KR101906020B1 - Thermal maintaining device of brewing water with group head preheating apparatus for espresso coffee machine - Google Patents

Abstract

The present invention relates to an extraction water temperature holding apparatus equipped with an espresso machine group head preheating apparatus, and more particularly, to an apparatus and method for maintaining an extracted water temperature holding apparatus in an espresso machine by preheating a group head using a plate- (Extracted water) supplied to a coffee basket coupled to a porter filter so that there is no abrupt temperature change of the extracted water. The present invention relates to an extracted water temperature holding device provided with an espresso machine group head preheating device.

Description

TECHNICAL FIELD [0001] The present invention relates to an extraction water temperature holding apparatus having a group head preheating device for an espresso machine,

The present invention relates to an extraction water temperature holding apparatus equipped with an espresso machine group head preheating apparatus, and more particularly, to an apparatus and method for maintaining an extracted water temperature holding apparatus in an espresso machine by preheating a group head using a plate- (Extracted water) supplied to a coffee basket coupled to a porter filter so that there is no abrupt temperature change of the extracted water. The present invention relates to an extracted water temperature holding device provided with an espresso machine group head preheating device.

A variety of machines have been made for extracting espresso, an authentic Italian coffee that drinks coffee from the Demitasse by pressing the beans with heated water. An espresso machine was invented in 1906, designed to draw about 30 milliliters of coffee in about 30 seconds at about 9 atmospheres of pressure and about 90 degrees in temperature. The beans need to be finely ground three times more than when using a drip type machine. Factors that determine the taste of espresso are the thickness and amount of the beans, the discharge pressure of water, the temperature of the pressurized water that presses the coffee powder put in the coffee basket, and the falling rate.

When the espresso coffee is pulled out, a creamy layer called crema is formed. This is because the oil contained in the coffee beans is foamed and floated over the surface, which contains the coffee aroma. Therefore, it is possible to know whether or not espresso is extracted well by the degree of crema. Such an espresso machine is provided with one or more brew group heads, each of which is configured to be coupled to a container containing a predetermined amount of coffee powder, for example a porcelain filter.

The espresso machine also includes a boiler for heating water and a pump for supplying pressurized hot water to the extraction group head by pressurizing hot water heated at a predetermined temperature in the boiler to a constant pressure. These espresso machines are priced according to the uniformity of the extracted coffee taste.

Therefore, it is very important to keep the temperature of the heated pressurized extraction water constant, which is the factor that determines the taste of espresso, and to supply it to the porter filter coupled to the extraction group head. Most of the espresso machines are structured such that the pressurized extracting water, which is heated in the boiler and discharged at a constant pressure, must inevitably come into contact with the extraction group head and the sour screen of the group head just before extracting the espresso.

In general espresso extract, the extraction temperature of coffee is 90 ~ 95 ℃. In order to keep the extracted water temperature at the above temperature before extracting, the extract group head made of metal and the shower screen combined with it are always heated to the proper temperature I had to preheat. When the temperature of the extraction group head of the espresso machine is much lower than the temperature of the pressurized hot water, the extraction temperature sharply drops and the amount of the crema is remarkably reduced and the taste and the fragrance are lowered.

Thus, in most espresso machines, a head preheating device is added to the extraction group head in which the temperature of the group head is preheated to a predetermined temperature. The preheating units of this extraction group head are predominantly using hot water heated in a boiler that heats the water inside the espresso machine. The first is to keep the group head at a constant temperature by circulating the heated water heated in the boiler through the group head by the theoreticalyphon method, Directly heating the group head separately from the circuit.

However, in the method of heating the group head by the hot water for extraction, since a large amount of coffee is produced and the temperature of the hot water for extraction is lowered or the temperature reaction of the surrounding environment is not performed immediately, The dissolved solids inside the boiler are gradually condensed and accumulated in the high-temperature boiler, so that a scale phenomenon occurs in which various kinds of chemical or physical actions are crystallized.

Scale refers to the impurities on the film surface attached to the metal surface, metal oxide, and is a bad conductor of heat with a thermal conductivity of 0.7 ~ 3㎉ / mh ˚ C, so that heat transfer from the heat source to the boiler water is inhibited when it is adhered, As well as causing energy loss (lowering the efficiency of the boiler), overheating of the heat transfer plate of the boiler leads to obstacles and corrosion due to the components of the scale also causes corrosion and causes the taste and aroma of the extracted coffee Thereby shortening the life of the coffee machine.

