JP2021134958A - Hot water generator - Google Patents

Abstract

To make a heat conductive material, such as a highly thermal conductive silicone compound, less likely to flow out from the upper side of a block heater.SOLUTION: A hot water generator 50 includes: a hot water tank 51 for heating water to generate hot water; a heater 54 which is provided at the lower side of the hot water tank 51 and heats water in the hot water tank 51 with its upper surface, i.e. a heating surface 55b; and a semisolid heat conductive material 57 which is disposed between the hot water tank 51 and the heater 54, transmits heat of the heater 54 to the hot water tank 51, and has fluidity. The heating surface 55b of the heater 54 is provided with a retaining recessed part 55c for retaining the semisolid heat conductive material 57.SELECTED DRAWING: Figure 7

Description

The present invention relates to a hot water generator that heats water to generate hot water.

Patent Document 1 discloses an invention of an electric water heater. This electric water heater includes a water storage container for heating water to generate hot water, a block heater that heats the inside of the water storage container by a heater wire embedded under the water storage container, and a water storage tank and a block. It is provided with a silicon rubber diffusion molded sheet that is interposed between the heater and transfers the heat of the block heater to the water storage container. In this electric water heater, when the heater wire embedded in the block heater is heated, the block heater heats the water in the water storage container via the silicon rubber diffusion molded sheet, and the water in the water storage container is heated to be hot water. It becomes (hot water).

Jikkai Sho 54-052744

The electric water heater of Patent Document 1 transfers the heat generated from the block heater to the water storage container via the silicon rubber diffusion molded sheet. If a heat transfer sheet such as a silicone rubber diffusion molded sheet is used to transfer the heat of the block heater to the water storage container, the heat transfer sheet may be deformed due to aged deterioration due to the heat of the block heater, and the heat transfer sheet Due to the deformation, a part of the heat of the block heater may be separated from the lower surface of the bottom of the water storage container, and the heat of the block heater may not be transferred to the bottom of the water storage tank as a whole. In addition, when the hot water in the water storage tank decreases and water is supplied, the water storage container heated by the block heater is cooled by the newly supplied water and contracts, separating it from the heat transfer sheet and heating the block heater. There was also a problem that it became difficult for the water to be transmitted to the water storage tank.

In this type of electric water heater, instead of a heat transfer sheet such as a silicon rubber diffusion molded sheet, a semi-solid heat conductive material having fluidity such as a heat conductive silicone compound is used to heat the heat of the block heater. In some cases, the heat is transmitted to the bottom of the water storage container as a whole through a conductive material. Since a heat conductive material such as this kind of heat conductive silicone compound has fluidity, the heat of the block heater can be transferred to the water storage container even if the water storage container is deformed due to expansion and contraction. However, a heat conductive material such as a heat conductive silicone compound softens due to repeated temperature changes and is easily pushed out from between the water storage container and the block heater, which expands and changes at high temperatures, so that the heat conductive material is easily pushed out from above the block heater. It is easy to flow out, and there is a risk that the heat of the block heater cannot be transferred to the water storage container. An object of the present invention is to prevent a semi-solid heat conductive material such as a highly heat conductive silicone compound from flowing out from above the heating surface of the heater.

In order to solve the above problems, the present invention includes a hot water tank for heating water to generate hot water, and a heater provided under the hot water tank and heating the water in the hot water tank by a heating surface on the upper surface. , A hot water generator with a semi-solid heat conductive material that is interposed between the hot water tank and the heater and has the fluidity to transfer the heat of the heater to the hot water tank, and is the heating surface of the heater. Provided is a hot water generator characterized in that a holding recess for holding a heat conductive material is provided in the above.

In the hot water generator configured as described above, a holding recess for holding the semi-solid heat conductive material is provided on the heating surface of the heater. The heat conductive material interposed between the hot water tank and the heater is continuously heated and softened by the heater, and is pushed out from the heating surface of the heater by the heat-expanding hot water tank and flows out from the heating surface of the heater. It's easier to do. However, since the heat conductive material is held on the heating surface of the heater by the holding recess, it is possible to prevent the heat conductive material from flowing out from the upper side of the heater.

