JP2014050578A - Beverage extractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beverage extractor allowing a burst or destruction of a liquid feed path inside a closed space in an assumed part even when double failure in which the closed space is formed on the upstream side or the downstream side of a heating part of the liquid feed path and the heating part or a liquid feed pump goes on operating has occurred.SOLUTION: A beverage extractor includes, inside a storage space of a body provided with a storage tank 8 and an extraction part 2 charged with an extracted material,: a liquid feed path 6 communicating the storage tank 8 and the extraction part 2; a liquid feed pump 11 pressurizing a liquid inside the storage tank 8, and supplying the liquid to the extraction part 2 through the liquid feed path 6; and a heating part 12 disposed on the downstream side of the liquid feed pump 11, and heating the liquid supplied to the extraction part 2. The liquid feed path 6 includes: an upstream side liquid feed path 6A communicating the storage tank 8 and the heating part 12; and a downstream side liquid feed path 6B communicating the heating part 12 and the extraction part 2. An abnormal pressure release part X releasing a pressure when the pressure inside the liquid feed path 6 abnormally rises is disposed between the liquid feed pump 11 of the upstream side liquid feed path 6A and the heating part 12.

Description

  The present invention is provided with a storage tank for storing a liquid and an extraction unit provided with a lid that can open and close an opening for inserting a material to be extracted, and the storage tank and the extraction are provided in a storage space of the main body. A liquid feed path that communicates with the liquid supply section, a liquid feed pump that is disposed in the liquid feed path and pressurizes the liquid stored in the storage tank and supplies the liquid to the extraction section via the liquid feed path, and a liquid feed path in the liquid feed path The present invention relates to a beverage extractor including a heating unit that is disposed on the downstream side of a liquid pump and that heats liquid supplied to an extraction unit.

  Such a beverage extractor extracts beverages such as coffee and tea, and heats and pressurizes the liquid and supplies it to the extraction section charged with the material to be extracted, so that the components contained in the material to be extracted are effective. Can be extracted to extract a high-quality beverage excellent in aroma and taste. Incidentally, various types of coffee such as plain coffee and espresso coffee can be extracted as the coffee.

  In such a beverage extractor, a liquid feed path that communicates the storage tank and the extraction unit is provided in the storage space of the main body constituting the beverage extractor, and the liquid feed path is extracted from the storage tank side. Since the liquid feed pump and the heating part are provided in order toward the part side, by appropriately operating the liquid feed pump and the heating part, the liquid stored in the storage tank is appropriately pressurized and supplied via the liquid feed path. It can heat and can supply to an extraction part (for example, refer patent document 1).

  As such a heating unit, for example, an electric heater is provided in a heating container capable of storing liquid, and the liquid supplied from the liquid feeding path is heated by the electric heater in the heating container. The operation of the electric heater may be performed by, for example, increasing or decreasing the energization amount to the electric heater or turning on / off energization by a switch such as a relay so that the temperature of the liquid in the heating container detected by the hot water temperature sensor becomes a predetermined temperature. Control is performed by turning off or the like. In addition, in order to cope with an abnormal state in which the switch such as a relay or the hot water temperature sensor does not malfunction or operate for some reason, the electric heater continues to operate, and the inside of the heating container becomes abnormally high temperature and high pressure, For example, it has also been proposed to include a safety device such as a thermostat or a thermal fuse. In this case, when the temperature detected by the thermostat exceeds a predetermined abnormal temperature, the thermal fuse is blown at an abnormal temperature. By doing so, the operation of the electric heater can be forcibly stopped to improve safety.

JP 2009-512493 A

Here, in such a beverage extractor, impurities such as dust contained in the liquid flowing through the liquid feeding path, for example, water stains generated in the heating container of the heating unit or in the liquid feeding path, are upstream of the heating unit. In some cases, it accumulates on the liquid supply path on the side or downstream side and closes the liquid supply path. In particular, since the liquid supplied from the heating container to the extraction unit flows through the liquid supply path on the downstream side of the heating unit and is supplied to the extraction unit, structurally, red water accumulates on the downstream side of the heating unit. This is likely to cause blockage of the liquid feeding path.
Assuming that at least the downstream side of the heating unit in the liquid feeding path is closed, the liquid feeding pump disposed on the upstream side of the heating unit is normally a check valve that allows only the flow from the upstream side to the downstream side. Since it functions, between the liquid-feeding pump and the blockage location in the downstream of the heating part in a liquid-feeding path becomes blockage space. The same applies to the case where the upstream side and the downstream side of the heating unit in the liquid supply path are simultaneously closed for some reason.

On the other hand, when the closed space is formed in the liquid supply path as described above, when the electric heater continues to operate (when the safety device is provided, the safety device also malfunctions or When not operating), that is, when a double failure occurs, the enclosed space including the heating unit becomes abnormally high in temperature and pressure as time passes, and the liquid supply path (upstream of the heating unit) in the enclosed space In addition, there is a possibility that a pipe member constituting the downstream liquid supply path) or a connecting portion between the pipe member and the heating part is ruptured / damaged, and high temperature liquid is ejected from the ruptured part.
In addition, when a closed space is formed in the liquid supply path, and when a double failure occurs in which the liquid supply pump continues to operate, the closed space including the heating unit becomes an abnormally high pressure over time. In addition, the pipe member constituting the liquid feed path (the liquid feed path upstream and downstream of the heating part) in the closed space and the connection part between the pipe member and the heating part are ruptured / damaged, and the rupture occurs. There is a possibility that hot liquid will be ejected from the location.

  Even when such a pipe member or a connecting portion between the pipe member and the heating unit is provided at a plurality of locations in the liquid supply path, each has the same structure (the pipe member has a common material, thickness, etc. Or a fixing member for connecting and fixing the pipe member and the heating part is generally employed), so that the pipe member or the connecting part between the pipe member and the heating part is used. It is unpredictable whether or not the high temperature liquid is ejected from any of the locations, and the high temperature beverage is ejected from an unforeseen location and inadvertently scattered around the beverage extractor. , It may cause unexpected damage.

  Therefore, in the unlikely event, at least the downstream side of the heating part in the liquid supply path is blocked, the heating part (the safety device also fails if there is a safety device) and the liquid supply pump continue to operate, so-called double failure occurs, Even when a high-temperature liquid is ejected from the closed space on the upstream side or downstream side of the heating unit, it is possible to prevent the high-temperature liquid from being ejected from an unexpected location. It is desired to improve the structure so that damage to the apparatus or the like can be reduced as much as possible.

  The present invention has been made in view of such a situation, and the purpose of the present invention is that, by any chance, a closed space is formed on the upstream side and the downstream side of the heating unit in the liquid feeding path, and the heating unit or the liquid feeding pump continues to operate. An object of the present invention is to provide a beverage brewing machine that can be generated at a location where rupture / breakage of a liquid supply path in the closed space is assumed even when a double failure occurs.

