JP3888496B2 - Hot water supply device and coffee extractor using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the hot water supply technology field of hot water storage type coffee extractors, and in particular, by improving the hot water storage tank, while maintaining a hot water supply capacity of a certain amount or more, it can respond to a small amount of hot water supply request and has an appropriate temperature during hot water discharge. The present invention relates to a hot water supply apparatus that can efficiently perform heating and can perform coffee extraction without waste in response to changes in the number of customers when applied for business use, and a coffee extractor using the apparatus.
[0002]
[Prior art]
The hot water storage type coffee extractor is equipped with a hot water storage tank that stores hot water at a constant temperature, and by adding new water to the hot water storage tank according to the amount of coffee to be extracted, the hot water level in the hot water storage tank is increased, The hot water in the upper part of the tank is jetted from a hot water jet pipe provided in the upper part of the tank to a dripper or funnel as a coffee strainer, and a required amount of coffee is dripped into the decanter. For example, various publications are disclosed in Japanese Utility Model Publication No. 51-42627, Japanese Patent Publication No. 51-33026, Japanese Patent Publication No. 51-36659, and the like.
[0003]
These hot water supply devices basically have a structure in which a hot water storage tank is equipped with an electric heater and temperature sensing means for controlling the energization of the hot water tank, and the water supplied into the hot water storage tank is heated by the heater and is constant. After reaching the temperature, energization of the heater is controlled by the temperature sensing means so that the hot water temperature is always kept at an appropriate temperature. When the hot water is discharged at the time of coffee extraction, the temperature of the hot water lowered by the replenishing water in the hot water storage tank is sensed by the temperature sensing means, and heating is performed by energizing the heater, and then the hot water is brought back to the proper temperature. The heating cycle of being held is repeated. The heater includes two types of heaters, a high-power heater and a low-power insulation heater, and the temperature sensing means includes a thermostat for controlling the heater and a temperature-sensitive reed switch for controlling the insulation heater. And are provided.
[0004]
Among such hot water supply devices for hot water storage type coffee extractors, there is a system in which water is supplied to a hot water storage tank by natural flow from a water supply tank provided above the hot water storage tank. This type of hot water supply device is designed to supply the required amount of water by injecting the required amount of water into the water supply tank using a handheld container, and no complicated mechanism such as a water supply pump or operation circuit is required. Therefore, there is an advantage that the device configuration is relatively simple and the cost can be reduced, and it is becoming popular for business use such as restaurants and small coffee shops.
[0005]
In the case of the water supply type hot water supply apparatus by natural flow, the water supply tank has an inclined bottom wall, and the water supply pipe hangs down from the water supply port at the bottom end of the bottom wall. The lower end of the pipe is arranged at the lower central position of the hot water storage tank so that water can be supplied to the lower part of the hot water storage tank. On the other hand, the hot water storage tank has a vertical cylindrical configuration, a heater is attached to the lower portion of the peripheral wall, and a thermostat, a temperature sensitive reed switch, and the like are arranged on the bottom wall portion. In addition, the hot water jet pipe has a hot water inlet communicating with the upper part of the hot water storage tank, and extends out of the hot water storage tank by bypassing a position higher than the hot water storage tank in order to produce a siphon effect. Therefore, the hot water outlet is provided at a position lower than the hot water inlet.
[0006]
At the time of use, the heater is energized in advance so that the water level in the hot water storage tank is immediately below the hot water inlet, and the heater is heated to change the water in the hot water storage tank to hot water of a predetermined temperature (usually 90 to 95 ° C.). After that, it is stored while being kept warm by the action of the warming heater and the temperature sensitive reed switch. At the time of coffee extraction, an amount of water is supplied to the water supply tank so that the water level in the water supply tank is higher than the height of the top of the jet pipe, thereby raising the surface of the hot water in the hot water storage tank and discharging the hot water from the jet pipe. .