In the hot water generator configured as described above, it is preferable that the holding recesses extend in the circumferential direction and have a groove shape in which a plurality of holding recesses are arranged in the radial direction. In this case, it is possible to prevent the heat conductive material from flowing out in the radial direction by a plurality of circumferentially extending groove-shaped holding recesses arranged in the radial direction of the heater. In this case, it is preferable that a plurality of groove-shaped holding recesses arranged in the radial direction are formed deeper than those arranged outside in the radial direction and those arranged in the central portion in the radial direction. In this case, the heat conductive material can be further prevented from flowing out by the holding recess formed deeply on the outer side in the radial direction of the heater.

In the hot water generator configured as described above, the heater has a through hole formed in the central portion in the radial direction, and a plurality of groove-shaped holding recesses arranged in the radial direction are arranged inside in the radial direction. It is preferable to form the thing deeper than the thing arranged in the central part in the radial direction. In this case, the heat conductive material can be prevented from flowing out from the through hole formed in the central portion in the radial direction by the holding recess formed deeply inside the heater in the radial direction.

In the hot water generator configured as described above, the heater is fastened and fixed to the bottom of the hot water tank at a plurality of fastening points in the circumferential direction by fastening members, and a holding recess is formed between the plurality of fastening points in the circumferential direction. It is preferable to do so. The heater is in close contact with the bottom of the hot water tank at a plurality of circumferential fastening points fastened by fastening members, whereas it is less likely to be brought into close contact with the bottom of the hot water tank than at the fastening points in the circumferential direction. ing. Since the holding recess is formed between the plurality of fastening points in the circumferential direction, the heater heats the hot water tank by the heat conductive material held by the holding recess even in the portion between the plurality of fastening points in the circumferential direction. It becomes easier to convey. As a result, the hot water tank can be prevented from being locally overheated at the fastening point of the heater, and is heated evenly in the circumferential direction.

It is a perspective view of the beverage feeder which adopted the hot water generator of this invention. It is a perspective view of the state which the front panel of FIG. 1 is removed. It is a vertical sectional view along the front-rear direction along the AA line. It is a schematic diagram which shows the state which the raw material water supply part is connected to the raw material water supply port formed in the base. It is a schematic diagram of a raw material water supply part. It is sectional drawing of the bottom of a hot water generator. It is a perspective view seen from diagonally above the heater block. It is a block diagram of a control device. It is a perspective view seen from diagonally above of the heater block which formed the holding recess between four fastening points.

Hereinafter, an embodiment of a beverage supply device using the hot water generator of the present invention will be described with reference to the drawings. The beverage supply device 10 using the hot water generator of the present invention supplies hot beverages such as hot water (hot water) or hot tea, or cold beverages such as cold water or tea into a container C such as a cup. be. As shown in FIGS. 1 to 3, the beverage supply device 10 has a substantially rectangular housing 11 in the front portion of a powder and hot water (hot water) and / or cold water (water) for producing a beverage such as tea. A beverage generation chamber 12 for mixing the above and a machine chamber 13 at the rear of the housing 11 are provided, and the inside of the housing 11 is divided into a beverage generation chamber 12 and a machine chamber 13 by a partition plate 14. The machine room 13 includes a hot water generator 50 that generates hot water (hot water) to be supplied to the mixing container 33 or the container C, which will be described later, a cooling water tank 41 for cooling the water to be supplied to the mixing container 33 or the container C, and cooling. A raw material water supply unit 40 provided with a refrigerating device (not shown) for cooling the water tank 41 is provided.

As shown in FIGS. 2 and 3, the beverage generation chamber 12 is provided with a mounting table 20 on which a container C such as a cup is placed, and a beverage supply unit 30 for supplying a beverage into the container C. In this embodiment, the beverage generation chamber 12 is provided with three beverage supply units 30 for supplying three types of beverages, and the three beverage supply units 30 have substantially the same configuration. In the following description, only one beverage supply unit 30 will be mainly described.

As shown in FIGS. 1 and 2, the mounting table 20 is arranged in the central portion in the left-right direction at the lower part of the beverage generation chamber 12. The mounting table 20 includes a pedestal portion 21 on which a container C such as a cup is placed, and a cover portion 22 that covers the upper side of the pedestal portion 21. The cradle 21 is formed in the shape of a drainboard so that the beverage overflowing from the container C such as a cup can flow downward.