In order to achieve the above object, a beverage extractor according to the present invention is provided with a storage tank for storing a liquid and an extraction unit having a lid that can open and close an opening for charging an extraction material. In the storage space of the main body, a liquid supply path that communicates the storage tank and the extraction unit, and a liquid that is disposed in the liquid supply path and that is stored in the storage tank is pressurized. Beverage extractor comprising: a liquid feed pump that supplies the liquid to the extraction unit via a heating unit; and a heating unit that is disposed on the downstream side of the liquid feed pump in the liquid supply path and that heats the liquid to be supplied to the extraction unit And the characteristic composition is
The liquid feeding path includes an upstream liquid feeding path that communicates the storage tank and the heating unit, and a downstream liquid feeding path that communicates the heating unit and the extraction unit,
An abnormal pressure release part for releasing the pressure when the pressure in the liquid supply path abnormally rises is provided between the liquid supply pump and the heating part in the upstream liquid supply path. .

  According to the above characteristic configuration, basically, the storage tank and the extraction unit are communicated with each other within the storage space of the main body, and the liquid supply pump is provided on the storage tank side and the heating unit is provided on the extraction unit side. Therefore, by appropriately operating the liquid feeding pump and the heating unit, the liquid stored in the storage tank can be appropriately pressurized and heated via the liquid feeding path to be supplied to the extraction unit. it can.

In particular, the liquid supply path includes an upstream liquid supply path that communicates the storage tank and the heating unit, and a downstream liquid supply path that communicates the heating unit and the extraction unit, and the pressure in the liquid supply path abnormally increases. Since the abnormal pressure release part that releases the pressure is disposed between the liquid feed pump and the heating part in the upstream liquid feed path, in the unlikely event, the upstream and downstream sides of the heating part in the liquid feed path Even in the case where a double failure occurs in which a closed space is formed between them and the heating unit or the liquid feed pump continues to operate, the abnormally increased pressure in the closed space can be released from the abnormal pressure release portion, It can be generated at a specific location (abnormal pressure release portion) in the storage space of the main body, which is assumed in advance to eject liquid accompanying release of the abnormal pressure.
In addition, since the abnormal pressure release part is disposed between the liquid feed pump and the heating part in the upstream liquid supply path, after the pressure in the closed space rises abnormally and the liquid is ejected from the abnormal pressure release part Even if the liquid feed pump continues to operate, the liquid ejected from the abnormal pressure release part is a relatively low temperature liquid mainly supplied from the storage tank and heated by the heating part. It is possible to reduce the influence on people and equipment existing around the extractor.

In addition, as explained in the column of the background art and the problem to be solved by the invention about the closed space of the liquid feeding path, in the beverage extractor, impurities such as dust contained in the liquid flowing through the liquid feeding path For example, water scum generated in the heating container of the heating unit or in the liquid feeding path is likely to accumulate in the upstream liquid feeding path or the downstream liquid feeding path, particularly in the downstream liquid feeding path. There is a risk that the liquid supply path may be blocked at these locations. If at least the downstream liquid supply path in the liquid supply path is blocked, the liquid supply pump disposed on the upstream side of the heating unit normally allows only a flow from the upstream side to the downstream side. Therefore, a space between the closed portion of the downstream liquid supply passage and the liquid supply pump is a closed space. Similarly, when the upstream liquid supply path (downstream of the liquid supply pump) and the downstream liquid supply path are simultaneously blocked for any reason, the downstream liquid supply path is blocked and the upstream liquid supply path is blocked. During this time, it becomes a closed space.
In addition, a double failure is caused when a closed space is formed as described above, and when the heating unit or the liquid pump continues to operate for some reason (safety for forcibly stopping the operation of the heating unit or the liquid pump) And the pressure in the enclosed space is abnormally increased.

  Therefore, even if a closed space is formed on the upstream side and the downstream side of the heating unit in the liquid feeding path and a double failure occurs in which the heating unit or the liquid feeding pump continues to operate, It was possible to provide a beverage extractor that can be generated at a location where the liquid delivery path of the product was supposed to be ruptured or damaged.

  According to a further characteristic configuration of the beverage extractor according to the present invention, the upstream liquid supply path communicates the storage tank and the lower part of the heating unit, and the downstream liquid supply path communicates with the upper part of the heating unit and the extraction. The point is to communicate with the department.

  According to the above characteristic configuration, the abnormal pressure release portion is disposed in the upstream liquid supply passage that communicates the storage tank and the lower portion of the heating portion among the liquid supply passages provided in the storage space of the main body. Even when the above double failure occurs, the pressure from the abnormal pressure release part of the upstream liquid supply path located in the lower part of the heating part is earlier than the downstream liquid supply path communicating the upper part of the heating part and the extraction part. Is opened, and liquid can be preferentially ejected from the lower part of the heating part while preventing the liquid from ejecting from the upper part of the heating part. Thereby, it is possible to prevent liquid from splashing from the upper part of the beverage extractor and causing unexpected damage to surrounding people and devices. For example, the abnormal pressure release part of the upstream liquid supply path connected to the lower part of the heating part is surrounded by the storage space forming member that forms the storage space of the main body and the heating part, so that the abnormal pressure release part It is possible to effectively and simply prevent scattering of the liquid ejected from the liquid.

A further characteristic configuration of the beverage extractor according to the present invention is such that a pressure from the primary side is maintained below a predetermined supply pressure between the liquid feeding pump and the heating unit in the upstream liquid feeding path. A configured relief valve is arranged,
The abnormal pressure release portion is located between the relief valve and the heating portion in the upstream liquid supply path.

According to the above characteristic configuration, the relief valve configured to maintain the pressure from the primary side below a predetermined supply pressure is disposed between the liquid feed pump and the heating unit in the upstream liquid feed path. Therefore, even if the double fault occurs and the pressure in the closed space abnormally increases, the pressure in the abnormally increased closed space can be released by the relief valve and maintained at a predetermined supply pressure. Safety can be improved with a simple configuration.
In addition, since the abnormal pressure release part is arranged between the relief valve and the heating part in the upstream side liquid supply passage, if the relief valve is clogged with water, etc. Even if the above double failure occurs, the abnormally increased pressure in the enclosed space can be reliably released from the abnormal pressure release portion, and the safety can be further improved. . Note that the predetermined supply pressure at which the relief valve operates is set to a pressure lower than the pressure that has abnormally increased when the abnormal pressure release portion releases the pressure.

  A further characteristic configuration of the beverage extractor according to the present invention is a pressure valve configured to open when the pressure from the primary side becomes equal to or higher than a predetermined discharge pressure on the extraction unit side of the downstream liquid supply path. Is located.

  According to the above characteristic configuration, the pressure valve configured to open when the pressure from the primary side becomes equal to or higher than the predetermined discharge pressure is disposed on the extraction unit side of the downstream liquid supply path. Even if the double failure occurs and the pressure in the closed space is released from the abnormal pressure release portion in the upstream liquid supply path, the pressure valve in the closed state causes the downstream liquid supply path and The pressure in the heating part is not released, and the high-temperature liquid existing in the heating part or in the downstream liquid supply path is not ejected from the abnormal pressure release part. Thereby, it is possible to satisfactorily prevent high-temperature liquid from being ejected from the abnormal pressure release portion, and safety can be further improved with a simple configuration.

According to a further characteristic configuration of the beverage extractor according to the present invention, the liquid feeding path is constituted by a flexible tube through which liquid can flow.
The abnormal pressure release portion is a downstream portion of the downstream liquid supply passage, wherein at least part of the thickness between the liquid supply pump and the heating portion in the upstream tube constituting the upstream liquid supply passage is formed. It is in the point formed by making it thinner than the wall thickness of a side tube.