[0007]
In this case, since the thermostat at the bottom of the hot water storage tank is cooled by the low-temperature water supplied to the lower part of the hot water storage tank, energization to the heater is turned on simultaneously with the hot water, and the heating action is performed again. After the temperature reaches the predetermined temperature, the thermostat is heated to turn off the power to the heater, and then the hot water is kept at an appropriate temperature by the small heating action by the temperature sensitive reed switch and the heat retaining heater. The
[0008]
[Problems to be solved by the invention]
In such a hot water storage type coffee extractor, there is a demand to be able to extract a small amount of about one cup of coffee while securing an extraction amount with a certain width for a plurality of cups of coffee cups. For example, when used in a restaurant or the like, there is a clear difference in the amount of coffee provided between the time when there are many customers and the time when there are few customers. When there are many customers, it is necessary to extract about 15 cups of coffee at the same time. On the other hand, when there are few customers, only about 1 cup may be extracted in 30 minutes or more.
[0009]
However, it has been technically difficult to meet such a demand in the conventional hot water storage type coffee extractor that employs the above-described natural flow water supply system.
[0010]
That is, in order to secure the extraction amount with a certain width for a plurality of coffee cups, a relatively large capacity hot water storage tank is required. When using such a large hot water storage tank, it is necessary to supply a certain amount or more of water to raise the surface of the hot water in the hot water storage tank and to discharge hot water from the hot water jet pipe. You can't just pour hot water.
[0011]
Moreover, although the hot water temperature in the hot water storage tank is lowered by the newly supplied water at the time of hot water discharge, it is troublesome to raise the lowered hot water temperature by a heater and keep it at an appropriate temperature. That is, even if a small amount of water is mixed in a large amount of hot water, the temperature may not be lowered so that the thermostat at the bottom of the hot water storage tank senses that energization of the heater is required. When the state where heating is not performed after the hot water is generated in this way, natural convection is performed in the hot water storage tank. As a result, the entire hot water temperature including the vicinity of the hot water surface is lowered, and the hot water at the next hot water becomes wet. Invite.
[0012]
Therefore, it is conceivable to reduce the hot water storage tank to some extent so that the thermostat can detect a decrease in hot water temperature even by supplying about one cup of water. However, in such a configuration, even when the amount of hot water is small and hot hot water remains at the top of the hot water storage tank, the heater is energized and heated, and the hot water is heated by the convection at the bottom of the tank. Until the thermostat senses that and the heater stops, the hot water in the upper part of the hot water storage tank becomes overheated and boiling easily occurs. When this boiling is intense, the hot water surface rises suddenly, and the hot water that has entered the hot water jet pipe from the hot water inlet exceeds the top height of the hot water jet pipe and is discharged from the hot water outlet. There is a problem that a situation occurs in which hot water is supplied.
[0013]
Therefore, from the above situation, it has been difficult to cope with a request to make it possible to extract a small amount of about one cup of coffee while securing the amount of extraction with a certain width for a plurality of cups of coffee. . As a result, it is necessary to use a model that can extract at least 5 cups of coffee at restaurants, etc., and remains after being extracted in a time zone with few customers, and after 15-30 minutes, There was a lot of wasted coffee that had to be discarded.
[0014]
The present invention has been made in view of such circumstances, and while maintaining a hot water supply capacity of a certain amount or more, can respond to a small amount of hot water supply request, can efficiently perform appropriate temperature heating at the time of tapping, and is applied for business use. It is an object of the present invention to provide a hot water supply device that can quickly extract coffee in response to a change in the number of customers and a coffee extractor using the device.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a water supply tank having a water injection port for injecting water and a water supply port for allowing the injected water to flow down, and the water supply port of the water supply tank hang down for a certain length. A water supply pipe is disposed below the water supply tank so as to surround the water supply pipe, and has an electric heater that heats water supplied from the water supply pipe at a lower portion of the peripheral wall and senses water temperature at the bottom wall portion. The heater has a vertically long hot water storage tank having temperature sensing means for controlling the hot water temperature after heating by switching on / off the power to the heater, and a hot water inlet communicating with the upper part of the hot water storage tank. A hot water jet pipe that bypasses a position higher than the hot water storage tank and extends outward from the hot water storage tank and has a hot water outlet at a position lower than the hot water inlet, and the hot water storage tank is provided via the water supply tank. In the hot water supply apparatus for raising the hot water level in the hot water storage tank by supplying water to the lower part of the tank and discharging hot water from the hot water jet pipe, the hot water inlet of the hot water jet pipe and the outer periphery of the water supply pipe are in the hot water storage tank. By providing an inner cylinder with a peripheral wall on the side, the space in the hot water storage tank is partitioned into an inner peripheral side space and an outer peripheral side space, and these inner peripheral side space and outer peripheral side space are formed at the lower end of the inner cylinder. Provided is a hot water supply device characterized in that it is communicated by a formed opening.
