perform extraction and filtration. Furthermore, it goes without saying that the material to be extracted is not limited to coffee powder.

Effects of the Invention As described above, according to the present invention, the heater block has a substantially cylindrical long hole in the middle of the channel for pouring hot water from the pressurized water injection device at one end to the material to be extracted such as coffee powder at the other end. A main body and a substantially cylindrical heater are installed inside the main body, and a continuous spiral groove is provided from one end to the other end of the outer peripheral surface of the main body, and seal rings provided at both ends are inserted into the elongated hole to airtightly A water heating unit is provided with a substantially cylindrical water pipe forming a waterway forming a part of the flow path, and a water heater unit is provided in the outer wall of the heater block body, the water pipe is located near the entrance of the elongated hole and communicates with one end of the waterway. An inlet is provided, an outlet is located near the back of the elongated hole and communicates with the other end of the water channel, and an outlet is provided opposite to the inlet, and the water channel is normally open to the outlet. The system is equipped with a control valve that maintains the pressure in the flow path below a certain level when brewing coffee, etc., so when the control valve is opened, the water that is pumped out is drained without being heated. This means that only the water used to extract coffee, etc. is heated, and as a result, water can be boiled efficiently.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional coffee brewing device, FIG. 2 is a sectional view of a coffee brewing device showing an embodiment of the present invention, and FIG. 3 is an enlarged sectional view of the same essential parts.
Fig. 4 is an enlarged cross-sectional view of the same essential parts, Fig. 5 is an exploded perspective view of the same main parts, Fig. 6 is an enlarged sectional view of the same main parts, and Fig. 7 is an enlarged sectional view of the main parts.
The figure is an enlarged perspective view of the main parts, FIG. 8 is a perspective view of the coffee extraction device, and FIG. 9 is a characteristic diagram of the pump. 41...Kettle unit, 44...Heater,
45...Groove, 46...Seal ring, 47...Water tube, 48...Heater block body, 48a...
Long hole, 49... waterway, 50... inlet, 53...
Outflow port, 54...Discharge port, 55...Control valve, 12
5... Pump, 132a... Channel, 146... Capsule.

Claims (1)

[Claims] 1 A heater block body having a substantially cylindrical long hole and a substantially cylindrical heater are installed in the middle of the flow path that pours hot water from the pressurized water injection device at one end to the material to be extracted such as coffee powder at the other end. A continuous spiral groove is provided from one end of the outer peripheral surface to the other end, and seal rings provided at both ends are inserted into the elongated hole to airtightly form a water channel forming a part of the flow path. A water heating unit consisting of a cylindrical water pipe is provided, and an inlet located near the entrance of the elongated hole and communicating with one end of the water channel is provided on the outer wall of the heater block body, and an inlet is located near the back of the elongated hole. An outflow port communicating with the other end of the water channel is provided, and a discharge port opposite the inflow port is provided, and furthermore, the waterway is normally open at the drain port to drain water, and when brewing coffee etc. A device for extracting coffee, etc., equipped with a control valve that maintains a constant pressure inside the flow path.