JPH0251330B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric water boiler used in a coffee brewing apparatus or the like for commercial or household use.

BACKGROUND ART In general, in this type of electric water heater, it has been desired to heat water supplied by a pump after a short period of preheating, and then to instantaneously boil the water to a predetermined temperature.

For this reason, for example, an electric water heater used in a conventional coffee brewing device has a structure as shown in FIG.

That is, in this FIG. 5, 1 is a heater block, which includes a block body 2 and an upper cover 3.
and a lower cover 4, which 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 has the through holes 7 and O.
A recess 10 having an aperture 10a that communicates with the ring 9 in a watertight manner is provided, and the recess 10 has the aperture 10a connected thereto in a watertight manner.
A valve 11 that closes the valve 11 and a valve spring 12 that biases the valve 11 are screwed onto a valve seat 13. 14
is a diffusion plate screwed onto the valve seat 13 with mounting screws 15. Reference numeral 16 denotes an electromagnetic pump, which connects a suction pipe 18 with one end open at the bottom of the water container 17 and the groove 5 of the block body 2 through the pump 16.
It is connected to a connecting pipe 19 that communicates with the water channel 5a of the heater block 1 formed by the heater block 1.

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. Note that an outlet 28 is provided at the bottom of the filter holder 22.

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. 32 is block body 2
This automatic temperature regulator 32 is attached with a heat sensitive part in close contact with the heater block 1, and controls the temperature of the heater block 1 by restricting the supply of electricity to the heating element 6. 33 is coffee powder.

The operation of the electric water heater 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 3
2, the temperature is controlled to a predetermined temperature.

Next, a predetermined amount of coffee powder 33 is put into the filter 26 housed in the filter holder 22, and is brought into rotational engagement with the hook plate 20. The preparation for coffee extraction is now complete.

Next, when the demitasse coffee cup 30 is set on the receiving plate 29 which is almost directly below the outlet 28 of the filter holder 22 and the pump 16 is operated, the water in the water container 17 is pumped through the suction pipe 18, It is pumped into the block body 2 via the connecting pipe 19. The water pumped into the block main body 2 is boiled by heat transfer from the heater block 1 while passing through the spiral waterway 5a and becomes hot water, passes through the through hole 7 and presses the valve 11.
It passes through the coffee powder 33 via the diffusion plate 14, extracts the coffee liquid, flows out from the outlet 28, and is poured into the demitasse coffee cup 30, thereby making coffee.

On the other hand, the temperature of the heater block 1 decreases as heat is taken away by the water. Then, the automatic temperature regulator 32 operates to energize the heating element 6 again, raising the temperature of the heater block 1, and when it reaches a predetermined temperature, the automatic temperature regulator 32 operates again to energize the heating element 6. The power supply to the heater block 1 is stopped and the temperature of the heater block 1 is maintained within a certain range.

Problems to be Solved by the Invention In such a conventional configuration, the block body 2 is heated in order to ensure that water passing through the groove 5 provided on the surface is heated by the heating element 6 embedded in the back surface of the block body 2. Since the heat capacity of the upper cover 3 disposed on the upper surface of the heater block 2 needs to be as large as that of the block body 2, it takes a considerable amount of time for the heater block 1 to reach a predetermined temperature. It was not easy to use, as the material costs were high, and productivity was also not very good.

The present invention solves these problems,
The purpose is to provide an electric water heating device that is easy to use and has high productivity.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a substantially cylindrical heater internally arranged with good thermal conductivity, and a continuous spiral spiral extending from one longitudinal end to the other end of the outer periphery. A water tube is formed into a substantially cylindrical shape using a good heat conductor, and a water pipe is formed into a substantially rectangular shape using a good heat conductor.
The heater block body has a substantially cylindrical long hole in its center, the water tube is housed in the long hole of the heater block body, and the groove is airtightly formed with the inner wall of the long hole of the heater block body. The heater block is constructed of a spiral water channel, and an inlet and an outlet provided in the heater block body so as to communicate with one end and the other end of the water channel, respectively.