As shown in FIGS. 2 and 3, the beverage supply unit 30 supplies the beverage to the container C placed on the mounting table 20, and is a raw material water composed of hot water (hot water) and / or cold water (water). It includes a beverage generation unit 31 that produces a beverage from the beverage raw material powder, and a beverage guide 35 that guides the beverage produced by the beverage generation unit 31 to the container C of the mounting table 20. The beverage generation unit 31 includes a beverage raw material container 32 for storing the raw material powder (powder raw material) of the beverage, a mixing container 33 for mixing the raw material powder of the beverage and the raw material water, and the raw material powder and the raw material water in the mixing container 33. It is provided with a stirring device 34 for stirring and mixing with.

The beverage raw material container 32 stores raw material powder for beverages made of powders such as tea and black tea, and is detachably attached to a base 15 provided in the beverage generation chamber 12. A raw material powder carry-out port 32a is provided at the bottom of the beverage raw material container 32, and the raw material powder is carried out from the carry-out port 32a to the mixing container 33. A screw 32b is provided in the lower portion of the beverage raw material container 32, and the drive of the motor 32d is transmitted to the screw 32b via the coupling member 32c. When the screw 32b is rotated by the rotation of the motor 32d, the raw material powder in the beverage raw material container 32 is carried out into the mixing container 33 from the carry-out port 32a.

As shown in FIG. 3, the mixing container 33 stirs and mixes the raw material powder and the raw material water composed of hot water (hot water) and / or cold water (water), and is a base provided in the beverage generation chamber 12. It is detachably supported by 15. The mixing container 33 is open on the lower side of the beverage raw material container 32, and the raw material powder carried out from the carry-out port 32a of the beverage raw material container 32 flows into the mixing container 33. A discharge port 33a is formed at the bottom of the mixing container 33, and the beverage mixed by being stirred in the mixing container 33 is discharged from the discharge port 33a to the beverage guide 35 provided on the lower side.

As shown in FIG. 4, the base 15 is provided with a raw material water supply port 15a for supplying raw material water composed of hot water (hot water) and / or cold water (water) in the mixing container 33. A raw material water supply unit 40, which will be described later, is connected to the raw material water supply port 15a, and the raw material water sent from the raw material water supply unit 40 is supplied to the mixing container 33 through the raw material water supply port 15a.

As shown in FIG. 3, a stirring device 34 is provided in the mixing container 33, and the stirring device 34 is provided by a stirring motor 34a provided on the base 15 on the rear side of the mixing container 33 and a stirring motor 34a. It includes a rotating rotating shaft 34d and a disk portion 34e provided at the tip of the rotating shaft 34d. A coupling magnet 34b is provided on the output shaft of the stirring motor 34a, and a coupling magnet 34c is provided at the base end of the rotating shaft 34d on the stirring motor 34a side. The rotating shaft 34d is detachably connected to the stirring motor 34a by the coupling magnets 34b and 34c, and the stirring motor 34a rotates the rotating shaft 34d via the coupling magnets 34b and 34c. The rotary shaft 34d extends above the discharge port 33a at the bottom of the mixing container 33, and a disk portion 34e is provided above the discharge port 33a at the tip of the rotary shaft 34d. A stirring blade 34f is provided on the lower surface of the disk portion 34e at the tip of the rotating shaft 34d, and the raw material powder and the raw material water in the mixing container 33 are stirred and mixed by the rotation of the disk portion 34e to form a beverage. ..

As shown in FIG. 2, the beverage guide 35 guides the beverage produced by the beverage generation unit 31 to the container C placed on the mounting table 20. The beverage guide 35 has a shallow box shape and is supported on the upper side of the cover portion 22 of the mounting table 20. The beverage guide 35 is provided with a cylindrical beverage dispensing portion 35a extending downward on the upper side of the central portion in the left-right direction at the front portion of the mounting table 20, and the beverage discharged from the mixing container 33 to the beverage guide 35. Is dispensed from the beverage dispensing section 35a into the container C of the mounting table 20.

As shown in FIG. 5, the raw material water supply unit 40 includes a hot water generator 50 that supplies hot water (hot water) and a cooling water tank 41 that supplies cold water (water). The hot water generator 50 is provided in a hot water tank 51 for heating water to generate hot water, a water level sensor 52 for detecting the water level in the hot water tank 51, and a hot water tank 51 provided below the hot water tank 51. A semi-solid heat conductive material 57 (which is interposed between the heater 54 for heating the water (hot water) and the hot water tank 51 and the heater 54 and has fluidity to transfer the heat of the heater 54 to the hot water tank 51. (Shown in FIG. 6).