  According to the above characteristic configuration, when the double fault occurs and the pressure in the enclosed space abnormally increases in the liquid supply path configured by a flexible tube through which liquid can flow, The abnormal pressure release portion provided at least at a part of the upstream tube between the liquid feed pump and the heating unit can be ruptured and broken earlier than the downstream tube. In particular, the abnormal pressure release portion can have a very simple configuration in which a portion having a thickness smaller than that of the downstream tube is provided on at least a part of the upstream tube. Thereby, the ejection location of the liquid ejected from the abnormal pressure release part can be specified with a simple configuration, and the safety can be further improved.

Perspective view of coffee maker Perspective view of coffee maker with lid open Partially exploded perspective view of the coffee maker with the pod holder and spout member detached with the lid open Coffee maker longitudinal left side view Block diagram showing the control configuration of the coffee maker Vertical left side view of the periphery of the extraction unit with the lid closed and the pod holder and spout member attached The figure explaining the effect | action of a lid lock mechanism

Hereinafter, an embodiment in the case where the present invention is applied to a coffee maker as an example of a beverage extractor will be described based on the drawings.
As shown in FIGS. 1 to 4, the coffee maker has an apparatus main body 1 (an example of the main body), and a water storage tank 8 (an example of a liquid) that is detachable from the apparatus main body 1 (an example of a storage tank). It is configured with. As shown in FIGS. 2 to 4, the apparatus main body 1 opens and closes an extraction unit base 50 that forms an extraction chamber 3 into which coffee powder (an example of a material to be extracted) Q is charged and an opening 4 of the extraction chamber 3. Extraction unit 2 having a flexible lid 5, a liquid supply path 6 that communicates between the tank 8 and the extraction unit 2, and a liquid supply path that is provided in the liquid supply path 6 and pressurizes water stored in the tank 8. A pump (an example of a liquid feed pump) 11 supplied to the extraction unit 2 via 6, a water heater (heating unit) that is disposed on the downstream side of the pump 11 in the liquid supply path 6 and heats the water supplied to the extraction unit 2 An example) 12, and a locked state (see FIG. 7A) that holds the lid 5 in a closed position (see FIGS. 1 and 4) that closes the opening 4, and a released state that releases the locked state (see FIG. A lid lock mechanism L (see FIG. 7) and the like that can be switched to those shown in FIG. 7 (b) are assembled.

As shown in FIG. 2, the coffee maker of this embodiment has a configuration in which a so-called cafe pod M in which coffee powder Q, which is ground coffee beans, is enclosed in a bag-like filter paper, is charged into the extraction unit 2. ing. Incidentally, the coffee pod M contains, for example, an amount of coffee powder Q necessary for extracting a cup of coffee.
Although details will be described later, as shown in FIGS. 2, 4, and 6, the cafe pod M is detachably attached to the extraction chamber 3 of the extraction unit 2 through the opening 4 and is filled with coffee powder Q. A pod holder H (an example of a material receiving portion) is placed in the extraction unit 2 through the opening 4 so as to be detachable.

As shown in FIGS. 1 to 4, the apparatus main body 1 includes an extraction unit 2 that protrudes forward from the front upper part and protrudes forward from the front lower part in a state of facing the extraction part 2 in the vertical direction. The outer shell is covered with the outer shell member 10 in a shape having a container mounting base 9 and a recess capable of mounting the tank 8 at the rear, and a storage space 7 (see FIG. 4) is formed inside the outer shell member 10. Has been.
Although details will be described later, the extraction unit 2 is configured such that a spout member 30 including a spout 33 can be removably mounted.
Then, when the cafe pod M is inserted into the extraction unit 2, the lid locking mechanism L is switched to the locked state with the lid 5 positioned at the closed position, and the water heater 12 and the pump 11 are appropriately operated. Hot water is supplied under pressure to the extraction unit 2 to extract coffee, and coffee is poured from the spout 33 of the spout member 30 into a coffee cup (not shown) placed on the container platform 9.
In the following description, each direction is defined with the direction in which the extraction unit 2 protrudes in the state where the coffee maker is placed on a horizontal table. That is, the direction opposite to the protruding direction of the extraction unit 2 is defined as the rear, and the left-right direction is defined in front view.

Next, each part of the coffee maker will be described in detail.
As shown in FIGS. 4 and 5, in this embodiment, in the storage space 7 of the apparatus main body 1, the liquid supply path 6 that connects the tank 8 and the extraction unit 2, and the water in the tank 8 is the extraction unit 2. And a water heater 12 that temporarily stores and heats water.
The pump 11 is composed of a known liquid feed pump, and is configured to function as a check valve that can deliver liquid from the upstream side to the downstream side and cannot flow liquid from the downstream side to the upstream side. .
The water heater 12 is configured by providing an electric heater 14 including a sheathed heater in a cylindrical heating container 13 that can store water and is closed up and down, and heats the water in the heating container 13 by the electric heater 14. It has become. The upper surface of the heating container 13 is provided with an outlet 13b connected to a downstream tube (an example of a downstream liquid feeding path) 6B described later, and an upstream tube (an example of an upstream liquid feeding path) described later on the lower surface. ) It has an inlet 13a connected to 6A. Incidentally, the capacity of the heating container 13 is, for example, about 350 cc.
The water heater 12 is provided with a hot water temperature sensor 15 that detects the temperature of the hot water in the heating container 13. When the temperature detected by the hot water temperature sensor 15 reaches a target heating temperature, the control unit 24 described later reaches the electric heater 14. It is comprised so that the operation | movement of may be stopped. Further, the water heater 12 is provided with a thermostat (an example of a safety device) 16 that detects the temperature of the outer surface of the heating container 13 and forcibly stops the operation of the electric heater 14 based on the detected temperature. .
The tank 8 is mounted in an inverted state on a tank receiver 17 provided in the apparatus main body 1, and water flows down from the outlet of the tank 8 to the tank receiver 17 as water is sent from the tank receiver 17. It has become.

As shown in FIGS. 4 and 5, the liquid supply path 6 is connected to the tank receiver 17 and a disk-shaped pressing portion 70 (see FIGS. 4 and 6) provided on the inner lid 66 of the lid 5. The tank 8 and the extraction unit 2 are communicated with each other in the state, and are provided in the apparatus main body 1. The liquid supply path 6 has a positive displacement sensor 19 for detecting the flow rate of water flowing through the liquid supply path 6 from the upstream side to the downstream side, a pump 11, and a primary side (inflow side from the pump 11). When the pressure of the relief valve 20, the hot water boiling portion 12, and the primary side (inflow side from the hot water heating portion 12) configured to maintain the pressure of the pressure below a predetermined set supply pressure becomes higher than a predetermined set discharge pressure, the valve opens. A pressure valve 21 configured as described above is provided. Incidentally, the set discharge pressure of the pressure valve 21 is a pressure corresponding to the saturated vapor pressure of water at a temperature higher than 100 ° C. (for example, 106 ° C.) (for example, 0.5 pressure which is suitable for extraction of plain coffee). ~ About 4 atmospheres (gauge pressure)).
A reflux port of the relief valve 20 and the tank receiver 17 are connected by a reflux path 22. When the pressure of the water flowing into the relief valve 20 exceeds the set supply pressure, a part of the introduced water is returned to the tank receiver 17 through the reflux path 22 so that the pressure of the water flowing into the relief valve 20 is set. It is configured to be maintained below the supply pressure. The reflux path 22 is also formed of a flexible and heat-resistant tube through which water can flow, similarly to the liquid feed path 6 described later.