In order to solve the above problems, Patent No. 147069 (registered on Feb. 23, 2015) granted to the applicant has an "extraction group head preheating device for espresso machine". The prior art disclosed in the above patent document has a technical configuration for controlling the temperature of the group head by transferring the temperature of the heating unit, which is controlled at a preset temperature, to the extraction group head of the espresso machine through a heat pipe.

However, the above prior art can solve the problem that the temperature of the group head is drastically lowered by transferring the heat energy of the heating portion to the group head body as a pipe-shaped heat pipe manufactured in a specific shape and shape. However, The temperature of the entire surface of the body could not be uniformly controlled.

That is, when the temperature of the entire surface of the group head body is not uniform, and the extracted pressurized water conveyed from the pressurized hot water tank is introduced into the intake of the group head body, the pressurized water discharged from the pressurized water discharge port formed in the drain cavity of the group head body There is a problem that the taste of the coffee is not uniform when the coffee powder put in the coffee basket of the porter filter coupled to the group head body is pressurized.

10-1479069 B1 (2015.02 23. 23. REGISTRATION)

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an extraction of an espresso machine which keeps the group head heated and stable so that the temperature of the pressurized extraction water drained from the drain cavity of the group head becomes uniform, And a group head preheating device.

Another object of the present invention is to heat the entire upper surface of the drain cavity forming the extraction water conveyance path and the discharge port of the group head body by the plate or surface heating element heated by the supply of electric energy, And an extracting group head preheating device for an espresso machine which keeps the temperature uniform so that the dropping temperature of the coffee extracting water becomes uniform so that the coffee extraction is optimized.

It is still another object of the present invention to provide a method and apparatus for forming a drain cavity on the bottom surface of an extraction water conveying path of a group head body and a method of forming a drainage cavity for heat dissipation for diffusing extracted water collected in the drain cavity into a coffee basket of a porter filter A group head of an espresso coffee machine having a diffuser holder, and an extraction group head preheating device for efficiently heating the group head to maintain a constant temperature.

To achieve the above object, according to the present invention, there is provided an espresso machine comprising: a body having a downwardly opened drain cavity formed at a central portion thereof for transferring pressurized water supplied from a pressurized hot water tank in a main body of an espresso machine; A heating plate-like heating element which is tightly coupled to an upper surface of the body and uniformly heats the entire body; A diffuser holder installed at a lower portion of the body and having a diffuser for diffusing and discharging the extracted water filled in the drain cavity, the diffuser holder for accumulating heat energy of the heated body to prevent temperature drop of the extracted water collected in the drain cavity; And a diffusion disk block coupled to the lower portion of the diffuser holder and diffusing and discharging the extracted water diffused by the diffuser to the lower shower screen to maintain the temperature of the body while being heated by the heat energy accumulated in the diffuser holder .

The heat transfer sheet is mounted on the heating element and is fixed to the body in a state covered with the cover. And a thermoelectric pad disposed between the body and the heating element to uniformly transmit heat generated by the heating element to the upper surface of the body.

A temperature sensor installed at one side of the body for sensing a temperature; And a controller for controlling a supply amount of electric energy supplied to the electrodes of the heating element so that the temperature of the body sensed by the temperature sensor becomes a predetermined temperature.

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The group head of the espresso coffee machine according to the present invention is provided with a plate-shaped heating element having a sheet shape between a group head body made of a material having excellent thermal conductivity and a group head cover coupled to the group head body, The group head diffuser holder having the diffuser having the through holes formed at equal intervals and the diffusion disk block for making the temperature of the extraction water uniform are provided so that the temperature of the group head is made uniform and the temperature distribution of the extracted water is made constant, The taste can be improved.

1 is a perspective view of an espresso coffee machine according to a preferred embodiment of the present invention;
Fig. 2 is a plan view of the group head shown in Fig. 1
3 is a cross-sectional view taken along line DD of the group head shown in Fig.
4 is an exploded perspective view of the group head shown in Figs. 1 to 3. Fig.
FIG. 5 is a diagram illustrating a preheat temperature distribution diagram of a group head according to an embodiment of the present invention. FIG. 5 is a photograph taken with an infrared thermal camera. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. It should be understood, however, that the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be noted that the embodiments of the present invention described below are intended to sufficiently convey the spirit of the present invention to those skilled in the art.