The hot water tank 51 heats the stored water to generate hot water, and uses a metal container such as stainless steel. The hot water tank 51 has a cylindrical shape with an open upper surface, and a lid portion 51a is provided at the upper surface opening of the hot water tank 51 so as to be openable and closable. A drainage port 51b is formed at the radial center of the bottom wall of the hot water tank 51, and the bottom of the hot water tank 51 is a truncated cone that gently inclines toward the drainage port 51b at the center in the radial direction as it goes downward. It has the shape of a slope. Fastening bolts (fastening members) 51c consisting of four male screws are fixed to the lower surface of the bottom of the hot water tank 51 to fasten and fix the heater 54, and the four fastening bolts 51c surround the lower surface of the bottom of the hot water tank 51. They are arranged at equal intervals in the direction.

The water level sensor 52 detects the water level of hot water in the hot water tank 51, and in this embodiment, a float switch provided with a float 52b movably provided on the stem 52a is used. The first and second water supply valves 42a and 42b are opened and closed so that the hot water in the hot water tank 51 falls within a predetermined water level range defined as a sufficient amount of hot water stored based on the water level detected by the water level sensor 52. It is controlled. A temperature sensor 53 is provided on the stem 52a of the water level sensor 52, and the temperature sensor 53 detects the temperature of hot water in the hot water tank 51. The operation of the heater 54 is controlled so that the hot water in the hot water tank 51 has a predetermined temperature range of 90 ° C. ± 1.5 ° C. based on the temperature detected by the temperature sensor 53.

As shown in FIGS. 5 and 6, the heater 54 heats the water (hot water) in the hot water tank 51, and has an aluminum heater block 55 arranged under the hot water tank 51 and a heater. It includes a heater wire 56 arranged in the block 55. The heater block 55 heats the hot water tank 51 by generating heat from the heater wire 56 inside. The heater block 55 has a substantially ring shape in which a through hole 55a is formed in the central portion in the radial direction, and the drain pipe 44 of the hot water tank 51 is inserted through the through hole 55a. The upper surface of the heater block 55 is a heating surface 55b for heating the water (hot water) in the hot water tank 51, and the heating surface 55b on the upper surface of the heater block 55 advances downward in the same manner as the shape of the bottom of the hot water tank 51. It has the shape of a truncated cone that gently inclines toward the center in the radial direction.

As shown in FIGS. 6 and 7, a holding recess 55c for holding the semi-solid heat conductive material 57 having fluidity is formed on the heating surface 55b on the upper surface of the heater block 55. The holding recesses 55c have an annular groove shape extending in the circumferential direction of the heater block 55, and nine (s) are formed in the radial direction. The holding recess 55c arranged on the outer side in the radial direction has a deeper groove than the holding recess 55c in the central portion in the radial direction. The holding recess 55c arranged inside in the radial direction has a deeper groove than the holding recess 55c in the central portion in the radial direction.

As shown in FIGS. 6 and 7, the heater block 55 is formed with four mounting holes 55d formed by through holes for inserting the fastening bolts 51c of the hot water tank 51, and the four mounting holes 55d are heaters. The blocks 55 are arranged at equal intervals in the circumferential direction. The heater block 55 is detachably fastened to the bottom of the hot water tank 51 by screwing the fastening nut 55e into the fastening bolt 51c with the fastening bolt 51c of the hot water tank 51 inserted into the mounting hole 55d of the heater block 55. It is fixed.

Although the heater block 55 is fastened and fixed so as to be in close contact with the hot water tank 51 as much as possible, the heater block 55 cannot be brought into close contact with the hot water tank 51 over the entire surface due to processing accuracy or the like. Therefore, a semi-solid heat conductive material 57 is interposed between the hot water tank 51 and the heater block 55 so that the heat of the heater block 55 can be evenly transferred to the bottom of the hot water tank 51. .. The heat conductive material 57 has a fluidity so that the entire surface of the heating surface 55b of the heater block 55 is indirectly brought into close contact with the lower surface of the bottom wall of the hot water tank 51, and is a semi-solid silicone compound having high heat conductivity. Is used. The heat conductive material 57 has high thermal conductivity that easily transfers the heat of the heater 54 to the hot water tank 51, has an appropriate viscosity that is easily held by the heating surface 55b of the heater block 55, and covers the entire heating surface 55b. A paste-like semi-solid material (heat conductive paste) having fluidity is used so that it can be easily spread.