The liquid supply path 6 is composed of a flexible and heat-resistant tube through which water can flow, and an upstream tube 6A that connects the tank 8 and the water heater 12, the water heater 12, and the extractor 2. A downstream tube 6B that communicates with the tank 8 and the upstream tube 6A that communicates with the tank 8 and an inlet 13a provided at the lower portion of the water heater 12, and the downstream tube 6B is provided at the upper portion of the water heater 12. The outlet 13b and the extraction unit 2 are configured to communicate with each other. In addition, the inflow port 13a opens toward the lower side of the coffee maker, and the outflow port 13b is configured to open toward the upper side of the coffee maker.
The upstream side tube 6A includes a first upstream side tube 6a that communicates between the tank 8 and the flow rate sensor 19, a second upstream side tube 6b that communicates between the flow rate sensor 19 and the pump 11, and a pump 11 and a relief valve 20. And a fourth upstream tube 6d that communicates between the relief valve 20 and the inlet 13a of the water heater 12.
The thickness t2 of the first to third upstream tubes 6a, 6b, 6c is formed to be the same thickness as the thickness t2 of the downstream tube 6B, and the thickness t1 of the fourth upstream tube 6d is the first thickness t1. To the third upstream tubes 6a, 6b, 6c and the downstream tube 6B are formed thinner than the wall thickness t2 (see FIG. 5). Specifically, in the present embodiment, the fourth upstream tube 6d has a wall thickness t1 of 1.5 mm over its entire length, and the first to third upstream tubes 6a, 6b, 6c, the reflux path 22 are formed. The downstream tube 6B is formed with a thickness t2 of 2 mm over the entire length thereof. Although the inner diameter of the first upstream tube 6a is slightly larger, the inner diameters of the other second to fourth upstream tubes 6b to 6d, the reflux path 22 and the downstream tube 6B are all the same. The inner diameter is configured. Accordingly, when the pressure in the upstream tube 6A and the downstream tube 6B in the closed space both rises abnormally, the fourth upstream tube 6d in the upstream tube 6A is more than the downstream tube 6B. It is configured to burst or break early. That is, the fourth upstream tube 6d is configured as an abnormal pressure release portion X that releases the pressure when the pressure in the liquid supply path 6 abnormally increases.

  As shown in FIG. 4, the apparatus main body 1 is configured by assembling the outer member 10 on a base 85. The outer member 10 includes an extraction unit base 50 that surrounds the upper front portion of the storage space 7, a front enclosure member 100 that surrounds the front and lower sides of the storage space 7, and both the left and right sides, the rear, and the upper side of the storage space 7. The rear side surrounding member 80 surrounding the rear side portion is assembled. Incidentally, the extraction part base | substrate 50, the front side surrounding member 100, the back side surrounding member 80, and the base part 85 which comprise the outer shell member 10 are formed by the molding process of a synthetic resin.

As shown in FIG. 4, a frame 23 formed by forming a metal plate material in a substantially U shape in a side view is erected in the storage space 7 of the outer member 10 of the apparatus body 1. The water heater 12 and the flow rate sensor 19 are supported by the frame 23 in a state of being positioned in the frame 23. Specifically, the frame 23 includes, for example, a wall-like front side vertical wall portion 71 extending in the vertical and horizontal directions, a bottom wall portion 72 and a bottom wall portion 72 extending rearward from the lower end portion of the front side vertical wall portion 71. A rear vertical wall portion 73 extending upward from the rear end portion is provided, and both side surfaces of the water heater 12 are connected to the front vertical wall portion 71 and the rear vertical wall portion 73 via connecting members (not shown). And provided between the front vertical wall portion 71 and the rear vertical wall portion 73.
Therefore, the inlet 13a at the lower part of the heating container 13 of the water heater 12 and the fourth upstream tube 6d connected to the inlet 13a are connected to the extraction unit base 50 constituting the outer member 10 in the storage space 7 and the front side. The side enclosure member 100, the rear side enclosure member 80 and the base 85, and the front side vertical wall part 71, the bottom wall part 72, and the rear side vertical wall part 73 constituting the frame 23 are enclosed. Even if the fourth upstream tube 6d is ruptured or damaged and hot water is ejected, the hot water is ejected downward, and the storage space is reliably surrounded by the outer member 10 and the frame 23 as described above. 7 is ejected into the interior of the storage space 7 and can be prevented from being ejected outside the storage space 7.

  As shown in FIG. 5, the coffee maker is provided with a control unit 24 that controls the operation. Further, as shown in FIG. 1, an operation unit 25 that transmits operation control information to the control unit 24 includes an apparatus main body 1. Is provided on the upper surface of the.

Next, the extraction unit 2 will be described. As shown in FIGS. 2 to 4, the front side surrounding member 100 that surrounds the front and lower sides of the storage space 7 extends rearward from the front wall portion 110 that surrounds the front of the storage space 7 and the lower end of the front wall portion 110. The storage space bottom portion 120 that covers the lower portion of the storage space 7 and the lower cover portion 130 that projects forward from the upper end of the front wall portion 110 and covers the lower portion of the extraction portion 2 are configured.
As shown in FIGS. 1 to 4, an insertion / removal port 131 for inserting / removing the spout member 30 is formed in the lower cover portion 130 so as to open from the front surface to the bottom surface.
As shown in FIGS. 3 and 4, the spout member 30 is configured in a substantially box shape having a receiving opening 31, and the insertion / removal port is in a posture in which the opening edge of the receiving opening 31 is aligned in the horizontal direction. 131 is inserted into the lower cover 130 through 131 and mounted.
A cracked cylindrical portion 34 having a slit extending over the entire length in the axial direction is erected on the distal end side of the bottom surface 32 of the spout member 30, and a cylindrical spout 33 is disposed on the proximal end side of the bottom surface 32. The bottom surface 32 (including the bottom surface in the cracked cylindrical portion 34) is provided as a front downward inclined surface that is inclined downward from the cracked cylindrical portion 34 side toward the spout 33 side. Is formed. In addition, the slit of the broken cylindrical part 34 is formed so that it may open toward the base end side, ie, the pouring spout 33 side.

  As shown in FIGS. 2, 3, and 6, the extraction unit base 50 is provided with a depression 53 that is recessed downward and has a through hole 54 that penetrates downward in the center of the bottom. Furthermore, on both the left and right sides of the recess opening 55 of the recess 53 on the upper surface of the extraction unit base 50, there are provided protrusions 56 that protrude upward and are long in the front-rear direction (FIGS. 2, 4, and 7). Reference), a rearward recess 57 that is recessed rearward is provided on the front end face of each protrusion 56.