Referring to FIG. 1, an espresso coffee machine 1 according to an embodiment of the present invention includes a main body 2 having a boiler, a pump, and the like installed therein for heating water to be discharged at a high temperature and pressure. That is, the main body 2 is provided with a pressurized hot water tank 21 for discharging the extracted water heated to a predetermined temperature in response to a coffee extracting signal at a constant pressure.

1 is an under counter type in which a main body 2 is placed under a work table for extracting coffee and a work plate 3 on which an espresso coffee shot cup is placed is provided on the upper surface, And a group head 5 is provided on the upper side of the base 3 through a support 4. The support table 4 simply supports the group head 5 on the upper surface of the main body 2. A pipe or the like connected between the pressurized hot water tank 21 of the main body 2 and the group head 5 It is built in.

In the case of an espresso coffee machine of an under counter type in the embodiment of the present invention, in the case of an ordinary espresso machine put on a table, the support stand 4 includes a main body 2 provided with a group head 5, The present invention can be applied to all of the espresso coffee machines having the group head 5.

The extracted water discharged at a constant pressure, for example, 9 atm, from the pressurized hot water tank of the main body 2 is discharged to the group head 5 coupled to the upper portion thereof through the internal extracted water transfer pipe of the support 4 . The group head (5) is combined with a potter filter (6) having a coffee basket containing ground coffee. Therefore, when the high-temperature extracting water from the main body 2 is discharged at a high pressure, this extracted water is supplied to the coffee basket of the porter filter 6 coupled to the group head 5, whereby the espresso coffee is extracted, And falls into the S-press shot cup placed on the upper side of the container 3.

The group head 5 of the espresso coffee machine 1 constructed as described above has a heating or preheating device for keeping the temperature homogeneous throughout the body, The temperature of the extracted water to be discharged is also uniformly discharged. The operation according to this will be described in detail with reference to Figs. 2 to 5. Fig.

The group head 5 according to the present invention includes a group head body 50 made of a metal material having excellent thermal conductivity. The group head body 50 has a drain cavity 51 opened in a plate shape at a central portion thereof and is supplied from a pressurized hot water tank 21 in the main body 2 of the espresso machine 1 The inlet 52 for inputting the pressurized water is interlocked with the drain cavity 51 through the transfer path 53. It can be seen that the group head body 50 configured as described above discharges the extracted water of high temperature flowing into the intake 52 to the drain cavity 51.

At this time, a plate-shaped heating element 54 having a sheet-like shape is formed on the upper surface of the group head body 50. The plate-shaped heating element 54 generates heat by the electric energy supplied to the electrode 55. Between the plate-like heat generating body 54 and the upper surface of the group head body 50, a thermoelectric pad 57 for spreading heat efficiently to the surface of the group head body 50 is provided. An insulating sheet 56 is laminated and covered with the head cover 58. [

A temperature sensor 70 is coupled to one side of the group head body 50. The temperature sensor 70 detects the temperature of the group head body 50 which is raised as heat energy due to the heat generated by the plate-like heat generating body 54 is uniformly transmitted to the upper surface of the group head body 50 through the thermoelectric pad 57 Detection. The output of the temperature sensor 70 is supplied to a controller (not shown) for controlling electrical energy supplied to the electrode 55 of the plate-like heat generating element 54.

The controller interrupts the electric energy supplied to the electrode 55 of the plate-like heating element 54 so that the temperature of the group head body 50 sensed by the temperature sensor 70 follows a predetermined preheating temperature. The temperature of the group head body 50 can be maintained at a constant temperature by controlling the controller operated in this manner.

A group head diffuser holder (not shown) having a diffuser 61 for dispersing or diffusing the extracted water so as to minimize the temperature change of the extracted water introduced at high temperature and high pressure is disposed on the outlet side of the drain cavity 51 of the group head body 50. [ ) 59 are coupled.

In the diffuser 61, at least two through-holes 60 for effectively dispersing or diffusing the extracted water are formed at equal intervals, preferably four to six. Therefore, the extracted water collected in the drain cavity 51 of the group head body 50 is effectively discharged to the lower part through the through-hole 60 of the diffuser 61. At this time, the group head diffuser holder 59 accumulates the thermal energy of the heated group head body 50, thereby preventing the temperature of the extracted water collected in the drain cavity 51 from dropping.