As shown in FIG. 5, a first water supply pipe 42 led out from a water supply source such as water is connected to the upper part of the hot water tank 51, and a hot water supply pipe 43 for sending hot water is connected to the lower part of the hot water tank 51. A drain pipe 44 for discharging water is connected to a drain port 51b at the bottom of the hot water tank 51. The first and second water supply valves 42a and 42b are interposed in the first water supply pipe 42, and the water of the water supply source is supplied to the hot water tank 51 by opening the first and second water supply valves 42a and 42b. NS.

A hot water pump 43a is interposed in the hot water supply pipe 43, and the hot water in the hot water tank 51 is sent to the hot water supply pipe 43 by the hot water supply pump 43a. Further, the hot water supply pipe 43 is interposed with the first to fourth raw material water supply valves 43b (43b1 to 43b4) for hot water, which are composed of three-way valves, and the first to fourth raw material water supply valves 43b for hot water are interposed. The first to fourth raw water supply pipes 43c (43c1 to 43c4) for hot water are connected to (43b1 to 43b4). The outlet end of the first raw material water supply pipe 43c1 is connected to the raw material water supply port 15a of the beverage supply unit 30 on the left side, and the outlet end of the second raw material water supply pipe 43c2 is the central beverage supply unit in the left-right direction. It is connected to the raw material water supply port 15a of 30, and the outlet end of the third raw material water supply pipe 43c3 is connected to the raw material water supply port 15a of the beverage supply unit 30 on the right side, and is connected to the raw material water supply port 15a of the beverage supply unit 30 on the right side. The lead-out end portion of the above is arranged on the cover portion 22 of the mounting table 20.

A drain valve 44a is interposed in the drain pipe 44, and the hot water in the hot water tank 51 is discharged to the outside through the drain pipe 44 by opening the drain valve 44a. Further, the drainage pipe 44 is connected to the outlet end of the hot water supply pipe 43 on the upstream side of the drainage valve 44a, and the hot water in the hot water tank 51 can be circulated through the hot water supply pipe 43. By periodically operating the hot water pump 43a for a certain period of time, hot water having a high temperature is always supplied from the hot water tank 51 into the hot water pipe 43, and the first to fourth raw material water supply pipes are supplied. The hot water supplied from 43c (43c1 to 43c4) is always hot water having a high temperature.

A second water supply pipe 45 constituting a raw material water supply path is connected to the first water supply pipe 42 immediately downstream of the first water supply valve 42a (between the first water supply valve 42a and the second water supply valve 42b). Water from a water supply source such as tap water is supplied to the cooling water tank 41 through a part of the first water supply pipe 42 and the second water supply pipe 45. Inside the cooling water tank 41, an evaporation pipe 41a of a refrigerating device for cooling the internal cooling water and a raw material water cooling pipe 41b for cooling the raw material water are provided. The cooling water in the cooling water tank 41 is cooled by the refrigerant circulating in the evaporation pipe 41a of the refrigerating apparatus, and the water of the water supply source is cooled by the cooling water when passing through the raw material water cooling pipe 41b to become the raw material water composed of cold water. ..

A water supply pipe 46 is connected to the raw material water cooling pipe 41b of the cooling water tank 41, and the raw material water composed of cold water cooled by the raw material water cooling pipe 41b is sent to the water supply pipe 46. The water pipe 46 is provided with first to third branch portions 46a to 46c for delivering cold water, and the first to third branch portions 46a to 46c and the tip portion 46d of the water pipe 46 are the fifth and fifth branches for cold water. The eighth raw material water supply valve 46e (46e1 to 46e4) is provided. The introduction ends of the 5th to 8th raw material water supply pipes 46f (46f1 to 46f4) for cold water are connected to the 5th to 8th raw material water supply valves 46e (46e1 to 46e4) for cold water, and are used for cold water. The lead-out end of the fifth to eighth source water supply pipes 46f (46f1 to 46f4) is connected to the intermediate portion of the first to fourth source water supply pipes 43c (43c1 to 43c4) for hot water.