[0016]
According to the present invention, when the hot water storage tank is downsized and the temperature sensing means at the bottom of the hot water storage tank is easily cooled by a small amount of water supplied from the hot water supply pipe, the heater is directly heated mainly by the inner cylinder. It is hot water in the outer peripheral side space formed on the outer peripheral side, and the hot water in the inner peripheral side space is heated not by convection but only by heat transfer. Therefore, boiling occurs mainly only in the hot water in the outer peripheral side space, but since this outer peripheral side space is arranged in a state of being partitioned outside the hot water inlet of the hot water jet pipe, bumpy hot water enters the hot water jet pipe. There is no such thing as unnecessary hot water.
[0017]
Further, according to the present invention, since the outer peripheral side space and the inner peripheral side space communicate with each other through the opening at the lower end of the inner cylinder, the hot water boiled in the outer peripheral side space passes through this opening. It flows into the bottom of the peripheral space and a high temperature is quickly detected by the temperature sensing means. Therefore, the power supply to the heater is turned off before excessive boiling occurs, and overboil can be effectively prevented.
[0018]
Therefore, according to the present invention, it becomes possible to respond to a request for a small amount of hot water, for example, about one cup, while maintaining a certain level of hot water supply capability, and also to efficiently perform appropriate temperature heating at the time of tapping. Therefore, when it is applied for business use, it is not necessary to perform extra coffee extraction even in a time zone in which the number of customers is reduced, and waste such as discarding of excess coffee that has conventionally occurred can be eliminated.
[0019]
According to a second aspect of the present invention, there is provided the hot water supply apparatus according to the first aspect, wherein the inner cylinder is detachable from the hot water storage tank.
[0020]
According to a third aspect of the present invention, there is provided the hot water supply apparatus according to the second aspect, wherein a positioning tongue piece contacting the inner peripheral surface of the hot water storage tank is provided at the upper and lower ends of the inner cylinder. .
[0021]
According to a fourth aspect of the present invention, in the hot water supply apparatus according to any one of the first to third aspects, when at least 100 cc of water is added to the water supply tank in a full water state where the water level in the hot water storage tank is directly below the hot water inlet The hot water supply is characterized in that the diameter of the inner bottom of the water supply tank, the diameter of the water supply pipe, and the diameter of the hot water storage tank are set so that the water level in the water supply tank or the water supply pipe is higher than the top of the hot water jet pipe. Providing the device.
[0022]
According to a fifth aspect of the present invention, in the hot water supply apparatus according to any one of the first to fourth aspects, the hot water outlet of the hot water jet pipe is disposed 1 cm or more below the water level when the hot water storage tank is full. A hot water supply device is provided.
[0023]
According to a sixth aspect of the present invention, there is provided the hot water supply apparatus according to any one of the first to fifth aspects, wherein the hot water jet pipe has a shower at the hot water outlet.
[0024]
According to a seventh aspect of the present invention, there is provided the hot water supply apparatus according to any one of the first to sixth aspects, wherein the water supply tank has a manually openable / closable lid at a water inlet.
[0025]
In invention of Claim 8, the 1st hot water supply apparatus part for small persons of the structure which sets the capacity | capacitance of a hot water storage tank to 1 liter or less by the hot water supply apparatus in any one of Claim 1-7, A second hot water supply unit for a large number of people having a configuration in which the capacity of the hot water storage tank is set to 2 liters or more in a configuration in which the inner cylinder is excluded from the hot water supply device according to Item 1, 5, 6 or 7; A hot water supply apparatus is provided, wherein a first hot water supply apparatus section and a second hot water supply apparatus section are installed in parallel in the same case body.