The heat energy accumulated in the group head diffuser holder 59 is transferred to the diffusion disk block 63 coupled to the lower portion thereof so that the group head body 50, the group head diffuser holder 59 and the diffusion disk block 63 Thermal energy is accumulated at almost the same temperature by the continuous heating control of the plate-like heat generating element 54, and the same temperature is maintained.

Diffusers 62 are formed at equal distances from the diffuser disk block 63 so as to have a larger number than the number of the through holes 60 formed in the diffuser 61. A shower screen 64, Is coupled to the diffusion disk block (63) by the screen bolt (65). It is also preferable that the diffusion disk block 63 is also made of a metal material having excellent thermal conductivity.

Below the group head diffuser holder 59 is coupled a port filter ring 66 to expose a shower screen 64 coupled to the diffuser disk block 63 in a central hollow and the porter filter ring 66 And the head cover 58 provided at the uppermost portion are fastened and tightly coupled by the coupling bolts 69.

Between the diffuser 61 of the group head diffuser holder 59 and the diffuser 61 of the group head diffuser holder 59 and the porcelain filter o-ring 68 between the drain cabinet 51 of the group head body 50 and the diffuser 61 of the group head diffuser holder 59, It is preferable that the O-ring 67 and the Porter filter O-ring 68 are combined so that the extracted water does not leak out, and there is no clearance at the time of coupling.

2 to 4, the plate-like heat generating body 54 is heated and the heat energy generated by the heat is applied to the thermoelectric pad 57 A group head diffuser holder 59 and a diffusion disk block 63 which are sequentially transferred to the lower portion of the group head body 50 and the heat energy which has been transferred to the entirety of the group head body 50, So that the entire group head 5 maintains a uniform temperature.

When the extracted water of high temperature and high pressure is inputted into the intake 52 of the group head 5 whose entire temperature is maintained at a uniform temperature, the group head body 50 having a uniform temperature distribution, the group head diffuser holder 59, As the coffee is spread through the block 63 and sprayed to the outside through the shower screen 64, the coffee baskets of the porter filter 6 of FIG. 1 are sprayed with the extracted water having a uniform temperature, .

FIG. 5 is a photograph showing a preheating temperature distribution diagram of a group head according to an embodiment of the present invention, in which a group head 5 made according to an embodiment is photographed with an infrared thermal imaging camera. In Fig. 5, the vertical side indicates degrees Celsius (占 폚) along the temperature axis. As a result of photographing with an infrared ray camera, it can be seen that all the remaining portions except for the portion of the head cover 58 where the transmission of heat energy is blocked by the insulating pad 56 are maintained at about 90.22 캜.

That is, it can be seen that the entire extraction group head 5 maintains the uniform temperature.

1: Espresso coffee machine 2: Body
21: Pressurized hot water tank 3: Working plate
4: support 5: group head
6: Porter filter 50: Group head body
51: drain cavity 52: intake
53: feed path 54: plate-shaped heating element
55: electrode 56: insulating sheet
57: thermoelectric pad 58: head cover
59: diffuser holder 60: through hole
61: diffuser 62: diffuser
63: diffusion disk block 64: shower screen
65: Screen bolt 66: Porter filtering
67: O-ring 68: Porter filter O-ring
69: coupling bolt 70: temperature sensor

Claims (4)

A body having a downwardly opened drain cavity formed at a central portion thereof for transferring pressurized water supplied from a pressurized hot water tank in the main body of the espresso machine;
A heating plate-like heating element which is tightly coupled to an upper surface of the body and uniformly heats the entire body;
A diffuser holder installed at a lower portion of the body and having a diffuser for diffusing and discharging the extracted water filled in the drain cavity, the diffuser holder for accumulating heat energy of the heated body to prevent temperature drop of the extracted water collected in the drain cavity; And
And a diffusion disk block coupled to the lower portion of the diffuser holder and diffusing and discharging the extracted water diffused by the diffuser to the lower shower screen to maintain the temperature of the body while being heated by the heat of the heat energy accumulated in the diffuser holder,
A heat transfer sheet which is installed on an upper portion of the heating element and is fixed to the body while being covered with the cover; And
And a thermoelectric pad disposed between the body and the heating element to uniformly transmit heat generated by the heating element to the upper surface of the body. delete delete The method according to claim 1,
A temperature sensor installed at one side of the body for sensing a temperature; And
And a controller for controlling an amount of electric energy supplied to the electrode of the heating element so that the temperature of the body sensed by the temperature sensor becomes a preset temperature. Water temperature holding device.

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