KR20140137881A - Device for pre-heating of brew group head in espresso machines - Google Patents

Abstract

Provided is a device for preheating an extract group head of an espresso machine preventing a dramatic temperature change of pressurized water supplied from a boiler when coffee is extracted by transmitting the heat of a heating unit controlled by heat pipes to be at a preset temperature in order to maintain the temperature of the extract group head within a preset temperature range. The device for preheating the extract group head of the espresso machine includes the extract group head having an inlet and an outlet as internal components and pressurizing heated extraction water sent through the inlet with a coffee basket of a porter filter joined to the lower part; a stored heat dispersing plate made of a plate-shaped metallic material on which an extraction hole interlocked with the inlet is formed, face-combined to the top surface of the extract group head, receiving a cartridge heater heated by an electricity supply, and accumulating thermal energy obtained by heating the cartridge heater by dispersing the thermal energy to the surface of the metallic material as the heat pipes are installed on the cartridge heater in the radial direction and a heat storing plate made of a plate-shaped metallic material with an internal flow passage in which the heated extraction water flows, face-combined on the top surface of the stored heat dispersing plate, accumulating the thermal energy transmitted from the stored heat dispersing plate, and discharging the extraction water sent to the flow passage.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an extraction group head preheating apparatus for an espresso machine,

The present invention relates to an extraction group head preheating apparatus for an espresso machine, and more particularly, to an extraction group head preheating apparatus for an extraction group head of an espresso machine, in which the temperature of a heating unit controlled to a preset temperature by a heat pipe is transmitted to an extraction group head of an espresso machine, Wherein the temperature of the group head is maintained at a temperature within a predetermined range so that there is no abrupt temperature change of the pressurized water supplied from the boiler during the extraction of the coffee.

A variety of machines have been made to extract espresso, an authentic Italian coffee that drinks coffee from Demitasse by pressing hot water. The espresso machine, invented in 1906, is 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. The factors that determine the taste of espresso are the thickness and volume of the bean, pressure and temperature, and falling speed. 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 so that each extraction group head contains a container, for example a porter filter, containing a defined amount of coffee powder. The espresso machine also includes a boiler for heating water and a pump for pressurizing hot water heated to a predetermined temperature in the boiler to a predetermined pressure to supply pressurized hot water to the extraction group head.

These espresso machines are priced according to the uniformity of the taste of the extracted coffee. 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.

Therefore, the majority of espresso machines are equipped with a head preheating device which preheats the extraction group heads. 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 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 when it is adhered, the heat transfer from the combustion gas to the boiler water is inhibited, In addition to causing fuel loss (lowering the efficiency of the boiler), overheating of the heating plate of the boiler leads to obstacles, and depending on the components of the scale, it is also corrosive, causing corrosion and causing the taste and aroma of the extracted coffee Thereby shortening the life of the coffee machine.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an espresso machine which preheats an extraction group head into which extracted water heated and pressurized by a boiler flows as heat generated from a heating body operated by power supply, And a preheating unit for the extracted group heads.

Another object of the present invention is to quickly heat the heat of a diffuser plate for heat storage for storing heat of a heating body to a group of extraction heads of metal through a heat pipe, And the temperature of the extraction group head is preheated constantly by controlling the heating temperature of the heating body in inverse proportion according to the change of the temperature of the extraction group head, thereby providing an extraction group head preheating apparatus for an espresso machine.

Another object of the present invention is to provide an espresso machine which preheats an extraction group head so that the temperature of the extraction group is not abruptly changed even when a small amount of coffee is extracted by the extraction water, And a preheating unit for the extracted group heads.

According to an aspect of the present invention, there is provided an extracting group for extracting coffee by pressurizing a warmed extract water flowing into the inlet with a coffee basket of a porter filter coupled to the bottom, A head; A preheating block integrally formed or threaded on top of the extraction group head and preheating the extraction group head by heat transferred to a side or top surface; A heat storage diffusion plate for accumulating and diffusing the heating energy of the cartridge heater installed therein as a metal material; And a heat pipe connected between the heat accumulation diffusion plate and the preheating block for rapidly transferring the heat energy stored in the preheating block to the preheating block.

A temperature sensor is installed in the preheating block and a controller for controlling electricity supplied to the cartridge heater is connected to the cartridge heater so that the sensed temperature value sensed by the temperature sensor follows a preset temperature value.