  As shown in FIGS. 3 and 6, the pod holder H has a generally bowl-shaped holder body in which an outer cylindrical portion (an example of a receiving portion side cylindrical portion) 41 having an extraction hole 47 h is formed at the center of the bottom portion. 40, and a pod receiving member 48 formed with an inner cylindrical portion 48p at the center and mounted in the holder main body 40. The tip of the outer cylindrical portion 41 of the holder main body 40 (inside the outer cylindrical portion 41). An extraction hole member 47 in which a minute extraction hole 47 h is formed is fitted into the lower side of the fitted inner cylindrical part 48 p), and a net 49 is fitted into the inner cylindrical part 48 p of the pod receiving member 48. It is.

The holder main body 40 can be dropped and attached to the depression 53 through the depression opening 55 of the depression 53 of the extraction unit base 50, and has a generally bowl-like shape provided with a bowl-shaped portion 43 extending over the entire circumference. It is configured.
As shown in FIG. 6, the pod holder H formed by assembling the holder main body 40, the extraction hole member 47, the pod receiving member 48, and the net-like body 49 as described above is the depression 53 of the extraction unit base 50. The cafe pod M is mounted on the pod holder H in a state where it is mounted on the pod receiving member 48. That is, the inside of the hollow portion 53 of the extraction portion base 50 is configured in the extraction chamber 3 of the extraction portion 2 that houses the pod holder H, and the hollow opening portion 55 of the hollow portion 53 functions as the opening portion 4 of the extraction portion 2. It is configured as follows.

Further, as shown in FIG. 3, a knob 44 protruding outward in the radial direction and a positioning blade 45 are provided on the outer peripheral side of the bowl-shaped portion 43 of the holder body 40 in a state shifted in the circumferential direction. ing. Incidentally, the proper orientation of the holder main body 40, that is, the pod holder H, to be mounted in the hollow portion 53 of the extraction portion base 50 is a posture in which the knob portion 44 faces the front side.
Further, on the upper surface of the extraction unit base 50, positioning recesses 58A and 58B into which the knob 44 and the positioning blade 45 of the pod holder H enter when the pod holder H is mounted in the recess 53 in an appropriate orientation. Is provided.
When the spout member 30 is mounted in the lower cover member 130 through the insertion / removal port 131 and the pod holder H is mounted in the recess 53 in an appropriate direction, as shown in FIG. The tip is in a state of entering the upper part of the cracked cylindrical portion 34 of the spout member 30. Then, the coffee extracted from the cafe pod M placed on the pod holder H is ejected from the minute extraction hole 47 h of the extraction hole member 47 into the cracked cylindrical portion 34 of the spout member 30 and to the bottom surface 32 thereof. Collisions and bubbles, so-called crema, stand. The coffee with such a crema passes through the slit of the cracked cylindrical portion 34, further flows down the bottom surface 32 of the spout member 30, drops from the spout 33, and is poured into the coffee cup.
That is, the extraction unit 2 is configured to include the extraction unit base 50 provided with the depression 53, the lower cover 130 of the front surrounding member 100, the spout member 30, and the like.

Next, the lid 5 will be described.
As shown in FIG. 2 to FIG. 4 and FIG. 6, the lid 5 is configured by assembling each member below a generally domed lid upper plate 62 that covers the lid 5.
In the portion of the lid 5 facing the upper surface of the extraction unit base 50, the holder opening of the holder main body 40 in the pod holder H mounted in the recess 53 of the extraction unit base 50 when the lid 5 is located at the closed position. An inner lid 66 is provided so as to close the portion 42. The inner lid 66 is provided with a disk-shaped pressing portion 70 provided with a plurality (five in this embodiment) of gates 64 h at equal intervals in the circumferential direction so as to face the extraction unit base 50. The pressing portion 70 is fixed by screws (not shown). In addition, each of the plurality of gates 64h is provided in a projection part in which the pressing portion 70 is partially protruded toward the extraction unit base 50 in correspondence with each gate, and although not illustrated, the gate 64h in the pressing unit 70 is provided. Inside each of the plurality of protrusions provided, protrusions not provided with the gate 64h are provided. On the back side of the pressing portion 70 in the inner lid 66, the pressure valve 21 is provided with its discharge port (not shown) connected to a space (not shown) between the inner lid 66 and the pressing portion 70, Further, an annular hermetic seal member 65 is provided on the outer peripheral portion of the pressing portion 70 on the surface of the inner lid 66 facing the extraction portion base 50.

Then, as shown in FIG. 6, when the lid body 5 is positioned at the closed position, the inner lid 66 and the holder opening portion 42 of the holder body 40 in the pod holder H are sealed by the sealing seal member 65 on the outer peripheral portion of the pressing portion 70. The opening 4 of the extraction unit 2 is closed by the lid 5 in a state in which the space between the pressing unit 70 and the holder opening 42 is sealed.
When hot water is ejected from the pressure valve 21, the ejected hot water is ejected from the gate 64 h of the pressing portion 70 to the cafe pod M in the extraction chamber 3.

  As shown in FIG. 4, the downstream tube 6 </ b> B connecting the boiling water portion 12 and the pressing portion 70 in the liquid supply path 6 is configured by a heat-resistant liquid supply tube having flexibility, and the lid 5 is swung. Is connected to the water heater 12 and the pressure valve 21 with a slack.

Next, the lid lock mechanism L will be described.
As shown in FIGS. 4, 6, and 7, in the internal space of the lid 5, the slide member 67 faces the opening 4 of the extraction unit 2 when the lid 5 is in the closed position. (I.e., substantially parallel to the upper surface of the extraction unit base 50) and reciprocally movable in a direction perpendicular to the swing axis A1 of the lid 5 (that is, the front-rear direction of the lid 5). ing. The lid 5 is configured to be swingable around the swing axis A1.
As shown in FIG. 7, the slide member 67 includes a rearward recessed portion of each of the pair of protrusions 56 of the extraction unit base 50 as the slide member 67 reciprocates in a state where the lid 5 is located at the closed position. A pair of lateral projections 67p projecting in the left-right direction to be engaged and disengaged from 57 and a pair of connection holes 67h for connecting an opening / closing operation lever 68 for sliding the slide member 67 are provided.

  The pair of lateral protrusions 67p and the pair of protrusions 56 are provided in the following relative positional relationship. That is, in the state where the lid 5 is located at the closed position, as shown in FIG. 7A, when the slide member 67 is located at the engagement position at the rear end in the reciprocating range in the front-rear direction, each lateral projection As shown in FIG. 7 (b), the disengagement position of the front end of the slide member 67 in the reciprocating movement range in the front-rear direction is obtained. Each of the laterally protruding portions 67p is disengaged from the rearwardly recessed portion 57 of each of the projecting ridges 56 when in the disengaged state.

As shown in FIGS. 1 and 4, the lid upper plate 62 is provided with an opening for placing the opening / closing operation lever 68. As shown in FIG. The rear end portion is provided on the lid body 5 so as to be swingable around the axis A2 in the left-right direction.
As shown in FIG. 7, the opening / closing operation lever 68 is provided with a pair of arm portions 68 a that are distributed in the left-right direction, and the respective ends of the pair of arm portions 68 a are respectively connected to the pair of connection holes 67 h of the slide member 67. It is connected in a state of fitting.
Then, the opening / closing operation lever 68 and the slide member 67 are tilted in a state in which the opening / closing operation lever 68 swings forward (see FIG. 7A) in a state where the lid 5 is in the closed position ( When the upper surface of the opening / closing operation lever 68 is flush with the upper surface of the lid upper plate 62, the slide member 67 is located at the engagement position at the rear end of the reciprocating movement range, and as shown in FIG. When the 68 swings backward and assumes a standing posture, the slide member 67 is connected so as to be positioned at the engagement release position at the front end of the reciprocating movement range.