[0026]
According to the ninth aspect of the present invention, in addition to the hot water supply apparatus according to any one of the first to eighth aspects, an electric heating type heat insulating board disposed below the hot water outlet of the hot water jet pipe, and detachable on the heat insulating board. There is provided a coffee brewing machine comprising an installed decanter and a dripper or funnel serving as a coffee strainer disposed above the decanter.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a hot water supply apparatus and a coffee extractor using the apparatus according to the present invention will be described with reference to the drawings.
[0028]
FIG. 1 is a front view showing the overall configuration of the coffee brewing machine, and FIG. 2 is a side view of FIG. FIG. 3 is a cross-sectional view showing the hot water pouring device portion of the coffee extractor shown in FIG. 1, and FIG. 4 is a perspective view showing the inner cylinder of the hot water storage tank shown in FIG. FIG. 5 is a graph showing the heating characteristics according to this embodiment, and is a graph showing the relationship between the temperature of the thermostat in the hot water storage tank and the tank hot water temperature together with the conventional example.
[0029]
As shown in FIGS. 1 and 2, the coffee brewing machine of the present embodiment has a stand-type case body 1 having a shape in which an intermediate portion in the vertical direction on the front side is opened, and the left side when viewed from the front side of the case body 1. A small-capacity coffee extractor section 2 is installed in the right side, and a large-capacity coffee extractor section 3 is installed on the right side in parallel with the small-capacity coffee extractor section 2. The small-capacity coffee extractor unit 2 includes a first hot water supply unit 4 to which the hot water supply device of the present invention is applied. The first hot water supply unit 4 includes, for example, a hot water storage tank 5 having a capacity of 1 liter. I have. The large-capacity coffee extractor unit 3 is configured to incorporate a second hot-water supply unit 6 that is different from the hot-water supply device of the present invention only in a hot water storage tank. It has a 3 liter hot water storage tank.
[0030]
As shown in FIG. 1, the small-capacity coffee extractor unit 2 includes an electrothermal heat insulating board 7 provided on the base portion of the case body 1 and a small-sized detachably mounted on the heat insulating board 7. A decanter 8 and a detachable dripper 9 serving as a coffee strainer mounted above the decanter are provided. Similarly, the large-capacity coffee extractor unit 3 includes an electric heating type heat insulating board 10 provided on the base portion of the case body 1, a large decanter 11 detachably mounted on the heat insulating board 10, and the decanter 11 and a funnel 12 serving as a coffee strainer that is attached to and detached from the case body. Further, on the upper front surface of the case body 1 are switches 13a and 13b for switching electricity to the heat insulating panels 4 and 10 of the coffee extractors 2 and 3, and a power switch 14a for switching power to the hot water supply units 4 and 6. , 14b, and hot-water supply lamps 15a, 15b indicating a state where coffee can be extracted.
[0031]
Next, the 1st hot water supply apparatus part 4 which comprises the small capacity coffee extractor part 2 is demonstrated with FIG.2, FIG.3 and FIG.4.
[0032]
As shown in these drawings, the small-capacity coffee extractor unit 2 basically has the hot water storage tank 5 described above, a water supply tank 16 for supplying water to the hot water storage tank, and hot water from the hot water storage tank 5 to the outside. It has a configuration including a hot water jet pipe 17 for jetting.
[0033]
The water supply tank 16 is provided in the upper part of the case body 1, and is comprised by the bottom wall 16a which inclines downward toward one point, and the cover wall 16b which covers the substantially whole surface. A water injection port 18 for injecting water is provided at an upper position of the water supply tank 16, and the water injection port 18 has a top-opening door-like manually openable lid 19 and a filter 20 that can be attached to and detached from the inside of the lid 19. Is provided. A water supply port 21 through which the injected water flows down is opened at the lowermost position of the bottom wall 16a of the water supply tank 16, and a water supply pipe 22 communicating with the water supply port 21 hangs down from the water supply port 21 for a certain length. Is provided.