The water of the water supply source is the first water supply pipe 42 by opening the first water supply valve 42a, the fifth source water supply valve 46e1 for cold water, the sixth source water supply valve 46e2, or the seventh source water supply valve 46e3. It is sent to the raw material water cooling pipe 41b of the cooling water tank 41 through a part of the water supply pipe 45 and the second water supply pipe 45 and cooled to become the raw material water composed of cold water. It is connected to the supply pipe 46f1, the sixth raw material water supply pipe 46f2 or the seventh raw material water supply pipe 46f3, and the first raw material water supply pipe 43c1 and the sixth raw material water supply pipe 46f2 connected to the fifth raw material water supply pipe 46f1. It is supplied into the mixing container 33 through the second raw material water supply pipe 43c2 or the third raw material water supply pipe 43c3 connected to the seventh raw material water supply pipe 46f3. Further, the water of the water supply source passes through a part of the first water supply pipe 42 and the second water supply pipe 45 by opening the first water supply valve 42a and the eighth raw material water supply valve 46e4 for cold water, and the cooling water tank. It is sent to the raw material water cooling pipe 41b of 41 and cooled to become the raw material water made of cold water, and the raw material water made of cold water is connected to the water supply pipe 46, the eighth raw material water supply pipe 46f4, and the eighth raw material water supply pipe 46f4. It is supplied to a container C such as a cup placed on the mounting table 20 through the fourth raw material water supply pipe 43c4.

As shown in FIG. 8, the beverage supply device 10 includes a control device 60 that controls the supply of beverages to the container C placed on the mounting table 20, and the control device 60 is an operation provided on the front panel 16. Switch 17, beverage raw material carry-out motor 32d, stirring motor 34a, first and second water supply valves 42a, 42b, hot water supply pump 43a, first to fourth raw material water supply valves 43b (43b1 to 43b4), fifth It is connected to the eighth raw material water supply valve 46e (46e1 to 46e4), the water level sensor 52, the temperature sensor 53, and the heater wire 56. The control device 60 has a beverage supply program, the first beverage supply program is a program for supplying a hot or cold beverage containing raw material powder for a beverage such as tea, and the second beverage supply program is hot water (hot water). Alternatively, it is a program that supplies beverages consisting of cold water.

The first beverage supply program for supplying hot or cold beverages containing raw material powders for beverages such as tea is based on the operation of the operation switch 17 with the first water supply valve 42a and the fifth raw material water supply valve 46e1 for cold water. Open / close control with the 5th or 7th raw material water supply valve 46e2, 46e3) and / or operation control of the hot water supply pump 43a and the 1st raw material water supply valve 43b1 (2nd or 3rd raw material water supply valve) for hot water. By controlling the opening and closing of 43b2, 43b3) and controlling the operation of the beverage raw material unloading motor 32d and the stirring motor 34a, the raw material for beverages such as tea is placed in the container C such as a cup placed on the mounting table 20. It is controlled to supply hot or cold beverages containing powder.

The second beverage supply program, which supplies beverages consisting of hot water (hot water) or cold water that does not contain raw material powder for beverages such as tea, is based on the operation of the operation switch 17 and has the first water supply valve 42a and the eighth for cold water. By controlling the opening and closing of the raw material water supply valve 46e4 and / or the operation of the hot water supply pump 43a and the opening and closing of the fourth raw material water supply valve 43b4 for hot water, the cup or the like placed on the mounting table 20 can be controlled. The container C is controlled to supply a beverage consisting of hot water (hot water) or cold water that does not contain raw material powder for beverages such as tea.

When the hot beverage is supplied by the beverage supply device 10, the hot water generated by the hot water generator 50 is supplied to the beverage supply unit 30 or directly to the container C. When the beverage supply device 10 is supplying the beverage or waiting for the supply of the beverage, the hot water in the hot water tank 51 is determined to be stored in a sufficient amount based on the detected water level of the water level sensor 52. The first and second water supply valves 42a and 42b are controlled to open and close so as to be within the range of the water level of 90 ° C. ± 1.5 ° C. as a predetermined temperature range based on the detection temperature of the temperature sensor 53. The power supply to the heater wire 56 is controlled.

When power is supplied to the heater wire 56 based on the temperature detected by the temperature sensor 53, the heat generated from the heater wire 56 is transmitted from the heating surface 55b of the heater block 55 to the bottom of the hot water tank 51 via the heat conductive material 57. The water in the hot water tank 51 is heated to become hot water (hot water). When the hot water tank 51 is heated by the heater 54, the bottom of the hot water tank 51 approaches the heater block 55 side due to thermal expansion, and the heat conductive material 57 is easily pushed out from the hot water tank 51 and the heater block 55.