Effect: According to this configuration, the temperature rise by the heater in the heater block body quickly rises before water is injected into the waterway, so efficient heat exchange can be achieved when water is injected, making it extremely easy to use. It will be good.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 3, 41 is a base, and 42 is a bottom plate. This bottom plate 41 has rubber legs 43, and fixedly supports the base 41 via side plates 44. 45 is a water tank installed at the rear of the base 41, and the bottom of this water tank 45 has an opening 4.
6, and this opening 46 is communicated with an inlet 49 of an electromagnetic pump 48 via a communication bushing 47. The pump 48 is attached to the base 41 via a vibration-proof rubber 50. Reference numeral 51 denotes a water boiling unit, which includes a substantially cylindrical heater 52, a substantially cylindrical shape with a diameter of about 30 mm and a length of about 90 mm, and a spiral shape continuous from one end to the other on its outer periphery and having a cross-sectional area. A groove 53 of approximately 11 mm ² is provided, and an O-ring groove 54 is provided at both ends of the groove 53, and a thermal diffusion compound 55 containing silicon as a main component is filled between the heater 52 and the heater 52.
A water pipe 56 is made of a good thermal conductor such as a copper alloy and is internally arranged to have a good thermal conductivity, and a water pipe 56 is formed into a substantially rectangular shape with a good thermal conductor such as aluminum die-casting, and a substantially cylindrical long hole 57 is provided in the center of the water pipe 56. Heater block body 5 equipped with
The long hole 57 of the heater block main body 58 accommodates a water tube 56 with O-rings 59 attached to the O-ring grooves 54 at both ends thereof, and the inner wall 60 of the long hole 57 and the groove 53 of the water tube 56 A spiral water channel 61 is formed in an airtight manner. The water pipe 56 is screwed onto the heater block main body 58 with a mounting screw 62.

The heater block main body 58 also has an inlet 65 on the right thick wall near the inlet of the elongated hole 57, which has a check valve 64 screwed thereon, which communicates with the outlet of the pump 48 through a synthetic resin pipe 63. A spout 6 is provided on the thin wall surface on the bottom near the back of the elongated hole 57.
6 is provided, whereby the water channel 61 communicates airtightly from the inlet 65 to the outlet 66. 67 is a terminal plate welded to the lead wire 68 of the heater 52.

69 is a first screw 71 located near the injection port 65 from the center of the right side of the thick wall surface of the heater block body 58.
This is the first automatic temperature controller of the disc bimetal type, which is heat-sensitively equipped with a fastening fitting 70 that is tightened with. Reference numeral 72 denotes a second automatic temperature regulator of a laminated bimetal type that is heat-sensitively provided by tightening with a second screw 73 from the center of the left side of the thick wall surface of the heater block main body 58 toward the spout 66.

Further, a drain port 74 is provided on the thick wall surface on the right side facing the injection port 65 near the entrance of the elongated hole 57 of the heater block main body 58, and a safety valve 75 is screwed into the drain port 74. This safety valve 75
The operating valve 75a is brought into operation by pressing the operating valve 75a via the spring 75b by a rail 78 provided on a lever 77 which is slidable in conjunction with a handle 76 configured to be freely rotatable below the heater block main body 58. , and when the rail 78 is not pressing and is not in operation, the water channel 61 is open.

Reference numeral 79 denotes a capsule stand, which has a recess 80 in the center, a drip hole 81 in the center of the recess 80, and a capsule 83 in which coffee powder or the like 82 is sealed is placed. It is.
Reference numeral 87 denotes an elevating plate, and this elevating plate 87 is provided integrally with the capsule stand 79. 90 is a ring,
A holder 96 provided with the handle 76 is rotatably provided. 100 is a guide ring,
A nozzle 104 with an acutely tapered tip is provided in the upper part of the storage portion 103 of the capsule 83, and a nozzle hole 106 is provided in the tapered portion of the nozzle 104.

109 is a pair of hook plates provided on the capsule stand 79, 111 is a water tank lid, 115 is a demitasse coffee cup, and 116 is a receiving plate.

Next, the main electric circuits will be explained. In FIG. 4, a diode 120, which is a half-wave rectifier, is connected in series with the second automatic temperature controller 72.
A first automatic temperature controller 69 is connected in parallel to this series connection. Furthermore, this parallel connection body and the heater 52 are connected in series. On the other hand, pump 4
8 is the first pump via the pump switch 117a.
automatic temperature controller 69 and second automatic temperature controller 7
2, the diode 119, and the heater 52.
7 to form a circuit.

To explain the operation in the above configuration, first, fill the water tank 45 with a predetermined amount of water, and then turn on the power switch 1.
17 to start energizing the heater 52, the first and second automatic temperature regulators 69, 72
As a result, the heater block 1 begins to be controlled to a predetermined temperature.

Next, place the capsule 83 on the capsule stand 79,
By pushing the handle 76, the capsule platform 79 is raised together with the lifting platform 87 via the lever 77, and the handle 76 is further pushed to engage the holder 96 and the hook plate 109. As a result, the capsule 83 placed on the capsule stand 79
is housed in the housing section 103 of the guide ring 100, and the nozzle hole 106 opens into the inside of the capsule 83.