[0034]
On the other hand, the hot water storage tank 5 is constituted by a vertically long cylindrical main body and an upper end plate 5a that seals the upper surface of the main body, and the horizontal inner wall 1a of the case body 1 via the upper end plate 5a. It is fixed in a suspended state. The hot water storage tank 5 is located below the water supply tank 16 and surrounds the water supply pipe 22 that hangs down from the water supply port 21 of the water supply tank 16 on the center line thereof. The water supply pipe 22 extends to the vicinity of the bottom wall 5 b of the hot water storage tank 5 and opens downward, and the opening 22 a faces the center of the bottom wall 5 b of the hot water storage tank 5.
[0035]
An electric heater 23 for heating the water supplied from the water supply pipe 22 is attached to the lower part of the peripheral wall 5c of the hot water storage tank 5 so as to surround the peripheral wall 5c in a band shape. This heater 23 has a configuration including a 600 W heater portion for heating the supplied low-temperature water and a 40 W heat retention heater portion for keeping hot water generated by heating, for example. Both heaters can be turned on and off by the power switch 14a.
[0036]
A thermostat 24 and a temperature sensitive reed switch 25 are provided on the bottom wall 5b of the hot water storage tank 5 as temperature sensing means for sensing the water temperature and switching the energization of the heater 23 on and off to control the hot water temperature after heating to a constant level. Is provided. The thermostat 24 is connected in series between the heater unit and the power supply unit. When the water temperature in the lower part of the hot water storage tank 5 is low, the thermostat 24 detects this and turns on the energization circuit to the heater. It turns off when it reaches a set temperature, for example, 80 ° C. The set temperature of 80 ° C. based on the lower water temperature corresponds to the case where the hot water temperature in the upper portion of the hot water storage tank 5 becomes 92 ° C., for example. Further, the temperature sensitive reed switch 25 turns on the energization circuit to the heat retaining heater when the water temperature becomes 80 ° C. or lower, and prevents the hot water temperature in the hot water storage tank 5 from becoming 92 ° C. or lower.
[0037]
The bottom wall 25 of the hot water storage tank 5 is provided with a communication pipe 26 that guides the water in the hot water storage tank 5 to a pressure switch (not shown), and is given a function for preventing danger caused by idling. Further, an exhaust pipe 27 for discharging the air in the tank is provided at the upper end portion of the hot water storage tank 5.
[0038]
A hot water jet pipe 17 is connected to the upper part of the hot water storage tank 5. The hot water jet pipe 17 has a hot water inlet 28 communicating with the upper part of the hot water storage tank 5, extends around a position higher than the hot water storage tank 28, and extends to a position above the heat insulating plate 7 outside the hot water storage tank 28. A hot water outlet 29 is provided at a position lower than the inlet 28. A shower 30 is provided at the tip of the hot water outlet 29, and hot water is sprayed on the coffee powder in the dripper 9 by the shower 30.
[0039]
In the present embodiment, the water supply tank 16 or the water supply pipe when, for example, 140 cc of water is added to the water supply tank 16 under a full water condition (the state shown in FIG. 3) where the water level a in the hot water storage tank 5 is directly below the hot water inlet 28. The diameter of the inner bottom of the water supply tank 16, the diameter of the water supply pipe 22, and the diameter of the hot water storage tank 5 are set so that the water level in FIG. 22 (the phantom line b in FIG. 3) is higher than the top c of the hot water jet pipe 17. It is set. That is, the replenishment of water up to the water level b in the water supply tank 16 is set as the water supply amount for one cup of coffee, and in this embodiment, hot water is ejected by this amount of water supply. Moreover, the height position of the hot water outlet 29 of the hot water jet pipe 17 is arranged below with a difference d of 1 cm or more from the water level a when the hot water storage tank 5 is full. Thereby, it sets so that the hot water runout at the time of hot water jetting may become favorable.