  Therefore, when the lid 5 is positioned at the closed position, the opening / closing operation lever 68 is tilted forward by swinging into the tilted position and the slide member 67 is positioned at the engagement position, so that the pair of lateral protrusions 67p are respectively provided. Are engaged with the rearward concave portions 57 of the pair of protrusions 56, the lid body 5 is held in the closed position, and the lid lock mechanism L is switched to the locked state. Further, when the lid locking mechanism L is in the locked state as described above, when the open / close operation lever 68 is stood up by swinging backward and the slide member 67 is positioned at the disengagement position, a pair of Each of the lateral projections 67p is detached from each of the rearward recesses 57 of the pair of protrusions 56, the state where the lid 5 is held in the closed position is released, and the lid lock mechanism L is switched to the release state.

  That is, in this embodiment, the lid locking mechanism L includes the slide member 67, the opening / closing operation lever 68 for moving the slide member 67, and the rearward recessed portion 57 provided on each of the pair of protrusions 56 of the extraction unit base 50. And a pair of lateral projections 67p provided on the slide member 67.

  The control unit 24 is configured by a microcomputer, and receives control information from the operation unit 25 and detection information of sensors such as the hot water temperature sensor 15, the thermostat 16, and the flow rate sensor 19, and the control information and detection. Based on the input information, the operation and stop of the pump 11 and the electric heater 14 of the water heater 12 are controlled.

Although not shown, the operation unit 25 includes a power switch for enabling the coffee maker to operate, a water filling switch for instructing a water filling operation, an extraction switch for instructing a coffee extraction operation, and the like. . Further, the slide member 67 is turned on as the slide member 67 is located at the engagement position (that is, the lid lock mechanism L is switched to the lock state), and moves forward from the engagement position (ie, the lid lock mechanism L is released). A micro switch is provided that turns off as it is switched.
The water filling operation is an operation for filling the heating container 13 of the water heater 12 with water, and is executed when the coffee maker is used for the first time. The extraction operation is an operation for extracting an amount of coffee corresponding to one cup of coffee.
In advance, in the extraction operation, the target delivery amount for extracting hot water by the pump 11, the target heating temperature for heating the water in the hot water boiling unit 12 (the target temperature detected by the hot water temperature sensor 15), and the water filling operation The filling target delivery amount for delivering water by the pump 11 is set, and the extraction target delivery amount, the target heating temperature, and the filling target delivery amount are stored in a memory (not shown) of the control unit. Incidentally, in this embodiment, the extraction target delivery amount is set to 130 cc, for example, and the target heating temperature is set to a range of 85 to 93 ° C. (for example, 89 ° C.). Further, the target delivery amount for filling is set to an amount slightly larger than the capacity of hot water filled in the liquid feeding path 6 from the outlet of the tank 8 to the pressure valve 21.

  When the water filling switch is pressed while the micro switch is on, the control unit 24 starts the operation of the pump 11 to start the water filling operation, and thereafter the flow rate detected by the flow rate sensor 19 is changed. When the integrated flow rate reaches the target delivery amount for filling, the operation of the pump 11 is stopped and the water filling operation is terminated.

The control unit 24 is configured to start the extraction operation when the extraction switch is pressed while the micro switch is on, and not to start the extraction operation even when the extraction switch is pressed when the micro switch is off. ing. The extraction operation is performed on the premise that the heating container 13 of the water heater 12 is filled with water. For example, when performing the extraction operation for the first time, the water filling operation is executed before that.
When the extraction switch is pressed while the microswitch is on, the control unit 24 operates the electric heater 14 to start the extraction operation. In the extraction operation, the temperature detected by the hot water temperature sensor 15 is the target heating. When the temperature is reached, the operation of the electric heater 14 is stopped and the operation of the pump 11 is started. Thereafter, the flow rate detected by the flow rate sensor 19 is integrated, and when the integrated flow rate reaches the extraction target delivery amount. The operation of the pump 11 is stopped and the extraction operation is terminated.

Next, representative examples (1) to (5) in which the abnormal pressure release portion X operates during the operation of the coffee maker (particularly during the extraction operation) will be described. These representative examples are examples, and other than these representative examples. In some cases, the abnormal pressure release portion X may operate.
In the coffee maker, impurities such as dust contained in the water flowing through the liquid supply path 6, for example, water stains generated in the heating container 13 of the water heater 12 and the liquid supply path 6, etc. 6A and the downstream tube 6B, in particular, water residue or the like easily accumulates on the downstream tube 6B, and there is a possibility that the liquid supply path 6 may be blocked at these locations. If at least the downstream tube 6B in the liquid feeding path 6 is closed, the pump 11 disposed on the upstream side of the water heater 12 normally allows only a flow from the upstream side to the downstream side. Therefore, a space between the closed portion of the downstream tube 6B and the pump 11 is a closed space. Similarly, when the upstream side tube 6A (downstream side of the pump 11) and the downstream side tube 6B are simultaneously closed for some reason, the downstream side tube 6B is also closed between the closed side and the upstream side tube 6A. It becomes space.

(1) The downstream tube 6B is blocked, the fourth upstream tube 6d is blocked or the relief valve 20 is broken (flow to the reflux path 22 is blocked), and the hot water temperature sensor 15 and the thermostat 16 are broken. In the case of double failure (including failure of the control unit 24) In this case, a closed space is formed between the closed location of the downstream tube 6B and the closed location of the fourth upstream tube 6d or the pump 11. For this reason, if the hot water temperature sensor 15 and the thermostat 16 fail and the electric heater 14 of the water heater 12 continues to operate, the closed space is in a high temperature and high pressure state in which the temperature and pressure are abnormally increased as compared with normal extraction operation. . If the heating by the electric heater 14 continues as it is, the thickness of the fourth upstream tube 6d as the abnormal pressure release portion X is formed thinner than the thickness of the downstream tube 6B in the closed space. The fourth upstream side tube 6d is ruptured or broken earlier than 6B, and can be released from the abnormal pressure release portion X that is assumed as a location where the pressure in the closed space is jetted in advance. In the representative example (1), instead of the downstream tube 6B being closed, the abnormal pressure release portion is similarly applied in the case of a double failure in which the pressure valve 21 has failed (the flow to the extraction unit 2 is blocked). The fourth upstream tube 6d as X can be ruptured or broken earlier than the downstream tube 6B.

(2) The downstream tube 6B is blocked, the relief valve 20 is broken (the flow to the reflux path 22 is blocked), and the pump 11 is broken (including the failure of the control unit 24 and the flow sensor 19). In the case of double failure In this case, since a closed space is formed between the closed portion of the downstream tube 6B and the pump 11, if the pump 11 fails and the pump 11 continues to operate, Becomes a high pressure state in which the pressure is abnormally increased as compared with the normal extraction operation. If the pressurization by the pump 11 is continued as it is, the thickness of the fourth upstream tube 6d as the abnormal pressure release portion X is formed thinner than the thickness of the downstream tube 6B in the closed space. The fourth upstream tube 6d is ruptured or damaged earlier than the downstream tube 6B, and can be released from the abnormal pressure release portion X that is assumed as a location where the pressure in the closed space is ejected in advance.