In accordance with another aspect of the present invention, there is provided an extraction group head preheating apparatus for a coffee machine, comprising: a pressurized coffee powder filled in a coffee basket of a porter filter, An extraction group head for extracting coffee; Wherein an extraction hole is formed in the form of a plate-shaped metal material face-coupled to the upper surface of the extraction group head, the extraction hole being interlocked with the inlet port, a cartridge heater heated by electric supply is seated, A heat storage diffuser plate having a plurality of heat pipes installed therein for diffusing and accumulating heat energy generated by heating of the cartridge heater on the surface of the metal material; A plate-shaped metallic material having a flow path through which warmed extracted water flows is face-combined with the upper part of the heat accumulating and diffusing plate to accumulate heat energy transferred from the heat accumulating and diffusing plate. The extracted water flowing into the flow path is heated And a heat storage plate for discharging the water to an inlet of the extraction plate head.

A heat pipe is seated on the heat storage diffuser plate in a cartridge groove in which a rod-shaped cartridge heater is seated and in a pipe groove formed radially in the vicinity of the cartridge groove so that the heat energy of the cartridge heater is transferred to a plate- .

A temperature sensor is installed on the heat storage plate and a controller for controlling electricity supplied to the cartridge heater is connected to the cartridge heater so that the sensed temperature value sensed by the temperature sensor follows a preset temperature value.

The temperature sensor preferably uses a thermocouple.

The extraction group head preheating apparatus of the coffee machine according to the embodiments of the present invention is configured such that the heat energy of the heat storage diffusing plate for accumulating the heat of the cartridge heater, By preheating, the taste and aroma of the espresso coffee which is changed according to the temperature change of the extraction water can be kept constant, and the coffee machine can be made high-quality.

Fig. 1 is a perspective view of a coffee machine having an extraction group head preheating apparatus according to a preferred embodiment of the present invention. Fig. 1a is a perspective view, Fig. 1b is a front view, and Fig. 1c is a side view.
2 is an exploded perspective view of an extraction group head preheater according to a first preferred embodiment of the present invention.
FIGS. 3A and 3B are a side view and a plan view of an extraction group head preheater according to a first preferred embodiment of the present invention;
FIG. 4 is a configuration diagram of an extraction group head preheating apparatus according to a second preferred embodiment of the present invention, wherein FIG. 4A is a perspective view and FIG. 4B is a bottom perspective view.
Figures 5A and 5B are side and planar views of the extraction group head preheater shown in Figure 4;
FIG. 6 is a diagram illustrating a configuration of a heat storage diffusion plate according to an embodiment of the present invention; 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.

The espresso machine 1 has an espresso machine, such as a boiler, a pressurizing pump, and a group extracting head, which are provided inside the espresso machine, as shown in a perspective view of FIG. 1A, a front view of FIG. 1B and a side view of FIG. 1C. In Fig. 1, reference numeral 10 denotes a machine body having a boiler, a steam generator, and the like, 12 a cup lathe, 13 a coasters, 14 a steam nozzle, 15 a porcelain filter having a coffee basket, Head housing. The operation of the espresso machine 1 configured as above is known by pressing a coffee extraction button (not shown) provided on the front panel, and the extracted water heated by the boiler is supplied to the inside of the head housing 16 Is supplied to the extraction group head installed in the main body. At this time, espresso is extracted from the porter filter 15 coupled to the extraction group head. The espresso extraction of the espresso machine (1) is the same as the general one. The difference from the conventional one is that the extracting group head preheating device 17 of the espresso machine according to the present invention is installed inside the head housing 16.

First Embodiment

2 to 4, an extraction group head preheater 17 of an espresso machine according to a first preferred embodiment of the present invention mainly includes an extraction group head 20, a heat pipe 30, a cartridge heater 42, And a heat accumulation diffusion plate 40 having a built-in heat accumulation diffusion plate 40 therein.

The extraction group head 20 has an inlet 23 and an outlet (not shown on the bottom) through which the extracted water flows as a metallic material. The extracted group of extracted water, which flows into the inlet 23, And pressurized by a coffee basket of the potter filter 15 spirally connected to the part 25 to extract the coffee. At this time, a metal material preheating block 22 for preheating the extraction group head by heat transferred to a side or an upper surface by heat is integrally formed or screwed to the upper portion of the extraction group head 20. On the side surface of the preheating block 22, concave heat transfer grooves 24 are formed. The heat transfer groove 24 is intended to increase the contact area when the pipe-shaped heat transfer element is coupled.