[0040]
In the above-described configuration, the hot water storage tank 5 is provided with the inner cylinder 31 in which the peripheral wall 31a is arranged on the outer peripheral side of the hot water inlet 28 of the hot water jet pipe 17 and the water supply pipe 22. Thereby, the space in the hot water storage tank 5 is partitioned into an inner circumferential space A and an outer circumferential space B. Further, the inner circumferential space A and the outer circumferential space B are communicated with each other through an opening 32 formed in the lower end portion of the inner cylinder 31. The inner cylinder 31 is configured as a separate body from the hot water storage tank 5 and is detachable from the hot water storage tank. The upper and lower end portions of the inner cylinder 31 are as shown in FIGS. Positioning tongues 33 and 34 that abut against the inner peripheral surface of the peripheral wall 5c of the hot water storage tank 5 are provided.
[0041]
In addition, the structure of the 2nd hot water supply apparatus part 6 for large groups has the structure which excluded the inner cylinder 31 from the 1st hot water supply apparatus part 4 for small people, and enlarged the capacity | capacitance of the hot water storage tank etc. as mentioned above. However, its function is not particularly different from that of the conventional configuration, and thus description thereof is omitted.
[0042]
Next, with reference to FIG. 5 as well, the operation when coffee is extracted using the small-capacity coffee extractor unit 2 will be described.
[0043]
In use, the lid of the water supply tank 16 is first opened, and water exceeding the capacity of the hot water storage tank 5 is poured into the water inlet 18 of the water supply tank 16 by a bottle (not shown). As a result, excess water is discharged from the hot water jet pipe 17 and is collected from the hot water outlet 29 into an appropriate container. Thereby, as shown in FIG. 3, the water level in the hot water storage tank 5 becomes a full water state immediately below the hot water inlet 28.
[0044]
In this state, the heater switch 14a is turned on to energize the heater 23, and the heater heats the water in the hot water storage tank 5 to a predetermined temperature (for example, 92 ° C.). Keeps warm by 25 actions. At the time of coffee extraction, an amount of water is supplied to the water supply tank 16 such that the water level in the water supply tank 16 is higher than the height of the top c of the ejection pipe 17, thereby raising the hot water level a in the hot water storage tank 5. The hot water is discharged from the spout pipe 17. Although this point is not different from the conventional one, in the present embodiment, as described above, hot water can be supplied even by injecting 140 cc of water, for example, so that even one cup of normal coffee can be freely extracted.
[0045]
In the case of this hot water supply, in this embodiment, the hot water storage tank 5 is provided with an inner cylinder 31, the inside of the hot water storage tank 5 is divided into an inner peripheral space A and an outer peripheral space B, and both spaces A and B are communicated near the bottom. By adopting such a configuration, unlike conventional apparatuses, hot water can be heated at a suitable temperature smoothly and without problems.
[0046]
That is, according to the present embodiment, the hot water directly heated by the heater 23 is mainly hot water in the outer peripheral space B formed on the outer peripheral side of the inner cylinder 31, and the hot water in the inner peripheral space A is convection. Instead, it is heated only by heat transfer. Therefore, boiling occurs mainly only in the hot water in the outer peripheral side space B, but since the outer peripheral side space B is arranged in a state of being partitioned outside the hot water inlet 28 of the hot water jet pipe 17, the sudden hot water is hot water. It does not enter the jet pipe 17 and unnecessary hot water is not discharged.
[0047]
Moreover, according to this embodiment, since the outer peripheral side space B and the inner peripheral side space A communicate with each other through the opening 32 at the lower end portion of the inner cylinder 31, the hot water boiling in the outer peripheral side space B is The air flows into the bottom of the inner circumferential space A through the opening 32, and a high temperature is quickly detected by the thermostat 24. Therefore, the power supply to the heater is turned off before excessive boiling occurs, and overboil can be effectively prevented.
[0048]
The characteristic diagram of FIG. 5 shows this over-boiling prevention function. The vertical axis indicates the on / off set temperature (thermostat temperature) of the thermostat 24, and the horizontal axis indicates the hot water temperature in the upper part of the hot water storage tank 5 ( Tank temperature). In FIG. 5, the first characteristic line (broken line) A indicates the temperature change of the first hot water supply device 4 according to the configuration of the present embodiment, and the second characteristic line (solid line) B is the configuration of the present embodiment. The temperature change of the comparative example which excluded the inner cylinder 31 from the 1st hot water supply apparatus part 4 by 3 shows the 3rd characteristic line (solid line) C is a conventional structure which has a large-sized hot water storage tank applied for 5-15 cups The temperature change is shown.