(3) The downstream tube 6B is blocked, the third upstream tube 6c is blocked and the relief valve 20 is broken (the flow to the reflux path 22 is blocked), and the hot water temperature sensor 15 and the thermostat 16 are broken. In the case of double failure (including failure of the control unit 24) In this case, a closed space is formed between the closed location of the downstream tube 6B and the closed location of the third upstream tube 6c. If the temperature sensor 15 and the thermostat 16 break down and the electric heater 14 of the water heater 12 continues to operate, the closed space becomes a high temperature and high pressure state in which the temperature and pressure are abnormally increased as compared with the normal extraction operation. If the heating by the electric heater 14 continues as it is, the thickness of the fourth upstream tube 6d as the abnormal pressure release portion X is formed thinner than the thickness of the downstream tube 6B and the third upstream tube 6c in the closed space. Therefore, the abnormal pressure release portion X is assumed as a place where the fourth upstream tube 6d is ruptured or damaged earlier than the downstream tube 6B and the third upstream tube 6c, and the pressure in the closed space is preliminarily ejected. Can be released from.

(4) In the case of a double failure in which the downstream side tube 6B is blocked, the reflux path 22 is blocked, and the hot water temperature sensor 15 and the thermostat 16 are broken (including the failure of the control unit 24). Since a closed space is formed between the closed portion of the downstream tube 6B, the closed portion of the reflux path 22, and the pump 11, the hot water temperature sensor 15 and the thermostat 16 break down, and the electric heater 14 of the water heater 12 operates. If it continues, the enclosed space will be in the high temperature and high pressure state in which temperature and pressure rose abnormally compared with the normal extraction operation. If the heating by the electric heater 14 continues as it is, the thickness of the fourth upstream tube 6d as the abnormal pressure release portion X is larger than the thickness of the downstream tube 6B, the reflux path 22 and the third upstream tube 6c in the closed space. Since the fourth upstream tube 6d is ruptured or damaged earlier than the downstream tube 6B, the reflux path 22, and the third upstream tube 6c, the pressure in the closed space is preliminarily ejected. It is possible to release from the abnormal pressure release part X assumed as.

(5) In the case of a double failure in which the downstream side tube 6B is closed and the return path 22 is closed, and the pump 11 has failed (including the failure of the control unit 24 and the flow sensor 19). Since a closed space is formed between the closed portion of the side tube 6B, the closed portion of the reflux path 22, and the pump 11, if the pump 11 fails and the pump 11 continues to operate, the normal operation in the closed space is performed. It becomes a high pressure state in which the pressure is abnormally increased. If the pressurization by the pump 11 is continued as it is, the thickness of the fourth upstream tube 6d as the abnormal pressure release portion X is reduced in the downstream tube 6B, the reflux path 22 and the third upstream tube 6c in the closed space. Since it is formed thinner than the wall thickness, the fourth upstream side tube 6d is ruptured or damaged earlier than the downstream side tube 6B, the reflux path 22 and the third upstream side tube 6c, and the pressure in the closed space is preliminarily set. It can release from the abnormal pressure release part X assumed as a location to eject.

As described above, in the case of the double failure of (1) to (5), the abnormally increased pressure in the enclosed space can be released from the abnormal pressure release portion X, and hot water is ejected when the abnormal pressure is released. Can be generated at a specific location (abnormal pressure release portion X) in the storage space 7 of the apparatus main body 1.
Further, since the abnormal pressure release portion X is disposed between the relief valve 20 and the hot water boiling portion 12 in the upstream side tube 6A, the pressure in the closed space rises abnormally, and hot water is ejected from the abnormal pressure release portion X. After that, even if the pump 11 continues to operate, the hot water ejected from the abnormal pressure release portion X is a relatively low temperature hot water that is mainly supplied from the tank 8 and heated by the hot water boiling portion 12. Therefore, it is possible to reduce the influence on people, devices, etc. existing around the coffee maker.
Furthermore, the 4th upstream tube 6d (abnormal pressure) of the upstream tube 6A located in the lower part of the hot water part 12 is earlier than the downstream tube 6B which connects the outflow port 13b of the upper part of the hot water part 12 and the extraction part 2. The pressure is released from the open portion X), and hot water can be preferentially ejected from the lower portion of the water heater 12 while preventing hot water from being ejected from the upper portion of the water heater 12. As a result, even if the fourth upstream tube 6d is ruptured or damaged and hot water is ejected, the hot water is ejected to the lower side of the boiling portion 12 and is reliably surrounded by the outer member 10 and the frame 23 as described above. It will be ejected into the storage space 7 thus made, and the scattering of hot water ejected from the abnormal pressure release portion X can be effectively and simply prevented. Therefore, it is possible to prevent the hot water from splashing from the upper part of the coffee maker and causing unexpected damage to surrounding people and devices.

Further, even if the double fault occurs and the pressure in the closed space abnormally increases, the pressure in the abnormally increased closed space can be released by the relief valve 20 and maintained at a predetermined supply pressure. Safety can be improved with a simple configuration.
In addition, if the relief valve 20 fails due to clogging of the relief valve 20 and abnormal pressure cannot be released to the reflux path 22, even if the double failure occurs, The abnormally increased pressure can be reliably released from the abnormal pressure release portion X, and the safety can be further improved. Note that the predetermined supply pressure at which the relief valve 20 operates is set to a pressure lower than the abnormally increased pressure when the abnormal pressure release portion X releases the pressure.

  Furthermore, even if the double fault occurs and the pressure in the closed space is released from the abnormal pressure release portion X in the upstream tube 6A, the downstream tube is closed by the pressure valve 21 in the closed state. The pressure in 6B and the water heater 12 is not released, and the hot water existing in the water heater 12 or the downstream tube 6B is not ejected from the abnormal pressure release part X. Thereby, it is possible to satisfactorily prevent high-temperature hot water from being ejected from the abnormal pressure release portion X, and safety can be further improved with a simple configuration.

[Another embodiment]
(A) In the above embodiment, the abnormal pressure release portion X that releases the pressure when the pressure in the liquid supply path 6 abnormally rises is disposed between the relief valve 20 and the water heater 12 in the upstream side tube 6A. However, the installation location and configuration of the abnormal pressure release portion X is disposed between the pump 11 and the boiling water portion 12 in the upstream tube 6A, and the pressure in the liquid supply path 6 is abnormal. Any configuration that can release the pressure when it rises can be changed as appropriate.

(A-1) For example, the abnormal pressure release portion X may be provided in one or both of the upstream tube 6A between the pump 11 and the relief valve 20 and between the relief valve 20 and the boiling water portion 12. it can. When the relief valve 20 is omitted, the abnormal pressure release portion X can be provided between the pump 11 and the water heater 12.

(A-2) For example, the abnormal pressure release portion X is not configured to make the thickness of the fourth upstream tube 6d out of the upstream tube 6A thinner than the thickness of the downstream tube 6B over its entire length. The thickness of a part or a plurality of portions of the upstream side tube 6d can be configured to be thinner than the thickness of the downstream side tube 6B.
In this case, when reducing the thickness, it is preferable to form a recess in one or both of the inner diameter and the outer diameter of the fourth upstream tube 6d. It should be noted that the extent to which the thickness of the tube constituting the abnormal pressure release portion X is reduced is higher than the pressure at which the relief valve 20 and the pressure valve 21 are opened, and the fourth upstream side constituting the abnormal pressure release portion X. The thickness can be appropriately set as long as the tube 6d is ruptured or broken.