Further, when hot water is sent out from the hot water tank 51, the hot water in the hot water tank 51 decreases, and when a predetermined water level requiring water supply is detected by the water level sensor 52, the first and second water supply valves 42a and 42b are opened. As a result, the water of the water supply source is supplied into the hot water tank 51 through the first water supply pipe 42. By supplying a large amount of hot beverage in a short time, a large amount of hot water in the hot water tank 51 was sent out at one time, and then when a large amount of water was supplied to the hot water tank 51 at one time, the heater 54 heated the hot beverage. The bottom of the hot water tank 51 may be rapidly cooled by the supplied water. In this case, the bottom of the hot water tank 51 contracts and separates from the heater block 55, and when the hot water tank 51 is reheated by the heater 54, the bottom of the hot water tank 51 approaches the heater block 55 side again due to thermal expansion. Will be done.

The heat conductive material 57 not only softens and easily flows by being continuously heated by the heater 54, but also flows out from the heating surface 55b of the heater block 55 due to repeated thermal expansion and contraction of the hot water tank 51. It will be easier. When the heat conductive material 57 flows out from the heating surface 55b of the heater block 55, a portion where the heating surface 55b of the heater block 55 cannot be brought into close contact with the bottom of the hot water tank 51 is generated, and the heat of the heater 54 is efficiently transferred to the hot water tank 51. It may not be communicated well.

As described above, the hot water generator 50 is provided with a hot water tank 51 for heating water to generate hot water and a lower side of the hot water tank 51, and the water in the hot water tank 51 is provided by the heating surface 55b on the upper surface. A semi-solid heat conduction that is interposed between the heater 54 having the heater block 55 for heating the heater 54 and the hot water tank 51 and the heater 54 and has fluidity to transfer the heat of the heater 54 to the hot water tank 51. It is provided with a material 57.

In the hot water generator 50, the semi-solid heat conductive material 57 interposed between the hot water tank 51 and the heater 54 is continuously heated and softened, and is heated by the hot water tank 51 that thermally expands. It is easy to be pushed out from the heating surface 55b of the block 55, and it is easy to flow out from the heating surface 55b of the heater block 55. In this hot water generator 50, since the heating surface 55b of the heater block 55 is provided with a holding recess 55c for holding the heat conductive material 57, the heat conductive material 57 is held on the heating surface 55b by the holding recess 55c. It is possible to prevent the heater block 55 from flowing out from the upper side of the heating surface 55b. As a result, even if the hot water generator 50 is used for a long period of time, the heat of the heater 54 can be reliably transferred to the hot water tank 51 via the heat conductive material 57.

In the hot water generator 50 of this embodiment, the holding recesses 55c extend in the circumferential direction and have a plurality of groove shapes arranged in the radial direction, so that a plurality of heat conductive materials 57 are arranged in the radial direction of the heater block 55. The groove-shaped holding recess 55c made it possible to prevent the heater block 55 from flowing out into the outer and inner through holes 55a in the radial direction.

In this case, a plurality of groove-shaped holding recesses 55c arranged in the radial direction are formed deeper than those arranged outside in the radial direction and those arranged in the central portion in the radial direction. In this case, the heat conductive material 57 can be further prevented from flowing out by the holding recess 55c formed deeply on the outer side in the radial direction of the heater block 55. In this embodiment, the holding recess 55c arranged on the outermost side in the radial direction is formed deeper than the one arranged in the central portion in the radial direction, but the present invention is not limited to this, and the holding recess 55c is formed as the outer side in the radial direction. For example, the one arranged at the second or third from the outside (about 1/3 of the whole within the radius and the outer range) may be formed deeper than the one at the center in the radial direction.

Further, the heater block 55 has the shape of a truncated cone that gently inclines toward the center in the radial direction as it advances downward, similar to the shape of the bottom of the hot water tank 51, and the center in the radial direction of the heater block 55. A through hole 55a is formed in the hole 55a. In this way, when the heater block 55 is inclined toward the radial central portion of the heater block 55, the heat conductive material 57 easily flows down toward the radial central portion of the heater block 55, and further, the through hole It is easy to flow out from 55a. On the other hand, a plurality of groove-shaped holding recesses 55c arranged in the radial direction of the heater block 55 are formed deeper than those arranged inside in the radial direction than those arranged in the central portion in the radial direction. .. As a result, the heat conductive material 57 can be prevented from flowing out from the through hole 55a formed in the central portion in the radial direction by the holding recess 55c formed deeply inside the heater block 55 in the radial direction. In this embodiment, the holding recess 55c arranged on the innermost side in the radial direction is formed deeper than the one arranged in the central portion in the radial direction, but the present invention is not limited to this, and the holding recess 55c is formed as the inner side in the radial direction. For example, the one arranged at the second or third from the inside (about 1/3 of the whole within the radius and the inner range) may be formed deeper than the one at the center in the radial direction.