[0049]
In the conventional example (characteristic line C), since the capacity of the hot water storage tank is large and the extraction amount is as large as 5 cups or more, the thermostat is reliably cooled by the water supply, and convection is naturally performed. Corresponding to a temperature of 92 ° C. (90 to 95 ° C.), the heater is almost certainly turned off at a thermostat temperature of 80 ° C., and overboil does not occur.
[0050]
On the other hand, in the comparative example (characteristic line B), although the hot water remains in the upper part of the hot water storage tank, the thermostat is cooled by a small amount of water supply, so the heater is turned on and heating is performed. In addition, since it takes time for high temperature hot water by convection to flow to the bottom of the tank, the temperature of the tank hot water rises to 100 ° C., resulting in boiling and easy boiling. Accordingly, the hot water that has entered the hot water jet pipe from the hot water inlet due to bumping or the like exceeds the top height of the hot water jet pipe and is discharged from the hot water outlet, so that unnecessary hot water is supplied.
[0051]
In the case of the present embodiment (characteristic line A), the thermostat cooling at the time of water supply is the same as that in the comparative example, but the hot water in the outer peripheral side space B is contained inside through the opening 32 at the lower end of the inner cylinder 31. By flowing into the circumferential space A, the thermostat 24 is heated earlier than the convection in the entire tank, so that the heater heating stops halfway and the heating action is weakened so that the tank hot water temperature is kept at a predetermined temperature of 92 ° C. . Therefore, there is no excessive boiling as in the comparative example.
[0052]
As described above, according to the present embodiment, while maintaining a certain amount of hot water supply capability, for example, it is possible to respond to requests for a small amount of hot water, for example, about one cup, and to efficiently perform appropriate temperature heating at the time of tapping. Become. Therefore, when it is applied for business use, it is not necessary to perform extra coffee extraction even in a time zone in which the number of customers is reduced, and waste such as discarding of excess coffee that has conventionally occurred can be eliminated.
[0053]
In the present embodiment, since the inner cylinder 31 is detachable from the hot water storage tank 5, disassembly and cleaning can be easily performed, and in the mounted state, the inner cylinder 31 is provided at the upper and lower ends of the hot water storage tank 5. The positioning tongue pieces 33 and 34 that come into contact with the peripheral surface can be reliably fixed.
[0054]
Moreover, in this embodiment, by providing the small-capacity coffee extractor unit 2 and the large-capacity coffee extractor unit 3 in parallel in the same case body 1, for example, a large amount of coffee of about 15 cups is extracted. In such a case, the large-capacity coffee extractor unit 3 can be used, and it is possible to arbitrarily cope with changes in the size of the customer's feet.
[0055]
【The invention's effect】
As described in detail above, according to the hot water supply apparatus and the coffee brewing machine using the same apparatus according to the present invention, a hot water supply capacity of a certain amount or more is maintained by adopting a configuration in which an inner cylinder is provided in the hot water storage tank. On the other hand, it is possible to respond to a small amount of hot water supply request, efficiently perform appropriate temperature heating at the time of tapping, and have excellent effects such as quick coffee extraction in response to changes in the number of customers when applied for business use .
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a coffee extractor according to the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a cross-sectional view showing an extracted portion of a pouring device of the coffee extractor shown in FIG.
4 is a perspective view showing an inner cylinder of the hot water storage tank shown in FIG. 3. FIG.
FIG. 5 is a graph showing the heating characteristics according to the present embodiment, and is a graph showing the relationship between the temperature of the thermostat in the hot water storage tank and the tank hot water temperature together with the conventional example.