The heat storage and diffusion plate 40 is made of a metal material having excellent thermal conductivity, and a cartridge heater 42, which is heated by electric power supply and emits heat energy, is inserted, embedded, or attached to the heat storage diffusion plate 40. As an example of such a cartridge heater 42, a general one can be used. In the present invention, a model HLP-1000 manufactured by HLP in Korea was used. Since the heat accumulation diffuser plate 20 is made of aluminum, copper, or an alloy thereof having excellent thermal conductivity, when the cartridge heater 42 is heated by electric power supply, heat is accumulated and diffused to the entire metal plate. The temperature of the heat storage plate 40 can be heated to about 100 ° C. to 300 ° C. by driving the cartridge heater 42. It is preferable that the heating temperature of the cartridge heater 42 is about 93 ° C. if possible.

The heat dissipation grooves 43 formed on the bottom of the heat accumulation diffuser plate 40 and the heat transfer grooves 42 formed in the preheating block 22 are connected by a pair of heat pipes 32. When a liquid such as alcohol having a good thermal conductivity is put into a pipe of a reduced pressure and the one side is heated, the liquid flows into the other side of the pipe and the heat is radiated there, The heat block 22, which acts as a heat dissipating portion, is rapidly transferred to a temperature of 90 ° C.

At this time, a temperature sensor (TS) of a thermocouple is attached to the upper part of the preheating block 22 or the extraction group head 21. The temperature of the extraction group head 20 sensed by the temperature sensor TS is supplied to a control device (not shown) for controlling the amount of current supplied to the cartridge heater 42. The control device controls electricity supplied to the cartridge heater 42 so that the sensed temperature value of the temperature sensor TS follows a predetermined temperature value.

The extraction group head preheater 17 of the espresso machine according to the first embodiment is arranged so that the heat stored in the heat accumulation diffuser plate 40 for diffusing and accumulating heat energy generated in the cartridge heater 40 is separated by the heat pipe 32 And is heated by the extraction group head 20 so that the temperature of the extraction group head 20 is constantly preheated, so that it is suitable for an espresso machine 1 of small size and small capacity.

Second Embodiment

4A to 6, the extraction group head preheater 17 of the espresso machine according to the first preferred embodiment is characterized in that the extraction group head 20, the heat storage diffusion plate 40 and the heat storage plate 50 are integrally formed Respectively.

The extraction group head 20 presses the coffee powder 18 filled in the coffee basket 18 of the potter filter 15 connected to the extraction water inlet 23 into the extraction water inlet 23 as a metal material, . On the upper surface of the extraction group head 20, a heat storage diffuser plate 40 made of a plate-shaped metal material is coupled.

6, an extraction hole EX is formed in a central portion of the heat accumulation diffuser plate 40 so as to be in contact with the inlet 23, and a bar-shaped cartridge heater 42 is mounted on the surface of the extraction hole EX. The cartridge groove 48 is formed. A pipe groove 46 is formed adjacent to the cartridge groove 48 and on the left and right sides thereof, on which the heat pipes 32 are mounted.

Heat is generated when electricity is supplied to the cartridge heater 42 coupled to the cartridge groove 48 of the heat accumulation diffuser plate 40 having the above structure and the heat energy is accumulated in the heat accumulation diffuser plate 40 made of a metal plate, The accumulated heat energy is diffused into the metal plate by the plurality of heat pipes 30 seated in the pipe groove 46.

A heat storage plate 50 made of a plate-shaped metal material having therein a flow path 52 through which the extracted water flows is coupled to the upper surface of the heat accumulation diffusion plate 40. One side of the flow path 52 is coupled with a solenoid valve SV which is opened in response to an extraction signal and the other side is coupled to an upper portion of an extraction hole EX formed in the heat accumulation diffusion plate 40. At this time, the solenoid valve SV is opened and closed under the control of a control device (not shown), and supplies the extracted water flowing from the boiler to the inlet 23a to the flow path 52.

At this time, a temperature sensor (TS) such as a thermocouple is attached to the heat storage plate (50) or the extraction gob head (20). The sensed temperature of the heat accumulating plate 50 or the extraction group head 20 sensed by the temperature sensor TS is supplied to a controller (not shown) for controlling the amount of current supplied to the cartridge heater 42. The control device controls electricity supplied to the cartridge heater 42 so that the sensed temperature value of the temperature sensor TS follows a predetermined temperature value.