In the hot water generator 50 of this embodiment, the heater 54 is fastened to the bottom of the hot water tank 51 at four points (plurality of fastening points) in the circumferential direction by fastening bolts (fastening members) 51c and fastening nuts (fastening members) 55e. It is fixed. In this case, as shown in FIG. 9, the holding recess 55c may be formed between the four fastening points in the circumferential direction. That is, a plurality of holding recesses 55c may be arranged in the radial direction as an arc shape extending in the circumferential direction between the fastening portions. The heater 54 is in close contact with the bottom of the hot water tank 51 at four fastening points in the circumferential direction fastened by the fastening bolt 51c and the fastening nut 55e, whereas the heater 54 is located between the four fastening points in the circumferential direction. It is harder to adhere than the four fastening points. Since the holding recess 55c is formed between the four fastening points in the circumferential direction of the heater block 55, the heater 54 is held by the holding recess 55c even in the portion between the four fastening points in the circumferential direction. The material 57 facilitates heat transfer to the hot water tank 51. As a result, the hot water tank 51 can be prevented from being locally overheated at the fastening point of the heater 54, and is heated evenly in the circumferential direction. The number of fastening points is not limited to four, and may be two or more. Further, the holding recess 55c has an arc shape extending in the circumferential direction, but is not limited to this, and may have various shapes such as a linear shape and a corrugated shape.

The holding recess 55c of the present embodiment has an inverted triangular shape in which the apex is at the bottom and the base is at the top in the direction orthogonal to the direction extending along the groove, but the shape is not limited to this. However, the cross-sectional shape may be a semicircular shape or a rectangular shape. Further, the holding recess 55c is not limited to a groove shape that extends in the circumferential direction and is arranged in a plurality of radial directions, and is not limited to a plurality of recesses having various shapes such as a circle and a rectangle when viewed from a plane. It may be the one that has been used.

The heater block 55 of this embodiment has a circular outer shape, but is not limited to this, and the outer shape may be a polygon such as a quadrangle or a hexagon. good. Further, the heater block 55 has a heating surface 55b inclined toward the central portion in the radial direction, but the present invention is not limited to this, and the heating surface 55b of the heater block 55 has a horizontal flat surface. It may be a thing. Also in these cases, the holding recess 55c extends in the circumferential direction and has a plurality of groove shapes arranged in the radial direction, and the one arranged outside and / or inside the holding recess 55c in the radial direction is the central portion in the radial direction. It is particularly preferred to form deeper than those placed in.

50 ... hot water generator, 51 ... hot water tank, 51c ... fastening member (fastening bolt), 54 ... heater, 55a ... through hole, 55b ... heating surface, 55c ... holding recess, 55e ... fastening member (fastening nut), 57 … Heat conductive material.

Claims (5)

A hot water tank for heating water to generate hot water,
A heater provided on the lower side of the hot water tank and heating the water in the hot water tank by the heating surface on the upper surface,
A hot water generator provided with a semi-solid heat conductive material having fluidity to transfer the heat of the heater to the hot water tank, which is interposed between the hot water tank and the heater.
A hot water generator characterized in that a holding recess for holding the heat conductive material is provided on the heating surface of the heater. In the hot water generator according to claim 1,
A hot water generator characterized in that the holding recesses extend in the circumferential direction and have a plurality of grooves arranged in the radial direction. In the hot water generator according to claim 2.
A hot water generator characterized in that a plurality of groove-shaped holding recesses arranged in the radial direction are formed deeper than those arranged in the central portion in the radial direction in those arranged outside in the radial direction. In the hot water generator according to claim 2 or 3.
The heater has a through hole formed in the center in the radial direction.
A hot water generator characterized in that a plurality of groove-shaped holding recesses arranged in the radial direction are formed deeper than those arranged inside in the radial direction than those arranged in the central portion in the radial direction. In the hot water generator according to any one of claims 1 to 4.
The heater is fastened and fixed to the bottom of the hot water tank by fastening members at a plurality of fastening points in the circumferential direction.
A hot water generator characterized in that the holding recess is formed between a plurality of fastening points in the circumferential direction.

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