[Explanation of symbols]
1 Stand-type case body
2 Small capacity coffee extractor
3 Large capacity coffee extractor
4 1st water heater unit
5 Hot water storage tank
5a Upper end plate
5b Bottom wall
5c wall
6 Second hot water supply unit
7 Insulation board
8 Decanter
9 Dripper
10 Insulation board
11 Decanter
12 Funnel
13a, 13b Power switch
14a, 14b Power switch
15a, 15b Hot water available lamp
16 Water tank
16a bottom wall
16b covering wall
17 Hot water spout pipe
18 Water inlet
19 Lid
20 filters
21 Water inlet
22 Water supply pipe
22a opening
23 Electric heater
24 Thermostat
25 Temperature-sensitive reed switch
26 Communication pipe
27 Exhaust pipe
28 Hot water entrance
29 Hot water outlet
30 showers
31 inner cylinder
31a Perimeter wall
32 opening
33, 34 Positioning tongue
a Water level
b Virtual line
c Top
d difference
A Inner space
B Outer space

Claims (9)

A water supply tank having a water injection port for injecting water and a water supply port for flowing down the injected water, a water supply pipe hanging from the water supply port for a certain length, and an arrangement surrounding the water supply pipe below the water supply tank An electric heater that heats the water supplied from the water supply pipe at the lower part of the peripheral wall, and senses the water temperature at the bottom wall part to switch on / off the current to the heater. A vertically long hot water storage tank having a temperature sensing means for controlling the hot water temperature constant, a hot water inlet communicating with the upper part of the hot water storage tank, and bypassing a position higher than the hot water storage tank, A hot water jet pipe extending in the direction and having a hot water outlet at a position lower than the hot water inlet, and supplying water to the lower part of the hot water storage tank via the water supply tank. In the hot water supply apparatus that raises the hot water surface and discharges hot water from the hot water jet pipe, in the hot water storage tank, by providing a hot water inlet of the hot water jet pipe and an inner cylinder having a peripheral wall disposed on the outer peripheral side of the water supply pipe, A space in the hot water storage tank is divided into an inner circumferential side space and an outer circumferential side space, and the inner circumferential side space and the outer circumferential side space are communicated with each other through an opening formed in a lower end portion of the inner cylinder. apparatus. The hot water supply apparatus according to claim 1, wherein the inner cylinder is detachable from the hot water storage tank. 3. The hot water supply apparatus according to claim 2, wherein a positioning tongue piece that comes into contact with the inner peripheral surface of the hot water storage tank is provided at the upper and lower ends of the inner cylinder. The hot water supply apparatus according to any one of claims 1 to 3, wherein at least 100 cc of water is added to the water supply tank in a full water state where the water level in the hot water storage tank is directly below the hot water inlet. The hot water supply apparatus is characterized in that the diameter of the inner bottom of the water supply tank, the diameter of the water supply pipe, and the diameter of the hot water storage tank are set so that the water level of the hot water is higher than the top of the hot water jet pipe. The hot water supply apparatus according to any one of claims 1 to 4, wherein a hot water outlet of the hot water jet pipe is disposed at a height of 1 cm or more below a water level when the hot water storage tank is full. Hot water supply device. The hot water supply apparatus according to any one of claims 1 to 5, wherein the hot water ejection pipe has a shower at the hot water outlet. The hot water supply apparatus according to any one of claims 1 to 6, wherein the water supply tank has a manually openable / closable lid at a water inlet. A first hot water supply unit for small persons having a configuration in which the capacity of the hot water storage tank is set to 1 liter or less in the hot water supply device according to any one of claims 1 to 7, and claim 1, 5, 6 or And a second hot water supply unit corresponding to a large number of people having a configuration in which the capacity of the hot water storage tank is set to 2 liters or more with the configuration in which the inner cylinder is excluded from the hot water supply device according to 7, the first hot water supply unit and the first 2. A hot water supply apparatus, wherein two hot water supply apparatus sections are installed in parallel in the same case body. In addition to the hot water supply device according to any one of claims 1 to 8, an electric heating type heat insulating board disposed below the hot water outlet of the hot water jet pipe, a decanter detachably mounted on the heat insulating board, and A coffee extractor comprising a dripper or funnel as a coffee strainer disposed above a decanter.

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