When the espresso machine 1 equipped with the extraction group head preheater 17 of the espresso machine configured as in the second embodiment is operated, the control of the controller causes the cartridge heater 42 to be heated to a temperature of about 93 캜 By this heating, heat having the same temperature is accumulated in the heat storage conversion plate 40 and the heat storage plate 50 as well. At this time, when the user presses the coffee extraction button of the espresso machine 1, the control device drives and releases the solenoid valve SV. By this operation, the extracted water, which is heated to a temperature of about 90 DEG C in the boiler and supplied at a pressure of about 9 bar by a pressurizing pump (not shown), flows through the flow path 52 of the heat storage plate 50, ) To the extraction group head (30).

Therefore, the coffee that is filled in the coffee basket 18 of the porter filter 15 by the pressurized extraction water is extracted as espresso and discharged to the lower portion thereof.

The extraction group head preheater 17 of the espresso machine according to the second embodiment is provided with a plurality of heat pipes 30 in the heat storage diffuser plate 40 for diffusing and accumulating heat energy generated in the cartridge heater 40 When the temperature of the extraction group head 20 is lowered by the espresso extraction due to the heat accumulation plate 50 in which the flow of the extraction water is formed on the upper part of the heat accumulation plate 50, It is possible to minimize the change in the temperature of the extraction group head 20 even if a large amount of espresso is extracted, which is suitable for a large size and a large capacity.

Reference numeral "H" which is not shown in the drawings according to the above embodiments is a hole, and when the extraction group head preheater 17 of the espresso machine is coupled to the machine body 10 and its head housing 16, Respectively.

1: espresso machine, 10: machine body, 12: cup rack, 13: cup holder, 14: steam nozzle, 15: porter filter, 16: head housing, 17: extraction group head preheating device, 18: And a heating unit for heating and cooling the heat exchanger to a predetermined temperature in the heating unit, wherein the heating unit comprises: The present invention relates to a solenoid valve having a solenoid valve and a solenoid valve for supplying a solenoid valve to the solenoid valve.

Claims (6)

An extraction group head preheating apparatus for an espresso machine, comprising: an inlet and an outlet for metallic material; a warmed extraction water introduced into the inlet is pressurized with a coffee basket of a potter filter connected to the bottom, A group head; A preheating block integrally formed or threaded on top of the extraction group head and preheating the extraction group head by heat transferred to a side or top surface; A heat storage diffusion plate for accumulating and diffusing the heating energy of the cartridge heater installed therein as a metal material; And a heat pipe connected between the heat accumulation diffusion plate and the preheating block to heat the heat stored in the preheating block to the preheating block at a high speed. [2] The apparatus according to claim 1, wherein a temperature sensor is installed in the preheating block, and a controller for controlling electricity supplied to the cartridge heater is connected to the cartridge heater so that the sensed temperature value sensed by the temperature sensor follows a preset temperature value The extraction group head preheating device of an espresso machine. An extraction group head preheating apparatus for a coffee machine, comprising: an extraction group head for extracting coffee by pressurizing a coffee powder filled in a coffee basket of a porter filter connected to an extraction water inlet to an extraction drinking milk inlet as a metal material; Wherein a plurality of heat pipes are radially provided from the cartridge heater so that the heaters are installed in the heaters, A heat storage diffusion plate for diffusing and accumulating heat energy generated by heating of the cartridge heater on the surface of the metal material; And a heat exchanger connected to the upper portion of the heat accumulating and diffusing plate for accumulating thermal energy to be transferred from the heat accumulating and diffusing plate and heating the extracted water flowing into the flow channel, And a heat storage plate for discharging the heat to the inlet port. The heat storage apparatus according to claim 3, wherein a heat pipe is seated on the heat storage diffusion plate in a cartridge groove in which a rod-shaped cartridge heater is seated and in a pipe groove radially formed adjacent to the cartridge groove, And the heat is accumulated and diffused. The extraction group head preheating apparatus of espresso machine according to claim 1, The cartridge heater according to claim 3 or 4, wherein a temperature sensor is provided on the heat storage plate, and the cartridge heater controls the electricity supplied to the cartridge heater so that the sensed temperature value sensed by the temperature sensor follows a preset temperature value Wherein the apparatus is connected to the extraction group head preheating apparatus of the espresso machine. The extraction group head preheating apparatus according to any one of claims 1 to 4, wherein the temperature sensor is a thermocouple.

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