(A-3) For example, the abnormal pressure release part X is not configured to make the wall thickness between the pump 11 and the kettle 12 of the upstream tube 6A thinner than the wall thickness of the downstream tube 6B, but the upstream tube. The connection strength of one or both of the connection portion between the pump 11 and the relief valve 20 and the connection portion between the relief valve 20 and the hot water heating portion 12 in 6A is determined by the connection strength of the hot water heating portion 12 and the pressure valve 21 in the downstream tube 6B. It can also be set as the structure weaker than connection strength. Specifically, for example, the upstream tube 6A and the downstream tube 6B are connected using the same tube to connect and fix the fourth upstream tube 6d of the upstream tube 6A and the inlet 13a of the water heater 12. By fixing the band (an example of the connecting member) with a fixing force (holding force) weaker than the fixing of the band for connecting and fixing the downstream tube 6B and the outlet 13b of the water heater 12, In the event of a failure, the former band can be separated (broken) earlier than the latter band. In this case, for example, by omitting the former band and fixing the connection only with the latter band, the connection between the fourth upstream side tube 4d and the inflow port 13a can be performed when the above-described double failure occurs. However, it can also be configured to be detached (broken) earlier than the connection between the downstream tube 6B and the outlet 13b.

(B) In the above embodiment, the tank 8 is configured to be detachable from the apparatus main body 1. However, the tank 8 may be configured to be fixed to the apparatus main body 1.

(C) In the above embodiment, the thermostat 16 that detects the temperature of the outer surface of the heating vessel 13 of the water heater 12 and forcibly stops the operation of the electric heater 14 based on the detected temperature is provided. Instead of or in addition to 16, a safety device such as a temperature fuse that melts and forcibly cuts off the electric heater 14 when a predetermined abnormal temperature is reached may be provided. Moreover, it can also be set as the structure which abbreviate | omits these safety devices.

(D) In the above embodiment, the water filling switch and the extraction switch are separately provided in the operation unit 25, but the water filling switch may be omitted. In this case, for example, after the coffee maker is shipped, after the power switch is pushed for the first time, the water filling operation is executed when the extraction switch is pushed for the first time, and thereafter the extraction operation is executed when the extraction switch is pushed. Configure as follows. That is, when the water filling operation is executed once, the water filling operation is performed only once when the coffee maker is used for the first time because the heating container 13 of the water heater 12 is filled with water during the subsequent extraction operation. It can also be configured to execute.

(E) In the above embodiment, the pod holder H is configured to include the holder main body 40 and the pod receiving member 48 separately, but may be configured as a single unit.
Further, in the above embodiment, the pod holder H is detachable in the extraction chamber 3, but the pod holder H may be fixed in the extraction chamber 3 with screws, or the pod holder H may be the extraction unit base. 50 may be integrated.

(F) In the above embodiment, the pressure valve 21 used has a set discharge pressure set to a pressure suitable for plain coffee extraction. For example, the set discharge pressure is suitable for extracting espresso coffee. You may use what was set to various pressures. Further, a pressure valve 21 that can change and set the set discharge pressure may be used, or a plurality of pressure valves 21 having different set discharge pressures may be replaced.
Further, the pressure valve 21 may be omitted.

(G) In the above embodiment, the coffee pod M in which the coffee powder Q is packed in the filter paper is placed on the pod holder H. However, the coffee powder Q may be placed on the pod holder H as it is. . Or it is good also as a structure which can use both the usage form which mounts the cafe pod M in the pod holder H, and the usage form which mounts the coffee powder Q in the pod holder H as it is.

(H) In the above embodiment, the case where the present invention is applied to a coffee maker that extracts coffee has been described. However, a specific example of a beverage extractor to which the present invention can be applied is not limited to a coffee maker. And various beverage extractors such as those for extracting tea.

  Note that the configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises. The embodiments disclosed in this specification are exemplifications, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

  As described above, even if a double failure occurs in the event that a closed space is formed on the upstream side and the downstream side of the heating unit in the liquid feeding path and the heating unit or the liquid feeding pump continues to operate, It is possible to provide a beverage extractor that can be generated at a location where a liquid supply path in a closed space is assumed to be ruptured or broken.

1 Main unit (main unit)
2 Extraction unit 4 Opening 5 Lid 6 Liquid feed path 6A Upstream tube (upstream liquid feed path)
6a First upstream tube (upstream tube)
6b Second upstream tube (upstream tube)
6c Third upstream tube (upstream tube)
6d 4th upstream side tube (upstream side tube, abnormal pressure release part)
6B Downstream tube (downstream liquid feed path)
7 Storage space 8 Tank (storage tank)
11 Pump (feed pump)
12 Water heater (heating unit)
20 Relief valve 21 Pressure valve 55 Recessed opening (opening)
Q coffee powder (material to be extracted)
X Abnormal pressure release part t1 Thickness (4th upstream tube)
t2 Wall thickness (downstream tube)

Claims (5)

A storage tank that stores liquid and an extraction unit that includes a lid that can open and close an opening for loading the material to be extracted are provided in the main body, and the storage tank and the extraction unit are disposed in a storage space of the main body. A liquid supply path that communicates with the liquid supply path, a liquid supply pump that is disposed in the liquid supply path and pressurizes the liquid stored in the storage tank and supplies the liquid to the extraction unit via the liquid supply path; A beverage extractor provided with a heating unit disposed on the downstream side of the liquid feed pump in the liquid channel and heating the liquid supplied to the extraction unit,
The liquid feeding path includes an upstream liquid feeding path that communicates the storage tank and the heating unit, and a downstream liquid feeding path that communicates the heating unit and the extraction unit,
Beverage extractor in which an abnormal pressure release section that releases pressure when the pressure in the liquid supply path abnormally increases is disposed between the liquid supply pump and the heating section in the upstream liquid supply path .   2. The beverage extractor according to claim 1, wherein the upstream liquid supply path communicates the storage tank and a lower part of the heating unit, and the downstream liquid supply path communicates an upper part of the heating unit and the extraction unit. . A relief valve configured to maintain a pressure from the primary side below a predetermined supply pressure is disposed between the liquid feeding pump and the heating unit in the upstream liquid feeding path,
The beverage extractor according to claim 1 or 2, wherein the abnormal pressure release unit is disposed between the relief valve and the heating unit in the upstream liquid supply path.   4. The pressure valve configured to open when the pressure from the primary side becomes equal to or higher than a predetermined discharge pressure is disposed on the extraction unit side of the downstream liquid supply path. The beverage extractor according to 1. The liquid supply path is configured by a flexible tube through which liquid can flow.
The abnormal pressure release portion is a downstream portion of the downstream liquid supply passage, wherein at least part of the thickness between the liquid supply pump and the heating portion in the upstream tube constituting the upstream liquid supply passage is formed. The beverage extractor according to any one of claims 1 to 4, wherein the beverage extractor is formed thinner than the thickness of the side tube.

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