Next, the demitasse coffee cup 115 is placed on the receiving plate 116. In this state, when the pump switch 117a is operated, the pump 48 is activated, and water flows into the suction port 49 of the pump 48 from the opening 46 at the bottom of the water tank 45 through the communication bushing 47. Water pressurized by the pump 48 passes through the pipe 63 from the outlet of the pump 48, passes through the check valve 64, and flows into the spiral water channel 61 from the inlet 65 of the heater block body 58. Since the water heating unit 51 is heated to approximately 90°C to 105°C, water flows through the water pipe 5 while flowing through the spiral waterway 61.
Heat is removed from the groove 53 of No. 6 and the inner wall 60 of the block body 58, and the water becomes hot, just before boiling, and flows out from the spout 66. The hot water flowing out from the spout 66 of the water boiling unit 51 passes through the ring 90 and then flows through the nozzle hole 106 to the coffee grounds 82 in the capsule 83.
It is squirted out to become coffee liquid, which is dripped and stored in the demitasse coffee cup 115.

On the other hand, the temperature of the water heating unit 51 decreases because the amount of heat is taken away by the water passing through the water channel 61. When the temperature of the hot water flowing out from the spout 66 drops to about 85°C, the temperature at a position closer to the spout 66 from the center of the left side of the thick side of the heater block body 58 drops to about 90°C.
The second automatic temperature regulator 72 operates to close the circuit, and the temperature of the water heating unit 51 rises again.

The coffee extraction time is about 30 seconds, and the amount of water flowing at that time is about 100 c.c. to 60 c.c./30 seconds.

As described above, according to this embodiment, the heat capacity of the water boiling unit 51 is smaller than that of the conventional water heating unit, so that the temperature of the water heating unit 51 increases quickly by the heater 52, and as a result, the usability is extremely good. Furthermore, since the amount of thermally conductive material such as aluminum constituting the water heating unit 51 can be reduced, it is possible to obtain a product with low cost and good productivity.

In the above embodiment, the elongated hole 57 of the heater block main body 58 was described as a blind hole, but a through hole may also be used.
It goes without saying that the positions of the inlet 65 and the outlet 66 communicating with the can be changed as appropriate.

Also, an O-ring 59 that forms the waterway 61 airtightly
is not limited to this O-ring 59,
Any configuration may be used as long as the water channel 61 is formed in an airtight manner.

Further, in the above embodiment, in order to form the heater 52 and the water pipe 56 with better thermal conductivity, the heat diffusion compound 55 was filled between them.
If a certain degree of thermal conductivity is maintained by increasing dimensional accuracy, etc., it can be changed to other materials as appropriate.

Effects of the Invention As described above, according to the present invention, a substantially cylindrical heater is housed inside with good thermal conductivity, and a continuous spiral groove is provided from one longitudinal end to the other end of the outer periphery. A water tube formed in a substantially cylindrical shape made of a good conductor, a heater block body formed in a substantially rectangular shape made of a good thermal conductor and equipped with a substantially cylindrical long hole in the center, and the long hole of the heater block main body has the above-mentioned long hole. A water channel that accommodates a water pipe and is airtightly formed by the groove and the inner wall of the elongated hole, and an inlet and an outlet provided in the heater block body so as to communicate with one end and the other end of the water channel, respectively. Because of this structure, it is possible to reliably heat water through efficient heat exchange, and as a result, it is extremely easy to use and can also improve productivity.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of the main parts of an electric water boiler showing an embodiment of the present invention, FIG. 2 is a sectional view of the same electric water boiler, FIG. FIG. 4 is a circuit diagram of the electric water heater, and FIG. 5 is a sectional view of the conventional electric water heater. 51...Kettle unit, 52...Heater,
53... Groove, 54... O-ring groove, 55... Heat diffusion compound, 56... Water tube, 57... Long hole,
58... Heater block body, 59... O-ring, 60... Inner wall, 61... Water channel, 65... Inlet, 66... Outlet.

Claims (1)

[Claims] 1. A water pipe formed into a substantially cylindrical shape with a good thermal conductor, which has a substantially cylindrical heater inside for good thermal conductivity, and has a continuous spiral groove from one longitudinal end to the other end of its outer periphery; A heater block body is formed into a substantially rectangular shape made of a good thermal conductor and has a substantially cylindrical long hole in the center thereof, and the water tube is housed in the long hole of the heater block body, and the groove and the heater block body are connected to each other. An electric water boiler consisting of a spiral waterway formed airtight with the inner wall of a long hole, and an inlet and an outlet provided in the heater block body so as to communicate with one end and the other end of the waterway, respectively. Device.